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bcachefs: Fix dio write path with loopback dio mode

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When the iov_iter is a bvec iter, it's possible the IO was submitted
from a kthread that didn't have an mm to switch to.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
This commit is contained in:
Kent Overstreet
2022-03-09 15:37:42 -05:00
committed by Kent Overstreet
parent 4d126dc8b3
commit 9552e19f6f
1 changed files with 2 additions and 2 deletions
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4
fs/bcachefs/fs-io.c
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@@ -2110,7 +2110,7 @@ static long bch2_dio_write_loop(struct dio_write *dio)
while (1) {
iter_count = dio->iter.count;
if (kthread)
if (kthread && dio->mm)
kthread_use_mm(dio->mm);
BUG_ON(current->faults_disabled_mapping);
current->faults_disabled_mapping = mapping;
@@ -2120,7 +2120,7 @@ static long bch2_dio_write_loop(struct dio_write *dio)
dropped_locks = fdm_dropped_locks();
current->faults_disabled_mapping = NULL;
if (kthread)
if (kthread && dio->mm)
kthread_unuse_mm(dio->mm);
/*