fs/9p: Add hardlink support to .u extension

For regular file and directories we put the link
count in th extension field in a tagged string format.

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

1 files changed, 18 insertions, 1 deletions

diff --git a/fs/9p/vfs_inode.c b/fs/9p/vfs_inode.c
index d3d3c3c2000..5fe45d692c9 100644
--- a/fs/9p/vfs_inode.c
+++ b/fs/9p/vfs_inode.c
@@ -887,6 +887,8 @@ v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode,
         struct super_block *sb)
 {
         char ext[32];
+        char tag_name[14];
+        unsigned int i_nlink;
         struct v9fs_session_info *v9ses = sb->s_fs_info;
 
         inode->i_nlink = 1;
@@ -902,7 +904,22 @@ v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode,
                 inode->i_uid = stat->n_uid;
                 inode->i_gid = stat->n_gid;
         }
-
+        if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) {
+                if (v9fs_proto_dotu(v9ses) && (stat->extension[0] != '\0')) {
+                        /*
+                         * Hadlink support got added later to
+                         * to the .u extension. So there can be
+                         * server out there that doesn't support
+                         * this even with .u extension. So check
+                         * for non NULL stat->extension
+                         */
+                        strncpy(ext, stat->extension, sizeof(ext));
+                        /* HARDLINKCOUNT %u */
+                        sscanf(ext, "%13s %u", tag_name, &i_nlink);
+                        if (!strncmp(tag_name, "HARDLINKCOUNT", 13))
+                                inode->i_nlink = i_nlink;
+                }
+        }
         inode->i_mode = p9mode2unixmode(v9ses, stat->mode);
         if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode))) {
                 char type = 0;