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staging: lustre: lmv: correctly iput lmo_root 

Commit 8f18c8a48b ("staging: lustre: lmv: separate master object
with master stripe") changed how lmo_root inodes were managed,
particularly when LMV_HASH_FLAG_MIGRATION is not set.
Previously lsm_md_oinfo[0].lmo_root was always a borrowed
inode reference and didn't need to by iput().
Since the change, that special case only applies when
LMV_HASH_FLAG_MIGRATION is set

In the upstream (lustre-release) version of this patch [Commit
60e07b972114 ("LU-4690 lod: separate master object with master
stripe")] the for loop in the lmv_unpack_md() was changed to count
from 0 and to ignore entry 0 if LMV_HASH_FLAG_MIGRATION is set.
In the patch that got applied to Linux, that change was missing,
so lsm_md_oinfo[0].lmo_root is never iput().
This results in a "VFS: Busy inodes" warning at unmount.

Fixes: 8f18c8a48b ("staging: lustre: lmv: separate master object with master stripe")
Signed-off-by: NeilBrown <neilb@suse.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
NeilBrown 2018-02-23 09:09:33 +11:00 committed by Greg Kroah-Hartman
parent 01220025b1
commit 17556cdbe6
1 changed files with 1 additions and 1 deletions
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2
drivers/staging/lustre/lustre/lmv/lmv_obd.c
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@ -2695,7 +2695,7 @@ static int lmv_unpackmd(struct obd_export *exp, struct lmv_stripe_md **lsmp,
if (lsm && !lmm) {
int i;
for (i = 1; i < lsm->lsm_md_stripe_count; i++) {
for (i = 0; i < lsm->lsm_md_stripe_count; i++) {
/*
* For migrating inode, the master stripe and master
* object will be the same, so do not need iput, see