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Tue, 1 Jul 2025 05:32:56 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id bcXrIghzY2hEYQAAD6G6ig (envelope-from ); Tue, 01 Jul 2025 05:32:56 +0000 From: Qu Wenruo To: linux-btrfs@vger.kernel.org, linux-fsdevel@vger.kernel.org Cc: viro@zeniv.linux.org.uk, brauner@kernel.org, jack@suse.cz Subject: [PATCH v2 0/6] btrfs: add remove_bdev() callback Date: Tue, 1 Jul 2025 15:02:33 +0930 Message-ID: X-Mailer: git-send-email 2.50.0 Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspamd2.dmz-prg2.suse.org X-Rspamd-Queue-Id: 8B30921162 X-Rspamd-Action: no action X-Spam-Flag: NO X-Spamd-Result: default: False [-3.01 / 50.00]; BAYES_HAM(-3.00)[100.00%]; MID_CONTAINS_FROM(1.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; R_MISSING_CHARSET(0.50)[]; R_DKIM_ALLOW(-0.20)[suse.com:s=susede1]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; MX_GOOD(-0.01)[]; FUZZY_BLOCKED(0.00)[rspamd.com]; ARC_NA(0.00)[]; MIME_TRACE(0.00)[0:+]; SPAMHAUS_XBL(0.00)[2a07:de40:b281:104:10:150:64:97:from]; RCVD_VIA_SMTP_AUTH(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.com:dkim,suse.com:mid]; DNSWL_BLOCKED(0.00)[2a07:de40:b281:104:10:150:64:97:from,2a07:de40:b281:106:10:150:64:167:received]; DKIM_SIGNED(0.00)[suse.com:s=susede1]; FROM_EQ_ENVFROM(0.00)[]; FROM_HAS_DN(0.00)[]; RCPT_COUNT_FIVE(0.00)[5]; RCVD_TLS_ALL(0.00)[]; TO_DN_NONE(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; TO_MATCH_ENVRCPT_ALL(0.00)[]; DKIM_TRACE(0.00)[suse.com:+] X-Spam-Score: -3.01 X-Spam-Level: [CHANGELOG] v2: - Enhance and rename shutdown() callback Rename it to remove_bdev() and add a @bdev parameter. For the existing call backs in filesystems, keep their callback function names, now something like ".remove_bdev = ext4_shutdown," will be a quick indicator of the behavior. - Remove the @surprise parameter for the remove_bdev() parameter. The fs_bdev_mark_dead() is already trying to sync the fs if it's not a surprise removal. So there isn't much a filesystem can do with the @surprise parameter. - Fix btrfs error handling when the devices are not opened There are several cases that the fs_devices is not opened, including: * sget_fc() failure * an existing super block is returned * a new super block is returned but btrfS_open_fs_devices() failed Handle the error properly so that fs_devices is not freed twice. RFC->v1: - Add a new remove_bdev() callback Thanks all the feedback from Christian, Christoph and Jan on this new name. - Add a @surprise parameter to the remove_bdev() callback To keep it the same as the bdev_mark_dead(). - Hide the shutdown ioctl and remove_bdev callback behind experimental With the shutdown ioctl, there are at least 2 test failures (g/388, g/508). G/388 is related to the error handling with COW fixup. G/508 looks like something related to log replay. And the remove_bdev() doesn't have any btrfs specific test case yet to check the auto-degraded behavior, nor the auto-degraded behavior is fully discussed. So hide both of them behind experimental features. - Do not use btrfs_handle_fs_error() to avoid freeze/thaw behavior change btrfs_handle_fs_error() will flips the fs read-only, which will affect freeze/thaw behavior. And no other fs set the fs read-only when shutting down, so follow the other fs to have a more consistent behavior. Qu Wenruo (6): fs: enhance and rename shutdown() callback to remove_bdev() btrfs: introduce a new fs state, EMERGENCY_SHUTDOWN btrfs: reject file operations if in shutdown state btrfs: reject delalloc ranges if in shutdown state btrfs: implement shutdown ioctl btrfs: implement remove_bdev super operation callback fs/btrfs/file.c | 25 ++++++++++++++++++++- fs/btrfs/fs.h | 28 ++++++++++++++++++++++++ fs/btrfs/inode.c | 14 +++++++++++- fs/btrfs/ioctl.c | 43 ++++++++++++++++++++++++++++++++++++ fs/btrfs/messages.c | 1 + fs/btrfs/reflink.c | 3 +++ fs/btrfs/super.c | 45 ++++++++++++++++++++++++++++++++++++++ fs/btrfs/volumes.c | 2 ++ fs/btrfs/volumes.h | 5 +++++ fs/exfat/super.c | 4 ++-- fs/ext4/super.c | 4 ++-- fs/f2fs/super.c | 4 ++-- fs/ntfs3/super.c | 4 ++-- fs/super.c | 4 ++-- fs/xfs/xfs_super.c | 5 +++-- include/linux/fs.h | 7 +++++- include/uapi/linux/btrfs.h | 9 ++++++++ 17 files changed, 192 insertions(+), 15 deletions(-) -- 2.50.0