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
371 inode = file_inode(file); in rw_verify_area()
383 if (!unsigned_offsets(file)) in rw_verify_area()
388 if (!unsigned_offsets(file)) in rw_verify_area()
393 retval = locks_mandatory_area(inode, file, pos, pos + count - 1, in rw_verify_area()
400 return security_file_permission(file, in rw_verify_area()
404 static ssize_t new_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos) in new_sync_read()
422 static int warn_unsupported(struct file *file, const char *op) in warn_unsupported() argument
425 "kernel %s not supported for file %pD4 (pid: %d comm: %.20s)\n", in warn_unsupported()
426 op, file, current->pid, current->comm); in warn_unsupported()
430 ssize_t __kernel_read(struct file *file, void *buf, size_t count, loff_t *pos) in __kernel_read() argument
440 if (WARN_ON_ONCE(!(file->f_mode & FMODE_READ))) in __kernel_read()
442 if (!(file->f_mode & FMODE_CAN_READ)) in __kernel_read()
448 if (unlikely(!file->f_op->read_iter || file->f_op->read)) in __kernel_read()
449 return warn_unsupported(file, "read"); in __kernel_read()
451 init_sync_kiocb(&kiocb, file); in __kernel_read()
454 ret = file->f_op->read_iter(&kiocb, &iter); in __kernel_read()
458 fsnotify_access(file); in __kernel_read()
465 ssize_t kernel_read(struct file *file, void *buf, size_t count, loff_t *pos) in kernel_read() argument
469 ret = rw_verify_area(READ, file, pos, count); in kernel_read()
472 return __kernel_read(file, buf, count, pos); in kernel_read()
476 ssize_t vfs_read(struct file *file, char __user *buf, size_t count, loff_t *pos) in vfs_read() argument
480 if (!(file->f_mode & FMODE_READ)) in vfs_read()
482 if (!(file->f_mode & FMODE_CAN_READ)) in vfs_read()
487 ret = rw_verify_area(READ, file, pos, count); in vfs_read()
493 if (file->f_op->read) in vfs_read()
494 ret = file->f_op->read(file, buf, count, pos); in vfs_read()
495 else if (file->f_op->read_iter) in vfs_read()
496 ret = new_sync_read(file, buf, count, pos); in vfs_read()
500 fsnotify_access(file); in vfs_read()
507 static ssize_t new_sync_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos) in new_sync_write()
526 ssize_t __kernel_write(struct file *file, const void *buf, size_t count, loff_t *pos) in __kernel_write() argument
536 if (WARN_ON_ONCE(!(file->f_mode & FMODE_WRITE))) in __kernel_write()
538 if (!(file->f_mode & FMODE_CAN_WRITE)) in __kernel_write()
544 if (unlikely(!file->f_op->write_iter || file->f_op->write)) in __kernel_write()
545 return warn_unsupported(file, "write"); in __kernel_write()
547 init_sync_kiocb(&kiocb, file); in __kernel_write()
550 ret = file->f_op->write_iter(&kiocb, &iter); in __kernel_write()
554 fsnotify_modify(file); in __kernel_write()
569 ssize_t kernel_write(struct file *file, const void *buf, size_t count, in kernel_write() argument
574 ret = rw_verify_area(WRITE, file, pos, count); in kernel_write()
578 file_start_write(file); in kernel_write()
579 ret = __kernel_write(file, buf, count, pos); in kernel_write()
580 file_end_write(file); in kernel_write()
585 ssize_t vfs_write(struct file *file, const char __user *buf, size_t count, loff_t *pos) in vfs_write() argument
589 if (!(file->f_mode & FMODE_WRITE)) in vfs_write()
591 if (!(file->f_mode & FMODE_CAN_WRITE)) in vfs_write()
596 ret = rw_verify_area(WRITE, file, pos, count); in vfs_write()
601 file_start_write(file); in vfs_write()
602 if (file->f_op->write) in vfs_write()
603 ret = file->f_op->write(file, buf, count, pos); in vfs_write()
604 else if (file->f_op->write_iter) in vfs_write()
605 ret = new_sync_write(file, buf, count, pos); in vfs_write()
609 fsnotify_modify(file); in vfs_write()
613 file_end_write(file); in vfs_write()
617 /* file_ppos returns &file->f_pos or NULL if file is stream */
618 static inline loff_t *file_ppos(struct file *file) in file_ppos() argument
620 return file->f_mode & FMODE_STREAM ? NULL : &file->f_pos; in file_ppos()
628 if (f.file) { in ksys_read()
629 loff_t pos, *ppos = file_ppos(f.file); in ksys_read()
634 ret = vfs_read(f.file, buf, count, ppos); in ksys_read()
636 f.file->f_pos = pos; in ksys_read()
652 if (f.file) { in ksys_write()
653 loff_t pos, *ppos = file_ppos(f.file); in ksys_write()
658 ret = vfs_write(f.file, buf, count, ppos); in ksys_write()
660 f.file->f_pos = pos; in ksys_write()
683 if (f.file) { in ksys_pread64()
685 if (f.file->f_mode & FMODE_PREAD) in ksys_pread64()
686 ret = vfs_read(f.file, buf, count, &pos); in ksys_pread64()
709 if (f.file) { in ksys_pwrite64()
711 if (f.file->f_mode & FMODE_PWRITE) in ksys_pwrite64()
712 ret = vfs_write(f.file, buf, count, &pos); in ksys_pwrite64()
725 static ssize_t do_iter_readv_writev(struct file *filp, struct iov_iter *iter, in do_iter_readv_writev()
747 /* Do it by hand, with file-ops */
748 static ssize_t do_loop_readv_writev(struct file *filp, struct iov_iter *iter, in do_loop_readv_writev()
782 static ssize_t do_iter_read(struct file *file, struct iov_iter *iter, in do_iter_read() argument
788 if (!(file->f_mode & FMODE_READ)) in do_iter_read()
790 if (!(file->f_mode & FMODE_CAN_READ)) in do_iter_read()
796 ret = rw_verify_area(READ, file, pos, tot_len); in do_iter_read()
800 if (file->f_op->read_iter) in do_iter_read()
801 ret = do_iter_readv_writev(file, iter, pos, READ, flags); in do_iter_read()
803 ret = do_loop_readv_writev(file, iter, pos, READ, flags); in do_iter_read()
806 fsnotify_access(file); in do_iter_read()
810 ssize_t vfs_iocb_iter_read(struct file *file, struct kiocb *iocb, in vfs_iocb_iter_read() argument
816 if (!file->f_op->read_iter) in vfs_iocb_iter_read()
818 if (!(file->f_mode & FMODE_READ)) in vfs_iocb_iter_read()
820 if (!(file->f_mode & FMODE_CAN_READ)) in vfs_iocb_iter_read()
826 ret = rw_verify_area(READ, file, &iocb->ki_pos, tot_len); in vfs_iocb_iter_read()
830 ret = call_read_iter(file, iocb, iter); in vfs_iocb_iter_read()
833 fsnotify_access(file); in vfs_iocb_iter_read()
838 ssize_t vfs_iter_read(struct file *file, struct iov_iter *iter, loff_t *ppos, in vfs_iter_read() argument
841 if (!file->f_op->read_iter) in vfs_iter_read()
843 return do_iter_read(file, iter, ppos, flags); in vfs_iter_read()
847 static ssize_t do_iter_write(struct file *file, struct iov_iter *iter, in do_iter_write() argument
853 if (!(file->f_mode & FMODE_WRITE)) in do_iter_write()
855 if (!(file->f_mode & FMODE_CAN_WRITE)) in do_iter_write()
861 ret = rw_verify_area(WRITE, file, pos, tot_len); in do_iter_write()
865 if (file->f_op->write_iter) in do_iter_write()
866 ret = do_iter_readv_writev(file, iter, pos, WRITE, flags); in do_iter_write()
868 ret = do_loop_readv_writev(file, iter, pos, WRITE, flags); in do_iter_write()
870 fsnotify_modify(file); in do_iter_write()
874 ssize_t vfs_iocb_iter_write(struct file *file, struct kiocb *iocb, in vfs_iocb_iter_write() argument
880 if (!file->f_op->write_iter) in vfs_iocb_iter_write()
882 if (!(file->f_mode & FMODE_WRITE)) in vfs_iocb_iter_write()
884 if (!(file->f_mode & FMODE_CAN_WRITE)) in vfs_iocb_iter_write()
890 ret = rw_verify_area(WRITE, file, &iocb->ki_pos, tot_len); in vfs_iocb_iter_write()
894 ret = call_write_iter(file, iocb, iter); in vfs_iocb_iter_write()
896 fsnotify_modify(file); in vfs_iocb_iter_write()
902 ssize_t vfs_iter_write(struct file *file, struct iov_iter *iter, loff_t *ppos, in vfs_iter_write() argument
905 if (!file->f_op->write_iter) in vfs_iter_write()
907 return do_iter_write(file, iter, ppos, flags); in vfs_iter_write()
911 static ssize_t vfs_readv(struct file *file, const struct iovec __user *vec, in vfs_readv() argument
921 ret = do_iter_read(file, &iter, pos, flags); in vfs_readv()
928 static ssize_t vfs_writev(struct file *file, const struct iovec __user *vec, in vfs_writev() argument
938 file_start_write(file); in vfs_writev()
939 ret = do_iter_write(file, &iter, pos, flags); in vfs_writev()
940 file_end_write(file); in vfs_writev()
952 if (f.file) { in do_readv()
953 loff_t pos, *ppos = file_ppos(f.file); in do_readv()
958 ret = vfs_readv(f.file, vec, vlen, ppos, flags); in do_readv()
960 f.file->f_pos = pos; in do_readv()
976 if (f.file) { in do_writev()
977 loff_t pos, *ppos = file_ppos(f.file); in do_writev()
982 ret = vfs_writev(f.file, vec, vlen, ppos, flags); in do_writev()
984 f.file->f_pos = pos; in do_writev()
1010 if (f.file) { in do_preadv()
1012 if (f.file->f_mode & FMODE_PREAD) in do_preadv()
1013 ret = vfs_readv(f.file, vec, vlen, &pos, flags); in do_preadv()
1033 if (f.file) { in do_pwritev()
1035 if (f.file->f_mode & FMODE_PWRITE) in do_pwritev()
1036 ret = vfs_writev(f.file, vec, vlen, &pos, flags); in do_pwritev()
1197 * Get input file, and verify that it is ok.. in do_sendfile()
1201 if (!in.file) in do_sendfile()
1203 if (!(in.file->f_mode & FMODE_READ)) in do_sendfile()
1207 pos = in.file->f_pos; in do_sendfile()
1210 if (!(in.file->f_mode & FMODE_PREAD)) in do_sendfile()
1213 retval = rw_verify_area(READ, in.file, &pos, count); in do_sendfile()
1220 * Get output file, and verify that it is ok.. in do_sendfile()
1224 if (!out.file) in do_sendfile()
1226 if (!(out.file->f_mode & FMODE_WRITE)) in do_sendfile()
1228 in_inode = file_inode(in.file); in do_sendfile()
1229 out_inode = file_inode(out.file); in do_sendfile()
1230 out_pos = out.file->f_pos; in do_sendfile()
1231 retval = rw_verify_area(WRITE, out.file, &out_pos, count); in do_sendfile()
1251 * EAGAIN on a non-blocking file descriptor. in do_sendfile()
1253 if (in.file->f_flags & O_NONBLOCK) in do_sendfile()
1256 file_start_write(out.file); in do_sendfile()
1257 retval = do_splice_direct(in.file, &pos, out.file, &out_pos, count, fl); in do_sendfile()
1258 file_end_write(out.file); in do_sendfile()
1263 fsnotify_access(in.file); in do_sendfile()
1264 fsnotify_modify(out.file); in do_sendfile()
1265 out.file->f_pos = out_pos; in do_sendfile()
1269 in.file->f_pos = pos; in do_sendfile()
1363 * @file_in: file structure to read from
1364 * @pos_in: file offset to read from
1365 * @file_out: file structure to write data to
1366 * @pos_out: file offset to write data to
1370 * This is a generic filesystem helper to copy data from one file to another.
1371 * It has no constraints on the source or destination file owners - the files
1382 ssize_t generic_copy_file_range(struct file *file_in, loff_t pos_in, in generic_copy_file_range()
1383 struct file *file_out, loff_t pos_out, in generic_copy_file_range()
1391 static ssize_t do_copy_file_range(struct file *file_in, loff_t pos_in, in do_copy_file_range()
1392 struct file *file_out, loff_t pos_out, in do_copy_file_range()
1397 * a file of the wrong filesystem type to filesystem driver can result in do_copy_file_range()
1414 * Performs necessary checks before doing a file copy
1420 static int generic_copy_file_checks(struct file *file_in, loff_t pos_in, in generic_copy_file_checks()
1421 struct file *file_out, loff_t pos_out, in generic_copy_file_checks()
1456 /* Don't allow overlapped copying within the same file. */ in generic_copy_file_checks()
1467 * copy_file_range() differs from regular file read and write in that it
1471 ssize_t vfs_copy_file_range(struct file *file_in, loff_t pos_in, in vfs_copy_file_range()
1472 struct file *file_out, loff_t pos_out, in vfs_copy_file_range()
1499 * Try cloning first, this is supported by more file systems, and in vfs_copy_file_range()
1547 if (!f_in.file) in SYSCALL_DEFINE6()
1551 if (!f_out.file) in SYSCALL_DEFINE6()
1559 pos_in = f_in.file->f_pos; in SYSCALL_DEFINE6()
1566 pos_out = f_out.file->f_pos; in SYSCALL_DEFINE6()
1569 ret = vfs_copy_file_range(f_in.file, pos_in, f_out.file, pos_out, len, in SYSCALL_DEFINE6()
1579 f_in.file->f_pos = pos_in; in SYSCALL_DEFINE6()
1586 f_out.file->f_pos = pos_out; in SYSCALL_DEFINE6()
1603 int generic_write_check_limits(struct file *file, loff_t pos, loff_t *count) in generic_write_check_limits() argument
1605 struct inode *inode = file->f_mapping->host; in generic_write_check_limits()
1617 if (!(file->f_flags & O_LARGEFILE)) in generic_write_check_limits()
1637 struct file *file = iocb->ki_filp; in generic_write_checks() local
1638 struct inode *inode = file->f_mapping->host; in generic_write_checks()
1656 ret = generic_write_check_limits(file, iocb->ki_pos, &count); in generic_write_checks()
1666 * Performs common checks before doing a file copy/clone
1669 int generic_file_rw_checks(struct file *file_in, struct file *file_out) in generic_file_rw_checks()