reiserfs: use generic xattr handlers

Christoph Hellwig had asked me quite some time ago to port the reiserfs
xattrs to the generic xattr interface.

This patch replaces the reiserfs-specific xattr handling code with the
generic struct xattr_handler.

However, since reiserfs doesn't split the prefix and name when accessing
xattrs, it can't leverage generic_{set,get,list,remove}xattr without
needlessly reconstructing the name on the back end.

Update 7/26/07: Added missing dput() to deletion path.
Update 8/30/07: Added missing mark_inode_dirty when i_mode is used to
                represent an ACL and no previous ACL existed.

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

6 files changed, 249 insertions, 406 deletions

diff --git a/fs/reiserfs/super.c b/fs/reiserfs/super.c
index 6d10f81b4fc1..4a1e16362ebd 100644
--- a/fs/reiserfs/super.c
+++ b/fs/reiserfs/super.c
@@ -2263,9 +2263,6 @@ static int __init init_reiserfs_fs(void)
                 return ret;
         }
 
-        if ((ret = reiserfs_xattr_register_handlers()))
-                goto failed_reiserfs_xattr_register_handlers;
-
         reiserfs_proc_info_global_init();
         reiserfs_proc_register_global("version",
                                       reiserfs_global_version_in_proc);
@@ -2276,9 +2273,6 @@ static int __init init_reiserfs_fs(void)
                 return 0;
         }
 
-        reiserfs_xattr_unregister_handlers();
-
-      failed_reiserfs_xattr_register_handlers:
         reiserfs_proc_unregister_global("version");
         reiserfs_proc_info_global_done();
         destroy_inodecache();
@@ -2288,7 +2282,6 @@ static int __init init_reiserfs_fs(void)
 
 static void __exit exit_reiserfs_fs(void)
 {
-        reiserfs_xattr_unregister_handlers();
         reiserfs_proc_unregister_global("version");
         reiserfs_proc_info_global_done();
         unregister_filesystem(&reiserfs_fs_type);
diff --git a/fs/reiserfs/xattr.c b/fs/reiserfs/xattr.c
index 8d7e5d9ae17c..d3ce27436605 100644
--- a/fs/reiserfs/xattr.c
+++ b/fs/reiserfs/xattr.c
@@ -53,7 +53,6 @@
 #define PRIVROOT_NAME ".reiserfs_priv"
 #define XAROOT_NAME   "xattrs"
 
-static struct reiserfs_xattr_handler *find_xattr_handler_prefix(const char *);
 
 /* Helpers for inode ops. We do this so that we don't have all the VFS
  * overhead and also for proper i_mutex annotation.
@@ -110,7 +109,6 @@ static int xattr_rmdir(struct inode *dir, struct dentry *dentry)
         return error;
 }
 
-
 #define xattr_may_create(flags) (!flags || flags & XATTR_CREATE)
 
 /* Returns and possibly creates the xattr dir. */
@@ -339,14 +337,17 @@ int xattr_readdir(struct inode *inode, filldir_t filler, void *buf)
         return res;
 }
 
-/* expects xadir->d_inode->i_mutex to be locked */
+/* The following are side effects of other operations that aren't explicitly
+ * modifying extended attributes. This includes operations such as permissions
+ * or ownership changes, object deletions, etc. */
+
 static int
-__reiserfs_xattr_del(struct dentry *xadir, const char *name, int namelen)
+reiserfs_delete_xattrs_filler(void *buf, const char *name, int namelen,
+                              loff_t offset, u64 ino, unsigned int d_type)
 {
+        struct dentry *xadir = (struct dentry *)buf;
         struct dentry *dentry;
-        struct inode *dir = xadir->d_inode;
         int err = 0;
-        struct reiserfs_xattr_handler *xah;
 
         dentry = lookup_one_len(name, xadir, namelen);
         if (IS_ERR(dentry)) {
@@ -361,28 +362,7 @@ __reiserfs_xattr_del(struct dentry *xadir, const char *name, int namelen)
         if (S_ISDIR(dentry->d_inode->i_mode))
                 goto out_file;
 
-        if (!IS_PRIVATE(dentry->d_inode)) {
-                reiserfs_error(dir->i_sb, "jdm-20003",
-                               "OID %08x [%.*s/%.*s] doesn't have "
-                               "priv flag set [parent is %sset].",
-                               le32_to_cpu(INODE_PKEY(dentry->d_inode)->
-                                           k_objectid), xadir->d_name.len,
-                               xadir->d_name.name, namelen, name,
-                               IS_PRIVATE(xadir->d_inode) ? "" :
-                               "not ");
-                dput(dentry);
-                return -EIO;
-        }
-
-        /* Deletion pre-operation */
-        xah = find_xattr_handler_prefix(name);
-        if (xah && xah->del) {
-                err = xah->del(dentry->d_inode, name);
-                if (err)
-                        goto out;
-        }
-
-        err = xattr_unlink(dir, dentry);
+        err = xattr_unlink(xadir->d_inode, dentry);
 
 out_file:
         dput(dentry);
@@ -391,20 +371,6 @@ out:
         return err;
 }
 
-/* The following are side effects of other operations that aren't explicitly
- * modifying extended attributes. This includes operations such as permissions
- * or ownership changes, object deletions, etc. */
-
-static int
-reiserfs_delete_xattrs_filler(void *buf, const char *name, int namelen,
-                              loff_t offset, u64 ino, unsigned int d_type)
-{
-        struct dentry *xadir = (struct dentry *)buf;
-
-        return __reiserfs_xattr_del(xadir, name, namelen);
-
-}
-
 /* This is called w/ inode->i_mutex downed */
 int reiserfs_delete_xattrs(struct inode *inode)
 {
@@ -541,14 +507,11 @@ out:
 }
 
 #ifdef CONFIG_REISERFS_FS_XATTR
-static struct reiserfs_xattr_handler *find_xattr_handler_prefix(const char
-                                                                *prefix);
-
 /* Returns a dentry corresponding to a specific extended attribute file
  * for the inode. If flags allow, the file is created. Otherwise, a
  * valid or negative dentry, or an error is returned. */
-static struct dentry *get_xa_file_dentry(const struct inode *inode,
-                                         const char *name, int flags)
+static struct dentry *xattr_lookup(struct inode *inode, const char *name,
+                                    int flags)
 {
         struct dentry *xadir, *xafile;
         int err = 0;
@@ -623,6 +586,45 @@ int reiserfs_commit_write(struct file *f, struct page *page,
 int reiserfs_prepare_write(struct file *f, struct page *page,
                            unsigned from, unsigned to);
 
+static void update_ctime(struct inode *inode)
+{
+        struct timespec now = current_fs_time(inode->i_sb);
+        if (hlist_unhashed(&inode->i_hash) || !inode->i_nlink ||
+            timespec_equal(&inode->i_ctime, &now))
+                return;
+
+        inode->i_ctime = CURRENT_TIME_SEC;
+        mark_inode_dirty(inode);
+}
+
+static int lookup_and_delete_xattr(struct inode *inode, const char *name)
+{
+        int err = 0;
+        struct dentry *dentry, *xadir;
+
+        xadir = open_xa_dir(inode, XATTR_REPLACE);
+        if (IS_ERR(xadir))
+                return PTR_ERR(xadir);
+
+        dentry = lookup_one_len(name, xadir, strlen(name));
+        if (IS_ERR(dentry)) {
+                err = PTR_ERR(dentry);
+                goto out_dput;
+        }
+
+        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:
+        dput(xadir);
+        return err;
+}
+
 
 /* Generic extended attribute operations that can be used by xa plugins */
 
@@ -630,8 +632,8 @@ int reiserfs_prepare_write(struct file *f, struct page *page,
  * inode->i_mutex: down
  */
 int
-reiserfs_xattr_set(struct inode *inode, const char *name, const void *buffer,
-                   size_t buffer_size, int flags)
+__reiserfs_xattr_set(struct inode *inode, const char *name, const void *buffer,
+                     size_t buffer_size, int flags)
 {
         int err = 0;
         struct dentry *dentry;
@@ -639,37 +641,22 @@ reiserfs_xattr_set(struct inode *inode, const char *name, const void *buffer,
         char *data;
         size_t file_pos = 0;
         size_t buffer_pos = 0;
-        struct iattr newattrs;
+        size_t new_size;
         __u32 xahash = 0;
 
         if (get_inode_sd_version(inode) == STAT_DATA_V1)
                 return -EOPNOTSUPP;
 
         if (!buffer)
-                return reiserfs_xattr_del(inode, name);
+                return lookup_and_delete_xattr(inode, name);
 
-        dentry = get_xa_file_dentry(inode, name, flags);
-        if (IS_ERR(dentry)) {
-                err = PTR_ERR(dentry);
-                goto out;
-        }
+        dentry = xattr_lookup(inode, name, flags);
+        if (IS_ERR(dentry))
+                return PTR_ERR(dentry);
 
         down_write(&REISERFS_I(inode)->i_xattr_sem);
 
         xahash = xattr_hash(buffer, buffer_size);
-
-        /* Resize it so we're ok to write there */
-        newattrs.ia_size = buffer_size;
-        newattrs.ia_ctime = current_fs_time(inode->i_sb);
-        newattrs.ia_valid = ATTR_SIZE | ATTR_CTIME;
-        mutex_lock_nested(&dentry->d_inode->i_mutex, I_MUTEX_XATTR);
-        down_write(&dentry->d_inode->i_alloc_sem);
-        err = reiserfs_setattr(dentry, &newattrs);
-        up_write(&dentry->d_inode->i_alloc_sem);
-        mutex_unlock(&dentry->d_inode->i_mutex);
-        if (err)
-                goto out_filp;
-
         while (buffer_pos < buffer_size || buffer_pos == 0) {
                 size_t chunk;
                 size_t skip = 0;
@@ -682,7 +669,7 @@ reiserfs_xattr_set(struct inode *inode, const char *name, const void *buffer,
                 page = reiserfs_get_page(dentry->d_inode, file_pos);
                 if (IS_ERR(page)) {
                         err = PTR_ERR(page);
-                        goto out_filp;
+                        goto out_unlock;
                 }
 
                 lock_page(page);
@@ -716,20 +703,33 @@ reiserfs_xattr_set(struct inode *inode, const char *name, const void *buffer,
                         break;
         }
 
-        /* We can't mark the inode dirty if it's not hashed. This is the case
-         * when we're inheriting the default ACL. If we dirty it, the inode
-         * gets marked dirty, but won't (ever) make it onto the dirty list until
-         * it's synced explicitly to clear I_DIRTY. This is bad. */
-        if (!hlist_unhashed(&inode->i_hash)) {
-                inode->i_ctime = CURRENT_TIME_SEC;
-                mark_inode_dirty(inode);
-        }
-
-      out_filp:
+        new_size = buffer_size + sizeof(struct reiserfs_xattr_header);
+        if (!err && new_size < i_size_read(dentry->d_inode)) {
+                struct iattr newattrs = {
+                        .ia_ctime = current_fs_time(inode->i_sb),
+                        .ia_size = buffer_size,
+                        .ia_valid = ATTR_SIZE | ATTR_CTIME,
+                };
+                mutex_lock_nested(&dentry->d_inode->i_mutex, I_MUTEX_XATTR);
+                down_write(&dentry->d_inode->i_alloc_sem);
+                err = reiserfs_setattr(dentry, &newattrs);
+                up_write(&dentry->d_inode->i_alloc_sem);
+                mutex_unlock(&dentry->d_inode->i_mutex);
+        } else
+                update_ctime(inode);
+out_unlock:
         up_write(&REISERFS_I(inode)->i_xattr_sem);
         dput(dentry);
+        return err;
+}
 
-      out:
+int
+reiserfs_xattr_set(struct inode *inode, const char *name, const void *buffer,
+                     size_t buffer_size, int flags)
+{
+        int err = __reiserfs_xattr_set(inode, name, buffer, buffer_size, flags);
+        if (err == -ENODATA)
+                err = 0;
         return err;
 }
 
@@ -737,7 +737,7 @@ reiserfs_xattr_set(struct inode *inode, const char *name, const void *buffer,
  * inode->i_mutex: down
  */
 int
-reiserfs_xattr_get(const struct inode *inode, const char *name, void *buffer,
+reiserfs_xattr_get(struct inode *inode, const char *name, void *buffer,
                    size_t buffer_size)
 {
         ssize_t err = 0;
@@ -756,7 +756,7 @@ reiserfs_xattr_get(const struct inode *inode, const char *name, void *buffer,
         if (get_inode_sd_version(inode) == STAT_DATA_V1)
                 return -EOPNOTSUPP;
 
-        dentry = get_xa_file_dentry(inode, name, XATTR_REPLACE);
+        dentry = xattr_lookup(inode, name, XATTR_REPLACE);
         if (IS_ERR(dentry)) {
                 err = PTR_ERR(dentry);
                 goto out;
@@ -837,32 +837,53 @@ out:
         return err;
 }
 
-int reiserfs_xattr_del(struct inode *inode, const char *name)
-{
-        struct dentry *dir;
-        int 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
+};
 
-        dir = open_xa_dir(inode, XATTR_REPLACE);
-        if (IS_ERR(dir)) {
-                err = PTR_ERR(dir);
-                goto out;
-        }
+/*
+ * In order to implement different sets of xattr operations for each xattr
+ * prefix with the generic xattr API, a filesystem should create a
+ * null-terminated array of struct xattr_handler (one for each prefix) and
+ * hang a pointer to it off of the s_xattr field of the superblock.
+ *
+ * The generic_fooxattr() functions will use this list to dispatch xattr
+ * operations to the correct xattr_handler.
+ */
+#define for_each_xattr_handler(handlers, handler)               \
+                for ((handler) = *(handlers)++;                 \
+                        (handler) != NULL;                      \
+                        (handler) = *(handlers)++)
 
-        mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_XATTR);
-        err = __reiserfs_xattr_del(dir, name, strlen(name));
-        mutex_unlock(&dir->d_inode->i_mutex);
-        dput(dir);
+/* This is the implementation for the xattr plugin infrastructure */
+static inline struct xattr_handler *
+find_xattr_handler_prefix(struct xattr_handler **handlers,
+                           const char *name)
+{
+        struct xattr_handler *xah;
 
-        if (!err) {
-                inode->i_ctime = CURRENT_TIME_SEC;
-                mark_inode_dirty(inode);
+        if (!handlers)
+                return NULL;
+
+        for_each_xattr_handler(handlers, xah) {
+                if (strncmp(xah->prefix, name, strlen(xah->prefix)) == 0)
+                        break;
         }
 
-      out:
-        return err;
+        return xah;
 }
 
-/* Actual operations that are exported to VFS-land */
+
 /*
  * Inode operation getxattr()
  */
@@ -870,15 +891,15 @@ ssize_t
 reiserfs_getxattr(struct dentry * dentry, const char *name, void *buffer,
                   size_t size)
 {
-        struct reiserfs_xattr_handler *xah = find_xattr_handler_prefix(name);
-        int err;
+        struct inode *inode = dentry->d_inode;
+        struct xattr_handler *handler;
 
-        if (!xah || !reiserfs_xattrs(dentry->d_sb) ||
-            get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1)
+        handler = find_xattr_handler_prefix(inode->i_sb->s_xattr, name);
+
+        if (!handler || get_inode_sd_version(inode) == STAT_DATA_V1)
                 return -EOPNOTSUPP;
 
-        err = xah->get(dentry->d_inode, name, buffer, size);
-        return err;
+        return handler->get(inode, name, buffer, size);
 }
 
 /*
@@ -890,15 +911,15 @@ int
 reiserfs_setxattr(struct dentry *dentry, const char *name, const void *value,
                   size_t size, int flags)
 {
-        struct reiserfs_xattr_handler *xah = find_xattr_handler_prefix(name);
-        int err;
+        struct inode *inode = dentry->d_inode;
+        struct xattr_handler *handler;
 
-        if (!xah || !reiserfs_xattrs(dentry->d_sb) ||
-            get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1)
+        handler = find_xattr_handler_prefix(inode->i_sb->s_xattr, name);
+
+        if (!handler || get_inode_sd_version(inode) == STAT_DATA_V1)
                 return -EOPNOTSUPP;
 
-        err = xah->set(dentry->d_inode, name, value, size, flags);
-        return err;
+        return handler->set(inode, name, value, size, flags);
 }
 
 /*
@@ -908,71 +929,65 @@ reiserfs_setxattr(struct dentry *dentry, const char *name, const void *value,
  */
 int reiserfs_removexattr(struct dentry *dentry, const char *name)
 {
-        int err;
-        struct reiserfs_xattr_handler *xah = find_xattr_handler_prefix(name);
+        struct inode *inode = dentry->d_inode;
+        struct xattr_handler *handler;
+        handler = find_xattr_handler_prefix(inode->i_sb->s_xattr, name);
 
-        if (!xah || !reiserfs_xattrs(dentry->d_sb) ||
-            get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1)
+        if (!handler || get_inode_sd_version(inode) == STAT_DATA_V1)
                 return -EOPNOTSUPP;
 
-        err = reiserfs_xattr_del(dentry->d_inode, name);
-
-        dentry->d_inode->i_ctime = CURRENT_TIME_SEC;
-        mark_inode_dirty(dentry->d_inode);
-
-        return err;
+        return handler->set(inode, name, NULL, 0, XATTR_REPLACE);
 }
 
-/* This is what filldir will use:
- * r_pos will always contain the amount of space required for the entire
- * list. If r_pos becomes larger than r_size, we need more space and we
- * return an error indicating this. If r_pos is less than r_size, then we've
- * filled the buffer successfully and we return success */
-struct reiserfs_listxattr_buf {
-        int r_pos;
-        int r_size;
-        char *r_buf;
-        struct inode *r_inode;
+struct listxattr_buf {
+        size_t size;
+        size_t pos;
+        char *buf;
+        struct inode *inode;
 };
 
-static int
-reiserfs_listxattr_filler(void *buf, const char *name, int namelen,
-                          loff_t offset, u64 ino, unsigned int d_type)
+static int listxattr_filler(void *buf, const char *name, int namelen,
+                            loff_t offset, u64 ino, unsigned int d_type)
 {
-        struct reiserfs_listxattr_buf *b = (struct reiserfs_listxattr_buf *)buf;
-        int len = 0;
-        if (name[0] != '.'
-            || (namelen != 1 && (name[1] != '.' || namelen != 2))) {
-                struct reiserfs_xattr_handler *xah =
-                    find_xattr_handler_prefix(name);
-                if (!xah)
-                        return 0;       /* Unsupported xattr name, skip it */
-
-                /* We call ->list() twice because the operation isn't required to just
-                 * return the name back - we want to make sure we have enough space */
-                len += xah->list(b->r_inode, name, namelen, NULL);
-
-                if (len) {
-                        if (b->r_pos + len + 1 <= b->r_size) {
-                                char *p = b->r_buf + b->r_pos;
-                                p += xah->list(b->r_inode, name, namelen, p);
-                                *p++ = '\0';
-                        }
-                        b->r_pos += len + 1;
+        struct listxattr_buf *b = (struct listxattr_buf *)buf;
+        size_t size;
+        if (name[0] != '.' ||
+            (namelen != 1 && (name[1] != '.' || namelen != 2))) {
+                struct xattr_handler *handler;
+                handler = find_xattr_handler_prefix(b->inode->i_sb->s_xattr,
+                                                    name);
+                if (!handler)   /* Unsupported xattr name */
+                        return 0;
+                if (b->buf) {
+                        size = handler->list(b->inode, b->buf + b->pos,
+                                         b->size, name, namelen);
+                        if (size > b->size)
+                                return -ERANGE;
+                } else {
+                        size = handler->list(b->inode, NULL, 0, name, namelen);
                 }
-        }
 
+                b->pos += size;
+        }
         return 0;
 }
 
 /*
  * Inode operation listxattr()
+ *
+ * We totally ignore the generic listxattr here because it would be stupid
+ * not to. Since the xattrs are organized in a directory, we can just
+ * readdir to find them.
  */
 ssize_t reiserfs_listxattr(struct dentry * dentry, char *buffer, size_t size)
 {
         struct dentry *dir;
         int err = 0;
-        struct reiserfs_listxattr_buf buf;
+        struct listxattr_buf buf = {
+                .inode = dentry->d_inode,
+                .buf = buffer,
+                .size = buffer ? size : 0,
+        };
 
         if (!dentry->d_inode)
                 return -EINVAL;
@@ -985,120 +1000,22 @@ ssize_t reiserfs_listxattr(struct dentry * dentry, char *buffer, size_t size)
         if (IS_ERR(dir)) {
                 err = PTR_ERR(dir);
                 if (err == -ENODATA)
-                        err = 0;        /* Not an error if there aren't any xattrs */
+                        err = 0;  /* Not an error if there aren't any xattrs */
                 goto out;
         }
 
-        buf.r_buf = buffer;
-        buf.r_size = buffer ? size : 0;
-        buf.r_pos = 0;
-        buf.r_inode = dentry->d_inode;
-
         mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_XATTR);
-        err = xattr_readdir(dir->d_inode, reiserfs_listxattr_filler, &buf);
+        err = xattr_readdir(dir->d_inode, listxattr_filler, &buf);
         mutex_unlock(&dir->d_inode->i_mutex);
 
-        if (!err) {
-                if (buf.r_pos > buf.r_size && buffer != NULL)
-                        err = -ERANGE;
-                else
-                        err = buf.r_pos;
-        }
+        if (!err)
+                err = buf.pos;
 
         dput(dir);
 out:
         return err;
 }
 
-/* This is the implementation for the xattr plugin infrastructure */
-static LIST_HEAD(xattr_handlers);
-static DEFINE_RWLOCK(handler_lock);
-
-static struct reiserfs_xattr_handler *find_xattr_handler_prefix(const char
-                                                                *prefix)
-{
-        struct reiserfs_xattr_handler *xah = NULL;
-        struct list_head *p;
-
-        read_lock(&handler_lock);
-        list_for_each(p, &xattr_handlers) {
-                xah = list_entry(p, struct reiserfs_xattr_handler, handlers);
-                if (strncmp(xah->prefix, prefix, strlen(xah->prefix)) == 0)
-                        break;
-                xah = NULL;
-        }
-
-        read_unlock(&handler_lock);
-        return xah;
-}
-
-static void __unregister_handlers(void)
-{
-        struct reiserfs_xattr_handler *xah;
-        struct list_head *p, *tmp;
-
-        list_for_each_safe(p, tmp, &xattr_handlers) {
-                xah = list_entry(p, struct reiserfs_xattr_handler, handlers);
-                if (xah->exit)
-                        xah->exit();
-
-                list_del_init(p);
-        }
-        INIT_LIST_HEAD(&xattr_handlers);
-}
-
-int __init reiserfs_xattr_register_handlers(void)
-{
-        int err = 0;
-        struct reiserfs_xattr_handler *xah;
-        struct list_head *p;
-
-        write_lock(&handler_lock);
-
-        /* If we're already initialized, nothing to do */
-        if (!list_empty(&xattr_handlers)) {
-                write_unlock(&handler_lock);
-                return 0;
-        }
-
-        /* Add the handlers */
-        list_add_tail(&user_handler.handlers, &xattr_handlers);
-        list_add_tail(&trusted_handler.handlers, &xattr_handlers);
-#ifdef CONFIG_REISERFS_FS_SECURITY
-        list_add_tail(&security_handler.handlers, &xattr_handlers);
-#endif
-#ifdef CONFIG_REISERFS_FS_POSIX_ACL
-        list_add_tail(&posix_acl_access_handler.handlers, &xattr_handlers);
-        list_add_tail(&posix_acl_default_handler.handlers, &xattr_handlers);
-#endif
-
-        /* Run initializers, if available */
-        list_for_each(p, &xattr_handlers) {
-                xah = list_entry(p, struct reiserfs_xattr_handler, handlers);
-                if (xah->init) {
-                        err = xah->init();
-                        if (err) {
-                                list_del_init(p);
-                                break;
-                        }
-                }
-        }
-
-        /* Clean up other handlers, if any failed */
-        if (err)
-                __unregister_handlers();
-
-        write_unlock(&handler_lock);
-        return err;
-}
-
-void reiserfs_xattr_unregister_handlers(void)
-{
-        write_lock(&handler_lock);
-        __unregister_handlers();
-        write_unlock(&handler_lock);
-}
-
 static int reiserfs_check_acl(struct inode *inode, int mask)
 {
         struct posix_acl *acl;
@@ -1157,20 +1074,16 @@ static int xattr_mount_check(struct super_block *s)
 {
         /* We need generation numbers to ensure that the oid mapping is correct
          * v3.5 filesystems don't have them. */
-        if (!old_format_only(s)) {
-                set_bit(REISERFS_XATTRS, &(REISERFS_SB(s)->s_mount_opt));
-        } else if (reiserfs_xattrs_optional(s)) {
-                /* Old format filesystem, but optional xattrs have been enabled
-                 * at mount time. Error out. */
-                reiserfs_warning(s, "jdm-20005",
-                                 "xattrs/ACLs not supported on pre v3.6 "
-                                 "format filesystem. Failing mount.");
-                return -EOPNOTSUPP;
-        } else {
-                /* Old format filesystem, but no optional xattrs have
-                 * been enabled. This means we silently disable xattrs
-                 * on the filesystem. */
-                clear_bit(REISERFS_XATTRS, &(REISERFS_SB(s)->s_mount_opt));
+        if (old_format_only(s)) {
+                if (reiserfs_xattrs_optional(s)) {
+                        /* Old format filesystem, but optional xattrs have
+                         * been enabled. Error out. */
+                        reiserfs_warning(s, "jdm-2005",
+                                         "xattrs/ACLs not supported "
+                                         "on pre-v3.6 format filesystems. "
+                                         "Failing mount.");
+                        return -EOPNOTSUPP;
+                }
         }
 
         return 0;
@@ -1251,9 +1164,11 @@ int reiserfs_xattr_init(struct super_block *s, int mount_flags)
         }
 
 #ifdef CONFIG_REISERFS_FS_XATTR
+        if (!err)
+                s->s_xattr = reiserfs_xattr_handlers;
+
 error:
         if (err) {
-                clear_bit(REISERFS_XATTRS, &(REISERFS_SB(s)->s_mount_opt));
                 clear_bit(REISERFS_XATTRS_USER, &(REISERFS_SB(s)->s_mount_opt));
                 clear_bit(REISERFS_POSIXACL, &(REISERFS_SB(s)->s_mount_opt));
         }
diff --git a/fs/reiserfs/xattr_acl.c b/fs/reiserfs/xattr_acl.c
index d3ce6ee9b262..bfecf7553002 100644
--- a/fs/reiserfs/xattr_acl.c
+++ b/fs/reiserfs/xattr_acl.c
@@ -271,7 +271,7 @@ reiserfs_set_acl(struct inode *inode, int type, struct posix_acl *acl)
         char *name;
         void *value = NULL;
         struct posix_acl **p_acl;
-        size_t size;
+        size_t size = 0;
         int error;
         struct reiserfs_inode_info *reiserfs_i = REISERFS_I(inode);
 
@@ -308,16 +308,21 @@ reiserfs_set_acl(struct inode *inode, int type, struct posix_acl *acl)
                 value = posix_acl_to_disk(acl, &size);
                 if (IS_ERR(value))
                         return (int)PTR_ERR(value);
-                error = reiserfs_xattr_set(inode, name, value, size, 0);
-        } else {
-                error = reiserfs_xattr_del(inode, name);
-                if (error == -ENODATA) {
-                        /* This may seem odd here, but it means that the ACL was set
-                         * with a value representable with mode bits. If there was
-                         * an ACL before, reiserfs_xattr_del already dirtied the inode.
-                         */
+        }
+
+        error = __reiserfs_xattr_set(inode, name, value, size, 0);
+
+        /*
+         * Ensure that the inode gets dirtied if we're only using
+         * the mode bits and an old ACL didn't exist. We don't need
+         * to check if the inode is hashed here since we won't get
+         * called by reiserfs_inherit_default_acl().
+         */
+        if (error == -ENODATA) {
+                error = 0;
+                if (type == ACL_TYPE_ACCESS) {
+                        inode->i_ctime = CURRENT_TIME_SEC;
                         mark_inode_dirty(inode);
-                        error = 0;
                 }
         }
 
@@ -474,33 +479,22 @@ posix_acl_access_set(struct inode *inode, const char *name,
         return xattr_set_acl(inode, ACL_TYPE_ACCESS, value, size);
 }
 
-static int posix_acl_access_del(struct inode *inode, const char *name)
-{
-        struct reiserfs_inode_info *reiserfs_i = REISERFS_I(inode);
-        if (strlen(name) != sizeof(POSIX_ACL_XATTR_ACCESS) - 1)
-                return -EINVAL;
-        iset_acl(inode, &reiserfs_i->i_acl_access, ERR_PTR(-ENODATA));
-        return 0;
-}
-
-static int
-posix_acl_access_list(struct inode *inode, const char *name, int namelen,
-                      char *out)
+static size_t posix_acl_access_list(struct inode *inode, char *list,
+                                    size_t list_size, const char *name,
+                                    size_t name_len)
 {
-        int len = namelen;
+        const size_t size = sizeof(POSIX_ACL_XATTR_ACCESS);
         if (!reiserfs_posixacl(inode->i_sb))
                 return 0;
-        if (out)
-                memcpy(out, name, len);
-
-        return len;
+        if (list && size <= list_size)
+                memcpy(list, POSIX_ACL_XATTR_ACCESS, size);
+        return size;
 }
 
-struct reiserfs_xattr_handler posix_acl_access_handler = {
+struct xattr_handler reiserfs_posix_acl_access_handler = {
         .prefix = POSIX_ACL_XATTR_ACCESS,
         .get = posix_acl_access_get,
         .set = posix_acl_access_set,
-        .del = posix_acl_access_del,
         .list = posix_acl_access_list,
 };
 
@@ -522,32 +516,21 @@ posix_acl_default_set(struct inode *inode, const char *name,
         return xattr_set_acl(inode, ACL_TYPE_DEFAULT, value, size);
 }
 
-static int posix_acl_default_del(struct inode *inode, const char *name)
+static size_t posix_acl_default_list(struct inode *inode, char *list,
+                                     size_t list_size, const char *name,
+                                     size_t name_len)
 {
-        struct reiserfs_inode_info *reiserfs_i = REISERFS_I(inode);
-        if (strlen(name) != sizeof(POSIX_ACL_XATTR_DEFAULT) - 1)
-                return -EINVAL;
-        iset_acl(inode, &reiserfs_i->i_acl_default, ERR_PTR(-ENODATA));
-        return 0;
-}
-
-static int
-posix_acl_default_list(struct inode *inode, const char *name, int namelen,
-                       char *out)
-{
-        int len = namelen;
+        const size_t size = sizeof(POSIX_ACL_XATTR_DEFAULT);
         if (!reiserfs_posixacl(inode->i_sb))
                 return 0;
-        if (out)
-                memcpy(out, name, len);
-
-        return len;
+        if (list && size <= list_size)
+                memcpy(list, POSIX_ACL_XATTR_DEFAULT, size);
+        return size;
 }
 
-struct reiserfs_xattr_handler posix_acl_default_handler = {
+struct xattr_handler reiserfs_posix_acl_default_handler = {
         .prefix = POSIX_ACL_XATTR_DEFAULT,
         .get = posix_acl_default_get,
         .set = posix_acl_default_set,
-        .del = posix_acl_default_del,
         .list = posix_acl_default_list,
 };
diff --git a/fs/reiserfs/xattr_security.c b/fs/reiserfs/xattr_security.c
index 1958b361c35d..2aacf1fe69fd 100644
--- a/fs/reiserfs/xattr_security.c
+++ b/fs/reiserfs/xattr_security.c
@@ -31,35 +31,25 @@ security_set(struct inode *inode, const char *name, const void *buffer,
         return reiserfs_xattr_set(inode, name, buffer, size, flags);
 }
 
-static int security_del(struct inode *inode, const char *name)
+static size_t security_list(struct inode *inode, char *list, size_t list_len,
+                            const char *name, size_t namelen)
 {
-        if (strlen(name) < sizeof(XATTR_SECURITY_PREFIX))
-                return -EINVAL;
-
-        if (IS_PRIVATE(inode))
-                return -EPERM;
-
-        return 0;
-}
-
-static int
-security_list(struct inode *inode, const char *name, int namelen, char *out)
-{
-        int len = namelen;
+        const size_t len = namelen + 1;
 
         if (IS_PRIVATE(inode))
                 return 0;
 
-        if (out)
-                memcpy(out, name, len);
+        if (list && len <= list_len) {
+                memcpy(list, name, namelen);
+                list[namelen] = '\0';
+        }
 
         return len;
 }
 
-struct reiserfs_xattr_handler security_handler = {
+struct xattr_handler reiserfs_xattr_security_handler = {
         .prefix = XATTR_SECURITY_PREFIX,
         .get = security_get,
         .set = security_set,
-        .del = security_del,
         .list = security_list,
 };
diff --git a/fs/reiserfs/xattr_trusted.c b/fs/reiserfs/xattr_trusted.c
index 076ad388d489..a865042f75e2 100644
--- a/fs/reiserfs/xattr_trusted.c
+++ b/fs/reiserfs/xattr_trusted.c
@@ -13,10 +13,7 @@ trusted_get(struct inode *inode, const char *name, void *buffer, size_t size)
         if (strlen(name) < sizeof(XATTR_TRUSTED_PREFIX))
                 return -EINVAL;
 
-        if (!reiserfs_xattrs(inode->i_sb))
-                return -EOPNOTSUPP;
-
-        if (!(capable(CAP_SYS_ADMIN) || IS_PRIVATE(inode)))
+        if (!capable(CAP_SYS_ADMIN) || IS_PRIVATE(inode))
                 return -EPERM;
 
         return reiserfs_xattr_get(inode, name, buffer, size);
@@ -29,50 +26,30 @@ trusted_set(struct inode *inode, const char *name, const void *buffer,
         if (strlen(name) < sizeof(XATTR_TRUSTED_PREFIX))
                 return -EINVAL;
 
-        if (!reiserfs_xattrs(inode->i_sb))
-                return -EOPNOTSUPP;
-
-        if (!(capable(CAP_SYS_ADMIN) || IS_PRIVATE(inode)))
+        if (!capable(CAP_SYS_ADMIN) || IS_PRIVATE(inode))
                 return -EPERM;
 
         return reiserfs_xattr_set(inode, name, buffer, size, flags);
 }
 
-static int trusted_del(struct inode *inode, const char *name)
+static size_t trusted_list(struct inode *inode, char *list, size_t list_size,
+                           const char *name, size_t name_len)
 {
-        if (strlen(name) < sizeof(XATTR_TRUSTED_PREFIX))
-                return -EINVAL;
+        const size_t len = name_len + 1;
 
-        if (!reiserfs_xattrs(inode->i_sb))
-                return -EOPNOTSUPP;
-
-        if (!(capable(CAP_SYS_ADMIN) || IS_PRIVATE(inode)))
-                return -EPERM;
-
-        return 0;
-}
-
-static int
-trusted_list(struct inode *inode, const char *name, int namelen, char *out)
-{
-        int len = namelen;
-
-        if (!reiserfs_xattrs(inode->i_sb))
+        if (!capable(CAP_SYS_ADMIN) || IS_PRIVATE(inode))
                 return 0;
 
-        if (!(capable(CAP_SYS_ADMIN) || IS_PRIVATE(inode)))
-                return 0;
-
-        if (out)
-                memcpy(out, name, len);
-
+        if (list && len <= list_size) {
+                memcpy(list, name, name_len);
+                list[name_len] = '\0';
+        }
         return len;
 }
 
-struct reiserfs_xattr_handler trusted_handler = {
+struct xattr_handler reiserfs_xattr_trusted_handler = {
         .prefix = XATTR_TRUSTED_PREFIX,
         .get = trusted_get,
         .set = trusted_set,
-        .del = trusted_del,
         .list = trusted_list,
 };
diff --git a/fs/reiserfs/xattr_user.c b/fs/reiserfs/xattr_user.c
index 1384efcb938e..e3238dc4f3db 100644
--- a/fs/reiserfs/xattr_user.c
+++ b/fs/reiserfs/xattr_user.c
@@ -6,10 +6,6 @@
 #include <linux/reiserfs_xattr.h>
 #include <asm/uaccess.h>
 
-#ifdef CONFIG_REISERFS_FS_POSIX_ACL
-# include <linux/reiserfs_acl.h>
-#endif
-
 static int
 user_get(struct inode *inode, const char *name, void *buffer, size_t size)
 {
@@ -25,7 +21,6 @@ static int
 user_set(struct inode *inode, const char *name, const void *buffer,
          size_t size, int flags)
 {
-
         if (strlen(name) < sizeof(XATTR_USER_PREFIX))
                 return -EINVAL;
 
@@ -34,33 +29,23 @@ user_set(struct inode *inode, const char *name, const void *buffer,
         return reiserfs_xattr_set(inode, name, buffer, size, flags);
 }
 
-static int user_del(struct inode *inode, const char *name)
+static size_t user_list(struct inode *inode, char *list, size_t list_size,
+                        const char *name, size_t name_len)
 {
-        if (strlen(name) < sizeof(XATTR_USER_PREFIX))
-                return -EINVAL;
-
-        if (!reiserfs_xattrs_user(inode->i_sb))
-                return -EOPNOTSUPP;
-        return 0;
-}
+        const size_t len = name_len + 1;
 
-static int
-user_list(struct inode *inode, const char *name, int namelen, char *out)
-{
-        int len = namelen;
         if (!reiserfs_xattrs_user(inode->i_sb))
                 return 0;
-
-        if (out)
-                memcpy(out, name, len);
-
+        if (list && len <= list_size) {
+                memcpy(list, name, name_len);
+                list[name_len] = '\0';
+        }
         return len;
 }
 
-struct reiserfs_xattr_handler user_handler = {
+struct xattr_handler reiserfs_xattr_user_handler = {
         .prefix = XATTR_USER_PREFIX,
         .get = user_get,
         .set = user_set,
-        .del = user_del,
         .list = user_list,
 };