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Pull more block updates from Jens Axboe:
"Followup block updates, mostly due to NVMe being a bit late to the
party. But nothing major in there, so not a big deal.
In detail, this contains:
- NVMe pull request via Keith:
- Fabrics connection retries (Daniel, Hannes)
- Fabrics logging enhancements (Tokunori)
- RDMA delete optimization (Sagi)
- ublk DMA alignment fix (me)
- null_blk sparse warning fixes (Bart)
- Discard support for brd (Keith)
- blk-cgroup list corruption fixes (Ming)
- blk-cgroup stat propagation fix (Waiman)
- Regression fix for plugging stall with md (Yu)
- Misc fixes or cleanups (David, Jeff, Justin)"
* tag 'block-6.10-20240523' of git://git.kernel.dk/linux: (24 commits)
null_blk: fix null-ptr-dereference while configuring 'power' and 'submit_queues'
blk-throttle: remove unused struct 'avg_latency_bucket'
block: fix lost bio for plug enabled bio based device
block: t10-pi: add MODULE_DESCRIPTION()
blk-mq: add helper for checking if one CPU is mapped to specified hctx
blk-cgroup: Properly propagate the iostat update up the hierarchy
blk-cgroup: fix list corruption from reorder of WRITE ->lqueued
blk-cgroup: fix list corruption from resetting io stat
cdrom: rearrange last_media_change check to avoid unintentional overflow
nbd: Fix signal handling
nbd: Remove a local variable from nbd_send_cmd()
nbd: Improve the documentation of the locking assumptions
nbd: Remove superfluous casts
nbd: Use NULL to represent a pointer
brd: implement discard support
null_blk: Fix two sparse warnings
ublk_drv: set DMA alignment mask to 3
nvme-rdma, nvme-tcp: include max reconnects for reconnect logging
nvmet-rdma: Avoid o(n^2) loop in delete_ctrl
nvme: do not retry authentication failures
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'avg_latency_bucket' is unused since
commit bf20ab538c81 ("blk-throttle: remove
CONFIG_BLK_DEV_THROTTLING_LOW")
Remove it.
Signed-off-by: Dr. David Alan Gilbert <linux@treblig.org>
Link: https://lore.kernel.org/r/20240522172458.334173-1-linux@treblig.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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With the following two conditions, bio will be lost:
1) blk plug is not enabled, for example, __blkdev_direct_IO_simple() and
__blkdev_direct_IO_async();
2) bio plug is enabled, for example write IO for raid1/raid10 while
bitmap is enabled;
Root cause is that blk_finish_plug() will add the bio to
curent->bio_list, while such bio will not be handled:
__submit_bio_noacct
current->bio_list = bio_list_on_stack;
blk_start_plug
do {
dm_submit_bio
md_handle_request
raid10_write_request
-> generate new bio for underlying disks
raid1_add_bio_to_plug -> bio is added to plug
} while ((bio = bio_list_pop(&bio_list_on_stack[0])))
-> previous bio are all handled
blk_finish_plug
raid10_unplug
raid1_submit_write
submit_bio_noacct
if (current->bio_list)
bio_list_add(¤t->bio_list[0], bio)
-> add new bio
current->bio_list = NULL
-> new bio is lost
Fix the problem by moving the plug into the while loop, so that
current->bio_list will still be handled after blk_finish_plug().
By the way, enable plug for raid1/raid10 in this case will also prevent
delay IO handling into daemon thread, which should also improve IO
performance.
Fixes: 060406c61c7c ("block: add plug while submitting IO")
Reported-by: Changhui Zhong <czhong@redhat.com>
Closes: https://lore.kernel.org/all/CAGVVp+Xsmzy2G9YuEatfMT6qv1M--YdOCQ0g7z7OVmcTbBxQAg@mail.gmail.com/
Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Tested-by: Changhui Zhong <czhong@redhat.com>
Link: https://lore.kernel.org/r/20240521200308.983986-1-yukuai1@huaweicloud.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Pull bdev flags update from Al Viro:
"Compactifying bdev flags.
We can easily have up to 24 flags with sane atomicity, _without_
pushing anything out of the first cacheline of struct block_device"
* tag 'pull-bd_flags-2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
bdev: move ->bd_make_it_fail to ->__bd_flags
bdev: move ->bd_ro_warned to ->__bd_flags
bdev: move ->bd_has_subit_bio to ->__bd_flags
bdev: move ->bd_write_holder into ->__bd_flags
bdev: move ->bd_read_only to ->__bd_flags
bdev: infrastructure for flags
wrapper for access to ->bd_partno
Use bdev_is_paritition() instead of open-coding it
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git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Pull bdev bd_inode updates from Al Viro:
"Replacement of bdev->bd_inode with sane(r) set of primitives by me and
Yu Kuai"
* tag 'pull-bd_inode-1' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
RIP ->bd_inode
dasd_format(): killing the last remaining user of ->bd_inode
nilfs_attach_log_writer(): use ->bd_mapping->host instead of ->bd_inode
block/bdev.c: use the knowledge of inode/bdev coallocation
gfs2: more obvious initializations of mapping->host
fs/buffer.c: massage the remaining users of ->bd_inode to ->bd_mapping
blk_ioctl_{discard,zeroout}(): we only want ->bd_inode->i_mapping here...
grow_dev_folio(): we only want ->bd_inode->i_mapping there
use ->bd_mapping instead of ->bd_inode->i_mapping
block_device: add a pointer to struct address_space (page cache of bdev)
missing helpers: bdev_unhash(), bdev_drop()
block: move two helpers into bdev.c
block2mtd: prevent direct access of bd_inode
dm-vdo: use bdev_nr_bytes(bdev) instead of i_size_read(bdev->bd_inode)
blkdev_write_iter(): saner way to get inode and bdev
bcachefs: remove dead function bdev_sectors()
ext4: remove block_device_ejected()
erofs_buf: store address_space instead of inode
erofs: switch erofs_bread() to passing offset instead of block number
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git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Pull vfs blocksize updates from Al Viro:
"This gets rid of bogus set_blocksize() uses, switches it over
to be based on a 'struct file *' and verifies that the caller
has the device opened exclusively"
* tag 'pull-set_blocksize' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
make set_blocksize() fail unless block device is opened exclusive
set_blocksize(): switch to passing struct file *
btrfs_get_bdev_and_sb(): call set_blocksize() only for exclusive opens
swsusp: don't bother with setting block size
zram: don't bother with reopening - just use O_EXCL for open
swapon(2): open swap with O_EXCL
swapon(2)/swapoff(2): don't bother with block size
pktcdvd: sort set_blocksize() calls out
bcache_register(): don't bother with set_blocksize()
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Fix the allmodconfig 'make W=1' issue:
WARNING: modpost: missing MODULE_DESCRIPTION() in block/t10-pi.o
Signed-off-by: Jeff Johnson <quic_jjohnson@quicinc.com>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Link: https://lore.kernel.org/r/20240516-md-t10-pi-v1-1-44a3469374aa@quicinc.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Pull non-mm updates from Andrew Morton:
"Mainly singleton patches, documented in their respective changelogs.
Notable series include:
- Some maintenance and performance work for ocfs2 in Heming Zhao's
series "improve write IO performance when fragmentation is high".
- Some ocfs2 bugfixes from Su Yue in the series "ocfs2 bugs fixes
exposed by fstests".
- kfifo header rework from Andy Shevchenko in the series "kfifo:
Clean up kfifo.h".
- GDB script fixes from Florian Rommel in the series "scripts/gdb:
Fixes for $lx_current and $lx_per_cpu".
- After much discussion, a coding-style update from Barry Song
explaining one reason why inline functions are preferred over
macros. The series is "codingstyle: avoid unused parameters for a
function-like macro""
* tag 'mm-nonmm-stable-2024-05-19-11-56' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (62 commits)
fs/proc: fix softlockup in __read_vmcore
nilfs2: convert BUG_ON() in nilfs_finish_roll_forward() to WARN_ON()
scripts: checkpatch: check unused parameters for function-like macro
Documentation: coding-style: ask function-like macros to evaluate parameters
nilfs2: use __field_struct() for a bitwise field
selftests/kcmp: remove unused open mode
nilfs2: remove calls to folio_set_error() and folio_clear_error()
kernel/watchdog_perf.c: tidy up kerneldoc
watchdog: allow nmi watchdog to use raw perf event
watchdog: handle comma separated nmi_watchdog command line
nilfs2: make superblock data array index computation sparse friendly
squashfs: remove calls to set the folio error flag
squashfs: convert squashfs_symlink_read_folio to use folio APIs
scripts/gdb: fix detection of current CPU in KGDB
scripts/gdb: make get_thread_info accept pointers
scripts/gdb: fix parameter handling in $lx_per_cpu
scripts/gdb: fix failing KGDB detection during probe
kfifo: don't use "proxy" headers
media: stih-cec: add missing io.h
media: rc: add missing io.h
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Commit a46c27026da1 ("blk-mq: don't schedule block kworker on isolated CPUs")
rules out isolated CPUs from hctx->cpumask, and hctx->cpumask should only be
used for scheduling kworker.
Add helper blk_mq_cpu_mapped_to_hctx() and apply it into cpuhp handlers.
This patch avoids to forget clearing INACTIVE of hctx state in case that one
isolated CPU becomes online, and fixes hang issue when allocating request
from this hctx's tags.
Cc: Raju Cheerla <rcheerla@redhat.com>
Fixes: a46c27026da1 ("blk-mq: don't schedule block kworker on isolated CPUs")
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Link: https://lore.kernel.org/r/20240517020514.149771-1-ming.lei@redhat.com
Tested-by: Raju Cheerla <rcheerla@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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During a cgroup_rstat_flush() call, the lowest level of nodes are flushed
first before their parents. Since commit 3b8cc6298724 ("blk-cgroup:
Optimize blkcg_rstat_flush()"), iostat propagation was still done to
the parent. Grandparent, however, may not get the iostat update if the
parent has no blkg_iostat_set queued in its lhead lockless list.
Fix this iostat propagation problem by queuing the parent's global
blkg->iostat into one of its percpu lockless lists to make sure that
the delta will always be propagated up to the grandparent and so on
toward the root blkcg.
Note that successive calls to __blkcg_rstat_flush() are serialized by
the cgroup_rstat_lock. So no special barrier is used in the reading
and writing of blkg->iostat.lqueued.
Fixes: 3b8cc6298724 ("blk-cgroup: Optimize blkcg_rstat_flush()")
Reported-by: Dan Schatzberg <schatzberg.dan@gmail.com>
Closes: https://lore.kernel.org/lkml/ZkO6l%2FODzadSgdhC@dschatzberg-fedora-PF3DHTBV/
Signed-off-by: Waiman Long <longman@redhat.com>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Acked-by: Tejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/20240515143059.276677-1-longman@redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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__blkcg_rstat_flush() can be run anytime, especially when blk_cgroup_bio_start
is being executed.
If WRITE of `->lqueued` is re-ordered with READ of 'bisc->lnode.next' in
the loop of __blkcg_rstat_flush(), `next_bisc` can be assigned with one
stat instance being added in blk_cgroup_bio_start(), then the local
list in __blkcg_rstat_flush() could be corrupted.
Fix the issue by adding one barrier.
Cc: Tejun Heo <tj@kernel.org>
Cc: Waiman Long <longman@redhat.com>
Fixes: 3b8cc6298724 ("blk-cgroup: Optimize blkcg_rstat_flush()")
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Link: https://lore.kernel.org/r/20240515013157.443672-3-ming.lei@redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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Since commit 3b8cc6298724 ("blk-cgroup: Optimize blkcg_rstat_flush()"),
each iostat instance is added to blkcg percpu list, so blkcg_reset_stats()
can't reset the stat instance by memset(), otherwise the llist may be
corrupted.
Fix the issue by only resetting the counter part.
Cc: Tejun Heo <tj@kernel.org>
Cc: Waiman Long <longman@redhat.com>
Cc: Jay Shin <jaeshin@redhat.com>
Fixes: 3b8cc6298724 ("blk-cgroup: Optimize blkcg_rstat_flush()")
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Acked-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Waiman Long <longman@redhat.com>
Link: https://lore.kernel.org/r/20240515013157.443672-2-ming.lei@redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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Pull SCSI updates from James Bottomley:
"Updates to the usual drivers (ufs, lpfc, qla2xxx, mpi3mr, libsas).
The major update (which causes a conflict with block, see below) is
Christoph removing the queue limits and their associated block
helpers.
The remaining patches are assorted minor fixes and deprecated function
updates plus a bit of constification"
* tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi: (141 commits)
scsi: mpi3mr: Sanitise num_phys
scsi: lpfc: Copyright updates for 14.4.0.2 patches
scsi: lpfc: Update lpfc version to 14.4.0.2
scsi: lpfc: Add support for 32 byte CDBs
scsi: lpfc: Change lpfc_hba hba_flag member into a bitmask
scsi: lpfc: Introduce rrq_list_lock to protect active_rrq_list
scsi: lpfc: Clear deferred RSCN processing flag when driver is unloading
scsi: lpfc: Update logging of protection type for T10 DIF I/O
scsi: lpfc: Change default logging level for unsolicited CT MIB commands
scsi: target: Remove unused list 'device_list'
scsi: iscsi: Remove unused list 'connlist_err'
scsi: ufs: exynos: Add support for Tensor gs101 SoC
scsi: ufs: exynos: Add some pa_dbg_ register offsets into drvdata
scsi: ufs: exynos: Allow max frequencies up to 267Mhz
scsi: ufs: exynos: Add EXYNOS_UFS_OPT_TIMER_TICK_SELECT option
scsi: ufs: exynos: Add EXYNOS_UFS_OPT_UFSPR_SECURE option
scsi: ufs: dt-bindings: exynos: Add gs101 compatible
scsi: qla2xxx: Fix debugfs output for fw_resource_count
scsi: qedf: Ensure the copied buf is NUL terminated
scsi: bfa: Ensure the copied buf is NUL terminated
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git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux
Pull btrfs updates from David Sterba:
"This update brings a few minor performance improvements, otherwise
there's a lot of refactoring, cleanups and other sort of not user
visible changes.
Performance improvements:
- inline b-tree locking functions, improvement in metadata-heavy
changes
- relax locking on a range that's being reflinked, allows read
operations to run in parallel
- speed up NOCOW write checks (throughput +9% on a sample test)
- extent locking ranges have been reduced in several places, namely
around delayed ref processing
Core:
- more page to folio conversions:
- relocation
- send
- compression
- inline extent handling
- super block write and wait
- extent_map structure optimizations:
- reduced structure size
- code simplifications
- add shrinker for allocated objects, the numbers can go high and
could exhaust memory on smaller systems (reported) as they may
not get an opportunity to be freed fast enough
- extent locking optimizations:
- reduce locking ranges where it does not seem to be necessary and
are safe due to other means of synchronization
- potential improvements due to lower contention,
allocation/freeing and state management operations of extent
state tracking structures
- delayed ref cleanups and simplifications
- updated trace points
- improved error handling, warnings and assertions
- cleanups and refactoring, unification of error handling paths"
* tag 'for-6.10-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux: (122 commits)
btrfs: qgroup: fix initialization of auto inherit array
btrfs: count super block write errors in device instead of tracking folio error state
btrfs: use the folio iterator in btrfs_end_super_write()
btrfs: convert super block writes to folio in write_dev_supers()
btrfs: convert super block writes to folio in wait_dev_supers()
bio: Export bio_add_folio_nofail to modules
btrfs: remove duplicate included header from fs.h
btrfs: add a cached state to extent_clear_unlock_delalloc
btrfs: push extent lock down in submit_one_async_extent
btrfs: push lock_extent down in cow_file_range()
btrfs: move can_cow_file_range_inline() outside of the extent lock
btrfs: push lock_extent into cow_file_range_inline
btrfs: push extent lock into cow_file_range
btrfs: push extent lock into run_delalloc_cow
btrfs: remove unlock_extent from run_delalloc_compressed
btrfs: push extent lock down in run_delalloc_nocow
btrfs: adjust while loop condition in run_delalloc_nocow
btrfs: push extent lock into run_delalloc_nocow
btrfs: push the extent lock into btrfs_run_delalloc_range
btrfs: lock extent when doing inline extent in compression
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Pull block updates from Jens Axboe:
- Add a partscan attribute in sysfs, fixing an issue with systemd
relying on an internal interface that went away.
- Attempt #2 at making long running discards interruptible. The
previous attempt went into 6.9, but we ended up mostly reverting it
as it had issues.
- Remove old ida_simple API in bcache
- Support for zoned write plugging, greatly improving the performance
on zoned devices.
- Remove the old throttle low interface, which has been experimental
since 2017 and never made it beyond that and isn't being used.
- Remove page->index debugging checks in brd, as it hasn't caught
anything and prepares us for removing in struct page.
- MD pull request from Song
- Don't schedule block workers on isolated CPUs
* tag 'for-6.10/block-20240511' of git://git.kernel.dk/linux: (84 commits)
blk-throttle: delay initialization until configuration
blk-throttle: remove CONFIG_BLK_DEV_THROTTLING_LOW
block: fix that util can be greater than 100%
block: support to account io_ticks precisely
block: add plug while submitting IO
bcache: fix variable length array abuse in btree_iter
bcache: Remove usage of the deprecated ida_simple_xx() API
md: Revert "md: Fix overflow in is_mddev_idle"
blk-lib: check for kill signal in ioctl BLKDISCARD
block: add a bio_await_chain helper
block: add a blk_alloc_discard_bio helper
block: add a bio_chain_and_submit helper
block: move discard checks into the ioctl handler
block: remove the discard_granularity check in __blkdev_issue_discard
block/ioctl: prefer different overflow check
null_blk: Fix the WARNING: modpost: missing MODULE_DESCRIPTION()
block: fix and simplify blkdevparts= cmdline parsing
block: refine the EOF check in blkdev_iomap_begin
block: add a partscan sysfs attribute for disks
block: add a disk_has_partscan helper
...
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git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
Pull misc vfs updates from Christian Brauner:
"This contains the usual miscellaneous features, cleanups, and fixes
for vfs and individual fses.
Features:
- Free up FMODE_* bits. I've freed up bits 6, 7, 8, and 24. That
means we now have six free FMODE_* bits in total (but bit #6
already got used for FMODE_WRITE_RESTRICTED)
- Add FOP_HUGE_PAGES flag (follow-up to FMODE_* cleanup)
- Add fd_raw cleanup class so we can make use of automatic cleanup
provided by CLASS(fd_raw, f)(fd) for O_PATH fds as well
- Optimize seq_puts()
- Simplify __seq_puts()
- Add new anon_inode_getfile_fmode() api to allow specifying f_mode
instead of open-coding it in multiple places
- Annotate struct file_handle with __counted_by() and use
struct_size()
- Warn in get_file() whether f_count resurrection from zero is
attempted (epoll/drm discussion)
- Folio-sophize aio
- Export the subvolume id in statx() for both btrfs and bcachefs
- Relax linkat(AT_EMPTY_PATH) requirements
- Add F_DUPFD_QUERY fcntl() allowing to compare two file descriptors
for dup*() equality replacing kcmp()
Cleanups:
- Compile out swapfile inode checks when swap isn't enabled
- Use (1 << n) notation for FMODE_* bitshifts for clarity
- Remove redundant variable assignment in fs/direct-io
- Cleanup uses of strncpy in orangefs
- Speed up and cleanup writeback
- Move fsparam_string_empty() helper into header since it's currently
open-coded in multiple places
- Add kernel-doc comments to proc_create_net_data_write()
- Don't needlessly read dentry->d_flags twice
Fixes:
- Fix out-of-range warning in nilfs2
- Fix ecryptfs overflow due to wrong encryption packet size
calculation
- Fix overly long line in xfs file_operations (follow-up to FMODE_*
cleanup)
- Don't raise FOP_BUFFER_{R,W}ASYNC for directories in xfs (follow-up
to FMODE_* cleanup)
- Don't call xfs_file_open from xfs_dir_open (follow-up to FMODE_*
cleanup)
- Fix stable offset api to prevent endless loops
- Fix afs file server rotations
- Prevent xattr node from overflowing the eraseblock in jffs2
- Move fdinfo PTRACE_MODE_READ procfs check into the .permission()
operation instead of .open() operation since this caused userspace
regressions"
* tag 'vfs-6.10.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs: (39 commits)
afs: Fix fileserver rotation getting stuck
selftests: add F_DUPDFD_QUERY selftests
fcntl: add F_DUPFD_QUERY fcntl()
file: add fd_raw cleanup class
fs: WARN when f_count resurrection is attempted
seq_file: Simplify __seq_puts()
seq_file: Optimize seq_puts()
proc: Move fdinfo PTRACE_MODE_READ check into the inode .permission operation
fs: Create anon_inode_getfile_fmode()
xfs: don't call xfs_file_open from xfs_dir_open
xfs: drop fop_flags for directories
xfs: fix overly long line in the file_operations
shmem: Fix shmem_rename2()
libfs: Add simple_offset_rename() API
libfs: Fix simple_offset_rename_exchange()
jffs2: prevent xattr node from overflowing the eraseblock
vfs, swap: compile out IS_SWAPFILE() on swapless configs
vfs: relax linkat() AT_EMPTY_PATH - aka flink() - requirements
fs/direct-io: remove redundant assignment to variable retval
fs/dcache: Re-use value stored to dentry->d_flags instead of re-reading
...
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Pull block fixes from Jens Axboe:
- NVMe pull request via Keith:
- nvme target fixes (Sagi, Dan, Maurizo)
- new vendor quirk for broken MSI (Sean)
- Virtual boundary fix for a regression in this merge window (Ming)
* tag 'block-6.9-20240510' of git://git.kernel.dk/linux:
nvmet-rdma: fix possible bad dereference when freeing rsps
nvmet: prevent sprintf() overflow in nvmet_subsys_nsid_exists()
nvmet: make nvmet_wq unbound
nvmet-auth: return the error code to the nvmet_auth_ctrl_hash() callers
nvme-pci: Add quirk for broken MSIs
block: set default max segment size in case of virt_boundary
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Other cgroup policy like bfq, iocost are lazy-initialized when they are
configured for the first time for the device, but blk-throttle is
initialized unconditionally from blkcg_init_disk().
Delay initialization of blk-throttle as well, to save some cpu and
memory overhead if it's not configured.
Noted that once it's initialized, it can't be destroyed until disk
removal, even if it's disabled.
Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Link: https://lore.kernel.org/r/20240509121107.3195568-3-yukuai1@huaweicloud.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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One the one hand, it's marked EXPERIMENTAL since 2017, and looks like
there are no users since then, and no testers and no developers, it's
just not active at all.
On the other hand, even if the config is disabled, there are still many
fields in throtl_grp and throtl_data and many functions that are only
used for throtl low.
At last, currently blk-throtl is initialized during disk initialization,
and destroyed during disk removal, and it exposes many functions to be
called directly from block layer.
Remove throtl low to make code much more cleaner and follow up work much
easier.
Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Acked-by: Tejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/20240509121107.3195568-2-yukuai1@huaweicloud.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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util means the percentage that disk has IO, and theoretically it should
not be greater than 100%. However, there is a gap for rq-based disk:
io_ticks will be updated when rq is allocated, however, before such rq
dispatch to driver, it will not be account as inflight from
blk_mq_start_request() hence diskstats_show()/part_stat_show() will not
update io_ticks. For example:
1) at t0, issue a new IO, rq is allocated, and blk_account_io_start()
update io_ticks;
2) something is wrong with drivers, and the rq can't be dispatched;
3) at t0 + 10s, drivers recovers and rq is dispatched and done, io_ticks
is updated;
Then if user is using "iostat 1" to monitor "util", between t0 - t0+9s,
util will be zero, and between t0+9s - t0+10s, util will be 1000%.
Fix this problem by updating io_ticks from diskstats_show() and
part_stat_show() if there are rq allocated.
Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Link: https://lore.kernel.org/r/20240509123717.3223892-3-yukuai1@huaweicloud.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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Currently, io_ticks is accounted based on sampling, specifically
update_io_ticks() will always account io_ticks by 1 jiffies from
bdev_start_io_acct()/blk_account_io_start(), and the result can be
inaccurate, for example(HZ is 250):
Test script:
fio -filename=/dev/sda -bs=4k -rw=write -direct=1 -name=test -thinktime=4ms
Test result: util is about 90%, while the disk is really idle.
This behaviour is introduced by commit 5b18b5a73760 ("block: delete
part_round_stats and switch to less precise counting"), however, there
was a key point that is missed that this patch also improve performance
a lot:
Before the commit:
part_round_stats:
if (part->stamp != now)
stats |= 1;
part_in_flight()
-> there can be lots of task here in 1 jiffies.
part_round_stats_single()
__part_stat_add()
part->stamp = now;
After the commit:
update_io_ticks:
stamp = part->bd_stamp;
if (time_after(now, stamp))
if (try_cmpxchg())
__part_stat_add()
-> only one task can reach here in 1 jiffies.
Hence in order to account io_ticks precisely, we only need to know if
there are IO inflight at most once in one jiffies. Noted that for
rq-based device, iterating tags should not be used here because
'tags->lock' is grabbed in blk_mq_find_and_get_req(), hence
part_stat_lock_inc/dec() and part_in_flight() is used to trace inflight.
The additional overhead is quite little:
- per cpu add/dec for each IO for rq-based device;
- per cpu sum for each jiffies;
And it's verified by null-blk that there are no performance degration
under heavy IO pressure.
Fixes: 5b18b5a73760 ("block: delete part_round_stats and switch to less precise counting")
Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Link: https://lore.kernel.org/r/20240509123717.3223892-2-yukuai1@huaweicloud.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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So that if caller didn't use plug, for example, __blkdev_direct_IO_simple()
and __blkdev_direct_IO_async(), block layer can still benefit from caching
nsec time in the plug.
Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Link: https://lore.kernel.org/r/20240509123825.3225207-1-yukuai1@huaweicloud.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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Several modules use __bio_add_page() today and may need to be converted
to bio_add_folio_nofail().
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
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Discards can access a significant capacity and take longer than the user
expected. A user may change their mind about wanting to run that command
and attempt to kill the process and do something else with their device.
But since the task is uninterruptable, they have to wait for it to
finish, which could be many hours.
Open code blkdev_issue_discard in the BLKDISCARD ioctl handler and check
for a fatal signal at each iteration so the user doesn't have to wait
for their regretted operation to complete naturally.
Heavily based on an earlier patch from Keith Busch.
Reported-by: Conrad Meyer <conradmeyer@meta.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20240506042027.2289826-7-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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Add a helper to wait for an entire chain of bios to complete.
[hch: split from a larger patch, moved and changed the name now that it
is non-static]
Signed-off-by: Keith Busch <kbusch@kernel.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20240506042027.2289826-6-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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Factor out a helper from __blkdev_issue_discard that chews off as much as
possible from a discard range and allocates a bio for it.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20240506042027.2289826-5-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
|
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This is basically blk_next_bio just with the bio allocation moved
to the caller to allow for more flexible bio handling in the caller.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20240506042027.2289826-4-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
|
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Most bio operations get basic sanity checking in submit_bio and anything
more complicated than that is done in the callers. Discards are a bit
different from that in that a lot of checking is done in
__blkdev_issue_discard, and the specific errnos for that are returned
to userspace. Move the checks that require specific errnos to the ioctl
handler instead, and just leave the basic sanity checking in submit_bio
for the other handlers. This introduces two changes in behavior:
1) the logical block size alignment check of the start and len is lost
for non-ioctl callers.
This matches what is done for other operations including reads and
writes. We should probably verify this for all bios, but for now
make discards match the normal flow.
2) for non-ioctl callers all errors are reported on I/O completion now
instead of synchronously. Callers in general mostly ignore or log
errors so this will actually simplify the code once cleaned up
Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20240506042027.2289826-3-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
|
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We now set a default granularity in the queue limits API, so don't
bother with this extra check.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20240506042027.2289826-2-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
|
|
Running syzkaller with the newly reintroduced signed integer overflow
sanitizer shows this report:
[ 62.982337] ------------[ cut here ]------------
[ 62.985692] cgroup: Invalid name
[ 62.986211] UBSAN: signed-integer-overflow in ../block/ioctl.c:36:46
[ 62.989370] 9pnet_fd: p9_fd_create_tcp (7343): problem connecting socket to 127.0.0.1
[ 62.992992] 9223372036854775807 + 4095 cannot be represented in type 'long long'
[ 62.997827] 9pnet_fd: p9_fd_create_tcp (7345): problem connecting socket to 127.0.0.1
[ 62.999369] random: crng reseeded on system resumption
[ 63.000634] GUP no longer grows the stack in syz-executor.2 (7353): 20002000-20003000 (20001000)
[ 63.000668] CPU: 0 PID: 7353 Comm: syz-executor.2 Not tainted 6.8.0-rc2-00035-gb3ef86b5a957 #1
[ 63.000677] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[ 63.000682] Call Trace:
[ 63.000686] <TASK>
[ 63.000731] dump_stack_lvl+0x93/0xd0
[ 63.000919] __get_user_pages+0x903/0xd30
[ 63.001030] __gup_longterm_locked+0x153e/0x1ba0
[ 63.001041] ? _raw_read_unlock_irqrestore+0x17/0x50
[ 63.001072] ? try_get_folio+0x29c/0x2d0
[ 63.001083] internal_get_user_pages_fast+0x1119/0x1530
[ 63.001109] iov_iter_extract_pages+0x23b/0x580
[ 63.001206] bio_iov_iter_get_pages+0x4de/0x1220
[ 63.001235] iomap_dio_bio_iter+0x9b6/0x1410
[ 63.001297] __iomap_dio_rw+0xab4/0x1810
[ 63.001316] iomap_dio_rw+0x45/0xa0
[ 63.001328] ext4_file_write_iter+0xdde/0x1390
[ 63.001372] vfs_write+0x599/0xbd0
[ 63.001394] ksys_write+0xc8/0x190
[ 63.001403] do_syscall_64+0xd4/0x1b0
[ 63.001421] ? arch_exit_to_user_mode_prepare+0x3a/0x60
[ 63.001479] entry_SYSCALL_64_after_hwframe+0x6f/0x77
[ 63.001535] RIP: 0033:0x7f7fd3ebf539
[ 63.001551] Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 14 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
[ 63.001562] RSP: 002b:00007f7fd32570c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[ 63.001584] RAX: ffffffffffffffda RBX: 00007f7fd3ff3f80 RCX: 00007f7fd3ebf539
[ 63.001590] RDX: 4db6d1e4f7e43360 RSI: 0000000020000000 RDI: 0000000000000004
[ 63.001595] RBP: 00007f7fd3f1e496 R08: 0000000000000000 R09: 0000000000000000
[ 63.001599] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
[ 63.001604] R13: 0000000000000006 R14: 00007f7fd3ff3f80 R15: 00007ffd415ad2b8
...
[ 63.018142] ---[ end trace ]---
Historically, the signed integer overflow sanitizer did not work in the
kernel due to its interaction with `-fwrapv` but this has since been
changed [1] in the newest version of Clang; It was re-enabled in the
kernel with Commit 557f8c582a9ba8ab ("ubsan: Reintroduce signed overflow
sanitizer").
Let's rework this overflow checking logic to not actually perform an
overflow during the check itself, thus avoiding the UBSAN splat.
[1]: https://github.com/llvm/llvm-project/pull/82432
Signed-off-by: Justin Stitt <justinstitt@google.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20240507-b4-sio-block-ioctl-v3-1-ba0c2b32275e@google.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
|
|
For devices with virt_boundary limit, the driver may provide zero max
segment size, we have to set it as UINT_MAX at default. Otherwise, it
may cause warning in driver when handling sglist.
Fix it by setting default max segment size as UINT_MAX.
Cc: Christoph Hellwig <hch@lst.de>
Cc: Mike Snitzer <snitzer@kernel.org>
Fixes: b561ea56a264 ("block: allow device to have both virt_boundary_mask and max segment size")
Tested-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reported-by: Geert Uytterhoeven <geert+renesas@glider.be>
Closes: https://lore.kernel.org/linux-block/7e38b67c-9372-a42d-41eb-abdce33d3372@linux-m68k.org/
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Link: https://lore.kernel.org/r/20240424134722.2584284-1-ming.lei@redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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|
Fix the cmdline parsing of the "blkdevparts=" parameter using strsep(),
which makes the code simpler.
Before commit 146afeb235cc ("block: use strscpy() to instead of
strncpy()"), we used a strncpy() to copy a block device name and partition
names. The commit simply replaced a strncpy() and NULL termination with
a strscpy(). It did not update calculations of length passed to strscpy().
While the length passed to strncpy() is just a length of valid characters
without NULL termination ('\0'), strscpy() takes it as a length of the
destination buffer, including a NULL termination.
Since the source buffer is not necessarily NULL terminated, the current
code copies "length - 1" characters and puts a NULL character in the
destination buffer. It replaces the last character with NULL and breaks
the parsing.
As an example, that buffer will be passed to parse_parts() and breaks
parsing sub-partitions due to the missing ')' at the end, like the
following.
example (Check Point V-80 & OpenWrt):
- Linux Kernel 6.6
[ 0.000000] Kernel command line: console=ttyS0,115200 earlycon=uart8250,mmio32,0xf0512000 crashkernel=30M mvpp2x.queue_mode=1 blkdevparts=mmcblk1:48M@10M(kernel-1),1M(dtb-1),720M(rootfs-1),48M(kernel-2),1M(dtb-2),720M(rootfs-2),300M(default_sw),650M(logs),1M(preset_cfg),1M(adsl),-(storage) maxcpus=4
...
[ 0.884016] mmc1: new HS200 MMC card at address 0001
[ 0.889951] mmcblk1: mmc1:0001 004GA0 3.69 GiB
[ 0.895043] cmdline partition format is invalid.
[ 0.895704] mmcblk1: p1
[ 0.903447] mmcblk1boot0: mmc1:0001 004GA0 2.00 MiB
[ 0.908667] mmcblk1boot1: mmc1:0001 004GA0 2.00 MiB
[ 0.913765] mmcblk1rpmb: mmc1:0001 004GA0 512 KiB, chardev (248:0)
1. "48M@10M(kernel-1),..." is passed to strscpy() with length=17
from parse_parts()
2. strscpy() returns -E2BIG and the destination buffer has
"48M@10M(kernel-1\0"
3. "48M@10M(kernel-1\0" is passed to parse_subpart()
4. parse_subpart() fails to find ')' when parsing a partition name,
and returns error
- Linux Kernel 6.1
[ 0.000000] Kernel command line: console=ttyS0,115200 earlycon=uart8250,mmio32,0xf0512000 crashkernel=30M mvpp2x.queue_mode=1 blkdevparts=mmcblk1:48M@10M(kernel-1),1M(dtb-1),720M(rootfs-1),48M(kernel-2),1M(dtb-2),720M(rootfs-2),300M(default_sw),650M(logs),1M(preset_cfg),1M(adsl),-(storage) maxcpus=4
...
[ 0.953142] mmc1: new HS200 MMC card at address 0001
[ 0.959114] mmcblk1: mmc1:0001 004GA0 3.69 GiB
[ 0.964259] mmcblk1: p1(kernel-1) p2(dtb-1) p3(rootfs-1) p4(kernel-2) p5(dtb-2) 6(rootfs-2) p7(default_sw) p8(logs) p9(preset_cfg) p10(adsl) p11(storage)
[ 0.979174] mmcblk1boot0: mmc1:0001 004GA0 2.00 MiB
[ 0.984674] mmcblk1boot1: mmc1:0001 004GA0 2.00 MiB
[ 0.989926] mmcblk1rpmb: mmc1:0001 004GA0 512 KiB, chardev (248:0
By the way, strscpy() takes a length of destination buffer and it is
often confusing when copying characters with a specified length. Using
strsep() helps to separate the string by the specified character. Then,
we can use strscpy() naturally with the size of the destination buffer.
Separating the string on the fly is also useful to omit the redundant
string copy, reducing memory usage and improve the code readability.
Fixes: 146afeb235cc ("block: use strscpy() to instead of strncpy()")
Suggested-by: Naohiro Aota <naota@elisp.net>
Signed-off-by: INAGAKI Hiroshi <musashino.open@gmail.com>
Reviewed-by: Daniel Golle <daniel@makrotopia.org>
Link: https://lore.kernel.org/r/20240421074005.565-1-musashino.open@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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blkdev_iomap_begin rounds down the offset to the logical block size
before stashing it in iomap->offset and checking that it still is
inside the inode size.
Check the i_size check to the raw pos value so that we don't try a
zero size write if iter->pos is unaligned.
Fixes: 487c607df790 ("block: use iomap for writes to block devices")
Reported-by: syzbot+0a3683a0a6fecf909244@syzkaller.appspotmail.com
Signed-off-by: Christoph Hellwig <hch@lst.de>
Tested-by: syzbot+0a3683a0a6fecf909244@syzkaller.appspotmail.com
Link: https://lore.kernel.org/r/20240503081042.2078062-1-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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Userspace had been unknowingly relying on a non-stable interface of
kernel internals to determine if partition scanning is enabled for a
given disk. Provide a stable interface for this purpose instead.
Cc: stable@vger.kernel.org # 6.3+
Depends-on: 140ce28dd3be ("block: add a disk_has_partscan helper")
Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/linux-block/ZhQJf8mzq_wipkBH@gardel-login/
Link: https://lore.kernel.org/r/20240502130033.1958492-3-hch@lst.de
[axboe: add links and commit message from Keith]
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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Add a helper to check if partition scanning is enabled instead of
open coding the check in a few places. This now always checks for
the hidden flag even if all but one of the callers are never reachable
for hidden gendisks.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20240502130033.1958492-2-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
|
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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
|
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Here we know that bdevfs inodes are coallocated with struct block_device
and we can get to ->bd_inode value without any dereferencing. Introduce
an inlined helper (static, *not* exported, purely internal for bdev.c)
that gets an associated inode by block_device - BD_INODE(bdev).
NOTE: leave it static; nobody outside of block/bdev.c has any business
playing with that.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
|
|
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Link: https://lore.kernel.org/r/20240411145346.2516848-6-viro@zeniv.linux.org.uk
Signed-off-by: Christian Brauner <brauner@kernel.org>
|
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Just the low-hanging fruit...
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Link: https://lore.kernel.org/r/20240411145346.2516848-2-viro@zeniv.linux.org.uk
Signed-off-by: Christian Brauner <brauner@kernel.org>
|
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points to ->i_data of coallocated inode.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Link: https://lore.kernel.org/r/20240411145346.2516848-1-viro@zeniv.linux.org.uk
Signed-off-by: Christian Brauner <brauner@kernel.org>
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bdev_unhash(): make block device invisible to lookups by device number
bdev_drop(): drop reference to associated inode.
Both are internal, for use by genhd and partition-related code - similar
to bdev_add(). The logics in there (especially the lifetime-related
parts of it) ought to be cleaned up, but that's a separate story; here
we just encapsulate getting to associated inode.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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disk_live() and block_size() access bd_inode directly, prepare to remove
the field bd_inode from block_device, and only access bd_inode in block
layer.
Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Link: https://lore.kernel.org/r/20240411145346.2516848-8-viro@zeniv.linux.org.uk
Signed-off-by: Christian Brauner <brauner@kernel.org>
|
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... same as in other methods - bdev_file_inode() and I_BDEV() of that.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Link: https://lore.kernel.org/r/20240411145346.2516848-5-viro@zeniv.linux.org.uk
Signed-off-by: Christian Brauner <brauner@kernel.org>
|
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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
|
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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
|
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In bdev_alloc() we have all flags initialized to false, so
assignment to ->bh_has_submit_bio n there is a no-op unless
we have partno != 0 and flag already set on entire device.
In device_add_disk() we have just allocated the block_device
in question and it had been a full-device one, so the flag
is guaranteed to be still clear when we get to assignment.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
|
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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
|
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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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Replace bd_partno with a 32bit field (__bd_flags). The lower 8 bits
contain the partition number, the upper 24 are for flags.
Helpers: bdev_{test,set,clear}_flag(bdev, flag), with atomic_or()
and atomic_andnot() used to set/clear.
NOTE: this commit does not actually move any flags over there - they
are still bool fields. As the result, it shifts the fields wrt
cacheline boundaries; that's going to be restored once the first
3 flags are dealt with.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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On the next step it's going to get folded into a field where flags will go.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
|
