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authorAl Viro <viro@zeniv.linux.org.uk>2012-03-15 22:48:55 +0400
committerAl Viro <viro@zeniv.linux.org.uk>2012-03-21 05:29:42 +0400
commit82234e61a8fc75599f29026c0805fc0cfe2a6c87 (patch)
tree6ee40363b259ed5de9d28b12f13646d6748214e2 /fs/fs_struct.c
parent3ee05ed0679f29ab19727067ff7c14f0c257fa9a (diff)
downloadlinux-82234e61a8fc75599f29026c0805fc0cfe2a6c87.tar.xz
vfs: take path_get_longterm() out of write_seqcount scope
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/fs_struct.c')
-rw-r--r--fs/fs_struct.c27
1 files changed, 15 insertions, 12 deletions
diff --git a/fs/fs_struct.c b/fs/fs_struct.c
index 27114b413622..6324c4274959 100644
--- a/fs/fs_struct.c
+++ b/fs/fs_struct.c
@@ -26,11 +26,11 @@ void set_fs_root(struct fs_struct *fs, struct path *path)
{
struct path old_root;
+ path_get_longterm(path);
spin_lock(&fs->lock);
write_seqcount_begin(&fs->seq);
old_root = fs->root;
fs->root = *path;
- path_get_longterm(path);
write_seqcount_end(&fs->seq);
spin_unlock(&fs->lock);
if (old_root.dentry)
@@ -45,11 +45,11 @@ void set_fs_pwd(struct fs_struct *fs, struct path *path)
{
struct path old_pwd;
+ path_get_longterm(path);
spin_lock(&fs->lock);
write_seqcount_begin(&fs->seq);
old_pwd = fs->pwd;
fs->pwd = *path;
- path_get_longterm(path);
write_seqcount_end(&fs->seq);
spin_unlock(&fs->lock);
@@ -57,6 +57,14 @@ void set_fs_pwd(struct fs_struct *fs, struct path *path)
path_put_longterm(&old_pwd);
}
+static inline int replace_path(struct path *p, const struct path *old, const struct path *new)
+{
+ if (likely(p->dentry != old->dentry || p->mnt != old->mnt))
+ return 0;
+ *p = *new;
+ return 1;
+}
+
void chroot_fs_refs(struct path *old_root, struct path *new_root)
{
struct task_struct *g, *p;
@@ -68,21 +76,16 @@ void chroot_fs_refs(struct path *old_root, struct path *new_root)
task_lock(p);
fs = p->fs;
if (fs) {
+ int hits = 0;
spin_lock(&fs->lock);
write_seqcount_begin(&fs->seq);
- if (fs->root.dentry == old_root->dentry
- && fs->root.mnt == old_root->mnt) {
- path_get_longterm(new_root);
- fs->root = *new_root;
+ hits += replace_path(&fs->root, old_root, new_root);
+ hits += replace_path(&fs->pwd, old_root, new_root);
+ write_seqcount_end(&fs->seq);
+ while (hits--) {
count++;
- }
- if (fs->pwd.dentry == old_root->dentry
- && fs->pwd.mnt == old_root->mnt) {
path_get_longterm(new_root);
- fs->pwd = *new_root;
- count++;
}
- write_seqcount_end(&fs->seq);
spin_unlock(&fs->lock);
}
task_unlock(p);