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authorChristoph Hellwig <hch@infradead.org>2011-06-24 22:29:40 +0400
committerAl Viro <viro@zeniv.linux.org.uk>2011-07-21 04:47:44 +0400
commit582686915803e34adc8fdcd90bff7ca7f6a42221 (patch)
tree5a522cb6dbc41eaac987dbf15a2cbae35b2544cc /fs/fat/inode.c
parent8c5dc70aae29d2571c0f461d69b37e4e6e01ff4c (diff)
downloadlinux-582686915803e34adc8fdcd90bff7ca7f6a42221.tar.xz
fat: remove i_alloc_sem abuse
Add a new rw_semaphore to protect bmap against truncate. Previous i_alloc_sem was abused for this, but it's going away in this series. Note that we can't simply use i_mutex, given that the swapon code calls ->bmap under it. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/fat/inode.c')
-rw-r--r--fs/fat/inode.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/fs/fat/inode.c b/fs/fat/inode.c
index cb8d8391ac0b..3decce46c38f 100644
--- 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;
}