GFS2: Only do one directory search on create
Creation of a new inode requires a directory search in order to ensure
that we are not trying to create an inode with the same name as an
existing one. This was hidden away inside the create_ok() function.
In the case that there was an existing inode, and a lookup can be
substituted for a create (which is the case with regular files
when the O_EXCL flag is not in use) then we were doing a second
lookup in order to return the inode.
This patch merges these two lookups into one. This can be done by
passing a flag to gfs2_dir_search() to tell it to just return -EEXIST
in the cases where we don't actually want to look up the inode.
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
diff --git a/fs/gfs2/inode.c b/fs/gfs2/inode.c
index 5fbb8df..ede16ae7 100644
--- a/fs/gfs2/inode.c
+++ b/fs/gfs2/inode.c
@@ -313,7 +313,7 @@
goto out;
}
- inode = gfs2_dir_search(dir, name);
+ inode = gfs2_dir_search(dir, name, false);
if (IS_ERR(inode))
error = PTR_ERR(inode);
out:
@@ -346,17 +346,6 @@
if (!dip->i_inode.i_nlink)
return -ENOENT;
- error = gfs2_dir_check(&dip->i_inode, name, NULL);
- switch (error) {
- case -ENOENT:
- error = 0;
- break;
- case 0:
- return -EEXIST;
- default:
- return error;
- }
-
if (dip->i_entries == (u32)-1)
return -EFBIG;
if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1)
@@ -584,15 +573,19 @@
goto fail;
error = create_ok(dip, name, mode);
- if ((error == -EEXIST) && S_ISREG(mode) && !excl) {
- inode = gfs2_lookupi(dir, &dentry->d_name, 0);
- gfs2_glock_dq_uninit(ghs);
- d_instantiate(dentry, inode);
- return PTR_RET(inode);
- }
if (error)
goto fail_gunlock;
+ inode = gfs2_dir_search(dir, &dentry->d_name, !S_ISREG(mode) || excl);
+ error = PTR_ERR(inode);
+ if (!IS_ERR(inode)) {
+ gfs2_glock_dq_uninit(ghs);
+ d_instantiate(dentry, inode);
+ return 0;
+ } else if (error != -ENOENT) {
+ goto fail_gunlock;
+ }
+
arq = error = gfs2_diradd_alloc_required(dir, name);
if (error < 0)
goto fail_gunlock;