From 178053e2f1f9ccdb61ff6c2bd8644b53fc98e72e Mon Sep 17 00:00:00 2001 From: Damien Le Moal Date: Fri, 28 Oct 2016 17:45:05 +0900 Subject: [PATCH] f2fs: Cache zoned block devices zone type With the zoned block device feature enabled, section discard need to do a zone reset for sections contained in sequential zones, and a regular discard (if supported) for sections stored in conventional zones. Avoid the need for a costly report zones to obtain a section zone type when discarding it by caching the types of the device zones in the super block information. This cache is initialized at mount time for mounts with the zoned block device feature enabled. Signed-off-by: Damien Le Moal Signed-off-by: Jaegeuk Kim --- fs/f2fs/f2fs.h | 18 +++++++++++++ fs/f2fs/super.c | 72 +++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 90 insertions(+) diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h index 707beab1afec..a6e2ede94b08 100644 --- a/fs/f2fs/f2fs.h +++ b/fs/f2fs/f2fs.h @@ -756,6 +756,14 @@ struct f2fs_sb_info { u8 key_prefix[F2FS_KEY_DESC_PREFIX_SIZE]; u8 key_prefix_size; #endif + +#ifdef CONFIG_BLK_DEV_ZONED + unsigned int nr_blkz; /* Total number of zones */ + unsigned int blocks_per_blkz; /* F2FS blocks per zone */ + unsigned int log_blocks_per_blkz; /* log2 F2FS blocks per zone */ + u8 *blkz_type; /* Array of zones type */ +#endif + /* for node-related operations */ struct f2fs_nm_info *nm_info; /* node manager */ struct inode *node_inode; /* cache node blocks */ @@ -2416,6 +2424,16 @@ static inline int f2fs_sb_mounted_blkzoned(struct super_block *sb) return F2FS_HAS_FEATURE(sb, F2FS_FEATURE_BLKZONED); } +#ifdef CONFIG_BLK_DEV_ZONED +static inline int get_blkz_type(struct f2fs_sb_info *sbi, + block_t blkaddr) +{ + unsigned int zno = blkaddr >> sbi->log_blocks_per_blkz; + + return sbi->blkz_type[zno]; +} +#endif + static inline bool f2fs_discard_en(struct f2fs_sb_info *sbi) { struct request_queue *q = bdev_get_queue(sbi->sb->s_bdev); diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c index 3312284aa245..12a4f3f44a2f 100644 --- a/fs/f2fs/super.c +++ b/fs/f2fs/super.c @@ -1511,6 +1511,65 @@ static int init_percpu_info(struct f2fs_sb_info *sbi) GFP_KERNEL); } +#ifdef CONFIG_BLK_DEV_ZONED +static int init_blkz_info(struct f2fs_sb_info *sbi) +{ + struct block_device *bdev = sbi->sb->s_bdev; + sector_t nr_sectors = bdev->bd_part->nr_sects; + sector_t sector = 0; + struct blk_zone *zones; + unsigned int i, nr_zones; + unsigned int n = 0; + int err = -EIO; + + if (!f2fs_sb_mounted_blkzoned(sbi->sb)) + return 0; + + sbi->blocks_per_blkz = SECTOR_TO_BLOCK(bdev_zone_size(bdev)); + sbi->log_blocks_per_blkz = __ilog2_u32(sbi->blocks_per_blkz); + sbi->nr_blkz = SECTOR_TO_BLOCK(nr_sectors) >> + sbi->log_blocks_per_blkz; + if (nr_sectors & (bdev_zone_size(bdev) - 1)) + sbi->nr_blkz++; + + sbi->blkz_type = kmalloc(sbi->nr_blkz, GFP_KERNEL); + if (!sbi->blkz_type) + return -ENOMEM; + +#define F2FS_REPORT_NR_ZONES 4096 + + zones = kcalloc(F2FS_REPORT_NR_ZONES, sizeof(struct blk_zone), + GFP_KERNEL); + if (!zones) + return -ENOMEM; + + /* Get block zones type */ + while (zones && sector < nr_sectors) { + + nr_zones = F2FS_REPORT_NR_ZONES; + err = blkdev_report_zones(bdev, sector, + zones, &nr_zones, + GFP_KERNEL); + if (err) + break; + if (!nr_zones) { + err = -EIO; + break; + } + + for (i = 0; i < nr_zones; i++) { + sbi->blkz_type[n] = zones[i].type; + sector += zones[i].len; + n++; + } + } + + kfree(zones); + + return err; +} +#endif + /* * Read f2fs raw super block. * Because we have two copies of super block, so read both of them @@ -1757,6 +1816,15 @@ try_onemore: init_ino_entry_info(sbi); +#ifdef CONFIG_BLK_DEV_ZONED + err = init_blkz_info(sbi); + if (err) { + f2fs_msg(sb, KERN_ERR, + "Failed to initialize F2FS blkzone information"); + goto free_blkz; + } +#endif + /* setup f2fs internal modules */ err = build_segment_manager(sbi); if (err) { @@ -1935,6 +2003,10 @@ free_nm: destroy_node_manager(sbi); free_sm: destroy_segment_manager(sbi); +#ifdef CONFIG_BLK_DEV_ZONED +free_blkz: + kfree(sbi->blkz_type); +#endif kfree(sbi->ckpt); free_meta_inode: make_bad_inode(sbi->meta_inode); -- 2.20.1