1 files changed, 132 insertions, 128 deletions

diff --git a/fs/reiserfs/xattr.c b/fs/reiserfs/xattr.c
index f83f52bae390..8e7deb0e6964 100644
--- a/fs/reiserfs/xattr.c
+++ b/fs/reiserfs/xattr.c
@@ -113,41 +113,30 @@ static int xattr_rmdir(struct inode *dir, struct dentry *dentry)
 
 #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)
+static struct dentry *open_xa_root(struct super_block *sb, int flags)
 {
-        struct dentry *dentry;
-        BUG_ON(!parent);
-
-        dentry = lookup_one_len(name, parent, strlen(name));
-        if (IS_ERR(dentry))
-                return dentry;
-        else if (!dentry->d_inode) {
-                int err = -ENODATA;
+        struct dentry *privroot = REISERFS_SB(sb)->priv_root;
+        struct dentry *xaroot;
+        if (!privroot->d_inode)
+                return ERR_PTR(-ENODATA);
 
-                if (xattr_may_create(flags)) {
-                        mutex_lock_nested(&parent->d_inode->i_mutex,
-                                          I_MUTEX_XATTR);
-                        err = xattr_mkdir(parent->d_inode, dentry, 0700);
-                        mutex_unlock(&parent->d_inode->i_mutex);
-                }
+        mutex_lock_nested(&privroot->d_inode->i_mutex, I_MUTEX_XATTR);
 
+        xaroot = dget(REISERFS_SB(sb)->xattr_root);
+        if (!xaroot)
+                xaroot = ERR_PTR(-ENODATA);
+        else if (!xaroot->d_inode) {
+                int err = -ENODATA;
+                if (xattr_may_create(flags))
+                        err = xattr_mkdir(privroot->d_inode, xaroot, 0700);
                 if (err) {
-                        dput(dentry);
-                        dentry = ERR_PTR(err);
+                        dput(xaroot);
+                        xaroot = ERR_PTR(err);
                 }
         }
 
-        return dentry;
-}
-
-static struct dentry *open_xa_root(struct super_block *sb, int flags)
-{
-        struct dentry *privroot = REISERFS_SB(sb)->priv_root;
-        if (!privroot)
-                return ERR_PTR(-ENODATA);
-        return lookup_or_create_dir(privroot, XAROOT_NAME, flags);
+        mutex_unlock(&privroot->d_inode->i_mutex);
+        return xaroot;
 }
 
 static struct dentry *open_xa_dir(const struct inode *inode, int flags)
@@ -163,10 +152,22 @@ static struct dentry *open_xa_dir(const struct inode *inode, int flags)
                  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
@@ -184,6 +185,7 @@ fill_with_dentries(void *buf, const char *name, int namelen, loff_t offset,
 {
         struct reiserfs_dentry_buf *dbuf = buf;
         struct dentry *dentry;
+        WARN_ON_ONCE(!mutex_is_locked(&dbuf->xadir->d_inode->i_mutex));
 
         if (dbuf->count == ARRAY_SIZE(dbuf->dentries))
                 return -ENOSPC;
@@ -349,6 +351,7 @@ static struct dentry *xattr_lookup(struct inode *inode, const char *name,
         if (IS_ERR(xadir))
                 return ERR_CAST(xadir);
 
+        mutex_lock_nested(&xadir->d_inode->i_mutex, I_MUTEX_XATTR);
         xafile = lookup_one_len(name, xadir, strlen(name));
         if (IS_ERR(xafile)) {
                 err = PTR_ERR(xafile);
@@ -360,18 +363,15 @@ static struct dentry *xattr_lookup(struct inode *inode, const char *name,
 
         if (!xafile->d_inode) {
                 err = -ENODATA;
-                if (xattr_may_create(flags)) {
-                        mutex_lock_nested(&xadir->d_inode->i_mutex,
-                                          I_MUTEX_XATTR);
+                if (xattr_may_create(flags))
                         err = xattr_create(xadir->d_inode, xafile,
                                               0700|S_IFREG);
-                        mutex_unlock(&xadir->d_inode->i_mutex);
-                }
         }
 
         if (err)
                 dput(xafile);
 out:
+        mutex_unlock(&xadir->d_inode->i_mutex);
         dput(xadir);
         if (err)
                 return ERR_PTR(err);
@@ -435,6 +435,7 @@ static int lookup_and_delete_xattr(struct inode *inode, const char *name)
         if (IS_ERR(xadir))
                 return PTR_ERR(xadir);
 
+        mutex_lock_nested(&xadir->d_inode->i_mutex, I_MUTEX_XATTR);
         dentry = lookup_one_len(name, xadir, strlen(name));
         if (IS_ERR(dentry)) {
                 err = PTR_ERR(dentry);
@@ -442,14 +443,13 @@ static int lookup_and_delete_xattr(struct inode *inode, const char *name)
         }
 
         if (dentry->d_inode) {
-                mutex_lock_nested(&xadir->d_inode->i_mutex, I_MUTEX_XATTR);
                 err = xattr_unlink(xadir->d_inode, dentry);
-                mutex_unlock(&xadir->d_inode->i_mutex);
                 update_ctime(inode);
         }
 
         dput(dentry);
 out_dput:
+        mutex_unlock(&xadir->d_inode->i_mutex);
         dput(xadir);
         return err;
 }
@@ -687,20 +687,6 @@ out:
         return err;
 }
 
-/* Actual operations that are exported to VFS-land */
-struct xattr_handler *reiserfs_xattr_handlers[] = {
-        &reiserfs_xattr_user_handler,
-        &reiserfs_xattr_trusted_handler,
-#ifdef CONFIG_REISERFS_FS_SECURITY
-        &reiserfs_xattr_security_handler,
-#endif
-#ifdef CONFIG_REISERFS_FS_POSIX_ACL
-        &reiserfs_posix_acl_access_handler,
-        &reiserfs_posix_acl_default_handler,
-#endif
-        NULL
-};
-
 /*
  * In order to implement different sets of xattr operations for each xattr
  * prefix with the generic xattr API, a filesystem should create a
@@ -843,7 +829,7 @@ ssize_t reiserfs_listxattr(struct dentry * dentry, char *buffer, size_t size)
         if (!dentry->d_inode)
                 return -EINVAL;
 
-        if (!reiserfs_xattrs(dentry->d_sb) ||
+        if (!dentry->d_sb->s_xattr ||
             get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1)
                 return -EOPNOTSUPP;
 
@@ -885,42 +871,50 @@ static int reiserfs_check_acl(struct inode *inode, int mask)
         return error;
 }
 
-int reiserfs_permission(struct inode *inode, int mask)
-{
-        /*
-         * We don't do permission checks on the internal objects.
-         * Permissions are determined by the "owning" object.
-         */
-        if (IS_PRIVATE(inode))
-                return 0;
-        /*
-         * Stat data v1 doesn't support ACLs.
-         */
-        if (get_inode_sd_version(inode) == STAT_DATA_V1)
-                return generic_permission(inode, mask, NULL);
-        else
-                return generic_permission(inode, mask, reiserfs_check_acl);
-}
-
 static int create_privroot(struct dentry *dentry)
 {
         int err;
         struct inode *inode = dentry->d_parent->d_inode;
-        mutex_lock_nested(&inode->i_mutex, I_MUTEX_XATTR);
+        WARN_ON_ONCE(!mutex_is_locked(&inode->i_mutex));
+
         err = xattr_mkdir(inode, dentry, 0700);
-        mutex_unlock(&inode->i_mutex);
-        if (err) {
-                dput(dentry);
-                dentry = NULL;
+        if (err || !dentry->d_inode) {
+                reiserfs_warning(dentry->d_sb, "jdm-20006",
+                                 "xattrs/ACLs enabled and couldn't "
+                                 "find/create .reiserfs_priv. "
+                                 "Failing mount.");
+                return -EOPNOTSUPP;
         }
 
-        if (dentry && dentry->d_inode)
-                reiserfs_info(dentry->d_sb, "Created %s - reserved for xattr "
-                              "storage.\n", PRIVROOT_NAME);
+        dentry->d_inode->i_flags |= S_PRIVATE;
+        reiserfs_info(dentry->d_sb, "Created %s - reserved for xattr "
+                      "storage.\n", PRIVROOT_NAME);
 
-        return err;
+        return 0;
 }
 
+#else
+int __init reiserfs_xattr_register_handlers(void) { return 0; }
+void reiserfs_xattr_unregister_handlers(void) {}
+static int create_privroot(struct dentry *dentry) { return 0; }
+#endif
+
+/* Actual operations that are exported to VFS-land */
+struct xattr_handler *reiserfs_xattr_handlers[] = {
+#ifdef CONFIG_REISERFS_FS_XATTR
+        &reiserfs_xattr_user_handler,
+        &reiserfs_xattr_trusted_handler,
+#endif
+#ifdef CONFIG_REISERFS_FS_SECURITY
+        &reiserfs_xattr_security_handler,
+#endif
+#ifdef CONFIG_REISERFS_FS_POSIX_ACL
+        &reiserfs_posix_acl_access_handler,
+        &reiserfs_posix_acl_default_handler,
+#endif
+        NULL
+};
+
 static int xattr_mount_check(struct super_block *s)
 {
         /* We need generation numbers to ensure that the oid mapping is correct
@@ -940,21 +934,33 @@ static int xattr_mount_check(struct super_block *s)
         return 0;
 }
 
-#else
-int __init reiserfs_xattr_register_handlers(void) { return 0; }
-void reiserfs_xattr_unregister_handlers(void) {}
+int reiserfs_permission(struct inode *inode, int mask)
+{
+        /*
+         * We don't do permission checks on the internal objects.
+         * Permissions are determined by the "owning" object.
+         */
+        if (IS_PRIVATE(inode))
+                return 0;
+
+#ifdef CONFIG_REISERFS_FS_XATTR
+        /*
+         * Stat data v1 doesn't support ACLs.
+         */
+        if (get_inode_sd_version(inode) != STAT_DATA_V1)
+                return generic_permission(inode, mask, reiserfs_check_acl);
 #endif
+        return generic_permission(inode, mask, NULL);
+}
 
 /* This will catch lookups from the fs root to .reiserfs_priv */
 static int
 xattr_lookup_poison(struct dentry *dentry, struct qstr *q1, struct qstr *name)
 {
         struct dentry *priv_root = REISERFS_SB(dentry->d_sb)->priv_root;
-        if (name->len == priv_root->d_name.len &&
-            name->hash == priv_root->d_name.hash &&
-            !memcmp(name->name, priv_root->d_name.name, name->len)) {
+        if (container_of(q1, struct dentry, d_name) == priv_root)
                 return -ENOENT;
-        } else if (q1->len == name->len &&
+        if (q1->len == name->len &&
                    !memcmp(q1->name, name->name, name->len))
                 return 0;
         return 1;
@@ -964,73 +970,71 @@ static const struct dentry_operations xattr_lookup_poison_ops = {
         .d_compare = xattr_lookup_poison,
 };
 
+int reiserfs_lookup_privroot(struct super_block *s)
+{
+        struct dentry *dentry;
+        int err = 0;
+
+        /* If we don't have the privroot located yet - go find it */
+        mutex_lock(&s->s_root->d_inode->i_mutex);
+        dentry = lookup_one_len(PRIVROOT_NAME, s->s_root,
+                                strlen(PRIVROOT_NAME));
+        if (!IS_ERR(dentry)) {
+                REISERFS_SB(s)->priv_root = dentry;
+                s->s_root->d_op = &xattr_lookup_poison_ops;
+                if (dentry->d_inode)
+                        dentry->d_inode->i_flags |= S_PRIVATE;
+        } else
+                err = PTR_ERR(dentry);
+        mutex_unlock(&s->s_root->d_inode->i_mutex);
+
+        return err;
+}
+
 /* We need to take a copy of the mount flags since things like
  * MS_RDONLY don't get set until *after* we're called.
  * mount_flags != mount_options */
 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;
-#endif
 
-        /* If we don't have the privroot located yet - go find it */
-        if (!REISERFS_SB(s)->priv_root) {
-                struct dentry *dentry;
-                dentry = lookup_one_len(PRIVROOT_NAME, s->s_root,
-                                        strlen(PRIVROOT_NAME));
-                if (!IS_ERR(dentry)) {
-#ifdef CONFIG_REISERFS_FS_XATTR
-                        if (!(mount_flags & MS_RDONLY) && !dentry->d_inode)
-                                err = create_privroot(dentry);
-#endif
-                        if (!dentry->d_inode) {
-                                dput(dentry);
-                                dentry = NULL;
-                        }
-                } else
-                        err = PTR_ERR(dentry);
-
-                if (!err && dentry) {
-                        s->s_root->d_op = &xattr_lookup_poison_ops;
-                        dentry->d_inode->i_flags |= S_PRIVATE;
-                        REISERFS_SB(s)->priv_root = dentry;
-#ifdef CONFIG_REISERFS_FS_XATTR
-                /* xattrs are unavailable */
-                } else if (!(mount_flags & MS_RDONLY)) {
-                        /* If we're read-only it just means that the dir
-                         * hasn't been created. Not an error -- just no
-                         * xattrs on the fs. We'll check again if we
-                         * go read-write */
-                        reiserfs_warning(s, "jdm-20006",
-                                         "xattrs/ACLs enabled and couldn't "
-                                         "find/create .reiserfs_priv. "
-                                         "Failing mount.");
-                        err = -EOPNOTSUPP;
-#endif
-                }
+        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);
         }
 
-#ifdef CONFIG_REISERFS_FS_XATTR
-        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) {
                 clear_bit(REISERFS_XATTRS_USER, &(REISERFS_SB(s)->s_mount_opt));
                 clear_bit(REISERFS_POSIXACL, &(REISERFS_SB(s)->s_mount_opt));
         }
-#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;
-#endif
+        else
+                s->s_flags &= ~MS_POSIXACL;
 
         return err;
 }