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we're going to need more than this ;-( > > static inline struct metapage *folio_to_mp(struct folio *folio, int offset) > { > return folio->private; > } > > struct metapage { > ... > void *data; /* Data pointer */ > > So we're going to need something like buffer_migrate_folio(), but > specialised to jfs metadata. And when we come up with it, that'll > be Fixes: 35474d52c605 I'm able to come up with a revised patch but testing seem tricky. I'm not sure how to trigger the metapage migration. --------------HqhnUjAWHZMhFZ2NQuN632wi Content-Type: text/plain; charset=UTF-8; name="0001-jfs-implement-migrate_folio-for-jfs_metapage_aops.patch" Content-Disposition: attachment; filename*0="0001-jfs-implement-migrate_folio-for-jfs_metapage_aops.patch" Content-Transfer-Encoding: base64 RnJvbSAwY2Q1N2QxMDJhMDdmNDUzZDRhNzIyMjE1Y2U4YWUzNGZmODFjMGExIE1vbiBTZXAgMTcg MDA6MDA6MDAgMjAwMQpGcm9tOiBTaGl2YW5rIEdhcmcgPHNoaXZhbmtnQGFtZC5jb20+CkRhdGU6 IFN1biwgMTMgQXByIDIwMjUgMTY6NDA6NTMgKzAwMDAKU3ViamVjdDogW1BBVENIXSBqZnM6IGlt cGxlbWVudCBtaWdyYXRlX2ZvbGlvIGZvciBqZnNfbWV0YXBhZ2VfYW9wcwoKQWRkIHRoZSBtaXNz aW5nIG1pZ3JhdGVfZm9saW8gb3BlcmF0aW9uIHRvIGpmc19tZXRhcGFnZV9hb3BzIHRvIGZpeAp3 YXJuaW5ncyBkdXJpbmcgbWVtb3J5IGNvbXBhY3Rpb24uIFRoZXNlIHdhcm5pbmdzIHdlcmUgaW50 cm9kdWNlZCBieQpjb21taXQgN2VlMzY0NzI0M2U1ICgibWlncmF0ZTogUmVtb3ZlIGNhbGwgdG8g LT53cml0ZXBhZ2UiKSB3aGljaAphZGRlZCBleHBsaWNpdCB3YXJuaW5ncyB3aGVuIGZpbGVzeXN0 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