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author | Mark Tinguely <tinguely@sgi.com> | 2012-07-24 15:59:19 (GMT) |
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committer | Ben Myers <bpm@sgi.com> | 2012-07-29 21:34:19 (GMT) |
commit | 9a57fa8ee7c29e11c2a29ce058573ba99157eda7 (patch) | |
tree | 3fc564a3ad53b16a6604aa89ae3d4d26e07e2d38 /lib/Makefile | |
parent | 8375f922aaa6e7a880022529202fb486315568c3 (diff) | |
download | linux-9a57fa8ee7c29e11c2a29ce058573ba99157eda7.tar.xz |
xfs: wait for the write the superblock on unmount
v2: Add the xfs_buf_lock to xfs_quiesce_attr().
Add explaination why xfs_buf_lock() is used to wait for write.
xfs_wait_buftarg() does not wait for the completion of the write of the
uncached superblock. This write can race with the shutdown of the log
and causes a panic if the write does not win the race.
During the log write, xfsaild_push() will lock the buffer and set the
XBF_ASYNC flag. Because the XBF_FLAG is set, complete() is not performed
on the buffer's iowait entry, we cannot call xfs_buf_iowait() to wait
for the write to complete. The buffer's lock is held until the write is
complete, so we can block on a xfs_buf_lock() request to be notified
that the write is complete.
Signed-off-by: Mark Tinguely <tinguely@sgi.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Ben Myers <bpm@sgi.com>
Diffstat (limited to 'lib/Makefile')
0 files changed, 0 insertions, 0 deletions