locks.c (269a6194dcbaa5d8e61f32000486fc0f2acf08d0) locks.c (d9077f7bad141df143cc4fa000a68a868bcea7c0)
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * linux/fs/locks.c
4 *
5 * We implement four types of file locks: BSD locks, posix locks, open
6 * file description locks, and leases. For details about BSD locks,
7 * see the flock(2) man page; for details about the other three, see
8 * fcntl(2).

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434 fl->c.flc_file = filp;
435 fl->c.flc_owner = filp;
436 fl->c.flc_pid = current->tgid;
437 fl->c.flc_flags = FL_FLOCK;
438 fl->c.flc_type = type;
439 fl->fl_end = OFFSET_MAX;
440}
441
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * linux/fs/locks.c
4 *
5 * We implement four types of file locks: BSD locks, posix locks, open
6 * file description locks, and leases. For details about BSD locks,
7 * see the flock(2) man page; for details about the other three, see
8 * fcntl(2).

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434 fl->c.flc_file = filp;
435 fl->c.flc_owner = filp;
436 fl->c.flc_pid = current->tgid;
437 fl->c.flc_flags = FL_FLOCK;
438 fl->c.flc_type = type;
439 fl->fl_end = OFFSET_MAX;
440}
441
442static int assign_type(struct file_lock *fl, int type)
442static int assign_type(struct file_lock_core *flc, int type)
443{
444 switch (type) {
445 case F_RDLCK:
446 case F_WRLCK:
447 case F_UNLCK:
443{
444 switch (type) {
445 case F_RDLCK:
446 case F_WRLCK:
447 case F_UNLCK:
448 fl->c.flc_type = type;
448 flc->flc_type = type;
449 break;
450 default:
451 return -EINVAL;
452 }
453 return 0;
454}
455
456static int flock64_to_posix_lock(struct file *filp, struct file_lock *fl,

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492
493 fl->c.flc_owner = current->files;
494 fl->c.flc_pid = current->tgid;
495 fl->c.flc_file = filp;
496 fl->c.flc_flags = FL_POSIX;
497 fl->fl_ops = NULL;
498 fl->fl_lmops = NULL;
499
449 break;
450 default:
451 return -EINVAL;
452 }
453 return 0;
454}
455
456static int flock64_to_posix_lock(struct file *filp, struct file_lock *fl,

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492
493 fl->c.flc_owner = current->files;
494 fl->c.flc_pid = current->tgid;
495 fl->c.flc_file = filp;
496 fl->c.flc_flags = FL_POSIX;
497 fl->fl_ops = NULL;
498 fl->fl_lmops = NULL;
499
500 return assign_type(fl, l->l_type);
500 return assign_type(&fl->c, l->l_type);
501}
502
503/* Verify a "struct flock" and copy it to a "struct file_lock" as a POSIX
504 * style lock.
505 */
506static int flock_to_posix_lock(struct file *filp, struct file_lock *fl,
507 struct flock *l)
508{

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547 .lm_setup = lease_setup,
548};
549
550/*
551 * Initialize a lease, use the default lock manager operations
552 */
553static int lease_init(struct file *filp, int type, struct file_lock *fl)
554{
501}
502
503/* Verify a "struct flock" and copy it to a "struct file_lock" as a POSIX
504 * style lock.
505 */
506static int flock_to_posix_lock(struct file *filp, struct file_lock *fl,
507 struct flock *l)
508{

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547 .lm_setup = lease_setup,
548};
549
550/*
551 * Initialize a lease, use the default lock manager operations
552 */
553static int lease_init(struct file *filp, int type, struct file_lock *fl)
554{
555 if (assign_type(fl, type) != 0)
555 if (assign_type(&fl->c, type) != 0)
556 return -EINVAL;
557
558 fl->c.flc_owner = filp;
559 fl->c.flc_pid = current->tgid;
560
561 fl->c.flc_file = filp;
562 fl->c.flc_flags = FL_LEASE;
563 fl->fl_start = 0;

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1404 case F_RDLCK:
1405 fl->c.flc_flags &= ~FL_DOWNGRADE_PENDING;
1406 }
1407}
1408
1409/* We already had a lease on this file; just change its type */
1410int lease_modify(struct file_lock *fl, int arg, struct list_head *dispose)
1411{
556 return -EINVAL;
557
558 fl->c.flc_owner = filp;
559 fl->c.flc_pid = current->tgid;
560
561 fl->c.flc_file = filp;
562 fl->c.flc_flags = FL_LEASE;
563 fl->fl_start = 0;

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1404 case F_RDLCK:
1405 fl->c.flc_flags &= ~FL_DOWNGRADE_PENDING;
1406 }
1407}
1408
1409/* We already had a lease on this file; just change its type */
1410int lease_modify(struct file_lock *fl, int arg, struct list_head *dispose)
1411{
1412 int error = assign_type(fl, arg);
1412 int error = assign_type(&fl->c, arg);
1413
1414 if (error)
1415 return error;
1416 lease_clear_pending(fl, arg);
1417 locks_wake_up_blocks(fl);
1418 if (arg == F_UNLCK) {
1419 struct file *filp = fl->c.flc_file;
1420

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1414 if (error)
1415 return error;
1416 lease_clear_pending(fl, arg);
1417 locks_wake_up_blocks(fl);
1418 if (arg == F_UNLCK) {
1419 struct file *filp = fl->c.flc_file;
1420

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