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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 | ||
12 | struct ovl_entry; | |
13 | ||
14 | enum ovl_path_type { | |
15 | OVL_PATH_PURE_UPPER, | |
16 | OVL_PATH_UPPER, | |
17 | OVL_PATH_MERGE, | |
18 | OVL_PATH_LOWER, | |
19 | }; | |
20 | ||
21 | extern const char *ovl_opaque_xattr; | |
22 | ||
23 | static 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 | ||
30 | static 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 | ||
37 | static 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 | ||
48 | static 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 | ||
57 | static 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 | ||
66 | static 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 | ||
77 | static 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 | ||
86 | static 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 | ||
95 | static 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 | ||
102 | static 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 | ||
120 | static 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 | ||
127 | enum ovl_path_type ovl_path_type(struct dentry *dentry); | |
128 | u64 ovl_dentry_version_get(struct dentry *dentry); | |
129 | void ovl_dentry_version_inc(struct dentry *dentry); | |
130 | void ovl_path_upper(struct dentry *dentry, struct path *path); | |
131 | void ovl_path_lower(struct dentry *dentry, struct path *path); | |
132 | enum ovl_path_type ovl_path_real(struct dentry *dentry, struct path *path); | |
133 | struct dentry *ovl_dentry_upper(struct dentry *dentry); | |
134 | struct dentry *ovl_dentry_lower(struct dentry *dentry); | |
135 | struct dentry *ovl_dentry_real(struct dentry *dentry); | |
136 | struct dentry *ovl_entry_real(struct ovl_entry *oe, bool *is_upper); | |
137 | struct ovl_dir_cache *ovl_dir_cache(struct dentry *dentry); | |
138 | void ovl_set_dir_cache(struct dentry *dentry, struct ovl_dir_cache *cache); | |
139 | struct dentry *ovl_workdir(struct dentry *dentry); | |
140 | int ovl_want_write(struct dentry *dentry); | |
141 | void ovl_drop_write(struct dentry *dentry); | |
142 | bool ovl_dentry_is_opaque(struct dentry *dentry); | |
143 | void ovl_dentry_set_opaque(struct dentry *dentry, bool opaque); | |
144 | bool ovl_is_whiteout(struct dentry *dentry); | |
145 | void ovl_dentry_update(struct dentry *dentry, struct dentry *upperdentry); | |
146 | struct dentry *ovl_lookup(struct inode *dir, struct dentry *dentry, | |
147 | unsigned int flags); | |
148 | struct file *ovl_path_open(struct path *path, int flags); | |
149 | ||
150 | struct dentry *ovl_upper_create(struct dentry *upperdir, struct dentry *dentry, | |
151 | struct kstat *stat, const char *link); | |
152 | ||
153 | /* readdir.c */ | |
154 | extern const struct file_operations ovl_dir_operations; | |
155 | int ovl_check_empty_dir(struct dentry *dentry, struct list_head *list); | |
156 | void ovl_cleanup_whiteouts(struct dentry *upper, struct list_head *list); | |
157 | void ovl_cache_free(struct list_head *list); | |
158 | ||
159 | /* inode.c */ | |
160 | int ovl_setattr(struct dentry *dentry, struct iattr *attr); | |
161 | int ovl_permission(struct inode *inode, int mask); | |
162 | int ovl_setxattr(struct dentry *dentry, const char *name, | |
163 | const void *value, size_t size, int flags); | |
164 | ssize_t ovl_getxattr(struct dentry *dentry, const char *name, | |
165 | void *value, size_t size); | |
166 | ssize_t ovl_listxattr(struct dentry *dentry, char *list, size_t size); | |
167 | int ovl_removexattr(struct dentry *dentry, const char *name); | |
168 | ||
169 | struct inode *ovl_new_inode(struct super_block *sb, umode_t mode, | |
170 | struct ovl_entry *oe); | |
171 | static 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 */ | |
178 | extern const struct inode_operations ovl_dir_inode_operations; | |
179 | struct dentry *ovl_lookup_temp(struct dentry *workdir, struct dentry *dentry); | |
180 | int ovl_create_real(struct inode *dir, struct dentry *newdentry, | |
181 | struct kstat *stat, const char *link, | |
182 | struct dentry *hardlink, bool debug); | |
183 | void ovl_cleanup(struct inode *dir, struct dentry *dentry); | |
184 | ||
185 | /* copy_up.c */ | |
186 | int ovl_copy_up(struct dentry *dentry); | |
187 | int ovl_copy_up_one(struct dentry *parent, struct dentry *dentry, | |
188 | struct path *lowerpath, struct kstat *stat, | |
189 | struct iattr *attr); | |
190 | int ovl_copy_xattr(struct dentry *old, struct dentry *new); | |
191 | int ovl_set_attr(struct dentry *upper, struct kstat *stat); |