11 files changed, 148 insertions, 28 deletions

diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index d47ce8307854..3458b5725540 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -1284,6 +1284,8 @@ struct btrfs_root {
 #define BTRFS_INODE_DIRSYNC             (1 << 10)
 #define BTRFS_INODE_COMPRESS            (1 << 11)
 
+#define BTRFS_INODE_ROOT_ITEM_INIT      (1 << 31)
+
 /* some macros to generate set/get funcs for the struct fields.  This
  * assumes there is a lefoo_to_cpu for every type, so lets make a simple
  * one for u8:
@@ -2359,6 +2361,8 @@ int btrfs_find_dead_roots(struct btrfs_root *root, u64 objectid);
 int btrfs_find_orphan_roots(struct btrfs_root *tree_root);
 int btrfs_set_root_node(struct btrfs_root_item *item,
                         struct extent_buffer *node);
+void btrfs_check_and_init_root_item(struct btrfs_root_item *item);
+
 /* dir-item.c */
 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans,
                           struct btrfs_root *root, const char *name,
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index d7a7315bd031..8f1d44ba332f 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -1275,8 +1275,10 @@ struct btrfs_root *btrfs_read_fs_root_no_radix(struct btrfs_root *tree_root,
         root->commit_root = btrfs_root_node(root);
         BUG_ON(!root->node);
 out:
-        if (location->objectid != BTRFS_TREE_LOG_OBJECTID)
+        if (location->objectid != BTRFS_TREE_LOG_OBJECTID) {
                 root->ref_cows = 1;
+                btrfs_check_and_init_root_item(&root->root_item);
+        }
 
         return root;
 }
diff --git a/fs/btrfs/extent_map.c b/fs/btrfs/extent_map.c
index 2b6c12e983b3..a24a3f2fa13e 100644
--- a/fs/btrfs/extent_map.c
+++ b/fs/btrfs/extent_map.c
@@ -243,7 +243,7 @@ out:
  * Insert @em into @tree or perform a simple forward/backward merge with
  * existing mappings.  The extent_map struct passed in will be inserted
  * into the tree directly, with an additional reference taken, or a
- * reference dropped if the merge attempt was successfull.
+ * reference dropped if the merge attempt was successful.
  */
 int add_extent_mapping(struct extent_map_tree *tree,
                        struct extent_map *em)
diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index 656bc0a892b1..e621ea54a3fd 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -906,7 +906,7 @@ static noinline ssize_t __btrfs_buffered_write(struct file *file,
         unsigned long last_index;
         size_t num_written = 0;
         int nrptrs;
-        int ret;
+        int ret = 0;
 
         nrptrs = min((iov_iter_count(i) + PAGE_CACHE_SIZE - 1) /
                      PAGE_CACHE_SIZE, PAGE_CACHE_SIZE /
diff --git a/fs/btrfs/free-space-cache.c b/fs/btrfs/free-space-cache.c
index 0037427d8a9d..f561c953205b 100644
--- a/fs/btrfs/free-space-cache.c
+++ b/fs/btrfs/free-space-cache.c
@@ -24,6 +24,7 @@
 #include "free-space-cache.h"
 #include "transaction.h"
 #include "disk-io.h"
+#include "extent_io.h"
 
 #define BITS_PER_BITMAP         (PAGE_CACHE_SIZE * 8)
 #define MAX_CACHE_BYTES_PER_GIG (32 * 1024)
@@ -81,6 +82,8 @@ struct inode *lookup_free_space_inode(struct btrfs_root *root,
                 return ERR_PTR(-ENOENT);
         }
 
+        inode->i_mapping->flags &= ~__GFP_FS;
+
         spin_lock(&block_group->lock);
         if (!root->fs_info->closing) {
                 block_group->inode = igrab(inode);
@@ -222,6 +225,7 @@ int load_free_space_cache(struct btrfs_fs_info *fs_info,
         u64 num_entries;
         u64 num_bitmaps;
         u64 generation;
+        u64 used = btrfs_block_group_used(&block_group->item);
         u32 cur_crc = ~(u32)0;
         pgoff_t index = 0;
         unsigned long first_page_offset;
@@ -467,6 +471,17 @@ next:
                 index++;
         }
 
+        spin_lock(&block_group->tree_lock);
+        if (block_group->free_space != (block_group->key.offset - used -
+                                        block_group->bytes_super)) {
+                spin_unlock(&block_group->tree_lock);
+                printk(KERN_ERR "block group %llu has an wrong amount of free "
+                       "space\n", block_group->key.objectid);
+                ret = 0;
+                goto free_cache;
+        }
+        spin_unlock(&block_group->tree_lock);
+
         ret = 1;
 out:
         kfree(checksums);
@@ -495,8 +510,11 @@ int btrfs_write_out_cache(struct btrfs_root *root,
         struct list_head *pos, *n;
         struct page *page;
         struct extent_state *cached_state = NULL;
+        struct btrfs_free_cluster *cluster = NULL;
+        struct extent_io_tree *unpin = NULL;
         struct list_head bitmap_list;
         struct btrfs_key key;
+        u64 start, end, len;
         u64 bytes = 0;
         u32 *crc, *checksums;
         pgoff_t index = 0, last_index = 0;
@@ -505,6 +523,7 @@ int btrfs_write_out_cache(struct btrfs_root *root,
         int entries = 0;
         int bitmaps = 0;
         int ret = 0;
+        bool next_page = false;
 
         root = root->fs_info->tree_root;
 
@@ -551,6 +570,18 @@ int btrfs_write_out_cache(struct btrfs_root *root,
          */
         first_page_offset = (sizeof(u32) * num_checksums) + sizeof(u64);
 
+        /* Get the cluster for this block_group if it exists */
+        if (!list_empty(&block_group->cluster_list))
+                cluster = list_entry(block_group->cluster_list.next,
+                                     struct btrfs_free_cluster,
+                                     block_group_list);
+
+        /*
+         * We shouldn't have switched the pinned extents yet so this is the
+         * right one
+         */
+        unpin = root->fs_info->pinned_extents;
+
         /*
          * Lock all pages first so we can lock the extent safely.
          *
@@ -580,6 +611,12 @@ int btrfs_write_out_cache(struct btrfs_root *root,
         lock_extent_bits(&BTRFS_I(inode)->io_tree, 0, i_size_read(inode) - 1,
                          0, &cached_state, GFP_NOFS);
 
+        /*
+         * When searching for pinned extents, we need to start at our start
+         * offset.
+         */
+        start = block_group->key.objectid;
+
         /* Write out the extent entries */
         do {
                 struct btrfs_free_space_entry *entry;
@@ -587,6 +624,8 @@ int btrfs_write_out_cache(struct btrfs_root *root,
                 unsigned long offset = 0;
                 unsigned long start_offset = 0;
 
+                next_page = false;
+
                 if (index == 0) {
                         start_offset = first_page_offset;
                         offset = start_offset;
@@ -598,7 +637,7 @@ int btrfs_write_out_cache(struct btrfs_root *root,
                 entry = addr + start_offset;
 
                 memset(addr, 0, PAGE_CACHE_SIZE);
-                while (1) {
+                while (node && !next_page) {
                         struct btrfs_free_space *e;
 
                         e = rb_entry(node, struct btrfs_free_space, offset_index);
@@ -614,12 +653,49 @@ int btrfs_write_out_cache(struct btrfs_root *root,
                                 entry->type = BTRFS_FREE_SPACE_EXTENT;
                         }
                         node = rb_next(node);
-                        if (!node)
-                                break;
+                        if (!node && cluster) {
+                                node = rb_first(&cluster->root);
+                                cluster = NULL;
+                        }
                         offset += sizeof(struct btrfs_free_space_entry);
                         if (offset + sizeof(struct btrfs_free_space_entry) >=
                             PAGE_CACHE_SIZE)
+                                next_page = true;
+                        entry++;
+                }
+
+                /*
+                 * We want to add any pinned extents to our free space cache
+                 * so we don't leak the space
+                 */
+                while (!next_page && (start < block_group->key.objectid +
+                                      block_group->key.offset)) {
+                        ret = find_first_extent_bit(unpin, start, &start, &end,
+                                                    EXTENT_DIRTY);
+                        if (ret) {
+                                ret = 0;
+                                break;
+                        }
+
+                        /* This pinned extent is out of our range */
+                        if (start >= block_group->key.objectid +
+                            block_group->key.offset)
                                 break;
+
+                        len = block_group->key.objectid +
+                                block_group->key.offset - start;
+                        len = min(len, end + 1 - start);
+
+                        entries++;
+                        entry->offset = cpu_to_le64(start);
+                        entry->bytes = cpu_to_le64(len);
+                        entry->type = BTRFS_FREE_SPACE_EXTENT;
+
+                        start = end + 1;
+                        offset += sizeof(struct btrfs_free_space_entry);
+                        if (offset + sizeof(struct btrfs_free_space_entry) >=
+                            PAGE_CACHE_SIZE)
+                                next_page = true;
                         entry++;
                 }
                 *crc = ~(u32)0;
@@ -650,7 +726,7 @@ int btrfs_write_out_cache(struct btrfs_root *root,
                 page_cache_release(page);
 
                 index++;
-        } while (node);
+        } while (node || next_page);
 
         /* Write out the bitmaps */
         list_for_each_safe(pos, n, &bitmap_list) {
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 93c28a1d6bdc..5cc64ab9c485 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -112,6 +112,7 @@ static int btrfs_init_inode_security(struct btrfs_trans_handle *trans,
 static noinline int insert_inline_extent(struct btrfs_trans_handle *trans,
                                 struct btrfs_root *root, struct inode *inode,
                                 u64 start, size_t size, size_t compressed_size,
+                                int compress_type,
                                 struct page **compressed_pages)
 {
         struct btrfs_key key;
@@ -126,12 +127,9 @@ static noinline int insert_inline_extent(struct btrfs_trans_handle *trans,
         size_t cur_size = size;
         size_t datasize;
         unsigned long offset;
-        int compress_type = BTRFS_COMPRESS_NONE;
 
-        if (compressed_size && compressed_pages) {
-                compress_type = root->fs_info->compress_type;
+        if (compressed_size && compressed_pages)
                 cur_size = compressed_size;
-        }
 
         path = btrfs_alloc_path();
         if (!path)
@@ -221,7 +219,7 @@ fail:
 static noinline int cow_file_range_inline(struct btrfs_trans_handle *trans,
                                  struct btrfs_root *root,
                                  struct inode *inode, u64 start, u64 end,
-                                 size_t compressed_size,
+                                 size_t compressed_size, int compress_type,
                                  struct page **compressed_pages)
 {
         u64 isize = i_size_read(inode);
@@ -254,7 +252,7 @@ static noinline int cow_file_range_inline(struct btrfs_trans_handle *trans,
                 inline_len = min_t(u64, isize, actual_end);
         ret = insert_inline_extent(trans, root, inode, start,
                                    inline_len, compressed_size,
-                                   compressed_pages);
+                                   compress_type, compressed_pages);
         BUG_ON(ret);
         btrfs_delalloc_release_metadata(inode, end + 1 - start);
         btrfs_drop_extent_cache(inode, start, aligned_end - 1, 0);
@@ -433,12 +431,13 @@ again:
                          * to make an uncompressed inline extent.
                          */
                         ret = cow_file_range_inline(trans, root, inode,
-                                                    start, end, 0, NULL);
+                                                    start, end, 0, 0, NULL);
                 } else {
                         /* try making a compressed inline extent */
                         ret = cow_file_range_inline(trans, root, inode,
                                                     start, end,
-                                                    total_compressed, pages);
+                                                    total_compressed,
+                                                    compress_type, pages);
                 }
                 if (ret == 0) {
                         /*
@@ -792,7 +791,7 @@ static noinline int cow_file_range(struct inode *inode,
         if (start == 0) {
                 /* lets try to make an inline extent */
                 ret = cow_file_range_inline(trans, root, inode,
-                                            start, end, 0, NULL);
+                                            start, end, 0, 0, NULL);
                 if (ret == 0) {
                         extent_clear_unlock_delalloc(inode,
                                      &BTRFS_I(inode)->io_tree,
@@ -2222,8 +2221,6 @@ int btrfs_orphan_add(struct btrfs_trans_handle *trans, struct inode *inode)
                         insert = 1;
 #endif
                 insert = 1;
-        } else {
-                WARN_ON(!BTRFS_I(inode)->orphan_meta_reserved);
         }
 
         if (!BTRFS_I(inode)->orphan_meta_reserved) {
@@ -2324,7 +2321,7 @@ int btrfs_orphan_cleanup(struct btrfs_root *root)
 
                 /*
                  * if ret == 0 means we found what we were searching for, which
-                 * is weird, but possible, so only screw with path if we didnt
+                 * is weird, but possible, so only screw with path if we didn't
                  * find the key and see if we have stuff that matches
                  */
                 if (ret > 0) {
@@ -2537,8 +2534,6 @@ static void btrfs_read_locked_inode(struct inode *inode)
         BTRFS_I(inode)->flags = btrfs_inode_flags(leaf, inode_item);
 
         alloc_group_block = btrfs_inode_block_group(leaf, inode_item);
-        if (location.objectid == BTRFS_FREE_SPACE_OBJECTID)
-                inode->i_mapping->flags &= ~__GFP_FS;
 
         /*
          * try to precache a NULL acl entry for files that don't have
@@ -6960,8 +6955,10 @@ static int btrfs_rename(struct inode *old_dir, struct dentry *old_dentry,
          * should cover the worst case number of items we'll modify.
          */
         trans = btrfs_start_transaction(root, 20);
-        if (IS_ERR(trans))
-                return PTR_ERR(trans);
+        if (IS_ERR(trans)) {
+                ret = PTR_ERR(trans);
+                goto out_notrans;
+        }
 
         btrfs_set_trans_block_group(trans, new_dir);
 
@@ -7061,7 +7058,7 @@ static int btrfs_rename(struct inode *old_dir, struct dentry *old_dentry,
         }
 out_fail:
         btrfs_end_transaction_throttle(trans, root);
-
+out_notrans:
         if (old_inode->i_ino == BTRFS_FIRST_FREE_OBJECTID)
                 up_read(&root->fs_info->subvol_sem);
 
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 7c07fe26b7cf..cfc264fefdb0 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -373,6 +373,10 @@ static noinline int create_subvol(struct btrfs_root *root,
         inode_item->nbytes = cpu_to_le64(root->leafsize);
         inode_item->mode = cpu_to_le32(S_IFDIR | 0755);
 
+        root_item.flags = 0;
+        root_item.byte_limit = 0;
+        inode_item->flags = cpu_to_le64(BTRFS_INODE_ROOT_ITEM_INIT);
+
         btrfs_set_root_bytenr(&root_item, leaf->start);
         btrfs_set_root_generation(&root_item, trans->transid);
         btrfs_set_root_level(&root_item, 0);
@@ -2436,8 +2440,10 @@ static noinline long btrfs_ioctl_start_sync(struct file *file, void __user *argp
                 return PTR_ERR(trans);
         transid = trans->transid;
         ret = btrfs_commit_transaction_async(trans, root, 0);
-        if (ret)
+        if (ret) {
+                btrfs_end_transaction(trans, root);
                 return ret;
+        }
 
         if (argp)
                 if (copy_to_user(argp, &transid, sizeof(transid)))
diff --git a/fs/btrfs/relocation.c b/fs/btrfs/relocation.c
index 58250e09eb05..199a80134312 100644
--- a/fs/btrfs/relocation.c
+++ b/fs/btrfs/relocation.c
@@ -2346,7 +2346,7 @@ struct btrfs_root *select_one_root(struct btrfs_trans_handle *trans,
                 root = next->root;
                 BUG_ON(!root);
 
-                /* no other choice for non-refernce counted tree */
+                /* no other choice for non-references counted tree */
                 if (!root->ref_cows)
                         return root;
 
diff --git a/fs/btrfs/root-tree.c b/fs/btrfs/root-tree.c
index 29b2d7c930eb..6928bff62daa 100644
--- a/fs/btrfs/root-tree.c
+++ b/fs/btrfs/root-tree.c
@@ -473,3 +473,21 @@ again:
         btrfs_free_path(path);
         return 0;
 }
+
+/*
+ * Old btrfs forgets to init root_item->flags and root_item->byte_limit
+ * for subvolumes. To work around this problem, we steal a bit from
+ * root_item->inode_item->flags, and use it to indicate if those fields
+ * have been properly initialized.
+ */
+void btrfs_check_and_init_root_item(struct btrfs_root_item *root_item)
+{
+        u64 inode_flags = le64_to_cpu(root_item->inode.flags);
+
+        if (!(inode_flags & BTRFS_INODE_ROOT_ITEM_INIT)) {
+                inode_flags |= BTRFS_INODE_ROOT_ITEM_INIT;
+                root_item->inode.flags = cpu_to_le64(inode_flags);
+                root_item->flags = 0;
+                root_item->byte_limit = 0;
+        }
+}
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 2edfc039f098..58e7de9cc90c 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -644,6 +644,7 @@ static int btrfs_show_options(struct seq_file *seq, struct vfsmount *vfs)
 {
         struct btrfs_root *root = btrfs_sb(vfs->mnt_sb);
         struct btrfs_fs_info *info = root->fs_info;
+        char *compress_type;
 
         if (btrfs_test_opt(root, DEGRADED))
                 seq_puts(seq, ",degraded");
@@ -662,8 +663,16 @@ static int btrfs_show_options(struct seq_file *seq, struct vfsmount *vfs)
         if (info->thread_pool_size !=  min_t(unsigned long,
                                              num_online_cpus() + 2, 8))
                 seq_printf(seq, ",thread_pool=%d", info->thread_pool_size);
-        if (btrfs_test_opt(root, COMPRESS))
-                seq_puts(seq, ",compress");
+        if (btrfs_test_opt(root, COMPRESS)) {
+                if (info->compress_type == BTRFS_COMPRESS_ZLIB)
+                        compress_type = "zlib";
+                else
+                        compress_type = "lzo";
+                if (btrfs_test_opt(root, FORCE_COMPRESS))
+                        seq_printf(seq, ",compress-force=%s", compress_type);
+                else
+                        seq_printf(seq, ",compress=%s", compress_type);
+        }
         if (btrfs_test_opt(root, NOSSD))
                 seq_puts(seq, ",nossd");
         if (btrfs_test_opt(root, SSD_SPREAD))
@@ -678,6 +687,12 @@ static int btrfs_show_options(struct seq_file *seq, struct vfsmount *vfs)
                 seq_puts(seq, ",discard");
         if (!(root->fs_info->sb->s_flags & MS_POSIXACL))
                 seq_puts(seq, ",noacl");
+        if (btrfs_test_opt(root, SPACE_CACHE))
+                seq_puts(seq, ",space_cache");
+        if (btrfs_test_opt(root, CLEAR_CACHE))
+                seq_puts(seq, ",clear_cache");
+        if (btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED))
+                seq_puts(seq, ",user_subvol_rm_allowed");
         return 0;
 }
 
diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c
index ce48eb59d615..5b158da7e0bb 100644
--- a/fs/btrfs/transaction.c
+++ b/fs/btrfs/transaction.c
@@ -197,6 +197,7 @@ again:
 
         ret = join_transaction(root);
         if (ret < 0) {
+                kmem_cache_free(btrfs_trans_handle_cachep, h);
                 if (type != TRANS_JOIN_NOLOCK)
                         mutex_unlock(&root->fs_info->trans_mutex);
                 return ERR_PTR(ret);
@@ -975,6 +976,7 @@ static noinline int create_pending_snapshot(struct btrfs_trans_handle *trans,
         record_root_in_trans(trans, root);
         btrfs_set_root_last_snapshot(&root->root_item, trans->transid);
         memcpy(new_root_item, &root->root_item, sizeof(*new_root_item));
+        btrfs_check_and_init_root_item(new_root_item);
 
         root_flags = btrfs_root_flags(new_root_item);
         if (pending->readonly)