| /* |
| * linux/fs/hfsplus/super.c |
| * |
| * Copyright (C) 2001 |
| * Brad Boyer (flar@allandria.com) |
| * (C) 2003 Ardis Technologies <roman@ardistech.com> |
| * |
| */ |
| |
| #include <linux/config.h> |
| #include <linux/module.h> |
| #include <linux/init.h> |
| #include <linux/pagemap.h> |
| #include <linux/fs.h> |
| #include <linux/sched.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 void hfsplus_read_inode(struct inode *inode) |
| { |
| struct hfs_find_data fd; |
| struct hfsplus_vh *vhdr; |
| int err; |
| |
| INIT_LIST_HEAD(&HFSPLUS_I(inode).open_dir_list); |
| init_MUTEX(&HFSPLUS_I(inode).extents_lock); |
| HFSPLUS_I(inode).flags = 0; |
| HFSPLUS_I(inode).rsrc_inode = NULL; |
| atomic_set(&HFSPLUS_I(inode).opencnt, 0); |
| |
| if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID) { |
| read_inode: |
| 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); |
| if (err) |
| goto bad_inode; |
| return; |
| } |
| vhdr = HFSPLUS_SB(inode->i_sb).s_vhdr; |
| switch(inode->i_ino) { |
| case HFSPLUS_ROOT_CNID: |
| goto read_inode; |
| 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: |
| goto bad_inode; |
| } |
| |
| return; |
| |
| bad_inode: |
| make_bad_inode(inode); |
| } |
| |
| static int hfsplus_write_inode(struct inode *inode, int unused) |
| { |
| struct hfsplus_vh *vhdr; |
| int ret = 0; |
| |
| dprint(DBG_INODE, "hfsplus_write_inode: %lu\n", inode->i_ino); |
| hfsplus_ext_write_extent(inode); |
| if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID) { |
| return hfsplus_cat_write_inode(inode); |
| } |
| vhdr = HFSPLUS_SB(inode->i_sb).s_vhdr; |
| switch (inode->i_ino) { |
| case HFSPLUS_ROOT_CNID: |
| ret = hfsplus_cat_write_inode(inode); |
| break; |
| case HFSPLUS_EXT_CNID: |
| if (vhdr->ext_file.total_size != cpu_to_be64(inode->i_size)) { |
| HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP; |
| inode->i_sb->s_dirt = 1; |
| } |
| hfsplus_inode_write_fork(inode, &vhdr->ext_file); |
| hfs_btree_write(HFSPLUS_SB(inode->i_sb).ext_tree); |
| break; |
| case HFSPLUS_CAT_CNID: |
| if (vhdr->cat_file.total_size != cpu_to_be64(inode->i_size)) { |
| HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP; |
| inode->i_sb->s_dirt = 1; |
| } |
| hfsplus_inode_write_fork(inode, &vhdr->cat_file); |
| hfs_btree_write(HFSPLUS_SB(inode->i_sb).cat_tree); |
| break; |
| case HFSPLUS_ALLOC_CNID: |
| if (vhdr->alloc_file.total_size != cpu_to_be64(inode->i_size)) { |
| HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP; |
| inode->i_sb->s_dirt = 1; |
| } |
| hfsplus_inode_write_fork(inode, &vhdr->alloc_file); |
| break; |
| case HFSPLUS_START_CNID: |
| if (vhdr->start_file.total_size != cpu_to_be64(inode->i_size)) { |
| HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP; |
| inode->i_sb->s_dirt = 1; |
| } |
| hfsplus_inode_write_fork(inode, &vhdr->start_file); |
| break; |
| case HFSPLUS_ATTR_CNID: |
| if (vhdr->attr_file.total_size != cpu_to_be64(inode->i_size)) { |
| HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP; |
| inode->i_sb->s_dirt = 1; |
| } |
| hfsplus_inode_write_fork(inode, &vhdr->attr_file); |
| hfs_btree_write(HFSPLUS_SB(inode->i_sb).attr_tree); |
| break; |
| } |
| return ret; |
| } |
| |
| static void hfsplus_clear_inode(struct inode *inode) |
| { |
| dprint(DBG_INODE, "hfsplus_clear_inode: %lu\n", inode->i_ino); |
| if (HFSPLUS_IS_RSRC(inode)) { |
| HFSPLUS_I(HFSPLUS_I(inode).rsrc_inode).rsrc_inode = NULL; |
| iput(HFSPLUS_I(inode).rsrc_inode); |
| } |
| } |
| |
| static void hfsplus_write_super(struct super_block *sb) |
| { |
| struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr; |
| |
| dprint(DBG_SUPER, "hfsplus_write_super\n"); |
| sb->s_dirt = 0; |
| if (sb->s_flags & MS_RDONLY) |
| /* warn? */ |
| return; |
| |
| vhdr->free_blocks = cpu_to_be32(HFSPLUS_SB(sb).free_blocks); |
| vhdr->next_alloc = cpu_to_be32(HFSPLUS_SB(sb).next_alloc); |
| vhdr->next_cnid = cpu_to_be32(HFSPLUS_SB(sb).next_cnid); |
| vhdr->folder_count = cpu_to_be32(HFSPLUS_SB(sb).folder_count); |
| vhdr->file_count = cpu_to_be32(HFSPLUS_SB(sb).file_count); |
| |
| mark_buffer_dirty(HFSPLUS_SB(sb).s_vhbh); |
| if (HFSPLUS_SB(sb).flags & HFSPLUS_SB_WRITEBACKUP) { |
| if (HFSPLUS_SB(sb).sect_count) { |
| struct buffer_head *bh; |
| u32 block, offset; |
| |
| block = HFSPLUS_SB(sb).blockoffset; |
| block += (HFSPLUS_SB(sb).sect_count - 2) >> (sb->s_blocksize_bits - 9); |
| offset = ((HFSPLUS_SB(sb).sect_count - 2) << 9) & (sb->s_blocksize - 1); |
| printk(KERN_DEBUG "hfs: backup: %u,%u,%u,%u\n", HFSPLUS_SB(sb).blockoffset, |
| HFSPLUS_SB(sb).sect_count, block, offset); |
| bh = sb_bread(sb, block); |
| if (bh) { |
| vhdr = (struct hfsplus_vh *)(bh->b_data + offset); |
| if (be16_to_cpu(vhdr->signature) == HFSPLUS_VOLHEAD_SIG) { |
| memcpy(vhdr, HFSPLUS_SB(sb).s_vhdr, sizeof(*vhdr)); |
| mark_buffer_dirty(bh); |
| brelse(bh); |
| } else |
| printk(KERN_WARNING "hfs: backup not found!\n"); |
| } |
| } |
| HFSPLUS_SB(sb).flags &= ~HFSPLUS_SB_WRITEBACKUP; |
| } |
| } |
| |
| static void hfsplus_put_super(struct super_block *sb) |
| { |
| dprint(DBG_SUPER, "hfsplus_put_super\n"); |
| if (!sb->s_fs_info) |
| return; |
| if (!(sb->s_flags & MS_RDONLY) && HFSPLUS_SB(sb).s_vhdr) { |
| struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr; |
| |
| vhdr->modify_date = hfsp_now2mt(); |
| vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_UNMNT); |
| vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_INCNSTNT); |
| mark_buffer_dirty(HFSPLUS_SB(sb).s_vhbh); |
| sync_dirty_buffer(HFSPLUS_SB(sb).s_vhbh); |
| } |
| |
| hfs_btree_close(HFSPLUS_SB(sb).cat_tree); |
| hfs_btree_close(HFSPLUS_SB(sb).ext_tree); |
| iput(HFSPLUS_SB(sb).alloc_file); |
| iput(HFSPLUS_SB(sb).hidden_dir); |
| brelse(HFSPLUS_SB(sb).s_vhbh); |
| if (HFSPLUS_SB(sb).nls) |
| unload_nls(HFSPLUS_SB(sb).nls); |
| kfree(sb->s_fs_info); |
| sb->s_fs_info = NULL; |
| } |
| |
| static int hfsplus_statfs(struct super_block *sb, struct kstatfs *buf) |
| { |
| buf->f_type = HFSPLUS_SUPER_MAGIC; |
| buf->f_bsize = sb->s_blocksize; |
| buf->f_blocks = HFSPLUS_SB(sb).total_blocks << HFSPLUS_SB(sb).fs_shift; |
| buf->f_bfree = HFSPLUS_SB(sb).free_blocks << HFSPLUS_SB(sb).fs_shift; |
| buf->f_bavail = buf->f_bfree; |
| buf->f_files = 0xFFFFFFFF; |
| buf->f_ffree = 0xFFFFFFFF - HFSPLUS_SB(sb).next_cnid; |
| 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; |
| struct hfsplus_sb_info sbi; |
| |
| memset(&sbi, 0, sizeof(struct hfsplus_sb_info)); |
| sbi.nls = HFSPLUS_SB(sb).nls; |
| if (!hfsplus_parse_options(data, &sbi)) |
| 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 (sbi.flags & HFSPLUS_SB_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 struct super_operations hfsplus_sops = { |
| .alloc_inode = hfsplus_alloc_inode, |
| .destroy_inode = hfsplus_destroy_inode, |
| .read_inode = hfsplus_read_inode, |
| .write_inode = hfsplus_write_inode, |
| .clear_inode = hfsplus_clear_inode, |
| .put_super = hfsplus_put_super, |
| .write_super = hfsplus_write_super, |
| .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; |
| struct qstr str; |
| struct nls_table *nls = NULL; |
| int err = -EINVAL; |
| |
| sbi = kmalloc(sizeof(struct hfsplus_sb_info), GFP_KERNEL); |
| if (!sbi) |
| return -ENOMEM; |
| |
| memset(sbi, 0, sizeof(HFSPLUS_SB(sb))); |
| sb->s_fs_info = sbi; |
| INIT_HLIST_HEAD(&sbi->rsrc_inodes); |
| hfsplus_fill_defaults(sbi); |
| if (!hfsplus_parse_options(data, sbi)) { |
| printk(KERN_ERR "hfs: unable to parse mount options\n"); |
| err = -EINVAL; |
| goto cleanup; |
| } |
| |
| /* 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"); |
| err = -EINVAL; |
| goto cleanup; |
| } |
| |
| /* Grab the volume header */ |
| if (hfsplus_read_wrapper(sb)) { |
| if (!silent) |
| printk(KERN_WARNING "hfs: unable to find HFS+ superblock\n"); |
| err = -EINVAL; |
| goto cleanup; |
| } |
| vhdr = HFSPLUS_SB(sb).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 cleanup; |
| } |
| HFSPLUS_SB(sb).total_blocks = be32_to_cpu(vhdr->total_blocks); |
| HFSPLUS_SB(sb).free_blocks = be32_to_cpu(vhdr->free_blocks); |
| HFSPLUS_SB(sb).next_alloc = be32_to_cpu(vhdr->next_alloc); |
| HFSPLUS_SB(sb).next_cnid = be32_to_cpu(vhdr->next_cnid); |
| HFSPLUS_SB(sb).file_count = be32_to_cpu(vhdr->file_count); |
| HFSPLUS_SB(sb).folder_count = be32_to_cpu(vhdr->folder_count); |
| HFSPLUS_SB(sb).data_clump_blocks = be32_to_cpu(vhdr->data_clump_sz) >> HFSPLUS_SB(sb).alloc_blksz_shift; |
| if (!HFSPLUS_SB(sb).data_clump_blocks) |
| HFSPLUS_SB(sb).data_clump_blocks = 1; |
| HFSPLUS_SB(sb).rsrc_clump_blocks = be32_to_cpu(vhdr->rsrc_clump_sz) >> HFSPLUS_SB(sb).alloc_blksz_shift; |
| if (!HFSPLUS_SB(sb).rsrc_clump_blocks) |
| HFSPLUS_SB(sb).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 (sbi->flags & HFSPLUS_SB_FORCE) { |
| /* 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)) { |
| printk(KERN_WARNING "hfs: write access to a jounaled filesystem is not supported, " |
| "use the force option at your own risk, mounting read-only.\n"); |
| sb->s_flags |= MS_RDONLY; |
| } |
| sbi->flags &= ~HFSPLUS_SB_FORCE; |
| |
| /* Load metadata objects (B*Trees) */ |
| HFSPLUS_SB(sb).ext_tree = hfs_btree_open(sb, HFSPLUS_EXT_CNID); |
| if (!HFSPLUS_SB(sb).ext_tree) { |
| printk(KERN_ERR "hfs: failed to load extents file\n"); |
| goto cleanup; |
| } |
| HFSPLUS_SB(sb).cat_tree = hfs_btree_open(sb, HFSPLUS_CAT_CNID); |
| if (!HFSPLUS_SB(sb).cat_tree) { |
| printk(KERN_ERR "hfs: failed to load catalog file\n"); |
| goto cleanup; |
| } |
| |
| HFSPLUS_SB(sb).alloc_file = iget(sb, HFSPLUS_ALLOC_CNID); |
| if (!HFSPLUS_SB(sb).alloc_file) { |
| printk(KERN_ERR "hfs: failed to load allocation file\n"); |
| goto cleanup; |
| } |
| |
| /* Load the root directory */ |
| root = iget(sb, HFSPLUS_ROOT_CNID); |
| sb->s_root = d_alloc_root(root); |
| if (!sb->s_root) { |
| printk(KERN_ERR "hfs: failed to load root directory\n"); |
| iput(root); |
| goto cleanup; |
| } |
| |
| str.len = sizeof(HFSP_HIDDENDIR_NAME) - 1; |
| str.name = HFSP_HIDDENDIR_NAME; |
| hfs_find_init(HFSPLUS_SB(sb).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 cleanup; |
| HFSPLUS_SB(sb).hidden_dir = iget(sb, be32_to_cpu(entry.folder.id)); |
| if (!HFSPLUS_SB(sb).hidden_dir) |
| goto cleanup; |
| } else |
| hfs_find_exit(&fd); |
| |
| if (sb->s_flags & MS_RDONLY) |
| goto out; |
| |
| /* 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(); |
| vhdr->write_count = cpu_to_be32(be32_to_cpu(vhdr->write_count) + 1); |
| vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_UNMNT); |
| vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_INCNSTNT); |
| mark_buffer_dirty(HFSPLUS_SB(sb).s_vhbh); |
| sync_dirty_buffer(HFSPLUS_SB(sb).s_vhbh); |
| |
| if (!HFSPLUS_SB(sb).hidden_dir) { |
| printk(KERN_DEBUG "hfs: create hidden dir...\n"); |
| HFSPLUS_SB(sb).hidden_dir = hfsplus_new_inode(sb, S_IFDIR); |
| hfsplus_create_cat(HFSPLUS_SB(sb).hidden_dir->i_ino, sb->s_root->d_inode, |
| &str, HFSPLUS_SB(sb).hidden_dir); |
| mark_inode_dirty(HFSPLUS_SB(sb).hidden_dir); |
| } |
| out: |
| unload_nls(sbi->nls); |
| sbi->nls = nls; |
| return 0; |
| |
| cleanup: |
| hfsplus_put_super(sb); |
| if (nls) |
| unload_nls(nls); |
| return err; |
| } |
| |
| MODULE_AUTHOR("Brad Boyer"); |
| MODULE_DESCRIPTION("Extended Macintosh Filesystem"); |
| MODULE_LICENSE("GPL"); |
| |
| static kmem_cache_t *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, SLAB_KERNEL); |
| return i ? &i->vfs_inode : NULL; |
| } |
| |
| static void hfsplus_destroy_inode(struct inode *inode) |
| { |
| kmem_cache_free(hfsplus_inode_cachep, &HFSPLUS_I(inode)); |
| } |
| |
| #define HFSPLUS_INODE_SIZE sizeof(struct hfsplus_inode_info) |
| |
| static int hfsplus_get_sb(struct file_system_type *fs_type, |
| int flags, const char *dev_name, void *data, |
| struct vfsmount *mnt) |
| { |
| return get_sb_bdev(fs_type, flags, dev_name, data, hfsplus_fill_super, |
| mnt); |
| } |
| |
| static struct file_system_type hfsplus_fs_type = { |
| .owner = THIS_MODULE, |
| .name = "hfsplus", |
| .get_sb = hfsplus_get_sb, |
| .kill_sb = kill_block_super, |
| .fs_flags = FS_REQUIRES_DEV, |
| }; |
| |
| static void hfsplus_init_once(void *p, kmem_cache_t *cachep, unsigned long flags) |
| { |
| struct hfsplus_inode_info *i = p; |
| |
| if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == SLAB_CTOR_CONSTRUCTOR) |
| 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, NULL); |
| 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); |
| if (kmem_cache_destroy(hfsplus_inode_cachep)) |
| printk(KERN_ERR "hfsplus_inode_cache: not all structures were freed\n"); |
| } |
| |
| module_init(init_hfsplus_fs) |
| module_exit(exit_hfsplus_fs) |