From: Omar Sandoval <osandov@fb.com>
Subject: Btrfs: fix blk_status_t/errno confusion
Git-commit: 58efbc9f5463308c43d812fd0748a4dee44c8a16
Patch-mainline: v4.13-rc7
References: bsc#1086457
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: 4e4cbee93d56 ("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>
Acked-by: Jeff Mahoney <jeffm@suse.com>
---
fs/btrfs/disk-io.c | 6 ++--
fs/btrfs/inode.c | 70 ++++++++++++++++++++++++++++-------------------------
fs/btrfs/raid56.c | 34 ++++++++++++-------------
fs/btrfs/volumes.c | 10 +++----
fs/btrfs/volumes.h | 4 +--
5 files changed, 64 insertions(+), 60 deletions(-)
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -3500,15 +3500,15 @@ static blk_status_t write_dev_flush(stru
{
struct request_queue *q = bdev_get_queue(device->bdev);
struct bio *bio;
- blk_status_t ret = 0;
+ blk_status_t ret = BLK_STS_OK;
if (!test_bit(QUEUE_FLAG_WC, &q->queue_flags))
- return 0;
+ return BLK_STS_OK;
if (wait) {
bio = device->flush_bio;
if (!bio)
- return 0;
+ return BLK_STS_OK;
wait_for_completion(&device->flush_wait);
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -7915,11 +7915,12 @@ 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);
@@ -7971,10 +7972,10 @@ static int btrfs_check_dio_repairable(st
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 bio *bio;
@@ -7982,18 +7983,19 @@ static int dio_read_error(struct inode *
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(BTRFS_I(inode), failrec);
- return -EIO;
+ return BLK_STS_IOERR;
}
segs = bio_segments(failed_bio);
@@ -8007,7 +8009,7 @@ static int dio_read_error(struct inode *
pgoff, isector, repair_endio, repair_arg);
if (!bio) {
free_io_failure(BTRFS_I(inode), failrec);
- return -EIO;
+ return BLK_STS_IOERR;
}
bio_set_op_attrs(bio, REQ_OP_READ, read_mode);
@@ -8015,13 +8017,13 @@ static int dio_read_error(struct inode *
"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(BTRFS_I(inode), failrec);
bio_put(bio);
}
- return ret;
+ return status;
}
struct btrfs_retry_complete {
@@ -8052,8 +8054,8 @@ 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;
@@ -8063,7 +8065,7 @@ static int __btrfs_correct_data_nocsum(s
unsigned int pgoff;
u32 sectorsize;
int nr_sectors;
- int ret;
+ blk_status_t ret;
fs_info = BTRFS_I(inode)->root->fs_info;
sectorsize = fs_info->sectorsize;
@@ -8156,11 +8158,12 @@ static blk_status_t __btrfs_subio_endio_
unsigned int pgoff;
int csum_pos;
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;
@@ -8181,12 +8184,12 @@ 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;
}
@@ -8222,7 +8225,7 @@ static blk_status_t btrfs_subio_endio_re
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);
}
@@ -8391,9 +8394,9 @@ static inline blk_status_t btrfs_lookup_
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;
@@ -8457,6 +8460,7 @@ static int btrfs_submit_direct_hook(stru
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;
@@ -8506,9 +8510,9 @@ static int btrfs_submit_direct_hook(stru
*/
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;
@@ -8526,9 +8530,9 @@ static int btrfs_submit_direct_hook(stru
} 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);
--- a/fs/btrfs/raid56.c
+++ b/fs/btrfs/raid56.c
@@ -908,7 +908,7 @@ static void raid_write_end_io(struct bio
if (!atomic_dec_and_test(&rbio->stripes_pending))
return;
- err = 0;
+ err = BLK_STS_OK;
/* OK, we have read all the stripes we need to. */
max_errors = (rbio->operation == BTRFS_RBIO_PARITY_SCRUB) ?
@@ -1323,7 +1323,7 @@ write_data:
return;
cleanup:
- rbio_orig_end_io(rbio, -EIO);
+ rbio_orig_end_io(rbio, BLK_STS_IOERR);
}
/*
@@ -1471,7 +1471,7 @@ static void raid_rmw_end_io(struct bio *
cleanup:
- rbio_orig_end_io(rbio, -EIO);
+ rbio_orig_end_io(rbio, BLK_STS_IOERR);
}
static void async_rmw_stripe(struct btrfs_raid_bio *rbio)
@@ -1575,7 +1575,7 @@ static int raid56_rmw_stripe(struct btrf
return 0;
cleanup:
- rbio_orig_end_io(rbio, -EIO);
+ rbio_orig_end_io(rbio, BLK_STS_IOERR);
return -EIO;
finish:
@@ -1791,12 +1791,12 @@ static void __raid_recover_end_io(struct
void **pointers;
int faila = -1, failb = -1;
struct page *page;
- int err;
+ blk_status_t err;
int i;
pointers = kcalloc(rbio->real_stripes, sizeof(void *), GFP_NOFS);
if (!pointers) {
- err = -ENOMEM;
+ err = BLK_STS_RESOURCE;
goto cleanup_io;
}
@@ -1852,7 +1852,7 @@ static void __raid_recover_end_io(struct
* a bad data or Q stripe.
* TODO, we should redo the xor here.
*/
- err = -EIO;
+ err = BLK_STS_IOERR;
goto cleanup;
}
/*
@@ -1878,7 +1878,7 @@ static void __raid_recover_end_io(struct
if (rbio->bbio->raid_map[failb] == RAID6_Q_STRIPE) {
if (rbio->bbio->raid_map[faila] ==
RAID5_P_STRIPE) {
- err = -EIO;
+ err = BLK_STS_IOERR;
goto cleanup;
}
/*
@@ -1950,13 +1950,13 @@ pstripe:
}
}
- err = 0;
+ err = BLK_STS_OK;
cleanup:
kfree(pointers);
cleanup_io:
if (rbio->operation == BTRFS_RBIO_READ_REBUILD) {
- if (err == 0)
+ if (err == BLK_STS_OK)
cache_rbio_pages(rbio);
else
clear_bit(RBIO_CACHE_READY_BIT, &rbio->flags);
@@ -1964,7 +1964,7 @@ cleanup_io:
rbio_orig_end_io(rbio, err);
} else if (rbio->operation == BTRFS_RBIO_REBUILD_MISSING) {
rbio_orig_end_io(rbio, err);
- } else if (err == 0) {
+ } else if (err == BLK_STS_OK) {
rbio->faila = -1;
rbio->failb = -1;
@@ -2001,7 +2001,7 @@ static void raid_recover_end_io(struct b
return;
if (atomic_read(&rbio->error) > rbio->bbio->max_errors)
- rbio_orig_end_io(rbio, -EIO);
+ rbio_orig_end_io(rbio, BLK_STS_IOERR);
else
__raid_recover_end_io(rbio);
}
@@ -2100,7 +2100,7 @@ out:
cleanup:
if (rbio->operation == BTRFS_RBIO_READ_REBUILD ||
rbio->operation == BTRFS_RBIO_REBUILD_MISSING)
- rbio_orig_end_io(rbio, -EIO);
+ rbio_orig_end_io(rbio, BLK_STS_IOERR);
return -EIO;
}
@@ -2427,7 +2427,7 @@ submit_write:
nr_data = bio_list_size(&bio_list);
if (!nr_data) {
/* Every parity is right */
- rbio_orig_end_io(rbio, 0);
+ rbio_orig_end_io(rbio, BLK_STS_OK);
return;
}
@@ -2447,7 +2447,7 @@ submit_write:
return;
cleanup:
- rbio_orig_end_io(rbio, -EIO);
+ rbio_orig_end_io(rbio, BLK_STS_IOERR);
}
static inline int is_data_stripe(struct btrfs_raid_bio *rbio, int stripe)
@@ -2515,7 +2515,7 @@ static void validate_rbio_for_parity_scr
return;
cleanup:
- rbio_orig_end_io(rbio, -EIO);
+ rbio_orig_end_io(rbio, BLK_STS_IOERR);
}
/*
@@ -2629,7 +2629,7 @@ static void raid56_parity_scrub_stripe(s
return;
cleanup:
- rbio_orig_end_io(rbio, -EIO);
+ rbio_orig_end_io(rbio, BLK_STS_IOERR);
return;
finish:
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -6205,8 +6205,8 @@ static void bbio_error(struct btrfs_bio
}
}
-int btrfs_map_bio(struct btrfs_fs_info *fs_info, struct bio *bio,
- int mirror_num, int async_submit)
+blk_status_t btrfs_map_bio(struct btrfs_fs_info *fs_info, struct bio *bio,
+ int mirror_num, int async_submit)
{
struct btrfs_device *dev;
struct bio *first_bio = bio;
@@ -6226,7 +6226,7 @@ int btrfs_map_bio(struct btrfs_fs_info *
&map_length, &bbio, mirror_num, 1);
if (ret) {
btrfs_bio_counter_dec(fs_info);
- return ret;
+ return errno_to_blk_status(ret);
}
total_devs = bbio->num_stripes;
@@ -6249,7 +6249,7 @@ int btrfs_map_bio(struct btrfs_fs_info *
}
btrfs_bio_counter_dec(fs_info);
- return ret;
+ return errno_to_blk_status(ret);
}
if (map_length < length) {
@@ -6277,7 +6277,7 @@ int btrfs_map_bio(struct btrfs_fs_info *
dev_nr, async_submit);
}
btrfs_bio_counter_dec(fs_info);
- return 0;
+ return BLK_STS_OK;
}
struct btrfs_device *btrfs_find_device(struct btrfs_fs_info *fs_info, u64 devid,
--- a/fs/btrfs/volumes.h
+++ b/fs/btrfs/volumes.h
@@ -410,8 +410,8 @@ int btrfs_alloc_chunk(struct btrfs_trans
struct btrfs_fs_info *fs_info, u64 type);
void btrfs_mapping_init(struct btrfs_mapping_tree *tree);
void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree);
-int btrfs_map_bio(struct btrfs_fs_info *fs_info, struct bio *bio,
- int mirror_num, int async_submit);
+blk_status_t btrfs_map_bio(struct btrfs_fs_info *fs_info, struct bio *bio,
+ int mirror_num, int async_submit);
int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
fmode_t flags, void *holder);
int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder,