1 files changed, 26 insertions, 11 deletions

diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index 2a1cb0979768..e3a55eb8b26a 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -326,11 +326,14 @@ ext4_ext_max_entries(struct inode *inode, int depth)
 
 static int ext4_valid_extent(struct inode *inode, struct ext4_extent *ext)
 {
-        ext4_fsblk_t block = ext_pblock(ext);
+        ext4_fsblk_t block = ext_pblock(ext), valid_block;
         int len = ext4_ext_get_actual_len(ext);
         struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
-        if (unlikely(block < le32_to_cpu(es->s_first_data_block) ||
-                        ((block + len) > ext4_blocks_count(es))))
+
+        valid_block = le32_to_cpu(es->s_first_data_block) +
+                EXT4_SB(inode->i_sb)->s_gdb_count;
+        if (unlikely(block <= valid_block ||
+                     ((block + len) > ext4_blocks_count(es))))
                 return 0;
         else
                 return 1;
@@ -339,10 +342,13 @@ static int ext4_valid_extent(struct inode *inode, struct ext4_extent *ext)
 static int ext4_valid_extent_idx(struct inode *inode,
                                 struct ext4_extent_idx *ext_idx)
 {
-        ext4_fsblk_t block = idx_pblock(ext_idx);
+        ext4_fsblk_t block = idx_pblock(ext_idx), valid_block;
         struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
-        if (unlikely(block < le32_to_cpu(es->s_first_data_block) ||
-                        (block >= ext4_blocks_count(es))))
+
+        valid_block = le32_to_cpu(es->s_first_data_block) +
+                EXT4_SB(inode->i_sb)->s_gdb_count;
+        if (unlikely(block <= valid_block ||
+                     (block >= ext4_blocks_count(es))))
                 return 0;
         else
                 return 1;
@@ -1835,11 +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);
 }
 
 /*
@@ -1896,12 +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);
@@ -1912,11 +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;
 }
 
 /*
@@ -2869,6 +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;
                         }