inotify: reimplement inotify using fsnotify
[deliverable/linux.git] / include / linux / fsnotify.h
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1#ifndef _LINUX_FS_NOTIFY_H
2#define _LINUX_FS_NOTIFY_H
3
4/*
5 * include/linux/fsnotify.h - generic hooks for filesystem notification, to
6 * reduce in-source duplication from both dnotify and inotify.
7 *
8 * We don't compile any of this away in some complicated menagerie of ifdefs.
9 * Instead, we rely on the code inside to optimize away as needed.
10 *
11 * (C) Copyright 2005 Robert Love
12 */
13
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14#include <linux/dnotify.h>
15#include <linux/inotify.h>
90586523 16#include <linux/fsnotify_backend.h>
73241ccc 17#include <linux/audit.h>
0eeca283 18
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19/*
20 * fsnotify_d_instantiate - instantiate a dentry for inode
21 * Called with dcache_lock held.
22 */
23static inline void fsnotify_d_instantiate(struct dentry *entry,
24 struct inode *inode)
25{
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26 __fsnotify_d_instantiate(entry, inode);
27
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28 inotify_d_instantiate(entry, inode);
29}
30
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31/* Notify this dentry's parent about a child's events. */
32static inline void fsnotify_parent(struct dentry *dentry, __u32 mask)
33{
34 __fsnotify_parent(dentry, mask);
35
36 inotify_dentry_parent_queue_event(dentry, mask, 0, dentry->d_name.name);
37}
38
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39/*
40 * fsnotify_d_move - entry has been moved
41 * Called with dcache_lock and entry->d_lock held.
42 */
43static inline void fsnotify_d_move(struct dentry *entry)
44{
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45 /*
46 * On move we need to update entry->d_flags to indicate if the new parent
47 * cares about events from this entry.
48 */
49 __fsnotify_update_dcache_flags(entry);
50
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51 inotify_d_move(entry);
52}
53
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54/*
55 * fsnotify_link_count - inode's link count changed
56 */
57static inline void fsnotify_link_count(struct inode *inode)
58{
59 inotify_inode_queue_event(inode, IN_ATTRIB, 0, NULL, NULL);
60
47882c6f 61 fsnotify(inode, FS_ATTRIB, inode, FSNOTIFY_EVENT_INODE, NULL, 0);
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62}
63
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64/*
65 * fsnotify_move - file old_name at old_dir was moved to new_name at new_dir
66 */
67static inline void fsnotify_move(struct inode *old_dir, struct inode *new_dir,
68 const char *old_name, const char *new_name,
5a190ae6 69 int isdir, struct inode *target, struct dentry *moved)
0eeca283 70{
5a190ae6 71 struct inode *source = moved->d_inode;
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72 u32 in_cookie = inotify_get_cookie();
73 u32 fs_cookie = fsnotify_get_cookie();
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74 __u32 old_dir_mask = 0;
75 __u32 new_dir_mask = 0;
0eeca283 76
90586523 77 if (old_dir == new_dir) {
90586523 78 old_dir_mask = FS_DN_RENAME;
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79 }
80
90586523 81 if (isdir) {
0eeca283 82 isdir = IN_ISDIR;
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83 old_dir_mask |= FS_IN_ISDIR;
84 new_dir_mask |= FS_IN_ISDIR;
85 }
86
87 old_dir_mask |= FS_MOVED_FROM;
88 new_dir_mask |= FS_MOVED_TO;
89
47882c6f 90 inotify_inode_queue_event(old_dir, IN_MOVED_FROM|isdir, in_cookie, old_name,
7c297722 91 source);
47882c6f 92 inotify_inode_queue_event(new_dir, IN_MOVED_TO|isdir, in_cookie, new_name,
7c297722 93 source);
75449536 94
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95 fsnotify(old_dir, old_dir_mask, old_dir, FSNOTIFY_EVENT_INODE, old_name, fs_cookie);
96 fsnotify(new_dir, new_dir_mask, new_dir, FSNOTIFY_EVENT_INODE, new_name, fs_cookie);
90586523 97
75449536 98 if (target) {
7c297722 99 inotify_inode_queue_event(target, IN_DELETE_SELF, 0, NULL, NULL);
75449536 100 inotify_inode_is_dead(target);
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101
102 /* this is really a link_count change not a removal */
103 fsnotify_link_count(target);
75449536 104 }
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105
106 if (source) {
7c297722 107 inotify_inode_queue_event(source, IN_MOVE_SELF, 0, NULL, NULL);
47882c6f 108 fsnotify(source, FS_MOVE_SELF, moved->d_inode, FSNOTIFY_EVENT_INODE, NULL, 0);
89204c40 109 }
5a190ae6 110 audit_inode_child(new_name, moved, new_dir);
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111}
112
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113/*
114 * fsnotify_inode_delete - and inode is being evicted from cache, clean up is needed
115 */
116static inline void fsnotify_inode_delete(struct inode *inode)
117{
118 __fsnotify_inode_delete(inode);
119}
120
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121/*
122 * fsnotify_nameremove - a filename was removed from a directory
123 */
124static inline void fsnotify_nameremove(struct dentry *dentry, int isdir)
125{
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126 __u32 mask = FS_DELETE;
127
7a91bf7f 128 if (isdir)
90586523 129 mask |= FS_IN_ISDIR;
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130
131 fsnotify_parent(dentry, mask);
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132}
133
134/*
135 * fsnotify_inoderemove - an inode is going away
136 */
137static inline void fsnotify_inoderemove(struct inode *inode)
138{
7c297722 139 inotify_inode_queue_event(inode, IN_DELETE_SELF, 0, NULL, NULL);
7a91bf7f 140 inotify_inode_is_dead(inode);
7a91bf7f 141
47882c6f 142 fsnotify(inode, FS_DELETE_SELF, inode, FSNOTIFY_EVENT_INODE, NULL, 0);
3be25f49 143 __fsnotify_inode_delete(inode);
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144}
145
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146/*
147 * fsnotify_create - 'name' was linked in
148 */
f38aa942 149static inline void fsnotify_create(struct inode *inode, struct dentry *dentry)
0eeca283 150{
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151 inotify_inode_queue_event(inode, IN_CREATE, 0, dentry->d_name.name,
152 dentry->d_inode);
5a190ae6 153 audit_inode_child(dentry->d_name.name, dentry, inode);
90586523 154
47882c6f 155 fsnotify(inode, FS_CREATE, dentry->d_inode, FSNOTIFY_EVENT_INODE, dentry->d_name.name, 0);
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156}
157
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158/*
159 * fsnotify_link - new hardlink in 'inode' directory
160 * Note: We have to pass also the linked inode ptr as some filesystems leave
161 * new_dentry->d_inode NULL and instantiate inode pointer later
162 */
163static inline void fsnotify_link(struct inode *dir, struct inode *inode, struct dentry *new_dentry)
164{
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165 inotify_inode_queue_event(dir, IN_CREATE, 0, new_dentry->d_name.name,
166 inode);
167 fsnotify_link_count(inode);
168 audit_inode_child(new_dentry->d_name.name, new_dentry, dir);
90586523 169
47882c6f 170 fsnotify(dir, FS_CREATE, inode, FSNOTIFY_EVENT_INODE, new_dentry->d_name.name, 0);
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171}
172
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173/*
174 * fsnotify_mkdir - directory 'name' was created
175 */
f38aa942 176static inline void fsnotify_mkdir(struct inode *inode, struct dentry *dentry)
0eeca283 177{
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178 __u32 mask = (FS_CREATE | FS_IN_ISDIR);
179 struct inode *d_inode = dentry->d_inode;
180
90586523 181 inotify_inode_queue_event(inode, mask, 0, dentry->d_name.name, d_inode);
5a190ae6 182 audit_inode_child(dentry->d_name.name, dentry, inode);
90586523 183
47882c6f 184 fsnotify(inode, mask, d_inode, FSNOTIFY_EVENT_INODE, dentry->d_name.name, 0);
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185}
186
187/*
188 * fsnotify_access - file was read
189 */
190static inline void fsnotify_access(struct dentry *dentry)
191{
192 struct inode *inode = dentry->d_inode;
90586523 193 __u32 mask = FS_ACCESS;
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194
195 if (S_ISDIR(inode->i_mode))
90586523 196 mask |= FS_IN_ISDIR;
0eeca283 197
7c297722 198 inotify_inode_queue_event(inode, mask, 0, NULL, NULL);
90586523 199
c28f7e56 200 fsnotify_parent(dentry, mask);
47882c6f 201 fsnotify(inode, mask, inode, FSNOTIFY_EVENT_INODE, NULL, 0);
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202}
203
204/*
205 * fsnotify_modify - file was modified
206 */
207static inline void fsnotify_modify(struct dentry *dentry)
208{
209 struct inode *inode = dentry->d_inode;
90586523 210 __u32 mask = FS_MODIFY;
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211
212 if (S_ISDIR(inode->i_mode))
90586523 213 mask |= FS_IN_ISDIR;
0eeca283 214
7c297722 215 inotify_inode_queue_event(inode, mask, 0, NULL, NULL);
90586523 216
c28f7e56 217 fsnotify_parent(dentry, mask);
47882c6f 218 fsnotify(inode, mask, inode, FSNOTIFY_EVENT_INODE, NULL, 0);
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219}
220
221/*
222 * fsnotify_open - file was opened
223 */
224static inline void fsnotify_open(struct dentry *dentry)
225{
226 struct inode *inode = dentry->d_inode;
90586523 227 __u32 mask = FS_OPEN;
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228
229 if (S_ISDIR(inode->i_mode))
90586523 230 mask |= FS_IN_ISDIR;
0eeca283 231
7c297722 232 inotify_inode_queue_event(inode, mask, 0, NULL, NULL);
90586523 233
c28f7e56 234 fsnotify_parent(dentry, mask);
47882c6f 235 fsnotify(inode, mask, inode, FSNOTIFY_EVENT_INODE, NULL, 0);
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236}
237
238/*
239 * fsnotify_close - file was closed
240 */
241static inline void fsnotify_close(struct file *file)
242{
0f7fc9e4 243 struct dentry *dentry = file->f_path.dentry;
0eeca283 244 struct inode *inode = dentry->d_inode;
aeb5d727 245 fmode_t mode = file->f_mode;
90586523 246 __u32 mask = (mode & FMODE_WRITE) ? FS_CLOSE_WRITE : FS_CLOSE_NOWRITE;
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247
248 if (S_ISDIR(inode->i_mode))
90586523 249 mask |= FS_IN_ISDIR;
0eeca283 250
7c297722 251 inotify_inode_queue_event(inode, mask, 0, NULL, NULL);
90586523 252
c28f7e56 253 fsnotify_parent(dentry, mask);
47882c6f 254 fsnotify(inode, mask, file, FSNOTIFY_EVENT_FILE, NULL, 0);
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255}
256
257/*
258 * fsnotify_xattr - extended attributes were changed
259 */
260static inline void fsnotify_xattr(struct dentry *dentry)
261{
262 struct inode *inode = dentry->d_inode;
90586523 263 __u32 mask = FS_ATTRIB;
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264
265 if (S_ISDIR(inode->i_mode))
90586523 266 mask |= FS_IN_ISDIR;
0eeca283 267
7c297722 268 inotify_inode_queue_event(inode, mask, 0, NULL, NULL);
90586523 269
c28f7e56 270 fsnotify_parent(dentry, mask);
47882c6f 271 fsnotify(inode, mask, inode, FSNOTIFY_EVENT_INODE, NULL, 0);
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272}
273
274/*
275 * fsnotify_change - notify_change event. file was modified and/or metadata
276 * was changed.
277 */
278static inline void fsnotify_change(struct dentry *dentry, unsigned int ia_valid)
279{
280 struct inode *inode = dentry->d_inode;
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281 __u32 mask = 0;
282
283 if (ia_valid & ATTR_UID)
284 mask |= FS_ATTRIB;
285 if (ia_valid & ATTR_GID)
286 mask |= FS_ATTRIB;
287 if (ia_valid & ATTR_SIZE)
288 mask |= FS_MODIFY;
0eeca283 289
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290 /* both times implies a utime(s) call */
291 if ((ia_valid & (ATTR_ATIME | ATTR_MTIME)) == (ATTR_ATIME | ATTR_MTIME))
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292 mask |= FS_ATTRIB;
293 else if (ia_valid & ATTR_ATIME)
294 mask |= FS_ACCESS;
295 else if (ia_valid & ATTR_MTIME)
296 mask |= FS_MODIFY;
297
298 if (ia_valid & ATTR_MODE)
299 mask |= FS_ATTRIB;
0eeca283 300
3c5119c0 301 if (mask) {
0eeca283 302 if (S_ISDIR(inode->i_mode))
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303 mask |= FS_IN_ISDIR;
304 inotify_inode_queue_event(inode, mask, 0, NULL, NULL);
c28f7e56 305
3c5119c0 306 fsnotify_parent(dentry, mask);
47882c6f 307 fsnotify(inode, mask, inode, FSNOTIFY_EVENT_INODE, NULL, 0);
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308 }
309}
310
90586523 311#if defined(CONFIG_INOTIFY) || defined(CONFIG_FSNOTIFY) /* notify helpers */
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312
313/*
314 * fsnotify_oldname_init - save off the old filename before we change it
315 */
316static inline const char *fsnotify_oldname_init(const char *name)
317{
318 return kstrdup(name, GFP_KERNEL);
319}
320
321/*
322 * fsnotify_oldname_free - free the name we got from fsnotify_oldname_init
323 */
324static inline void fsnotify_oldname_free(const char *old_name)
325{
326 kfree(old_name);
327}
328
90586523 329#else /* CONFIG_INOTIFY || CONFIG_FSNOTIFY */
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330
331static inline const char *fsnotify_oldname_init(const char *name)
332{
333 return NULL;
334}
335
336static inline void fsnotify_oldname_free(const char *old_name)
337{
338}
339
340#endif /* ! CONFIG_INOTIFY */
341
0eeca283 342#endif /* _LINUX_FS_NOTIFY_H */
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