diff options
Diffstat (limited to 'fs/hfsplus/super.c')
| -rw-r--r-- | fs/hfsplus/super.c | 502 |
1 files changed, 502 insertions, 0 deletions
diff --git a/fs/hfsplus/super.c b/fs/hfsplus/super.c new file mode 100644 index 0000000..5f80446 --- /dev/null +++ b/fs/hfsplus/super.c @@ -0,0 +1,502 @@ +/* + * 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/version.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" + +void hfsplus_inode_check(struct super_block *sb) +{ +#if 0 + u32 cnt = atomic_read(&HFSPLUS_SB(sb).inode_cnt); + u32 last_cnt = HFSPLUS_SB(sb).last_inode_cnt; + + if (cnt <= (last_cnt / 2) || + cnt >= (last_cnt * 2)) { + HFSPLUS_SB(sb).last_inode_cnt = cnt; + printk("inode_check: %u,%u,%u\n", cnt, last_cnt, + HFSPLUS_SB(sb).cat_tree ? HFSPLUS_SB(sb).cat_tree->node_hash_cnt : 0); + } +#endif +} + +static void hfsplus_read_inode(struct inode *inode) +{ + struct hfs_find_data fd; + struct hfsplus_vh *vhdr; + int err; + + atomic_inc(&HFSPLUS_SB(inode->i_sb).inode_cnt); + hfsplus_inode_check(inode->i_sb); + 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; + + 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); + atomic_dec(&HFSPLUS_SB(inode->i_sb).inode_cnt); + if (HFSPLUS_IS_RSRC(inode)) { + HFSPLUS_I(HFSPLUS_I(inode).rsrc_inode).rsrc_inode = NULL; + iput(HFSPLUS_I(inode).rsrc_inode); + } + hfsplus_inode_check(inode->i_sb); +} + +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("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("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_flags & MS_RDONLY)) { + 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); + ll_rw_block(WRITE, 1, &HFSPLUS_SB(sb).s_vhbh); + wait_on_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); +} + +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; + + if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) { + printk("HFS+-fs warning: Filesystem was not cleanly unmounted, " + "running fsck.hfsplus is recommended. leaving read-only.\n"); + sb->s_flags |= MS_RDONLY; + *flags |= MS_RDONLY; + } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) { + printk("HFS+-fs: Filesystem is marked locked, 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, +}; + +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); + fill_defaults(sbi); + if (!parse_options(data, sbi)) { + if (!silent) + printk("HFS+-fs: 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 (!nls) { + printk("HFS+: unable to load nls for utf8\n"); + err = -EINVAL; + goto cleanup; + } + + /* Grab the volume header */ + if (hfsplus_read_wrapper(sb)) { + if (!silent) + printk("HFS+-fs: 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 = be16_to_cpu(vhdr->signature); + if (be16_to_cpu(vhdr->version) != HFSPLUS_CURRENT_VERSION) { + if (!silent) + printk("HFS+-fs: 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))) { + if (!silent) + printk("HFS+-fs warning: Filesystem was not cleanly unmounted, " + "running fsck.hfsplus is recommended. mounting read-only.\n"); + sb->s_flags |= MS_RDONLY; + } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) { + if (!silent) + printk("HFS+-fs: Filesystem is marked locked, mounting read-only.\n"); + sb->s_flags |= MS_RDONLY; + } + + /* Load metadata objects (B*Trees) */ + HFSPLUS_SB(sb).ext_tree = hfs_btree_open(sb, HFSPLUS_EXT_CNID); + if (!HFSPLUS_SB(sb).ext_tree) { + if (!silent) + printk("HFS+-fs: 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) { + if (!silent) + printk("HFS+-fs: failed to load catalog file\n"); + goto cleanup; + } + + HFSPLUS_SB(sb).alloc_file = iget(sb, HFSPLUS_ALLOC_CNID); + if (!HFSPLUS_SB(sb).alloc_file) { + if (!silent) + printk("HFS+-fs: 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) { + if (!silent) + printk("HFS+-fs: 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); + ll_rw_block(WRITE, 1, &HFSPLUS_SB(sb).s_vhbh); + wait_on_buffer(HFSPLUS_SB(sb).s_vhbh); + + if (!HFSPLUS_SB(sb).hidden_dir) { + printk("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 struct super_block *hfsplus_get_sb(struct file_system_type *fs_type, + int flags, const char *dev_name, void *data) +{ + return get_sb_bdev(fs_type, flags, dev_name, data, hfsplus_fill_super); +} + +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_INFO "hfsplus_inode_cache: not all structures were freed\n"); +} + +module_init(init_hfsplus_fs) +module_exit(exit_hfsplus_fs) |
