Online Linux Driver Verification Service (alpha)

Start Verification Verification History Rules

Rule violation

Driver: tests-model-08_1--test-doubleget.tar.bz2
Kernel: linux-3.0
Verification architecture: x86_64
Rule: Module get/put

Error trace

-entry_point();

{

-__BLAST_initialize_/home/ldv/ldv-new/ldv-tools-inst/tmp/run/work/current--X--tests-model-08_1--test-doubleget.tar.bz2_58--X--defaultlinux-3.0--X--08_1/linux-3.0/csd_deg_dscv/2/dscv_tempdir/dscv/rcv/08_1/main-ldv_main0_sequence_infinite_withcheck_stateful/preprocess/1-cpp/drivers-tests-model-08_1-test-doubleget-doubleget.o.general.i();

{

22 -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;
misc_fops.fallocate = 0;
ldv_module_refcounter = 1;

return 0;

}

128 -ldv_s_misc_fops_file_operations = 0;
LDV_IN_INTERRUPT = 1;

120 ldv_initialize() { /* The function body is undefined. */ };

126 -tmp = my_init();

{

39 -tmp = register_chrdev(10 /* major */, "misc" /* name */, &(misc_fops) /* fops */);

{

2100 tmp = __register_chrdev(major, 0, 256, name, fops) { /* The function body is undefined. */ };

2100 return tmp;

}

39 assert(tmp == 0);

41 __retres2 = 0;

37 return __retres2;

}

126 assert(tmp == 0);

131 tmp___1 = nondet_int() { /* The function body is undefined. */ };

131 assert(tmp___1 != 0);

135 tmp___0 = nondet_int() { /* The function body is undefined. */ };

137 assert(tmp___0 == 0);

140 assert(ldv_s_misc_fops_file_operations == 0);

145 -res_misc_open_0 = misc_open(var_group1 /* inode */, var_group2 /* file */);

{

30 -tmp = ldv_try_module_get_1(&(&(mydev))->mod /* module */);

{

260 -tmp = ldv_try_module_get(module /* module */);

{

202 assert(module != 0);

205 module_get_succeeded = ldv_undefined_int() { /* The function body is undefined. */ };

207 assert(module_get_succeeded == 1);

209 ldv_module_refcounter = ldv_module_refcounter + 1;

211 __retres3 = 1;

197 return __retres3;

}

260 return tmp;

}

30 assert(tmp != 0);

31 -ldv_try_module_get_2(&(&(mydev))->mod /* module */);

{

268 -tmp = ldv_try_module_get(module /* module */);

{

202 assert(module != 0);

205 module_get_succeeded = ldv_undefined_int() { /* The function body is undefined. */ };

207 assert(module_get_succeeded == 1);

209 ldv_module_refcounter = ldv_module_refcounter + 1;

211 __retres3 = 1;

197 return __retres3;

}

268 return tmp;

}

32 -ldv_module_put_3(&(&(mydev))->mod /* ldv_func_arg1 */);

{

276 -ldv_module_put(ldv_func_arg1 /* module */);

{

225 assert(module != 0);

227 assert(ldv_module_refcounter > 1);

229 ldv_module_refcounter = ldv_module_refcounter - 1;

222 return 0;

}

271 return 0;

}

34 __retres4 = 0;

28 return __retres4;

}

146 ldv_check_return_value(res_misc_open_0) { /* The function body is undefined. */ };

147 assert(res_misc_open_0 == 0);

149 ldv_s_misc_fops_file_operations = 0;

131 tmp___1 = nondet_int() { /* The function body is undefined. */ };

131 assert(tmp___1 == 0);

131 assert(ldv_s_misc_fops_file_operations == 0);

168 -my_exit();

{

47 return 0;

}

171 -ldv_check_final_state();

{

252 assert(ldv_module_refcounter != 1);

252 -ldv_blast_assert();

{
}

}

Source code

doubleget.c.p
fs.h

1 2 #include <linux/module.h> 3 extern int ldv_try_module_get(struct module*); 4 extern void ldv_module_get(struct module*); 5 extern void ldv_module_put(struct module*); 6 extern unsigned int ldv_module_refcount(void); 7 extern void ldv_module_put_and_exit(); 8 9 /** 10 */ 11 #include <linux/kernel.h> 12 #include <linux/module.h> 13 #include <linux/major.h> 14 #include <linux/fs.h> 15 16 struct my_device { 17 struct module mod; 18 } mydev; 19 20 static int misc_open(struct inode * inode, struct file * file); 21 22 static const struct file_operations misc_fops = { 23 .owner = THIS_MODULE, 24 .open = misc_open, 25 }; 26 27 28 static int misc_open(struct inode * inode, struct file * file) 29 { 30 if (try_module_get(&mydev.mod)) { 31 try_module_get(&mydev.mod); 32 module_put(&mydev.mod); 33 } 34 return 0; 35 } 36 37 static int __init my_init(void) 38 { 39 if (register_chrdev(MISC_MAJOR,"misc",&misc_fops)) 40 goto fail_register; 41 return 0; 42 43 fail_register: 44 return -1; 45 } 46 47 static void __exit my_exit(void) 48 { 49 } 50 51 module_init(my_init); 52 module_exit(my_exit); 53 54 MODULE_LICENSE("Apache 2.0"); 55 MODULE_AUTHOR("LDV Project, Vadim Mutilin <mutilin@ispras.ru>"); 56 57 58 59 60 61 62 /* LDV_COMMENT_BEGIN_MAIN */ 63 #ifdef LDV_MAIN0_sequence_infinite_withcheck_stateful 64 65 /*###########################################################################*/ 66 67 /*############## Driver Environment Generator 0.2 output ####################*/ 68 69 /*###########################################################################*/ 70 71 72 73 /* 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. */ 74 void ldv_check_final_state(void); 75 76 /* LDV_COMMENT_FUNCTION_DECLARE_LDV Special function for LDV verifier. Test correct return result. */ 77 void ldv_check_return_value(int res); 78 79 /* LDV_COMMENT_FUNCTION_DECLARE_LDV Special function for LDV verifier. Initializes the model. */ 80 void ldv_initialize(void); 81 82 /* LDV_COMMENT_FUNCTION_DECLARE_LDV Special function for LDV verifier. Returns arbitrary interger value. */ 83 int nondet_int(void); 84 85 /* LDV_COMMENT_VAR_DECLARE_LDV Special variable for LDV verifier. */ 86 int LDV_IN_INTERRUPT; 87 88 /* LDV_COMMENT_FUNCTION_MAIN Main function for LDV verifier. */ 89 void ldv_main0_sequence_infinite_withcheck_stateful(void) { 90 91 92 93 /* LDV_COMMENT_BEGIN_VARIABLE_DECLARATION_PART */ 94 /*============================= VARIABLE DECLARATION PART =============================*/ 95 /** STRUCT: struct type: file_operations, struct name: misc_fops **/ 96 /* content: static int misc_open(struct inode * inode, struct file * file)*/ 97 /* LDV_COMMENT_END_PREP */ 98 /* LDV_COMMENT_VAR_DECLARE Variable declaration for function "misc_open" */ 99 struct inode * var_group1; 100 /* LDV_COMMENT_VAR_DECLARE Variable declaration for function "misc_open" */ 101 struct file * var_group2; 102 /* LDV_COMMENT_VAR_DECLARE Variable declaration for test return result from function call "misc_open" */ 103 static int res_misc_open_0; 104 105 106 107 108 /* LDV_COMMENT_END_VARIABLE_DECLARATION_PART */ 109 /* LDV_COMMENT_BEGIN_VARIABLE_INITIALIZING_PART */ 110 /*============================= VARIABLE INITIALIZING PART =============================*/ 111 LDV_IN_INTERRUPT=1; 112 113 114 115 116 /* LDV_COMMENT_END_VARIABLE_INITIALIZING_PART */ 117 /* LDV_COMMENT_BEGIN_FUNCTION_CALL_SECTION */ 118 /*============================= FUNCTION CALL SECTION =============================*/ 119 /* LDV_COMMENT_FUNCTION_CALL Initialize LDV model. */ 120 ldv_initialize(); 121 122 /** INIT: init_type: ST_MODULE_INIT **/ 123 /* content: static int __init my_init(void)*/ 124 /* LDV_COMMENT_END_PREP */ 125 /* LDV_COMMENT_FUNCTION_CALL Kernel calls driver init function after driver loading to kernel. This function declared as "MODULE_INIT(function name)". */ 126 if(my_init()) 127 goto ldv_final; 128 int ldv_s_misc_fops_file_operations = 0; 129 130 131 while( nondet_int() 132 || !(ldv_s_misc_fops_file_operations == 0) 133 ) { 134 135 switch(nondet_int()) { 136 137 case 0: { 138 139 /** STRUCT: struct type: file_operations, struct name: misc_fops **/ 140 if(ldv_s_misc_fops_file_operations==0) { 141 142 /* content: static int misc_open(struct inode * inode, struct file * file)*/ 143 /* LDV_COMMENT_END_PREP */ 144 /* LDV_COMMENT_FUNCTION_CALL Function from field "open" from driver structure with callbacks "misc_fops". Standart function test for correct return result. */ 145 res_misc_open_0 = misc_open( var_group1, var_group2); 146 ldv_check_return_value(res_misc_open_0); 147 if(res_misc_open_0) 148 goto ldv_module_exit; 149 ldv_s_misc_fops_file_operations=0; 150 151 } 152 153 } 154 155 break; 156 default: break; 157 158 } 159 160 } 161 162 ldv_module_exit: 163 164 /** INIT: init_type: ST_MODULE_EXIT **/ 165 /* content: static void __exit my_exit(void)*/ 166 /* LDV_COMMENT_END_PREP */ 167 /* LDV_COMMENT_FUNCTION_CALL Kernel calls driver release function before driver will be uploaded from kernel. This function declared as "MODULE_EXIT(function name)". */ 168 my_exit(); 169 170 /* LDV_COMMENT_FUNCTION_CALL Checks that all resources and locks are correctly released before the driver will be unloaded. */ 171 ldv_final: ldv_check_final_state(); 172 173 /* LDV_COMMENT_END_FUNCTION_CALL_SECTION */ 174 return; 175 176 } 177 #endif 178 179 /* LDV_COMMENT_END_MAIN */ 180 181 #include "engine-blast.h" 182 183 /* Module locks counter (1 is the initial state; it shouldn't go lower). We do not distinguish different modules. */ 184 int ldv_module_refcounter = 1; 185 186 /* LDV_COMMENT_MODEL_FUNCTION_DEFINITION(name='ldv_module_get') Increment module reference counter (unless the module pointer is NULL). */ 187 void ldv_module_get(struct module *module) 188 { 189 /* LDV_COMMENT_OTHER Do nothing if the module pointer is NULL */ 190 if (module){ 191 /* LDV_COMMENT_CHANGE_STATE Increment module reference counter. */ 192 ldv_module_refcounter++; 193 } 194 } 195 196 /* LDV_COMMENT_MODEL_FUNCTION_DEFINITION(name='ldv_try_module_get') Try to get module. The operation may succeed and return 1, or fail and return 0. */ 197 int ldv_try_module_get(struct module *module) 198 { 199 int module_get_succeeded; 200 201 /* LDV_COMMENT_OTHER Do nothing if the module pointer is NULL */ 202 if (module){ 203 204 /* LDV_COMMENT_OTHER Model success or failure of getting the module. */ 205 module_get_succeeded = ldv_undef_int(); 206 207 if (module_get_succeeded == 1) { 208 /* LDV_COMMENT_CHANGE_STATE Increment module reference counter. */ 209 ldv_module_refcounter++; 210 /* LDV_COMMENT_RETURN Return 1 telling about success. */ 211 return 1; 212 } 213 else 214 { 215 /* LDV_COMMENT_RETURN Return 0 telling that module get has failed.. */ 216 return 0; 217 } 218 } 219 } 220 221 /* LDV_COMMENT_MODEL_FUNCTION_DEFINITION(name='ldv_module_put') Put module (unless module pointer is zero). Check if the module reference counter was greater than zero. */ 222 void ldv_module_put(struct module *module) 223 { 224 /* LDV_COMMENT_OTHER Do nothing if the module pointer is NULL */ 225 if (module){ 226 /* LDV_COMMENT_ASSERT This assertion fails if the module was put more times than it was got */ 227 ldv_assert(ldv_module_refcounter > 1); 228 /* LDV_COMMENT_CHANGE_STATE Decrease reference counter thus putting the module. */ 229 ldv_module_refcounter--; 230 } 231 } 232 233 /* LDV_COMMENT_MODEL_FUNCTION_DEFINITION(name='ldv_module_put_and_exit') Put the module and stop execution. */ 234 void ldv_module_put_and_exit() 235 { 236 ldv_module_put((struct module*)1); 237 /* LDV_COMMENT_OTHER Stop execution. */ 238 LDV_STOP: goto LDV_STOP; 239 } 240 241 /* LDV_COMMENT_MODEL_FUNCTION_DEFINITION(name='ldv_module_refcount') Get the reference counter of the module. */ 242 unsigned int ldv_module_refcount(void) 243 { 244 /* LDV_COMMENT_RETURN Return reference counter */ 245 return ldv_module_refcounter - 1; 246 } 247 248 /* LDV_COMMENT_MODEL_FUNCTION_DEFINITION(name='check_final_state') At the end of execution, module reference counter must be the same as at the beginning. */ 249 void ldv_check_final_state(void) 250 { 251 /* LDV_COMMENT_ASSERT If this assertion is violated, then the module was put somewhere duiring the execution, and wasn't got! */ 252 ldv_assert(ldv_module_refcounter == 1); 253 }

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_CUR 1024 /* Initial setting for nfile rlimits */ 27 #define INR_OPEN_MAX 4096 /* Hard limit for nfile rlimits */ 28 29 #define BLOCK_SIZE_BITS 10 30 #define BLOCK_SIZE (1<<BLOCK_SIZE_BITS) 31 32 #define SEEK_SET 0 /* seek relative to beginning of file */ 33 #define SEEK_CUR 1 /* seek relative to current file position */ 34 #define SEEK_END 2 /* seek relative to end of file */ 35 #define SEEK_MAX SEEK_END 36 37 struct fstrim_range { 38 __u64 start; 39 __u64 len; 40 __u64 minlen; 41 }; 42 43 /* And dynamically-tunable limits and defaults: */ 44 struct files_stat_struct { 45 unsigned long nr_files; /* read only */ 46 unsigned long nr_free_files; /* read only */ 47 unsigned long max_files; /* tunable */ 48 }; 49 50 struct inodes_stat_t { 51 int nr_inodes; 52 int nr_unused; 53 int dummy[5]; /* padding for sysctl ABI compatibility */ 54 }; 55 56 57 #define NR_FILE 8192 /* this can well be larger on a larger system */ 58 59 #define MAY_EXEC 1 60 #define MAY_WRITE 2 61 #define MAY_READ 4 62 #define MAY_APPEND 8 63 #define MAY_ACCESS 16 64 #define MAY_OPEN 32 65 #define MAY_CHDIR 64 66 67 /* 68 * flags in file.f_mode. Note that FMODE_READ and FMODE_WRITE must correspond 69 * to O_WRONLY and O_RDWR via the strange trick in __dentry_open() 70 */ 71 72 /* file is open for reading */ 73 #define FMODE_READ ((__force fmode_t)0x1) 74 /* file is open for writing */ 75 #define FMODE_WRITE ((__force fmode_t)0x2) 76 /* file is seekable */ 77 #define FMODE_LSEEK ((__force fmode_t)0x4) 78 /* file can be accessed using pread */ 79 #define FMODE_PREAD ((__force fmode_t)0x8) 80 /* file can be accessed using pwrite */ 81 #define FMODE_PWRITE ((__force fmode_t)0x10) 82 /* File is opened for execution with sys_execve / sys_uselib */ 83 #define FMODE_EXEC ((__force fmode_t)0x20) 84 /* File is opened with O_NDELAY (only set for block devices) */ 85 #define FMODE_NDELAY ((__force fmode_t)0x40) 86 /* File is opened with O_EXCL (only set for block devices) */ 87 #define FMODE_EXCL ((__force fmode_t)0x80) 88 /* File is opened using open(.., 3, ..) and is writeable only for ioctls 89 (specialy hack for floppy.c) */ 90 #define FMODE_WRITE_IOCTL ((__force fmode_t)0x100) 91 92 /* 93 * Don't update ctime and mtime. 94 * 95 * Currently a special hack for the XFS open_by_handle ioctl, but we'll 96 * hopefully graduate it to a proper O_CMTIME flag supported by open(2) soon. 97 */ 98 #define FMODE_NOCMTIME ((__force fmode_t)0x800) 99 100 /* Expect random access pattern */ 101 #define FMODE_RANDOM ((__force fmode_t)0x1000) 102 103 /* File is huge (eg. /dev/kmem): treat loff_t as unsigned */ 104 #define FMODE_UNSIGNED_OFFSET ((__force fmode_t)0x2000) 105 106 /* File is opened with O_PATH; almost nothing can be done with it */ 107 #define FMODE_PATH ((__force fmode_t)0x4000) 108 109 /* File was opened by fanotify and shouldn't generate fanotify events */ 110 #define FMODE_NONOTIFY ((__force fmode_t)0x1000000) 111 112 /* 113 * The below are the various read and write types that we support. Some of 114 * them include behavioral modifiers that send information down to the 115 * block layer and IO scheduler. Terminology: 116 * 117 * The block layer uses device plugging to defer IO a little bit, in 118 * the hope that we will see more IO very shortly. This increases 119 * coalescing of adjacent IO and thus reduces the number of IOs we 120 * have to send to the device. It also allows for better queuing, 121 * if the IO isn't mergeable. If the caller is going to be waiting 122 * for the IO, then he must ensure that the device is unplugged so 123 * that the IO is dispatched to the driver. 124 * 125 * All IO is handled async in Linux. This is fine for background 126 * writes, but for reads or writes that someone waits for completion 127 * on, we want to notify the block layer and IO scheduler so that they 128 * know about it. That allows them to make better scheduling 129 * decisions. So when the below references 'sync' and 'async', it 130 * is referencing this priority hint. 131 * 132 * With that in mind, the available types are: 133 * 134 * READ A normal read operation. Device will be plugged. 135 * READ_SYNC A synchronous read. Device is not plugged, caller can 136 * immediately wait on this read without caring about 137 * unplugging. 138 * READA Used for read-ahead operations. Lower priority, and the 139 * block layer could (in theory) choose to ignore this 140 * request if it runs into resource problems. 141 * WRITE A normal async write. Device will be plugged. 142 * WRITE_SYNC Synchronous write. Identical to WRITE, but passes down 143 * the hint that someone will be waiting on this IO 144 * shortly. The write equivalent of READ_SYNC. 145 * WRITE_ODIRECT Special case write for O_DIRECT only. 146 * WRITE_FLUSH Like WRITE_SYNC but with preceding cache flush. 147 * WRITE_FUA Like WRITE_SYNC but data is guaranteed to be on 148 * non-volatile media on completion. 149 * WRITE_FLUSH_FUA Combination of WRITE_FLUSH and FUA. The IO is preceded 150 * by a cache flush and data is guaranteed to be on 151 * non-volatile media on completion. 152 * 153 */ 154 #define RW_MASK REQ_WRITE 155 #define RWA_MASK REQ_RAHEAD 156 157 #define READ 0 158 #define WRITE RW_MASK 159 #define READA RWA_MASK 160 161 #define READ_SYNC (READ | REQ_SYNC) 162 #define READ_META (READ | REQ_META) 163 #define WRITE_SYNC (WRITE | REQ_SYNC | REQ_NOIDLE) 164 #define WRITE_ODIRECT (WRITE | REQ_SYNC) 165 #define WRITE_META (WRITE | REQ_META) 166 #define WRITE_FLUSH (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FLUSH) 167 #define WRITE_FUA (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FUA) 168 #define WRITE_FLUSH_FUA (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FLUSH | REQ_FUA) 169 170 #define SEL_IN 1 171 #define SEL_OUT 2 172 #define SEL_EX 4 173 174 /* public flags for file_system_type */ 175 #define FS_REQUIRES_DEV 1 176 #define FS_BINARY_MOUNTDATA 2 177 #define FS_HAS_SUBTYPE 4 178 #define FS_REVAL_DOT 16384 /* Check the paths ".", ".." for staleness */ 179 #define FS_RENAME_DOES_D_MOVE 32768 /* FS will handle d_move() 180 * during rename() internally. 181 */ 182 183 /* 184 * These are the fs-independent mount-flags: up to 32 flags are supported 185 */ 186 #define MS_RDONLY 1 /* Mount read-only */ 187 #define MS_NOSUID 2 /* Ignore suid and sgid bits */ 188 #define MS_NODEV 4 /* Disallow access to device special files */ 189 #define MS_NOEXEC 8 /* Disallow program execution */ 190 #define MS_SYNCHRONOUS 16 /* Writes are synced at once */ 191 #define MS_REMOUNT 32 /* Alter flags of a mounted FS */ 192 #define MS_MANDLOCK 64 /* Allow mandatory locks on an FS */ 193 #define MS_DIRSYNC 128 /* Directory modifications are synchronous */ 194 #define MS_NOATIME 1024 /* Do not update access times. */ 195 #define MS_NODIRATIME 2048 /* Do not update directory access times */ 196 #define MS_BIND 4096 197 #define MS_MOVE 8192 198 #define MS_REC 16384 199 #define MS_VERBOSE 32768 /* War is peace. Verbosity is silence. 200 MS_VERBOSE is deprecated. */ 201 #define MS_SILENT 32768 202 #define MS_POSIXACL (1<<16) /* VFS does not apply the umask */ 203 #define MS_UNBINDABLE (1<<17) /* change to unbindable */ 204 #define MS_PRIVATE (1<<18) /* change to private */ 205 #define MS_SLAVE (1<<19) /* change to slave */ 206 #define MS_SHARED (1<<20) /* change to shared */ 207 #define MS_RELATIME (1<<21) /* Update atime relative to mtime/ctime. */ 208 #define MS_KERNMOUNT (1<<22) /* this is a kern_mount call */ 209 #define MS_I_VERSION (1<<23) /* Update inode I_version field */ 210 #define MS_STRICTATIME (1<<24) /* Always perform atime updates */ 211 #define MS_NOSEC (1<<28) 212 #define MS_BORN (1<<29) 213 #define MS_ACTIVE (1<<30) 214 #define MS_NOUSER (1<<31) 215 216 /* 217 * Superblock flags that can be altered by MS_REMOUNT 218 */ 219 #define MS_RMT_MASK (MS_RDONLY|MS_SYNCHRONOUS|MS_MANDLOCK|MS_I_VERSION) 220 221 /* 222 * Old magic mount flag and mask 223 */ 224 #define MS_MGC_VAL 0xC0ED0000 225 #define MS_MGC_MSK 0xffff0000 226 227 /* Inode flags - they have nothing to superblock flags now */ 228 229 #define S_SYNC 1 /* Writes are synced at once */ 230 #define S_NOATIME 2 /* Do not update access times */ 231 #define S_APPEND 4 /* Append-only file */ 232 #define S_IMMUTABLE 8 /* Immutable file */ 233 #define S_DEAD 16 /* removed, but still open directory */ 234 #define S_NOQUOTA 32 /* Inode is not counted to quota */ 235 #define S_DIRSYNC 64 /* Directory modifications are synchronous */ 236 #define S_NOCMTIME 128 /* Do not update file c/mtime */ 237 #define S_SWAPFILE 256 /* Do not truncate: swapon got its bmaps */ 238 #define S_PRIVATE 512 /* Inode is fs-internal */ 239 #define S_IMA 1024 /* Inode has an associated IMA struct */ 240 #define S_AUTOMOUNT 2048 /* Automount/referral quasi-directory */ 241 #define S_NOSEC 4096 /* no suid or xattr security attributes */ 242 243 /* 244 * Note that nosuid etc flags are inode-specific: setting some file-system 245 * flags just means all the inodes inherit those flags by default. It might be 246 * possible to override it selectively if you really wanted to with some 247 * ioctl() that is not currently implemented. 248 * 249 * Exception: MS_RDONLY is always applied to the entire file system. 250 * 251 * Unfortunately, it is possible to change a filesystems flags with it mounted 252 * with files in use. This means that all of the inodes will not have their 253 * i_flags updated. Hence, i_flags no longer inherit the superblock mount 254 * flags, so these have to be checked separately. -- rmk@arm.uk.linux.org 255 */ 256 #define __IS_FLG(inode,flg) ((inode)->i_sb->s_flags & (flg)) 257 258 #define IS_RDONLY(inode) ((inode)->i_sb->s_flags & MS_RDONLY) 259 #define IS_SYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS) || \ 260 ((inode)->i_flags & S_SYNC)) 261 #define IS_DIRSYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS|MS_DIRSYNC) || \ 262 ((inode)->i_flags & (S_SYNC|S_DIRSYNC))) 263 #define IS_MANDLOCK(inode) __IS_FLG(inode, MS_MANDLOCK) 264 #define IS_NOATIME(inode) __IS_FLG(inode, MS_RDONLY|MS_NOATIME) 265 #define IS_I_VERSION(inode) __IS_FLG(inode, MS_I_VERSION) 266 267 #define IS_NOQUOTA(inode) ((inode)->i_flags & S_NOQUOTA) 268 #define IS_APPEND(inode) ((inode)->i_flags & S_APPEND) 269 #define IS_IMMUTABLE(inode) ((inode)->i_flags & S_IMMUTABLE) 270 #define IS_POSIXACL(inode) __IS_FLG(inode, MS_POSIXACL) 271 272 #define IS_DEADDIR(inode) ((inode)->i_flags & S_DEAD) 273 #define IS_NOCMTIME(inode) ((inode)->i_flags & S_NOCMTIME) 274 #define IS_SWAPFILE(inode) ((inode)->i_flags & S_SWAPFILE) 275 #define IS_PRIVATE(inode) ((inode)->i_flags & S_PRIVATE) 276 #define IS_IMA(inode) ((inode)->i_flags & S_IMA) 277 #define IS_AUTOMOUNT(inode) ((inode)->i_flags & S_AUTOMOUNT) 278 #define IS_NOSEC(inode) ((inode)->i_flags & S_NOSEC) 279 280 /* the read-only stuff doesn't really belong here, but any other place is 281 probably as bad and I don't want to create yet another include file. */ 282 283 #define BLKROSET _IO(0x12,93) /* set device read-only (0 = read-write) */ 284 #define BLKROGET _IO(0x12,94) /* get read-only status (0 = read_write) */ 285 #define BLKRRPART _IO(0x12,95) /* re-read partition table */ 286 #define BLKGETSIZE _IO(0x12,96) /* return device size /512 (long *arg) */ 287 #define BLKFLSBUF _IO(0x12,97) /* flush buffer cache */ 288 #define BLKRASET _IO(0x12,98) /* set read ahead for block device */ 289 #define BLKRAGET _IO(0x12,99) /* get current read ahead setting */ 290 #define BLKFRASET _IO(0x12,100)/* set filesystem (mm/filemap.c) read-ahead */ 291 #define BLKFRAGET _IO(0x12,101)/* get filesystem (mm/filemap.c) read-ahead */ 292 #define BLKSECTSET _IO(0x12,102)/* set max sectors per request (ll_rw_blk.c) */ 293 #define BLKSECTGET _IO(0x12,103)/* get max sectors per request (ll_rw_blk.c) */ 294 #define BLKSSZGET _IO(0x12,104)/* get block device sector size */ 295 #if 0 296 #define BLKPG _IO(0x12,105)/* See blkpg.h */ 297 298 /* Some people are morons. Do not use sizeof! */ 299 300 #define BLKELVGET _IOR(0x12,106,size_t)/* elevator get */ 301 #define BLKELVSET _IOW(0x12,107,size_t)/* elevator set */ 302 /* This was here just to show that the number is taken - 303 probably all these _IO(0x12,*) ioctls should be moved to blkpg.h. */ 304 #endif 305 /* A jump here: 108-111 have been used for various private purposes. */ 306 #define BLKBSZGET _IOR(0x12,112,size_t) 307 #define BLKBSZSET _IOW(0x12,113,size_t) 308 #define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */ 309 #define BLKTRACESETUP _IOWR(0x12,115,struct blk_user_trace_setup) 310 #define BLKTRACESTART _IO(0x12,116) 311 #define BLKTRACESTOP _IO(0x12,117) 312 #define BLKTRACETEARDOWN _IO(0x12,118) 313 #define BLKDISCARD _IO(0x12,119) 314 #define BLKIOMIN _IO(0x12,120) 315 #define BLKIOOPT _IO(0x12,121) 316 #define BLKALIGNOFF _IO(0x12,122) 317 #define BLKPBSZGET _IO(0x12,123) 318 #define BLKDISCARDZEROES _IO(0x12,124) 319 #define BLKSECDISCARD _IO(0x12,125) 320 321 #define BMAP_IOCTL 1 /* obsolete - kept for compatibility */ 322 #define FIBMAP _IO(0x00,1) /* bmap access */ 323 #define FIGETBSZ _IO(0x00,2) /* get the block size used for bmap */ 324 #define FIFREEZE _IOWR('X', 119, int) /* Freeze */ 325 #define FITHAW _IOWR('X', 120, int) /* Thaw */ 326 #define FITRIM _IOWR('X', 121, struct fstrim_range) /* Trim */ 327 328 #define FS_IOC_GETFLAGS _IOR('f', 1, long) 329 #define FS_IOC_SETFLAGS _IOW('f', 2, long) 330 #define FS_IOC_GETVERSION _IOR('v', 1, long) 331 #define FS_IOC_SETVERSION _IOW('v', 2, long) 332 #define FS_IOC_FIEMAP _IOWR('f', 11, struct fiemap) 333 #define FS_IOC32_GETFLAGS _IOR('f', 1, int) 334 #define FS_IOC32_SETFLAGS _IOW('f', 2, int) 335 #define FS_IOC32_GETVERSION _IOR('v', 1, int) 336 #define FS_IOC32_SETVERSION _IOW('v', 2, int) 337 338 /* 339 * Inode flags (FS_IOC_GETFLAGS / FS_IOC_SETFLAGS) 340 */ 341 #define FS_SECRM_FL 0x00000001 /* Secure deletion */ 342 #define FS_UNRM_FL 0x00000002 /* Undelete */ 343 #define FS_COMPR_FL 0x00000004 /* Compress file */ 344 #define FS_SYNC_FL 0x00000008 /* Synchronous updates */ 345 #define FS_IMMUTABLE_FL 0x00000010 /* Immutable file */ 346 #define FS_APPEND_FL 0x00000020 /* writes to file may only append */ 347 #define FS_NODUMP_FL 0x00000040 /* do not dump file */ 348 #define FS_NOATIME_FL 0x00000080 /* do not update atime */ 349 /* Reserved for compression usage... */ 350 #define FS_DIRTY_FL 0x00000100 351 #define FS_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 352 #define FS_NOCOMP_FL 0x00000400 /* Don't compress */ 353 #define FS_ECOMPR_FL 0x00000800 /* Compression error */ 354 /* End compression flags --- maybe not all used */ 355 #define FS_BTREE_FL 0x00001000 /* btree format dir */ 356 #define FS_INDEX_FL 0x00001000 /* hash-indexed directory */ 357 #define FS_IMAGIC_FL 0x00002000 /* AFS directory */ 358 #define FS_JOURNAL_DATA_FL 0x00004000 /* Reserved for ext3 */ 359 #define FS_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 360 #define FS_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ 361 #define FS_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 362 #define FS_EXTENT_FL 0x00080000 /* Extents */ 363 #define FS_DIRECTIO_FL 0x00100000 /* Use direct i/o */ 364 #define FS_NOCOW_FL 0x00800000 /* Do not cow file */ 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/list.h> 386 #include <linux/radix-tree.h> 387 #include <linux/prio_tree.h> 388 #include <linux/init.h> 389 #include <linux/pid.h> 390 #include <linux/mutex.h> 391 #include <linux/capability.h> 392 #include <linux/semaphore.h> 393 #include <linux/fiemap.h> 394 #include <linux/rculist_bl.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 kobject; 405 struct pipe_inode_info; 406 struct poll_table_struct; 407 struct kstatfs; 408 struct vm_area_struct; 409 struct vfsmount; 410 struct cred; 411 412 extern void __init inode_init(void); 413 extern void __init inode_init_early(void); 414 extern void __init files_init(unsigned long); 415 416 extern struct files_stat_struct files_stat; 417 extern unsigned long get_max_files(void); 418 extern int sysctl_nr_open; 419 extern struct inodes_stat_t inodes_stat; 420 extern int leases_enable, lease_break_time; 421 422 struct buffer_head; 423 typedef int (get_block_t)(struct inode *inode, sector_t iblock, 424 struct buffer_head *bh_result, int create); 425 typedef void (dio_iodone_t)(struct kiocb *iocb, loff_t offset, 426 ssize_t bytes, void *private, int ret, 427 bool is_async); 428 429 /* 430 * Attribute flags. These should be or-ed together to figure out what 431 * has been changed! 432 */ 433 #define ATTR_MODE (1 << 0) 434 #define ATTR_UID (1 << 1) 435 #define ATTR_GID (1 << 2) 436 #define ATTR_SIZE (1 << 3) 437 #define ATTR_ATIME (1 << 4) 438 #define ATTR_MTIME (1 << 5) 439 #define ATTR_CTIME (1 << 6) 440 #define ATTR_ATIME_SET (1 << 7) 441 #define ATTR_MTIME_SET (1 << 8) 442 #define ATTR_FORCE (1 << 9) /* Not a change, but a change it */ 443 #define ATTR_ATTR_FLAG (1 << 10) 444 #define ATTR_KILL_SUID (1 << 11) 445 #define ATTR_KILL_SGID (1 << 12) 446 #define ATTR_FILE (1 << 13) 447 #define ATTR_KILL_PRIV (1 << 14) 448 #define ATTR_OPEN (1 << 15) /* Truncating from open(O_TRUNC) */ 449 #define ATTR_TIMES_SET (1 << 16) 450 451 /* 452 * This is the Inode Attributes structure, used for notify_change(). It 453 * uses the above definitions as flags, to know which values have changed. 454 * Also, in this manner, a Filesystem can look at only the values it cares 455 * about. Basically, these are the attributes that the VFS layer can 456 * request to change from the FS layer. 457 * 458 * Derek Atkins <warlord@MIT.EDU> 94-10-20 459 */ 460 struct iattr { 461 unsigned int ia_valid; 462 umode_t ia_mode; 463 uid_t ia_uid; 464 gid_t ia_gid; 465 loff_t ia_size; 466 struct timespec ia_atime; 467 struct timespec ia_mtime; 468 struct timespec ia_ctime; 469 470 /* 471 * Not an attribute, but an auxiliary info for filesystems wanting to 472 * implement an ftruncate() like method. NOTE: filesystem should 473 * check for (ia_valid & ATTR_FILE), and not for (ia_file != NULL). 474 */ 475 struct file *ia_file; 476 }; 477 478 /* 479 * Includes for diskquotas. 480 */ 481 #include <linux/quota.h> 482 483 /** 484 * enum positive_aop_returns - aop return codes with specific semantics 485 * 486 * @AOP_WRITEPAGE_ACTIVATE: Informs the caller that page writeback has 487 * completed, that the page is still locked, and 488 * should be considered active. The VM uses this hint 489 * to return the page to the active list -- it won't 490 * be a candidate for writeback again in the near 491 * future. Other callers must be careful to unlock 492 * the page if they get this return. Returned by 493 * writepage(); 494 * 495 * @AOP_TRUNCATED_PAGE: The AOP method that was handed a locked page has 496 * unlocked it and the page might have been truncated. 497 * The caller should back up to acquiring a new page and 498 * trying again. The aop will be taking reasonable 499 * precautions not to livelock. If the caller held a page 500 * reference, it should drop it before retrying. Returned 501 * by readpage(). 502 * 503 * address_space_operation functions return these large constants to indicate 504 * special semantics to the caller. These are much larger than the bytes in a 505 * page to allow for functions that return the number of bytes operated on in a 506 * given page. 507 */ 508 509 enum positive_aop_returns { 510 AOP_WRITEPAGE_ACTIVATE = 0x80000, 511 AOP_TRUNCATED_PAGE = 0x80001, 512 }; 513 514 #define AOP_FLAG_UNINTERRUPTIBLE 0x0001 /* will not do a short write */ 515 #define AOP_FLAG_CONT_EXPAND 0x0002 /* called from cont_expand */ 516 #define AOP_FLAG_NOFS 0x0004 /* used by filesystem to direct 517 * helper code (eg buffer layer) 518 * to clear GFP_FS from alloc */ 519 520 /* 521 * oh the beauties of C type declarations. 522 */ 523 struct page; 524 struct address_space; 525 struct writeback_control; 526 527 struct iov_iter { 528 const struct iovec *iov; 529 unsigned long nr_segs; 530 size_t iov_offset; 531 size_t count; 532 }; 533 534 size_t iov_iter_copy_from_user_atomic(struct page *page, 535 struct iov_iter *i, unsigned long offset, size_t bytes); 536 size_t iov_iter_copy_from_user(struct page *page, 537 struct iov_iter *i, unsigned long offset, size_t bytes); 538 void iov_iter_advance(struct iov_iter *i, size_t bytes); 539 int iov_iter_fault_in_readable(struct iov_iter *i, size_t bytes); 540 size_t iov_iter_single_seg_count(struct iov_iter *i); 541 542 static inline void iov_iter_init(struct iov_iter *i, 543 const struct iovec *iov, unsigned long nr_segs, 544 size_t count, size_t written) 545 { 546 i->iov = iov; 547 i->nr_segs = nr_segs; 548 i->iov_offset = 0; 549 i->count = count + written; 550 551 iov_iter_advance(i, written); 552 } 553 554 static inline size_t iov_iter_count(struct iov_iter *i) 555 { 556 return i->count; 557 } 558 559 /* 560 * "descriptor" for what we're up to with a read. 561 * This allows us to use the same read code yet 562 * have multiple different users of the data that 563 * we read from a file. 564 * 565 * The simplest case just copies the data to user 566 * mode. 567 */ 568 typedef struct { 569 size_t written; 570 size_t count; 571 union { 572 char __user *buf; 573 void *data; 574 } arg; 575 int error; 576 } read_descriptor_t; 577 578 typedef int (*read_actor_t)(read_descriptor_t *, struct page *, 579 unsigned long, unsigned long); 580 581 struct address_space_operations { 582 int (*writepage)(struct page *page, struct writeback_control *wbc); 583 int (*readpage)(struct file *, 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 extern const struct address_space_operations empty_aops; 620 621 /* 622 * pagecache_write_begin/pagecache_write_end must be used by general code 623 * to write into the pagecache. 624 */ 625 int pagecache_write_begin(struct file *, struct address_space *mapping, 626 loff_t pos, unsigned len, unsigned flags, 627 struct page **pagep, void **fsdata); 628 629 int pagecache_write_end(struct file *, struct address_space *mapping, 630 loff_t pos, unsigned len, unsigned copied, 631 struct page *page, void *fsdata); 632 633 struct backing_dev_info; 634 struct address_space { 635 struct inode *host; /* owner: inode, block_device */ 636 struct radix_tree_root page_tree; /* radix tree of all pages */ 637 spinlock_t tree_lock; /* and lock protecting it */ 638 unsigned int i_mmap_writable;/* count VM_SHARED mappings */ 639 struct prio_tree_root i_mmap; /* tree of private and shared mappings */ 640 struct list_head i_mmap_nonlinear;/*list VM_NONLINEAR mappings */ 641 struct mutex i_mmap_mutex; /* protect tree, count, list */ 642 /* Protected by tree_lock together with the radix tree */ 643 unsigned long nrpages; /* number of total pages */ 644 pgoff_t writeback_index;/* writeback starts here */ 645 const struct address_space_operations *a_ops; /* methods */ 646 unsigned long flags; /* error bits/gfp mask */ 647 struct backing_dev_info *backing_dev_info; /* device readahead, etc */ 648 spinlock_t private_lock; /* for use by the address_space */ 649 struct list_head private_list; /* ditto */ 650 struct address_space *assoc_mapping; /* ditto */ 651 } __attribute__((aligned(sizeof(long)))); 652 /* 653 * On most architectures that alignment is already the case; but 654 * must be enforced here for CRIS, to let the least significant bit 655 * of struct page's "mapping" pointer be used for PAGE_MAPPING_ANON. 656 */ 657 658 struct block_device { 659 dev_t bd_dev; /* not a kdev_t - it's a search key */ 660 int bd_openers; 661 struct inode * bd_inode; /* will die */ 662 struct super_block * bd_super; 663 struct mutex bd_mutex; /* open/close mutex */ 664 struct list_head bd_inodes; 665 void * bd_claiming; 666 void * bd_holder; 667 int bd_holders; 668 bool bd_write_holder; 669 #ifdef CONFIG_SYSFS 670 struct list_head bd_holder_disks; 671 #endif 672 struct block_device * bd_contains; 673 unsigned bd_block_size; 674 struct hd_struct * bd_part; 675 /* number of times partitions within this device have been opened. */ 676 unsigned bd_part_count; 677 int bd_invalidated; 678 struct gendisk * bd_disk; 679 struct list_head bd_list; 680 /* 681 * Private data. You must have bd_claim'ed the block_device 682 * to use this. NOTE: bd_claim allows an owner to claim 683 * the same device multiple times, the owner must take special 684 * care to not mess up bd_private for that case. 685 */ 686 unsigned long bd_private; 687 688 /* The counter of freeze processes */ 689 int bd_fsfreeze_count; 690 /* Mutex for freeze */ 691 struct mutex bd_fsfreeze_mutex; 692 }; 693 694 /* 695 * Radix-tree tags, for tagging dirty and writeback pages within the pagecache 696 * radix trees 697 */ 698 #define PAGECACHE_TAG_DIRTY 0 699 #define PAGECACHE_TAG_WRITEBACK 1 700 #define PAGECACHE_TAG_TOWRITE 2 701 702 int mapping_tagged(struct address_space *mapping, int tag); 703 704 /* 705 * Might pages of this file be mapped into userspace? 706 */ 707 static inline int mapping_mapped(struct address_space *mapping) 708 { 709 return !prio_tree_empty(&mapping->i_mmap) || 710 !list_empty(&mapping->i_mmap_nonlinear); 711 } 712 713 /* 714 * Might pages of this file have been modified in userspace? 715 * Note that i_mmap_writable counts all VM_SHARED vmas: do_mmap_pgoff 716 * marks vma as VM_SHARED if it is shared, and the file was opened for 717 * writing i.e. vma may be mprotected writable even if now readonly. 718 */ 719 static inline int mapping_writably_mapped(struct address_space *mapping) 720 { 721 return mapping->i_mmap_writable != 0; 722 } 723 724 /* 725 * Use sequence counter to get consistent i_size on 32-bit processors. 726 */ 727 #if BITS_PER_LONG==32 && defined(CONFIG_SMP) 728 #include <linux/seqlock.h> 729 #define __NEED_I_SIZE_ORDERED 730 #define i_size_ordered_init(inode) seqcount_init(&inode->i_size_seqcount) 731 #else 732 #define i_size_ordered_init(inode) do { } while (0) 733 #endif 734 735 struct posix_acl; 736 #define ACL_NOT_CACHED ((void *)(-1)) 737 738 struct inode { 739 /* RCU path lookup touches following: */ 740 umode_t i_mode; 741 uid_t i_uid; 742 gid_t i_gid; 743 const struct inode_operations *i_op; 744 struct super_block *i_sb; 745 746 spinlock_t i_lock; /* i_blocks, i_bytes, maybe i_size */ 747 unsigned int i_flags; 748 unsigned long i_state; 749 #ifdef CONFIG_SECURITY 750 void *i_security; 751 #endif 752 struct mutex i_mutex; 753 754 755 unsigned long dirtied_when; /* jiffies of first dirtying */ 756 757 struct hlist_node i_hash; 758 struct list_head i_wb_list; /* backing dev IO list */ 759 struct list_head i_lru; /* inode LRU list */ 760 struct list_head i_sb_list; 761 union { 762 struct list_head i_dentry; 763 struct rcu_head i_rcu; 764 }; 765 unsigned long i_ino; 766 atomic_t i_count; 767 unsigned int i_nlink; 768 dev_t i_rdev; 769 unsigned int i_blkbits; 770 u64 i_version; 771 loff_t i_size; 772 #ifdef __NEED_I_SIZE_ORDERED 773 seqcount_t i_size_seqcount; 774 #endif 775 struct timespec i_atime; 776 struct timespec i_mtime; 777 struct timespec i_ctime; 778 blkcnt_t i_blocks; 779 unsigned short i_bytes; 780 struct rw_semaphore i_alloc_sem; 781 const struct file_operations *i_fop; /* former ->i_op->default_file_ops */ 782 struct file_lock *i_flock; 783 struct address_space *i_mapping; 784 struct address_space i_data; 785 #ifdef CONFIG_QUOTA 786 struct dquot *i_dquot[MAXQUOTAS]; 787 #endif 788 struct list_head i_devices; 789 union { 790 struct pipe_inode_info *i_pipe; 791 struct block_device *i_bdev; 792 struct cdev *i_cdev; 793 }; 794 795 __u32 i_generation; 796 797 #ifdef CONFIG_FSNOTIFY 798 __u32 i_fsnotify_mask; /* all events this inode cares about */ 799 struct hlist_head i_fsnotify_marks; 800 #endif 801 802 #ifdef CONFIG_IMA 803 atomic_t i_readcount; /* struct files open RO */ 804 #endif 805 atomic_t i_writecount; 806 #ifdef CONFIG_FS_POSIX_ACL 807 struct posix_acl *i_acl; 808 struct posix_acl *i_default_acl; 809 #endif 810 void *i_private; /* fs or device private pointer */ 811 }; 812 813 static inline int inode_unhashed(struct inode *inode) 814 { 815 return hlist_unhashed(&inode->i_hash); 816 } 817 818 /* 819 * inode->i_mutex nesting subclasses for the lock validator: 820 * 821 * 0: the object of the current VFS operation 822 * 1: parent 823 * 2: child/target 824 * 3: quota file 825 * 826 * The locking order between these classes is 827 * parent -> child -> normal -> xattr -> quota 828 */ 829 enum inode_i_mutex_lock_class 830 { 831 I_MUTEX_NORMAL, 832 I_MUTEX_PARENT, 833 I_MUTEX_CHILD, 834 I_MUTEX_XATTR, 835 I_MUTEX_QUOTA 836 }; 837 838 /* 839 * NOTE: in a 32bit arch with a preemptable kernel and 840 * an UP compile the i_size_read/write must be atomic 841 * with respect to the local cpu (unlike with preempt disabled), 842 * but they don't need to be atomic with respect to other cpus like in 843 * true SMP (so they need either to either locally disable irq around 844 * the read or for example on x86 they can be still implemented as a 845 * cmpxchg8b without the need of the lock prefix). For SMP compiles 846 * and 64bit archs it makes no difference if preempt is enabled or not. 847 */ 848 static inline loff_t i_size_read(const struct inode *inode) 849 { 850 #if BITS_PER_LONG==32 && defined(CONFIG_SMP) 851 loff_t i_size; 852 unsigned int seq; 853 854 do { 855 seq = read_seqcount_begin(&inode->i_size_seqcount); 856 i_size = inode->i_size; 857 } while (read_seqcount_retry(&inode->i_size_seqcount, seq)); 858 return i_size; 859 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT) 860 loff_t i_size; 861 862 preempt_disable(); 863 i_size = inode->i_size; 864 preempt_enable(); 865 return i_size; 866 #else 867 return inode->i_size; 868 #endif 869 } 870 871 /* 872 * NOTE: unlike i_size_read(), i_size_write() does need locking around it 873 * (normally i_mutex), otherwise on 32bit/SMP an update of i_size_seqcount 874 * can be lost, resulting in subsequent i_size_read() calls spinning forever. 875 */ 876 static inline void i_size_write(struct inode *inode, loff_t i_size) 877 { 878 #if BITS_PER_LONG==32 && defined(CONFIG_SMP) 879 write_seqcount_begin(&inode->i_size_seqcount); 880 inode->i_size = i_size; 881 write_seqcount_end(&inode->i_size_seqcount); 882 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT) 883 preempt_disable(); 884 inode->i_size = i_size; 885 preempt_enable(); 886 #else 887 inode->i_size = i_size; 888 #endif 889 } 890 891 static inline unsigned iminor(const struct inode *inode) 892 { 893 return MINOR(inode->i_rdev); 894 } 895 896 static inline unsigned imajor(const struct inode *inode) 897 { 898 return MAJOR(inode->i_rdev); 899 } 900 901 extern struct block_device *I_BDEV(struct inode *inode); 902 903 struct fown_struct { 904 rwlock_t lock; /* protects pid, uid, euid fields */ 905 struct pid *pid; /* pid or -pgrp where SIGIO should be sent */ 906 enum pid_type pid_type; /* Kind of process group SIGIO should be sent to */ 907 uid_t uid, euid; /* uid/euid of process setting the owner */ 908 int signum; /* posix.1b rt signal to be delivered on IO */ 909 }; 910 911 /* 912 * Track a single file's readahead state 913 */ 914 struct file_ra_state { 915 pgoff_t start; /* where readahead started */ 916 unsigned int size; /* # of readahead pages */ 917 unsigned int async_size; /* do asynchronous readahead when 918 there are only # of pages ahead */ 919 920 unsigned int ra_pages; /* Maximum readahead window */ 921 unsigned int mmap_miss; /* Cache miss stat for mmap accesses */ 922 loff_t prev_pos; /* Cache last read() position */ 923 }; 924 925 /* 926 * Check if @index falls in the readahead windows. 927 */ 928 static inline int ra_has_index(struct file_ra_state *ra, pgoff_t index) 929 { 930 return (index >= ra->start && 931 index < ra->start + ra->size); 932 } 933 934 #define FILE_MNT_WRITE_TAKEN 1 935 #define FILE_MNT_WRITE_RELEASED 2 936 937 struct file { 938 /* 939 * fu_list becomes invalid after file_free is called and queued via 940 * fu_rcuhead for RCU freeing 941 */ 942 union { 943 struct list_head fu_list; 944 struct rcu_head fu_rcuhead; 945 } f_u; 946 struct path f_path; 947 #define f_dentry f_path.dentry 948 #define f_vfsmnt f_path.mnt 949 const struct file_operations *f_op; 950 spinlock_t f_lock; /* f_ep_links, f_flags, no IRQ */ 951 #ifdef CONFIG_SMP 952 int f_sb_list_cpu; 953 #endif 954 atomic_long_t f_count; 955 unsigned int f_flags; 956 fmode_t f_mode; 957 loff_t f_pos; 958 struct fown_struct f_owner; 959 const struct cred *f_cred; 960 struct file_ra_state f_ra; 961 962 u64 f_version; 963 #ifdef CONFIG_SECURITY 964 void *f_security; 965 #endif 966 /* needed for tty driver, and maybe others */ 967 void *private_data; 968 969 #ifdef CONFIG_EPOLL 970 /* Used by fs/eventpoll.c to link all the hooks to this file */ 971 struct list_head f_ep_links; 972 #endif /* #ifdef CONFIG_EPOLL */ 973 struct address_space *f_mapping; 974 #ifdef CONFIG_DEBUG_WRITECOUNT 975 unsigned long f_mnt_write_state; 976 #endif 977 }; 978 979 struct file_handle { 980 __u32 handle_bytes; 981 int handle_type; 982 /* file identifier */ 983 unsigned char f_handle[0]; 984 }; 985 986 #define get_file(x) atomic_long_inc(&(x)->f_count) 987 #define fput_atomic(x) atomic_long_add_unless(&(x)->f_count, -1, 1) 988 #define file_count(x) atomic_long_read(&(x)->f_count) 989 990 #ifdef CONFIG_DEBUG_WRITECOUNT 991 static inline void file_take_write(struct file *f) 992 { 993 WARN_ON(f->f_mnt_write_state != 0); 994 f->f_mnt_write_state = FILE_MNT_WRITE_TAKEN; 995 } 996 static inline void file_release_write(struct file *f) 997 { 998 f->f_mnt_write_state |= FILE_MNT_WRITE_RELEASED; 999 } 1000 static inline void file_reset_write(struct file *f) 1001 { 1002 f->f_mnt_write_state = 0; 1003 } 1004 static inline void file_check_state(struct file *f) 1005 { 1006 /* 1007 * At this point, either both or neither of these bits 1008 * should be set. 1009 */ 1010 WARN_ON(f->f_mnt_write_state == FILE_MNT_WRITE_TAKEN); 1011 WARN_ON(f->f_mnt_write_state == FILE_MNT_WRITE_RELEASED); 1012 } 1013 static inline int file_check_writeable(struct file *f) 1014 { 1015 if (f->f_mnt_write_state == FILE_MNT_WRITE_TAKEN) 1016 return 0; 1017 printk(KERN_WARNING "writeable file with no " 1018 "mnt_want_write()\n"); 1019 WARN_ON(1); 1020 return -EINVAL; 1021 } 1022 #else /* !CONFIG_DEBUG_WRITECOUNT */ 1023 static inline void file_take_write(struct file *filp) {} 1024 static inline void file_release_write(struct file *filp) {} 1025 static inline void file_reset_write(struct file *filp) {} 1026 static inline void file_check_state(struct file *filp) {} 1027 static inline int file_check_writeable(struct file *filp) 1028 { 1029 return 0; 1030 } 1031 #endif /* CONFIG_DEBUG_WRITECOUNT */ 1032 1033 #define MAX_NON_LFS ((1UL<<31) - 1) 1034 1035 /* Page cache limit. The filesystems should put that into their s_maxbytes 1036 limits, otherwise bad things can happen in VM. */ 1037 #if BITS_PER_LONG==32 1038 #define MAX_LFS_FILESIZE (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1) 1039 #elif BITS_PER_LONG==64 1040 #define MAX_LFS_FILESIZE 0x7fffffffffffffffUL 1041 #endif 1042 1043 #define FL_POSIX 1 1044 #define FL_FLOCK 2 1045 #define FL_ACCESS 8 /* not trying to lock, just looking */ 1046 #define FL_EXISTS 16 /* when unlocking, test for existence */ 1047 #define FL_LEASE 32 /* lease held on this file */ 1048 #define FL_CLOSE 64 /* unlock on close */ 1049 #define FL_SLEEP 128 /* A blocking lock */ 1050 1051 /* 1052 * Special return value from posix_lock_file() and vfs_lock_file() for 1053 * asynchronous locking. 1054 */ 1055 #define FILE_LOCK_DEFERRED 1 1056 1057 /* 1058 * The POSIX file lock owner is determined by 1059 * the "struct files_struct" in the thread group 1060 * (or NULL for no owner - BSD locks). 1061 * 1062 * Lockd stuffs a "host" pointer into this. 1063 */ 1064 typedef struct files_struct *fl_owner_t; 1065 1066 struct file_lock_operations { 1067 void (*fl_copy_lock)(struct file_lock *, struct file_lock *); 1068 void (*fl_release_private)(struct file_lock *); 1069 }; 1070 1071 struct lock_manager_operations { 1072 int (*fl_compare_owner)(struct file_lock *, struct file_lock *); 1073 void (*fl_notify)(struct file_lock *); /* unblock callback */ 1074 int (*fl_grant)(struct file_lock *, struct file_lock *, int); 1075 void (*fl_release_private)(struct file_lock *); 1076 void (*fl_break)(struct file_lock *); 1077 int (*fl_change)(struct file_lock **, int); 1078 }; 1079 1080 struct lock_manager { 1081 struct list_head list; 1082 }; 1083 1084 void locks_start_grace(struct lock_manager *); 1085 void locks_end_grace(struct lock_manager *); 1086 int locks_in_grace(void); 1087 1088 /* that will die - we need it for nfs_lock_info */ 1089 #include <linux/nfs_fs_i.h> 1090 1091 struct file_lock { 1092 struct file_lock *fl_next; /* singly linked list for this inode */ 1093 struct list_head fl_link; /* doubly linked list of all locks */ 1094 struct list_head fl_block; /* circular list of blocked processes */ 1095 fl_owner_t fl_owner; 1096 unsigned char fl_flags; 1097 unsigned char fl_type; 1098 unsigned int fl_pid; 1099 struct pid *fl_nspid; 1100 wait_queue_head_t fl_wait; 1101 struct file *fl_file; 1102 loff_t fl_start; 1103 loff_t fl_end; 1104 1105 struct fasync_struct * fl_fasync; /* for lease break notifications */ 1106 unsigned long fl_break_time; /* for nonblocking lease breaks */ 1107 1108 const struct file_lock_operations *fl_ops; /* Callbacks for filesystems */ 1109 const struct lock_manager_operations *fl_lmops; /* Callbacks for lockmanagers */ 1110 union { 1111 struct nfs_lock_info nfs_fl; 1112 struct nfs4_lock_info nfs4_fl; 1113 struct { 1114 struct list_head link; /* link in AFS vnode's pending_locks list */ 1115 int state; /* state of grant or error if -ve */ 1116 } afs; 1117 } fl_u; 1118 }; 1119 1120 /* The following constant reflects the upper bound of the file/locking space */ 1121 #ifndef OFFSET_MAX 1122 #define INT_LIMIT(x) (~((x)1 << (sizeof(x)*8 - 1))) 1123 #define OFFSET_MAX INT_LIMIT(loff_t) 1124 #define OFFT_OFFSET_MAX INT_LIMIT(off_t) 1125 #endif 1126 1127 #include <linux/fcntl.h> 1128 1129 extern void send_sigio(struct fown_struct *fown, int fd, int band); 1130 1131 #ifdef CONFIG_FILE_LOCKING 1132 extern int fcntl_getlk(struct file *, struct flock __user *); 1133 extern int fcntl_setlk(unsigned int, struct file *, unsigned int, 1134 struct flock __user *); 1135 1136 #if BITS_PER_LONG == 32 1137 extern int fcntl_getlk64(struct file *, struct flock64 __user *); 1138 extern int fcntl_setlk64(unsigned int, struct file *, unsigned int, 1139 struct flock64 __user *); 1140 #endif 1141 1142 extern int fcntl_setlease(unsigned int fd, struct file *filp, long arg); 1143 extern int fcntl_getlease(struct file *filp); 1144 1145 /* fs/locks.c */ 1146 void locks_free_lock(struct file_lock *fl); 1147 extern void locks_init_lock(struct file_lock *); 1148 extern struct file_lock * locks_alloc_lock(void); 1149 extern void locks_copy_lock(struct file_lock *, struct file_lock *); 1150 extern void __locks_copy_lock(struct file_lock *, const struct file_lock *); 1151 extern void locks_remove_posix(struct file *, fl_owner_t); 1152 extern void locks_remove_flock(struct file *); 1153 extern void locks_release_private(struct file_lock *); 1154 extern void posix_test_lock(struct file *, struct file_lock *); 1155 extern int posix_lock_file(struct file *, struct file_lock *, struct file_lock *); 1156 extern int posix_lock_file_wait(struct file *, struct file_lock *); 1157 extern int posix_unblock_lock(struct file *, struct file_lock *); 1158 extern int vfs_test_lock(struct file *, struct file_lock *); 1159 extern int vfs_lock_file(struct file *, unsigned int, struct file_lock *, struct file_lock *); 1160 extern int vfs_cancel_lock(struct file *filp, struct file_lock *fl); 1161 extern int flock_lock_file_wait(struct file *filp, struct file_lock *fl); 1162 extern int __break_lease(struct inode *inode, unsigned int flags); 1163 extern void lease_get_mtime(struct inode *, struct timespec *time); 1164 extern int generic_setlease(struct file *, long, struct file_lock **); 1165 extern int vfs_setlease(struct file *, long, struct file_lock **); 1166 extern int lease_modify(struct file_lock **, int); 1167 extern int lock_may_read(struct inode *, loff_t start, unsigned long count); 1168 extern int lock_may_write(struct inode *, loff_t start, unsigned long count); 1169 extern void lock_flocks(void); 1170 extern void unlock_flocks(void); 1171 #else /* !CONFIG_FILE_LOCKING */ 1172 static inline int fcntl_getlk(struct file *file, struct flock __user *user) 1173 { 1174 return -EINVAL; 1175 } 1176 1177 static inline int fcntl_setlk(unsigned int fd, struct file *file, 1178 unsigned int cmd, struct flock __user *user) 1179 { 1180 return -EACCES; 1181 } 1182 1183 #if BITS_PER_LONG == 32 1184 static inline int fcntl_getlk64(struct file *file, struct flock64 __user *user) 1185 { 1186 return -EINVAL; 1187 } 1188 1189 static inline int fcntl_setlk64(unsigned int fd, struct file *file, 1190 unsigned int cmd, struct flock64 __user *user) 1191 { 1192 return -EACCES; 1193 } 1194 #endif 1195 static inline int fcntl_setlease(unsigned int fd, struct file *filp, long arg) 1196 { 1197 return 0; 1198 } 1199 1200 static inline int fcntl_getlease(struct file *filp) 1201 { 1202 return 0; 1203 } 1204 1205 static inline void locks_init_lock(struct file_lock *fl) 1206 { 1207 return; 1208 } 1209 1210 static inline void __locks_copy_lock(struct file_lock *new, struct file_lock *fl) 1211 { 1212 return; 1213 } 1214 1215 static inline void locks_copy_lock(struct file_lock *new, struct file_lock *fl) 1216 { 1217 return; 1218 } 1219 1220 static inline void locks_remove_posix(struct file *filp, fl_owner_t owner) 1221 { 1222 return; 1223 } 1224 1225 static inline void locks_remove_flock(struct file *filp) 1226 { 1227 return; 1228 } 1229 1230 static inline void posix_test_lock(struct file *filp, struct file_lock *fl) 1231 { 1232 return; 1233 } 1234 1235 static inline int posix_lock_file(struct file *filp, struct file_lock *fl, 1236 struct file_lock *conflock) 1237 { 1238 return -ENOLCK; 1239 } 1240 1241 static inline int posix_lock_file_wait(struct file *filp, struct file_lock *fl) 1242 { 1243 return -ENOLCK; 1244 } 1245 1246 static inline int posix_unblock_lock(struct file *filp, 1247 struct file_lock *waiter) 1248 { 1249 return -ENOENT; 1250 } 1251 1252 static inline int vfs_test_lock(struct file *filp, struct file_lock *fl) 1253 { 1254 return 0; 1255 } 1256 1257 static inline int vfs_lock_file(struct file *filp, unsigned int cmd, 1258 struct file_lock *fl, struct file_lock *conf) 1259 { 1260 return -ENOLCK; 1261 } 1262 1263 static inline int vfs_cancel_lock(struct file *filp, struct file_lock *fl) 1264 { 1265 return 0; 1266 } 1267 1268 static inline int flock_lock_file_wait(struct file *filp, 1269 struct file_lock *request) 1270 { 1271 return -ENOLCK; 1272 } 1273 1274 static inline int __break_lease(struct inode *inode, unsigned int mode) 1275 { 1276 return 0; 1277 } 1278 1279 static inline void lease_get_mtime(struct inode *inode, struct timespec *time) 1280 { 1281 return; 1282 } 1283 1284 static inline int generic_setlease(struct file *filp, long arg, 1285 struct file_lock **flp) 1286 { 1287 return -EINVAL; 1288 } 1289 1290 static inline int vfs_setlease(struct file *filp, long arg, 1291 struct file_lock **lease) 1292 { 1293 return -EINVAL; 1294 } 1295 1296 static inline int lease_modify(struct file_lock **before, int arg) 1297 { 1298 return -EINVAL; 1299 } 1300 1301 static inline int lock_may_read(struct inode *inode, loff_t start, 1302 unsigned long len) 1303 { 1304 return 1; 1305 } 1306 1307 static inline int lock_may_write(struct inode *inode, loff_t start, 1308 unsigned long len) 1309 { 1310 return 1; 1311 } 1312 1313 static inline void lock_flocks(void) 1314 { 1315 } 1316 1317 static inline void unlock_flocks(void) 1318 { 1319 } 1320 1321 #endif /* !CONFIG_FILE_LOCKING */ 1322 1323 1324 struct fasync_struct { 1325 spinlock_t fa_lock; 1326 int magic; 1327 int fa_fd; 1328 struct fasync_struct *fa_next; /* singly linked list */ 1329 struct file *fa_file; 1330 struct rcu_head fa_rcu; 1331 }; 1332 1333 #define FASYNC_MAGIC 0x4601 1334 1335 /* SMP safe fasync helpers: */ 1336 extern int fasync_helper(int, struct file *, int, struct fasync_struct **); 1337 extern struct fasync_struct *fasync_insert_entry(int, struct file *, struct fasync_struct **, struct fasync_struct *); 1338 extern int fasync_remove_entry(struct file *, struct fasync_struct **); 1339 extern struct fasync_struct *fasync_alloc(void); 1340 extern void fasync_free(struct fasync_struct *); 1341 1342 /* can be called from interrupts */ 1343 extern void kill_fasync(struct fasync_struct **, int, int); 1344 1345 extern int __f_setown(struct file *filp, struct pid *, enum pid_type, int force); 1346 extern int f_setown(struct file *filp, unsigned long arg, int force); 1347 extern void f_delown(struct file *filp); 1348 extern pid_t f_getown(struct file *filp); 1349 extern int send_sigurg(struct fown_struct *fown); 1350 1351 /* 1352 * Umount options 1353 */ 1354 1355 #define MNT_FORCE 0x00000001 /* Attempt to forcibily umount */ 1356 #define MNT_DETACH 0x00000002 /* Just detach from the tree */ 1357 #define MNT_EXPIRE 0x00000004 /* Mark for expiry */ 1358 #define UMOUNT_NOFOLLOW 0x00000008 /* Don't follow symlink on umount */ 1359 #define UMOUNT_UNUSED 0x80000000 /* Flag guaranteed to be unused */ 1360 1361 extern struct list_head super_blocks; 1362 extern spinlock_t sb_lock; 1363 1364 struct super_block { 1365 struct list_head s_list; /* Keep this first */ 1366 dev_t s_dev; /* search index; _not_ kdev_t */ 1367 unsigned char s_dirt; 1368 unsigned char s_blocksize_bits; 1369 unsigned long s_blocksize; 1370 loff_t s_maxbytes; /* Max file size */ 1371 struct file_system_type *s_type; 1372 const struct super_operations *s_op; 1373 const struct dquot_operations *dq_op; 1374 const struct quotactl_ops *s_qcop; 1375 const struct export_operations *s_export_op; 1376 unsigned long s_flags; 1377 unsigned long s_magic; 1378 struct dentry *s_root; 1379 struct rw_semaphore s_umount; 1380 struct mutex s_lock; 1381 int s_count; 1382 atomic_t s_active; 1383 #ifdef CONFIG_SECURITY 1384 void *s_security; 1385 #endif 1386 const struct xattr_handler **s_xattr; 1387 1388 struct list_head s_inodes; /* all inodes */ 1389 struct hlist_bl_head s_anon; /* anonymous dentries for (nfs) exporting */ 1390 #ifdef CONFIG_SMP 1391 struct list_head __percpu *s_files; 1392 #else 1393 struct list_head s_files; 1394 #endif 1395 /* s_dentry_lru, s_nr_dentry_unused protected by dcache.c lru locks */ 1396 struct list_head s_dentry_lru; /* unused dentry lru */ 1397 int s_nr_dentry_unused; /* # of dentry on lru */ 1398 1399 struct block_device *s_bdev; 1400 struct backing_dev_info *s_bdi; 1401 struct mtd_info *s_mtd; 1402 struct list_head s_instances; 1403 struct quota_info s_dquot; /* Diskquota specific options */ 1404 1405 int s_frozen; 1406 wait_queue_head_t s_wait_unfrozen; 1407 1408 char s_id[32]; /* Informational name */ 1409 u8 s_uuid[16]; /* UUID */ 1410 1411 void *s_fs_info; /* Filesystem private info */ 1412 fmode_t s_mode; 1413 1414 /* Granularity of c/m/atime in ns. 1415 Cannot be worse than a second */ 1416 u32 s_time_gran; 1417 1418 /* 1419 * The next field is for VFS *only*. No filesystems have any business 1420 * even looking at it. You had been warned. 1421 */ 1422 struct mutex s_vfs_rename_mutex; /* Kludge */ 1423 1424 /* 1425 * Filesystem subtype. If non-empty the filesystem type field 1426 * in /proc/mounts will be "type.subtype" 1427 */ 1428 char *s_subtype; 1429 1430 /* 1431 * Saved mount options for lazy filesystems using 1432 * generic_show_options() 1433 */ 1434 char __rcu *s_options; 1435 const struct dentry_operations *s_d_op; /* default d_op for dentries */ 1436 1437 /* 1438 * Saved pool identifier for cleancache (-1 means none) 1439 */ 1440 int cleancache_poolid; 1441 }; 1442 1443 extern struct timespec current_fs_time(struct super_block *sb); 1444 1445 /* 1446 * Snapshotting support. 1447 */ 1448 enum { 1449 SB_UNFROZEN = 0, 1450 SB_FREEZE_WRITE = 1, 1451 SB_FREEZE_TRANS = 2, 1452 }; 1453 1454 #define vfs_check_frozen(sb, level) \ 1455 wait_event((sb)->s_wait_unfrozen, ((sb)->s_frozen < (level))) 1456 1457 #define get_fs_excl() atomic_inc(&current->fs_excl) 1458 #define put_fs_excl() atomic_dec(&current->fs_excl) 1459 #define has_fs_excl() atomic_read(&current->fs_excl) 1460 1461 /* 1462 * until VFS tracks user namespaces for inodes, just make all files 1463 * belong to init_user_ns 1464 */ 1465 extern struct user_namespace init_user_ns; 1466 #define inode_userns(inode) (&init_user_ns) 1467 extern bool inode_owner_or_capable(const struct inode *inode); 1468 1469 /* not quite ready to be deprecated, but... */ 1470 extern void lock_super(struct super_block *); 1471 extern void unlock_super(struct super_block *); 1472 1473 /* 1474 * VFS helper functions.. 1475 */ 1476 extern int vfs_create(struct inode *, struct dentry *, int, struct nameidata *); 1477 extern int vfs_mkdir(struct inode *, struct dentry *, int); 1478 extern int vfs_mknod(struct inode *, struct dentry *, int, dev_t); 1479 extern int vfs_symlink(struct inode *, struct dentry *, const char *); 1480 extern int vfs_link(struct dentry *, struct inode *, struct dentry *); 1481 extern int vfs_rmdir(struct inode *, struct dentry *); 1482 extern int vfs_unlink(struct inode *, struct dentry *); 1483 extern int vfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *); 1484 1485 /* 1486 * VFS dentry helper functions. 1487 */ 1488 extern void dentry_unhash(struct dentry *dentry); 1489 1490 /* 1491 * VFS file helper functions. 1492 */ 1493 extern int file_permission(struct file *, int); 1494 extern void inode_init_owner(struct inode *inode, const struct inode *dir, 1495 mode_t mode); 1496 /* 1497 * VFS FS_IOC_FIEMAP helper definitions. 1498 */ 1499 struct fiemap_extent_info { 1500 unsigned int fi_flags; /* Flags as passed from user */ 1501 unsigned int fi_extents_mapped; /* Number of mapped extents */ 1502 unsigned int fi_extents_max; /* Size of fiemap_extent array */ 1503 struct fiemap_extent __user *fi_extents_start; /* Start of 1504 fiemap_extent array */ 1505 }; 1506 int fiemap_fill_next_extent(struct fiemap_extent_info *info, u64 logical, 1507 u64 phys, u64 len, u32 flags); 1508 int fiemap_check_flags(struct fiemap_extent_info *fieinfo, u32 fs_flags); 1509 1510 /* 1511 * File types 1512 * 1513 * NOTE! These match bits 12..15 of stat.st_mode 1514 * (ie "(i_mode >> 12) & 15"). 1515 */ 1516 #define DT_UNKNOWN 0 1517 #define DT_FIFO 1 1518 #define DT_CHR 2 1519 #define DT_DIR 4 1520 #define DT_BLK 6 1521 #define DT_REG 8 1522 #define DT_LNK 10 1523 #define DT_SOCK 12 1524 #define DT_WHT 14 1525 1526 /* 1527 * This is the "filldir" function type, used by readdir() to let 1528 * the kernel specify what kind of dirent layout it wants to have. 1529 * This allows the kernel to read directories into kernel space or 1530 * to have different dirent layouts depending on the binary type. 1531 */ 1532 typedef int (*filldir_t)(void *, const char *, int, loff_t, u64, unsigned); 1533 struct block_device_operations; 1534 1535 /* These macros are for out of kernel modules to test that 1536 * the kernel supports the unlocked_ioctl and compat_ioctl 1537 * fields in struct file_operations. */ 1538 #define HAVE_COMPAT_IOCTL 1 1539 #define HAVE_UNLOCKED_IOCTL 1 1540 1541 /* 1542 * NOTE: 1543 * all file operations except setlease can be called without 1544 * the big kernel lock held in all filesystems. 1545 */ 1546 struct file_operations { 1547 struct module *owner; 1548 loff_t (*llseek) (struct file *, loff_t, int); 1549 ssize_t (*read) (struct file *, char __user *, size_t, loff_t *); 1550 ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *); 1551 ssize_t (*aio_read) (struct kiocb *, const struct iovec *, unsigned long, loff_t); 1552 ssize_t (*aio_write) (struct kiocb *, const struct iovec *, unsigned long, loff_t); 1553 int (*readdir) (struct file *, void *, filldir_t); 1554 unsigned int (*poll) (struct file *, struct poll_table_struct *); 1555 long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long); 1556 long (*compat_ioctl) (struct file *, unsigned int, unsigned long); 1557 int (*mmap) (struct file *, struct vm_area_struct *); 1558 int (*open) (struct inode *, struct file *); 1559 int (*flush) (struct file *, fl_owner_t id); 1560 int (*release) (struct inode *, struct file *); 1561 int (*fsync) (struct file *, int datasync); 1562 int (*aio_fsync) (struct kiocb *, int datasync); 1563 int (*fasync) (int, struct file *, int); 1564 int (*lock) (struct file *, int, struct file_lock *); 1565 ssize_t (*sendpage) (struct file *, struct page *, int, size_t, loff_t *, int); 1566 unsigned long (*get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long); 1567 int (*check_flags)(int); 1568 int (*flock) (struct file *, int, struct file_lock *); 1569 ssize_t (*splice_write)(struct pipe_inode_info *, struct file *, loff_t *, size_t, unsigned int); 1570 ssize_t (*splice_read)(struct file *, loff_t *, struct pipe_inode_info *, size_t, unsigned int); 1571 int (*setlease)(struct file *, long, struct file_lock **); 1572 long (*fallocate)(struct file *file, int mode, loff_t offset, 1573 loff_t len); 1574 }; 1575 1576 #define IPERM_FLAG_RCU 0x0001 1577 1578 struct inode_operations { 1579 struct dentry * (*lookup) (struct inode *,struct dentry *, struct nameidata *); 1580 void * (*follow_link) (struct dentry *, struct nameidata *); 1581 int (*permission) (struct inode *, int, unsigned int); 1582 int (*check_acl)(struct inode *, int, unsigned int); 1583 1584 int (*readlink) (struct dentry *, char __user *,int); 1585 void (*put_link) (struct dentry *, struct nameidata *, void *); 1586 1587 int (*create) (struct inode *,struct dentry *,int, struct nameidata *); 1588 int (*link) (struct dentry *,struct inode *,struct dentry *); 1589 int (*unlink) (struct inode *,struct dentry *); 1590 int (*symlink) (struct inode *,struct dentry *,const char *); 1591 int (*mkdir) (struct inode *,struct dentry *,int); 1592 int (*rmdir) (struct inode *,struct dentry *); 1593 int (*mknod) (struct inode *,struct dentry *,int,dev_t); 1594 int (*rename) (struct inode *, struct dentry *, 1595 struct inode *, struct dentry *); 1596 void (*truncate) (struct inode *); 1597 int (*setattr) (struct dentry *, struct iattr *); 1598 int (*getattr) (struct vfsmount *mnt, struct dentry *, struct kstat *); 1599 int (*setxattr) (struct dentry *, const char *,const void *,size_t,int); 1600 ssize_t (*getxattr) (struct dentry *, const char *, void *, size_t); 1601 ssize_t (*listxattr) (struct dentry *, char *, size_t); 1602 int (*removexattr) (struct dentry *, const char *); 1603 void (*truncate_range)(struct inode *, loff_t, loff_t); 1604 int (*fiemap)(struct inode *, struct fiemap_extent_info *, u64 start, 1605 u64 len); 1606 } ____cacheline_aligned; 1607 1608 struct seq_file; 1609 1610 ssize_t rw_copy_check_uvector(int type, const struct iovec __user * uvector, 1611 unsigned long nr_segs, unsigned long fast_segs, 1612 struct iovec *fast_pointer, 1613 struct iovec **ret_pointer); 1614 1615 extern ssize_t vfs_read(struct file *, char __user *, size_t, loff_t *); 1616 extern ssize_t vfs_write(struct file *, const char __user *, size_t, loff_t *); 1617 extern ssize_t vfs_readv(struct file *, const struct iovec __user *, 1618 unsigned long, loff_t *); 1619 extern ssize_t vfs_writev(struct file *, const struct iovec __user *, 1620 unsigned long, loff_t *); 1621 1622 struct super_operations { 1623 struct inode *(*alloc_inode)(struct super_block *sb); 1624 void (*destroy_inode)(struct inode *); 1625 1626 void (*dirty_inode) (struct inode *, int flags); 1627 int (*write_inode) (struct inode *, struct writeback_control *wbc); 1628 int (*drop_inode) (struct inode *); 1629 void (*evict_inode) (struct inode *); 1630 void (*put_super) (struct super_block *); 1631 void (*write_super) (struct super_block *); 1632 int (*sync_fs)(struct super_block *sb, int wait); 1633 int (*freeze_fs) (struct super_block *); 1634 int (*unfreeze_fs) (struct super_block *); 1635 int (*statfs) (struct dentry *, struct kstatfs *); 1636 int (*remount_fs) (struct super_block *, int *, char *); 1637 void (*umount_begin) (struct super_block *); 1638 1639 int (*show_options)(struct seq_file *, struct vfsmount *); 1640 int (*show_devname)(struct seq_file *, struct vfsmount *); 1641 int (*show_path)(struct seq_file *, struct vfsmount *); 1642 int (*show_stats)(struct seq_file *, struct vfsmount *); 1643 #ifdef CONFIG_QUOTA 1644 ssize_t (*quota_read)(struct super_block *, int, char *, size_t, loff_t); 1645 ssize_t (*quota_write)(struct super_block *, int, const char *, size_t, loff_t); 1646 #endif 1647 int (*bdev_try_to_free_page)(struct super_block*, struct page*, gfp_t); 1648 }; 1649 1650 /* 1651 * Inode state bits. Protected by inode->i_lock 1652 * 1653 * Three bits determine the dirty state of the inode, I_DIRTY_SYNC, 1654 * I_DIRTY_DATASYNC and I_DIRTY_PAGES. 1655 * 1656 * Four bits define the lifetime of an inode. Initially, inodes are I_NEW, 1657 * until that flag is cleared. I_WILL_FREE, I_FREEING and I_CLEAR are set at 1658 * various stages of removing an inode. 1659 * 1660 * Two bits are used for locking and completion notification, I_NEW and I_SYNC. 1661 * 1662 * I_DIRTY_SYNC Inode is dirty, but doesn't have to be written on 1663 * fdatasync(). i_atime is the usual cause. 1664 * I_DIRTY_DATASYNC Data-related inode changes pending. We keep track of 1665 * these changes separately from I_DIRTY_SYNC so that we 1666 * don't have to write inode on fdatasync() when only 1667 * mtime has changed in it. 1668 * I_DIRTY_PAGES Inode has dirty pages. Inode itself may be clean. 1669 * I_NEW Serves as both a mutex and completion notification. 1670 * New inodes set I_NEW. If two processes both create 1671 * the same inode, one of them will release its inode and 1672 * wait for I_NEW to be released before returning. 1673 * Inodes in I_WILL_FREE, I_FREEING or I_CLEAR state can 1674 * also cause waiting on I_NEW, without I_NEW actually 1675 * being set. find_inode() uses this to prevent returning 1676 * nearly-dead inodes. 1677 * I_WILL_FREE Must be set when calling write_inode_now() if i_count 1678 * is zero. I_FREEING must be set when I_WILL_FREE is 1679 * cleared. 1680 * I_FREEING Set when inode is about to be freed but still has dirty 1681 * pages or buffers attached or the inode itself is still 1682 * dirty. 1683 * I_CLEAR Added by end_writeback(). In this state the inode is clean 1684 * and can be destroyed. Inode keeps I_FREEING. 1685 * 1686 * Inodes that are I_WILL_FREE, I_FREEING or I_CLEAR are 1687 * prohibited for many purposes. iget() must wait for 1688 * the inode to be completely released, then create it 1689 * anew. Other functions will just ignore such inodes, 1690 * if appropriate. I_NEW is used for waiting. 1691 * 1692 * I_SYNC Synchonized write of dirty inode data. The bits is 1693 * set during data writeback, and cleared with a wakeup 1694 * on the bit address once it is done. 1695 * 1696 * Q: What is the difference between I_WILL_FREE and I_FREEING? 1697 */ 1698 #define I_DIRTY_SYNC (1 << 0) 1699 #define I_DIRTY_DATASYNC (1 << 1) 1700 #define I_DIRTY_PAGES (1 << 2) 1701 #define __I_NEW 3 1702 #define I_NEW (1 << __I_NEW) 1703 #define I_WILL_FREE (1 << 4) 1704 #define I_FREEING (1 << 5) 1705 #define I_CLEAR (1 << 6) 1706 #define __I_SYNC 7 1707 #define I_SYNC (1 << __I_SYNC) 1708 #define I_REFERENCED (1 << 8) 1709 1710 #define I_DIRTY (I_DIRTY_SYNC | I_DIRTY_DATASYNC | I_DIRTY_PAGES) 1711 1712 extern void __mark_inode_dirty(struct inode *, int); 1713 static inline void mark_inode_dirty(struct inode *inode) 1714 { 1715 __mark_inode_dirty(inode, I_DIRTY); 1716 } 1717 1718 static inline void mark_inode_dirty_sync(struct inode *inode) 1719 { 1720 __mark_inode_dirty(inode, I_DIRTY_SYNC); 1721 } 1722 1723 /** 1724 * inc_nlink - directly increment an inode's link count 1725 * @inode: inode 1726 * 1727 * This is a low-level filesystem helper to replace any 1728 * direct filesystem manipulation of i_nlink. Currently, 1729 * it is only here for parity with dec_nlink(). 1730 */ 1731 static inline void inc_nlink(struct inode *inode) 1732 { 1733 inode->i_nlink++; 1734 } 1735 1736 static inline void inode_inc_link_count(struct inode *inode) 1737 { 1738 inc_nlink(inode); 1739 mark_inode_dirty(inode); 1740 } 1741 1742 /** 1743 * drop_nlink - directly drop an inode's link count 1744 * @inode: inode 1745 * 1746 * This is a low-level filesystem helper to replace any 1747 * direct filesystem manipulation of i_nlink. In cases 1748 * where we are attempting to track writes to the 1749 * filesystem, a decrement to zero means an imminent 1750 * write when the file is truncated and actually unlinked 1751 * on the filesystem. 1752 */ 1753 static inline void drop_nlink(struct inode *inode) 1754 { 1755 inode->i_nlink--; 1756 } 1757 1758 /** 1759 * clear_nlink - directly zero an inode's link count 1760 * @inode: inode 1761 * 1762 * This is a low-level filesystem helper to replace any 1763 * direct filesystem manipulation of i_nlink. See 1764 * drop_nlink() for why we care about i_nlink hitting zero. 1765 */ 1766 static inline void clear_nlink(struct inode *inode) 1767 { 1768 inode->i_nlink = 0; 1769 } 1770 1771 static inline void inode_dec_link_count(struct inode *inode) 1772 { 1773 drop_nlink(inode); 1774 mark_inode_dirty(inode); 1775 } 1776 1777 /** 1778 * inode_inc_iversion - increments i_version 1779 * @inode: inode that need to be updated 1780 * 1781 * Every time the inode is modified, the i_version field will be incremented. 1782 * The filesystem has to be mounted with i_version flag 1783 */ 1784 1785 static inline void inode_inc_iversion(struct inode *inode) 1786 { 1787 spin_lock(&inode->i_lock); 1788 inode->i_version++; 1789 spin_unlock(&inode->i_lock); 1790 } 1791 1792 extern void touch_atime(struct vfsmount *mnt, struct dentry *dentry); 1793 static inline void file_accessed(struct file *file) 1794 { 1795 if (!(file->f_flags & O_NOATIME)) 1796 touch_atime(file->f_path.mnt, file->f_path.dentry); 1797 } 1798 1799 int sync_inode(struct inode *inode, struct writeback_control *wbc); 1800 int sync_inode_metadata(struct inode *inode, int wait); 1801 1802 struct file_system_type { 1803 const char *name; 1804 int fs_flags; 1805 struct dentry *(*mount) (struct file_system_type *, int, 1806 const char *, void *); 1807 void (*kill_sb) (struct super_block *); 1808 struct module *owner; 1809 struct file_system_type * next; 1810 struct list_head fs_supers; 1811 1812 struct lock_class_key s_lock_key; 1813 struct lock_class_key s_umount_key; 1814 struct lock_class_key s_vfs_rename_key; 1815 1816 struct lock_class_key i_lock_key; 1817 struct lock_class_key i_mutex_key; 1818 struct lock_class_key i_mutex_dir_key; 1819 struct lock_class_key i_alloc_sem_key; 1820 }; 1821 1822 extern struct dentry *mount_ns(struct file_system_type *fs_type, int flags, 1823 void *data, int (*fill_super)(struct super_block *, void *, int)); 1824 extern struct dentry *mount_bdev(struct file_system_type *fs_type, 1825 int flags, const char *dev_name, void *data, 1826 int (*fill_super)(struct super_block *, void *, int)); 1827 extern struct dentry *mount_single(struct file_system_type *fs_type, 1828 int flags, void *data, 1829 int (*fill_super)(struct super_block *, void *, int)); 1830 extern struct dentry *mount_nodev(struct file_system_type *fs_type, 1831 int flags, void *data, 1832 int (*fill_super)(struct super_block *, void *, int)); 1833 void generic_shutdown_super(struct super_block *sb); 1834 void kill_block_super(struct super_block *sb); 1835 void kill_anon_super(struct super_block *sb); 1836 void kill_litter_super(struct super_block *sb); 1837 void deactivate_super(struct super_block *sb); 1838 void deactivate_locked_super(struct super_block *sb); 1839 int set_anon_super(struct super_block *s, void *data); 1840 struct super_block *sget(struct file_system_type *type, 1841 int (*test)(struct super_block *,void *), 1842 int (*set)(struct super_block *,void *), 1843 void *data); 1844 extern struct dentry *mount_pseudo(struct file_system_type *, char *, 1845 const struct super_operations *ops, 1846 const struct dentry_operations *dops, 1847 unsigned long); 1848 1849 static inline void sb_mark_dirty(struct super_block *sb) 1850 { 1851 sb->s_dirt = 1; 1852 } 1853 static inline void sb_mark_clean(struct super_block *sb) 1854 { 1855 sb->s_dirt = 0; 1856 } 1857 static inline int sb_is_dirty(struct super_block *sb) 1858 { 1859 return sb->s_dirt; 1860 } 1861 1862 /* Alas, no aliases. Too much hassle with bringing module.h everywhere */ 1863 #define fops_get(fops) \ 1864 (((fops) && try_module_get((fops)->owner) ? (fops) : NULL)) 1865 #define fops_put(fops) \ 1866 do { if (fops) module_put((fops)->owner); } while(0) 1867 1868 extern int register_filesystem(struct file_system_type *); 1869 extern int unregister_filesystem(struct file_system_type *); 1870 extern struct vfsmount *kern_mount_data(struct file_system_type *, void *data); 1871 #define kern_mount(type) kern_mount_data(type, NULL) 1872 extern int may_umount_tree(struct vfsmount *); 1873 extern int may_umount(struct vfsmount *); 1874 extern long do_mount(char *, char *, char *, unsigned long, void *); 1875 extern struct vfsmount *collect_mounts(struct path *); 1876 extern void drop_collected_mounts(struct vfsmount *); 1877 extern int iterate_mounts(int (*)(struct vfsmount *, void *), void *, 1878 struct vfsmount *); 1879 extern int vfs_statfs(struct path *, struct kstatfs *); 1880 extern int user_statfs(const char __user *, struct kstatfs *); 1881 extern int fd_statfs(int, struct kstatfs *); 1882 extern int statfs_by_dentry(struct dentry *, struct kstatfs *); 1883 extern int freeze_super(struct super_block *super); 1884 extern int thaw_super(struct super_block *super); 1885 1886 extern int current_umask(void); 1887 1888 /* /sys/fs */ 1889 extern struct kobject *fs_kobj; 1890 1891 #define MAX_RW_COUNT (INT_MAX & PAGE_CACHE_MASK) 1892 extern int rw_verify_area(int, struct file *, loff_t *, size_t); 1893 1894 #define FLOCK_VERIFY_READ 1 1895 #define FLOCK_VERIFY_WRITE 2 1896 1897 #ifdef CONFIG_FILE_LOCKING 1898 extern int locks_mandatory_locked(struct inode *); 1899 extern int locks_mandatory_area(int, struct inode *, struct file *, loff_t, size_t); 1900 1901 /* 1902 * Candidates for mandatory locking have the setgid bit set 1903 * but no group execute bit - an otherwise meaningless combination. 1904 */ 1905 1906 static inline int __mandatory_lock(struct inode *ino) 1907 { 1908 return (ino->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID; 1909 } 1910 1911 /* 1912 * ... and these candidates should be on MS_MANDLOCK mounted fs, 1913 * otherwise these will be advisory locks 1914 */ 1915 1916 static inline int mandatory_lock(struct inode *ino) 1917 { 1918 return IS_MANDLOCK(ino) && __mandatory_lock(ino); 1919 } 1920 1921 static inline int locks_verify_locked(struct inode *inode) 1922 { 1923 if (mandatory_lock(inode)) 1924 return locks_mandatory_locked(inode); 1925 return 0; 1926 } 1927 1928 static inline int locks_verify_truncate(struct inode *inode, 1929 struct file *filp, 1930 loff_t size) 1931 { 1932 if (inode->i_flock && mandatory_lock(inode)) 1933 return locks_mandatory_area( 1934 FLOCK_VERIFY_WRITE, inode, filp, 1935 size < inode->i_size ? size : inode->i_size, 1936 (size < inode->i_size ? inode->i_size - size 1937 : size - inode->i_size) 1938 ); 1939 return 0; 1940 } 1941 1942 static inline int break_lease(struct inode *inode, unsigned int mode) 1943 { 1944 if (inode->i_flock) 1945 return __break_lease(inode, mode); 1946 return 0; 1947 } 1948 #else /* !CONFIG_FILE_LOCKING */ 1949 static inline int locks_mandatory_locked(struct inode *inode) 1950 { 1951 return 0; 1952 } 1953 1954 static inline int locks_mandatory_area(int rw, struct inode *inode, 1955 struct file *filp, loff_t offset, 1956 size_t count) 1957 { 1958 return 0; 1959 } 1960 1961 static inline int __mandatory_lock(struct inode *inode) 1962 { 1963 return 0; 1964 } 1965 1966 static inline int mandatory_lock(struct inode *inode) 1967 { 1968 return 0; 1969 } 1970 1971 static inline int locks_verify_locked(struct inode *inode) 1972 { 1973 return 0; 1974 } 1975 1976 static inline int locks_verify_truncate(struct inode *inode, struct file *filp, 1977 size_t size) 1978 { 1979 return 0; 1980 } 1981 1982 static inline int break_lease(struct inode *inode, unsigned int mode) 1983 { 1984 return 0; 1985 } 1986 1987 #endif /* CONFIG_FILE_LOCKING */ 1988 1989 /* fs/open.c */ 1990 1991 extern int do_truncate(struct dentry *, loff_t start, unsigned int time_attrs, 1992 struct file *filp); 1993 extern int do_fallocate(struct file *file, int mode, loff_t offset, 1994 loff_t len); 1995 extern long do_sys_open(int dfd, const char __user *filename, int flags, 1996 int mode); 1997 extern struct file *filp_open(const char *, int, int); 1998 extern struct file *file_open_root(struct dentry *, struct vfsmount *, 1999 const char *, int); 2000 extern struct file * dentry_open(struct dentry *, struct vfsmount *, int, 2001 const struct cred *); 2002 extern int filp_close(struct file *, fl_owner_t id); 2003 extern char * getname(const char __user *); 2004 2005 /* fs/ioctl.c */ 2006 2007 extern int ioctl_preallocate(struct file *filp, void __user *argp); 2008 2009 /* fs/dcache.c */ 2010 extern void __init vfs_caches_init_early(void); 2011 extern void __init vfs_caches_init(unsigned long); 2012 2013 extern struct kmem_cache *names_cachep; 2014 2015 #define __getname_gfp(gfp) kmem_cache_alloc(names_cachep, (gfp)) 2016 #define __getname() __getname_gfp(GFP_KERNEL) 2017 #define __putname(name) kmem_cache_free(names_cachep, (void *)(name)) 2018 #ifndef CONFIG_AUDITSYSCALL 2019 #define putname(name) __putname(name) 2020 #else 2021 extern void putname(const char *name); 2022 #endif 2023 2024 #ifdef CONFIG_BLOCK 2025 extern int register_blkdev(unsigned int, const char *); 2026 extern void unregister_blkdev(unsigned int, const char *); 2027 extern struct block_device *bdget(dev_t); 2028 extern struct block_device *bdgrab(struct block_device *bdev); 2029 extern void bd_set_size(struct block_device *, loff_t size); 2030 extern void bd_forget(struct inode *inode); 2031 extern void bdput(struct block_device *); 2032 extern void invalidate_bdev(struct block_device *); 2033 extern int sync_blockdev(struct block_device *bdev); 2034 extern struct super_block *freeze_bdev(struct block_device *); 2035 extern void emergency_thaw_all(void); 2036 extern int thaw_bdev(struct block_device *bdev, struct super_block *sb); 2037 extern int fsync_bdev(struct block_device *); 2038 #else 2039 static inline void bd_forget(struct inode *inode) {} 2040 static inline int sync_blockdev(struct block_device *bdev) { return 0; } 2041 static inline void invalidate_bdev(struct block_device *bdev) {} 2042 2043 static inline struct super_block *freeze_bdev(struct block_device *sb) 2044 { 2045 return NULL; 2046 } 2047 2048 static inline int thaw_bdev(struct block_device *bdev, struct super_block *sb) 2049 { 2050 return 0; 2051 } 2052 #endif 2053 extern int sync_filesystem(struct super_block *); 2054 extern const struct file_operations def_blk_fops; 2055 extern const struct file_operations def_chr_fops; 2056 extern const struct file_operations bad_sock_fops; 2057 extern const struct file_operations def_fifo_fops; 2058 #ifdef CONFIG_BLOCK 2059 extern int ioctl_by_bdev(struct block_device *, unsigned, unsigned long); 2060 extern int blkdev_ioctl(struct block_device *, fmode_t, unsigned, unsigned long); 2061 extern long compat_blkdev_ioctl(struct file *, unsigned, unsigned long); 2062 extern int blkdev_get(struct block_device *bdev, fmode_t mode, void *holder); 2063 extern struct block_device *blkdev_get_by_path(const char *path, fmode_t mode, 2064 void *holder); 2065 extern struct block_device *blkdev_get_by_dev(dev_t dev, fmode_t mode, 2066 void *holder); 2067 extern int blkdev_put(struct block_device *bdev, fmode_t mode); 2068 #ifdef CONFIG_SYSFS 2069 extern int bd_link_disk_holder(struct block_device *bdev, struct gendisk *disk); 2070 extern void bd_unlink_disk_holder(struct block_device *bdev, 2071 struct gendisk *disk); 2072 #else 2073 static inline int bd_link_disk_holder(struct block_device *bdev, 2074 struct gendisk *disk) 2075 { 2076 return 0; 2077 } 2078 static inline void bd_unlink_disk_holder(struct block_device *bdev, 2079 struct gendisk *disk) 2080 { 2081 } 2082 #endif 2083 #endif 2084 2085 /* fs/char_dev.c */ 2086 #define CHRDEV_MAJOR_HASH_SIZE 255 2087 extern int alloc_chrdev_region(dev_t *, unsigned, unsigned, const char *); 2088 extern int register_chrdev_region(dev_t, unsigned, const char *); 2089 extern int __register_chrdev(unsigned int major, unsigned int baseminor, 2090 unsigned int count, const char *name, 2091 const struct file_operations *fops); 2092 extern void __unregister_chrdev(unsigned int major, unsigned int baseminor, 2093 unsigned int count, const char *name); 2094 extern void unregister_chrdev_region(dev_t, unsigned); 2095 extern void chrdev_show(struct seq_file *,off_t); 2096 2097 static inline int register_chrdev(unsigned int major, const char *name, 2098 const struct file_operations *fops) 2099 { 2100 return __register_chrdev(major, 0, 256, name, fops); 2101 } 2102 2103 static inline void unregister_chrdev(unsigned int major, const char *name) 2104 { 2105 __unregister_chrdev(major, 0, 256, name); 2106 } 2107 2108 /* fs/block_dev.c */ 2109 #define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */ 2110 #define BDEVT_SIZE 10 /* Largest string for MAJ:MIN for blkdev */ 2111 2112 #ifdef CONFIG_BLOCK 2113 #define BLKDEV_MAJOR_HASH_SIZE 255 2114 extern const char *__bdevname(dev_t, char *buffer); 2115 extern const char *bdevname(struct block_device *bdev, char *buffer); 2116 extern struct block_device *lookup_bdev(const char *); 2117 extern void blkdev_show(struct seq_file *,off_t); 2118 2119 #else 2120 #define BLKDEV_MAJOR_HASH_SIZE 0 2121 #endif 2122 2123 extern void init_special_inode(struct inode *, umode_t, dev_t); 2124 2125 /* Invalid inode operations -- fs/bad_inode.c */ 2126 extern void make_bad_inode(struct inode *); 2127 extern int is_bad_inode(struct inode *); 2128 2129 extern const struct file_operations read_pipefifo_fops; 2130 extern const struct file_operations write_pipefifo_fops; 2131 extern const struct file_operations rdwr_pipefifo_fops; 2132 2133 extern int fs_may_remount_ro(struct super_block *); 2134 2135 #ifdef CONFIG_BLOCK 2136 /* 2137 * return READ, READA, or WRITE 2138 */ 2139 #define bio_rw(bio) ((bio)->bi_rw & (RW_MASK | RWA_MASK)) 2140 2141 /* 2142 * return data direction, READ or WRITE 2143 */ 2144 #define bio_data_dir(bio) ((bio)->bi_rw & 1) 2145 2146 extern void check_disk_size_change(struct gendisk *disk, 2147 struct block_device *bdev); 2148 extern int revalidate_disk(struct gendisk *); 2149 extern int check_disk_change(struct block_device *); 2150 extern int __invalidate_device(struct block_device *, bool); 2151 extern int invalidate_partition(struct gendisk *, int); 2152 #endif 2153 unsigned long invalidate_mapping_pages(struct address_space *mapping, 2154 pgoff_t start, pgoff_t end); 2155 2156 static inline void invalidate_remote_inode(struct inode *inode) 2157 { 2158 if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || 2159 S_ISLNK(inode->i_mode)) 2160 invalidate_mapping_pages(inode->i_mapping, 0, -1); 2161 } 2162 extern int invalidate_inode_pages2(struct address_space *mapping); 2163 extern int invalidate_inode_pages2_range(struct address_space *mapping, 2164 pgoff_t start, pgoff_t end); 2165 extern int write_inode_now(struct inode *, int); 2166 extern int filemap_fdatawrite(struct address_space *); 2167 extern int filemap_flush(struct address_space *); 2168 extern int filemap_fdatawait(struct address_space *); 2169 extern int filemap_fdatawait_range(struct address_space *, loff_t lstart, 2170 loff_t lend); 2171 extern int filemap_write_and_wait(struct address_space *mapping); 2172 extern int filemap_write_and_wait_range(struct address_space *mapping, 2173 loff_t lstart, loff_t lend); 2174 extern int __filemap_fdatawrite_range(struct address_space *mapping, 2175 loff_t start, loff_t end, int sync_mode); 2176 extern int filemap_fdatawrite_range(struct address_space *mapping, 2177 loff_t start, loff_t end); 2178 2179 extern int vfs_fsync_range(struct file *file, loff_t start, loff_t end, 2180 int datasync); 2181 extern int vfs_fsync(struct file *file, int datasync); 2182 extern int generic_write_sync(struct file *file, loff_t pos, loff_t count); 2183 extern void sync_supers(void); 2184 extern void emergency_sync(void); 2185 extern void emergency_remount(void); 2186 #ifdef CONFIG_BLOCK 2187 extern sector_t bmap(struct inode *, sector_t); 2188 #endif 2189 extern int notify_change(struct dentry *, struct iattr *); 2190 extern int inode_permission(struct inode *, int); 2191 extern int generic_permission(struct inode *, int, unsigned int, 2192 int (*check_acl)(struct inode *, int, unsigned int)); 2193 2194 static inline bool execute_ok(struct inode *inode) 2195 { 2196 return (inode->i_mode & S_IXUGO) || S_ISDIR(inode->i_mode); 2197 } 2198 2199 extern int get_write_access(struct inode *); 2200 extern int deny_write_access(struct file *); 2201 static inline void put_write_access(struct inode * inode) 2202 { 2203 atomic_dec(&inode->i_writecount); 2204 } 2205 static inline void allow_write_access(struct file *file) 2206 { 2207 if (file) 2208 atomic_inc(&file->f_path.dentry->d_inode->i_writecount); 2209 } 2210 #ifdef CONFIG_IMA 2211 static inline void i_readcount_dec(struct inode *inode) 2212 { 2213 BUG_ON(!atomic_read(&inode->i_readcount)); 2214 atomic_dec(&inode->i_readcount); 2215 } 2216 static inline void i_readcount_inc(struct inode *inode) 2217 { 2218 atomic_inc(&inode->i_readcount); 2219 } 2220 #else 2221 static inline void i_readcount_dec(struct inode *inode) 2222 { 2223 return; 2224 } 2225 static inline void i_readcount_inc(struct inode *inode) 2226 { 2227 return; 2228 } 2229 #endif 2230 extern int do_pipe_flags(int *, int); 2231 extern struct file *create_read_pipe(struct file *f, int flags); 2232 extern struct file *create_write_pipe(int flags); 2233 extern void free_write_pipe(struct file *); 2234 2235 extern int kernel_read(struct file *, loff_t, char *, unsigned long); 2236 extern struct file * open_exec(const char *); 2237 2238 /* fs/dcache.c -- generic fs support functions */ 2239 extern int is_subdir(struct dentry *, struct dentry *); 2240 extern int path_is_under(struct path *, struct path *); 2241 extern ino_t find_inode_number(struct dentry *, struct qstr *); 2242 2243 #include <linux/err.h> 2244 2245 /* needed for stackable file system support */ 2246 extern loff_t default_llseek(struct file *file, loff_t offset, int origin); 2247 2248 extern loff_t vfs_llseek(struct file *file, loff_t offset, int origin); 2249 2250 extern int inode_init_always(struct super_block *, struct inode *); 2251 extern void inode_init_once(struct inode *); 2252 extern void address_space_init_once(struct address_space *mapping); 2253 extern void ihold(struct inode * inode); 2254 extern void iput(struct inode *); 2255 extern struct inode * igrab(struct inode *); 2256 extern ino_t iunique(struct super_block *, ino_t); 2257 extern int inode_needs_sync(struct inode *inode); 2258 extern int generic_delete_inode(struct inode *inode); 2259 extern int generic_drop_inode(struct inode *inode); 2260 2261 extern struct inode *ilookup5_nowait(struct super_block *sb, 2262 unsigned long hashval, int (*test)(struct inode *, void *), 2263 void *data); 2264 extern struct inode *ilookup5(struct super_block *sb, unsigned long hashval, 2265 int (*test)(struct inode *, void *), void *data); 2266 extern struct inode *ilookup(struct super_block *sb, unsigned long ino); 2267 2268 extern struct inode * iget5_locked(struct super_block *, unsigned long, int (*test)(struct inode *, void *), int (*set)(struct inode *, void *), void *); 2269 extern struct inode * iget_locked(struct super_block *, unsigned long); 2270 extern int insert_inode_locked4(struct inode *, unsigned long, int (*test)(struct inode *, void *), void *); 2271 extern int insert_inode_locked(struct inode *); 2272 extern void unlock_new_inode(struct inode *); 2273 extern unsigned int get_next_ino(void); 2274 2275 extern void __iget(struct inode * inode); 2276 extern void iget_failed(struct inode *); 2277 extern void end_writeback(struct inode *); 2278 extern void __destroy_inode(struct inode *); 2279 extern struct inode *new_inode(struct super_block *); 2280 extern void free_inode_nonrcu(struct inode *inode); 2281 extern int should_remove_suid(struct dentry *); 2282 extern int file_remove_suid(struct file *); 2283 2284 extern void __insert_inode_hash(struct inode *, unsigned long hashval); 2285 extern void remove_inode_hash(struct inode *); 2286 static inline void insert_inode_hash(struct inode *inode) 2287 { 2288 __insert_inode_hash(inode, inode->i_ino); 2289 } 2290 extern void inode_sb_list_add(struct inode *inode); 2291 2292 #ifdef CONFIG_BLOCK 2293 extern void submit_bio(int, struct bio *); 2294 extern int bdev_read_only(struct block_device *); 2295 #endif 2296 extern int set_blocksize(struct block_device *, int); 2297 extern int sb_set_blocksize(struct super_block *, int); 2298 extern int sb_min_blocksize(struct super_block *, int); 2299 2300 extern int generic_file_mmap(struct file *, struct vm_area_struct *); 2301 extern int generic_file_readonly_mmap(struct file *, struct vm_area_struct *); 2302 extern int file_read_actor(read_descriptor_t * desc, struct page *page, unsigned long offset, unsigned long size); 2303 int generic_write_checks(struct file *file, loff_t *pos, size_t *count, int isblk); 2304 extern ssize_t generic_file_aio_read(struct kiocb *, const struct iovec *, unsigned long, loff_t); 2305 extern ssize_t __generic_file_aio_write(struct kiocb *, const struct iovec *, unsigned long, 2306 loff_t *); 2307 extern ssize_t generic_file_aio_write(struct kiocb *, const struct iovec *, unsigned long, loff_t); 2308 extern ssize_t generic_file_direct_write(struct kiocb *, const struct iovec *, 2309 unsigned long *, loff_t, loff_t *, size_t, size_t); 2310 extern ssize_t generic_file_buffered_write(struct kiocb *, const struct iovec *, 2311 unsigned long, loff_t, loff_t *, size_t, ssize_t); 2312 extern ssize_t do_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos); 2313 extern ssize_t do_sync_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos); 2314 extern int generic_segment_checks(const struct iovec *iov, 2315 unsigned long *nr_segs, size_t *count, int access_flags); 2316 2317 /* fs/block_dev.c */ 2318 extern ssize_t blkdev_aio_write(struct kiocb *iocb, const struct iovec *iov, 2319 unsigned long nr_segs, loff_t pos); 2320 extern int blkdev_fsync(struct file *filp, int datasync); 2321 2322 /* fs/splice.c */ 2323 extern ssize_t generic_file_splice_read(struct file *, loff_t *, 2324 struct pipe_inode_info *, size_t, unsigned int); 2325 extern ssize_t default_file_splice_read(struct file *, loff_t *, 2326 struct pipe_inode_info *, size_t, unsigned int); 2327 extern ssize_t generic_file_splice_write(struct pipe_inode_info *, 2328 struct file *, loff_t *, size_t, unsigned int); 2329 extern ssize_t generic_splice_sendpage(struct pipe_inode_info *pipe, 2330 struct file *out, loff_t *, size_t len, unsigned int flags); 2331 extern long do_splice_direct(struct file *in, loff_t *ppos, struct file *out, 2332 size_t len, unsigned int flags); 2333 2334 extern void 2335 file_ra_state_init(struct file_ra_state *ra, struct address_space *mapping); 2336 extern loff_t noop_llseek(struct file *file, loff_t offset, int origin); 2337 extern loff_t no_llseek(struct file *file, loff_t offset, int origin); 2338 extern loff_t generic_file_llseek(struct file *file, loff_t offset, int origin); 2339 extern loff_t generic_file_llseek_unlocked(struct file *file, loff_t offset, 2340 int origin); 2341 extern int generic_file_open(struct inode * inode, struct file * filp); 2342 extern int nonseekable_open(struct inode * inode, struct file * filp); 2343 2344 #ifdef CONFIG_FS_XIP 2345 extern ssize_t xip_file_read(struct file *filp, char __user *buf, size_t len, 2346 loff_t *ppos); 2347 extern int xip_file_mmap(struct file * file, struct vm_area_struct * vma); 2348 extern ssize_t xip_file_write(struct file *filp, const char __user *buf, 2349 size_t len, loff_t *ppos); 2350 extern int xip_truncate_page(struct address_space *mapping, loff_t from); 2351 #else 2352 static inline int xip_truncate_page(struct address_space *mapping, loff_t from) 2353 { 2354 return 0; 2355 } 2356 #endif 2357 2358 #ifdef CONFIG_BLOCK 2359 typedef void (dio_submit_t)(int rw, struct bio *bio, struct inode *inode, 2360 loff_t file_offset); 2361 2362 enum { 2363 /* need locking between buffered and direct access */ 2364 DIO_LOCKING = 0x01, 2365 2366 /* filesystem does not support filling holes */ 2367 DIO_SKIP_HOLES = 0x02, 2368 }; 2369 2370 void dio_end_io(struct bio *bio, int error); 2371 2372 ssize_t __blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode, 2373 struct block_device *bdev, const struct iovec *iov, loff_t offset, 2374 unsigned long nr_segs, get_block_t get_block, dio_iodone_t end_io, 2375 dio_submit_t submit_io, int flags); 2376 2377 static inline ssize_t blockdev_direct_IO(int rw, struct kiocb *iocb, 2378 struct inode *inode, struct block_device *bdev, const struct iovec *iov, 2379 loff_t offset, unsigned long nr_segs, get_block_t get_block, 2380 dio_iodone_t end_io) 2381 { 2382 return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset, 2383 nr_segs, get_block, end_io, NULL, 2384 DIO_LOCKING | DIO_SKIP_HOLES); 2385 } 2386 #endif 2387 2388 extern const struct file_operations generic_ro_fops; 2389 2390 #define special_file(m) (S_ISCHR(m)||S_ISBLK(m)||S_ISFIFO(m)||S_ISSOCK(m)) 2391 2392 extern int vfs_readlink(struct dentry *, char __user *, int, const char *); 2393 extern int vfs_follow_link(struct nameidata *, const char *); 2394 extern int page_readlink(struct dentry *, char __user *, int); 2395 extern void *page_follow_link_light(struct dentry *, struct nameidata *); 2396 extern void page_put_link(struct dentry *, struct nameidata *, void *); 2397 extern int __page_symlink(struct inode *inode, const char *symname, int len, 2398 int nofs); 2399 extern int page_symlink(struct inode *inode, const char *symname, int len); 2400 extern const struct inode_operations page_symlink_inode_operations; 2401 extern int generic_readlink(struct dentry *, char __user *, int); 2402 extern void generic_fillattr(struct inode *, struct kstat *); 2403 extern int vfs_getattr(struct vfsmount *, struct dentry *, struct kstat *); 2404 void __inode_add_bytes(struct inode *inode, loff_t bytes); 2405 void inode_add_bytes(struct inode *inode, loff_t bytes); 2406 void inode_sub_bytes(struct inode *inode, loff_t bytes); 2407 loff_t inode_get_bytes(struct inode *inode); 2408 void inode_set_bytes(struct inode *inode, loff_t bytes); 2409 2410 extern int vfs_readdir(struct file *, filldir_t, void *); 2411 2412 extern int vfs_stat(const char __user *, struct kstat *); 2413 extern int vfs_lstat(const char __user *, struct kstat *); 2414 extern int vfs_fstat(unsigned int, struct kstat *); 2415 extern int vfs_fstatat(int , const char __user *, struct kstat *, int); 2416 2417 extern int do_vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd, 2418 unsigned long arg); 2419 extern int __generic_block_fiemap(struct inode *inode, 2420 struct fiemap_extent_info *fieinfo, 2421 loff_t start, loff_t len, 2422 get_block_t *get_block); 2423 extern int generic_block_fiemap(struct inode *inode, 2424 struct fiemap_extent_info *fieinfo, u64 start, 2425 u64 len, get_block_t *get_block); 2426 2427 extern void get_filesystem(struct file_system_type *fs); 2428 extern void put_filesystem(struct file_system_type *fs); 2429 extern struct file_system_type *get_fs_type(const char *name); 2430 extern struct super_block *get_super(struct block_device *); 2431 extern struct super_block *get_active_super(struct block_device *bdev); 2432 extern struct super_block *user_get_super(dev_t); 2433 extern void drop_super(struct super_block *sb); 2434 extern void iterate_supers(void (*)(struct super_block *, void *), void *); 2435 2436 extern int dcache_dir_open(struct inode *, struct file *); 2437 extern int dcache_dir_close(struct inode *, struct file *); 2438 extern loff_t dcache_dir_lseek(struct file *, loff_t, int); 2439 extern int dcache_readdir(struct file *, void *, filldir_t); 2440 extern int simple_setattr(struct dentry *, struct iattr *); 2441 extern int simple_getattr(struct vfsmount *, struct dentry *, struct kstat *); 2442 extern int simple_statfs(struct dentry *, struct kstatfs *); 2443 extern int simple_link(struct dentry *, struct inode *, struct dentry *); 2444 extern int simple_unlink(struct inode *, struct dentry *); 2445 extern int simple_rmdir(struct inode *, struct dentry *); 2446 extern int simple_rename(struct inode *, struct dentry *, struct inode *, struct dentry *); 2447 extern int noop_fsync(struct file *, int); 2448 extern int simple_empty(struct dentry *); 2449 extern int simple_readpage(struct file *file, struct page *page); 2450 extern int simple_write_begin(struct file *file, struct address_space *mapping, 2451 loff_t pos, unsigned len, unsigned flags, 2452 struct page **pagep, void **fsdata); 2453 extern int simple_write_end(struct file *file, struct address_space *mapping, 2454 loff_t pos, unsigned len, unsigned copied, 2455 struct page *page, void *fsdata); 2456 2457 extern struct dentry *simple_lookup(struct inode *, struct dentry *, struct nameidata *); 2458 extern ssize_t generic_read_dir(struct file *, char __user *, size_t, loff_t *); 2459 extern const struct file_operations simple_dir_operations; 2460 extern const struct inode_operations simple_dir_inode_operations; 2461 struct tree_descr { char *name; const struct file_operations *ops; int mode; }; 2462 struct dentry *d_alloc_name(struct dentry *, const char *); 2463 extern int simple_fill_super(struct super_block *, unsigned long, struct tree_descr *); 2464 extern int simple_pin_fs(struct file_system_type *, struct vfsmount **mount, int *count); 2465 extern void simple_release_fs(struct vfsmount **mount, int *count); 2466 2467 extern ssize_t simple_read_from_buffer(void __user *to, size_t count, 2468 loff_t *ppos, const void *from, size_t available); 2469 extern ssize_t simple_write_to_buffer(void *to, size_t available, loff_t *ppos, 2470 const void __user *from, size_t count); 2471 2472 extern int generic_file_fsync(struct file *, int); 2473 2474 extern int generic_check_addressable(unsigned, u64); 2475 2476 #ifdef CONFIG_MIGRATION 2477 extern int buffer_migrate_page(struct address_space *, 2478 struct page *, struct page *); 2479 #else 2480 #define buffer_migrate_page NULL 2481 #endif 2482 2483 extern int inode_change_ok(const struct inode *, struct iattr *); 2484 extern int inode_newsize_ok(const struct inode *, loff_t offset); 2485 extern void setattr_copy(struct inode *inode, const struct iattr *attr); 2486 2487 extern void file_update_time(struct file *file); 2488 2489 extern int generic_show_options(struct seq_file *m, struct vfsmount *mnt); 2490 extern void save_mount_options(struct super_block *sb, char *options); 2491 extern void replace_mount_options(struct super_block *sb, char *options); 2492 2493 static inline ino_t parent_ino(struct dentry *dentry) 2494 { 2495 ino_t res; 2496 2497 /* 2498 * Don't strictly need d_lock here? If the parent ino could change 2499 * then surely we'd have a deeper race in the caller? 2500 */ 2501 spin_lock(&dentry->d_lock); 2502 res = dentry->d_parent->d_inode->i_ino; 2503 spin_unlock(&dentry->d_lock); 2504 return res; 2505 } 2506 2507 /* Transaction based IO helpers */ 2508 2509 /* 2510 * An argresp is stored in an allocated page and holds the 2511 * size of the argument or response, along with its content 2512 */ 2513 struct simple_transaction_argresp { 2514 ssize_t size; 2515 char data[0]; 2516 }; 2517 2518 #define SIMPLE_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct simple_transaction_argresp)) 2519 2520 char *simple_transaction_get(struct file *file, const char __user *buf, 2521 size_t size); 2522 ssize_t simple_transaction_read(struct file *file, char __user *buf, 2523 size_t size, loff_t *pos); 2524 int simple_transaction_release(struct inode *inode, struct file *file); 2525 2526 void simple_transaction_set(struct file *file, size_t n); 2527 2528 /* 2529 * simple attribute files 2530 * 2531 * These attributes behave similar to those in sysfs: 2532 * 2533 * Writing to an attribute immediately sets a value, an open file can be 2534 * written to multiple times. 2535 * 2536 * Reading from an attribute creates a buffer from the value that might get 2537 * read with multiple read calls. When the attribute has been read 2538 * completely, no further read calls are possible until the file is opened 2539 * again. 2540 * 2541 * All attributes contain a text representation of a numeric value 2542 * that are accessed with the get() and set() functions. 2543 */ 2544 #define DEFINE_SIMPLE_ATTRIBUTE(__fops, __get, __set, __fmt) \ 2545 static int __fops ## _open(struct inode *inode, struct file *file) \ 2546 { \ 2547 __simple_attr_check_format(__fmt, 0ull); \ 2548 return simple_attr_open(inode, file, __get, __set, __fmt); \ 2549 } \ 2550 static const struct file_operations __fops = { \ 2551 .owner = THIS_MODULE, \ 2552 .open = __fops ## _open, \ 2553 .release = simple_attr_release, \ 2554 .read = simple_attr_read, \ 2555 .write = simple_attr_write, \ 2556 .llseek = generic_file_llseek, \ 2557 }; 2558 2559 static inline void __attribute__((format(printf, 1, 2))) 2560 __simple_attr_check_format(const char *fmt, ...) 2561 { 2562 /* don't do anything, just let the compiler check the arguments; */ 2563 } 2564 2565 int simple_attr_open(struct inode *inode, struct file *file, 2566 int (*get)(void *, u64 *), int (*set)(void *, u64), 2567 const char *fmt); 2568 int simple_attr_release(struct inode *inode, struct file *file); 2569 ssize_t simple_attr_read(struct file *file, char __user *buf, 2570 size_t len, loff_t *ppos); 2571 ssize_t simple_attr_write(struct file *file, const char __user *buf, 2572 size_t len, loff_t *ppos); 2573 2574 struct ctl_table; 2575 int proc_nr_files(struct ctl_table *table, int write, 2576 void __user *buffer, size_t *lenp, loff_t *ppos); 2577 int proc_nr_dentry(struct ctl_table *table, int write, 2578 void __user *buffer, size_t *lenp, loff_t *ppos); 2579 int proc_nr_inodes(struct ctl_table *table, int write, 2580 void __user *buffer, size_t *lenp, loff_t *ppos); 2581 int __init get_filesystem_list(char *buf); 2582 2583 #define __FMODE_EXEC ((__force int) FMODE_EXEC) 2584 #define __FMODE_NONOTIFY ((__force int) FMODE_NONOTIFY) 2585 2586 #define ACC_MODE(x) ("\004\002\006\006"[(x)&O_ACCMODE]) 2587 #define OPEN_FMODE(flag) ((__force fmode_t)(((flag + 1) & O_ACCMODE) | \ 2588 (flag & __FMODE_NONOTIFY))) 2589 2590 static inline int is_sxid(mode_t mode) 2591 { 2592 return (mode & S_ISUID) || ((mode & S_ISGID) && (mode & S_IXGRP)); 2593 } 2594 2595 static inline void inode_has_no_xattr(struct inode *inode) 2596 { 2597 if (!is_sxid(inode->i_mode) && (inode->i_sb->s_flags & MS_NOSEC)) 2598 inode->i_flags |= S_NOSEC; 2599 } 2600 2601 #endif /* __KERNEL__ */ 2602 #endif /* _LINUX_FS_H */

Here is the explanation of the rule violation arisen in your driver for the corresponding kernel.

Note that there may be no error indeed. Please see on error trace and source code to understand whether there is an error in your driver.

The Error trace column contains the path on which rule is violated. You can choose some entity classes to be shown or hiden by clicking on the corresponding checkboxes or in the advanced Others menu. Also you can show or hide each particular entity by clicking on the corresponding - or +. In hovering on some entities you can see their descriptions and meaning. Also the error trace is binded with the source code. Line numbers are shown as links on the left. You can click on them to open the corresponding line in source code. Line numbers and file names are shown in entity descriptions.

The Source code column contains content of files related with the error trace. There are your driver (note that there are some our modifications at the end), kernel headers and rule source code. Tabs show the currently opened file and other available files. In hovering you can see file names in titles. On clicking the corresponding file content will be shown.

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