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authorDave Chinner <dchinner@redhat.com>2019-09-05 17:32:52 -0700
committerDarrick J. Wong <darrick.wong@oracle.com>2019-09-05 21:36:13 -0700
commit14e15f1bcd738dc13dd7c1e78e4800e8bc577980 (patch)
tree00359f3869504c8a9ef1ecc21744eef6df75584b /arch/riscv/boot/dts/sifive/fu540-c000.dtsi
parent0383f543d8708ba0738e38c7f530f998256b8190 (diff)
downloadlinux-14e15f1bcd738dc13dd7c1e78e4800e8bc577980.tar.gz
xfs: push the grant head when the log head moves forward
When the log fills up, we can get into the state where the outstanding items in the CIL being committed and aggregated are larger than the range that the reservation grant head tail pushing will attempt to clean. This can result in the tail pushing range being trimmed back to the the log head (l_last_sync_lsn) and so may not actually move the push target at all. When the iclogs associated with the CIL commit finally land, the log head moves forward, and this removes the restriction on the AIL push target. However, if we already have transactions sleeping on the grant head, and there's nothing in the AIL still to flush from the current push target, then nothing will move the tail of the log and trigger a log reservation wakeup. Hence the there is nothing that will trigger xlog_grant_push_ail() to recalculate the AIL push target and start pushing on the AIL again to write back the metadata objects that pin the tail of the log and hence free up space and allow the transaction reservations to be woken and make progress. Hence we need to push on the grant head when we move the log head forward, as this may be the only trigger we have that can move the AIL push target forwards in this situation. Signed-off-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
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