VFS_SETLEASE(9) The Linux VFS VFS_SETLEASE(9)NAMEvfs_setlease - sets a lease on an open file
SYNOPSIS
int vfs_setlease(struct file * filp, long arg,
struct file_lock ** lease);
ARGUMENTS
filp
file pointer
arg
type of lease to obtain
lease
file_lock to use
DESCRIPTION
Call this to establish a lease on the file. The
(*lease)->fl_lmops->lm_break operation must be set; if not, break_lease
will oops!
This will call the filesystem's setlease file method, if defined. Note
that there is no getlease method; instead, the filesystem setlease
method should call back to setlease to add a lease to the inode's lease
list, where fcntl_getlease can find it. Since fcntl_getlease only
reports whether the current task holds a lease, a cluster filesystem
need only do this for leases held by processes on this node.
There is also no break_lease method; filesystems that handle their own
leases should break leases themselves from the filesystem's open,
create, and (on truncate) setattr methods.
WARNING
the only current setlease methods exist only to disable leases in
certain cases. More vfs changes may be required to allow a full
filesystem lease implementation.
COPYRIGHTKernel Hackers Manual 3.11 November 2013 VFS_SETLEASE(9)
