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| author | Jan Kara <jack@suse.cz> | 2017-06-13 16:20:25 +0200 |
|---|---|---|
| committer | Jan Kara <jack@suse.cz> | 2017-06-14 11:21:01 +0200 |
| commit | f2e95355891153f66d4156bf3a142c6489cd78c6 (patch) | |
| tree | 1ed9e9466224522d8a6aaf2b0336b071f9a9324b /fs/udf/inode.c | |
| parent | 146c4ad6ec034a1fbfbf90ba76cb69b6504c374a (diff) | |
| download | linux-f2e95355891153f66d4156bf3a142c6489cd78c6.tar.gz linux-f2e95355891153f66d4156bf3a142c6489cd78c6.tar.bz2 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 'fs/udf/inode.c')
| -rw-r--r-- | fs/udf/inode.c | 4 |
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); } |