Tejun Heo dd14cbc994 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>		2007-06-12 16:08:47 -07:00
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bin.c
dir.c	sysfs: fix race condition around sd->s_dentry, take#2	2007-06-12 16:08:47 -07:00
file.c
group.c
inode.c	sysfs: fix race condition around sd->s_dentry, take#2	2007-06-12 16:08:47 -07:00
Makefile
mount.c
symlink.c
sysfs.h	sysfs: fix race condition around sd->s_dentry, take#2	2007-06-12 16:08:47 -07:00