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authorJan Kara <jack@suse.cz>2017-06-13 16:20:25 +0200
committerJan Kara <jack@suse.cz>2017-06-14 11:21:01 +0200
commitf2e95355891153f66d4156bf3a142c6489cd78c6 (patch)
tree1ed9e9466224522d8a6aaf2b0336b071f9a9324b /fs/udf/inode.c
parentudf: Use i_size_read() in udf_adinicb_writepage() (diff)
downloadlinux-f2e95355891153f66d4156bf3a142c6489cd78c6.tar.xz
linux-f2e95355891153f66d4156bf3a142c6489cd78c6.zip
udf: Fix deadlock between writeback and udf_setsize()
udf_setsize() called truncate_setsize() with i_data_sem held. Thus truncate_pagecache() called from truncate_setsize() could lock a page under i_data_sem which can deadlock as page lock ranks below i_data_sem - e. g. writeback can hold page lock and try to acquire i_data_sem to map a block. Fix the problem by moving truncate_setsize() calls from under i_data_sem. It is safe for us to change i_size without holding i_data_sem as all the places that depend on i_size being stable already hold inode_lock. CC: stable@vger.kernel.org Fixes: 7e49b6f2480cb9a9e7322a91592e56a5c85361f5 Signed-off-by: Jan Kara <jack@suse.cz>
Diffstat (limited to '')
-rw-r--r--fs/udf/inode.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/udf/inode.c b/fs/udf/inode.c
index 98c510e17203..18fdb9d90812 100644
--- a/fs/udf/inode.c
+++ b/fs/udf/inode.c
@@ -1222,8 +1222,8 @@ int udf_setsize(struct inode *inode, loff_t newsize)
return err;
}
set_size:
- truncate_setsize(inode, newsize);
up_write(&iinfo->i_data_sem);
+ truncate_setsize(inode, newsize);
} else {
if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
down_write(&iinfo->i_data_sem);
@@ -1240,9 +1240,9 @@ set_size:
udf_get_block);
if (err)
return err;
+ truncate_setsize(inode, newsize);
down_write(&iinfo->i_data_sem);
udf_clear_extent_cache(inode);
- truncate_setsize(inode, newsize);
udf_truncate_extents(inode);
up_write(&iinfo->i_data_sem);
}