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rhashtable: Change rhashtable_walk_start to return void

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Most callers of rhashtable_walk_start don't care about a resize event
which is indicated by a return value of -EAGAIN. So calls to
rhashtable_walk_start are wrapped wih code to ignore -EAGAIN. Something
like this is common:

       ret = rhashtable_walk_start(rhiter);
       if (ret && ret != -EAGAIN)
               goto out;

Since zero and -EAGAIN are the only possible return values from the
function this check is pointless. The condition never evaluates to true.

This patch changes rhashtable_walk_start to return void. This simplifies
code for the callers that ignore -EAGAIN. For the few cases where the
caller cares about the resize event, particularly where the table can be
walked in mulitple parts for netlink or seq file dump, the function
rhashtable_walk_start_check has been added that returns -EAGAIN on a
resize event.

Signed-off-by: Tom Herbert <[email protected]>
Acked-by: Herbert Xu <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Tom Herbert 2017-12-04 10:31:41 -08:00 • committed by David S. Miller
commit 97a6ec4ac0
16 changed files with 48 additions and 94 deletions
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7
fs/gfs2/glock.c
View file

@ -1549,16 +1549,13 @@ static void glock_hash_walk(glock_examiner examiner, const struct gfs2_sbd *sdp)
rhashtable_walk_enter(&gl_hash_table, &iter);
do {
gl = ERR_PTR(rhashtable_walk_start(&iter));
if (IS_ERR(gl))
goto walk_stop;
rhashtable_walk_start(&iter);
while ((gl = rhashtable_walk_next(&iter)) && !IS_ERR(gl))
if (gl->gl_name.ln_sbd == sdp &&
lockref_get_not_dead(&gl->gl_lockref))
examiner(gl);
walk_stop:
rhashtable_walk_stop(&iter);
} while (cond_resched(), gl == ERR_PTR(-EAGAIN));
@ -1947,7 +1944,7 @@ static void *gfs2_glock_seq_start(struct seq_file *seq, loff_t *pos)
loff_t n = *pos;
rhashtable_walk_enter(&gl_hash_table, &gi->hti);
if (rhashtable_walk_start(&gi->hti) != 0)
if (rhashtable_walk_start_check(&gi->hti) != 0)
return NULL;
do {