9 files changed, 32 insertions, 85 deletions

diff --git a/fs/btrfs/acl.c b/fs/btrfs/acl.c
index 603972576f0f..f128427b995b 100644
--- a/fs/btrfs/acl.c
+++ b/fs/btrfs/acl.c
@@ -29,51 +29,28 @@
 
 #ifdef CONFIG_FS_POSIX_ACL
 
-static void btrfs_update_cached_acl(struct inode *inode,
-                                    struct posix_acl **p_acl,
-                                    struct posix_acl *acl)
-{
-        spin_lock(&inode->i_lock);
-        if (*p_acl && *p_acl != BTRFS_ACL_NOT_CACHED)
-                posix_acl_release(*p_acl);
-        *p_acl = posix_acl_dup(acl);
-        spin_unlock(&inode->i_lock);
-}
-
 static struct posix_acl *btrfs_get_acl(struct inode *inode, int type)
 {
         int size;
         const char *name;
         char *value = NULL;
-        struct posix_acl *acl = NULL, **p_acl;
+        struct posix_acl *acl;
+
+        acl = get_cached_acl(inode, type);
+        if (acl != ACL_NOT_CACHED)
+                return acl;
 
         switch (type) {
         case ACL_TYPE_ACCESS:
                 name = POSIX_ACL_XATTR_ACCESS;
-                p_acl = &BTRFS_I(inode)->i_acl;
                 break;
         case ACL_TYPE_DEFAULT:
                 name = POSIX_ACL_XATTR_DEFAULT;
-                p_acl = &BTRFS_I(inode)->i_default_acl;
                 break;
         default:
-                return ERR_PTR(-EINVAL);
+                BUG();
         }
 
-        /* Handle the cached NULL acl case without locking */
-        acl = ACCESS_ONCE(*p_acl);
-        if (!acl)
-                return acl;
-
-        spin_lock(&inode->i_lock);
-        acl = *p_acl;
-        if (acl != BTRFS_ACL_NOT_CACHED)
-                acl = posix_acl_dup(acl);
-        spin_unlock(&inode->i_lock);
-
-        if (acl != BTRFS_ACL_NOT_CACHED)
-                return acl;
-
         size = __btrfs_getxattr(inode, name, "", 0);
         if (size > 0) {
                 value = kzalloc(size, GFP_NOFS);
@@ -82,13 +59,13 @@ static struct posix_acl *btrfs_get_acl(struct inode *inode, int type)
                 size = __btrfs_getxattr(inode, name, value, size);
                 if (size > 0) {
                         acl = posix_acl_from_xattr(value, size);
-                        btrfs_update_cached_acl(inode, p_acl, acl);
+                        set_cached_acl(inode, type, acl);
                 }
                 kfree(value);
         } else if (size == -ENOENT || size == -ENODATA || size == 0) {
                 /* FIXME, who returns -ENOENT?  I think nobody */
                 acl = NULL;
-                btrfs_update_cached_acl(inode, p_acl, acl);
+                set_cached_acl(inode, type, acl);
         } else {
                 acl = ERR_PTR(-EIO);
         }
@@ -121,7 +98,6 @@ static int btrfs_set_acl(struct inode *inode, struct posix_acl *acl, int type)
 {
         int ret, size = 0;
         const char *name;
-        struct posix_acl **p_acl;
         char *value = NULL;
         mode_t mode;
 
@@ -141,13 +117,11 @@ static int btrfs_set_acl(struct inode *inode, struct posix_acl *acl, int type)
                 ret = 0;
                 inode->i_mode = mode;
                 name = POSIX_ACL_XATTR_ACCESS;
-                p_acl = &BTRFS_I(inode)->i_acl;
                 break;
         case ACL_TYPE_DEFAULT:
                 if (!S_ISDIR(inode->i_mode))
                         return acl ? -EINVAL : 0;
                 name = POSIX_ACL_XATTR_DEFAULT;
-                p_acl = &BTRFS_I(inode)->i_default_acl;
                 break;
         default:
                 return -EINVAL;
@@ -172,7 +146,7 @@ out:
         kfree(value);
 
         if (!ret)
-                btrfs_update_cached_acl(inode, p_acl, acl);
+                set_cached_acl(inode, type, acl);
 
         return ret;
 }
diff --git a/fs/btrfs/btrfs_inode.h b/fs/btrfs/btrfs_inode.h
index acb4f3517582..ea1ea0af8c0e 100644
--- a/fs/btrfs/btrfs_inode.h
+++ b/fs/btrfs/btrfs_inode.h
@@ -53,10 +53,6 @@ struct btrfs_inode {
         /* used to order data wrt metadata */
         struct btrfs_ordered_inode_tree ordered_tree;
 
-        /* standard acl pointers */
-        struct posix_acl *i_acl;
-        struct posix_acl *i_default_acl;
-
         /* for keeping track of orphaned inodes */
         struct list_head i_orphan;
 
diff --git a/fs/btrfs/compression.c b/fs/btrfs/compression.c
index de1e2fd32080..9d8ba4d54a37 100644
--- a/fs/btrfs/compression.c
+++ b/fs/btrfs/compression.c
@@ -26,7 +26,6 @@
 #include <linux/time.h>
 #include <linux/init.h>
 #include <linux/string.h>
-#include <linux/smp_lock.h>
 #include <linux/backing-dev.h>
 #include <linux/mpage.h>
 #include <linux/swap.h>
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 17ad92c29cfd..215ef8cae823 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -41,8 +41,6 @@ struct btrfs_ordered_sum;
 
 #define BTRFS_MAGIC "_BHRfS_M"
 
-#define BTRFS_ACL_NOT_CACHED    ((void *)-1)
-
 #define BTRFS_MAX_LEVEL 8
 
 #define BTRFS_COMPAT_EXTENT_TREE_V0
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 3a9b88759880..7dcaa8138864 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -42,6 +42,8 @@
 static struct extent_io_ops btree_extent_io_ops;
 static void end_workqueue_fn(struct btrfs_work *work);
 
+static atomic_t btrfs_bdi_num = ATOMIC_INIT(0);
+
 /*
  * end_io_wq structs are used to do processing in task context when an IO is
  * complete.  This is used during reads to verify checksums, and it is used
@@ -1343,12 +1345,25 @@ static void btrfs_unplug_io_fn(struct backing_dev_info *bdi, struct page *page)
         free_extent_map(em);
 }
 
+/*
+ * If this fails, caller must call bdi_destroy() to get rid of the
+ * bdi again.
+ */
 static int setup_bdi(struct btrfs_fs_info *info, struct backing_dev_info *bdi)
 {
-        bdi_init(bdi);
+        int err;
+
+        bdi->capabilities = BDI_CAP_MAP_COPY;
+        err = bdi_init(bdi);
+        if (err)
+                return err;
+
+        err = bdi_register(bdi, NULL, "btrfs-%d",
+                                atomic_inc_return(&btrfs_bdi_num));
+        if (err)
+                return err;
+
         bdi->ra_pages   = default_backing_dev_info.ra_pages;
-        bdi->state              = 0;
-        bdi->capabilities       = default_backing_dev_info.capabilities;
         bdi->unplug_io_fn       = btrfs_unplug_io_fn;
         bdi->unplug_io_data     = info;
         bdi->congested_fn       = btrfs_congested_fn;
@@ -1570,7 +1585,8 @@ struct btrfs_root *open_ctree(struct super_block *sb,
         fs_info->sb = sb;
         fs_info->max_extent = (u64)-1;
         fs_info->max_inline = 8192 * 1024;
-        setup_bdi(fs_info, &fs_info->bdi);
+        if (setup_bdi(fs_info, &fs_info->bdi))
+                goto fail_bdi;
         fs_info->btree_inode = new_inode(sb);
         fs_info->btree_inode->i_ino = 1;
         fs_info->btree_inode->i_nlink = 1;
@@ -1957,8 +1973,8 @@ fail_iput:
 
         btrfs_close_devices(fs_info->fs_devices);
         btrfs_mapping_tree_free(&fs_info->mapping_tree);
+fail_bdi:
         bdi_destroy(&fs_info->bdi);
-
 fail:
         kfree(extent_root);
         kfree(tree_root);
diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index 7c3cd248d8d6..4b833972273a 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -22,7 +22,6 @@
 #include <linux/time.h>
 #include <linux/init.h>
 #include <linux/string.h>
-#include <linux/smp_lock.h>
 #include <linux/backing-dev.h>
 #include <linux/mpage.h>
 #include <linux/swap.h>
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 3ea827ddf0fe..56fe83fa60c4 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -26,7 +26,6 @@
 #include <linux/time.h>
 #include <linux/init.h>
 #include <linux/string.h>
-#include <linux/smp_lock.h>
 #include <linux/backing-dev.h>
 #include <linux/mpage.h>
 #include <linux/swap.h>
@@ -2122,10 +2121,8 @@ static void btrfs_read_locked_inode(struct inode *inode)
          * any xattrs or acls
          */
         maybe_acls = acls_after_inode_item(leaf, path->slots[0], inode->i_ino);
-        if (!maybe_acls) {
-                BTRFS_I(inode)->i_acl = NULL;
-                BTRFS_I(inode)->i_default_acl = NULL;
-        }
+        if (!maybe_acls)
+                cache_no_acl(inode);
 
         BTRFS_I(inode)->block_group = btrfs_find_block_group(root, 0,
                                                 alloc_group_block, 0);
@@ -2322,7 +2319,6 @@ err:
         btrfs_update_inode(trans, root, dir);
         btrfs_drop_nlink(inode);
         ret = btrfs_update_inode(trans, root, inode);
-        dir->i_sb->s_dirt = 1;
 out:
         return ret;
 }
@@ -2806,7 +2802,6 @@ error:
                                       pending_del_nr);
         }
         btrfs_free_path(path);
-        inode->i_sb->s_dirt = 1;
         return ret;
 }
 
@@ -3143,9 +3138,6 @@ static noinline void init_btrfs_i(struct inode *inode)
 {
         struct btrfs_inode *bi = BTRFS_I(inode);
 
-        bi->i_acl = BTRFS_ACL_NOT_CACHED;
-        bi->i_default_acl = BTRFS_ACL_NOT_CACHED;
-
         bi->generation = 0;
         bi->sequence = 0;
         bi->last_trans = 0;
@@ -3769,7 +3761,6 @@ static int btrfs_mknod(struct inode *dir, struct dentry *dentry,
                 init_special_inode(inode, inode->i_mode, rdev);
                 btrfs_update_inode(trans, root, inode);
         }
-        dir->i_sb->s_dirt = 1;
         btrfs_update_inode_block_group(trans, inode);
         btrfs_update_inode_block_group(trans, dir);
 out_unlock:
@@ -3834,7 +3825,6 @@ static int btrfs_create(struct inode *dir, struct dentry *dentry,
                 inode->i_op = &btrfs_file_inode_operations;
                 BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;
         }
-        dir->i_sb->s_dirt = 1;
         btrfs_update_inode_block_group(trans, inode);
         btrfs_update_inode_block_group(trans, dir);
 out_unlock:
@@ -3881,7 +3871,6 @@ static int btrfs_link(struct dentry *old_dentry, struct inode *dir,
         if (err)
                 drop_inode = 1;
 
-        dir->i_sb->s_dirt = 1;
         btrfs_update_inode_block_group(trans, dir);
         err = btrfs_update_inode(trans, root, inode);
 
@@ -3963,7 +3952,6 @@ static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
 
         d_instantiate(dentry, inode);
         drop_on_err = 0;
-        dir->i_sb->s_dirt = 1;
         btrfs_update_inode_block_group(trans, inode);
         btrfs_update_inode_block_group(trans, dir);
 
@@ -4647,8 +4635,6 @@ struct inode *btrfs_alloc_inode(struct super_block *sb)
         ei->last_trans = 0;
         ei->logged_trans = 0;
         btrfs_ordered_inode_tree_init(&ei->ordered_tree);
-        ei->i_acl = BTRFS_ACL_NOT_CACHED;
-        ei->i_default_acl = BTRFS_ACL_NOT_CACHED;
         INIT_LIST_HEAD(&ei->i_orphan);
         INIT_LIST_HEAD(&ei->ordered_operations);
         return &ei->vfs_inode;
@@ -4662,13 +4648,6 @@ void btrfs_destroy_inode(struct inode *inode)
         WARN_ON(!list_empty(&inode->i_dentry));
         WARN_ON(inode->i_data.nrpages);
 
-        if (BTRFS_I(inode)->i_acl &&
-            BTRFS_I(inode)->i_acl != BTRFS_ACL_NOT_CACHED)
-                posix_acl_release(BTRFS_I(inode)->i_acl);
-        if (BTRFS_I(inode)->i_default_acl &&
-            BTRFS_I(inode)->i_default_acl != BTRFS_ACL_NOT_CACHED)
-                posix_acl_release(BTRFS_I(inode)->i_default_acl);
-
         /*
          * Make sure we're properly removed from the ordered operation
          * lists.
@@ -4992,7 +4971,6 @@ static int btrfs_symlink(struct inode *dir, struct dentry *dentry,
                 inode->i_op = &btrfs_file_inode_operations;
                 BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;
         }
-        dir->i_sb->s_dirt = 1;
         btrfs_update_inode_block_group(trans, inode);
         btrfs_update_inode_block_group(trans, dir);
         if (drop_inode)
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 9f4db848db10..bd88f25889f7 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -27,7 +27,6 @@
 #include <linux/time.h>
 #include <linux/init.h>
 #include <linux/string.h>
-#include <linux/smp_lock.h>
 #include <linux/backing-dev.h>
 #include <linux/mount.h>
 #include <linux/mpage.h>
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 708ac06b953b..6d6d06cb6dfc 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -26,7 +26,6 @@
 #include <linux/init.h>
 #include <linux/seq_file.h>
 #include <linux/string.h>
-#include <linux/smp_lock.h>
 #include <linux/backing-dev.h>
 #include <linux/mount.h>
 #include <linux/mpage.h>
@@ -394,10 +393,6 @@ int btrfs_sync_fs(struct super_block *sb, int wait)
         struct btrfs_root *root = btrfs_sb(sb);
         int ret;
 
-        if (sb->s_flags & MS_RDONLY)
-                return 0;
-
-        sb->s_dirt = 0;
         if (!wait) {
                 filemap_flush(root->fs_info->btree_inode->i_mapping);
                 return 0;
@@ -408,7 +403,6 @@ int btrfs_sync_fs(struct super_block *sb, int wait)
 
         trans = btrfs_start_transaction(root, 1);
         ret = btrfs_commit_transaction(trans, root);
-        sb->s_dirt = 0;
         return ret;
 }
 
@@ -454,11 +448,6 @@ static int btrfs_show_options(struct seq_file *seq, struct vfsmount *vfs)
         return 0;
 }
 
-static void btrfs_write_super(struct super_block *sb)
-{
-        sb->s_dirt = 0;
-}
-
 static int btrfs_test_super(struct super_block *s, void *data)
 {
         struct btrfs_fs_devices *test_fs_devices = data;
@@ -689,7 +678,6 @@ static int btrfs_unfreeze(struct super_block *sb)
 static struct super_operations btrfs_super_ops = {
         .delete_inode   = btrfs_delete_inode,
         .put_super      = btrfs_put_super,
-        .write_super    = btrfs_write_super,
         .sync_fs        = btrfs_sync_fs,
         .show_options   = btrfs_show_options,
         .write_inode    = btrfs_write_inode,