^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Copyright (C) 2018 Cambridge Greys Ltd
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Copyright (C) 2015-2016 Anton Ivanov (aivanov@brocade.com)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (C) 2000 Jeff Dike (jdike@karaya.com)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) /* 2001-09-28...2002-04-17
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * Partition stuff by James_McMechan@hotmail.com
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * old style ubd by setting UBD_SHIFT to 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) * 2002-09-27...2002-10-18 massive tinkering for 2.5
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) * partitions have changed in 2.5
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) * 2003-01-29 more tinkering for 2.5.59-1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) * This should now address the sysfs problems and has
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) * the symlink for devfs to allow for booting with
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) * the common /dev/ubd/discX/... names rather than
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) * only /dev/ubdN/discN this version also has lots of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) * clean ups preparing for ubd-many.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) * James McMechan
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #define UBD_SHIFT 4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #include <linux/blkdev.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #include <linux/blk-mq.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #include <linux/ata.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #include <linux/hdreg.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #include <linux/cdrom.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #include <linux/proc_fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) #include <linux/seq_file.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) #include <linux/ctype.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) #include <linux/vmalloc.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) #include <linux/scatterlist.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) #include <asm/tlbflush.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) #include <kern_util.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) #include "mconsole_kern.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) #include <init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) #include <irq_kern.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) #include "ubd.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) #include <os.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) #include "cow.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) /* Max request size is determined by sector mask - 32K */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) #define UBD_MAX_REQUEST (8 * sizeof(long))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) struct io_desc {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) char *buffer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) unsigned long length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) unsigned long sector_mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) unsigned long long cow_offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) unsigned long bitmap_words[2];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) struct io_thread_req {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) struct request *req;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) int fds[2];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) unsigned long offsets[2];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) unsigned long long offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) int sectorsize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) int error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) int desc_cnt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) /* io_desc has to be the last element of the struct */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) struct io_desc io_desc[];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) static struct io_thread_req * (*irq_req_buffer)[];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) static struct io_thread_req *irq_remainder;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) static int irq_remainder_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) static struct io_thread_req * (*io_req_buffer)[];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) static struct io_thread_req *io_remainder;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) static int io_remainder_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) static inline int ubd_test_bit(__u64 bit, unsigned char *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) __u64 n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) int bits, off;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) bits = sizeof(data[0]) * 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) n = bit / bits;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) off = bit % bits;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) return (data[n] & (1 << off)) != 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) static inline void ubd_set_bit(__u64 bit, unsigned char *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) __u64 n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) int bits, off;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) bits = sizeof(data[0]) * 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) n = bit / bits;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) off = bit % bits;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) data[n] |= (1 << off);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) /*End stuff from ubd_user.h*/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) #define DRIVER_NAME "uml-blkdev"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) static DEFINE_MUTEX(ubd_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) static DEFINE_MUTEX(ubd_mutex); /* replaces BKL, might not be needed */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) static int ubd_open(struct block_device *bdev, fmode_t mode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) static void ubd_release(struct gendisk *disk, fmode_t mode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) static int ubd_ioctl(struct block_device *bdev, fmode_t mode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) unsigned int cmd, unsigned long arg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) static int ubd_getgeo(struct block_device *bdev, struct hd_geometry *geo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) #define MAX_DEV (16)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) static const struct block_device_operations ubd_blops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) .owner = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) .open = ubd_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) .release = ubd_release,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) .ioctl = ubd_ioctl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) .compat_ioctl = blkdev_compat_ptr_ioctl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) .getgeo = ubd_getgeo,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) /* Protected by ubd_lock */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) static int fake_major = UBD_MAJOR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) static struct gendisk *ubd_gendisk[MAX_DEV];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) static struct gendisk *fake_gendisk[MAX_DEV];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) #ifdef CONFIG_BLK_DEV_UBD_SYNC
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) #define OPEN_FLAGS ((struct openflags) { .r = 1, .w = 1, .s = 1, .c = 0, \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) .cl = 1 })
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) #define OPEN_FLAGS ((struct openflags) { .r = 1, .w = 1, .s = 0, .c = 0, \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) .cl = 1 })
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) static struct openflags global_openflags = OPEN_FLAGS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) struct cow {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) /* backing file name */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) char *file;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) /* backing file fd */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) int fd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) unsigned long *bitmap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) unsigned long bitmap_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) int bitmap_offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) int data_offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) #define MAX_SG 64
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) struct ubd {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) /* name (and fd, below) of the file opened for writing, either the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) * backing or the cow file. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) char *file;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) int count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) int fd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) __u64 size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) struct openflags boot_openflags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) struct openflags openflags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) unsigned shared:1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) unsigned no_cow:1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) unsigned no_trim:1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) struct cow cow;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) struct platform_device pdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) struct request_queue *queue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) struct blk_mq_tag_set tag_set;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) spinlock_t lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) #define DEFAULT_COW { \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) .file = NULL, \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) .fd = -1, \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) .bitmap = NULL, \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) .bitmap_offset = 0, \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) .data_offset = 0, \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) #define DEFAULT_UBD { \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) .file = NULL, \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) .count = 0, \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) .fd = -1, \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) .size = -1, \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) .boot_openflags = OPEN_FLAGS, \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) .openflags = OPEN_FLAGS, \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) .no_cow = 0, \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) .no_trim = 0, \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) .shared = 0, \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) .cow = DEFAULT_COW, \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) .lock = __SPIN_LOCK_UNLOCKED(ubd_devs.lock), \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) /* Protected by ubd_lock */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) static struct ubd ubd_devs[MAX_DEV] = { [0 ... MAX_DEV - 1] = DEFAULT_UBD };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) /* Only changed by fake_ide_setup which is a setup */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) static int fake_ide = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) static struct proc_dir_entry *proc_ide_root = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) static struct proc_dir_entry *proc_ide = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) static blk_status_t ubd_queue_rq(struct blk_mq_hw_ctx *hctx,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) const struct blk_mq_queue_data *bd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) static void make_proc_ide(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) proc_ide_root = proc_mkdir("ide", NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) proc_ide = proc_mkdir("ide0", proc_ide_root);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) static int fake_ide_media_proc_show(struct seq_file *m, void *v)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) seq_puts(m, "disk\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) static void make_ide_entries(const char *dev_name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) struct proc_dir_entry *dir, *ent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) char name[64];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) if(proc_ide_root == NULL) make_proc_ide();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) dir = proc_mkdir(dev_name, proc_ide);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) if(!dir) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) ent = proc_create_single("media", S_IRUGO, dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) fake_ide_media_proc_show);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) if(!ent) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) snprintf(name, sizeof(name), "ide0/%s", dev_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) proc_symlink(dev_name, proc_ide_root, name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) static int fake_ide_setup(char *str)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) fake_ide = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) __setup("fake_ide", fake_ide_setup);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) __uml_help(fake_ide_setup,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) "fake_ide\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) " Create ide0 entries that map onto ubd devices.\n\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) );
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) static int parse_unit(char **ptr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) char *str = *ptr, *end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) int n = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) if(isdigit(*str)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) n = simple_strtoul(str, &end, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) if(end == str)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) *ptr = end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) else if (('a' <= *str) && (*str <= 'z')) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) n = *str - 'a';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) str++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) *ptr = str;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) return n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) /* If *index_out == -1 at exit, the passed option was a general one;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) * otherwise, the str pointer is used (and owned) inside ubd_devs array, so it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) * should not be freed on exit.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) static int ubd_setup_common(char *str, int *index_out, char **error_out)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) struct ubd *ubd_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) struct openflags flags = global_openflags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) char *backing_file;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) int n, err = 0, i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) if(index_out) *index_out = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) n = *str;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) if(n == '='){
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) char *end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) int major;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) str++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) if(!strcmp(str, "sync")){
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) global_openflags = of_sync(global_openflags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) err = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) major = simple_strtoul(str, &end, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) if((*end != '\0') || (end == str)){
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) *error_out = "Didn't parse major number";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) mutex_lock(&ubd_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) if (fake_major != UBD_MAJOR) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) *error_out = "Can't assign a fake major twice";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) goto out1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) fake_major = major;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) printk(KERN_INFO "Setting extra ubd major number to %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) major);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) out1:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) mutex_unlock(&ubd_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) n = parse_unit(&str);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) if(n < 0){
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) *error_out = "Couldn't parse device number";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) if(n >= MAX_DEV){
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) *error_out = "Device number out of range";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) err = -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) mutex_lock(&ubd_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) ubd_dev = &ubd_devs[n];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) if(ubd_dev->file != NULL){
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) *error_out = "Device is already configured";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) if (index_out)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) *index_out = n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) err = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) for (i = 0; i < sizeof("rscdt="); i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) switch (*str) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) case 'r':
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) flags.w = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) case 's':
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) flags.s = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) case 'd':
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) ubd_dev->no_cow = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) case 'c':
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) ubd_dev->shared = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) case 't':
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) ubd_dev->no_trim = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) case '=':
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) str++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) goto break_loop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) *error_out = "Expected '=' or flag letter "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) "(r, s, c, t or d)";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) str++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) if (*str == '=')
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) *error_out = "Too many flags specified";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) *error_out = "Missing '='";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) break_loop:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) backing_file = strchr(str, ',');
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) if (backing_file == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) backing_file = strchr(str, ':');
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) if(backing_file != NULL){
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) if(ubd_dev->no_cow){
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) *error_out = "Can't specify both 'd' and a cow file";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) *backing_file = '\0';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) backing_file++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) ubd_dev->file = str;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) ubd_dev->cow.file = backing_file;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) ubd_dev->boot_openflags = flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) mutex_unlock(&ubd_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) static int ubd_setup(char *str)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) char *error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) err = ubd_setup_common(str, NULL, &error);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) if(err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) printk(KERN_ERR "Failed to initialize device with \"%s\" : "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) "%s\n", str, error);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) __setup("ubd", ubd_setup);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) __uml_help(ubd_setup,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) "ubd<n><flags>=<filename>[(:|,)<filename2>]\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) " This is used to associate a device with a file in the underlying\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) " filesystem. When specifying two filenames, the first one is the\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) " COW name and the second is the backing file name. As separator you can\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) " use either a ':' or a ',': the first one allows writing things like;\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) " ubd0=~/Uml/root_cow:~/Uml/root_backing_file\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) " while with a ',' the shell would not expand the 2nd '~'.\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) " When using only one filename, UML will detect whether to treat it like\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) " a COW file or a backing file. To override this detection, add the 'd'\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) " flag:\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) " ubd0d=BackingFile\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) " Usually, there is a filesystem in the file, but \n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) " that's not required. Swap devices containing swap files can be\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) " specified like this. Also, a file which doesn't contain a\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) " filesystem can have its contents read in the virtual \n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) " machine by running 'dd' on the device. <n> must be in the range\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) " 0 to 7. Appending an 'r' to the number will cause that device\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) " to be mounted read-only. For example ubd1r=./ext_fs. Appending\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) " an 's' will cause data to be written to disk on the host immediately.\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) " 'c' will cause the device to be treated as being shared between multiple\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) " UMLs and file locking will be turned off - this is appropriate for a\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) " cluster filesystem and inappropriate at almost all other times.\n\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) " 't' will disable trim/discard support on the device (enabled by default).\n\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) );
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) static int udb_setup(char *str)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) printk("udb%s specified on command line is almost certainly a ubd -> "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) "udb TYPO\n", str);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) __setup("udb", udb_setup);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) __uml_help(udb_setup,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) "udb\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) " This option is here solely to catch ubd -> udb typos, which can be\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) " to impossible to catch visually unless you specifically look for\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) " them. The only result of any option starting with 'udb' is an error\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) " in the boot output.\n\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) );
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) /* Only changed by ubd_init, which is an initcall. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) static int thread_fd = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) /* Function to read several request pointers at a time
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) * handling fractional reads if (and as) needed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) static int bulk_req_safe_read(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) int fd,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) struct io_thread_req * (*request_buffer)[],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) struct io_thread_req **remainder,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) int *remainder_size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) int max_recs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) )
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) int n = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) int res = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) if (*remainder_size > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) memmove(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) (char *) request_buffer,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) (char *) remainder, *remainder_size
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) );
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) n = *remainder_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) res = os_read_file(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) fd,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) ((char *) request_buffer) + *remainder_size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) sizeof(struct io_thread_req *)*max_recs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) - *remainder_size
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) );
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) if (res > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) n += res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) if ((n % sizeof(struct io_thread_req *)) > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) * Read somehow returned not a multiple of dword
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) * theoretically possible, but never observed in the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) * wild, so read routine must be able to handle it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) *remainder_size = n % sizeof(struct io_thread_req *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) WARN(*remainder_size > 0, "UBD IPC read returned a partial result");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) memmove(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) remainder,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) ((char *) request_buffer) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) (n/sizeof(struct io_thread_req *))*sizeof(struct io_thread_req *),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) *remainder_size
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) );
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) n = n - *remainder_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) n = res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) return n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) /* Called without dev->lock held, and only in interrupt context. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) static void ubd_handler(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) int n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) int count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) while(1){
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) n = bulk_req_safe_read(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) thread_fd,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) irq_req_buffer,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) &irq_remainder,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) &irq_remainder_size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) UBD_REQ_BUFFER_SIZE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) );
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) if (n < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) if(n == -EAGAIN)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) printk(KERN_ERR "spurious interrupt in ubd_handler, "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) "err = %d\n", -n);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) for (count = 0; count < n/sizeof(struct io_thread_req *); count++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) struct io_thread_req *io_req = (*irq_req_buffer)[count];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) if ((io_req->error == BLK_STS_NOTSUPP) && (req_op(io_req->req) == REQ_OP_DISCARD)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) blk_queue_max_discard_sectors(io_req->req->q, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) blk_queue_max_write_zeroes_sectors(io_req->req->q, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) blk_queue_flag_clear(QUEUE_FLAG_DISCARD, io_req->req->q);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) blk_mq_end_request(io_req->req, io_req->error);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) kfree(io_req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) static irqreturn_t ubd_intr(int irq, void *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) ubd_handler();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) return IRQ_HANDLED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) /* Only changed by ubd_init, which is an initcall. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) static int io_pid = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) static void kill_io_thread(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) if(io_pid != -1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) os_kill_process(io_pid, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) __uml_exitcall(kill_io_thread);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) static inline int ubd_file_size(struct ubd *ubd_dev, __u64 *size_out)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) char *file;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561) int fd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) __u32 version;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) __u32 align;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) char *backing_file;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567) time64_t mtime;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) unsigned long long size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) int sector_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570) int bitmap_offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) if (ubd_dev->file && ubd_dev->cow.file) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573) file = ubd_dev->cow.file;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) fd = os_open_file(ubd_dev->file, of_read(OPENFLAGS()), 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579) if (fd < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580) return fd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) err = read_cow_header(file_reader, &fd, &version, &backing_file, \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) &mtime, &size, §or_size, &align, &bitmap_offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) os_close_file(fd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586) if(err == -EINVAL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) file = ubd_dev->file;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) file = backing_file;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) return os_file_size(file, size_out);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595) static int read_cow_bitmap(int fd, void *buf, int offset, int len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599) err = os_pread_file(fd, buf, len, offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600) if (err < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606) static int backing_file_mismatch(char *file, __u64 size, time64_t mtime)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608) time64_t modtime;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609) unsigned long long actual;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612) err = os_file_modtime(file, &modtime);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613) if (err < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) printk(KERN_ERR "Failed to get modification time of backing "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) "file \"%s\", err = %d\n", file, -err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619) err = os_file_size(file, &actual);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620) if (err < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621) printk(KERN_ERR "Failed to get size of backing file \"%s\", "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622) "err = %d\n", file, -err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626) if (actual != size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627) /*__u64 can be a long on AMD64 and with %lu GCC complains; so
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628) * the typecast.*/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629) printk(KERN_ERR "Size mismatch (%llu vs %llu) of COW header "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630) "vs backing file\n", (unsigned long long) size, actual);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633) if (modtime != mtime) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634) printk(KERN_ERR "mtime mismatch (%lld vs %lld) of COW header vs "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635) "backing file\n", mtime, modtime);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641) static int path_requires_switch(char *from_cmdline, char *from_cow, char *cow)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643) struct uml_stat buf1, buf2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646) if (from_cmdline == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648) if (!strcmp(from_cmdline, from_cow))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 649) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 650)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 651) err = os_stat_file(from_cmdline, &buf1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 652) if (err < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 653) printk(KERN_ERR "Couldn't stat '%s', err = %d\n", from_cmdline,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 654) -err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 655) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 656) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 657) err = os_stat_file(from_cow, &buf2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 658) if (err < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 659) printk(KERN_ERR "Couldn't stat '%s', err = %d\n", from_cow,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 660) -err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 661) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 662) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 663) if ((buf1.ust_dev == buf2.ust_dev) && (buf1.ust_ino == buf2.ust_ino))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 664) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 665)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 666) printk(KERN_ERR "Backing file mismatch - \"%s\" requested, "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 667) "\"%s\" specified in COW header of \"%s\"\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 668) from_cmdline, from_cow, cow);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 669) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 670) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 671)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 672) static int open_ubd_file(char *file, struct openflags *openflags, int shared,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 673) char **backing_file_out, int *bitmap_offset_out,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 674) unsigned long *bitmap_len_out, int *data_offset_out,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 675) int *create_cow_out)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 676) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 677) time64_t mtime;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 678) unsigned long long size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 679) __u32 version, align;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 680) char *backing_file;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 681) int fd, err, sectorsize, asked_switch, mode = 0644;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 682)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 683) fd = os_open_file(file, *openflags, mode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 684) if (fd < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 685) if ((fd == -ENOENT) && (create_cow_out != NULL))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 686) *create_cow_out = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 687) if (!openflags->w ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 688) ((fd != -EROFS) && (fd != -EACCES)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 689) return fd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 690) openflags->w = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 691) fd = os_open_file(file, *openflags, mode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 692) if (fd < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 693) return fd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 694) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 695)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 696) if (shared)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 697) printk(KERN_INFO "Not locking \"%s\" on the host\n", file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 698) else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 699) err = os_lock_file(fd, openflags->w);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 700) if (err < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 701) printk(KERN_ERR "Failed to lock '%s', err = %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 702) file, -err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 703) goto out_close;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 704) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 705) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 706)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 707) /* Successful return case! */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 708) if (backing_file_out == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 709) return fd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 710)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 711) err = read_cow_header(file_reader, &fd, &version, &backing_file, &mtime,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 712) &size, §orsize, &align, bitmap_offset_out);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 713) if (err && (*backing_file_out != NULL)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 714) printk(KERN_ERR "Failed to read COW header from COW file "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 715) "\"%s\", errno = %d\n", file, -err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 716) goto out_close;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 717) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 718) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 719) return fd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 720)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 721) asked_switch = path_requires_switch(*backing_file_out, backing_file,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 722) file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 723)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 724) /* Allow switching only if no mismatch. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 725) if (asked_switch && !backing_file_mismatch(*backing_file_out, size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 726) mtime)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 727) printk(KERN_ERR "Switching backing file to '%s'\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 728) *backing_file_out);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 729) err = write_cow_header(file, fd, *backing_file_out,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 730) sectorsize, align, &size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 731) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 732) printk(KERN_ERR "Switch failed, errno = %d\n", -err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 733) goto out_close;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 734) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 735) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 736) *backing_file_out = backing_file;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 737) err = backing_file_mismatch(*backing_file_out, size, mtime);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 738) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 739) goto out_close;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 740) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 741)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 742) cow_sizes(version, size, sectorsize, align, *bitmap_offset_out,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 743) bitmap_len_out, data_offset_out);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 744)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 745) return fd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 746) out_close:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 747) os_close_file(fd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 748) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 749) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 750)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 751) static int create_cow_file(char *cow_file, char *backing_file,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 752) struct openflags flags,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 753) int sectorsize, int alignment, int *bitmap_offset_out,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 754) unsigned long *bitmap_len_out, int *data_offset_out)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 755) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 756) int err, fd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 757)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 758) flags.c = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 759) fd = open_ubd_file(cow_file, &flags, 0, NULL, NULL, NULL, NULL, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 760) if (fd < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 761) err = fd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 762) printk(KERN_ERR "Open of COW file '%s' failed, errno = %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 763) cow_file, -err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 764) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 765) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 766)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 767) err = init_cow_file(fd, cow_file, backing_file, sectorsize, alignment,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 768) bitmap_offset_out, bitmap_len_out,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 769) data_offset_out);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 770) if (!err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 771) return fd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 772) os_close_file(fd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 773) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 774) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 775) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 776)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 777) static void ubd_close_dev(struct ubd *ubd_dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 778) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 779) os_close_file(ubd_dev->fd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 780) if(ubd_dev->cow.file == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 781) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 782)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 783) os_close_file(ubd_dev->cow.fd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 784) vfree(ubd_dev->cow.bitmap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 785) ubd_dev->cow.bitmap = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 786) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 787)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 788) static int ubd_open_dev(struct ubd *ubd_dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 789) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 790) struct openflags flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 791) char **back_ptr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 792) int err, create_cow, *create_ptr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 793) int fd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 794)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 795) ubd_dev->openflags = ubd_dev->boot_openflags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 796) create_cow = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 797) create_ptr = (ubd_dev->cow.file != NULL) ? &create_cow : NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 798) back_ptr = ubd_dev->no_cow ? NULL : &ubd_dev->cow.file;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 799)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 800) fd = open_ubd_file(ubd_dev->file, &ubd_dev->openflags, ubd_dev->shared,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 801) back_ptr, &ubd_dev->cow.bitmap_offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 802) &ubd_dev->cow.bitmap_len, &ubd_dev->cow.data_offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 803) create_ptr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 804)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 805) if((fd == -ENOENT) && create_cow){
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 806) fd = create_cow_file(ubd_dev->file, ubd_dev->cow.file,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 807) ubd_dev->openflags, SECTOR_SIZE, PAGE_SIZE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 808) &ubd_dev->cow.bitmap_offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 809) &ubd_dev->cow.bitmap_len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 810) &ubd_dev->cow.data_offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 811) if(fd >= 0){
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 812) printk(KERN_INFO "Creating \"%s\" as COW file for "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 813) "\"%s\"\n", ubd_dev->file, ubd_dev->cow.file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 814) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 815) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 816)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 817) if(fd < 0){
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 818) printk("Failed to open '%s', errno = %d\n", ubd_dev->file,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 819) -fd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 820) return fd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 821) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 822) ubd_dev->fd = fd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 823)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 824) if(ubd_dev->cow.file != NULL){
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 825) blk_queue_max_hw_sectors(ubd_dev->queue, 8 * sizeof(long));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 826)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 827) err = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 828) ubd_dev->cow.bitmap = vmalloc(ubd_dev->cow.bitmap_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 829) if(ubd_dev->cow.bitmap == NULL){
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 830) printk(KERN_ERR "Failed to vmalloc COW bitmap\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 831) goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 832) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 833) flush_tlb_kernel_vm();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 834)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 835) err = read_cow_bitmap(ubd_dev->fd, ubd_dev->cow.bitmap,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 836) ubd_dev->cow.bitmap_offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 837) ubd_dev->cow.bitmap_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 838) if(err < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 839) goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 840)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 841) flags = ubd_dev->openflags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 842) flags.w = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 843) err = open_ubd_file(ubd_dev->cow.file, &flags, ubd_dev->shared, NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 844) NULL, NULL, NULL, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 845) if(err < 0) goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 846) ubd_dev->cow.fd = err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 847) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 848) if (ubd_dev->no_trim == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 849) ubd_dev->queue->limits.discard_granularity = SECTOR_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 850) ubd_dev->queue->limits.discard_alignment = SECTOR_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 851) blk_queue_max_discard_sectors(ubd_dev->queue, UBD_MAX_REQUEST);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 852) blk_queue_max_write_zeroes_sectors(ubd_dev->queue, UBD_MAX_REQUEST);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 853) blk_queue_flag_set(QUEUE_FLAG_DISCARD, ubd_dev->queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 854) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 855) blk_queue_flag_set(QUEUE_FLAG_NONROT, ubd_dev->queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 856) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 857) error:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 858) os_close_file(ubd_dev->fd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 859) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 860) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 861)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 862) static void ubd_device_release(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 863) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 864) struct ubd *ubd_dev = dev_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 865)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 866) blk_cleanup_queue(ubd_dev->queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 867) blk_mq_free_tag_set(&ubd_dev->tag_set);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 868) *ubd_dev = ((struct ubd) DEFAULT_UBD);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 869) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 870)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 871) static int ubd_disk_register(int major, u64 size, int unit,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 872) struct gendisk **disk_out)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 873) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 874) struct device *parent = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 875) struct gendisk *disk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 876)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 877) disk = alloc_disk(1 << UBD_SHIFT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 878) if(disk == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 879) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 880)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 881) disk->major = major;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 882) disk->first_minor = unit << UBD_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 883) disk->fops = &ubd_blops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 884) set_capacity(disk, size / 512);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 885) if (major == UBD_MAJOR)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 886) sprintf(disk->disk_name, "ubd%c", 'a' + unit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 887) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 888) sprintf(disk->disk_name, "ubd_fake%d", unit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 889)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 890) /* sysfs register (not for ide fake devices) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 891) if (major == UBD_MAJOR) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 892) ubd_devs[unit].pdev.id = unit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 893) ubd_devs[unit].pdev.name = DRIVER_NAME;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 894) ubd_devs[unit].pdev.dev.release = ubd_device_release;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 895) dev_set_drvdata(&ubd_devs[unit].pdev.dev, &ubd_devs[unit]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 896) platform_device_register(&ubd_devs[unit].pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 897) parent = &ubd_devs[unit].pdev.dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 898) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 899)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 900) disk->private_data = &ubd_devs[unit];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 901) disk->queue = ubd_devs[unit].queue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 902) device_add_disk(parent, disk, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 903)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 904) *disk_out = disk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 905) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 906) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 907)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 908) #define ROUND_BLOCK(n) ((n + (SECTOR_SIZE - 1)) & (-SECTOR_SIZE))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 909)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 910) static const struct blk_mq_ops ubd_mq_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 911) .queue_rq = ubd_queue_rq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 912) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 913)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 914) static int ubd_add(int n, char **error_out)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 915) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 916) struct ubd *ubd_dev = &ubd_devs[n];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 917) int err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 918)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 919) if(ubd_dev->file == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 920) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 921)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 922) err = ubd_file_size(ubd_dev, &ubd_dev->size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 923) if(err < 0){
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 924) *error_out = "Couldn't determine size of device's file";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 925) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 926) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 927)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 928) ubd_dev->size = ROUND_BLOCK(ubd_dev->size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 929)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 930) ubd_dev->tag_set.ops = &ubd_mq_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 931) ubd_dev->tag_set.queue_depth = 64;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 932) ubd_dev->tag_set.numa_node = NUMA_NO_NODE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 933) ubd_dev->tag_set.flags = BLK_MQ_F_SHOULD_MERGE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 934) ubd_dev->tag_set.driver_data = ubd_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 935) ubd_dev->tag_set.nr_hw_queues = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 936)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 937) err = blk_mq_alloc_tag_set(&ubd_dev->tag_set);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 938) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 939) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 940)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 941) ubd_dev->queue = blk_mq_init_queue(&ubd_dev->tag_set);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 942) if (IS_ERR(ubd_dev->queue)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 943) err = PTR_ERR(ubd_dev->queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 944) goto out_cleanup_tags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 945) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 946)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 947) ubd_dev->queue->queuedata = ubd_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 948) blk_queue_write_cache(ubd_dev->queue, true, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 949)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 950) blk_queue_max_segments(ubd_dev->queue, MAX_SG);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 951) blk_queue_segment_boundary(ubd_dev->queue, PAGE_SIZE - 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 952) err = ubd_disk_register(UBD_MAJOR, ubd_dev->size, n, &ubd_gendisk[n]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 953) if(err){
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 954) *error_out = "Failed to register device";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 955) goto out_cleanup_tags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 956) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 957)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 958) if (fake_major != UBD_MAJOR)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 959) ubd_disk_register(fake_major, ubd_dev->size, n,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 960) &fake_gendisk[n]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 961)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 962) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 963) * Perhaps this should also be under the "if (fake_major)" above
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 964) * using the fake_disk->disk_name
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 965) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 966) if (fake_ide)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 967) make_ide_entries(ubd_gendisk[n]->disk_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 968)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 969) err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 970) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 971) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 972)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 973) out_cleanup_tags:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 974) blk_mq_free_tag_set(&ubd_dev->tag_set);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 975) if (!(IS_ERR(ubd_dev->queue)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 976) blk_cleanup_queue(ubd_dev->queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 977) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 978) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 979)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 980) static int ubd_config(char *str, char **error_out)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 981) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 982) int n, ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 983)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 984) /* This string is possibly broken up and stored, so it's only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 985) * freed if ubd_setup_common fails, or if only general options
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 986) * were set.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 987) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 988) str = kstrdup(str, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 989) if (str == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 990) *error_out = "Failed to allocate memory";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 991) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 992) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 993)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 994) ret = ubd_setup_common(str, &n, error_out);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 995) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 996) goto err_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 997)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 998) if (n == -1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 999) ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1000) goto err_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1001) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1002)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1003) mutex_lock(&ubd_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1004) ret = ubd_add(n, error_out);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1005) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1006) ubd_devs[n].file = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1007) mutex_unlock(&ubd_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1008)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1009) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1010) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1011)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1012) err_free:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1013) kfree(str);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1014) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1015) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1016)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1017) static int ubd_get_config(char *name, char *str, int size, char **error_out)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1018) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1019) struct ubd *ubd_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1020) int n, len = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1021)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1022) n = parse_unit(&name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1023) if((n >= MAX_DEV) || (n < 0)){
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1024) *error_out = "ubd_get_config : device number out of range";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1025) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1026) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1027)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1028) ubd_dev = &ubd_devs[n];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1029) mutex_lock(&ubd_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1030)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1031) if(ubd_dev->file == NULL){
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1032) CONFIG_CHUNK(str, size, len, "", 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1033) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1034) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1035)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1036) CONFIG_CHUNK(str, size, len, ubd_dev->file, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1037)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1038) if(ubd_dev->cow.file != NULL){
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1039) CONFIG_CHUNK(str, size, len, ",", 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1040) CONFIG_CHUNK(str, size, len, ubd_dev->cow.file, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1041) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1042) else CONFIG_CHUNK(str, size, len, "", 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1043)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1044) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1045) mutex_unlock(&ubd_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1046) return len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1047) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1048)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1049) static int ubd_id(char **str, int *start_out, int *end_out)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1050) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1051) int n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1052)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1053) n = parse_unit(str);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1054) *start_out = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1055) *end_out = MAX_DEV - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1056) return n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1057) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1058)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1059) static int ubd_remove(int n, char **error_out)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1060) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1061) struct gendisk *disk = ubd_gendisk[n];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1062) struct ubd *ubd_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1063) int err = -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1064)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1065) mutex_lock(&ubd_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1066)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1067) ubd_dev = &ubd_devs[n];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1068)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1069) if(ubd_dev->file == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1070) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1071)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1072) /* you cannot remove a open disk */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1073) err = -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1074) if(ubd_dev->count > 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1075) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1076)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1077) ubd_gendisk[n] = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1078) if(disk != NULL){
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1079) del_gendisk(disk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1080) put_disk(disk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1081) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1082)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1083) if(fake_gendisk[n] != NULL){
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1084) del_gendisk(fake_gendisk[n]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1085) put_disk(fake_gendisk[n]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1086) fake_gendisk[n] = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1087) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1088)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1089) err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1090) platform_device_unregister(&ubd_dev->pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1091) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1092) mutex_unlock(&ubd_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1093) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1094) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1095)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1096) /* All these are called by mconsole in process context and without
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1097) * ubd-specific locks. The structure itself is const except for .list.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1098) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1099) static struct mc_device ubd_mc = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1100) .list = LIST_HEAD_INIT(ubd_mc.list),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1101) .name = "ubd",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1102) .config = ubd_config,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1103) .get_config = ubd_get_config,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1104) .id = ubd_id,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1105) .remove = ubd_remove,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1106) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1107)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1108) static int __init ubd_mc_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1109) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1110) mconsole_register_dev(&ubd_mc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1111) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1112) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1113)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1114) __initcall(ubd_mc_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1115)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1116) static int __init ubd0_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1117) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1118) struct ubd *ubd_dev = &ubd_devs[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1119)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1120) mutex_lock(&ubd_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1121) if(ubd_dev->file == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1122) ubd_dev->file = "root_fs";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1123) mutex_unlock(&ubd_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1124)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1125) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1126) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1127)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1128) __initcall(ubd0_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1129)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1130) /* Used in ubd_init, which is an initcall */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1131) static struct platform_driver ubd_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1132) .driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1133) .name = DRIVER_NAME,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1134) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1135) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1136)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1137) static int __init ubd_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1138) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1139) char *error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1140) int i, err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1141)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1142) if (register_blkdev(UBD_MAJOR, "ubd"))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1143) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1144)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1145) if (fake_major != UBD_MAJOR) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1146) char name[sizeof("ubd_nnn\0")];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1147)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1148) snprintf(name, sizeof(name), "ubd_%d", fake_major);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1149) if (register_blkdev(fake_major, "ubd"))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1150) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1151) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1152)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1153) irq_req_buffer = kmalloc_array(UBD_REQ_BUFFER_SIZE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1154) sizeof(struct io_thread_req *),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1155) GFP_KERNEL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1156) );
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1157) irq_remainder = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1158)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1159) if (irq_req_buffer == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1160) printk(KERN_ERR "Failed to initialize ubd buffering\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1161) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1162) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1163) io_req_buffer = kmalloc_array(UBD_REQ_BUFFER_SIZE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1164) sizeof(struct io_thread_req *),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1165) GFP_KERNEL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1166) );
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1167)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1168) io_remainder = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1169)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1170) if (io_req_buffer == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1171) printk(KERN_ERR "Failed to initialize ubd buffering\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1172) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1173) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1174) platform_driver_register(&ubd_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1175) mutex_lock(&ubd_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1176) for (i = 0; i < MAX_DEV; i++){
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1177) err = ubd_add(i, &error);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1178) if(err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1179) printk(KERN_ERR "Failed to initialize ubd device %d :"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1180) "%s\n", i, error);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1181) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1182) mutex_unlock(&ubd_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1183) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1184) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1185)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1186) late_initcall(ubd_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1187)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1188) static int __init ubd_driver_init(void){
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1189) unsigned long stack;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1190) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1191)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1192) /* Set by CONFIG_BLK_DEV_UBD_SYNC or ubd=sync.*/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1193) if(global_openflags.s){
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1194) printk(KERN_INFO "ubd: Synchronous mode\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1195) /* Letting ubd=sync be like using ubd#s= instead of ubd#= is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1196) * enough. So use anyway the io thread. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1197) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1198) stack = alloc_stack(0, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1199) io_pid = start_io_thread(stack + PAGE_SIZE - sizeof(void *),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1200) &thread_fd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1201) if(io_pid < 0){
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1202) printk(KERN_ERR
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1203) "ubd : Failed to start I/O thread (errno = %d) - "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1204) "falling back to synchronous I/O\n", -io_pid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1205) io_pid = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1206) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1207) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1208) err = um_request_irq(UBD_IRQ, thread_fd, IRQ_READ, ubd_intr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1209) 0, "ubd", ubd_devs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1210) if(err != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1211) printk(KERN_ERR "um_request_irq failed - errno = %d\n", -err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1212) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1213) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1214)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1215) device_initcall(ubd_driver_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1216)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1217) static int ubd_open(struct block_device *bdev, fmode_t mode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1218) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1219) struct gendisk *disk = bdev->bd_disk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1220) struct ubd *ubd_dev = disk->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1221) int err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1222)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1223) mutex_lock(&ubd_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1224) if(ubd_dev->count == 0){
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1225) err = ubd_open_dev(ubd_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1226) if(err){
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1227) printk(KERN_ERR "%s: Can't open \"%s\": errno = %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1228) disk->disk_name, ubd_dev->file, -err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1229) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1230) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1231) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1232) ubd_dev->count++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1233) set_disk_ro(disk, !ubd_dev->openflags.w);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1234)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1235) /* This should no more be needed. And it didn't work anyway to exclude
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1236) * read-write remounting of filesystems.*/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1237) /*if((mode & FMODE_WRITE) && !ubd_dev->openflags.w){
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1238) if(--ubd_dev->count == 0) ubd_close_dev(ubd_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1239) err = -EROFS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1240) }*/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1241) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1242) mutex_unlock(&ubd_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1243) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1244) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1245)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1246) static void ubd_release(struct gendisk *disk, fmode_t mode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1247) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1248) struct ubd *ubd_dev = disk->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1249)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1250) mutex_lock(&ubd_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1251) if(--ubd_dev->count == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1252) ubd_close_dev(ubd_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1253) mutex_unlock(&ubd_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1254) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1255)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1256) static void cowify_bitmap(__u64 io_offset, int length, unsigned long *cow_mask,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1257) __u64 *cow_offset, unsigned long *bitmap,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1258) __u64 bitmap_offset, unsigned long *bitmap_words,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1259) __u64 bitmap_len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1260) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1261) __u64 sector = io_offset >> SECTOR_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1262) int i, update_bitmap = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1263)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1264) for (i = 0; i < length >> SECTOR_SHIFT; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1265) if(cow_mask != NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1266) ubd_set_bit(i, (unsigned char *) cow_mask);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1267) if(ubd_test_bit(sector + i, (unsigned char *) bitmap))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1268) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1269)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1270) update_bitmap = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1271) ubd_set_bit(sector + i, (unsigned char *) bitmap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1272) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1273)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1274) if(!update_bitmap)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1275) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1276)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1277) *cow_offset = sector / (sizeof(unsigned long) * 8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1278)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1279) /* This takes care of the case where we're exactly at the end of the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1280) * device, and *cow_offset + 1 is off the end. So, just back it up
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1281) * by one word. Thanks to Lynn Kerby for the fix and James McMechan
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1282) * for the original diagnosis.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1283) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1284) if (*cow_offset == (DIV_ROUND_UP(bitmap_len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1285) sizeof(unsigned long)) - 1))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1286) (*cow_offset)--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1287)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1288) bitmap_words[0] = bitmap[*cow_offset];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1289) bitmap_words[1] = bitmap[*cow_offset + 1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1290)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1291) *cow_offset *= sizeof(unsigned long);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1292) *cow_offset += bitmap_offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1293) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1294)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1295) static void cowify_req(struct io_thread_req *req, struct io_desc *segment,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1296) unsigned long offset, unsigned long *bitmap,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1297) __u64 bitmap_offset, __u64 bitmap_len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1298) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1299) __u64 sector = offset >> SECTOR_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1300) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1301)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1302) if (segment->length > (sizeof(segment->sector_mask) * 8) << SECTOR_SHIFT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1303) panic("Operation too long");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1304)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1305) if (req_op(req->req) == REQ_OP_READ) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1306) for (i = 0; i < segment->length >> SECTOR_SHIFT; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1307) if(ubd_test_bit(sector + i, (unsigned char *) bitmap))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1308) ubd_set_bit(i, (unsigned char *)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1309) &segment->sector_mask);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1310) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1311) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1312) cowify_bitmap(offset, segment->length, &segment->sector_mask,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1313) &segment->cow_offset, bitmap, bitmap_offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1314) segment->bitmap_words, bitmap_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1315) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1316) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1317)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1318) static void ubd_map_req(struct ubd *dev, struct io_thread_req *io_req,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1319) struct request *req)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1320) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1321) struct bio_vec bvec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1322) struct req_iterator iter;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1323) int i = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1324) unsigned long byte_offset = io_req->offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1325) int op = req_op(req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1326)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1327) if (op == REQ_OP_WRITE_ZEROES || op == REQ_OP_DISCARD) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1328) io_req->io_desc[0].buffer = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1329) io_req->io_desc[0].length = blk_rq_bytes(req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1330) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1331) rq_for_each_segment(bvec, req, iter) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1332) BUG_ON(i >= io_req->desc_cnt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1333)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1334) io_req->io_desc[i].buffer =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1335) page_address(bvec.bv_page) + bvec.bv_offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1336) io_req->io_desc[i].length = bvec.bv_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1337) i++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1338) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1339) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1340)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1341) if (dev->cow.file) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1342) for (i = 0; i < io_req->desc_cnt; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1343) cowify_req(io_req, &io_req->io_desc[i], byte_offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1344) dev->cow.bitmap, dev->cow.bitmap_offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1345) dev->cow.bitmap_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1346) byte_offset += io_req->io_desc[i].length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1347) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1348)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1349) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1350) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1351)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1352) static struct io_thread_req *ubd_alloc_req(struct ubd *dev, struct request *req,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1353) int desc_cnt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1354) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1355) struct io_thread_req *io_req;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1356) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1357)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1358) io_req = kmalloc(sizeof(*io_req) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1359) (desc_cnt * sizeof(struct io_desc)),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1360) GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1361) if (!io_req)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1362) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1363)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1364) io_req->req = req;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1365) if (dev->cow.file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1366) io_req->fds[0] = dev->cow.fd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1367) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1368) io_req->fds[0] = dev->fd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1369) io_req->error = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1370) io_req->sectorsize = SECTOR_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1371) io_req->fds[1] = dev->fd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1372) io_req->offset = (u64) blk_rq_pos(req) << SECTOR_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1373) io_req->offsets[0] = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1374) io_req->offsets[1] = dev->cow.data_offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1375)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1376) for (i = 0 ; i < desc_cnt; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1377) io_req->io_desc[i].sector_mask = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1378) io_req->io_desc[i].cow_offset = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1379) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1380)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1381) return io_req;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1382) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1383)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1384) static int ubd_submit_request(struct ubd *dev, struct request *req)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1385) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1386) int segs = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1387) struct io_thread_req *io_req;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1388) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1389) int op = req_op(req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1390)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1391) if (op == REQ_OP_FLUSH)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1392) segs = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1393) else if (op == REQ_OP_WRITE_ZEROES || op == REQ_OP_DISCARD)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1394) segs = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1395) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1396) segs = blk_rq_nr_phys_segments(req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1397)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1398) io_req = ubd_alloc_req(dev, req, segs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1399) if (!io_req)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1400) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1401)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1402) io_req->desc_cnt = segs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1403) if (segs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1404) ubd_map_req(dev, io_req, req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1405)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1406) ret = os_write_file(thread_fd, &io_req, sizeof(io_req));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1407) if (ret != sizeof(io_req)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1408) if (ret != -EAGAIN)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1409) pr_err("write to io thread failed: %d\n", -ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1410) kfree(io_req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1411) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1412) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1413) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1414)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1415) static blk_status_t ubd_queue_rq(struct blk_mq_hw_ctx *hctx,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1416) const struct blk_mq_queue_data *bd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1417) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1418) struct ubd *ubd_dev = hctx->queue->queuedata;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1419) struct request *req = bd->rq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1420) int ret = 0, res = BLK_STS_OK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1421)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1422) blk_mq_start_request(req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1423)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1424) spin_lock_irq(&ubd_dev->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1425)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1426) switch (req_op(req)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1427) case REQ_OP_FLUSH:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1428) case REQ_OP_READ:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1429) case REQ_OP_WRITE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1430) case REQ_OP_DISCARD:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1431) case REQ_OP_WRITE_ZEROES:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1432) ret = ubd_submit_request(ubd_dev, req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1433) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1434) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1435) WARN_ON_ONCE(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1436) res = BLK_STS_NOTSUPP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1437) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1438)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1439) spin_unlock_irq(&ubd_dev->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1440)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1441) if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1442) if (ret == -ENOMEM)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1443) res = BLK_STS_RESOURCE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1444) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1445) res = BLK_STS_DEV_RESOURCE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1446) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1447)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1448) return res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1449) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1450)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1451) static int ubd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1452) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1453) struct ubd *ubd_dev = bdev->bd_disk->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1454)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1455) geo->heads = 128;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1456) geo->sectors = 32;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1457) geo->cylinders = ubd_dev->size / (128 * 32 * 512);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1458) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1459) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1460)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1461) static int ubd_ioctl(struct block_device *bdev, fmode_t mode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1462) unsigned int cmd, unsigned long arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1463) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1464) struct ubd *ubd_dev = bdev->bd_disk->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1465) u16 ubd_id[ATA_ID_WORDS];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1466)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1467) switch (cmd) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1468) struct cdrom_volctrl volume;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1469) case HDIO_GET_IDENTITY:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1470) memset(&ubd_id, 0, ATA_ID_WORDS * 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1471) ubd_id[ATA_ID_CYLS] = ubd_dev->size / (128 * 32 * 512);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1472) ubd_id[ATA_ID_HEADS] = 128;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1473) ubd_id[ATA_ID_SECTORS] = 32;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1474) if(copy_to_user((char __user *) arg, (char *) &ubd_id,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1475) sizeof(ubd_id)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1476) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1477) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1478)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1479) case CDROMVOLREAD:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1480) if(copy_from_user(&volume, (char __user *) arg, sizeof(volume)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1481) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1482) volume.channel0 = 255;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1483) volume.channel1 = 255;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1484) volume.channel2 = 255;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1485) volume.channel3 = 255;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1486) if(copy_to_user((char __user *) arg, &volume, sizeof(volume)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1487) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1488) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1489) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1490) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1491) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1492)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1493) static int map_error(int error_code)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1494) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1495) switch (error_code) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1496) case 0:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1497) return BLK_STS_OK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1498) case ENOSYS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1499) case EOPNOTSUPP:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1500) return BLK_STS_NOTSUPP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1501) case ENOSPC:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1502) return BLK_STS_NOSPC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1503) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1504) return BLK_STS_IOERR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1505) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1506)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1507) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1508) * Everything from here onwards *IS NOT PART OF THE KERNEL*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1509) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1510) * The following functions are part of UML hypervisor code.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1511) * All functions from here onwards are executed as a helper
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1512) * thread and are not allowed to execute any kernel functions.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1513) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1514) * Any communication must occur strictly via shared memory and IPC.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1515) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1516) * Do not add printks, locks, kernel memory operations, etc - it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1517) * will result in unpredictable behaviour and/or crashes.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1518) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1519)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1520) static int update_bitmap(struct io_thread_req *req, struct io_desc *segment)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1521) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1522) int n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1523)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1524) if (segment->cow_offset == -1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1525) return map_error(0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1526)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1527) n = os_pwrite_file(req->fds[1], &segment->bitmap_words,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1528) sizeof(segment->bitmap_words), segment->cow_offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1529) if (n != sizeof(segment->bitmap_words))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1530) return map_error(-n);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1531)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1532) return map_error(0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1533) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1534)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1535) static void do_io(struct io_thread_req *req, struct io_desc *desc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1536) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1537) char *buf = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1538) unsigned long len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1539) int n, nsectors, start, end, bit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1540) __u64 off;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1541)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1542) /* FLUSH is really a special case, we cannot "case" it with others */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1543)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1544) if (req_op(req->req) == REQ_OP_FLUSH) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1545) /* fds[0] is always either the rw image or our cow file */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1546) req->error = map_error(-os_sync_file(req->fds[0]));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1547) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1548) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1549)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1550) nsectors = desc->length / req->sectorsize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1551) start = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1552) do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1553) bit = ubd_test_bit(start, (unsigned char *) &desc->sector_mask);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1554) end = start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1555) while((end < nsectors) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1556) (ubd_test_bit(end, (unsigned char *) &desc->sector_mask) == bit))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1557) end++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1558)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1559) off = req->offset + req->offsets[bit] +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1560) start * req->sectorsize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1561) len = (end - start) * req->sectorsize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1562) if (desc->buffer != NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1563) buf = &desc->buffer[start * req->sectorsize];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1564)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1565) switch (req_op(req->req)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1566) case REQ_OP_READ:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1567) n = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1568) do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1569) buf = &buf[n];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1570) len -= n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1571) n = os_pread_file(req->fds[bit], buf, len, off);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1572) if (n < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1573) req->error = map_error(-n);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1574) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1575) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1576) } while((n < len) && (n != 0));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1577) if (n < len) memset(&buf[n], 0, len - n);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1578) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1579) case REQ_OP_WRITE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1580) n = os_pwrite_file(req->fds[bit], buf, len, off);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1581) if(n != len){
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1582) req->error = map_error(-n);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1583) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1584) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1585) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1586) case REQ_OP_DISCARD:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1587) case REQ_OP_WRITE_ZEROES:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1588) n = os_falloc_punch(req->fds[bit], off, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1589) if (n) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1590) req->error = map_error(-n);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1591) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1592) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1593) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1594) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1595) WARN_ON_ONCE(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1596) req->error = BLK_STS_NOTSUPP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1597) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1598) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1599)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1600) start = end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1601) } while(start < nsectors);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1602)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1603) req->offset += len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1604) req->error = update_bitmap(req, desc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1605) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1606)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1607) /* Changed in start_io_thread, which is serialized by being called only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1608) * from ubd_init, which is an initcall.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1609) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1610) int kernel_fd = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1611)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1612) /* Only changed by the io thread. XXX: currently unused. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1613) static int io_count = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1614)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1615) int io_thread(void *arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1616) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1617) int n, count, written, res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1618)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1619) os_fix_helper_signals();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1620)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1621) while(1){
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1622) n = bulk_req_safe_read(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1623) kernel_fd,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1624) io_req_buffer,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1625) &io_remainder,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1626) &io_remainder_size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1627) UBD_REQ_BUFFER_SIZE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1628) );
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1629) if (n <= 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1630) if (n == -EAGAIN)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1631) ubd_read_poll(-1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1632)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1633) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1634) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1635)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1636) for (count = 0; count < n/sizeof(struct io_thread_req *); count++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1637) struct io_thread_req *req = (*io_req_buffer)[count];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1638) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1639)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1640) io_count++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1641) for (i = 0; !req->error && i < req->desc_cnt; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1642) do_io(req, &(req->io_desc[i]));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1643)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1644) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1645)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1646) written = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1647)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1648) do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1649) res = os_write_file(kernel_fd,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1650) ((char *) io_req_buffer) + written,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1651) n - written);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1652) if (res >= 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1653) written += res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1654) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1655) if (written < n) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1656) ubd_write_poll(-1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1657) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1658) } while (written < n);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1659) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1660)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1661) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1662) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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