| Message ID | 20241115224459.427610-5-joannelkoong@gmail.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | fuse: remove temp page copies in writeback | expand |
On Fri, Nov 15, 2024 at 02:44:58PM -0800, Joanne Koong wrote: > 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. > > Signed-off-by: Joanne Koong <joannelkoong@gmail.com> Reviewed-by: Shakeel Butt <shakeel.butt@linux.dev>
diff --git a/mm/migrate.c b/mm/migrate.c index df91248755e4..fe73284e5246 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -1260,7 +1260,10 @@ 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;
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. Signed-off-by: Joanne Koong <joannelkoong@gmail.com> --- mm/migrate.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)