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xfs: up(ic_sema) if flushing data device fails

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[ Upstream commit 471de20303dda0b67981e06d59cc6c4a83fd2a3c ]

We flush the data device cache before we issue external log IO. If
the flush fails, we shut down the log immediately and return. However,
the iclog->ic_sema is left in a decremented state so let's add an up().
Prior to this patch, xfs/438 would fail consistently when running with
an external log device:

sync
  -> xfs_log_force
  -> xlog_write_iclog
      -> down(&iclog->ic_sema)
      -> blkdev_issue_flush (fail causes us to intiate shutdown)
          -> xlog_force_shutdown
          -> return

unmount
  -> xfs_log_umount
      -> xlog_wait_iclog_completion
          -> down(&iclog->ic_sema) --------> HANG

There is a second early return / shutdown. Make sure the up() happens
for it as well. Also make sure we cleanup the iclog state,
xlog_state_done_syncing, before dropping the iclog lock.

Fixes: b5d721eaae ("xfs: external logs need to flush data device")
Fixes: 842a42d126 ("xfs: shutdown on failure to add page to log bio")
Fixes: 7d839e325a ("xfs: check return codes when flushing block devices")
Signed-off-by: Leah Rumancik <leah.rumancik@gmail.com>
Reviewed-by: "Darrick J. Wong" <djwong@kernel.org>
Signed-off-by: Chandan Babu R <chandanbabu@kernel.org>
Signed-off-by: Leah Rumancik <leah.rumancik@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Leah Rumancik
2025-01-29 10:47:11 -08:00
committed by Greg Kroah-Hartman
parent 67c362b810
commit 323a707978
1 changed files with 12 additions and 11 deletions
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23
fs/xfs/xfs_log.c
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@@ -1891,9 +1891,7 @@ xlog_write_iclog(
* the buffer manually, the code needs to be kept in sync
* with the I/O completion path.
*/
xlog_state_done_syncing(iclog);
up(&iclog->ic_sema);
return;
goto sync;
}
/*
@@ -1923,20 +1921,17 @@ xlog_write_iclog(
* avoid shutdown re-entering this path and erroring out again.
*/
if (log->l_targ != log->l_mp->m_ddev_targp &&
blkdev_issue_flush(log->l_mp->m_ddev_targp->bt_bdev)) {
xlog_force_shutdown(log, SHUTDOWN_LOG_IO_ERROR);
return;
}
blkdev_issue_flush(log->l_mp->m_ddev_targp->bt_bdev))
goto shutdown;
}
if (iclog->ic_flags & XLOG_ICL_NEED_FUA)
iclog->ic_bio.bi_opf |= REQ_FUA;
iclog->ic_flags &= ~(XLOG_ICL_NEED_FLUSH | XLOG_ICL_NEED_FUA);
if (xlog_map_iclog_data(&iclog->ic_bio, iclog->ic_data, count)) {
xlog_force_shutdown(log, SHUTDOWN_LOG_IO_ERROR);
return;
}
if (xlog_map_iclog_data(&iclog->ic_bio, iclog->ic_data, count))
goto shutdown;
if (is_vmalloc_addr(iclog->ic_data))
flush_kernel_vmap_range(iclog->ic_data, count);
@@ -1957,6 +1952,12 @@ xlog_write_iclog(
}
submit_bio(&iclog->ic_bio);
return;
shutdown:
xlog_force_shutdown(log, SHUTDOWN_LOG_IO_ERROR);
sync:
xlog_state_done_syncing(iclog);
up(&iclog->ic_sema);
}
/*