block: add an API to atomically update queue limits

Add a new queue_limits_{start,commit}_update pair of functions that
allows taking an atomic snapshot of queue limits, update it, and
commit it if it passes validity checking.  Also use the low-level
validation helper to implement blk_set_default_limits instead of
duplicating the initialization.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Link: https://lore.kernel.org/r/20240213073425.1621680-5-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/block/blk-core.c b/block/blk-core.c
index 2b11d8325fde6868c98af46cf9a39731c396c4c7..cb56724a8dfb25b2fd3d623c2778690f53744625 100644 (file)
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -425,6 +425,7 @@ struct request_queue *blk_alloc_queue(int node_id)
        mutex_init(&q->debugfs_mutex);
        mutex_init(&q->sysfs_lock);
        mutex_init(&q->sysfs_dir_lock);
+       mutex_init(&q->limits_lock);
        mutex_init(&q->rq_qos_mutex);
        spin_lock_init(&q->queue_lock);
 

diff --git a/block/blk-settings.c b/block/blk-settings.c
index 24042f6b33d54ec5f065564b1914332a2b6a3431..786b369ca59995372d88558770b0737aa08bd967 100644 (file)
--- a/block/blk-settings.c
+++ b/block/blk-settings.c
@@ -25,42 +25,6 @@ void blk_queue_rq_timeout(struct request_queue *q, unsigned int timeout)
 }
 EXPORT_SYMBOL_GPL(blk_queue_rq_timeout);
 
-/**
- * blk_set_default_limits - reset limits to default values
- * @lim:  the queue_limits structure to reset
- *
- * Description:
- *   Returns a queue_limit struct to its default state.
- */
-void blk_set_default_limits(struct queue_limits *lim)
-{
-       lim->max_segments = BLK_MAX_SEGMENTS;
-       lim->max_discard_segments = 1;
-       lim->max_integrity_segments = 0;
-       lim->seg_boundary_mask = BLK_SEG_BOUNDARY_MASK;
-       lim->virt_boundary_mask = 0;
-       lim->max_segment_size = BLK_MAX_SEGMENT_SIZE;
-       lim->max_sectors = lim->max_hw_sectors = BLK_SAFE_MAX_SECTORS;
-       lim->max_user_sectors = lim->max_dev_sectors = 0;
-       lim->chunk_sectors = 0;
-       lim->max_write_zeroes_sectors = 0;
-       lim->max_zone_append_sectors = 0;
-       lim->max_discard_sectors = 0;
-       lim->max_hw_discard_sectors = 0;
-       lim->max_secure_erase_sectors = 0;
-       lim->discard_granularity = 512;
-       lim->discard_alignment = 0;
-       lim->discard_misaligned = 0;
-       lim->logical_block_size = lim->physical_block_size = lim->io_min = 512;
-       lim->bounce = BLK_BOUNCE_NONE;
-       lim->alignment_offset = 0;
-       lim->io_opt = 0;
-       lim->misaligned = 0;
-       lim->zoned = false;
-       lim->zone_write_granularity = 0;
-       lim->dma_alignment = 511;
-}
-
 /**
  * blk_set_stacking_limits - set default limits for stacking devices
  * @lim:  the queue_limits structure to reset
@@ -101,6 +65,198 @@ static void blk_apply_bdi_limits(struct backing_dev_info *bdi,
        bdi->io_pages = lim->max_sectors >> PAGE_SECTORS_SHIFT;
 }
 
+static int blk_validate_zoned_limits(struct queue_limits *lim)
+{
+       if (!lim->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;
+
+       if (lim->zone_write_granularity < lim->logical_block_size)
+               lim->zone_write_granularity = lim->logical_block_size;
+
+       if (lim->max_zone_append_sectors) {
+               /*
+                * The Zone Append size is limited by the maximum I/O size
+                * and the zone size given that it can't span zones.
+                */
+               lim->max_zone_append_sectors =
+                       min3(lim->max_hw_sectors,
+                            lim->max_zone_append_sectors,
+                            lim->chunk_sectors);
+       }
+
+       return 0;
+}
+
+/*
+ * Check that the limits in lim are valid, initialize defaults for unset
+ * values, and cap values based on others where needed.
+ */
+static int blk_validate_limits(struct queue_limits *lim)
+{
+       unsigned int max_hw_sectors;
+
+       /*
+        * 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;
+       if (lim->physical_block_size < lim->logical_block_size)
+               lim->physical_block_size = lim->logical_block_size;
+
+       /*
+        * 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;
+
+       /*
+        * 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;
+       lim->max_hw_sectors = round_down(lim->max_hw_sectors,
+                       lim->logical_block_size >> SECTOR_SHIFT);
+
+       /*
+        * 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 > max_hw_sectors ||
+                   lim->max_user_sectors < PAGE_SIZE / SECTOR_SIZE)
+                       return -EINVAL;
+               lim->max_sectors = min(max_hw_sectors, lim->max_user_sectors);
+       } else {
+               lim->max_sectors = min(max_hw_sectors, BLK_DEF_MAX_SECTORS_CAP);
+       }
+       lim->max_sectors = round_down(lim->max_sectors,
+                       lim->logical_block_size >> SECTOR_SHIFT);
+
+       /*
+        * 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;
+
+       lim->max_discard_sectors = lim->max_hw_discard_sectors;
+       if (!lim->max_discard_segments)
+               lim->max_discard_segments = 1;
+
+       if (lim->discard_granularity < lim->physical_block_size)
+               lim->discard_granularity = lim->physical_block_size;
+
+       /*
+        * 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 < PAGE_SIZE - 1))
+               return -EINVAL;
+
+       /*
+        * 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 < PAGE_SIZE))
+               return -EINVAL;
+
+       /*
+        * Devices that require a virtual boundary do not support scatter/gather
+        * I/O natively, but instead require a descriptor list entry for each
+        * page (which might not be identical to the Linux PAGE_SIZE).  Because
+        * of that they are not limited by our notion of "segment size".
+        */
+       if (lim->virt_boundary_mask) {
+               if (WARN_ON_ONCE(lim->max_segment_size &&
+                                lim->max_segment_size != UINT_MAX))
+                       return -EINVAL;
+               lim->max_segment_size = UINT_MAX;
+       }
+
+       /*
+        * 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->misaligned = 0;
+       }
+
+       return blk_validate_zoned_limits(lim);
+}
+
+/*
+ * 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)
+{
+       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.
+ *
+ * Returns 0 if successful, else a negative error code.
+ */
+int queue_limits_commit_update(struct request_queue *q,
+               struct queue_limits *lim)
+       __releases(q->limits_lock)
+{
+       int error = blk_validate_limits(lim);
+
+       if (!error) {
+               q->limits = *lim;
+               if (q->disk)
+                       blk_apply_bdi_limits(q->disk->bdi, lim);
+       }
+       mutex_unlock(&q->limits_lock);
+       return error;
+}
+EXPORT_SYMBOL_GPL(queue_limits_commit_update);
+
 /**
  * blk_queue_bounce_limit - set bounce buffer limit for queue
  * @q: the request queue for the device

diff --git a/block/blk.h b/block/blk.h
index 913c93838a01bf254e546319c979c9d912917cc2..43c7e9180b3028f0f9722aa9ea90fdaf6cf5fc82 100644 (file)
--- a/block/blk.h
+++ b/block/blk.h
@@ -330,7 +330,7 @@ void blk_rq_set_mixed_merge(struct request *rq);
 bool blk_rq_merge_ok(struct request *rq, struct bio *bio);
 enum elv_merge blk_try_merge(struct request *rq, struct bio *bio);
 
-void blk_set_default_limits(struct queue_limits *lim);
+int blk_set_default_limits(struct queue_limits *lim);
 int blk_dev_init(void);
 
 /*

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 251a11d2d2aeff922bc176a0a07907c99bcb7759..d41d7fe934578fef2da4598a24ae8e751050df04 100644 (file)
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -474,6 +474,7 @@ struct request_queue {
 
        struct mutex            sysfs_lock;
        struct mutex            sysfs_dir_lock;
+       struct mutex            limits_lock;
 
        /*
         * for reusing dead hctx instance in case of updating
@@ -862,6 +863,28 @@ static inline unsigned int blk_chunk_sectors_left(sector_t offset,
        return chunk_sectors - (offset & (chunk_sectors - 1));
 }
 
+/**
+ * queue_limits_start_update - start an atomic update of queue limits
+ * @q:         queue to update
+ *
+ * This functions starts an atomic update of the queue limits.  It takes a lock
+ * to prevent other updates and returns a snapshot of the current limits that
+ * the caller can modify.  The caller must call queue_limits_commit_update()
+ * to finish the update.
+ *
+ * Context: process context.  The caller must have frozen the queue or ensured
+ * that there is outstanding I/O by other means.
+ */
+static inline struct queue_limits
+queue_limits_start_update(struct request_queue *q)
+       __acquires(q->limits_lock)
+{
+       mutex_lock(&q->limits_lock);
+       return q->limits;
+}
+int queue_limits_commit_update(struct request_queue *q,
+               struct queue_limits *lim);
+
 /*
  * Access functions for manipulating queue properties
  */