diff options
| -rw-r--r-- | block/bdev.c | 78 | ||||
| -rw-r--r-- | drivers/block/brd.c | 15 | ||||
| -rw-r--r-- | drivers/block/zram/zram_drv.c | 61 | ||||
| -rw-r--r-- | drivers/nvdimm/btt.c | 16 | ||||
| -rw-r--r-- | drivers/nvdimm/pmem.c | 24 | ||||
| -rw-r--r-- | include/linux/blkdev.h | 12 | ||||
| -rw-r--r-- | mm/page_io.c | 53 | ||||
| -rw-r--r-- | mm/swapfile.c | 2 |
8 files changed, 44 insertions, 217 deletions
diff --git a/block/bdev.c b/block/bdev.c index edc110d90df4..1795c7d4b99e 100644 --- a/block/bdev.c +++ b/block/bdev.c @@ -304,84 +304,6 @@ out: } EXPORT_SYMBOL(thaw_bdev); -/** - * bdev_read_page() - Start reading a page from a block device - * @bdev: The device to read the page from - * @sector: The offset on the device to read the page to (need not be aligned) - * @page: The page to read - * - * On entry, the page should be locked. It will be unlocked when the page - * has been read. If the block driver implements rw_page synchronously, - * that will be true on exit from this function, but it need not be. - * - * Errors returned by this function are usually "soft", eg out of memory, or - * queue full; callers should try a different route to read this page rather - * than propagate an error back up the stack. - * - * Return: negative errno if an error occurs, 0 if submission was successful. - */ -int bdev_read_page(struct block_device *bdev, sector_t sector, - struct page *page) -{ - const struct block_device_operations *ops = bdev->bd_disk->fops; - int result = -EOPNOTSUPP; - - if (!ops->rw_page || bdev_get_integrity(bdev)) - return result; - - result = blk_queue_enter(bdev_get_queue(bdev), 0); - if (result) - return result; - result = ops->rw_page(bdev, sector + get_start_sect(bdev), page, - REQ_OP_READ); - blk_queue_exit(bdev_get_queue(bdev)); - return result; -} - -/** - * bdev_write_page() - Start writing a page to a block device - * @bdev: The device to write the page to - * @sector: The offset on the device to write the page to (need not be aligned) - * @page: The page to write - * @wbc: The writeback_control for the write - * - * On entry, the page should be locked and not currently under writeback. - * On exit, if the write started successfully, the page will be unlocked and - * under writeback. If the write failed already (eg the driver failed to - * queue the page to the device), the page will still be locked. If the - * caller is a ->writepage implementation, it will need to unlock the page. - * - * Errors returned by this function are usually "soft", eg out of memory, or - * queue full; callers should try a different route to write this page rather - * than propagate an error back up the stack. - * - * Return: negative errno if an error occurs, 0 if submission was successful. - */ -int bdev_write_page(struct block_device *bdev, sector_t sector, - struct page *page, struct writeback_control *wbc) -{ - int result; - const struct block_device_operations *ops = bdev->bd_disk->fops; - - if (!ops->rw_page || bdev_get_integrity(bdev)) - return -EOPNOTSUPP; - result = blk_queue_enter(bdev_get_queue(bdev), 0); - if (result) - return result; - - set_page_writeback(page); - result = ops->rw_page(bdev, sector + get_start_sect(bdev), page, - REQ_OP_WRITE); - if (result) { - end_page_writeback(page); - } else { - clean_page_buffers(page); - unlock_page(page); - } - blk_queue_exit(bdev_get_queue(bdev)); - return result; -} - /* * pseudo-fs */ diff --git a/drivers/block/brd.c b/drivers/block/brd.c index 20acc4a1fd6d..37dce184eb56 100644 --- a/drivers/block/brd.c +++ b/drivers/block/brd.c @@ -309,23 +309,9 @@ static void brd_submit_bio(struct bio *bio) bio_endio(bio); } -static int brd_rw_page(struct block_device *bdev, sector_t sector, - struct page *page, enum req_op op) -{ - struct brd_device *brd = bdev->bd_disk->private_data; - int err; - - if (PageTransHuge(page)) - return -ENOTSUPP; - err = brd_do_bvec(brd, page, PAGE_SIZE, 0, op, sector); - page_endio(page, op_is_write(op), err); - return err; -} - static const struct block_device_operations brd_fops = { .owner = THIS_MODULE, .submit_bio = brd_submit_bio, - .rw_page = brd_rw_page, }; /* @@ -411,6 +397,7 @@ static int brd_alloc(int i) /* Tell the block layer that this is not a rotational device */ blk_queue_flag_set(QUEUE_FLAG_NONROT, disk->queue); + blk_queue_flag_set(QUEUE_FLAG_SYNCHRONOUS, disk->queue); blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, disk->queue); err = add_disk(disk); if (err) diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c index 5d1088a645e3..25526707f607 100644 --- a/drivers/block/zram/zram_drv.c +++ b/drivers/block/zram/zram_drv.c @@ -1453,10 +1453,6 @@ static int __zram_bvec_read(struct zram *zram, struct page *page, u32 index, /* Slot should be unlocked before the function call */ zram_slot_unlock(zram, index); - /* A null bio means rw_page was used, we must fallback to bio */ - if (!bio) - return -EOPNOTSUPP; - ret = zram_bvec_read_from_bdev(zram, page, index, bio, partial_io); } @@ -2081,61 +2077,6 @@ static void zram_slot_free_notify(struct block_device *bdev, zram_slot_unlock(zram, index); } -static int zram_rw_page(struct block_device *bdev, sector_t sector, - struct page *page, enum req_op op) -{ - int offset, ret; - u32 index; - struct zram *zram; - struct bio_vec bv; - unsigned long start_time; - - if (PageTransHuge(page)) - return -ENOTSUPP; - zram = bdev->bd_disk->private_data; - - if (!valid_io_request(zram, sector, PAGE_SIZE)) { - atomic64_inc(&zram->stats.invalid_io); - ret = -EINVAL; - goto out; - } - - index = sector >> SECTORS_PER_PAGE_SHIFT; - offset = (sector & (SECTORS_PER_PAGE - 1)) << SECTOR_SHIFT; - - bv.bv_page = page; - bv.bv_len = PAGE_SIZE; - bv.bv_offset = 0; - - start_time = bdev_start_io_acct(bdev->bd_disk->part0, - SECTORS_PER_PAGE, op, jiffies); - ret = zram_bvec_rw(zram, &bv, index, offset, op, NULL); - bdev_end_io_acct(bdev->bd_disk->part0, op, start_time); -out: - /* - * If I/O fails, just return error(ie, non-zero) without - * calling page_endio. - * It causes resubmit the I/O with bio request by upper functions - * of rw_page(e.g., swap_readpage, __swap_writepage) and - * bio->bi_end_io does things to handle the error - * (e.g., SetPageError, set_page_dirty and extra works). - */ - if (unlikely(ret < 0)) - return ret; - - switch (ret) { - case 0: - page_endio(page, op_is_write(op), 0); - break; - case 1: - ret = 0; - break; - default: - WARN_ON(1); - } - return ret; -} - static void zram_destroy_comps(struct zram *zram) { u32 prio; @@ -2290,7 +2231,6 @@ static const struct block_device_operations zram_devops = { .open = zram_open, .submit_bio = zram_submit_bio, .swap_slot_free_notify = zram_slot_free_notify, - .rw_page = zram_rw_page, .owner = THIS_MODULE }; @@ -2389,6 +2329,7 @@ static int zram_add(void) set_capacity(zram->disk, 0); /* zram devices sort of resembles non-rotational disks */ blk_queue_flag_set(QUEUE_FLAG_NONROT, zram->disk->queue); + blk_queue_flag_set(QUEUE_FLAG_SYNCHRONOUS, zram->disk->queue); blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, zram->disk->queue); /* diff --git a/drivers/nvdimm/btt.c b/drivers/nvdimm/btt.c index 0297b7882e33..d5593b0dc700 100644 --- a/drivers/nvdimm/btt.c +++ b/drivers/nvdimm/btt.c @@ -1482,20 +1482,6 @@ static void btt_submit_bio(struct bio *bio) bio_endio(bio); } -static int btt_rw_page(struct block_device *bdev, sector_t sector, - struct page *page, enum req_op op) -{ - struct btt *btt = bdev->bd_disk->private_data; - int rc; - - rc = btt_do_bvec(btt, NULL, page, thp_size(page), 0, op, sector); - if (rc == 0) - page_endio(page, op_is_write(op), 0); - - return rc; -} - - static int btt_getgeo(struct block_device *bd, struct hd_geometry *geo) { /* some standard values */ @@ -1508,7 +1494,6 @@ static int btt_getgeo(struct block_device *bd, struct hd_geometry *geo) static const struct block_device_operations btt_fops = { .owner = THIS_MODULE, .submit_bio = btt_submit_bio, - .rw_page = btt_rw_page, .getgeo = btt_getgeo, }; @@ -1530,6 +1515,7 @@ static int btt_blk_init(struct btt *btt) blk_queue_logical_block_size(btt->btt_disk->queue, btt->sector_size); blk_queue_max_hw_sectors(btt->btt_disk->queue, UINT_MAX); blk_queue_flag_set(QUEUE_FLAG_NONROT, btt->btt_disk->queue); + blk_queue_flag_set(QUEUE_FLAG_SYNCHRONOUS, btt->btt_disk->queue); if (btt_meta_size(btt)) { rc = nd_integrity_init(btt->btt_disk, btt_meta_size(btt)); diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c index 96e6e9a5f235..ceea55f621cc 100644 --- a/drivers/nvdimm/pmem.c +++ b/drivers/nvdimm/pmem.c @@ -238,28 +238,6 @@ static void pmem_submit_bio(struct bio *bio) bio_endio(bio); } -static int pmem_rw_page(struct block_device *bdev, sector_t sector, - struct page *page, enum req_op op) -{ - struct pmem_device *pmem = bdev->bd_disk->private_data; - blk_status_t rc; - - if (op_is_write(op)) - rc = pmem_do_write(pmem, page, 0, sector, thp_size(page)); - else - rc = pmem_do_read(pmem, page, 0, sector, thp_size(page)); - /* - * The ->rw_page interface is subtle and tricky. The core - * retries on any error, so we can only invoke page_endio() in - * the successful completion case. Otherwise, we'll see crashes - * caused by double completion. - */ - if (rc == 0) - page_endio(page, op_is_write(op), 0); - - return blk_status_to_errno(rc); -} - /* see "strong" declaration in tools/testing/nvdimm/pmem-dax.c */ __weak long __pmem_direct_access(struct pmem_device *pmem, pgoff_t pgoff, long nr_pages, enum dax_access_mode mode, void **kaddr, @@ -310,7 +288,6 @@ __weak long __pmem_direct_access(struct pmem_device *pmem, pgoff_t pgoff, static const struct block_device_operations pmem_fops = { .owner = THIS_MODULE, .submit_bio = pmem_submit_bio, - .rw_page = pmem_rw_page, }; static int pmem_dax_zero_page_range(struct dax_device *dax_dev, pgoff_t pgoff, @@ -565,6 +542,7 @@ static int pmem_attach_disk(struct device *dev, blk_queue_logical_block_size(q, pmem_sector_size(ndns)); blk_queue_max_hw_sectors(q, UINT_MAX); blk_queue_flag_set(QUEUE_FLAG_NONROT, q); + blk_queue_flag_set(QUEUE_FLAG_SYNCHRONOUS, q); if (pmem->pfn_flags & PFN_MAP) blk_queue_flag_set(QUEUE_FLAG_DAX, q); diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 43d4e073b111..c5e59965b145 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -554,6 +554,7 @@ struct request_queue { #define QUEUE_FLAG_IO_STAT 7 /* do disk/partitions IO accounting */ #define QUEUE_FLAG_NOXMERGES 9 /* No extended merges */ #define QUEUE_FLAG_ADD_RANDOM 10 /* Contributes to random pool */ +#define QUEUE_FLAG_SYNCHRONOUS 11 /* always completes in submit context */ #define QUEUE_FLAG_SAME_FORCE 12 /* force complete on same CPU */ #define QUEUE_FLAG_INIT_DONE 14 /* queue is initialized */ #define QUEUE_FLAG_STABLE_WRITES 15 /* don't modify blks until WB is done */ @@ -1250,6 +1251,12 @@ static inline bool bdev_nonrot(struct block_device *bdev) return blk_queue_nonrot(bdev_get_queue(bdev)); } +static inline bool bdev_synchronous(struct block_device *bdev) +{ + return test_bit(QUEUE_FLAG_SYNCHRONOUS, + &bdev_get_queue(bdev)->queue_flags); +} + static inline bool bdev_stable_writes(struct block_device *bdev) { return test_bit(QUEUE_FLAG_STABLE_WRITES, @@ -1382,7 +1389,6 @@ struct block_device_operations { unsigned int flags); int (*open) (struct block_device *, fmode_t); void (*release) (struct gendisk *, fmode_t); - int (*rw_page)(struct block_device *, sector_t, struct page *, enum req_op); int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); unsigned int (*check_events) (struct gendisk *disk, @@ -1417,10 +1423,6 @@ extern int blkdev_compat_ptr_ioctl(struct block_device *, fmode_t, #define blkdev_compat_ptr_ioctl NULL #endif -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 *); - static inline void blk_wake_io_task(struct task_struct *waiter) { /* diff --git a/mm/page_io.c b/mm/page_io.c index 0a1a3b831344..a805117f7fd7 100644 --- a/mm/page_io.c +++ b/mm/page_io.c @@ -27,7 +27,7 @@ #include <linux/delayacct.h> #include "swap.h" -static void end_swap_bio_write(struct bio *bio) +static void __end_swap_bio_write(struct bio *bio) { struct page *page = bio_first_page_all(bio); @@ -48,6 +48,11 @@ static void end_swap_bio_write(struct bio *bio) ClearPageReclaim(page); } end_page_writeback(page); +} + +static void end_swap_bio_write(struct bio *bio) +{ + __end_swap_bio_write(bio); bio_put(bio); } @@ -326,15 +331,31 @@ static void swap_writepage_fs(struct page *page, struct writeback_control *wbc) *wbc->swap_plug = sio; } -static void swap_writepage_bdev(struct page *page, +static void swap_writepage_bdev_sync(struct page *page, struct writeback_control *wbc, struct swap_info_struct *sis) { - struct bio *bio; + struct bio_vec bv; + struct bio bio; - if (!bdev_write_page(sis->bdev, swap_page_sector(page), page, wbc)) { - count_swpout_vm_event(page); - return; - } + bio_init(&bio, sis->bdev, &bv, 1, + REQ_OP_WRITE | REQ_SWAP | wbc_to_write_flags(wbc)); + bio.bi_iter.bi_sector = swap_page_sector(page); + bio_add_page(&bio, page, thp_size(page), 0); + + bio_associate_blkg_from_page(&bio, page); + count_swpout_vm_event(page); + + set_page_writeback(page); + unlock_page(page); + + submit_bio_wait(&bio); + __end_swap_bio_write(&bio); +} + +static void swap_writepage_bdev_async(struct page *page, + struct writeback_control *wbc, struct swap_info_struct *sis) +{ + struct bio *bio; bio = bio_alloc(sis->bdev, 1, REQ_OP_WRITE | REQ_SWAP | wbc_to_write_flags(wbc), @@ -362,8 +383,10 @@ void __swap_writepage(struct page *page, struct writeback_control *wbc) */ if (data_race(sis->flags & SWP_FS_OPS)) swap_writepage_fs(page, wbc); + else if (sis->flags & SWP_SYNCHRONOUS_IO) + swap_writepage_bdev_sync(page, wbc, sis); else - swap_writepage_bdev(page, wbc, sis); + swap_writepage_bdev_async(page, wbc, sis); } void swap_write_unplug(struct swap_iocb *sio) @@ -447,12 +470,6 @@ static void swap_readpage_bdev_sync(struct page *page, struct bio_vec bv; struct bio bio; - if ((sis->flags & SWP_SYNCHRONOUS_IO) && - !bdev_read_page(sis->bdev, swap_page_sector(page), page)) { - count_vm_event(PSWPIN); - return; - } - bio_init(&bio, sis->bdev, &bv, 1, REQ_OP_READ); bio.bi_iter.bi_sector = swap_page_sector(page); bio_add_page(&bio, page, thp_size(page), 0); @@ -472,12 +489,6 @@ static void swap_readpage_bdev_async(struct page *page, { struct bio *bio; - if ((sis->flags & SWP_SYNCHRONOUS_IO) && - !bdev_read_page(sis->bdev, swap_page_sector(page), page)) { - count_vm_event(PSWPIN); - return; - } - bio = bio_alloc(sis->bdev, 1, REQ_OP_READ, GFP_KERNEL); bio->bi_iter.bi_sector = swap_page_sector(page); bio->bi_end_io = end_swap_bio_read; @@ -513,7 +524,7 @@ void swap_readpage(struct page *page, bool synchronous, struct swap_iocb **plug) unlock_page(page); } else if (data_race(sis->flags & SWP_FS_OPS)) { swap_readpage_fs(page, plug); - } else if (synchronous) { + } else if (synchronous || (sis->flags & SWP_SYNCHRONOUS_IO)) { swap_readpage_bdev_sync(page, sis); } else { swap_readpage_bdev_async(page, sis); diff --git a/mm/swapfile.c b/mm/swapfile.c index af151679d13a..888aed774fb6 100644 --- a/mm/swapfile.c +++ b/mm/swapfile.c @@ -3071,7 +3071,7 @@ SYSCALL_DEFINE2(swapon, const char __user *, specialfile, int, swap_flags) if (p->bdev && bdev_stable_writes(p->bdev)) p->flags |= SWP_STABLE_WRITES; - if (p->bdev && p->bdev->bd_disk->fops->rw_page) + if (p->bdev && bdev_synchronous(p->bdev)) p->flags |= SWP_SYNCHRONOUS_IO; if (p->bdev && bdev_nonrot(p->bdev)) { |