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scsi: sd: sd_zbc: Don't pass GFP_NOIO to kvcalloc 

Dan reported we're passing in GFP_NOIO to kvmalloc() which will then
fallback to doing kmalloc() instead of an optional vmalloc() if the size
exceeds kmalloc()s limits. This will break with drives that have zone
numbers exceeding PAGE_SIZE/sizeof(u32).

Instead of passing in GFP_NOIO, enter an implicit GFP_NOIO allocation
scope.

Link: https://lore.kernel.org/r/YCuvSfKw4qEQBr/t@mwanda
Link: https://lore.kernel.org/r/5a6345e2989fd06c049ac4e4627f6acb492c15b8.1613569821.git.johannes.thumshirn@wdc.com
Fixes: 5795eb443060: ("scsi: sd_zbc: emulate ZONE_APPEND commands")
Cc: Damien Le Moal <Damien.LeMoal@wdc.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com>
Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Johannes Thumshirn 2021-02-17 22:52:45 +09:00 committed by Martin K. Petersen
parent c2f23a96c6
commit 9acced3f58
1 changed files with 5 additions and 1 deletions
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6
drivers/scsi/sd_zbc.c
View File

@ -688,6 +688,7 @@ int sd_zbc_revalidate_zones(struct scsi_disk *sdkp)
unsigned int nr_zones = sdkp->rev_nr_zones;
u32 max_append;
int ret = 0;
unsigned int flags;
/*
* For all zoned disks, initialize zone append emulation data if not
@ -720,16 +721,19 @@ int sd_zbc_revalidate_zones(struct scsi_disk *sdkp)
disk->queue->nr_zones == nr_zones)
goto unlock;
flags = memalloc_noio_save();
sdkp->zone_blocks = zone_blocks;
sdkp->nr_zones = nr_zones;
sdkp->rev_wp_offset = kvcalloc(nr_zones, sizeof(u32), GFP_NOIO);
sdkp->rev_wp_offset = kvcalloc(nr_zones, sizeof(u32), GFP_KERNEL);
if (!sdkp->rev_wp_offset) {
ret = -ENOMEM;
memalloc_noio_restore(flags);
goto unlock;
}
ret = blk_revalidate_disk_zones(disk, sd_zbc_revalidate_zones_cb);
memalloc_noio_restore(flags);
kvfree(sdkp->rev_wp_offset);
sdkp->rev_wp_offset = NULL;