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Wong" , Benjamin Coddington , linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, v9fs@lists.linux.dev, linux-afs@lists.infradead.org, linux-btrfs@vger.kernel.org, ceph-devel@vger.kernel.org, codalist@telemann.coda.cs.cmu.edu, ecryptfs@vger.kernel.org, linux-erofs@lists.ozlabs.org, linux-ext4@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, cluster-devel@redhat.com, linux-nfs@vger.kernel.org, ntfs3@lists.linux.dev, ocfs2-devel@lists.linux.dev, devel@lists.orangefs.org, linux-cifs@vger.kernel.org, samba-technical@lists.samba.org, linux-mtd@lists.infradead.org, linux-mm@kvack.org, linux-unionfs@vger.kernel.org, linux-xfs@vger.kernel.org Date: Wed, 09 Aug 2023 18:07:29 -0400 In-Reply-To: <87a5v06kij.fsf@mail.parknet.co.jp> References: <20230807-mgctime-v7-0-d1dec143a704@kernel.org> <20230807-mgctime-v7-5-d1dec143a704@kernel.org> <87msz08vc7.fsf@mail.parknet.co.jp> <52bead1d6a33fec89944b96e2ec20d1ea8747a9a.camel@kernel.org> <878rak8hia.fsf@mail.parknet.co.jp> <20230809150041.452w7gucjmvjnvbg@quack3> <87v8do6y8q.fsf@mail.parknet.co.jp> <2cb998ff14ace352a9dd553e82cfa0aa92ec09ce.camel@kernel.org> <87leek6rh1.fsf@mail.parknet.co.jp> <87h6p86p9z.fsf@mail.parknet.co.jp> <87a5v06kij.fsf@mail.parknet.co.jp> Content-Type: text/plain; charset="ISO-8859-15" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.48.4 (3.48.4-1.fc38) MIME-Version: 1.0 X-Rspamd-Queue-Id: E5E3A2000B X-Rspam-User: X-Stat-Signature: 91hri8cro5gbsi8mgiobj1japdz7itga X-Rspamd-Server: rspam03 X-HE-Tag: 1691618858-836046 X-HE-Meta: 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 Otjso7tO uImAQ2zy8AKEOFTCrkVqYI8enR8+QdAvA/H88yEZonIPXwseRCC30cBywJb7ZJfv5M5kC3eZGLHOK7zAGxzI0ds2x/6mxWuMRzfLl5/SWVZSiJV4QPYnMVX2+80s2UYwlEiNO7veo4UssvEzWzwocLkdDRh4thDuBnGqsjWzrV9XCDAt2/q7abohtXx6ilkmih+lqLVZTlDriJldEW9PL31lEB010bKbhPJGgl+5qH8McHjOBCaDl8r7kLw/1svURUNXuvABBBC9SUgqXCjOoC6Ib6nnBwgybNAgSr02qTjkQTLA4hdH9dkx8U05EoA8fUqx8sSX/V/aYUptEnPDmr5QrpMU4QjKkNA5TznrbnOEZbs65UiebZ/tIzcIj2F2c+GN9PgMyYRFjcXE= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Thu, 2023-08-10 at 05:14 +0900, OGAWA Hirofumi wrote: > Jeff Layton writes: >=20 > > When you say it "doesn't work the same", what do you mean, specifically= ? > > I had to make some allowances for the fact that FAT is substantially > > different in its timestamp handling, and I tried to preserve existing > > behavior as best I could. >=20 > Ah, ok. I was misreading some. >=20 > inode_update_timestamps() checks IS_I_VERSION() now, not S_VERSION. So, > if adding the check of IS_I_VERSION() and (S_MTIME|S_CTIME|S_VERSION) to > FAT? >=20 > With it, IS_I_VERSION() would be false on FAT, and I'm fine. >=20 > I.e. something like >=20 > if ((flags & (S_VERSION|S_CTIME|S_MTIME)) && IS_I_VERSION(inode) > && inode_maybe_inc_iversion(inode, false)) > dirty_flags |=3D I_DIRTY_SYNC; >=20 > Thanks. If you do that then the i_version counter would never be incremented. But...I think I see what you're getting at. Most filesystems that support the i_version counter have an on-disk field for it. FAT obviously has no such thing. I suspect the i_version bits in fat_update_time were added by mistake. FAT doesn't set SB_I_VERSION so there's no need to do anything to the i_version field at all. Also, given that the mtime and ctime are always kept in sync on FAT, we're probably fine to have it look something like this: --------------------8<------------------ int fat_update_time(struct inode *inode, int flags)=20 {=20 int dirty_flags =3D 0; if (inode->i_ino =3D=3D MSDOS_ROOT_INO)=20 return 0; fat_truncate_time(inode, NULL, flags); if (inode->i_sb->s_flags & SB_LAZYTIME) dirty_flags |=3D I_DIRTY_TIME; else dirty_flags |=3D I_DIRTY_SYNC; __mark_inode_dirty(inode, dirty_flags); return 0; }=20 --------------------8<------------------ ...and we should probably do that in a separate patch in advance of the update_time rework, since it's really a different change. If you're in agreement, then I'll plan to respin the series with this fixed and resend. Thanks for being patient! --=20 Jeff Layton