On Sat, May 19, 2018 at 08:36:19AM -0700, Matthew Wilcox wrote: > On Sat, May 19, 2018 at 08:27:00AM -0700, Darrick J. Wong wrote: > > From: Darrick J. Wong <darrick.wong@xxxxxxxxxx> > > > > In inode_init_always(), we clear the inode mapping flags, which clears > > any retained error (AS_EIO, AS_ENOSC) bits. Unfortunately, we do not > > typo of ENOSPC in case you do a new version Fixed, thanks. > > 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 on a reformatted fs!) in generic/047. > > > > Since we're changing the semantics of inode_init_always, we must also > > change xfs_reinit_inode to retain the writeback error state when we go > > to recover an inode that has been torn down in the vfs but not yet > > disposed of by XFS. > > Don't you also need to preserve inode->i_mapping->flags across the > reinitialisation for the users which aren't yet using ->wb_err? At first I thought (mistakenly) that xfs had been completely converted, but digging further we still use the old filemap_check_errors. It seems reasonable to me that if we're going to resurrect an incore inode then we should try to hang on to AS_EIO/AS_ENOSPC for as long as we can. --D > > +++ b/fs/xfs/xfs_icache.c > > @@ -298,6 +298,7 @@ xfs_reinit_inode( > > uint64_t version = inode_peek_iversion(inode); > > umode_t mode = inode->i_mode; > > dev_t dev = inode->i_rdev; > > + errseq_t old_err = inode->i_mapping->wb_err; > > > > error = inode_init_always(mp->m_super, inode); > > > > @@ -306,6 +307,7 @@ xfs_reinit_inode( > > inode_set_iversion_queried(inode, version); > > inode->i_mode = mode; > > inode->i_rdev = dev; > > + inode->i_mapping->wb_err = old_err; > > return error; > > } > > > -- > To unsubscribe from this list: send the line "unsubscribe linux-xfs" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html
