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dax: return the partition offset from fs_dax_get_by_bdev

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Prepare for the removal of the block_device from the DAX I/O path by
returning the partition offset from fs_dax_get_by_bdev so that the file
systems have it at hand for use during I/O.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Link: https://lore.kernel.org/r/20211129102203.2243509-26-hch@lst.de
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Christoph Hellwig 2021-11-29 11:21:59 +01:00 committed by Dan Williams
parent 952da06375
commit cd913c76f4
11 changed files with 22 additions and 12 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

9
drivers/dax/super.c
View file

@ -69,17 +69,20 @@ EXPORT_SYMBOL_GPL(dax_remove_host);
/**
* fs_dax_get_by_bdev() - temporary lookup mechanism for filesystem-dax
* @bdev: block device to find a dax_device for
* @start_off: returns the byte offset into the dax_device that @bdev starts
*/
struct dax_device *fs_dax_get_by_bdev(struct block_device *bdev)
struct dax_device *fs_dax_get_by_bdev(struct block_device *bdev, u64 *start_off)
{
struct dax_device *dax_dev;
u64 part_size;
int id;
if (!blk_queue_dax(bdev->bd_disk->queue))
return NULL;
if ((get_start_sect(bdev) * SECTOR_SIZE) % PAGE_SIZE ||
(bdev_nr_sectors(bdev) * SECTOR_SIZE) % PAGE_SIZE) {
*start_off = get_start_sect(bdev) * SECTOR_SIZE;
part_size = bdev_nr_sectors(bdev) * SECTOR_SIZE;
if (*start_off % PAGE_SIZE || part_size % PAGE_SIZE) {
pr_info("%pg: error: unaligned partition for dax\n", bdev);
return NULL;
}

4
drivers/md/dm.c
View file

@ -637,7 +637,7 @@ static int open_table_device(struct table_device *td, dev_t dev,
struct mapped_device *md)
{
struct block_device *bdev;
u64 part_off;
int r;
BUG_ON(td->dm_dev.bdev);
@ -653,7 +653,7 @@ static int open_table_device(struct table_device *td, dev_t dev,
}
td->dm_dev.bdev = bdev;
td->dm_dev.dax_dev = fs_dax_get_by_bdev(bdev);
td->dm_dev.dax_dev = fs_dax_get_by_bdev(bdev, &part_off);
return 0;
}

2
fs/erofs/internal.h
View file

@ -51,6 +51,7 @@ struct erofs_device_info {
char *path;
struct block_device *bdev;
struct dax_device *dax_dev;
u64 dax_part_off;
u32 blocks;
u32 mapped_blkaddr;
@ -109,6 +110,7 @@ struct erofs_sb_info {
#endif /* CONFIG_EROFS_FS_ZIP */
struct erofs_dev_context *devs;
struct dax_device *dax_dev;
u64 dax_part_off;
u64 total_blocks;
u32 primarydevice_blocks;

4
fs/erofs/super.c
View file

@ -312,7 +312,7 @@ static int erofs_init_devices(struct super_block *sb,
goto err_out;
}
dif->bdev = bdev;
dif->dax_dev = fs_dax_get_by_bdev(bdev);
dif->dax_dev = fs_dax_get_by_bdev(bdev, &dif->dax_part_off);
dif->blocks = le32_to_cpu(dis->blocks);
dif->mapped_blkaddr = le32_to_cpu(dis->mapped_blkaddr);
sbi->total_blocks += dif->blocks;
@ -644,7 +644,7 @@ static int erofs_fc_fill_super(struct super_block *sb, struct fs_context *fc)
sb->s_fs_info = sbi;
sbi->opt = ctx->opt;
sbi->dax_dev = fs_dax_get_by_bdev(sb->s_bdev);
sbi->dax_dev = fs_dax_get_by_bdev(sb->s_bdev, &sbi->dax_part_off);
sbi->devs = ctx->devs;
ctx->devs = NULL;

1
fs/ext2/ext2.h
View file

@ -118,6 +118,7 @@ struct ext2_sb_info {
spinlock_t s_lock;
struct mb_cache *s_ea_block_cache;
struct dax_device *s_daxdev;
u64 s_dax_part_off;
};
static inline spinlock_t *

2
fs/ext2/super.c
View file

@ -831,7 +831,7 @@ static int ext2_fill_super(struct super_block *sb, void *data, int silent)
}
sb->s_fs_info = sbi;
sbi->s_sb_block = sb_block;
sbi->s_daxdev = fs_dax_get_by_bdev(sb->s_bdev);
sbi->s_daxdev = fs_dax_get_by_bdev(sb->s_bdev, &sbi->s_dax_part_off);
spin_lock_init(&sbi->s_lock);
ret = -EINVAL;

1
fs/ext4/ext4.h
View file

@ -1697,6 +1697,7 @@ struct ext4_sb_info {
*/
struct percpu_rw_semaphore s_writepages_rwsem;
struct dax_device *s_daxdev;
u64 s_dax_part_off;
#ifdef CONFIG_EXT4_DEBUG
unsigned long s_simulate_fail;
#endif

2
fs/ext4/super.c
View file

@ -3913,7 +3913,7 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
if (!sbi->s_blockgroup_lock)
goto out_free_base;
sbi->s_daxdev = fs_dax_get_by_bdev(sb->s_bdev);
sbi->s_daxdev = fs_dax_get_by_bdev(sb->s_bdev, &sbi->s_dax_part_off);
sb->s_fs_info = sbi;
sbi->s_sb = sb;
sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;

2
fs/xfs/xfs_buf.c
View file

@ -1945,7 +1945,7 @@ xfs_alloc_buftarg(
btp->bt_mount = mp;
btp->bt_dev = bdev->bd_dev;
btp->bt_bdev = bdev;
btp->bt_daxdev = fs_dax_get_by_bdev(bdev);
btp->bt_daxdev = fs_dax_get_by_bdev(bdev, &btp->bt_dax_part_off);
/*
* Buffer IO error rate limiting. Limit it to no more than 10 messages

1
fs/xfs/xfs_buf.h
View file

@ -89,6 +89,7 @@ typedef struct xfs_buftarg {
dev_t bt_dev;
struct block_device *bt_bdev;
struct dax_device *bt_daxdev;
u64 bt_dax_part_off;
struct xfs_mount *bt_mount;
unsigned int bt_meta_sectorsize;
size_t bt_meta_sectormask;

6
include/linux/dax.h
View file

@ -117,7 +117,8 @@ static inline void fs_put_dax(struct dax_device *dax_dev)
put_dax(dax_dev);
}
struct dax_device *fs_dax_get_by_bdev(struct block_device *bdev);
struct dax_device *fs_dax_get_by_bdev(struct block_device *bdev,
u64 *start_off);
int dax_writeback_mapping_range(struct address_space *mapping,
struct dax_device *dax_dev, struct writeback_control *wbc);
@ -138,7 +139,8 @@ static inline void fs_put_dax(struct dax_device *dax_dev)
{
}
static inline struct dax_device *fs_dax_get_by_bdev(struct block_device *bdev)
static inline struct dax_device *fs_dax_get_by_bdev(struct block_device *bdev,
u64 *start_off)
{
return NULL;
}