NFSv4: Don't invalidate cached attributes if change attribute is unchanged

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 24 insertions, 20 deletions

diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
index 5746dc841a6c..0e1ef97bcf54 100644
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -1299,34 +1299,35 @@ static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fat
         if ((fattr->valid & NFS_ATTR_FATTR) == 0)
                 return 0;
 
+        /* Has the inode gone and changed behind our back? */
+        if (nfsi->fileid != fattr->fileid
+                        || (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) {
+                return -EIO;
+        }
+
         /* Are we in the process of updating data on the server? */
         data_unstable = nfs_caches_unstable(inode);
 
         /* Do atomic weak cache consistency updates */
         nfs_wcc_update_inode(inode, fattr);
 
-        if ((fattr->valid & NFS_ATTR_FATTR_V4) != 0 &&
-                        nfsi->change_attr != fattr->change_attr) {
+        if ((fattr->valid & NFS_ATTR_FATTR_V4) != 0) {
+                if (nfsi->change_attr == fattr->change_attr)
+                        goto out;
                 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
                 if (!data_unstable)
                         nfsi->cache_validity |= NFS_INO_REVAL_PAGECACHE;
         }
 
-        /* Has the inode gone and changed behind our back? */
-        if (nfsi->fileid != fattr->fileid
-                        || (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) {
-                return -EIO;
-        }
-
-        cur_size = i_size_read(inode);
-        new_isize = nfs_size_to_loff_t(fattr->size);
-
         /* Verify a few of the more important attributes */
         if (!timespec_equal(&inode->i_mtime, &fattr->mtime)) {
                 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
                 if (!data_unstable)
                         nfsi->cache_validity |= NFS_INO_REVAL_PAGECACHE;
         }
+
+        cur_size = i_size_read(inode);
+        new_isize = nfs_size_to_loff_t(fattr->size);
         if (cur_size != new_isize) {
                 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
                 if (nfsi->npages == 0)
@@ -1343,6 +1344,7 @@ static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fat
         if (inode->i_nlink != fattr->nlink)
                 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
 
+out:
         if (!timespec_equal(&inode->i_atime, &fattr->atime))
                 nfsi->cache_validity |= NFS_INO_INVALID_ATIME;
 
@@ -1481,15 +1483,6 @@ static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
                 nfsi->cache_change_attribute = jiffies;
         }
 
-        if ((fattr->valid & NFS_ATTR_FATTR_V4)
-            && nfsi->change_attr != fattr->change_attr) {
-                dprintk("NFS: change_attr change on server for file %s/%ld\n",
-                       inode->i_sb->s_id, inode->i_ino);
-                nfsi->change_attr = fattr->change_attr;
-                invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
-                nfsi->cache_change_attribute = jiffies;
-        }
-
         /* If ctime has changed we should definitely clear access+acl caches */
         if (!timespec_equal(&inode->i_ctime, &fattr->ctime)) {
                 invalid |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
@@ -1519,6 +1512,17 @@ static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
                 inode->i_blksize = fattr->du.nfs2.blocksize;
         }
 
+        if ((fattr->valid & NFS_ATTR_FATTR_V4)) {
+                if (nfsi->change_attr != fattr->change_attr) {
+                        dprintk("NFS: change_attr change on server for file %s/%ld\n",
+                                        inode->i_sb->s_id, inode->i_ino);
+                        nfsi->change_attr = fattr->change_attr;
+                        invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
+                        nfsi->cache_change_attribute = jiffies;
+                } else
+                        invalid &= ~(NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA);
+        }
+
         /* Update attrtimeo value if we're out of the unstable period */
         if (invalid & NFS_INO_INVALID_ATTR) {
                 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);