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cgroup: introduce cgroup_ino()

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mm/memory-failure.c::hwpoison_filter_task() has been reaching into
cgroup to extract the associated ino to be used as a filtering
criterion.  This is an implementation detail which shouldn't be
depended upon from outside cgroup proper and is about to change with
the scheduled kernfs conversion.

This patch introduces a proper interface to determine the associated
ino, cgroup_ino(), and updates hwpoison_filter_task() to use it
instead of reaching directly into cgroup.

Signed-off-by: Tejun Heo <[email protected]>
Acked-by: Li Zefan <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: Wu Fengguang <[email protected]>
This commit is contained in:
Tejun Heo 2014-02-11 11:52:49 -05:00
commit b166492406
3 changed files with 15 additions and 7 deletions
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5
kernel/cgroup.c
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@ -792,7 +792,10 @@ static struct inode *cgroup_new_inode(umode_t mode, struct super_block *sb)
struct inode *inode = new_inode(sb);
if (inode) {
inode->i_ino = get_next_ino();
do {
/* ino 0 is reserved for dummy_root */
inode->i_ino = get_next_ino();
} while (!inode->i_ino);
inode->i_mode = mode;
inode->i_uid = current_fsuid();
inode->i_gid = current_fsgid();