ext4: Don't use ext4_dec_count() if not needed

The ext4_dec_count() function is only needed when dropping the i_nlink
count on inodes which are (or which could be) directories.  If we
*know* that the inode in question can't possibly be a directory, use
drop_nlink or clear_nlink() if we know i_nlink is 1.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index fffd0807a01b4831bacf99f2ce55bae45479d401..5a79c6b6dc690f3ff95fb286c0bf564a3ba14cfa 100644 (file)
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -2161,7 +2161,7 @@ static int ext4_unlink(struct inode * dir, struct dentry *dentry)
        dir->i_ctime = dir->i_mtime = ext4_current_time(dir);
        ext4_update_dx_flag(dir);
        ext4_mark_inode_dirty(handle, dir);
-       ext4_dec_count(handle, inode);
+       drop_nlink(inode);
        if (!inode->i_nlink)
                ext4_orphan_add(handle, inode);
        inode->i_ctime = ext4_current_time(inode);
@@ -2211,7 +2211,7 @@ retry:
                err = __page_symlink(inode, symname, l,
                                mapping_gfp_mask(inode->i_mapping) & ~__GFP_FS);
                if (err) {
-                       ext4_dec_count(handle, inode);
+                       clear_nlink(inode);
                        ext4_mark_inode_dirty(handle, inode);
                        iput (inode);
                        goto out_stop;
@@ -2404,7 +2404,7 @@ static int ext4_rename (struct inode * old_dir, struct dentry *old_dentry,
                ext4_dec_count(handle, old_dir);
                if (new_inode) {
                        /* checked empty_dir above, can't have another parent,
-                        * ext3_dec_count() won't work for many-linked dirs */
+                        * ext4_dec_count() won't work for many-linked dirs */
                        new_inode->i_nlink = 0;
                } else {
                        ext4_inc_count(handle, new_dir);