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Diffstat (limited to 'fs/smb/server/vfs.c')
-rw-r--r--fs/smb/server/vfs.c244
1 files changed, 130 insertions, 114 deletions
diff --git a/fs/smb/server/vfs.c b/fs/smb/server/vfs.c
index d3437f6644e3..04539037108c 100644
--- a/fs/smb/server/vfs.c
+++ b/fs/smb/server/vfs.c
@@ -66,13 +66,12 @@ int ksmbd_vfs_lock_parent(struct dentry *parent, struct dentry *child)
return 0;
}
-static int ksmbd_vfs_path_lookup_locked(struct ksmbd_share_config *share_conf,
- char *pathname, unsigned int flags,
- struct path *parent_path,
- struct path *path)
+static int ksmbd_vfs_path_lookup(struct ksmbd_share_config *share_conf,
+ char *pathname, unsigned int flags,
+ struct path *path, bool do_lock)
{
struct qstr last;
- struct filename *filename;
+ struct filename *filename __free(putname) = NULL;
struct path *root_share_path = &share_conf->vfs_path;
int err, type;
struct dentry *d;
@@ -89,51 +88,57 @@ static int ksmbd_vfs_path_lookup_locked(struct ksmbd_share_config *share_conf,
return PTR_ERR(filename);
err = vfs_path_parent_lookup(filename, flags,
- parent_path, &last, &type,
+ path, &last, &type,
root_share_path);
- if (err) {
- putname(filename);
+ if (err)
return err;
- }
if (unlikely(type != LAST_NORM)) {
- path_put(parent_path);
- putname(filename);
+ path_put(path);
return -ENOENT;
}
- err = mnt_want_write(parent_path->mnt);
- if (err) {
- path_put(parent_path);
- putname(filename);
+ if (do_lock) {
+ err = mnt_want_write(path->mnt);
+ if (err) {
+ path_put(path);
+ return -ENOENT;
+ }
+
+ inode_lock_nested(path->dentry->d_inode, I_MUTEX_PARENT);
+ d = lookup_one_qstr_excl(&last, path->dentry, 0);
+
+ if (!IS_ERR(d)) {
+ dput(path->dentry);
+ path->dentry = d;
+ return 0;
+ }
+ inode_unlock(path->dentry->d_inode);
+ mnt_drop_write(path->mnt);
+ path_put(path);
return -ENOENT;
}
- inode_lock_nested(parent_path->dentry->d_inode, I_MUTEX_PARENT);
- d = lookup_one_qstr_excl(&last, parent_path->dentry, 0);
- if (IS_ERR(d))
- goto err_out;
-
+ d = lookup_noperm_unlocked(&last, path->dentry);
+ if (!IS_ERR(d) && d_is_negative(d)) {
+ dput(d);
+ d = ERR_PTR(-ENOENT);
+ }
+ if (IS_ERR(d)) {
+ path_put(path);
+ return -ENOENT;
+ }
+ dput(path->dentry);
path->dentry = d;
- path->mnt = mntget(parent_path->mnt);
if (test_share_config_flag(share_conf, KSMBD_SHARE_FLAG_CROSSMNT)) {
err = follow_down(path, 0);
if (err < 0) {
path_put(path);
- goto err_out;
+ return -ENOENT;
}
}
-
- putname(filename);
return 0;
-
-err_out:
- inode_unlock(d_inode(parent_path->dentry));
- mnt_drop_write(parent_path->mnt);
- path_put(parent_path);
- putname(filename);
- return -ENOENT;
}
void ksmbd_vfs_query_maximal_access(struct mnt_idmap *idmap,
@@ -548,7 +553,8 @@ int ksmbd_vfs_getattr(const struct path *path, struct kstat *stat)
{
int err;
- err = vfs_getattr(path, stat, STATX_BTIME, AT_STATX_SYNC_AS_STAT);
+ err = vfs_getattr(path, stat, STATX_BASIC_STATS | STATX_BTIME,
+ AT_STATX_SYNC_AS_STAT);
if (err)
pr_err("getattr failed, err %d\n", err);
return err;
@@ -765,10 +771,10 @@ retry:
}
rd.old_mnt_idmap = mnt_idmap(old_path->mnt),
- rd.old_dir = d_inode(old_parent),
+ rd.old_parent = old_parent,
rd.old_dentry = old_child,
rd.new_mnt_idmap = mnt_idmap(new_path.mnt),
- rd.new_dir = new_path.dentry->d_inode,
+ rd.new_parent = new_path.dentry,
rd.new_dentry = new_dentry,
rd.flags = flags,
rd.delegated_inode = NULL,
@@ -1198,104 +1204,114 @@ static int ksmbd_vfs_lookup_in_dir(const struct path *dir, char *name,
return ret;
}
-/**
- * ksmbd_vfs_kern_path_locked() - lookup a file and get path info
- * @work: work
- * @name: file path that is relative to share
- * @flags: lookup flags
- * @parent_path: if lookup succeed, return parent_path info
- * @path: if lookup succeed, return path info
- * @caseless: caseless filename lookup
- *
- * Return: 0 on success, otherwise error
- */
-int ksmbd_vfs_kern_path_locked(struct ksmbd_work *work, char *name,
- unsigned int flags, struct path *parent_path,
- struct path *path, bool caseless)
+static
+int __ksmbd_vfs_kern_path(struct ksmbd_work *work, char *filepath,
+ unsigned int flags,
+ struct path *path, bool caseless, bool do_lock)
{
struct ksmbd_share_config *share_conf = work->tcon->share_conf;
+ struct path parent_path;
+ size_t path_len, remain_len;
int err;
- err = ksmbd_vfs_path_lookup_locked(share_conf, name, flags, parent_path,
- path);
- if (!err)
- return 0;
-
- if (caseless) {
- char *filepath;
- size_t path_len, remain_len;
-
- filepath = name;
- path_len = strlen(filepath);
- remain_len = path_len;
-
- *parent_path = share_conf->vfs_path;
- path_get(parent_path);
+retry:
+ err = ksmbd_vfs_path_lookup(share_conf, filepath, flags, path, do_lock);
+ if (!err || !caseless)
+ return err;
- while (d_can_lookup(parent_path->dentry)) {
- char *filename = filepath + path_len - remain_len;
- char *next = strchrnul(filename, '/');
- size_t filename_len = next - filename;
- bool is_last = !next[0];
+ path_len = strlen(filepath);
+ remain_len = path_len;
- if (filename_len == 0)
- break;
+ parent_path = share_conf->vfs_path;
+ path_get(&parent_path);
- err = ksmbd_vfs_lookup_in_dir(parent_path, filename,
- filename_len,
- work->conn->um);
- if (err)
- goto out2;
+ while (d_can_lookup(parent_path.dentry)) {
+ char *filename = filepath + path_len - remain_len;
+ char *next = strchrnul(filename, '/');
+ size_t filename_len = next - filename;
+ bool is_last = !next[0];
- next[0] = '\0';
-
- err = vfs_path_lookup(share_conf->vfs_path.dentry,
- share_conf->vfs_path.mnt,
- filepath,
- flags,
- path);
- if (!is_last)
- next[0] = '/';
- if (err)
- goto out2;
- else if (is_last)
- goto out1;
- path_put(parent_path);
- *parent_path = *path;
+ if (filename_len == 0)
+ break;
- remain_len -= filename_len + 1;
+ err = ksmbd_vfs_lookup_in_dir(&parent_path, filename,
+ filename_len,
+ work->conn->um);
+ path_put(&parent_path);
+ if (err)
+ goto out;
+ if (is_last) {
+ caseless = false;
+ goto retry;
}
+ next[0] = '\0';
+
+ err = vfs_path_lookup(share_conf->vfs_path.dentry,
+ share_conf->vfs_path.mnt,
+ filepath,
+ flags,
+ &parent_path);
+ next[0] = '/';
+ if (err)
+ goto out;
- err = -EINVAL;
-out2:
- path_put(parent_path);
+ remain_len -= filename_len + 1;
}
-out1:
- if (!err) {
- err = mnt_want_write(parent_path->mnt);
- if (err) {
- path_put(path);
- path_put(parent_path);
- return err;
- }
-
- err = ksmbd_vfs_lock_parent(parent_path->dentry, path->dentry);
- if (err) {
- mnt_drop_write(parent_path->mnt);
- path_put(path);
- path_put(parent_path);
- }
- }
+ err = -EINVAL;
+ path_put(&parent_path);
+out:
return err;
}
-void ksmbd_vfs_kern_path_unlock(struct path *parent_path, struct path *path)
+/**
+ * ksmbd_vfs_kern_path() - lookup a file and get path info
+ * @work: work
+ * @filepath: file path that is relative to share
+ * @flags: lookup flags
+ * @path: if lookup succeed, return path info
+ * @caseless: caseless filename lookup
+ *
+ * Perform the lookup, possibly crossing over any mount point.
+ * On return no locks will be held and write-access to filesystem
+ * won't have been checked.
+ * Return: 0 if file was found, otherwise error
+ */
+int ksmbd_vfs_kern_path(struct ksmbd_work *work, char *filepath,
+ unsigned int flags,
+ struct path *path, bool caseless)
+{
+ return __ksmbd_vfs_kern_path(work, filepath, flags, path,
+ caseless, false);
+}
+
+/**
+ * ksmbd_vfs_kern_path_locked() - lookup a file and get path info
+ * @work: work
+ * @filepath: file path that is relative to share
+ * @flags: lookup flags
+ * @path: if lookup succeed, return path info
+ * @caseless: caseless filename lookup
+ *
+ * Perform the lookup, but don't cross over any mount point.
+ * On return the parent of path->dentry will be locked and write-access to
+ * filesystem will have been gained.
+ * Return: 0 on if file was found, otherwise error
+ */
+int ksmbd_vfs_kern_path_locked(struct ksmbd_work *work, char *filepath,
+ unsigned int flags,
+ struct path *path, bool caseless)
{
- inode_unlock(d_inode(parent_path->dentry));
- mnt_drop_write(parent_path->mnt);
+ return __ksmbd_vfs_kern_path(work, filepath, flags, path,
+ caseless, true);
+}
+
+void ksmbd_vfs_kern_path_unlock(struct path *path)
+{
+ /* While lock is still held, ->d_parent is safe */
+ inode_unlock(d_inode(path->dentry->d_parent));
+ mnt_drop_write(path->mnt);
path_put(path);
- path_put(parent_path);
}
struct dentry *ksmbd_vfs_kern_path_create(struct ksmbd_work *work,