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pNFS: Fix bugs in _pnfs_return_layout 

We need to honour the NFS_LAYOUT_RETURN_REQUESTED bit regardless of
whether or not there are layout segments pending.
Furthermore, we should ensure that we leave the plh_return_segs list
empty.

This patch fixes a memory leak of the layout segments on plh_return_segs.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
This commit is contained in:
Trond Myklebust 2016-11-30 10:19:09 -05:00
parent fe1cf9469d
commit 24408f5282
1 changed files with 10 additions and 3 deletions
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13
fs/nfs/pnfs.c
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@ -1145,7 +1145,7 @@ _pnfs_return_layout(struct inode *ino)
struct nfs_inode *nfsi = NFS_I(ino);
LIST_HEAD(tmp_list);
nfs4_stateid stateid;
int status = 0, empty;
int status = 0;
bool send;
dprintk("NFS: %s for inode %lu\n", __func__, ino->i_ino);
@ -1159,7 +1159,14 @@ _pnfs_return_layout(struct inode *ino)
}
/* Reference matched in nfs4_layoutreturn_release */
pnfs_get_layout_hdr(lo);
empty = list_empty(&lo->plh_segs);
/* Is there an outstanding layoutreturn ? */
if (test_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags)) {
spin_unlock(&ino->i_lock);
if (wait_on_bit(&lo->plh_flags, NFS_LAYOUT_RETURN,
TASK_UNINTERRUPTIBLE))
goto out_put_layout_hdr;
spin_lock(&ino->i_lock);
}
pnfs_clear_layoutcommit(ino, &tmp_list);
pnfs_mark_matching_lsegs_invalid(lo, &tmp_list, NULL, 0);
@ -1173,7 +1180,7 @@ _pnfs_return_layout(struct inode *ino)
}
/* Don't send a LAYOUTRETURN if list was initially empty */
if (empty) {
if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags)) {
spin_unlock(&ino->i_lock);
dprintk("NFS: %s no layout segments to return\n", __func__);
goto out_put_layout_hdr;