| locks.c (a9933cea7a1d80dd9efae9f1acd857f5dce742b9) | locks.c (f9ffed26d6f3e6ac9988947242821579d615fda7) |
|---|---|
| 1/* 2 * linux/fs/locks.c 3 * 4 * Provide support for fcntl()'s F_GETLK, F_SETLK, and F_SETLKW calls. 5 * Doug Evans (dje@spiff.uucp), August 07, 1992 6 * 7 * Deadlock detection added. 8 * FIXME: one thing isn't handled yet: --- 1415 unchanged lines hidden (view full) --- 1424 1425 /** 1426 * vfs_setlease - sets a lease on an open file 1427 * @filp: file pointer 1428 * @arg: type of lease to obtain 1429 * @lease: file_lock to use 1430 * 1431 * Call this to establish a lease on the file. | 1/* 2 * linux/fs/locks.c 3 * 4 * Provide support for fcntl()'s F_GETLK, F_SETLK, and F_SETLKW calls. 5 * Doug Evans (dje@spiff.uucp), August 07, 1992 6 * 7 * Deadlock detection added. 8 * FIXME: one thing isn't handled yet: --- 1415 unchanged lines hidden (view full) --- 1424 1425 /** 1426 * vfs_setlease - sets a lease on an open file 1427 * @filp: file pointer 1428 * @arg: type of lease to obtain 1429 * @lease: file_lock to use 1430 * 1431 * Call this to establish a lease on the file. |
| 1432 * The fl_lmops fl_break function is required by break_lease | 1432 * The (*lease)->fl_lmops->fl_break operation must be set; if not, 1433 * break_lease will oops! 1434 * 1435 * This will call the filesystem's setlease file method, if 1436 * defined. Note that there is no getlease method; instead, the 1437 * filesystem setlease method should call back to setlease() to 1438 * add a lease to the inode's lease list, where fcntl_getlease() can 1439 * find it. Since fcntl_getlease() only reports whether the current 1440 * task holds a lease, a cluster filesystem need only do this for 1441 * leases held by processes on this node. 1442 * 1443 * There is also no break_lease method; filesystems that 1444 * handle their own leases shoud break leases themselves from the 1445 * filesystem's open, create, and (on truncate) setattr methods. 1446 * 1447 * Warning: the only current setlease methods exist only to disable 1448 * leases in certain cases. More vfs changes may be required to 1449 * allow a full filesystem lease implementation. |
| 1433 */ 1434 1435int vfs_setlease(struct file *filp, long arg, struct file_lock **lease) 1436{ 1437 int error; 1438 1439 lock_kernel(); | 1450 */ 1451 1452int vfs_setlease(struct file *filp, long arg, struct file_lock **lease) 1453{ 1454 int error; 1455 1456 lock_kernel(); |
| 1440 error = setlease(filp, arg, lease); | 1457 if (filp->f_op && filp->f_op->setlease) 1458 error = filp->f_op->setlease(filp, arg, lease); 1459 else 1460 error = setlease(filp, arg, lease); |
| 1441 unlock_kernel(); 1442 1443 return error; 1444} 1445EXPORT_SYMBOL_GPL(vfs_setlease); 1446 1447/** 1448 * fcntl_setlease - sets a lease on an open file --- 817 unchanged lines hidden --- | 1461 unlock_kernel(); 1462 1463 return error; 1464} 1465EXPORT_SYMBOL_GPL(vfs_setlease); 1466 1467/** 1468 * fcntl_setlease - sets a lease on an open file --- 817 unchanged lines hidden --- |