linux.git/block/ioctl.c, branch master

block: implement async io_uring zone reset all

2026-08-04T12:55:31+00:00

Add a new BLOCK_URING_CMD_ZONE_RESET_ALL uring cmd to reset all zones for a given block device. This can be used by storage systems or file system mkfs tools to initialize multiple devices in parallel. Signed-off-by: Christoph Hellwig Reviewed-by: Damien Le Moal Link: https://patch.msgid.link/20260804125038.740388-7-hch@lst.de Signed-off-by: Jens Axboe

block: remove most blkdev_cmd_discard arguments

2026-08-04T12:55:31+00:00

All other arguments can be derived from cmd, so do that to simplify the calling convention. Signed-off-by: Christoph Hellwig Reviewed-by: Damien Le Moal Link: https://patch.msgid.link/20260804125038.740388-6-hch@lst.de Signed-off-by: Jens Axboe

block: fix IORING_URING_CMD_REISSUE flags check in blkdev_uring_cmd

2026-06-16T15:56:38+00:00

blkdev_uring_cmd() checks IORING_URING_CMD_REISSUE to determine whether this is the first issue. However, this flag lives in cmd->flags instead of issue_flags. Coincidentally, IO_URING_F_NONBLOCK shares bit 31 with IORING_URING_CMD_REISSUE. As a result, the SQE read was never performed, bic->len remained zero, and every BLOCK_URING_CMD_DISCARD failed with -EINVAL. Fix it by checking cmd->flags as intended. Cc: stable@vger.kernel.org Fixes: 212ec34e4e72 ("block: only read from sqe on initial invocation of blkdev_uring_cmd") Signed-off-by: Yitang Yang Link: https://patch.msgid.link/20260616155129.406057-1-yi1tang.yang@gmail.com Signed-off-by: Jens Axboe

block: only read from sqe on initial invocation of blkdev_uring_cmd()

2026-05-05T07:37:12+00:00

This passthrough helper currently only supports discards. Part of that command is the start and length, which is read from the SQE. It does so on every invocation, where it really should just make it stable on the first invocation. This avoids needing to copy the SQE upfront, as we only really need those two 8b values stored in our per-req payload. Cc: stable@vger.kernel.org # 6.17+ Signed-off-by: Jens Axboe

block: add a bio_submit_or_kill helper

2026-04-07T14:22:24+00:00

Factor the common logic for the ioctl helpers to either submit a bio or end if the process is being killed. As this is now the only user of bio_await_chain, open code that. Signed-off-by: Christoph Hellwig Reviewed-by: Damien Le Moal Link: https://patch.msgid.link/20260407140538.633364-5-hch@lst.de Signed-off-by: Jens Axboe

block: allow IOC_PR_READ_* ioctls with BLK_OPEN_READ

2026-02-11T17:36:54+00:00

The recently added IOC_PR_READ_* ioctls require the same BLK_OPEN_WRITE permission as the older persistent reservation ioctls. This has the drawback that udev triggers when the file descriptor is closed, resulting in unnecessary activity like scanning partitions even though these read-only ioctls do not modify the device. Change IOC_PR_READ_KEYS and IOC_PR_READ_RESERVATION to require BLK_OPEN_READ. This prevents unnecessary activity every time `blkpr --read-keys` or `blkpr --read-reservation` is invoked by shell scripts, for example. It is safe to reduce the permission requirement from BLK_OPEN_WRITE to BLK_OPEN_READ since these two ioctls do not modify the persistent reservation state. Userspace cannot use the information fetched by these ioctls to make changes to the device unless it later opens the device with BLK_OPEN_WRITE. Fixes: 3e2cb9ee76c2 ("block: add IOC_PR_READ_RESERVATION ioctl") Fixes: 22a1ffea5f80 ("block: add IOC_PR_READ_KEYS ioctl") Cc: Christoph Hellwig Cc: Martin Wilck Cc: Benjamin Marzinski Suggested-by: Hannes Reinecke Signed-off-by: Stefan Hajnoczi Reviewed-by: Christoph Hellwig Signed-off-by: Jens Axboe

block: introduce bdev_rot()

2026-01-30T15:11:09+00:00

Introduce the helper function bdev_rot() to test if a block device is a rotational one. The existing function bdev_nonrot() which tests for the opposite condition is redefined using this new helper. This avoids the double negation (operator and name) that appears when testing if a block device is a rotational device, thus making the code a little easier to read. Call sites of bdev_nonrot() in the block layer are updated to use this new helper. Remaining users in other subsystems are left unchanged for now. Signed-off-by: Damien Le Moal Reviewed-by: Johannes Thumshirn Signed-off-by: Jens Axboe

block: add allocation size check in blkdev_pr_read_keys()

2025-12-17T14:35:22+00:00

blkdev_pr_read_keys() takes num_keys from userspace and uses it to calculate the allocation size for keys_info via struct_size(). While there is a check for SIZE_MAX (integer overflow), there is no upper bound validation on the allocation size itself. A malicious or buggy userspace can pass a large num_keys value that doesn't trigger overflow but still results in an excessive allocation attempt, causing a warning in the page allocator when the order exceeds MAX_PAGE_ORDER. Fix this by introducing PR_KEYS_MAX to limit the number of keys to a sane value. This makes the SIZE_MAX check redundant, so remove it. Also switch to kvzalloc/kvfree to handle larger allocations gracefully. Fixes: 22a1ffea5f80 ("block: add IOC_PR_READ_KEYS ioctl") Tested-by: syzbot+660d079d90f8a1baf54d@syzkaller.appspotmail.com Reported-by: syzbot+660d079d90f8a1baf54d@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=660d079d90f8a1baf54d Link: https://lore.kernel.org/all/20251212013510.3576091-1-kartikey406@gmail.com/T/ [v1] Signed-off-by: Deepanshu Kartikey Reviewed-by: Martin K. Petersen Reviewed-by: Stefan Hajnoczi Signed-off-by: Jens Axboe

block: add IOC_PR_READ_RESERVATION ioctl

2025-12-04T14:19:26+00:00

Add a Persistent Reservations ioctl to read the current reservation. This calls the pr_ops->read_reservation() function that was previously added in commit c787f1baa503 ("block: Add PR callouts for read keys and reservation") but was only used by the in-kernel SCSI target so far. The IOC_PR_READ_RESERVATION ioctl is necessary so that userspace applications that rely on Persistent Reservations ioctls have a way of inspecting the current state. Cluster managers and validation tests need this functionality. Signed-off-by: Stefan Hajnoczi Reviewed-by: Hannes Reinecke Reviewed-by: Christoph Hellwig Reviewed-by: Martin K. Petersen Signed-off-by: Jens Axboe

block: add IOC_PR_READ_KEYS ioctl

2025-12-04T14:19:26+00:00

Add a Persistent Reservations ioctl to read the list of currently registered reservation keys. This calls the pr_ops->read_keys() function that was previously added in commit c787f1baa503 ("block: Add PR callouts for read keys and reservation") but was only used by the in-kernel SCSI target so far. The IOC_PR_READ_KEYS ioctl is necessary so that userspace applications that rely on Persistent Reservations ioctls have a way of inspecting the current state. Cluster managers and validation tests need this functionality. Signed-off-by: Stefan Hajnoczi Reviewed-by: Christoph Hellwig Reviewed-by: Martin K. Petersen Signed-off-by: Jens Axboe