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fs: make block fiemap mapping length at least blocksize long

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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 <[email protected]>
Cc: Steven Whitehouse <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Cc: Al Viro <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Josef Bacik 2011-02-01 15:52:47 -08:00 • committed by Linus Torvalds
commit d54cdc8ca7
1 changed files with 7 additions and 0 deletions
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7
fs/ioctl.c
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@ -273,6 +273,13 @@ int __generic_block_fiemap(struct inode *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);