reiserfs: eliminate per-super xattr lock

With the switch to using inode->i_mutex locking during lookups/creation
in the xattr root, the per-super xattr lock is no longer needed.

This patch removes it.

Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 33 insertions, 41 deletions

diff --git a/fs/reiserfs/xattr_acl.c b/fs/reiserfs/xattr_acl.c
index 9128e4d5ba6..d63b2c5850c 100644
--- a/fs/reiserfs/xattr_acl.c
+++ b/fs/reiserfs/xattr_acl.c
@@ -172,6 +172,29 @@ static void *posix_acl_to_disk(const struct posix_acl *acl, size_t * size)
         return ERR_PTR(-EINVAL);
 }
 
+static inline void iset_acl(struct inode *inode, struct posix_acl **i_acl,
+                            struct posix_acl *acl)
+{
+        spin_lock(&inode->i_lock);
+        if (*i_acl != ERR_PTR(-ENODATA))
+                posix_acl_release(*i_acl);
+        *i_acl = posix_acl_dup(acl);
+        spin_unlock(&inode->i_lock);
+}
+
+static inline struct posix_acl *iget_acl(struct inode *inode,
+                                         struct posix_acl **i_acl)
+{
+        struct posix_acl *acl = ERR_PTR(-ENODATA);
+
+        spin_lock(&inode->i_lock);
+        if (*i_acl != ERR_PTR(-ENODATA))
+                acl = posix_acl_dup(*i_acl);
+        spin_unlock(&inode->i_lock);
+
+        return acl;
+}
+
 /*
  * Inode operation get_posix_acl().
  *
@@ -199,11 +222,11 @@ struct posix_acl *reiserfs_get_acl(struct inode *inode, int type)
                 return ERR_PTR(-EINVAL);
         }
 
-        if (IS_ERR(*p_acl)) {
-                if (PTR_ERR(*p_acl) == -ENODATA)
-                        return NULL;
-        } else if (*p_acl != NULL)
-                return posix_acl_dup(*p_acl);
+        acl = iget_acl(inode, p_acl);
+        if (acl && !IS_ERR(acl))
+                return acl;
+        else if (PTR_ERR(acl) == -ENODATA)
+                return NULL;
 
         size = reiserfs_xattr_get(inode, name, NULL, 0);
         if (size < 0) {
@@ -229,7 +252,7 @@ struct posix_acl *reiserfs_get_acl(struct inode *inode, int type)
         } else {
                 acl = posix_acl_from_disk(value, retval);
                 if (!IS_ERR(acl))
-                        *p_acl = posix_acl_dup(acl);
+                        iset_acl(inode, p_acl, acl);
         }
 
         kfree(value);
@@ -300,16 +323,8 @@ reiserfs_set_acl(struct inode *inode, int type, struct posix_acl *acl)
 
         kfree(value);
 
-        if (!error) {
-                /* Release the old one */
-                if (!IS_ERR(*p_acl) && *p_acl)
-                        posix_acl_release(*p_acl);
-
-                if (acl == NULL)
-                        *p_acl = ERR_PTR(-ENODATA);
-                else
-                        *p_acl = posix_acl_dup(acl);
-        }
+        if (!error)
+                iset_acl(inode, p_acl, acl);
 
         return error;
 }
@@ -404,9 +419,7 @@ int reiserfs_cache_default_acl(struct inode *inode)
         if (reiserfs_posixacl(inode->i_sb) && !IS_PRIVATE(inode)) {
                 struct posix_acl *acl;
                 reiserfs_read_lock_xattr_i(inode);
-                reiserfs_read_lock_xattrs(inode->i_sb);
                 acl = reiserfs_get_acl(inode, ACL_TYPE_DEFAULT);
-                reiserfs_read_unlock_xattrs(inode->i_sb);
                 reiserfs_read_unlock_xattr_i(inode);
                 ret = (acl && !IS_ERR(acl));
                 if (ret)
@@ -429,9 +442,7 @@ int reiserfs_acl_chmod(struct inode *inode)
                 return 0;
         }
 
-        reiserfs_read_lock_xattrs(inode->i_sb);
         acl = reiserfs_get_acl(inode, ACL_TYPE_ACCESS);
-        reiserfs_read_unlock_xattrs(inode->i_sb);
         if (!acl)
                 return 0;
         if (IS_ERR(acl))
@@ -442,17 +453,8 @@ int reiserfs_acl_chmod(struct inode *inode)
                 return -ENOMEM;
         error = posix_acl_chmod_masq(clone, inode->i_mode);
         if (!error) {
-                int lock = !has_xattr_dir(inode);
                 reiserfs_write_lock_xattr_i(inode);
-                if (lock)
-                        reiserfs_write_lock_xattrs(inode->i_sb);
-                else
-                        reiserfs_read_lock_xattrs(inode->i_sb);
                 error = reiserfs_set_acl(inode, ACL_TYPE_ACCESS, clone);
-                if (lock)
-                        reiserfs_write_unlock_xattrs(inode->i_sb);
-                else
-                        reiserfs_read_unlock_xattrs(inode->i_sb);
                 reiserfs_write_unlock_xattr_i(inode);
         }
         posix_acl_release(clone);
@@ -480,14 +482,9 @@ posix_acl_access_set(struct inode *inode, const char *name,
 static int posix_acl_access_del(struct inode *inode, const char *name)
 {
         struct reiserfs_inode_info *reiserfs_i = REISERFS_I(inode);
-        struct posix_acl **acl = &reiserfs_i->i_acl_access;
         if (strlen(name) != sizeof(POSIX_ACL_XATTR_ACCESS) - 1)
                 return -EINVAL;
-        if (!IS_ERR(*acl) && *acl) {
-                posix_acl_release(*acl);
-                *acl = ERR_PTR(-ENODATA);
-        }
-
+        iset_acl(inode, &reiserfs_i->i_acl_access, ERR_PTR(-ENODATA));
         return 0;
 }
 
@@ -533,14 +530,9 @@ posix_acl_default_set(struct inode *inode, const char *name,
 static int posix_acl_default_del(struct inode *inode, const char *name)
 {
         struct reiserfs_inode_info *reiserfs_i = REISERFS_I(inode);
-        struct posix_acl **acl = &reiserfs_i->i_acl_default;
         if (strlen(name) != sizeof(POSIX_ACL_XATTR_DEFAULT) - 1)
                 return -EINVAL;
-        if (!IS_ERR(*acl) && *acl) {
-                posix_acl_release(*acl);
-                *acl = ERR_PTR(-ENODATA);
-        }
-
+        iset_acl(inode, &reiserfs_i->i_acl_default, ERR_PTR(-ENODATA));
         return 0;
 }