reiserfs: fixup xattr_root caching
The xattr_root caching was broken from my previous patch set. It wouldn't
cause corruption, but could cause decreased performance due to allocating
a larger chunk of the journal (~ 27 blocks) than it would actually use.
This patch loads the xattr root dentry at xattr initialization and creates
it on-demand. Since we're using the cached dentry, there's no point
in keeping lookup_or_create_dir around, so that's removed.
Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/reiserfs/xattr.c b/fs/reiserfs/xattr.c
index 2891f78..c779844 100644
--- a/fs/reiserfs/xattr.c
+++ b/fs/reiserfs/xattr.c
@@ -113,36 +113,28 @@
#define xattr_may_create(flags) (!flags || flags & XATTR_CREATE)
-/* Returns and possibly creates the xattr dir. */
-static struct dentry *lookup_or_create_dir(struct dentry *parent,
- const char *name, int flags)
-{
- struct dentry *dentry;
- BUG_ON(!parent);
-
- mutex_lock_nested(&parent->d_inode->i_mutex, I_MUTEX_XATTR);
- dentry = lookup_one_len(name, parent, strlen(name));
- if (!IS_ERR(dentry) && !dentry->d_inode) {
- int err = -ENODATA;
-
- if (xattr_may_create(flags))
- err = xattr_mkdir(parent->d_inode, dentry, 0700);
-
- if (err) {
- dput(dentry);
- dentry = ERR_PTR(err);
- }
- }
- mutex_unlock(&parent->d_inode->i_mutex);
- return dentry;
-}
-
static struct dentry *open_xa_root(struct super_block *sb, int flags)
{
struct dentry *privroot = REISERFS_SB(sb)->priv_root;
- if (!privroot)
+ struct dentry *xaroot;
+ if (!privroot->d_inode)
return ERR_PTR(-ENODATA);
- return lookup_or_create_dir(privroot, XAROOT_NAME, flags);
+
+ mutex_lock_nested(&privroot->d_inode->i_mutex, I_MUTEX_XATTR);
+
+ xaroot = dget(REISERFS_SB(sb)->xattr_root);
+ if (!xaroot->d_inode) {
+ int err = -ENODATA;
+ if (xattr_may_create(flags))
+ err = xattr_mkdir(privroot->d_inode, xaroot, 0700);
+ if (err) {
+ dput(xaroot);
+ xaroot = ERR_PTR(err);
+ }
+ }
+
+ mutex_unlock(&privroot->d_inode->i_mutex);
+ return xaroot;
}
static struct dentry *open_xa_dir(const struct inode *inode, int flags)
@@ -158,10 +150,22 @@
le32_to_cpu(INODE_PKEY(inode)->k_objectid),
inode->i_generation);
- xadir = lookup_or_create_dir(xaroot, namebuf, flags);
+ mutex_lock_nested(&xaroot->d_inode->i_mutex, I_MUTEX_XATTR);
+
+ xadir = lookup_one_len(namebuf, xaroot, strlen(namebuf));
+ if (!IS_ERR(xadir) && !xadir->d_inode) {
+ int err = -ENODATA;
+ if (xattr_may_create(flags))
+ err = xattr_mkdir(xaroot->d_inode, xadir, 0700);
+ if (err) {
+ dput(xadir);
+ xadir = ERR_PTR(err);
+ }
+ }
+
+ mutex_unlock(&xaroot->d_inode->i_mutex);
dput(xaroot);
return xadir;
-
}
/* The following are side effects of other operations that aren't explicitly
@@ -986,19 +990,33 @@
int reiserfs_xattr_init(struct super_block *s, int mount_flags)
{
int err = 0;
+ struct dentry *privroot = REISERFS_SB(s)->priv_root;
#ifdef CONFIG_REISERFS_FS_XATTR
err = xattr_mount_check(s);
if (err)
goto error;
- if (!REISERFS_SB(s)->priv_root->d_inode && !(mount_flags & MS_RDONLY)) {
+ if (!privroot->d_inode && !(mount_flags & MS_RDONLY)) {
mutex_lock(&s->s_root->d_inode->i_mutex);
err = create_privroot(REISERFS_SB(s)->priv_root);
mutex_unlock(&s->s_root->d_inode->i_mutex);
}
- if (!err)
+
+ if (privroot->d_inode) {
s->s_xattr = reiserfs_xattr_handlers;
+ mutex_lock(&privroot->d_inode->i_mutex);
+ if (!REISERFS_SB(s)->xattr_root) {
+ struct dentry *dentry;
+ dentry = lookup_one_len(XAROOT_NAME, privroot,
+ strlen(XAROOT_NAME));
+ if (!IS_ERR(dentry))
+ REISERFS_SB(s)->xattr_root = dentry;
+ else
+ err = PTR_ERR(dentry);
+ }
+ mutex_unlock(&privroot->d_inode->i_mutex);
+ }
error:
if (err) {
@@ -1008,11 +1026,12 @@
#endif
/* The super_block MS_POSIXACL must mirror the (no)acl mount option. */
- s->s_flags = s->s_flags & ~MS_POSIXACL;
#ifdef CONFIG_REISERFS_FS_POSIX_ACL
if (reiserfs_posixacl(s))
s->s_flags |= MS_POSIXACL;
+ else
#endif
+ s->s_flags &= ~MS_POSIXACL;
return err;
}