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hfsplus: use raw bio access for the volume headers
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The hfsplus backup volume header is located two blocks from the end of
the device.  In case of device sizes that are not 4k aligned this means
we can't access it using buffer_heads when using the default 4k block
size.

Switch to using raw bios to read/write all buffer headers.  We were not
relying on any caching behaviour of the buffer heads anyway.  Additionally
always read in the backup volume header during mount to verify that we
can actually read it.

Signed-off-by: Christoph Hellwig <hch@tuxera.com>
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Christoph Hellwig authored and Christoph Hellwig committed Nov 23, 2010
1 parent 3b5ce8a commit 52399b1
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Showing 3 changed files with 131 additions and 88 deletions.
8 changes: 5 additions & 3 deletions fs/hfsplus/hfsplus_fs.h
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Original file line number Diff line number Diff line change
Expand Up @@ -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;
Expand All @@ -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 */
Expand Down Expand Up @@ -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)
Expand Down
48 changes: 22 additions & 26 deletions fs/hfsplus/super.c
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Original file line number Diff line number Diff line change
Expand Up @@ -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)
Expand Down Expand Up @@ -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;
Expand Down
163 changes: 104 additions & 59 deletions fs/hfsplus/wrapper.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -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;
Expand Down Expand Up @@ -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;
}

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