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staging/lustre/lloop: avoid panic during blockdev_info

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Change the LL_IOC_LLOOP_INFO ioctl in the lustre lloop
device driver to return an error instead of causing
panics with LASSERT().

Signed-off-by: Bob Glossman <bob.glossman@intel.com>
Reviewed-on: http://review.whamcloud.com/9888
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-4863
Reviewed-by: Nathaniel Clark <nathaniel.l.clark@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Signed-off-by: Oleg Drokin <oleg.drokin@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Bob Glossman 2014-04-27 13:07:02 -04:00 committed by Greg Kroah-Hartman
parent 73b8990780
commit 4de665c1b3
1 changed files with 4 additions and 1 deletions
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5
drivers/staging/lustre/lustre/llite/lloop.c
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@ -624,7 +624,10 @@ static int lo_ioctl(struct block_device *bdev, fmode_t mode,
case LL_IOC_LLOOP_INFO: {
struct lu_fid fid;
LASSERT(lo->lo_backing_file != NULL);
if (lo->lo_backing_file == NULL) {
err = -ENOENT;
break;
}
if (inode == NULL)
inode = lo->lo_backing_file->f_dentry->d_inode;
if (lo->lo_state == LLOOP_BOUND)