NFS: Fix attribute revalidation

Don't mark attributes as invalid just because they have changed. Instead,
for the purposes of adjusting the attribute cache timeout, keep a
separate variable that tracks whether or not a change occurred.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>

diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
index 2b7edd0..f35c5eb 100644 (file)
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -1788,6 +1788,7 @@ static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
        unsigned long save_cache_validity;
        bool have_writers = nfs_file_has_buffered_writers(nfsi);
        bool cache_revalidated = true;
+       bool attr_changed = false;
 
        dfprintk(VFS, "NFS: %s(%s/%lu fh_crc=0x%08x ct=%d info=0x%x)\n",
                        __func__, inode->i_sb->s_id, inode->i_ino,
@@ -1848,8 +1849,7 @@ static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
                                        inode->i_sb->s_id, inode->i_ino);
                        /* Could it be a race with writeback? */
                        if (!have_writers) {
-                               invalid |= NFS_INO_INVALID_CHANGE
-                                       | NFS_INO_INVALID_DATA
+                               invalid |= NFS_INO_INVALID_DATA
                                        | NFS_INO_INVALID_ACCESS
                                        | NFS_INO_INVALID_ACL;
                                /* Force revalidate of all attributes */
@@ -1861,6 +1861,7 @@ static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
                                        nfs_force_lookup_revalidate(inode);
                        }
                        inode_set_iversion_raw(inode, fattr->change_attr);
+                       attr_changed = true;
                }
        } else {
                nfsi->cache_validity |= save_cache_validity &
@@ -1899,6 +1900,7 @@ static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
                                i_size_write(inode, new_isize);
                                if (!have_writers)
                                        invalid |= NFS_INO_INVALID_DATA;
+                               attr_changed = true;
                        }
                        dprintk("NFS: isize change on server for file %s/%ld "
                                        "(%Ld to %Ld)\n",
@@ -1931,14 +1933,12 @@ static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
                        newmode |= fattr->mode & S_IALLUGO;
                        inode->i_mode = newmode;
                        invalid |= NFS_INO_INVALID_ACCESS
-                               | NFS_INO_INVALID_ACL
-                               | NFS_INO_INVALID_OTHER;
+                               | NFS_INO_INVALID_ACL;
+                       attr_changed = true;
                }
        } else if (server->caps & NFS_CAP_MODE) {
                nfsi->cache_validity |= save_cache_validity &
-                               (NFS_INO_INVALID_ACCESS
-                               | NFS_INO_INVALID_ACL
-                               | NFS_INO_INVALID_OTHER
+                               (NFS_INO_INVALID_OTHER
                                | NFS_INO_REVAL_FORCED);
                cache_revalidated = false;
        }
@@ -1946,15 +1946,13 @@ static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
        if (fattr->valid & NFS_ATTR_FATTR_OWNER) {
                if (!uid_eq(inode->i_uid, fattr->uid)) {
                        invalid |= NFS_INO_INVALID_ACCESS
-                               | NFS_INO_INVALID_ACL
-                               | NFS_INO_INVALID_OTHER;
+                               | NFS_INO_INVALID_ACL;
                        inode->i_uid = fattr->uid;
+                       attr_changed = true;
                }
        } else if (server->caps & NFS_CAP_OWNER) {
                nfsi->cache_validity |= save_cache_validity &
-                               (NFS_INO_INVALID_ACCESS
-                               | NFS_INO_INVALID_ACL
-                               | NFS_INO_INVALID_OTHER
+                               (NFS_INO_INVALID_OTHER
                                | NFS_INO_REVAL_FORCED);
                cache_revalidated = false;
        }
@@ -1962,25 +1960,23 @@ static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
        if (fattr->valid & NFS_ATTR_FATTR_GROUP) {
                if (!gid_eq(inode->i_gid, fattr->gid)) {
                        invalid |= NFS_INO_INVALID_ACCESS
-                               | NFS_INO_INVALID_ACL
-                               | NFS_INO_INVALID_OTHER;
+                               | NFS_INO_INVALID_ACL;
                        inode->i_gid = fattr->gid;
+                       attr_changed = true;
                }
        } else if (server->caps & NFS_CAP_OWNER_GROUP) {
                nfsi->cache_validity |= save_cache_validity &
-                               (NFS_INO_INVALID_ACCESS
-                               | NFS_INO_INVALID_ACL
-                               | NFS_INO_INVALID_OTHER
+                               (NFS_INO_INVALID_OTHER
                                | NFS_INO_REVAL_FORCED);
                cache_revalidated = false;
        }
 
        if (fattr->valid & NFS_ATTR_FATTR_NLINK) {
                if (inode->i_nlink != fattr->nlink) {
-                       invalid |= NFS_INO_INVALID_OTHER;
                        if (S_ISDIR(inode->i_mode))
                                invalid |= NFS_INO_INVALID_DATA;
                        set_nlink(inode, fattr->nlink);
+                       attr_changed = true;
                }
        } else if (server->caps & NFS_CAP_NLINK) {
                nfsi->cache_validity |= save_cache_validity &
@@ -2000,7 +1996,7 @@ static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
                cache_revalidated = false;
 
        /* Update attrtimeo value if we're out of the unstable period */
-       if (invalid & NFS_INO_INVALID_ATTR) {
+       if (attr_changed) {
                invalid &= ~NFS_INO_INVALID_ATTR;
                nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
                nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);