tree 79015c1a36eececfe2e398ed11ab5ca742bf0ffe
parent 10f73d27c8e977fb6fbd6058517069be830c6c9a
author Jie Liu <jeff.liu@oracle.com> 1384934933 +0800
committer Ben Myers <bpm@sgi.com> 1386193372 -0600

xfs: don't perform discard if the given range length is less than block size

For discard operation, we should return EINVAL if the given range length
is less than a block size, otherwise it will go through the file system
to discard data blocks as the end range might be evaluated to -1, e.g,
# fstrim -v -o 0 -l 100 /xfs7
/xfs7: 9811378176 bytes were trimmed

This issue can be triggered via xfstests/generic/288.

Also, it seems to get the request queue pointer via bdev_get_queue()
instead of the hard code pointer dereference is not a bad thing.

Signed-off-by: Jie Liu <jeff.liu@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Ben Myers <bpm@sgi.com>