1 files changed, 8 insertions, 27 deletions

diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index 4b833972273a..571ad3c13b47 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -112,8 +112,6 @@ static noinline int dirty_and_release_pages(struct btrfs_trans_handle *trans,
         int err = 0;
         int i;
         struct inode *inode = fdentry(file)->d_inode;
-        struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
-        u64 hint_byte;
         u64 num_bytes;
         u64 start_pos;
         u64 end_of_last_block;
@@ -125,22 +123,6 @@ static noinline int dirty_and_release_pages(struct btrfs_trans_handle *trans,
                     root->sectorsize - 1) & ~((u64)root->sectorsize - 1);
 
         end_of_last_block = start_pos + num_bytes - 1;
-
-        lock_extent(io_tree, start_pos, end_of_last_block, GFP_NOFS);
-        trans = btrfs_join_transaction(root, 1);
-        if (!trans) {
-                err = -ENOMEM;
-                goto out_unlock;
-        }
-        btrfs_set_trans_block_group(trans, inode);
-        hint_byte = 0;
-
-        set_extent_uptodate(io_tree, start_pos, end_of_last_block, GFP_NOFS);
-
-        /* check for reserved extents on each page, we don't want
-         * to reset the delalloc bit on things that already have
-         * extents reserved.
-         */
         btrfs_set_extent_delalloc(inode, start_pos, end_of_last_block);
         for (i = 0; i < num_pages; i++) {
                 struct page *p = pages[i];
@@ -155,9 +137,6 @@ static noinline int dirty_and_release_pages(struct btrfs_trans_handle *trans,
                  * at this time.
                  */
         }
-        err = btrfs_end_transaction(trans, root);
-out_unlock:
-        unlock_extent(io_tree, start_pos, end_of_last_block, GFP_NOFS);
         return err;
 }
 
@@ -189,18 +168,18 @@ int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end,
                 if (!split2)
                         split2 = alloc_extent_map(GFP_NOFS);
 
-                spin_lock(&em_tree->lock);
+                write_lock(&em_tree->lock);
                 em = lookup_extent_mapping(em_tree, start, len);
                 if (!em) {
-                        spin_unlock(&em_tree->lock);
+                        write_unlock(&em_tree->lock);
                         break;
                 }
                 flags = em->flags;
                 if (skip_pinned && test_bit(EXTENT_FLAG_PINNED, &em->flags)) {
-                        spin_unlock(&em_tree->lock);
                         if (em->start <= start &&
                             (!testend || em->start + em->len >= start + len)) {
                                 free_extent_map(em);
+                                write_unlock(&em_tree->lock);
                                 break;
                         }
                         if (start < em->start) {
@@ -210,6 +189,7 @@ int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end,
                                 start = em->start + em->len;
                         }
                         free_extent_map(em);
+                        write_unlock(&em_tree->lock);
                         continue;
                 }
                 compressed = test_bit(EXTENT_FLAG_COMPRESSED, &em->flags);
@@ -260,7 +240,7 @@ int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end,
                         free_extent_map(split);
                         split = NULL;
                 }
-                spin_unlock(&em_tree->lock);
+                write_unlock(&em_tree->lock);
 
                 /* once for us */
                 free_extent_map(em);
@@ -289,7 +269,7 @@ int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end,
 noinline int btrfs_drop_extents(struct btrfs_trans_handle *trans,
                        struct btrfs_root *root, struct inode *inode,
                        u64 start, u64 end, u64 locked_end,
-                       u64 inline_limit, u64 *hint_byte)
+                       u64 inline_limit, u64 *hint_byte, int drop_cache)
 {
         u64 extent_end = 0;
         u64 search_start = start;
@@ -314,7 +294,8 @@ noinline int btrfs_drop_extents(struct btrfs_trans_handle *trans,
         int ret;
 
         inline_limit = 0;
-        btrfs_drop_extent_cache(inode, start, end - 1, 0);
+        if (drop_cache)
+                btrfs_drop_extent_cache(inode, start, end - 1, 0);
 
         path = btrfs_alloc_path();
         if (!path)