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 * @maxsize: 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 default_llseek(struct file *file, loff_t offset, int whence) in default_llseek() argument
232 struct inode *inode = file_inode(file); in default_llseek()
242 retval = file->f_pos; in default_llseek()
245 offset += file->f_pos; in default_llseek()
249 * In the generic case the entire file is data, so as in default_llseek()
250 * long as offset isn't at the end of the file then the in default_llseek()
260 * There is a virtual hole at the end of the file, so in default_llseek()
272 if (offset >= 0 || unsigned_offsets(file)) { in default_llseek()
273 if (offset != file->f_pos) { in default_llseek()
274 file->f_pos = offset; in default_llseek()
275 file->f_version = 0; in default_llseek()
285 loff_t vfs_llseek(struct file *file, loff_t offset, int whence) in vfs_llseek() argument
287 if (!(file->f_mode & FMODE_LSEEK)) in vfs_llseek()
289 return file->f_op->llseek(file, offset, whence); in vfs_llseek()
297 if (!f.file) in ksys_lseek()
302 loff_t res = vfs_llseek(f.file, offset, whence); in ksys_lseek()
333 if (!f.file) in SYSCALL_DEFINE5()
340 offset = vfs_llseek(f.file, ((loff_t) offset_high << 32) | offset_low, in SYSCALL_DEFINE5()
355 int rw_verify_area(int read_write, struct file *file, const loff_t *ppos, size_t count) in rw_verify_area() argument
367 if (!unsigned_offsets(file)) in rw_verify_area()
372 if (!unsigned_offsets(file)) in rw_verify_area()
377 ret = security_file_permission(file, mask); in rw_verify_area()
381 return fsnotify_file_area_perm(file, mask, ppos, count); in rw_verify_area()
385 static ssize_t new_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos) in new_sync_read()
402 static int warn_unsupported(struct file *file, const char *op) in warn_unsupported() argument
405 "kernel %s not supported for file %pD4 (pid: %d comm: %.20s)\n", in warn_unsupported()
406 op, file, current->pid, current->comm); in warn_unsupported()
410 ssize_t __kernel_read(struct file *file, void *buf, size_t count, loff_t *pos) in __kernel_read() argument
420 if (WARN_ON_ONCE(!(file->f_mode & FMODE_READ))) in __kernel_read()
422 if (!(file->f_mode & FMODE_CAN_READ)) in __kernel_read()
428 if (unlikely(!file->f_op->read_iter || file->f_op->read)) in __kernel_read()
429 return warn_unsupported(file, "read"); in __kernel_read()
431 init_sync_kiocb(&kiocb, file); in __kernel_read()
434 ret = file->f_op->read_iter(&kiocb, &iter); in __kernel_read()
438 fsnotify_access(file); in __kernel_read()
445 ssize_t kernel_read(struct file *file, void *buf, size_t count, loff_t *pos) in kernel_read() argument
449 ret = rw_verify_area(READ, file, pos, count); in kernel_read()
452 return __kernel_read(file, buf, count, pos); in kernel_read()
456 ssize_t vfs_read(struct file *file, char __user *buf, size_t count, loff_t *pos) in vfs_read() argument
460 if (!(file->f_mode & FMODE_READ)) in vfs_read()
462 if (!(file->f_mode & FMODE_CAN_READ)) in vfs_read()
467 ret = rw_verify_area(READ, file, pos, count); in vfs_read()
473 if (file->f_op->read) in vfs_read()
474 ret = file->f_op->read(file, buf, count, pos); in vfs_read()
475 else if (file->f_op->read_iter) in vfs_read()
476 ret = new_sync_read(file, buf, count, pos); in vfs_read()
480 fsnotify_access(file); in vfs_read()
487 static ssize_t new_sync_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos) in new_sync_write()
505 ssize_t __kernel_write_iter(struct file *file, struct iov_iter *from, loff_t *pos) in __kernel_write_iter() argument
510 if (WARN_ON_ONCE(!(file->f_mode & FMODE_WRITE))) in __kernel_write_iter()
512 if (!(file->f_mode & FMODE_CAN_WRITE)) in __kernel_write_iter()
518 if (unlikely(!file->f_op->write_iter || file->f_op->write)) in __kernel_write_iter()
519 return warn_unsupported(file, "write"); in __kernel_write_iter()
521 init_sync_kiocb(&kiocb, file); in __kernel_write_iter()
523 ret = file->f_op->write_iter(&kiocb, from); in __kernel_write_iter()
527 fsnotify_modify(file); in __kernel_write_iter()
535 ssize_t __kernel_write(struct file *file, const void *buf, size_t count, loff_t *pos) in __kernel_write() argument
543 return __kernel_write_iter(file, &iter, pos); in __kernel_write()
554 ssize_t kernel_write(struct file *file, const void *buf, size_t count, in kernel_write() argument
559 ret = rw_verify_area(WRITE, file, pos, count); in kernel_write()
563 file_start_write(file); in kernel_write()
564 ret = __kernel_write(file, buf, count, pos); in kernel_write()
565 file_end_write(file); in kernel_write()
570 ssize_t vfs_write(struct file *file, const char __user *buf, size_t count, loff_t *pos) in vfs_write() argument
574 if (!(file->f_mode & FMODE_WRITE)) in vfs_write()
576 if (!(file->f_mode & FMODE_CAN_WRITE)) in vfs_write()
581 ret = rw_verify_area(WRITE, file, pos, count); in vfs_write()
586 file_start_write(file); in vfs_write()
587 if (file->f_op->write) in vfs_write()
588 ret = file->f_op->write(file, buf, count, pos); in vfs_write()
589 else if (file->f_op->write_iter) in vfs_write()
590 ret = new_sync_write(file, buf, count, pos); in vfs_write()
594 fsnotify_modify(file); in vfs_write()
598 file_end_write(file); in vfs_write()
602 /* file_ppos returns &file->f_pos or NULL if file is stream */
603 static inline loff_t *file_ppos(struct file *file) in file_ppos() argument
605 return file->f_mode & FMODE_STREAM ? NULL : &file->f_pos; in file_ppos()
613 if (f.file) { in ksys_read()
614 loff_t pos, *ppos = file_ppos(f.file); in ksys_read()
619 ret = vfs_read(f.file, buf, count, ppos); in ksys_read()
621 f.file->f_pos = pos; in ksys_read()
637 if (f.file) { in ksys_write()
638 loff_t pos, *ppos = file_ppos(f.file); in ksys_write()
643 ret = vfs_write(f.file, buf, count, ppos); in ksys_write()
645 f.file->f_pos = pos; in ksys_write()
668 if (f.file) { in ksys_pread64()
670 if (f.file->f_mode & FMODE_PREAD) in ksys_pread64()
671 ret = vfs_read(f.file, buf, count, &pos); in ksys_pread64()
702 if (f.file) { in ksys_pwrite64()
704 if (f.file->f_mode & FMODE_PWRITE) in ksys_pwrite64()
705 ret = vfs_write(f.file, buf, count, &pos); in ksys_pwrite64()
726 static ssize_t do_iter_readv_writev(struct file *filp, struct iov_iter *iter, in do_iter_readv_writev()
748 /* Do it by hand, with file-ops */
749 static ssize_t do_loop_readv_writev(struct file *filp, struct iov_iter *iter, in do_loop_readv_writev()
782 ssize_t vfs_iocb_iter_read(struct file *file, struct kiocb *iocb, in vfs_iocb_iter_read() argument
788 if (!file->f_op->read_iter) in vfs_iocb_iter_read()
790 if (!(file->f_mode & FMODE_READ)) in vfs_iocb_iter_read()
792 if (!(file->f_mode & FMODE_CAN_READ)) in vfs_iocb_iter_read()
798 ret = rw_verify_area(READ, file, &iocb->ki_pos, tot_len); in vfs_iocb_iter_read()
802 ret = call_read_iter(file, iocb, iter); in vfs_iocb_iter_read()
805 fsnotify_access(file); in vfs_iocb_iter_read()
810 ssize_t vfs_iter_read(struct file *file, struct iov_iter *iter, loff_t *ppos, in vfs_iter_read() argument
816 if (!file->f_op->read_iter) in vfs_iter_read()
818 if (!(file->f_mode & FMODE_READ)) in vfs_iter_read()
820 if (!(file->f_mode & FMODE_CAN_READ)) in vfs_iter_read()
826 ret = rw_verify_area(READ, file, ppos, tot_len); in vfs_iter_read()
830 ret = do_iter_readv_writev(file, iter, ppos, READ, flags); in vfs_iter_read()
833 fsnotify_access(file); in vfs_iter_read()
842 ssize_t vfs_iocb_iter_write(struct file *file, struct kiocb *iocb, in vfs_iocb_iter_write() argument
848 if (!file->f_op->write_iter) in vfs_iocb_iter_write()
850 if (!(file->f_mode & FMODE_WRITE)) in vfs_iocb_iter_write()
852 if (!(file->f_mode & FMODE_CAN_WRITE)) in vfs_iocb_iter_write()
858 ret = rw_verify_area(WRITE, file, &iocb->ki_pos, tot_len); in vfs_iocb_iter_write()
863 ret = call_write_iter(file, iocb, iter); in vfs_iocb_iter_write()
867 fsnotify_modify(file); in vfs_iocb_iter_write()
873 ssize_t vfs_iter_write(struct file *file, struct iov_iter *iter, loff_t *ppos, in vfs_iter_write() argument
879 if (!(file->f_mode & FMODE_WRITE)) in vfs_iter_write()
881 if (!(file->f_mode & FMODE_CAN_WRITE)) in vfs_iter_write()
883 if (!file->f_op->write_iter) in vfs_iter_write()
890 ret = rw_verify_area(WRITE, file, ppos, tot_len); in vfs_iter_write()
894 file_start_write(file); in vfs_iter_write()
895 ret = do_iter_readv_writev(file, iter, ppos, WRITE, flags); in vfs_iter_write()
897 fsnotify_modify(file); in vfs_iter_write()
898 file_end_write(file); in vfs_iter_write()
904 static ssize_t vfs_readv(struct file *file, const struct iovec __user *vec, in vfs_readv() argument
913 if (!(file->f_mode & FMODE_READ)) in vfs_readv()
915 if (!(file->f_mode & FMODE_CAN_READ)) in vfs_readv()
927 ret = rw_verify_area(READ, file, pos, tot_len); in vfs_readv()
931 if (file->f_op->read_iter) in vfs_readv()
932 ret = do_iter_readv_writev(file, &iter, pos, READ, flags); in vfs_readv()
934 ret = do_loop_readv_writev(file, &iter, pos, READ, flags); in vfs_readv()
937 fsnotify_access(file); in vfs_readv()
942 static ssize_t vfs_writev(struct file *file, const struct iovec __user *vec, in vfs_writev() argument
951 if (!(file->f_mode & FMODE_WRITE)) in vfs_writev()
953 if (!(file->f_mode & FMODE_CAN_WRITE)) in vfs_writev()
965 ret = rw_verify_area(WRITE, file, pos, tot_len); in vfs_writev()
969 file_start_write(file); in vfs_writev()
970 if (file->f_op->write_iter) in vfs_writev()
971 ret = do_iter_readv_writev(file, &iter, pos, WRITE, flags); in vfs_writev()
973 ret = do_loop_readv_writev(file, &iter, pos, WRITE, flags); in vfs_writev()
975 fsnotify_modify(file); in vfs_writev()
976 file_end_write(file); in vfs_writev()
988 if (f.file) { in do_readv()
989 loff_t pos, *ppos = file_ppos(f.file); in do_readv()
994 ret = vfs_readv(f.file, vec, vlen, ppos, flags); in do_readv()
996 f.file->f_pos = pos; in do_readv()
1012 if (f.file) { in do_writev()
1013 loff_t pos, *ppos = file_ppos(f.file); in do_writev()
1018 ret = vfs_writev(f.file, vec, vlen, ppos, flags); in do_writev()
1020 f.file->f_pos = pos; in do_writev()
1046 if (f.file) { in do_preadv()
1048 if (f.file->f_mode & FMODE_PREAD) in do_preadv()
1049 ret = vfs_readv(f.file, vec, vlen, &pos, flags); in do_preadv()
1069 if (f.file) { in do_pwritev()
1071 if (f.file->f_mode & FMODE_PWRITE) in do_pwritev()
1072 ret = vfs_writev(f.file, vec, vlen, &pos, flags); in do_pwritev()
1234 * Get input file, and verify that it is ok.. in do_sendfile()
1238 if (!in.file) in do_sendfile()
1240 if (!(in.file->f_mode & FMODE_READ)) in do_sendfile()
1244 pos = in.file->f_pos; in do_sendfile()
1247 if (!(in.file->f_mode & FMODE_PREAD)) in do_sendfile()
1250 retval = rw_verify_area(READ, in.file, &pos, count); in do_sendfile()
1257 * Get output file, and verify that it is ok.. in do_sendfile()
1261 if (!out.file) in do_sendfile()
1263 if (!(out.file->f_mode & FMODE_WRITE)) in do_sendfile()
1265 in_inode = file_inode(in.file); in do_sendfile()
1266 out_inode = file_inode(out.file); in do_sendfile()
1267 out_pos = out.file->f_pos; in do_sendfile()
1285 * EAGAIN on a non-blocking file descriptor. in do_sendfile()
1287 if (in.file->f_flags & O_NONBLOCK) in do_sendfile()
1290 opipe = get_pipe_info(out.file, true); in do_sendfile()
1292 retval = rw_verify_area(WRITE, out.file, &out_pos, count); in do_sendfile()
1295 retval = do_splice_direct(in.file, &pos, out.file, &out_pos, in do_sendfile()
1298 if (out.file->f_flags & O_NONBLOCK) in do_sendfile()
1301 retval = splice_file_to_pipe(in.file, opipe, &pos, count, fl); in do_sendfile()
1307 fsnotify_access(in.file); in do_sendfile()
1308 fsnotify_modify(out.file); in do_sendfile()
1309 out.file->f_pos = out_pos; in do_sendfile()
1313 in.file->f_pos = pos; in do_sendfile()
1406 * Performs necessary checks before doing a file copy
1412 static int generic_copy_file_checks(struct file *file_in, loff_t pos_in, in generic_copy_file_checks()
1413 struct file *file_out, loff_t pos_out, in generic_copy_file_checks()
1428 * a file of the wrong filesystem type to filesystem driver can result in generic_copy_file_checks()
1468 /* Don't allow overlapped copying within the same file. */ in generic_copy_file_checks()
1479 * copy_file_range() differs from regular file read and write in that it
1483 ssize_t vfs_copy_file_range(struct file *file_in, loff_t pos_in, in vfs_copy_file_range()
1484 struct file *file_out, loff_t pos_out, in vfs_copy_file_range()
1513 * Cloning is supported by more file systems, so we implement copy on in vfs_copy_file_range()
1555 * to splicing from input file, while file_start_write() is held on in vfs_copy_file_range()
1556 * the output file on a different sb. in vfs_copy_file_range()
1586 if (!f_in.file) in SYSCALL_DEFINE6()
1590 if (!f_out.file) in SYSCALL_DEFINE6()
1598 pos_in = f_in.file->f_pos; in SYSCALL_DEFINE6()
1605 pos_out = f_out.file->f_pos; in SYSCALL_DEFINE6()
1612 ret = vfs_copy_file_range(f_in.file, pos_in, f_out.file, pos_out, len, in SYSCALL_DEFINE6()
1622 f_in.file->f_pos = pos_in; in SYSCALL_DEFINE6()
1629 f_out.file->f_pos = pos_out; in SYSCALL_DEFINE6()
1646 int generic_write_check_limits(struct file *file, loff_t pos, loff_t *count) in generic_write_check_limits() argument
1648 struct inode *inode = file->f_mapping->host; in generic_write_check_limits()
1660 if (!(file->f_flags & O_LARGEFILE)) in generic_write_check_limits()
1674 struct file *file = iocb->ki_filp; in generic_write_checks_count() local
1675 struct inode *inode = file->f_mapping->host; in generic_write_checks_count()
1688 (file->f_mode & FMODE_BUF_WASYNC))) in generic_write_checks_count()
1717 * Performs common checks before doing a file copy/clone
1720 int generic_file_rw_checks(struct file *file_in, struct file *file_out) in generic_file_rw_checks()