ocfs2: Directory c/mtime update fixes

ocfs2 wasn't updating c/mtime on directories during dirent
creation/deletion. Fix ocfs2_unlink(), ocfs2_rename() and
__ocfs2_add_entry() by adding the proper code to update the struct inode and
push the change out to disk.

This helps rename/unlink on nfs exported file systems in particular as those
clients compare directory time values to avoid a full re-reading a directory
which hasn't changed.

ocfs2_rename() loses some superfluous error handling as a result of this
patch.

Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>

1 files changed, 37 insertions, 32 deletions

diff --git a/fs/ocfs2/namei.c b/fs/ocfs2/namei.c
index 9637039c2633..f3d7803b4b46 100644
--- a/fs/ocfs2/namei.c
+++ b/fs/ocfs2/namei.c
@@ -932,14 +932,15 @@ static int ocfs2_unlink(struct inode *dir,
                 goto leave;
         }
 
-        if (S_ISDIR(inode->i_mode)) {
+        dir->i_ctime = dir->i_mtime = CURRENT_TIME;
+        if (S_ISDIR(inode->i_mode))
                 drop_nlink(dir);
-                status = ocfs2_mark_inode_dirty(handle, dir,
-                                                parent_node_bh);
-                if (status < 0) {
-                        mlog_errno(status);
+
+        status = ocfs2_mark_inode_dirty(handle, dir, parent_node_bh);
+        if (status < 0) {
+                mlog_errno(status);
+                if (S_ISDIR(inode->i_mode))
                         inc_nlink(dir);
-                }
         }
 
 leave:
@@ -1068,6 +1069,7 @@ static int ocfs2_rename(struct inode *old_dir,
         char orphan_name[OCFS2_ORPHAN_NAMELEN + 1];
         struct buffer_head *orphan_entry_bh = NULL;
         struct buffer_head *newfe_bh = NULL;
+        struct buffer_head *old_inode_bh = NULL;
         struct buffer_head *insert_entry_bh = NULL;
         struct ocfs2_super *osb = NULL;
         u64 newfe_blkno;
@@ -1079,7 +1081,7 @@ static int ocfs2_rename(struct inode *old_dir,
         struct buffer_head *new_de_bh = NULL, *old_de_bh = NULL; // bhs for above
         struct buffer_head *old_inode_de_bh = NULL; // if old_dentry is a dir,
                                                     // this is the 1st dirent bh
-        nlink_t old_dir_nlink = old_dir->i_nlink, new_dir_nlink = new_dir->i_nlink;
+        nlink_t old_dir_nlink = old_dir->i_nlink;
 
         /* At some point it might be nice to break this function up a
          * bit. */
@@ -1139,12 +1141,11 @@ static int ocfs2_rename(struct inode *old_dir,
         }
 
         /*
-         * Though we don't require an inode meta data update if
-         * old_inode is not a directory, we lock anyway here to ensure
-         * the vote thread on other nodes won't have to concurrently
-         * downconvert the inode and the dentry locks.
+         * Aside from allowing a meta data update, the locking here
+         * also ensures that the vote thread on other nodes won't have
+         * to concurrently downconvert the inode and the dentry locks.
          */
-        status = ocfs2_meta_lock(old_inode, NULL, 1);
+        status = ocfs2_meta_lock(old_inode, &old_inode_bh, 1);
         if (status < 0) {
                 if (status != -ENOENT)
                         mlog_errno(status);
@@ -1355,6 +1356,7 @@ static int ocfs2_rename(struct inode *old_dir,
 
         old_inode->i_ctime = CURRENT_TIME;
         mark_inode_dirty(old_inode);
+        ocfs2_mark_inode_dirty(handle, old_inode, old_inode_bh);
 
         /* now that the name has been added to new_dir, remove the old name */
         status = ocfs2_delete_entry(handle, old_dir, old_de, old_de_bh);
@@ -1384,27 +1386,22 @@ static int ocfs2_rename(struct inode *old_dir,
                 }
         }
         mark_inode_dirty(old_dir);
-        if (new_inode)
+        ocfs2_mark_inode_dirty(handle, old_dir, old_dir_bh);
+        if (new_inode) {
                 mark_inode_dirty(new_inode);
+                ocfs2_mark_inode_dirty(handle, new_inode, newfe_bh);
+        }
 
-        if (old_dir != new_dir)
-                if (new_dir_nlink != new_dir->i_nlink) {
-                        if (!new_dir_bh) {
-                                mlog(ML_ERROR, "need to change nlink for new "
-                                     "dir %llu from %d to %d but bh is NULL\n",
-                                     (unsigned long long)OCFS2_I(new_dir)->ip_blkno,
-                                     (int)new_dir_nlink, new_dir->i_nlink);
-                        } else {
-                                struct ocfs2_dinode *fe;
-                                status = ocfs2_journal_access(handle,
-                                                              new_dir,
-                                                              new_dir_bh,
-                                                              OCFS2_JOURNAL_ACCESS_WRITE);
-                                fe = (struct ocfs2_dinode *) new_dir_bh->b_data;
-                                fe->i_links_count = cpu_to_le16(new_dir->i_nlink);
-                                status = ocfs2_journal_dirty(handle, new_dir_bh);
-                        }
-                }
+        if (old_dir != new_dir) {
+                /* Keep the same times on both directories.*/
+                new_dir->i_ctime = new_dir->i_mtime = old_dir->i_ctime;
+
+                /*
+                 * This will also pick up the i_nlink change from the
+                 * block above.
+                 */
+                ocfs2_mark_inode_dirty(handle, new_dir, new_dir_bh);
+        }
 
         if (old_dir_nlink != old_dir->i_nlink) {
                 if (!old_dir_bh) {
@@ -1455,6 +1452,8 @@ bail:
                 iput(new_inode);
         if (newfe_bh)
                 brelse(newfe_bh);
+        if (old_inode_bh)
+                brelse(old_inode_bh);
         if (old_dir_bh)
                 brelse(old_dir_bh);
         if (new_dir_bh)
@@ -1826,6 +1825,13 @@ static int __ocfs2_add_entry(handle_t *handle,
                      (le16_to_cpu(de->rec_len) >= rec_len)) ||
                     (le16_to_cpu(de->rec_len) >=
                      (OCFS2_DIR_REC_LEN(de->name_len) + rec_len))) {
+                        dir->i_mtime = dir->i_ctime = CURRENT_TIME;
+                        retval = ocfs2_mark_inode_dirty(handle, dir, parent_fe_bh);
+                        if (retval < 0) {
+                                mlog_errno(retval);
+                                goto bail;
+                        }
+
                         status = ocfs2_journal_access(handle, dir, insert_bh,
                                                       OCFS2_JOURNAL_ACCESS_WRITE);
                         /* By now the buffer is marked for journaling */
@@ -1848,7 +1854,6 @@ static int __ocfs2_add_entry(handle_t *handle,
                         de->name_len = namelen;
                         memcpy(de->name, name, namelen);
 
-                        dir->i_mtime = dir->i_ctime = CURRENT_TIME;
                         dir->i_version++;
                         status = ocfs2_journal_dirty(handle, insert_bh);
                         retval = 0;