- 26 Jun, 2024 6 commits
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Christoph Hellwig authored
"static" never goes on a line of its own. Signed-off-by:
Christoph Hellwig <hch@lst.de> Reviewed-by:
John Garry <john.g.garry@oracle.com> Reviewed-by:
Damien Le Moal <dlemoal@kernel.org> Link: https://lore.kernel.org/r/20240626142637.300624-6-hch@lst.deSigned-off-by:
Jens Axboe <axboe@kernel.dk>
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Christoph Hellwig authored
... and let sparse help us catch mismatches or abuses. Signed-off-by:
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Christoph Hellwig authored
This is a flag for ->flags and not a feature for ->features. And fix the one place that actually incorrectly cleared it from ->features. Signed-off-by:
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Christoph Hellwig authored
Check the features flag and the override flag using the blk_queue_write_cache, helper otherwise we're going to always report "write through". Fixes: 1122c0c1 ("block: move cache control settings out of queue->flags") Signed-off-by:
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Christoph Hellwig authored
The md driver wants to enforce a number of flags for all devices, even when not inheriting them from the underlying devices. To make sure these flags survive the queue_limits_set calls that md uses to update the queue limits without deriving them form the previous limits add a new md_init_stacking_limits helper that calls blk_set_stacking_limits and sets these flags. Fixes: 1122c0c1 ("block: move cache control settings out of queue->flags") Reported-by:
kernel test robot <oliver.sang@intel.com> Signed-off-by:
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Mikulas Patocka authored
If we allocate a bio that is larger than NVMe maximum request size, attach integrity metadata to it and send it to the NVMe subsystem, the integrity metadata will be corrupted. Splitting the bio works correctly. The function bio_split will clone the bio, trim the iterator of the first bio and advance the iterator of the second bio. However, the function rq_integrity_vec has a bug - it returns the first vector of the bio's metadata and completely disregards the metadata iterator that was advanced when the bio was split. Thus, the second bio uses the same metadata as the first bio and this leads to metadata corruption. This commit changes rq_integrity_vec, so that it calls mp_bvec_iter_bvec instead of returning the first vector. mp_bvec_iter_bvec reads the iterator and uses it to build a bvec for the current position in the iterator. The "queue_max_integrity_segments(rq->q) > 1" check was removed, because the updated rq_integrity_vec function works correctly with multiple segments. Signed-off-by:
Mikulas Patocka <mpatocka@redhat.com> Reviewed-by:
Anuj Gupta <anuj20.g@samsung.com> Reviewed-by:
Kanchan Joshi <joshi.k@samsung.com> Reviewed-by:
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- 24 Jun, 2024 2 commits
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Christoph Hellwig authored
Take care of the inverse polarity of the BLK_FEAT_ROTATIONAL flag vs the old nonrot helper. Fixes: bd4a633b ("block: move the nonrot flag to queue_limits") Reported-by:
Keith Busch <kbusch@kernel.org> Signed-off-by:
Bart Van Assche <bvanassche@acm.org> Link: https://lore.kernel.org/r/20240624173835.76753-1-hch@lst.deSigned-off-by:
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Jeff Johnson authored
make allmodconfig && make W=1 C=1 reports: modpost: missing MODULE_DESCRIPTION() in drivers/block/brd.o Add the missing invocation of the MODULE_DESCRIPTION() macro. Signed-off-by:
Jeff Johnson <quic_jjohnson@quicinc.com> Link: https://lore.kernel.org/r/20240602-md-block-brd-v1-1-e71338e131b6@quicinc.comSigned-off-by:
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- 23 Jun, 2024 1 commit
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Jeff Johnson authored
make allmodconfig && make W=1 C=1 reports: WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/cdrom/cdrom.o Add the missing MODULE_DESCRIPTION() macro invocation. Signed-off-by:
Phillip Potter <phil@philpotter.co.uk> Link: https://lore.kernel.org/lkml/ZluYQbvrJkRlhnJC@KernelVMSigned-off-by:
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- 21 Jun, 2024 4 commits
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John Garry authored
For arm32, we get the following build warning: In file included from /tmp/next/build/include/linux/printk.h:10, from /tmp/next/build/include/linux/kernel.h:31, from /tmp/next/build/block/blk-settings.c:5: /tmp/next/build/block/blk-settings.c: In function 'blk_validate_atomic_write_limits': /tmp/next/build/include/asm-generic/div64.h:222:35: warning: comparison of distinct pointer types lacks a cast 222 | (void)(((typeof((n)) *)0) == ((uint64_t *)0)); \ | ^~ The divident for do_div() should be 64b, which it is not. Since we want to check 2x unsigned ints, just use % operator. This allows us to drop the chunk_sectors variable. Fixes: 9da3d1e9 ("block: Add core atomic write support") Reported-by:Mark Brown <broonie@kernel.org> Closes: https://lore.kernel.org/linux-next/b765d200-4e0f-48b1-a962-7dfa1c4aef9c@kernel.dk/T/#mbf067b1edd89c7f9d7dac6e258c516199953a108Signed-off-by:
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Damien Le Moal authored
There is no need to conditionally define on CONFIG_BLK_DEV_ZONED the inline helper functions bdev_nr_zones(), bdev_max_open_zones(), bdev_max_active_zones() and disk_zone_no() as these function will return the correct valu in all cases (zoned device or not, including when CONFIG_BLK_DEV_ZONED is not set). Furthermore, disk_nr_zones() definition can be simplified as disk->nr_zones is always 0 for regular block devices. Signed-off-by:
Johannes Thumshirn <johannes.thumshirn@wdc.com> Link: https://lore.kernel.org/r/20240621031506.759397-4-dlemoal@kernel.orgSigned-off-by:
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Damien Le Moal authored
There is no need for bdev_nr_zones() to be an exported function calculating the number of zones of a block device. Instead, given that all callers use this helper with a fully initialized block device that has a gendisk, we can redefine this function as an inline helper in blkdev.h. Signed-off-by:
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Damien Le Moal authored
In null_register_zoned_dev(), there is no need to set disk->nr_zones as the now uncoditional call to blk_revalidate_disk_zones() will do that. So remove the assignment using bdev_nr_zones(). Signed-off-by:
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- 20 Jun, 2024 18 commits
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Alan Adamson authored
Add support to set block layer request_queue atomic write limits. The limits will be derived from either the namespace or controller atomic parameters. NVMe atomic-related parameters are grouped into "normal" and "power-fail" (or PF) class of parameter. For atomic write support, only PF parameters are of interest. The "normal" parameters are concerned with racing reads and writes (which also applies to PF). See NVM Command Set Specification Revision 1.0d section 2.1.4 for reference. Whether to use per namespace or controller atomic parameters is decided by NSFEAT bit 1 - see Figure 97: Identify – Identify Namespace Data Structure, NVM Command Set. NVMe namespaces may define an atomic boundary, whereby no atomic guarantees are provided for a write which straddles this per-lba space boundary. The block layer merging policy is such that no merges may occur in which the resultant request would straddle such a boundary. Unlike SCSI, NVMe specifies no granularity or alignment rules, apart from atomic boundary rule. In addition, again unlike SCSI, there is no dedicated atomic write command - a write which adheres to the atomic size limit and boundary is implicitly atomic. If NSFEAT bit 1 is set, the following parameters are of interest: - NAWUPF (Namespace Atomic Write Unit Power Fail) - NABSPF (Namespace Atomic Boundary Size Power Fail) - NABO (Namespace Atomic Boundary Offset) and we set request_queue limits as follows: - atomic_write_unit_max = rounddown_pow_of_two(NAWUPF) - atomic_write_max_bytes = NAWUPF - atomic_write_boundary = NABSPF If in the unlikely scenario that NABO is non-zero, then atomic writes will not be supported at all as dealing with this adds extra complexity. This policy may change in future. In all cases, atomic_write_unit_min is set to the logical block size. If NSFEAT bit 1 is unset, the following parameter is of interest: - AWUPF (Atomic Write Unit Power Fail) and we set request_queue limits as follows: - atomic_write_unit_max = rounddown_pow_of_two(AWUPF) - atomic_write_max_bytes = AWUPF - atomic_write_boundary = 0 A new function, nvme_valid_atomic_write(), is also called from submission path to verify that a request has been submitted to the driver will actually be executed atomically. As mentioned, there is no dedicated NVMe atomic write command (which may error for a command which exceeds the controller atomic write limits). Note on NABSPF: There seems to be some vagueness in the spec as to whether NABSPF applies for NSFEAT bit 1 being unset. Figure 97 does not explicitly mention NABSPF and how it is affected by bit 1. However Figure 4 does tell to check Figure 97 for info about per-namespace parameters, which NABSPF is, so it is implied. However currently nvme_update_disk_info() does check namespace parameter NABO regardless of this bit. Signed-off-by:
Alan Adamson <alan.adamson@oracle.com> Reviewed-by:
Martin K. Petersen <martin.petersen@oracle.com> jpg: total rewrite Signed-off-by:
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John Garry authored
Add initial support for atomic writes. As is standard method, feed device properties via modules param, those being: - atomic_max_size_blks - atomic_alignment_blks - atomic_granularity_blks - atomic_max_size_with_boundary_blks - atomic_max_boundary_blks These just match sbc4r22 section 6.6.4 - Block limits VPD page. We just support ATOMIC WRITE (16). The major change in the driver is how we lock the device for RW accesses. Currently the driver uses a per-device lock for accessing device metadata and "media" data (calls to do_device_access()) atomically for the duration of the whole read/write command. This should not suit verifying atomic writes. Reason being that currently all reads/writes are atomic, so using atomic writes does not prove anything. Change device access model to basis that regular writes only atomic on a per-sector basis, while reads and atomic writes are fully atomic. As mentioned, since accessing metadata and device media is atomic, continue to have regular writes involving metadata - like discard or PI - as atomic. We can improve this later. Currently we only support model where overlapping going reads or writes wait for current access to complete before commencing an atomic write. This is described in 4.29.3.2 section of the SBC. However, we simplify, things and wait for all accesses to complete (when issuing an atomic write). Reviewed-by:
Darrick J. Wong <djwong@kernel.org> Reviewed-by:
Luis Chamberlain <mcgrof@kernel.org> Link: https://lore.kernel.org/r/20240620125359.2684798-10-john.g.garry@oracle.comSigned-off-by:
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John Garry authored
Support is divided into two main areas: - reading VPD pages and setting sdev request_queue limits - support WRITE ATOMIC (16) command and tracing The relevant block limits VPD page need to be read to allow the block layer request_queue atomic write limits to be set. These VPD page limits are described in sbc4r22 section 6.6.4 - Block limits VPD page. There are five limits of interest: - MAXIMUM ATOMIC TRANSFER LENGTH - ATOMIC ALIGNMENT - ATOMIC TRANSFER LENGTH GRANULARITY - MAXIMUM ATOMIC TRANSFER LENGTH WITH BOUNDARY - MAXIMUM ATOMIC BOUNDARY SIZE MAXIMUM ATOMIC TRANSFER LENGTH is the maximum length for a WRITE ATOMIC (16) command. It will not be greater than the device MAXIMUM TRANSFER LENGTH. ATOMIC ALIGNMENT and ATOMIC TRANSFER LENGTH GRANULARITY are the minimum alignment and length values for an atomic write in terms of logical blocks. Unlike NVMe, SCSI does not specify an LBA space boundary, but does specify a per-IO boundary granularity. The maximum boundary size is specified in MAXIMUM ATOMIC BOUNDARY SIZE. When used, this boundary value is set in the WRITE ATOMIC (16) ATOMIC BOUNDARY field - layout for the WRITE_ATOMIC_16 command can be found in sbc4r22 section 5.48. This boundary value is the granularity size at which the device may atomically write the data. A value of zero in WRITE ATOMIC (16) ATOMIC BOUNDARY field means that all data must be atomically written together. MAXIMUM ATOMIC TRANSFER LENGTH WITH BOUNDARY is the maximum atomic write length if a non-zero boundary value is set. For atomic write support, the WRITE ATOMIC (16) boundary is not of much interest, as the block layer expects each request submitted to be executed atomically. However, the SCSI spec does leave itself open to a quirky scenario where MAXIMUM ATOMIC TRANSFER LENGTH is zero, yet MAXIMUM ATOMIC TRANSFER LENGTH WITH BOUNDARY and MAXIMUM ATOMIC BOUNDARY SIZE are both non-zero. This case will be supported. To set the block layer request_queue atomic write capabilities, sanitize the VPD page limits and set limits as follows: - atomic_write_unit_min is derived from granularity and alignment values. If no granularity value is not set, use physical block size - atomic_write_unit_max is derived from MAXIMUM ATOMIC TRANSFER LENGTH. In the scenario where MAXIMUM ATOMIC TRANSFER LENGTH is zero and boundary limits are non-zero, use MAXIMUM ATOMIC BOUNDARY SIZE for atomic_write_unit_max. New flag scsi_disk.use_atomic_write_boundary is set for this scenario. - atomic_write_boundary_bytes is set to zero always SCSI also supports a WRITE ATOMIC (32) command, which is for type 2 protection enabled. This is not going to be supported now, so check for T10_PI_TYPE2_PROTECTION when setting any request_queue limits. To handle an atomic write request, add support for WRITE ATOMIC (16) command in handler sd_setup_atomic_cmnd(). Flag use_atomic_write_boundary is checked here for encoding ATOMIC BOUNDARY field. Trace info is also added for WRITE_ATOMIC_16 command. Reviewed-by:
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John Garry authored
Support atomic writes by submitting a single BIO with the REQ_ATOMIC set. It must be ensured that the atomic write adheres to its rules, like naturally aligned offset, so call blkdev_dio_invalid() -> blkdev_atomic_write_valid() [with renaming blkdev_dio_unaligned() to blkdev_dio_invalid()] for this purpose. The BIO submission path currently checks for atomic writes which are too large, so no need to check here. In blkdev_direct_IO(), if the nr_pages exceeds BIO_MAX_VECS, then we cannot produce a single BIO, so error in this case. Finally set FMODE_CAN_ATOMIC_WRITE when the bdev can support atomic writes and the associated file flag is for O_DIRECT. Reviewed-by:
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Prasad Singamsetty authored
Extend statx system call to return additional info for atomic write support support if the specified file is a block device. Reviewed-by:
Prasad Singamsetty <prasad.singamsetty@oracle.com> Signed-off-by:
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John Garry authored
Add atomic write support, as follows: - add helper functions to get request_queue atomic write limits - report request_queue atomic write support limits to sysfs and update Doc - support to safely merge atomic writes - deal with splitting atomic writes - misc helper functions - add a per-request atomic write flag New request_queue limits are added, as follows: - atomic_write_hw_max is set by the block driver and is the maximum length of an atomic write which the device may support. It is not necessarily a power-of-2. - atomic_write_max_sectors is derived from atomic_write_hw_max_sectors and max_hw_sectors. It is always a power-of-2. Atomic writes may be merged, and atomic_write_max_sectors would be the limit on a merged atomic write request size. This value is not capped at max_sectors, as the value in max_sectors can be controlled from userspace, and it would only cause trouble if userspace could limit atomic_write_unit_max_bytes and the other atomic write limits. - atomic_write_hw_unit_{min,max} are set by the block driver and are the min/max length of an atomic write unit which the device may support. They both must be a power-of-2. Typically atomic_write_hw_unit_max will hold the same value as atomic_write_hw_max. - atomic_write_unit_{min,max} are derived from atomic_write_hw_unit_{min,max}, max_hw_sectors, and block core limits. Both min and max values must be a power-of-2. - atomic_write_hw_boundary is set by the block driver. If non-zero, it indicates an LBA space boundary at which an atomic write straddles no longer is atomically executed by the disk. The value must be a power-of-2. Note that it would be acceptable to enforce a rule that atomic_write_hw_boundary_sectors is a multiple of atomic_write_hw_unit_max, but the resultant code would be more complicated. All atomic writes limits are by default set 0 to indicate no atomic write support. Even though it is assumed by Linux that a logical block can always be atomically written, we ignore this as it is not of particular interest. Stacked devices are just not supported either for now. An atomic write must always be submitted to the block driver as part of a single request. As such, only a single BIO must be submitted to the block layer for an atomic write. When a single atomic write BIO is submitted, it cannot be split. As such, atomic_write_unit_{max, min}_bytes are limited by the maximum guaranteed BIO size which will not be required to be split. This max size is calculated by request_queue max segments and the number of bvecs a BIO can fit, BIO_MAX_VECS. Currently we rely on userspace issuing a write with iovcnt=1 for pwritev2() - as such, we can rely on each segment containing PAGE_SIZE of data, apart from the first+last, which each can fit logical block size of data. The first+last will be LBS length/aligned as we rely on direct IO alignment rules also. New sysfs files are added to report the following atomic write limits: - atomic_write_unit_max_bytes - same as atomic_write_unit_max_sectors in bytes - atomic_write_unit_min_bytes - same as atomic_write_unit_min_sectors in bytes - atomic_write_boundary_bytes - same as atomic_write_hw_boundary_sectors in bytes - atomic_write_max_bytes - same as atomic_write_max_sectors in bytes Atomic writes may only be merged with other atomic writes and only under the following conditions: - total resultant request length <= atomic_write_max_bytes - the merged write does not straddle a boundary Helper function bdev_can_atomic_write() is added to indicate whether atomic writes may be issued to a bdev. If a bdev is a partition, the partition start must be aligned with both atomic_write_unit_min_sectors and atomic_write_hw_boundary_sectors. FSes will rely on the block layer to validate that an atomic write BIO submitted will be of valid size, so add blk_validate_atomic_write_op_size() for this purpose. Userspace expects an atomic write which is of invalid size to be rejected with -EINVAL, so add BLK_STS_INVAL for this. Also use BLK_STS_INVAL for when a BIO needs to be split, as this should mean an invalid size BIO. Flag REQ_ATOMIC is used for indicating an atomic write. Co-developed-by:Himanshu Madhani <himanshu.madhani@oracle.com> Signed-off-by:
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Prasad Singamsetty authored
Extend statx system call to return additional info for atomic write support support for a file. Helper function generic_fill_statx_atomic_writes() can be used by FSes to fill in the relevant statx fields. For now atomic_write_segments_max will always be 1, otherwise some rules would need to be imposed on iovec length and alignment, which we don't want now. Signed-off-by:
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Prasad Singamsetty authored
An atomic write is a write issued with torn-write protection, meaning that for a power failure or any other hardware failure, all or none of the data from the write will be stored, but never a mix of old and new data. Userspace may add flag RWF_ATOMIC to pwritev2() to indicate that the write is to be issued with torn-write prevention, according to special alignment and length rules. For any syscall interface utilizing struct iocb, add IOCB_ATOMIC for iocb->ki_flags field to indicate the same. A call to statx will give the relevant atomic write info for a file: - atomic_write_unit_min - atomic_write_unit_max - atomic_write_segments_max Both min and max values must be a power-of-2. Applications can avail of atomic write feature by ensuring that the total length of a write is a power-of-2 in size and also sized between atomic_write_unit_min and atomic_write_unit_max, inclusive. Applications must ensure that the write is at a naturally-aligned offset in the file wrt the total write length. The value in atomic_write_segments_max indicates the upper limit for IOV_ITER iovcnt. Add file mode flag FMODE_CAN_ATOMIC_WRITE, so files which do not have the flag set will have RWF_ATOMIC rejected and not just ignored. Add a type argument to kiocb_set_rw_flags() to allows reads which have RWF_ATOMIC set to be rejected. Helper function generic_atomic_write_valid() can be used by FSes to verify compliant writes. There we check for iov_iter type is for ubuf, which implies iovcnt==1 for pwritev2(), which is an initial restriction for atomic_write_segments_max. Initially the only user will be bdev file operations write handler. We will rely on the block BIO submission path to ensure write sizes are compliant for the bdev, so we don't need to check atomic writes sizes yet. Signed-off-by:
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John Garry authored
The purpose of the chunk_sectors limit is to ensure that a mergeble request fits within the boundary of the chunck_sector value. Such a feature will be useful for other request_queue boundary limits, so generalize the chunk_sectors merge code. This idea was proposed by Hannes Reinecke. Reviewed-by:
Hannes Reinecke <hare@suse.de> Acked-by:
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John Garry authored
Currently blk_queue_get_max_sectors() is passed a enum req_op. In future the value returned from blk_queue_get_max_sectors() may depend on certain request flags, so pass a request pointer. Reviewed-by:
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Jens Axboe authored
Merge in queue limits cleanups. * for-6.11/block-limits: block: move the raid_partial_stripes_expensive flag into the features field block: remove the discard_alignment flag block: move the misaligned flag into the features field block: renumber and rename the cache disabled flag block: fix spelling and grammar for in writeback_cache_control.rst block: remove the unused blk_bounce enum
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Andreas Hindborg authored
`blk_queue_flag_set` and `blk_queue_flag_clear` was removed in favor of a new API. This caused a build error for Rust block device abstractions. Thus, use the new feature passing API instead of the old removed API. Fixes: bd4a633b ("block: move the nonrot flag to queue_limits") Signed-off-by:
Andreas Hindborg <a.hindborg@samsung.com> Link: https://lore.kernel.org/r/20240620085721.1218296-1-nmi@metaspace.dkSigned-off-by:
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Christoph Hellwig authored
Move the raid_partial_stripes_expensive flags into the features field to reclaim a little bit of space. Signed-off-by:
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Christoph Hellwig authored
queue_limits.discard_alignment is never read except in the places where it is stacked into another limit. Signed-off-by:
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Christoph Hellwig authored
Move the misaligned flags into the features field to reclaim a little bit of space. Signed-off-by:
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Christoph Hellwig authored
Start with the first bit, and drop the plural-S from the name. Signed-off-by:
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Christoph Hellwig authored
Suggested-by:
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Christoph Hellwig authored
The enum has been replaced with the BLK_FEAT_BOUNCE_HIGH flag. Reported-by:
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- 19 Jun, 2024 9 commits
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Jens Axboe authored
Merge in last round of queue limits changes from Christoph. * for-6.11/block-limits: (26 commits) block: move the bounce flag into the features field block: move the skip_tagset_quiesce flag to queue_limits block: move the pci_p2pdma flag to queue_limits block: move the zone_resetall flag to queue_limits block: move the zoned flag into the features field block: move the poll flag to queue_limits block: move the dax flag to queue_limits block: move the nowait flag to queue_limits block: move the synchronous flag to queue_limits block: move the stable_writes flag to queue_limits block: move the io_stat flag setting to queue_limits block: move the add_random flag to queue_limits block: move the nonrot flag to queue_limits block: move cache control settings out of queue->flags block: remove blk_flush_policy block: freeze the queue in queue_attr_store nbd: move setting the cache control flags to __nbd_set_size virtio_blk: remove virtblk_update_cache_mode loop: fold loop_update_rotational into loop_reconfigure_limits loop: also use the default block size from an underlying block device ... Signed-off-by: -
Christoph Hellwig authored
Move the bounce flag into the features field to reclaim a little bit of space. Signed-off-by:
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Christoph Hellwig authored
Move the skip_tagset_quiesce flag into the queue_limits feature field so that it can be set atomically with the queue frozen. Signed-off-by:
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Christoph Hellwig authored
Move the pci_p2pdma flag into the queue_limits feature field so that it can be set atomically with the queue frozen. Signed-off-by:
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Christoph Hellwig authored
Move the zone_resetall flag into the queue_limits feature field so that it can be set atomically with the queue frozen. Signed-off-by:
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Christoph Hellwig authored
Move the zoned flags into the features field to reclaim a little bit of space. Signed-off-by:
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Christoph Hellwig authored
Move the poll flag into the queue_limits feature field so that it can be set atomically with the queue frozen. Stacking drivers are simplified in that they now can simply set the flag, and blk_stack_limits will clear it when the features is not supported by any of the underlying devices. Signed-off-by:
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Christoph Hellwig authored
Move the dax flag into the queue_limits feature field so that it can be set atomically with the queue frozen. Signed-off-by:
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Christoph Hellwig authored
Move the nowait flag into the queue_limits feature field so that it can be set atomically with the queue frozen. Stacking drivers are simplified in that they now can simply set the flag, and blk_stack_limits will clear it when the features is not supported by any of the underlying devices. Signed-off-by:
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