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-rw-r--r--fs/fat/inode.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/fat/inode.c b/fs/fat/inode.c
index 6b74d09adbe5..de0004fe6e00 100644
--- a/fs/fat/inode.c
+++ b/fs/fat/inode.c
@@ -202,9 +202,9 @@ static sector_t _fat_bmap(struct address_space *mapping, sector_t block)
202 sector_t blocknr; 202 sector_t blocknr;
203 203
204 /* fat_get_cluster() assumes the requested blocknr isn't truncated. */ 204 /* fat_get_cluster() assumes the requested blocknr isn't truncated. */
205 mutex_lock(&mapping->host->i_mutex); 205 down_read(&mapping->host->i_alloc_sem);
206 blocknr = generic_block_bmap(mapping, block, fat_get_block); 206 blocknr = generic_block_bmap(mapping, block, fat_get_block);
207 mutex_unlock(&mapping->host->i_mutex); 207 up_read(&mapping->host->i_alloc_sem);
208 208
209 return blocknr; 209 return blocknr;
210} 210}