From 582686915803e34adc8fdcd90bff7ca7f6a42221 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Fri, 24 Jun 2011 14:29:40 -0400 Subject: 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 Signed-off-by: Al Viro --- fs/fat/file.c | 2 ++ 1 file changed, 2 insertions(+) (limited to 'fs/fat/file.c') diff --git a/fs/fat/file.c b/fs/fat/file.c index 7018e1d8902d..a4a3a3c06436 100644 --- a/fs/fat/file.c +++ b/fs/fat/file.c @@ -429,8 +429,10 @@ int fat_setattr(struct dentry *dentry, struct iattr *attr) } if (attr->ia_valid & ATTR_SIZE) { + down_write(&MSDOS_I(inode)->truncate_lock); truncate_setsize(inode, attr->ia_size); fat_truncate_blocks(inode, attr->ia_size); + up_write(&MSDOS_I(inode)->truncate_lock); } setattr_copy(inode, attr); -- cgit v1.2.3