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author | Pavel Emelyanov <xemul@openvz.org> | 2008-06-06 05:46:26 (GMT) |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-06-06 18:29:11 (GMT) |
commit | cc9cb219aac24ffc711566c8f372c2b3a3bf840f (patch) | |
tree | efa678227596922a00b2a7744c33707041c78316 /fs/block_dev.c | |
parent | b66862f7663332aa1ecb3ebda4086360ddb8befc (diff) | |
download | linux-cc9cb219aac24ffc711566c8f372c2b3a3bf840f.tar.xz |
devscgroup: relax task to dev_cgroup conversion
Two functions, that need to get a device_cgroup from a task (they are
devcgroup_inode_permission and devcgroup_inode_mknod) make it in a strange
way:
They get a css_set from task, then a subsys_state from css_set, then a
cgroup from the state and then a subsys_state again from the cgroup.
Besides, the devices_subsys_id is read from memory, whilst there's a
enum-ed constant for it.
Optimize this part a bit:
1. Get the subsys_stats form the task and be done - no 2 extra
dereferences,
2. Use the device_subsys_id constant, not the value from memory
(i.e. one less dereference).
Found while preparing 2.6.26 OpenVZ port.
Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Acked-by: Serge Hallyn <serue@us.ibm.com>
Acked-by: Paul Menage <menage@google.com>
Cc: Balbir Singh <balbir@in.ibm.com>
Cc: James Morris <jmorris@namei.org>
Cc: Chris Wright <chrisw@sous-sol.org>
Cc: Stephen Smalley <sds@tycho.nsa.gov>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/block_dev.c')
0 files changed, 0 insertions, 0 deletions