tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 *
3 * Copyright (C) 2011 Novell Inc.
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 as published by
7 * the Free Software Foundation.
8 */
9
10#include <linux/kernel.h>
11
12enum ovl_path_type {
13 __OVL_PATH_UPPER = (1 << 0),
14 __OVL_PATH_MERGE = (1 << 1),
15};
16
17#define OVL_TYPE_UPPER(type) ((type) & __OVL_PATH_UPPER)
18#define OVL_TYPE_MERGE(type) ((type) & __OVL_PATH_MERGE)
19
20#define OVL_XATTR_PREFIX XATTR_TRUSTED_PREFIX "overlay."
21#define OVL_XATTR_OPAQUE OVL_XATTR_PREFIX "opaque"
22#define OVL_XATTR_REDIRECT OVL_XATTR_PREFIX "redirect"
23
24#define OVL_ISUPPER_MASK 1UL
25
26static inline int ovl_do_rmdir(struct inode *dir, struct dentry *dentry)
27{
28 int err = vfs_rmdir(dir, dentry);
29 pr_debug("rmdir(%pd2) = %i\n", dentry, err);
30 return err;
31}
32
33static inline int ovl_do_unlink(struct inode *dir, struct dentry *dentry)
34{
35 int err = vfs_unlink(dir, dentry, NULL);
36 pr_debug("unlink(%pd2) = %i\n", dentry, err);
37 return err;
38}
39
40static inline int ovl_do_link(struct dentry *old_dentry, struct inode *dir,
41 struct dentry *new_dentry, bool debug)
42{
43 int err = vfs_link(old_dentry, dir, new_dentry, NULL);
44 if (debug) {
45 pr_debug("link(%pd2, %pd2) = %i\n",
46 old_dentry, new_dentry, err);
47 }
48 return err;
49}
50
51static inline int ovl_do_create(struct inode *dir, struct dentry *dentry,
52 umode_t mode, bool debug)
53{
54 int err = vfs_create(dir, dentry, mode, true);
55 if (debug)
56 pr_debug("create(%pd2, 0%o) = %i\n", dentry, mode, err);
57 return err;
58}
59
60static inline int ovl_do_mkdir(struct inode *dir, struct dentry *dentry,
61 umode_t mode, bool debug)
62{
63 int err = vfs_mkdir(dir, dentry, mode);
64 if (debug)
65 pr_debug("mkdir(%pd2, 0%o) = %i\n", dentry, mode, err);
66 return err;
67}
68
69static inline int ovl_do_mknod(struct inode *dir, struct dentry *dentry,
70 umode_t mode, dev_t dev, bool debug)
71{
72 int err = vfs_mknod(dir, dentry, mode, dev);
73 if (debug) {
74 pr_debug("mknod(%pd2, 0%o, 0%o) = %i\n",
75 dentry, mode, dev, err);
76 }
77 return err;
78}
79
80static inline int ovl_do_symlink(struct inode *dir, struct dentry *dentry,
81 const char *oldname, bool debug)
82{
83 int err = vfs_symlink(dir, dentry, oldname);
84 if (debug)
85 pr_debug("symlink(\"%s\", %pd2) = %i\n", oldname, dentry, err);
86 return err;
87}
88
89static inline int ovl_do_setxattr(struct dentry *dentry, const char *name,
90 const void *value, size_t size, int flags)
91{
92 int err = vfs_setxattr(dentry, name, value, size, flags);
93 pr_debug("setxattr(%pd2, \"%s\", \"%*s\", 0x%x) = %i\n",
94 dentry, name, (int) size, (char *) value, flags, err);
95 return err;
96}
97
98static inline int ovl_do_removexattr(struct dentry *dentry, const char *name)
99{
100 int err = vfs_removexattr(dentry, name);
101 pr_debug("removexattr(%pd2, \"%s\") = %i\n", dentry, name, err);
102 return err;
103}
104
105static inline int ovl_do_rename(struct inode *olddir, struct dentry *olddentry,
106 struct inode *newdir, struct dentry *newdentry,
107 unsigned int flags)
108{
109 int err;
110
111 pr_debug("rename(%pd2, %pd2, 0x%x)\n",
112 olddentry, newdentry, flags);
113
114 err = vfs_rename(olddir, olddentry, newdir, newdentry, NULL, flags);
115
116 if (err) {
117 pr_debug("...rename(%pd2, %pd2, ...) = %i\n",
118 olddentry, newdentry, err);
119 }
120 return err;
121}
122
123static inline int ovl_do_whiteout(struct inode *dir, struct dentry *dentry)
124{
125 int err = vfs_whiteout(dir, dentry);
126 pr_debug("whiteout(%pd2) = %i\n", dentry, err);
127 return err;
128}
129
130static inline struct inode *ovl_inode_real(struct inode *inode, bool *is_upper)
131{
132 unsigned long x = (unsigned long) READ_ONCE(inode->i_private);
133
134 if (is_upper)
135 *is_upper = x & OVL_ISUPPER_MASK;
136
137 return (struct inode *) (x & ~OVL_ISUPPER_MASK);
138}
139
140/* util.c */
141int ovl_want_write(struct dentry *dentry);
142void ovl_drop_write(struct dentry *dentry);
143struct dentry *ovl_workdir(struct dentry *dentry);
144const struct cred *ovl_override_creds(struct super_block *sb);
145struct ovl_entry *ovl_alloc_entry(unsigned int numlower);
146bool ovl_dentry_remote(struct dentry *dentry);
147bool ovl_dentry_weird(struct dentry *dentry);
148enum ovl_path_type ovl_path_type(struct dentry *dentry);
149void ovl_path_upper(struct dentry *dentry, struct path *path);
150void ovl_path_lower(struct dentry *dentry, struct path *path);
151enum ovl_path_type ovl_path_real(struct dentry *dentry, struct path *path);
152struct dentry *ovl_dentry_upper(struct dentry *dentry);
153struct dentry *ovl_dentry_lower(struct dentry *dentry);
154struct dentry *ovl_dentry_real(struct dentry *dentry);
155struct ovl_dir_cache *ovl_dir_cache(struct dentry *dentry);
156void ovl_set_dir_cache(struct dentry *dentry, struct ovl_dir_cache *cache);
157bool ovl_dentry_is_opaque(struct dentry *dentry);
158bool ovl_dentry_is_whiteout(struct dentry *dentry);
159void ovl_dentry_set_opaque(struct dentry *dentry);
160bool ovl_redirect_dir(struct super_block *sb);
161void ovl_clear_redirect_dir(struct super_block *sb);
162const char *ovl_dentry_get_redirect(struct dentry *dentry);
163void ovl_dentry_set_redirect(struct dentry *dentry, const char *redirect);
164void ovl_dentry_update(struct dentry *dentry, struct dentry *upperdentry);
165void ovl_inode_init(struct inode *inode, struct inode *realinode,
166 bool is_upper);
167void ovl_inode_update(struct inode *inode, struct inode *upperinode);
168void ovl_dentry_version_inc(struct dentry *dentry);
169u64 ovl_dentry_version_get(struct dentry *dentry);
170bool ovl_is_whiteout(struct dentry *dentry);
171struct file *ovl_path_open(struct path *path, int flags);
172
173/* namei.c */
174int ovl_path_next(int idx, struct dentry *dentry, struct path *path);
175struct dentry *ovl_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags);
176bool ovl_lower_positive(struct dentry *dentry);
177
178/* readdir.c */
179extern const struct file_operations ovl_dir_operations;
180int ovl_check_empty_dir(struct dentry *dentry, struct list_head *list);
181void ovl_cleanup_whiteouts(struct dentry *upper, struct list_head *list);
182void ovl_cache_free(struct list_head *list);
183int ovl_check_d_type_supported(struct path *realpath);
184void ovl_workdir_cleanup(struct inode *dir, struct vfsmount *mnt,
185 struct dentry *dentry, int level);
186
187/* inode.c */
188int ovl_setattr(struct dentry *dentry, struct iattr *attr);
189int ovl_permission(struct inode *inode, int mask);
190int ovl_xattr_set(struct dentry *dentry, const char *name, const void *value,
191 size_t size, int flags);
192int ovl_xattr_get(struct dentry *dentry, const char *name,
193 void *value, size_t size);
194ssize_t ovl_listxattr(struct dentry *dentry, char *list, size_t size);
195struct posix_acl *ovl_get_acl(struct inode *inode, int type);
196int ovl_open_maybe_copy_up(struct dentry *dentry, unsigned int file_flags);
197int ovl_update_time(struct inode *inode, struct timespec *ts, int flags);
198bool ovl_is_private_xattr(const char *name);
199
200struct inode *ovl_new_inode(struct super_block *sb, umode_t mode, dev_t rdev);
201struct inode *ovl_get_inode(struct super_block *sb, struct inode *realinode);
202static inline void ovl_copyattr(struct inode *from, struct inode *to)
203{
204 to->i_uid = from->i_uid;
205 to->i_gid = from->i_gid;
206 to->i_mode = from->i_mode;
207 to->i_atime = from->i_atime;
208 to->i_mtime = from->i_mtime;
209 to->i_ctime = from->i_ctime;
210}
211
212/* dir.c */
213extern const struct inode_operations ovl_dir_inode_operations;
214struct dentry *ovl_lookup_temp(struct dentry *workdir, struct dentry *dentry);
215struct cattr {
216 dev_t rdev;
217 umode_t mode;
218 const char *link;
219};
220int ovl_create_real(struct inode *dir, struct dentry *newdentry,
221 struct cattr *attr,
222 struct dentry *hardlink, bool debug);
223void ovl_cleanup(struct inode *dir, struct dentry *dentry);
224
225/* copy_up.c */
226int ovl_copy_up(struct dentry *dentry);
227int ovl_copy_up_flags(struct dentry *dentry, int flags);
228int ovl_copy_xattr(struct dentry *old, struct dentry *new);
229int ovl_set_attr(struct dentry *upper, struct kstat *stat);