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authorChristoph Hellwig <hch@infradead.org>2011-06-24 14:29:40 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2011-07-20 20:47:44 -0400
commit582686915803e34adc8fdcd90bff7ca7f6a42221 (patch)
tree5a522cb6dbc41eaac987dbf15a2cbae35b2544cc /fs/fat/file.c
parent8c5dc70aae29d2571c0f461d69b37e4e6e01ff4c (diff)
downloadlinux-582686915803e34adc8fdcd90bff7ca7f6a42221.tar.bz2
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/file.c')
-rw-r--r--fs/fat/file.c2
1 files changed, 2 insertions, 0 deletions
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);