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Btrfs: fix blk_status_t/errno confusion

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This fixes several instances of blk_status_t and bare errno ints being
mixed up, some of which are real bugs.

In the normal case, 0 matches BLK_STS_OK, so we don't observe any
effects of the missing conversion, but in case of errors or passes
through the repair/retry paths, the errors get mixed up.

The changes were identified using 'sparse', we don't have reports of the
buggy behaviour.

Fixes: 4e4cbee93d ("block: switch bios to blk_status_t")
Signed-off-by: Omar Sandoval <osandov@fb.com>
Reviewed-by: Liu Bo <bo.li.liu@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Omar Sandoval
2017-08-22 23:45:59 -07:00
committed by David Sterba
parent 14ccee78fc
commit 58efbc9f54
5 changed files with 64 additions and 60 deletions
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70
fs/btrfs/inode.c
View File

@@ -7924,11 +7924,12 @@ err:
return ret;
}
static inline int submit_dio_repair_bio(struct inode *inode, struct bio *bio,
int mirror_num)
static inline blk_status_t submit_dio_repair_bio(struct inode *inode,
struct bio *bio,
int mirror_num)
{
struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
int ret;
blk_status_t ret;
BUG_ON(bio_op(bio) == REQ_OP_WRITE);
@@ -7980,10 +7981,10 @@ static int btrfs_check_dio_repairable(struct inode *inode,
return 1;
}
static int dio_read_error(struct inode *inode, struct bio *failed_bio,
struct page *page, unsigned int pgoff,
u64 start, u64 end, int failed_mirror,
bio_end_io_t *repair_endio, void *repair_arg)
static blk_status_t dio_read_error(struct inode *inode, struct bio *failed_bio,
struct page *page, unsigned int pgoff,
u64 start, u64 end, int failed_mirror,
bio_end_io_t *repair_endio, void *repair_arg)
{
struct io_failure_record *failrec;
struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
@@ -7993,18 +7994,19 @@ static int dio_read_error(struct inode *inode, struct bio *failed_bio,
int read_mode = 0;
int segs;
int ret;
blk_status_t status;
BUG_ON(bio_op(failed_bio) == REQ_OP_WRITE);
ret = btrfs_get_io_failure_record(inode, start, end, &failrec);
if (ret)
return ret;
return errno_to_blk_status(ret);
ret = btrfs_check_dio_repairable(inode, failed_bio, failrec,
failed_mirror);
if (!ret) {
free_io_failure(failure_tree, io_tree, failrec);
return -EIO;
return BLK_STS_IOERR;
}
segs = bio_segments(failed_bio);
@@ -8022,13 +8024,13 @@ static int dio_read_error(struct inode *inode, struct bio *failed_bio,
"Repair DIO Read Error: submitting new dio read[%#x] to this_mirror=%d, in_validation=%d\n",
read_mode, failrec->this_mirror, failrec->in_validation);
ret = submit_dio_repair_bio(inode, bio, failrec->this_mirror);
if (ret) {
status = submit_dio_repair_bio(inode, bio, failrec->this_mirror);
if (status) {
free_io_failure(failure_tree, io_tree, failrec);
bio_put(bio);
}
return ret;
return status;
}
struct btrfs_retry_complete {
@@ -8065,8 +8067,8 @@ end:
bio_put(bio);
}
static int __btrfs_correct_data_nocsum(struct inode *inode,
struct btrfs_io_bio *io_bio)
static blk_status_t __btrfs_correct_data_nocsum(struct inode *inode,
struct btrfs_io_bio *io_bio)
{
struct btrfs_fs_info *fs_info;
struct bio_vec bvec;
@@ -8076,8 +8078,8 @@ static int __btrfs_correct_data_nocsum(struct inode *inode,
unsigned int pgoff;
u32 sectorsize;
int nr_sectors;
int ret;
int err = 0;
blk_status_t ret;
blk_status_t err = BLK_STS_OK;
fs_info = BTRFS_I(inode)->root->fs_info;
sectorsize = fs_info->sectorsize;
@@ -8183,11 +8185,12 @@ static blk_status_t __btrfs_subio_endio_read(struct inode *inode,
int csum_pos;
bool uptodate = (err == 0);
int ret;
blk_status_t status;
fs_info = BTRFS_I(inode)->root->fs_info;
sectorsize = fs_info->sectorsize;
err = 0;
err = BLK_STS_OK;
start = io_bio->logical;
done.inode = inode;
io_bio->bio.bi_iter = io_bio->iter;
@@ -8209,12 +8212,12 @@ try_again:
done.start = start;
init_completion(&done.done);
ret = dio_read_error(inode, &io_bio->bio, bvec.bv_page,
pgoff, start, start + sectorsize - 1,
io_bio->mirror_num,
btrfs_retry_endio, &done);
if (ret) {
err = errno_to_blk_status(ret);
status = dio_read_error(inode, &io_bio->bio, bvec.bv_page,
pgoff, start, start + sectorsize - 1,
io_bio->mirror_num, btrfs_retry_endio,
&done);
if (status) {
err = status;
goto next;
}
@@ -8250,7 +8253,7 @@ static blk_status_t btrfs_subio_endio_read(struct inode *inode,
if (unlikely(err))
return __btrfs_correct_data_nocsum(inode, io_bio);
else
return 0;
return BLK_STS_OK;
} else {
return __btrfs_subio_endio_read(inode, io_bio, err);
}
@@ -8423,9 +8426,9 @@ static inline blk_status_t btrfs_lookup_and_bind_dio_csum(struct inode *inode,
return 0;
}
static inline int __btrfs_submit_dio_bio(struct bio *bio, struct inode *inode,
u64 file_offset, int skip_sum,
int async_submit)
static inline blk_status_t
__btrfs_submit_dio_bio(struct bio *bio, struct inode *inode, u64 file_offset,
int skip_sum, int async_submit)
{
struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
struct btrfs_dio_private *dip = bio->bi_private;
@@ -8488,6 +8491,7 @@ static int btrfs_submit_direct_hook(struct btrfs_dio_private *dip,
int clone_offset = 0;
int clone_len;
int ret;
blk_status_t status;
map_length = orig_bio->bi_iter.bi_size;
submit_len = map_length;
@@ -8537,9 +8541,9 @@ static int btrfs_submit_direct_hook(struct btrfs_dio_private *dip,
*/
atomic_inc(&dip->pending_bios);
ret = __btrfs_submit_dio_bio(bio, inode, file_offset, skip_sum,
async_submit);
if (ret) {
status = __btrfs_submit_dio_bio(bio, inode, file_offset, skip_sum,
async_submit);
if (status) {
bio_put(bio);
atomic_dec(&dip->pending_bios);
goto out_err;
@@ -8557,9 +8561,9 @@ static int btrfs_submit_direct_hook(struct btrfs_dio_private *dip,
} while (submit_len > 0);
submit:
ret = __btrfs_submit_dio_bio(bio, inode, file_offset, skip_sum,
async_submit);
if (!ret)
status = __btrfs_submit_dio_bio(bio, inode, file_offset, skip_sum,
async_submit);
if (!status)
return 0;
bio_put(bio);