Merge branch 'oprofile-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...

[deliverable/linux.git] / fs / ext4 / extents.c

diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index e4033215834074fe724987098aac17d36ab3ac85..e3a55eb8b26a5df9cc41fb5efd79e23fc275da22 100644 (file)
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -1841,11 +1841,13 @@ ext4_ext_put_in_cache(struct inode *inode, ext4_lblk_t block,
 {
        struct ext4_ext_cache *cex;
        BUG_ON(len == 0);
+       spin_lock(&EXT4_I(inode)->i_block_reservation_lock);
        cex = &EXT4_I(inode)->i_cached_extent;
        cex->ec_type = type;
        cex->ec_block = block;
        cex->ec_len = len;
        cex->ec_start = start;
+       spin_unlock(&EXT4_I(inode)->i_block_reservation_lock);
 }
 
 /*
@@ -1902,12 +1904,17 @@ ext4_ext_in_cache(struct inode *inode, ext4_lblk_t block,
                        struct ext4_extent *ex)
 {
        struct ext4_ext_cache *cex;
+       int ret = EXT4_EXT_CACHE_NO;
 
+       /* 
+        * We borrow i_block_reservation_lock to protect i_cached_extent
+        */
+       spin_lock(&EXT4_I(inode)->i_block_reservation_lock);
        cex = &EXT4_I(inode)->i_cached_extent;
 
        /* has cache valid data? */
        if (cex->ec_type == EXT4_EXT_CACHE_NO)
-               return EXT4_EXT_CACHE_NO;
+               goto errout;
 
        BUG_ON(cex->ec_type != EXT4_EXT_CACHE_GAP &&
                        cex->ec_type != EXT4_EXT_CACHE_EXTENT);
@@ -1918,11 +1925,11 @@ ext4_ext_in_cache(struct inode *inode, ext4_lblk_t block,
                ext_debug("%u cached by %u:%u:%llu\n",
                                block,
                                cex->ec_block, cex->ec_len, cex->ec_start);
-               return cex->ec_type;
+               ret = cex->ec_type;
        }
-
-       /* not in cache */
-       return EXT4_EXT_CACHE_NO;
+errout:
+       spin_unlock(&EXT4_I(inode)->i_block_reservation_lock);
+       return ret;
 }
 
 /*
@@ -2875,6 +2882,8 @@ int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
                                if (allocated > max_blocks)
                                        allocated = max_blocks;
                                set_buffer_unwritten(bh_result);
+                               bh_result->b_bdev = inode->i_sb->s_bdev;
+                               bh_result->b_blocknr = newblock;
                                goto out2;
                        }