|
Error trace
{
+__BLAST_initialize_/home/ldv/ldv-new/ldv-tools-inst/tmp/run/work/current--X--tests-model-32_1--test-doublelock.tar.bz2_26--X--defaultlinux-2.6.37--X--32_7/linux-2.6.37/csd_deg_dscv/2/dscv_tempdir/dscv/rcv/32_7/main-ldv_main0_sequence_infinite_withcheck_stateful/preprocess/1-cpp/drivers-tests-model-32_1-test-doublelock-doublelock.c.common.i();
{
11 -my_lock.count.counter = 1;
my_lock.wait_lock.__annonCompField18.rlock.raw_lock.slock = 0;
my_lock.wait_lock.__annonCompField18.rlock.magic = 3735899821;
my_lock.wait_lock.__annonCompField18.rlock.owner_cpu = 4294967295;
my_lock.wait_lock.__annonCompField18.rlock.owner = -1;
my_lock.wait_list.next = &(&(my_lock))->wait_list;
my_lock.wait_list.prev = &(&(my_lock))->wait_list;
my_lock.owner = 0;
my_lock.name = 0;
my_lock.magic = &(my_lock);
misc_fops.owner = &(__this_module);
misc_fops.llseek = 0;
misc_fops.read = 0;
misc_fops.write = 0;
misc_fops.aio_read = 0;
misc_fops.aio_write = 0;
misc_fops.readdir = 0;
misc_fops.poll = 0;
misc_fops.unlocked_ioctl = 0;
misc_fops.compat_ioctl = 0;
misc_fops.mmap = 0;
misc_fops.open = &(misc_open);
misc_fops.flush = 0;
misc_fops.release = 0;
misc_fops.fsync = 0;
misc_fops.aio_fsync = 0;
misc_fops.fasync = 0;
misc_fops.lock = 0;
misc_fops.sendpage = 0;
misc_fops.get_unmapped_area = 0;
misc_fops.check_flags = 0;
misc_fops.flock = 0;
misc_fops.splice_write = 0;
misc_fops.splice_read = 0;
misc_fops.setlease = 0;
__mod_license50[ 0 ] = 108;
__mod_license50[ 1 ] = 105;
__mod_license50[ 2 ] = 99;
__mod_license50[ 3 ] = 101;
__mod_license50[ 4 ] = 110;
__mod_license50[ 5 ] = 115;
__mod_license50[ 6 ] = 101;
__mod_license50[ 7 ] = 61;
__mod_license50[ 8 ] = 65;
__mod_license50[ 9 ] = 112;
__mod_license50[ 10 ] = 97;
__mod_license50[ 11 ] = 99;
__mod_license50[ 12 ] = 104;
__mod_license50[ 13 ] = 101;
__mod_license50[ 14 ] = 32;
__mod_license50[ 15 ] = 50;
__mod_license50[ 16 ] = 46;
__mod_license50[ 17 ] = 48;
__mod_license50[ 18 ] = 0;
__mod_author51[ 0 ] = 97;
__mod_author51[ 1 ] = 117;
__mod_author51[ 2 ] = 116;
__mod_author51[ 3 ] = 104;
__mod_author51[ 4 ] = 111;
__mod_author51[ 5 ] = 114;
__mod_author51[ 6 ] = 61;
__mod_author51[ 7 ] = 76;
__mod_author51[ 8 ] = 68;
__mod_author51[ 9 ] = 86;
__mod_author51[ 10 ] = 32;
__mod_author51[ 11 ] = 80;
__mod_author51[ 12 ] = 114;
__mod_author51[ 13 ] = 111;
__mod_author51[ 14 ] = 106;
__mod_author51[ 15 ] = 101;
__mod_author51[ 16 ] = 99;
__mod_author51[ 17 ] = 116;
__mod_author51[ 18 ] = 44;
__mod_author51[ 19 ] = 32;
__mod_author51[ 20 ] = 86;
__mod_author51[ 21 ] = 97;
__mod_author51[ 22 ] = 100;
__mod_author51[ 23 ] = 105;
__mod_author51[ 24 ] = 109;
__mod_author51[ 25 ] = 32;
__mod_author51[ 26 ] = 77;
__mod_author51[ 27 ] = 117;
__mod_author51[ 28 ] = 116;
__mod_author51[ 29 ] = 105;
__mod_author51[ 30 ] = 108;
__mod_author51[ 31 ] = 105;
__mod_author51[ 32 ] = 110;
__mod_author51[ 33 ] = 32;
__mod_author51[ 34 ] = 60;
__mod_author51[ 35 ] = 109;
__mod_author51[ 36 ] = 117;
__mod_author51[ 37 ] = 116;
__mod_author51[ 38 ] = 105;
__mod_author51[ 39 ] = 108;
__mod_author51[ 40 ] = 105;
__mod_author51[ 41 ] = 110;
__mod_author51[ 42 ] = 64;
__mod_author51[ 43 ] = 105;
__mod_author51[ 44 ] = 115;
__mod_author51[ 45 ] = 112;
__mod_author51[ 46 ] = 114;
__mod_author51[ 47 ] = 97;
__mod_author51[ 48 ] = 115;
__mod_author51[ 49 ] = 46;
__mod_author51[ 50 ] = 114;
__mod_author51[ 51 ] = 117;
__mod_author51[ 52 ] = 62;
__mod_author51[ 53 ] = 0;
ldv_mutex_TEMPLATE = 1;
return 0; }
107 LDV_IN_INTERRUPT = 1;
116 +ldv_initialize_FOREACH();
{
+ldv_initialize_my_lock();
{
351 ldv_mutex_my_lock = 1;
return 0; }
return 0; }
{
35 +tmp = register_chrdev(10 /* major */, "misc" /* name */, &(misc_fops) /* fops */);
{
2068 tmp = __register_chrdev(major, 0, 256, name, fops) { /* The function body is undefined. */ };
}
}
124 ldv_s_misc_fops_file_operations = 0;
127 tmp___1 = nondet_int() { /* The function body is undefined. */ };
127 assert( tmp___1 != 0);
131 tmp___0 = nondet_int() { /* The function body is undefined. */ };
133 assert( tmp___0 == 0);
136 assert( ldv_s_misc_fops_file_operations == 0);
141 -res_misc_open_1 = misc_open(var_group1 /* inode */, var_group2 /* file */);
{
27 +mutex_lock_my_lock(&(my_lock) /* lock */);
{
300 assert( ldv_mutex_my_lock == 1);
302 ldv_mutex_my_lock = 2;
return 0; }
{
21 +mutex_lock_my_lock(&(my_lock) /* lock */);
{
300 assert( ldv_mutex_my_lock != 1);
{
} } } } }
|
Source code
1
2 /**
3 * The test checks that double mutex lock is detected on the models 32_1,32_2
4 */
5 #include <linux/kernel.h>
6 #include <linux/module.h>
7 #include <linux/mutex.h>
8 #include <linux/major.h>
9 #include <linux/fs.h>
10
11 static DEFINE_MUTEX(my_lock);
12
13 static int misc_open( struct inode * inode, struct file * file);
14
15 static const struct file_operations misc_fops = {
16 .owner = THIS_MODULE,
17 .open = misc_open,
18 };
19
20 static void alock( void) {
21 mutex_lock(&my_lock);
22 mutex_unlock(&my_lock);
23 }
24
25 static int misc_open( struct inode * inode, struct file * file)
26 {
27 mutex_lock(&my_lock);
28 alock();
29 mutex_unlock(&my_lock);
30 return 0;
31 }
32
33 static int __init my_init( void)
34 {
35 if (register_chrdev(MISC_MAJOR, "misc",&misc_fops))
36 goto fail_register;
37 return 0;
38
39 fail_register:
40 return - 1;
41 }
42
43 static void __exit my_exit( void)
44 {
45 }
46
47 module_init(my_init);
48 module_exit(my_exit);
49
50 MODULE_LICENSE( "Apache 2.0");
51 MODULE_AUTHOR( "LDV Project, Vadim Mutilin <mutilin@ispras.ru>");
52
53
54
55
56
57
58 /* LDV_COMMENT_BEGIN_MAIN */
59 #ifdef LDV_MAIN0_sequence_infinite_withcheck_stateful
60
61 /*###########################################################################*/
62
63 /*############## Driver Environment Generator 0.2 output ####################*/
64
65 /*###########################################################################*/
66
67
68
69 /* LDV_COMMENT_FUNCTION_DECLARE_LDV Special function for LDV verifier. Test if all kernel resources are correctly released by driver before driver will be unloaded. */
70 void ldv_check_final_state( void);
71
72 /* LDV_COMMENT_FUNCTION_DECLARE_LDV Special function for LDV verifier. Test correct return result. */
73 void ldv_check_return_value( int res);
74
75 /* LDV_COMMENT_FUNCTION_DECLARE_LDV Special function for LDV verifier. Initializes the model. */
76 void ldv_initialize( void);
77
78 /* LDV_COMMENT_FUNCTION_DECLARE_LDV Special function for LDV verifier. Returns arbitrary interger value. */
79 int nondet_int( void);
80
81 /* LDV_COMMENT_VAR_DECLARE_LDV Special variable for LDV verifier. */
82 int LDV_IN_INTERRUPT;
83
84 /* LDV_COMMENT_FUNCTION_MAIN Main function for LDV verifier. */
85 void ldv_main0_sequence_infinite_withcheck_stateful( void) {
86
87
88
89 /* LDV_COMMENT_BEGIN_VARIABLE_DECLARATION_PART */
90 /*============================= VARIABLE DECLARATION PART =============================*/
91 /** STRUCT: struct type: file_operations, struct name: misc_fops **/
92 /* content: static int misc_open(struct inode * inode, struct file * file)*/
93 /* LDV_COMMENT_END_PREP */
94 /* LDV_COMMENT_VAR_DECLARE Variable declaration for function "misc_open" */
95 struct inode * var_group1;
96 /* LDV_COMMENT_VAR_DECLARE Variable declaration for function "misc_open" */
97 struct file * var_group2;
98 /* LDV_COMMENT_VAR_DECLARE Variable declaration for test return result from function call "misc_open" */
99 static int res_misc_open_1;
100
101
102
103
104 /* LDV_COMMENT_END_VARIABLE_DECLARATION_PART */
105 /* LDV_COMMENT_BEGIN_VARIABLE_INITIALIZING_PART */
106 /*============================= VARIABLE INITIALIZING PART =============================*/
107 LDV_IN_INTERRUPT= 1;
108
109
110
111
112 /* LDV_COMMENT_END_VARIABLE_INITIALIZING_PART */
113 /* LDV_COMMENT_BEGIN_FUNCTION_CALL_SECTION */
114 /*============================= FUNCTION CALL SECTION =============================*/
115 /* LDV_COMMENT_FUNCTION_CALL Initialize LDV model. */
116 ldv_initialize();
117
118 /** INIT: init_type: ST_MODULE_INIT **/
119 /* content: static int __init my_init(void)*/
120 /* LDV_COMMENT_END_PREP */
121 /* LDV_COMMENT_FUNCTION_CALL Kernel calls driver init function after driver loading to kernel. This function declared as "MODULE_INIT(function name)". */
122 if(my_init())
123 goto ldv_final;
124 int ldv_s_misc_fops_file_operations = 0;
125
126
127 while( nondet_int()
128 || !(ldv_s_misc_fops_file_operations == 0)
129 ) {
130
131 switch(nondet_int()) {
132
133 case 0: {
134
135 /** STRUCT: struct type: file_operations, struct name: misc_fops **/
136 if(ldv_s_misc_fops_file_operations== 0) {
137
138 /* content: static int misc_open(struct inode * inode, struct file * file)*/
139 /* LDV_COMMENT_END_PREP */
140 /* LDV_COMMENT_FUNCTION_CALL Function from field "open" from driver structure with callbacks "misc_fops". Standart function test for correct return result. */
141 res_misc_open_1 = misc_open( var_group1, var_group2);
142 ldv_check_return_value(res_misc_open_1);
143 if(res_misc_open_1)
144 goto ldv_module_exit;
145 ldv_s_misc_fops_file_operations= 0;
146
147 }
148
149 }
150
151 break;
152 default: break;
153
154 }
155
156 }
157
158 ldv_module_exit:
159
160 /** INIT: init_type: ST_MODULE_EXIT **/
161 /* content: static void __exit my_exit(void)*/
162 /* LDV_COMMENT_END_PREP */
163 /* LDV_COMMENT_FUNCTION_CALL Kernel calls driver release function before driver will be uploaded from kernel. This function declared as "MODULE_EXIT(function name)". */
164 my_exit();
165
166 /* LDV_COMMENT_FUNCTION_CALL Checks that all resources and locks are correctly released before the driver will be unloaded. */
167 ldv_final: ldv_check_final_state();
168
169 /* LDV_COMMENT_END_FUNCTION_CALL_SECTION */
170 return;
171
172 }
173 #endif
174
175 /* LDV_COMMENT_END_MAIN */
176 /* LDV_COMMENT_BEGIN_MODEL */
177
178 /*
179 * CONFIG_DEBUG_LOCK_ALLOC must be turned off to apply the given model.
180 * To be independ on the value of this flag there is the corresponding
181 * aspect model.
182 */
183
184 /* the function works only without aspectator */
185 long __builtin_expect( long val, long res) {
186 return val;
187 }
188
189 #include "engine-blast.h"
190
191 #include <linux/kernel.h>
192 #include <linux/mutex.h>
193
194 /* Need this because rerouter is buggy!.. */
195 extern int ldv_mutex_TEMPLATE;
196 /* Now the actual variable goes... */
197 int ldv_mutex_TEMPLATE = 1;
198
199 /* LDV_COMMENT_MODEL_FUNCTION_DEFINITION(name='mutex_lock_interruptible') Check that the mutex was unlocked and nondeterministically lock it. Return the corresponding error code on fails*/
200 int mutex_lock_interruptible_TEMPLATE( struct mutex *lock)
201 {
202 int nondetermined;
203
204 /* LDV_COMMENT_ASSERT Mutex must be unlocked*/
205 ldv_assert(ldv_mutex_TEMPLATE == 1);
206
207 /* LDV_COMMENT_OTHER Construct the nondetermined result*/
208 nondetermined = ldv_undef_int();
209
210 /* LDV_COMMENT_ASSERT Nondeterministically lock the mutex*/
211 if (nondetermined)
212 {
213 /* LDV_COMMENT_CHANGE_STATE Lock the mutex*/
214 ldv_mutex_TEMPLATE = 2;
215 /* LDV_COMMENT_RETURN Finish with success*/
216 return 0;
217 }
218 else
219 {
220 /* LDV_COMMENT_RETURN Finish with the fail. The mutex is keeped unlocked*/
221 return -EINTR;
222 }
223 }
224
225 /* LDV_COMMENT_MODEL_FUNCTION_DEFINITION(name='atomic_dec_and_mutex_lock') Lock if atomic decrement result is zero */
226 int atomic_dec_and_mutex_lock_TEMPLATE(atomic_t *cnt, struct mutex *lock)
227 {
228 int atomic_value_after_dec;
229
230 /* LDV_COMMENT_ASSERT Mutex must be unlocked (since we may lock it in this function) */
231 ldv_assert(ldv_mutex_TEMPLATE == 1);
232
233 /* LDV_COMMENT_OTHER Assign the result of atomic decrement */
234 atomic_value_after_dec = ldv_undef_int();
235
236 /* LDV_COMMENT_ASSERT Check if atomic decrement returns zero */
237 if (atomic_value_after_dec == 0)
238 {
239 /* LDV_COMMENT_CHANGE_STATE Lock the mutex, as atomic has decremented to zero*/
240 ldv_mutex_TEMPLATE = 2;
241 /* LDV_COMMENT_RETURN Return 1 with a locked mutex */
242 return 1;
243 }
244
245 /* LDV_COMMENT_RETURN Atomic decrement is still not zero, return 0 without locking the mutex */
246 return 0;
247 }
248
249 /* LDV_COMMENT_MODEL_FUNCTION_DEFINITION(name='mutex_lock_killable') Check that the mutex wasn unlocked and nondeterministically lock it. Return the corresponding error code on fails*/
250 int __must_check mutex_lock_killable_TEMPLATE( struct mutex *lock)
251 {
252 int nondetermined;
253
254 /* LDV_COMMENT_ASSERT Mutex must be unlocked*/
255 ldv_assert(ldv_mutex_TEMPLATE == 1);
256
257 /* LDV_COMMENT_OTHER Construct the nondetermined result*/
258 nondetermined = ldv_undef_int();
259
260 /* LDV_COMMENT_ASSERT Nondeterministically lock the mutex*/
261 if (nondetermined)
262 {
263 /* LDV_COMMENT_CHANGE_STATE Lock the mutex*/
264 ldv_mutex_TEMPLATE = 2;
265 /* LDV_COMMENT_RETURN Finish with success*/
266 return 0;
267 }
268 else
269 {
270 /* LDV_COMMENT_RETURN Finish with the fail. The mutex is keeped unlocked*/
271 return -EINTR;
272 }
273 }
274
275 /* LDV_COMMENT_MODEL_FUNCTION_DEFINITION(name='mutex_is_locked') Checks whether the mutex is locked*/
276 int mutex_is_locked_TEMPLATE( struct mutex *lock)
277 {
278 int nondetermined;
279
280 if(ldv_mutex_TEMPLATE == 1) {
281 /* LDV_COMMENT_OTHER Construct the nondetermined result*/
282 nondetermined = ldv_undef_int();
283 if(nondetermined) {
284 /* LDV_COMMENT_RETURN the mutex is unlocked*/
285 return 0;
286 } else {
287 /* LDV_COMMENT_RETURN the mutex is locked*/
288 return 1;
289 }
290 } else {
291 /* LDV_COMMENT_RETURN the mutex is locked*/
292 return 1;
293 }
294 }
295
296 /* LDV_COMMENT_MODEL_FUNCTION_DEFINITION(name='mutex_lock(?!_interruptible|_killable)') Check that the mutex was not locked and lock it*/
297 void mutex_lock_TEMPLATE( struct mutex *lock)
298 {
299 /* LDV_COMMENT_ASSERT Mutex must be unlocked*/
300 ldv_assert(ldv_mutex_TEMPLATE == 1);
301 /* LDV_COMMENT_CHANGE_STATE Lock the mutex*/
302 ldv_mutex_TEMPLATE = 2;
303 }
304
305 /* LDV_COMMENT_MODEL_FUNCTION_DEFINITION(name='mutex_trylock') Check that the mutex was not locked and nondeterministically lock it. Return 0 on fails*/
306 int mutex_trylock_TEMPLATE( struct mutex *lock)
307 {
308 int is_mutex_held_by_another_thread;
309
310 /* LDV_COMMENT_ASSERT Mutex must be unlocked*/
311 ldv_assert(ldv_mutex_TEMPLATE == 1);
312
313 /* LDV_COMMENT_OTHER Construct the nondetermined result*/
314 is_mutex_held_by_another_thread = ldv_undef_int();
315
316 /* LDV_COMMENT_ASSERT Nondeterministically lock the mutex*/
317 if (is_mutex_held_by_another_thread)
318 {
319 /* LDV_COMMENT_RETURN Finish with fail*/
320 return 0;
321 }
322 else
323 {
324 /* LDV_COMMENT_CHANGE_STATE Lock the mutex*/
325 ldv_mutex_TEMPLATE = 2;
326 /* LDV_COMMENT_RETURN Finish with success*/
327 return 1;
328 }
329 }
330
331 /* LDV_COMMENT_MODEL_FUNCTION_DEFINITION(name='mutex_unlock') Check that the mutex was locked and unlock it*/
332 void mutex_unlock_TEMPLATE( struct mutex *lock)
333 {
334 /* LDV_COMMENT_ASSERT Mutex must be locked*/
335 ldv_assert(ldv_mutex_TEMPLATE == 2);
336 /* LDV_COMMENT_CHANGE_STATE Unlock the mutex*/
337 ldv_mutex_TEMPLATE = 1;
338 }
339
340 /* LDV_COMMENT_MODEL_FUNCTION_DEFINITION(name='check_final_state') Check that the mutex is unlocked at the end*/
341 void ldv_check_final_state_TEMPLATE( void)
342 {
343 /* LDV_COMMENT_ASSERT The mutex must be unlocked at the end*/
344 ldv_assert(ldv_mutex_TEMPLATE == 1);
345 }
346
347 /* LDV_COMMENT_MODEL_FUNCTION_DEFINITION(name='ldv_initialize') Initialize mutex variables*/
348 void ldv_initialize_TEMPLATE( void)
349 {
350 /* LDV_COMMENT_ASSERT Initialize mutex with initial model value*/
351 ldv_mutex_TEMPLATE = 1;
352 }
353
354 /* LDV_COMMENT_END_MODEL */
1 #ifndef _LINUX_FS_H
2 #define _LINUX_FS_H
3
4 /*
5 * This file has definitions for some important file table
6 * structures etc.
7 */
8
9 #include <linux/limits.h>
10 #include <linux/ioctl.h>
11 #include <linux/blk_types.h>
12 #include <linux/types.h>
13
14 /*
15 * It's silly to have NR_OPEN bigger than NR_FILE, but you can change
16 * the file limit at runtime and only root can increase the per-process
17 * nr_file rlimit, so it's safe to set up a ridiculously high absolute
18 * upper limit on files-per-process.
19 *
20 * Some programs (notably those using select()) may have to be
21 * recompiled to take full advantage of the new limits..
22 */
23
24 /* Fixed constants first: */
25 #undef NR_OPEN
26 #define INR_OPEN 1024 /* Initial setting for nfile rlimits */
27
28 #define BLOCK_SIZE_BITS 10
29 #define BLOCK_SIZE ( 1<<BLOCK_SIZE_BITS)
30
31 #define SEEK_SET 0 /* seek relative to beginning of file */
32 #define SEEK_CUR 1 /* seek relative to current file position */
33 #define SEEK_END 2 /* seek relative to end of file */
34 #define SEEK_MAX SEEK_END
35
36 struct fstrim_range {
37 __u64 start;
38 __u64 len;
39 __u64 minlen;
40 };
41
42 /* And dynamically-tunable limits and defaults: */
43 struct files_stat_struct {
44 unsigned long nr_files; /* read only */
45 unsigned long nr_free_files; /* read only */
46 unsigned long max_files; /* tunable */
47 };
48
49 struct inodes_stat_t {
50 int nr_inodes;
51 int nr_unused;
52 int dummy[ 5]; /* padding for sysctl ABI compatibility */
53 };
54
55
56 #define NR_FILE 8192 /* this can well be larger on a larger system */
57
58 #define MAY_EXEC 1
59 #define MAY_WRITE 2
60 #define MAY_READ 4
61 #define MAY_APPEND 8
62 #define MAY_ACCESS 16
63 #define MAY_OPEN 32
64 #define MAY_CHDIR 64
65
66 /*
67 * flags in file.f_mode. Note that FMODE_READ and FMODE_WRITE must correspond
68 * to O_WRONLY and O_RDWR via the strange trick in __dentry_open()
69 */
70
71 /* file is open for reading */
72 #define FMODE_READ ((__force fmode_t)0x1)
73 /* file is open for writing */
74 #define FMODE_WRITE ((__force fmode_t)0x2)
75 /* file is seekable */
76 #define FMODE_LSEEK ((__force fmode_t)0x4)
77 /* file can be accessed using pread */
78 #define FMODE_PREAD ((__force fmode_t)0x8)
79 /* file can be accessed using pwrite */
80 #define FMODE_PWRITE ((__force fmode_t)0x10)
81 /* File is opened for execution with sys_execve / sys_uselib */
82 #define FMODE_EXEC ((__force fmode_t)0x20)
83 /* File is opened with O_NDELAY (only set for block devices) */
84 #define FMODE_NDELAY ((__force fmode_t)0x40)
85 /* File is opened with O_EXCL (only set for block devices) */
86 #define FMODE_EXCL ((__force fmode_t)0x80)
87 /* File is opened using open(.., 3, ..) and is writeable only for ioctls
88 (specialy hack for floppy.c) */
89 #define FMODE_WRITE_IOCTL ((__force fmode_t)0x100)
90
91 /*
92 * Don't update ctime and mtime.
93 *
94 * Currently a special hack for the XFS open_by_handle ioctl, but we'll
95 * hopefully graduate it to a proper O_CMTIME flag supported by open(2) soon.
96 */
97 #define FMODE_NOCMTIME ((__force fmode_t)0x800)
98
99 /* Expect random access pattern */
100 #define FMODE_RANDOM ((__force fmode_t)0x1000)
101
102 /* File is huge (eg. /dev/kmem): treat loff_t as unsigned */
103 #define FMODE_UNSIGNED_OFFSET ((__force fmode_t)0x2000)
104
105 /* File was opened by fanotify and shouldn't generate fanotify events */
106 #define FMODE_NONOTIFY ((__force fmode_t)0x1000000)
107
108 /*
109 * The below are the various read and write types that we support. Some of
110 * them include behavioral modifiers that send information down to the
111 * block layer and IO scheduler. Terminology:
112 *
113 * The block layer uses device plugging to defer IO a little bit, in
114 * the hope that we will see more IO very shortly. This increases
115 * coalescing of adjacent IO and thus reduces the number of IOs we
116 * have to send to the device. It also allows for better queuing,
117 * if the IO isn't mergeable. If the caller is going to be waiting
118 * for the IO, then he must ensure that the device is unplugged so
119 * that the IO is dispatched to the driver.
120 *
121 * All IO is handled async in Linux. This is fine for background
122 * writes, but for reads or writes that someone waits for completion
123 * on, we want to notify the block layer and IO scheduler so that they
124 * know about it. That allows them to make better scheduling
125 * decisions. So when the below references 'sync' and 'async', it
126 * is referencing this priority hint.
127 *
128 * With that in mind, the available types are:
129 *
130 * READ A normal read operation. Device will be plugged.
131 * READ_SYNC A synchronous read. Device is not plugged, caller can
132 * immediately wait on this read without caring about
133 * unplugging.
134 * READA Used for read-ahead operations. Lower priority, and the
135 * block layer could (in theory) choose to ignore this
136 * request if it runs into resource problems.
137 * WRITE A normal async write. Device will be plugged.
138 * WRITE_SYNC_PLUG Synchronous write. Identical to WRITE, but passes down
139 * the hint that someone will be waiting on this IO
140 * shortly. The device must still be unplugged explicitly,
141 * WRITE_SYNC_PLUG does not do this as we could be
142 * submitting more writes before we actually wait on any
143 * of them.
144 * WRITE_SYNC Like WRITE_SYNC_PLUG, but also unplugs the device
145 * immediately after submission. The write equivalent
146 * of READ_SYNC.
147 * WRITE_ODIRECT_PLUG Special case write for O_DIRECT only.
148 * WRITE_FLUSH Like WRITE_SYNC but with preceding cache flush.
149 * WRITE_FUA Like WRITE_SYNC but data is guaranteed to be on
150 * non-volatile media on completion.
151 * WRITE_FLUSH_FUA Combination of WRITE_FLUSH and FUA. The IO is preceded
152 * by a cache flush and data is guaranteed to be on
153 * non-volatile media on completion.
154 *
155 */
156 #define RW_MASK REQ_WRITE
157 #define RWA_MASK REQ_RAHEAD
158
159 #define READ 0
160 #define WRITE RW_MASK
161 #define READA RWA_MASK
162
163 #define READ_SYNC (READ | REQ_SYNC | REQ_UNPLUG)
164 #define READ_META (READ | REQ_META)
165 #define WRITE_SYNC_PLUG (WRITE | REQ_SYNC | REQ_NOIDLE)
166 #define WRITE_SYNC (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_UNPLUG)
167 #define WRITE_ODIRECT_PLUG (WRITE | REQ_SYNC)
168 #define WRITE_META (WRITE | REQ_META)
169 #define WRITE_FLUSH (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_UNPLUG | \
170 REQ_FLUSH)
171 #define WRITE_FUA (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_UNPLUG | \
172 REQ_FUA)
173 #define WRITE_FLUSH_FUA (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_UNPLUG | \
174 REQ_FLUSH | REQ_FUA)
175
176 #define SEL_IN 1
177 #define SEL_OUT 2
178 #define SEL_EX 4
179
180 /* public flags for file_system_type */
181 #define FS_REQUIRES_DEV 1
182 #define FS_BINARY_MOUNTDATA 2
183 #define FS_HAS_SUBTYPE 4
184 #define FS_REVAL_DOT 16384 /* Check the paths ".", ".." for staleness */
185 #define FS_RENAME_DOES_D_MOVE 32768 /* FS will handle d_move()
186 * during rename() internally.
187 */
188
189 /*
190 * These are the fs-independent mount-flags: up to 32 flags are supported
191 */
192 #define MS_RDONLY 1 /* Mount read-only */
193 #define MS_NOSUID 2 /* Ignore suid and sgid bits */
194 #define MS_NODEV 4 /* Disallow access to device special files */
195 #define MS_NOEXEC 8 /* Disallow program execution */
196 #define MS_SYNCHRONOUS 16 /* Writes are synced at once */
197 #define MS_REMOUNT 32 /* Alter flags of a mounted FS */
198 #define MS_MANDLOCK 64 /* Allow mandatory locks on an FS */
199 #define MS_DIRSYNC 128 /* Directory modifications are synchronous */
200 #define MS_NOATIME 1024 /* Do not update access times. */
201 #define MS_NODIRATIME 2048 /* Do not update directory access times */
202 #define MS_BIND 4096
203 #define MS_MOVE 8192
204 #define MS_REC 16384
205 #define MS_VERBOSE 32768 /* War is peace. Verbosity is silence.
206 MS_VERBOSE is deprecated. */
207 #define MS_SILENT 32768
208 #define MS_POSIXACL ( 1<< 16) /* VFS does not apply the umask */
209 #define MS_UNBINDABLE ( 1<< 17) /* change to unbindable */
210 #define MS_PRIVATE ( 1<< 18) /* change to private */
211 #define MS_SLAVE ( 1<< 19) /* change to slave */
212 #define MS_SHARED ( 1<< 20) /* change to shared */
213 #define MS_RELATIME ( 1<< 21) /* Update atime relative to mtime/ctime. */
214 #define MS_KERNMOUNT ( 1<< 22) /* this is a kern_mount call */
215 #define MS_I_VERSION ( 1<< 23) /* Update inode I_version field */
216 #define MS_STRICTATIME ( 1<< 24) /* Always perform atime updates */
217 #define MS_BORN ( 1<< 29)
218 #define MS_ACTIVE ( 1<< 30)
219 #define MS_NOUSER ( 1<< 31)
220
221 /*
222 * Superblock flags that can be altered by MS_REMOUNT
223 */
224 #define MS_RMT_MASK (MS_RDONLY|MS_SYNCHRONOUS|MS_MANDLOCK|MS_I_VERSION)
225
226 /*
227 * Old magic mount flag and mask
228 */
229 #define MS_MGC_VAL 0xC0ED0000
230 #define MS_MGC_MSK 0xffff0000
231
232 /* Inode flags - they have nothing to superblock flags now */
233
234 #define S_SYNC 1 /* Writes are synced at once */
235 #define S_NOATIME 2 /* Do not update access times */
236 #define S_APPEND 4 /* Append-only file */
237 #define S_IMMUTABLE 8 /* Immutable file */
238 #define S_DEAD 16 /* removed, but still open directory */
239 #define S_NOQUOTA 32 /* Inode is not counted to quota */
240 #define S_DIRSYNC 64 /* Directory modifications are synchronous */
241 #define S_NOCMTIME 128 /* Do not update file c/mtime */
242 #define S_SWAPFILE 256 /* Do not truncate: swapon got its bmaps */
243 #define S_PRIVATE 512 /* Inode is fs-internal */
244 #define S_IMA 1024 /* Inode has an associated IMA struct */
245
246 /*
247 * Note that nosuid etc flags are inode-specific: setting some file-system
248 * flags just means all the inodes inherit those flags by default. It might be
249 * possible to override it selectively if you really wanted to with some
250 * ioctl() that is not currently implemented.
251 *
252 * Exception: MS_RDONLY is always applied to the entire file system.
253 *
254 * Unfortunately, it is possible to change a filesystems flags with it mounted
255 * with files in use. This means that all of the inodes will not have their
256 * i_flags updated. Hence, i_flags no longer inherit the superblock mount
257 * flags, so these have to be checked separately. -- rmk@arm.uk.linux.org
258 */
259 #define __IS_FLG(inode,flg) ((inode)->i_sb->s_flags & (flg))
260
261 #define IS_RDONLY(inode) ((inode)->i_sb->s_flags & MS_RDONLY)
262 #define IS_SYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS) || \
263 ((inode)->i_flags & S_SYNC))
264 #define IS_DIRSYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS|MS_DIRSYNC) || \
265 ((inode)->i_flags & (S_SYNC|S_DIRSYNC)))
266 #define IS_MANDLOCK(inode) __IS_FLG(inode, MS_MANDLOCK)
267 #define IS_NOATIME(inode) __IS_FLG(inode, MS_RDONLY|MS_NOATIME)
268 #define IS_I_VERSION(inode) __IS_FLG(inode, MS_I_VERSION)
269
270 #define IS_NOQUOTA(inode) ((inode)->i_flags & S_NOQUOTA)
271 #define IS_APPEND(inode) ((inode)->i_flags & S_APPEND)
272 #define IS_IMMUTABLE(inode) ((inode)->i_flags & S_IMMUTABLE)
273 #define IS_POSIXACL(inode) __IS_FLG(inode, MS_POSIXACL)
274
275 #define IS_DEADDIR(inode) ((inode)->i_flags & S_DEAD)
276 #define IS_NOCMTIME(inode) ((inode)->i_flags & S_NOCMTIME)
277 #define IS_SWAPFILE(inode) ((inode)->i_flags & S_SWAPFILE)
278 #define IS_PRIVATE(inode) ((inode)->i_flags & S_PRIVATE)
279 #define IS_IMA(inode) ((inode)->i_flags & S_IMA)
280
281 /* the read-only stuff doesn't really belong here, but any other place is
282 probably as bad and I don't want to create yet another include file. */
283
284 #define BLKROSET _IO(0x12, 93) /* set device read-only (0 = read-write) */
285 #define BLKROGET _IO(0x12, 94) /* get read-only status (0 = read_write) */
286 #define BLKRRPART _IO(0x12, 95) /* re-read partition table */
287 #define BLKGETSIZE _IO(0x12, 96) /* return device size /512 (long *arg) */
288 #define BLKFLSBUF _IO(0x12, 97) /* flush buffer cache */
289 #define BLKRASET _IO(0x12, 98) /* set read ahead for block device */
290 #define BLKRAGET _IO(0x12, 99) /* get current read ahead setting */
291 #define BLKFRASET _IO(0x12, 100) /* set filesystem (mm/filemap.c) read-ahead */
292 #define BLKFRAGET _IO(0x12, 101) /* get filesystem (mm/filemap.c) read-ahead */
293 #define BLKSECTSET _IO(0x12, 102) /* set max sectors per request (ll_rw_blk.c) */
294 #define BLKSECTGET _IO(0x12, 103) /* get max sectors per request (ll_rw_blk.c) */
295 #define BLKSSZGET _IO(0x12, 104) /* get block device sector size */
296 #if 0
297 #define BLKPG _IO(0x12, 105) /* See blkpg.h */
298
299 /* Some people are morons. Do not use sizeof! */
300
301 #define BLKELVGET _IOR(0x12, 106,size_t) /* elevator get */
302 #define BLKELVSET _IOW(0x12, 107,size_t) /* elevator set */
303 /* This was here just to show that the number is taken -
304 probably all these _IO(0x12,*) ioctls should be moved to blkpg.h. */
305 #endif
306 /* A jump here: 108-111 have been used for various private purposes. */
307 #define BLKBSZGET _IOR(0x12, 112,size_t)
308 #define BLKBSZSET _IOW(0x12, 113,size_t)
309 #define BLKGETSIZE64 _IOR(0x12, 114,size_t) /* return device size in bytes (u64 *arg) */
310 #define BLKTRACESETUP _IOWR(0x12, 115, struct blk_user_trace_setup)
311 #define BLKTRACESTART _IO(0x12, 116)
312 #define BLKTRACESTOP _IO(0x12, 117)
313 #define BLKTRACETEARDOWN _IO(0x12, 118)
314 #define BLKDISCARD _IO(0x12, 119)
315 #define BLKIOMIN _IO(0x12, 120)
316 #define BLKIOOPT _IO(0x12, 121)
317 #define BLKALIGNOFF _IO(0x12, 122)
318 #define BLKPBSZGET _IO(0x12, 123)
319 #define BLKDISCARDZEROES _IO(0x12, 124)
320 #define BLKSECDISCARD _IO(0x12, 125)
321
322 #define BMAP_IOCTL 1 /* obsolete - kept for compatibility */
323 #define FIBMAP _IO(0x00, 1) /* bmap access */
324 #define FIGETBSZ _IO(0x00, 2) /* get the block size used for bmap */
325 #define FIFREEZE _IOWR( 'X', 119, int) /* Freeze */
326 #define FITHAW _IOWR( 'X', 120, int) /* Thaw */
327 #define FITRIM _IOWR( 'X', 121, struct fstrim_range) /* Trim */
328
329 #define FS_IOC_GETFLAGS _IOR( 'f', 1, long)
330 #define FS_IOC_SETFLAGS _IOW( 'f', 2, long)
331 #define FS_IOC_GETVERSION _IOR( 'v', 1, long)
332 #define FS_IOC_SETVERSION _IOW( 'v', 2, long)
333 #define FS_IOC_FIEMAP _IOWR( 'f', 11, struct fiemap)
334 #define FS_IOC32_GETFLAGS _IOR( 'f', 1, int)
335 #define FS_IOC32_SETFLAGS _IOW( 'f', 2, int)
336 #define FS_IOC32_GETVERSION _IOR( 'v', 1, int)
337 #define FS_IOC32_SETVERSION _IOW( 'v', 2, int)
338
339 /*
340 * Inode flags (FS_IOC_GETFLAGS / FS_IOC_SETFLAGS)
341 */
342 #define FS_SECRM_FL 0x00000001 /* Secure deletion */
343 #define FS_UNRM_FL 0x00000002 /* Undelete */
344 #define FS_COMPR_FL 0x00000004 /* Compress file */
345 #define FS_SYNC_FL 0x00000008 /* Synchronous updates */
346 #define FS_IMMUTABLE_FL 0x00000010 /* Immutable file */
347 #define FS_APPEND_FL 0x00000020 /* writes to file may only append */
348 #define FS_NODUMP_FL 0x00000040 /* do not dump file */
349 #define FS_NOATIME_FL 0x00000080 /* do not update atime */
350 /* Reserved for compression usage... */
351 #define FS_DIRTY_FL 0x00000100
352 #define FS_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
353 #define FS_NOCOMP_FL 0x00000400 /* Don't compress */
354 #define FS_ECOMPR_FL 0x00000800 /* Compression error */
355 /* End compression flags --- maybe not all used */
356 #define FS_BTREE_FL 0x00001000 /* btree format dir */
357 #define FS_INDEX_FL 0x00001000 /* hash-indexed directory */
358 #define FS_IMAGIC_FL 0x00002000 /* AFS directory */
359 #define FS_JOURNAL_DATA_FL 0x00004000 /* Reserved for ext3 */
360 #define FS_NOTAIL_FL 0x00008000 /* file tail should not be merged */
361 #define FS_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
362 #define FS_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
363 #define FS_EXTENT_FL 0x00080000 /* Extents */
364 #define FS_DIRECTIO_FL 0x00100000 /* Use direct i/o */
365 #define FS_RESERVED_FL 0x80000000 /* reserved for ext2 lib */
366
367 #define FS_FL_USER_VISIBLE 0x0003DFFF /* User visible flags */
368 #define FS_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */
369
370
371 #define SYNC_FILE_RANGE_WAIT_BEFORE 1
372 #define SYNC_FILE_RANGE_WRITE 2
373 #define SYNC_FILE_RANGE_WAIT_AFTER 4
374
375 #ifdef __KERNEL__
376
377 #include <linux/linkage.h>
378 #include <linux/wait.h>
379 #include <linux/types.h>
380 #include <linux/kdev_t.h>
381 #include <linux/dcache.h>
382 #include <linux/path.h>
383 #include <linux/stat.h>
384 #include <linux/cache.h>
385 #include <linux/kobject.h>
386 #include <linux/list.h>
387 #include <linux/radix-tree.h>
388 #include <linux/prio_tree.h>
389 #include <linux/init.h>
390 #include <linux/pid.h>
391 #include <linux/mutex.h>
392 #include <linux/capability.h>
393 #include <linux/semaphore.h>
394 #include <linux/fiemap.h>
395
396 #include <asm/atomic.h>
397 #include <asm/byteorder.h>
398
399 struct export_operations;
400 struct hd_geometry;
401 struct iovec;
402 struct nameidata;
403 struct kiocb;
404 struct pipe_inode_info;
405 struct poll_table_struct;
406 struct kstatfs;
407 struct vm_area_struct;
408 struct vfsmount;
409 struct cred;
410
411 extern void __init inode_init( void);
412 extern void __init inode_init_early( void);
413 extern void __init files_init( unsigned long);
414
415 extern struct files_stat_struct files_stat;
416 extern unsigned long get_max_files( void);
417 extern int sysctl_nr_open;
418 extern struct inodes_stat_t inodes_stat;
419 extern int leases_enable, lease_break_time;
420
421 struct buffer_head;
422 typedef int (get_block_t)( struct inode *inode, sector_t iblock,
423 struct buffer_head *bh_result, int create);
424 typedef void (dio_iodone_t)( struct kiocb *iocb, loff_t offset,
425 ssize_t bytes, void * private, int ret,
426 bool is_async);
427
428 /*
429 * Attribute flags. These should be or-ed together to figure out what
430 * has been changed!
431 */
432 #define ATTR_MODE ( 1 << 0)
433 #define ATTR_UID ( 1 << 1)
434 #define ATTR_GID ( 1 << 2)
435 #define ATTR_SIZE ( 1 << 3)
436 #define ATTR_ATIME ( 1 << 4)
437 #define ATTR_MTIME ( 1 << 5)
438 #define ATTR_CTIME ( 1 << 6)
439 #define ATTR_ATIME_SET ( 1 << 7)
440 #define ATTR_MTIME_SET ( 1 << 8)
441 #define ATTR_FORCE ( 1 << 9) /* Not a change, but a change it */
442 #define ATTR_ATTR_FLAG ( 1 << 10)
443 #define ATTR_KILL_SUID ( 1 << 11)
444 #define ATTR_KILL_SGID ( 1 << 12)
445 #define ATTR_FILE ( 1 << 13)
446 #define ATTR_KILL_PRIV ( 1 << 14)
447 #define ATTR_OPEN ( 1 << 15) /* Truncating from open(O_TRUNC) */
448 #define ATTR_TIMES_SET ( 1 << 16)
449
450 /*
451 * This is the Inode Attributes structure, used for notify_change(). It
452 * uses the above definitions as flags, to know which values have changed.
453 * Also, in this manner, a Filesystem can look at only the values it cares
454 * about. Basically, these are the attributes that the VFS layer can
455 * request to change from the FS layer.
456 *
457 * Derek Atkins <warlord@MIT.EDU> 94-10-20
458 */
459 struct iattr {
460 unsigned int ia_valid;
461 umode_t ia_mode;
462 uid_t ia_uid;
463 gid_t ia_gid;
464 loff_t ia_size;
465 struct timespec ia_atime;
466 struct timespec ia_mtime;
467 struct timespec ia_ctime;
468
469 /*
470 * Not an attribute, but an auxilary info for filesystems wanting to
471 * implement an ftruncate() like method. NOTE: filesystem should
472 * check for (ia_valid & ATTR_FILE), and not for (ia_file != NULL).
473 */
474 struct file *ia_file;
475 };
476
477 /*
478 * Includes for diskquotas.
479 */
480 #include <linux/quota.h>
481
482 /**
483 * enum positive_aop_returns - aop return codes with specific semantics
484 *
485 * @AOP_WRITEPAGE_ACTIVATE: Informs the caller that page writeback has
486 * completed, that the page is still locked, and
487 * should be considered active. The VM uses this hint
488 * to return the page to the active list -- it won't
489 * be a candidate for writeback again in the near
490 * future. Other callers must be careful to unlock
491 * the page if they get this return. Returned by
492 * writepage();
493 *
494 * @AOP_TRUNCATED_PAGE: The AOP method that was handed a locked page has
495 * unlocked it and the page might have been truncated.
496 * The caller should back up to acquiring a new page and
497 * trying again. The aop will be taking reasonable
498 * precautions not to livelock. If the caller held a page
499 * reference, it should drop it before retrying. Returned
500 * by readpage().
501 *
502 * address_space_operation functions return these large constants to indicate
503 * special semantics to the caller. These are much larger than the bytes in a
504 * page to allow for functions that return the number of bytes operated on in a
505 * given page.
506 */
507
508 enum positive_aop_returns {
509 AOP_WRITEPAGE_ACTIVATE = 0x80000,
510 AOP_TRUNCATED_PAGE = 0x80001,
511 };
512
513 #define AOP_FLAG_UNINTERRUPTIBLE 0x0001 /* will not do a short write */
514 #define AOP_FLAG_CONT_EXPAND 0x0002 /* called from cont_expand */
515 #define AOP_FLAG_NOFS 0x0004 /* used by filesystem to direct
516 * helper code (eg buffer layer)
517 * to clear GFP_FS from alloc */
518
519 /*
520 * oh the beauties of C type declarations.
521 */
522 struct page;
523 struct address_space;
524 struct writeback_control;
525
526 struct iov_iter {
527 const struct iovec *iov;
528 unsigned long nr_segs;
529 size_t iov_offset;
530 size_t count;
531 };
532
533 size_t iov_iter_copy_from_user_atomic( struct page *page,
534 struct iov_iter *i, unsigned long offset, size_t bytes);
535 size_t iov_iter_copy_from_user( struct page *page,
536 struct iov_iter *i, unsigned long offset, size_t bytes);
537 void iov_iter_advance( struct iov_iter *i, size_t bytes);
538 int iov_iter_fault_in_readable( struct iov_iter *i, size_t bytes);
539 size_t iov_iter_single_seg_count( struct iov_iter *i);
540
541 static inline void iov_iter_init( struct iov_iter *i,
542 const struct iovec *iov, unsigned long nr_segs,
543 size_t count, size_t written)
544 {
545 i->iov = iov;
546 i->nr_segs = nr_segs;
547 i->iov_offset = 0;
548 i->count = count + written;
549
550 iov_iter_advance(i, written);
551 }
552
553 static inline size_t iov_iter_count( struct iov_iter *i)
554 {
555 return i->count;
556 }
557
558 /*
559 * "descriptor" for what we're up to with a read.
560 * This allows us to use the same read code yet
561 * have multiple different users of the data that
562 * we read from a file.
563 *
564 * The simplest case just copies the data to user
565 * mode.
566 */
567 typedef struct {
568 size_t written;
569 size_t count;
570 union {
571 char __user *buf;
572 void *data;
573 } arg;
574 int error;
575 } read_descriptor_t;
576
577 typedef int (*read_actor_t)(read_descriptor_t *, struct page *,
578 unsigned long, unsigned long);
579
580 struct address_space_operations {
581 int (*writepage)( struct page *page, struct writeback_control *wbc);
582 int (*readpage)( struct file *, struct page *);
583 void (*sync_page)( struct page *);
584
585 /* Write back some dirty pages from this mapping. */
586 int (*writepages)( struct address_space *, struct writeback_control *);
587
588 /* Set a page dirty. Return true if this dirtied it */
589 int (*set_page_dirty)( struct page *page);
590
591 int (*readpages)( struct file *filp, struct address_space *mapping,
592 struct list_head *pages, unsigned nr_pages);
593
594 int (*write_begin)( struct file *, struct address_space *mapping,
595 loff_t pos, unsigned len, unsigned flags,
596 struct page **pagep, void **fsdata);
597 int (*write_end)( struct file *, struct address_space *mapping,
598 loff_t pos, unsigned len, unsigned copied,
599 struct page *page, void *fsdata);
600
601 /* Unfortunately this kludge is needed for FIBMAP. Don't use it */
602 sector_t (*bmap)( struct address_space *, sector_t);
603 void (*invalidatepage) ( struct page *, unsigned long);
604 int (*releasepage) ( struct page *, gfp_t);
605 void (*freepage)( struct page *);
606 ssize_t (*direct_IO)( int, struct kiocb *, const struct iovec *iov,
607 loff_t offset, unsigned long nr_segs);
608 int (*get_xip_mem)( struct address_space *, pgoff_t, int,
609 void **, unsigned long *);
610 /* migrate the contents of a page to the specified target */
611 int (*migratepage) ( struct address_space *,
612 struct page *, struct page *);
613 int (*launder_page) ( struct page *);
614 int (*is_partially_uptodate) ( struct page *, read_descriptor_t *,
615 unsigned long);
616 int (*error_remove_page)( struct address_space *, struct page *);
617 };
618
619 /*
620 * pagecache_write_begin/pagecache_write_end must be used by general code
621 * to write into the pagecache.
622 */
623 int pagecache_write_begin( struct file *, struct address_space *mapping,
624 loff_t pos, unsigned len, unsigned flags,
625 struct page **pagep, void **fsdata);
626
627 int pagecache_write_end( struct file *, struct address_space *mapping,
628 loff_t pos, unsigned len, unsigned copied,
629 struct page *page, void *fsdata);
630
631 struct backing_dev_info;
632 struct address_space {
633 struct inode *host; /* owner: inode, block_device */
634 struct radix_tree_root page_tree; /* radix tree of all pages */
635 spinlock_t tree_lock; /* and lock protecting it */
636 unsigned int i_mmap_writable; /* count VM_SHARED mappings */
637 struct prio_tree_root i_mmap; /* tree of private and shared mappings */
638 struct list_head i_mmap_nonlinear; /*list VM_NONLINEAR mappings */
639 spinlock_t i_mmap_lock; /* protect tree, count, list */
640 unsigned int truncate_count; /* Cover race condition with truncate */
641 unsigned long nrpages; /* number of total pages */
642 pgoff_t writeback_index; /* writeback starts here */
643 const struct address_space_operations *a_ops; /* methods */
644 unsigned long flags; /* error bits/gfp mask */
645 struct backing_dev_info *backing_dev_info; /* device readahead, etc */
646 spinlock_t private_lock; /* for use by the address_space */
647 struct list_head private_list; /* ditto */
648 struct address_space *assoc_mapping; /* ditto */
649 } __attribute__((aligned( sizeof( long))));
650 /*
651 * On most architectures that alignment is already the case; but
652 * must be enforced here for CRIS, to let the least signficant bit
653 * of struct page's "mapping" pointer be used for PAGE_MAPPING_ANON.
654 */
655
656 struct block_device {
657 dev_t bd_dev; /* not a kdev_t - it's a search key */
658 struct inode * bd_inode; /* will die */
659 struct super_block * bd_super;
660 int bd_openers;
661 struct mutex bd_mutex; /* open/close mutex */
662 struct list_head bd_inodes;
663 void * bd_claiming;
664 void * bd_holder;
665 int bd_holders;
666 #ifdef CONFIG_SYSFS
667 struct list_head bd_holder_list;
668 #endif
669 struct block_device * bd_contains;
670 unsigned bd_block_size;
671 struct hd_struct * bd_part;
672 /* number of times partitions within this device have been opened. */
673 unsigned bd_part_count;
674 int bd_invalidated;
675 struct gendisk * bd_disk;
676 struct list_head bd_list;
677 /*
678 * Private data. You must have bd_claim'ed the block_device
679 * to use this. NOTE: bd_claim allows an owner to claim
680 * the same device multiple times, the owner must take special
681 * care to not mess up bd_private for that case.
682 */
683 unsigned long bd_private;
684
685 /* The counter of freeze processes */
686 int bd_fsfreeze_count;
687 /* Mutex for freeze */
688 struct mutex bd_fsfreeze_mutex;
689 };
690
691 /*
692 * Radix-tree tags, for tagging dirty and writeback pages within the pagecache
693 * radix trees
694 */
695 #define PAGECACHE_TAG_DIRTY 0
696 #define PAGECACHE_TAG_WRITEBACK 1
697 #define PAGECACHE_TAG_TOWRITE 2
698
699 int mapping_tagged( struct address_space *mapping, int tag);
700
701 /*
702 * Might pages of this file be mapped into userspace?
703 */
704 static inline int mapping_mapped( struct address_space *mapping)
705 {
706 return !prio_tree_empty(&mapping->i_mmap) ||
707 !list_empty(&mapping->i_mmap_nonlinear);
708 }
709
710 /*
711 * Might pages of this file have been modified in userspace?
712 * Note that i_mmap_writable counts all VM_SHARED vmas: do_mmap_pgoff
713 * marks vma as VM_SHARED if it is shared, and the file was opened for
714 * writing i.e. vma may be mprotected writable even if now readonly.
715 */
716 static inline int mapping_writably_mapped( struct address_space *mapping)
717 {
718 return mapping->i_mmap_writable != 0;
719 }
720
721 /*
722 * Use sequence counter to get consistent i_size on 32-bit processors.
723 */
724 #if BITS_PER_LONG== 32 && defined(CONFIG_SMP)
725 #include <linux/seqlock.h>
726 #define __NEED_I_SIZE_ORDERED
727 #define i_size_ordered_init(inode) seqcount_init(&inode->i_size_seqcount)
728 #else
729 #define i_size_ordered_init(inode) do { } while ( 0)
730 #endif
731
732 struct posix_acl;
733 #define ACL_NOT_CACHED (( void *)(- 1))
734
735 struct inode {
736 struct hlist_node i_hash;
737 struct list_head i_wb_list; /* backing dev IO list */
738 struct list_head i_lru; /* inode LRU list */
739 struct list_head i_sb_list;
740 struct list_head i_dentry;
741 unsigned long i_ino;
742 atomic_t i_count;
743 unsigned int i_nlink;
744 uid_t i_uid;
745 gid_t i_gid;
746 dev_t i_rdev;
747 unsigned int i_blkbits;
748 u64 i_version;
749 loff_t i_size;
750 #ifdef __NEED_I_SIZE_ORDERED
751 seqcount_t i_size_seqcount;
752 #endif
753 struct timespec i_atime;
754 struct timespec i_mtime;
755 struct timespec i_ctime;
756 blkcnt_t i_blocks;
757 unsigned short i_bytes;
758 umode_t i_mode;
759 spinlock_t i_lock; /* i_blocks, i_bytes, maybe i_size */
760 struct mutex i_mutex;
761 struct rw_semaphore i_alloc_sem;
762 const struct inode_operations *i_op;
763 const struct file_operations *i_fop; /* former ->i_op->default_file_ops */
764 struct super_block *i_sb;
765 struct file_lock *i_flock;
766 struct address_space *i_mapping;
767 struct address_space i_data;
768 #ifdef CONFIG_QUOTA
769 struct dquot *i_dquot[MAXQUOTAS];
770 #endif
771 struct list_head i_devices;
772 union {
773 struct pipe_inode_info *i_pipe;
774 struct block_device *i_bdev;
775 struct cdev *i_cdev;
776 };
777
778 __u32 i_generation;
779
780 #ifdef CONFIG_FSNOTIFY
781 __u32 i_fsnotify_mask; /* all events this inode cares about */
782 struct hlist_head i_fsnotify_marks;
783 #endif
784
785 unsigned long i_state;
786 unsigned long dirtied_when; /* jiffies of first dirtying */
787
788 unsigned int i_flags;
789
790 #ifdef CONFIG_IMA
791 /* protected by i_lock */
792 unsigned int i_readcount; /* struct files open RO */
793 #endif
794 atomic_t i_writecount;
795 #ifdef CONFIG_SECURITY
796 void *i_security;
797 #endif
798 #ifdef CONFIG_FS_POSIX_ACL
799 struct posix_acl *i_acl;
800 struct posix_acl *i_default_acl;
801 #endif
802 void *i_private; /* fs or device private pointer */
803 };
804
805 static inline int inode_unhashed( struct inode *inode)
806 {
807 return hlist_unhashed(&inode->i_hash);
808 }
809
810 /*
811 * inode->i_mutex nesting subclasses for the lock validator:
812 *
813 * 0: the object of the current VFS operation
814 * 1: parent
815 * 2: child/target
816 * 3: quota file
817 *
818 * The locking order between these classes is
819 * parent -> child -> normal -> xattr -> quota
820 */
821 enum inode_i_mutex_lock_class
822 {
823 I_MUTEX_NORMAL,
824 I_MUTEX_PARENT,
825 I_MUTEX_CHILD,
826 I_MUTEX_XATTR,
827 I_MUTEX_QUOTA
828 };
829
830 /*
831 * NOTE: in a 32bit arch with a preemptable kernel and
832 * an UP compile the i_size_read/write must be atomic
833 * with respect to the local cpu (unlike with preempt disabled),
834 * but they don't need to be atomic with respect to other cpus like in
835 * true SMP (so they need either to either locally disable irq around
836 * the read or for example on x86 they can be still implemented as a
837 * cmpxchg8b without the need of the lock prefix). For SMP compiles
838 * and 64bit archs it makes no difference if preempt is enabled or not.
839 */
840 static inline loff_t i_size_read( const struct inode *inode)
841 {
842 #if BITS_PER_LONG== 32 && defined(CONFIG_SMP)
843 loff_t i_size;
844 unsigned int seq;
845
846 do {
847 seq = read_seqcount_begin(&inode->i_size_seqcount);
848 i_size = inode->i_size;
849 } while (read_seqcount_retry(&inode->i_size_seqcount, seq));
850 return i_size;
851 #elif BITS_PER_LONG== 32 && defined(CONFIG_PREEMPT)
852 loff_t i_size;
853
854 preempt_disable();
855 i_size = inode->i_size;
856 preempt_enable();
857 return i_size;
858 #else
859 return inode->i_size;
860 #endif
861 }
862
863 /*
864 * NOTE: unlike i_size_read(), i_size_write() does need locking around it
865 * (normally i_mutex), otherwise on 32bit/SMP an update of i_size_seqcount
866 * can be lost, resulting in subsequent i_size_read() calls spinning forever.
867 */
868 static inline void i_size_write( struct inode *inode, loff_t i_size)
869 {
870 #if BITS_PER_LONG== 32 && defined(CONFIG_SMP)
871 write_seqcount_begin(&inode->i_size_seqcount);
872 inode->i_size = i_size;
873 write_seqcount_end(&inode->i_size_seqcount);
874 #elif BITS_PER_LONG== 32 && defined(CONFIG_PREEMPT)
875 preempt_disable();
876 inode->i_size = i_size;
877 preempt_enable();
878 #else
879 inode->i_size = i_size;
880 #endif
881 }
882
883 static inline unsigned iminor( const struct inode *inode)
884 {
885 return MINOR(inode->i_rdev);
886 }
887
888 static inline unsigned imajor( const struct inode *inode)
889 {
890 return MAJOR(inode->i_rdev);
891 }
892
893 extern struct block_device *I_BDEV( struct inode *inode);
894
895 struct fown_struct {
896 rwlock_t lock; /* protects pid, uid, euid fields */
897 struct pid *pid; /* pid or -pgrp where SIGIO should be sent */
898 enum pid_type pid_type; /* Kind of process group SIGIO should be sent to */
899 uid_t uid, euid; /* uid/euid of process setting the owner */
900 int signum; /* posix.1b rt signal to be delivered on IO */
901 };
902
903 /*
904 * Track a single file's readahead state
905 */
906 struct file_ra_state {
907 pgoff_t start; /* where readahead started */
908 unsigned int size; /* # of readahead pages */
909 unsigned int async_size; /* do asynchronous readahead when
910 there are only # of pages ahead */
911
912 unsigned int ra_pages; /* Maximum readahead window */
913 unsigned int mmap_miss; /* Cache miss stat for mmap accesses */
914 loff_t prev_pos; /* Cache last read() position */
915 };
916
917 /*
918 * Check if @index falls in the readahead windows.
919 */
920 static inline int ra_has_index( struct file_ra_state *ra, pgoff_t index)
921 {
922 return (index >= ra->start &&
923 index < ra->start + ra->size);
924 }
925
926 #define FILE_MNT_WRITE_TAKEN 1
927 #define FILE_MNT_WRITE_RELEASED 2
928
929 struct file {
930 /*
931 * fu_list becomes invalid after file_free is called and queued via
932 * fu_rcuhead for RCU freeing
933 */
934 union {
935 struct list_head fu_list;
936 struct rcu_head fu_rcuhead;
937 } f_u;
938 struct path f_path;
939 #define f_dentry f_path.dentry
940 #define f_vfsmnt f_path.mnt
941 const struct file_operations *f_op;
942 spinlock_t f_lock; /* f_ep_links, f_flags, no IRQ */
943 #ifdef CONFIG_SMP
944 int f_sb_list_cpu;
945 #endif
946 atomic_long_t f_count;
947 unsigned int f_flags;
948 fmode_t f_mode;
949 loff_t f_pos;
950 struct fown_struct f_owner;
951 const struct cred *f_cred;
952 struct file_ra_state f_ra;
953
954 u64 f_version;
955 #ifdef CONFIG_SECURITY
956 void *f_security;
957 #endif
958 /* needed for tty driver, and maybe others */
959 void *private_data;
960
961 #ifdef CONFIG_EPOLL
962 /* Used by fs/eventpoll.c to link all the hooks to this file */
963 struct list_head f_ep_links;
964 #endif /* #ifdef CONFIG_EPOLL */
965 struct address_space *f_mapping;
966 #ifdef CONFIG_DEBUG_WRITECOUNT
967 unsigned long f_mnt_write_state;
968 #endif
969 };
970
971 #define get_file(x) atomic_long_inc(&(x)->f_count)
972 #define fput_atomic(x) atomic_long_add_unless(&(x)->f_count, - 1, 1)
973 #define file_count(x) atomic_long_read(&(x)->f_count)
974
975 #ifdef CONFIG_DEBUG_WRITECOUNT
976 static inline void file_take_write( struct file *f)
977 {
978 WARN_ON(f->f_mnt_write_state != 0);
979 f->f_mnt_write_state = FILE_MNT_WRITE_TAKEN;
980 }
981 static inline void file_release_write( struct file *f)
982 {
983 f->f_mnt_write_state |= FILE_MNT_WRITE_RELEASED;
984 }
985 static inline void file_reset_write( struct file *f)
986 {
987 f->f_mnt_write_state = 0;
988 }
989 static inline void file_check_state( struct file *f)
990 {
991 /*
992 * At this point, either both or neither of these bits
993 * should be set.
994 */
995 WARN_ON(f->f_mnt_write_state == FILE_MNT_WRITE_TAKEN);
996 WARN_ON(f->f_mnt_write_state == FILE_MNT_WRITE_RELEASED);
997 }
998 static inline int file_check_writeable( struct file *f)
999 {
1000 if (f->f_mnt_write_state == FILE_MNT_WRITE_TAKEN)
1001 return 0;
1002 printk(KERN_WARNING "writeable file with no "
1003 "mnt_want_write()\n");
1004 WARN_ON( 1);
1005 return -EINVAL;
1006 }
1007 #else /* !CONFIG_DEBUG_WRITECOUNT */
1008 static inline void file_take_write( struct file *filp) {}
1009 static inline void file_release_write( struct file *filp) {}
1010 static inline void file_reset_write( struct file *filp) {}
1011 static inline void file_check_state( struct file *filp) {}
1012 static inline int file_check_writeable( struct file *filp)
1013 {
1014 return 0;
1015 }
1016 #endif /* CONFIG_DEBUG_WRITECOUNT */
1017
1018 #define MAX_NON_LFS ((1UL<< 31) - 1)
1019
1020 /* Page cache limit. The filesystems should put that into their s_maxbytes
1021 limits, otherwise bad things can happen in VM. */
1022 #if BITS_PER_LONG== 32
1023 #define MAX_LFS_FILESIZE (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG- 1))- 1)
1024 #elif BITS_PER_LONG== 64
1025 #define MAX_LFS_FILESIZE 0x7fffffffffffffffUL
1026 #endif
1027
1028 #define FL_POSIX 1
1029 #define FL_FLOCK 2
1030 #define FL_ACCESS 8 /* not trying to lock, just looking */
1031 #define FL_EXISTS 16 /* when unlocking, test for existence */
1032 #define FL_LEASE 32 /* lease held on this file */
1033 #define FL_CLOSE 64 /* unlock on close */
1034 #define FL_SLEEP 128 /* A blocking lock */
1035
1036 /*
1037 * Special return value from posix_lock_file() and vfs_lock_file() for
1038 * asynchronous locking.
1039 */
1040 #define FILE_LOCK_DEFERRED 1
1041
1042 /*
1043 * The POSIX file lock owner is determined by
1044 * the "struct files_struct" in the thread group
1045 * (or NULL for no owner - BSD locks).
1046 *
1047 * Lockd stuffs a "host" pointer into this.
1048 */
1049 typedef struct files_struct *fl_owner_t;
1050
1051 struct file_lock_operations {
1052 void (*fl_copy_lock)( struct file_lock *, struct file_lock *);
1053 void (*fl_release_private)( struct file_lock *);
1054 };
1055
1056 struct lock_manager_operations {
1057 int (*fl_compare_owner)( struct file_lock *, struct file_lock *);
1058 void (*fl_notify)( struct file_lock *); /* unblock callback */
1059 int (*fl_grant)( struct file_lock *, struct file_lock *, int);
1060 void (*fl_release_private)( struct file_lock *);
1061 void (*fl_break)( struct file_lock *);
1062 int (*fl_mylease)( struct file_lock *, struct file_lock *);
1063 int (*fl_change)( struct file_lock **, int);
1064 };
1065
1066 struct lock_manager {
1067 struct list_head list;
1068 };
1069
1070 void locks_start_grace( struct lock_manager *);
1071 void locks_end_grace( struct lock_manager *);
1072 int locks_in_grace( void);
1073
1074 /* that will die - we need it for nfs_lock_info */
1075 #include <linux/nfs_fs_i.h>
1076
1077 struct file_lock {
1078 struct file_lock *fl_next; /* singly linked list for this inode */
1079 struct list_head fl_link; /* doubly linked list of all locks */
1080 struct list_head fl_block; /* circular list of blocked processes */
1081 fl_owner_t fl_owner;
1082 unsigned char fl_flags;
1083 unsigned char fl_type;
1084 unsigned int fl_pid;
1085 struct pid *fl_nspid;
1086 wait_queue_head_t fl_wait;
1087 struct file *fl_file;
1088 loff_t fl_start;
1089 loff_t fl_end;
1090
1091 struct fasync_struct * fl_fasync; /* for lease break notifications */
1092 unsigned long fl_break_time; /* for nonblocking lease breaks */
1093
1094 const struct file_lock_operations *fl_ops; /* Callbacks for filesystems */
1095 const struct lock_manager_operations *fl_lmops; /* Callbacks for lockmanagers */
1096 union {
1097 struct nfs_lock_info nfs_fl;
1098 struct nfs4_lock_info nfs4_fl;
1099 struct {
1100 struct list_head link; /* link in AFS vnode's pending_locks list */
1101 int state; /* state of grant or error if -ve */
1102 } afs;
1103 } fl_u;
1104 };
1105
1106 /* The following constant reflects the upper bound of the file/locking space */
1107 #ifndef OFFSET_MAX
1108 #define INT_LIMIT(x) (~((x) 1 << ( sizeof(x)* 8 - 1)))
1109 #define OFFSET_MAX INT_LIMIT(loff_t)
1110 #define OFFT_OFFSET_MAX INT_LIMIT(off_t)
1111 #endif
1112
1113 #include <linux/fcntl.h>
1114
1115 extern void send_sigio( struct fown_struct *fown, int fd, int band);
1116
1117 #ifdef CONFIG_FILE_LOCKING
1118 extern int fcntl_getlk( struct file *, struct flock __user *);
1119 extern int fcntl_setlk( unsigned int, struct file *, unsigned int,
1120 struct flock __user *);
1121
1122 #if BITS_PER_LONG == 32
1123 extern int fcntl_getlk64( struct file *, struct flock64 __user *);
1124 extern int fcntl_setlk64( unsigned int, struct file *, unsigned int,
1125 struct flock64 __user *);
1126 #endif
1127
1128 extern int fcntl_setlease( unsigned int fd, struct file *filp, long arg);
1129 extern int fcntl_getlease( struct file *filp);
1130
1131 /* fs/locks.c */
1132 void locks_free_lock( struct file_lock *fl);
1133 extern void locks_init_lock( struct file_lock *);
1134 extern struct file_lock * locks_alloc_lock( void);
1135 extern void locks_copy_lock( struct file_lock *, struct file_lock *);
1136 extern void __locks_copy_lock( struct file_lock *, const struct file_lock *);
1137 extern void locks_remove_posix( struct file *, fl_owner_t);
1138 extern void locks_remove_flock( struct file *);
1139 extern void locks_release_private( struct file_lock *);
1140 extern void posix_test_lock( struct file *, struct file_lock *);
1141 extern int posix_lock_file( struct file *, struct file_lock *, struct file_lock *);
1142 extern int posix_lock_file_wait( struct file *, struct file_lock *);
1143 extern int posix_unblock_lock( struct file *, struct file_lock *);
1144 extern int vfs_test_lock( struct file *, struct file_lock *);
1145 extern int vfs_lock_file( struct file *, unsigned int, struct file_lock *, struct file_lock *);
1146 extern int vfs_cancel_lock( struct file *filp, struct file_lock *fl);
1147 extern int flock_lock_file_wait( struct file *filp, struct file_lock *fl);
1148 extern int __break_lease( struct inode *inode, unsigned int flags);
1149 extern void lease_get_mtime( struct inode *, struct timespec *time);
1150 extern int generic_setlease( struct file *, long, struct file_lock **);
1151 extern int vfs_setlease( struct file *, long, struct file_lock **);
1152 extern int lease_modify( struct file_lock **, int);
1153 extern int lock_may_read( struct inode *, loff_t start, unsigned long count);
1154 extern int lock_may_write( struct inode *, loff_t start, unsigned long count);
1155 extern void lock_flocks( void);
1156 extern void unlock_flocks( void);
1157 #else /* !CONFIG_FILE_LOCKING */
1158 static inline int fcntl_getlk( struct file *file, struct flock __user *user)
1159 {
1160 return -EINVAL;
1161 }
1162
1163 static inline int fcntl_setlk( unsigned int fd, struct file *file,
1164 unsigned int cmd, struct flock __user *user)
1165 {
1166 return -EACCES;
1167 }
1168
1169 #if BITS_PER_LONG == 32
1170 static inline int fcntl_getlk64( struct file *file, struct flock64 __user *user)
1171 {
1172 return -EINVAL;
1173 }
1174
1175 static inline int fcntl_setlk64( unsigned int fd, struct file *file,
1176 unsigned int cmd, struct flock64 __user *user)
1177 {
1178 return -EACCES;
1179 }
1180 #endif
1181 static inline int fcntl_setlease( unsigned int fd, struct file *filp, long arg)
1182 {
1183 return 0;
1184 }
1185
1186 static inline int fcntl_getlease( struct file *filp)
1187 {
1188 return 0;
1189 }
1190
1191 static inline void locks_init_lock( struct file_lock *fl)
1192 {
1193 return;
1194 }
1195
1196 static inline void __locks_copy_lock( struct file_lock * new, struct file_lock *fl)
1197 {
1198 return;
1199 }
1200
1201 static inline void locks_copy_lock( struct file_lock * new, struct file_lock *fl)
1202 {
1203 return;
1204 }
1205
1206 static inline void locks_remove_posix( struct file *filp, fl_owner_t owner)
1207 {
1208 return;
1209 }
1210
1211 static inline void locks_remove_flock( struct file *filp)
1212 {
1213 return;
1214 }
1215
1216 static inline void posix_test_lock( struct file *filp, struct file_lock *fl)
1217 {
1218 return;
1219 }
1220
1221 static inline int posix_lock_file( struct file *filp, struct file_lock *fl,
1222 struct file_lock *conflock)
1223 {
1224 return -ENOLCK;
1225 }
1226
1227 static inline int posix_lock_file_wait( struct file *filp, struct file_lock *fl)
1228 {
1229 return -ENOLCK;
1230 }
1231
1232 static inline int posix_unblock_lock( struct file *filp,
1233 struct file_lock *waiter)
1234 {
1235 return -ENOENT;
1236 }
1237
1238 static inline int vfs_test_lock( struct file *filp, struct file_lock *fl)
1239 {
1240 return 0;
1241 }
1242
1243 static inline int vfs_lock_file( struct file *filp, unsigned int cmd,
1244 struct file_lock *fl, struct file_lock *conf)
1245 {
1246 return -ENOLCK;
1247 }
1248
1249 static inline int vfs_cancel_lock( struct file *filp, struct file_lock *fl)
1250 {
1251 return 0;
1252 }
1253
1254 static inline int flock_lock_file_wait( struct file *filp,
1255 struct file_lock *request)
1256 {
1257 return -ENOLCK;
1258 }
1259
1260 static inline int __break_lease( struct inode *inode, unsigned int mode)
1261 {
1262 return 0;
1263 }
1264
1265 static inline void lease_get_mtime( struct inode *inode, struct timespec *time)
1266 {
1267 return;
1268 }
1269
1270 static inline int generic_setlease( struct file *filp, long arg,
1271 struct file_lock **flp)
1272 {
1273 return -EINVAL;
1274 }
1275
1276 static inline int vfs_setlease( struct file *filp, long arg,
1277 struct file_lock **lease)
1278 {
1279 return -EINVAL;
1280 }
1281
1282 static inline int lease_modify( struct file_lock **before, int arg)
1283 {
1284 return -EINVAL;
1285 }
1286
1287 static inline int lock_may_read( struct inode *inode, loff_t start,
1288 unsigned long len)
1289 {
1290 return 1;
1291 }
1292
1293 static inline int lock_may_write( struct inode *inode, loff_t start,
1294 unsigned long len)
1295 {
1296 return 1;
1297 }
1298
1299 static inline void lock_flocks( void)
1300 {
1301 }
1302
1303 static inline void unlock_flocks( void)
1304 {
1305 }
1306
1307 #endif /* !CONFIG_FILE_LOCKING */
1308
1309
1310 struct fasync_struct {
1311 spinlock_t fa_lock;
1312 int magic;
1313 int fa_fd;
1314 struct fasync_struct *fa_next; /* singly linked list */
1315 struct file *fa_file;
1316 struct rcu_head fa_rcu;
1317 };
1318
1319 #define FASYNC_MAGIC 0x4601
1320
1321 /* SMP safe fasync helpers: */
1322 extern int fasync_helper( int, struct file *, int, struct fasync_struct **);
1323 extern struct fasync_struct *fasync_insert_entry( int, struct file *, struct fasync_struct **, struct fasync_struct *);
1324 extern int fasync_remove_entry( struct file *, struct fasync_struct **);
1325 extern struct fasync_struct *fasync_alloc( void);
1326 extern void fasync_free( struct fasync_struct *);
1327
1328 /* can be called from interrupts */
1329 extern void kill_fasync( struct fasync_struct **, int, int);
1330
1331 extern int __f_setown( struct file *filp, struct pid *, enum pid_type, int force);
1332 extern int f_setown( struct file *filp, unsigned long arg, int force);
1333 extern void f_delown( struct file *filp);
1334 extern pid_t f_getown( struct file *filp);
1335 extern int send_sigurg( struct fown_struct *fown);
1336
1337 /*
1338 * Umount options
1339 */
1340
1341 #define MNT_FORCE 0x00000001 /* Attempt to forcibily umount */
1342 #define MNT_DETACH 0x00000002 /* Just detach from the tree */
1343 #define MNT_EXPIRE 0x00000004 /* Mark for expiry */
1344 #define UMOUNT_NOFOLLOW 0x00000008 /* Don't follow symlink on umount */
1345 #define UMOUNT_UNUSED 0x80000000 /* Flag guaranteed to be unused */
1346
1347 extern struct list_head super_blocks;
1348 extern spinlock_t sb_lock;
1349
1350 struct super_block {
1351 struct list_head s_list; /* Keep this first */
1352 dev_t s_dev; /* search index; _not_ kdev_t */
1353 unsigned char s_dirt;
1354 unsigned char s_blocksize_bits;
1355 unsigned long s_blocksize;
1356 loff_t s_maxbytes; /* Max file size */
1357 struct file_system_type *s_type;
1358 const struct super_operations *s_op;
1359 const struct dquot_operations *dq_op;
1360 const struct quotactl_ops *s_qcop;
1361 const struct export_operations *s_export_op;
1362 unsigned long s_flags;
1363 unsigned long s_magic;
1364 struct dentry *s_root;
1365 struct rw_semaphore s_umount;
1366 struct mutex s_lock;
1367 int s_count;
1368 atomic_t s_active;
1369 #ifdef CONFIG_SECURITY
1370 void *s_security;
1371 #endif
1372 const struct xattr_handler **s_xattr;
1373
1374 struct list_head s_inodes; /* all inodes */
1375 struct hlist_head s_anon; /* anonymous dentries for (nfs) exporting */
1376 #ifdef CONFIG_SMP
1377 struct list_head __percpu *s_files;
1378 #else
1379 struct list_head s_files;
1380 #endif
1381 /* s_dentry_lru and s_nr_dentry_unused are protected by dcache_lock */
1382 struct list_head s_dentry_lru; /* unused dentry lru */
1383 int s_nr_dentry_unused; /* # of dentry on lru */
1384
1385 struct block_device *s_bdev;
1386 struct backing_dev_info *s_bdi;
1387 struct mtd_info *s_mtd;
1388 struct list_head s_instances;
1389 struct quota_info s_dquot; /* Diskquota specific options */
1390
1391 int s_frozen;
1392 wait_queue_head_t s_wait_unfrozen;
1393
1394 char s_id[ 32]; /* Informational name */
1395
1396 void *s_fs_info; /* Filesystem private info */
1397 fmode_t s_mode;
1398
1399 /* Granularity of c/m/atime in ns.
1400 Cannot be worse than a second */
1401 u32 s_time_gran;
1402
1403 /*
1404 * The next field is for VFS *only*. No filesystems have any business
1405 * even looking at it. You had been warned.
1406 */
1407 struct mutex s_vfs_rename_mutex; /* Kludge */
1408
1409 /*
1410 * Filesystem subtype. If non-empty the filesystem type field
1411 * in /proc/mounts will be "type.subtype"
1412 */
1413 char *s_subtype;
1414
1415 /*
1416 * Saved mount options for lazy filesystems using
1417 * generic_show_options()
1418 */
1419 char __rcu *s_options;
1420 };
1421
1422 extern struct timespec current_fs_time( struct super_block *sb);
1423
1424 /*
1425 * Snapshotting support.
1426 */
1427 enum {
1428 SB_UNFROZEN = 0,
1429 SB_FREEZE_WRITE = 1,
1430 SB_FREEZE_TRANS = 2,
1431 };
1432
1433 #define vfs_check_frozen(sb, level) \
1434 wait_event((sb)->s_wait_unfrozen, ((sb)->s_frozen < (level)))
1435
1436 #define get_fs_excl() atomic_inc(¤t->fs_excl)
1437 #define put_fs_excl() atomic_dec(¤t->fs_excl)
1438 #define has_fs_excl() atomic_read(¤t->fs_excl)
1439
1440 #define is_owner_or_cap(inode) \
1441 ((current_fsuid() == (inode)->i_uid) || capable(CAP_FOWNER))
1442
1443 /* not quite ready to be deprecated, but... */
1444 extern void lock_super( struct super_block *);
1445 extern void unlock_super( struct super_block *);
1446
1447 /*
1448 * VFS helper functions..
1449 */
1450 extern int vfs_create( struct inode *, struct dentry *, int, struct nameidata *);
1451 extern int vfs_mkdir( struct inode *, struct dentry *, int);
1452 extern int vfs_mknod( struct inode *, struct dentry *, int, dev_t);
1453 extern int vfs_symlink( struct inode *, struct dentry *, const char *);
1454 extern int vfs_link( struct dentry *, struct inode *, struct dentry *);
1455 extern int vfs_rmdir( struct inode *, struct dentry *);
1456 extern int vfs_unlink( struct inode *, struct dentry *);
1457 extern int vfs_rename( struct inode *, struct dentry *, struct inode *, struct dentry *);
1458
1459 /*
1460 * VFS dentry helper functions.
1461 */
1462 extern void dentry_unhash( struct dentry *dentry);
1463
1464 /*
1465 * VFS file helper functions.
1466 */
1467 extern int file_permission( struct file *, int);
1468 extern void inode_init_owner( struct inode *inode, const struct inode *dir,
1469 mode_t mode);
1470 /*
1471 * VFS FS_IOC_FIEMAP helper definitions.
1472 */
1473 struct fiemap_extent_info {
1474 unsigned int fi_flags; /* Flags as passed from user */
1475 unsigned int fi_extents_mapped; /* Number of mapped extents */
1476 unsigned int fi_extents_max; /* Size of fiemap_extent array */
1477 struct fiemap_extent *fi_extents_start; /* Start of fiemap_extent
1478 * array */
1479 };
1480 int fiemap_fill_next_extent( struct fiemap_extent_info *info, u64 logical,
1481 u64 phys, u64 len, u32 flags);
1482 int fiemap_check_flags( struct fiemap_extent_info *fieinfo, u32 fs_flags);
1483
1484 /*
1485 * File types
1486 *
1487 * NOTE! These match bits 12..15 of stat.st_mode
1488 * (ie "(i_mode >> 12) & 15").
1489 */
1490 #define DT_UNKNOWN 0
1491 #define DT_FIFO 1
1492 #define DT_CHR 2
1493 #define DT_DIR 4
1494 #define DT_BLK 6
1495 #define DT_REG 8
1496 #define DT_LNK 10
1497 #define DT_SOCK 12
1498 #define DT_WHT 14
1499
1500 /*
1501 * This is the "filldir" function type, used by readdir() to let
1502 * the kernel specify what kind of dirent layout it wants to have.
1503 * This allows the kernel to read directories into kernel space or
1504 * to have different dirent layouts depending on the binary type.
1505 */
1506 typedef int (*filldir_t)( void *, const char *, int, loff_t, u64, unsigned);
1507 struct block_device_operations;
1508
1509 /* These macros are for out of kernel modules to test that
1510 * the kernel supports the unlocked_ioctl and compat_ioctl
1511 * fields in struct file_operations. */
1512 #define HAVE_COMPAT_IOCTL 1
1513 #define HAVE_UNLOCKED_IOCTL 1
1514
1515 /*
1516 * NOTE:
1517 * all file operations except setlease can be called without
1518 * the big kernel lock held in all filesystems.
1519 */
1520 struct file_operations {
1521 struct module *owner;
1522 loff_t (*llseek) ( struct file *, loff_t, int);
1523 ssize_t (*read) ( struct file *, char __user *, size_t, loff_t *);
1524 ssize_t (*write) ( struct file *, const char __user *, size_t, loff_t *);
1525 ssize_t (*aio_read) ( struct kiocb *, const struct iovec *, unsigned long, loff_t);
1526 ssize_t (*aio_write) ( struct kiocb *, const struct iovec *, unsigned long, loff_t);
1527 int (*readdir) ( struct file *, void *, filldir_t);
1528 unsigned int (*poll) ( struct file *, struct poll_table_struct *);
1529 long (*unlocked_ioctl) ( struct file *, unsigned int, unsigned long);
1530 long (*compat_ioctl) ( struct file *, unsigned int, unsigned long);
1531 int (*mmap) ( struct file *, struct vm_area_struct *);
1532 int (*open) ( struct inode *, struct file *);
1533 int (*flush) ( struct file *, fl_owner_t id);
1534 int (*release) ( struct inode *, struct file *);
1535 int (*fsync) ( struct file *, int datasync);
1536 int (*aio_fsync) ( struct kiocb *, int datasync);
1537 int (*fasync) ( int, struct file *, int);
1538 int (*lock) ( struct file *, int, struct file_lock *);
1539 ssize_t (*sendpage) ( struct file *, struct page *, int, size_t, loff_t *, int);
1540 unsigned long (*get_unmapped_area)( struct file *, unsigned long, unsigned long, unsigned long, unsigned long);
1541 int (*check_flags)( int);
1542 int (*flock) ( struct file *, int, struct file_lock *);
1543 ssize_t (*splice_write)( struct pipe_inode_info *, struct file *, loff_t *, size_t, unsigned int);
1544 ssize_t (*splice_read)( struct file *, loff_t *, struct pipe_inode_info *, size_t, unsigned int);
1545 int (*setlease)( struct file *, long, struct file_lock **);
1546 };
1547
1548 struct inode_operations {
1549 int (*create) ( struct inode *, struct dentry *, int, struct nameidata *);
1550 struct dentry * (*lookup) ( struct inode *, struct dentry *, struct nameidata *);
1551 int (*link) ( struct dentry *, struct inode *, struct dentry *);
1552 int (*unlink) ( struct inode *, struct dentry *);
1553 int (*symlink) ( struct inode *, struct dentry *, const char *);
1554 int (*mkdir) ( struct inode *, struct dentry *, int);
1555 int (*rmdir) ( struct inode *, struct dentry *);
1556 int (*mknod) ( struct inode *, struct dentry *, int,dev_t);
1557 int (*rename) ( struct inode *, struct dentry *,
1558 struct inode *, struct dentry *);
1559 int (*readlink) ( struct dentry *, char __user *, int);
1560 void * (*follow_link) ( struct dentry *, struct nameidata *);
1561 void (*put_link) ( struct dentry *, struct nameidata *, void *);
1562 void (*truncate) ( struct inode *);
1563 int (*permission) ( struct inode *, int);
1564 int (*check_acl)( struct inode *, int);
1565 int (*setattr) ( struct dentry *, struct iattr *);
1566 int (*getattr) ( struct vfsmount *mnt, struct dentry *, struct kstat *);
1567 int (*setxattr) ( struct dentry *, const char *, const void *,size_t, int);
1568 ssize_t (*getxattr) ( struct dentry *, const char *, void *, size_t);
1569 ssize_t (*listxattr) ( struct dentry *, char *, size_t);
1570 int (*removexattr) ( struct dentry *, const char *);
1571 void (*truncate_range)( struct inode *, loff_t, loff_t);
1572 long (*fallocate)( struct inode *inode, int mode, loff_t offset,
1573 loff_t len);
1574 int (*fiemap)( struct inode *, struct fiemap_extent_info *, u64 start,
1575 u64 len);
1576 };
1577
1578 struct seq_file;
1579
1580 ssize_t rw_copy_check_uvector( int type, const struct iovec __user * uvector,
1581 unsigned long nr_segs, unsigned long fast_segs,
1582 struct iovec *fast_pointer,
1583 struct iovec **ret_pointer);
1584
1585 extern ssize_t vfs_read( struct file *, char __user *, size_t, loff_t *);
1586 extern ssize_t vfs_write( struct file *, const char __user *, size_t, loff_t *);
1587 extern ssize_t vfs_readv( struct file *, const struct iovec __user *,
1588 unsigned long, loff_t *);
1589 extern ssize_t vfs_writev( struct file *, const struct iovec __user *,
1590 unsigned long, loff_t *);
1591
1592 struct super_operations {
1593 struct inode *(*alloc_inode)( struct super_block *sb);
1594 void (*destroy_inode)( struct inode *);
1595
1596 void (*dirty_inode) ( struct inode *);
1597 int (*write_inode) ( struct inode *, struct writeback_control *wbc);
1598 int (*drop_inode) ( struct inode *);
1599 void (*evict_inode) ( struct inode *);
1600 void (*put_super) ( struct super_block *);
1601 void (*write_super) ( struct super_block *);
1602 int (*sync_fs)( struct super_block *sb, int wait);
1603 int (*freeze_fs) ( struct super_block *);
1604 int (*unfreeze_fs) ( struct super_block *);
1605 int (*statfs) ( struct dentry *, struct kstatfs *);
1606 int (*remount_fs) ( struct super_block *, int *, char *);
1607 void (*umount_begin) ( struct super_block *);
1608
1609 int (*show_options)( struct seq_file *, struct vfsmount *);
1610 int (*show_stats)( struct seq_file *, struct vfsmount *);
1611 #ifdef CONFIG_QUOTA
1612 ssize_t (*quota_read)( struct super_block *, int, char *, size_t, loff_t);
1613 ssize_t (*quota_write)( struct super_block *, int, const char *, size_t, loff_t);
1614 #endif
1615 int (*bdev_try_to_free_page)( struct super_block*, struct page*, gfp_t);
1616 };
1617
1618 /*
1619 * Inode state bits. Protected by inode_lock.
1620 *
1621 * Three bits determine the dirty state of the inode, I_DIRTY_SYNC,
1622 * I_DIRTY_DATASYNC and I_DIRTY_PAGES.
1623 *
1624 * Four bits define the lifetime of an inode. Initially, inodes are I_NEW,
1625 * until that flag is cleared. I_WILL_FREE, I_FREEING and I_CLEAR are set at
1626 * various stages of removing an inode.
1627 *
1628 * Two bits are used for locking and completion notification, I_NEW and I_SYNC.
1629 *
1630 * I_DIRTY_SYNC Inode is dirty, but doesn't have to be written on
1631 * fdatasync(). i_atime is the usual cause.
1632 * I_DIRTY_DATASYNC Data-related inode changes pending. We keep track of
1633 * these changes separately from I_DIRTY_SYNC so that we
1634 * don't have to write inode on fdatasync() when only
1635 * mtime has changed in it.
1636 * I_DIRTY_PAGES Inode has dirty pages. Inode itself may be clean.
1637 * I_NEW Serves as both a mutex and completion notification.
1638 * New inodes set I_NEW. If two processes both create
1639 * the same inode, one of them will release its inode and
1640 * wait for I_NEW to be released before returning.
1641 * Inodes in I_WILL_FREE, I_FREEING or I_CLEAR state can
1642 * also cause waiting on I_NEW, without I_NEW actually
1643 * being set. find_inode() uses this to prevent returning
1644 * nearly-dead inodes.
1645 * I_WILL_FREE Must be set when calling write_inode_now() if i_count
1646 * is zero. I_FREEING must be set when I_WILL_FREE is
1647 * cleared.
1648 * I_FREEING Set when inode is about to be freed but still has dirty
1649 * pages or buffers attached or the inode itself is still
1650 * dirty.
1651 * I_CLEAR Added by end_writeback(). In this state the inode is clean
1652 * and can be destroyed. Inode keeps I_FREEING.
1653 *
1654 * Inodes that are I_WILL_FREE, I_FREEING or I_CLEAR are
1655 * prohibited for many purposes. iget() must wait for
1656 * the inode to be completely released, then create it
1657 * anew. Other functions will just ignore such inodes,
1658 * if appropriate. I_NEW is used for waiting.
1659 *
1660 * I_SYNC Synchonized write of dirty inode data. The bits is
1661 * set during data writeback, and cleared with a wakeup
1662 * on the bit address once it is done.
1663 *
1664 * Q: What is the difference between I_WILL_FREE and I_FREEING?
1665 */
1666 #define I_DIRTY_SYNC ( 1 << 0)
1667 #define I_DIRTY_DATASYNC ( 1 << 1)
1668 #define I_DIRTY_PAGES ( 1 << 2)
1669 #define __I_NEW 3
1670 #define I_NEW ( 1 << __I_NEW)
1671 #define I_WILL_FREE ( 1 << 4)
1672 #define I_FREEING ( 1 << 5)
1673 #define I_CLEAR ( 1 << 6)
1674 #define __I_SYNC 7
1675 #define I_SYNC ( 1 << __I_SYNC)
1676 #define I_REFERENCED ( 1 << 8)
1677
1678 #define I_DIRTY (I_DIRTY_SYNC | I_DIRTY_DATASYNC | I_DIRTY_PAGES)
1679
1680 extern void __mark_inode_dirty( struct inode *, int);
1681 static inline void mark_inode_dirty( struct inode *inode)
1682 {
1683 __mark_inode_dirty(inode, I_DIRTY);
1684 }
1685
1686 static inline void mark_inode_dirty_sync( struct inode *inode)
1687 {
1688 __mark_inode_dirty(inode, I_DIRTY_SYNC);
1689 }
1690
1691 /**
1692 * inc_nlink - directly increment an inode's link count
1693 * @inode: inode
1694 *
1695 * This is a low-level filesystem helper to replace any
1696 * direct filesystem manipulation of i_nlink. Currently,
1697 * it is only here for parity with dec_nlink().
1698 */
1699 static inline void inc_nlink( struct inode *inode)
1700 {
1701 inode->i_nlink++;
1702 }
1703
1704 static inline void inode_inc_link_count( struct inode *inode)
1705 {
1706 inc_nlink(inode);
1707 mark_inode_dirty(inode);
1708 }
1709
1710 /**
1711 * drop_nlink - directly drop an inode's link count
1712 * @inode: inode
1713 *
1714 * This is a low-level filesystem helper to replace any
1715 * direct filesystem manipulation of i_nlink. In cases
1716 * where we are attempting to track writes to the
1717 * filesystem, a decrement to zero means an imminent
1718 * write when the file is truncated and actually unlinked
1719 * on the filesystem.
1720 */
1721 static inline void drop_nlink( struct inode *inode)
1722 {
1723 inode->i_nlink--;
1724 }
1725
1726 /**
1727 * clear_nlink - directly zero an inode's link count
1728 * @inode: inode
1729 *
1730 * This is a low-level filesystem helper to replace any
1731 * direct filesystem manipulation of i_nlink. See
1732 * drop_nlink() for why we care about i_nlink hitting zero.
1733 */
1734 static inline void clear_nlink( struct inode *inode)
1735 {
1736 inode->i_nlink = 0;
1737 }
1738
1739 static inline void inode_dec_link_count( struct inode *inode)
1740 {
1741 drop_nlink(inode);
1742 mark_inode_dirty(inode);
1743 }
1744
1745 /**
1746 * inode_inc_iversion - increments i_version
1747 * @inode: inode that need to be updated
1748 *
1749 * Every time the inode is modified, the i_version field will be incremented.
1750 * The filesystem has to be mounted with i_version flag
1751 */
1752
1753 static inline void inode_inc_iversion( struct inode *inode)
1754 {
1755 spin_lock(&inode->i_lock);
1756 inode->i_version++;
1757 spin_unlock(&inode->i_lock);
1758 }
1759
1760 extern void touch_atime( struct vfsmount *mnt, struct dentry *dentry);
1761 static inline void file_accessed( struct file *file)
1762 {
1763 if (!(file->f_flags & O_NOATIME))
1764 touch_atime(file->f_path.mnt, file->f_path.dentry);
1765 }
1766
1767 int sync_inode( struct inode *inode, struct writeback_control *wbc);
1768 int sync_inode_metadata( struct inode *inode, int wait);
1769
1770 struct file_system_type {
1771 const char *name;
1772 int fs_flags;
1773 int (*get_sb) ( struct file_system_type *, int,
1774 const char *, void *, struct vfsmount *);
1775 struct dentry *(*mount) ( struct file_system_type *, int,
1776 const char *, void *);
1777 void (*kill_sb) ( struct super_block *);
1778 struct module *owner;
1779 struct file_system_type * next;
1780 struct list_head fs_supers;
1781
1782 struct lock_class_key s_lock_key;
1783 struct lock_class_key s_umount_key;
1784 struct lock_class_key s_vfs_rename_key;
1785
1786 struct lock_class_key i_lock_key;
1787 struct lock_class_key i_mutex_key;
1788 struct lock_class_key i_mutex_dir_key;
1789 struct lock_class_key i_alloc_sem_key;
1790 };
1791
1792 extern struct dentry *mount_ns( struct file_system_type *fs_type, int flags,
1793 void *data, int (*fill_super)( struct super_block *, void *, int));
1794 extern struct dentry *mount_bdev( struct file_system_type *fs_type,
1795 int flags, const char *dev_name, void *data,
1796 int (*fill_super)( struct super_block *, void *, int));
1797 extern int get_sb_bdev( struct file_system_type *fs_type,
1798 int flags, const char *dev_name, void *data,
1799 int (*fill_super)( struct super_block *, void *, int),
1800 struct vfsmount *mnt);
1801 extern struct dentry *mount_single( struct file_system_type *fs_type,
1802 int flags, void *data,
1803 int (*fill_super)( struct super_block *, void *, int));
1804 extern int get_sb_single( struct file_system_type *fs_type,
1805 int flags, void *data,
1806 int (*fill_super)( struct super_block *, void *, int),
1807 struct vfsmount *mnt);
1808 extern struct dentry *mount_nodev( struct file_system_type *fs_type,
1809 int flags, void *data,
1810 int (*fill_super)( struct super_block *, void *, int));
1811 extern int get_sb_nodev( struct file_system_type *fs_type,
1812 int flags, void *data,
1813 int (*fill_super)( struct super_block *, void *, int),
1814 struct vfsmount *mnt);
1815 void generic_shutdown_super( struct super_block *sb);
1816 void kill_block_super( struct super_block *sb);
1817 void kill_anon_super( struct super_block *sb);
1818 void kill_litter_super( struct super_block *sb);
1819 void deactivate_super( struct super_block *sb);
1820 void deactivate_locked_super( struct super_block *sb);
1821 int set_anon_super( struct super_block *s, void *data);
1822 struct super_block *sget( struct file_system_type *type,
1823 int (*test)( struct super_block *, void *),
1824 int (*set)( struct super_block *, void *),
1825 void *data);
1826 extern struct dentry *mount_pseudo( struct file_system_type *, char *,
1827 const struct super_operations *ops, unsigned long);
1828 extern void simple_set_mnt( struct vfsmount *mnt, struct super_block *sb);
1829
1830 static inline void sb_mark_dirty( struct super_block *sb)
1831 {
1832 sb->s_dirt = 1;
1833 }
1834 static inline void sb_mark_clean( struct super_block *sb)
1835 {
1836 sb->s_dirt = 0;
1837 }
1838 static inline int sb_is_dirty( struct super_block *sb)
1839 {
1840 return sb->s_dirt;
1841 }
1842
1843 /* Alas, no aliases. Too much hassle with bringing module.h everywhere */
1844 #define fops_get(fops) \
1845 (((fops) && try_module_get((fops)->owner) ? (fops) : NULL))
1846 #define fops_put(fops) \
1847 do { if (fops) module_put((fops)->owner); } while( 0)
1848
1849 extern int register_filesystem( struct file_system_type *);
1850 extern int unregister_filesystem( struct file_system_type *);
1851 extern struct vfsmount *kern_mount_data( struct file_system_type *, void *data);
1852 #define kern_mount(type) kern_mount_data(type, NULL)
1853 extern int may_umount_tree( struct vfsmount *);
1854 extern int may_umount( struct vfsmount *);
1855 extern long do_mount( char *, char *, char *, unsigned long, void *);
1856 extern struct vfsmount *collect_mounts( struct path *);
1857 extern void drop_collected_mounts( struct vfsmount *);
1858 extern int iterate_mounts( int (*)( struct vfsmount *, void *), void *,
1859 struct vfsmount *);
1860 extern int vfs_statfs( struct path *, struct kstatfs *);
1861 extern int statfs_by_dentry( struct dentry *, struct kstatfs *);
1862 extern int freeze_super( struct super_block *super);
1863 extern int thaw_super( struct super_block *super);
1864
1865 extern int current_umask( void);
1866
1867 /* /sys/fs */
1868 extern struct kobject *fs_kobj;
1869
1870 #define MAX_RW_COUNT (INT_MAX & PAGE_CACHE_MASK)
1871 extern int rw_verify_area( int, struct file *, loff_t *, size_t);
1872
1873 #define FLOCK_VERIFY_READ 1
1874 #define FLOCK_VERIFY_WRITE 2
1875
1876 #ifdef CONFIG_FILE_LOCKING
1877 extern int locks_mandatory_locked( struct inode *);
1878 extern int locks_mandatory_area( int, struct inode *, struct file *, loff_t, size_t);
1879
1880 /*
1881 * Candidates for mandatory locking have the setgid bit set
1882 * but no group execute bit - an otherwise meaningless combination.
1883 */
1884
1885 static inline int __mandatory_lock( struct inode *ino)
1886 {
1887 return (ino->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID;
1888 }
1889
1890 /*
1891 * ... and these candidates should be on MS_MANDLOCK mounted fs,
1892 * otherwise these will be advisory locks
1893 */
1894
1895 static inline int mandatory_lock( struct inode *ino)
1896 {
1897 return IS_MANDLOCK(ino) && __mandatory_lock(ino);
1898 }
1899
1900 static inline int locks_verify_locked( struct inode *inode)
1901 {
1902 if (mandatory_lock(inode))
1903 return locks_mandatory_locked(inode);
1904 return 0;
1905 }
1906
1907 static inline int locks_verify_truncate( struct inode *inode,
1908 struct file *filp,
1909 loff_t size)
1910 {
1911 if (inode->i_flock && mandatory_lock(inode))
1912 return locks_mandatory_area(
1913 FLOCK_VERIFY_WRITE, inode, filp,
1914 size < inode->i_size ? size : inode->i_size,
1915 (size < inode->i_size ? inode->i_size - size
1916 : size - inode->i_size)
1917 );
1918 return 0;
1919 }
1920
1921 static inline int break_lease( struct inode *inode, unsigned int mode)
1922 {
1923 if (inode->i_flock)
1924 return __break_lease(inode, mode);
1925 return 0;
1926 }
1927 #else /* !CONFIG_FILE_LOCKING */
1928 static inline int locks_mandatory_locked( struct inode *inode)
1929 {
1930 return 0;
1931 }
1932
1933 static inline int locks_mandatory_area( int rw, struct inode *inode,
1934 struct file *filp, loff_t offset,
1935 size_t count)
1936 {
1937 return 0;
1938 }
1939
1940 static inline int __mandatory_lock( struct inode *inode)
1941 {
1942 return 0;
1943 }
1944
1945 static inline int mandatory_lock( struct inode *inode)
1946 {
1947 return 0;
1948 }
1949
1950 static inline int locks_verify_locked( struct inode *inode)
1951 {
1952 return 0;
1953 }
1954
1955 static inline int locks_verify_truncate( struct inode *inode, struct file *filp,
1956 size_t size)
1957 {
1958 return 0;
1959 }
1960
1961 static inline int break_lease( struct inode *inode, unsigned int mode)
1962 {
1963 return 0;
1964 }
1965
1966 #endif /* CONFIG_FILE_LOCKING */
1967
1968 /* fs/open.c */
1969
1970 extern int do_truncate( struct dentry *, loff_t start, unsigned int time_attrs,
1971 struct file *filp);
1972 extern int do_fallocate( struct file *file, int mode, loff_t offset,
1973 loff_t len);
1974 extern long do_sys_open( int dfd, const char __user *filename, int flags,
1975 int mode);
1976 extern struct file *filp_open( const char *, int, int);
1977 extern struct file * dentry_open( struct dentry *, struct vfsmount *, int,
1978 const struct cred *);
1979 extern int filp_close( struct file *, fl_owner_t id);
1980 extern char * getname( const char __user *);
1981
1982 /* fs/ioctl.c */
1983
1984 extern int ioctl_preallocate( struct file *filp, void __user *argp);
1985
1986 /* fs/dcache.c */
1987 extern void __init vfs_caches_init_early( void);
1988 extern void __init vfs_caches_init( unsigned long);
1989
1990 extern struct kmem_cache *names_cachep;
1991
1992 #define __getname_gfp(gfp) kmem_cache_alloc(names_cachep, (gfp))
1993 #define __getname() __getname_gfp(GFP_KERNEL)
1994 #define __putname(name) kmem_cache_free(names_cachep, ( void *)(name))
1995 #ifndef CONFIG_AUDITSYSCALL
1996 #define putname(name) __putname(name)
1997 #else
1998 extern void putname( const char *name);
1999 #endif
2000
2001 #ifdef CONFIG_BLOCK
2002 extern int register_blkdev( unsigned int, const char *);
2003 extern void unregister_blkdev( unsigned int, const char *);
2004 extern struct block_device *bdget(dev_t);
2005 extern struct block_device *bdgrab( struct block_device *bdev);
2006 extern void bd_set_size( struct block_device *, loff_t size);
2007 extern void bd_forget( struct inode *inode);
2008 extern void bdput( struct block_device *);
2009 extern struct block_device *open_by_devnum(dev_t, fmode_t);
2010 extern void invalidate_bdev( struct block_device *);
2011 extern int sync_blockdev( struct block_device *bdev);
2012 extern struct super_block *freeze_bdev( struct block_device *);
2013 extern void emergency_thaw_all( void);
2014 extern int thaw_bdev( struct block_device *bdev, struct super_block *sb);
2015 extern int fsync_bdev( struct block_device *);
2016 #else
2017 static inline void bd_forget( struct inode *inode) {}
2018 static inline int sync_blockdev( struct block_device *bdev) { return 0; }
2019 static inline void invalidate_bdev( struct block_device *bdev) {}
2020
2021 static inline struct super_block *freeze_bdev( struct block_device *sb)
2022 {
2023 return NULL;
2024 }
2025
2026 static inline int thaw_bdev( struct block_device *bdev, struct super_block *sb)
2027 {
2028 return 0;
2029 }
2030 #endif
2031 extern int sync_filesystem( struct super_block *);
2032 extern const struct file_operations def_blk_fops;
2033 extern const struct file_operations def_chr_fops;
2034 extern const struct file_operations bad_sock_fops;
2035 extern const struct file_operations def_fifo_fops;
2036 #ifdef CONFIG_BLOCK
2037 extern int ioctl_by_bdev( struct block_device *, unsigned, unsigned long);
2038 extern int blkdev_ioctl( struct block_device *, fmode_t, unsigned, unsigned long);
2039 extern long compat_blkdev_ioctl( struct file *, unsigned, unsigned long);
2040 extern int blkdev_get( struct block_device *, fmode_t);
2041 extern int blkdev_put( struct block_device *, fmode_t);
2042 extern int bd_claim( struct block_device *, void *);
2043 extern void bd_release( struct block_device *);
2044 #ifdef CONFIG_SYSFS
2045 extern int bd_claim_by_disk( struct block_device *, void *, struct gendisk *);
2046 extern void bd_release_from_disk( struct block_device *, struct gendisk *);
2047 #else
2048 #define bd_claim_by_disk(bdev, holder, disk) bd_claim(bdev, holder)
2049 #define bd_release_from_disk(bdev, disk) bd_release(bdev)
2050 #endif
2051 #endif
2052
2053 /* fs/char_dev.c */
2054 #define CHRDEV_MAJOR_HASH_SIZE 255
2055 extern int alloc_chrdev_region(dev_t *, unsigned, unsigned, const char *);
2056 extern int register_chrdev_region(dev_t, unsigned, const char *);
2057 extern int __register_chrdev( unsigned int major, unsigned int baseminor,
2058 unsigned int count, const char *name,
2059 const struct file_operations *fops);
2060 extern void __unregister_chrdev( unsigned int major, unsigned int baseminor,
2061 unsigned int count, const char *name);
2062 extern void unregister_chrdev_region(dev_t, unsigned);
2063 extern void chrdev_show( struct seq_file *,off_t);
2064
2065 static inline int register_chrdev( unsigned int major, const char *name,
2066 const struct file_operations *fops)
2067 {
2068 return __register_chrdev(major, 0, 256, name, fops);
2069 }
2070
2071 static inline void unregister_chrdev( unsigned int major, const char *name)
2072 {
2073 __unregister_chrdev(major, 0, 256, name);
2074 }
2075
2076 /* fs/block_dev.c */
2077 #define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */
2078 #define BDEVT_SIZE 10 /* Largest string for MAJ:MIN for blkdev */
2079
2080 #ifdef CONFIG_BLOCK
2081 #define BLKDEV_MAJOR_HASH_SIZE 255
2082 extern const char *__bdevname(dev_t, char *buffer);
2083 extern const char *bdevname( struct block_device *bdev, char *buffer);
2084 extern struct block_device *lookup_bdev( const char *);
2085 extern struct block_device *open_bdev_exclusive( const char *, fmode_t, void *);
2086 extern void close_bdev_exclusive( struct block_device *, fmode_t);
2087 extern void blkdev_show( struct seq_file *,off_t);
2088
2089 #else
2090 #define BLKDEV_MAJOR_HASH_SIZE 0
2091 #endif
2092
2093 extern void init_special_inode( struct inode *, umode_t, dev_t);
2094
2095 /* Invalid inode operations -- fs/bad_inode.c */
2096 extern void make_bad_inode( struct inode *);
2097 extern int is_bad_inode( struct inode *);
2098
2099 extern const struct file_operations read_pipefifo_fops;
2100 extern const struct file_operations write_pipefifo_fops;
2101 extern const struct file_operations rdwr_pipefifo_fops;
2102
2103 extern int fs_may_remount_ro( struct super_block *);
2104
2105 #ifdef CONFIG_BLOCK
2106 /*
2107 * return READ, READA, or WRITE
2108 */
2109 #define bio_rw(bio) ((bio)->bi_rw & (RW_MASK | RWA_MASK))
2110
2111 /*
2112 * return data direction, READ or WRITE
2113 */
2114 #define bio_data_dir(bio) ((bio)->bi_rw & 1)
2115
2116 extern void check_disk_size_change( struct gendisk *disk,
2117 struct block_device *bdev);
2118 extern int revalidate_disk( struct gendisk *);
2119 extern int check_disk_change( struct block_device *);
2120 extern int __invalidate_device( struct block_device *);
2121 extern int invalidate_partition( struct gendisk *, int);
2122 #endif
2123 unsigned long invalidate_mapping_pages( struct address_space *mapping,
2124 pgoff_t start, pgoff_t end);
2125
2126 static inline void invalidate_remote_inode( struct inode *inode)
2127 {
2128 if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
2129 S_ISLNK(inode->i_mode))
2130 invalidate_mapping_pages(inode->i_mapping, 0, - 1);
2131 }
2132 extern int invalidate_inode_pages2( struct address_space *mapping);
2133 extern int invalidate_inode_pages2_range( struct address_space *mapping,
2134 pgoff_t start, pgoff_t end);
2135 extern int write_inode_now( struct inode *, int);
2136 extern int filemap_fdatawrite( struct address_space *);
2137 extern int filemap_flush( struct address_space *);
2138 extern int filemap_fdatawait( struct address_space *);
2139 extern int filemap_fdatawait_range( struct address_space *, loff_t lstart,
2140 loff_t lend);
2141 extern int filemap_write_and_wait( struct address_space *mapping);
2142 extern int filemap_write_and_wait_range( struct address_space *mapping,
2143 loff_t lstart, loff_t lend);
2144 extern int __filemap_fdatawrite_range( struct address_space *mapping,
2145 loff_t start, loff_t end, int sync_mode);
2146 extern int filemap_fdatawrite_range( struct address_space *mapping,
2147 loff_t start, loff_t end);
2148
2149 extern int vfs_fsync_range( struct file *file, loff_t start, loff_t end,
2150 int datasync);
2151 extern int vfs_fsync( struct file *file, int datasync);
2152 extern int generic_write_sync( struct file *file, loff_t pos, loff_t count);
2153 extern void sync_supers( void);
2154 extern void emergency_sync( void);
2155 extern void emergency_remount( void);
2156 #ifdef CONFIG_BLOCK
2157 extern sector_t bmap( struct inode *, sector_t);
2158 #endif
2159 extern int notify_change( struct dentry *, struct iattr *);
2160 extern int inode_permission( struct inode *, int);
2161 extern int generic_permission( struct inode *, int,
2162 int (*check_acl)( struct inode *, int));
2163
2164 static inline bool execute_ok( struct inode *inode)
2165 {
2166 return (inode->i_mode & S_IXUGO) || S_ISDIR(inode->i_mode);
2167 }
2168
2169 extern int get_write_access( struct inode *);
2170 extern int deny_write_access( struct file *);
2171 static inline void put_write_access( struct inode * inode)
2172 {
2173 atomic_dec(&inode->i_writecount);
2174 }
2175 static inline void allow_write_access( struct file *file)
2176 {
2177 if (file)
2178 atomic_inc(&file->f_path.dentry->d_inode->i_writecount);
2179 }
2180 extern int do_pipe_flags( int *, int);
2181 extern struct file *create_read_pipe( struct file *f, int flags);
2182 extern struct file *create_write_pipe( int flags);
2183 extern void free_write_pipe( struct file *);
2184
2185 extern struct file *do_filp_open( int dfd, const char *pathname,
2186 int open_flag, int mode, int acc_mode);
2187 extern int may_open( struct path *, int, int);
2188
2189 extern int kernel_read( struct file *, loff_t, char *, unsigned long);
2190 extern struct file * open_exec( const char *);
2191
2192 /* fs/dcache.c -- generic fs support functions */
2193 extern int is_subdir( struct dentry *, struct dentry *);
2194 extern int path_is_under( struct path *, struct path *);
2195 extern ino_t find_inode_number( struct dentry *, struct qstr *);
2196
2197 #include <linux/err.h>
2198
2199 /* needed for stackable file system support */
2200 extern loff_t default_llseek( struct file *file, loff_t offset, int origin);
2201
2202 extern loff_t vfs_llseek( struct file *file, loff_t offset, int origin);
2203
2204 extern int inode_init_always( struct super_block *, struct inode *);
2205 extern void inode_init_once( struct inode *);
2206 extern void ihold( struct inode * inode);
2207 extern void iput( struct inode *);
2208 extern struct inode * igrab( struct inode *);
2209 extern ino_t iunique( struct super_block *, ino_t);
2210 extern int inode_needs_sync( struct inode *inode);
2211 extern int generic_delete_inode( struct inode *inode);
2212 extern int generic_drop_inode( struct inode *inode);
2213
2214 extern struct inode *ilookup5_nowait( struct super_block *sb,
2215 unsigned long hashval, int (*test)( struct inode *, void *),
2216 void *data);
2217 extern struct inode *ilookup5( struct super_block *sb, unsigned long hashval,
2218 int (*test)( struct inode *, void *), void *data);
2219 extern struct inode *ilookup( struct super_block *sb, unsigned long ino);
2220
2221 extern struct inode * iget5_locked( struct super_block *, unsigned long, int (*test)( struct inode *, void *), int (*set)( struct inode *, void *), void *);
2222 extern struct inode * iget_locked( struct super_block *, unsigned long);
2223 extern int insert_inode_locked4( struct inode *, unsigned long, int (*test)( struct inode *, void *), void *);
2224 extern int insert_inode_locked( struct inode *);
2225 extern void unlock_new_inode( struct inode *);
2226 extern unsigned int get_next_ino( void);
2227
2228 extern void __iget( struct inode * inode);
2229 extern void iget_failed( struct inode *);
2230 extern void end_writeback( struct inode *);
2231 extern void __destroy_inode( struct inode *);
2232 extern struct inode *new_inode( struct super_block *);
2233 extern int should_remove_suid( struct dentry *);
2234 extern int file_remove_suid( struct file *);
2235
2236 extern void __insert_inode_hash( struct inode *, unsigned long hashval);
2237 extern void remove_inode_hash( struct inode *);
2238 static inline void insert_inode_hash( struct inode *inode)
2239 {
2240 __insert_inode_hash(inode, inode->i_ino);
2241 }
2242 extern void inode_sb_list_add( struct inode *inode);
2243
2244 #ifdef CONFIG_BLOCK
2245 extern void submit_bio( int, struct bio *);
2246 extern int bdev_read_only( struct block_device *);
2247 #endif
2248 extern int set_blocksize( struct block_device *, int);
2249 extern int sb_set_blocksize( struct super_block *, int);
2250 extern int sb_min_blocksize( struct super_block *, int);
2251
2252 extern int generic_file_mmap( struct file *, struct vm_area_struct *);
2253 extern int generic_file_readonly_mmap( struct file *, struct vm_area_struct *);
2254 extern int file_read_actor(read_descriptor_t * desc, struct page *page, unsigned long offset, unsigned long size);
2255 int generic_write_checks( struct file *file, loff_t *pos, size_t *count, int isblk);
2256 extern ssize_t generic_file_aio_read( struct kiocb *, const struct iovec *, unsigned long, loff_t);
2257 extern ssize_t __generic_file_aio_write( struct kiocb *, const struct iovec *, unsigned long,
2258 loff_t *);
2259 extern ssize_t generic_file_aio_write( struct kiocb *, const struct iovec *, unsigned long, loff_t);
2260 extern ssize_t generic_file_direct_write( struct kiocb *, const struct iovec *,
2261 unsigned long *, loff_t, loff_t *, size_t, size_t);
2262 extern ssize_t generic_file_buffered_write( struct kiocb *, const struct iovec *,
2263 unsigned long, loff_t, loff_t *, size_t, ssize_t);
2264 extern ssize_t do_sync_read( struct file *filp, char __user *buf, size_t len, loff_t *ppos);
2265 extern ssize_t do_sync_write( struct file *filp, const char __user *buf, size_t len, loff_t *ppos);
2266 extern int generic_segment_checks( const struct iovec *iov,
2267 unsigned long *nr_segs, size_t *count, int access_flags);
2268
2269 /* fs/block_dev.c */
2270 extern ssize_t blkdev_aio_write( struct kiocb *iocb, const struct iovec *iov,
2271 unsigned long nr_segs, loff_t pos);
2272 extern int blkdev_fsync( struct file *filp, int datasync);
2273
2274 /* fs/splice.c */
2275 extern ssize_t generic_file_splice_read( struct file *, loff_t *,
2276 struct pipe_inode_info *, size_t, unsigned int);
2277 extern ssize_t default_file_splice_read( struct file *, loff_t *,
2278 struct pipe_inode_info *, size_t, unsigned int);
2279 extern ssize_t generic_file_splice_write( struct pipe_inode_info *,
2280 struct file *, loff_t *, size_t, unsigned int);
2281 extern ssize_t generic_splice_sendpage( struct pipe_inode_info *pipe,
2282 struct file *out, loff_t *, size_t len, unsigned int flags);
2283 extern long do_splice_direct( struct file *in, loff_t *ppos, struct file *out,
2284 size_t len, unsigned int flags);
2285
2286 extern void
2287 file_ra_state_init( struct file_ra_state *ra, struct address_space *mapping);
2288 extern loff_t noop_llseek( struct file *file, loff_t offset, int origin);
2289 extern loff_t no_llseek( struct file *file, loff_t offset, int origin);
2290 extern loff_t generic_file_llseek( struct file *file, loff_t offset, int origin);
2291 extern loff_t generic_file_llseek_unlocked( struct file *file, loff_t offset,
2292 int origin);
2293 extern int generic_file_open( struct inode * inode, struct file * filp);
2294 extern int nonseekable_open( struct inode * inode, struct file * filp);
2295
2296 #ifdef CONFIG_FS_XIP
2297 extern ssize_t xip_file_read( struct file *filp, char __user *buf, size_t len,
2298 loff_t *ppos);
2299 extern int xip_file_mmap( struct file * file, struct vm_area_struct * vma);
2300 extern ssize_t xip_file_write( struct file *filp, const char __user *buf,
2301 size_t len, loff_t *ppos);
2302 extern int xip_truncate_page( struct address_space *mapping, loff_t from);
2303 #else
2304 static inline int xip_truncate_page( struct address_space *mapping, loff_t from)
2305 {
2306 return 0;
2307 }
2308 #endif
2309
2310 #ifdef CONFIG_BLOCK
2311 typedef void (dio_submit_t)( int rw, struct bio *bio, struct inode *inode,
2312 loff_t file_offset);
2313
2314 enum {
2315 /* need locking between buffered and direct access */
2316 DIO_LOCKING = 0x01,
2317
2318 /* filesystem does not support filling holes */
2319 DIO_SKIP_HOLES = 0x02,
2320 };
2321
2322 void dio_end_io( struct bio *bio, int error);
2323
2324 ssize_t __blockdev_direct_IO( int rw, struct kiocb *iocb, struct inode *inode,
2325 struct block_device *bdev, const struct iovec *iov, loff_t offset,
2326 unsigned long nr_segs, get_block_t get_block, dio_iodone_t end_io,
2327 dio_submit_t submit_io, int flags);
2328
2329 static inline ssize_t blockdev_direct_IO( int rw, struct kiocb *iocb,
2330 struct inode *inode, struct block_device *bdev, const struct iovec *iov,
2331 loff_t offset, unsigned long nr_segs, get_block_t get_block,
2332 dio_iodone_t end_io)
2333 {
2334 return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset,
2335 nr_segs, get_block, end_io, NULL,
2336 DIO_LOCKING | DIO_SKIP_HOLES);
2337 }
2338 #endif
2339
2340 extern const struct file_operations generic_ro_fops;
2341
2342 #define special_file(m) (S_ISCHR(m)||S_ISBLK(m)||S_ISFIFO(m)||S_ISSOCK(m))
2343
2344 extern int vfs_readlink( struct dentry *, char __user *, int, const char *);
2345 extern int vfs_follow_link( struct nameidata *, const char *);
2346 extern int page_readlink( struct dentry *, char __user *, int);
2347 extern void *page_follow_link_light( struct dentry *, struct nameidata *);
2348 extern void page_put_link( struct dentry *, struct nameidata *, void *);
2349 extern int __page_symlink( struct inode *inode, const char *symname, int len,
2350 int nofs);
2351 extern int page_symlink( struct inode *inode, const char *symname, int len);
2352 extern const struct inode_operations page_symlink_inode_operations;
2353 extern int generic_readlink( struct dentry *, char __user *, int);
2354 extern void generic_fillattr( struct inode *, struct kstat *);
2355 extern int vfs_getattr( struct vfsmount *, struct dentry *, struct kstat *);
2356 void __inode_add_bytes( struct inode *inode, loff_t bytes);
2357 void inode_add_bytes( struct inode *inode, loff_t bytes);
2358 void inode_sub_bytes( struct inode *inode, loff_t bytes);
2359 loff_t inode_get_bytes( struct inode *inode);
2360 void inode_set_bytes( struct inode *inode, loff_t bytes);
2361
2362 extern int vfs_readdir( struct file *, filldir_t, void *);
2363
2364 extern int vfs_stat( const char __user *, struct kstat *);
2365 extern int vfs_lstat( const char __user *, struct kstat *);
2366 extern int vfs_fstat( unsigned int, struct kstat *);
2367 extern int vfs_fstatat( int , const char __user *, struct kstat *, int);
2368
2369 extern int do_vfs_ioctl( struct file *filp, unsigned int fd, unsigned int cmd,
2370 unsigned long arg);
2371 extern int __generic_block_fiemap( struct inode *inode,
2372 struct fiemap_extent_info *fieinfo,
2373 loff_t start, loff_t len,
2374 get_block_t *get_block);
2375 extern int generic_block_fiemap( struct inode *inode,
2376 struct fiemap_extent_info *fieinfo, u64 start,
2377 u64 len, get_block_t *get_block);
2378
2379 extern void get_filesystem( struct file_system_type *fs);
2380 extern void put_filesystem( struct file_system_type *fs);
2381 extern struct file_system_type *get_fs_type( const char *name);
2382 extern struct super_block *get_super( struct block_device *);
2383 extern struct super_block *get_active_super( struct block_device *bdev);
2384 extern struct super_block *user_get_super(dev_t);
2385 extern void drop_super( struct super_block *sb);
2386 extern void iterate_supers( void (*)( struct super_block *, void *), void *);
2387
2388 extern int dcache_dir_open( struct inode *, struct file *);
2389 extern int dcache_dir_close( struct inode *, struct file *);
2390 extern loff_t dcache_dir_lseek( struct file *, loff_t, int);
2391 extern int dcache_readdir( struct file *, void *, filldir_t);
2392 extern int simple_setattr( struct dentry *, struct iattr *);
2393 extern int simple_getattr( struct vfsmount *, struct dentry *, struct kstat *);
2394 extern int simple_statfs( struct dentry *, struct kstatfs *);
2395 extern int simple_link( struct dentry *, struct inode *, struct dentry *);
2396 extern int simple_unlink( struct inode *, struct dentry *);
2397 extern int simple_rmdir( struct inode *, struct dentry *);
2398 extern int simple_rename( struct inode *, struct dentry *, struct inode *, struct dentry *);
2399 extern int noop_fsync( struct file *, int);
2400 extern int simple_empty( struct dentry *);
2401 extern int simple_readpage( struct file *file, struct page *page);
2402 extern int simple_write_begin( struct file *file, struct address_space *mapping,
2403 loff_t pos, unsigned len, unsigned flags,
2404 struct page **pagep, void **fsdata);
2405 extern int simple_write_end( struct file *file, struct address_space *mapping,
2406 loff_t pos, unsigned len, unsigned copied,
2407 struct page *page, void *fsdata);
2408
2409 extern struct dentry *simple_lookup( struct inode *, struct dentry *, struct nameidata *);
2410 extern ssize_t generic_read_dir( struct file *, char __user *, size_t, loff_t *);
2411 extern const struct file_operations simple_dir_operations;
2412 extern const struct inode_operations simple_dir_inode_operations;
2413 struct tree_descr { char *name; const struct file_operations *ops; int mode; };
2414 struct dentry *d_alloc_name( struct dentry *, const char *);
2415 extern int simple_fill_super( struct super_block *, unsigned long, struct tree_descr *);
2416 extern int simple_pin_fs( struct file_system_type *, struct vfsmount **mount, int *count);
2417 extern void simple_release_fs( struct vfsmount **mount, int *count);
2418
2419 extern ssize_t simple_read_from_buffer( void __user *to, size_t count,
2420 loff_t *ppos, const void *from, size_t available);
2421 extern ssize_t simple_write_to_buffer( void *to, size_t available, loff_t *ppos,
2422 const void __user *from, size_t count);
2423
2424 extern int generic_file_fsync( struct file *, int);
2425
2426 extern int generic_check_addressable( unsigned, u64);
2427
2428 #ifdef CONFIG_MIGRATION
2429 extern int buffer_migrate_page( struct address_space *,
2430 struct page *, struct page *);
2431 #else
2432 #define buffer_migrate_page NULL
2433 #endif
2434
2435 extern int inode_change_ok( const struct inode *, struct iattr *);
2436 extern int inode_newsize_ok( const struct inode *, loff_t offset);
2437 extern void setattr_copy( struct inode *inode, const struct iattr *attr);
2438
2439 extern void file_update_time( struct file *file);
2440
2441 extern int generic_show_options( struct seq_file *m, struct vfsmount *mnt);
2442 extern void save_mount_options( struct super_block *sb, char *options);
2443 extern void replace_mount_options( struct super_block *sb, char *options);
2444
2445 static inline ino_t parent_ino( struct dentry *dentry)
2446 {
2447 ino_t res;
2448
2449 spin_lock(&dentry->d_lock);
2450 res = dentry->d_parent->d_inode->i_ino;
2451 spin_unlock(&dentry->d_lock);
2452 return res;
2453 }
2454
2455 /* Transaction based IO helpers */
2456
2457 /*
2458 * An argresp is stored in an allocated page and holds the
2459 * size of the argument or response, along with its content
2460 */
2461 struct simple_transaction_argresp {
2462 ssize_t size;
2463 char data[ 0];
2464 };
2465
2466 #define SIMPLE_TRANSACTION_LIMIT (PAGE_SIZE - sizeof( struct simple_transaction_argresp))
2467
2468 char *simple_transaction_get( struct file *file, const char __user *buf,
2469 size_t size);
2470 ssize_t simple_transaction_read( struct file *file, char __user *buf,
2471 size_t size, loff_t *pos);
2472 int simple_transaction_release( struct inode *inode, struct file *file);
2473
2474 void simple_transaction_set( struct file *file, size_t n);
2475
2476 /*
2477 * simple attribute files
2478 *
2479 * These attributes behave similar to those in sysfs:
2480 *
2481 * Writing to an attribute immediately sets a value, an open file can be
2482 * written to multiple times.
2483 *
2484 * Reading from an attribute creates a buffer from the value that might get
2485 * read with multiple read calls. When the attribute has been read
2486 * completely, no further read calls are possible until the file is opened
2487 * again.
2488 *
2489 * All attributes contain a text representation of a numeric value
2490 * that are accessed with the get() and set() functions.
2491 */
2492 #define DEFINE_SIMPLE_ATTRIBUTE(__fops, __get, __set, __fmt) \
2493 static int __fops ## _open( struct inode *inode, struct file *file) \
2494 { \
2495 __simple_attr_check_format(__fmt, 0ull); \
2496 return simple_attr_open(inode, file, __get, __set, __fmt); \
2497 } \
2498 static const struct file_operations __fops = { \
2499 .owner = THIS_MODULE, \
2500 .open = __fops ## _open, \
2501 .release = simple_attr_release, \
2502 .read = simple_attr_read, \
2503 .write = simple_attr_write, \
2504 .llseek = generic_file_llseek, \
2505 };
2506
2507 static inline void __attribute__((format(printf, 1, 2)))
2508 __simple_attr_check_format( const char *fmt, ...)
2509 {
2510 /* don't do anything, just let the compiler check the arguments; */
2511 }
2512
2513 int simple_attr_open( struct inode *inode, struct file *file,
2514 int (*get)( void *, u64 *), int (*set)( void *, u64),
2515 const char *fmt);
2516 int simple_attr_release( struct inode *inode, struct file *file);
2517 ssize_t simple_attr_read( struct file *file, char __user *buf,
2518 size_t len, loff_t *ppos);
2519 ssize_t simple_attr_write( struct file *file, const char __user *buf,
2520 size_t len, loff_t *ppos);
2521
2522 struct ctl_table;
2523 int proc_nr_files( struct ctl_table *table, int write,
2524 void __user *buffer, size_t *lenp, loff_t *ppos);
2525 int proc_nr_dentry( struct ctl_table *table, int write,
2526 void __user *buffer, size_t *lenp, loff_t *ppos);
2527 int proc_nr_inodes( struct ctl_table *table, int write,
2528 void __user *buffer, size_t *lenp, loff_t *ppos);
2529 int __init get_filesystem_list( char *buf);
2530
2531 #define ACC_MODE(x) ( "\004\002\006\006"[(x)&O_ACCMODE])
2532 #define OPEN_FMODE(flag) ((__force fmode_t)(((flag + 1) & O_ACCMODE) | \
2533 (flag & FMODE_NONOTIFY)))
2534
2535 #endif /* __KERNEL__ */
2536 #endif /* _LINUX_FS_H */
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