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locks: setlease cleanup 

There's an incorrect comment here.  Also clean up the logic: the
"rdlease" and "wrlease" locals are confusingly named, and don't really
add anything since we can make a decision as soon as we hit one of these
cases.

Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
J. Bruce Fields 2011-08-19 10:59:49 -04:00
parent 778fc546f7
commit c1f24ef4ed
1 changed files with 17 additions and 16 deletions
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33
fs/locks.c
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@ -1368,7 +1368,7 @@ int generic_setlease(struct file *filp, long arg, struct file_lock **flp)
struct file_lock *fl, **before, **my_before = NULL, *lease; struct file_lock *fl, **before, **my_before = NULL, *lease;
struct dentry *dentry = filp->f_path.dentry; struct dentry *dentry = filp->f_path.dentry;
struct inode *inode = dentry->d_inode; struct inode *inode = dentry->d_inode;
int error, rdlease_count = 0, wrlease_count = 0; int error;
lease = *flp; lease = *flp;
@ -1404,27 +1404,28 @@ int generic_setlease(struct file *filp, long arg, struct file_lock **flp)
* then the file is not open by anyone (including us) * then the file is not open by anyone (including us)
* except for this filp. * except for this filp.
*/ */
error = -EAGAIN;
for (before = &inode->i_flock; for (before = &inode->i_flock;
((fl = *before) != NULL) && IS_LEASE(fl); ((fl = *before) != NULL) && IS_LEASE(fl);
before = &fl->fl_next) { before = &fl->fl_next) {
if (fl->fl_file == filp) if (fl->fl_file == filp) {
my_before = before; my_before = before;
else if (fl->fl_flags & FL_UNLOCK_PENDING) continue;
/* }
* Someone is in the process of opening this /*
* file for writing so we may not take an * No exclusive leases if someone else has a lease on
* exclusive lease on it. * this file:
*/ */
wrlease_count++; if (arg == F_WRLCK)
else goto out;
rdlease_count++; /*
* Modifying our existing lease is OK, but no getting a
* new lease if someone else is opening for write:
*/
if (fl->fl_flags & FL_UNLOCK_PENDING)
goto out;
} }
error = -EAGAIN;
if ((arg == F_RDLCK && (wrlease_count > 0)) ||
(arg == F_WRLCK && ((rdlease_count + wrlease_count) > 0)))
goto out;
if (my_before != NULL) { if (my_before != NULL) {
error = lease->fl_lmops->lm_change(my_before, arg); error = lease->fl_lmops->lm_change(my_before, arg);
if (!error) if (!error)