xfs: Fix oops on IO error during xlog_recover_process_iunlinks() (d97d32ed) · Commits · 戴 / test

When an IO error happens during inode deletion run from xlog_recover_process_iunlinks() filesystem gets shutdown. Thus any subsequent attempt to read buffers fails. Code in xlog_recover_process_iunlinks() does not count with the fact that read of a buffer which was read a while ago can really fail which results in the oops on agi = XFS_BUF_TO_AGI(agibp); Fix the problem by cleaning up the buffer handling in xlog_recover_process_iunlinks() as suggested by Dave Chinner. We release buffer lock but keep buffer reference to AG buffer. That is enough for buffer to stay pinned in memory and we don't have to call xfs_read_agi() all the time. CC: stable@kernel.org Signed-off-by:

Jan Kara <jack@suse.cz> Reviewed-by:

Dave Chinner <dchinner@redhat.com> Signed-off-by:

Ben Myers <bpm@sgi.com>

fs/xfs/xfs_log_recover.c

+11 −22

Original line number	Diff line number	Diff line
		@@ -3161,37 +3161,26 @@ xlog_recover_process_iunlinks(
		*/
		continue;
		}
		/*
		* Unlock the buffer so that it can be acquired in the normal
		* course of the transaction to truncate and free each inode.
		* Because we are not racing with anyone else here for the AGI
		* buffer, we don't even need to hold it locked to read the
		* initial unlinked bucket entries out of the buffer. We keep
		* buffer reference though, so that it stays pinned in memory
		* while we need the buffer.
		*/
		agi = XFS_BUF_TO_AGI(agibp);
		xfs_buf_unlock(agibp);

		for (bucket = 0; bucket < XFS_AGI_UNLINKED_BUCKETS; bucket++) {
		agino = be32_to_cpu(agi->agi_unlinked[bucket]);
		while (agino != NULLAGINO) {
		/*
		* Release the agi buffer so that it can
		* be acquired in the normal course of the
		* transaction to truncate and free the inode.
		*/
		xfs_buf_relse(agibp);

		agino = xlog_recover_process_one_iunlink(mp,
		agno, agino, bucket);

		/*
		* Reacquire the agibuffer and continue around
		* the loop. This should never fail as we know
		* the buffer was good earlier on.
		*/
		error = xfs_read_agi(mp, NULL, agno, &agibp);
		ASSERT(error == 0);
		agi = XFS_BUF_TO_AGI(agibp);
		}
		}

		/*
		* Release the buffer for the current agi so we can
		* go on to the next one.
		*/
		xfs_buf_relse(agibp);
		xfs_buf_rele(agibp);
		}

		mp->m_dmevmask = mp_dmevmask;

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