diff options
Diffstat (limited to 'fs')
-rw-r--r-- | fs/hfsplus/hfsplus_fs.h | 8 | ||||
-rw-r--r-- | fs/hfsplus/super.c | 48 | ||||
-rw-r--r-- | fs/hfsplus/wrapper.c | 163 |
3 files changed, 131 insertions, 88 deletions
diff --git a/fs/hfsplus/hfsplus_fs.h b/fs/hfsplus/hfsplus_fs.h index f07aa640c27d..276ddb0fd0fd 100644 --- a/fs/hfsplus/hfsplus_fs.h +++ b/fs/hfsplus/hfsplus_fs.h @@ -107,8 +107,8 @@ struct hfsplus_vh; struct hfs_btree; struct hfsplus_sb_info { - struct buffer_head *s_vhbh; struct hfsplus_vh *s_vhdr; + struct hfsplus_vh *s_backup_vhdr; struct hfs_btree *ext_tree; struct hfs_btree *cat_tree; struct hfs_btree *attr_tree; @@ -118,7 +118,8 @@ struct hfsplus_sb_info { /* Runtime variables */ u32 blockoffset; - u32 sect_count; + sector_t part_start; + sector_t sect_count; int fs_shift; /* immutable data from the volume header */ @@ -385,8 +386,9 @@ int hfsplus_compare_dentry(struct dentry *dentry, struct qstr *s1, struct qstr * /* wrapper.c */ int hfsplus_read_wrapper(struct super_block *); - int hfs_part_find(struct super_block *, sector_t *, sector_t *); +int hfsplus_submit_bio(struct block_device *bdev, sector_t sector, + void *data, int rw); /* access macros */ static inline struct hfsplus_sb_info *HFSPLUS_SB(struct super_block *sb) diff --git a/fs/hfsplus/super.c b/fs/hfsplus/super.c index 6a2349058618..fe8f7bffbea5 100644 --- a/fs/hfsplus/super.c +++ b/fs/hfsplus/super.c @@ -157,45 +157,40 @@ 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; dprint(DBG_SUPER, "hfsplus_write_super\n"); - mutex_lock(&sbi->vh_mutex); - mutex_lock(&sbi->alloc_mutex); sb->s_dirt = 0; + 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); - mark_buffer_dirty(sbi->s_vhbh); if (test_and_clear_bit(HFSPLUS_SB_WRITEBACKUP, &sbi->flags)) { - if (sbi->sect_count) { - struct buffer_head *bh; - u32 block, offset; - - block = sbi->blockoffset; - block += (sbi->sect_count - 2) >> (sb->s_blocksize_bits - 9); - offset = ((sbi->sect_count - 2) << 9) & (sb->s_blocksize - 1); - printk(KERN_DEBUG "hfs: backup: %u,%u,%u,%u\n", - sbi->blockoffset, sbi->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, sbi->s_vhdr, sizeof(*vhdr)); - mark_buffer_dirty(bh); - brelse(bh); - } else - printk(KERN_WARNING "hfs: backup not found!\n"); - } - } + memcpy(sbi->s_backup_vhdr, sbi->s_vhdr, sizeof(*sbi->s_vhdr)); + write_backup = 1; } + + error = hfsplus_submit_bio(sb->s_bdev, + sbi->part_start + HFSPLUS_VOLHEAD_SECTOR, + sbi->s_vhdr, WRITE_SYNC); + if (!write_backup) + goto out; + + error2 = hfsplus_submit_bio(sb->s_bdev, + sbi->part_start + sbi->sect_count - 2, + sbi->s_backup_vhdr, WRITE_SYNC); + if (!error) + error2 = error; +out: mutex_unlock(&sbi->alloc_mutex); mutex_unlock(&sbi->vh_mutex); - return 0; + return error; } static void hfsplus_write_super(struct super_block *sb) @@ -229,7 +224,8 @@ static void hfsplus_put_super(struct super_block *sb) hfs_btree_close(sbi->ext_tree); iput(sbi->alloc_file); iput(sbi->hidden_dir); - brelse(sbi->s_vhbh); + kfree(sbi->s_vhdr); + kfree(sbi->s_backup_vhdr); unload_nls(sbi->nls); kfree(sb->s_fs_info); sb->s_fs_info = NULL; diff --git a/fs/hfsplus/wrapper.c b/fs/hfsplus/wrapper.c index 8972c20b3216..15e0eabb489e 100644 --- a/fs/hfsplus/wrapper.c +++ b/fs/hfsplus/wrapper.c @@ -24,6 +24,40 @@ struct hfsplus_wd { u16 embed_count; }; +static void hfsplus_end_io_sync(struct bio *bio, int err) +{ + if (err) + clear_bit(BIO_UPTODATE, &bio->bi_flags); + complete(bio->bi_private); +} + +int hfsplus_submit_bio(struct block_device *bdev, sector_t sector, + void *data, int rw) +{ + DECLARE_COMPLETION_ONSTACK(wait); + struct bio *bio; + + bio = bio_alloc(GFP_NOIO, 1); + bio->bi_sector = sector; + bio->bi_bdev = bdev; + bio->bi_end_io = hfsplus_end_io_sync; + bio->bi_private = &wait; + + /* + * We always submit one sector at a time, so bio_add_page must not fail. + */ + if (bio_add_page(bio, virt_to_page(data), HFSPLUS_SECTOR_SIZE, + offset_in_page(data)) != HFSPLUS_SECTOR_SIZE) + BUG(); + + submit_bio(rw, bio); + wait_for_completion(&wait); + + if (!bio_flagged(bio, BIO_UPTODATE)) + return -EIO; + return 0; +} + static int hfsplus_read_mdb(void *bufptr, struct hfsplus_wd *wd) { u32 extent; @@ -88,100 +122,111 @@ static int hfsplus_get_last_session(struct super_block *sb, int hfsplus_read_wrapper(struct super_block *sb) { struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb); - struct buffer_head *bh; - struct hfsplus_vh *vhdr; struct hfsplus_wd wd; sector_t part_start, part_size; u32 blocksize; + int error = 0; + error = -EINVAL; blocksize = sb_min_blocksize(sb, HFSPLUS_SECTOR_SIZE); if (!blocksize) - return -EINVAL; + goto out; if (hfsplus_get_last_session(sb, &part_start, &part_size)) - return -EINVAL; + goto out; if ((u64)part_start + part_size > 0x100000000ULL) { pr_err("hfs: volumes larger than 2TB are not supported yet\n"); - return -EINVAL; + goto out; } - while (1) { - bh = sb_bread512(sb, part_start + HFSPLUS_VOLHEAD_SECTOR, vhdr); - if (!bh) - return -EIO; - - if (vhdr->signature == cpu_to_be16(HFSP_WRAP_MAGIC)) { - if (!hfsplus_read_mdb(vhdr, &wd)) - goto error; - wd.ablk_size >>= HFSPLUS_SECTOR_SHIFT; - part_start += wd.ablk_start + wd.embed_start * wd.ablk_size; - part_size = wd.embed_count * wd.ablk_size; - brelse(bh); - bh = sb_bread512(sb, part_start + HFSPLUS_VOLHEAD_SECTOR, vhdr); - if (!bh) - return -EIO; - } - if (vhdr->signature == cpu_to_be16(HFSPLUS_VOLHEAD_SIG)) - break; - if (vhdr->signature == cpu_to_be16(HFSPLUS_VOLHEAD_SIGX)) { - set_bit(HFSPLUS_SB_HFSX, &sbi->flags); - break; - } - brelse(bh); - /* check for a partition block + error = -ENOMEM; + sbi->s_vhdr = kmalloc(HFSPLUS_SECTOR_SIZE, GFP_KERNEL); + if (!sbi->s_vhdr) + goto out; + sbi->s_backup_vhdr = kmalloc(HFSPLUS_SECTOR_SIZE, GFP_KERNEL); + if (!sbi->s_backup_vhdr) + goto out_free_vhdr; + +reread: + error = hfsplus_submit_bio(sb->s_bdev, + part_start + HFSPLUS_VOLHEAD_SECTOR, + sbi->s_vhdr, READ); + if (error) + goto out_free_backup_vhdr; + + error = -EINVAL; + switch (sbi->s_vhdr->signature) { + case cpu_to_be16(HFSPLUS_VOLHEAD_SIGX): + set_bit(HFSPLUS_SB_HFSX, &sbi->flags); + /*FALLTHRU*/ + case cpu_to_be16(HFSPLUS_VOLHEAD_SIG): + break; + case cpu_to_be16(HFSP_WRAP_MAGIC): + if (!hfsplus_read_mdb(sbi->s_vhdr, &wd)) + goto out; + wd.ablk_size >>= HFSPLUS_SECTOR_SHIFT; + part_start += wd.ablk_start + wd.embed_start * wd.ablk_size; + part_size = wd.embed_count * wd.ablk_size; + goto reread; + default: + /* + * Check for a partition block. + * * (should do this only for cdrom/loop though) */ if (hfs_part_find(sb, &part_start, &part_size)) - return -EINVAL; + goto out; + goto reread; + } + + error = hfsplus_submit_bio(sb->s_bdev, + part_start + part_size - 2, + sbi->s_backup_vhdr, READ); + if (error) + goto out_free_backup_vhdr; + + error = -EINVAL; + if (sbi->s_backup_vhdr->signature != sbi->s_vhdr->signature) { + printk(KERN_WARNING + "hfs: invalid secondary volume header\n"); + goto out_free_backup_vhdr; } - blocksize = be32_to_cpu(vhdr->blocksize); - brelse(bh); + blocksize = be32_to_cpu(sbi->s_vhdr->blocksize); - /* block size must be at least as large as a sector - * and a multiple of 2 + /* + * Block size must be at least as large as a sector and a multiple of 2. */ - if (blocksize < HFSPLUS_SECTOR_SIZE || - ((blocksize - 1) & blocksize)) - return -EINVAL; + if (blocksize < HFSPLUS_SECTOR_SIZE || ((blocksize - 1) & blocksize)) + goto out_free_backup_vhdr; sbi->alloc_blksz = blocksize; sbi->alloc_blksz_shift = 0; while ((blocksize >>= 1) != 0) sbi->alloc_blksz_shift++; blocksize = min(sbi->alloc_blksz, (u32)PAGE_SIZE); - /* align block size to block offset */ + /* + * Align block size to block offset. + */ while (part_start & ((blocksize >> HFSPLUS_SECTOR_SHIFT) - 1)) blocksize >>= 1; if (sb_set_blocksize(sb, blocksize) != blocksize) { printk(KERN_ERR "hfs: unable to set blocksize to %u!\n", blocksize); - return -EINVAL; + goto out_free_backup_vhdr; } sbi->blockoffset = part_start >> (sb->s_blocksize_bits - HFSPLUS_SECTOR_SHIFT); + sbi->part_start = part_start; sbi->sect_count = part_size; sbi->fs_shift = sbi->alloc_blksz_shift - sb->s_blocksize_bits; - - bh = sb_bread512(sb, part_start + HFSPLUS_VOLHEAD_SECTOR, vhdr); - if (!bh) - return -EIO; - - /* should still be the same... */ - if (test_bit(HFSPLUS_SB_HFSX, &sbi->flags)) { - if (vhdr->signature != cpu_to_be16(HFSPLUS_VOLHEAD_SIGX)) - goto error; - } else { - if (vhdr->signature != cpu_to_be16(HFSPLUS_VOLHEAD_SIG)) - goto error; - } - - sbi->s_vhbh = bh; - sbi->s_vhdr = vhdr; - return 0; - error: - brelse(bh); - return -EINVAL; + +out_free_backup_vhdr: + kfree(sbi->s_backup_vhdr); +out_free_vhdr: + kfree(sbi->s_vhdr); +out: + return error; } |