| /* |
| * linux/fs/hfsplus/super.c |
| * |
| * Copyright (C) 2001 |
| * Brad Boyer (flar@allandria.com) |
| * (C) 2003 Ardis Technologies <roman@ardistech.com> |
| * |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/init.h> |
| #include <linux/pagemap.h> |
| #include <linux/blkdev.h> |
| #include <linux/fs.h> |
| #include <linux/slab.h> |
| #include <linux/vfs.h> |
| #include <linux/nls.h> |
| |
| static struct inode *hfsplus_alloc_inode(struct super_block *sb); |
| static void hfsplus_destroy_inode(struct inode *inode); |
| |
| #include "hfsplus_fs.h" |
| |
| static int hfsplus_system_read_inode(struct inode *inode) |
| { |
| struct hfsplus_vh *vhdr = HFSPLUS_SB(inode->i_sb)->s_vhdr; |
| |
| switch (inode->i_ino) { |
| case HFSPLUS_EXT_CNID: |
| hfsplus_inode_read_fork(inode, &vhdr->ext_file); |
| inode->i_mapping->a_ops = &hfsplus_btree_aops; |
| break; |
| case HFSPLUS_CAT_CNID: |
| hfsplus_inode_read_fork(inode, &vhdr->cat_file); |
| inode->i_mapping->a_ops = &hfsplus_btree_aops; |
| break; |
| case HFSPLUS_ALLOC_CNID: |
| hfsplus_inode_read_fork(inode, &vhdr->alloc_file); |
| inode->i_mapping->a_ops = &hfsplus_aops; |
| break; |
| case HFSPLUS_START_CNID: |
| hfsplus_inode_read_fork(inode, &vhdr->start_file); |
| break; |
| case HFSPLUS_ATTR_CNID: |
| hfsplus_inode_read_fork(inode, &vhdr->attr_file); |
| inode->i_mapping->a_ops = &hfsplus_btree_aops; |
| break; |
| default: |
| return -EIO; |
| } |
| |
| return 0; |
| } |
| |
| struct inode *hfsplus_iget(struct super_block *sb, unsigned long ino) |
| { |
| struct hfs_find_data fd; |
| struct inode *inode; |
| int err; |
| |
| inode = iget_locked(sb, ino); |
| if (!inode) |
| return ERR_PTR(-ENOMEM); |
| if (!(inode->i_state & I_NEW)) |
| return inode; |
| |
| INIT_LIST_HEAD(&HFSPLUS_I(inode)->open_dir_list); |
| mutex_init(&HFSPLUS_I(inode)->extents_lock); |
| HFSPLUS_I(inode)->flags = 0; |
| HFSPLUS_I(inode)->extent_state = 0; |
| HFSPLUS_I(inode)->rsrc_inode = NULL; |
| atomic_set(&HFSPLUS_I(inode)->opencnt, 0); |
| |
| if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID || |
| inode->i_ino == HFSPLUS_ROOT_CNID) { |
| hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &fd); |
| err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd); |
| if (!err) |
| err = hfsplus_cat_read_inode(inode, &fd); |
| hfs_find_exit(&fd); |
| } else { |
| err = hfsplus_system_read_inode(inode); |
| } |
| |
| if (err) { |
| iget_failed(inode); |
| return ERR_PTR(err); |
| } |
| |
| unlock_new_inode(inode); |
| return inode; |
| } |
| |
| static int hfsplus_system_write_inode(struct inode *inode) |
| { |
| struct hfsplus_sb_info *sbi = HFSPLUS_SB(inode->i_sb); |
| struct hfsplus_vh *vhdr = sbi->s_vhdr; |
| struct hfsplus_fork_raw *fork; |
| struct hfs_btree *tree = NULL; |
| |
| switch (inode->i_ino) { |
| case HFSPLUS_EXT_CNID: |
| fork = &vhdr->ext_file; |
| tree = sbi->ext_tree; |
| break; |
| case HFSPLUS_CAT_CNID: |
| fork = &vhdr->cat_file; |
| tree = sbi->cat_tree; |
| break; |
| case HFSPLUS_ALLOC_CNID: |
| fork = &vhdr->alloc_file; |
| break; |
| case HFSPLUS_START_CNID: |
| fork = &vhdr->start_file; |
| break; |
| case HFSPLUS_ATTR_CNID: |
| fork = &vhdr->attr_file; |
| tree = sbi->attr_tree; |
| default: |
| return -EIO; |
| } |
| |
| if (fork->total_size != cpu_to_be64(inode->i_size)) { |
| set_bit(HFSPLUS_SB_WRITEBACKUP, &sbi->flags); |
| inode->i_sb->s_dirt = 1; |
| } |
| hfsplus_inode_write_fork(inode, fork); |
| if (tree) |
| hfs_btree_write(tree); |
| return 0; |
| } |
| |
| static int hfsplus_write_inode(struct inode *inode, |
| struct writeback_control *wbc) |
| { |
| dprint(DBG_INODE, "hfsplus_write_inode: %lu\n", inode->i_ino); |
| |
| hfsplus_ext_write_extent(inode); |
| |
| if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID || |
| inode->i_ino == HFSPLUS_ROOT_CNID) |
| return hfsplus_cat_write_inode(inode); |
| else |
| return hfsplus_system_write_inode(inode); |
| } |
| |
| static void hfsplus_evict_inode(struct inode *inode) |
| { |
| dprint(DBG_INODE, "hfsplus_evict_inode: %lu\n", inode->i_ino); |
| truncate_inode_pages(&inode->i_data, 0); |
| end_writeback(inode); |
| if (HFSPLUS_IS_RSRC(inode)) { |
| HFSPLUS_I(HFSPLUS_I(inode)->rsrc_inode)->rsrc_inode = NULL; |
| iput(HFSPLUS_I(inode)->rsrc_inode); |
| } |
| } |
| |
| int hfsplus_sync_fs(struct super_block *sb, int wait) |
| { |
| struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb); |
| struct hfsplus_vh *vhdr = sbi->s_vhdr; |
| int write_backup = 0; |
| int error, error2; |
| |
| if (!wait) |
| return 0; |
| |
| dprint(DBG_SUPER, "hfsplus_write_super\n"); |
| |
| sb->s_dirt = 0; |
| |
| /* |
| * Explicitly write out the special metadata inodes. |
| * |
| * While these special inodes are marked as hashed and written |
| * out peridocically by the flusher threads we redirty them |
| * during writeout of normal inodes, and thus the life lock |
| * prevents us from getting the latest state to disk. |
| */ |
| error = filemap_write_and_wait(sbi->cat_tree->inode->i_mapping); |
| error2 = filemap_write_and_wait(sbi->ext_tree->inode->i_mapping); |
| if (!error) |
| error = error2; |
| error2 = filemap_write_and_wait(sbi->alloc_file->i_mapping); |
| if (!error) |
| error = error2; |
| |
| mutex_lock(&sbi->vh_mutex); |
| mutex_lock(&sbi->alloc_mutex); |
| vhdr->free_blocks = cpu_to_be32(sbi->free_blocks); |
| vhdr->next_cnid = cpu_to_be32(sbi->next_cnid); |
| vhdr->folder_count = cpu_to_be32(sbi->folder_count); |
| vhdr->file_count = cpu_to_be32(sbi->file_count); |
| |
| if (test_and_clear_bit(HFSPLUS_SB_WRITEBACKUP, &sbi->flags)) { |
| memcpy(sbi->s_backup_vhdr, sbi->s_vhdr, sizeof(*sbi->s_vhdr)); |
| write_backup = 1; |
| } |
| |
| error2 = hfsplus_submit_bio(sb, |
| sbi->part_start + HFSPLUS_VOLHEAD_SECTOR, |
| sbi->s_vhdr_buf, NULL, WRITE_SYNC); |
| if (!error) |
| error = error2; |
| if (!write_backup) |
| goto out; |
| |
| error2 = hfsplus_submit_bio(sb, |
| sbi->part_start + sbi->sect_count - 2, |
| sbi->s_backup_vhdr_buf, NULL, WRITE_SYNC); |
| if (!error) |
| error2 = error; |
| out: |
| mutex_unlock(&sbi->alloc_mutex); |
| mutex_unlock(&sbi->vh_mutex); |
| |
| if (!test_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags)) |
| blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL); |
| |
| return error; |
| } |
| |
| static void hfsplus_write_super(struct super_block *sb) |
| { |
| if (!(sb->s_flags & MS_RDONLY)) |
| hfsplus_sync_fs(sb, 1); |
| else |
| sb->s_dirt = 0; |
| } |
| |
| static void hfsplus_put_super(struct super_block *sb) |
| { |
| struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb); |
| |
| dprint(DBG_SUPER, "hfsplus_put_super\n"); |
| |
| if (!sb->s_fs_info) |
| return; |
| |
| if (!(sb->s_flags & MS_RDONLY) && sbi->s_vhdr) { |
| struct hfsplus_vh *vhdr = sbi->s_vhdr; |
| |
| vhdr->modify_date = hfsp_now2mt(); |
| vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_UNMNT); |
| vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_INCNSTNT); |
| |
| hfsplus_sync_fs(sb, 1); |
| } |
| |
| hfs_btree_close(sbi->cat_tree); |
| hfs_btree_close(sbi->ext_tree); |
| iput(sbi->alloc_file); |
| iput(sbi->hidden_dir); |
| kfree(sbi->s_vhdr_buf); |
| kfree(sbi->s_backup_vhdr_buf); |
| unload_nls(sbi->nls); |
| kfree(sb->s_fs_info); |
| sb->s_fs_info = NULL; |
| } |
| |
| static int hfsplus_statfs(struct dentry *dentry, struct kstatfs *buf) |
| { |
| struct super_block *sb = dentry->d_sb; |
| struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb); |
| u64 id = huge_encode_dev(sb->s_bdev->bd_dev); |
| |
| buf->f_type = HFSPLUS_SUPER_MAGIC; |
| buf->f_bsize = sb->s_blocksize; |
| buf->f_blocks = sbi->total_blocks << sbi->fs_shift; |
| buf->f_bfree = sbi->free_blocks << sbi->fs_shift; |
| buf->f_bavail = buf->f_bfree; |
| buf->f_files = 0xFFFFFFFF; |
| buf->f_ffree = 0xFFFFFFFF - sbi->next_cnid; |
| buf->f_fsid.val[0] = (u32)id; |
| buf->f_fsid.val[1] = (u32)(id >> 32); |
| buf->f_namelen = HFSPLUS_MAX_STRLEN; |
| |
| return 0; |
| } |
| |
| static int hfsplus_remount(struct super_block *sb, int *flags, char *data) |
| { |
| if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) |
| return 0; |
| if (!(*flags & MS_RDONLY)) { |
| struct hfsplus_vh *vhdr = HFSPLUS_SB(sb)->s_vhdr; |
| int force = 0; |
| |
| if (!hfsplus_parse_options_remount(data, &force)) |
| return -EINVAL; |
| |
| if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) { |
| printk(KERN_WARNING "hfs: filesystem was " |
| "not cleanly unmounted, " |
| "running fsck.hfsplus is recommended. " |
| "leaving read-only.\n"); |
| sb->s_flags |= MS_RDONLY; |
| *flags |= MS_RDONLY; |
| } else if (force) { |
| /* nothing */ |
| } else if (vhdr->attributes & |
| cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) { |
| printk(KERN_WARNING "hfs: filesystem is marked locked, " |
| "leaving read-only.\n"); |
| sb->s_flags |= MS_RDONLY; |
| *flags |= MS_RDONLY; |
| } else if (vhdr->attributes & |
| cpu_to_be32(HFSPLUS_VOL_JOURNALED)) { |
| printk(KERN_WARNING "hfs: filesystem is " |
| "marked journaled, " |
| "leaving read-only.\n"); |
| sb->s_flags |= MS_RDONLY; |
| *flags |= MS_RDONLY; |
| } |
| } |
| return 0; |
| } |
| |
| static const struct super_operations hfsplus_sops = { |
| .alloc_inode = hfsplus_alloc_inode, |
| .destroy_inode = hfsplus_destroy_inode, |
| .write_inode = hfsplus_write_inode, |
| .evict_inode = hfsplus_evict_inode, |
| .put_super = hfsplus_put_super, |
| .write_super = hfsplus_write_super, |
| .sync_fs = hfsplus_sync_fs, |
| .statfs = hfsplus_statfs, |
| .remount_fs = hfsplus_remount, |
| .show_options = hfsplus_show_options, |
| }; |
| |
| static int hfsplus_fill_super(struct super_block *sb, void *data, int silent) |
| { |
| struct hfsplus_vh *vhdr; |
| struct hfsplus_sb_info *sbi; |
| hfsplus_cat_entry entry; |
| struct hfs_find_data fd; |
| struct inode *root, *inode; |
| struct qstr str; |
| struct nls_table *nls = NULL; |
| int err; |
| |
| err = -EINVAL; |
| sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); |
| if (!sbi) |
| goto out; |
| |
| sb->s_fs_info = sbi; |
| mutex_init(&sbi->alloc_mutex); |
| mutex_init(&sbi->vh_mutex); |
| hfsplus_fill_defaults(sbi); |
| |
| err = -EINVAL; |
| if (!hfsplus_parse_options(data, sbi)) { |
| printk(KERN_ERR "hfs: unable to parse mount options\n"); |
| goto out_unload_nls; |
| } |
| |
| /* temporarily use utf8 to correctly find the hidden dir below */ |
| nls = sbi->nls; |
| sbi->nls = load_nls("utf8"); |
| if (!sbi->nls) { |
| printk(KERN_ERR "hfs: unable to load nls for utf8\n"); |
| goto out_unload_nls; |
| } |
| |
| /* Grab the volume header */ |
| if (hfsplus_read_wrapper(sb)) { |
| if (!silent) |
| printk(KERN_WARNING "hfs: unable to find HFS+ superblock\n"); |
| goto out_unload_nls; |
| } |
| vhdr = sbi->s_vhdr; |
| |
| /* Copy parts of the volume header into the superblock */ |
| sb->s_magic = HFSPLUS_VOLHEAD_SIG; |
| if (be16_to_cpu(vhdr->version) < HFSPLUS_MIN_VERSION || |
| be16_to_cpu(vhdr->version) > HFSPLUS_CURRENT_VERSION) { |
| printk(KERN_ERR "hfs: wrong filesystem version\n"); |
| goto out_free_vhdr; |
| } |
| sbi->total_blocks = be32_to_cpu(vhdr->total_blocks); |
| sbi->free_blocks = be32_to_cpu(vhdr->free_blocks); |
| sbi->next_cnid = be32_to_cpu(vhdr->next_cnid); |
| sbi->file_count = be32_to_cpu(vhdr->file_count); |
| sbi->folder_count = be32_to_cpu(vhdr->folder_count); |
| sbi->data_clump_blocks = |
| be32_to_cpu(vhdr->data_clump_sz) >> sbi->alloc_blksz_shift; |
| if (!sbi->data_clump_blocks) |
| sbi->data_clump_blocks = 1; |
| sbi->rsrc_clump_blocks = |
| be32_to_cpu(vhdr->rsrc_clump_sz) >> sbi->alloc_blksz_shift; |
| if (!sbi->rsrc_clump_blocks) |
| sbi->rsrc_clump_blocks = 1; |
| |
| /* Set up operations so we can load metadata */ |
| sb->s_op = &hfsplus_sops; |
| sb->s_maxbytes = MAX_LFS_FILESIZE; |
| |
| if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) { |
| printk(KERN_WARNING "hfs: Filesystem was " |
| "not cleanly unmounted, " |
| "running fsck.hfsplus is recommended. " |
| "mounting read-only.\n"); |
| sb->s_flags |= MS_RDONLY; |
| } else if (test_and_clear_bit(HFSPLUS_SB_FORCE, &sbi->flags)) { |
| /* nothing */ |
| } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) { |
| printk(KERN_WARNING "hfs: Filesystem is marked locked, mounting read-only.\n"); |
| sb->s_flags |= MS_RDONLY; |
| } else if ((vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_JOURNALED)) && |
| !(sb->s_flags & MS_RDONLY)) { |
| printk(KERN_WARNING "hfs: write access to " |
| "a journaled filesystem is not supported, " |
| "use the force option at your own risk, " |
| "mounting read-only.\n"); |
| sb->s_flags |= MS_RDONLY; |
| } |
| |
| /* Load metadata objects (B*Trees) */ |
| sbi->ext_tree = hfs_btree_open(sb, HFSPLUS_EXT_CNID); |
| if (!sbi->ext_tree) { |
| printk(KERN_ERR "hfs: failed to load extents file\n"); |
| goto out_free_vhdr; |
| } |
| sbi->cat_tree = hfs_btree_open(sb, HFSPLUS_CAT_CNID); |
| if (!sbi->cat_tree) { |
| printk(KERN_ERR "hfs: failed to load catalog file\n"); |
| goto out_close_ext_tree; |
| } |
| |
| inode = hfsplus_iget(sb, HFSPLUS_ALLOC_CNID); |
| if (IS_ERR(inode)) { |
| printk(KERN_ERR "hfs: failed to load allocation file\n"); |
| err = PTR_ERR(inode); |
| goto out_close_cat_tree; |
| } |
| sbi->alloc_file = inode; |
| |
| /* Load the root directory */ |
| root = hfsplus_iget(sb, HFSPLUS_ROOT_CNID); |
| if (IS_ERR(root)) { |
| printk(KERN_ERR "hfs: failed to load root directory\n"); |
| err = PTR_ERR(root); |
| goto out_put_alloc_file; |
| } |
| |
| str.len = sizeof(HFSP_HIDDENDIR_NAME) - 1; |
| str.name = HFSP_HIDDENDIR_NAME; |
| hfs_find_init(sbi->cat_tree, &fd); |
| hfsplus_cat_build_key(sb, fd.search_key, HFSPLUS_ROOT_CNID, &str); |
| if (!hfs_brec_read(&fd, &entry, sizeof(entry))) { |
| hfs_find_exit(&fd); |
| if (entry.type != cpu_to_be16(HFSPLUS_FOLDER)) |
| goto out_put_root; |
| inode = hfsplus_iget(sb, be32_to_cpu(entry.folder.id)); |
| if (IS_ERR(inode)) { |
| err = PTR_ERR(inode); |
| goto out_put_root; |
| } |
| sbi->hidden_dir = inode; |
| } else |
| hfs_find_exit(&fd); |
| |
| if (!(sb->s_flags & MS_RDONLY)) { |
| /* |
| * H+LX == hfsplusutils, H+Lx == this driver, H+lx is unused |
| * all three are registered with Apple for our use |
| */ |
| vhdr->last_mount_vers = cpu_to_be32(HFSP_MOUNT_VERSION); |
| vhdr->modify_date = hfsp_now2mt(); |
| be32_add_cpu(&vhdr->write_count, 1); |
| vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_UNMNT); |
| vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_INCNSTNT); |
| hfsplus_sync_fs(sb, 1); |
| |
| if (!sbi->hidden_dir) { |
| mutex_lock(&sbi->vh_mutex); |
| sbi->hidden_dir = hfsplus_new_inode(sb, S_IFDIR); |
| hfsplus_create_cat(sbi->hidden_dir->i_ino, root, &str, |
| sbi->hidden_dir); |
| mutex_unlock(&sbi->vh_mutex); |
| |
| hfsplus_mark_inode_dirty(sbi->hidden_dir, |
| HFSPLUS_I_CAT_DIRTY); |
| } |
| } |
| |
| sb->s_d_op = &hfsplus_dentry_operations; |
| sb->s_root = d_alloc_root(root); |
| if (!sb->s_root) { |
| err = -ENOMEM; |
| goto out_put_hidden_dir; |
| } |
| |
| unload_nls(sbi->nls); |
| sbi->nls = nls; |
| return 0; |
| |
| out_put_hidden_dir: |
| iput(sbi->hidden_dir); |
| out_put_root: |
| iput(root); |
| out_put_alloc_file: |
| iput(sbi->alloc_file); |
| out_close_cat_tree: |
| hfs_btree_close(sbi->cat_tree); |
| out_close_ext_tree: |
| hfs_btree_close(sbi->ext_tree); |
| out_free_vhdr: |
| kfree(sbi->s_vhdr); |
| kfree(sbi->s_backup_vhdr); |
| out_unload_nls: |
| unload_nls(sbi->nls); |
| unload_nls(nls); |
| kfree(sbi); |
| out: |
| return err; |
| } |
| |
| MODULE_AUTHOR("Brad Boyer"); |
| MODULE_DESCRIPTION("Extended Macintosh Filesystem"); |
| MODULE_LICENSE("GPL"); |
| |
| static struct kmem_cache *hfsplus_inode_cachep; |
| |
| static struct inode *hfsplus_alloc_inode(struct super_block *sb) |
| { |
| struct hfsplus_inode_info *i; |
| |
| i = kmem_cache_alloc(hfsplus_inode_cachep, GFP_KERNEL); |
| return i ? &i->vfs_inode : NULL; |
| } |
| |
| static void hfsplus_i_callback(struct rcu_head *head) |
| { |
| struct inode *inode = container_of(head, struct inode, i_rcu); |
| |
| INIT_LIST_HEAD(&inode->i_dentry); |
| kmem_cache_free(hfsplus_inode_cachep, HFSPLUS_I(inode)); |
| } |
| |
| static void hfsplus_destroy_inode(struct inode *inode) |
| { |
| call_rcu(&inode->i_rcu, hfsplus_i_callback); |
| } |
| |
| #define HFSPLUS_INODE_SIZE sizeof(struct hfsplus_inode_info) |
| |
| static struct dentry *hfsplus_mount(struct file_system_type *fs_type, |
| int flags, const char *dev_name, void *data) |
| { |
| return mount_bdev(fs_type, flags, dev_name, data, hfsplus_fill_super); |
| } |
| |
| static struct file_system_type hfsplus_fs_type = { |
| .owner = THIS_MODULE, |
| .name = "hfsplus", |
| .mount = hfsplus_mount, |
| .kill_sb = kill_block_super, |
| .fs_flags = FS_REQUIRES_DEV, |
| }; |
| |
| static void hfsplus_init_once(void *p) |
| { |
| struct hfsplus_inode_info *i = p; |
| |
| inode_init_once(&i->vfs_inode); |
| } |
| |
| static int __init init_hfsplus_fs(void) |
| { |
| int err; |
| |
| hfsplus_inode_cachep = kmem_cache_create("hfsplus_icache", |
| HFSPLUS_INODE_SIZE, 0, SLAB_HWCACHE_ALIGN, |
| hfsplus_init_once); |
| if (!hfsplus_inode_cachep) |
| return -ENOMEM; |
| err = register_filesystem(&hfsplus_fs_type); |
| if (err) |
| kmem_cache_destroy(hfsplus_inode_cachep); |
| return err; |
| } |
| |
| static void __exit exit_hfsplus_fs(void) |
| { |
| unregister_filesystem(&hfsplus_fs_type); |
| kmem_cache_destroy(hfsplus_inode_cachep); |
| } |
| |
| module_init(init_hfsplus_fs) |
| module_exit(exit_hfsplus_fs) |