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Diffstat (limited to 'fs')
-rw-r--r--fs/namei.c37
1 files changed, 35 insertions, 2 deletions
diff --git a/fs/namei.c b/fs/namei.c
index 998d5316921a..7d694194024a 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -2202,6 +2202,8 @@ static struct file *do_last(struct nameidata *nd, struct path *path,
struct file *filp;
struct inode *inode;
int symlink_ok = 0;
+ struct path save_parent = { .dentry = NULL, .mnt = NULL };
+ bool retried = false;
int error;
nd->flags &= ~LOOKUP_PARENT;
@@ -2267,6 +2269,7 @@ static struct file *do_last(struct nameidata *nd, struct path *path,
if (nd->last.name[nd->last.len])
goto exit;
+retry_lookup:
mutex_lock(&dir->d_inode->i_mutex);
dentry = lookup_hash(nd);
@@ -2349,12 +2352,21 @@ finish_lookup:
return NULL;
}
- path_to_nameidata(path, nd);
+ if ((nd->flags & LOOKUP_RCU) || nd->path.mnt != path->mnt) {
+ path_to_nameidata(path, nd);
+ } else {
+ save_parent.dentry = nd->path.dentry;
+ save_parent.mnt = mntget(path->mnt);
+ nd->path.dentry = path->dentry;
+
+ }
nd->inode = inode;
/* Why this, you ask? _Now_ we might have grown LOOKUP_JUMPED... */
error = complete_walk(nd);
- if (error)
+ if (error) {
+ path_put(&save_parent);
return ERR_PTR(error);
+ }
error = -EISDIR;
if ((open_flag & O_CREAT) && S_ISDIR(nd->inode->i_mode))
goto exit;
@@ -2377,6 +2389,20 @@ common:
if (error)
goto exit;
filp = nameidata_to_filp(nd);
+ if (filp == ERR_PTR(-EOPENSTALE) && save_parent.dentry && !retried) {
+ BUG_ON(save_parent.dentry != dir);
+ path_put(&nd->path);
+ nd->path = save_parent;
+ nd->inode = dir->d_inode;
+ save_parent.mnt = NULL;
+ save_parent.dentry = NULL;
+ if (want_write) {
+ mnt_drop_write(nd->path.mnt);
+ want_write = 0;
+ }
+ retried = true;
+ goto retry_lookup;
+ }
if (!IS_ERR(filp)) {
error = ima_file_check(filp, op->acc_mode);
if (error) {
@@ -2396,6 +2422,7 @@ common:
out:
if (want_write)
mnt_drop_write(nd->path.mnt);
+ path_put(&save_parent);
terminate_walk(nd);
return filp;
@@ -2459,6 +2486,12 @@ out:
if (base)
fput(base);
release_open_intent(nd);
+ if (filp == ERR_PTR(-EOPENSTALE)) {
+ if (flags & LOOKUP_RCU)
+ filp = ERR_PTR(-ECHILD);
+ else
+ filp = ERR_PTR(-ESTALE);
+ }
return filp;
out_filp: