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ext4: don't block for O_DIRECT if IOCB_NOWAIT is set

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Running with some debug patches to detect illegal blocking triggered the
extend/unaligned condition in ext4. If ext4 needs to extend the file (and
hence go to buffered IO), or if the app is doing unaligned IO, then ext4
asks the iomap code to wait for IO completion. If the caller asked for
no-wait semantics by setting IOCB_NOWAIT, then ext4 should return -EAGAIN
instead.

Signed-off-by: Jens Axboe <axboe@kernel.dk>

Link: https://lore.kernel.org/r/76152096-2bbb-7682-8fce-4cb498bcd909@kernel.dk
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Jens Axboe 2020-05-24 16:53:16 -06:00 committed by Theodore Ts'o
parent ba98890393
commit 6e014c621e
1 changed files with 6 additions and 0 deletions
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6
fs/ext4/file.c
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@ -502,6 +502,12 @@ static ssize_t ext4_dio_write_iter(struct kiocb *iocb, struct iov_iter *from)
if (ret <= 0)
return ret;
/* if we're going to block and IOCB_NOWAIT is set, return -EAGAIN */
if ((iocb->ki_flags & IOCB_NOWAIT) && (unaligned_io || extend)) {
ret = -EAGAIN;
goto out;
}
offset = iocb->ki_pos;
count = ret;