8 files changed, 41 insertions, 64 deletions

diff --git a/fs/btrfs/delayed-inode.c b/fs/btrfs/delayed-inode.c
index c7ddf8a01c54..9c1eccc2c503 100644
--- a/fs/btrfs/delayed-inode.c
+++ b/fs/btrfs/delayed-inode.c
@@ -1719,7 +1719,7 @@ int btrfs_fill_inode(struct inode *inode, u32 *rdev)
         inode->i_gid = btrfs_stack_inode_gid(inode_item);
         btrfs_i_size_write(inode, btrfs_stack_inode_size(inode_item));
         inode->i_mode = btrfs_stack_inode_mode(inode_item);
-        inode->i_nlink = btrfs_stack_inode_nlink(inode_item);
+        set_nlink(inode, btrfs_stack_inode_nlink(inode_item));
         inode_set_bytes(inode, btrfs_stack_inode_nbytes(inode_item));
         BTRFS_I(inode)->generation = btrfs_stack_inode_generation(inode_item);
         BTRFS_I(inode)->sequence = btrfs_stack_inode_sequence(inode_item);
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 3f9d5551e582..f44b3928dc2d 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -2007,7 +2007,7 @@ struct btrfs_root *open_ctree(struct super_block *sb,
         sb->s_bdi = &fs_info->bdi;
 
         fs_info->btree_inode->i_ino = BTRFS_BTREE_INODE_OBJECTID;
-        fs_info->btree_inode->i_nlink = 1;
+        set_nlink(fs_info->btree_inode, 1);
         /*
          * we set the i_size on the btree inode to the max possible int.
          * the real end of the address space is determined by all of
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 8603ee4e3dfd..f5fbe576d2ba 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -3416,7 +3416,8 @@ static int shrink_delalloc(struct btrfs_root *root, u64 to_reclaim,
                 smp_mb();
                 nr_pages = min_t(unsigned long, nr_pages,
                        root->fs_info->delalloc_bytes >> PAGE_CACHE_SHIFT);
-                writeback_inodes_sb_nr_if_idle(root->fs_info->sb, nr_pages);
+                writeback_inodes_sb_nr_if_idle(root->fs_info->sb, nr_pages,
+                                                WB_REASON_FS_FREE_SPACE);
 
                 spin_lock(&space_info->lock);
                 if (reserved > space_info->bytes_may_use)
diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index cc7492c823f3..97fbe939c050 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -1167,6 +1167,8 @@ static noinline ssize_t __btrfs_buffered_write(struct file *file,
         nrptrs = min((iov_iter_count(i) + PAGE_CACHE_SIZE - 1) /
                      PAGE_CACHE_SIZE, PAGE_CACHE_SIZE /
                      (sizeof(struct page *)));
+        nrptrs = min(nrptrs, current->nr_dirtied_pause - current->nr_dirtied);
+        nrptrs = max(nrptrs, 8);
         pages = kmalloc(nrptrs * sizeof(struct page *), GFP_KERNEL);
         if (!pages)
                 return -ENOMEM;
@@ -1836,7 +1838,7 @@ static loff_t btrfs_file_llseek(struct file *file, loff_t offset, int origin)
         switch (origin) {
         case SEEK_END:
         case SEEK_CUR:
-                offset = generic_file_llseek_unlocked(file, offset, origin);
+                offset = generic_file_llseek(file, offset, origin);
                 goto out;
         case SEEK_DATA:
         case SEEK_HOLE:
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 13b0542015ff..fd1a06df5bc6 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -2358,7 +2358,7 @@ static void btrfs_read_locked_inode(struct inode *inode)
         inode_item = btrfs_item_ptr(leaf, path->slots[0],
                                     struct btrfs_inode_item);
         inode->i_mode = btrfs_inode_mode(leaf, inode_item);
-        inode->i_nlink = btrfs_inode_nlink(leaf, inode_item);
+        set_nlink(inode, btrfs_inode_nlink(leaf, inode_item));
         inode->i_uid = btrfs_inode_uid(leaf, inode_item);
         inode->i_gid = btrfs_inode_gid(leaf, inode_item);
         btrfs_i_size_write(inode, btrfs_inode_size(leaf, inode_item));
@@ -6698,7 +6698,7 @@ int btrfs_create_subvol_root(struct btrfs_trans_handle *trans,
         inode->i_op = &btrfs_dir_inode_operations;
         inode->i_fop = &btrfs_dir_file_operations;
 
-        inode->i_nlink = 1;
+        set_nlink(inode, 1);
         btrfs_i_size_write(inode, 0);
 
         err = btrfs_update_inode(trans, new_root, inode);
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 34a8b6112ea4..200f63bc6675 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -826,13 +826,9 @@ static char *setup_root_args(char *args)
 static struct dentry *mount_subvol(const char *subvol_name, int flags,
                                    const char *device_name, char *data)
 {
-        struct super_block *s;
         struct dentry *root;
         struct vfsmount *mnt;
-        struct mnt_namespace *ns_private;
         char *newargs;
-        struct path path;
-        int error;
 
         newargs = setup_root_args(data);
         if (!newargs)
@@ -843,39 +839,17 @@ static struct dentry *mount_subvol(const char *subvol_name, int flags,
         if (IS_ERR(mnt))
                 return ERR_CAST(mnt);
 
-        ns_private = create_mnt_ns(mnt);
-        if (IS_ERR(ns_private)) {
-                mntput(mnt);
-                return ERR_CAST(ns_private);
-        }
+        root = mount_subtree(mnt, subvol_name);
 
-        /*
-         * This will trigger the automount of the subvol so we can just
-         * drop the mnt we have here and return the dentry that we
-         * found.
-         */
-        error = vfs_path_lookup(mnt->mnt_root, mnt, subvol_name,
-                                LOOKUP_FOLLOW, &path);
-        put_mnt_ns(ns_private);
-        if (error)
-                return ERR_PTR(error);
-
-        if (!is_subvolume_inode(path.dentry->d_inode)) {
-                path_put(&path);
-                mntput(mnt);
-                error = -EINVAL;
+        if (!IS_ERR(root) && !is_subvolume_inode(root->d_inode)) {
+                struct super_block *s = root->d_sb;
+                dput(root);
+                root = ERR_PTR(-EINVAL);
+                deactivate_locked_super(s);
                 printk(KERN_ERR "btrfs: '%s' is not a valid subvolume\n",
                                 subvol_name);
-                return ERR_PTR(-EINVAL);
         }
 
-        /* Get a ref to the sb and the dentry we found and return it */
-        s = path.mnt->mnt_sb;
-        atomic_inc(&s->s_active);
-        root = dget(path.dentry);
-        path_put(&path);
-        down_write(&s->s_umount);
-
         return root;
 }
 
diff --git a/fs/btrfs/tree-log.c b/fs/btrfs/tree-log.c
index f4d81c06d48f..3568374d419d 100644
--- a/fs/btrfs/tree-log.c
+++ b/fs/btrfs/tree-log.c
@@ -1031,7 +1031,7 @@ static noinline int fixup_inode_link_count(struct btrfs_trans_handle *trans,
         }
         btrfs_release_path(path);
         if (nlink != inode->i_nlink) {
-                inode->i_nlink = nlink;
+                set_nlink(inode, nlink);
                 btrfs_update_inode(trans, root, inode);
         }
         BTRFS_I(inode)->index_cnt = (u64)-1;
diff --git a/fs/btrfs/xattr.c b/fs/btrfs/xattr.c
index a76e41c04b71..3848b04e310e 100644
--- a/fs/btrfs/xattr.c
+++ b/fs/btrfs/xattr.c
@@ -394,36 +394,36 @@ int btrfs_removexattr(struct dentry *dentry, const char *name)
                                 XATTR_REPLACE);
 }
 
-int btrfs_xattr_security_init(struct btrfs_trans_handle *trans,
-                              struct inode *inode, struct inode *dir,
-                              const struct qstr *qstr)
+int btrfs_initxattrs(struct inode *inode, const struct xattr *xattr_array,
+                     void *fs_info)
 {
-        int err;
-        size_t len;
-        void *value;
-        char *suffix;
+        const struct xattr *xattr;
+        struct btrfs_trans_handle *trans = fs_info;
         char *name;
+        int err = 0;
 
-        err = security_inode_init_security(inode, dir, qstr, &suffix, &value,
-                                           &len);
-        if (err) {
-                if (err == -EOPNOTSUPP)
-                        return 0;
-                return err;
-        }
-
-        name = kmalloc(XATTR_SECURITY_PREFIX_LEN + strlen(suffix) + 1,
-                       GFP_NOFS);
-        if (!name) {
-                err = -ENOMEM;
-        } else {
+        for (xattr = xattr_array; xattr->name != NULL; xattr++) {
+                name = kmalloc(XATTR_SECURITY_PREFIX_LEN +
+                               strlen(xattr->name) + 1, GFP_NOFS);
+                if (!name) {
+                        err = -ENOMEM;
+                        break;
+                }
                 strcpy(name, XATTR_SECURITY_PREFIX);
-                strcpy(name + XATTR_SECURITY_PREFIX_LEN, suffix);
-                err = __btrfs_setxattr(trans, inode, name, value, len, 0);
+                strcpy(name + XATTR_SECURITY_PREFIX_LEN, xattr->name);
+                err = __btrfs_setxattr(trans, inode, name,
+                                       xattr->value, xattr->value_len, 0);
                 kfree(name);
+                if (err < 0)
+                        break;
         }
-
-        kfree(suffix);
-        kfree(value);
         return err;
 }
+
+int btrfs_xattr_security_init(struct btrfs_trans_handle *trans,
+                              struct inode *inode, struct inode *dir,
+                              const struct qstr *qstr)
+{
+        return security_inode_init_security(inode, dir, qstr,
+                                            &btrfs_initxattrs, trans);
+}