| /* |
| * linux/fs/ext4/super.c |
| * |
| * Copyright (C) 1992, 1993, 1994, 1995 |
| * Remy Card (card@masi.ibp.fr) |
| * Laboratoire MASI - Institut Blaise Pascal |
| * Universite Pierre et Marie Curie (Paris VI) |
| * |
| * from |
| * |
| * linux/fs/minix/inode.c |
| * |
| * Copyright (C) 1991, 1992 Linus Torvalds |
| * |
| * Big-endian to little-endian byte-swapping/bitmaps by |
| * David S. Miller (davem@caip.rutgers.edu), 1995 |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/string.h> |
| #include <linux/fs.h> |
| #include <linux/time.h> |
| #include <linux/vmalloc.h> |
| #include <linux/slab.h> |
| #include <linux/init.h> |
| #include <linux/blkdev.h> |
| #include <linux/backing-dev.h> |
| #include <linux/parser.h> |
| #include <linux/buffer_head.h> |
| #include <linux/exportfs.h> |
| #include <linux/vfs.h> |
| #include <linux/random.h> |
| #include <linux/mount.h> |
| #include <linux/namei.h> |
| #include <linux/quotaops.h> |
| #include <linux/seq_file.h> |
| #include <linux/ctype.h> |
| #include <linux/log2.h> |
| #include <linux/crc16.h> |
| #include <linux/cleancache.h> |
| #include <asm/uaccess.h> |
| |
| #include <linux/kthread.h> |
| #include <linux/freezer.h> |
| |
| #include "ext4.h" |
| #include "ext4_extents.h" /* Needed for trace points definition */ |
| #include "ext4_jbd2.h" |
| #include "xattr.h" |
| #include "acl.h" |
| #include "mballoc.h" |
| |
| #define CREATE_TRACE_POINTS |
| #include <trace/events/ext4.h> |
| |
| static struct ext4_lazy_init *ext4_li_info; |
| static struct mutex ext4_li_mtx; |
| static struct ratelimit_state ext4_mount_msg_ratelimit; |
| |
| static int ext4_load_journal(struct super_block *, struct ext4_super_block *, |
| unsigned long journal_devnum); |
| static int ext4_show_options(struct seq_file *seq, struct dentry *root); |
| static int ext4_commit_super(struct super_block *sb, int sync); |
| static void ext4_mark_recovery_complete(struct super_block *sb, |
| struct ext4_super_block *es); |
| static void ext4_clear_journal_err(struct super_block *sb, |
| struct ext4_super_block *es); |
| static int ext4_sync_fs(struct super_block *sb, int wait); |
| static int ext4_remount(struct super_block *sb, int *flags, char *data); |
| static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf); |
| static int ext4_unfreeze(struct super_block *sb); |
| static int ext4_freeze(struct super_block *sb); |
| static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags, |
| const char *dev_name, void *data); |
| static inline int ext2_feature_set_ok(struct super_block *sb); |
| static inline int ext3_feature_set_ok(struct super_block *sb); |
| static int ext4_feature_set_ok(struct super_block *sb, int readonly); |
| static void ext4_destroy_lazyinit_thread(void); |
| static void ext4_unregister_li_request(struct super_block *sb); |
| static void ext4_clear_request_list(void); |
| |
| /* |
| * Lock ordering |
| * |
| * Note the difference between i_mmap_sem (EXT4_I(inode)->i_mmap_sem) and |
| * i_mmap_rwsem (inode->i_mmap_rwsem)! |
| * |
| * page fault path: |
| * mmap_sem -> sb_start_pagefault -> i_mmap_sem (r) -> transaction start -> |
| * page lock -> i_data_sem (rw) |
| * |
| * buffered write path: |
| * sb_start_write -> i_mutex -> mmap_sem |
| * sb_start_write -> i_mutex -> transaction start -> page lock -> |
| * i_data_sem (rw) |
| * |
| * truncate: |
| * sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (w) -> i_mmap_sem (w) -> |
| * i_mmap_rwsem (w) -> page lock |
| * sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (w) -> i_mmap_sem (w) -> |
| * transaction start -> i_data_sem (rw) |
| * |
| * direct IO: |
| * sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (r) -> mmap_sem |
| * sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (r) -> |
| * transaction start -> i_data_sem (rw) |
| * |
| * writepages: |
| * transaction start -> page lock(s) -> i_data_sem (rw) |
| */ |
| |
| #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2) |
| static struct file_system_type ext2_fs_type = { |
| .owner = THIS_MODULE, |
| .name = "ext2", |
| .mount = ext4_mount, |
| .kill_sb = kill_block_super, |
| .fs_flags = FS_REQUIRES_DEV, |
| }; |
| MODULE_ALIAS_FS("ext2"); |
| MODULE_ALIAS("ext2"); |
| #define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type) |
| #else |
| #define IS_EXT2_SB(sb) (0) |
| #endif |
| |
| |
| static struct file_system_type ext3_fs_type = { |
| .owner = THIS_MODULE, |
| .name = "ext3", |
| .mount = ext4_mount, |
| .kill_sb = kill_block_super, |
| .fs_flags = FS_REQUIRES_DEV, |
| }; |
| MODULE_ALIAS_FS("ext3"); |
| MODULE_ALIAS("ext3"); |
| #define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type) |
| |
| static int ext4_verify_csum_type(struct super_block *sb, |
| struct ext4_super_block *es) |
| { |
| if (!ext4_has_feature_metadata_csum(sb)) |
| return 1; |
| |
| return es->s_checksum_type == EXT4_CRC32C_CHKSUM; |
| } |
| |
| static __le32 ext4_superblock_csum(struct super_block *sb, |
| struct ext4_super_block *es) |
| { |
| struct ext4_sb_info *sbi = EXT4_SB(sb); |
| int offset = offsetof(struct ext4_super_block, s_checksum); |
| __u32 csum; |
| |
| csum = ext4_chksum(sbi, ~0, (char *)es, offset); |
| |
| return cpu_to_le32(csum); |
| } |
| |
| static int ext4_superblock_csum_verify(struct super_block *sb, |
| struct ext4_super_block *es) |
| { |
| if (!ext4_has_metadata_csum(sb)) |
| return 1; |
| |
| return es->s_checksum == ext4_superblock_csum(sb, es); |
| } |
| |
| void ext4_superblock_csum_set(struct super_block *sb) |
| { |
| struct ext4_super_block *es = EXT4_SB(sb)->s_es; |
| |
| if (!ext4_has_metadata_csum(sb)) |
| return; |
| |
| es->s_checksum = ext4_superblock_csum(sb, es); |
| } |
| |
| void *ext4_kvmalloc(size_t size, gfp_t flags) |
| { |
| void *ret; |
| |
| ret = kmalloc(size, flags | __GFP_NOWARN); |
| if (!ret) |
| ret = __vmalloc(size, flags, PAGE_KERNEL); |
| return ret; |
| } |
| |
| void *ext4_kvzalloc(size_t size, gfp_t flags) |
| { |
| void *ret; |
| |
| ret = kzalloc(size, flags | __GFP_NOWARN); |
| if (!ret) |
| ret = __vmalloc(size, flags | __GFP_ZERO, PAGE_KERNEL); |
| return ret; |
| } |
| |
| ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, |
| struct ext4_group_desc *bg) |
| { |
| return le32_to_cpu(bg->bg_block_bitmap_lo) | |
| (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? |
| (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0); |
| } |
| |
| ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, |
| struct ext4_group_desc *bg) |
| { |
| return le32_to_cpu(bg->bg_inode_bitmap_lo) | |
| (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? |
| (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0); |
| } |
| |
| ext4_fsblk_t ext4_inode_table(struct super_block *sb, |
| struct ext4_group_desc *bg) |
| { |
| return le32_to_cpu(bg->bg_inode_table_lo) | |
| (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? |
| (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0); |
| } |
| |
| __u32 ext4_free_group_clusters(struct super_block *sb, |
| struct ext4_group_desc *bg) |
| { |
| return le16_to_cpu(bg->bg_free_blocks_count_lo) | |
| (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? |
| (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0); |
| } |
| |
| __u32 ext4_free_inodes_count(struct super_block *sb, |
| struct ext4_group_desc *bg) |
| { |
| return le16_to_cpu(bg->bg_free_inodes_count_lo) | |
| (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? |
| (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0); |
| } |
| |
| __u32 ext4_used_dirs_count(struct super_block *sb, |
| struct ext4_group_desc *bg) |
| { |
| return le16_to_cpu(bg->bg_used_dirs_count_lo) | |
| (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? |
| (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0); |
| } |
| |
| __u32 ext4_itable_unused_count(struct super_block *sb, |
| struct ext4_group_desc *bg) |
| { |
| return le16_to_cpu(bg->bg_itable_unused_lo) | |
| (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? |
| (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0); |
| } |
| |
| void ext4_block_bitmap_set(struct super_block *sb, |
| struct ext4_group_desc *bg, ext4_fsblk_t blk) |
| { |
| bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk); |
| if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) |
| bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32); |
| } |
| |
| void ext4_inode_bitmap_set(struct super_block *sb, |
| struct ext4_group_desc *bg, ext4_fsblk_t blk) |
| { |
| bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk); |
| if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) |
| bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32); |
| } |
| |
| void ext4_inode_table_set(struct super_block *sb, |
| struct ext4_group_desc *bg, ext4_fsblk_t blk) |
| { |
| bg->bg_inode_table_lo = cpu_to_le32((u32)blk); |
| if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) |
| bg->bg_inode_table_hi = cpu_to_le32(blk >> 32); |
| } |
| |
| void ext4_free_group_clusters_set(struct super_block *sb, |
| struct ext4_group_desc *bg, __u32 count) |
| { |
| bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count); |
| if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) |
| bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16); |
| } |
| |
| void ext4_free_inodes_set(struct super_block *sb, |
| struct ext4_group_desc *bg, __u32 count) |
| { |
| bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count); |
| if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) |
| bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16); |
| } |
| |
| void ext4_used_dirs_set(struct super_block *sb, |
| struct ext4_group_desc *bg, __u32 count) |
| { |
| bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count); |
| if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) |
| bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16); |
| } |
| |
| void ext4_itable_unused_set(struct super_block *sb, |
| struct ext4_group_desc *bg, __u32 count) |
| { |
| bg->bg_itable_unused_lo = cpu_to_le16((__u16)count); |
| if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) |
| bg->bg_itable_unused_hi = cpu_to_le16(count >> 16); |
| } |
| |
| |
| static void __save_error_info(struct super_block *sb, const char *func, |
| unsigned int line) |
| { |
| struct ext4_super_block *es = EXT4_SB(sb)->s_es; |
| |
| EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; |
| if (bdev_read_only(sb->s_bdev)) |
| return; |
| es->s_state |= cpu_to_le16(EXT4_ERROR_FS); |
| es->s_last_error_time = cpu_to_le32(get_seconds()); |
| strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func)); |
| es->s_last_error_line = cpu_to_le32(line); |
| if (!es->s_first_error_time) { |
| es->s_first_error_time = es->s_last_error_time; |
| strncpy(es->s_first_error_func, func, |
| sizeof(es->s_first_error_func)); |
| es->s_first_error_line = cpu_to_le32(line); |
| es->s_first_error_ino = es->s_last_error_ino; |
| es->s_first_error_block = es->s_last_error_block; |
| } |
| /* |
| * Start the daily error reporting function if it hasn't been |
| * started already |
| */ |
| if (!es->s_error_count) |
| mod_timer(&EXT4_SB(sb)->s_err_report, jiffies + 24*60*60*HZ); |
| le32_add_cpu(&es->s_error_count, 1); |
| } |
| |
| static void save_error_info(struct super_block *sb, const char *func, |
| unsigned int line) |
| { |
| __save_error_info(sb, func, line); |
| ext4_commit_super(sb, 1); |
| } |
| |
| /* |
| * The del_gendisk() function uninitializes the disk-specific data |
| * structures, including the bdi structure, without telling anyone |
| * else. Once this happens, any attempt to call mark_buffer_dirty() |
| * (for example, by ext4_commit_super), will cause a kernel OOPS. |
| * This is a kludge to prevent these oops until we can put in a proper |
| * hook in del_gendisk() to inform the VFS and file system layers. |
| */ |
| static int block_device_ejected(struct super_block *sb) |
| { |
| struct inode *bd_inode = sb->s_bdev->bd_inode; |
| struct backing_dev_info *bdi = inode_to_bdi(bd_inode); |
| |
| return bdi->dev == NULL; |
| } |
| |
| static void ext4_journal_commit_callback(journal_t *journal, transaction_t *txn) |
| { |
| struct super_block *sb = journal->j_private; |
| struct ext4_sb_info *sbi = EXT4_SB(sb); |
| int error = is_journal_aborted(journal); |
| struct ext4_journal_cb_entry *jce; |
| |
| BUG_ON(txn->t_state == T_FINISHED); |
| spin_lock(&sbi->s_md_lock); |
| while (!list_empty(&txn->t_private_list)) { |
| jce = list_entry(txn->t_private_list.next, |
| struct ext4_journal_cb_entry, jce_list); |
| list_del_init(&jce->jce_list); |
| spin_unlock(&sbi->s_md_lock); |
| jce->jce_func(sb, jce, error); |
| spin_lock(&sbi->s_md_lock); |
| } |
| spin_unlock(&sbi->s_md_lock); |
| } |
| |
| /* Deal with the reporting of failure conditions on a filesystem such as |
| * inconsistencies detected or read IO failures. |
| * |
| * On ext2, we can store the error state of the filesystem in the |
| * superblock. That is not possible on ext4, because we may have other |
| * write ordering constraints on the superblock which prevent us from |
| * writing it out straight away; and given that the journal is about to |
| * be aborted, we can't rely on the current, or future, transactions to |
| * write out the superblock safely. |
| * |
| * We'll just use the jbd2_journal_abort() error code to record an error in |
| * the journal instead. On recovery, the journal will complain about |
| * that error until we've noted it down and cleared it. |
| */ |
| |
| static void ext4_handle_error(struct super_block *sb) |
| { |
| if (sb->s_flags & MS_RDONLY) |
| return; |
| |
| if (!test_opt(sb, ERRORS_CONT)) { |
| journal_t *journal = EXT4_SB(sb)->s_journal; |
| |
| EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED; |
| if (journal) |
| jbd2_journal_abort(journal, -EIO); |
| } |
| if (test_opt(sb, ERRORS_RO)) { |
| ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only"); |
| /* |
| * Make sure updated value of ->s_mount_flags will be visible |
| * before ->s_flags update |
| */ |
| smp_wmb(); |
| sb->s_flags |= MS_RDONLY; |
| } |
| if (test_opt(sb, ERRORS_PANIC)) { |
| if (EXT4_SB(sb)->s_journal && |
| !(EXT4_SB(sb)->s_journal->j_flags & JBD2_REC_ERR)) |
| return; |
| panic("EXT4-fs (device %s): panic forced after error\n", |
| sb->s_id); |
| } |
| } |
| |
| #define ext4_error_ratelimit(sb) \ |
| ___ratelimit(&(EXT4_SB(sb)->s_err_ratelimit_state), \ |
| "EXT4-fs error") |
| |
| void __ext4_error(struct super_block *sb, const char *function, |
| unsigned int line, const char *fmt, ...) |
| { |
| struct va_format vaf; |
| va_list args; |
| |
| if (ext4_error_ratelimit(sb)) { |
| va_start(args, fmt); |
| vaf.fmt = fmt; |
| vaf.va = &args; |
| printk(KERN_CRIT |
| "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n", |
| sb->s_id, function, line, current->comm, &vaf); |
| va_end(args); |
| } |
| save_error_info(sb, function, line); |
| ext4_handle_error(sb); |
| } |
| |
| void __ext4_error_inode(struct inode *inode, const char *function, |
| unsigned int line, ext4_fsblk_t block, |
| const char *fmt, ...) |
| { |
| va_list args; |
| struct va_format vaf; |
| struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es; |
| |
| es->s_last_error_ino = cpu_to_le32(inode->i_ino); |
| es->s_last_error_block = cpu_to_le64(block); |
| if (ext4_error_ratelimit(inode->i_sb)) { |
| va_start(args, fmt); |
| vaf.fmt = fmt; |
| vaf.va = &args; |
| if (block) |
| printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: " |
| "inode #%lu: block %llu: comm %s: %pV\n", |
| inode->i_sb->s_id, function, line, inode->i_ino, |
| block, current->comm, &vaf); |
| else |
| printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: " |
| "inode #%lu: comm %s: %pV\n", |
| inode->i_sb->s_id, function, line, inode->i_ino, |
| current->comm, &vaf); |
| va_end(args); |
| } |
| save_error_info(inode->i_sb, function, line); |
| ext4_handle_error(inode->i_sb); |
| } |
| |
| void __ext4_error_file(struct file *file, const char *function, |
| unsigned int line, ext4_fsblk_t block, |
| const char *fmt, ...) |
| { |
| va_list args; |
| struct va_format vaf; |
| struct ext4_super_block *es; |
| struct inode *inode = file_inode(file); |
| char pathname[80], *path; |
| |
| es = EXT4_SB(inode->i_sb)->s_es; |
| es->s_last_error_ino = cpu_to_le32(inode->i_ino); |
| if (ext4_error_ratelimit(inode->i_sb)) { |
| path = file_path(file, pathname, sizeof(pathname)); |
| if (IS_ERR(path)) |
| path = "(unknown)"; |
| va_start(args, fmt); |
| vaf.fmt = fmt; |
| vaf.va = &args; |
| if (block) |
| printk(KERN_CRIT |
| "EXT4-fs error (device %s): %s:%d: inode #%lu: " |
| "block %llu: comm %s: path %s: %pV\n", |
| inode->i_sb->s_id, function, line, inode->i_ino, |
| block, current->comm, path, &vaf); |
| else |
| printk(KERN_CRIT |
| "EXT4-fs error (device %s): %s:%d: inode #%lu: " |
| "comm %s: path %s: %pV\n", |
| inode->i_sb->s_id, function, line, inode->i_ino, |
| current->comm, path, &vaf); |
| va_end(args); |
| } |
| save_error_info(inode->i_sb, function, line); |
| ext4_handle_error(inode->i_sb); |
| } |
| |
| const char *ext4_decode_error(struct super_block *sb, int errno, |
| char nbuf[16]) |
| { |
| char *errstr = NULL; |
| |
| switch (errno) { |
| case -EFSCORRUPTED: |
| errstr = "Corrupt filesystem"; |
| break; |
| case -EFSBADCRC: |
| errstr = "Filesystem failed CRC"; |
| break; |
| case -EIO: |
| errstr = "IO failure"; |
| break; |
| case -ENOMEM: |
| errstr = "Out of memory"; |
| break; |
| case -EROFS: |
| if (!sb || (EXT4_SB(sb)->s_journal && |
| EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT)) |
| errstr = "Journal has aborted"; |
| else |
| errstr = "Readonly filesystem"; |
| break; |
| default: |
| /* If the caller passed in an extra buffer for unknown |
| * errors, textualise them now. Else we just return |
| * NULL. */ |
| if (nbuf) { |
| /* Check for truncated error codes... */ |
| if (snprintf(nbuf, 16, "error %d", -errno) >= 0) |
| errstr = nbuf; |
| } |
| break; |
| } |
| |
| return errstr; |
| } |
| |
| /* __ext4_std_error decodes expected errors from journaling functions |
| * automatically and invokes the appropriate error response. */ |
| |
| void __ext4_std_error(struct super_block *sb, const char *function, |
| unsigned int line, int errno) |
| { |
| char nbuf[16]; |
| const char *errstr; |
| |
| /* Special case: if the error is EROFS, and we're not already |
| * inside a transaction, then there's really no point in logging |
| * an error. */ |
| if (errno == -EROFS && journal_current_handle() == NULL && |
| (sb->s_flags & MS_RDONLY)) |
| return; |
| |
| if (ext4_error_ratelimit(sb)) { |
| errstr = ext4_decode_error(sb, errno, nbuf); |
| printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n", |
| sb->s_id, function, line, errstr); |
| } |
| |
| save_error_info(sb, function, line); |
| ext4_handle_error(sb); |
| } |
| |
| /* |
| * ext4_abort is a much stronger failure handler than ext4_error. The |
| * abort function may be used to deal with unrecoverable failures such |
| * as journal IO errors or ENOMEM at a critical moment in log management. |
| * |
| * We unconditionally force the filesystem into an ABORT|READONLY state, |
| * unless the error response on the fs has been set to panic in which |
| * case we take the easy way out and panic immediately. |
| */ |
| |
| void __ext4_abort(struct super_block *sb, const char *function, |
| unsigned int line, const char *fmt, ...) |
| { |
| va_list args; |
| |
| save_error_info(sb, function, line); |
| va_start(args, fmt); |
| printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: ", sb->s_id, |
| function, line); |
| vprintk(fmt, args); |
| printk("\n"); |
| va_end(args); |
| |
| if ((sb->s_flags & MS_RDONLY) == 0) { |
| ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only"); |
| EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED; |
| /* |
| * Make sure updated value of ->s_mount_flags will be visible |
| * before ->s_flags update |
| */ |
| smp_wmb(); |
| sb->s_flags |= MS_RDONLY; |
| if (EXT4_SB(sb)->s_journal) |
| jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO); |
| save_error_info(sb, function, line); |
| } |
| if (test_opt(sb, ERRORS_PANIC)) { |
| if (EXT4_SB(sb)->s_journal && |
| !(EXT4_SB(sb)->s_journal->j_flags & JBD2_REC_ERR)) |
| return; |
| panic("EXT4-fs panic from previous error\n"); |
| } |
| } |
| |
| void __ext4_msg(struct super_block *sb, |
| const char *prefix, const char *fmt, ...) |
| { |
| struct va_format vaf; |
| va_list args; |
| |
| if (!___ratelimit(&(EXT4_SB(sb)->s_msg_ratelimit_state), "EXT4-fs")) |
| return; |
| |
| va_start(args, fmt); |
| vaf.fmt = fmt; |
| vaf.va = &args; |
| printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf); |
| va_end(args); |
| } |
| |
| #define ext4_warning_ratelimit(sb) \ |
| ___ratelimit(&(EXT4_SB(sb)->s_warning_ratelimit_state), \ |
| "EXT4-fs warning") |
| |
| void __ext4_warning(struct super_block *sb, const char *function, |
| unsigned int line, const char *fmt, ...) |
| { |
| struct va_format vaf; |
| va_list args; |
| |
| if (!ext4_warning_ratelimit(sb)) |
| return; |
| |
| va_start(args, fmt); |
| vaf.fmt = fmt; |
| vaf.va = &args; |
| printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n", |
| sb->s_id, function, line, &vaf); |
| va_end(args); |
| } |
| |
| void __ext4_warning_inode(const struct inode *inode, const char *function, |
| unsigned int line, const char *fmt, ...) |
| { |
| struct va_format vaf; |
| va_list args; |
| |
| if (!ext4_warning_ratelimit(inode->i_sb)) |
| return; |
| |
| va_start(args, fmt); |
| vaf.fmt = fmt; |
| vaf.va = &args; |
| printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: " |
| "inode #%lu: comm %s: %pV\n", inode->i_sb->s_id, |
| function, line, inode->i_ino, current->comm, &vaf); |
| va_end(args); |
| } |
| |
| void __ext4_grp_locked_error(const char *function, unsigned int line, |
| struct super_block *sb, ext4_group_t grp, |
| unsigned long ino, ext4_fsblk_t block, |
| const char *fmt, ...) |
| __releases(bitlock) |
| __acquires(bitlock) |
| { |
| struct va_format vaf; |
| va_list args; |
| struct ext4_super_block *es = EXT4_SB(sb)->s_es; |
| |
| es->s_last_error_ino = cpu_to_le32(ino); |
| es->s_last_error_block = cpu_to_le64(block); |
| __save_error_info(sb, function, line); |
| |
| if (ext4_error_ratelimit(sb)) { |
| va_start(args, fmt); |
| vaf.fmt = fmt; |
| vaf.va = &args; |
| printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ", |
| sb->s_id, function, line, grp); |
| if (ino) |
| printk(KERN_CONT "inode %lu: ", ino); |
| if (block) |
| printk(KERN_CONT "block %llu:", |
| (unsigned long long) block); |
| printk(KERN_CONT "%pV\n", &vaf); |
| va_end(args); |
| } |
| |
| if (test_opt(sb, ERRORS_CONT)) { |
| ext4_commit_super(sb, 0); |
| return; |
| } |
| |
| ext4_unlock_group(sb, grp); |
| ext4_handle_error(sb); |
| /* |
| * We only get here in the ERRORS_RO case; relocking the group |
| * may be dangerous, but nothing bad will happen since the |
| * filesystem will have already been marked read/only and the |
| * journal has been aborted. We return 1 as a hint to callers |
| * who might what to use the return value from |
| * ext4_grp_locked_error() to distinguish between the |
| * ERRORS_CONT and ERRORS_RO case, and perhaps return more |
| * aggressively from the ext4 function in question, with a |
| * more appropriate error code. |
| */ |
| ext4_lock_group(sb, grp); |
| return; |
| } |
| |
| void ext4_update_dynamic_rev(struct super_block *sb) |
| { |
| struct ext4_super_block *es = EXT4_SB(sb)->s_es; |
| |
| if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV) |
| return; |
| |
| ext4_warning(sb, |
| "updating to rev %d because of new feature flag, " |
| "running e2fsck is recommended", |
| EXT4_DYNAMIC_REV); |
| |
| es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO); |
| es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE); |
| es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV); |
| /* leave es->s_feature_*compat flags alone */ |
| /* es->s_uuid will be set by e2fsck if empty */ |
| |
| /* |
| * The rest of the superblock fields should be zero, and if not it |
| * means they are likely already in use, so leave them alone. We |
| * can leave it up to e2fsck to clean up any inconsistencies there. |
| */ |
| } |
| |
| /* |
| * Open the external journal device |
| */ |
| static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb) |
| { |
| struct block_device *bdev; |
| char b[BDEVNAME_SIZE]; |
| |
| bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb); |
| if (IS_ERR(bdev)) |
| goto fail; |
| return bdev; |
| |
| fail: |
| ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld", |
| __bdevname(dev, b), PTR_ERR(bdev)); |
| return NULL; |
| } |
| |
| /* |
| * Release the journal device |
| */ |
| static void ext4_blkdev_put(struct block_device *bdev) |
| { |
| blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL); |
| } |
| |
| static void ext4_blkdev_remove(struct ext4_sb_info *sbi) |
| { |
| struct block_device *bdev; |
| bdev = sbi->journal_bdev; |
| if (bdev) { |
| ext4_blkdev_put(bdev); |
| sbi->journal_bdev = NULL; |
| } |
| } |
| |
| static inline struct inode *orphan_list_entry(struct list_head *l) |
| { |
| return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode; |
| } |
| |
| static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi) |
| { |
| struct list_head *l; |
| |
| ext4_msg(sb, KERN_ERR, "sb orphan head is %d", |
| le32_to_cpu(sbi->s_es->s_last_orphan)); |
| |
| printk(KERN_ERR "sb_info orphan list:\n"); |
| list_for_each(l, &sbi->s_orphan) { |
| struct inode *inode = orphan_list_entry(l); |
| printk(KERN_ERR " " |
| "inode %s:%lu at %p: mode %o, nlink %d, next %d\n", |
| inode->i_sb->s_id, inode->i_ino, inode, |
| inode->i_mode, inode->i_nlink, |
| NEXT_ORPHAN(inode)); |
| } |
| } |
| |
| static void ext4_put_super(struct super_block *sb) |
| { |
| struct ext4_sb_info *sbi = EXT4_SB(sb); |
| struct ext4_super_block *es = sbi->s_es; |
| int i, err; |
| |
| ext4_unregister_li_request(sb); |
| dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); |
| |
| flush_workqueue(sbi->rsv_conversion_wq); |
| destroy_workqueue(sbi->rsv_conversion_wq); |
| |
| if (sbi->s_journal) { |
| err = jbd2_journal_destroy(sbi->s_journal); |
| sbi->s_journal = NULL; |
| if (err < 0) |
| ext4_abort(sb, "Couldn't clean up the journal"); |
| } |
| |
| ext4_unregister_sysfs(sb); |
| ext4_es_unregister_shrinker(sbi); |
| del_timer_sync(&sbi->s_err_report); |
| ext4_release_system_zone(sb); |
| ext4_mb_release(sb); |
| ext4_ext_release(sb); |
| |
| if (!(sb->s_flags & MS_RDONLY)) { |
| ext4_clear_feature_journal_needs_recovery(sb); |
| es->s_state = cpu_to_le16(sbi->s_mount_state); |
| } |
| if (!(sb->s_flags & MS_RDONLY)) |
| ext4_commit_super(sb, 1); |
| |
| for (i = 0; i < sbi->s_gdb_count; i++) |
| brelse(sbi->s_group_desc[i]); |
| kvfree(sbi->s_group_desc); |
| kvfree(sbi->s_flex_groups); |
| percpu_counter_destroy(&sbi->s_freeclusters_counter); |
| percpu_counter_destroy(&sbi->s_freeinodes_counter); |
| percpu_counter_destroy(&sbi->s_dirs_counter); |
| percpu_counter_destroy(&sbi->s_dirtyclusters_counter); |
| brelse(sbi->s_sbh); |
| #ifdef CONFIG_QUOTA |
| for (i = 0; i < EXT4_MAXQUOTAS; i++) |
| kfree(sbi->s_qf_names[i]); |
| #endif |
| |
| /* Debugging code just in case the in-memory inode orphan list |
| * isn't empty. The on-disk one can be non-empty if we've |
| * detected an error and taken the fs readonly, but the |
| * in-memory list had better be clean by this point. */ |
| if (!list_empty(&sbi->s_orphan)) |
| dump_orphan_list(sb, sbi); |
| J_ASSERT(list_empty(&sbi->s_orphan)); |
| |
| sync_blockdev(sb->s_bdev); |
| invalidate_bdev(sb->s_bdev); |
| if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) { |
| /* |
| * Invalidate the journal device's buffers. We don't want them |
| * floating about in memory - the physical journal device may |
| * hotswapped, and it breaks the `ro-after' testing code. |
| */ |
| sync_blockdev(sbi->journal_bdev); |
| invalidate_bdev(sbi->journal_bdev); |
| ext4_blkdev_remove(sbi); |
| } |
| if (sbi->s_mb_cache) { |
| ext4_xattr_destroy_cache(sbi->s_mb_cache); |
| sbi->s_mb_cache = NULL; |
| } |
| if (sbi->s_mmp_tsk) |
| kthread_stop(sbi->s_mmp_tsk); |
| sb->s_fs_info = NULL; |
| /* |
| * Now that we are completely done shutting down the |
| * superblock, we need to actually destroy the kobject. |
| */ |
| kobject_put(&sbi->s_kobj); |
| wait_for_completion(&sbi->s_kobj_unregister); |
| if (sbi->s_chksum_driver) |
| crypto_free_shash(sbi->s_chksum_driver); |
| kfree(sbi->s_blockgroup_lock); |
| kfree(sbi); |
| } |
| |
| static struct kmem_cache *ext4_inode_cachep; |
| |
| /* |
| * Called inside transaction, so use GFP_NOFS |
| */ |
| static struct inode *ext4_alloc_inode(struct super_block *sb) |
| { |
| struct ext4_inode_info *ei; |
| |
| ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS); |
| if (!ei) |
| return NULL; |
| |
| ei->vfs_inode.i_version = 1; |
| spin_lock_init(&ei->i_raw_lock); |
| INIT_LIST_HEAD(&ei->i_prealloc_list); |
| spin_lock_init(&ei->i_prealloc_lock); |
| ext4_es_init_tree(&ei->i_es_tree); |
| rwlock_init(&ei->i_es_lock); |
| INIT_LIST_HEAD(&ei->i_es_list); |
| ei->i_es_all_nr = 0; |
| ei->i_es_shk_nr = 0; |
| ei->i_es_shrink_lblk = 0; |
| ei->i_reserved_data_blocks = 0; |
| ei->i_reserved_meta_blocks = 0; |
| ei->i_allocated_meta_blocks = 0; |
| ei->i_da_metadata_calc_len = 0; |
| ei->i_da_metadata_calc_last_lblock = 0; |
| spin_lock_init(&(ei->i_block_reservation_lock)); |
| #ifdef CONFIG_QUOTA |
| ei->i_reserved_quota = 0; |
| memset(&ei->i_dquot, 0, sizeof(ei->i_dquot)); |
| #endif |
| ei->jinode = NULL; |
| INIT_LIST_HEAD(&ei->i_rsv_conversion_list); |
| spin_lock_init(&ei->i_completed_io_lock); |
| ei->i_sync_tid = 0; |
| ei->i_datasync_tid = 0; |
| atomic_set(&ei->i_unwritten, 0); |
| INIT_WORK(&ei->i_rsv_conversion_work, ext4_end_io_rsv_work); |
| #ifdef CONFIG_EXT4_FS_ENCRYPTION |
| ei->i_crypt_info = NULL; |
| #endif |
| return &ei->vfs_inode; |
| } |
| |
| static int ext4_drop_inode(struct inode *inode) |
| { |
| int drop = generic_drop_inode(inode); |
| |
| trace_ext4_drop_inode(inode, drop); |
| return drop; |
| } |
| |
| static void ext4_i_callback(struct rcu_head *head) |
| { |
| struct inode *inode = container_of(head, struct inode, i_rcu); |
| kmem_cache_free(ext4_inode_cachep, EXT4_I(inode)); |
| } |
| |
| static void ext4_destroy_inode(struct inode *inode) |
| { |
| if (!list_empty(&(EXT4_I(inode)->i_orphan))) { |
| ext4_msg(inode->i_sb, KERN_ERR, |
| "Inode %lu (%p): orphan list check failed!", |
| inode->i_ino, EXT4_I(inode)); |
| print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4, |
| EXT4_I(inode), sizeof(struct ext4_inode_info), |
| true); |
| dump_stack(); |
| } |
| call_rcu(&inode->i_rcu, ext4_i_callback); |
| } |
| |
| static void init_once(void *foo) |
| { |
| struct ext4_inode_info *ei = (struct ext4_inode_info *) foo; |
| |
| INIT_LIST_HEAD(&ei->i_orphan); |
| init_rwsem(&ei->xattr_sem); |
| init_rwsem(&ei->i_data_sem); |
| init_rwsem(&ei->i_mmap_sem); |
| inode_init_once(&ei->vfs_inode); |
| } |
| |
| static int __init init_inodecache(void) |
| { |
| ext4_inode_cachep = kmem_cache_create("ext4_inode_cache", |
| sizeof(struct ext4_inode_info), |
| 0, (SLAB_RECLAIM_ACCOUNT| |
| SLAB_MEM_SPREAD|SLAB_ACCOUNT), |
| init_once); |
| if (ext4_inode_cachep == NULL) |
| return -ENOMEM; |
| return 0; |
| } |
| |
| static void destroy_inodecache(void) |
| { |
| /* |
| * Make sure all delayed rcu free inodes are flushed before we |
| * destroy cache. |
| */ |
| rcu_barrier(); |
| kmem_cache_destroy(ext4_inode_cachep); |
| } |
| |
| void ext4_clear_inode(struct inode *inode) |
| { |
| invalidate_inode_buffers(inode); |
| clear_inode(inode); |
| dquot_drop(inode); |
| ext4_discard_preallocations(inode); |
| ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS); |
| if (EXT4_I(inode)->jinode) { |
| jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode), |
| EXT4_I(inode)->jinode); |
| jbd2_free_inode(EXT4_I(inode)->jinode); |
| EXT4_I(inode)->jinode = NULL; |
| } |
| #ifdef CONFIG_EXT4_FS_ENCRYPTION |
| if (EXT4_I(inode)->i_crypt_info) |
| ext4_free_encryption_info(inode, EXT4_I(inode)->i_crypt_info); |
| #endif |
| } |
| |
| static struct inode *ext4_nfs_get_inode(struct super_block *sb, |
| u64 ino, u32 generation) |
| { |
| struct inode *inode; |
| |
| if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO) |
| return ERR_PTR(-ESTALE); |
| if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)) |
| return ERR_PTR(-ESTALE); |
| |
| /* iget isn't really right if the inode is currently unallocated!! |
| * |
| * ext4_read_inode will return a bad_inode if the inode had been |
| * deleted, so we should be safe. |
| * |
| * Currently we don't know the generation for parent directory, so |
| * a generation of 0 means "accept any" |
| */ |
| inode = ext4_iget_normal(sb, ino); |
| if (IS_ERR(inode)) |
| return ERR_CAST(inode); |
| if (generation && inode->i_generation != generation) { |
| iput(inode); |
| return ERR_PTR(-ESTALE); |
| } |
| |
| return inode; |
| } |
| |
| static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid, |
| int fh_len, int fh_type) |
| { |
| return generic_fh_to_dentry(sb, fid, fh_len, fh_type, |
| ext4_nfs_get_inode); |
| } |
| |
| static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid, |
| int fh_len, int fh_type) |
| { |
| return generic_fh_to_parent(sb, fid, fh_len, fh_type, |
| ext4_nfs_get_inode); |
| } |
| |
| /* |
| * Try to release metadata pages (indirect blocks, directories) which are |
| * mapped via the block device. Since these pages could have journal heads |
| * which would prevent try_to_free_buffers() from freeing them, we must use |
| * jbd2 layer's try_to_free_buffers() function to release them. |
| */ |
| static int bdev_try_to_free_page(struct super_block *sb, struct page *page, |
| gfp_t wait) |
| { |
| journal_t *journal = EXT4_SB(sb)->s_journal; |
| |
| WARN_ON(PageChecked(page)); |
| if (!page_has_buffers(page)) |
| return 0; |
| if (journal) |
| return jbd2_journal_try_to_free_buffers(journal, page, |
| wait & ~__GFP_DIRECT_RECLAIM); |
| return try_to_free_buffers(page); |
| } |
| |
| #ifdef CONFIG_QUOTA |
| static char *quotatypes[] = INITQFNAMES; |
| #define QTYPE2NAME(t) (quotatypes[t]) |
| |
| static int ext4_write_dquot(struct dquot *dquot); |
| static int ext4_acquire_dquot(struct dquot *dquot); |
| static int ext4_release_dquot(struct dquot *dquot); |
| static int ext4_mark_dquot_dirty(struct dquot *dquot); |
| static int ext4_write_info(struct super_block *sb, int type); |
| static int ext4_quota_on(struct super_block *sb, int type, int format_id, |
| struct path *path); |
| static int ext4_quota_off(struct super_block *sb, int type); |
| static int ext4_quota_on_mount(struct super_block *sb, int type); |
| static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data, |
| size_t len, loff_t off); |
| static ssize_t ext4_quota_write(struct super_block *sb, int type, |
| const char *data, size_t len, loff_t off); |
| static int ext4_quota_enable(struct super_block *sb, int type, int format_id, |
| unsigned int flags); |
| static int ext4_enable_quotas(struct super_block *sb); |
| |
| static struct dquot **ext4_get_dquots(struct inode *inode) |
| { |
| return EXT4_I(inode)->i_dquot; |
| } |
| |
| static const struct dquot_operations ext4_quota_operations = { |
| .get_reserved_space = ext4_get_reserved_space, |
| .write_dquot = ext4_write_dquot, |
| .acquire_dquot = ext4_acquire_dquot, |
| .release_dquot = ext4_release_dquot, |
| .mark_dirty = ext4_mark_dquot_dirty, |
| .write_info = ext4_write_info, |
| .alloc_dquot = dquot_alloc, |
| .destroy_dquot = dquot_destroy, |
| .get_projid = ext4_get_projid, |
| .get_next_id = dquot_get_next_id, |
| }; |
| |
| static const struct quotactl_ops ext4_qctl_operations = { |
| .quota_on = ext4_quota_on, |
| .quota_off = ext4_quota_off, |
| .quota_sync = dquot_quota_sync, |
| .get_state = dquot_get_state, |
| .set_info = dquot_set_dqinfo, |
| .get_dqblk = dquot_get_dqblk, |
| .set_dqblk = dquot_set_dqblk, |
| .get_nextdqblk = dquot_get_next_dqblk, |
| }; |
| #endif |
| |
| static const struct super_operations ext4_sops = { |
| .alloc_inode = ext4_alloc_inode, |
| .destroy_inode = ext4_destroy_inode, |
| .write_inode = ext4_write_inode, |
| .dirty_inode = ext4_dirty_inode, |
| .drop_inode = ext4_drop_inode, |
| .evict_inode = ext4_evict_inode, |
| .put_super = ext4_put_super, |
| .sync_fs = ext4_sync_fs, |
| .freeze_fs = ext4_freeze, |
| .unfreeze_fs = ext4_unfreeze, |
| .statfs = ext4_statfs, |
| .remount_fs = ext4_remount, |
| .show_options = ext4_show_options, |
| #ifdef CONFIG_QUOTA |
| .quota_read = ext4_quota_read, |
| .quota_write = ext4_quota_write, |
| .get_dquots = ext4_get_dquots, |
| #endif |
| .bdev_try_to_free_page = bdev_try_to_free_page, |
| }; |
| |
| static const struct export_operations ext4_export_ops = { |
| .fh_to_dentry = ext4_fh_to_dentry, |
| .fh_to_parent = ext4_fh_to_parent, |
| .get_parent = ext4_get_parent, |
| }; |
| |
| enum { |
| Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid, |
| Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro, |
| Opt_nouid32, Opt_debug, Opt_removed, |
| Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl, |
| Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload, |
| Opt_commit, Opt_min_batch_time, Opt_max_batch_time, Opt_journal_dev, |
| Opt_journal_path, Opt_journal_checksum, Opt_journal_async_commit, |
| Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback, |
| Opt_data_err_abort, Opt_data_err_ignore, Opt_test_dummy_encryption, |
| Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota, |
| Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota, |
| Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err, |
| Opt_usrquota, Opt_grpquota, Opt_i_version, Opt_dax, |
| Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_mblk_io_submit, |
| Opt_lazytime, Opt_nolazytime, |
| Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity, |
| Opt_inode_readahead_blks, Opt_journal_ioprio, |
| Opt_dioread_nolock, Opt_dioread_lock, |
| Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable, |
| Opt_max_dir_size_kb, Opt_nojournal_checksum, |
| }; |
| |
| static const match_table_t tokens = { |
| {Opt_bsd_df, "bsddf"}, |
| {Opt_minix_df, "minixdf"}, |
| {Opt_grpid, "grpid"}, |
| {Opt_grpid, "bsdgroups"}, |
| {Opt_nogrpid, "nogrpid"}, |
| {Opt_nogrpid, "sysvgroups"}, |
| {Opt_resgid, "resgid=%u"}, |
| {Opt_resuid, "resuid=%u"}, |
| {Opt_sb, "sb=%u"}, |
| {Opt_err_cont, "errors=continue"}, |
| {Opt_err_panic, "errors=panic"}, |
| {Opt_err_ro, "errors=remount-ro"}, |
| {Opt_nouid32, "nouid32"}, |
| {Opt_debug, "debug"}, |
| {Opt_removed, "oldalloc"}, |
| {Opt_removed, "orlov"}, |
| {Opt_user_xattr, "user_xattr"}, |
| {Opt_nouser_xattr, "nouser_xattr"}, |
| {Opt_acl, "acl"}, |
| {Opt_noacl, "noacl"}, |
| {Opt_noload, "norecovery"}, |
| {Opt_noload, "noload"}, |
| {Opt_removed, "nobh"}, |
| {Opt_removed, "bh"}, |
| {Opt_commit, "commit=%u"}, |
| {Opt_min_batch_time, "min_batch_time=%u"}, |
| {Opt_max_batch_time, "max_batch_time=%u"}, |
| {Opt_journal_dev, "journal_dev=%u"}, |
| {Opt_journal_path, "journal_path=%s"}, |
| {Opt_journal_checksum, "journal_checksum"}, |
| {Opt_nojournal_checksum, "nojournal_checksum"}, |
| {Opt_journal_async_commit, "journal_async_commit"}, |
| {Opt_abort, "abort"}, |
| {Opt_data_journal, "data=journal"}, |
| {Opt_data_ordered, "data=ordered"}, |
| {Opt_data_writeback, "data=writeback"}, |
| {Opt_data_err_abort, "data_err=abort"}, |
| {Opt_data_err_ignore, "data_err=ignore"}, |
| {Opt_offusrjquota, "usrjquota="}, |
| {Opt_usrjquota, "usrjquota=%s"}, |
| {Opt_offgrpjquota, "grpjquota="}, |
| {Opt_grpjquota, "grpjquota=%s"}, |
| {Opt_jqfmt_vfsold, "jqfmt=vfsold"}, |
| {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"}, |
| {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"}, |
| {Opt_grpquota, "grpquota"}, |
| {Opt_noquota, "noquota"}, |
| {Opt_quota, "quota"}, |
| {Opt_usrquota, "usrquota"}, |
| {Opt_barrier, "barrier=%u"}, |
| {Opt_barrier, "barrier"}, |
| {Opt_nobarrier, "nobarrier"}, |
| {Opt_i_version, "i_version"}, |
| {Opt_dax, "dax"}, |
| {Opt_stripe, "stripe=%u"}, |
| {Opt_delalloc, "delalloc"}, |
| {Opt_lazytime, "lazytime"}, |
| {Opt_nolazytime, "nolazytime"}, |
| {Opt_nodelalloc, "nodelalloc"}, |
| {Opt_removed, "mblk_io_submit"}, |
| {Opt_removed, "nomblk_io_submit"}, |
| {Opt_block_validity, "block_validity"}, |
| {Opt_noblock_validity, "noblock_validity"}, |
| {Opt_inode_readahead_blks, "inode_readahead_blks=%u"}, |
| {Opt_journal_ioprio, "journal_ioprio=%u"}, |
| {Opt_auto_da_alloc, "auto_da_alloc=%u"}, |
| {Opt_auto_da_alloc, "auto_da_alloc"}, |
| {Opt_noauto_da_alloc, "noauto_da_alloc"}, |
| {Opt_dioread_nolock, "dioread_nolock"}, |
| {Opt_dioread_lock, "dioread_lock"}, |
| {Opt_discard, "discard"}, |
| {Opt_nodiscard, "nodiscard"}, |
| {Opt_init_itable, "init_itable=%u"}, |
| {Opt_init_itable, "init_itable"}, |
| {Opt_noinit_itable, "noinit_itable"}, |
| {Opt_max_dir_size_kb, "max_dir_size_kb=%u"}, |
| {Opt_test_dummy_encryption, "test_dummy_encryption"}, |
| {Opt_removed, "check=none"}, /* mount option from ext2/3 */ |
| {Opt_removed, "nocheck"}, /* mount option from ext2/3 */ |
| {Opt_removed, "reservation"}, /* mount option from ext2/3 */ |
| {Opt_removed, "noreservation"}, /* mount option from ext2/3 */ |
| {Opt_removed, "journal=%u"}, /* mount option from ext2/3 */ |
| {Opt_err, NULL}, |
| }; |
| |
| static ext4_fsblk_t get_sb_block(void **data) |
| { |
| ext4_fsblk_t sb_block; |
| char *options = (char *) *data; |
| |
| if (!options || strncmp(options, "sb=", 3) != 0) |
| return 1; /* Default location */ |
| |
| options += 3; |
| /* TODO: use simple_strtoll with >32bit ext4 */ |
| sb_block = simple_strtoul(options, &options, 0); |
| if (*options && *options != ',') { |
| printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n", |
| (char *) *data); |
| return 1; |
| } |
| if (*options == ',') |
| options++; |
| *data = (void *) options; |
| |
| return sb_block; |
| } |
| |
| #define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3)) |
| static char deprecated_msg[] = "Mount option \"%s\" will be removed by %s\n" |
| "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n"; |
| |
| #ifdef CONFIG_QUOTA |
| static int set_qf_name(struct super_block *sb, int qtype, substring_t *args) |
| { |
| struct ext4_sb_info *sbi = EXT4_SB(sb); |
| char *qname; |
| int ret = -1; |
| |
| if (sb_any_quota_loaded(sb) && |
| !sbi->s_qf_names[qtype]) { |
| ext4_msg(sb, KERN_ERR, |
| "Cannot change journaled " |
| "quota options when quota turned on"); |
| return -1; |
| } |
| if (ext4_has_feature_quota(sb)) { |
| ext4_msg(sb, KERN_ERR, "Cannot set journaled quota options " |
| "when QUOTA feature is enabled"); |
| return -1; |
| } |
| qname = match_strdup(args); |
| if (!qname) { |
| ext4_msg(sb, KERN_ERR, |
| "Not enough memory for storing quotafile name"); |
| return -1; |
| } |
| if (sbi->s_qf_names[qtype]) { |
| if (strcmp(sbi->s_qf_names[qtype], qname) == 0) |
| ret = 1; |
| else |
| ext4_msg(sb, KERN_ERR, |
| "%s quota file already specified", |
| QTYPE2NAME(qtype)); |
| goto errout; |
| } |
| if (strchr(qname, '/')) { |
| ext4_msg(sb, KERN_ERR, |
| "quotafile must be on filesystem root"); |
| goto errout; |
| } |
| sbi->s_qf_names[qtype] = qname; |
| set_opt(sb, QUOTA); |
| return 1; |
| errout: |
| kfree(qname); |
| return ret; |
| } |
| |
| static int clear_qf_name(struct super_block *sb, int qtype) |
| { |
| |
| struct ext4_sb_info *sbi = EXT4_SB(sb); |
| |
| if (sb_any_quota_loaded(sb) && |
| sbi->s_qf_names[qtype]) { |
| ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options" |
| " when quota turned on"); |
| return -1; |
| } |
| kfree(sbi->s_qf_names[qtype]); |
| sbi->s_qf_names[qtype] = NULL; |
| return 1; |
| } |
| #endif |
| |
| #define MOPT_SET 0x0001 |
| #define MOPT_CLEAR 0x0002 |
| #define MOPT_NOSUPPORT 0x0004 |
| #define MOPT_EXPLICIT 0x0008 |
| #define MOPT_CLEAR_ERR 0x0010 |
| #define MOPT_GTE0 0x0020 |
| #ifdef CONFIG_QUOTA |
| #define MOPT_Q 0 |
| #define MOPT_QFMT 0x0040 |
| #else |
| #define MOPT_Q MOPT_NOSUPPORT |
| #define MOPT_QFMT MOPT_NOSUPPORT |
| #endif |
| #define MOPT_DATAJ 0x0080 |
| #define MOPT_NO_EXT2 0x0100 |
| #define MOPT_NO_EXT3 0x0200 |
| #define MOPT_EXT4_ONLY (MOPT_NO_EXT2 | MOPT_NO_EXT3) |
| #define MOPT_STRING 0x0400 |
| |
| static const struct mount_opts { |
| int token; |
| int mount_opt; |
| int flags; |
| } ext4_mount_opts[] = { |
| {Opt_minix_df, EXT4_MOUNT_MINIX_DF, MOPT_SET}, |
| {Opt_bsd_df, EXT4_MOUNT_MINIX_DF, MOPT_CLEAR}, |
| {Opt_grpid, EXT4_MOUNT_GRPID, MOPT_SET}, |
| {Opt_nogrpid, EXT4_MOUNT_GRPID, MOPT_CLEAR}, |
| {Opt_block_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_SET}, |
| {Opt_noblock_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_CLEAR}, |
| {Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK, |
| MOPT_EXT4_ONLY | MOPT_SET}, |
| {Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK, |
| MOPT_EXT4_ONLY | MOPT_CLEAR}, |
| {Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET}, |
| {Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR}, |
| {Opt_delalloc, EXT4_MOUNT_DELALLOC, |
| MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT}, |
| {Opt_nodelalloc, EXT4_MOUNT_DELALLOC, |
| MOPT_EXT4_ONLY | MOPT_CLEAR}, |
| {Opt_nojournal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM, |
| MOPT_EXT4_ONLY | MOPT_CLEAR}, |
| {Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM, |
| MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT}, |
| {Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT | |
| EXT4_MOUNT_JOURNAL_CHECKSUM), |
| MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT}, |
| {Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_NO_EXT2 | MOPT_SET}, |
| {Opt_err_panic, EXT4_MOUNT_ERRORS_PANIC, MOPT_SET | MOPT_CLEAR_ERR}, |
| {Opt_err_ro, EXT4_MOUNT_ERRORS_RO, MOPT_SET | MOPT_CLEAR_ERR}, |
| {Opt_err_cont, EXT4_MOUNT_ERRORS_CONT, MOPT_SET | MOPT_CLEAR_ERR}, |
| {Opt_data_err_abort, EXT4_MOUNT_DATA_ERR_ABORT, |
| MOPT_NO_EXT2}, |
| {Opt_data_err_ignore, EXT4_MOUNT_DATA_ERR_ABORT, |
| MOPT_NO_EXT2}, |
| {Opt_barrier, EXT4_MOUNT_BARRIER, MOPT_SET}, |
| {Opt_nobarrier, EXT4_MOUNT_BARRIER, MOPT_CLEAR}, |
| {Opt_noauto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_SET}, |
| {Opt_auto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_CLEAR}, |
| {Opt_noinit_itable, EXT4_MOUNT_INIT_INODE_TABLE, MOPT_CLEAR}, |
| {Opt_commit, 0, MOPT_GTE0}, |
| {Opt_max_batch_time, 0, MOPT_GTE0}, |
| {Opt_min_batch_time, 0, MOPT_GTE0}, |
| {Opt_inode_readahead_blks, 0, MOPT_GTE0}, |
| {Opt_init_itable, 0, MOPT_GTE0}, |
| {Opt_dax, EXT4_MOUNT_DAX, MOPT_SET}, |
| {Opt_stripe, 0, MOPT_GTE0}, |
| {Opt_resuid, 0, MOPT_GTE0}, |
| {Opt_resgid, 0, MOPT_GTE0}, |
| {Opt_journal_dev, 0, MOPT_NO_EXT2 | MOPT_GTE0}, |
| {Opt_journal_path, 0, MOPT_NO_EXT2 | MOPT_STRING}, |
| {Opt_journal_ioprio, 0, MOPT_NO_EXT2 | MOPT_GTE0}, |
| {Opt_data_journal, EXT4_MOUNT_JOURNAL_DATA, MOPT_NO_EXT2 | MOPT_DATAJ}, |
| {Opt_data_ordered, EXT4_MOUNT_ORDERED_DATA, MOPT_NO_EXT2 | MOPT_DATAJ}, |
| {Opt_data_writeback, EXT4_MOUNT_WRITEBACK_DATA, |
| MOPT_NO_EXT2 | MOPT_DATAJ}, |
| {Opt_user_xattr, EXT4_MOUNT_XATTR_USER, MOPT_SET}, |
| {Opt_nouser_xattr, EXT4_MOUNT_XATTR_USER, MOPT_CLEAR}, |
| #ifdef CONFIG_EXT4_FS_POSIX_ACL |
| {Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET}, |
| {Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR}, |
| #else |
| {Opt_acl, 0, MOPT_NOSUPPORT}, |
| {Opt_noacl, 0, MOPT_NOSUPPORT}, |
| #endif |
| {Opt_nouid32, EXT4_MOUNT_NO_UID32, MOPT_SET}, |
| {Opt_debug, EXT4_MOUNT_DEBUG, MOPT_SET}, |
| {Opt_quota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, MOPT_SET | MOPT_Q}, |
| {Opt_usrquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, |
| MOPT_SET | MOPT_Q}, |
| {Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA, |
| MOPT_SET | MOPT_Q}, |
| {Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA | |
| EXT4_MOUNT_GRPQUOTA), MOPT_CLEAR | MOPT_Q}, |
| {Opt_usrjquota, 0, MOPT_Q}, |
| {Opt_grpjquota, 0, MOPT_Q}, |
| {Opt_offusrjquota, 0, MOPT_Q}, |
| {Opt_offgrpjquota, 0, MOPT_Q}, |
| {Opt_jqfmt_vfsold, QFMT_VFS_OLD, MOPT_QFMT}, |
| {Opt_jqfmt_vfsv0, QFMT_VFS_V0, MOPT_QFMT}, |
| {Opt_jqfmt_vfsv1, QFMT_VFS_V1, MOPT_QFMT}, |
| {Opt_max_dir_size_kb, 0, MOPT_GTE0}, |
| {Opt_test_dummy_encryption, 0, MOPT_GTE0}, |
| {Opt_err, 0, 0} |
| }; |
| |
| static int handle_mount_opt(struct super_block *sb, char *opt, int token, |
| substring_t *args, unsigned long *journal_devnum, |
| unsigned int *journal_ioprio, int is_remount) |
| { |
| struct ext4_sb_info *sbi = EXT4_SB(sb); |
| const struct mount_opts *m; |
| kuid_t uid; |
| kgid_t gid; |
| int arg = 0; |
| |
| #ifdef CONFIG_QUOTA |
| if (token == Opt_usrjquota) |
| return set_qf_name(sb, USRQUOTA, &args[0]); |
| else if (token == Opt_grpjquota) |
| return set_qf_name(sb, GRPQUOTA, &args[0]); |
| else if (token == Opt_offusrjquota) |
| return clear_qf_name(sb, USRQUOTA); |
| else if (token == Opt_offgrpjquota) |
| return clear_qf_name(sb, GRPQUOTA); |
| #endif |
| switch (token) { |
| case Opt_noacl: |
| case Opt_nouser_xattr: |
| ext4_msg(sb, KERN_WARNING, deprecated_msg, opt, "3.5"); |
| break; |
| case Opt_sb: |
| return 1; /* handled by get_sb_block() */ |
| case Opt_removed: |
| ext4_msg(sb, KERN_WARNING, "Ignoring removed %s option", opt); |
| return 1; |
| case Opt_abort: |
| sbi->s_mount_flags |= EXT4_MF_FS_ABORTED; |
| return 1; |
| case Opt_i_version: |
| sb->s_flags |= MS_I_VERSION; |
| return 1; |
| case Opt_lazytime: |
| sb->s_flags |= MS_LAZYTIME; |
| return 1; |
| case Opt_nolazytime: |
| sb->s_flags &= ~MS_LAZYTIME; |
| return 1; |
| } |
| |
| for (m = ext4_mount_opts; m->token != Opt_err; m++) |
| if (token == m->token) |
| break; |
| |
| if (m->token == Opt_err) { |
| ext4_msg(sb, KERN_ERR, "Unrecognized mount option \"%s\" " |
| "or missing value", opt); |
| return -1; |
| } |
| |
| if ((m->flags & MOPT_NO_EXT2) && IS_EXT2_SB(sb)) { |
| ext4_msg(sb, KERN_ERR, |
| "Mount option \"%s\" incompatible with ext2", opt); |
| return -1; |
| } |
| if ((m->flags & MOPT_NO_EXT3) && IS_EXT3_SB(sb)) { |
| ext4_msg(sb, KERN_ERR, |
| "Mount option \"%s\" incompatible with ext3", opt); |
| return -1; |
| } |
| |
| if (args->from && !(m->flags & MOPT_STRING) && match_int(args, &arg)) |
| return -1; |
| if (args->from && (m->flags & MOPT_GTE0) && (arg < 0)) |
| return -1; |
| if (m->flags & MOPT_EXPLICIT) { |
| if (m->mount_opt & EXT4_MOUNT_DELALLOC) { |
| set_opt2(sb, EXPLICIT_DELALLOC); |
| } else if (m->mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) { |
| set_opt2(sb, EXPLICIT_JOURNAL_CHECKSUM); |
| } else |
| return -1; |
| } |
| if (m->flags & MOPT_CLEAR_ERR) |
| clear_opt(sb, ERRORS_MASK); |
| if (token == Opt_noquota && sb_any_quota_loaded(sb)) { |
| ext4_msg(sb, KERN_ERR, "Cannot change quota " |
| "options when quota turned on"); |
| return -1; |
| } |
| |
| if (m->flags & MOPT_NOSUPPORT) { |
| ext4_msg(sb, KERN_ERR, "%s option not supported", opt); |
| } else if (token == Opt_commit) { |
| if (arg == 0) |
| arg = JBD2_DEFAULT_MAX_COMMIT_AGE; |
| sbi->s_commit_interval = HZ * arg; |
| } else if (token == Opt_max_batch_time) { |
| sbi->s_max_batch_time = arg; |
| } else if (token == Opt_min_batch_time) { |
| sbi->s_min_batch_time = arg; |
| } else if (token == Opt_inode_readahead_blks) { |
| if (arg && (arg > (1 << 30) || !is_power_of_2(arg))) { |
| ext4_msg(sb, KERN_ERR, |
| "EXT4-fs: inode_readahead_blks must be " |
| "0 or a power of 2 smaller than 2^31"); |
| return -1; |
| } |
| sbi->s_inode_readahead_blks = arg; |
| } else if (token == Opt_init_itable) { |
| set_opt(sb, INIT_INODE_TABLE); |
| if (!args->from) |
| arg = EXT4_DEF_LI_WAIT_MULT; |
| sbi->s_li_wait_mult = arg; |
| } else if (token == Opt_max_dir_size_kb) { |
| sbi->s_max_dir_size_kb = arg; |
| } else if (token == Opt_stripe) { |
| sbi->s_stripe = arg; |
| } else if (token == Opt_resuid) { |
| uid = make_kuid(current_user_ns(), arg); |
| if (!uid_valid(uid)) { |
| ext4_msg(sb, KERN_ERR, "Invalid uid value %d", arg); |
| return -1; |
| } |
| sbi->s_resuid = uid; |
| } else if (token == Opt_resgid) { |
| gid = make_kgid(current_user_ns(), arg); |
| if (!gid_valid(gid)) { |
| ext4_msg(sb, KERN_ERR, "Invalid gid value %d", arg); |
| return -1; |
| } |
| sbi->s_resgid = gid; |
| } else if (token == Opt_journal_dev) { |
| if (is_remount) { |
| ext4_msg(sb, KERN_ERR, |
| "Cannot specify journal on remount"); |
| return -1; |
| } |
| *journal_devnum = arg; |
| } else if (token == Opt_journal_path) { |
| char *journal_path; |
| struct inode *journal_inode; |
| struct path path; |
| int error; |
| |
| if (is_remount) { |
| ext4_msg(sb, KERN_ERR, |
| "Cannot specify journal on remount"); |
| return -1; |
| } |
| journal_path = match_strdup(&args[0]); |
| if (!journal_path) { |
| ext4_msg(sb, KERN_ERR, "error: could not dup " |
| "journal device string"); |
| return -1; |
| } |
| |
| error = kern_path(journal_path, LOOKUP_FOLLOW, &path); |
| if (error) { |
| ext4_msg(sb, KERN_ERR, "error: could not find " |
| "journal device path: error %d", error); |
| kfree(journal_path); |
| return -1; |
| } |
| |
| journal_inode = d_inode(path.dentry); |
| if (!S_ISBLK(journal_inode->i_mode)) { |
| ext4_msg(sb, KERN_ERR, "error: journal path %s " |
| "is not a block device", journal_path); |
| path_put(&path); |
| kfree(journal_path); |
| return -1; |
| } |
| |
| *journal_devnum = new_encode_dev(journal_inode->i_rdev); |
| path_put(&path); |
| kfree(journal_path); |
| } else if (token == Opt_journal_ioprio) { |
| if (arg > 7) { |
| ext4_msg(sb, KERN_ERR, "Invalid journal IO priority" |
| " (must be 0-7)"); |
| return -1; |
| } |
| *journal_ioprio = |
| IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, arg); |
| } else if (token == Opt_test_dummy_encryption) { |
| #ifdef CONFIG_EXT4_FS_ENCRYPTION |
| sbi->s_mount_flags |= EXT4_MF_TEST_DUMMY_ENCRYPTION; |
| ext4_msg(sb, KERN_WARNING, |
| "Test dummy encryption mode enabled"); |
| #else |
| ext4_msg(sb, KERN_WARNING, |
| "Test dummy encryption mount option ignored"); |
| #endif |
| } else if (m->flags & MOPT_DATAJ) { |
| if (is_remount) { |
| if (!sbi->s_journal) |
| ext4_msg(sb, KERN_WARNING, "Remounting file system with no journal so ignoring journalled data option"); |
| else if (test_opt(sb, DATA_FLAGS) != m->mount_opt) { |
| ext4_msg(sb, KERN_ERR, |
| "Cannot change data mode on remount"); |
| return -1; |
| } |
| } else { |
| clear_opt(sb, DATA_FLAGS); |
| sbi->s_mount_opt |= m->mount_opt; |
| } |
| #ifdef CONFIG_QUOTA |
| } else if (m->flags & MOPT_QFMT) { |
| if (sb_any_quota_loaded(sb) && |
| sbi->s_jquota_fmt != m->mount_opt) { |
| ext4_msg(sb, KERN_ERR, "Cannot change journaled " |
| "quota options when quota turned on"); |
| return -1; |
| } |
| if (ext4_has_feature_quota(sb)) { |
| ext4_msg(sb, KERN_ERR, |
| "Cannot set journaled quota options " |
| "when QUOTA feature is enabled"); |
| return -1; |
| } |
| sbi->s_jquota_fmt = m->mount_opt; |
| #endif |
| } else if (token == Opt_dax) { |
| #ifdef CONFIG_FS_DAX |
| ext4_msg(sb, KERN_WARNING, |
| "DAX enabled. Warning: EXPERIMENTAL, use at your own risk"); |
| sbi->s_mount_opt |= m->mount_opt; |
| #else |
| ext4_msg(sb, KERN_INFO, "dax option not supported"); |
| return -1; |
| #endif |
| } else if (token == Opt_data_err_abort) { |
| sbi->s_mount_opt |= m->mount_opt; |
| } else if (token == Opt_data_err_ignore) { |
| sbi->s_mount_opt &= ~m->mount_opt; |
| } else { |
| if (!args->from) |
| arg = 1; |
| if (m->flags & MOPT_CLEAR) |
| arg = !arg; |
| else if (unlikely(!(m->flags & MOPT_SET))) { |
| ext4_msg(sb, KERN_WARNING, |
| "buggy handling of option %s", opt); |
| WARN_ON(1); |
| return -1; |
| } |
| if (arg != 0) |
| sbi->s_mount_opt |= m->mount_opt; |
| else |
| sbi->s_mount_opt &= ~m->mount_opt; |
| } |
| return 1; |
| } |
| |
| static int parse_options(char *options, struct super_block *sb, |
| unsigned long *journal_devnum, |
| unsigned int *journal_ioprio, |
| int is_remount) |
| { |
| struct ext4_sb_info *sbi = EXT4_SB(sb); |
| char *p; |
| substring_t args[MAX_OPT_ARGS]; |
| int token; |
| |
| if (!options) |
| return 1; |
| |
| while ((p = strsep(&options, ",")) != NULL) { |
| if (!*p) |
| continue; |
| /* |
| * Initialize args struct so we know whether arg was |
| * found; some options take optional arguments. |
| */ |
| args[0].to = args[0].from = NULL; |
| token = match_token(p, tokens, args); |
| if (handle_mount_opt(sb, p, token, args, journal_devnum, |
| journal_ioprio, is_remount) < 0) |
| return 0; |
| } |
| #ifdef CONFIG_QUOTA |
| if (ext4_has_feature_quota(sb) && |
| (test_opt(sb, USRQUOTA) || test_opt(sb, GRPQUOTA))) { |
| ext4_msg(sb, KERN_ERR, "Cannot set quota options when QUOTA " |
| "feature is enabled"); |
| return 0; |
| } |
| if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) { |
| if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA]) |
| clear_opt(sb, USRQUOTA); |
| |
| if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA]) |
| clear_opt(sb, GRPQUOTA); |
| |
| if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) { |
| ext4_msg(sb, KERN_ERR, "old and new quota " |
| "format mixing"); |
| return 0; |
| } |
| |
| if (!sbi->s_jquota_fmt) { |
| ext4_msg(sb, KERN_ERR, "journaled quota format " |
| "not specified"); |
| return 0; |
| } |
| } |
| #endif |
| if (test_opt(sb, DIOREAD_NOLOCK)) { |
| int blocksize = |
| BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size); |
| |
| if (blocksize < PAGE_CACHE_SIZE) { |
| ext4_msg(sb, KERN_ERR, "can't mount with " |
| "dioread_nolock if block size != PAGE_SIZE"); |
| return 0; |
| } |
| } |
| if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA && |
| test_opt(sb, JOURNAL_ASYNC_COMMIT)) { |
| ext4_msg(sb, KERN_ERR, "can't mount with journal_async_commit " |
| "in data=ordered mode"); |
| return 0; |
| } |
| return 1; |
| } |
| |
| static inline void ext4_show_quota_options(struct seq_file *seq, |
| struct super_block *sb) |
| { |
| #if defined(CONFIG_QUOTA) |
| struct ext4_sb_info *sbi = EXT4_SB(sb); |
| |
| if (sbi->s_jquota_fmt) { |
| char *fmtname = ""; |
| |
| switch (sbi->s_jquota_fmt) { |
| case QFMT_VFS_OLD: |
| fmtname = "vfsold"; |
| break; |
| case QFMT_VFS_V0: |
| fmtname = "vfsv0"; |
| break; |
| case QFMT_VFS_V1: |
| fmtname = "vfsv1"; |
| break; |
| } |
| seq_printf(seq, ",jqfmt=%s", fmtname); |
| } |
| |
| if (sbi->s_qf_names[USRQUOTA]) |
| seq_show_option(seq, "usrjquota", sbi->s_qf_names[USRQUOTA]); |
| |
| if (sbi->s_qf_names[GRPQUOTA]) |
| seq_show_option(seq, "grpjquota", sbi->s_qf_names[GRPQUOTA]); |
| #endif |
| } |
| |
| static const char *token2str(int token) |
| { |
| const struct match_token *t; |
| |
| for (t = tokens; t->token != Opt_err; t++) |
| if (t->token == token && !strchr(t->pattern, '=')) |
| break; |
| return t->pattern; |
| } |
| |
| /* |
| * Show an option if |
| * - it's set to a non-default value OR |
| * - if the per-sb default is different from the global default |
| */ |
| static int _ext4_show_options(struct seq_file *seq, struct super_block *sb, |
| int nodefs) |
| { |
| struct ext4_sb_info *sbi = EXT4_SB(sb); |
| struct ext4_super_block *es = sbi->s_es; |
| int def_errors, def_mount_opt = nodefs ? 0 : sbi->s_def_mount_opt; |
| const struct mount_opts *m; |
| char sep = nodefs ? '\n' : ','; |
| |
| #define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep) |
| #define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg) |
| |
| if (sbi->s_sb_block != 1) |
| SEQ_OPTS_PRINT("sb=%llu", sbi->s_sb_block); |
| |
| for (m = ext4_mount_opts; m->token != Opt_err; m++) { |
| int want_set = m->flags & MOPT_SET; |
| if (((m->flags & (MOPT_SET|MOPT_CLEAR)) == 0) || |
| (m->flags & MOPT_CLEAR_ERR)) |
| continue; |
| if (!(m->mount_opt & (sbi->s_mount_opt ^ def_mount_opt))) |
| continue; /* skip if same as the default */ |
| if ((want_set && |
| (sbi->s_mount_opt & m->mount_opt) != m->mount_opt) || |
| (!want_set && (sbi->s_mount_opt & m->mount_opt))) |
| continue; /* select Opt_noFoo vs Opt_Foo */ |
| SEQ_OPTS_PRINT("%s", token2str(m->token)); |
| } |
| |
| if (nodefs || !uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT4_DEF_RESUID)) || |
| le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) |
| SEQ_OPTS_PRINT("resuid=%u", |
| from_kuid_munged(&init_user_ns, sbi->s_resuid)); |
| if (nodefs || !gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT4_DEF_RESGID)) || |
| le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) |
| SEQ_OPTS_PRINT("resgid=%u", |
| from_kgid_munged(&init_user_ns, sbi->s_resgid)); |
| def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors); |
| if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO) |
| SEQ_OPTS_PUTS("errors=remount-ro"); |
| if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE) |
| SEQ_OPTS_PUTS("errors=continue"); |
| if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC) |
| SEQ_OPTS_PUTS("errors=panic"); |
| if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) |
| SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ); |
| if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME) |
| SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time); |
| if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME) |
| SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time); |
| if (sb->s_flags & MS_I_VERSION) |
| SEQ_OPTS_PUTS("i_version"); |
| if (nodefs || sbi->s_stripe) |
| SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe); |
| if (EXT4_MOUNT_DATA_FLAGS & (sbi->s_mount_opt ^ def_mount_opt)) { |
| if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) |
| SEQ_OPTS_PUTS("data=journal"); |
| else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) |
| SEQ_OPTS_PUTS("data=ordered"); |
| else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA) |
| SEQ_OPTS_PUTS("data=writeback"); |
| } |
| if (nodefs || |
| sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS) |
| SEQ_OPTS_PRINT("inode_readahead_blks=%u", |
| sbi->s_inode_readahead_blks); |
| |
| if (nodefs || (test_opt(sb, INIT_INODE_TABLE) && |
| (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT))) |
| SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult); |
| if (nodefs || sbi->s_max_dir_size_kb) |
| SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi->s_max_dir_size_kb); |
| if (test_opt(sb, DATA_ERR_ABORT)) |
| SEQ_OPTS_PUTS("data_err=abort"); |
| |
| ext4_show_quota_options(seq, sb); |
| return 0; |
| } |
| |
| static int ext4_show_options(struct seq_file *seq, struct dentry *root) |
| { |
| return _ext4_show_options(seq, root->d_sb, 0); |
| } |
| |
| int ext4_seq_options_show(struct seq_file *seq, void *offset) |
| { |
| struct super_block *sb = seq->private; |
| int rc; |
| |
| seq_puts(seq, (sb->s_flags & MS_RDONLY) ? "ro" : "rw"); |
| rc = _ext4_show_options(seq, sb, 1); |
| seq_puts(seq, "\n"); |
| return rc; |
| } |
| |
| static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es, |
| int read_only) |
| { |
| struct ext4_sb_info *sbi = EXT4_SB(sb); |
| int res = 0; |
| |
| if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) { |
| ext4_msg(sb, KERN_ERR, "revision level too high, " |
| "forcing read-only mode"); |
| res = MS_RDONLY; |
| } |
| if (read_only) |
| goto done; |
| if (!(sbi->s_mount_state & EXT4_VALID_FS)) |
| ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, " |
| "running e2fsck is recommended"); |
| else if (sbi->s_mount_state & EXT4_ERROR_FS) |
| ext4_msg(sb, KERN_WARNING, |
| "warning: mounting fs with errors, " |
| "running e2fsck is recommended"); |
| else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 && |
| le16_to_cpu(es->s_mnt_count) >= |
| (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count)) |
| ext4_msg(sb, KERN_WARNING, |
| "warning: maximal mount count reached, " |
| "running e2fsck is recommended"); |
| else if (le32_to_cpu(es->s_checkinterval) && |
| (le32_to_cpu(es->s_lastcheck) + |
| le32_to_cpu(es->s_checkinterval) <= get_seconds())) |
| ext4_msg(sb, KERN_WARNING, |
| "warning: checktime reached, " |
| "running e2fsck is recommended"); |
| if (!sbi->s_journal) |
| es->s_state &= cpu_to_le16(~EXT4_VALID_FS); |
| if (!(__s16) le16_to_cpu(es->s_max_mnt_count)) |
| es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT); |
| le16_add_cpu(&es->s_mnt_count, 1); |
| es->s_mtime = cpu_to_le32(get_seconds()); |
| ext4_update_dynamic_rev(sb); |
| if (sbi->s_journal) |
| ext4_set_feature_journal_needs_recovery(sb); |
| |
| ext4_commit_super(sb, 1); |
| done: |
| if (test_opt(sb, DEBUG)) |
| printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, " |
| "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n", |
| sb->s_blocksize, |
| sbi->s_groups_count, |
| EXT4_BLOCKS_PER_GROUP(sb), |
| EXT4_INODES_PER_GROUP(sb), |
| sbi->s_mount_opt, sbi->s_mount_opt2); |
| |
| cleancache_init_fs(sb); |
| return res; |
| } |
| |
| int ext4_alloc_flex_bg_array(struct super_block *sb, ext4_group_t ngroup) |
| { |
| struct ext4_sb_info *sbi = EXT4_SB(sb); |
| struct flex_groups *new_groups; |
| int size; |
| |
| if (!sbi->s_log_groups_per_flex) |
| return 0; |
| |
| size = ext4_flex_group(sbi, ngroup - 1) + 1; |
| if (size <= sbi->s_flex_groups_allocated) |
| return 0; |
| |
| size = roundup_pow_of_two(size * sizeof(struct flex_groups)); |
| new_groups = ext4_kvzalloc(size, GFP_KERNEL); |
| if (!new_groups) { |
| ext4_msg(sb, KERN_ERR, "not enough memory for %d flex groups", |
| size / (int) sizeof(struct flex_groups)); |
| return -ENOMEM; |
| } |
| |
| if (sbi->s_flex_groups) { |
| memcpy(new_groups, sbi->s_flex_groups, |
| (sbi->s_flex_groups_allocated * |
| sizeof(struct flex_groups))); |
| kvfree(sbi->s_flex_groups); |
| } |
| sbi->s_flex_groups = new_groups; |
| sbi->s_flex_groups_allocated = size / sizeof(struct flex_groups); |
| return 0; |
| } |
| |
| static int ext4_fill_flex_info(struct super_block *sb) |
| { |
| struct ext4_sb_info *sbi = EXT4_SB(sb); |
| struct ext4_group_desc *gdp = NULL; |
| ext4_group_t flex_group; |
| int i, err; |
| |
| sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex; |
| if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) { |
| sbi->s_log_groups_per_flex = 0; |
| return 1; |
| } |
| |
| err = ext4_alloc_flex_bg_array(sb, sbi->s_groups_count); |
| if (err) |
| goto failed; |
| |
| for (i = 0; i < sbi->s_groups_count; i++) { |
| gdp = ext4_get_group_desc(sb, i, NULL); |
| |
| flex_group = ext4_flex_group(sbi, i); |
| atomic_add(ext4_free_inodes_count(sb, gdp), |
| &sbi->s_flex_groups[flex_group].free_inodes); |
| atomic64_add(ext4_free_group_clusters(sb, gdp), |
| &sbi->s_flex_groups[flex_group].free_clusters); |
| atomic_add(ext4_used_dirs_count(sb, gdp), |
| &sbi->s_flex_groups[flex_group].used_dirs); |
| } |
| |
| return 1; |
| failed: |
| return 0; |
| } |
| |
| static __le16 ext4_group_desc_csum(struct super_block *sb, __u32 block_group, |
| struct ext4_group_desc *gdp) |
| { |
| int offset; |
| __u16 crc = 0; |
| __le32 le_group = cpu_to_le32(block_group); |
| struct ext4_sb_info *sbi = EXT4_SB(sb); |
| |
| if (ext4_has_metadata_csum(sbi->s_sb)) { |
| /* Use new metadata_csum algorithm */ |
| __le16 save_csum; |
| __u32 csum32; |
| |
| save_csum = gdp->bg_checksum; |
| gdp->bg_checksum = 0; |
| csum32 = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&le_group, |
| sizeof(le_group)); |
| csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp, |
| sbi->s_desc_size); |
| gdp->bg_checksum = save_csum; |
| |
| crc = csum32 & 0xFFFF; |
| goto out; |
| } |
| |
| /* old crc16 code */ |
| if (!ext4_has_feature_gdt_csum(sb)) |
| return 0; |
| |
| offset = offsetof(struct ext4_group_desc, bg_checksum); |
| |
| crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid)); |
| crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group)); |
| crc = crc16(crc, (__u8 *)gdp, offset); |
| offset += sizeof(gdp->bg_checksum); /* skip checksum */ |
| /* for checksum of struct ext4_group_desc do the rest...*/ |
| if (ext4_has_feature_64bit(sb) && |
| offset < le16_to_cpu(sbi->s_es->s_desc_size)) |
| crc = crc16(crc, (__u8 *)gdp + offset, |
| le16_to_cpu(sbi->s_es->s_desc_size) - |
| offset); |
| |
| out: |
| return cpu_to_le16(crc); |
| } |
| |
| int ext4_group_desc_csum_verify(struct super_block *sb, __u32 block_group, |
| struct ext4_group_desc *gdp) |
| { |
| if (ext4_has_group_desc_csum(sb) && |
| (gdp->bg_checksum != ext4_group_desc_csum(sb, block_group, gdp))) |
| return 0; |
| |
| return 1; |
| } |
| |
| void ext4_group_desc_csum_set(struct super_block *sb, __u32 block_group, |
| struct ext4_group_desc *gdp) |
| { |
| if (!ext4_has_group_desc_csum(sb)) |
| return; |
| gdp->bg_checksum = ext4_group_desc_csum(sb, block_group, gdp); |
| } |
| |
| /* Called at mount-time, super-block is locked */ |
| static int ext4_check_descriptors(struct super_block *sb, |
| ext4_group_t *first_not_zeroed) |
| { |
| struct ext4_sb_info *sbi = EXT4_SB(sb); |
| ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block); |
| ext4_fsblk_t last_block; |
| ext4_fsblk_t block_bitmap; |
| ext4_fsblk_t inode_bitmap; |
| ext4_fsblk_t inode_table; |
| int flexbg_flag = 0; |
| ext4_group_t i, grp = sbi->s_groups_count; |
| |
| if (ext4_has_feature_flex_bg(sb)) |
| flexbg_flag = 1; |
| |
| ext4_debug("Checking group descriptors"); |
| |
| for (i = 0; i < sbi->s_groups_count; i++) { |
| struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL); |
| |
| if (i == sbi->s_groups_count - 1 || flexbg_flag) |
| last_block = ext4_blocks_count(sbi->s_es) - 1; |
| else |
| last_block = first_block + |
| (EXT4_BLOCKS_PER_GROUP(sb) - 1); |
| |
| if ((grp == sbi->s_groups_count) && |
| !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED))) |
| grp = i; |
| |
| block_bitmap = ext4_block_bitmap(sb, gdp); |
| if (block_bitmap < first_block || block_bitmap > last_block) { |
| ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " |
| "Block bitmap for group %u not in group " |
| "(block %llu)!", i, block_bitmap); |
| return 0; |
| } |
| inode_bitmap = ext4_inode_bitmap(sb, gdp); |
| if (inode_bitmap < first_block || inode_bitmap > last_block) { |
| ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " |
| "Inode bitmap for group %u not in group " |
| "(block %llu)!", i, inode_bitmap); |
| return 0; |
| } |
| inode_table = ext4_inode_table(sb, gdp); |
| if (inode_table < first_block || |
| inode_table + sbi->s_itb_per_group - 1 > last_block) { |
| ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " |
| "Inode table for group %u not in group " |
| "(block %llu)!", i, inode_table); |
| return 0; |
| } |
| ext4_lock_group(sb, i); |
| if (!ext4_group_desc_csum_verify(sb, i, gdp)) { |
| ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " |
| "Checksum for group %u failed (%u!=%u)", |
| i, le16_to_cpu(ext4_group_desc_csum(sb, i, |
| gdp)), le16_to_cpu(gdp->bg_checksum)); |
| if (!(sb->s_flags & MS_RDONLY)) { |
| ext4_unlock_group(sb, i); |
| return 0; |
| } |
| } |
| ext4_unlock_group(sb, i); |
| if (!flexbg_flag) |
| first_block += EXT4_BLOCKS_PER_GROUP(sb); |
| } |
| if (NULL != first_not_zeroed) |
| *first_not_zeroed = grp; |
| return 1; |
| } |
| |
| /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at |
| * the superblock) which were deleted from all directories, but held open by |
| * a process at the time of a crash. We walk the list and try to delete these |
| * inodes at recovery time (only with a read-write filesystem). |
| * |
| * In order to keep the orphan inode chain consistent during traversal (in |
| * case of crash during recovery), we link each inode into the superblock |
| * orphan list_head and handle it the same way as an inode deletion during |
| * normal operation (which journals the operations for us). |
| * |
| * We only do an iget() and an iput() on each inode, which is very safe if we |
| * accidentally point at an in-use or already deleted inode. The worst that |
| * can happen in this case is that we get a "bit already cleared" message from |
| * ext4_free_inode(). The only reason we would point at a wrong inode is if |
| * e2fsck was run on this filesystem, and it must have already done the orphan |
| * inode cleanup for us, so we can safely abort without any further action. |
| */ |
| static void ext4_orphan_cleanup(struct super_block *sb, |
| struct ext4_super_block *es) |
| { |
| unsigned int s_flags = sb->s_flags; |
| int nr_orphans = 0, nr_truncates = 0; |
| #ifdef CONFIG_QUOTA |
| int i; |
| #endif |
| if (!es->s_last_orphan) { |
| jbd_debug(4, "no orphan inodes to clean up\n"); |
| return; |
| } |
| |
| if (bdev_read_only(sb->s_bdev)) { |
| ext4_msg(sb, KERN_ERR, "write access " |
| "unavailable, skipping orphan cleanup"); |
| return; |
| } |
| |
| /* Check if feature set would not allow a r/w mount */ |
| if (!ext4_feature_set_ok(sb, 0)) { |
| ext4_msg(sb, KERN_INFO, "Skipping orphan cleanup due to " |
| "unknown ROCOMPAT features"); |
| return; |
| } |
| |
| if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) { |
| /* don't clear list on RO mount w/ errors */ |
| if (es->s_last_orphan && !(s_flags & MS_RDONLY)) { |
| ext4_msg(sb, KERN_INFO, "Errors on filesystem, " |
| "clearing orphan list.\n"); |
| es->s_last_orphan = 0; |
| } |
| jbd_debug(1, "Skipping orphan recovery on fs with errors.\n"); |
| return; |
| } |
| |
| if (s_flags & MS_RDONLY) { |
| ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs"); |
| sb->s_flags &= ~MS_RDONLY; |
| } |
| #ifdef CONFIG_QUOTA |
| /* Needed for iput() to work correctly and not trash data */ |
| sb->s_flags |= MS_ACTIVE; |
| /* Turn on quotas so that they are updated correctly */ |
| for (i = 0; i < EXT4_MAXQUOTAS; i++) { |
| if (EXT4_SB(sb)->s_qf_names[i]) { |
| int ret = ext4_quota_on_mount(sb, i); |
| if (ret < 0) |
| ext4_msg(sb, KERN_ERR, |
| "Cannot turn on journaled " |
| "quota: error %d", ret); |
| } |
| } |
| #endif |
| |
| while (es->s_last_orphan) { |
| struct inode *inode; |
| |
| inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan)); |
| if (IS_ERR(inode)) { |
| es->s_last_orphan = 0; |
| break; |
| } |
| |
| list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan); |
| dquot_initialize(inode); |
| if (inode->i_nlink) { |
| if (test_opt(sb, DEBUG)) |
| ext4_msg(sb, KERN_DEBUG, |
| "%s: truncating inode %lu to %lld bytes", |
| __func__, inode->i_ino, inode->i_size); |
| jbd_debug(2, "truncating inode %lu to %lld bytes\n", |
| inode->i_ino, inode->i_size); |
| inode_lock(inode); |
| truncate_inode_pages(inode->i_mapping, inode->i_size); |
| ext4_truncate(inode); |
| inode_unlock(inode); |
| nr_truncates++; |
| } else { |
| if (test_opt(sb, DEBUG)) |
| ext4_msg(sb, KERN_DEBUG, |
| "%s: deleting unreferenced inode %lu", |
| __func__, inode->i_ino); |
| jbd_debug(2, "deleting unreferenced inode %lu\n", |
| inode->i_ino); |
| nr_orphans++; |
| } |
| iput(inode); /* The delete magic happens here! */ |
| } |
| |
| #define PLURAL(x) (x), ((x) == 1) ? "" : "s" |
| |
| if (nr_orphans) |
| ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted", |
| PLURAL(nr_orphans)); |
| if (nr_truncates) |
| ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up", |
| PLURAL(nr_truncates)); |
| #ifdef CONFIG_QUOTA |
| /* Turn quotas off */ |
| for (i = 0; i < EXT4_MAXQUOTAS; i++) { |
| if (sb_dqopt(sb)->files[i]) |
| dquot_quota_off(sb, i); |
| } |
| #endif |
| sb->s_flags = s_flags; /* Restore MS_RDONLY status */ |
| } |
| |
| /* |
| * Maximal extent format file size. |
| * Resulting logical blkno at s_maxbytes must fit in our on-disk |
| * extent format containers, within a sector_t, and within i_blocks |
| * in the vfs. ext4 inode has 48 bits of i_block in fsblock units, |
| * so that won't be a limiting factor. |
| * |
| * However there is other limiting factor. We do store extents in the form |
| * of starting block and length, hence the resulting length of the extent |
| * covering maximum file size must fit into on-disk format containers as |
| * well. Given that length is always by 1 unit bigger than max unit (because |
| * we count 0 as well) we have to lower the s_maxbytes by one fs block. |
| * |
| * Note, this does *not* consider any metadata overhead for vfs i_blocks. |
| */ |
| static loff_t ext4_max_size(int blkbits, int has_huge_files) |
| { |
| loff_t res; |
| loff_t upper_limit = MAX_LFS_FILESIZE; |
| |
| /* small i_blocks in vfs inode? */ |
| if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) { |
| /* |
| * CONFIG_LBDAF is not enabled implies the inode |
| * i_block represent total blocks in 512 bytes |
| * 32 == size of vfs inode i_blocks * 8 |
| */ |
| upper_limit = (1LL << 32) - 1; |
| |
| /* total blocks in file system block size */ |
| upper_limit >>= (blkbits - 9); |
| upper_limit <<= blkbits; |
| } |
| |
| /* |
| * 32-bit extent-start container, ee_block. We lower the maxbytes |
| * by one fs block, so ee_len can cover the extent of maximum file |
| * size |
| */ |
| res = (1LL << 32) - 1; |
| res <<= blkbits; |
| |
| /* Sanity check against vm- & vfs- imposed limits */ |
| if (res > upper_limit) |
| res = upper_limit; |
| |
| return res; |
| } |
| |
| /* |
| * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect |
| * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks. |
| * We need to be 1 filesystem block less than the 2^48 sector limit. |
| */ |
| static loff_t ext4_max_bitmap_size(int bits, int has_huge_files) |
| { |
| loff_t res = EXT4_NDIR_BLOCKS; |
| int meta_blocks; |
| loff_t upper_limit; |
| /* This is calculated to be the largest file size for a dense, block |
| * mapped file such that the file's total number of 512-byte sectors, |
| * including data and all indirect blocks, does not exceed (2^48 - 1). |
| * |
| * __u32 i_blocks_lo and _u16 i_blocks_high represent the total |
| * number of 512-byte sectors of the file. |
| */ |
| |
| if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) { |
| /* |
| * !has_huge_files or CONFIG_LBDAF not enabled implies that |
| * the inode i_block field represents total file blocks in |
| * 2^32 512-byte sectors == size of vfs inode i_blocks * 8 |
| */ |
| upper_limit = (1LL << 32) - 1; |
| |
| /* total blocks in file system block size */ |
| upper_limit >>= (bits - 9); |
| |
| } else { |
| /* |
| * We use 48 bit ext4_inode i_blocks |
| * With EXT4_HUGE_FILE_FL set the i_blocks |
| * represent total number of blocks in |
| * file system block size |
| */ |
| upper_limit = (1LL << 48) - 1; |
| |
| } |
| |
| /* indirect blocks */ |
| meta_blocks = 1; |
| /* double indirect blocks */ |
| meta_blocks += 1 + (1LL << (bits-2)); |
| /* tripple indirect blocks */ |
| meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2))); |
| |
| upper_limit -= meta_blocks; |
| upper_limit <<= bits; |
| |
| res += 1LL << (bits-2); |
| res += 1LL << (2*(bits-2)); |
| res += 1LL << (3*(bits-2)); |
| res <<= bits; |
| if (res > upper_limit) |
| res = upper_limit; |
| |
| if (res > MAX_LFS_FILESIZE) |
| res = MAX_LFS_FILESIZE; |
| |
| return res; |
| } |
| |
| static ext4_fsblk_t descriptor_loc(struct super_block *sb, |
| ext4_fsblk_t logical_sb_block, int nr) |
| { |
| struct ext4_sb_info *sbi = EXT4_SB(sb); |
| ext4_group_t bg, first_meta_bg; |
| int has_super = 0; |
| |
| first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg); |
| |
| if (!ext4_has_feature_meta_bg(sb) || nr < first_meta_bg) |
| return logical_sb_block + nr + 1; |
| bg = sbi->s_desc_per_block * nr; |
| if (ext4_bg_has_super(sb, bg)) |
| has_super = 1; |
| |
| /* |
| * If we have a meta_bg fs with 1k blocks, group 0's GDT is at |
| * block 2, not 1. If s_first_data_block == 0 (bigalloc is enabled |
| * on modern mke2fs or blksize > 1k on older mke2fs) then we must |
| * compensate. |
| */ |
| if (sb->s_blocksize == 1024 && nr == 0 && |
| le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block) == 0) |
| has_super++; |
| |
| return (has_super + ext4_group_first_block_no(sb, bg)); |
| } |
| |
| /** |
| * ext4_get_stripe_size: Get the stripe size. |
| * @sbi: In memory super block info |
| * |
| * If we have specified it via mount option, then |
| * use the mount option value. If the value specified at mount time is |
| * greater than the blocks per group use the super block value. |
| * If the super block value is greater than blocks per group return 0. |
| * Allocator needs it be less than blocks per group. |
| * |
| */ |
| static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi) |
| { |
| unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride); |
| unsigned long stripe_width = |
| le32_to_cpu(sbi->s_es->s_raid_stripe_width); |
| int ret; |
| |
| if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group) |
| ret = sbi->s_stripe; |
| else if (stripe_width <= sbi->s_blocks_per_group) |
| ret = stripe_width; |
| else if (stride <= sbi->s_blocks_per_group) |
| ret = stride; |
| else |
| ret = 0; |
| |
| /* |
| * If the stripe width is 1, this makes no sense and |
| * we set it to 0 to turn off stripe handling code. |
| */ |
| if (ret <= 1) |
| ret = 0; |
| |
| return ret; |
| } |
| |
| /* |
| * Check whether this filesystem can be mounted based on |
| * the features present and the RDONLY/RDWR mount requested. |
| * Returns 1 if this filesystem can be mounted as requested, |
| * 0 if it cannot be. |
| */ |
| static int ext4_feature_set_ok(struct super_block *sb, int readonly) |
| { |
| if (ext4_has_unknown_ext4_incompat_features(sb)) { |
| ext4_msg(sb, KERN_ERR, |
| "Couldn't mount because of " |
| "unsupported optional features (%x)", |
| (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) & |
| ~EXT4_FEATURE_INCOMPAT_SUPP)); |
| return 0; |
| } |
| |
| if (readonly) |
| return 1; |
| |
| if (ext4_has_feature_readonly(sb)) { |
| ext4_msg(sb, KERN_INFO, "filesystem is read-only"); |
| sb->s_flags |= MS_RDONLY; |
| return 1; |
| } |
| |
| /* Check that feature set is OK for a read-write mount */ |
| if (ext4_has_unknown_ext4_ro_compat_features(sb)) { |
| ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of " |
| "unsupported optional features (%x)", |
| (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) & |
| ~EXT4_FEATURE_RO_COMPAT_SUPP)); |
| return 0; |
| } |
| /* |
| * Large file size enabled file system can only be mounted |
| * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF |
| */ |
| if (ext4_has_feature_huge_file(sb)) { |
| if (sizeof(blkcnt_t) < sizeof(u64)) { |
| ext4_msg(sb, KERN_ERR, "Filesystem with huge files " |
| "cannot be mounted RDWR without " |
| "CONFIG_LBDAF"); |
| return 0; |
| } |
| } |
| if (ext4_has_feature_bigalloc(sb) && !ext4_has_feature_extents(sb)) { |
| ext4_msg(sb, KERN_ERR, |
| "Can't support bigalloc feature without " |
| "extents feature\n"); |
| return 0; |
| } |
| |
| #ifndef CONFIG_QUOTA |
| if (ext4_has_feature_quota(sb) && !readonly) { |
| ext4_msg(sb, KERN_ERR, |
| "Filesystem with quota feature cannot be mounted RDWR " |
| "without CONFIG_QUOTA"); |
| return 0; |
| } |
| if (ext4_has_feature_project(sb) && !readonly) { |
| ext4_msg(sb, KERN_ERR, |
| "Filesystem with project quota feature cannot be mounted RDWR " |
| "without CONFIG_QUOTA"); |
| return 0; |
| } |
| #endif /* CONFIG_QUOTA */ |
| return 1; |
| } |
| |
| /* |
| * This function is called once a day if we have errors logged |
| * on the file system |
| */ |
| static void print_daily_error_info(unsigned long arg) |
| { |
| struct super_block *sb = (struct super_block *) arg; |
| struct ext4_sb_info *sbi; |
| struct ext4_super_block *es; |
| |
| sbi = EXT4_SB(sb); |
| es = sbi->s_es; |
| |
| if (es->s_error_count) |
| /* fsck newer than v1.41.13 is needed to clean this condition. */ |
| ext4_msg(sb, KERN_NOTICE, "error count since last fsck: %u", |
| le32_to_cpu(es->s_error_count)); |
| if (es->s_first_error_time) { |
| printk(KERN_NOTICE "EXT4-fs (%s): initial error at time %u: %.*s:%d", |
| sb->s_id, le32_to_cpu(es->s_first_error_time), |
| (int) sizeof(es->s_first_error_func), |
| es->s_first_error_func, |
| le32_to_cpu(es->s_first_error_line)); |
| if (es->s_first_error_ino) |
| printk(": inode %u", |
| le32_to_cpu(es->s_first_error_ino)); |
| if (es->s_first_error_block) |
| printk(": block %llu", (unsigned long long) |
| le64_to_cpu(es->s_first_error_block)); |
| printk("\n"); |
| } |
| if (es->s_last_error_time) { |
| printk(KERN_NOTICE "EXT4-fs (%s): last error at time %u: %.*s:%d", |
| sb->s_id, le32_to_cpu(es->s_last_error_time), |
| (int) sizeof(es->s_last_error_func), |
| es->s_last_error_func, |
| le32_to_cpu(es->s_last_error_line)); |
| if (es->s_last_error_ino) |
| printk(": inode %u", |
| le32_to_cpu(es->s_last_error_ino)); |
| if (es->s_last_error_block) |
| printk(": block %llu", (unsigned long long) |
| le64_to_cpu(es->s_last_error_block)); |
| printk("\n"); |
| } |
| mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */ |
| } |
| |
| /* Find next suitable group and run ext4_init_inode_table */ |
| static int ext4_run_li_request(struct ext4_li_request *elr) |
| { |
| struct ext4_group_desc *gdp = NULL; |
| ext4_group_t group, ngroups; |
| struct super_block *sb; |
| unsigned long timeout = 0; |
| int ret = 0; |
| |
| sb = elr->lr_super; |
| ngroups = EXT4_SB(sb)->s_groups_count; |
| |
| sb_start_write(sb); |
| for (group = elr->lr_next_group; group < ngroups; group++) { |
| gdp = ext4_get_group_desc(sb, group, NULL); |
| if (!gdp) { |
| ret = 1; |
| break; |
| } |
| |
| if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED))) |
| break; |
| } |
| |
| if (group >= ngroups) |
| ret = 1; |
| |
| if (!ret) { |
| timeout = jiffies; |
| ret = ext4_init_inode_table(sb, group, |
| elr->lr_timeout ? 0 : 1); |
| if (elr->lr_timeout == 0) { |
| timeout = (jiffies - timeout) * |
| elr->lr_sbi->s_li_wait_mult; |
| elr->lr_timeout = timeout; |
| } |
| elr->lr_next_sched = jiffies + elr->lr_timeout; |
| elr->lr_next_group = group + 1; |
| } |
| sb_end_write(sb); |
| |
| return ret; |
| } |
| |
| /* |
| * Remove lr_request from the list_request and free the |
| * request structure. Should be called with li_list_mtx held |
| */ |
| static void ext4_remove_li_request(struct ext4_li_request *elr) |
| { |
| struct ext4_sb_info *sbi; |
| |
| if (!elr) |
| return; |
| |
| sbi = elr->lr_sbi; |
| |
| list_del(&elr->lr_request); |
| sbi->s_li_request = NULL; |
| kfree(elr); |
| } |
| |
| static void ext4_unregister_li_request(struct super_block *sb) |
| { |
| mutex_lock(&ext4_li_mtx); |
| if (!ext4_li_info) { |
| mutex_unlock(&ext4_li_mtx); |
| return; |
| } |
| |
| mutex_lock(&ext4_li_info->li_list_mtx); |
| ext4_remove_li_request(EXT4_SB(sb)->s_li_request); |
| mutex_unlock(&ext4_li_info->li_list_mtx); |
| mutex_unlock(&ext4_li_mtx); |
| } |
| |
| static struct task_struct *ext4_lazyinit_task; |
| |
| /* |
| * This is the function where ext4lazyinit thread lives. It walks |
| * through the request list searching for next scheduled filesystem. |
| * When such a fs is found, run the lazy initialization request |
| * (ext4_rn_li_request) and keep track of the time spend in this |
| * function. Based on that time we compute next schedule time of |
| * the request. When walking through the list is complete, compute |
| * next waking time and put itself into sleep. |
| */ |
| static int ext4_lazyinit_thread(void *arg) |
| { |
| struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg; |
| struct list_head *pos, *n; |
| struct ext4_li_request *elr; |
| unsigned long next_wakeup, cur; |
| |
| BUG_ON(NULL == eli); |
| |
| cont_thread: |
| while (true) { |
| next_wakeup = MAX_JIFFY_OFFSET; |
| |
| mutex_lock(&eli->li_list_mtx); |
| if (list_empty(&eli->li_request_list)) { |
| mutex_unlock(&eli->li_list_mtx); |
| goto exit_thread; |
| } |
| |
| list_for_each_safe(pos, n, &eli->li_request_list) { |
| elr = list_entry(pos, struct ext4_li_request, |
| lr_request); |
| |
| if (time_after_eq(jiffies, elr->lr_next_sched)) { |
| if (ext4_run_li_request(elr) != 0) { |
| /* error, remove the lazy_init job */ |
| ext4_remove_li_request(elr); |
| continue; |
| } |
| } |
| |
| if (time_before(elr->lr_next_sched, next_wakeup)) |
| next_wakeup = elr->lr_next_sched; |
| } |
| mutex_unlock(&eli->li_list_mtx); |
| |
| try_to_freeze(); |
| |
| cur = jiffies; |
| if ((time_after_eq(cur, next_wakeup)) || |
| (MAX_JIFFY_OFFSET == next_wakeup)) { |
| cond_resched(); |
| continue; |
| } |
| |
| schedule_timeout_interruptible(next_wakeup - cur); |
| |
| if (kthread_should_stop()) { |
| ext4_clear_request_list(); |
| goto exit_thread; |
| } |
| } |
| |
| exit_thread: |
| /* |
| * It looks like the request list is empty, but we need |
| * to check it under the li_list_mtx lock, to prevent any |
| * additions into it, and of course we should lock ext4_li_mtx |
| * to atomically free the list and ext4_li_info, because at |
| * this point another ext4 filesystem could be registering |
| * new one. |
| */ |
| mutex_lock(&ext4_li_mtx); |
| mutex_lock(&eli->li_list_mtx); |
| if (!list_empty(&eli->li_request_list)) { |
| mutex_unlock(&eli->li_list_mtx); |
| mutex_unlock(&ext4_li_mtx); |
| goto cont_thread; |
| } |
| mutex_unlock(&eli->li_list_mtx); |
| kfree(ext4_li_info); |
| ext4_li_info = NULL; |
| mutex_unlock(&ext4_li_mtx); |
| |
| return 0; |
| } |
| |
| static void ext4_clear_request_list(void) |
| { |
| struct list_head *pos, *n; |
| struct ext4_li_request *elr; |
| |
| mutex_lock(&ext4_li_info->li_list_mtx); |
| list_for_each_safe(pos, n, &ext4_li_info->li_request_list) { |
| elr = list_entry(pos, struct ext4_li_request, |
| lr_request); |
| ext4_remove_li_request(elr); |
| } |
| mutex_unlock(&ext4_li_info->li_list_mtx); |
| } |
| |
| static int ext4_run_lazyinit_thread(void) |
| { |
| ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread, |
| ext4_li_info, "ext4lazyinit"); |
| if (IS_ERR(ext4_lazyinit_task)) { |
| int err = PTR_ERR(ext4_lazyinit_task); |
| ext4_clear_request_list(); |
| kfree(ext4_li_info); |
| ext4_li_info = NULL; |
| printk(KERN_CRIT "EXT4-fs: error %d creating inode table " |
| "initialization thread\n", |
| err); |
| return err; |
| } |
| ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING; |
| return 0; |
| } |
| |
| /* |
| * Check whether it make sense to run itable init. thread or not. |
| * If there is at least one uninitialized inode table, return |
| * corresponding group number, else the loop goes through all |
| * groups and return total number of groups. |
| */ |
| static ext4_group_t ext4_has_uninit_itable(struct super_block *sb) |
| { |
| ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count; |
| struct ext4_group_desc *gdp = NULL; |
| |
| for (group = 0; group < ngroups; group++) { |
| gdp = ext4_get_group_desc(sb, group, NULL); |
| if (!gdp) |
| continue; |
| |
| if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED))) |
| break; |
| } |
| |
| return group; |
| } |
| |
| static int ext4_li_info_new(void) |
| { |
| struct ext4_lazy_init *eli = NULL; |
| |
| eli = kzalloc(sizeof(*eli), GFP_KERNEL); |
| if (!eli) |
| return -ENOMEM; |
| |
| INIT_LIST_HEAD(&eli->li_request_list); |
| mutex_init(&eli->li_list_mtx); |
| |
| eli->li_state |= EXT4_LAZYINIT_QUIT; |
| |
| ext4_li_info = eli; |
| |
| return 0; |
| } |
| |
| static struct ext4_li_request *ext4_li_request_new(struct super_block *sb, |
| ext4_group_t start) |
| { |
| struct ext4_sb_info *sbi = EXT4_SB(sb); |
| struct ext4_li_request *elr; |
| |
| elr = kzalloc(sizeof(*elr), GFP_KERNEL); |
| if (!elr) |
| return NULL; |
| |
| elr->lr_super = sb; |
| elr->lr_sbi = sbi; |
| elr->lr_next_group = start; |
| |
| /* |
| * Randomize first schedule time of the request to |
| * spread the inode table initialization requests |
| * better. |
| */ |
| elr->lr_next_sched = jiffies + (prandom_u32() % |
| (EXT4_DEF_LI_MAX_START_DELAY * HZ)); |
| return elr; |
| } |
| |
| int ext4_register_li_request(struct super_block *sb, |
| ext4_group_t first_not_zeroed) |
| { |
| struct ext4_sb_info *sbi = EXT4_SB(sb); |
| struct ext4_li_request *elr = NULL; |
| ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; |
| int ret = 0; |
| |
| mutex_lock(&ext4_li_mtx); |
| if (sbi->s_li_request != NULL) { |
| /* |
| * Reset timeout so it can be computed again, because |
| * s_li_wait_mult might have changed. |
| */ |
| sbi->s_li_request->lr_timeout = 0; |
| goto out; |
| } |
| |
| if (first_not_zeroed == ngroups || |
| (sb->s_flags & MS_RDONLY) || |
| !test_opt(sb, INIT_INODE_TABLE)) |
| goto out; |
| |
| elr = ext4_li_request_new(sb, first_not_zeroed); |
| if (!elr) { |
| ret = -ENOMEM; |
| goto out; |
| } |
| |
| if (NULL == ext4_li_info) { |
| ret = ext4_li_info_new(); |
| if (ret) |
| goto out; |
| } |
| |
| mutex_lock(&ext4_li_info->li_list_mtx); |
| list_add(&elr->lr_request, &ext4_li_info->li_request_list); |
| mutex_unlock(&ext4_li_info->li_list_mtx); |
| |
| sbi->s_li_request = elr; |
| /* |
| * set elr to NULL here since it has been inserted to |
| * the request_list and the removal and free of it is |
| * handled by ext4_clear_request_list from now on. |
| */ |
| elr = NULL; |
| |
| if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) { |
| ret = ext4_run_lazyinit_thread(); |
| if (ret) |
| goto out; |
| } |
| out: |
| mutex_unlock(&ext4_li_mtx); |
| if (ret) |
| kfree(elr); |
| return ret; |
| } |
| |
| /* |
| * We do not need to lock anything since this is called on |
| * module unload. |
| */ |
| static void ext4_destroy_lazyinit_thread(void) |
| { |
| /* |
| * If thread exited earlier |
| * there's nothing to be done. |
| */ |
| if (!ext4_li_info || !ext4_lazyinit_task) |
| return; |
| |
| kthread_stop(ext4_lazyinit_task); |
| } |
| |
| static int set_journal_csum_feature_set(struct super_block *sb) |
| { |
| int ret = 1; |
| int compat, incompat; |
| struct ext4_sb_info *sbi = EXT4_SB(sb); |
| |
| if (ext4_has_metadata_csum(sb)) { |
| /* journal checksum v3 */ |
| compat = 0; |
| incompat = JBD2_FEATURE_INCOMPAT_CSUM_V3; |
| } else { |
| /* journal checksum v1 */ |
| compat = JBD2_FEATURE_COMPAT_CHECKSUM; |
| incompat = 0; |
| } |
| |
| jbd2_journal_clear_features(sbi->s_journal, |
| JBD2_FEATURE_COMPAT_CHECKSUM, 0, |
| JBD2_FEATURE_INCOMPAT_CSUM_V3 | |
| JBD2_FEATURE_INCOMPAT_CSUM_V2); |
| if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) { |
| ret = jbd2_journal_set_features(sbi->s_journal, |
| compat, 0, |
| JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT | |
| incompat); |
| } else if (test_opt(sb, JOURNAL_CHECKSUM)) { |
| ret = jbd2_journal_set_features(sbi->s_journal, |
| compat, 0, |
| incompat); |
| jbd2_journal_clear_features(sbi->s_journal, 0, 0, |
| JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT); |
| } else { |
| jbd2_journal_clear_features(sbi->s_journal, 0, 0, |
| JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT); |
| } |
| |
| return ret; |
| } |
| |
| /* |
| * Note: calculating the overhead so we can be compatible with |
| * historical BSD practice is quite difficult in the face of |
| * clusters/bigalloc. This is because multiple metadata blocks from |
| * different block group can end up in the same allocation cluster. |
| * Calculating the exact overhead in the face of clustered allocation |
| * requires either O(all block bitmaps) in memory or O(number of block |
| * groups**2) in time. We will still calculate the superblock for |
| * older file systems --- and if we come across with a bigalloc file |
| * system with zero in s_overhead_clusters the estimate will be close to |
| * correct especially for very large cluster sizes --- but for newer |
| * file systems, it's better to calculate this figure once at mkfs |
| * time, and store it in the superblock. If the superblock value is |
| * present (even for non-bigalloc file systems), we will use it. |
| */ |
| static int count_overhead(struct super_block *sb, ext4_group_t grp, |
| char *buf) |
| { |
| struct ext4_sb_info *sbi = EXT4_SB(sb); |
| struct ext4_group_desc *gdp; |
| ext4_fsblk_t first_block, last_block, b; |
| ext4_group_t i, ngroups = ext4_get_groups_count(sb); |
| int s, j, count = 0; |
| |
| if (!ext4_has_feature_bigalloc(sb)) |
| return (ext4_bg_has_super(sb, grp) + ext4_bg_num_gdb(sb, grp) + |
| sbi->s_itb_per_group + 2); |
| |
| first_block = le32_to_cpu(sbi->s_es->s_first_data_block) + |
| (grp * EXT4_BLOCKS_PER_GROUP(sb)); |
| last_block = first_block + EXT4_BLOCKS_PER_GROUP(sb) - 1; |
| for (i = 0; i < ngroups; i++) { |
| gdp = ext4_get_group_desc(sb, i, NULL); |
| b = ext4_block_bitmap(sb, gdp); |
| if (b >= first_block && b <= last_block) { |
| ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf); |
| count++; |
| } |
| b = ext4_inode_bitmap(sb, gdp); |
| if (b >= first_block && b <= last_block) { |
| ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf); |
| count++; |
| } |
| b = ext4_inode_table(sb, gdp); |
| if (b >= first_block && b + sbi->s_itb_per_group <= last_block) |
| for (j = 0; j < sbi->s_itb_per_group; j++, b++) { |
| int c = EXT4_B2C(sbi, b - first_block); |
| ext4_set_bit(c, buf); |
| count++; |
| } |
| if (i != grp) |
| continue; |
| s = 0; |
| if (ext4_bg_has_super(sb, grp)) { |
| ext4_set_bit(s++, buf); |
| count++; |
| } |
| for (j = ext4_bg_num_gdb(sb, grp); j > 0; j--) { |
| ext4_set_bit(EXT4_B2C(sbi, s++), buf); |
| count++; |
| } |
| } |
| if (!count) |
| return 0; |
| return EXT4_CLUSTERS_PER_GROUP(sb) - |
| ext4_count_free(buf, EXT4_CLUSTERS_PER_GROUP(sb) / 8); |
| } |
| |
| /* |
| * Compute the overhead and stash it in sbi->s_overhead |
| */ |
| int ext4_calculate_overhead(struct super_block *sb) |
| { |
| struct ext4_sb_info *sbi = EXT4_SB(sb); |
| struct ext4_super_block *es = sbi->s_es; |
| ext4_group_t i, ngroups = ext4_get_groups_count(sb); |
| ext4_fsblk_t overhead = 0; |
| char *buf = (char *) get_zeroed_page(GFP_NOFS); |
| |
| if (!buf) |
| return -ENOMEM; |
| |
| /* |
| * Compute the overhead (FS structures). This is constant |
| * for a given filesystem unless the number of block groups |
| * changes so we cache the previous value until it does. |
| */ |
| |
| /* |
| * All of the blocks before first_data_block are overhead |
| */ |
| overhead = EXT4_B2C(sbi, le32_to_cpu(es->s_first_data_block)); |
| |
| /* |
| * Add the overhead found in each block group |
| */ |
| for (i = 0; i < ngroups; i++) { |
| int blks; |
| |
| blks = count_overhead(sb, i, buf); |
| overhead += blks; |
| if (blks) |
| memset(buf, 0, PAGE_SIZE); |
| cond_resched(); |
| } |
| /* Add the internal journal blocks as well */ |
| if (sbi->s_journal && !sbi->journal_bdev) |
| overhead += EXT4_NUM_B2C(sbi, sbi->s_journal->j_maxlen); |
| |
| sbi->s_overhead = overhead; |
| smp_wmb(); |
| free_page((unsigned long) buf); |
| return 0; |
| } |
| |
| static void ext4_set_resv_clusters(struct super_block *sb) |
| { |
| ext4_fsblk_t resv_clusters; |
| struct ext4_sb_info *sbi = EXT4_SB(sb); |
| |
| /* |
| * There's no need to reserve anything when we aren't using extents. |
| * The space estimates are exact, there are no unwritten extents, |
| * hole punching doesn't need new metadata... This is needed especially |
| * to keep ext2/3 backward compatibility. |
| */ |
| if (!ext4_has_feature_extents(sb)) |
| return; |
| /* |
| * By default we reserve 2% or 4096 clusters, whichever is smaller. |
| * This should cover the situations where we can not afford to run |
| * out of space like for example punch hole, or converting |
| * unwritten extents in delalloc path. In most cases such |
| * allocation would require 1, or 2 blocks, higher numbers are |
| * very rare. |
| */ |
| resv_clusters = (ext4_blocks_count(sbi->s_es) >> |
| sbi->s_cluster_bits); |
| |
| do_div(resv_clusters, 50); |
| resv_clusters = min_t(ext4_fsblk_t, resv_clusters, 4096); |
| |
| atomic64_set(&sbi->s_resv_clusters, resv_clusters); |
| } |
| |
| static int ext4_fill_super(struct super_block *sb, void *data, int silent) |
| { |
| char *orig_data = kstrdup(data, GFP_KERNEL); |
| struct buffer_head *bh; |
| struct ext4_super_block *es = NULL; |
| struct ext4_sb_info *sbi; |
| ext4_fsblk_t block; |
| ext4_fsblk_t sb_block = get_sb_block(&data); |
| ext4_fsblk_t logical_sb_block; |
| unsigned long offset = 0; |
| unsigned long journal_devnum = 0; |
| unsigned long def_mount_opts; |
| struct inode *root; |
| const char *descr; |
| int ret = -ENOMEM; |
| int blocksize, clustersize; |
| unsigned int db_count; |
| unsigned int i; |
| int needs_recovery, has_huge_files, has_bigalloc; |
| __u64 blocks_count; |
| int err = 0; |
| unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO; |
| ext4_group_t first_not_zeroed; |
| |
| sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); |
| if (!sbi) |
| goto out_free_orig; |
| |
| sbi->s_blockgroup_lock = |
| kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL); |
| if (!sbi->s_blockgroup_lock) { |
| kfree(sbi); |
| goto out_free_orig; |
| } |
| sb->s_fs_info = sbi; |
| sbi->s_sb = sb; |
| sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS; |
| sbi->s_sb_block = sb_block; |
| if (sb->s_bdev->bd_part) |
| sbi->s_sectors_written_start = |
| part_stat_read(sb->s_bdev->bd_part, sectors[1]); |
| |
| /* Cleanup superblock name */ |
| strreplace(sb->s_id, '/', '!'); |
| |
| /* -EINVAL is default */ |
| ret = -EINVAL; |
| blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE); |
| if (!blocksize) { |
| ext4_msg(sb, KERN_ERR, "unable to set blocksize"); |
| goto out_fail; |
| } |
| |
| /* |
| * The ext4 superblock will not be buffer aligned for other than 1kB |
| * block sizes. We need to calculate the offset from buffer start. |
| */ |
| if (blocksize != EXT4_MIN_BLOCK_SIZE) { |
| logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE; |
| offset = do_div(logical_sb_block, blocksize); |
| } else { |
| logical_sb_block = sb_block; |
| } |
| |
| if (!(bh = sb_bread_unmovable(sb, logical_sb_block))) { |
| ext4_msg(sb, KERN_ERR, "unable to read superblock"); |
| goto out_fail; |
| } |
| /* |
| * Note: s_es must be initialized as soon as possible because |
| * some ext4 macro-instructions depend on its value |
| */ |
| es = (struct ext4_super_block *) (bh->b_data + offset); |
| sbi->s_es = es; |
| sb->s_magic = le16_to_cpu(es->s_magic); |
| if (sb->s_magic != EXT4_SUPER_MAGIC) |
| goto cantfind_ext4; |
| sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written); |
| |
| /* Warn if metadata_csum and gdt_csum are both set. */ |
| if (ext4_has_feature_metadata_csum(sb) && |
| ext4_has_feature_gdt_csum(sb)) |
| ext4_warning(sb, "metadata_csum and uninit_bg are " |
| "redundant flags; please run fsck."); |
| |
| /* Check for a known checksum algorithm */ |
| if (!ext4_verify_csum_type(sb, es)) { |
| ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with " |
| "unknown checksum algorithm."); |
| silent = 1; |
| goto cantfind_ext4; |
| } |
| |
| /* Load the checksum driver */ |
| if (ext4_has_feature_metadata_csum(sb)) { |
| sbi->s_chksum_driver = crypto_alloc_shash("crc32c", 0, 0); |
| if (IS_ERR(sbi->s_chksum_driver)) { |
| ext4_msg(sb, KERN_ERR, "Cannot load crc32c driver."); |
| ret = PTR_ERR(sbi->s_chksum_driver); |
| sbi->s_chksum_driver = NULL; |
| goto failed_mount; |
| } |
| } |
| |
| /* Check superblock checksum */ |
| if (!ext4_superblock_csum_verify(sb, es)) { |
| ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with " |
| "invalid superblock checksum. Run e2fsck?"); |
| silent = 1; |
| ret = -EFSBADCRC; |
| goto cantfind_ext4; |
| } |
| |
| /* Precompute checksum seed for all metadata */ |
| if (ext4_has_feature_csum_seed(sb)) |
| sbi->s_csum_seed = le32_to_cpu(es->s_checksum_seed); |
| else if (ext4_has_metadata_csum(sb)) |
| sbi->s_csum_seed = ext4_chksum(sbi, ~0, es->s_uuid, |
| sizeof(es->s_uuid)); |
| |
| /* Set defaults before we parse the mount options */ |
| def_mount_opts = le32_to_cpu(es->s_default_mount_opts); |
| set_opt(sb, INIT_INODE_TABLE); |
| if (def_mount_opts & EXT4_DEFM_DEBUG) |
| set_opt(sb, DEBUG); |
| if (def_mount_opts & EXT4_DEFM_BSDGROUPS) |
| set_opt(sb, GRPID); |
| if (def_mount_opts & EXT4_DEFM_UID16) |
| set_opt(sb, NO_UID32); |
| /* xattr user namespace & acls are now defaulted on */ |
| set_opt(sb, XATTR_USER); |
| #ifdef CONFIG_EXT4_FS_POSIX_ACL |
| set_opt(sb, POSIX_ACL); |
| #endif |
| /* don't forget to enable journal_csum when metadata_csum is enabled. */ |
| if (ext4_has_metadata_csum(sb)) |
| set_opt(sb, JOURNAL_CHECKSUM); |
| |
| if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA) |
| set_opt(sb, JOURNAL_DATA); |
| else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED) |
| set_opt(sb, ORDERED_DATA); |
| else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK) |
| set_opt(sb, WRITEBACK_DATA); |
| |
| if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC) |
| set_opt(sb, ERRORS_PANIC); |
| else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE) |
| set_opt(sb, ERRORS_CONT); |
| else |
| set_opt(sb, ERRORS_RO); |
| /* block_validity enabled by default; disable with noblock_validity */ |
| set_opt(sb, BLOCK_VALIDITY); |
| if (def_mount_opts & EXT4_DEFM_DISCARD) |
| set_opt(sb, DISCARD); |
| |
| sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid)); |
| sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid)); |
| sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ; |
| sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME; |
| sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME; |
| |
| if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0) |
| set_opt(sb, BARRIER); |
| |
| /* |
| * enable delayed allocation by default |
| * Use -o nodelalloc to turn it off |
| */ |
| if (!IS_EXT3_SB(sb) && !IS_EXT2_SB(sb) && |
| ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0)) |
| set_opt(sb, DELALLOC); |
| |
| /* |
| * set default s_li_wait_mult for lazyinit, for the case there is |
| * no mount option specified. |
| */ |
| sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT; |
| |
| if (!parse_options((char *) sbi->s_es->s_mount_opts, sb, |
| &journal_devnum, &journal_ioprio, 0)) { |
| ext4_msg(sb, KERN_WARNING, |
| "failed to parse options in superblock: %s", |
| sbi->s_es->s_mount_opts); |
| } |
| sbi->s_def_mount_opt = sbi->s_mount_opt; |
| if (!parse_options((char *) data, sb, &journal_devnum, |
| &journal_ioprio, 0)) |
| goto failed_mount; |
| |
| if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) { |
| printk_once(KERN_WARNING "EXT4-fs: Warning: mounting " |
| "with data=journal disables delayed " |
| "allocation and O_DIRECT support!\n"); |
| if (test_opt2(sb, EXPLICIT_DELALLOC)) { |
| ext4_msg(sb, KERN_ERR, "can't mount with " |
| "both data=journal and delalloc"); |
| goto failed_mount; |
| } |
| if (test_opt(sb, DIOREAD_NOLOCK)) { |
| ext4_msg(sb, KERN_ERR, "can't mount with " |
| "both data=journal and dioread_nolock"); |
| goto failed_mount; |
| } |
| if (test_opt(sb, DAX)) { |
| ext4_msg(sb, KERN_ERR, "can't mount with " |
| "both data=journal and dax"); |
| goto failed_mount; |
| } |
| if (test_opt(sb, DELALLOC)) |
| clear_opt(sb, DELALLOC); |
| } else { |
| sb->s_iflags |= SB_I_CGROUPWB; |
| } |
| |
| sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | |
| (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0); |
| |
| if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV && |
| (ext4_has_compat_features(sb) || |
| ext4_has_ro_compat_features(sb) || |
| ext4_has_incompat_features(sb))) |
| ext4_msg(sb, KERN_WARNING, |
| "feature flags set on rev 0 fs, " |
| "running e2fsck is recommended"); |
| |
| if (es->s_creator_os == cpu_to_le32(EXT4_OS_HURD)) { |
| set_opt2(sb, HURD_COMPAT); |
| if (ext4_has_feature_64bit(sb)) { |
| ext4_msg(sb, KERN_ERR, |
| "The Hurd can't support 64-bit file systems"); |
| goto failed_mount; |
| } |
| } |
| |
| if (IS_EXT2_SB(sb)) { |
| if (ext2_feature_set_ok(sb)) |
| ext4_msg(sb, KERN_INFO, "mounting ext2 file system " |
| "using the ext4 subsystem"); |
| else { |
| ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due " |
| "to feature incompatibilities"); |
| goto failed_mount; |
| } |
| } |
| |
| if (IS_EXT3_SB(sb)) { |
| if (ext3_feature_set_ok(sb)) |
| ext4_msg(sb, KERN_INFO, "mounting ext3 file system " |
| "using the ext4 subsystem"); |
| else { |
| ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due " |
| "to feature incompatibilities"); |
| goto failed_mount; |
| } |
| } |
| |
| /* |
| * Check feature flags regardless of the revision level, since we |
| * previously didn't change the revision level when setting the flags, |
| * so there is a chance incompat flags are set on a rev 0 filesystem. |
| */ |
| if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY))) |
| goto failed_mount; |
| |
| blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size); |
| if (blocksize < EXT4_MIN_BLOCK_SIZE || |
| blocksize > EXT4_MAX_BLOCK_SIZE) { |
| ext4_msg(sb, KERN_ERR, |
| "Unsupported filesystem blocksize %d", blocksize); |
| goto failed_mount; |
| } |
| |
| if (sbi->s_mount_opt & EXT4_MOUNT_DAX) { |
| if (blocksize != PAGE_SIZE) { |
| ext4_msg(sb, KERN_ERR, |
| "error: unsupported blocksize for dax"); |
| goto failed_mount; |
| } |
| if (!sb->s_bdev->bd_disk->fops->direct_access) { |
| ext4_msg(sb, KERN_ERR, |
| "error: device does not support dax"); |
| goto failed_mount; |
| } |
| } |
| |
| if (ext4_has_feature_encrypt(sb) && es->s_encryption_level) { |
| ext4_msg(sb, KERN_ERR, "Unsupported encryption level %d", |
| es->s_encryption_level); |
| goto failed_mount; |
| } |
| |
| if (sb->s_blocksize != blocksize) { |
| /* Validate the filesystem blocksize */ |
| if (!sb_set_blocksize(sb, blocksize)) { |
| ext4_msg(sb, KERN_ERR, "bad block size %d", |
| blocksize); |
| goto failed_mount; |
| } |
| |
| brelse(bh); |
| logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE; |
| offset = do_div(logical_sb_block, blocksize); |
| bh = sb_bread_unmovable(sb, logical_sb_block); |
| if (!bh) { |
| ext4_msg(sb, KERN_ERR, |
| "Can't read superblock on 2nd try"); |
| goto failed_mount; |
| } |
| es = (struct ext4_super_block *)(bh->b_data + offset); |
| sbi->s_es = es; |
| if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) { |
| ext4_msg(sb, KERN_ERR, |
| "Magic mismatch, very weird!"); |
| goto failed_mount; |
| } |
| } |
| |
| has_huge_files = ext4_has_feature_huge_file(sb); |
| sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits, |
| has_huge_files); |
| sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files); |
| |
| if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) { |
| sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE; |
| sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO; |
| } else { |
| sbi->s_inode_size = le16_to_cpu(es->s_inode_size); |
| sbi->s_first_ino = le32_to_cpu(es->s_first_ino); |
| if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) || |
| (!is_power_of_2(sbi->s_inode_size)) || |
| (sbi->s_inode_size > blocksize)) { |
| ext4_msg(sb, KERN_ERR, |
| "unsupported inode size: %d", |
| sbi->s_inode_size); |
| goto failed_mount; |
| } |
| if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) |
| sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2); |
| } |
| |
| sbi->s_desc_size = le16_to_cpu(es->s_desc_size); |
| if (ext4_has_feature_64bit(sb)) { |
| if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT || |
| sbi->s_desc_size > EXT4_MAX_DESC_SIZE || |
| !is_power_of_2(sbi->s_desc_size)) { |
| ext4_msg(sb, KERN_ERR, |
| "unsupported descriptor size %lu", |
| sbi->s_desc_size); |
| goto failed_mount; |
| } |
| } else |
| sbi->s_desc_size = EXT4_MIN_DESC_SIZE; |
| |
| sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group); |
| sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group); |
| if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0) |
| goto cantfind_ext4; |
| |
| sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb); |
| if (sbi->s_inodes_per_block == 0) |
| goto cantfind_ext4; |
| sbi->s_itb_per_group = sbi->s_inodes_per_group / |
| sbi->s_inodes_per_block; |
| sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb); |
| sbi->s_sbh = bh; |
| sbi->s_mount_state = le16_to_cpu(es->s_state); |
| sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb)); |
| sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb)); |
| |
| for (i = 0; i < 4; i++) |
| sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]); |
| sbi->s_def_hash_version = es->s_def_hash_version; |
| if (ext4_has_feature_dir_index(sb)) { |
| i = le32_to_cpu(es->s_flags); |
| if (i & EXT2_FLAGS_UNSIGNED_HASH) |
| sbi->s_hash_unsigned = 3; |
| else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) { |
| #ifdef __CHAR_UNSIGNED__ |
| if (!(sb->s_flags & MS_RDONLY)) |
| es->s_flags |= |
| cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH); |
| sbi->s_hash_unsigned = 3; |
| #else |
| if (!(sb->s_flags & MS_RDONLY)) |
| es->s_flags |= |
| cpu_to_le32(EXT2_FLAGS_SIGNED_HASH); |
| #endif |
| } |
| } |
| |
| /* Handle clustersize */ |
| clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size); |
| has_bigalloc = ext4_has_feature_bigalloc(sb); |
| if (has_bigalloc) { |
| if (clustersize < blocksize) { |
| ext4_msg(sb, KERN_ERR, |
| "cluster size (%d) smaller than " |
| "block size (%d)", clustersize, blocksize); |
| goto failed_mount; |
| } |
| sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) - |
| le32_to_cpu(es->s_log_block_size); |
| sbi->s_clusters_per_group = |
| le32_to_cpu(es->s_clusters_per_group); |
| if (sbi->s_clusters_per_group > blocksize * 8) { |
| ext4_msg(sb, KERN_ERR, |
| "#clusters per group too big: %lu", |
| sbi->s_clusters_per_group); |
| goto failed_mount; |
| } |
| if (sbi->s_blocks_per_group != |
| (sbi->s_clusters_per_group * (clustersize / blocksize))) { |
| ext4_msg(sb, KERN_ERR, "blocks per group (%lu) and " |
| "clusters per group (%lu) inconsistent", |
| sbi->s_blocks_per_group, |
| sbi->s_clusters_per_group); |
| goto failed_mount; |
| } |
| } else { |
| if (clustersize != blocksize) { |
| ext4_warning(sb, "fragment/cluster size (%d) != " |
| "block size (%d)", clustersize, |
| blocksize); |
| clustersize = blocksize; |
| } |
| if (sbi->s_blocks_per_group > blocksize * 8) { |
| ext4_msg(sb, KERN_ERR, |
| "#blocks per group too big: %lu", |
| sbi->s_blocks_per_group); |
| goto failed_mount; |
| } |
| sbi->s_clusters_per_group = sbi->s_blocks_per_group; |
| sbi->s_cluster_bits = 0; |
| } |
| sbi->s_cluster_ratio = clustersize / blocksize; |
| |
| if (sbi->s_inodes_per_group > blocksize * 8) { |
| ext4_msg(sb, KERN_ERR, |
| "#inodes per group too big: %lu", |
| sbi->s_inodes_per_group); |
| goto failed_mount; |
| } |
| |
| /* Do we have standard group size of clustersize * 8 blocks ? */ |
| if (sbi->s_blocks_per_group == clustersize << 3) |
| set_opt2(sb, STD_GROUP_SIZE); |
| |
| /* |
| * Test whether we have more sectors than will fit in sector_t, |
| * and whether the max offset is addressable by the page cache. |
| */ |
| err = generic_check_addressable(sb->s_blocksize_bits, |
| ext4_blocks_count(es)); |
| if (err) { |
| ext4_msg(sb, KERN_ERR, "filesystem" |
| " too large to mount safely on this system"); |
| if (sizeof(sector_t) < 8) |
| ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled"); |
| goto failed_mount; |
| } |
| |
| if (EXT4_BLOCKS_PER_GROUP(sb) == 0) |
| goto cantfind_ext4; |
| |
| /* check blocks count against device size */ |
| blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits; |
| if (blocks_count && ext4_blocks_count(es) > blocks_count) { |
| ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu " |
| "exceeds size of device (%llu blocks)", |
| ext4_blocks_count(es), blocks_count); |
| goto failed_mount; |
| } |
| |
| /* |
| * It makes no sense for the first data block to be beyond the end |
| * of the filesystem. |
| */ |
| if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) { |
| ext4_msg(sb, KERN_WARNING, "bad geometry: first data " |
| "block %u is beyond end of filesystem (%llu)", |
| le32_to_cpu(es->s_first_data_block), |
| ext4_blocks_count(es)); |
| goto failed_mount; |
| } |
| blocks_count = (ext4_blocks_count(es) - |
| le32_to_cpu(es->s_first_data_block) + |
| EXT4_BLOCKS_PER_GROUP(sb) - 1); |
| do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb)); |
| if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) { |
| ext4_msg(sb, KERN_WARNING, "groups count too large: %u " |
| "(block count %llu, first data block %u, " |
| "blocks per group %lu)", sbi->s_groups_count, |
| ext4_blocks_count(es), |
| le32_to_cpu(es->s_first_data_block), |
| EXT4_BLOCKS_PER_GROUP(sb)); |
| goto failed_mount; |
| } |
| sbi->s_groups_count = blocks_count; |
| sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count, |
| (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb))); |
| db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) / |
| EXT4_DESC_PER_BLOCK(sb); |
| sbi->s_group_desc = ext4_kvmalloc(db_count * |
| sizeof(struct buffer_head *), |
| GFP_KERNEL); |
| if (sbi->s_group_desc == NULL) { |
| ext4_msg(sb, KERN_ERR, "not enough memory"); |
| ret = -ENOMEM; |
| goto failed_mount; |
| } |
| |
| bgl_lock_init(sbi->s_blockgroup_lock); |
| |
| for (i = 0; i < db_count; i++) { |
| block = descriptor_loc(sb, logical_sb_block, i); |
| sbi->s_group_desc[i] = sb_bread_unmovable(sb, block); |
| if (!sbi->s_group_desc[i]) { |
| ext4_msg(sb, KERN_ERR, |
| "can't read group descriptor %d", i); |
| db_count = i; |
| goto failed_mount2; |
| } |
| } |
| if (!ext4_check_descriptors(sb, &first_not_zeroed)) { |
| ext4_msg(sb, KERN_ERR, "group descriptors corrupted!"); |
| ret = -EFSCORRUPTED; |
| goto failed_mount2; |
| } |
| |
| sbi->s_gdb_count = db_count; |
| get_random_bytes(&sbi->s_next_generation, sizeof(u32)); |
| spin_lock_init(&sbi->s_next_gen_lock); |
| |
| setup_timer(&sbi->s_err_report, print_daily_error_info, |
| (unsigned long) sb); |
| |
| /* Register extent status tree shrinker */ |
| if (ext4_es_register_shrinker(sbi)) |
| goto failed_mount3; |
| |
| sbi->s_stripe = ext4_get_stripe_size(sbi); |
| sbi->s_extent_max_zeroout_kb = 32; |
| |
| /* |
| * set up enough so that it can read an inode |
| */ |
| sb->s_op = &ext4_sops; |
| sb->s_export_op = &ext4_export_ops; |
| sb->s_xattr = ext4_xattr_handlers; |
| #ifdef CONFIG_QUOTA |
| sb->dq_op = &ext4_quota_operations; |
| if (ext4_has_feature_quota(sb)) |
| sb->s_qcop = &dquot_quotactl_sysfile_ops; |
| else |
| sb->s_qcop = &ext4_qctl_operations; |
| sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ; |
| #endif |
| memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid)); |
| |
| INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */ |
| mutex_init(&sbi->s_orphan_lock); |
| |
| sb->s_root = NULL; |
| |
| needs_recovery = (es->s_last_orphan != 0 || |
| ext4_has_feature_journal_needs_recovery(sb)); |
| |
| if (ext4_has_feature_mmp(sb) && !(sb->s_flags & MS_RDONLY)) |
| if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block))) |
| goto failed_mount3a; |
| |
| /* |
| * The first inode we look at is the journal inode. Don't try |
| * root first: it may be modified in the journal! |
| */ |
| if (!test_opt(sb, NOLOAD) && ext4_has_feature_journal(sb)) { |
| if (ext4_load_journal(sb, es, journal_devnum)) |
| goto failed_mount3a; |
| } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) && |
| ext4_has_feature_journal_needs_recovery(sb)) { |
| ext4_msg(sb, KERN_ERR, "required journal recovery " |
| "suppressed and not mounted read-only"); |
| goto failed_mount_wq; |
| } else { |
| /* Nojournal mode, all journal mount options are illegal */ |
| if (test_opt2(sb, EXPLICIT_JOURNAL_CHECKSUM)) { |
| ext4_msg(sb, KERN_ERR, "can't mount with " |
| "journal_checksum, fs mounted w/o journal"); |
| goto failed_mount_wq; |
| } |
| if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) { |
| ext4_msg(sb, KERN_ERR, "can't mount with " |
| "journal_async_commit, fs mounted w/o journal"); |
| goto failed_mount_wq; |
| } |
| if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) { |
| ext4_msg(sb, KERN_ERR, "can't mount with " |
| "commit=%lu, fs mounted w/o journal", |
| sbi->s_commit_interval / HZ); |
| goto failed_mount_wq; |
| } |
| if (EXT4_MOUNT_DATA_FLAGS & |
| (sbi->s_mount_opt ^ sbi->s_def_mount_opt)) { |
| ext4_msg(sb, KERN_ERR, "can't mount with " |
| "data=, fs mounted w/o journal"); |
| goto failed_mount_wq; |
| } |
| sbi->s_def_mount_opt &= EXT4_MOUNT_JOURNAL_CHECKSUM; |
| clear_opt(sb, JOURNAL_CHECKSUM); |
| clear_opt(sb, DATA_FLAGS); |
| sbi->s_journal = NULL; |
| needs_recovery = 0; |
| goto no_journal; |
| } |
| |
| if (ext4_has_feature_64bit(sb) && |
| !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0, |
| JBD2_FEATURE_INCOMPAT_64BIT)) { |
| ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature"); |
| goto failed_mount_wq; |
| } |
| |
| if (!set_journal_csum_feature_set(sb)) { |
| ext4_msg(sb, KERN_ERR, "Failed to set journal checksum " |
| "feature set"); |
| goto failed_mount_wq; |
| } |
| |
| /* We have now updated the journal if required, so we can |
| * validate the data journaling mode. */ |
| switch (test_opt(sb, DATA_FLAGS)) { |
| case 0: |
| /* No mode set, assume a default based on the journal |
| * capabilities: ORDERED_DATA if the journal can |
| * cope, else JOURNAL_DATA |
| */ |
| if (jbd2_journal_check_available_features |
| (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) |
| set_opt(sb, ORDERED_DATA); |
| else |
| set_opt(sb, JOURNAL_DATA); |
| break; |
| |
| case EXT4_MOUNT_ORDERED_DATA: |
| case EXT4_MOUNT_WRITEBACK_DATA: |
| if (!jbd2_journal_check_available_features |
| (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) { |
| ext4_msg(sb, KERN_ERR, "Journal does not support " |
| "requested data journaling mode"); |
| goto failed_mount_wq; |
| } |
| default: |
| break; |
| } |
| set_task_ioprio(sbi->s_journal->j_task, journal_ioprio); |
| |
| sbi->s_journal->j_commit_callback = ext4_journal_commit_callback; |
| |
| no_journal: |
| sbi->s_mb_cache = ext4_xattr_create_cache(); |
| if (!sbi->s_mb_cache) { |
| ext4_msg(sb, KERN_ERR, "Failed to create an mb_cache"); |
| goto failed_mount_wq; |
| } |
| |
| if ((DUMMY_ENCRYPTION_ENABLED(sbi) || ext4_has_feature_encrypt(sb)) && |
| (blocksize != PAGE_CACHE_SIZE)) { |
| ext4_msg(sb, KERN_ERR, |
| "Unsupported blocksize for fs encryption"); |
| goto failed_mount_wq; |
| } |
| |
| if (DUMMY_ENCRYPTION_ENABLED(sbi) && !(sb->s_flags & MS_RDONLY) && |
| !ext4_has_feature_encrypt(sb)) { |
| ext4_set_feature_encrypt(sb); |
| ext4_commit_super(sb, 1); |
| } |
| |
| /* |
| * Get the # of file system overhead blocks from the |
| * superblock if present. |
| */ |
| if (es->s_overhead_clusters) |
| sbi->s_overhead = le32_to_cpu(es->s_overhead_clusters); |
| else { |
| err = ext4_calculate_overhead(sb); |
| if (err) |
| goto failed_mount_wq; |
| } |
| |
| /* |
| * The maximum number of concurrent works can be high and |
| * concurrency isn't really necessary. Limit it to 1. |
| */ |
| EXT4_SB(sb)->rsv_conversion_wq = |
| alloc_workqueue("ext4-rsv-conversion", WQ_MEM_RECLAIM | WQ_UNBOUND, 1); |
| if (!EXT4_SB(sb)->rsv_conversion_wq) { |
| printk(KERN_ERR "EXT4-fs: failed to create workqueue\n"); |
| ret = -ENOMEM; |
| goto failed_mount4; |
| } |
| |
| /* |
| * The jbd2_journal_load will have done any necessary log recovery, |
| * so we can safely mount the rest of the filesystem now. |
| */ |
| |
| root = ext4_iget(sb, EXT4_ROOT_INO); |
| if (IS_ERR(root)) { |
| ext4_msg(sb, KERN_ERR, "get root inode failed"); |
| ret = PTR_ERR(root); |
| root = NULL; |
| goto failed_mount4; |
| } |
| if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { |
| ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck"); |
| iput(root); |
| goto failed_mount4; |
| } |
| sb->s_root = d_make_root(root); |
| if (!sb->s_root) { |
| ext4_msg(sb, KERN_ERR, "get root dentry failed"); |
| ret = -ENOMEM; |
| goto failed_mount4; |
| } |
| |
| if (ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY)) |
| sb->s_flags |= MS_RDONLY; |
| |
| /* determine the minimum size of new large inodes, if present */ |
| if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) { |
| sbi->s_want_extra_isize = sizeof(struct ext4_inode) - |
| EXT4_GOOD_OLD_INODE_SIZE; |
| if (ext4_has_feature_extra_isize(sb)) { |
| if (sbi->s_want_extra_isize < |
| le16_to_cpu(es->s_want_extra_isize)) |
| sbi->s_want_extra_isize = |
| le16_to_cpu(es->s_want_extra_isize); |
| if (sbi->s_want_extra_isize < |
| le16_to_cpu(es->s_min_extra_isize)) |
| sbi->s_want_extra_isize = |
| le16_to_cpu(es->s_min_extra_isize); |
| } |
| } |
| /* Check if enough inode space is available */ |
| if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize > |
| sbi->s_inode_size) { |
| sbi->s_want_extra_isize = sizeof(struct ext4_inode) - |
| EXT4_GOOD_OLD_INODE_SIZE; |
| ext4_msg(sb, KERN_INFO, "required extra inode space not" |
| "available"); |
| } |
| |
| ext4_set_resv_clusters(sb); |
| |
| err = ext4_setup_system_zone(sb); |
| if (err) { |
| ext4_msg(sb, KERN_ERR, "failed to initialize system " |
| "zone (%d)", err); |
| goto failed_mount4a; |
| } |
| |
| ext4_ext_init(sb); |
| err = ext4_mb_init(sb); |
| if (err) { |
| ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)", |
| err); |
| goto failed_mount5; |
| } |
| |
| block = ext4_count_free_clusters(sb); |
| ext4_free_blocks_count_set(sbi->s_es, |
| EXT4_C2B(sbi, block)); |
| err = percpu_counter_init(&sbi->s_freeclusters_counter, block, |
| GFP_KERNEL); |
| if (!err) { |
| unsigned long freei = ext4_count_free_inodes(sb); |
| sbi->s_es->s_free_inodes_count = cpu_to_le32(freei); |
| err = percpu_counter_init(&sbi->s_freeinodes_counter, freei, |
| GFP_KERNEL); |
| } |
| if (!err) |
| err = percpu_counter_init(&sbi->s_dirs_counter, |
| ext4_count_dirs(sb), GFP_KERNEL); |
| if (!err) |
| err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0, |
| GFP_KERNEL); |
| if (err) { |
| ext4_msg(sb, KERN_ERR, "insufficient memory"); |
| goto failed_mount6; |
| } |
| |
| if (ext4_has_feature_flex_bg(sb)) |
| if (!ext4_fill_flex_info(sb)) { |
| ext4_msg(sb, KERN_ERR, |
| "unable to initialize " |
| "flex_bg meta info!"); |
| goto failed_mount6; |
| } |
| |
| err = ext4_register_li_request(sb, first_not_zeroed); |
| if (err) |
| goto failed_mount6; |
| |
| err = ext4_register_sysfs(sb); |
| if (err) |
| goto failed_mount7; |
| |
| #ifdef CONFIG_QUOTA |
| /* Enable quota usage during mount. */ |
| if (ext4_has_feature_quota(sb) && !(sb->s_flags & MS_RDONLY)) { |
| err = ext4_enable_quotas(sb); |
| if (err) |
| goto failed_mount8; |
| } |
| #endif /* CONFIG_QUOTA */ |
| |
| EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS; |
| ext4_orphan_cleanup(sb, es); |
| EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS; |
| if (needs_recovery) { |
| ext4_msg(sb, KERN_INFO, "recovery complete"); |
| ext4_mark_recovery_complete(sb, es); |
| } |
| if (EXT4_SB(sb)->s_journal) { |
| if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) |
| descr = " journalled data mode"; |
| else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) |
| descr = " ordered data mode"; |
| else |
| descr = " writeback data mode"; |
| } else |
| descr = "out journal"; |
| |
| if (test_opt(sb, DISCARD)) { |
| struct request_queue *q = bdev_get_queue(sb->s_bdev); |
| if (!blk_queue_discard(q)) |
| ext4_msg(sb, KERN_WARNING, |
| "mounting with \"discard\" option, but " |
| "the device does not support discard"); |
| } |
| |
| if (___ratelimit(&ext4_mount_msg_ratelimit, "EXT4-fs mount")) |
| ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. " |
| "Opts: %s%s%s", descr, sbi->s_es->s_mount_opts, |
| *sbi->s_es->s_mount_opts ? "; " : "", orig_data); |
| |
| if (es->s_error_count) |
| mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */ |
| |
| /* Enable message ratelimiting. Default is 10 messages per 5 secs. */ |
| ratelimit_state_init(&sbi->s_err_ratelimit_state, 5 * HZ, 10); |
| ratelimit_state_init(&sbi->s_warning_ratelimit_state, 5 * HZ, 10); |
| ratelimit_state_init(&sbi->s_msg_ratelimit_state, 5 * HZ, 10); |
| |
| kfree(orig_data); |
| return 0; |
| |
| cantfind_ext4: |
| if (!silent) |
| ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem"); |
| goto failed_mount; |
| |
| #ifdef CONFIG_QUOTA |
| failed_mount8: |
| ext4_unregister_sysfs(sb); |
| #endif |
| failed_mount7: |
| ext4_unregister_li_request(sb); |
| failed_mount6: |
| ext4_mb_release(sb); |
| if (sbi->s_flex_groups) |
| kvfree(sbi->s_flex_groups); |
| percpu_counter_destroy(&sbi->s_freeclusters_counter); |
| percpu_counter_destroy(&sbi->s_freeinodes_counter); |
| percpu_counter_destroy(&sbi->s_dirs_counter); |
| percpu_counter_destroy(&sbi->s_dirtyclusters_counter); |
| failed_mount5: |
| ext4_ext_release(sb); |
| ext4_release_system_zone(sb); |
| failed_mount4a: |
| dput(sb->s_root); |
| sb->s_root = NULL; |
| failed_mount4: |
| ext4_msg(sb, KERN_ERR, "mount failed"); |
| if (EXT4_SB(sb)->rsv_conversion_wq) |
| destroy_workqueue(EXT4_SB(sb)->rsv_conversion_wq); |
| failed_mount_wq: |
| if (sbi->s_mb_cache) { |
| ext4_xattr_destroy_cache(sbi->s_mb_cache); |
| sbi->s_mb_cache = NULL; |
| } |
| if (sbi->s_journal) { |
| jbd2_journal_destroy(sbi->s_journal); |
| sbi->s_journal = NULL; |
| } |
| failed_mount3a: |
| ext4_es_unregister_shrinker(sbi); |
| failed_mount3: |
| del_timer_sync(&sbi->s_err_report); |
| if (sbi->s_mmp_tsk) |
| kthread_stop(sbi->s_mmp_tsk); |
| failed_mount2: |
| for (i = 0; i < db_count; i++) |
| brelse(sbi->s_group_desc[i]); |
| kvfree(sbi->s_group_desc); |
| failed_mount: |
| if (sbi->s_chksum_driver) |
| crypto_free_shash(sbi->s_chksum_driver); |
| #ifdef CONFIG_QUOTA |
| for (i = 0; i < EXT4_MAXQUOTAS; i++) |
| kfree(sbi->s_qf_names[i]); |
| #endif |
| ext4_blkdev_remove(sbi); |
| brelse(bh); |
| out_fail: |
| sb->s_fs_info = NULL; |
| kfree(sbi->s_blockgroup_lock); |
| kfree(sbi); |
| out_free_orig: |
| kfree(orig_data); |
| return err ? err : ret; |
| } |
| |
| /* |
| * Setup any per-fs journal parameters now. We'll do this both on |
| * initial mount, once the journal has been initialised but before we've |
| * done any recovery; and again on any subsequent remount. |
| */ |
| static void ext4_init_journal_params(struct super_block *sb, journal_t *journal) |
| { |
| struct ext4_sb_info *sbi = EXT4_SB(sb); |
| |
| journal->j_commit_interval = sbi->s_commit_interval; |
| journal->j_min_batch_time = sbi->s_min_batch_time; |
| journal->j_max_batch_time = sbi->s_max_batch_time; |
| |
| write_lock(&journal->j_state_lock); |
| if (test_opt(sb, BARRIER)) |
| journal->j_flags |= JBD2_BARRIER; |
| else |
| journal->j_flags &= ~JBD2_BARRIER; |
| if (test_opt(sb, DATA_ERR_ABORT)) |
| journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR; |
| else |
| journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR; |
| write_unlock(&journal->j_state_lock); |
| } |
| |
| static journal_t *ext4_get_journal(struct super_block *sb, |
| unsigned int journal_inum) |
| { |
| struct inode *journal_inode; |
| journal_t *journal; |
| |
| BUG_ON(!ext4_has_feature_journal(sb)); |
| |
| /* First, test for the existence of a valid inode on disk. Bad |
| * things happen if we iget() an unused inode, as the subsequent |
| * iput() will try to delete it. */ |
| |
| journal_inode = ext4_iget(sb, journal_inum); |
| if (IS_ERR(journal_inode)) { |
| ext4_msg(sb, KERN_ERR, "no journal found"); |
| return NULL; |
| } |
| if (!journal_inode->i_nlink) { |
| make_bad_inode(journal_inode); |
| iput(journal_inode); |
| ext4_msg(sb, KERN_ERR, "journal inode is deleted"); |
| return NULL; |
| } |
| |
| jbd_debug(2, "Journal inode found at %p: %lld bytes\n", |
| journal_inode, journal_inode->i_size); |
| if (!S_ISREG(journal_inode->i_mode)) { |
| ext4_msg(sb, KERN_ERR, "invalid journal inode"); |
| iput(journal_inode); |
| return NULL; |
| } |
| |
| journal = jbd2_journal_init_inode(journal_inode); |
| if (!journal) { |
| ext4_msg(sb, KERN_ERR, "Could not load journal inode"); |
| iput(journal_inode); |
| return NULL; |
| } |
| journal->j_private = sb; |
| ext4_init_journal_params(sb, journal); |
| return journal; |
| } |
| |
| static journal_t *ext4_get_dev_journal(struct super_block *sb, |
| dev_t j_dev) |
| { |
| struct buffer_head *bh; |
| journal_t *journal; |
| ext4_fsblk_t start; |
| ext4_fsblk_t len; |
| int hblock, blocksize; |
| ext4_fsblk_t sb_block; |
| unsigned long offset; |
| struct ext4_super_block *es; |
| struct block_device *bdev; |
| |
| BUG_ON(!ext4_has_feature_journal(sb)); |
| |
| bdev = ext4_blkdev_get(j_dev, sb); |
| if (bdev == NULL) |
| return NULL; |
| |
| blocksize = sb->s_blocksize; |
| hblock = bdev_logical_block_size(bdev); |
| if (blocksize < hblock) { |
| ext4_msg(sb, KERN_ERR, |
| "blocksize too small for journal device"); |
| goto out_bdev; |
| } |
| |
| sb_block = EXT4_MIN_BLOCK_SIZE / blocksize; |
| offset = EXT4_MIN_BLOCK_SIZE % blocksize; |
| set_blocksize(bdev, blocksize); |
| if (!(bh = __bread(bdev, sb_block, blocksize))) { |
| ext4_msg(sb, KERN_ERR, "couldn't read superblock of " |
| "external journal"); |
| goto out_bdev; |
| } |
| |
| es = (struct ext4_super_block *) (bh->b_data + offset); |
| if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) || |
| !(le32_to_cpu(es->s_feature_incompat) & |
| EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) { |
| ext4_msg(sb, KERN_ERR, "external journal has " |
| "bad superblock"); |
| brelse(bh); |
| goto out_bdev; |
| } |
| |
| if ((le32_to_cpu(es->s_feature_ro_compat) & |
| EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) && |
| es->s_checksum != ext4_superblock_csum(sb, es)) { |
| ext4_msg(sb, KERN_ERR, "external journal has " |
| "corrupt superblock"); |
| brelse(bh); |
| goto out_bdev; |
| } |
| |
| if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) { |
| ext4_msg(sb, KERN_ERR, "journal UUID does not match"); |
| brelse(bh); |
| goto out_bdev; |
| } |
| |
| len = ext4_blocks_count(es); |
| start = sb_block + 1; |
| brelse(bh); /* we're done with the superblock */ |
| |
| journal = jbd2_journal_init_dev(bdev, sb->s_bdev, |
| start, len, blocksize); |
| if (!journal) { |
| ext4_msg(sb, KERN_ERR, "failed to create device journal"); |
| goto out_bdev; |
| } |
| journal->j_private = sb; |
| ll_rw_block(READ | REQ_META | REQ_PRIO, 1, &journal->j_sb_buffer); |
| wait_on_buffer(journal->j_sb_buffer); |
| if (!buffer_uptodate(journal->j_sb_buffer)) { |
| ext4_msg(sb, KERN_ERR, "I/O error on journal device"); |
| goto out_journal; |
| } |
| if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) { |
| ext4_msg(sb, KERN_ERR, "External journal has more than one " |
| "user (unsupported) - %d", |
| be32_to_cpu(journal->j_superblock->s_nr_users)); |
| goto out_journal; |
| } |
| EXT4_SB(sb)->journal_bdev = bdev; |
| ext4_init_journal_params(sb, journal); |
| return journal; |
| |
| out_journal: |
| jbd2_journal_destroy(journal); |
| out_bdev: |
| ext4_blkdev_put(bdev); |
| return NULL; |
| } |
| |
| static int ext4_load_journal(struct super_block *sb, |
| struct ext4_super_block *es, |
| unsigned long journal_devnum) |
| { |
| journal_t *journal; |
| unsigned int journal_inum = le32_to_cpu(es->s_journal_inum); |
| dev_t journal_dev; |
| int err = 0; |
| int really_read_only; |
| |
| BUG_ON(!ext4_has_feature_journal(sb)); |
| |
| if (journal_devnum && |
| journal_devnum != le32_to_cpu(es->s_journal_dev)) { |
| ext4_msg(sb, KERN_INFO, "external journal device major/minor " |
| "numbers have changed"); |
| journal_dev = new_decode_dev(journal_devnum); |
| } else |
| journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev)); |
| |
| really_read_only = bdev_read_only(sb->s_bdev); |
| |
| /* |
| * Are we loading a blank journal or performing recovery after a |
| * crash? For recovery, we need to check in advance whether we |
| * can get read-write access to the device. |
| */ |
| if (ext4_has_feature_journal_needs_recovery(sb)) { |
| if (sb->s_flags & MS_RDONLY) { |
| ext4_msg(sb, KERN_INFO, "INFO: recovery " |
| "required on readonly filesystem"); |
| if (really_read_only) { |
| ext4_msg(sb, KERN_ERR, "write access " |
| "unavailable, cannot proceed"); |
| return -EROFS; |
| } |
| ext4_msg(sb, KERN_INFO, "write access will " |
| "be enabled during recovery"); |
| } |
| } |
| |
| if (journal_inum && journal_dev) { |
| ext4_msg(sb, KERN_ERR, "filesystem has both journal " |
| "and inode journals!"); |
| return -EINVAL; |
| } |
| |
| if (journal_inum) { |
| if (!(journal = ext4_get_journal(sb, journal_inum))) |
| return -EINVAL; |
| } else { |
| if (!(journal = ext4_get_dev_journal(sb, journal_dev))) |
| return -EINVAL; |
| } |
| |
| if (!(journal->j_flags & JBD2_BARRIER)) |
| ext4_msg(sb, KERN_INFO, "barriers disabled"); |
| |
| if (!ext4_has_feature_journal_needs_recovery(sb)) |
| err = jbd2_journal_wipe(journal, !really_read_only); |
| if (!err) { |
| char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL); |
| if (save) |
| memcpy(save, ((char *) es) + |
| EXT4_S_ERR_START, EXT4_S_ERR_LEN); |
| err = jbd2_journal_load(journal); |
| if (save) |
| memcpy(((char *) es) + EXT4_S_ERR_START, |
| save, EXT4_S_ERR_LEN); |
| kfree(save); |
| } |
| |
| if (err) { |
| ext4_msg(sb, KERN_ERR, "error loading journal"); |
| jbd2_journal_destroy(journal); |
| return err; |
| } |
| |
| EXT4_SB(sb)->s_journal = journal; |
| ext4_clear_journal_err(sb, es); |
| |
| if (!really_read_only && journal_devnum && |
| journal_devnum != le32_to_cpu(es->s_journal_dev)) { |
| es->s_journal_dev = cpu_to_le32(journal_devnum); |
| |
| /* Make sure we flush the recovery flag to disk. */ |
| ext4_commit_super(sb, 1); |
| } |
| |
| return 0; |
| } |
| |
| static int ext4_commit_super(struct super_block *sb, int sync) |
| { |
| struct ext4_super_block *es = EXT4_SB(sb)->s_es; |
| struct buffer_head *sbh = EXT4_SB(sb)->s_sbh; |
| int error = 0; |
| |
| if (!sbh || block_device_ejected(sb)) |
| return error; |
| if (buffer_write_io_error(sbh)) { |
| /* |
| * Oh, dear. A previous attempt to write the |
| * superblock failed. This could happen because the |
| * USB device was yanked out. Or it could happen to |
| * be a transient write error and maybe the block will |
| * be remapped. Nothing we can do but to retry the |
| * write and hope for the best. |
| */ |
| ext4_msg(sb, KERN_ERR, "previous I/O error to " |
| "superblock detected"); |
| clear_buffer_write_io_error(sbh); |
| set_buffer_uptodate(sbh); |
| } |
| /* |
| * If the file system is mounted read-only, don't update the |
| * superblock write time. This avoids updating the superblock |
| * write time when we are mounting the root file system |
| * read/only but we need to replay the journal; at that point, |
| * for people who are east of GMT and who make their clock |
| * tick in localtime for Windows bug-for-bug compatibility, |
| * the clock is set in the future, and this will cause e2fsck |
| * to complain and force a full file system check. |
| */ |
| if (!(sb->s_flags & MS_RDONLY)) |
| es->s_wtime = cpu_to_le32(get_seconds()); |
| if (sb->s_bdev->bd_part) |
| es->s_kbytes_written = |
| cpu_to_le64(EXT4_SB(sb)->s_kbytes_written + |
| ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) - |
| EXT4_SB(sb)->s_sectors_written_start) >> 1)); |
| else |
| es->s_kbytes_written = |
| cpu_to_le64(EXT4_SB(sb)->s_kbytes_written); |
| if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeclusters_counter)) |
| ext4_free_blocks_count_set(es, |
| EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive( |
| &EXT4_SB(sb)->s_freeclusters_counter))); |
| if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeinodes_counter)) |
| es->s_free_inodes_count = |
| cpu_to_le32(percpu_counter_sum_positive( |
| &EXT4_SB(sb)->s_freeinodes_counter)); |
| BUFFER_TRACE(sbh, "marking dirty"); |
| ext4_superblock_csum_set(sb); |
| mark_buffer_dirty(sbh); |
| if (sync) { |
| error = __sync_dirty_buffer(sbh, |
| test_opt(sb, BARRIER) ? WRITE_FUA : WRITE_SYNC); |
| if (error) |
| return error; |
| |
| error = buffer_write_io_error(sbh); |
| if (error) { |
| ext4_msg(sb, KERN_ERR, "I/O error while writing " |
| "superblock"); |
| clear_buffer_write_io_error(sbh); |
| set_buffer_uptodate(sbh); |
| } |
| } |
| return error; |
| } |
| |
| /* |
| * Have we just finished recovery? If so, and if we are mounting (or |
| * remounting) the filesystem readonly, then we will end up with a |
| * consistent fs on disk. Record that fact. |
| */ |
| static void ext4_mark_recovery_complete(struct super_block *sb, |
| struct ext4_super_block *es) |
| { |
| journal_t *journal = EXT4_SB(sb)->s_journal; |
| |
| if (!ext4_has_feature_journal(sb)) { |
| BUG_ON(journal != NULL); |
| return; |
| } |
| jbd2_journal_lock_updates(journal); |
| if (jbd2_journal_flush(journal) < 0) |
| goto out; |
| |
| if (ext4_has_feature_journal_needs_recovery(sb) && |
| sb->s_flags & MS_RDONLY) { |
| ext4_clear_feature_journal_needs_recovery(sb); |
| ext4_commit_super(sb, 1); |
| } |
| |
| out: |
| jbd2_journal_unlock_updates(journal); |
| } |
| |
| /* |
| * If we are mounting (or read-write remounting) a filesystem whose journal |
| * has recorded an error from a previous lifetime, move that error to the |
| * main filesystem now. |
| */ |
| static void ext4_clear_journal_err(struct super_block *sb, |
| struct ext4_super_block *es) |
| { |
| journal_t *journal; |
| int j_errno; |
| const char *errstr; |
| |
| BUG_ON(!ext4_has_feature_journal(sb)); |
| |
| journal = EXT4_SB(sb)->s_journal; |
| |
| /* |
| * Now check for any error status which may have been recorded in the |
| * journal by a prior ext4_error() or ext4_abort() |
| */ |
| |
| j_errno = jbd2_journal_errno(journal); |
| if (j_errno) { |
| char nbuf[16]; |
| |
| errstr = ext4_decode_error(sb, j_errno, nbuf); |
| ext4_warning(sb, "Filesystem error recorded " |
| "from previous mount: %s", errstr); |
| ext4_warning(sb, "Marking fs in need of filesystem check."); |
| |
| EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; |
| es->s_state |= cpu_to_le16(EXT4_ERROR_FS); |
| ext4_commit_super(sb, 1); |
| |
| jbd2_journal_clear_err(journal); |
| jbd2_journal_update_sb_errno(journal); |
| } |
| } |
| |
| /* |
| * Force the running and committing transactions to commit, |
| * and wait on the commit. |
| */ |
| int ext4_force_commit(struct super_block *sb) |
| { |
| journal_t *journal; |
| |
| if (sb->s_flags & MS_RDONLY) |
| return 0; |
| |
| journal = EXT4_SB(sb)->s_journal; |
| return ext4_journal_force_commit(journal); |
| } |
| |
| static int ext4_sync_fs(struct super_block *sb, int wait) |
| { |
| int ret = 0; |
| tid_t target; |
| bool needs_barrier = false; |
| struct ext4_sb_info *sbi = EXT4_SB(sb); |
| |
| trace_ext4_sync_fs(sb, wait); |
| flush_workqueue(sbi->rsv_conversion_wq); |
| /* |
| * Writeback quota in non-journalled quota case - journalled quota has |
| * no dirty dquots |
| */ |
| dquot_writeback_dquots(sb, -1); |
| /* |
| * Data writeback is possible w/o journal transaction, so barrier must |
| * being sent at the end of the function. But we can skip it if |
| * transaction_commit will do it for us. |
| */ |
| if (sbi->s_journal) { |
| target = jbd2_get_latest_transaction(sbi->s_journal); |
| if (wait && sbi->s_journal->j_flags & JBD2_BARRIER && |
| !jbd2_trans_will_send_data_barrier(sbi->s_journal, target)) |
| needs_barrier = true; |
| |
| if (jbd2_journal_start_commit(sbi->s_journal, &target)) { |
| if (wait) |
| ret = jbd2_log_wait_commit(sbi->s_journal, |
| target); |
| } |
| } else if (wait && test_opt(sb, BARRIER)) |
| needs_barrier = true; |
| if (needs_barrier) { |
| int err; |
| err = blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL); |
| if (!ret) |
| ret = err; |
| } |
| |
| return ret; |
| } |
| |
| /* |
| * LVM calls this function before a (read-only) snapshot is created. This |
| * gives us a chance to flush the journal completely and mark the fs clean. |
| * |
| * Note that only this function cannot bring a filesystem to be in a clean |
| * state independently. It relies on upper layer to stop all data & metadata |
| * modifications. |
| */ |
| static int ext4_freeze(struct super_block *sb) |
| { |
| int error = 0; |
| journal_t *journal; |
| |
| if (sb->s_flags & MS_RDONLY) |
| return 0; |
| |
| journal = EXT4_SB(sb)->s_journal; |
| |
| if (journal) { |
| /* Now we set up the journal barrier. */ |
| jbd2_journal_lock_updates(journal); |
| |
| /* |
| * Don't clear the needs_recovery flag if we failed to |
| * flush the journal. |
| */ |
| error = jbd2_journal_flush(journal); |
| if (error < 0) |
| goto out; |
| |
| /* Journal blocked and flushed, clear needs_recovery flag. */ |
| ext4_clear_feature_journal_needs_recovery(sb); |
| } |
| |
| error = ext4_commit_super(sb, 1); |
| out: |
| if (journal) |
| /* we rely on upper layer to stop further updates */ |
| jbd2_journal_unlock_updates(journal); |
| return error; |
| } |
| |
| /* |
| * Called by LVM after the snapshot is done. We need to reset the RECOVER |
| * flag here, even though the filesystem is not technically dirty yet. |
| */ |
| static int ext4_unfreeze(struct super_block *sb) |
| { |
| if (sb->s_flags & MS_RDONLY) |
| return 0; |
| |
| if (EXT4_SB(sb)->s_journal) { |
| /* Reset the needs_recovery flag before the fs is unlocked. */ |
| ext4_set_feature_journal_needs_recovery(sb); |
| } |
| |
| ext4_commit_super(sb, 1); |
| return 0; |
| } |
| |
| /* |
| * Structure to save mount options for ext4_remount's benefit |
| */ |
| struct ext4_mount_options { |
| unsigned long s_mount_opt; |
| unsigned long s_mount_opt2; |
| kuid_t s_resuid; |
| kgid_t s_resgid; |
| unsigned long s_commit_interval; |
| u32 s_min_batch_time, s_max_batch_time; |
| #ifdef CONFIG_QUOTA |
| int s_jquota_fmt; |
| char *s_qf_names[EXT4_MAXQUOTAS]; |
| #endif |
| }; |
| |
| static int ext4_remount(struct super_block *sb, int *flags, char *data) |
| { |
| struct ext4_super_block *es; |
| struct ext4_sb_info *sbi = EXT4_SB(sb); |
| unsigned long old_sb_flags; |
| struct ext4_mount_options old_opts; |
| int enable_quota = 0; |
| ext4_group_t g; |
| unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO; |
| int err = 0; |
| #ifdef CONFIG_QUOTA |
| int i, j; |
| #endif |
| char *orig_data = kstrdup(data, GFP_KERNEL); |
| |
| /* Store the original options */ |
| old_sb_flags = sb->s_flags; |
| old_opts.s_mount_opt = sbi->s_mount_opt; |
| old_opts.s_mount_opt2 = sbi->s_mount_opt2; |
| old_opts.s_resuid = sbi->s_resuid; |
| old_opts.s_resgid = sbi->s_resgid; |
| old_opts.s_commit_interval = sbi->s_commit_interval; |
| old_opts.s_min_batch_time = sbi->s_min_batch_time; |
| old_opts.s_max_batch_time = sbi->s_max_batch_time; |
| #ifdef CONFIG_QUOTA |
| old_opts.s_jquota_fmt = sbi->s_jquota_fmt; |
| for (i = 0; i < EXT4_MAXQUOTAS; i++) |
| if (sbi->s_qf_names[i]) { |
| old_opts.s_qf_names[i] = kstrdup(sbi->s_qf_names[i], |
| GFP_KERNEL); |
| if (!old_opts.s_qf_names[i]) { |
| for (j = 0; j < i; j++) |
| kfree(old_opts.s_qf_names[j]); |
| kfree(orig_data); |
| return -ENOMEM; |
| } |
| } else |
| old_opts.s_qf_names[i] = NULL; |
| #endif |
| if (sbi->s_journal && sbi->s_journal->j_task->io_context) |
| journal_ioprio = sbi->s_journal->j_task->io_context->ioprio; |
| |
| if (!parse_options(data, sb, NULL, &journal_ioprio, 1)) { |
| err = -EINVAL; |
| goto restore_opts; |
| } |
| |
| if ((old_opts.s_mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) ^ |
| test_opt(sb, JOURNAL_CHECKSUM)) { |
| ext4_msg(sb, KERN_ERR, "changing journal_checksum " |
| "during remount not supported; ignoring"); |
| sbi->s_mount_opt ^= EXT4_MOUNT_JOURNAL_CHECKSUM; |
| } |
| |
| if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) { |
| if (test_opt2(sb, EXPLICIT_DELALLOC)) { |
| ext4_msg(sb, KERN_ERR, "can't mount with " |
| "both data=journal and delalloc"); |
| err = -EINVAL; |
| goto restore_opts; |
| } |
| if (test_opt(sb, DIOREAD_NOLOCK)) { |
| ext4_msg(sb, KERN_ERR, "can't mount with " |
| "both data=journal and dioread_nolock"); |
| err = -EINVAL; |
| goto restore_opts; |
| } |
| if (test_opt(sb, DAX)) { |
| ext4_msg(sb, KERN_ERR, "can't mount with " |
| "both data=journal and dax"); |
| err = -EINVAL; |
| goto restore_opts; |
| } |
| } |
| |
| if ((sbi->s_mount_opt ^ old_opts.s_mount_opt) & EXT4_MOUNT_DAX) { |
| ext4_msg(sb, KERN_WARNING, "warning: refusing change of " |
| "dax flag with busy inodes while remounting"); |
| sbi->s_mount_opt ^= EXT4_MOUNT_DAX; |
| } |
| |
| if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) |
| ext4_abort(sb, "Abort forced by user"); |
| |
| sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | |
| (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0); |
| |
| es = sbi->s_es; |
| |
| if (sbi->s_journal) { |
| ext4_init_journal_params(sb, sbi->s_journal); |
| set_task_ioprio(sbi->s_journal->j_task, journal_ioprio); |
| } |
| |
| if (*flags & MS_LAZYTIME) |
| sb->s_flags |= MS_LAZYTIME; |
| |
| if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) { |
| if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) { |
| err = -EROFS; |
| goto restore_opts; |
| } |
| |
| if (*flags & MS_RDONLY) { |
| err = sync_filesystem(sb); |
| if (err < 0) |
| goto restore_opts; |
| err = dquot_suspend(sb, -1); |
| if (err < 0) |
| goto restore_opts; |
| |
| /* |
| * First of all, the unconditional stuff we have to do |
| * to disable replay of the journal when we next remount |
| */ |
| sb->s_flags |= MS_RDONLY; |
| |
| /* |
| * OK, test if we are remounting a valid rw partition |
| * readonly, and if so set the rdonly flag and then |
| * mark the partition as valid again. |
| */ |
| if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) && |
| (sbi->s_mount_state & EXT4_VALID_FS)) |
| es->s_state = cpu_to_le16(sbi->s_mount_state); |
| |
| if (sbi->s_journal) |
| ext4_mark_recovery_complete(sb, es); |
| } else { |
| /* Make sure we can mount this feature set readwrite */ |
| if (ext4_has_feature_readonly(sb) || |
| !ext4_feature_set_ok(sb, 0)) { |
| err = -EROFS; |
| goto restore_opts; |
| } |
| /* |
| * Make sure the group descriptor checksums |
| * are sane. If they aren't, refuse to remount r/w. |
| */ |
| for (g = 0; g < sbi->s_groups_count; g++) { |
| struct ext4_group_desc *gdp = |
| ext4_get_group_desc(sb, g, NULL); |
| |
| if (!ext4_group_desc_csum_verify(sb, g, gdp)) { |
| ext4_msg(sb, KERN_ERR, |
| "ext4_remount: Checksum for group %u failed (%u!=%u)", |
| g, le16_to_cpu(ext4_group_desc_csum(sb, g, gdp)), |
| le16_to_cpu(gdp->bg_checksum)); |
| err = -EFSBADCRC; |
| goto restore_opts; |
| } |
| } |
| |
| /* |
| * If we have an unprocessed orphan list hanging |
| * around from a previously readonly bdev mount, |
| * require a full umount/remount for now. |
| */ |
| if (es->s_last_orphan) { |
| ext4_msg(sb, KERN_WARNING, "Couldn't " |
| "remount RDWR because of unprocessed " |
| "orphan inode list. Please " |
| "umount/remount instead"); |
| err = -EINVAL; |
| goto restore_opts; |
| } |
| |
| /* |
| * Mounting a RDONLY partition read-write, so reread |
| * and store the current valid flag. (It may have |
| * been changed by e2fsck since we originally mounted |
| * the partition.) |
| */ |
| if (sbi->s_journal) |
| ext4_clear_journal_err(sb, es); |
| sbi->s_mount_state = le16_to_cpu(es->s_state); |
| if (!ext4_setup_super(sb, es, 0)) |
| sb->s_flags &= ~MS_RDONLY; |
| if (ext4_has_feature_mmp(sb)) |
| if (ext4_multi_mount_protect(sb, |
| le64_to_cpu(es->s_mmp_block))) { |
| err = -EROFS; |
| goto restore_opts; |
| } |
| enable_quota = 1; |
| } |
| } |
| |
| /* |
| * Reinitialize lazy itable initialization thread based on |
| * current settings |
| */ |
| if ((sb->s_flags & MS_RDONLY) || !test_opt(sb, INIT_INODE_TABLE)) |
| ext4_unregister_li_request(sb); |
| else { |
| ext4_group_t first_not_zeroed; |
| first_not_zeroed = ext4_has_uninit_itable(sb); |
| ext4_register_li_request(sb, first_not_zeroed); |
| } |
| |
| ext4_setup_system_zone(sb); |
| if (sbi->s_journal == NULL && !(old_sb_flags & MS_RDONLY)) |
| ext4_commit_super(sb, 1); |
| |
| #ifdef CONFIG_QUOTA |
| /* Release old quota file names */ |
| for (i = 0; i < EXT4_MAXQUOTAS; i++) |
| kfree(old_opts.s_qf_names[i]); |
| if (enable_quota) { |
| if (sb_any_quota_suspended(sb)) |
| dquot_resume(sb, -1); |
| else if (ext4_has_feature_quota(sb)) { |
| err = ext4_enable_quotas(sb); |
| if (err) |
| goto restore_opts; |
| } |
| } |
| #endif |
| |
| *flags = (*flags & ~MS_LAZYTIME) | (sb->s_flags & MS_LAZYTIME); |
| ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data); |
| kfree(orig_data); |
| return 0; |
| |
| restore_opts: |
| sb->s_flags = old_sb_flags; |
| sbi->s_mount_opt = old_opts.s_mount_opt; |
| sbi->s_mount_opt2 = old_opts.s_mount_opt2; |
| sbi->s_resuid = old_opts.s_resuid; |
| sbi->s_resgid = old_opts.s_resgid; |
| sbi->s_commit_interval = old_opts.s_commit_interval; |
| sbi->s_min_batch_time = old_opts.s_min_batch_time; |
| sbi->s_max_batch_time = old_opts.s_max_batch_time; |
| #ifdef CONFIG_QUOTA |
| sbi->s_jquota_fmt = old_opts.s_jquota_fmt; |
| for (i = 0; i < EXT4_MAXQUOTAS; i++) { |
| kfree(sbi->s_qf_names[i]); |
| sbi->s_qf_names[i] = old_opts.s_qf_names[i]; |
| } |
| #endif |
| kfree(orig_data); |
| return err; |
| } |
| |
| #ifdef CONFIG_QUOTA |
| static int ext4_statfs_project(struct super_block *sb, |
| kprojid_t projid, struct kstatfs *buf) |
| { |
| struct kqid qid; |
| struct dquot *dquot; |
| u64 limit; |
| u64 curblock; |
| |
| qid = make_kqid_projid(projid); |
| dquot = dqget(sb, qid); |
| if (IS_ERR(dquot)) |
| return PTR_ERR(dquot); |
| spin_lock(&dq_data_lock); |
| |
| limit = (dquot->dq_dqb.dqb_bsoftlimit ? |
| dquot->dq_dqb.dqb_bsoftlimit : |
| dquot->dq_dqb.dqb_bhardlimit) >> sb->s_blocksize_bits; |
| if (limit && buf->f_blocks > limit) { |
| curblock = dquot->dq_dqb.dqb_curspace >> sb->s_blocksize_bits; |
| buf->f_blocks = limit; |
| buf->f_bfree = buf->f_bavail = |
| (buf->f_blocks > curblock) ? |
| (buf->f_blocks - curblock) : 0; |
| } |
| |
| limit = dquot->dq_dqb.dqb_isoftlimit ? |
| dquot->dq_dqb.dqb_isoftlimit : |
| dquot->dq_dqb.dqb_ihardlimit; |
| if (limit && buf->f_files > limit) { |
| buf->f_files = limit; |
| buf->f_ffree = |
| (buf->f_files > dquot->dq_dqb.dqb_curinodes) ? |
| (buf->f_files - dquot->dq_dqb.dqb_curinodes) : 0; |
| } |
| |
| spin_unlock(&dq_data_lock); |
| dqput(dquot); |
| return 0; |
| } |
| #endif |
| |
| static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf) |
| { |
| struct super_block *sb = dentry->d_sb; |
| struct ext4_sb_info *sbi = EXT4_SB(sb); |
| struct ext4_super_block *es = sbi->s_es; |
| ext4_fsblk_t overhead = 0, resv_blocks; |
| u64 fsid; |
| s64 bfree; |
| resv_blocks = EXT4_C2B(sbi, atomic64_read(&sbi->s_resv_clusters)); |
| |
| if (!test_opt(sb, MINIX_DF)) |
| overhead = sbi->s_overhead; |
| |
| buf->f_type = EXT4_SUPER_MAGIC; |
| buf->f_bsize = sb->s_blocksize; |
| buf->f_blocks = ext4_blocks_count(es) - EXT4_C2B(sbi, overhead); |
| bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) - |
| percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter); |
| /* prevent underflow in case that few free space is available */ |
| buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0)); |
| buf->f_bavail = buf->f_bfree - |
| (ext4_r_blocks_count(es) + resv_blocks); |
| if (buf->f_bfree < (ext4_r_blocks_count(es) + resv_blocks)) |
| buf->f_bavail = 0; |
| buf->f_files = le32_to_cpu(es->s_inodes_count); |
| buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter); |
| buf->f_namelen = EXT4_NAME_LEN; |
| fsid = le64_to_cpup((void *)es->s_uuid) ^ |
| le64_to_cpup((void *)es->s_uuid + sizeof(u64)); |
| buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL; |
| buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL; |
| |
| #ifdef CONFIG_QUOTA |
| if (ext4_test_inode_flag(dentry->d_inode, EXT4_INODE_PROJINHERIT) && |
| sb_has_quota_limits_enabled(sb, PRJQUOTA)) |
| ext4_statfs_project(sb, EXT4_I(dentry->d_inode)->i_projid, buf); |
| #endif |
| return 0; |
| } |
| |
| /* Helper function for writing quotas on sync - we need to start transaction |
| * before quota file is locked for write. Otherwise the are possible deadlocks: |
| * Process 1 Process 2 |
| * ext4_create() quota_sync() |
| * jbd2_journal_start() write_dquot() |
| * dquot_initialize() down(dqio_mutex) |
| * down(dqio_mutex) jbd2_journal_start() |
| * |
| */ |
| |
| #ifdef CONFIG_QUOTA |
| |
| static inline struct inode *dquot_to_inode(struct dquot *dquot) |
| { |
| return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type]; |
| } |
| |
| static int ext4_write_dquot(struct dquot *dquot) |
| { |
| int ret, err; |
| handle_t *handle; |
| struct inode *inode; |
| |
| inode = dquot_to_inode(dquot); |
| handle = ext4_journal_start(inode, EXT4_HT_QUOTA, |
| EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb)); |
| if (IS_ERR(handle)) |
| return PTR_ERR(handle); |
| ret = dquot_commit(dquot); |
| err = ext4_journal_stop(handle); |
| if (!ret) |
| ret = err; |
| return ret; |
| } |
| |
| static int ext4_acquire_dquot(struct dquot *dquot) |
| { |
| int ret, err; |
| handle_t *handle; |
| |
| handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA, |
| EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb)); |
| if (IS_ERR(handle)) |
| return PTR_ERR(handle); |
| ret = dquot_acquire(dquot); |
| err = ext4_journal_stop(handle); |
| if (!ret) |
| ret = err; |
| return ret; |
| } |
| |
| static int ext4_release_dquot(struct dquot *dquot) |
| { |
| int ret, err; |
| handle_t *handle; |
| |
| handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA, |
| EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb)); |
| if (IS_ERR(handle)) { |
| /* Release dquot anyway to avoid endless cycle in dqput() */ |
| dquot_release(dquot); |
| return PTR_ERR(handle); |
| } |
| ret = dquot_release(dquot); |
| err = ext4_journal_stop(handle); |
| if (!ret) |
| ret = err; |
| return ret; |
| } |
| |
| static int ext4_mark_dquot_dirty(struct dquot *dquot) |
| { |
| struct super_block *sb = dquot->dq_sb; |
| struct ext4_sb_info *sbi = EXT4_SB(sb); |
| |
| /* Are we journaling quotas? */ |
| if (ext4_has_feature_quota(sb) || |
| sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) { |
| dquot_mark_dquot_dirty(dquot); |
| return ext4_write_dquot(dquot); |
| } else { |
| return dquot_mark_dquot_dirty(dquot); |
| } |
| } |
| |
| static int ext4_write_info(struct super_block *sb, int type) |
| { |
| int ret, err; |
| handle_t *handle; |
| |
| /* Data block + inode block */ |
| handle = ext4_journal_start(d_inode(sb->s_root), EXT4_HT_QUOTA, 2); |
| if (IS_ERR(handle)) |
| return PTR_ERR(handle); |
| ret = dquot_commit_info(sb, type); |
| err = ext4_journal_stop(handle); |
| if (!ret) |
| ret = err; |
| return ret; |
| } |
| |
| /* |
| * Turn on quotas during mount time - we need to find |
| * the quota file and such... |
| */ |
| static int ext4_quota_on_mount(struct super_block *sb, int type) |
| { |
| return dquot_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type], |
| EXT4_SB(sb)->s_jquota_fmt, type); |
| } |
| |
| /* |
| * Standard function to be called on quota_on |
| */ |
| static int ext4_quota_on(struct super_block *sb, int type, int format_id, |
| struct path *path) |
| { |
| int err; |
| |
| if (!test_opt(sb, QUOTA)) |
| return -EINVAL; |
| |
| /* Quotafile not on the same filesystem? */ |
| if (path->dentry->d_sb != sb) |
| return -EXDEV; |
| /* Journaling quota? */ |
| if (EXT4_SB(sb)->s_qf_names[type]) { |
| /* Quotafile not in fs root? */ |
| if (path->dentry->d_parent != sb->s_root) |
| ext4_msg(sb, KERN_WARNING, |
| "Quota file not on filesystem root. " |
| "Journaled quota will not work"); |
| } |
| |
| /* |
| * When we journal data on quota file, we have to flush journal to see |
| * all updates to the file when we bypass pagecache... |
| */ |
| if (EXT4_SB(sb)->s_journal && |
| ext4_should_journal_data(d_inode(path->dentry))) { |
| /* |
| * We don't need to lock updates but journal_flush() could |
| * otherwise be livelocked... |
| */ |
| jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal); |
| err = jbd2_journal_flush(EXT4_SB(sb)->s_journal); |
| jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); |
| if (err) |
| return err; |
| } |
| |
| return dquot_quota_on(sb, type, format_id, path); |
| } |
| |
| static int ext4_quota_enable(struct super_block *sb, int type, int format_id, |
| unsigned int flags) |
| { |
| int err; |
| struct inode *qf_inode; |
| unsigned long qf_inums[EXT4_MAXQUOTAS] = { |
| le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum), |
| le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum), |
| le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum) |
| }; |
| |
| BUG_ON(!ext4_has_feature_quota(sb)); |
| |
| if (!qf_inums[type]) |
| return -EPERM; |
| |
| qf_inode = ext4_iget(sb, qf_inums[type]); |
| if (IS_ERR(qf_inode)) { |
| ext4_error(sb, "Bad quota inode # %lu", qf_inums[type]); |
| return PTR_ERR(qf_inode); |
| } |
| |
| /* Don't account quota for quota files to avoid recursion */ |
| qf_inode->i_flags |= S_NOQUOTA; |
| err = dquot_enable(qf_inode, type, format_id, flags); |
| iput(qf_inode); |
| |
| return err; |
| } |
| |
| /* Enable usage tracking for all quota types. */ |
| static int ext4_enable_quotas(struct super_block *sb) |
| { |
| int type, err = 0; |
| unsigned long qf_inums[EXT4_MAXQUOTAS] = { |
| le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum), |
| le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum), |
| le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum) |
| }; |
| |
| sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE; |
| for (type = 0; type < EXT4_MAXQUOTAS; type++) { |
| if (qf_inums[type]) { |
| err = ext4_quota_enable(sb, type, QFMT_VFS_V1, |
| DQUOT_USAGE_ENABLED); |
| if (err) { |
| ext4_warning(sb, |
| "Failed to enable quota tracking " |
| "(type=%d, err=%d). Please run " |
| "e2fsck to fix.", type, err); |
| return err; |
| } |
| } |
| } |
| return 0; |
| } |
| |
| static int ext4_quota_off(struct super_block *sb, int type) |
| { |
| struct inode *inode = sb_dqopt(sb)->files[type]; |
| handle_t *handle; |
| |
| /* Force all delayed allocation blocks to be allocated. |
| * Caller already holds s_umount sem */ |
| if (test_opt(sb, DELALLOC)) |
| sync_filesystem(sb); |
| |
| if (!inode) |
| goto out; |
| |
| /* Update modification times of quota files when userspace can |
| * start looking at them */ |
| handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1); |
| if (IS_ERR(handle)) |
| goto out; |
| inode->i_mtime = inode->i_ctime = CURRENT_TIME; |
| ext4_mark_inode_dirty(handle, inode); |
| ext4_journal_stop(handle); |
| |
| out: |
| return dquot_quota_off(sb, type); |
| } |
| |
| /* Read data from quotafile - avoid pagecache and such because we cannot afford |
| * acquiring the locks... As quota files are never truncated and quota code |
| * itself serializes the operations (and no one else should touch the files) |
| * we don't have to be afraid of races */ |
| static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data, |
| size_t len, loff_t off) |
| { |
| struct inode *inode = sb_dqopt(sb)->files[type]; |
| ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb); |
| int offset = off & (sb->s_blocksize - 1); |
| int tocopy; |
| size_t toread; |
| struct buffer_head *bh; |
| loff_t i_size = i_size_read(inode); |
| |
| if (off > i_size) |
| return 0; |
| if (off+len > i_size) |
| len = i_size-off; |
| toread = len; |
| while (toread > 0) { |
| tocopy = sb->s_blocksize - offset < toread ? |
| sb->s_blocksize - offset : toread; |
| bh = ext4_bread(NULL, inode, blk, 0); |
| if (IS_ERR(bh)) |
| return PTR_ERR(bh); |
| if (!bh) /* A hole? */ |
| memset(data, 0, tocopy); |
| else |
| memcpy(data, bh->b_data+offset, tocopy); |
| brelse(bh); |
| offset = 0; |
| toread -= tocopy; |
| data += tocopy; |
| blk++; |
| } |
| return len; |
| } |
| |
| /* Write to quotafile (we know the transaction is already started and has |
| * enough credits) */ |
| static ssize_t ext4_quota_write(struct super_block *sb, int type, |
| const char *data, size_t len, loff_t off) |
| { |
| struct inode *inode = sb_dqopt(sb)->files[type]; |
| ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb); |
| int err, offset = off & (sb->s_blocksize - 1); |
| int retries = 0; |
| struct buffer_head *bh; |
| handle_t *handle = journal_current_handle(); |
| |
| if (EXT4_SB(sb)->s_journal && !handle) { |
| ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)" |
| " cancelled because transaction is not started", |
| (unsigned long long)off, (unsigned long long)len); |
| return -EIO; |
| } |
| /* |
| * Since we account only one data block in transaction credits, |
| * then it is impossible to cross a block boundary. |
| */ |
| if (sb->s_blocksize - offset < len) { |
| ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)" |
| " cancelled because not block aligned", |
| (unsigned long long)off, (unsigned long long)len); |
| return -EIO; |
| } |
| |
| do { |
| bh = ext4_bread(handle, inode, blk, |
| EXT4_GET_BLOCKS_CREATE | |
| EXT4_GET_BLOCKS_METADATA_NOFAIL); |
| } while (IS_ERR(bh) && (PTR_ERR(bh) == -ENOSPC) && |
| ext4_should_retry_alloc(inode->i_sb, &retries)); |
| if (IS_ERR(bh)) |
| return PTR_ERR(bh); |
| if (!bh) |
| goto out; |
| BUFFER_TRACE(bh, "get write access"); |
| err = ext4_journal_get_write_access(handle, bh); |
| if (err) { |
| brelse(bh); |
| return err; |
| } |
| lock_buffer(bh); |
| memcpy(bh->b_data+offset, data, len); |
| flush_dcache_page(bh->b_page); |
| unlock_buffer(bh); |
| err = ext4_handle_dirty_metadata(handle, NULL, bh); |
| brelse(bh); |
| out: |
| if (inode->i_size < off + len) { |
| i_size_write(inode, off + len); |
| EXT4_I(inode)->i_disksize = inode->i_size; |
| ext4_mark_inode_dirty(handle, inode); |
| } |
| return len; |
| } |
| |
| #endif |
| |
| static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags, |
| const char *dev_name, void *data) |
| { |
| return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super); |
| } |
| |
| #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2) |
| static inline void register_as_ext2(void) |
| { |
| int err = register_filesystem(&ext2_fs_type); |
| if (err) |
| printk(KERN_WARNING |
| "EXT4-fs: Unable to register as ext2 (%d)\n", err); |
| } |
| |
| static inline void unregister_as_ext2(void) |
| { |
| unregister_filesystem(&ext2_fs_type); |
| } |
| |
| static inline int ext2_feature_set_ok(struct super_block *sb) |
| { |
| if (ext4_has_unknown_ext2_incompat_features(sb)) |
| return 0; |
| if (sb->s_flags & MS_RDONLY) |
| return 1; |
| if (ext4_has_unknown_ext2_ro_compat_features(sb)) |
| return 0; |
| return 1; |
| } |
| #else |
| static inline void register_as_ext2(void) { } |
| static inline void unregister_as_ext2(void) { } |
| static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; } |
| #endif |
| |
| static inline void register_as_ext3(void) |
| { |
| int err = register_filesystem(&ext3_fs_type); |
| if (err) |
| printk(KERN_WARNING |
| "EXT4-fs: Unable to register as ext3 (%d)\n", err); |
| } |
| |
| static inline void unregister_as_ext3(void) |
| { |
| unregister_filesystem(&ext3_fs_type); |
| } |
| |
| static inline int ext3_feature_set_ok(struct super_block *sb) |
| { |
| if (ext4_has_unknown_ext3_incompat_features(sb)) |
| return 0; |
| if (!ext4_has_feature_journal(sb)) |
| return 0; |
| if (sb->s_flags & MS_RDONLY) |
| return 1; |
| if (ext4_has_unknown_ext3_ro_compat_features(sb)) |
| return 0; |
| return 1; |
| } |
| |
| static struct file_system_type ext4_fs_type = { |
| .owner = THIS_MODULE, |
| .name = "ext4", |
| .mount = ext4_mount, |
| .kill_sb = kill_block_super, |
| .fs_flags = FS_REQUIRES_DEV, |
| }; |
| MODULE_ALIAS_FS("ext4"); |
| |
| /* Shared across all ext4 file systems */ |
| wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ]; |
| |
| static int __init ext4_init_fs(void) |
| { |
| int i, err; |
| |
| ratelimit_state_init(&ext4_mount_msg_ratelimit, 30 * HZ, 64); |
| ext4_li_info = NULL; |
| mutex_init(&ext4_li_mtx); |
| |
| /* Build-time check for flags consistency */ |
| ext4_check_flag_values(); |
| |
| for (i = 0; i < EXT4_WQ_HASH_SZ; i++) |
| init_waitqueue_head(&ext4__ioend_wq[i]); |
| |
| err = ext4_init_es(); |
| if (err) |
| return err; |
| |
| err = ext4_init_pageio(); |
| if (err) |
| goto out5; |
| |
| err = ext4_init_system_zone(); |
| if (err) |
| goto out4; |
| |
| err = ext4_init_sysfs(); |
| if (err) |
| goto out3; |
| |
| err = ext4_init_mballoc(); |
| if (err) |
| goto out2; |
| err = init_inodecache(); |
| if (err) |
| goto out1; |
| register_as_ext3(); |
| register_as_ext2(); |
| err = register_filesystem(&ext4_fs_type); |
| if (err) |
| goto out; |
| |
| return 0; |
| out: |
| unregister_as_ext2(); |
| unregister_as_ext3(); |
| destroy_inodecache(); |
| out1: |
| ext4_exit_mballoc(); |
| out2: |
| ext4_exit_sysfs(); |
| out3: |
| ext4_exit_system_zone(); |
| out4: |
| ext4_exit_pageio(); |
| out5: |
| ext4_exit_es(); |
| |
| return err; |
| } |
| |
| static void __exit ext4_exit_fs(void) |
| { |
| ext4_exit_crypto(); |
| ext4_destroy_lazyinit_thread(); |
| unregister_as_ext2(); |
| unregister_as_ext3(); |
| unregister_filesystem(&ext4_fs_type); |
| destroy_inodecache(); |
| ext4_exit_mballoc(); |
| ext4_exit_sysfs(); |
| ext4_exit_system_zone(); |
| ext4_exit_pageio(); |
| ext4_exit_es(); |
| } |
| |
| MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others"); |
| MODULE_DESCRIPTION("Fourth Extended Filesystem"); |
| MODULE_LICENSE("GPL"); |
| module_init(ext4_init_fs) |
| module_exit(ext4_exit_fs) |