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charset="iso-2022-jp" Content-Transfer-Encoding: quoted-printable Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-OriginatorOrg: transsion.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: KL1PR0401MB6611.apcprd04.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 7d211d95-ce7f-4e94-6add-08df04fe7b14 X-MS-Exchange-CrossTenant-originalarrivaltime: 28 Aug 2026 12:18:34.2934 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 2e8503a6-2d01-4333-8e36-6ab7c8cd7ae2 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: nZW4c/mJ9c3r6p+D+ZQkN8M6xS5867h5Gu2oDz3CUVNK730dixQaRRR/tBN7ruR1nTrd+LTD5UmtFV7ZWZ51Eg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: TYSPR04MB8074 From: "ke.li11" =0A= =0A= This series improves multi-device F2FS for expandable storage setups=0A= where a secondary block device holds warm/cold data and may be removed=0A= after userspace performs a final shrink.=0A= =0A= Patch 1 adds an alloc_primary mount option. By default F2FS steers=0A= warm/cold allocations to the secondary device via ALLOC_NEXT; this=0A= option keeps them on the primary device when required by userspace=0A= volume management.=0A= =0A= Patch 2 extends f2fs_resize_fs() to allow a section-aligned shrink=0A= that fully removes the last secondary device. The on-disk superblock=0A= path for that device is cleared before commit so the next mount does=0A= not try to open a block device that userspace is deleting. The=0A= in-memory device is detached only after both the superblock update and=0A= checkpoint succeed; the path is restored if either step fails.=0A= =0A= Testing:=0A= - Mounted /data as a multi-device F2FS filesystem with a secondary expand= =0A= device (device=3Dexp_user_device)=0A= - Exercised dynamic resize while the expand volume is attached=0A= - Shrunk the filesystem until the entire exp_user_device is removed;=0A= this triggers the drop_last_dev path in f2fs_resize_fs()=0A= - Verified remount succeeds after userspace tears down the expand=0A= block device=0A= - Mounted with and without alloc_primary and verified allocation behavior= =0A= =0A= Signed-off-by: ke.li11 =0A= =0A= ke.li11 (2):=0A= f2fs: add alloc_primary mount option=0A= f2fs: allow f2fs_resize_fs to drop the last secondary device=0A= =0A= Documentation/filesystems/f2fs.rst | 3 +=0A= fs/f2fs/f2fs.h | 6 ++=0A= fs/f2fs/gc.c | 127 +++++++++++++++++++++++++++--=0A= fs/f2fs/super.c | 12 +++=0A= 4 files changed, 143 insertions(+), 5 deletions(-)=0A= =0A= -- =0A= 2.34.1=0A= =0A=