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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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#include "blk.h"#include "blk-rq-qos.h"#include "blk-wbt.h"
void blk_queue_rq_timeout(struct request_queue *q, unsigned int timeout){ WRITE_ONCE(q->rq_timeout, timeout);}EXPORT_SYMBOL_GPL(blk_queue_rq_timeout);
/** * blk_set_stacking_limits - set default limits for stacking devices * @lim: the queue_limits structure to reset * * Prepare queue limits for applying limits from underlying devices using * blk_stack_limits(). */void blk_set_stacking_limits(struct queue_limits *lim){ memset(lim, 0, sizeof(*lim)); lim->logical_block_size = SECTOR_SIZE; lim->physical_block_size = SECTOR_SIZE; lim->io_min = SECTOR_SIZE; lim->discard_granularity = SECTOR_SIZE; lim->dma_alignment = SECTOR_SIZE - 1; lim->seg_boundary_mask = BLK_SEG_BOUNDARY_MASK;
/* Inherit limits from component devices */ lim->max_segments = USHRT_MAX; lim->max_discard_segments = USHRT_MAX; lim->max_hw_sectors = UINT_MAX; lim->max_segment_size = UINT_MAX; lim->max_sectors = UINT_MAX; lim->max_dev_sectors = UINT_MAX; lim->max_write_zeroes_sectors = UINT_MAX; lim->max_hw_wzeroes_unmap_sectors = UINT_MAX; lim->max_user_wzeroes_unmap_sectors = UINT_MAX; lim->max_hw_zone_append_sectors = UINT_MAX; lim->max_user_discard_sectors = UINT_MAX; lim->atomic_write_hw_max = UINT_MAX;}EXPORT_SYMBOL(blk_set_stacking_limits);
void blk_apply_bdi_limits(struct backing_dev_info *bdi, struct queue_limits *lim){ u64 io_opt = lim->io_opt;
/* * For read-ahead of large files to be effective, we need to read ahead * at least twice the optimal I/O size. For rotational devices that do * not report an optimal I/O size (e.g. ATA HDDs), use the maximum I/O * size to avoid falling back to the (rather inefficient) small default * read-ahead size. * * There is no hardware limitation for the read-ahead size and the user * might have increased the read-ahead size through sysfs, so don't ever * decrease it. */ if (!io_opt && (lim->features & BLK_FEAT_ROTATIONAL)) io_opt = (u64)lim->max_sectors << SECTOR_SHIFT;
bdi->ra_pages = max3(bdi->ra_pages, io_opt * 2 >> PAGE_SHIFT, VM_READAHEAD_PAGES); bdi->io_pages = lim->max_sectors >> PAGE_SECTORS_SHIFT;}
static int blk_validate_zoned_limits(struct queue_limits *lim){ if (!(lim->features & BLK_FEAT_ZONED)) { if (WARN_ON_ONCE(lim->max_open_zones) || WARN_ON_ONCE(lim->max_active_zones) || WARN_ON_ONCE(lim->zone_write_granularity) || WARN_ON_ONCE(lim->max_zone_append_sectors)) return -EINVAL; return 0; }
if (WARN_ON_ONCE(!IS_ENABLED(CONFIG_BLK_DEV_ZONED))) return -EINVAL;
/* * Given that active zones include open zones, the maximum number of * open zones cannot be larger than the maximum number of active zones. */ if (lim->max_active_zones && lim->max_open_zones > lim->max_active_zones) return -EINVAL;
if (lim->zone_write_granularity < lim->logical_block_size) lim->zone_write_granularity = lim->logical_block_size;
/* * The Zone Append size is limited by the maximum I/O size and the zone * size given that it can't span zones. * * If no max_hw_zone_append_sectors limit is provided, the block layer * will emulated it, else we're also bound by the hardware limit. */ lim->max_zone_append_sectors = min_not_zero(lim->max_hw_zone_append_sectors, min(lim->chunk_sectors, lim->max_hw_sectors)); return 0;}
static int blk_validate_integrity_limits(struct queue_limits *lim){ struct blk_integrity *bi = &lim->integrity;
if (!bi->metadata_size) { if (bi->csum_type != BLK_INTEGRITY_CSUM_NONE || bi->tag_size || ((bi->flags & BLK_INTEGRITY_REF_TAG))) { pr_warn("invalid PI settings.\n"); return -EINVAL; } bi->flags |= BLK_INTEGRITY_NOGENERATE | BLK_INTEGRITY_NOVERIFY; return 0; }
if (!IS_ENABLED(CONFIG_BLK_DEV_INTEGRITY)) { pr_warn("integrity support disabled.\n"); return -EINVAL; }
if (bi->csum_type == BLK_INTEGRITY_CSUM_NONE && (bi->flags & BLK_INTEGRITY_REF_TAG)) { pr_warn("ref tag not support without checksum.\n"); return -EINVAL; }
if (bi->pi_offset + bi->pi_tuple_size > bi->metadata_size) { pr_warn("pi_offset (%u) + pi_tuple_size (%u) exceeds metadata_size (%u)\n", bi->pi_offset, bi->pi_tuple_size, bi->metadata_size); return -EINVAL; }
switch (bi->csum_type) { case BLK_INTEGRITY_CSUM_NONE: if (bi->pi_tuple_size) { pr_warn("pi_tuple_size must be 0 when checksum type is none\n"); return -EINVAL; } break; case BLK_INTEGRITY_CSUM_CRC: case BLK_INTEGRITY_CSUM_IP: if (bi->pi_tuple_size != sizeof(struct t10_pi_tuple)) { pr_warn("pi_tuple_size mismatch for T10 PI: expected %zu, got %u\n", sizeof(struct t10_pi_tuple), bi->pi_tuple_size); return -EINVAL; } break; case BLK_INTEGRITY_CSUM_CRC64: if (bi->pi_tuple_size != sizeof(struct crc64_pi_tuple)) { pr_warn("pi_tuple_size mismatch for CRC64 PI: expected %zu, got %u\n", sizeof(struct crc64_pi_tuple), bi->pi_tuple_size); return -EINVAL; } break; }
if (!bi->interval_exp) { bi->interval_exp = ilog2(lim->logical_block_size); } else if (bi->interval_exp < SECTOR_SHIFT || bi->interval_exp > ilog2(lim->logical_block_size)) { pr_warn("invalid interval_exp %u\n", bi->interval_exp); return -EINVAL; }
/* * Some IO controllers can not handle data intervals straddling * multiple bio_vecs. For those, enforce alignment so that those are * never generated, and that each buffer is aligned as expected. */ if (!(bi->flags & BLK_SPLIT_INTERVAL_CAPABLE) && bi->csum_type) { lim->dma_alignment = max(lim->dma_alignment, (1U << bi->interval_exp) - 1); }
/* * The block layer automatically adds integrity data for bios that don't * already have it. Limit the I/O size so that a single maximum size * metadata segment can cover the integrity data for the entire I/O. */ lim->max_sectors = min(lim->max_sectors, max_integrity_io_size(lim) >> SECTOR_SHIFT);
return 0;}
/* * Returns max guaranteed bytes which we can fit in a bio. * * We request that an atomic_write is ITER_UBUF iov_iter (so a single vector), * so we assume that we can fit in at least PAGE_SIZE in a segment, apart from * the first and last segments. */static unsigned int blk_queue_max_guaranteed_bio(struct queue_limits *lim){ unsigned int max_segments = min(BIO_MAX_VECS, lim->max_segments); unsigned int length;
length = min(max_segments, 2) * lim->logical_block_size; if (max_segments > 2) length += (max_segments - 2) * PAGE_SIZE;
return length;}
static void blk_atomic_writes_update_limits(struct queue_limits *lim){ unsigned int unit_limit = min(lim->max_hw_sectors << SECTOR_SHIFT, blk_queue_max_guaranteed_bio(lim));
unit_limit = rounddown_pow_of_two(unit_limit);
lim->atomic_write_max_sectors = min(lim->atomic_write_hw_max >> SECTOR_SHIFT, lim->max_hw_sectors); lim->atomic_write_unit_min = min(lim->atomic_write_hw_unit_min, unit_limit); lim->atomic_write_unit_max = min(lim->atomic_write_hw_unit_max, unit_limit); lim->atomic_write_boundary_sectors = lim->atomic_write_hw_boundary >> SECTOR_SHIFT;}
/* * Test whether any boundary is aligned with any chunk size. Stacked * devices store any stripe size in t->chunk_sectors. */static bool blk_valid_atomic_writes_boundary(unsigned int chunk_sectors, unsigned int boundary_sectors){ if (!chunk_sectors || !boundary_sectors) return true;
if (boundary_sectors > chunk_sectors && boundary_sectors % chunk_sectors) return false;
if (chunk_sectors > boundary_sectors && chunk_sectors % boundary_sectors) return false;
return true;}
static void blk_validate_atomic_write_limits(struct queue_limits *lim){ unsigned int boundary_sectors; unsigned int atomic_write_hw_max_sectors = lim->atomic_write_hw_max >> SECTOR_SHIFT;
if (!(lim->features & BLK_FEAT_ATOMIC_WRITES)) goto unsupported;
/* UINT_MAX indicates stacked limits in initial state */ if (lim->atomic_write_hw_max == UINT_MAX) goto unsupported;
if (!lim->atomic_write_hw_max) goto unsupported;
if (WARN_ON_ONCE(!is_power_of_2(lim->atomic_write_hw_unit_min))) goto unsupported;
if (WARN_ON_ONCE(!is_power_of_2(lim->atomic_write_hw_unit_max))) goto unsupported;
if (WARN_ON_ONCE(lim->atomic_write_hw_unit_min > lim->atomic_write_hw_unit_max)) goto unsupported;
if (WARN_ON_ONCE(lim->atomic_write_hw_unit_max > lim->atomic_write_hw_max)) goto unsupported;
if (WARN_ON_ONCE(lim->chunk_sectors && atomic_write_hw_max_sectors > lim->chunk_sectors)) goto unsupported;
boundary_sectors = lim->atomic_write_hw_boundary >> SECTOR_SHIFT;
if (boundary_sectors) { if (WARN_ON_ONCE(lim->atomic_write_hw_max > lim->atomic_write_hw_boundary)) goto unsupported;
if (WARN_ON_ONCE(!blk_valid_atomic_writes_boundary( lim->chunk_sectors, boundary_sectors))) goto unsupported;
/* * The boundary size just needs to be a multiple of unit_max * (and not necessarily a power-of-2), so this following check * could be relaxed in future. * Furthermore, if needed, unit_max could even be reduced so * that it is compliant with a !power-of-2 boundary. */ if (!is_power_of_2(boundary_sectors)) goto unsupported; }
blk_atomic_writes_update_limits(lim); return;
unsupported: lim->atomic_write_max_sectors = 0; lim->atomic_write_boundary_sectors = 0; lim->atomic_write_unit_min = 0; lim->atomic_write_unit_max = 0;}
/* * Check that the limits in lim are valid, initialize defaults for unset * values, and cap values based on others where needed. */int blk_validate_limits(struct queue_limits *lim){ unsigned int max_hw_sectors; unsigned int logical_block_sectors; unsigned long seg_size; int err;
/* * Unless otherwise specified, default to 512 byte logical blocks and a * physical block size equal to the logical block size. */ if (!lim->logical_block_size) lim->logical_block_size = SECTOR_SIZE; else if (blk_validate_block_size(lim->logical_block_size)) { pr_warn("Invalid logical block size (%d)\n", lim->logical_block_size); return -EINVAL; } if (lim->physical_block_size < lim->logical_block_size) { lim->physical_block_size = lim->logical_block_size; } else if (!is_power_of_2(lim->physical_block_size)) { pr_warn("Invalid physical block size (%d)\n", lim->physical_block_size); return -EINVAL; }
/* * The minimum I/O size defaults to the physical block size unless * explicitly overridden. */ if (lim->io_min < lim->physical_block_size) lim->io_min = lim->physical_block_size;
/* * The optimal I/O size may not be aligned to physical block size * (because it may be limited by dma engines which have no clue about * block size of the disks attached to them), so we round it down here. */ lim->io_opt = round_down(lim->io_opt, lim->physical_block_size);
/* * max_hw_sectors has a somewhat weird default for historical reason, * but driver really should set their own instead of relying on this * value. * * The block layer relies on the fact that every driver can * handle at lest a page worth of data per I/O, and needs the value * aligned to the logical block size. */ if (!lim->max_hw_sectors) lim->max_hw_sectors = BLK_SAFE_MAX_SECTORS; if (WARN_ON_ONCE(lim->max_hw_sectors < PAGE_SECTORS)) return -EINVAL; logical_block_sectors = lim->logical_block_size >> SECTOR_SHIFT; if (WARN_ON_ONCE(logical_block_sectors > lim->max_hw_sectors)) return -EINVAL; lim->max_hw_sectors = round_down(lim->max_hw_sectors, logical_block_sectors);
/* * The actual max_sectors value is a complex beast and also takes the * max_dev_sectors value (set by SCSI ULPs) and a user configurable * value into account. The ->max_sectors value is always calculated * from these, so directly setting it won't have any effect. */ max_hw_sectors = min_not_zero(lim->max_hw_sectors, lim->max_dev_sectors); if (lim->max_user_sectors) { if (lim->max_user_sectors < BLK_MIN_SEGMENT_SIZE / SECTOR_SIZE) return -EINVAL; lim->max_sectors = min(max_hw_sectors, lim->max_user_sectors); } else if (lim->io_opt > (BLK_DEF_MAX_SECTORS_CAP << SECTOR_SHIFT)) { lim->max_sectors = min(max_hw_sectors, lim->io_opt >> SECTOR_SHIFT); } else if (lim->io_min > (BLK_DEF_MAX_SECTORS_CAP << SECTOR_SHIFT)) { lim->max_sectors = min(max_hw_sectors, lim->io_min >> SECTOR_SHIFT); } else { lim->max_sectors = min(max_hw_sectors, BLK_DEF_MAX_SECTORS_CAP); } lim->max_sectors = round_down(lim->max_sectors, logical_block_sectors);
/* * Random default for the maximum number of segments. Driver should not * rely on this and set their own. */ if (!lim->max_segments) lim->max_segments = BLK_MAX_SEGMENTS;
if (lim->max_hw_wzeroes_unmap_sectors && lim->max_hw_wzeroes_unmap_sectors != lim->max_write_zeroes_sectors) return -EINVAL; lim->max_wzeroes_unmap_sectors = min(lim->max_hw_wzeroes_unmap_sectors, lim->max_user_wzeroes_unmap_sectors);
lim->max_discard_sectors = min(lim->max_hw_discard_sectors, lim->max_user_discard_sectors);
/* * When discard is not supported, discard_granularity should be reported * as 0 to userspace. */ if (lim->max_discard_sectors) lim->discard_granularity = max(lim->discard_granularity, lim->physical_block_size); else lim->discard_granularity = 0;
if (!lim->max_discard_segments) lim->max_discard_segments = 1;
/* * By default there is no limit on the segment boundary alignment, * but if there is one it can't be smaller than the page size as * that would break all the normal I/O patterns. */ if (!lim->seg_boundary_mask) lim->seg_boundary_mask = BLK_SEG_BOUNDARY_MASK; if (WARN_ON_ONCE(lim->seg_boundary_mask < BLK_MIN_SEGMENT_SIZE - 1)) return -EINVAL;
/* * Stacking device may have both virtual boundary and max segment * size limit, so allow this setting now, and long-term the two * might need to move out of stacking limits since we have immutable * bvec and lower layer bio splitting is supposed to handle the two * correctly. */ if (lim->virt_boundary_mask) { if (!lim->max_segment_size) lim->max_segment_size = UINT_MAX; } else { /* * The maximum segment size has an odd historic 64k default that * drivers probably should override. Just like the I/O size we * require drivers to at least handle a full page per segment. */ if (!lim->max_segment_size) lim->max_segment_size = BLK_MAX_SEGMENT_SIZE; if (WARN_ON_ONCE(lim->max_segment_size < BLK_MIN_SEGMENT_SIZE)) return -EINVAL; }
/* setup max segment size for building new segment in fast path */ if (lim->seg_boundary_mask > lim->max_segment_size - 1) seg_size = lim->max_segment_size; else seg_size = lim->seg_boundary_mask + 1; lim->max_fast_segment_size = min_t(unsigned int, seg_size, PAGE_SIZE);
/* * We require drivers to at least do logical block aligned I/O, but * historically could not check for that due to the separate calls * to set the limits. Once the transition is finished the check * below should be narrowed down to check the logical block size. */ if (!lim->dma_alignment) lim->dma_alignment = SECTOR_SIZE - 1; if (WARN_ON_ONCE(lim->dma_alignment > PAGE_SIZE)) return -EINVAL;
if (lim->alignment_offset) { lim->alignment_offset &= (lim->physical_block_size - 1); lim->flags &= ~BLK_FLAG_MISALIGNED; }
if (!(lim->features & BLK_FEAT_WRITE_CACHE)) lim->features &= ~BLK_FEAT_FUA;
blk_validate_atomic_write_limits(lim);
err = blk_validate_integrity_limits(lim); if (err) return err; return blk_validate_zoned_limits(lim);}EXPORT_SYMBOL_GPL(blk_validate_limits);
/* * Set the default limits for a newly allocated queue. @lim contains the * initial limits set by the driver, which could be no limit in which case * all fields are cleared to zero. */int blk_set_default_limits(struct queue_limits *lim){ /* * Most defaults are set by capping the bounds in blk_validate_limits, * but these limits are special and need an explicit initialization to * the max value here. */ lim->max_user_discard_sectors = UINT_MAX; lim->max_user_wzeroes_unmap_sectors = UINT_MAX; return blk_validate_limits(lim);}
/** * queue_limits_commit_update - commit an atomic update of queue limits * @q: queue to update * @lim: limits to apply * * Apply the limits in @lim that were obtained from queue_limits_start_update() * and updated by the caller to @q. The caller must have frozen the queue or * ensure that there are no outstanding I/Os by other means. * * Returns 0 if successful, else a negative error code. */int queue_limits_commit_update(struct request_queue *q, struct queue_limits *lim){ int error;
lockdep_assert_held(&q->limits_lock);
error = blk_validate_limits(lim); if (error) goto out_unlock;
#ifdef CONFIG_BLK_INLINE_ENCRYPTION if (q->crypto_profile && lim->integrity.tag_size) { pr_warn("blk-integrity: Integrity and hardware inline encryption are not supported together.\n"); error = -EINVAL; goto out_unlock; }#endif
q->limits = *lim; if (q->disk) blk_apply_bdi_limits(q->disk->bdi, lim);out_unlock: mutex_unlock(&q->limits_lock); return error;}EXPORT_SYMBOL_GPL(queue_limits_commit_update);
/** * queue_limits_commit_update_frozen - commit an atomic update of queue limits * @q: queue to update * @lim: limits to apply * * Apply the limits in @lim that were obtained from queue_limits_start_update() * and updated with the new values by the caller to @q. Freezes the queue * before the update and unfreezes it after. * * Returns 0 if successful, else a negative error code. */int queue_limits_commit_update_frozen(struct request_queue *q, struct queue_limits *lim){ unsigned int memflags; int ret;
memflags = blk_mq_freeze_queue(q); ret = queue_limits_commit_update(q, lim); blk_mq_unfreeze_queue(q, memflags);
return ret;}EXPORT_SYMBOL_GPL(queue_limits_commit_update_frozen);
/** * queue_limits_set - apply queue limits to queue * @q: queue to update * @lim: limits to apply * * Apply the limits in @lim that were freshly initialized to @q. * To update existing limits use queue_limits_start_update() and * queue_limits_commit_update() instead. * * Returns 0 if successful, else a negative error code. */int queue_limits_set(struct request_queue *q, struct queue_limits *lim){ mutex_lock(&q->limits_lock); return queue_limits_commit_update(q, lim);}EXPORT_SYMBOL_GPL(queue_limits_set);
static int queue_limit_alignment_offset(const struct queue_limits *lim, sector_t sector){ unsigned int granularity = max(lim->physical_block_size, lim->io_min); unsigned int alignment = sector_div(sector, granularity >> SECTOR_SHIFT) << SECTOR_SHIFT;
return (granularity + lim->alignment_offset - alignment) % granularity;}
static unsigned int queue_limit_discard_alignment( const struct queue_limits *lim, sector_t sector){ unsigned int alignment, granularity, offset;
if (!lim->max_discard_sectors) return 0;
/* Why are these in bytes, not sectors? */ alignment = lim->discard_alignment >> SECTOR_SHIFT; granularity = lim->discard_granularity >> SECTOR_SHIFT;
/* Offset of the partition start in 'granularity' sectors */ offset = sector_div(sector, granularity);
/* And why do we do this modulus *again* in blkdev_issue_discard()? */ offset = (granularity + alignment - offset) % granularity;
/* Turn it back into bytes, gaah */ return offset << SECTOR_SHIFT;}
static unsigned int blk_round_down_sectors(unsigned int sectors, unsigned int lbs){ sectors = round_down(sectors, lbs >> SECTOR_SHIFT); if (sectors < PAGE_SIZE >> SECTOR_SHIFT) sectors = PAGE_SIZE >> SECTOR_SHIFT; return sectors;}
/* Check if second and later bottom devices are compliant */static bool blk_stack_atomic_writes_tail(struct queue_limits *t, struct queue_limits *b){ /* We're not going to support different boundary sizes.. yet */ if (t->atomic_write_hw_boundary != b->atomic_write_hw_boundary) return false;
/* Can't support this */ if (t->atomic_write_hw_unit_min > b->atomic_write_hw_unit_max) return false;
/* Or this */ if (t->atomic_write_hw_unit_max < b->atomic_write_hw_unit_min) return false;
t->atomic_write_hw_max = min(t->atomic_write_hw_max, b->atomic_write_hw_max); t->atomic_write_hw_unit_min = max(t->atomic_write_hw_unit_min, b->atomic_write_hw_unit_min); t->atomic_write_hw_unit_max = min(t->atomic_write_hw_unit_max, b->atomic_write_hw_unit_max); return true;}
static void blk_stack_atomic_writes_chunk_sectors(struct queue_limits *t){ unsigned int chunk_bytes;
if (!t->chunk_sectors) return;
/* * If chunk sectors is so large that its value in bytes overflows * UINT_MAX, then just shift it down so it definitely will fit. * We don't support atomic writes of such a large size anyway. */ if (check_shl_overflow(t->chunk_sectors, SECTOR_SHIFT, &chunk_bytes)) chunk_bytes = t->chunk_sectors;
/* * Find values for limits which work for chunk size. * b->atomic_write_hw_unit_{min, max} may not be aligned with chunk * size, as the chunk size is not restricted to a power-of-2. * So we need to find highest power-of-2 which works for the chunk * size. * As an example scenario, we could have t->unit_max = 16K and * t->chunk_sectors = 24KB. For this case, reduce t->unit_max to a * value aligned with both limits, i.e. 8K in this example. */ t->atomic_write_hw_unit_max = min(t->atomic_write_hw_unit_max, max_pow_of_two_factor(chunk_bytes));
t->atomic_write_hw_unit_min = min(t->atomic_write_hw_unit_min, t->atomic_write_hw_unit_max); t->atomic_write_hw_max = min(t->atomic_write_hw_max, chunk_bytes);}
/* Check stacking of first bottom device */static bool blk_stack_atomic_writes_head(struct queue_limits *t, struct queue_limits *b){ if (!blk_valid_atomic_writes_boundary(t->chunk_sectors, b->atomic_write_hw_boundary >> SECTOR_SHIFT)) return false;
t->atomic_write_hw_unit_max = b->atomic_write_hw_unit_max; t->atomic_write_hw_unit_min = b->atomic_write_hw_unit_min; t->atomic_write_hw_max = b->atomic_write_hw_max; t->atomic_write_hw_boundary = b->atomic_write_hw_boundary; return true;}
static void blk_stack_atomic_writes_limits(struct queue_limits *t, struct queue_limits *b, sector_t start){ if (!(b->features & BLK_FEAT_ATOMIC_WRITES)) goto unsupported;
if (!b->atomic_write_hw_unit_min) goto unsupported;
if (!blk_atomic_write_start_sect_aligned(start, b)) goto unsupported;
/* UINT_MAX indicates no stacking of bottom devices yet */ if (t->atomic_write_hw_max == UINT_MAX) { if (!blk_stack_atomic_writes_head(t, b)) goto unsupported; } else { if (!blk_stack_atomic_writes_tail(t, b)) goto unsupported; } blk_stack_atomic_writes_chunk_sectors(t); return;
unsupported: t->atomic_write_hw_max = 0; t->atomic_write_hw_unit_max = 0; t->atomic_write_hw_unit_min = 0; t->atomic_write_hw_boundary = 0;}
/** * blk_stack_limits - adjust queue_limits for stacked devices * @t: the stacking driver limits (top device) * @b: the underlying queue limits (bottom, component device) * @start: first data sector within component device * * Description: * This function is used by stacking drivers like MD and DM to ensure * that all component devices have compatible block sizes and * alignments. The stacking driver must provide a queue_limits * struct (top) and then iteratively call the stacking function for * all component (bottom) devices. The stacking function will * attempt to combine the values and ensure proper alignment. * * Returns 0 if the top and bottom queue_limits are compatible. The * top device's block sizes and alignment offsets may be adjusted to * ensure alignment with the bottom device. If no compatible sizes * and alignments exist, -1 is returned and the resulting top * queue_limits will have the misaligned flag set to indicate that * the alignment_offset is undefined. */int blk_stack_limits(struct queue_limits *t, struct queue_limits *b, sector_t start){ unsigned int top, bottom, alignment; int ret = 0;
t->features |= (b->features & BLK_FEAT_INHERIT_MASK);
/* * Some feaures need to be supported both by the stacking driver and all * underlying devices. The stacking driver sets these flags before * stacking the limits, and this will clear the flags if any of the * underlying devices does not support it. */ if (!(b->features & BLK_FEAT_NOWAIT)) t->features &= ~BLK_FEAT_NOWAIT; if (!(b->features & BLK_FEAT_POLL)) t->features &= ~BLK_FEAT_POLL; if (!(b->features & BLK_FEAT_PCI_P2PDMA)) t->features &= ~BLK_FEAT_PCI_P2PDMA;
t->flags |= (b->flags & BLK_FLAG_MISALIGNED);
t->max_sectors = min_not_zero(t->max_sectors, b->max_sectors); t->max_user_sectors = min_not_zero(t->max_user_sectors, b->max_user_sectors); t->max_hw_sectors = min_not_zero(t->max_hw_sectors, b->max_hw_sectors); t->max_dev_sectors = min_not_zero(t->max_dev_sectors, b->max_dev_sectors); t->max_write_zeroes_sectors = min(t->max_write_zeroes_sectors, b->max_write_zeroes_sectors); t->max_user_wzeroes_unmap_sectors = min(t->max_user_wzeroes_unmap_sectors, b->max_user_wzeroes_unmap_sectors); t->max_hw_wzeroes_unmap_sectors = min(t->max_hw_wzeroes_unmap_sectors, b->max_hw_wzeroes_unmap_sectors);
t->max_hw_zone_append_sectors = min(t->max_hw_zone_append_sectors, b->max_hw_zone_append_sectors);
t->seg_boundary_mask = min_not_zero(t->seg_boundary_mask, b->seg_boundary_mask); t->virt_boundary_mask = min_not_zero(t->virt_boundary_mask, b->virt_boundary_mask);
t->max_segments = min_not_zero(t->max_segments, b->max_segments); t->max_discard_segments = min_not_zero(t->max_discard_segments, b->max_discard_segments); t->max_integrity_segments = min_not_zero(t->max_integrity_segments, b->max_integrity_segments);
t->max_segment_size = min_not_zero(t->max_segment_size, b->max_segment_size);
alignment = queue_limit_alignment_offset(b, start);
/* Bottom device has different alignment. Check that it is * compatible with the current top alignment. */ if (t->alignment_offset != alignment) {
top = max(t->physical_block_size, t->io_min) + t->alignment_offset; bottom = max(b->physical_block_size, b->io_min) + alignment;
/* Verify that top and bottom intervals line up */ if (max(top, bottom) % min(top, bottom)) { t->flags |= BLK_FLAG_MISALIGNED; ret = -1; } }
t->logical_block_size = max(t->logical_block_size, b->logical_block_size);
t->physical_block_size = max(t->physical_block_size, b->physical_block_size);
t->io_min = max(t->io_min, b->io_min); t->io_opt = lcm_not_zero(t->io_opt, b->io_opt); t->dma_alignment = max(t->dma_alignment, b->dma_alignment);
/* Set non-power-of-2 compatible chunk_sectors boundary */ if (b->chunk_sectors) t->chunk_sectors = gcd(t->chunk_sectors, b->chunk_sectors);
/* Physical block size a multiple of the logical block size? */ if (t->physical_block_size & (t->logical_block_size - 1)) { t->physical_block_size = t->logical_block_size; t->flags |= BLK_FLAG_MISALIGNED; ret = -1; }
/* Minimum I/O a multiple of the physical block size? */ if (t->io_min & (t->physical_block_size - 1)) { t->io_min = t->physical_block_size; t->flags |= BLK_FLAG_MISALIGNED; ret = -1; }
/* Optimal I/O a multiple of the physical block size? */ if (t->io_opt & (t->physical_block_size - 1)) { t->io_opt = 0; t->flags |= BLK_FLAG_MISALIGNED; ret = -1; }
/* chunk_sectors a multiple of the physical block size? */ if (t->chunk_sectors % (t->physical_block_size >> SECTOR_SHIFT)) { t->chunk_sectors = 0; t->flags |= BLK_FLAG_MISALIGNED; ret = -1; }
/* Find lowest common alignment_offset */ t->alignment_offset = lcm_not_zero(t->alignment_offset, alignment) % max(t->physical_block_size, t->io_min);
/* Verify that new alignment_offset is on a logical block boundary */ if (t->alignment_offset & (t->logical_block_size - 1)) { t->flags |= BLK_FLAG_MISALIGNED; ret = -1; }
t->max_sectors = blk_round_down_sectors(t->max_sectors, t->logical_block_size); t->max_hw_sectors = blk_round_down_sectors(t->max_hw_sectors, t->logical_block_size); t->max_dev_sectors = blk_round_down_sectors(t->max_dev_sectors, t->logical_block_size);
/* Discard alignment and granularity */ if (b->discard_granularity) { alignment = queue_limit_discard_alignment(b, start);
t->max_discard_sectors = min_not_zero(t->max_discard_sectors, b->max_discard_sectors); t->max_hw_discard_sectors = min_not_zero(t->max_hw_discard_sectors, b->max_hw_discard_sectors); t->discard_granularity = max(t->discard_granularity, b->discard_granularity); t->discard_alignment = lcm_not_zero(t->discard_alignment, alignment) % t->discard_granularity; } t->max_secure_erase_sectors = min_not_zero(t->max_secure_erase_sectors, b->max_secure_erase_sectors); t->zone_write_granularity = max(t->zone_write_granularity, b->zone_write_granularity); if (!(t->features & BLK_FEAT_ZONED)) { t->zone_write_granularity = 0; t->max_zone_append_sectors = 0; } blk_stack_atomic_writes_limits(t, b, start);
return ret;}EXPORT_SYMBOL(blk_stack_limits);
/** * queue_limits_stack_bdev - adjust queue_limits for stacked devices * @t: the stacking driver limits (top device) * @bdev: the underlying block device (bottom) * @offset: offset to beginning of data within component device * @pfx: prefix to use for warnings logged * * Description: * This function is used by stacking drivers like MD and DM to ensure * that all component devices have compatible block sizes and * alignments. The stacking driver must provide a queue_limits * struct (top) and then iteratively call the stacking function for * all component (bottom) devices. The stacking function will * attempt to combine the values and ensure proper alignment. */void queue_limits_stack_bdev(struct queue_limits *t, struct block_device *bdev, sector_t offset, const char *pfx){ if (blk_stack_limits(t, bdev_limits(bdev), get_start_sect(bdev) + offset)) pr_notice("%s: Warning: Device %pg is misaligned\n", pfx, bdev);}EXPORT_SYMBOL_GPL(queue_limits_stack_bdev);
/** * queue_limits_stack_integrity - stack integrity profile * @t: target queue limits * @b: base queue limits * * Check if the integrity profile in the @b can be stacked into the * target @t. Stacking is possible if either: * * a) does not have any integrity information stacked into it yet * b) the integrity profile in @b is identical to the one in @t * * If @b can be stacked into @t, return %true. Else return %false and clear the * integrity information in @t. */bool queue_limits_stack_integrity(struct queue_limits *t, struct queue_limits *b){ struct blk_integrity *ti = &t->integrity; struct blk_integrity *bi = &b->integrity;
if (!IS_ENABLED(CONFIG_BLK_DEV_INTEGRITY)) return true;
if (ti->flags & BLK_INTEGRITY_STACKED) { if (ti->metadata_size != bi->metadata_size) goto incompatible; if (ti->interval_exp != bi->interval_exp) goto incompatible; if (ti->tag_size != bi->tag_size) goto incompatible; if (ti->csum_type != bi->csum_type) goto incompatible; if (ti->pi_tuple_size != bi->pi_tuple_size) goto incompatible; if ((ti->flags & BLK_INTEGRITY_REF_TAG) != (bi->flags & BLK_INTEGRITY_REF_TAG)) goto incompatible; if ((ti->flags & BLK_SPLIT_INTERVAL_CAPABLE) && !(bi->flags & BLK_SPLIT_INTERVAL_CAPABLE)) ti->flags &= ~BLK_SPLIT_INTERVAL_CAPABLE; } else { ti->flags = BLK_INTEGRITY_STACKED; ti->flags |= (bi->flags & BLK_INTEGRITY_DEVICE_CAPABLE) | (bi->flags & BLK_INTEGRITY_REF_TAG) | (bi->flags & BLK_SPLIT_INTERVAL_CAPABLE); ti->csum_type = bi->csum_type; ti->pi_tuple_size = bi->pi_tuple_size; ti->metadata_size = bi->metadata_size; ti->pi_offset = bi->pi_offset; ti->interval_exp = bi->interval_exp; ti->tag_size = bi->tag_size; } return true;
incompatible: memset(ti, 0, sizeof(*ti)); return false;}EXPORT_SYMBOL_GPL(queue_limits_stack_integrity);
/** * blk_set_queue_depth - tell the block layer about the device queue depth * @q: the request queue for the device * @depth: queue depth * */void blk_set_queue_depth(struct request_queue *q, unsigned int depth){ q->queue_depth = depth; rq_qos_queue_depth_changed(q);}EXPORT_SYMBOL(blk_set_queue_depth);
int bdev_alignment_offset(struct block_device *bdev){ struct request_queue *q = bdev_get_queue(bdev);
if (q->limits.flags & BLK_FLAG_MISALIGNED) return -1; if (bdev_is_partition(bdev)) return queue_limit_alignment_offset(&q->limits, bdev->bd_start_sect); return q->limits.alignment_offset;}EXPORT_SYMBOL_GPL(bdev_alignment_offset);
unsigned int bdev_discard_alignment(struct block_device *bdev){ struct request_queue *q = bdev_get_queue(bdev);
if (bdev_is_partition(bdev)) return queue_limit_discard_alignment(&q->limits, bdev->bd_start_sect); return q->limits.discard_alignment;}EXPORT_SYMBOL_GPL(bdev_discard_alignment);