diff options
| author | Tejun Heo <htejun@gmail.com> | 2007-06-11 05:04:01 (GMT) |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2007-06-12 23:08:47 (GMT) |
| commit | dd14cbc994709a1c5a64ed3621f583c49a27e521 (patch) | |
| tree | e48d38b7450661907c7b75490504c7f70b04d6cc /mm/vmscan.c | |
| parent | 6aa054aadfea613a437ad0b15d38eca2b963fc0a (diff) | |
| download | linux-fsl-qoriq-dd14cbc994709a1c5a64ed3621f583c49a27e521.tar.xz | |
sysfs: fix race condition around sd->s_dentry, take#2
Allowing attribute and symlink dentries to be reclaimed means
sd->s_dentry can change dynamically. However, updates to the field
are unsynchronized leading to race conditions. This patch adds
sysfs_lock and use it to synchronize updates to sd->s_dentry.
Due to the locking around ->d_iput, the check in sysfs_drop_dentry()
is complex. sysfs_lock only protect sd->s_dentry pointer itself. The
validity of the dentry is protected by dcache_lock, so whether dentry
is alive or not can only be tested while holding both locks.
This is minimal backport of sysfs_drop_dentry() rewrite in devel
branch.
Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'mm/vmscan.c')
0 files changed, 0 insertions, 0 deletions