This is a note to let you know that I've just added the patch titled
gfs2: Fix length of holes reported at end-of-file
to the 5.15-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:
gfs2-fix-length-of-holes-reported-at-end-of-file.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 069583881eff6c4b4721e593fd5ec8b110eb00b6
Author: Andreas Gruenbacher <agruenba@xxxxxxxxxx>
Date: Sat Nov 6 00:18:56 2021 +0100
gfs2: Fix length of holes reported at end-of-file
[ Upstream commit f3506eee81d1f700d9ee2d2f4a88fddb669ec032 ]
Fix the length of holes reported at the end of a file: the length is
relative to the beginning of the extent, not the seek position which is
rounded down to the filesystem block size.
This bug went unnoticed for some time, but is now caught by the
following assertion in iomap_iter_done():
WARN_ON_ONCE(iter->iomap.offset + iter->iomap.length <= iter->pos)
Signed-off-by: Andreas Gruenbacher <agruenba@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/fs/gfs2/bmap.c b/fs/gfs2/bmap.c
index 5414c2c335809..fba32141a651b 100644
--- a/fs/gfs2/bmap.c
+++ b/fs/gfs2/bmap.c
@@ -940,7 +940,7 @@ static int __gfs2_iomap_get(struct inode *inode, loff_t pos, loff_t length,
else if (height == ip->i_height)
ret = gfs2_hole_size(inode, lblock, len, mp, iomap);
else
- iomap->length = size - pos;
+ iomap->length = size - iomap->offset;
} else if (flags & IOMAP_WRITE) {
u64 alloc_size;
