summaryrefslogtreecommitdiff
path: root/fs/namei.c
diff options
context:
space:
mode:
authorLinus Torvalds <torvalds@linux-foundation.org>2014-09-15 04:37:36 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2014-09-15 04:37:36 +0400
commit83373f702829dd9f6dcc56d275978d986fafee48 (patch)
tree6e816715ce2e9ea73da8b8462953262f47460897 /fs/namei.c
parent9226b5b440f2b4fbb3b797f3cb74a9a627220660 (diff)
parent4023bfc9f351a7994fb6a7d515476c320f94a574 (diff)
downloadlinux-83373f702829dd9f6dcc56d275978d986fafee48.tar.xz
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Pull vfs fixes from Al Viro: "double iput() on failure exit in lustre, racy removal of spliced dentries from ->s_anon in __d_materialise_dentry() plus a bunch of assorted RCU pathwalk fixes" The RCU pathwalk fixes end up fixing a couple of cases where we incorrectly dropped out of RCU walking, due to incorrect initialization and testing of the sequence locks in some corner cases. Since dropping out of RCU walk mode forces the slow locked accesses, those corner cases slowed down quite dramatically. * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: be careful with nd->inode in path_init() and follow_dotdot_rcu() don't bugger nd->seq on set_root_rcu() from follow_dotdot_rcu() fix bogus read_seqretry() checks introduced in b37199e move the call of __d_drop(anon) into __d_materialise_unique(dentry, anon) [fix] lustre: d_make_root() does iput() on dentry allocation failure
Diffstat (limited to 'fs/namei.c')
-rw-r--r--fs/namei.c52
1 files changed, 32 insertions, 20 deletions
diff --git a/fs/namei.c b/fs/namei.c
index 2be5120b81b3..215e44254c53 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -644,24 +644,22 @@ static int complete_walk(struct nameidata *nd)
static __always_inline void set_root(struct nameidata *nd)
{
- if (!nd->root.mnt)
- get_fs_root(current->fs, &nd->root);
+ get_fs_root(current->fs, &nd->root);
}
static int link_path_walk(const char *, struct nameidata *);
-static __always_inline void set_root_rcu(struct nameidata *nd)
+static __always_inline unsigned set_root_rcu(struct nameidata *nd)
{
- if (!nd->root.mnt) {
- struct fs_struct *fs = current->fs;
- unsigned seq;
+ struct fs_struct *fs = current->fs;
+ unsigned seq, res;
- do {
- seq = read_seqcount_begin(&fs->seq);
- nd->root = fs->root;
- nd->seq = __read_seqcount_begin(&nd->root.dentry->d_seq);
- } while (read_seqcount_retry(&fs->seq, seq));
- }
+ do {
+ seq = read_seqcount_begin(&fs->seq);
+ nd->root = fs->root;
+ res = __read_seqcount_begin(&nd->root.dentry->d_seq);
+ } while (read_seqcount_retry(&fs->seq, seq));
+ return res;
}
static void path_put_conditional(struct path *path, struct nameidata *nd)
@@ -861,7 +859,8 @@ follow_link(struct path *link, struct nameidata *nd, void **p)
return PTR_ERR(s);
}
if (*s == '/') {
- set_root(nd);
+ if (!nd->root.mnt)
+ set_root(nd);
path_put(&nd->path);
nd->path = nd->root;
path_get(&nd->root);
@@ -1138,13 +1137,15 @@ static bool __follow_mount_rcu(struct nameidata *nd, struct path *path,
*/
*inode = path->dentry->d_inode;
}
- return read_seqretry(&mount_lock, nd->m_seq) &&
+ return !read_seqretry(&mount_lock, nd->m_seq) &&
!(path->dentry->d_flags & DCACHE_NEED_AUTOMOUNT);
}
static int follow_dotdot_rcu(struct nameidata *nd)
{
- set_root_rcu(nd);
+ struct inode *inode = nd->inode;
+ if (!nd->root.mnt)
+ set_root_rcu(nd);
while (1) {
if (nd->path.dentry == nd->root.dentry &&
@@ -1156,6 +1157,7 @@ static int follow_dotdot_rcu(struct nameidata *nd)
struct dentry *parent = old->d_parent;
unsigned seq;
+ inode = parent->d_inode;
seq = read_seqcount_begin(&parent->d_seq);
if (read_seqcount_retry(&old->d_seq, nd->seq))
goto failed;
@@ -1165,6 +1167,7 @@ static int follow_dotdot_rcu(struct nameidata *nd)
}
if (!follow_up_rcu(&nd->path))
break;
+ inode = nd->path.dentry->d_inode;
nd->seq = read_seqcount_begin(&nd->path.dentry->d_seq);
}
while (d_mountpoint(nd->path.dentry)) {
@@ -1174,11 +1177,12 @@ static int follow_dotdot_rcu(struct nameidata *nd)
break;
nd->path.mnt = &mounted->mnt;
nd->path.dentry = mounted->mnt.mnt_root;
+ inode = nd->path.dentry->d_inode;
nd->seq = read_seqcount_begin(&nd->path.dentry->d_seq);
- if (!read_seqretry(&mount_lock, nd->m_seq))
+ if (read_seqretry(&mount_lock, nd->m_seq))
goto failed;
}
- nd->inode = nd->path.dentry->d_inode;
+ nd->inode = inode;
return 0;
failed:
@@ -1257,7 +1261,8 @@ static void follow_mount(struct path *path)
static void follow_dotdot(struct nameidata *nd)
{
- set_root(nd);
+ if (!nd->root.mnt)
+ set_root(nd);
while(1) {
struct dentry *old = nd->path.dentry;
@@ -1853,7 +1858,7 @@ static int path_init(int dfd, const char *name, unsigned int flags,
if (*name=='/') {
if (flags & LOOKUP_RCU) {
rcu_read_lock();
- set_root_rcu(nd);
+ nd->seq = set_root_rcu(nd);
} else {
set_root(nd);
path_get(&nd->root);
@@ -1904,7 +1909,14 @@ static int path_init(int dfd, const char *name, unsigned int flags,
}
nd->inode = nd->path.dentry->d_inode;
- return 0;
+ if (!(flags & LOOKUP_RCU))
+ return 0;
+ if (likely(!read_seqcount_retry(&nd->path.dentry->d_seq, nd->seq)))
+ return 0;
+ if (!(nd->flags & LOOKUP_ROOT))
+ nd->root.mnt = NULL;
+ rcu_read_unlock();
+ return -ECHILD;
}
static inline int lookup_last(struct nameidata *nd, struct path *path)