Btrfs: Tree logging fixes

* Pin down data blocks to prevent them from being reallocated like so:

trans 1: allocate file extent
trans 2: free file extent
trans 3: free file extent during old snapshot deletion
trans 3: allocate file extent to new file
trans 3: fsync new file

Before the tree logging code, this was legal because the fsync
would commit the transation that did the final data extent free
and the transaction that allocated the extent to the new file
at the same time.

With the tree logging code, the tree log subtransaction can commit
before the transaction that freed the extent.  If we crash,
we're left with two different files using the extent.

* Don't wait in start_transaction if log replay is going on.  This
avoids deadlocks from iput while we're cleaning up link counts in the
replay code.

* Don't deadlock in replay_one_name by trying to read an inode off
the disk while holding paths for the directory

* Hold the buffer lock while we mark a buffer as written.  This
closes a race where someone is changing a buffer while we write it.
They are supposed to mark it dirty again after they change it, but
this violates the cow rules.

Signed-off-by: Chris Mason <chris.mason@oracle.com>

7 files changed, 107 insertions, 24 deletions

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index a4373db5967a..42bf99168056 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -307,9 +307,7 @@ int csum_dirty_buffer(struct btrfs_root *root, struct page *page)
                 goto err;
         }
         found_level = btrfs_header_level(eb);
-        spin_lock(&root->fs_info->hash_lock);
-        btrfs_set_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN);
-        spin_unlock(&root->fs_info->hash_lock);
+
         csum_tree_block(root, eb, 0);
 err:
         free_extent_buffer(eb);
@@ -1998,7 +1996,36 @@ int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid)
         return ret;
 }
 
+int btree_lock_page_hook(struct page *page)
+{
+        struct inode *inode = page->mapping->host;
+        struct btrfs_root *root = BTRFS_I(inode)->root;
+        struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
+        struct extent_buffer *eb;
+        unsigned long len;
+        u64 bytenr = page_offset(page);
+
+        if (page->private == EXTENT_PAGE_PRIVATE)
+                goto out;
+
+        len = page->private >> 2;
+        eb = find_extent_buffer(io_tree, bytenr, len, GFP_NOFS);
+        if (!eb)
+                goto out;
+
+        btrfs_tree_lock(eb);
+        spin_lock(&root->fs_info->hash_lock);
+        btrfs_set_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN);
+        spin_unlock(&root->fs_info->hash_lock);
+        btrfs_tree_unlock(eb);
+        free_extent_buffer(eb);
+out:
+        lock_page(page);
+        return 0;
+}
+
 static struct extent_io_ops btree_extent_io_ops = {
+        .write_cache_pages_lock_hook = btree_lock_page_hook,
         .writepage_io_hook = btree_writepage_io_hook,
         .readpage_end_io_hook = btree_readpage_end_io_hook,
         .submit_bio_hook = btree_submit_bio_hook,
diff --git a/fs/btrfs/disk-io.h b/fs/btrfs/disk-io.h
index 6b6fdc697f31..f84f5058dbbb 100644
--- a/fs/btrfs/disk-io.h
+++ b/fs/btrfs/disk-io.h
@@ -80,4 +80,5 @@ int btrfs_free_log_root_tree(struct btrfs_trans_handle *trans,
                              struct btrfs_fs_info *fs_info);
 int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans,
                              struct btrfs_fs_info *fs_info);
+int btree_lock_page_hook(struct page *page);
 #endif
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 646b9148ca21..3181759da1cf 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -1590,13 +1590,17 @@ static int finish_current_insert(struct btrfs_trans_handle *trans,
 }
 
 static int pin_down_bytes(struct btrfs_root *root, u64 bytenr, u32 num_bytes,
-                          int pending)
+                          int is_data, int pending)
 {
         int err = 0;
 
         WARN_ON(!mutex_is_locked(&root->fs_info->alloc_mutex));
         if (!pending) {
                 struct extent_buffer *buf;
+
+                if (is_data)
+                        goto pinit;
+
                 buf = btrfs_find_tree_block(root, bytenr, num_bytes);
                 if (buf) {
                         /* we can reuse a block if it hasn't been written
@@ -1624,6 +1628,7 @@ static int pin_down_bytes(struct btrfs_root *root, u64 bytenr, u32 num_bytes,
                         }
                         free_extent_buffer(buf);
                 }
+pinit:
                 btrfs_update_pinned_extents(root, bytenr, num_bytes, 1);
         } else {
                 set_extent_bits(&root->fs_info->pending_del,
@@ -1744,7 +1749,8 @@ static int __free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
 #endif
 
                 if (pin) {
-                        ret = pin_down_bytes(root, bytenr, num_bytes, 0);
+                        ret = pin_down_bytes(root, bytenr, num_bytes,
+                             owner_objectid >= BTRFS_FIRST_FREE_OBJECTID, 0);
                         if (ret > 0)
                                 mark_free = 1;
                         BUG_ON(ret < 0);
@@ -1862,9 +1868,17 @@ static int __btrfs_free_extent(struct btrfs_trans_handle *trans,
                 ref_generation = 0;
 
         if (root == extent_root) {
-                pin_down_bytes(root, bytenr, num_bytes, 1);
+                pin_down_bytes(root, bytenr, num_bytes, 0, 1);
                 return 0;
         }
+        /* if metadata always pin */
+        if (owner_objectid < BTRFS_FIRST_FREE_OBJECTID)
+                pin = 1;
+
+        /* if data pin when any transaction has committed this */
+        if (ref_generation != trans->transid)
+                pin = 1;
+
         ret = __free_extent(trans, root, bytenr, num_bytes, root_objectid,
                             ref_generation, owner_objectid, owner_offset,
                             pin, pin == 0);
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 239e7c908abf..319a0c7a4a58 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -29,7 +29,10 @@ static struct kmem_cache *extent_buffer_cache;
 
 static LIST_HEAD(buffers);
 static LIST_HEAD(states);
+
+#ifdef LEAK_DEBUG
 static spinlock_t leak_lock = SPIN_LOCK_UNLOCKED;
+#endif
 
 #define BUFFER_LRU_MAX 64
 
@@ -106,7 +109,9 @@ EXPORT_SYMBOL(extent_io_tree_init);
 struct extent_state *alloc_extent_state(gfp_t mask)
 {
         struct extent_state *state;
+#ifdef LEAK_DEBUG
         unsigned long flags;
+#endif
 
         state = kmem_cache_alloc(extent_state_cache, mask);
         if (!state)
@@ -114,10 +119,11 @@ struct extent_state *alloc_extent_state(gfp_t mask)
         state->state = 0;
         state->private = 0;
         state->tree = NULL;
+#ifdef LEAK_DEBUG
         spin_lock_irqsave(&leak_lock, flags);
         list_add(&state->leak_list, &states);
         spin_unlock_irqrestore(&leak_lock, flags);
-
+#endif
         atomic_set(&state->refs, 1);
         init_waitqueue_head(&state->wq);
         return state;
@@ -129,11 +135,15 @@ void free_extent_state(struct extent_state *state)
         if (!state)
                 return;
         if (atomic_dec_and_test(&state->refs)) {
+#ifdef LEAK_DEBUG
                 unsigned long flags;
+#endif
                 WARN_ON(state->tree);
+#ifdef LEAK_DEBUG
                 spin_lock_irqsave(&leak_lock, flags);
                 list_del(&state->leak_list);
                 spin_unlock_irqrestore(&leak_lock, flags);
+#endif
                 kmem_cache_free(extent_state_cache, state);
         }
 }
@@ -2070,13 +2080,13 @@ done:
 }
 
 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,22)
-/* Taken directly from 2.6.23 for 2.6.18 back port */
+/* Taken directly from 2.6.23 with a mod for a lockpage hook */
 typedef int (*writepage_t)(struct page *page, struct writeback_control *wbc,
                                 void *data);
+#endif
 
 /**
- * write_cache_pages - walk the list of dirty pages of the given address space
- * and write all of them.
+ * write_cache_pages - walk the list of dirty pages of the given address space and write all of them.
  * @mapping: address space structure to write
  * @wbc: subtract the number of written pages from *@wbc->nr_to_write
  * @writepage: function called for each page
@@ -2090,9 +2100,10 @@ typedef int (*writepage_t)(struct page *page, struct writeback_control *wbc,
  * WB_SYNC_ALL then we were called for data integrity and we must wait for
  * existing IO to complete.
  */
-static int write_cache_pages(struct address_space *mapping,
-                      struct writeback_control *wbc, writepage_t writepage,
-                      void *data)
+int extent_write_cache_pages(struct extent_io_tree *tree,
+                             struct address_space *mapping,
+                             struct writeback_control *wbc,
+                             writepage_t writepage, void *data)
 {
         struct backing_dev_info *bdi = mapping->backing_dev_info;
         int ret = 0;
@@ -2138,7 +2149,10 @@ retry:
                          * swizzled back from swapper_space to tmpfs file
                          * mapping
                          */
-                        lock_page(page);
+                        if (tree->ops && tree->ops->write_cache_pages_lock_hook)
+                                tree->ops->write_cache_pages_lock_hook(page);
+                        else
+                                lock_page(page);
 
                         if (unlikely(page->mapping != mapping)) {
                                 unlock_page(page);
@@ -2187,9 +2201,12 @@ retry:
         }
         if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0))
                 mapping->writeback_index = index;
+
+        if (wbc->range_cont)
+                wbc->range_start = index << PAGE_CACHE_SHIFT;
         return ret;
 }
-#endif
+EXPORT_SYMBOL(extent_write_cache_pages);
 
 int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
                           get_extent_t *get_extent,
@@ -2214,7 +2231,8 @@ int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
 
         ret = __extent_writepage(page, wbc, &epd);
 
-        write_cache_pages(mapping, &wbc_writepages, __extent_writepage, &epd);
+        extent_write_cache_pages(tree, mapping, &wbc_writepages,
+                                 __extent_writepage, &epd);
         if (epd.bio) {
                 submit_one_bio(WRITE, epd.bio, 0);
         }
@@ -2235,7 +2253,8 @@ int extent_writepages(struct extent_io_tree *tree,
                 .get_extent = get_extent,
         };
 
-        ret = write_cache_pages(mapping, wbc, __extent_writepage, &epd);
+        ret = extent_write_cache_pages(tree, mapping, wbc,
+                                       __extent_writepage, &epd);
         if (epd.bio) {
                 submit_one_bio(WRITE, epd.bio, 0);
         }
@@ -2567,15 +2586,19 @@ static struct extent_buffer *__alloc_extent_buffer(struct extent_io_tree *tree,
                                                    gfp_t mask)
 {
         struct extent_buffer *eb = NULL;
+#ifdef LEAK_DEBUG
         unsigned long flags;
+#endif
 
         eb = kmem_cache_zalloc(extent_buffer_cache, mask);
         eb->start = start;
         eb->len = len;
         mutex_init(&eb->mutex);
+#ifdef LEAK_DEBUG
         spin_lock_irqsave(&leak_lock, flags);
         list_add(&eb->leak_list, &buffers);
         spin_unlock_irqrestore(&leak_lock, flags);
+#endif
         atomic_set(&eb->refs, 1);
 
         return eb;
@@ -2583,10 +2606,12 @@ static struct extent_buffer *__alloc_extent_buffer(struct extent_io_tree *tree,
 
 static void __free_extent_buffer(struct extent_buffer *eb)
 {
+#ifdef LEAK_DEBUG
         unsigned long flags;
         spin_lock_irqsave(&leak_lock, flags);
         list_del(&eb->leak_list);
         spin_unlock_irqrestore(&leak_lock, flags);
+#endif
         kmem_cache_free(extent_buffer_cache, eb);
 }
 
diff --git a/fs/btrfs/extent_io.h b/fs/btrfs/extent_io.h
index 315cfceae312..3cb411a5f4d3 100644
--- a/fs/btrfs/extent_io.h
+++ b/fs/btrfs/extent_io.h
@@ -50,6 +50,7 @@ struct extent_io_ops {
                             unsigned long old, unsigned long bits);
         int (*clear_bit_hook)(struct inode *inode, u64 start, u64 end,
                             unsigned long old, unsigned long bits);
+        int (*write_cache_pages_lock_hook)(struct page *page);
 };
 
 struct extent_io_tree {
diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c
index 49c4f5b40ed6..61a377bcb2fb 100644
--- a/fs/btrfs/transaction.c
+++ b/fs/btrfs/transaction.c
@@ -161,7 +161,8 @@ static struct btrfs_trans_handle *start_transaction(struct btrfs_root *root,
         int ret;
 
         mutex_lock(&root->fs_info->trans_mutex);
-        if ((wait == 1 && !root->fs_info->open_ioctl_trans) || wait == 2)
+        if (!root->fs_info->log_root_recovering &&
+            ((wait == 1 && !root->fs_info->open_ioctl_trans) || wait == 2))
                 wait_current_trans(root);
         ret = join_transaction(root);
         BUG_ON(ret);
@@ -328,9 +329,17 @@ int btrfs_write_and_wait_transaction(struct btrfs_trans_handle *trans,
 
                         index = start >> PAGE_CACHE_SHIFT;
                         start = (u64)(index + 1) << PAGE_CACHE_SHIFT;
-                        page = find_lock_page(btree_inode->i_mapping, index);
+                        page = find_get_page(btree_inode->i_mapping, index);
                         if (!page)
                                 continue;
+
+                        btree_lock_page_hook(page);
+                        if (!page->mapping) {
+                                unlock_page(page);
+                                page_cache_release(page);
+                                continue;
+                        }
+
                         if (PageWriteback(page)) {
                                 if (PageDirty(page))
                                         wait_on_page_writeback(page);
@@ -360,7 +369,8 @@ int btrfs_write_and_wait_transaction(struct btrfs_trans_handle *trans,
                         if (!page)
                                 continue;
                         if (PageDirty(page)) {
-                                lock_page(page);
+                                btree_lock_page_hook(page);
+                                wait_on_page_writeback(page);
                                 err = write_one_page(page, 0);
                                 if (err)
                                         werr = err;
diff --git a/fs/btrfs/tree-log.c b/fs/btrfs/tree-log.c
index d1ce8314b948..13d7ee8e0c52 100644
--- a/fs/btrfs/tree-log.c
+++ b/fs/btrfs/tree-log.c
@@ -1176,8 +1176,8 @@ static noinline int replay_one_name(struct btrfs_trans_handle *trans,
         struct btrfs_key found_key;
         struct btrfs_key log_key;
         struct inode *dir;
-        struct inode *inode;
         u8 log_type;
+        int exists;
         int ret;
 
         dir = read_one_inode(root, key->objectid);
@@ -1190,6 +1190,13 @@ static noinline int replay_one_name(struct btrfs_trans_handle *trans,
                    name_len);
 
         btrfs_dir_item_key_to_cpu(eb, di, &log_key);
+        exists = btrfs_lookup_inode(trans, root, path, &log_key, 0);
+        if (exists == 0)
+                exists = 1;
+        else
+                exists = 0;
+        btrfs_release_path(root, path);
+
         if (key->type == BTRFS_DIR_ITEM_KEY) {
                 dst_di = btrfs_lookup_dir_item(trans, root, path, key->objectid,
                                        name, name_len, 1);
@@ -1224,11 +1231,9 @@ static noinline int replay_one_name(struct btrfs_trans_handle *trans,
          * don't drop the conflicting directory entry if the inode
          * for the new entry doesn't exist
          */
-        inode = read_one_inode(root, log_key.objectid);
-        if (!inode)
+        if (!exists)
                 goto out;
 
-        iput(inode);
         ret = drop_one_dir_item(trans, root, path, dir, dst_di);
         BUG_ON(ret);