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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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34
fs/btrfs/raid56.c
View File

@@ -905,7 +905,7 @@ static void raid_write_end_io(struct bio *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) ?
@@ -1324,7 +1324,7 @@ write_data:
return;
cleanup:
rbio_orig_end_io(rbio, -EIO);
rbio_orig_end_io(rbio, BLK_STS_IOERR);
}
/*
@@ -1475,7 +1475,7 @@ static void raid_rmw_end_io(struct bio *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)
@@ -1579,7 +1579,7 @@ static int raid56_rmw_stripe(struct btrfs_raid_bio *rbio)
return 0;
cleanup:
rbio_orig_end_io(rbio, -EIO);
rbio_orig_end_io(rbio, BLK_STS_IOERR);
return -EIO;
finish:
@@ -1795,12 +1795,12 @@ static void __raid_recover_end_io(struct btrfs_raid_bio *rbio)
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;
}
@@ -1856,7 +1856,7 @@ static void __raid_recover_end_io(struct btrfs_raid_bio *rbio)
* a bad data or Q stripe.
* TODO, we should redo the xor here.
*/
err = -EIO;
err = BLK_STS_IOERR;
goto cleanup;
}
/*
@@ -1882,7 +1882,7 @@ static void __raid_recover_end_io(struct btrfs_raid_bio *rbio)
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;
}
/*
@@ -1954,13 +1954,13 @@ 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);
@@ -1968,7 +1968,7 @@ 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;
@@ -2005,7 +2005,7 @@ static void raid_recover_end_io(struct bio *bio)
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);
}
@@ -2104,7 +2104,7 @@ 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;
}
@@ -2431,7 +2431,7 @@ 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;
}
@@ -2451,7 +2451,7 @@ 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)
@@ -2519,7 +2519,7 @@ static void validate_rbio_for_parity_scrub(struct btrfs_raid_bio *rbio)
return;
cleanup:
rbio_orig_end_io(rbio, -EIO);
rbio_orig_end_io(rbio, BLK_STS_IOERR);
}
/*
@@ -2633,7 +2633,7 @@ static void raid56_parity_scrub_stripe(struct btrfs_raid_bio *rbio)
return;
cleanup:
rbio_orig_end_io(rbio, -EIO);
rbio_orig_end_io(rbio, BLK_STS_IOERR);
return;
finish: