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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi...
[deliverable/linux.git] / fs / overlayfs / overlayfs.h
CommitLineData
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MS		 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 {
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MS		 15 __OVL_PATH_PURE = (1 << 0),
16 __OVL_PATH_UPPER = (1 << 1),
17 __OVL_PATH_MERGE = (1 << 2),
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MS		 18};
19
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MS		 20#define OVL_TYPE_UPPER(type) ((type) & __OVL_PATH_UPPER)
21#define OVL_TYPE_MERGE(type) ((type) & __OVL_PATH_MERGE)
22#define OVL_TYPE_PURE_UPPER(type) ((type) & __OVL_PATH_PURE)
23#define OVL_TYPE_MERGE_OR_LOWER(type) \
24 (OVL_TYPE_MERGE(type) || !OVL_TYPE_UPPER(type))
25
cead89bb 26#define OVL_XATTR_PRE_NAME "trusted.overlay."
27#define OVL_XATTR_PRE_LEN 16
28#define OVL_XATTR_OPAQUE OVL_XATTR_PRE_NAME"opaque"
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MS		 29
30static inline int ovl_do_rmdir(struct inode *dir, struct dentry *dentry)
31{
32 int err = vfs_rmdir(dir, dentry);
33 pr_debug("rmdir(%pd2) = %i\n", dentry, err);
34 return err;
35}
36
37static inline int ovl_do_unlink(struct inode *dir, struct dentry *dentry)
38{
39 int err = vfs_unlink(dir, dentry, NULL);
40 pr_debug("unlink(%pd2) = %i\n", dentry, err);
41 return err;
42}
43
44static inline int ovl_do_link(struct dentry *old_dentry, struct inode *dir,
45 struct dentry *new_dentry, bool debug)
46{
47 int err = vfs_link(old_dentry, dir, new_dentry, NULL);
48 if (debug) {
49 pr_debug("link(%pd2, %pd2) = %i\n",
50 old_dentry, new_dentry, err);
51 }
52 return err;
53}
54
55static inline int ovl_do_create(struct inode *dir, struct dentry *dentry,
56 umode_t mode, bool debug)
57{
58 int err = vfs_create(dir, dentry, mode, true);
59 if (debug)
60 pr_debug("create(%pd2, 0%o) = %i\n", dentry, mode, err);
61 return err;
62}
63
64static inline int ovl_do_mkdir(struct inode *dir, struct dentry *dentry,
65 umode_t mode, bool debug)
66{
67 int err = vfs_mkdir(dir, dentry, mode);
68 if (debug)
69 pr_debug("mkdir(%pd2, 0%o) = %i\n", dentry, mode, err);
70 return err;
71}
72
73static inline int ovl_do_mknod(struct inode *dir, struct dentry *dentry,
74 umode_t mode, dev_t dev, bool debug)
75{
76 int err = vfs_mknod(dir, dentry, mode, dev);
77 if (debug) {
78 pr_debug("mknod(%pd2, 0%o, 0%o) = %i\n",
79 dentry, mode, dev, err);
80 }
81 return err;
82}
83
84static inline int ovl_do_symlink(struct inode *dir, struct dentry *dentry,
85 const char *oldname, bool debug)
86{
87 int err = vfs_symlink(dir, dentry, oldname);
88 if (debug)
89 pr_debug("symlink(\"%s\", %pd2) = %i\n", oldname, dentry, err);
90 return err;
91}
92
93static inline int ovl_do_setxattr(struct dentry *dentry, const char *name,
94 const void *value, size_t size, int flags)
95{
96 int err = vfs_setxattr(dentry, name, value, size, flags);
97 pr_debug("setxattr(%pd2, \"%s\", \"%*s\", 0x%x) = %i\n",
98 dentry, name, (int) size, (char *) value, flags, err);
99 return err;
100}
101
102static inline int ovl_do_removexattr(struct dentry *dentry, const char *name)
103{
104 int err = vfs_removexattr(dentry, name);
105 pr_debug("removexattr(%pd2, \"%s\") = %i\n", dentry, name, err);
106 return err;
107}
108
109static inline int ovl_do_rename(struct inode *olddir, struct dentry *olddentry,
110 struct inode *newdir, struct dentry *newdentry,
111 unsigned int flags)
112{
113 int err;
114
115 pr_debug("rename2(%pd2, %pd2, 0x%x)\n",
116 olddentry, newdentry, flags);
117
118 err = vfs_rename(olddir, olddentry, newdir, newdentry, NULL, flags);
119
120 if (err) {
121 pr_debug("...rename2(%pd2, %pd2, ...) = %i\n",
122 olddentry, newdentry, err);
123 }
124 return err;
125}
126
127static inline int ovl_do_whiteout(struct inode *dir, struct dentry *dentry)
128{
129 int err = vfs_whiteout(dir, dentry);
130 pr_debug("whiteout(%pd2) = %i\n", dentry, err);
131 return err;
132}
133
134enum ovl_path_type ovl_path_type(struct dentry *dentry);
135u64 ovl_dentry_version_get(struct dentry *dentry);
136void ovl_dentry_version_inc(struct dentry *dentry);
137void ovl_path_upper(struct dentry *dentry, struct path *path);
138void ovl_path_lower(struct dentry *dentry, struct path *path);
139enum ovl_path_type ovl_path_real(struct dentry *dentry, struct path *path);
5ef88da5 140int ovl_path_next(int idx, struct dentry *dentry, struct path *path);
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MS		 141struct dentry *ovl_dentry_upper(struct dentry *dentry);
142struct dentry *ovl_dentry_lower(struct dentry *dentry);
143struct dentry *ovl_dentry_real(struct dentry *dentry);
144struct dentry *ovl_entry_real(struct ovl_entry *oe, bool *is_upper);
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MS		 145struct vfsmount *ovl_entry_mnt_real(struct ovl_entry *oe, struct inode *inode,
146 bool is_upper);
e9be9d5e 147struct ovl_dir_cache *ovl_dir_cache(struct dentry *dentry);
8d3095f4 148bool ovl_is_default_permissions(struct inode *inode);
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MS		 149void ovl_set_dir_cache(struct dentry *dentry, struct ovl_dir_cache *cache);
150struct dentry *ovl_workdir(struct dentry *dentry);
151int ovl_want_write(struct dentry *dentry);
152void ovl_drop_write(struct dentry *dentry);
153bool ovl_dentry_is_opaque(struct dentry *dentry);
154void ovl_dentry_set_opaque(struct dentry *dentry, bool opaque);
155bool ovl_is_whiteout(struct dentry *dentry);
156void ovl_dentry_update(struct dentry *dentry, struct dentry *upperdentry);
157struct dentry *ovl_lookup(struct inode *dir, struct dentry *dentry,
158 unsigned int flags);
159struct file *ovl_path_open(struct path *path, int flags);
160
161struct dentry *ovl_upper_create(struct dentry *upperdir, struct dentry *dentry,
162 struct kstat *stat, const char *link);
163
164/* readdir.c */
165extern const struct file_operations ovl_dir_operations;
166int ovl_check_empty_dir(struct dentry *dentry, struct list_head *list);
167void ovl_cleanup_whiteouts(struct dentry *upper, struct list_head *list);
168void ovl_cache_free(struct list_head *list);
45aebeaf 169int ovl_check_d_type_supported(struct path *realpath);
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MS		 170
171/* inode.c */
172int ovl_setattr(struct dentry *dentry, struct iattr *attr);
173int ovl_permission(struct inode *inode, int mask);
174int ovl_setxattr(struct dentry *dentry, const char *name,
175 const void *value, size_t size, int flags);
176ssize_t ovl_getxattr(struct dentry *dentry, const char *name,
177 void *value, size_t size);
178ssize_t ovl_listxattr(struct dentry *dentry, char *list, size_t size);
179int ovl_removexattr(struct dentry *dentry, const char *name);
4bacc9c9 180struct inode *ovl_d_select_inode(struct dentry *dentry, unsigned file_flags);
e9be9d5e
MS		 181
182struct inode *ovl_new_inode(struct super_block *sb, umode_t mode,
183 struct ovl_entry *oe);
184static inline void ovl_copyattr(struct inode *from, struct inode *to)
185{
186 to->i_uid = from->i_uid;
187 to->i_gid = from->i_gid;
188}
189
190/* dir.c */
191extern const struct inode_operations ovl_dir_inode_operations;
192struct dentry *ovl_lookup_temp(struct dentry *workdir, struct dentry *dentry);
193int ovl_create_real(struct inode *dir, struct dentry *newdentry,
194 struct kstat *stat, const char *link,
195 struct dentry *hardlink, bool debug);
196void ovl_cleanup(struct inode *dir, struct dentry *dentry);
197
198/* copy_up.c */
199int ovl_copy_up(struct dentry *dentry);
200int ovl_copy_up_one(struct dentry *parent, struct dentry *dentry,
0f7ff2da 201 struct path *lowerpath, struct kstat *stat);
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MS		 202int ovl_copy_xattr(struct dentry *old, struct dentry *new);
203int ovl_set_attr(struct dentry *upper, struct kstat *stat);
Linux kernel - Deliverables
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