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authorJan Kara <jack@suse.cz>2017-04-12 13:24:37 +0300
committerJens Axboe <axboe@fb.com>2017-04-20 21:09:55 +0300
commitfa06052d637bf3a76f18cd2304048b866af4096e (patch)
tree7516fc2e1008907e50a7f860d3f21aee65638223 /drivers/mtd/mtdsuper.c
parentedd3ba94c4e5ef6ec045d5730d365d557fb54f98 (diff)
downloadlinux-fa06052d637bf3a76f18cd2304048b866af4096e.tar.xz
mtd: Convert to dynamically allocated bdi infrastructure
MTD already allocates backing_dev_info dynamically. Convert it to use generic infrastructure for this including proper refcounting. We drop mtd->backing_dev_info as its only use was to pass mtd_bdi pointer from one file into another and if we wanted to keep that in a clean way, we'd have to make mtd hold and drop bdi reference as needed which seems pointless for passing one global pointer... CC: David Woodhouse <dwmw2@infradead.org> CC: Brian Norris <computersforpeace@gmail.com> CC: linux-mtd@lists.infradead.org Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'drivers/mtd/mtdsuper.c')
-rw-r--r--drivers/mtd/mtdsuper.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/mtd/mtdsuper.c b/drivers/mtd/mtdsuper.c
index 20c02a3b7417..e69e7855e31f 100644
--- a/drivers/mtd/mtdsuper.c
+++ b/drivers/mtd/mtdsuper.c
@@ -18,6 +18,7 @@
#include <linux/ctype.h>
#include <linux/slab.h>
#include <linux/major.h>
+#include <linux/backing-dev.h>
/*
* compare superblocks to see if they're equivalent
@@ -38,6 +39,8 @@ static int get_sb_mtd_compare(struct super_block *sb, void *_mtd)
return 0;
}
+extern struct backing_dev_info *mtd_bdi;
+
/*
* mark the superblock by the MTD device it is using
* - set the device number to be the correct MTD block device for pesuperstence
@@ -49,7 +52,9 @@ static int get_sb_mtd_set(struct super_block *sb, void *_mtd)
sb->s_mtd = mtd;
sb->s_dev = MKDEV(MTD_BLOCK_MAJOR, mtd->index);
- sb->s_bdi = mtd->backing_dev_info;
+ sb->s_bdi = bdi_get(mtd_bdi);
+ sb->s_iflags |= SB_I_DYNBDI;
+
return 0;
}