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gfs2: Clean up gfs2_scan_glock_lru

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Switch to list_for_each_entry_safe() and eliminate the "skipped" list in
gfs2_scan_glock_lru().

At the same time, scan the requested number of items to scan, not one
more than that number.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
This commit is contained in:
Andreas Gruenbacher 2022-12-10 02:14:04 +01:00
parent 2d1439557f
commit 8fb8f70ec7
1 changed files with 4 additions and 9 deletions
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13
fs/gfs2/glock.c
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@ -1985,26 +1985,21 @@ add_back_to_lru:
static long gfs2_scan_glock_lru(int nr)
{
struct gfs2_glock *gl;
LIST_HEAD(skipped);
struct gfs2_glock *gl, *next;
LIST_HEAD(dispose);
long freed = 0;
spin_lock(&lru_lock);
while ((nr-- >= 0) && !list_empty(&lru_list)) {
gl = list_first_entry(&lru_list, struct gfs2_glock, gl_lru);
list_for_each_entry_safe(gl, next, &lru_list, gl_lru) {
if (nr-- <= 0)
break;
/* Test for being demotable */
if (!test_bit(GLF_LOCK, &gl->gl_flags)) {
list_move(&gl->gl_lru, &dispose);
atomic_dec(&lru_count);
freed++;
continue;
}
list_move(&gl->gl_lru, &skipped);
}
list_splice(&skipped, &lru_list);
if (!list_empty(&dispose))
gfs2_dispose_glock_lru(&dispose);
spin_unlock(&lru_lock);