pnfs: save layoutcommit cred at layout header init

No need to save it for every lseg.
No need to save it at every pnfs_set_layoutcommit.

[Needed in v3.0]
CC: Stable Tree <stable@kernel.org>
Signed-off-by: Peng Tao <peng_tao@emc.com>
Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
Signed-off-by: Jim Rees <rees@umich.edu>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c
index 7a948ab..ab2cb04 100644 (file)
--- a/fs/nfs/pnfs.c
+++ b/fs/nfs/pnfs.c
@@ -190,6 +190,7 @@ static void
 pnfs_free_layout_hdr(struct pnfs_layout_hdr *lo)
 {
        struct pnfs_layoutdriver_type *ld = NFS_SERVER(lo->plh_inode)->pnfs_curr_ld;
+       put_rpccred(lo->plh_lc_cred);
        return ld->alloc_layout_hdr ? ld->free_layout_hdr(lo) : kfree(lo);
 }
 
@@ -816,7 +817,9 @@ out:
 }
 
 static struct pnfs_layout_hdr *
-alloc_init_layout_hdr(struct inode *ino, gfp_t gfp_flags)
+alloc_init_layout_hdr(struct inode *ino,
+                     struct nfs_open_context *ctx,
+                     gfp_t gfp_flags)
 {
        struct pnfs_layout_hdr *lo;
 
@@ -828,11 +831,14 @@ alloc_init_layout_hdr(struct inode *ino, gfp_t gfp_flags)
        INIT_LIST_HEAD(&lo->plh_segs);
        INIT_LIST_HEAD(&lo->plh_bulk_recall);
        lo->plh_inode = ino;
+       lo->plh_lc_cred = get_rpccred(ctx->state->owner->so_cred);
        return lo;
 }
 
 static struct pnfs_layout_hdr *
-pnfs_find_alloc_layout(struct inode *ino, gfp_t gfp_flags)
+pnfs_find_alloc_layout(struct inode *ino,
+                      struct nfs_open_context *ctx,
+                      gfp_t gfp_flags)
 {
        struct nfs_inode *nfsi = NFS_I(ino);
        struct pnfs_layout_hdr *new = NULL;
@@ -847,7 +853,7 @@ pnfs_find_alloc_layout(struct inode *ino, gfp_t gfp_flags)
                        return nfsi->layout;
        }
        spin_unlock(&ino->i_lock);
-       new = alloc_init_layout_hdr(ino, gfp_flags);
+       new = alloc_init_layout_hdr(ino, ctx, gfp_flags);
        spin_lock(&ino->i_lock);
 
        if (likely(nfsi->layout == NULL))       /* Won the race? */
@@ -940,7 +946,7 @@ pnfs_update_layout(struct inode *ino,
        if (!pnfs_enabled_sb(NFS_SERVER(ino)))
                return NULL;
        spin_lock(&ino->i_lock);
-       lo = pnfs_find_alloc_layout(ino, gfp_flags);
+       lo = pnfs_find_alloc_layout(ino, ctx, gfp_flags);
        if (lo == NULL) {
                dprintk("%s ERROR: can't get pnfs_layout_hdr\n", __func__);
                goto out_unlock;
@@ -1373,8 +1379,6 @@ pnfs_set_layoutcommit(struct nfs_write_data *wdata)
        if (!test_and_set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) {
                /* references matched in nfs4_layoutcommit_release */
                get_lseg(wdata->lseg);
-               wdata->lseg->pls_lc_cred =
-                       get_rpccred(wdata->args.context->state->owner->so_cred);
                mark_as_dirty = true;
                dprintk("%s: Set layoutcommit for inode %lu ",
                        __func__, wdata->inode->i_ino);
@@ -1406,7 +1410,6 @@ pnfs_layoutcommit_inode(struct inode *inode, bool sync)
        struct nfs4_layoutcommit_data *data;
        struct nfs_inode *nfsi = NFS_I(inode);
        struct pnfs_layout_segment *lseg;
-       struct rpc_cred *cred;
        loff_t end_pos;
        int status = 0;
 
@@ -1436,9 +1439,7 @@ pnfs_layoutcommit_inode(struct inode *inode, bool sync)
        lseg = pnfs_list_write_lseg(inode);
 
        end_pos = nfsi->layout->plh_lwb;
-       cred = lseg->pls_lc_cred;
        nfsi->layout->plh_lwb = 0;
-       lseg->pls_lc_cred = NULL;
 
        memcpy(&data->args.stateid.data, nfsi->layout->plh_stateid.data,
                sizeof(nfsi->layout->plh_stateid.data));
@@ -1446,7 +1447,7 @@ pnfs_layoutcommit_inode(struct inode *inode, bool sync)
 
        data->args.inode = inode;
        data->lseg = lseg;
-       data->cred = cred;
+       data->cred = get_rpccred(nfsi->layout->plh_lc_cred);
        nfs_fattr_init(&data->fattr);
        data->args.bitmask = NFS_SERVER(inode)->cache_consistency_bitmask;
        data->res.fattr = &data->fattr;

diff --git a/fs/nfs/pnfs.h b/fs/nfs/pnfs.h
index 1eb2c04..1f5cb47 100644 (file)
--- a/fs/nfs/pnfs.h
+++ b/fs/nfs/pnfs.h
@@ -44,7 +44,6 @@ struct pnfs_layout_segment {
        atomic_t pls_refcount;
        unsigned long pls_flags;
        struct pnfs_layout_hdr *pls_layout;
-       struct rpc_cred *pls_lc_cred; /* LAYOUTCOMMIT credential */
 };
 
 enum pnfs_try_status {
@@ -125,6 +124,7 @@ struct pnfs_layout_hdr {
        u32                     plh_barrier; /* ignore lower seqids */
        unsigned long           plh_flags;
        loff_t                  plh_lwb; /* last write byte for layoutcommit */
+       struct rpc_cred         *plh_lc_cred; /* layoutcommit cred */
        struct inode            *plh_inode;
 };