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locks: clean up vfs_setlease kerneldoc comments 

Some of the latter paragraphs seem ambiguous and just plain wrong.
In particular the break_lease comment makes no sense. We call
break_lease (and break_deleg) from all sorts of vfs-layer functions,
so there is clearly such a method.

Also get rid of some of the other comments about what's needed for
a full implementation.

Signed-off-by: Jeff Layton <jlayton@primarydata.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
hifive-unleashed-5.1
Jeff Layton 2014-08-22 18:13:28 -04:00
parent 0efaa7e82f
commit e51673aa5d
1 changed files with 9 additions and 23 deletions
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32
fs/locks.c
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@ -1708,30 +1708,16 @@ static int __vfs_setlease(struct file *filp, long arg, struct file_lock **lease)
}
/**
* vfs_setlease - sets a lease on an open file
* @filp: file pointer
* @arg: type of lease to obtain
* @lease: file_lock to use
* vfs_setlease - sets a lease on an open file
* @filp: file pointer
* @arg: type of lease to obtain
* @lease: file_lock to use when adding a lease
*
* 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.
* Call this to establish a lease on the file. The "lease" argument is not
* used for F_UNLCK requests and may be NULL. For commands that set or alter
* an existing lease, the (*lease)->fl_lmops->lm_break operation must be set;
* if not, this function will return -ENOLCK (and generate a scary-looking
* stack trace).
*/
int vfs_setlease(struct file *filp, long arg, struct file_lock **lease)