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[49.180.184.88]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-b3918d81a3fsm4275006a12.15.2025.07.07.22.05.39 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 07 Jul 2025 22:05:39 -0700 (PDT) Received: from dave by dread.disaster.area with local (Exim 4.98.2) (envelope-from ) id 1uZ0WP-00000008J2c-0q8k; Tue, 08 Jul 2025 15:05:37 +1000 Date: Tue, 8 Jul 2025 15:05:37 +1000 From: Dave Chinner To: Qu Wenruo Cc: "Darrick J. Wong" , Qu Wenruo , linux-btrfs@vger.kernel.org, linux-fsdevel@vger.kernel.org, viro@zeniv.linux.org.uk, brauner@kernel.org, jack@suse.cz, linux-ext4@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, ntfs3@lists.linux.dev, linux-xfs@vger.kernel.org Subject: Re: [PATCH v4 1/6] fs: enhance and rename shutdown() callback to remove_bdev() Message-ID: References: <20250708004532.GA2672018@frogsfrogsfrogs> <02584a40-a2c0-4565-ab46-50c1a4100b21@gmx.com> Precedence: bulk X-Mailing-List: linux-btrfs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: On Tue, Jul 08, 2025 at 12:36:48PM +0930, Qu Wenruo wrote: > 在 2025/7/8 11:39, Qu Wenruo 写道: > > 在 2025/7/8 10:15, Darrick J. Wong 写道: > > > > Yes, the naming is not perfect and mixing cause and action, but the end > > > > result is still a more generic and less duplicated code base. > > > > > > I think dchinner makes a good point that if your filesystem can do > > > something clever on device removal, it should provide its own block > > > device holder ops instead of using fs_holder_ops. > > > > Then re-implement a lot of things like bdev_super_lock()? IDGI. Simply add: EXPORT_SYMBOL_GPL(get_bdev_super); And the problem is solved. > > I'd prefer not. > > > > > > fs_holder_ops solves a lot of things like handling mounting/inactive > > fses, and pushing it back again to the fs code is just causing more > > duplication. This is all encapsulated in get_bdev_super(), so btrfs doesn't need to implement any of this. get_bdev_super/deactivate_super is the API you should be using with the blk_holder_ops methods. > > Not really worthy if we only want a single different behavior. This is the *3rd* different behaviour for ->mark_dead. We have the generic behaviour, the bcachefs behaviour, and now the btrfs behaviour (whatever that may be). > > Thus I strongly prefer to do with the existing fs_holder_ops, no matter > > if it's using/renaming the shutdown() callback, or a new callback. > > Previously Christoph is against a new ->remove_bdev() callback, as it is > conflicting with the existing ->shutdown(). > > So what about a new ->handle_bdev_remove() callback, that we do something > like this inside fs_bdev_mark_dead(): > > { > bdev_super_lock(); > if (!surprise) > sync_filesystem(); > > if (s_op->handle_bdev_remove) { > ret = s_op->handle_bdev_remove(); > if (!ret) { > super_unlock_shared(); > return; > } > } > shrink_dcache_sb(); > evict_inodes(); > if (s_op->shutdown) > s_op->shutdown(); > } > > So that the new ->handle_bdev_remove() is not conflicting with > ->shutdown() but an optional one. > > And if the fs can not handle the removal, just let > ->handle_bdev_remove() return an error so that we fallback to the existing > shutdown routine. > > Would this be more acceptable? 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[49.180.184.88]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-b3918d81a3fsm4275006a12.15.2025.07.07.22.05.39 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 07 Jul 2025 22:05:39 -0700 (PDT) Received: from dave by dread.disaster.area with local (Exim 4.98.2) (envelope-from ) id 1uZ0WP-00000008J2c-0q8k; Tue, 08 Jul 2025 15:05:37 +1000 Date: Tue, 8 Jul 2025 15:05:37 +1000 To: Qu Wenruo Message-ID: References: <20250708004532.GA2672018@frogsfrogsfrogs> <02584a40-a2c0-4565-ab46-50c1a4100b21@gmx.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: X-Headers-End: 1uZ0sl-0001gr-PK Subject: Re: [f2fs-dev] [PATCH v4 1/6] fs: enhance and rename shutdown() callback to remove_bdev() X-BeenThere: linux-f2fs-devel@lists.sourceforge.net X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , From: Dave Chinner via Linux-f2fs-devel Reply-To: Dave Chinner Cc: brauner@kernel.org, ntfs3@lists.linux.dev, jack@suse.cz, "Darrick J. Wong" , linux-f2fs-devel@lists.sourceforge.net, linux-xfs@vger.kernel.org, Qu Wenruo , linux-fsdevel@vger.kernel.org, linux-ext4@vger.kernel.org, linux-btrfs@vger.kernel.org, viro@zeniv.linux.org.uk Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Errors-To: linux-f2fs-devel-bounces@lists.sourceforge.net T24gVHVlLCBKdWwgMDgsIDIwMjUgYXQgMTI6MzY6NDhQTSArMDkzMCwgUXUgV2VucnVvIHdyb3Rl Ogo+IOWcqCAyMDI1LzcvOCAxMTozOSwgUXUgV2VucnVvIOWGmemBkzoKPiA+IOWcqCAyMDI1Lzcv OCAxMDoxNSwgRGFycmljayBKLiBXb25nIOWGmemBkzoKPiA+ID4gPiBZZXMsIHRoZSBuYW1pbmcg aXMgbm90IHBlcmZlY3QgYW5kIG1peGluZyBjYXVzZSBhbmQgYWN0aW9uLCBidXQgdGhlIGVuZAo+ ID4gPiA+IHJlc3VsdCBpcyBzdGlsbCBhIG1vcmUgZ2VuZXJpYyBhbmQgbGVzcyBkdXBsaWNhdGVk IGNvZGUgYmFzZS4KPiA+ID4gCj4gPiA+IEkgdGhpbmsgZGNoaW5uZXIgbWFrZXMgYSBnb29kIHBv aW50IHRoYXQgaWYgeW91ciBmaWxlc3lzdGVtIGNhbiBkbwo+ID4gPiBzb21ldGhpbmcgY2xldmVy IG9uIGRldmljZSByZW1vdmFsLCBpdCBzaG91bGQgcHJvdmlkZSBpdHMgb3duIGJsb2NrCj4gPiA+ IGRldmljZSBob2xkZXIgb3BzIGluc3RlYWQgb2YgdXNpbmcgZnNfaG9sZGVyX29wcy4KPiA+IAo+ ID4gVGhlbiByZS1pbXBsZW1lbnQgYSBsb3Qgb2YgdGhpbmdzIGxpa2UgYmRldl9zdXBlcl9sb2Nr KCk/CgpJREdJLiBTaW1wbHkgYWRkOgoKRVhQT1JUX1NZTUJPTF9HUEwoZ2V0X2JkZXZfc3VwZXIp OwoKQW5kIHRoZSBwcm9ibGVtIGlzIHNvbHZlZC4KCj4gPiBJJ2QgcHJlZmVyIG5vdC4KPiA+IAo+ ID4gCj4gPiBmc19ob2xkZXJfb3BzIHNvbHZlcyBhIGxvdCBvZiB0aGluZ3MgbGlrZSBoYW5kbGlu ZyBtb3VudGluZy9pbmFjdGl2ZQo+ID4gZnNlcywgYW5kIHB1c2hpbmcgaXQgYmFjayBhZ2FpbiB0 byB0aGUgZnMgY29kZSBpcyBqdXN0IGNhdXNpbmcgbW9yZQo+ID4gZHVwbGljYXRpb24uCgpUaGlz IGlzIGFsbCBlbmNhcHN1bGF0ZWQgaW4gZ2V0X2JkZXZfc3VwZXIoKSwgc28gYnRyZnMgZG9lc24n dCBuZWVkCnRvIGltcGxlbWVudCBhbnkgb2YgdGhpcy4gZ2V0X2JkZXZfc3VwZXIvZGVhY3RpdmF0 ZV9zdXBlciBpcyB0aGUgQVBJCnlvdSBzaG91bGQgYmUgdXNpbmcgd2l0aCB0aGUgYmxrX2hvbGRl cl9vcHMgbWV0aG9kcy4KCj4gPiBOb3QgcmVhbGx5IHdvcnRoeSBpZiB3ZSBvbmx5IHdhbnQgYSBz aW5nbGUgZGlmZmVyZW50IGJlaGF2aW9yLgoKVGhpcyBpcyB0aGUgKjNyZCogZGlmZmVyZW50IGJl aGF2aW91ciBmb3IgLT5tYXJrX2RlYWQuIFdlCmhhdmUgdGhlIGdlbmVyaWMgYmVoYXZpb3VyLCB0 aGUgYmNhY2hlZnMgYmVoYXZpb3VyLCBhbmQgbm93IHRoZQpidHJmcyBiZWhhdmlvdXIgKHdoYXRl dmVyIHRoYXQgbWF5IGJlKS4KCj4gPiBUaHVzIEkgc3Ryb25nbHkgcHJlZmVyIHRvIGRvIHdpdGgg dGhlIGV4aXN0aW5nIGZzX2hvbGRlcl9vcHMsIG5vIG1hdHRlcgo+ID4gaWYgaXQncyB1c2luZy9y ZW5hbWluZyB0aGUgc2h1dGRvd24oKSBjYWxsYmFjaywgb3IgYSBuZXcgY2FsbGJhY2suCj4gCj4g UHJldmlvdXNseSBDaHJpc3RvcGggaXMgYWdhaW5zdCBhIG5ldyAtPnJlbW92ZV9iZGV2KCkgY2Fs bGJhY2ssIGFzIGl0IGlzCj4gY29uZmxpY3Rpbmcgd2l0aCB0aGUgZXhpc3RpbmcgLT5zaHV0ZG93 bigpLgo+IAo+IFNvIHdoYXQgYWJvdXQgYSBuZXcgLT5oYW5kbGVfYmRldl9yZW1vdmUoKSBjYWxs YmFjaywgdGhhdCB3ZSBkbyBzb21ldGhpbmcKPiBsaWtlIHRoaXMgaW5zaWRlIGZzX2JkZXZfbWFy a19kZWFkKCk6Cj4gCj4gewo+IAliZGV2X3N1cGVyX2xvY2soKTsKPiAJaWYgKCFzdXJwcmlzZSkK PiAJCXN5bmNfZmlsZXN5c3RlbSgpOwo+IAo+IAlpZiAoc19vcC0+aGFuZGxlX2JkZXZfcmVtb3Zl KSB7Cj4gCQlyZXQgPSBzX29wLT5oYW5kbGVfYmRldl9yZW1vdmUoKTsKPiAJCWlmICghcmV0KSB7 Cj4gCQkJc3VwZXJfdW5sb2NrX3NoYXJlZCgpOwo+IAkJCXJldHVybjsKPiAJCX0KPiAJfQo+IAlz aHJpbmtfZGNhY2hlX3NiKCk7Cj4gCWV2aWN0X2lub2RlcygpOwo+IAlpZiAoc19vcC0+c2h1dGRv d24pCj4gCQlzX29wLT5zaHV0ZG93bigpOwo+IH0KPiAKPiBTbyB0aGF0IHRoZSBuZXcgLT5oYW5k bGVfYmRldl9yZW1vdmUoKSBpcyBub3QgY29uZmxpY3Rpbmcgd2l0aAo+IC0+c2h1dGRvd24oKSBi dXQgYW4gb3B0aW9uYWwgb25lLgo+IAo+IEFuZCBpZiB0aGUgZnMgY2FuIG5vdCBoYW5kbGUgdGhl IHJlbW92YWwsIGp1c3QgbGV0Cj4gLT5oYW5kbGVfYmRldl9yZW1vdmUoKSByZXR1cm4gYW4gZXJy b3Igc28gdGhhdCB3ZSBmYWxsYmFjayB0byB0aGUgZXhpc3RpbmcKPiBzaHV0ZG93biByb3V0aW5l Lgo+IAo+IFdvdWxkIHRoaXMgYmUgbW9yZSBhY2NlcHRhYmxlPwoKTm8uCgotRGF2ZS4KLS0gCkRh dmUgQ2hpbm5lcgpkYXZpZEBmcm9tb3JiaXQuY29tCgoKX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX18KTGludXgtZjJmcy1kZXZlbCBtYWlsaW5nIGxpc3QKTGlu dXgtZjJmcy1kZXZlbEBsaXN0cy5zb3VyY2Vmb3JnZS5uZXQKaHR0cHM6Ly9saXN0cy5zb3VyY2Vm b3JnZS5uZXQvbGlzdHMvbGlzdGluZm8vbGludXgtZjJmcy1kZXZlbAo=