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mm/migrate: skip migrating folios under writeback with AS_WRITEBACK_INDETERMINATE mappings

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For migrations called in MIGRATE_SYNC mode, skip migrating the folio if it
is under writeback and has the AS_WRITEBACK_INDETERMINATE flag set on its
mapping.  If the AS_WRITEBACK_INDETERMINATE flag is set on the mapping,
the writeback may take an indeterminate amount of time to complete, and
waits may get stuck.

Link: https://lkml.kernel.org/r/20241122232359.429647-5-joannelkoong@gmail.com
Signed-off-by: Joanne Koong <joannelkoong@gmail.com>
Reviewed-by: Shakeel Butt <shakeel.butt@linux.dev>
Acked-by: Miklos Szeredi <mszeredi@redhat.com>
Cc: Bernd Schubert <bernd.schubert@fastmail.fm>
Cc: Jingbo Xu <jefflexu@linux.alibaba.com>
Cc: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Joanne Koong 2024-11-22 15:23:58 -08:00 committed by Andrew Morton
parent 0da1c1a78d
commit 2cdf65eaaa
1 changed files with 4 additions and 1 deletions
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5
mm/migrate.c
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@ -1254,7 +1254,10 @@ static int migrate_folio_unmap(new_folio_t get_new_folio,
*/
switch (mode) {
case MIGRATE_SYNC:
break;
if (!src->mapping ||
!mapping_writeback_indeterminate(src->mapping))
break;
fallthrough;
default:
rc = -EBUSY;
goto out;