Revision - 76d771b - xfs: use per-AG reservations for the finobt - origin: https://github.com/torvalds/linux

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Revision 76d771b4cbe33c581bd6ca2710c120be51172440 authored by Christoph Hellwig on 25 January 2017, 15:49:35 UTC, committed by Darrick J. Wong on 25 January 2017, 15:49:35 UTC

xfs: use per-AG reservations for the finobt

Currently we try to rely on the global reserved block pool for block
allocations for the free inode btree, but I have customer reports
(fairly complex workload, need to find an easier reproducer) where that
is not enough as the AG where we free an inode that requires a new
finobt block is entirely full.  This causes us to cancel a dirty
transaction and thus a file system shutdown.

I think the right way to guard against this is to treat the finot the same
way as the refcount btree and have a per-AG reservations for the possible
worst case size of it, and the patch below implements that.

Note that this could increase mount times with large finobt trees.  In
an ideal world we would have added a field for the number of finobt
fields to the AGI, similar to what we did for the refcount blocks.
We should do add it next time we rev the AGI or AGF format by adding
new fields.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>

1 parent 4dfa2b8

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Tip revision: 76d771b4cbe33c581bd6ca2710c120be51172440 authored by Christoph Hellwig on 25 January 2017, 15:49:35 UTC
xfs: use per-AG reservations for the finobt

Tip revision: 76d771b

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usr
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.cocciconfig	-rw-r--r--	59 bytes
.get_maintainer.ignore	-rw-r--r--	31 bytes
.gitattributes	-rw-r--r--	30 bytes
.gitignore	-rw-r--r--	1.3 KB
.mailmap	-rw-r--r--	7.7 KB
COPYING	-rw-r--r--	18.3 KB
CREDITS	-rw-r--r--	96.0 KB
Kbuild	-rw-r--r--	2.8 KB
Kconfig	-rw-r--r--	252 bytes
MAINTAINERS	-rw-r--r--	382.5 KB
Makefile	-rw-r--r--	57.6 KB
README	-rw-r--r--	722 bytes

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xfs: use per-AG reservations for the finobt

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