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ext4: prevent sleeping allocation in NOWAIT write path

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Block allocation requires journal access which may sleep, violating
NOWAIT semantics. Return -EAGAIN early when IOMAP_NOWAIT is set,
allowing the caller to retry without the NOWAIT constraint.

This ensures that write paths using IOMAP_NOWAIT (e.g., DIO with
RWF_NOWAIT) will not block on journal operations when blocks need
to be allocated.

Reported-by: Sashiko <sashiko-bot@kernel.org>
Closes: https://sashiko.dev/#/patchset/20260611163441.2431805-1-libaokun@linux.alibaba.com?part=1
Reviewed-by: Zhang Yi <yi.zhang@huawei.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Baokun Li <libaokun@linux.alibaba.com>
Link: https://patch.msgid.link/20260629113827.4074335-2-libaokun@linux.alibaba.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Baokun Li 2026-06-29 19:38:22 +08:00 committed by Theodore Ts'o
parent 91949729be
commit 07d62890ef
1 changed files with 3 additions and 0 deletions
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3
fs/ext4/inode.c
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@ -3687,6 +3687,9 @@ static int ext4_iomap_alloc(struct inode *inode, struct ext4_map_blocks *map,
int ret, dio_credits, m_flags = 0, retries = 0;
bool force_commit = false;
if (flags & IOMAP_NOWAIT)
return -EAGAIN;
/*
* Trim the mapping request to the maximum value that we can map at
* once for direct I/O.