1 files changed, 83 insertions, 0 deletions

diff --git a/fs/cifs/cache.c b/fs/cifs/cache.c
index 15532abdac1..b2649cfd3a0 100644
--- a/fs/cifs/cache.c
+++ b/fs/cifs/cache.c
@@ -215,3 +215,86 @@ const struct fscache_cookie_def cifs_fscache_super_index_def = {
         .check_aux = cifs_fscache_super_check_aux,
 };
 
+/*
+ * Auxiliary data attached to CIFS inode within the cache
+ */
+struct cifs_fscache_inode_auxdata {
+        struct timespec last_write_time;
+        struct timespec last_change_time;
+        u64             eof;
+};
+
+static uint16_t cifs_fscache_inode_get_key(const void *cookie_netfs_data,
+                                           void *buffer, uint16_t maxbuf)
+{
+        const struct cifsInodeInfo *cifsi = cookie_netfs_data;
+        uint16_t keylen;
+
+        /* use the UniqueId as the key */
+        keylen = sizeof(cifsi->uniqueid);
+        if (keylen > maxbuf)
+                keylen = 0;
+        else
+                memcpy(buffer, &cifsi->uniqueid, keylen);
+
+        return keylen;
+}
+
+static void
+cifs_fscache_inode_get_attr(const void *cookie_netfs_data, uint64_t *size)
+{
+        const struct cifsInodeInfo *cifsi = cookie_netfs_data;
+
+        *size = cifsi->vfs_inode.i_size;
+}
+
+static uint16_t
+cifs_fscache_inode_get_aux(const void *cookie_netfs_data, void *buffer,
+                           uint16_t maxbuf)
+{
+        struct cifs_fscache_inode_auxdata auxdata;
+        const struct cifsInodeInfo *cifsi = cookie_netfs_data;
+
+        memset(&auxdata, 0, sizeof(auxdata));
+        auxdata.eof = cifsi->server_eof;
+        auxdata.last_write_time = cifsi->vfs_inode.i_mtime;
+        auxdata.last_change_time = cifsi->vfs_inode.i_ctime;
+
+        if (maxbuf > sizeof(auxdata))
+                maxbuf = sizeof(auxdata);
+
+        memcpy(buffer, &auxdata, maxbuf);
+
+        return maxbuf;
+}
+
+static enum
+fscache_checkaux cifs_fscache_inode_check_aux(void *cookie_netfs_data,
+                                              const void *data,
+                                              uint16_t datalen)
+{
+        struct cifs_fscache_inode_auxdata auxdata;
+        struct cifsInodeInfo *cifsi = cookie_netfs_data;
+
+        if (datalen != sizeof(auxdata))
+                return FSCACHE_CHECKAUX_OBSOLETE;
+
+        memset(&auxdata, 0, sizeof(auxdata));
+        auxdata.eof = cifsi->server_eof;
+        auxdata.last_write_time = cifsi->vfs_inode.i_mtime;
+        auxdata.last_change_time = cifsi->vfs_inode.i_ctime;
+
+        if (memcmp(data, &auxdata, datalen) != 0)
+                return FSCACHE_CHECKAUX_OBSOLETE;
+
+        return FSCACHE_CHECKAUX_OKAY;
+}
+
+const struct fscache_cookie_def cifs_fscache_inode_object_def = {
+        .name           = "CIFS.uniqueid",
+        .type           = FSCACHE_COOKIE_TYPE_DATAFILE,
+        .get_key        = cifs_fscache_inode_get_key,
+        .get_attr       = cifs_fscache_inode_get_attr,
+        .get_aux        = cifs_fscache_inode_get_aux,
+        .check_aux      = cifs_fscache_inode_check_aux,
+};