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nfs41: close a small race window when adding new layout to global list 

Signed-off-by: Peng Tao <tao.peng@primarydata.com>
Signed-off-by: Tom Haynes <Thomas.Haynes@primarydata.com>
This commit is contained in:
Peng Tao 2014-08-22 17:37:40 +08:00 committed by Tom Haynes
parent 72cff4494e
commit abb9a0079c
1 changed files with 3 additions and 5 deletions
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8
fs/nfs/pnfs.c
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@ -1288,7 +1288,6 @@ pnfs_update_layout(struct inode *ino,
struct nfs_client *clp = server->nfs_client;
struct pnfs_layout_hdr *lo;
struct pnfs_layout_segment *lseg = NULL;
bool first;
if (!pnfs_enabled_sb(NFS_SERVER(ino)))
goto out;
@ -1321,16 +1320,15 @@ pnfs_update_layout(struct inode *ino,
if (pnfs_layoutgets_blocked(lo, 0))
goto out_unlock;
atomic_inc(&lo->plh_outstanding);
first = list_empty(&lo->plh_layouts) ? true : false;
spin_unlock(&ino->i_lock);
if (first) {
if (list_empty(&lo->plh_layouts)) {
/* The lo must be on the clp list if there is any
* chance of a CB_LAYOUTRECALL(FILE) coming in.
*/
spin_lock(&clp->cl_lock);
list_add_tail(&lo->plh_layouts, &server->layouts);
if (list_empty(&lo->plh_layouts))
list_add_tail(&lo->plh_layouts, &server->layouts);
spin_unlock(&clp->cl_lock);
}