This series addresses a reccuring problem with zone revalidation failures observed during extensive testing with memory constrained system and device hot-plugging. The problem source is failure to allocate large memory areas with alloc_pages() or kmalloc() in blk_revalidate_disk_zones() to store the disk array of zones (struct blk_zone) or in sd_zbc_report_zones() for the report zones command reply buffer. The solution proposed here is to: 1) limit the number of zones to be reported with a single report zones command execution, and 2) Use vmalloc to allocate large-ish arrays and buffers in place of alloc_pages() and kmalloc(). With these changes, tests do not show any zone revalidation failures while not impacting the time taken for a disk initial zone inspection during device scan. Damien Le Moal (3): block: Allow mapping of vmalloc-ed buffers sd_zbc: Fix report zones buffer allocation block: Limit zone array allocation size block/bio.c | 8 ++++- block/blk-zoned.c | 29 +++++++--------- drivers/scsi/sd_zbc.c | 79 +++++++++++++++++++++++++++++++----------- include/linux/blkdev.h | 5 +++ 4 files changed, 84 insertions(+), 37 deletions(-) -- 2.21.0
