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| author | Darrick J. Wong <darrick.wong@oracle.com> | 2018-05-30 19:43:53 -0700 |
|---|---|---|
| committer | Darrick J. Wong <darrick.wong@oracle.com> | 2018-05-30 19:43:53 -0700 |
| commit | 829bc787c1a0403e4d886296dd4d90c5f9c1744a (patch) | |
| tree | 170ad56bc430b8918c259a578cbef614687e28f6 /fs/inode.c | |
| parent | 021ba8e98fe5c6691b3cc3669faafa02403aa211 (diff) | |
| download | linux-0-day-829bc787c1a0403e4d886296dd4d90c5f9c1744a.tar.gz linux-0-day-829bc787c1a0403e4d886296dd4d90c5f9c1744a.tar.xz | |
fs: clear writeback errors in inode_init_always
In inode_init_always(), we clear the inode mapping flags, which clears
any retained error (AS_EIO, AS_ENOSPC) bits. Unfortunately, we do not
also clear wb_err, which means that old mapping errors can leak through
to new inodes.
This is crucial for the XFS inode allocation path because we recycle old
in-core inodes and we do not want error state from an old file to leak
into the new file. This bug was discovered by running generic/036 and
generic/047 in a loop and noticing that the EIOs generated by the
collision of direct and buffered writes in generic/036 would survive the
remount between 036 and 047, and get reported to the fsyncs (on
different files!) in generic/047.
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Diffstat (limited to 'fs/inode.c')
| -rw-r--r-- | fs/inode.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/inode.c b/fs/inode.c index 13ceb98c3bd3b..3b55391072f3d 100644 --- a/fs/inode.c +++ b/fs/inode.c @@ -178,6 +178,7 @@ int inode_init_always(struct super_block *sb, struct inode *inode) mapping->a_ops = &empty_aops; mapping->host = inode; mapping->flags = 0; + mapping->wb_err = 0; atomic_set(&mapping->i_mmap_writable, 0); mapping_set_gfp_mask(mapping, GFP_HIGHUSER_MOVABLE); mapping->private_data = NULL; |