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-rw-r--r--fs/overlayfs/overlayfs.h191
1 files changed, 191 insertions, 0 deletions
diff --git a/fs/overlayfs/overlayfs.h b/fs/overlayfs/overlayfs.h
new file mode 100644
index 000000000000..814bed33dd07
--- /dev/null
+++ b/fs/overlayfs/overlayfs.h
@@ -0,0 +1,191 @@
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
12struct ovl_entry;
13
14enum ovl_path_type {
15 OVL_PATH_PURE_UPPER,
16 OVL_PATH_UPPER,
17 OVL_PATH_MERGE,
18 OVL_PATH_LOWER,
19};
20
21extern const char *ovl_opaque_xattr;
22
23static inline int ovl_do_rmdir(struct inode *dir, struct dentry *dentry)
24{
25 int err = vfs_rmdir(dir, dentry);
26 pr_debug("rmdir(%pd2) = %i\n", dentry, err);
27 return err;
28}
29
30static inline int ovl_do_unlink(struct inode *dir, struct dentry *dentry)
31{
32 int err = vfs_unlink(dir, dentry, NULL);
33 pr_debug("unlink(%pd2) = %i\n", dentry, err);
34 return err;
35}
36
37static inline int ovl_do_link(struct dentry *old_dentry, struct inode *dir,
38 struct dentry *new_dentry, bool debug)
39{
40 int err = vfs_link(old_dentry, dir, new_dentry, NULL);
41 if (debug) {
42 pr_debug("link(%pd2, %pd2) = %i\n",
43 old_dentry, new_dentry, err);
44 }
45 return err;
46}
47
48static inline int ovl_do_create(struct inode *dir, struct dentry *dentry,
49 umode_t mode, bool debug)
50{
51 int err = vfs_create(dir, dentry, mode, true);
52 if (debug)
53 pr_debug("create(%pd2, 0%o) = %i\n", dentry, mode, err);
54 return err;
55}
56
57static inline int ovl_do_mkdir(struct inode *dir, struct dentry *dentry,
58 umode_t mode, bool debug)
59{
60 int err = vfs_mkdir(dir, dentry, mode);
61 if (debug)
62 pr_debug("mkdir(%pd2, 0%o) = %i\n", dentry, mode, err);
63 return err;
64}
65
66static inline int ovl_do_mknod(struct inode *dir, struct dentry *dentry,
67 umode_t mode, dev_t dev, bool debug)
68{
69 int err = vfs_mknod(dir, dentry, mode, dev);
70 if (debug) {
71 pr_debug("mknod(%pd2, 0%o, 0%o) = %i\n",
72 dentry, mode, dev, err);
73 }
74 return err;
75}
76
77static inline int ovl_do_symlink(struct inode *dir, struct dentry *dentry,
78 const char *oldname, bool debug)
79{
80 int err = vfs_symlink(dir, dentry, oldname);
81 if (debug)
82 pr_debug("symlink(\"%s\", %pd2) = %i\n", oldname, dentry, err);
83 return err;
84}
85
86static inline int ovl_do_setxattr(struct dentry *dentry, const char *name,
87 const void *value, size_t size, int flags)
88{
89 int err = vfs_setxattr(dentry, name, value, size, flags);
90 pr_debug("setxattr(%pd2, \"%s\", \"%*s\", 0x%x) = %i\n",
91 dentry, name, (int) size, (char *) value, flags, err);
92 return err;
93}
94
95static inline int ovl_do_removexattr(struct dentry *dentry, const char *name)
96{
97 int err = vfs_removexattr(dentry, name);
98 pr_debug("removexattr(%pd2, \"%s\") = %i\n", dentry, name, err);
99 return err;
100}
101
102static inline int ovl_do_rename(struct inode *olddir, struct dentry *olddentry,
103 struct inode *newdir, struct dentry *newdentry,
104 unsigned int flags)
105{
106 int err;
107
108 pr_debug("rename2(%pd2, %pd2, 0x%x)\n",
109 olddentry, newdentry, flags);
110
111 err = vfs_rename(olddir, olddentry, newdir, newdentry, NULL, flags);
112
113 if (err) {
114 pr_debug("...rename2(%pd2, %pd2, ...) = %i\n",
115 olddentry, newdentry, err);
116 }
117 return err;
118}
119
120static inline int ovl_do_whiteout(struct inode *dir, struct dentry *dentry)
121{
122 int err = vfs_whiteout(dir, dentry);
123 pr_debug("whiteout(%pd2) = %i\n", dentry, err);
124 return err;
125}
126
127enum ovl_path_type ovl_path_type(struct dentry *dentry);
128u64 ovl_dentry_version_get(struct dentry *dentry);
129void ovl_dentry_version_inc(struct dentry *dentry);
130void ovl_path_upper(struct dentry *dentry, struct path *path);
131void ovl_path_lower(struct dentry *dentry, struct path *path);
132enum ovl_path_type ovl_path_real(struct dentry *dentry, struct path *path);
133struct dentry *ovl_dentry_upper(struct dentry *dentry);
134struct dentry *ovl_dentry_lower(struct dentry *dentry);
135struct dentry *ovl_dentry_real(struct dentry *dentry);
136struct dentry *ovl_entry_real(struct ovl_entry *oe, bool *is_upper);
137struct ovl_dir_cache *ovl_dir_cache(struct dentry *dentry);
138void ovl_set_dir_cache(struct dentry *dentry, struct ovl_dir_cache *cache);
139struct dentry *ovl_workdir(struct dentry *dentry);
140int ovl_want_write(struct dentry *dentry);
141void ovl_drop_write(struct dentry *dentry);
142bool ovl_dentry_is_opaque(struct dentry *dentry);
143void ovl_dentry_set_opaque(struct dentry *dentry, bool opaque);
144bool ovl_is_whiteout(struct dentry *dentry);
145void ovl_dentry_update(struct dentry *dentry, struct dentry *upperdentry);
146struct dentry *ovl_lookup(struct inode *dir, struct dentry *dentry,
147 unsigned int flags);
148struct file *ovl_path_open(struct path *path, int flags);
149
150struct dentry *ovl_upper_create(struct dentry *upperdir, struct dentry *dentry,
151 struct kstat *stat, const char *link);
152
153/* readdir.c */
154extern const struct file_operations ovl_dir_operations;
155int ovl_check_empty_dir(struct dentry *dentry, struct list_head *list);
156void ovl_cleanup_whiteouts(struct dentry *upper, struct list_head *list);
157void ovl_cache_free(struct list_head *list);
158
159/* inode.c */
160int ovl_setattr(struct dentry *dentry, struct iattr *attr);
161int ovl_permission(struct inode *inode, int mask);
162int ovl_setxattr(struct dentry *dentry, const char *name,
163 const void *value, size_t size, int flags);
164ssize_t ovl_getxattr(struct dentry *dentry, const char *name,
165 void *value, size_t size);
166ssize_t ovl_listxattr(struct dentry *dentry, char *list, size_t size);
167int ovl_removexattr(struct dentry *dentry, const char *name);
168
169struct inode *ovl_new_inode(struct super_block *sb, umode_t mode,
170 struct ovl_entry *oe);
171static inline void ovl_copyattr(struct inode *from, struct inode *to)
172{
173 to->i_uid = from->i_uid;
174 to->i_gid = from->i_gid;
175}
176
177/* dir.c */
178extern const struct inode_operations ovl_dir_inode_operations;
179struct dentry *ovl_lookup_temp(struct dentry *workdir, struct dentry *dentry);
180int ovl_create_real(struct inode *dir, struct dentry *newdentry,
181 struct kstat *stat, const char *link,
182 struct dentry *hardlink, bool debug);
183void ovl_cleanup(struct inode *dir, struct dentry *dentry);
184
185/* copy_up.c */
186int ovl_copy_up(struct dentry *dentry);
187int ovl_copy_up_one(struct dentry *parent, struct dentry *dentry,
188 struct path *lowerpath, struct kstat *stat,
189 struct iattr *attr);
190int ovl_copy_xattr(struct dentry *old, struct dentry *new);
191int ovl_set_attr(struct dentry *upper, struct kstat *stat);
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-28 02:44:43 -0500