fat: remove i_alloc_sem abuse

[firefly-linux-kernel-4.4.55.git] / fs / fat / inode.c

diff --git a/fs/fat/inode.c b/fs/fat/inode.c
index cb8d8391ac0bb67c815e45b90127f89a3f6368f5..3decce46c38f867b46ea77c0bba4d547711aba07 100644 (file)
--- a/fs/fat/inode.c
+++ b/fs/fat/inode.c
@@ -224,9 +224,9 @@ static sector_t _fat_bmap(struct address_space *mapping, sector_t block)
        sector_t blocknr;
 
        /* fat_get_cluster() assumes the requested blocknr isn't truncated. */
-       down_read(&mapping->host->i_alloc_sem);
+       down_read(&MSDOS_I(mapping->host)->truncate_lock);
        blocknr = generic_block_bmap(mapping, block, fat_get_block);
-       up_read(&mapping->host->i_alloc_sem);
+       up_read(&MSDOS_I(mapping->host)->truncate_lock);
 
        return blocknr;
 }
@@ -510,6 +510,8 @@ static struct inode *fat_alloc_inode(struct super_block *sb)
        ei = kmem_cache_alloc(fat_inode_cachep, GFP_NOFS);
        if (!ei)
                return NULL;
+
+       init_rwsem(&ei->truncate_lock);
        return &ei->vfs_inode;
 }