Re: [PATCH 24/27] block: add a bdev_discard_granularity helper

Ryusuke Konishi
2022-04-06T18:27:10Z

On Wed, Apr 6, 2022 at 11:06 PM Christoph Hellwig <hch@lst.de> wrote:
>
> Abstract away implementation details from file systems by providing a
> block_device based helper to retreive the discard granularity.
>
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---
> block/blk-lib.c | 5 ++---
> drivers/block/drbd/drbd_nl.c | 9 +++++----
> drivers/block/drbd/drbd_receiver.c | 3 +--
> drivers/block/loop.c | 2 +-
> drivers/target/target_core_device.c | 3 +--
> fs/btrfs/ioctl.c | 12 ++++--------
> fs/exfat/file.c | 3 +--
> fs/ext4/mballoc.c | 6 +++---
> fs/f2fs/file.c | 3 +--
> fs/fat/file.c | 3 +--
> fs/gfs2/rgrp.c | 7 +++----
> fs/jfs/ioctl.c | 3 +--
> fs/nilfs2/ioctl.c | 4 ++--
> fs/ntfs3/file.c | 4 ++--
> fs/ntfs3/super.c | 6 ++----
> fs/ocfs2/ioctl.c | 3 +--
> fs/xfs/xfs_discard.c | 4 ++--
> include/linux/blkdev.h | 5 +++++
> 18 files changed, 38 insertions(+), 47 deletions(-)
>
> diff --git a/block/blk-lib.c b/block/blk-lib.c
> index 8b4b66d3a9bfc..43aa4d7fe859f 100644
> --- a/block/blk-lib.c
> +++ b/block/blk-lib.c
> @@ -12,8 +12,7 @@
>
> static sector_t bio_discard_limit(struct block_device *bdev, sector_t sector)
> {
> - unsigned int discard_granularity =
> - bdev_get_queue(bdev)->limits.discard_granularity;
> + unsigned int discard_granularity = bdev_discard_granularity(bdev);
> sector_t granularity_aligned_sector;
>
> if (bdev_is_partition(bdev))
> @@ -59,7 +58,7 @@ int __blkdev_issue_discard(struct block_device *bdev, sector_t sector,
> }
>
> /* In case the discard granularity isn't set by buggy device driver */
> - if (WARN_ON_ONCE(!q->limits.discard_granularity)) {
> + if (WARN_ON_ONCE(!bdev_discard_granularity(bdev))) {
> char dev_name[BDEVNAME_SIZE];
>
> bdevname(bdev, dev_name);
> diff --git a/drivers/block/drbd/drbd_nl.c b/drivers/block/drbd/drbd_nl.c
> index 8e28e0a8e5e41..94ac3737723a8 100644
> --- a/drivers/block/drbd/drbd_nl.c
> +++ b/drivers/block/drbd/drbd_nl.c
> @@ -1440,7 +1440,6 @@ static void sanitize_disk_conf(struct drbd_device *device, struct disk_conf *dis
> struct drbd_backing_dev *nbc)
> {
> struct block_device *bdev = nbc->backing_bdev;
> - struct request_queue *q = bdev->bd_disk->queue;
>
> if (disk_conf->al_extents < DRBD_AL_EXTENTS_MIN)
> disk_conf->al_extents = DRBD_AL_EXTENTS_MIN;
> @@ -1457,12 +1456,14 @@ static void sanitize_disk_conf(struct drbd_device *device, struct disk_conf *dis
> if (disk_conf->rs_discard_granularity) {
> int orig_value = disk_conf->rs_discard_granularity;
> sector_t discard_size = bdev_max_discard_sectors(bdev) << 9;
> + unsigned int discard_granularity = bdev_discard_granularity(bdev);
> int remainder;
>
> - if (q->limits.discard_granularity > disk_conf->rs_discard_granularity)
> - disk_conf->rs_discard_granularity = q->limits.discard_granularity;
> + if (discard_granularity > disk_conf->rs_discard_granularity)
> + disk_conf->rs_discard_granularity = discard_granularity;
>
> - remainder = disk_conf->rs_discard_granularity % q->limits.discard_granularity;
> + remainder = disk_conf->rs_discard_granularity %
> + discard_granularity;
> disk_conf->rs_discard_granularity += remainder;
>
> if (disk_conf->rs_discard_granularity > discard_size)
> diff --git a/drivers/block/drbd/drbd_receiver.c b/drivers/block/drbd/drbd_receiver.c
> index 8a4a47da56fe9..275c53c7b629e 100644
> --- a/drivers/block/drbd/drbd_receiver.c
> +++ b/drivers/block/drbd/drbd_receiver.c
> @@ -1511,7 +1511,6 @@ void drbd_bump_write_ordering(struct drbd_resource *resource, struct drbd_backin
> int drbd_issue_discard_or_zero_out(struct drbd_device *device, sector_t start, unsigned int nr_sectors, int flags)
> {
> struct block_device *bdev = device->ldev->backing_bdev;
> - struct request_queue *q = bdev_get_queue(bdev);
> sector_t tmp, nr;
> unsigned int max_discard_sectors, granularity;
> int alignment;
> @@ -1521,7 +1520,7 @@ int drbd_issue_discard_or_zero_out(struct drbd_device *device, sector_t start, u
> goto zero_out;
>
> /* Zero-sector (unknown) and one-sector granularities are the same. */
> - granularity = max(q->limits.discard_granularity >> 9, 1U);
> + granularity = max(bdev_discard_granularity(bdev) >> 9, 1U);
> alignment = (bdev_discard_alignment(bdev) >> 9) % granularity;
>
> max_discard_sectors = min(bdev_max_discard_sectors(bdev), (1U << 22));
> diff --git a/drivers/block/loop.c b/drivers/block/loop.c
> index 4b919b75205a7..d5499795a1fec 100644
> --- a/drivers/block/loop.c
> +++ b/drivers/block/loop.c
> @@ -759,7 +759,7 @@ static void loop_config_discard(struct loop_device *lo)
> struct request_queue *backingq = bdev_get_queue(I_BDEV(inode));
>
> max_discard_sectors = backingq->limits.max_write_zeroes_sectors;
> - granularity = backingq->limits.discard_granularity ?:
> + granularity = bdev_discard_granularity(I_BDEV(inode)) ?:
> queue_physical_block_size(backingq);
>
> /*
> diff --git a/drivers/target/target_core_device.c b/drivers/target/target_core_device.c
> index 7d510e4231713..ee93f0cca4228 100644
> --- a/drivers/target/target_core_device.c
> +++ b/drivers/target/target_core_device.c
> @@ -834,7 +834,6 @@ struct se_device *target_alloc_device(struct se_hba *hba, const char *name)
> bool target_configure_unmap_from_queue(struct se_dev_attrib *attrib,
> struct block_device *bdev)
> {
> - struct request_queue *q = bdev_get_queue(bdev);
> int block_size = bdev_logical_block_size(bdev);
>
> if (!bdev_max_discard_sectors(bdev))
> @@ -846,7 +845,7 @@ bool target_configure_unmap_from_queue(struct se_dev_attrib *attrib,
> * Currently hardcoded to 1 in Linux/SCSI code..
> */
> attrib->max_unmap_block_desc_count = 1;
> - attrib->unmap_granularity = q->limits.discard_granularity / block_size;
> + attrib->unmap_granularity = bdev_discard_granularity(bdev) / block_size;
> attrib->unmap_granularity_alignment =
> bdev_discard_alignment(bdev) / block_size;
> return true;
> diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
> index fc7953755fd8b..f1a1e9519808e 100644
> --- a/fs/btrfs/ioctl.c
> +++ b/fs/btrfs/ioctl.c
> @@ -468,7 +468,6 @@ static noinline int btrfs_ioctl_fitrim(struct btrfs_fs_info *fs_info,
> void __user *arg)
> {
> struct btrfs_device *device;
> - struct request_queue *q;
> struct fstrim_range range;
> u64 minlen = ULLONG_MAX;
> u64 num_devices = 0;
> @@ -498,14 +497,11 @@ static noinline int btrfs_ioctl_fitrim(struct btrfs_fs_info *fs_info,
> rcu_read_lock();
> list_for_each_entry_rcu(device, &fs_info->fs_devices->devices,
> dev_list) {
> - if (!device->bdev)
> + if (!device->bdev || !bdev_max_discard_sectors(device->bdev))
> continue;
> - q = bdev_get_queue(device->bdev);
> - if (bdev_max_discard_sectors(device->bdev)) {
> - num_devices++;
> - minlen = min_t(u64, q->limits.discard_granularity,
> - minlen);
> - }
> + num_devices++;
> + minlen = min_t(u64, bdev_discard_granularity(device->bdev),
> + minlen);
> }
> rcu_read_unlock();
>
> diff --git a/fs/exfat/file.c b/fs/exfat/file.c
> index 765e4f63dd18d..20d4e47f57ab2 100644
> --- a/fs/exfat/file.c
> +++ b/fs/exfat/file.c
> @@ -351,7 +351,6 @@ int exfat_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
>
> static int exfat_ioctl_fitrim(struct inode *inode, unsigned long arg)
> {
> - struct request_queue *q = bdev_get_queue(inode->i_sb->s_bdev);
> struct fstrim_range range;
> int ret = 0;
>
> @@ -365,7 +364,7 @@ static int exfat_ioctl_fitrim(struct inode *inode, unsigned long arg)
> return -EFAULT;
>
> range.minlen = max_t(unsigned int, range.minlen,
> - q->limits.discard_granularity);
> + bdev_discard_granularity(inode->i_sb->s_bdev));
>
> ret = exfat_trim_fs(inode, &range);
> if (ret < 0)
> diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
> index c3668c977cd99..6d1820536d88d 100644
> --- a/fs/ext4/mballoc.c
> +++ b/fs/ext4/mballoc.c
> @@ -6455,7 +6455,7 @@ ext4_trim_all_free(struct super_block *sb, ext4_group_t group,
> */
> int ext4_trim_fs(struct super_block *sb, struct fstrim_range *range)
> {
> - struct request_queue *q = bdev_get_queue(sb->s_bdev);
> + unsigned int discard_granularity = bdev_discard_granularity(sb->s_bdev);
> struct ext4_group_info *grp;
> ext4_group_t group, first_group, last_group;
> ext4_grpblk_t cnt = 0, first_cluster, last_cluster;
> @@ -6475,9 +6475,9 @@ int ext4_trim_fs(struct super_block *sb, struct fstrim_range *range)
> range->len < sb->s_blocksize)
> return -EINVAL;
> /* No point to try to trim less than discard granularity */
> - if (range->minlen < q->limits.discard_granularity) {
> + if (range->minlen < discard_granularity) {
> minlen = EXT4_NUM_B2C(EXT4_SB(sb),
> - q->limits.discard_granularity >> sb->s_blocksize_bits);
> + discard_granularity >> sb->s_blocksize_bits);
> if (minlen > EXT4_CLUSTERS_PER_GROUP(sb))
> goto out;
> }
> diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
> index 5b89af0f27f05..8053d99f3920b 100644
> --- a/fs/f2fs/file.c
> +++ b/fs/f2fs/file.c
> @@ -2285,7 +2285,6 @@ static int f2fs_ioc_fitrim(struct file *filp, unsigned long arg)
> {
> struct inode *inode = file_inode(filp);
> struct super_block *sb = inode->i_sb;
> - struct request_queue *q = bdev_get_queue(sb->s_bdev);
> struct fstrim_range range;
> int ret;
>
> @@ -2304,7 +2303,7 @@ static int f2fs_ioc_fitrim(struct file *filp, unsigned long arg)
> return ret;
>
> range.minlen = max((unsigned int)range.minlen,
> - q->limits.discard_granularity);
> + bdev_discard_granularity(sb->s_bdev));
> ret = f2fs_trim_fs(F2FS_SB(sb), &range);
> mnt_drop_write_file(filp);
> if (ret < 0)
> diff --git a/fs/fat/file.c b/fs/fat/file.c
> index e4c7d10e80129..bf91f977debea 100644
> --- a/fs/fat/file.c
> +++ b/fs/fat/file.c
> @@ -127,7 +127,6 @@ static int fat_ioctl_fitrim(struct inode *inode, unsigned long arg)
> struct super_block *sb = inode->i_sb;
> struct fstrim_range __user *user_range;
> struct fstrim_range range;
> - struct request_queue *q = bdev_get_queue(sb->s_bdev);
> int err;
>
> if (!capable(CAP_SYS_ADMIN))
> @@ -141,7 +140,7 @@ static int fat_ioctl_fitrim(struct inode *inode, unsigned long arg)
> return -EFAULT;
>
> range.minlen = max_t(unsigned int, range.minlen,
> - q->limits.discard_granularity);
> + bdev_discard_granularity(sb->s_bdev));
>
> err = fat_trim_fs(inode, &range);
> if (err < 0)
> diff --git a/fs/gfs2/rgrp.c b/fs/gfs2/rgrp.c
> index 7f20ac9133bc6..6d26bb5254844 100644
> --- a/fs/gfs2/rgrp.c
> +++ b/fs/gfs2/rgrp.c
> @@ -1386,7 +1386,7 @@ int gfs2_fitrim(struct file *filp, void __user *argp)
> {
> struct inode *inode = file_inode(filp);
> struct gfs2_sbd *sdp = GFS2_SB(inode);
> - struct request_queue *q = bdev_get_queue(sdp->sd_vfs->s_bdev);
> + struct block_device *bdev = sdp->sd_vfs->s_bdev;
> struct buffer_head *bh;
> struct gfs2_rgrpd *rgd;
> struct gfs2_rgrpd *rgd_end;
> @@ -1405,7 +1405,7 @@ int gfs2_fitrim(struct file *filp, void __user *argp)
> if (!test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags))
> return -EROFS;
>
> - if (!bdev_max_discard_sectors(sdp->sd_vfs->s_bdev))
> + if (!bdev_max_discard_sectors(bdev))
> return -EOPNOTSUPP;
>
> if (copy_from_user(&r, argp, sizeof(r)))
> @@ -1418,8 +1418,7 @@ int gfs2_fitrim(struct file *filp, void __user *argp)
> start = r.start >> bs_shift;
> end = start + (r.len >> bs_shift);
> minlen = max_t(u64, r.minlen, sdp->sd_sb.sb_bsize);
> - minlen = max_t(u64, minlen,
> - q->limits.discard_granularity) >> bs_shift;
> + minlen = max_t(u64, minlen, bdev_discard_granularity(bdev)) >> bs_shift;
>
> if (end <= start || minlen > sdp->sd_max_rg_data)
> return -EINVAL;
> diff --git a/fs/jfs/ioctl.c b/fs/jfs/ioctl.c
> index 357ae6e5c36ec..1e7b177ece605 100644
> --- a/fs/jfs/ioctl.c
> +++ b/fs/jfs/ioctl.c
> @@ -110,7 +110,6 @@ long jfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
> case FITRIM:
> {
> struct super_block *sb = inode->i_sb;
> - struct request_queue *q = bdev_get_queue(sb->s_bdev);
> struct fstrim_range range;
> s64 ret = 0;
>
> @@ -127,7 +126,7 @@ long jfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
> return -EFAULT;
>
> range.minlen = max_t(unsigned int, range.minlen,
> - q->limits.discard_granularity);
> + bdev_discard_granularity(sb->s_bdev));
>
> ret = jfs_ioc_trim(inode, &range);
> if (ret < 0)
> diff --git a/fs/nilfs2/ioctl.c b/fs/nilfs2/ioctl.c
> index 52b73f558fcb1..87e1004b606d2 100644
> --- a/fs/nilfs2/ioctl.c
> +++ b/fs/nilfs2/ioctl.c
> @@ -1052,7 +1052,6 @@ static int nilfs_ioctl_resize(struct inode *inode, struct file *filp,
> static int nilfs_ioctl_trim_fs(struct inode *inode, void __user *argp)
> {
> struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
> - struct request_queue *q = bdev_get_queue(nilfs->ns_bdev);
> struct fstrim_range range;
> int ret;
>
> @@ -1065,7 +1064,8 @@ static int nilfs_ioctl_trim_fs(struct inode *inode, void __user *argp)
> if (copy_from_user(&range, argp, sizeof(range)))
> return -EFAULT;
>
> - range.minlen = max_t(u64, range.minlen, q->limits.discard_granularity);
> + range.minlen = max_t(u64, range.minlen,
> + bdev_discard_granularity(nilfs->ns_bdev));
>
> down_read(&nilfs->ns_segctor_sem);
> ret = nilfs_sufile_trim_fs(nilfs->ns_sufile, &range);
> diff --git a/fs/ntfs3/file.c b/fs/ntfs3/file.c
> index e763236169331..15806eeae217a 100644
> --- a/fs/ntfs3/file.c
> +++ b/fs/ntfs3/file.c
> @@ -22,7 +22,6 @@ static int ntfs_ioctl_fitrim(struct ntfs_sb_info *sbi, unsigned long arg)
> {
> struct fstrim_range __user *user_range;
> struct fstrim_range range;
> - struct request_queue *q = bdev_get_queue(sbi->sb->s_bdev);
> int err;
>
> if (!capable(CAP_SYS_ADMIN))
> @@ -35,7 +34,8 @@ static int ntfs_ioctl_fitrim(struct ntfs_sb_info *sbi, unsigned long arg)
> if (copy_from_user(&range, user_range, sizeof(range)))
> return -EFAULT;
>
> - range.minlen = max_t(u32, range.minlen, q->limits.discard_granularity);
> + range.minlen = max_t(u32, range.minlen,
> + bdev_discard_granularity(sbi->sb->s_bdev));
>
> err = ntfs_trim_fs(sbi, &range);
> if (err < 0)
> diff --git a/fs/ntfs3/super.c b/fs/ntfs3/super.c
> index c734085bcce4a..5f2e414cfa79b 100644
> --- a/fs/ntfs3/super.c
> +++ b/fs/ntfs3/super.c
> @@ -882,7 +882,6 @@ static int ntfs_fill_super(struct super_block *sb, struct fs_context *fc)
> int err;
> struct ntfs_sb_info *sbi = sb->s_fs_info;
> struct block_device *bdev = sb->s_bdev;
> - struct request_queue *rq;
> struct inode *inode;
> struct ntfs_inode *ni;
> size_t i, tt;
> @@ -912,9 +911,8 @@ static int ntfs_fill_super(struct super_block *sb, struct fs_context *fc)
> goto out;
> }
>
> - rq = bdev_get_queue(bdev);
> - if (bdev_max_discard_sectors(bdev) && rq->limits.discard_granularity) {
> - sbi->discard_granularity = rq->limits.discard_granularity;
> + if (bdev_max_discard_sectors(bdev) && bdev_discard_granularity(bdev)) {
> + sbi->discard_granularity = bdev_discard_granularity(bdev);
> sbi->discard_granularity_mask_inv =
> ~(u64)(sbi->discard_granularity - 1);
> }
> diff --git a/fs/ocfs2/ioctl.c b/fs/ocfs2/ioctl.c
> index 9b78ef103ada6..afd54ec661030 100644
> --- a/fs/ocfs2/ioctl.c
> +++ b/fs/ocfs2/ioctl.c
> @@ -903,7 +903,6 @@ long ocfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
> case FITRIM:
> {
> struct super_block *sb = inode->i_sb;
> - struct request_queue *q = bdev_get_queue(sb->s_bdev);
> struct fstrim_range range;
> int ret = 0;
>
> @@ -916,7 +915,7 @@ long ocfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
> if (copy_from_user(&range, argp, sizeof(range)))
> return -EFAULT;
>
> - range.minlen = max_t(u64, q->limits.discard_granularity,
> + range.minlen = max_t(u64, bdev_discard_granularity(sb->s_bdev),
> range.minlen);
> ret = ocfs2_trim_fs(sb, &range);
> if (ret < 0)
> diff --git a/fs/xfs/xfs_discard.c b/fs/xfs/xfs_discard.c
> index a4e6609d616b7..e2ada115c23f9 100644
> --- a/fs/xfs/xfs_discard.c
> +++ b/fs/xfs/xfs_discard.c
> @@ -152,8 +152,8 @@ xfs_ioc_trim(
> struct xfs_mount *mp,
> struct fstrim_range __user *urange)
> {
> - struct request_queue *q = bdev_get_queue(mp->m_ddev_targp->bt_bdev);
> - unsigned int granularity = q->limits.discard_granularity;
> + unsigned int granularity =
> + bdev_discard_granularity(mp->m_ddev_targp->bt_bdev);
> struct fstrim_range range;
> xfs_daddr_t start, end, minlen;
> xfs_agnumber_t start_agno, end_agno, agno;
> diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
> index ce16247d3afab..7b9c0cf95d2d5 100644
> --- a/include/linux/blkdev.h
> +++ b/include/linux/blkdev.h
> @@ -1259,6 +1259,11 @@ static inline unsigned int bdev_max_discard_sectors(struct block_device *bdev)
> return bdev_get_queue(bdev)->limits.max_discard_sectors;
> }
>
> +static inline unsigned int bdev_discard_granularity(struct block_device *bdev)
> +{
> + return bdev_get_queue(bdev)->limits.discard_granularity;
> +}
> +
> static inline unsigned int bdev_write_zeroes_sectors(struct block_device *bdev)
> {
> struct request_queue *q = bdev_get_queue(bdev);
> --
> 2.30.2
>

I got the following checkpatch warning:

WARNING: 'retreive' may be misspelled - perhaps 'retrieve'?
#101:
block_device based helper to retreive the discard granularity.
^^^^^^^^

total: 0 errors, 1 warnings, 294 lines checked

The changes themselves look good.

Acked-by: Ryusuke Konishi <konishi.ryusuke@gmail.com>

Thanks,
Ryusuke Konishi