kernel/linux.git/block/bdev.c, branch v7.3-rc1

Merge tag 'for-7.3/block-20260819' of git://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux

2026-08-20T20:55:16+00:00

Pull block updates from Jens Axboe: - NVMe updates via Keith: - Enable Clang context analysis for the nvme host driver, adding context annotations across core, fabrics, rdma, tcp and pci - nvmet reservation state exposed through a new namespace-level debugfs directory, plus ABI documentation for the host sysfs and target configfs interfaces - nvme-tcp host memory disclosure fixes on the read path: reject a read that transferred too few bytes, don't accept C2HData based on blk_rq_payload_bytes() alone, and fix the R2T case for a read command - Parallelize nvme-rdma I/O queue allocation and startup (Surabhi) - Apple nvme fixes and quirks: page aligned admin queue buffers, destroy the admin queue on removal, and various DMA/NVMMU correctness fixes - A large pile of nvmet and host fixes for out-of-bounds reads, refcount/resource leaks, and NULL derefs across auth, zns, passthru, pci-epf, rdma and configfs - Various other fixes and cleanups - MD updates via Yu Kuai: - llbitmap reshape support, the large series wiring exact bitmap mapping and reshape lifecycle through raid5 and raid10, growing the page cache in place, and remapping checkpointed bits as reshape progresses - raid5 fixes for lockless max_nr_stripes and recovery_offset accesses, a reshape deadlock with more failed devices than max degraded, and bitmap batch counter consistency - Atomic write handling for raid1/raid10, and removal of the REQ_NOWAIT support from raid1/10/456 - raid5-ppl use-after-free fix in ppl_do_flush() - A batch of smaller fixes across md core and the bitmap code - s390/dasd ESE full-track write support and the surrounding infrastructure, plus enabling CONTEXT_ANALYSIS for s390/block - RWF_DONTCACHE support for block devices, built on new task-context bio completion infrastructure, and wiring it up for the iomap and buffer dropbehind writeback paths - Async io_uring zone reset all, plus zone management command cleanups allowing REQ_NOWAIT and tightening conventional zone rejection - Block integrity refactoring: lift BIP_CHECK_FLAGS to the shared header, handle nogenerate/noverify properly in fs-integrity, and drop the blk-integrity.h include from bdev.c - Split out a new blk_plug.h header - ublk improvements: add UBLK_F_IO_DESC_SIZE, split request validation from io_desc init, reject non-power-of-2 zone sizes in SET_PARAMS, and a series of hardening fixes around map/unmap and auto buf reg - null_blk cleanups and configfs serialization fixes - nbd queue freeze removal on the setup paths, and a new pre_defined_connections module parameter for pre-created devices - blk-cgroup fixes for the race between policy activation and blkg destruction, and accounting per-cpu stats over possible CPUs across blk-stat, iolatency, iocost and kyber - Various dio fixes: leak on metadata mapping error, validate user space vectors during extraction, and set dma_alignment from the backing file for loop and zloop direct I/O - bio cleanups - Various other fixes and cleanups all over * tag 'for-7.3/block-20260819' of git://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux: (241 commits) nbd: add pre_defined_connections module parameter for pre-created devices nbd: remove queue freeze for newly created nbd from netlink path nbd: factor out a nbd_genl_foreach_sock nbd: skip queue freeze when setting size at device startup nbd: remove queue freeze in nbd_add_socket nbd: clear queue limits on disconnect nbd: disallow NBD_SET_SOCK on an active device nbd: simplify find_fallback() by removing redundant logic blk-mq: add missing call to srcu_barrier() in blk_mq_free_tag_set() block: mtip32xx: synchronize ioctls with device removal ublk: avoid teardown retry loop on xarray allocation failure null_blk: fix UBSAN shift-out-of-bounds when zone_size is 0 or overflows block: don't include blk-integrity.h in bdev.c xfs: avoid double deferrals for RWF_DONTCACHE writes loop: Fix recently introduced lock inversion block: set QUEUE_FLAG_DYING unconditionally in blk_mark_disk_dead() swim3: Add missing MODULE_DESCRIPTION selftests: ublk: add SET_PARAMS validation test selftests: ublk: add helper for SET_PARAMS ublk: reject non-power-of-2 zone sizes in SET_PARAMS ...

block: don't include blk-integrity.h in bdev.c

2026-08-15T23:34:45+00:00

Not needed, probably since this file was split out. Signed-off-by: Christoph Hellwig Reviewed-by: Anuj Gupta Reviewed-by: Bart Van Assche Link: https://patch.msgid.link/20260810144603.453283-1-hch@lst.de Signed-off-by: Jens Axboe

block: reject block device inodes with i_rdev == 0 in lookup_bdev()

2026-07-03T13:12:09+00:00

lookup_bdev() blindly returns inode->i_rdev without validating it. When a FUSE filesystem exposes a root inode with S_IFBLK mode but i_rdev == 0 (via rootmode=060000), any subsequent mount attempt using that path as a block device source propagates dev_t 0 into the superblock machinery. After commit 9ee5f161a4db ("fs: maintain a global device-to-superblock table") this triggers a WARNING in super_dev_register(). Reject i_rdev == 0 early with -ENODEV since no real block device driver registers major 0. Reported-by: syzbot+72fe3ea5814121fbc76e@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=72fe3ea5814121fbc76e Signed-off-by: Yun Zhou Link: https://patch.msgid.link/20260703065548.1135125-1-yun.zhou@windriver.com Signed-off-by: Christian Brauner (Amutable)

block: split bdev_yield_claim() out of bdev_fput()

2026-06-29T08:31:49+00:00

bdev_fput() yields the holder claim and then closes the file, which is a deferred operation. Split the yield half into bdev_yield_claim() so a caller can give up the holder while the file - and therefore the block device - is still open, act on the device, and only then bdev_fput(). A filesystem that made a device unfreezable for a membership change with bdev_deny_freeze() undoes the deny on release with bdev_yield_claim(bdev_file); bdev_allow_freeze(file_bdev(bdev_file)); bdev_fput(bdev_file); Re-allowing only after the holder is yielded avoids stranding the filesystem on a racing freeze, and doing it while the file is still open avoids touching the block device after bdev_fput(). bdev_fput() yields again, which is a no-op once the claim has already been given up. Link: https://patch.msgid.link/20260616-work-super-freeze_deny_upstream-v2-2-b3567c7f994b@kernel.org Reviewed-by: Jan Kara Reviewd-by: Johannes Thumshirn Signed-off-by: Christian Brauner (Amutable)

block: allow making a block device unfreezable

2026-06-29T08:31:49+00:00

Add bdev_deny_freeze() and bdev_allow_freeze(), modeled on deny_write_access()/allow_write_access(). bd_fsfreeze_count becomes a signed counter: > 0 counts active freezes, < 0 counts deniers, and the two regimes are mutually exclusive. bdev_freeze() refuses with -EBUSY while a deny is held, and bdev_deny_freeze() refuses while the device is frozen. A filesystem that mutates a device's membership (a btrfs device add, remove or replace) denies freezing on the device for the duration, so a claim a freeze walk might act on is never added or torn down behind the freezer's back. The deny/allow helpers are a single atomic on bd_fsfreeze_count and take no lock, so they can be called while holding s_umount without inverting against bdev_freeze()'s bd_fsfreeze_mutex -> s_umount order. Reviewed-by: Jan Kara Link: https://patch.msgid.link/20260616-work-super-freeze_deny_upstream-v2-1-b3567c7f994b@kernel.org Signed-off-by: Christian Brauner (Amutable)

block: Avoid mounting the bdev pseudo-filesystem in userspace

2026-05-26T17:01:55+00:00

The bdev pseudo-filesystem is an internal kernel filesystem with which userspace should not interfere. Unregister it so that userspace cannot even attempt to mount it. This fixes a bug [1] that occurs when attempting to access files, because the system call move_mount() uses pointers declared in the inode_operations structure, which for the bdev pseudo-filesystem are always equal to 0. `inode->i_op = &empty_iops;` [1] BUG: kernel NULL pointer dereference, address: 0000000000000000 #PF: supervisor instruction fetch in kernel mode #PF: error_code(0x0010) - not-present page PGD 23380067 P4D 23380067 PUD 23381067 PMD 0 Oops: 0010 [#1] PREEMPT SMP KASAN NOPTI CPU: 2 PID: 17125 Comm: syz-executor.0 Not tainted 6.1.155-syzkaller-00350-g84221fde2681 #0 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 RIP: 0010:0x0 Call Trace: lookup_open.isra.0+0x700/0x1180 fs/namei.c:3460 open_last_lookups fs/namei.c:3550 [inline] path_openat+0x953/0x2700 fs/namei.c:3780 do_filp_open+0x1c5/0x410 fs/namei.c:3810 do_sys_openat2+0x171/0x4d0 fs/open.c:1318 do_sys_open fs/open.c:1334 [inline] __do_sys_openat fs/open.c:1350 [inline] __se_sys_openat fs/open.c:1345 [inline] __x64_sys_openat+0x13c/0x1f0 fs/open.c:1345 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x35/0x80 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x6e/0xd8 Found by Linux Verification Center (linuxtesting.org) with Syzkaller. Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Link: https://lore.kernel.org/all/20131010004732.GJ13318@ZenIV.linux.org.uk/T/# Cc: stable@vger.kernel.org Signed-off-by: Denis Arefev Reviewed-by: Christoph Hellwig Link: https://patch.msgid.link/20260521072857.5078-1-arefev@swemel.ru Signed-off-by: Jens Axboe

block: skip sync_blockdev() on surprise removal in bdev_mark_dead()

2026-05-26T17:01:54+00:00

bdev_mark_dead()'s @surprise == true means the device is already gone. The filesystem callback fs_bdev_mark_dead() honours this and skips sync_filesystem(), but the bare block device path (no ->mark_dead op) lost its !surprise guard when the holder ->mark_dead callback was wired up (see Fixes), and now calls sync_blockdev() unconditionally, which can hang forever waiting on writeback that can no longer complete. syzkaller hit this via nvme_reset_work()'s "I/O queues lost" path: nvme_mark_namespaces_dead() -> blk_mark_disk_dead() -> bdev_mark_dead(bdev, true) -> sync_blockdev() blocks in folio_wait_writeback(), wedging the reset worker and every task waiting on it. Skip the sync on surprise removal, matching fs_bdev_mark_dead(); invalidate_bdev() still runs. Orderly removal (surprise == false) is unchanged. Found by FuzzNvme(Syzkaller with FEMU fuzzing framework). Fixes: d8530de5a6e8 ("block: call into the file system for bdev_mark_dead") Acked-by: Sungwoo Kim Acked-by: Dave Tian Acked-by: Weidong Zhu Signed-off-by: Chao Shi Reviewed-by: Christoph Hellwig Link: https://patch.msgid.link/20260522220025.1770388-1-coshi036@gmail.com Signed-off-by: Jens Axboe

bdev: Drop pointless invalidate_inode_buffers() call

2026-03-26T14:03:27+00:00

Nobody is calling mark_buffer_dirty_inode() with internal bdev inode and it doesn't make sense for internal bdev inode to have any metadata buffer heads. Just drop the pointless invalidate_inode_buffers() call and consequently the whole bdev_evict_inode() because generic code takes care of the rest. CC: linux-block@vger.kernel.org Signed-off-by: Jan Kara Link: https://patch.msgid.link/20260326095354.16340-47-jack@suse.cz Signed-off-by: Christian Brauner

block: remove redundant kill_bdev() call in set_blocksize()

2026-02-04T16:28:18+00:00

The second kill_bdev() call in set_blocksize() is redundant as the first call already clears all buffers and pagecache, and locks prevent new pagecache creation between the calls. Signed-off-by: Yang Xiuwei Reviewed-by: Christoph Hellwig Signed-off-by: Jens Axboe

Merge tag 'vfs-6.19-rc1.inode' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs

2025-12-01T17:02:34+00:00

Pull vfs inode updates from Christian Brauner: "Features: - Hide inode->i_state behind accessors. Open-coded accesses prevent asserting they are done correctly. One obvious aspect is locking, but significantly more can be checked. For example it can be detected when the code is clearing flags which are already missing, or is setting flags when it is illegal (e.g., I_FREEING when ->i_count > 0) - Provide accessors for ->i_state, converts all filesystems using coccinelle and manual conversions (btrfs, ceph, smb, f2fs, gfs2, overlayfs, nilfs2, xfs), and makes plain ->i_state access fail to compile - Rework I_NEW handling to operate without fences, simplifying the code after the accessor infrastructure is in place Cleanups: - Move wait_on_inode() from writeback.h to fs.h - Spell out fenced ->i_state accesses with explicit smp_wmb/smp_rmb for clarity - Cosmetic fixes to LRU handling - Push list presence check into inode_io_list_del() - Touch up predicts in __d_lookup_rcu() - ocfs2: retire ocfs2_drop_inode() and I_WILL_FREE usage - Assert on ->i_count in iput_final() - Assert ->i_lock held in __iget() Fixes: - Add missing fences to I_NEW handling" * tag 'vfs-6.19-rc1.inode' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs: (22 commits) dcache: touch up predicts in __d_lookup_rcu() fs: push list presence check into inode_io_list_del() fs: cosmetic fixes to lru handling fs: rework I_NEW handling to operate without fences fs: make plain ->i_state access fail to compile xfs: use the new ->i_state accessors nilfs2: use the new ->i_state accessors overlayfs: use the new ->i_state accessors gfs2: use the new ->i_state accessors f2fs: use the new ->i_state accessors smb: use the new ->i_state accessors ceph: use the new ->i_state accessors btrfs: use the new ->i_state accessors Manual conversion to use ->i_state accessors of all places not covered by coccinelle Coccinelle-based conversion to use ->i_state accessors fs: provide accessors for ->i_state fs: spell out fenced ->i_state accesses with explicit smp_wmb/smp_rmb fs: move wait_on_inode() from writeback.h to fs.h fs: add missing fences to I_NEW handling ocfs2: retire ocfs2_drop_inode() and I_WILL_FREE usage ...