block: Kill gfp_t argument of blkdev_report_zones()

Only GFP_KERNEL and GFP_NOIO are used with blkdev_report_zones(). In
preparation of using vmalloc() for large report buffer and zone array
allocations used by this function, remove its "gfp_t gfp_mask" argument
and rely on the caller context to use memalloc_noio_save/restore() where
necessary (block layer zone revalidation and dm-zoned I/O error path).

Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

1 files changed, 12 insertions, 4 deletions

diff --git a/drivers/md/dm-zoned-metadata.c b/drivers/md/dm-zoned-metadata.c
index d8334cd45d7c..9faf3e49c7af 100644
--- a/drivers/md/dm-zoned-metadata.c
+++ b/drivers/md/dm-zoned-metadata.c
@@ -8,6 +8,7 @@
 
 #include <linux/module.h>
 #include <linux/crc32.h>
+#include <linux/sched/mm.h>
 
 #define DM_MSG_PREFIX           "zoned metadata"
 
@@ -1162,8 +1163,7 @@ static int dmz_init_zones(struct dmz_metadata *zmd)
         while (sector < dev->capacity) {
                 /* Get zone information */
                 nr_blkz = DMZ_REPORT_NR_ZONES;
-                ret = blkdev_report_zones(dev->bdev, sector, blkz,
-                                          &nr_blkz, GFP_KERNEL);
+                ret = blkdev_report_zones(dev->bdev, sector, blkz, &nr_blkz);
                 if (ret) {
                         dmz_dev_err(dev, "Report zones failed %d", ret);
                         goto out;
@@ -1201,12 +1201,20 @@ out:
 static int dmz_update_zone(struct dmz_metadata *zmd, struct dm_zone *zone)
 {
         unsigned int nr_blkz = 1;
+        unsigned int noio_flag;
         struct blk_zone blkz;
         int ret;
 
-        /* Get zone information from disk */
+        /*
+         * Get zone information from disk. Since blkdev_report_zones() uses
+         * GFP_KERNEL by default for memory allocations, set the per-task
+         * PF_MEMALLOC_NOIO flag so that all allocations are done as if
+         * GFP_NOIO was specified.
+         */
+        noio_flag = memalloc_noio_save();
         ret = blkdev_report_zones(zmd->dev->bdev, dmz_start_sect(zmd, zone),
-                                  &blkz, &nr_blkz, GFP_NOIO);
+                                  &blkz, &nr_blkz);
+        memalloc_noio_restore(noio_flag);
         if (!nr_blkz)
                 ret = -EIO;
         if (ret) {