* [PATCH v7 1/5] libfs: Return ENOSPC when the directory offset range is exhausted
[not found] <20241228175522.1854234-1-cel@kernel.org>
@ 2024-12-28 17:55 ` cel
0 siblings, 0 replies; only message in thread
From: cel @ 2024-12-28 17:55 UTC (permalink / raw)
To: Hugh Dickins, Christian Brauner, Al Viro
Cc: linux-fsdevel, linux-mm, yukuai3, yangerkun, Liam.Howlett,
Chuck Lever, stable, Jeff Layton, Yang Erkun
From: Chuck Lever <chuck.lever@oracle.com>
Testing shows that the EBUSY error return from mtree_alloc_cyclic()
leaks into user space. The ERRORS section of "man creat(2)" says:
> EBUSY O_EXCL was specified in flags and pathname refers
> to a block device that is in use by the system
> (e.g., it is mounted).
ENOSPC is closer to what applications expect in this situation.
Note that the normal range of simple directory offset values is
2..2^63, so hitting this error is going to be rare to impossible.
Fixes: 6faddda69f62 ("libfs: Add directory operations for stable offsets")
Cc: <stable@vger.kernel.org> # v6.9+
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: Yang Erkun <yangerkun@huawei.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
---
fs/libfs.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/fs/libfs.c b/fs/libfs.c
index 748ac5923154..3da58a92f48f 100644
--- a/fs/libfs.c
+++ b/fs/libfs.c
@@ -292,8 +292,8 @@ int simple_offset_add(struct offset_ctx *octx, struct dentry *dentry)
ret = mtree_alloc_cyclic(&octx->mt, &offset, dentry, DIR_OFFSET_MIN,
LONG_MAX, &octx->next_offset, GFP_KERNEL);
- if (ret < 0)
- return ret;
+ if (unlikely(ret < 0))
+ return ret == -EBUSY ? -ENOSPC : ret;
offset_set(dentry, offset);
return 0;
--
2.47.0
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