quota: Add quota reservation support

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Delayed allocation defers the block allocation at the dirty pages
flush-out time, doing quota charge/check at that time is too late.
But we can't charge the quota blocks until blocks are really allocated,
otherwise users could get overcharged after reboot from system crash.

This patch adds quota reservation for delayed allocation. Quota blocks
are reserved in memory, inode and quota won't gets dirtied until later
block allocation time.

Signed-off-by: Mingming Cao <cmm@us.ibm.com>
Signed-off-by: Jan Kara <jack@suse.cz>

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This commit is contained in:

Mingming Cao 2009-01-13 16:43:09 +01:00 • committed by Jan Kara

parent 8e0ee43bc2

commit f18df22899

3 changed files with 110 additions and 31 deletions

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119

fs/dquot.c

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3

include/linux/quota.h

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21

include/linux/quotaops.h

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