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authorTrond Myklebust <Trond.Myklebust@netapp.com>2008-10-05 14:48:22 -0400
committerTrond Myklebust <Trond.Myklebust@netapp.com>2008-10-07 17:59:43 -0400
commit691beb13cdc88358334ef0ba867c080a247a760f (patch)
tree35e0bb75f726f32962418902f33c5f779711dddc
parent2f28ea614ff497202d5a52af82da523ae4a20718 (diff)
NFS: Allow concurrent inode revalidation
Currently, if two processes are both trying to revalidate metadata for the same inode, they will find themselves being serialised. There is no good justification for this now that we have improved our ability to detect stale attribute data, so we should remove that serialisation. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
-rw-r--r--fs/nfs/inode.c43
-rw-r--r--include/linux/nfs_fs.h9
2 files changed, 6 insertions, 46 deletions
diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
index f3b8ed904df..e25009f35cc 100644
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -472,37 +472,6 @@ void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr)
}
}
-static int nfs_wait_schedule(void *word)
-{
- if (signal_pending(current))
- return -ERESTARTSYS;
- schedule();
- return 0;
-}
-
-/*
- * Wait for the inode to get unlocked.
- */
-static int nfs_wait_on_inode(struct inode *inode)
-{
- struct nfs_inode *nfsi = NFS_I(inode);
- int error;
-
- error = wait_on_bit_lock(&nfsi->flags, NFS_INO_REVALIDATING,
- nfs_wait_schedule, TASK_KILLABLE);
-
- return error;
-}
-
-static void nfs_wake_up_inode(struct inode *inode)
-{
- struct nfs_inode *nfsi = NFS_I(inode);
-
- clear_bit(NFS_INO_REVALIDATING, &nfsi->flags);
- smp_mb__after_clear_bit();
- wake_up_bit(&nfsi->flags, NFS_INO_REVALIDATING);
-}
-
int nfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
{
struct inode *inode = dentry->d_inode;
@@ -697,20 +666,15 @@ __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
dfprintk(PAGECACHE, "NFS: revalidating (%s/%Ld)\n",
inode->i_sb->s_id, (long long)NFS_FILEID(inode));
- nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE);
if (is_bad_inode(inode))
- goto out_nowait;
+ goto out;
if (NFS_STALE(inode))
- goto out_nowait;
-
- status = nfs_wait_on_inode(inode);
- if (status < 0)
goto out;
- status = -ESTALE;
if (NFS_STALE(inode))
goto out;
+ nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE);
status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), &fattr);
if (status != 0) {
dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) getattr failed, error=%d\n",
@@ -740,9 +704,6 @@ __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
(long long)NFS_FILEID(inode));
out:
- nfs_wake_up_inode(inode);
-
- out_nowait:
return status;
}
diff --git a/include/linux/nfs_fs.h b/include/linux/nfs_fs.h
index 78a5922a2f1..ca563ee13e3 100644
--- a/include/linux/nfs_fs.h
+++ b/include/linux/nfs_fs.h
@@ -200,11 +200,10 @@ struct nfs_inode {
/*
* Bit offsets in flags field
*/
-#define NFS_INO_REVALIDATING (0) /* revalidating attrs */
-#define NFS_INO_ADVISE_RDPLUS (1) /* advise readdirplus */
-#define NFS_INO_STALE (2) /* possible stale inode */
-#define NFS_INO_ACL_LRU_SET (3) /* Inode is on the LRU list */
-#define NFS_INO_MOUNTPOINT (4) /* inode is remote mountpoint */
+#define NFS_INO_ADVISE_RDPLUS (0) /* advise readdirplus */
+#define NFS_INO_STALE (1) /* possible stale inode */
+#define NFS_INO_ACL_LRU_SET (2) /* Inode is on the LRU list */
+#define NFS_INO_MOUNTPOINT (3) /* inode is remote mountpoint */
static inline struct nfs_inode *NFS_I(const struct inode *inode)
{