Lines Matching full:file
12 #include <linux/file.h>
37 static inline bool unsigned_offsets(struct file *file) in unsigned_offsets() argument
39 return file->f_mode & FMODE_UNSIGNED_OFFSET; in unsigned_offsets()
43 * vfs_setpos - update the file offset for lseek
44 * @file: file structure in question
45 * @offset: file offset to seek to
46 * @maxsize: maximum file size
48 * This is a low-level filesystem helper for updating the file offset to
50 * not equal to the current file offset.
54 loff_t vfs_setpos(struct file *file, loff_t offset, loff_t maxsize) in vfs_setpos() argument
56 if (offset < 0 && !unsigned_offsets(file)) in vfs_setpos()
61 if (offset != file->f_pos) { in vfs_setpos()
62 file->f_pos = offset; in vfs_setpos()
63 file->f_version = 0; in vfs_setpos()
71 * @file: file structure to seek on
72 * @offset: file offset to seek to
74 * @size: max size of this file in file system
78 * maximum file size and a custom EOF position, for e.g. hashed directories
86 generic_file_llseek_size(struct file *file, loff_t offset, int whence, in generic_file_llseek_size() argument
97 * f_pos value back to the file because a concurrent read(), in generic_file_llseek_size()
101 return file->f_pos; in generic_file_llseek_size()
107 spin_lock(&file->f_lock); in generic_file_llseek_size()
108 offset = vfs_setpos(file, file->f_pos + offset, maxsize); in generic_file_llseek_size()
109 spin_unlock(&file->f_lock); in generic_file_llseek_size()
113 * In the generic case the entire file is data, so as long as in generic_file_llseek_size()
114 * offset isn't at the end of the file then the offset is data. in generic_file_llseek_size()
121 * There is a virtual hole at the end of the file, so as long as in generic_file_llseek_size()
130 return vfs_setpos(file, offset, maxsize); in generic_file_llseek_size()
136 * @file: file structure to seek on
137 * @offset: file offset to seek to
141 * filesystems. It just updates the file offset to the value specified by
144 loff_t generic_file_llseek(struct file *file, loff_t offset, int whence) in generic_file_llseek() argument
146 struct inode *inode = file->f_mapping->host; in generic_file_llseek()
148 return generic_file_llseek_size(file, offset, whence, in generic_file_llseek()
156 * @file: file structure to seek on
157 * @offset: file offset to seek to
159 * @size: size of the file
162 loff_t fixed_size_llseek(struct file *file, loff_t offset, int whence, loff_t size) in fixed_size_llseek() argument
166 return generic_file_llseek_size(file, offset, whence, in fixed_size_llseek()
176 * @file: file structure to seek on
177 * @offset: file offset to seek to
181 loff_t no_seek_end_llseek(struct file *file, loff_t offset, int whence) in no_seek_end_llseek() argument
185 return generic_file_llseek_size(file, offset, whence, in no_seek_end_llseek()
195 * @file: file structure to seek on
196 * @offset: file offset to seek to
201 loff_t no_seek_end_llseek_size(struct file *file, loff_t offset, int whence, loff_t size) in no_seek_end_llseek_size() argument
205 return generic_file_llseek_size(file, offset, whence, in no_seek_end_llseek_size()
215 * @file: file structure to seek on
216 * @offset: file offset to seek to
220 * userspace expects the seek to succeed but the (device) file is actually not
224 loff_t noop_llseek(struct file *file, loff_t offset, int whence) in noop_llseek() argument
226 return file->f_pos; in noop_llseek()
230 loff_t no_llseek(struct file *file, loff_t offset, int whence) in no_llseek() argument
236 loff_t default_llseek(struct file *file, loff_t offset, int whence) in default_llseek() argument
238 struct inode *inode = file_inode(file); in default_llseek()
248 retval = file->f_pos; in default_llseek()
251 offset += file->f_pos; in default_llseek()
255 * In the generic case the entire file is data, so as in default_llseek()
256 * long as offset isn't at the end of the file then the in default_llseek()
266 * There is a virtual hole at the end of the file, so in default_llseek()
278 if (offset >= 0 || unsigned_offsets(file)) { in default_llseek()
279 if (offset != file->f_pos) { in default_llseek()
280 file->f_pos = offset; in default_llseek()
281 file->f_version = 0; in default_llseek()
291 loff_t vfs_llseek(struct file *file, loff_t offset, int whence) in vfs_llseek() argument
293 loff_t (*fn)(struct file *, loff_t, int); in vfs_llseek()
296 if (file->f_mode & FMODE_LSEEK) { in vfs_llseek()
297 if (file->f_op->llseek) in vfs_llseek()
298 fn = file->f_op->llseek; in vfs_llseek()
300 return fn(file, offset, whence); in vfs_llseek()
308 if (!f.file) in ksys_lseek()
313 loff_t res = vfs_llseek(f.file, offset, whence); in ksys_lseek()
344 if (!f.file) in SYSCALL_DEFINE5()
351 offset = vfs_llseek(f.file, ((loff_t) offset_high << 32) | offset_low, in SYSCALL_DEFINE5()
366 int rw_verify_area(int read_write, struct file *file, const loff_t *ppos, size_t count) in rw_verify_area() argument
379 if (!unsigned_offsets(file)) in rw_verify_area()
384 if (!unsigned_offsets(file)) in rw_verify_area()
389 return security_file_permission(file, in rw_verify_area()
393 static ssize_t new_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos) in new_sync_read()
411 static int warn_unsupported(struct file *file, const char *op) in warn_unsupported() argument
414 "kernel %s not supported for file %pD4 (pid: %d comm: %.20s)\n", in warn_unsupported()
415 op, file, current->pid, current->comm); in warn_unsupported()
419 ssize_t __kernel_read(struct file *file, void *buf, size_t count, loff_t *pos) in __kernel_read() argument
429 if (WARN_ON_ONCE(!(file->f_mode & FMODE_READ))) in __kernel_read()
431 if (!(file->f_mode & FMODE_CAN_READ)) in __kernel_read()
437 if (unlikely(!file->f_op->read_iter || file->f_op->read)) in __kernel_read()
438 return warn_unsupported(file, "read"); in __kernel_read()
440 init_sync_kiocb(&kiocb, file); in __kernel_read()
443 ret = file->f_op->read_iter(&kiocb, &iter); in __kernel_read()
447 fsnotify_access(file); in __kernel_read()
454 ssize_t kernel_read(struct file *file, void *buf, size_t count, loff_t *pos) in kernel_read() argument
458 ret = rw_verify_area(READ, file, pos, count); in kernel_read()
461 return __kernel_read(file, buf, count, pos); in kernel_read()
465 ssize_t vfs_read(struct file *file, char __user *buf, size_t count, loff_t *pos) in vfs_read() argument
469 if (!(file->f_mode & FMODE_READ)) in vfs_read()
471 if (!(file->f_mode & FMODE_CAN_READ)) in vfs_read()
476 ret = rw_verify_area(READ, file, pos, count); in vfs_read()
482 if (file->f_op->read) in vfs_read()
483 ret = file->f_op->read(file, buf, count, pos); in vfs_read()
484 else if (file->f_op->read_iter) in vfs_read()
485 ret = new_sync_read(file, buf, count, pos); in vfs_read()
489 fsnotify_access(file); in vfs_read()
496 static ssize_t new_sync_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos) in new_sync_write()
515 ssize_t __kernel_write(struct file *file, const void *buf, size_t count, loff_t *pos) in __kernel_write() argument
525 if (WARN_ON_ONCE(!(file->f_mode & FMODE_WRITE))) in __kernel_write()
527 if (!(file->f_mode & FMODE_CAN_WRITE)) in __kernel_write()
533 if (unlikely(!file->f_op->write_iter || file->f_op->write)) in __kernel_write()
534 return warn_unsupported(file, "write"); in __kernel_write()
536 init_sync_kiocb(&kiocb, file); in __kernel_write()
539 ret = file->f_op->write_iter(&kiocb, &iter); in __kernel_write()
543 fsnotify_modify(file); in __kernel_write()
558 ssize_t kernel_write(struct file *file, const void *buf, size_t count, in kernel_write() argument
563 ret = rw_verify_area(WRITE, file, pos, count); in kernel_write()
567 file_start_write(file); in kernel_write()
568 ret = __kernel_write(file, buf, count, pos); in kernel_write()
569 file_end_write(file); in kernel_write()
574 ssize_t vfs_write(struct file *file, const char __user *buf, size_t count, loff_t *pos) in vfs_write() argument
578 if (!(file->f_mode & FMODE_WRITE)) in vfs_write()
580 if (!(file->f_mode & FMODE_CAN_WRITE)) in vfs_write()
585 ret = rw_verify_area(WRITE, file, pos, count); in vfs_write()
590 file_start_write(file); in vfs_write()
591 if (file->f_op->write) in vfs_write()
592 ret = file->f_op->write(file, buf, count, pos); in vfs_write()
593 else if (file->f_op->write_iter) in vfs_write()
594 ret = new_sync_write(file, buf, count, pos); in vfs_write()
598 fsnotify_modify(file); in vfs_write()
602 file_end_write(file); in vfs_write()
606 /* file_ppos returns &file->f_pos or NULL if file is stream */
607 static inline loff_t *file_ppos(struct file *file) in file_ppos() argument
609 return file->f_mode & FMODE_STREAM ? NULL : &file->f_pos; in file_ppos()
617 if (f.file) { in ksys_read()
618 loff_t pos, *ppos = file_ppos(f.file); in ksys_read()
623 ret = vfs_read(f.file, buf, count, ppos); in ksys_read()
625 f.file->f_pos = pos; in ksys_read()
641 if (f.file) { in ksys_write()
642 loff_t pos, *ppos = file_ppos(f.file); in ksys_write()
647 ret = vfs_write(f.file, buf, count, ppos); in ksys_write()
649 f.file->f_pos = pos; in ksys_write()
672 if (f.file) { in ksys_pread64()
674 if (f.file->f_mode & FMODE_PREAD) in ksys_pread64()
675 ret = vfs_read(f.file, buf, count, &pos); in ksys_pread64()
698 if (f.file) { in ksys_pwrite64()
700 if (f.file->f_mode & FMODE_PWRITE) in ksys_pwrite64()
701 ret = vfs_write(f.file, buf, count, &pos); in ksys_pwrite64()
714 static ssize_t do_iter_readv_writev(struct file *filp, struct iov_iter *iter, in do_iter_readv_writev()
736 /* Do it by hand, with file-ops */
737 static ssize_t do_loop_readv_writev(struct file *filp, struct iov_iter *iter, in do_loop_readv_writev()
771 static ssize_t do_iter_read(struct file *file, struct iov_iter *iter, in do_iter_read() argument
777 if (!(file->f_mode & FMODE_READ)) in do_iter_read()
779 if (!(file->f_mode & FMODE_CAN_READ)) in do_iter_read()
785 ret = rw_verify_area(READ, file, pos, tot_len); in do_iter_read()
789 if (file->f_op->read_iter) in do_iter_read()
790 ret = do_iter_readv_writev(file, iter, pos, READ, flags); in do_iter_read()
792 ret = do_loop_readv_writev(file, iter, pos, READ, flags); in do_iter_read()
795 fsnotify_access(file); in do_iter_read()
799 ssize_t vfs_iocb_iter_read(struct file *file, struct kiocb *iocb, in vfs_iocb_iter_read() argument
805 if (!file->f_op->read_iter) in vfs_iocb_iter_read()
807 if (!(file->f_mode & FMODE_READ)) in vfs_iocb_iter_read()
809 if (!(file->f_mode & FMODE_CAN_READ)) in vfs_iocb_iter_read()
815 ret = rw_verify_area(READ, file, &iocb->ki_pos, tot_len); in vfs_iocb_iter_read()
819 ret = call_read_iter(file, iocb, iter); in vfs_iocb_iter_read()
822 fsnotify_access(file); in vfs_iocb_iter_read()
827 ssize_t vfs_iter_read(struct file *file, struct iov_iter *iter, loff_t *ppos, in vfs_iter_read() argument
830 if (!file->f_op->read_iter) in vfs_iter_read()
832 return do_iter_read(file, iter, ppos, flags); in vfs_iter_read()
836 static ssize_t do_iter_write(struct file *file, struct iov_iter *iter, in do_iter_write() argument
842 if (!(file->f_mode & FMODE_WRITE)) in do_iter_write()
844 if (!(file->f_mode & FMODE_CAN_WRITE)) in do_iter_write()
850 ret = rw_verify_area(WRITE, file, pos, tot_len); in do_iter_write()
854 if (file->f_op->write_iter) in do_iter_write()
855 ret = do_iter_readv_writev(file, iter, pos, WRITE, flags); in do_iter_write()
857 ret = do_loop_readv_writev(file, iter, pos, WRITE, flags); in do_iter_write()
859 fsnotify_modify(file); in do_iter_write()
863 ssize_t vfs_iocb_iter_write(struct file *file, struct kiocb *iocb, in vfs_iocb_iter_write() argument
869 if (!file->f_op->write_iter) in vfs_iocb_iter_write()
871 if (!(file->f_mode & FMODE_WRITE)) in vfs_iocb_iter_write()
873 if (!(file->f_mode & FMODE_CAN_WRITE)) in vfs_iocb_iter_write()
879 ret = rw_verify_area(WRITE, file, &iocb->ki_pos, tot_len); in vfs_iocb_iter_write()
883 ret = call_write_iter(file, iocb, iter); in vfs_iocb_iter_write()
885 fsnotify_modify(file); in vfs_iocb_iter_write()
891 ssize_t vfs_iter_write(struct file *file, struct iov_iter *iter, loff_t *ppos, in vfs_iter_write() argument
894 if (!file->f_op->write_iter) in vfs_iter_write()
896 return do_iter_write(file, iter, ppos, flags); in vfs_iter_write()
900 static ssize_t vfs_readv(struct file *file, const struct iovec __user *vec, in vfs_readv() argument
910 ret = do_iter_read(file, &iter, pos, flags); in vfs_readv()
917 static ssize_t vfs_writev(struct file *file, const struct iovec __user *vec, in vfs_writev() argument
927 file_start_write(file); in vfs_writev()
928 ret = do_iter_write(file, &iter, pos, flags); in vfs_writev()
929 file_end_write(file); in vfs_writev()
941 if (f.file) { in do_readv()
942 loff_t pos, *ppos = file_ppos(f.file); in do_readv()
947 ret = vfs_readv(f.file, vec, vlen, ppos, flags); in do_readv()
949 f.file->f_pos = pos; in do_readv()
965 if (f.file) { in do_writev()
966 loff_t pos, *ppos = file_ppos(f.file); in do_writev()
971 ret = vfs_writev(f.file, vec, vlen, ppos, flags); in do_writev()
973 f.file->f_pos = pos; in do_writev()
999 if (f.file) { in do_preadv()
1001 if (f.file->f_mode & FMODE_PREAD) in do_preadv()
1002 ret = vfs_readv(f.file, vec, vlen, &pos, flags); in do_preadv()
1022 if (f.file) { in do_pwritev()
1024 if (f.file->f_mode & FMODE_PWRITE) in do_pwritev()
1025 ret = vfs_writev(f.file, vec, vlen, &pos, flags); in do_pwritev()
1187 * Get input file, and verify that it is ok.. in do_sendfile()
1191 if (!in.file) in do_sendfile()
1193 if (!(in.file->f_mode & FMODE_READ)) in do_sendfile()
1197 pos = in.file->f_pos; in do_sendfile()
1200 if (!(in.file->f_mode & FMODE_PREAD)) in do_sendfile()
1203 retval = rw_verify_area(READ, in.file, &pos, count); in do_sendfile()
1210 * Get output file, and verify that it is ok.. in do_sendfile()
1214 if (!out.file) in do_sendfile()
1216 if (!(out.file->f_mode & FMODE_WRITE)) in do_sendfile()
1218 in_inode = file_inode(in.file); in do_sendfile()
1219 out_inode = file_inode(out.file); in do_sendfile()
1220 out_pos = out.file->f_pos; in do_sendfile()
1238 * EAGAIN on a non-blocking file descriptor. in do_sendfile()
1240 if (in.file->f_flags & O_NONBLOCK) in do_sendfile()
1243 opipe = get_pipe_info(out.file, true); in do_sendfile()
1245 retval = rw_verify_area(WRITE, out.file, &out_pos, count); in do_sendfile()
1248 file_start_write(out.file); in do_sendfile()
1249 retval = do_splice_direct(in.file, &pos, out.file, &out_pos, in do_sendfile()
1251 file_end_write(out.file); in do_sendfile()
1253 retval = splice_file_to_pipe(in.file, opipe, &pos, count, fl); in do_sendfile()
1259 fsnotify_access(in.file); in do_sendfile()
1260 fsnotify_modify(out.file); in do_sendfile()
1261 out.file->f_pos = out_pos; in do_sendfile()
1265 in.file->f_pos = pos; in do_sendfile()
1359 * @file_in: file structure to read from
1360 * @pos_in: file offset to read from
1361 * @file_out: file structure to write data to
1362 * @pos_out: file offset to write data to
1366 * This is a generic filesystem helper to copy data from one file to another.
1367 * It has no constraints on the source or destination file owners - the files
1378 ssize_t generic_copy_file_range(struct file *file_in, loff_t pos_in, in generic_copy_file_range()
1379 struct file *file_out, loff_t pos_out, in generic_copy_file_range()
1387 static ssize_t do_copy_file_range(struct file *file_in, loff_t pos_in, in do_copy_file_range()
1388 struct file *file_out, loff_t pos_out, in do_copy_file_range()
1393 * a file of the wrong filesystem type to filesystem driver can result in do_copy_file_range()
1410 * Performs necessary checks before doing a file copy
1416 static int generic_copy_file_checks(struct file *file_in, loff_t pos_in, in generic_copy_file_checks()
1417 struct file *file_out, loff_t pos_out, in generic_copy_file_checks()
1452 /* Don't allow overlapped copying within the same file. */ in generic_copy_file_checks()
1463 * copy_file_range() differs from regular file read and write in that it
1467 ssize_t vfs_copy_file_range(struct file *file_in, loff_t pos_in, in vfs_copy_file_range()
1468 struct file *file_out, loff_t pos_out, in vfs_copy_file_range()
1495 * Try cloning first, this is supported by more file systems, and in vfs_copy_file_range()
1543 if (!f_in.file) in SYSCALL_DEFINE6()
1547 if (!f_out.file) in SYSCALL_DEFINE6()
1555 pos_in = f_in.file->f_pos; in SYSCALL_DEFINE6()
1562 pos_out = f_out.file->f_pos; in SYSCALL_DEFINE6()
1565 ret = vfs_copy_file_range(f_in.file, pos_in, f_out.file, pos_out, len, in SYSCALL_DEFINE6()
1575 f_in.file->f_pos = pos_in; in SYSCALL_DEFINE6()
1582 f_out.file->f_pos = pos_out; in SYSCALL_DEFINE6()
1599 int generic_write_check_limits(struct file *file, loff_t pos, loff_t *count) in generic_write_check_limits() argument
1601 struct inode *inode = file->f_mapping->host; in generic_write_check_limits()
1613 if (!(file->f_flags & O_LARGEFILE)) in generic_write_check_limits()
1633 struct file *file = iocb->ki_filp; in generic_write_checks() local
1634 struct inode *inode = file->f_mapping->host; in generic_write_checks()
1652 ret = generic_write_check_limits(file, iocb->ki_pos, &count); in generic_write_checks()
1662 * Performs common checks before doing a file copy/clone
1665 int generic_file_rw_checks(struct file *file_in, struct file *file_out) in generic_file_rw_checks()