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authorJan Kara <jack@suse.cz>2017-06-13 16:20:25 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-07-27 15:08:06 -0700
commitfa67ac18eff4b59b7937c59e821f8b4be812113c (patch)
tree6fd2547f0ad423c249cb8a531b066b6908b4819a /fs/udf
parent9ebfb4fa3ab7ea99b5d93305b10ee3714501b465 (diff)
udf: Fix deadlock between writeback and udf_setsize()
commit f2e95355891153f66d4156bf3a142c6489cd78c6 upstream. 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. Fixes: 7e49b6f2480cb9a9e7322a91592e56a5c85361f5 Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs/udf')
-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 129b18a29c8f..035943501b9f 100644
--- a/fs/udf/inode.c
+++ b/fs/udf/inode.c
@@ -1243,8 +1243,8 @@ 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);
@@ -1261,9 +1261,9 @@ 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);
}