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From: Jeff Layton To: NeilBrown , stable@vger.kernel.org, Trond Myklebust , Anna Schumaker Cc: linux-nfs@vger.kernel.org, Dan Aloni Date: Wed, 06 Mar 2024 08:42:21 -0500 In-Reply-To: <170907621128.24797.4390391329078744015@noble.neil.brown.name> References: <170907621128.24797.4390391329078744015@noble.neil.brown.name> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; 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 kZWuOsJdJQdmwlWC5L5ln9xgfr/4mOY38B0U= Content-Type: text/plain; charset="ISO-8859-15" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.50.4 (3.50.4-1.fc39) Precedence: bulk X-Mailing-List: linux-nfs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Wed, 2024-02-28 at 10:23 +1100, NeilBrown wrote: > when AOP_WRITEPAGE_ACTIVATE is returned (as NFS does when it detects > congestion) it is important that the folio is redirtied. > nfs_writepage_locked() doesn't do this, so files can become corrupted as > writes can be lost. >=20 > Note that this is not needed in v6.8 as AOP_WRITEPAGE_ACTIVATE cannot be > returned. It is needed for kernels v5.18..v6.7. Prior to 6.3 the patch > is different as it needs to mention "page", not "folio". >=20 Neil, I have a question about the above statement. In Linus's tree as of this morning (v6.8-rc7-ish), it does this in nfs_writepages_locked: if (wbc->sync_mode =3D=3D WB_SYNC_NONE && NFS_SERVER(inode)->write_congested) =20 return AOP_WRITEPAGE_ACTIVATE; The only caller of nfs_writepages_locked, and I don't see where it redirties the page. Why don't we need this in v6.8? > Reported-and-tested-by: Jacek Tomaka > Fixes: 6df25e58532b ("nfs: remove reliance on bdi congestion") > Signed-off-by: NeilBrown > --- > fs/nfs/write.c | 4 +++- > 1 file changed, 3 insertions(+), 1 deletion(-) >=20 > diff --git a/fs/nfs/write.c b/fs/nfs/write.c > index b664caea8b4e..9e345d3c305a 100644 > --- a/fs/nfs/write.c > +++ b/fs/nfs/write.c > @@ -668,8 +668,10 @@ static int nfs_writepage_locked(struct folio *folio, > int err; > =20 > if (wbc->sync_mode =3D=3D WB_SYNC_NONE && > - NFS_SERVER(inode)->write_congested) > + NFS_SERVER(inode)->write_congested) { > + folio_redirty_for_writepage(wbc, folio); > return AOP_WRITEPAGE_ACTIVATE; > + } > =20 > nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGE); > nfs_pageio_init_write(&pgio, inode, 0, false, --=20 Jeff Layton