| /* |
| * fs/f2fs/super.c |
| * |
| * Copyright (c) 2012 Samsung Electronics Co., Ltd. |
| * http://www.samsung.com/ |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| */ |
| #include <linux/module.h> |
| #include <linux/init.h> |
| #include <linux/fs.h> |
| #include <linux/statfs.h> |
| #include <linux/buffer_head.h> |
| #include <linux/backing-dev.h> |
| #include <linux/kthread.h> |
| #include <linux/parser.h> |
| #include <linux/mount.h> |
| #include <linux/seq_file.h> |
| #include <linux/proc_fs.h> |
| #include <linux/random.h> |
| #include <linux/exportfs.h> |
| #include <linux/blkdev.h> |
| #include <linux/f2fs_fs.h> |
| #include <linux/kobject.h> |
| #include <linux/sysfs.h> |
| |
| #include "f2fs.h" |
| #include "node.h" |
| #include "segment.h" |
| #include "xattr.h" |
| #include "gc.h" |
| |
| #define CREATE_TRACE_POINTS |
| #include <trace/events/f2fs.h> |
| |
| static struct proc_dir_entry *f2fs_proc_root; |
| static struct kmem_cache *f2fs_inode_cachep; |
| static struct kset *f2fs_kset; |
| |
| enum { |
| Opt_gc_background, |
| Opt_disable_roll_forward, |
| Opt_discard, |
| Opt_noheap, |
| Opt_nouser_xattr, |
| Opt_noacl, |
| Opt_active_logs, |
| Opt_disable_ext_identify, |
| Opt_err, |
| }; |
| |
| static match_table_t f2fs_tokens = { |
| {Opt_gc_background, "background_gc=%s"}, |
| {Opt_disable_roll_forward, "disable_roll_forward"}, |
| {Opt_discard, "discard"}, |
| {Opt_noheap, "no_heap"}, |
| {Opt_nouser_xattr, "nouser_xattr"}, |
| {Opt_noacl, "noacl"}, |
| {Opt_active_logs, "active_logs=%u"}, |
| {Opt_disable_ext_identify, "disable_ext_identify"}, |
| {Opt_err, NULL}, |
| }; |
| |
| /* Sysfs support for f2fs */ |
| struct f2fs_attr { |
| struct attribute attr; |
| ssize_t (*show)(struct f2fs_attr *, struct f2fs_sb_info *, char *); |
| ssize_t (*store)(struct f2fs_attr *, struct f2fs_sb_info *, |
| const char *, size_t); |
| int offset; |
| }; |
| |
| static ssize_t f2fs_sbi_show(struct f2fs_attr *a, |
| struct f2fs_sb_info *sbi, char *buf) |
| { |
| struct f2fs_gc_kthread *gc_kth = sbi->gc_thread; |
| unsigned int *ui; |
| |
| if (!gc_kth) |
| return -EINVAL; |
| |
| ui = (unsigned int *)(((char *)gc_kth) + a->offset); |
| |
| return snprintf(buf, PAGE_SIZE, "%u\n", *ui); |
| } |
| |
| static ssize_t f2fs_sbi_store(struct f2fs_attr *a, |
| struct f2fs_sb_info *sbi, |
| const char *buf, size_t count) |
| { |
| struct f2fs_gc_kthread *gc_kth = sbi->gc_thread; |
| unsigned long t; |
| unsigned int *ui; |
| ssize_t ret; |
| |
| if (!gc_kth) |
| return -EINVAL; |
| |
| ui = (unsigned int *)(((char *)gc_kth) + a->offset); |
| |
| ret = kstrtoul(skip_spaces(buf), 0, &t); |
| if (ret < 0) |
| return ret; |
| *ui = t; |
| return count; |
| } |
| |
| static ssize_t f2fs_attr_show(struct kobject *kobj, |
| struct attribute *attr, char *buf) |
| { |
| struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info, |
| s_kobj); |
| struct f2fs_attr *a = container_of(attr, struct f2fs_attr, attr); |
| |
| return a->show ? a->show(a, sbi, buf) : 0; |
| } |
| |
| static ssize_t f2fs_attr_store(struct kobject *kobj, struct attribute *attr, |
| const char *buf, size_t len) |
| { |
| struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info, |
| s_kobj); |
| struct f2fs_attr *a = container_of(attr, struct f2fs_attr, attr); |
| |
| return a->store ? a->store(a, sbi, buf, len) : 0; |
| } |
| |
| static void f2fs_sb_release(struct kobject *kobj) |
| { |
| struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info, |
| s_kobj); |
| complete(&sbi->s_kobj_unregister); |
| } |
| |
| #define F2FS_ATTR_OFFSET(_name, _mode, _show, _store, _elname) \ |
| static struct f2fs_attr f2fs_attr_##_name = { \ |
| .attr = {.name = __stringify(_name), .mode = _mode }, \ |
| .show = _show, \ |
| .store = _store, \ |
| .offset = offsetof(struct f2fs_gc_kthread, _elname), \ |
| } |
| |
| #define F2FS_RW_ATTR(name, elname) \ |
| F2FS_ATTR_OFFSET(name, 0644, f2fs_sbi_show, f2fs_sbi_store, elname) |
| |
| F2FS_RW_ATTR(gc_min_sleep_time, min_sleep_time); |
| F2FS_RW_ATTR(gc_max_sleep_time, max_sleep_time); |
| F2FS_RW_ATTR(gc_no_gc_sleep_time, no_gc_sleep_time); |
| F2FS_RW_ATTR(gc_idle, gc_idle); |
| |
| #define ATTR_LIST(name) (&f2fs_attr_##name.attr) |
| static struct attribute *f2fs_attrs[] = { |
| ATTR_LIST(gc_min_sleep_time), |
| ATTR_LIST(gc_max_sleep_time), |
| ATTR_LIST(gc_no_gc_sleep_time), |
| ATTR_LIST(gc_idle), |
| NULL, |
| }; |
| |
| static const struct sysfs_ops f2fs_attr_ops = { |
| .show = f2fs_attr_show, |
| .store = f2fs_attr_store, |
| }; |
| |
| static struct kobj_type f2fs_ktype = { |
| .default_attrs = f2fs_attrs, |
| .sysfs_ops = &f2fs_attr_ops, |
| .release = f2fs_sb_release, |
| }; |
| |
| void f2fs_msg(struct super_block *sb, const char *level, const char *fmt, ...) |
| { |
| struct va_format vaf; |
| va_list args; |
| |
| va_start(args, fmt); |
| vaf.fmt = fmt; |
| vaf.va = &args; |
| printk("%sF2FS-fs (%s): %pV\n", level, sb->s_id, &vaf); |
| va_end(args); |
| } |
| |
| static void init_once(void *foo) |
| { |
| struct f2fs_inode_info *fi = (struct f2fs_inode_info *) foo; |
| |
| inode_init_once(&fi->vfs_inode); |
| } |
| |
| static int parse_options(struct super_block *sb, char *options) |
| { |
| struct f2fs_sb_info *sbi = F2FS_SB(sb); |
| substring_t args[MAX_OPT_ARGS]; |
| char *p, *name; |
| int arg = 0; |
| |
| if (!options) |
| return 0; |
| |
| while ((p = strsep(&options, ",")) != NULL) { |
| int token; |
| 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, f2fs_tokens, args); |
| |
| switch (token) { |
| case Opt_gc_background: |
| name = match_strdup(&args[0]); |
| |
| if (!name) |
| return -ENOMEM; |
| if (!strncmp(name, "on", 2)) |
| set_opt(sbi, BG_GC); |
| else if (!strncmp(name, "off", 3)) |
| clear_opt(sbi, BG_GC); |
| else { |
| kfree(name); |
| return -EINVAL; |
| } |
| kfree(name); |
| break; |
| case Opt_disable_roll_forward: |
| set_opt(sbi, DISABLE_ROLL_FORWARD); |
| break; |
| case Opt_discard: |
| set_opt(sbi, DISCARD); |
| break; |
| case Opt_noheap: |
| set_opt(sbi, NOHEAP); |
| break; |
| #ifdef CONFIG_F2FS_FS_XATTR |
| case Opt_nouser_xattr: |
| clear_opt(sbi, XATTR_USER); |
| break; |
| #else |
| case Opt_nouser_xattr: |
| f2fs_msg(sb, KERN_INFO, |
| "nouser_xattr options not supported"); |
| break; |
| #endif |
| #ifdef CONFIG_F2FS_FS_POSIX_ACL |
| case Opt_noacl: |
| clear_opt(sbi, POSIX_ACL); |
| break; |
| #else |
| case Opt_noacl: |
| f2fs_msg(sb, KERN_INFO, "noacl options not supported"); |
| break; |
| #endif |
| case Opt_active_logs: |
| if (args->from && match_int(args, &arg)) |
| return -EINVAL; |
| if (arg != 2 && arg != 4 && arg != NR_CURSEG_TYPE) |
| return -EINVAL; |
| sbi->active_logs = arg; |
| break; |
| case Opt_disable_ext_identify: |
| set_opt(sbi, DISABLE_EXT_IDENTIFY); |
| break; |
| default: |
| f2fs_msg(sb, KERN_ERR, |
| "Unrecognized mount option \"%s\" or missing value", |
| p); |
| return -EINVAL; |
| } |
| } |
| return 0; |
| } |
| |
| static struct inode *f2fs_alloc_inode(struct super_block *sb) |
| { |
| struct f2fs_inode_info *fi; |
| |
| fi = kmem_cache_alloc(f2fs_inode_cachep, GFP_NOFS | __GFP_ZERO); |
| if (!fi) |
| return NULL; |
| |
| init_once((void *) fi); |
| |
| /* Initialize f2fs-specific inode info */ |
| fi->vfs_inode.i_version = 1; |
| atomic_set(&fi->dirty_dents, 0); |
| fi->i_current_depth = 1; |
| fi->i_advise = 0; |
| rwlock_init(&fi->ext.ext_lock); |
| |
| set_inode_flag(fi, FI_NEW_INODE); |
| |
| return &fi->vfs_inode; |
| } |
| |
| static int f2fs_drop_inode(struct inode *inode) |
| { |
| /* |
| * This is to avoid a deadlock condition like below. |
| * writeback_single_inode(inode) |
| * - f2fs_write_data_page |
| * - f2fs_gc -> iput -> evict |
| * - inode_wait_for_writeback(inode) |
| */ |
| if (!inode_unhashed(inode) && inode->i_state & I_SYNC) |
| return 0; |
| return generic_drop_inode(inode); |
| } |
| |
| /* |
| * f2fs_dirty_inode() is called from __mark_inode_dirty() |
| * |
| * We should call set_dirty_inode to write the dirty inode through write_inode. |
| */ |
| static void f2fs_dirty_inode(struct inode *inode, int flags) |
| { |
| set_inode_flag(F2FS_I(inode), FI_DIRTY_INODE); |
| return; |
| } |
| |
| static void f2fs_i_callback(struct rcu_head *head) |
| { |
| struct inode *inode = container_of(head, struct inode, i_rcu); |
| kmem_cache_free(f2fs_inode_cachep, F2FS_I(inode)); |
| } |
| |
| static void f2fs_destroy_inode(struct inode *inode) |
| { |
| call_rcu(&inode->i_rcu, f2fs_i_callback); |
| } |
| |
| static void f2fs_put_super(struct super_block *sb) |
| { |
| struct f2fs_sb_info *sbi = F2FS_SB(sb); |
| |
| if (sbi->s_proc) { |
| remove_proc_entry("segment_info", sbi->s_proc); |
| remove_proc_entry(sb->s_id, f2fs_proc_root); |
| } |
| kobject_del(&sbi->s_kobj); |
| |
| f2fs_destroy_stats(sbi); |
| stop_gc_thread(sbi); |
| |
| write_checkpoint(sbi, true); |
| |
| iput(sbi->node_inode); |
| iput(sbi->meta_inode); |
| |
| /* destroy f2fs internal modules */ |
| destroy_node_manager(sbi); |
| destroy_segment_manager(sbi); |
| |
| kfree(sbi->ckpt); |
| kobject_put(&sbi->s_kobj); |
| wait_for_completion(&sbi->s_kobj_unregister); |
| |
| sb->s_fs_info = NULL; |
| brelse(sbi->raw_super_buf); |
| kfree(sbi); |
| } |
| |
| int f2fs_sync_fs(struct super_block *sb, int sync) |
| { |
| struct f2fs_sb_info *sbi = F2FS_SB(sb); |
| |
| trace_f2fs_sync_fs(sb, sync); |
| |
| if (!sbi->s_dirty && !get_pages(sbi, F2FS_DIRTY_NODES)) |
| return 0; |
| |
| if (sync) { |
| mutex_lock(&sbi->gc_mutex); |
| write_checkpoint(sbi, false); |
| mutex_unlock(&sbi->gc_mutex); |
| } else { |
| f2fs_balance_fs(sbi); |
| } |
| |
| return 0; |
| } |
| |
| static int f2fs_freeze(struct super_block *sb) |
| { |
| int err; |
| |
| if (f2fs_readonly(sb)) |
| return 0; |
| |
| err = f2fs_sync_fs(sb, 1); |
| return err; |
| } |
| |
| static int f2fs_unfreeze(struct super_block *sb) |
| { |
| return 0; |
| } |
| |
| static int f2fs_statfs(struct dentry *dentry, struct kstatfs *buf) |
| { |
| struct super_block *sb = dentry->d_sb; |
| struct f2fs_sb_info *sbi = F2FS_SB(sb); |
| u64 id = huge_encode_dev(sb->s_bdev->bd_dev); |
| block_t total_count, user_block_count, start_count, ovp_count; |
| |
| total_count = le64_to_cpu(sbi->raw_super->block_count); |
| user_block_count = sbi->user_block_count; |
| start_count = le32_to_cpu(sbi->raw_super->segment0_blkaddr); |
| ovp_count = SM_I(sbi)->ovp_segments << sbi->log_blocks_per_seg; |
| buf->f_type = F2FS_SUPER_MAGIC; |
| buf->f_bsize = sbi->blocksize; |
| |
| buf->f_blocks = total_count - start_count; |
| buf->f_bfree = buf->f_blocks - valid_user_blocks(sbi) - ovp_count; |
| buf->f_bavail = user_block_count - valid_user_blocks(sbi); |
| |
| buf->f_files = sbi->total_node_count; |
| buf->f_ffree = sbi->total_node_count - valid_inode_count(sbi); |
| |
| buf->f_namelen = F2FS_NAME_LEN; |
| buf->f_fsid.val[0] = (u32)id; |
| buf->f_fsid.val[1] = (u32)(id >> 32); |
| |
| return 0; |
| } |
| |
| static int f2fs_show_options(struct seq_file *seq, struct dentry *root) |
| { |
| struct f2fs_sb_info *sbi = F2FS_SB(root->d_sb); |
| |
| if (!(root->d_sb->s_flags & MS_RDONLY) && test_opt(sbi, BG_GC)) |
| seq_printf(seq, ",background_gc=%s", "on"); |
| else |
| seq_printf(seq, ",background_gc=%s", "off"); |
| if (test_opt(sbi, DISABLE_ROLL_FORWARD)) |
| seq_puts(seq, ",disable_roll_forward"); |
| if (test_opt(sbi, DISCARD)) |
| seq_puts(seq, ",discard"); |
| if (test_opt(sbi, NOHEAP)) |
| seq_puts(seq, ",no_heap_alloc"); |
| #ifdef CONFIG_F2FS_FS_XATTR |
| if (test_opt(sbi, XATTR_USER)) |
| seq_puts(seq, ",user_xattr"); |
| else |
| seq_puts(seq, ",nouser_xattr"); |
| #endif |
| #ifdef CONFIG_F2FS_FS_POSIX_ACL |
| if (test_opt(sbi, POSIX_ACL)) |
| seq_puts(seq, ",acl"); |
| else |
| seq_puts(seq, ",noacl"); |
| #endif |
| if (test_opt(sbi, DISABLE_EXT_IDENTIFY)) |
| seq_puts(seq, ",disable_ext_identify"); |
| |
| seq_printf(seq, ",active_logs=%u", sbi->active_logs); |
| |
| return 0; |
| } |
| |
| static int segment_info_seq_show(struct seq_file *seq, void *offset) |
| { |
| struct super_block *sb = seq->private; |
| struct f2fs_sb_info *sbi = F2FS_SB(sb); |
| unsigned int total_segs = le32_to_cpu(sbi->raw_super->segment_count_main); |
| int i; |
| |
| for (i = 0; i < total_segs; i++) { |
| seq_printf(seq, "%u", get_valid_blocks(sbi, i, 1)); |
| if (i != 0 && (i % 10) == 0) |
| seq_puts(seq, "\n"); |
| else |
| seq_puts(seq, " "); |
| } |
| return 0; |
| } |
| |
| static int segment_info_open_fs(struct inode *inode, struct file *file) |
| { |
| return single_open(file, segment_info_seq_show, PDE_DATA(inode)); |
| } |
| |
| static const struct file_operations f2fs_seq_segment_info_fops = { |
| .owner = THIS_MODULE, |
| .open = segment_info_open_fs, |
| .read = seq_read, |
| .llseek = seq_lseek, |
| .release = single_release, |
| }; |
| |
| static int f2fs_remount(struct super_block *sb, int *flags, char *data) |
| { |
| struct f2fs_sb_info *sbi = F2FS_SB(sb); |
| struct f2fs_mount_info org_mount_opt; |
| int err, active_logs; |
| |
| /* |
| * Save the old mount options in case we |
| * need to restore them. |
| */ |
| org_mount_opt = sbi->mount_opt; |
| active_logs = sbi->active_logs; |
| |
| /* parse mount options */ |
| err = parse_options(sb, data); |
| if (err) |
| goto restore_opts; |
| |
| /* |
| * Previous and new state of filesystem is RO, |
| * so no point in checking GC conditions. |
| */ |
| if ((sb->s_flags & MS_RDONLY) && (*flags & MS_RDONLY)) |
| goto skip; |
| |
| /* |
| * We stop the GC thread if FS is mounted as RO |
| * or if background_gc = off is passed in mount |
| * option. Also sync the filesystem. |
| */ |
| if ((*flags & MS_RDONLY) || !test_opt(sbi, BG_GC)) { |
| if (sbi->gc_thread) { |
| stop_gc_thread(sbi); |
| f2fs_sync_fs(sb, 1); |
| } |
| } else if (test_opt(sbi, BG_GC) && !sbi->gc_thread) { |
| err = start_gc_thread(sbi); |
| if (err) |
| goto restore_opts; |
| } |
| skip: |
| /* Update the POSIXACL Flag */ |
| sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | |
| (test_opt(sbi, POSIX_ACL) ? MS_POSIXACL : 0); |
| return 0; |
| |
| restore_opts: |
| sbi->mount_opt = org_mount_opt; |
| sbi->active_logs = active_logs; |
| return err; |
| } |
| |
| static struct super_operations f2fs_sops = { |
| .alloc_inode = f2fs_alloc_inode, |
| .drop_inode = f2fs_drop_inode, |
| .destroy_inode = f2fs_destroy_inode, |
| .write_inode = f2fs_write_inode, |
| .dirty_inode = f2fs_dirty_inode, |
| .show_options = f2fs_show_options, |
| .evict_inode = f2fs_evict_inode, |
| .put_super = f2fs_put_super, |
| .sync_fs = f2fs_sync_fs, |
| .freeze_fs = f2fs_freeze, |
| .unfreeze_fs = f2fs_unfreeze, |
| .statfs = f2fs_statfs, |
| .remount_fs = f2fs_remount, |
| }; |
| |
| static struct inode *f2fs_nfs_get_inode(struct super_block *sb, |
| u64 ino, u32 generation) |
| { |
| struct f2fs_sb_info *sbi = F2FS_SB(sb); |
| struct inode *inode; |
| |
| if (ino < F2FS_ROOT_INO(sbi)) |
| return ERR_PTR(-ESTALE); |
| |
| /* |
| * f2fs_iget isn't quite right if the inode is currently unallocated! |
| * However f2fs_iget currently does appropriate checks to handle stale |
| * inodes so everything is OK. |
| */ |
| inode = f2fs_iget(sb, ino); |
| if (IS_ERR(inode)) |
| return ERR_CAST(inode); |
| if (generation && inode->i_generation != generation) { |
| /* we didn't find the right inode.. */ |
| iput(inode); |
| return ERR_PTR(-ESTALE); |
| } |
| return inode; |
| } |
| |
| static struct dentry *f2fs_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, |
| f2fs_nfs_get_inode); |
| } |
| |
| static struct dentry *f2fs_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, |
| f2fs_nfs_get_inode); |
| } |
| |
| static const struct export_operations f2fs_export_ops = { |
| .fh_to_dentry = f2fs_fh_to_dentry, |
| .fh_to_parent = f2fs_fh_to_parent, |
| .get_parent = f2fs_get_parent, |
| }; |
| |
| static loff_t max_file_size(unsigned bits) |
| { |
| loff_t result = ADDRS_PER_INODE; |
| loff_t leaf_count = ADDRS_PER_BLOCK; |
| |
| /* two direct node blocks */ |
| result += (leaf_count * 2); |
| |
| /* two indirect node blocks */ |
| leaf_count *= NIDS_PER_BLOCK; |
| result += (leaf_count * 2); |
| |
| /* one double indirect node block */ |
| leaf_count *= NIDS_PER_BLOCK; |
| result += leaf_count; |
| |
| result <<= bits; |
| return result; |
| } |
| |
| static int sanity_check_raw_super(struct super_block *sb, |
| struct f2fs_super_block *raw_super) |
| { |
| unsigned int blocksize; |
| |
| if (F2FS_SUPER_MAGIC != le32_to_cpu(raw_super->magic)) { |
| f2fs_msg(sb, KERN_INFO, |
| "Magic Mismatch, valid(0x%x) - read(0x%x)", |
| F2FS_SUPER_MAGIC, le32_to_cpu(raw_super->magic)); |
| return 1; |
| } |
| |
| /* Currently, support only 4KB page cache size */ |
| if (F2FS_BLKSIZE != PAGE_CACHE_SIZE) { |
| f2fs_msg(sb, KERN_INFO, |
| "Invalid page_cache_size (%lu), supports only 4KB\n", |
| PAGE_CACHE_SIZE); |
| return 1; |
| } |
| |
| /* Currently, support only 4KB block size */ |
| blocksize = 1 << le32_to_cpu(raw_super->log_blocksize); |
| if (blocksize != F2FS_BLKSIZE) { |
| f2fs_msg(sb, KERN_INFO, |
| "Invalid blocksize (%u), supports only 4KB\n", |
| blocksize); |
| return 1; |
| } |
| |
| if (le32_to_cpu(raw_super->log_sectorsize) != |
| F2FS_LOG_SECTOR_SIZE) { |
| f2fs_msg(sb, KERN_INFO, "Invalid log sectorsize"); |
| return 1; |
| } |
| if (le32_to_cpu(raw_super->log_sectors_per_block) != |
| F2FS_LOG_SECTORS_PER_BLOCK) { |
| f2fs_msg(sb, KERN_INFO, "Invalid log sectors per block"); |
| return 1; |
| } |
| return 0; |
| } |
| |
| static int sanity_check_ckpt(struct f2fs_sb_info *sbi) |
| { |
| unsigned int total, fsmeta; |
| struct f2fs_super_block *raw_super = F2FS_RAW_SUPER(sbi); |
| struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi); |
| |
| total = le32_to_cpu(raw_super->segment_count); |
| fsmeta = le32_to_cpu(raw_super->segment_count_ckpt); |
| fsmeta += le32_to_cpu(raw_super->segment_count_sit); |
| fsmeta += le32_to_cpu(raw_super->segment_count_nat); |
| fsmeta += le32_to_cpu(ckpt->rsvd_segment_count); |
| fsmeta += le32_to_cpu(raw_super->segment_count_ssa); |
| |
| if (fsmeta >= total) |
| return 1; |
| |
| if (is_set_ckpt_flags(ckpt, CP_ERROR_FLAG)) { |
| f2fs_msg(sbi->sb, KERN_ERR, "A bug case: need to run fsck"); |
| return 1; |
| } |
| return 0; |
| } |
| |
| static void init_sb_info(struct f2fs_sb_info *sbi) |
| { |
| struct f2fs_super_block *raw_super = sbi->raw_super; |
| int i; |
| |
| sbi->log_sectors_per_block = |
| le32_to_cpu(raw_super->log_sectors_per_block); |
| sbi->log_blocksize = le32_to_cpu(raw_super->log_blocksize); |
| sbi->blocksize = 1 << sbi->log_blocksize; |
| sbi->log_blocks_per_seg = le32_to_cpu(raw_super->log_blocks_per_seg); |
| sbi->blocks_per_seg = 1 << sbi->log_blocks_per_seg; |
| sbi->segs_per_sec = le32_to_cpu(raw_super->segs_per_sec); |
| sbi->secs_per_zone = le32_to_cpu(raw_super->secs_per_zone); |
| sbi->total_sections = le32_to_cpu(raw_super->section_count); |
| sbi->total_node_count = |
| (le32_to_cpu(raw_super->segment_count_nat) / 2) |
| * sbi->blocks_per_seg * NAT_ENTRY_PER_BLOCK; |
| sbi->root_ino_num = le32_to_cpu(raw_super->root_ino); |
| sbi->node_ino_num = le32_to_cpu(raw_super->node_ino); |
| sbi->meta_ino_num = le32_to_cpu(raw_super->meta_ino); |
| sbi->cur_victim_sec = NULL_SECNO; |
| |
| for (i = 0; i < NR_COUNT_TYPE; i++) |
| atomic_set(&sbi->nr_pages[i], 0); |
| } |
| |
| static int validate_superblock(struct super_block *sb, |
| struct f2fs_super_block **raw_super, |
| struct buffer_head **raw_super_buf, sector_t block) |
| { |
| const char *super = (block == 0 ? "first" : "second"); |
| |
| /* read f2fs raw super block */ |
| *raw_super_buf = sb_bread(sb, block); |
| if (!*raw_super_buf) { |
| f2fs_msg(sb, KERN_ERR, "unable to read %s superblock", |
| super); |
| return -EIO; |
| } |
| |
| *raw_super = (struct f2fs_super_block *) |
| ((char *)(*raw_super_buf)->b_data + F2FS_SUPER_OFFSET); |
| |
| /* sanity checking of raw super */ |
| if (!sanity_check_raw_super(sb, *raw_super)) |
| return 0; |
| |
| f2fs_msg(sb, KERN_ERR, "Can't find a valid F2FS filesystem " |
| "in %s superblock", super); |
| return -EINVAL; |
| } |
| |
| static int f2fs_fill_super(struct super_block *sb, void *data, int silent) |
| { |
| struct f2fs_sb_info *sbi; |
| struct f2fs_super_block *raw_super; |
| struct buffer_head *raw_super_buf; |
| struct inode *root; |
| long err = -EINVAL; |
| int i; |
| |
| /* allocate memory for f2fs-specific super block info */ |
| sbi = kzalloc(sizeof(struct f2fs_sb_info), GFP_KERNEL); |
| if (!sbi) |
| return -ENOMEM; |
| |
| /* set a block size */ |
| if (!sb_set_blocksize(sb, F2FS_BLKSIZE)) { |
| f2fs_msg(sb, KERN_ERR, "unable to set blocksize"); |
| goto free_sbi; |
| } |
| |
| err = validate_superblock(sb, &raw_super, &raw_super_buf, 0); |
| if (err) { |
| brelse(raw_super_buf); |
| /* check secondary superblock when primary failed */ |
| err = validate_superblock(sb, &raw_super, &raw_super_buf, 1); |
| if (err) |
| goto free_sb_buf; |
| } |
| sb->s_fs_info = sbi; |
| /* init some FS parameters */ |
| sbi->active_logs = NR_CURSEG_TYPE; |
| |
| set_opt(sbi, BG_GC); |
| |
| #ifdef CONFIG_F2FS_FS_XATTR |
| set_opt(sbi, XATTR_USER); |
| #endif |
| #ifdef CONFIG_F2FS_FS_POSIX_ACL |
| set_opt(sbi, POSIX_ACL); |
| #endif |
| /* parse mount options */ |
| err = parse_options(sb, (char *)data); |
| if (err) |
| goto free_sb_buf; |
| |
| sb->s_maxbytes = max_file_size(le32_to_cpu(raw_super->log_blocksize)); |
| sb->s_max_links = F2FS_LINK_MAX; |
| get_random_bytes(&sbi->s_next_generation, sizeof(u32)); |
| |
| sb->s_op = &f2fs_sops; |
| sb->s_xattr = f2fs_xattr_handlers; |
| sb->s_export_op = &f2fs_export_ops; |
| sb->s_magic = F2FS_SUPER_MAGIC; |
| sb->s_time_gran = 1; |
| sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | |
| (test_opt(sbi, POSIX_ACL) ? MS_POSIXACL : 0); |
| memcpy(sb->s_uuid, raw_super->uuid, sizeof(raw_super->uuid)); |
| |
| /* init f2fs-specific super block info */ |
| sbi->sb = sb; |
| sbi->raw_super = raw_super; |
| sbi->raw_super_buf = raw_super_buf; |
| mutex_init(&sbi->gc_mutex); |
| mutex_init(&sbi->writepages); |
| mutex_init(&sbi->cp_mutex); |
| for (i = 0; i < NR_GLOBAL_LOCKS; i++) |
| mutex_init(&sbi->fs_lock[i]); |
| mutex_init(&sbi->node_write); |
| sbi->por_doing = 0; |
| spin_lock_init(&sbi->stat_lock); |
| init_rwsem(&sbi->bio_sem); |
| init_sb_info(sbi); |
| |
| /* get an inode for meta space */ |
| sbi->meta_inode = f2fs_iget(sb, F2FS_META_INO(sbi)); |
| if (IS_ERR(sbi->meta_inode)) { |
| f2fs_msg(sb, KERN_ERR, "Failed to read F2FS meta data inode"); |
| err = PTR_ERR(sbi->meta_inode); |
| goto free_sb_buf; |
| } |
| |
| err = get_valid_checkpoint(sbi); |
| if (err) { |
| f2fs_msg(sb, KERN_ERR, "Failed to get valid F2FS checkpoint"); |
| goto free_meta_inode; |
| } |
| |
| /* sanity checking of checkpoint */ |
| err = -EINVAL; |
| if (sanity_check_ckpt(sbi)) { |
| f2fs_msg(sb, KERN_ERR, "Invalid F2FS checkpoint"); |
| goto free_cp; |
| } |
| |
| sbi->total_valid_node_count = |
| le32_to_cpu(sbi->ckpt->valid_node_count); |
| sbi->total_valid_inode_count = |
| le32_to_cpu(sbi->ckpt->valid_inode_count); |
| sbi->user_block_count = le64_to_cpu(sbi->ckpt->user_block_count); |
| sbi->total_valid_block_count = |
| le64_to_cpu(sbi->ckpt->valid_block_count); |
| sbi->last_valid_block_count = sbi->total_valid_block_count; |
| sbi->alloc_valid_block_count = 0; |
| INIT_LIST_HEAD(&sbi->dir_inode_list); |
| spin_lock_init(&sbi->dir_inode_lock); |
| |
| init_orphan_info(sbi); |
| |
| /* setup f2fs internal modules */ |
| err = build_segment_manager(sbi); |
| if (err) { |
| f2fs_msg(sb, KERN_ERR, |
| "Failed to initialize F2FS segment manager"); |
| goto free_sm; |
| } |
| err = build_node_manager(sbi); |
| if (err) { |
| f2fs_msg(sb, KERN_ERR, |
| "Failed to initialize F2FS node manager"); |
| goto free_nm; |
| } |
| |
| build_gc_manager(sbi); |
| |
| /* get an inode for node space */ |
| sbi->node_inode = f2fs_iget(sb, F2FS_NODE_INO(sbi)); |
| if (IS_ERR(sbi->node_inode)) { |
| f2fs_msg(sb, KERN_ERR, "Failed to read node inode"); |
| err = PTR_ERR(sbi->node_inode); |
| goto free_nm; |
| } |
| |
| /* if there are nt orphan nodes free them */ |
| err = -EINVAL; |
| if (recover_orphan_inodes(sbi)) |
| goto free_node_inode; |
| |
| /* read root inode and dentry */ |
| root = f2fs_iget(sb, F2FS_ROOT_INO(sbi)); |
| if (IS_ERR(root)) { |
| f2fs_msg(sb, KERN_ERR, "Failed to read root inode"); |
| err = PTR_ERR(root); |
| goto free_node_inode; |
| } |
| if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) |
| goto free_root_inode; |
| |
| sb->s_root = d_make_root(root); /* allocate root dentry */ |
| if (!sb->s_root) { |
| err = -ENOMEM; |
| goto free_root_inode; |
| } |
| |
| /* recover fsynced data */ |
| if (!test_opt(sbi, DISABLE_ROLL_FORWARD)) { |
| err = recover_fsync_data(sbi); |
| if (err) |
| f2fs_msg(sb, KERN_ERR, |
| "Cannot recover all fsync data errno=%ld", err); |
| } |
| |
| /* |
| * If filesystem is not mounted as read-only then |
| * do start the gc_thread. |
| */ |
| if (!(sb->s_flags & MS_RDONLY)) { |
| /* After POR, we can run background GC thread.*/ |
| err = start_gc_thread(sbi); |
| if (err) |
| goto fail; |
| } |
| |
| err = f2fs_build_stats(sbi); |
| if (err) |
| goto fail; |
| |
| if (f2fs_proc_root) |
| sbi->s_proc = proc_mkdir(sb->s_id, f2fs_proc_root); |
| |
| if (sbi->s_proc) |
| proc_create_data("segment_info", S_IRUGO, sbi->s_proc, |
| &f2fs_seq_segment_info_fops, sb); |
| |
| if (test_opt(sbi, DISCARD)) { |
| struct request_queue *q = bdev_get_queue(sb->s_bdev); |
| if (!blk_queue_discard(q)) |
| f2fs_msg(sb, KERN_WARNING, |
| "mounting with \"discard\" option, but " |
| "the device does not support discard"); |
| } |
| |
| sbi->s_kobj.kset = f2fs_kset; |
| init_completion(&sbi->s_kobj_unregister); |
| err = kobject_init_and_add(&sbi->s_kobj, &f2fs_ktype, NULL, |
| "%s", sb->s_id); |
| if (err) |
| goto fail; |
| |
| return 0; |
| fail: |
| stop_gc_thread(sbi); |
| free_root_inode: |
| dput(sb->s_root); |
| sb->s_root = NULL; |
| free_node_inode: |
| iput(sbi->node_inode); |
| free_nm: |
| destroy_node_manager(sbi); |
| free_sm: |
| destroy_segment_manager(sbi); |
| free_cp: |
| kfree(sbi->ckpt); |
| free_meta_inode: |
| make_bad_inode(sbi->meta_inode); |
| iput(sbi->meta_inode); |
| free_sb_buf: |
| brelse(raw_super_buf); |
| free_sbi: |
| kfree(sbi); |
| return err; |
| } |
| |
| static struct dentry *f2fs_mount(struct file_system_type *fs_type, int flags, |
| const char *dev_name, void *data) |
| { |
| return mount_bdev(fs_type, flags, dev_name, data, f2fs_fill_super); |
| } |
| |
| static struct file_system_type f2fs_fs_type = { |
| .owner = THIS_MODULE, |
| .name = "f2fs", |
| .mount = f2fs_mount, |
| .kill_sb = kill_block_super, |
| .fs_flags = FS_REQUIRES_DEV, |
| }; |
| MODULE_ALIAS_FS("f2fs"); |
| |
| static int __init init_inodecache(void) |
| { |
| f2fs_inode_cachep = f2fs_kmem_cache_create("f2fs_inode_cache", |
| sizeof(struct f2fs_inode_info), NULL); |
| if (f2fs_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(f2fs_inode_cachep); |
| } |
| |
| static int __init init_f2fs_fs(void) |
| { |
| int err; |
| |
| err = init_inodecache(); |
| if (err) |
| goto fail; |
| err = create_node_manager_caches(); |
| if (err) |
| goto fail; |
| err = create_gc_caches(); |
| if (err) |
| goto fail; |
| err = create_checkpoint_caches(); |
| if (err) |
| goto fail; |
| f2fs_kset = kset_create_and_add("f2fs", NULL, fs_kobj); |
| if (!f2fs_kset) |
| goto fail; |
| err = register_filesystem(&f2fs_fs_type); |
| if (err) |
| goto fail; |
| f2fs_create_root_stats(); |
| f2fs_proc_root = proc_mkdir("fs/f2fs", NULL); |
| fail: |
| return err; |
| } |
| |
| static void __exit exit_f2fs_fs(void) |
| { |
| remove_proc_entry("fs/f2fs", NULL); |
| f2fs_destroy_root_stats(); |
| unregister_filesystem(&f2fs_fs_type); |
| destroy_checkpoint_caches(); |
| destroy_gc_caches(); |
| destroy_node_manager_caches(); |
| destroy_inodecache(); |
| kset_unregister(f2fs_kset); |
| } |
| |
| module_init(init_f2fs_fs) |
| module_exit(exit_f2fs_fs) |
| |
| MODULE_AUTHOR("Samsung Electronics's Praesto Team"); |
| MODULE_DESCRIPTION("Flash Friendly File System"); |
| MODULE_LICENSE("GPL"); |