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-rw-r--r--fs/fat/inode.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/fs/fat/inode.c b/fs/fat/inode.c
index 0da04e6d1e3..be88208b83a 100644
--- a/fs/fat/inode.c
+++ b/fs/fat/inode.c
@@ -199,7 +199,14 @@ static ssize_t fat_direct_IO(int rw, struct kiocb *iocb,
static sector_t _fat_bmap(struct address_space *mapping, sector_t block)
{
- return generic_block_bmap(mapping, block, fat_get_block);
+ sector_t blocknr;
+
+ /* fat_get_cluster() assumes the requested blocknr isn't truncated. */
+ mutex_lock(&mapping->host->i_mutex);
+ blocknr = generic_block_bmap(mapping, block, fat_get_block);
+ mutex_unlock(&mapping->host->i_mutex);
+
+ return blocknr;
}
static const struct address_space_operations fat_aops = {