The patch titled
fs: make block fiemap mapping length at least blocksize long
has been added to the -mm tree. Its filename is
fs-make-block-fiemap-mapping-length-at-least-blocksize-long.patch
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------------------------------------------------------
Subject: fs: make block fiemap mapping length at least blocksize long
From: Josef Bacik <josef@xxxxxxxxxx>
Some filesystems don't deal well with being asked to map less than
blocksize blocks (GFS2 for example). Since we are always mapping at least
blocksize sections anyway, just make sure len is at least as big as a
blocksize so we don't trip up any filesystems. Thanks,
Signed-off-by: Josef Bacik <josef@xxxxxxxxxx>
Cc: Steven Whitehouse <swhiteho@xxxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxx>
Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/ioctl.c | 7 +++++++
1 file changed, 7 insertions(+)
diff -puN fs/ioctl.c~fs-make-block-fiemap-mapping-length-at-least-blocksize-long fs/ioctl.c
--- a/fs/ioctl.c~fs-make-block-fiemap-mapping-length-at-least-blocksize-long
+++ a/fs/ioctl.c
@@ -273,6 +273,13 @@ int __generic_block_fiemap(struct inode
len = isize;
}
+ /*
+ * Some filesystems can't deal with being asked to map less than
+ * blocksize, so make sure our len is at least block length.
+ */
+ if (logical_to_blk(inode, len) == 0)
+ len = blk_to_logical(inode, 1);
+
start_blk = logical_to_blk(inode, start);
last_blk = logical_to_blk(inode, start + len - 1);
_
Patches currently in -mm which might be from josef@xxxxxxxxxx are
fs-make-block-fiemap-mapping-length-at-least-blocksize-long.patch
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