Btrfs: add all ioctl checks before user change for quota operations

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Since all the quota configurations are loaded in memory, and we can
have ioctl checks before operating in the disk. It is safe to do such
things because qgroup_ioctl_lock is held outside.

Without these extra checks firstly, it should be ok to do user change
for quota operations. For example:

if we want to add an existed qgroup, we will do:
	->add_qgroup_item()
		->add_qgroup_rb()

add_qgroup_item() will return -EEXIST to us, however, qgroups are all
in memory, why not check them in memory firstly.

Signed-off-by: Wang Shilong <wangsl-fnst@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>

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Wang Shilong 2013-04-17 14:49:51 +00:00 • committed by Josef Bacik

parent 3c97185c65

commit 534e6623b7

1 changed files with 41 additions and 5 deletions

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fs/btrfs/qgroup.c

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