[ 2133.109595] dump_stack+0x6d/0x8b
[ 2133.109596] _rw_page+0xaf/0xbe [blk]
[ 2133.109597] mem_blk_submit_bio.cold+0xc2/0x16d [blk]
[ 2133.109598] generic_make_request+0xcf/0x320
[ 2133.109599] submit_bio+0x48/0x1d0
[ 2133.109600] ? bio_add_page+0x6a/0x90
[ 2133.109600] submit_bh_wbc+0x182/0x1b0
[ 2133.109601] __block_write_full_page+0x210/0x440
[ 2133.109602] ? touch_buffer+0x70/0x70
[ 2133.109603] block_write_full_page+0xb0/0x110
[ 2133.109604] blkdev_writepage+0x18/0x20
[ 2133.109605] __writepage+0x1d/0x50
[ 2133.109606] write_cache_pages+0x1ae/0x4b0
[ 2133.109607] ? __wb_calc_thresh+0x130/0x130
[ 2133.109608] ? block_write_end+0x38/0x90
[ 2133.109609] ? block_write_begin+0x4d/0xf0
[ 2133.109610] ? balance_dirty_pages_ratelimited+0x259/0x390
[ 2133.109611] ? generic_perform_write+0x13b/0x1c0
[ 2133.109612] generic_writepages+0x57/0x90
[ 2133.109613] blkdev_writepages+0xe/0x10
[ 2133.109614] do_writepages+0x43/0xd0
[ 2133.109615] ? blkdev_write_iter+0xcd/0x160
[ 2133.109616] __filemap_fdatawrite_range+0xd5/0x110
[ 2133.109617] file_write_and_wait_range+0x74/0xc0
[ 2133.109618] blkdev_fsync+0x1b/0x50
[ 2133.109619] vfs_fsync_range+0x49/0x80
[ 2133.109619] do_fsync+0x3d/0x70
[ 2133.109620] __x64_sys_fsync+0x14/0x20
[ 2133.109621] do_syscall_64+0x57/0x190
[ 2133.109622] entry_SYSCALL_64_after_hwframe+0x5c/0xc1
[ 2133.109623] RIP: 0033:0x7f68ba6bd1a7
[ 2133.109623] Code: 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 b8 4a 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 41 c3 48 83 ec 18 89 7c 24 0c e8 23 f4 f7 ff
[ 2133.109624] RSP: 002b:00007ffe75697478 EFLAGS: 00000246 ORIG_RAX: 000000000000004a
[ 2133.109624] RAX: ffffffffffffffda RBX: 000055a9657ad5b0 RCX: 00007f68ba6bd1a7
[ 2133.109625] RDX: 0000000000000000 RSI: 000055a9657ad5b0 RDI: 0000000000000003
[ 2133.109625] RBP: 0000000000000000 R08: 0000000000000000 R09: 00007f68ba7952f0
[ 2133.109625] R10: 000055a9657a7010 R11: 0000000000000246 R12: 0000000000000000
[ 2133.109626] R13: 0000000000000000 R14: 00007ffe756974f8 R15: 000055a9657ac770
[ 282.777255] CPU: 0 PID: 2801 Comm: mount Tainted: G OE 5.4.233-20230608 #11
[ 282.777257] Hardware name: VMware, Inc. VMware20,1/440BX Desktop Reference Platform, BIOS VMW201.00V.20648489.B64.2210180829 10/18/2022
[ 282.777258] Call Trace:
[ 282.777262] dump_stack+0x6d/0x8b
[ 282.777265] spu_mem_blk_rw_page+0x48/0x5f [spu_blk]
[ 282.777269] bdev_read_page+0x79/0xa0
[ 282.777272] do_mpage_readpage+0x626/0x810
[ 282.777277] ? lru_cache_add+0xe/0x10
[ 282.777280] mpage_readpages+0xe4/0x1a0
[ 282.777284] ? blkdev_direct_IO+0x4b0/0x4b0
[ 282.777288] blkdev_readpages+0x1d/0x20
[ 282.777290] read_pages+0x71/0x1a0
[ 282.777293] __do_page_cache_readahead+0x12f/0x1a0
[ 282.777295] force_page_cache_readahead+0x98/0x110
[ 282.777297] page_cache_sync_readahead+0xaf/0xc0
[ 282.777300] generic_file_read_iter+0x942/0xda0
[ 282.777302] ? lru_cache_add_active_or_unevictable+0x3a/0xb0
[ 282.777304] blkdev_read_iter+0x4a/0x60
[ 282.777307] new_sync_read+0x122/0x1b0
[ 282.777310] __vfs_read+0x29/0x40
[ 282.777312] vfs_read+0xab/0x160
[ 282.777314] ksys_read+0x67/0xe0
[ 282.777317] __x64_sys_read+0x1a/0x20
[ 282.777320] do_syscall_64+0x57/0x190
[ 282.777323] entry_SYSCALL_64_after_hwframe+0x5c/0xc1
[ 282.777324] RIP: 0033:0x7f25b85c0fd2
[ 282.777326] Code: c0 e9 c2 fe ff ff 50 48 8d 3d aa cb 0a 00 e8 d5 1a 02 00 0f 1f 44 00 00 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 0f 05 <48> 3d 00 f0 ff ff 77 56 c3 0f 1f 44 00 00 48 83 ec 28 48 89 54 24
[ 282.777327] RSP: 002b:00007ffd78506a58 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
[ 282.777328] RAX: ffffffffffffffda RBX: 00007f25b7f88028 RCX: 00007f25b85c0fd2
[ 282.777329] RDX: 0000000000040000 RSI: 00007f25b7f88038 RDI: 0000000000000003
[ 282.777330] RBP: 000055cabafa39a0 R08: 00007f25b7f88010 R09: 0000000000000000
[ 282.777331] R10: 0000000000000022 R11: 0000000000000246 R12: 000000003ffc0000
[ 282.777333] R13: 0000000000040000 R14: 00007f25b7f88010 R15: 000055cabafa39f0
[ 282.777429] [spu_mem_blk_rw_page] cpu 0 pid 2801 comm mount sector 2097032 page_address 0xffff987a23212000 op 0 page_idx 262129
static const struct block_device_operations xblk_fops = {
.owner = THIS_MODULE,
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 9, 0)
.submit_bio = mem_blk_submit_bio,
#endif
.rw_page = mem_blk_rw_page,
};
static int mem_blk_disk_init(void)
{
int err = 0;
xblk.file = filp_open( BLK_FILE_PATH, O_RDWR | O_CREAT, 0644);
if ( IS_ERR(xblk.file) ) {
pr_err("Failed to open file\n");
err = PTR_ERR(xblk.file);
return err;
}
xblk_major = register_blkdev(0, "mem_blk");
if (xblk_major < 0) {
filp_close( xblk.file, NULL );
pr_err("register_blkdev returns %d\n", xblk_major);
return xblk_major;
}
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 14, 0)
xblk.mem_blk_disk = blk_alloc_disk(NUMA_NO_NODE);
#else
xblk.mem_blk_disk = alloc_disk(1);
#endif
if (xblk.mem_blk_disk == NULL) {
pr_err("alloc_disk failed.");
filp_close( xblk.file, NULL );
return -ENOMEM;
}
xblk.mem_blk_disk->major = xblk_major;
xblk.mem_blk_disk->first_minor = 0;
xblk.mem_blk_disk->minors = 1;
xblk.mem_blk_disk->fops = &xblk_fops;
xblk.mem_blk_disk->private_data = &xblk;
strlcpy(xblk.mem_blk_disk->disk_name, "mem_blk", 12);
set_capacity(xblk.mem_blk_disk, g_size_gb * 1024 * 1024 * 2);
#if LINUX_VERSION_CODE < KERNEL_VERSION(5, 14, 0)
xblk.mem_blk_disk->queue = xblk.mem_blk_queue;
#endif
blk_queue_physical_block_size(xblk.mem_blk_disk->queue, PAGE_SIZE);
blk_queue_flag_set(QUEUE_FLAG_NONROT, xblk.mem_blk_disk->queue);
blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, xblk.mem_blk_disk->queue);
add_disk(xblk.mem_blk_disk);
return 0;
}
struct bio_vec {
struct page *bv_page;
unsigned int bv_len;
unsigned int bv_offset;
};
struct bvec_iter {
sector_t bi_sector;
unsigned int bi_size;
unsigned int bi_idx;
unsigned int bi_bvec_done;
};
static blk_qc_t mem_blk_submit_bio(struct request_queue *queue, struct bio *bio)
#endif
{
sector_t sector = bio->bi_iter.bi_sector;
struct bio_vec bvec;
struct bvec_iter iter;
bio_for_each_segment(bvec, bio, iter) {
unsigned int len = bvec.bv_len;
int err;
if (len != PAGE_SIZE) {
pr_info("[mem_blk_submit_bio] unexpected page size %d\n", len);
goto io_error;
}
if (err)
goto io_error;
sector += len >> SECTOR_SHIFT;
}
bio_endio(bio);
return BLK_QC_T_NONE;
io_error:
bio_io_error(bio);
return BLK_QC_T_NONE;
}