fs/9p: Add support for marking inode attribute invalid

With cached mode some of the file system operation result
in updating inode attributes (ctime). Add support for
marking inode attribute invalid in such cases so that
we fetch the updated inode attribute on dentry revalidation.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>

1 files changed, 27 insertions, 0 deletions

diff --git a/fs/9p/vfs_inode_dotl.c b/fs/9p/vfs_inode_dotl.c
index c6d9677dcb6e..5c04d66afb1d 100644
--- a/fs/9p/vfs_inode_dotl.c
+++ b/fs/9p/vfs_inode_dotl.c
@@ -484,6 +484,7 @@ int v9fs_vfs_setattr_dotl(struct dentry *dentry, struct iattr *iattr)
 void
 v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode)
 {
+        struct v9fs_inode *v9inode = V9FS_I(inode);
 
         if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) {
                 inode->i_atime.tv_sec = stat->st_atime_sec;
@@ -542,6 +543,7 @@ v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode)
         /* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION
          * because the inode structure does not have fields for them.
          */
+        v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
 }
 
 static int
@@ -822,6 +824,31 @@ ndset:
         return NULL;
 }
 
+int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode)
+{
+        loff_t i_size;
+        struct p9_stat_dotl *st;
+        struct v9fs_session_info *v9ses;
+
+        v9ses = v9fs_inode2v9ses(inode);
+        st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
+        if (IS_ERR(st))
+                return PTR_ERR(st);
+
+        spin_lock(&inode->i_lock);
+        /*
+         * We don't want to refresh inode->i_size,
+         * because we may have cached data
+         */
+        i_size = inode->i_size;
+        v9fs_stat2inode_dotl(st, inode);
+        if (v9ses->cache)
+                inode->i_size = i_size;
+        spin_unlock(&inode->i_lock);
+        kfree(st);
+        return 0;
+}
+
 const struct inode_operations v9fs_dir_inode_operations_dotl = {
         .create = v9fs_vfs_create_dotl,
         .lookup = v9fs_vfs_lookup,