This is a note to let you know that I've just added the patch titled
iomap: remove the length variable in iomap_seek_data
to the 5.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
iomap-remove-the-length-variable-in-iomap_seek_data.patch
and it can be found in the queue-5.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit b883b575b4e52c533ae37a8ac6c54c19d9c0a39d
Author: Christoph Hellwig <hch@xxxxxx>
Date: Thu Jul 15 09:58:04 2021 -0700
iomap: remove the length variable in iomap_seek_data
[ Upstream commit 3ac1d426510f97ace05093ae9f2f710d9cbe6215 ]
The length variable is rather pointless given that it can be trivially
deduced from offset and size. Also the initial calculation can lead
to KASAN warnings.
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
Reported-by: Leizhen (ThunderTown) <thunder.leizhen@xxxxxxxxxx>
Reviewed-by: Darrick J. Wong <djwong@xxxxxxxxxx>
Signed-off-by: Darrick J. Wong <djwong@xxxxxxxxxx>
Reviewed-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/fs/iomap/seek.c b/fs/iomap/seek.c
index c04bad4b2b43..c61b889235b3 100644
--- a/fs/iomap/seek.c
+++ b/fs/iomap/seek.c
@@ -186,27 +186,23 @@ loff_t
iomap_seek_data(struct inode *inode, loff_t offset, const struct iomap_ops *ops)
{
loff_t size = i_size_read(inode);
- loff_t length = size - offset;
loff_t ret;
/* Nothing to be found before or beyond the end of the file. */
if (offset < 0 || offset >= size)
return -ENXIO;
- while (length > 0) {
- ret = iomap_apply(inode, offset, length, IOMAP_REPORT, ops,
- &offset, iomap_seek_data_actor);
+ while (offset < size) {
+ ret = iomap_apply(inode, offset, size - offset, IOMAP_REPORT,
+ ops, &offset, iomap_seek_data_actor);
if (ret < 0)
return ret;
if (ret == 0)
- break;
-
+ return offset;
offset += ret;
- length -= ret;
}
- if (length <= 0)
- return -ENXIO;
- return offset;
+ /* We've reached the end of the file without finding data */
+ return -ENXIO;
}
EXPORT_SYMBOL_GPL(iomap_seek_data);
