[PATCH v2 17/33] block: remove block_device_operations ->direct_access()
From: Dan Williams
Date: Fri Apr 14 2017 - 22:43:45 EST
Now that all the producers and consumers of dax interfaces have been
converted to using dax_operations on a dax_device, remove the block
device direct_access enabling.
Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx>
---
arch/powerpc/sysdev/axonram.c | 23 ++++-----------------
drivers/block/brd.c | 15 --------------
drivers/md/dm.c | 13 ------------
drivers/nvdimm/pmem.c | 10 ---------
drivers/s390/block/dcssblk.c | 16 ---------------
fs/block_dev.c | 45 -----------------------------------------
include/linux/blkdev.h | 17 ---------------
7 files changed, 4 insertions(+), 135 deletions(-)
diff --git a/arch/powerpc/sysdev/axonram.c b/arch/powerpc/sysdev/axonram.c
index ad857d5e81b1..83eb56ff1d2c 100644
--- a/arch/powerpc/sysdev/axonram.c
+++ b/arch/powerpc/sysdev/axonram.c
@@ -139,6 +139,10 @@ axon_ram_make_request(struct request_queue *queue, struct bio *bio)
return BLK_QC_T_NONE;
}
+static const struct block_device_operations axon_ram_devops = {
+ .owner = THIS_MODULE,
+};
+
static long
__axon_ram_direct_access(struct axon_ram_bank *bank, pgoff_t pgoff, long nr_pages,
void **kaddr, pfn_t *pfn)
@@ -150,25 +154,6 @@ __axon_ram_direct_access(struct axon_ram_bank *bank, pgoff_t pgoff, long nr_page
return (bank->size - offset) / PAGE_SIZE;
}
-/**
- * axon_ram_direct_access - direct_access() method for block device
- * @device, @sector, @data: see block_device_operations method
- */
-static long
-axon_ram_blk_direct_access(struct block_device *device, sector_t sector,
- void **kaddr, pfn_t *pfn, long size)
-{
- struct axon_ram_bank *bank = device->bd_disk->private_data;
-
- return __axon_ram_direct_access(bank, (sector * 512) / PAGE_SIZE,
- size / PAGE_SIZE, kaddr, pfn) * PAGE_SIZE;
-}
-
-static const struct block_device_operations axon_ram_devops = {
- .owner = THIS_MODULE,
- .direct_access = axon_ram_blk_direct_access
-};
-
static long
axon_ram_dax_direct_access(struct dax_device *dax_dev, pgoff_t pgoff, long nr_pages,
void **kaddr, pfn_t *pfn)
diff --git a/drivers/block/brd.c b/drivers/block/brd.c
index 60f3193c9ce2..bfa4ed2c75ef 100644
--- a/drivers/block/brd.c
+++ b/drivers/block/brd.c
@@ -395,18 +395,6 @@ static long __brd_direct_access(struct brd_device *brd, pgoff_t pgoff,
return 1;
}
-static long brd_blk_direct_access(struct block_device *bdev, sector_t sector,
- void **kaddr, pfn_t *pfn, long size)
-{
- struct brd_device *brd = bdev->bd_disk->private_data;
- long nr_pages = __brd_direct_access(brd, PHYS_PFN(sector * 512),
- PHYS_PFN(size), kaddr, pfn);
-
- if (nr_pages < 0)
- return nr_pages;
- return nr_pages * PAGE_SIZE;
-}
-
static long brd_dax_direct_access(struct dax_device *dax_dev,
pgoff_t pgoff, long nr_pages, void **kaddr, pfn_t *pfn)
{
@@ -418,14 +406,11 @@ static long brd_dax_direct_access(struct dax_device *dax_dev,
static const struct dax_operations brd_dax_ops = {
.direct_access = brd_dax_direct_access,
};
-#else
-#define brd_blk_direct_access NULL
#endif
static const struct block_device_operations brd_fops = {
.owner = THIS_MODULE,
.rw_page = brd_rw_page,
- .direct_access = brd_blk_direct_access,
};
/*
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index ef4c6f8cad47..79d5f5fd823e 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -957,18 +957,6 @@ static long dm_dax_direct_access(struct dax_device *dax_dev, pgoff_t pgoff,
return ret;
}
-static long dm_blk_direct_access(struct block_device *bdev, sector_t sector,
- void **kaddr, pfn_t *pfn, long size)
-{
- struct mapped_device *md = bdev->bd_disk->private_data;
- struct dax_device *dax_dev = md->dax_dev;
- long nr_pages = size / PAGE_SIZE;
-
- nr_pages = dm_dax_direct_access(dax_dev, sector / PAGE_SECTORS,
- nr_pages, kaddr, pfn);
- return nr_pages < 0 ? nr_pages : nr_pages * PAGE_SIZE;
-}
-
/*
* A target may call dm_accept_partial_bio only from the map routine. It is
* allowed for all bio types except REQ_PREFLUSH.
@@ -2823,7 +2811,6 @@ static const struct block_device_operations dm_blk_dops = {
.open = dm_blk_open,
.release = dm_blk_close,
.ioctl = dm_blk_ioctl,
- .direct_access = dm_blk_direct_access,
.getgeo = dm_blk_getgeo,
.pr_ops = &dm_pr_ops,
.owner = THIS_MODULE
diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c
index fbbcf8154eec..85b85633d674 100644
--- a/drivers/nvdimm/pmem.c
+++ b/drivers/nvdimm/pmem.c
@@ -220,19 +220,9 @@ __weak long __pmem_direct_access(struct pmem_device *pmem, pgoff_t pgoff,
return PHYS_PFN(pmem->size - pmem->pfn_pad - offset);
}
-static long pmem_blk_direct_access(struct block_device *bdev, sector_t sector,
- void **kaddr, pfn_t *pfn, long size)
-{
- struct pmem_device *pmem = bdev->bd_queue->queuedata;
-
- return __pmem_direct_access(pmem, PHYS_PFN(sector * 512),
- PHYS_PFN(size), kaddr, pfn);
-}
-
static const struct block_device_operations pmem_fops = {
.owner = THIS_MODULE,
.rw_page = pmem_rw_page,
- .direct_access = pmem_blk_direct_access,
.revalidate_disk = nvdimm_revalidate_disk,
};
diff --git a/drivers/s390/block/dcssblk.c b/drivers/s390/block/dcssblk.c
index 682a9eb4934d..1586e11b979e 100644
--- a/drivers/s390/block/dcssblk.c
+++ b/drivers/s390/block/dcssblk.c
@@ -31,8 +31,6 @@ static int dcssblk_open(struct block_device *bdev, fmode_t mode);
static void dcssblk_release(struct gendisk *disk, fmode_t mode);
static blk_qc_t dcssblk_make_request(struct request_queue *q,
struct bio *bio);
-static long dcssblk_blk_direct_access(struct block_device *bdev, sector_t secnum,
- void **kaddr, pfn_t *pfn, long size);
static long dcssblk_dax_direct_access(struct dax_device *dax_dev, pgoff_t pgoff,
long nr_pages, void **kaddr, pfn_t *pfn);
@@ -43,7 +41,6 @@ static const struct block_device_operations dcssblk_devops = {
.owner = THIS_MODULE,
.open = dcssblk_open,
.release = dcssblk_release,
- .direct_access = dcssblk_blk_direct_access,
};
static const struct dax_operations dcssblk_dax_ops = {
@@ -915,19 +912,6 @@ __dcssblk_direct_access(struct dcssblk_dev_info *dev_info, pgoff_t pgoff,
}
static long
-dcssblk_blk_direct_access(struct block_device *bdev, sector_t secnum,
- void **kaddr, pfn_t *pfn, long size)
-{
- struct dcssblk_dev_info *dev_info;
-
- dev_info = bdev->bd_disk->private_data;
- if (!dev_info)
- return -ENODEV;
- return __dcssblk_direct_access(dev_info, PHYS_PFN(secnum * 512),
- PHYS_PFN(size), kaddr, pfn) * PAGE_SIZE;
-}
-
-static long
dcssblk_dax_direct_access(struct dax_device *dax_dev, pgoff_t pgoff,
long nr_pages, void **kaddr, pfn_t *pfn)
{
diff --git a/fs/block_dev.c b/fs/block_dev.c
index ecbdc8f9f718..10e21465d5a9 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -718,51 +718,6 @@ int bdev_write_page(struct block_device *bdev, sector_t sector,
}
EXPORT_SYMBOL_GPL(bdev_write_page);
-/**
- * bdev_direct_access() - Get the address for directly-accessibly memory
- * @bdev: The device containing the memory
- * @dax: control and output parameters for ->direct_access
- *
- * If a block device is made up of directly addressable memory, this function
- * will tell the caller the PFN and the address of the memory. The address
- * may be directly dereferenced within the kernel without the need to call
- * ioremap(), kmap() or similar. The PFN is suitable for inserting into
- * page tables.
- *
- * Return: negative errno if an error occurs, otherwise the number of bytes
- * accessible at this address.
- */
-long bdev_direct_access(struct block_device *bdev, struct blk_dax_ctl *dax)
-{
- sector_t sector = dax->sector;
- long avail, size = dax->size;
- const struct block_device_operations *ops = bdev->bd_disk->fops;
-
- /*
- * The device driver is allowed to sleep, in order to make the
- * memory directly accessible.
- */
- might_sleep();
-
- if (size < 0)
- return size;
- if (!blk_queue_dax(bdev_get_queue(bdev)) || !ops->direct_access)
- return -EOPNOTSUPP;
- if ((sector + DIV_ROUND_UP(size, 512)) >
- part_nr_sects_read(bdev->bd_part))
- return -ERANGE;
- sector += get_start_sect(bdev);
- if (sector % (PAGE_SIZE / 512))
- return -EINVAL;
- avail = ops->direct_access(bdev, sector, &dax->addr, &dax->pfn, size);
- if (!avail)
- return -ERANGE;
- if (avail > 0 && avail & ~PAGE_MASK)
- return -ENXIO;
- return min(avail, size);
-}
-EXPORT_SYMBOL_GPL(bdev_direct_access);
-
int bdev_dax_pgoff(struct block_device *bdev, sector_t sector, size_t size,
pgoff_t *pgoff)
{
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 612c497d1461..848f87eb1905 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -1916,28 +1916,12 @@ static inline bool integrity_req_gap_front_merge(struct request *req,
#endif /* CONFIG_BLK_DEV_INTEGRITY */
-/**
- * struct blk_dax_ctl - control and output parameters for ->direct_access
- * @sector: (input) offset relative to a block_device
- * @addr: (output) kernel virtual address for @sector populated by driver
- * @pfn: (output) page frame number for @addr populated by driver
- * @size: (input) number of bytes requested
- */
-struct blk_dax_ctl {
- sector_t sector;
- void *addr;
- long size;
- pfn_t pfn;
-};
-
struct block_device_operations {
int (*open) (struct block_device *, fmode_t);
void (*release) (struct gendisk *, fmode_t);
int (*rw_page)(struct block_device *, sector_t, struct page *, bool);
int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long);
int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long);
- long (*direct_access)(struct block_device *, sector_t, void **, pfn_t *,
- long);
unsigned int (*check_events) (struct gendisk *disk,
unsigned int clearing);
/* ->media_changed() is DEPRECATED, use ->check_events() instead */
@@ -1956,7 +1940,6 @@ extern int __blkdev_driver_ioctl(struct block_device *, fmode_t, unsigned int,
extern int bdev_read_page(struct block_device *, sector_t, struct page *);
extern int bdev_write_page(struct block_device *, sector_t, struct page *,
struct writeback_control *);
-extern long bdev_direct_access(struct block_device *, struct blk_dax_ctl *);
extern int bdev_dax_supported(struct super_block *, int);
int bdev_dax_pgoff(struct block_device *, sector_t, size_t, pgoff_t *pgoff);
#else /* CONFIG_BLOCK */