dbddf429dc514 (Alex Dewar 2019-08-25 10:49:16 +0100 1) // SPDX-License-Identifier: GPL-2.0
6c29256c5703a (Jeff Dike 2006-03-27 01:14:37 -0800 2) /*
a41421edb926f (Anton Ivanov 2018-11-14 18:41:08 +0000 3) * Copyright (C) 2018 Cambridge Greys Ltd
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 4) * Copyright (C) 2015-2016 Anton Ivanov (aivanov@brocade.com)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 5) * Copyright (C) 2000 Jeff Dike (jdike@karaya.com)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 6) */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 7)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 8) /* 2001-09-28...2002-04-17
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 9) * Partition stuff by James_McMechan@hotmail.com
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 10) * old style ubd by setting UBD_SHIFT to 0
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 11) * 2002-09-27...2002-10-18 massive tinkering for 2.5
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 12) * partitions have changed in 2.5
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 13) * 2003-01-29 more tinkering for 2.5.59-1
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 14) * This should now address the sysfs problems and has
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 15) * the symlink for devfs to allow for booting with
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 16) * the common /dev/ubd/discX/... names rather than
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 17) * only /dev/ubdN/discN this version also has lots of
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 18) * clean ups preparing for ubd-many.
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 19) * James McMechan
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 20) */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 21)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 22) #define UBD_SHIFT 4
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 23)
8ea3c06a2e4d9 (Al Viro 2011-08-18 18:04:41 -0400 24) #include <linux/module.h>
8ea3c06a2e4d9 (Al Viro 2011-08-18 18:04:41 -0400 25) #include <linux/init.h>
8ea3c06a2e4d9 (Al Viro 2011-08-18 18:04:41 -0400 26) #include <linux/blkdev.h>
4e6da0fe8058d (Richard Weinberger 2017-11-26 13:33:11 +0100 27) #include <linux/blk-mq.h>
8ea3c06a2e4d9 (Al Viro 2011-08-18 18:04:41 -0400 28) #include <linux/ata.h>
8ea3c06a2e4d9 (Al Viro 2011-08-18 18:04:41 -0400 29) #include <linux/hdreg.h>
8ea3c06a2e4d9 (Al Viro 2011-08-18 18:04:41 -0400 30) #include <linux/cdrom.h>
8ea3c06a2e4d9 (Al Viro 2011-08-18 18:04:41 -0400 31) #include <linux/proc_fs.h>
8ea3c06a2e4d9 (Al Viro 2011-08-18 18:04:41 -0400 32) #include <linux/seq_file.h>
8ea3c06a2e4d9 (Al Viro 2011-08-18 18:04:41 -0400 33) #include <linux/ctype.h>
8ea3c06a2e4d9 (Al Viro 2011-08-18 18:04:41 -0400 34) #include <linux/slab.h>
8ea3c06a2e4d9 (Al Viro 2011-08-18 18:04:41 -0400 35) #include <linux/vmalloc.h>
8ea3c06a2e4d9 (Al Viro 2011-08-18 18:04:41 -0400 36) #include <linux/platform_device.h>
8ea3c06a2e4d9 (Al Viro 2011-08-18 18:04:41 -0400 37) #include <linux/scatterlist.h>
8ea3c06a2e4d9 (Al Viro 2011-08-18 18:04:41 -0400 38) #include <asm/tlbflush.h>
37185b3324087 (Al Viro 2012-10-08 03:27:32 +0100 39) #include <kern_util.h>
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 40) #include "mconsole_kern.h"
37185b3324087 (Al Viro 2012-10-08 03:27:32 +0100 41) #include <init.h>
37185b3324087 (Al Viro 2012-10-08 03:27:32 +0100 42) #include <irq_kern.h>
8ea3c06a2e4d9 (Al Viro 2011-08-18 18:04:41 -0400 43) #include "ubd.h"
37185b3324087 (Al Viro 2012-10-08 03:27:32 +0100 44) #include <os.h>
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 45) #include "cow.h"
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 46)
a43c83161a5ec (Anton Ivanov 2018-11-14 18:41:06 +0000 47) /* Max request size is determined by sector mask - 32K */
a43c83161a5ec (Anton Ivanov 2018-11-14 18:41:06 +0000 48) #define UBD_MAX_REQUEST (8 * sizeof(long))
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 49)
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 50) struct io_desc {
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 51) char *buffer;
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 52) unsigned long length;
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 53) unsigned long sector_mask;
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 54) unsigned long long cow_offset;
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 55) unsigned long bitmap_words[2];
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 56) };
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 57)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 58) struct io_thread_req {
62f96cb01e8de (Jeff Dike 2007-02-10 01:44:16 -0800 59) struct request *req;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 60) int fds[2];
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 61) unsigned long offsets[2];
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 62) unsigned long long offset;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 63) int sectorsize;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 64) int error;
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 65)
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 66) int desc_cnt;
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 67) /* io_desc has to be the last element of the struct */
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 68) struct io_desc io_desc[];
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 69) };
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 70)
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 71)
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 72) static struct io_thread_req * (*irq_req_buffer)[];
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 73) static struct io_thread_req *irq_remainder;
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 74) static int irq_remainder_size;
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 75)
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 76) static struct io_thread_req * (*io_req_buffer)[];
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 77) static struct io_thread_req *io_remainder;
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 78) static int io_remainder_size;
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 79)
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 80)
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 81)
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 82) static inline int ubd_test_bit(__u64 bit, unsigned char *data)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 83) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 84) __u64 n;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 85) int bits, off;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 86)
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 87) bits = sizeof(data[0]) * 8;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 88) n = bit / bits;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 89) off = bit % bits;
dc764e5087bce (Jeff Dike 2007-05-06 14:51:41 -0700 90) return (data[n] & (1 << off)) != 0;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 91) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 92)
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 93) static inline void ubd_set_bit(__u64 bit, unsigned char *data)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 94) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 95) __u64 n;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 96) int bits, off;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 97)
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 98) bits = sizeof(data[0]) * 8;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 99) n = bit / bits;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 100) off = bit % bits;
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 101) data[n] |= (1 << off);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 102) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 103) /*End stuff from ubd_user.h*/
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 104)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 105) #define DRIVER_NAME "uml-blkdev"
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 106)
d7fb2c3865ca0 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:07 -0800 107) static DEFINE_MUTEX(ubd_lock);
9a181c5861713 (Arnd Bergmann 2010-09-11 18:38:03 +0200 108) static DEFINE_MUTEX(ubd_mutex); /* replaces BKL, might not be needed */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 109)
a625c998e638c (Al Viro 2008-03-02 09:16:26 -0500 110) static int ubd_open(struct block_device *bdev, fmode_t mode);
db2a144bedd58 (Al Viro 2013-05-05 21:52:57 -0400 111) static void ubd_release(struct gendisk *disk, fmode_t mode);
a625c998e638c (Al Viro 2008-03-02 09:16:26 -0500 112) static int ubd_ioctl(struct block_device *bdev, fmode_t mode,
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 113) unsigned int cmd, unsigned long arg);
a885c8c4316e1 (Christoph Hellwig 2006-01-08 01:02:50 -0800 114) static int ubd_getgeo(struct block_device *bdev, struct hd_geometry *geo);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 115)
97d88ac83540f (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:03 -0800 116) #define MAX_DEV (16)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 117)
83d5cde47dedf (Alexey Dobriyan 2009-09-21 17:01:13 -0700 118) static const struct block_device_operations ubd_blops = {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 119) .owner = THIS_MODULE,
a625c998e638c (Al Viro 2008-03-02 09:16:26 -0500 120) .open = ubd_open,
a625c998e638c (Al Viro 2008-03-02 09:16:26 -0500 121) .release = ubd_release,
a625c998e638c (Al Viro 2008-03-02 09:16:26 -0500 122) .ioctl = ubd_ioctl,
ab0cf1e425eaa (Arnd Bergmann 2019-11-30 20:09:07 +0100 123) .compat_ioctl = blkdev_compat_ptr_ioctl,
a885c8c4316e1 (Christoph Hellwig 2006-01-08 01:02:50 -0800 124) .getgeo = ubd_getgeo,
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 125) };
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 126)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 127) /* Protected by ubd_lock */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 128) static struct gendisk *ubd_gendisk[MAX_DEV];
6c29256c5703a (Jeff Dike 2006-03-27 01:14:37 -0800 129)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 130) #ifdef CONFIG_BLK_DEV_UBD_SYNC
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 131) #define OPEN_FLAGS ((struct openflags) { .r = 1, .w = 1, .s = 1, .c = 0, \
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 132) .cl = 1 })
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 133) #else
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 134) #define OPEN_FLAGS ((struct openflags) { .r = 1, .w = 1, .s = 0, .c = 0, \
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 135) .cl = 1 })
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 136) #endif
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 137) static struct openflags global_openflags = OPEN_FLAGS;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 138)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 139) struct cow {
2a9d32f682b2b (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:04 -0800 140) /* backing file name */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 141) char *file;
2a9d32f682b2b (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:04 -0800 142) /* backing file fd */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 143) int fd;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 144) unsigned long *bitmap;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 145) unsigned long bitmap_len;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 146) int bitmap_offset;
dc764e5087bce (Jeff Dike 2007-05-06 14:51:41 -0700 147) int data_offset;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 148) };
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 149)
a0044bdf60c21 (Jeff Dike 2007-05-06 14:51:36 -0700 150) #define MAX_SG 64
a0044bdf60c21 (Jeff Dike 2007-05-06 14:51:36 -0700 151)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 152) struct ubd {
2a9d32f682b2b (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:04 -0800 153) /* name (and fd, below) of the file opened for writing, either the
2a9d32f682b2b (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:04 -0800 154) * backing or the cow file. */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 155) char *file;
ef3ba87cb7c91 (Christopher Obbard 2020-11-23 18:31:37 +0000 156) char *serial;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 157) int count;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 158) int fd;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 159) __u64 size;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 160) struct openflags boot_openflags;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 161) struct openflags openflags;
84e945e399ce9 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:10 -0800 162) unsigned shared:1;
84e945e399ce9 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:10 -0800 163) unsigned no_cow:1;
50109b5a03b40 (Anton Ivanov 2018-11-14 18:41:09 +0000 164) unsigned no_trim:1;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 165) struct cow cow;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 166) struct platform_device pdev;
62f96cb01e8de (Jeff Dike 2007-02-10 01:44:16 -0800 167) struct request_queue *queue;
4e6da0fe8058d (Richard Weinberger 2017-11-26 13:33:11 +0100 168) struct blk_mq_tag_set tag_set;
62f96cb01e8de (Jeff Dike 2007-02-10 01:44:16 -0800 169) spinlock_t lock;
4e6da0fe8058d (Richard Weinberger 2017-11-26 13:33:11 +0100 170) };
4e6da0fe8058d (Richard Weinberger 2017-11-26 13:33:11 +0100 171)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 172) #define DEFAULT_COW { \
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 173) .file = NULL, \
dc764e5087bce (Jeff Dike 2007-05-06 14:51:41 -0700 174) .fd = -1, \
dc764e5087bce (Jeff Dike 2007-05-06 14:51:41 -0700 175) .bitmap = NULL, \
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 176) .bitmap_offset = 0, \
dc764e5087bce (Jeff Dike 2007-05-06 14:51:41 -0700 177) .data_offset = 0, \
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 178) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 179)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 180) #define DEFAULT_UBD { \
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 181) .file = NULL, \
ef3ba87cb7c91 (Christopher Obbard 2020-11-23 18:31:37 +0000 182) .serial = NULL, \
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 183) .count = 0, \
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 184) .fd = -1, \
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 185) .size = -1, \
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 186) .boot_openflags = OPEN_FLAGS, \
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 187) .openflags = OPEN_FLAGS, \
dc764e5087bce (Jeff Dike 2007-05-06 14:51:41 -0700 188) .no_cow = 0, \
50109b5a03b40 (Anton Ivanov 2018-11-14 18:41:09 +0000 189) .no_trim = 0, \
6c29256c5703a (Jeff Dike 2006-03-27 01:14:37 -0800 190) .shared = 0, \
dc764e5087bce (Jeff Dike 2007-05-06 14:51:41 -0700 191) .cow = DEFAULT_COW, \
22e6500458990 (Thomas Gleixner 2011-01-23 15:21:25 +0100 192) .lock = __SPIN_LOCK_UNLOCKED(ubd_devs.lock), \
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 193) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 194)
b8831a1d2c78c (Jeff Dike 2007-02-10 01:44:17 -0800 195) /* Protected by ubd_lock */
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 196) static struct ubd ubd_devs[MAX_DEV] = { [0 ... MAX_DEV - 1] = DEFAULT_UBD };
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 197)
4e6da0fe8058d (Richard Weinberger 2017-11-26 13:33:11 +0100 198) static blk_status_t ubd_queue_rq(struct blk_mq_hw_ctx *hctx,
4e6da0fe8058d (Richard Weinberger 2017-11-26 13:33:11 +0100 199) const struct blk_mq_queue_data *bd);
4e6da0fe8058d (Richard Weinberger 2017-11-26 13:33:11 +0100 200)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 201) static int fake_ide_setup(char *str)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 202) {
7eb90f7e90a85 (Christoph Hellwig 2021-06-14 08:07:58 +0200 203) pr_warn("The fake_ide option has been removed\n");
dc764e5087bce (Jeff Dike 2007-05-06 14:51:41 -0700 204) return 1;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 205) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 206) __setup("fake_ide", fake_ide_setup);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 207)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 208) __uml_help(fake_ide_setup,
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 209) "fake_ide\n"
7eb90f7e90a85 (Christoph Hellwig 2021-06-14 08:07:58 +0200 210) " Obsolete stub.\n\n"
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 211) );
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 212)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 213) static int parse_unit(char **ptr)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 214) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 215) char *str = *ptr, *end;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 216) int n = -1;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 217)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 218) if(isdigit(*str)) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 219) n = simple_strtoul(str, &end, 0);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 220) if(end == str)
dc764e5087bce (Jeff Dike 2007-05-06 14:51:41 -0700 221) return -1;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 222) *ptr = end;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 223) }
97d88ac83540f (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:03 -0800 224) else if (('a' <= *str) && (*str <= 'z')) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 225) n = *str - 'a';
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 226) str++;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 227) *ptr = str;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 228) }
dc764e5087bce (Jeff Dike 2007-05-06 14:51:41 -0700 229) return n;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 230) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 231)
d8d7c28ec0b50 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:12 -0800 232) /* If *index_out == -1 at exit, the passed option was a general one;
d8d7c28ec0b50 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:12 -0800 233) * otherwise, the str pointer is used (and owned) inside ubd_devs array, so it
d8d7c28ec0b50 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:12 -0800 234) * should not be freed on exit.
d8d7c28ec0b50 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:12 -0800 235) */
f28169d200017 (Jeff Dike 2007-02-10 01:43:53 -0800 236) static int ubd_setup_common(char *str, int *index_out, char **error_out)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 237) {
7d314e346d608 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:05 -0800 238) struct ubd *ubd_dev;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 239) struct openflags flags = global_openflags;
ef3ba87cb7c91 (Christopher Obbard 2020-11-23 18:31:37 +0000 240) char *file, *backing_file, *serial;
b8831a1d2c78c (Jeff Dike 2007-02-10 01:44:17 -0800 241) int n, err = 0, i;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 242)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 243) if(index_out) *index_out = -1;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 244) n = *str;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 245) if(n == '='){
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 246) str++;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 247) if(!strcmp(str, "sync")){
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 248) global_openflags = of_sync(global_openflags);
9ca55299f2ee0 (Daniel Walter 2019-04-02 10:43:32 +0200 249) return err;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 250) }
b8831a1d2c78c (Jeff Dike 2007-02-10 01:44:17 -0800 251)
7eb90f7e90a85 (Christoph Hellwig 2021-06-14 08:07:58 +0200 252) pr_warn("fake major not supported any more\n");
7eb90f7e90a85 (Christoph Hellwig 2021-06-14 08:07:58 +0200 253) return 0;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 254) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 255)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 256) n = parse_unit(&str);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 257) if(n < 0){
f28169d200017 (Jeff Dike 2007-02-10 01:43:53 -0800 258) *error_out = "Couldn't parse device number";
f28169d200017 (Jeff Dike 2007-02-10 01:43:53 -0800 259) return -EINVAL;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 260) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 261) if(n >= MAX_DEV){
f28169d200017 (Jeff Dike 2007-02-10 01:43:53 -0800 262) *error_out = "Device number out of range";
f28169d200017 (Jeff Dike 2007-02-10 01:43:53 -0800 263) return 1;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 264) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 265)
f28169d200017 (Jeff Dike 2007-02-10 01:43:53 -0800 266) err = -EBUSY;
d7fb2c3865ca0 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:07 -0800 267) mutex_lock(&ubd_lock);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 268)
7d314e346d608 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:05 -0800 269) ubd_dev = &ubd_devs[n];
7d314e346d608 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:05 -0800 270) if(ubd_dev->file != NULL){
f28169d200017 (Jeff Dike 2007-02-10 01:43:53 -0800 271) *error_out = "Device is already configured";
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 272) goto out;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 273) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 274)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 275) if (index_out)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 276) *index_out = n;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 277)
f28169d200017 (Jeff Dike 2007-02-10 01:43:53 -0800 278) err = -EINVAL;
50109b5a03b40 (Anton Ivanov 2018-11-14 18:41:09 +0000 279) for (i = 0; i < sizeof("rscdt="); i++) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 280) switch (*str) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 281) case 'r':
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 282) flags.w = 0;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 283) break;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 284) case 's':
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 285) flags.s = 1;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 286) break;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 287) case 'd':
7d314e346d608 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:05 -0800 288) ubd_dev->no_cow = 1;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 289) break;
6c29256c5703a (Jeff Dike 2006-03-27 01:14:37 -0800 290) case 'c':
7d314e346d608 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:05 -0800 291) ubd_dev->shared = 1;
6c29256c5703a (Jeff Dike 2006-03-27 01:14:37 -0800 292) break;
50109b5a03b40 (Anton Ivanov 2018-11-14 18:41:09 +0000 293) case 't':
50109b5a03b40 (Anton Ivanov 2018-11-14 18:41:09 +0000 294) ubd_dev->no_trim = 1;
50109b5a03b40 (Anton Ivanov 2018-11-14 18:41:09 +0000 295) break;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 296) case '=':
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 297) str++;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 298) goto break_loop;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 299) default:
f28169d200017 (Jeff Dike 2007-02-10 01:43:53 -0800 300) *error_out = "Expected '=' or flag letter "
50109b5a03b40 (Anton Ivanov 2018-11-14 18:41:09 +0000 301) "(r, s, c, t or d)";
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 302) goto out;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 303) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 304) str++;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 305) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 306)
f28169d200017 (Jeff Dike 2007-02-10 01:43:53 -0800 307) if (*str == '=')
f28169d200017 (Jeff Dike 2007-02-10 01:43:53 -0800 308) *error_out = "Too many flags specified";
f28169d200017 (Jeff Dike 2007-02-10 01:43:53 -0800 309) else
f28169d200017 (Jeff Dike 2007-02-10 01:43:53 -0800 310) *error_out = "Missing '='";
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 311) goto out;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 312)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 313) break_loop:
ef3ba87cb7c91 (Christopher Obbard 2020-11-23 18:31:37 +0000 314) file = strsep(&str, ",:");
ef3ba87cb7c91 (Christopher Obbard 2020-11-23 18:31:37 +0000 315) if (*file == '\0')
ef3ba87cb7c91 (Christopher Obbard 2020-11-23 18:31:37 +0000 316) file = NULL;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 317)
ef3ba87cb7c91 (Christopher Obbard 2020-11-23 18:31:37 +0000 318) backing_file = strsep(&str, ",:");
94c41b3a7c370 (Hajime Tazaki 2020-12-21 11:24:34 +0900 319) if (backing_file && *backing_file == '\0')
ef3ba87cb7c91 (Christopher Obbard 2020-11-23 18:31:37 +0000 320) backing_file = NULL;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 321)
ef3ba87cb7c91 (Christopher Obbard 2020-11-23 18:31:37 +0000 322) serial = strsep(&str, ",:");
94c41b3a7c370 (Hajime Tazaki 2020-12-21 11:24:34 +0900 323) if (serial && *serial == '\0')
ef3ba87cb7c91 (Christopher Obbard 2020-11-23 18:31:37 +0000 324) serial = NULL;
ef3ba87cb7c91 (Christopher Obbard 2020-11-23 18:31:37 +0000 325)
ef3ba87cb7c91 (Christopher Obbard 2020-11-23 18:31:37 +0000 326) if (backing_file && ubd_dev->no_cow) {
ef3ba87cb7c91 (Christopher Obbard 2020-11-23 18:31:37 +0000 327) *error_out = "Can't specify both 'd' and a cow file";
ef3ba87cb7c91 (Christopher Obbard 2020-11-23 18:31:37 +0000 328) goto out;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 329) }
ef3ba87cb7c91 (Christopher Obbard 2020-11-23 18:31:37 +0000 330)
f28169d200017 (Jeff Dike 2007-02-10 01:43:53 -0800 331) err = 0;
ef3ba87cb7c91 (Christopher Obbard 2020-11-23 18:31:37 +0000 332) ubd_dev->file = file;
7d314e346d608 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:05 -0800 333) ubd_dev->cow.file = backing_file;
ef3ba87cb7c91 (Christopher Obbard 2020-11-23 18:31:37 +0000 334) ubd_dev->serial = serial;
7d314e346d608 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:05 -0800 335) ubd_dev->boot_openflags = flags;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 336) out:
d7fb2c3865ca0 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:07 -0800 337) mutex_unlock(&ubd_lock);
f28169d200017 (Jeff Dike 2007-02-10 01:43:53 -0800 338) return err;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 339) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 340)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 341) static int ubd_setup(char *str)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 342) {
f28169d200017 (Jeff Dike 2007-02-10 01:43:53 -0800 343) char *error;
f28169d200017 (Jeff Dike 2007-02-10 01:43:53 -0800 344) int err;
f28169d200017 (Jeff Dike 2007-02-10 01:43:53 -0800 345)
f28169d200017 (Jeff Dike 2007-02-10 01:43:53 -0800 346) err = ubd_setup_common(str, NULL, &error);
f28169d200017 (Jeff Dike 2007-02-10 01:43:53 -0800 347) if(err)
f28169d200017 (Jeff Dike 2007-02-10 01:43:53 -0800 348) printk(KERN_ERR "Failed to initialize device with \"%s\" : "
f28169d200017 (Jeff Dike 2007-02-10 01:43:53 -0800 349) "%s\n", str, error);
f28169d200017 (Jeff Dike 2007-02-10 01:43:53 -0800 350) return 1;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 351) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 352)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 353) __setup("ubd", ubd_setup);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 354) __uml_help(ubd_setup,
ef3ba87cb7c91 (Christopher Obbard 2020-11-23 18:31:37 +0000 355) "ubd<n><flags>=<filename>[(:|,)<filename2>][(:|,)<serial>]\n"
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 356) " This is used to associate a device with a file in the underlying\n"
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 357) " filesystem. When specifying two filenames, the first one is the\n"
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 358) " COW name and the second is the backing file name. As separator you can\n"
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 359) " use either a ':' or a ',': the first one allows writing things like;\n"
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 360) " ubd0=~/Uml/root_cow:~/Uml/root_backing_file\n"
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 361) " while with a ',' the shell would not expand the 2nd '~'.\n"
f28169d200017 (Jeff Dike 2007-02-10 01:43:53 -0800 362) " When using only one filename, UML will detect whether to treat it like\n"
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 363) " a COW file or a backing file. To override this detection, add the 'd'\n"
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 364) " flag:\n"
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 365) " ubd0d=BackingFile\n"
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 366) " Usually, there is a filesystem in the file, but \n"
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 367) " that's not required. Swap devices containing swap files can be\n"
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 368) " specified like this. Also, a file which doesn't contain a\n"
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 369) " filesystem can have its contents read in the virtual \n"
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 370) " machine by running 'dd' on the device. <n> must be in the range\n"
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 371) " 0 to 7. Appending an 'r' to the number will cause that device\n"
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 372) " to be mounted read-only. For example ubd1r=./ext_fs. Appending\n"
20ede453af796 (Jeff Dike 2008-02-04 22:30:37 -0800 373) " an 's' will cause data to be written to disk on the host immediately.\n"
20ede453af796 (Jeff Dike 2008-02-04 22:30:37 -0800 374) " 'c' will cause the device to be treated as being shared between multiple\n"
20ede453af796 (Jeff Dike 2008-02-04 22:30:37 -0800 375) " UMLs and file locking will be turned off - this is appropriate for a\n"
20ede453af796 (Jeff Dike 2008-02-04 22:30:37 -0800 376) " cluster filesystem and inappropriate at almost all other times.\n\n"
50109b5a03b40 (Anton Ivanov 2018-11-14 18:41:09 +0000 377) " 't' will disable trim/discard support on the device (enabled by default).\n\n"
ef3ba87cb7c91 (Christopher Obbard 2020-11-23 18:31:37 +0000 378) " An optional device serial number can be exposed using the serial parameter\n"
ef3ba87cb7c91 (Christopher Obbard 2020-11-23 18:31:37 +0000 379) " on the cmdline which is exposed as a sysfs entry. This is particularly\n"
ef3ba87cb7c91 (Christopher Obbard 2020-11-23 18:31:37 +0000 380) " useful when a unique number should be given to the device. Note when\n"
ef3ba87cb7c91 (Christopher Obbard 2020-11-23 18:31:37 +0000 381) " specifying a label, the filename2 must be also presented. It can be\n"
ef3ba87cb7c91 (Christopher Obbard 2020-11-23 18:31:37 +0000 382) " an empty string, in which case the backing file is not used:\n"
ef3ba87cb7c91 (Christopher Obbard 2020-11-23 18:31:37 +0000 383) " ubd0=File,,Serial\n"
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 384) );
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 385)
8299ca5ce10c9 (Jeff Dike 2008-02-04 22:30:48 -0800 386) static int udb_setup(char *str)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 387) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 388) printk("udb%s specified on command line is almost certainly a ubd -> "
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 389) "udb TYPO\n", str);
dc764e5087bce (Jeff Dike 2007-05-06 14:51:41 -0700 390) return 1;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 391) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 392)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 393) __setup("udb", udb_setup);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 394) __uml_help(udb_setup,
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 395) "udb\n"
0894e27e7999b (Jeff Dike 2005-05-28 15:51:55 -0700 396) " This option is here solely to catch ubd -> udb typos, which can be\n"
0894e27e7999b (Jeff Dike 2005-05-28 15:51:55 -0700 397) " to impossible to catch visually unless you specifically look for\n"
0894e27e7999b (Jeff Dike 2005-05-28 15:51:55 -0700 398) " them. The only result of any option starting with 'udb' is an error\n"
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 399) " in the boot output.\n\n"
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 400) );
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 401)
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 402) /* Only changed by ubd_init, which is an initcall. */
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 403) static int thread_fd = -1;
a0044bdf60c21 (Jeff Dike 2007-05-06 14:51:36 -0700 404)
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 405) /* Function to read several request pointers at a time
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 406) * handling fractional reads if (and as) needed
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 407) */
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 408)
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 409) static int bulk_req_safe_read(
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 410) int fd,
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 411) struct io_thread_req * (*request_buffer)[],
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 412) struct io_thread_req **remainder,
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 413) int *remainder_size,
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 414) int max_recs
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 415) )
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 416) {
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 417) int n = 0;
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 418) int res = 0;
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 419)
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 420) if (*remainder_size > 0) {
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 421) memmove(
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 422) (char *) request_buffer,
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 423) (char *) remainder, *remainder_size
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 424) );
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 425) n = *remainder_size;
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 426) }
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 427)
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 428) res = os_read_file(
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 429) fd,
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 430) ((char *) request_buffer) + *remainder_size,
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 431) sizeof(struct io_thread_req *)*max_recs
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 432) - *remainder_size
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 433) );
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 434) if (res > 0) {
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 435) n += res;
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 436) if ((n % sizeof(struct io_thread_req *)) > 0) {
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 437) /*
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 438) * Read somehow returned not a multiple of dword
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 439) * theoretically possible, but never observed in the
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 440) * wild, so read routine must be able to handle it
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 441) */
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 442) *remainder_size = n % sizeof(struct io_thread_req *);
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 443) WARN(*remainder_size > 0, "UBD IPC read returned a partial result");
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 444) memmove(
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 445) remainder,
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 446) ((char *) request_buffer) +
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 447) (n/sizeof(struct io_thread_req *))*sizeof(struct io_thread_req *),
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 448) *remainder_size
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 449) );
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 450) n = n - *remainder_size;
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 451) }
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 452) } else {
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 453) n = res;
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 454) }
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 455) return n;
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 456) }
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 457)
62f96cb01e8de (Jeff Dike 2007-02-10 01:44:16 -0800 458) /* Called without dev->lock held, and only in interrupt context. */
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 459) static void ubd_handler(void)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 460) {
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 461) int n;
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 462) int count;
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 463)
a0044bdf60c21 (Jeff Dike 2007-05-06 14:51:36 -0700 464) while(1){
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 465) n = bulk_req_safe_read(
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 466) thread_fd,
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 467) irq_req_buffer,
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 468) &irq_remainder,
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 469) &irq_remainder_size,
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 470) UBD_REQ_BUFFER_SIZE
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 471) );
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 472) if (n < 0) {
a0044bdf60c21 (Jeff Dike 2007-05-06 14:51:36 -0700 473) if(n == -EAGAIN)
a0044bdf60c21 (Jeff Dike 2007-05-06 14:51:36 -0700 474) break;
a0044bdf60c21 (Jeff Dike 2007-05-06 14:51:36 -0700 475) printk(KERN_ERR "spurious interrupt in ubd_handler, "
a0044bdf60c21 (Jeff Dike 2007-05-06 14:51:36 -0700 476) "err = %d\n", -n);
a0044bdf60c21 (Jeff Dike 2007-05-06 14:51:36 -0700 477) return;
a0044bdf60c21 (Jeff Dike 2007-05-06 14:51:36 -0700 478) }
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 479) for (count = 0; count < n/sizeof(struct io_thread_req *); count++) {
4e6da0fe8058d (Richard Weinberger 2017-11-26 13:33:11 +0100 480) struct io_thread_req *io_req = (*irq_req_buffer)[count];
4e6da0fe8058d (Richard Weinberger 2017-11-26 13:33:11 +0100 481)
50109b5a03b40 (Anton Ivanov 2018-11-14 18:41:09 +0000 482) if ((io_req->error == BLK_STS_NOTSUPP) && (req_op(io_req->req) == REQ_OP_DISCARD)) {
50109b5a03b40 (Anton Ivanov 2018-11-14 18:41:09 +0000 483) blk_queue_max_discard_sectors(io_req->req->q, 0);
50109b5a03b40 (Anton Ivanov 2018-11-14 18:41:09 +0000 484) blk_queue_max_write_zeroes_sectors(io_req->req->q, 0);
50109b5a03b40 (Anton Ivanov 2018-11-14 18:41:09 +0000 485) blk_queue_flag_clear(QUEUE_FLAG_DISCARD, io_req->req->q);
50109b5a03b40 (Anton Ivanov 2018-11-14 18:41:09 +0000 486) }
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 487) blk_mq_end_request(io_req->req, io_req->error);
4e6da0fe8058d (Richard Weinberger 2017-11-26 13:33:11 +0100 488) kfree(io_req);
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 489) }
a0044bdf60c21 (Jeff Dike 2007-05-06 14:51:36 -0700 490) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 491) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 492)
7bea96fd22a8f (Al Viro 2006-10-08 22:49:34 +0100 493) static irqreturn_t ubd_intr(int irq, void *dev)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 494) {
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 495) ubd_handler();
dc764e5087bce (Jeff Dike 2007-05-06 14:51:41 -0700 496) return IRQ_HANDLED;
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 497) }
09ace81c1d737 (Jeff Dike 2005-09-03 15:57:46 -0700 498)
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 499) /* Only changed by ubd_init, which is an initcall. */
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 500) static int io_pid = -1;
09ace81c1d737 (Jeff Dike 2005-09-03 15:57:46 -0700 501)
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 502) static void kill_io_thread(void)
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 503) {
6c29256c5703a (Jeff Dike 2006-03-27 01:14:37 -0800 504) if(io_pid != -1)
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 505) os_kill_process(io_pid, 1);
09ace81c1d737 (Jeff Dike 2005-09-03 15:57:46 -0700 506) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 507)
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 508) __uml_exitcall(kill_io_thread);
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 509)
d8d7c28ec0b50 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:12 -0800 510) static inline int ubd_file_size(struct ubd *ubd_dev, __u64 *size_out)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 511) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 512) char *file;
8535639810e57 (Richard Weinberger 2011-11-02 13:17:27 +0100 513) int fd;
8535639810e57 (Richard Weinberger 2011-11-02 13:17:27 +0100 514) int err;
8535639810e57 (Richard Weinberger 2011-11-02 13:17:27 +0100 515)
8535639810e57 (Richard Weinberger 2011-11-02 13:17:27 +0100 516) __u32 version;
8535639810e57 (Richard Weinberger 2011-11-02 13:17:27 +0100 517) __u32 align;
8535639810e57 (Richard Weinberger 2011-11-02 13:17:27 +0100 518) char *backing_file;
853bc0ab341b0 (Arnd Bergmann 2019-11-05 09:39:51 +0100 519) time64_t mtime;
8535639810e57 (Richard Weinberger 2011-11-02 13:17:27 +0100 520) unsigned long long size;
8535639810e57 (Richard Weinberger 2011-11-02 13:17:27 +0100 521) int sector_size;
8535639810e57 (Richard Weinberger 2011-11-02 13:17:27 +0100 522) int bitmap_offset;
8535639810e57 (Richard Weinberger 2011-11-02 13:17:27 +0100 523)
8535639810e57 (Richard Weinberger 2011-11-02 13:17:27 +0100 524) if (ubd_dev->file && ubd_dev->cow.file) {
8535639810e57 (Richard Weinberger 2011-11-02 13:17:27 +0100 525) file = ubd_dev->cow.file;
8535639810e57 (Richard Weinberger 2011-11-02 13:17:27 +0100 526)
8535639810e57 (Richard Weinberger 2011-11-02 13:17:27 +0100 527) goto out;
8535639810e57 (Richard Weinberger 2011-11-02 13:17:27 +0100 528) }
8535639810e57 (Richard Weinberger 2011-11-02 13:17:27 +0100 529)
d4afcba95fca4 (Martin Pärtel 2012-08-02 00:44:22 +0200 530) fd = os_open_file(ubd_dev->file, of_read(OPENFLAGS()), 0);
8535639810e57 (Richard Weinberger 2011-11-02 13:17:27 +0100 531) if (fd < 0)
8535639810e57 (Richard Weinberger 2011-11-02 13:17:27 +0100 532) return fd;
8535639810e57 (Richard Weinberger 2011-11-02 13:17:27 +0100 533)
8535639810e57 (Richard Weinberger 2011-11-02 13:17:27 +0100 534) err = read_cow_header(file_reader, &fd, &version, &backing_file, \
8535639810e57 (Richard Weinberger 2011-11-02 13:17:27 +0100 535) &mtime, &size, §or_size, &align, &bitmap_offset);
8535639810e57 (Richard Weinberger 2011-11-02 13:17:27 +0100 536) os_close_file(fd);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 537)
8535639810e57 (Richard Weinberger 2011-11-02 13:17:27 +0100 538) if(err == -EINVAL)
8535639810e57 (Richard Weinberger 2011-11-02 13:17:27 +0100 539) file = ubd_dev->file;
8535639810e57 (Richard Weinberger 2011-11-02 13:17:27 +0100 540) else
8535639810e57 (Richard Weinberger 2011-11-02 13:17:27 +0100 541) file = backing_file;
8535639810e57 (Richard Weinberger 2011-11-02 13:17:27 +0100 542)
8535639810e57 (Richard Weinberger 2011-11-02 13:17:27 +0100 543) out:
dc764e5087bce (Jeff Dike 2007-05-06 14:51:41 -0700 544) return os_file_size(file, size_out);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 545) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 546)
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 547) static int read_cow_bitmap(int fd, void *buf, int offset, int len)
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 548) {
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 549) int err;
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 550)
8c6157b6b30a7 (Anton Ivanov 2015-12-21 18:54:00 +0000 551) err = os_pread_file(fd, buf, len, offset);
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 552) if (err < 0)
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 553) return err;
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 554)
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 555) return 0;
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 556) }
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 557)
853bc0ab341b0 (Arnd Bergmann 2019-11-05 09:39:51 +0100 558) static int backing_file_mismatch(char *file, __u64 size, time64_t mtime)
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 559) {
853bc0ab341b0 (Arnd Bergmann 2019-11-05 09:39:51 +0100 560) time64_t modtime;
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 561) unsigned long long actual;
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 562) int err;
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 563)
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 564) err = os_file_modtime(file, &modtime);
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 565) if (err < 0) {
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 566) printk(KERN_ERR "Failed to get modification time of backing "
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 567) "file \"%s\", err = %d\n", file, -err);
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 568) return err;
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 569) }
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 570)
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 571) err = os_file_size(file, &actual);
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 572) if (err < 0) {
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 573) printk(KERN_ERR "Failed to get size of backing file \"%s\", "
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 574) "err = %d\n", file, -err);
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 575) return err;
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 576) }
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 577)
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 578) if (actual != size) {
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 579) /*__u64 can be a long on AMD64 and with %lu GCC complains; so
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 580) * the typecast.*/
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 581) printk(KERN_ERR "Size mismatch (%llu vs %llu) of COW header "
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 582) "vs backing file\n", (unsigned long long) size, actual);
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 583) return -EINVAL;
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 584) }
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 585) if (modtime != mtime) {
853bc0ab341b0 (Arnd Bergmann 2019-11-05 09:39:51 +0100 586) printk(KERN_ERR "mtime mismatch (%lld vs %lld) of COW header vs "
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 587) "backing file\n", mtime, modtime);
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 588) return -EINVAL;
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 589) }
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 590) return 0;
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 591) }
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 592)
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 593) static int path_requires_switch(char *from_cmdline, char *from_cow, char *cow)
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 594) {
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 595) struct uml_stat buf1, buf2;
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 596) int err;
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 597)
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 598) if (from_cmdline == NULL)
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 599) return 0;
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 600) if (!strcmp(from_cmdline, from_cow))
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 601) return 0;
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 602)
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 603) err = os_stat_file(from_cmdline, &buf1);
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 604) if (err < 0) {
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 605) printk(KERN_ERR "Couldn't stat '%s', err = %d\n", from_cmdline,
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 606) -err);
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 607) return 0;
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 608) }
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 609) err = os_stat_file(from_cow, &buf2);
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 610) if (err < 0) {
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 611) printk(KERN_ERR "Couldn't stat '%s', err = %d\n", from_cow,
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 612) -err);
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 613) return 1;
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 614) }
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 615) if ((buf1.ust_dev == buf2.ust_dev) && (buf1.ust_ino == buf2.ust_ino))
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 616) return 0;
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 617)
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 618) printk(KERN_ERR "Backing file mismatch - \"%s\" requested, "
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 619) "\"%s\" specified in COW header of \"%s\"\n",
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 620) from_cmdline, from_cow, cow);
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 621) return 1;
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 622) }
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 623)
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 624) static int open_ubd_file(char *file, struct openflags *openflags, int shared,
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 625) char **backing_file_out, int *bitmap_offset_out,
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 626) unsigned long *bitmap_len_out, int *data_offset_out,
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 627) int *create_cow_out)
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 628) {
853bc0ab341b0 (Arnd Bergmann 2019-11-05 09:39:51 +0100 629) time64_t mtime;
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 630) unsigned long long size;
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 631) __u32 version, align;
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 632) char *backing_file;
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 633) int fd, err, sectorsize, asked_switch, mode = 0644;
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 634)
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 635) fd = os_open_file(file, *openflags, mode);
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 636) if (fd < 0) {
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 637) if ((fd == -ENOENT) && (create_cow_out != NULL))
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 638) *create_cow_out = 1;
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 639) if (!openflags->w ||
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 640) ((fd != -EROFS) && (fd != -EACCES)))
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 641) return fd;
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 642) openflags->w = 0;
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 643) fd = os_open_file(file, *openflags, mode);
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 644) if (fd < 0)
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 645) return fd;
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 646) }
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 647)
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 648) if (shared)
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 649) printk(KERN_INFO "Not locking \"%s\" on the host\n", file);
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 650) else {
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 651) err = os_lock_file(fd, openflags->w);
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 652) if (err < 0) {
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 653) printk(KERN_ERR "Failed to lock '%s', err = %d\n",
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 654) file, -err);
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 655) goto out_close;
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 656) }
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 657) }
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 658)
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 659) /* Successful return case! */
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 660) if (backing_file_out == NULL)
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 661) return fd;
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 662)
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 663) err = read_cow_header(file_reader, &fd, &version, &backing_file, &mtime,
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 664) &size, §orsize, &align, bitmap_offset_out);
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 665) if (err && (*backing_file_out != NULL)) {
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 666) printk(KERN_ERR "Failed to read COW header from COW file "
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 667) "\"%s\", errno = %d\n", file, -err);
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 668) goto out_close;
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 669) }
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 670) if (err)
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 671) return fd;
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 672)
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 673) asked_switch = path_requires_switch(*backing_file_out, backing_file,
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 674) file);
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 675)
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 676) /* Allow switching only if no mismatch. */
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 677) if (asked_switch && !backing_file_mismatch(*backing_file_out, size,
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 678) mtime)) {
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 679) printk(KERN_ERR "Switching backing file to '%s'\n",
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 680) *backing_file_out);
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 681) err = write_cow_header(file, fd, *backing_file_out,
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 682) sectorsize, align, &size);
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 683) if (err) {
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 684) printk(KERN_ERR "Switch failed, errno = %d\n", -err);
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 685) goto out_close;
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 686) }
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 687) } else {
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 688) *backing_file_out = backing_file;
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 689) err = backing_file_mismatch(*backing_file_out, size, mtime);
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 690) if (err)
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 691) goto out_close;
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 692) }
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 693)
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 694) cow_sizes(version, size, sectorsize, align, *bitmap_offset_out,
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 695) bitmap_len_out, data_offset_out);
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 696)
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 697) return fd;
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 698) out_close:
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 699) os_close_file(fd);
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 700) return err;
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 701) }
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 702)
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 703) static int create_cow_file(char *cow_file, char *backing_file,
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 704) struct openflags flags,
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 705) int sectorsize, int alignment, int *bitmap_offset_out,
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 706) unsigned long *bitmap_len_out, int *data_offset_out)
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 707) {
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 708) int err, fd;
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 709)
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 710) flags.c = 1;
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 711) fd = open_ubd_file(cow_file, &flags, 0, NULL, NULL, NULL, NULL, NULL);
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 712) if (fd < 0) {
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 713) err = fd;
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 714) printk(KERN_ERR "Open of COW file '%s' failed, errno = %d\n",
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 715) cow_file, -err);
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 716) goto out;
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 717) }
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 718)
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 719) err = init_cow_file(fd, cow_file, backing_file, sectorsize, alignment,
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 720) bitmap_offset_out, bitmap_len_out,
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 721) data_offset_out);
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 722) if (!err)
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 723) return fd;
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 724) os_close_file(fd);
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 725) out:
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 726) return err;
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 727) }
5dc62b1b64083 (WANG Cong 2008-04-28 02:13:58 -0700 728)
5f75a4f887a35 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:06 -0800 729) static void ubd_close_dev(struct ubd *ubd_dev)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 730) {
7d314e346d608 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:05 -0800 731) os_close_file(ubd_dev->fd);
7d314e346d608 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:05 -0800 732) if(ubd_dev->cow.file == NULL)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 733) return;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 734)
7d314e346d608 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:05 -0800 735) os_close_file(ubd_dev->cow.fd);
7d314e346d608 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:05 -0800 736) vfree(ubd_dev->cow.bitmap);
7d314e346d608 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:05 -0800 737) ubd_dev->cow.bitmap = NULL;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 738) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 739)
7d314e346d608 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:05 -0800 740) static int ubd_open_dev(struct ubd *ubd_dev)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 741) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 742) struct openflags flags;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 743) char **back_ptr;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 744) int err, create_cow, *create_ptr;
0bf16bffeef65 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:11 -0800 745) int fd;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 746)
7d314e346d608 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:05 -0800 747) ubd_dev->openflags = ubd_dev->boot_openflags;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 748) create_cow = 0;
7d314e346d608 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:05 -0800 749) create_ptr = (ubd_dev->cow.file != NULL) ? &create_cow : NULL;
7d314e346d608 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:05 -0800 750) back_ptr = ubd_dev->no_cow ? NULL : &ubd_dev->cow.file;
0bf16bffeef65 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:11 -0800 751)
0bf16bffeef65 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:11 -0800 752) fd = open_ubd_file(ubd_dev->file, &ubd_dev->openflags, ubd_dev->shared,
7d314e346d608 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:05 -0800 753) back_ptr, &ubd_dev->cow.bitmap_offset,
7d314e346d608 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:05 -0800 754) &ubd_dev->cow.bitmap_len, &ubd_dev->cow.data_offset,
6c29256c5703a (Jeff Dike 2006-03-27 01:14:37 -0800 755) create_ptr);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 756)
0bf16bffeef65 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:11 -0800 757) if((fd == -ENOENT) && create_cow){
0bf16bffeef65 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:11 -0800 758) fd = create_cow_file(ubd_dev->file, ubd_dev->cow.file,
a43c83161a5ec (Anton Ivanov 2018-11-14 18:41:06 +0000 759) ubd_dev->openflags, SECTOR_SIZE, PAGE_SIZE,
7d314e346d608 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:05 -0800 760) &ubd_dev->cow.bitmap_offset,
7d314e346d608 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:05 -0800 761) &ubd_dev->cow.bitmap_len,
7d314e346d608 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:05 -0800 762) &ubd_dev->cow.data_offset);
0bf16bffeef65 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:11 -0800 763) if(fd >= 0){
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 764) printk(KERN_INFO "Creating \"%s\" as COW file for "
7d314e346d608 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:05 -0800 765) "\"%s\"\n", ubd_dev->file, ubd_dev->cow.file);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 766) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 767) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 768)
0bf16bffeef65 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:11 -0800 769) if(fd < 0){
7d314e346d608 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:05 -0800 770) printk("Failed to open '%s', errno = %d\n", ubd_dev->file,
0bf16bffeef65 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:11 -0800 771) -fd);
0bf16bffeef65 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:11 -0800 772) return fd;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 773) }
0bf16bffeef65 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:11 -0800 774) ubd_dev->fd = fd;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 775)
7d314e346d608 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:05 -0800 776) if(ubd_dev->cow.file != NULL){
086fa5ff0854c (Martin K. Petersen 2010-02-26 00:20:38 -0500 777) blk_queue_max_hw_sectors(ubd_dev->queue, 8 * sizeof(long));
f4768ffd1d4b7 (Jeff Dike 2007-08-22 14:01:53 -0700 778)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 779) err = -ENOMEM;
da2486ba2c3e6 (Jesper Juhl 2007-10-16 01:27:19 -0700 780) ubd_dev->cow.bitmap = vmalloc(ubd_dev->cow.bitmap_len);
7d314e346d608 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:05 -0800 781) if(ubd_dev->cow.bitmap == NULL){
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 782) printk(KERN_ERR "Failed to vmalloc COW bitmap\n");
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 783) goto error;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 784) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 785) flush_tlb_kernel_vm();
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 786)
7d314e346d608 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:05 -0800 787) err = read_cow_bitmap(ubd_dev->fd, ubd_dev->cow.bitmap,
7d314e346d608 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:05 -0800 788) ubd_dev->cow.bitmap_offset,
7d314e346d608 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:05 -0800 789) ubd_dev->cow.bitmap_len);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 790) if(err < 0)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 791) goto error;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 792)
7d314e346d608 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:05 -0800 793) flags = ubd_dev->openflags;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 794) flags.w = 0;
7d314e346d608 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:05 -0800 795) err = open_ubd_file(ubd_dev->cow.file, &flags, ubd_dev->shared, NULL,
6c29256c5703a (Jeff Dike 2006-03-27 01:14:37 -0800 796) NULL, NULL, NULL, NULL);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 797) if(err < 0) goto error;
7d314e346d608 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:05 -0800 798) ubd_dev->cow.fd = err;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 799) }
50109b5a03b40 (Anton Ivanov 2018-11-14 18:41:09 +0000 800) if (ubd_dev->no_trim == 0) {
50109b5a03b40 (Anton Ivanov 2018-11-14 18:41:09 +0000 801) ubd_dev->queue->limits.discard_granularity = SECTOR_SIZE;
50109b5a03b40 (Anton Ivanov 2018-11-14 18:41:09 +0000 802) ubd_dev->queue->limits.discard_alignment = SECTOR_SIZE;
50109b5a03b40 (Anton Ivanov 2018-11-14 18:41:09 +0000 803) blk_queue_max_discard_sectors(ubd_dev->queue, UBD_MAX_REQUEST);
50109b5a03b40 (Anton Ivanov 2018-11-14 18:41:09 +0000 804) blk_queue_max_write_zeroes_sectors(ubd_dev->queue, UBD_MAX_REQUEST);
50109b5a03b40 (Anton Ivanov 2018-11-14 18:41:09 +0000 805) blk_queue_flag_set(QUEUE_FLAG_DISCARD, ubd_dev->queue);
50109b5a03b40 (Anton Ivanov 2018-11-14 18:41:09 +0000 806) }
a43c83161a5ec (Anton Ivanov 2018-11-14 18:41:06 +0000 807) blk_queue_flag_set(QUEUE_FLAG_NONROT, ubd_dev->queue);
dc764e5087bce (Jeff Dike 2007-05-06 14:51:41 -0700 808) return 0;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 809) error:
7d314e346d608 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:05 -0800 810) os_close_file(ubd_dev->fd);
dc764e5087bce (Jeff Dike 2007-05-06 14:51:41 -0700 811) return err;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 812) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 813)
2e3f5251ac716 (Jeff Dike 2007-05-06 14:51:29 -0700 814) static void ubd_device_release(struct device *dev)
2e3f5251ac716 (Jeff Dike 2007-05-06 14:51:29 -0700 815) {
8691b97b99d8b (Greg Kroah-Hartman 2009-05-04 12:40:54 -0700 816) struct ubd *ubd_dev = dev_get_drvdata(dev);
2e3f5251ac716 (Jeff Dike 2007-05-06 14:51:29 -0700 817)
4e6da0fe8058d (Richard Weinberger 2017-11-26 13:33:11 +0100 818) blk_mq_free_tag_set(&ubd_dev->tag_set);
2e3f5251ac716 (Jeff Dike 2007-05-06 14:51:29 -0700 819) *ubd_dev = ((struct ubd) DEFAULT_UBD);
2e3f5251ac716 (Jeff Dike 2007-05-06 14:51:29 -0700 820) }
2e3f5251ac716 (Jeff Dike 2007-05-06 14:51:29 -0700 821)
ef3ba87cb7c91 (Christopher Obbard 2020-11-23 18:31:37 +0000 822) static ssize_t serial_show(struct device *dev,
ef3ba87cb7c91 (Christopher Obbard 2020-11-23 18:31:37 +0000 823) struct device_attribute *attr, char *buf)
ef3ba87cb7c91 (Christopher Obbard 2020-11-23 18:31:37 +0000 824) {
ef3ba87cb7c91 (Christopher Obbard 2020-11-23 18:31:37 +0000 825) struct gendisk *disk = dev_to_disk(dev);
ef3ba87cb7c91 (Christopher Obbard 2020-11-23 18:31:37 +0000 826) struct ubd *ubd_dev = disk->private_data;
ef3ba87cb7c91 (Christopher Obbard 2020-11-23 18:31:37 +0000 827)
ef3ba87cb7c91 (Christopher Obbard 2020-11-23 18:31:37 +0000 828) if (!ubd_dev)
ef3ba87cb7c91 (Christopher Obbard 2020-11-23 18:31:37 +0000 829) return 0;
ef3ba87cb7c91 (Christopher Obbard 2020-11-23 18:31:37 +0000 830)
ef3ba87cb7c91 (Christopher Obbard 2020-11-23 18:31:37 +0000 831) return sprintf(buf, "%s", ubd_dev->serial);
ef3ba87cb7c91 (Christopher Obbard 2020-11-23 18:31:37 +0000 832) }
ef3ba87cb7c91 (Christopher Obbard 2020-11-23 18:31:37 +0000 833)
ef3ba87cb7c91 (Christopher Obbard 2020-11-23 18:31:37 +0000 834) static DEVICE_ATTR_RO(serial);
ef3ba87cb7c91 (Christopher Obbard 2020-11-23 18:31:37 +0000 835)
ef3ba87cb7c91 (Christopher Obbard 2020-11-23 18:31:37 +0000 836) static struct attribute *ubd_attrs[] = {
ef3ba87cb7c91 (Christopher Obbard 2020-11-23 18:31:37 +0000 837) &dev_attr_serial.attr,
ef3ba87cb7c91 (Christopher Obbard 2020-11-23 18:31:37 +0000 838) NULL,
ef3ba87cb7c91 (Christopher Obbard 2020-11-23 18:31:37 +0000 839) };
ef3ba87cb7c91 (Christopher Obbard 2020-11-23 18:31:37 +0000 840)
ef3ba87cb7c91 (Christopher Obbard 2020-11-23 18:31:37 +0000 841) static umode_t ubd_attrs_are_visible(struct kobject *kobj,
ef3ba87cb7c91 (Christopher Obbard 2020-11-23 18:31:37 +0000 842) struct attribute *a, int n)
ef3ba87cb7c91 (Christopher Obbard 2020-11-23 18:31:37 +0000 843) {
ef3ba87cb7c91 (Christopher Obbard 2020-11-23 18:31:37 +0000 844) return a->mode;
ef3ba87cb7c91 (Christopher Obbard 2020-11-23 18:31:37 +0000 845) }
ef3ba87cb7c91 (Christopher Obbard 2020-11-23 18:31:37 +0000 846)
ef3ba87cb7c91 (Christopher Obbard 2020-11-23 18:31:37 +0000 847) static const struct attribute_group ubd_attr_group = {
ef3ba87cb7c91 (Christopher Obbard 2020-11-23 18:31:37 +0000 848) .attrs = ubd_attrs,
ef3ba87cb7c91 (Christopher Obbard 2020-11-23 18:31:37 +0000 849) .is_visible = ubd_attrs_are_visible,
ef3ba87cb7c91 (Christopher Obbard 2020-11-23 18:31:37 +0000 850) };
ef3ba87cb7c91 (Christopher Obbard 2020-11-23 18:31:37 +0000 851)
ef3ba87cb7c91 (Christopher Obbard 2020-11-23 18:31:37 +0000 852) static const struct attribute_group *ubd_attr_groups[] = {
ef3ba87cb7c91 (Christopher Obbard 2020-11-23 18:31:37 +0000 853) &ubd_attr_group,
ef3ba87cb7c91 (Christopher Obbard 2020-11-23 18:31:37 +0000 854) NULL,
ef3ba87cb7c91 (Christopher Obbard 2020-11-23 18:31:37 +0000 855) };
ef3ba87cb7c91 (Christopher Obbard 2020-11-23 18:31:37 +0000 856)
35efb594c3a8b (Christoph Hellwig 2021-06-14 08:07:59 +0200 857) static void ubd_disk_register(int major, u64 size, int unit,
35efb594c3a8b (Christoph Hellwig 2021-06-14 08:07:59 +0200 858) struct gendisk *disk)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 859) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 860) disk->major = major;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 861) disk->first_minor = unit << UBD_SHIFT;
35efb594c3a8b (Christoph Hellwig 2021-06-14 08:07:59 +0200 862) disk->minors = 1 << UBD_SHIFT;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 863) disk->fops = &ubd_blops;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 864) set_capacity(disk, size / 512);
7eb90f7e90a85 (Christoph Hellwig 2021-06-14 08:07:58 +0200 865) sprintf(disk->disk_name, "ubd%c", 'a' + unit);
7eb90f7e90a85 (Christoph Hellwig 2021-06-14 08:07:58 +0200 866)
7eb90f7e90a85 (Christoph Hellwig 2021-06-14 08:07:58 +0200 867) ubd_devs[unit].pdev.id = unit;
7eb90f7e90a85 (Christoph Hellwig 2021-06-14 08:07:58 +0200 868) ubd_devs[unit].pdev.name = DRIVER_NAME;
7eb90f7e90a85 (Christoph Hellwig 2021-06-14 08:07:58 +0200 869) ubd_devs[unit].pdev.dev.release = ubd_device_release;
7eb90f7e90a85 (Christoph Hellwig 2021-06-14 08:07:58 +0200 870) dev_set_drvdata(&ubd_devs[unit].pdev.dev, &ubd_devs[unit]);
7eb90f7e90a85 (Christoph Hellwig 2021-06-14 08:07:58 +0200 871) platform_device_register(&ubd_devs[unit].pdev);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 872)
7d314e346d608 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:05 -0800 873) disk->private_data = &ubd_devs[unit];
62f96cb01e8de (Jeff Dike 2007-02-10 01:44:16 -0800 874) disk->queue = ubd_devs[unit].queue;
7eb90f7e90a85 (Christoph Hellwig 2021-06-14 08:07:58 +0200 875) device_add_disk(&ubd_devs[unit].pdev.dev, disk, ubd_attr_groups);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 876) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 877)
a43c83161a5ec (Anton Ivanov 2018-11-14 18:41:06 +0000 878) #define ROUND_BLOCK(n) ((n + (SECTOR_SIZE - 1)) & (-SECTOR_SIZE))
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 879)
4e6da0fe8058d (Richard Weinberger 2017-11-26 13:33:11 +0100 880) static const struct blk_mq_ops ubd_mq_ops = {
4e6da0fe8058d (Richard Weinberger 2017-11-26 13:33:11 +0100 881) .queue_rq = ubd_queue_rq,
4e6da0fe8058d (Richard Weinberger 2017-11-26 13:33:11 +0100 882) };
4e6da0fe8058d (Richard Weinberger 2017-11-26 13:33:11 +0100 883)
f28169d200017 (Jeff Dike 2007-02-10 01:43:53 -0800 884) static int ubd_add(int n, char **error_out)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 885) {
7d314e346d608 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:05 -0800 886) struct ubd *ubd_dev = &ubd_devs[n];
35efb594c3a8b (Christoph Hellwig 2021-06-14 08:07:59 +0200 887) struct gendisk *disk;
f28169d200017 (Jeff Dike 2007-02-10 01:43:53 -0800 888) int err = 0;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 889)
7d314e346d608 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:05 -0800 890) if(ubd_dev->file == NULL)
ec7cf783dd6cf (Jeff Dike 2005-09-03 15:57:29 -0700 891) goto out;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 892)
7d314e346d608 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:05 -0800 893) err = ubd_file_size(ubd_dev, &ubd_dev->size);
f28169d200017 (Jeff Dike 2007-02-10 01:43:53 -0800 894) if(err < 0){
f28169d200017 (Jeff Dike 2007-02-10 01:43:53 -0800 895) *error_out = "Couldn't determine size of device's file";
80c1374914028 (Jeff Dike 2006-09-29 01:58:51 -0700 896) goto out;
f28169d200017 (Jeff Dike 2007-02-10 01:43:53 -0800 897) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 898)
7d314e346d608 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:05 -0800 899) ubd_dev->size = ROUND_BLOCK(ubd_dev->size);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 900)
4e6da0fe8058d (Richard Weinberger 2017-11-26 13:33:11 +0100 901) ubd_dev->tag_set.ops = &ubd_mq_ops;
4e6da0fe8058d (Richard Weinberger 2017-11-26 13:33:11 +0100 902) ubd_dev->tag_set.queue_depth = 64;
4e6da0fe8058d (Richard Weinberger 2017-11-26 13:33:11 +0100 903) ubd_dev->tag_set.numa_node = NUMA_NO_NODE;
4e6da0fe8058d (Richard Weinberger 2017-11-26 13:33:11 +0100 904) ubd_dev->tag_set.flags = BLK_MQ_F_SHOULD_MERGE;
4e6da0fe8058d (Richard Weinberger 2017-11-26 13:33:11 +0100 905) ubd_dev->tag_set.driver_data = ubd_dev;
4e6da0fe8058d (Richard Weinberger 2017-11-26 13:33:11 +0100 906) ubd_dev->tag_set.nr_hw_queues = 1;
a0044bdf60c21 (Jeff Dike 2007-05-06 14:51:36 -0700 907)
4e6da0fe8058d (Richard Weinberger 2017-11-26 13:33:11 +0100 908) err = blk_mq_alloc_tag_set(&ubd_dev->tag_set);
4e6da0fe8058d (Richard Weinberger 2017-11-26 13:33:11 +0100 909) if (err)
80c1374914028 (Jeff Dike 2006-09-29 01:58:51 -0700 910) goto out;
4e6da0fe8058d (Richard Weinberger 2017-11-26 13:33:11 +0100 911)
35efb594c3a8b (Christoph Hellwig 2021-06-14 08:07:59 +0200 912) disk = blk_mq_alloc_disk(&ubd_dev->tag_set, ubd_dev);
35efb594c3a8b (Christoph Hellwig 2021-06-14 08:07:59 +0200 913) if (IS_ERR(disk)) {
35efb594c3a8b (Christoph Hellwig 2021-06-14 08:07:59 +0200 914) err = PTR_ERR(disk);
aea05eb56e470 (Anton Ivanov 2019-02-26 15:55:25 +0000 915) goto out_cleanup_tags;
62f96cb01e8de (Jeff Dike 2007-02-10 01:44:16 -0800 916) }
35efb594c3a8b (Christoph Hellwig 2021-06-14 08:07:59 +0200 917) ubd_dev->queue = disk->queue;
4e6da0fe8058d (Richard Weinberger 2017-11-26 13:33:11 +0100 918)
f935a8ce0a60a (Jens Axboe 2016-03-30 10:19:17 -0600 919) blk_queue_write_cache(ubd_dev->queue, true, false);
8a78362c4eefc (Martin K. Petersen 2010-02-26 00:20:39 -0500 920) blk_queue_max_segments(ubd_dev->queue, MAX_SG);
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 921) blk_queue_segment_boundary(ubd_dev->queue, PAGE_SIZE - 1);
35efb594c3a8b (Christoph Hellwig 2021-06-14 08:07:59 +0200 922) ubd_disk_register(UBD_MAJOR, ubd_dev->size, n, disk);
35efb594c3a8b (Christoph Hellwig 2021-06-14 08:07:59 +0200 923) ubd_gendisk[n] = disk;
35efb594c3a8b (Christoph Hellwig 2021-06-14 08:07:59 +0200 924) return 0;
62f96cb01e8de (Jeff Dike 2007-02-10 01:44:16 -0800 925)
4e6da0fe8058d (Richard Weinberger 2017-11-26 13:33:11 +0100 926) out_cleanup_tags:
4e6da0fe8058d (Richard Weinberger 2017-11-26 13:33:11 +0100 927) blk_mq_free_tag_set(&ubd_dev->tag_set);
35efb594c3a8b (Christoph Hellwig 2021-06-14 08:07:59 +0200 928) out:
35efb594c3a8b (Christoph Hellwig 2021-06-14 08:07:59 +0200 929) return err;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 930) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 931)
f28169d200017 (Jeff Dike 2007-02-10 01:43:53 -0800 932) static int ubd_config(char *str, char **error_out)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 933) {
e7f6552f23749 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:09 -0800 934) int n, ret;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 935)
f28169d200017 (Jeff Dike 2007-02-10 01:43:53 -0800 936) /* This string is possibly broken up and stored, so it's only
f28169d200017 (Jeff Dike 2007-02-10 01:43:53 -0800 937) * freed if ubd_setup_common fails, or if only general options
f28169d200017 (Jeff Dike 2007-02-10 01:43:53 -0800 938) * were set.
f28169d200017 (Jeff Dike 2007-02-10 01:43:53 -0800 939) */
970d6e3a3461e (Jeff Dike 2006-01-06 00:18:48 -0800 940) str = kstrdup(str, GFP_KERNEL);
e7f6552f23749 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:09 -0800 941) if (str == NULL) {
f28169d200017 (Jeff Dike 2007-02-10 01:43:53 -0800 942) *error_out = "Failed to allocate memory";
f28169d200017 (Jeff Dike 2007-02-10 01:43:53 -0800 943) return -ENOMEM;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 944) }
f28169d200017 (Jeff Dike 2007-02-10 01:43:53 -0800 945)
f28169d200017 (Jeff Dike 2007-02-10 01:43:53 -0800 946) ret = ubd_setup_common(str, &n, error_out);
f28169d200017 (Jeff Dike 2007-02-10 01:43:53 -0800 947) if (ret)
e7f6552f23749 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:09 -0800 948) goto err_free;
f28169d200017 (Jeff Dike 2007-02-10 01:43:53 -0800 949)
e7f6552f23749 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:09 -0800 950) if (n == -1) {
e7f6552f23749 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:09 -0800 951) ret = 0;
d8d7c28ec0b50 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:12 -0800 952) goto err_free;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 953) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 954)
dc764e5087bce (Jeff Dike 2007-05-06 14:51:41 -0700 955) mutex_lock(&ubd_lock);
f28169d200017 (Jeff Dike 2007-02-10 01:43:53 -0800 956) ret = ubd_add(n, error_out);
e7f6552f23749 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:09 -0800 957) if (ret)
7d314e346d608 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:05 -0800 958) ubd_devs[n].file = NULL;
dc764e5087bce (Jeff Dike 2007-05-06 14:51:41 -0700 959) mutex_unlock(&ubd_lock);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 960)
e7f6552f23749 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:09 -0800 961) out:
dc764e5087bce (Jeff Dike 2007-05-06 14:51:41 -0700 962) return ret;
e7f6552f23749 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:09 -0800 963)
e7f6552f23749 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:09 -0800 964) err_free:
e7f6552f23749 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:09 -0800 965) kfree(str);
e7f6552f23749 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:09 -0800 966) goto out;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 967) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 968)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 969) static int ubd_get_config(char *name, char *str, int size, char **error_out)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 970) {
7d314e346d608 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:05 -0800 971) struct ubd *ubd_dev;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 972) int n, len = 0;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 973)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 974) n = parse_unit(&name);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 975) if((n >= MAX_DEV) || (n < 0)){
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 976) *error_out = "ubd_get_config : device number out of range";
dc764e5087bce (Jeff Dike 2007-05-06 14:51:41 -0700 977) return -1;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 978) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 979)
7d314e346d608 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:05 -0800 980) ubd_dev = &ubd_devs[n];
d7fb2c3865ca0 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:07 -0800 981) mutex_lock(&ubd_lock);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 982)
7d314e346d608 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:05 -0800 983) if(ubd_dev->file == NULL){
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 984) CONFIG_CHUNK(str, size, len, "", 1);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 985) goto out;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 986) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 987)
7d314e346d608 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:05 -0800 988) CONFIG_CHUNK(str, size, len, ubd_dev->file, 0);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 989)
7d314e346d608 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:05 -0800 990) if(ubd_dev->cow.file != NULL){
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 991) CONFIG_CHUNK(str, size, len, ",", 0);
7d314e346d608 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:05 -0800 992) CONFIG_CHUNK(str, size, len, ubd_dev->cow.file, 1);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 993) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 994) else CONFIG_CHUNK(str, size, len, "", 1);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 995)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 996) out:
d7fb2c3865ca0 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:07 -0800 997) mutex_unlock(&ubd_lock);
dc764e5087bce (Jeff Dike 2007-05-06 14:51:41 -0700 998) return len;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 999) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1000)
29d56cfe3ca59 (Jeff Dike 2005-06-25 14:55:25 -0700 1001) static int ubd_id(char **str, int *start_out, int *end_out)
29d56cfe3ca59 (Jeff Dike 2005-06-25 14:55:25 -0700 1002) {
dc764e5087bce (Jeff Dike 2007-05-06 14:51:41 -0700 1003) int n;
29d56cfe3ca59 (Jeff Dike 2005-06-25 14:55:25 -0700 1004)
29d56cfe3ca59 (Jeff Dike 2005-06-25 14:55:25 -0700 1005) n = parse_unit(str);
dc764e5087bce (Jeff Dike 2007-05-06 14:51:41 -0700 1006) *start_out = 0;
dc764e5087bce (Jeff Dike 2007-05-06 14:51:41 -0700 1007) *end_out = MAX_DEV - 1;
dc764e5087bce (Jeff Dike 2007-05-06 14:51:41 -0700 1008) return n;
29d56cfe3ca59 (Jeff Dike 2005-06-25 14:55:25 -0700 1009) }
29d56cfe3ca59 (Jeff Dike 2005-06-25 14:55:25 -0700 1010)
f28169d200017 (Jeff Dike 2007-02-10 01:43:53 -0800 1011) static int ubd_remove(int n, char **error_out)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1012) {
2e3f5251ac716 (Jeff Dike 2007-05-06 14:51:29 -0700 1013) struct gendisk *disk = ubd_gendisk[n];
7d314e346d608 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:05 -0800 1014) struct ubd *ubd_dev;
29d56cfe3ca59 (Jeff Dike 2005-06-25 14:55:25 -0700 1015) int err = -ENODEV;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1016)
d7fb2c3865ca0 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:07 -0800 1017) mutex_lock(&ubd_lock);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1018)
7d314e346d608 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:05 -0800 1019) ubd_dev = &ubd_devs[n];
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1020)
7d314e346d608 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:05 -0800 1021) if(ubd_dev->file == NULL)
29d56cfe3ca59 (Jeff Dike 2005-06-25 14:55:25 -0700 1022) goto out;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1023)
29d56cfe3ca59 (Jeff Dike 2005-06-25 14:55:25 -0700 1024) /* you cannot remove a open disk */
29d56cfe3ca59 (Jeff Dike 2005-06-25 14:55:25 -0700 1025) err = -EBUSY;
7d314e346d608 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:05 -0800 1026) if(ubd_dev->count > 0)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1027) goto out;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1028)
dc764e5087bce (Jeff Dike 2007-05-06 14:51:41 -0700 1029) ubd_gendisk[n] = NULL;
b47d2debf2294 (Jeff Dike 2007-05-06 14:51:01 -0700 1030) if(disk != NULL){
b47d2debf2294 (Jeff Dike 2007-05-06 14:51:01 -0700 1031) del_gendisk(disk);
35efb594c3a8b (Christoph Hellwig 2021-06-14 08:07:59 +0200 1032) blk_cleanup_disk(disk);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1033) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1034)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1035) err = 0;
2e3f5251ac716 (Jeff Dike 2007-05-06 14:51:29 -0700 1036) platform_device_unregister(&ubd_dev->pdev);
29d56cfe3ca59 (Jeff Dike 2005-06-25 14:55:25 -0700 1037) out:
d7fb2c3865ca0 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:07 -0800 1038) mutex_unlock(&ubd_lock);
29d56cfe3ca59 (Jeff Dike 2005-06-25 14:55:25 -0700 1039) return err;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1040) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1041)
f28169d200017 (Jeff Dike 2007-02-10 01:43:53 -0800 1042) /* All these are called by mconsole in process context and without
b8831a1d2c78c (Jeff Dike 2007-02-10 01:44:17 -0800 1043) * ubd-specific locks. The structure itself is const except for .list.
f28169d200017 (Jeff Dike 2007-02-10 01:43:53 -0800 1044) */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1045) static struct mc_device ubd_mc = {
84f48d4f2b511 (Jeff Dike 2007-02-10 01:44:01 -0800 1046) .list = LIST_HEAD_INIT(ubd_mc.list),
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1047) .name = "ubd",
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1048) .config = ubd_config,
dc764e5087bce (Jeff Dike 2007-05-06 14:51:41 -0700 1049) .get_config = ubd_get_config,
29d56cfe3ca59 (Jeff Dike 2005-06-25 14:55:25 -0700 1050) .id = ubd_id,
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1051) .remove = ubd_remove,
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1052) };
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1053)
d8d7c28ec0b50 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:12 -0800 1054) static int __init ubd_mc_init(void)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1055) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1056) mconsole_register_dev(&ubd_mc);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1057) return 0;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1058) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1059)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1060) __initcall(ubd_mc_init);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1061)
d8d7c28ec0b50 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:12 -0800 1062) static int __init ubd0_init(void)
d8d7c28ec0b50 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:12 -0800 1063) {
d8d7c28ec0b50 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:12 -0800 1064) struct ubd *ubd_dev = &ubd_devs[0];
d8d7c28ec0b50 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:12 -0800 1065)
b8831a1d2c78c (Jeff Dike 2007-02-10 01:44:17 -0800 1066) mutex_lock(&ubd_lock);
d8d7c28ec0b50 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:12 -0800 1067) if(ubd_dev->file == NULL)
d8d7c28ec0b50 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:12 -0800 1068) ubd_dev->file = "root_fs";
b8831a1d2c78c (Jeff Dike 2007-02-10 01:44:17 -0800 1069) mutex_unlock(&ubd_lock);
b8831a1d2c78c (Jeff Dike 2007-02-10 01:44:17 -0800 1070)
dc764e5087bce (Jeff Dike 2007-05-06 14:51:41 -0700 1071) return 0;
d8d7c28ec0b50 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:12 -0800 1072) }
d8d7c28ec0b50 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:12 -0800 1073)
d8d7c28ec0b50 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:12 -0800 1074) __initcall(ubd0_init);
d8d7c28ec0b50 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:12 -0800 1075)
b8831a1d2c78c (Jeff Dike 2007-02-10 01:44:17 -0800 1076) /* Used in ubd_init, which is an initcall */
3ae5eaec1d2d9 (Russell King 2005-11-09 22:32:44 +0000 1077) static struct platform_driver ubd_driver = {
3ae5eaec1d2d9 (Russell King 2005-11-09 22:32:44 +0000 1078) .driver = {
3ae5eaec1d2d9 (Russell King 2005-11-09 22:32:44 +0000 1079) .name = DRIVER_NAME,
3ae5eaec1d2d9 (Russell King 2005-11-09 22:32:44 +0000 1080) },
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1081) };
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1082)
d8d7c28ec0b50 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:12 -0800 1083) static int __init ubd_init(void)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1084) {
f28169d200017 (Jeff Dike 2007-02-10 01:43:53 -0800 1085) char *error;
f28169d200017 (Jeff Dike 2007-02-10 01:43:53 -0800 1086) int i, err;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1087)
792dd4fc317e1 (Christoph Hellwig 2009-03-31 15:23:39 -0700 1088) if (register_blkdev(UBD_MAJOR, "ubd"))
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1089) return -1;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1090)
6da2ec56059c3 (Kees Cook 2018-06-12 13:55:00 -0700 1091) irq_req_buffer = kmalloc_array(UBD_REQ_BUFFER_SIZE,
6da2ec56059c3 (Kees Cook 2018-06-12 13:55:00 -0700 1092) sizeof(struct io_thread_req *),
6da2ec56059c3 (Kees Cook 2018-06-12 13:55:00 -0700 1093) GFP_KERNEL
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 1094) );
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 1095) irq_remainder = 0;
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 1096)
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 1097) if (irq_req_buffer == NULL) {
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 1098) printk(KERN_ERR "Failed to initialize ubd buffering\n");
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 1099) return -1;
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 1100) }
6da2ec56059c3 (Kees Cook 2018-06-12 13:55:00 -0700 1101) io_req_buffer = kmalloc_array(UBD_REQ_BUFFER_SIZE,
6da2ec56059c3 (Kees Cook 2018-06-12 13:55:00 -0700 1102) sizeof(struct io_thread_req *),
6da2ec56059c3 (Kees Cook 2018-06-12 13:55:00 -0700 1103) GFP_KERNEL
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 1104) );
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 1105)
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 1106) io_remainder = 0;
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 1107)
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 1108) if (io_req_buffer == NULL) {
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 1109) printk(KERN_ERR "Failed to initialize ubd buffering\n");
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 1110) return -1;
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 1111) }
3ae5eaec1d2d9 (Russell King 2005-11-09 22:32:44 +0000 1112) platform_driver_register(&ubd_driver);
dc764e5087bce (Jeff Dike 2007-05-06 14:51:41 -0700 1113) mutex_lock(&ubd_lock);
f28169d200017 (Jeff Dike 2007-02-10 01:43:53 -0800 1114) for (i = 0; i < MAX_DEV; i++){
f28169d200017 (Jeff Dike 2007-02-10 01:43:53 -0800 1115) err = ubd_add(i, &error);
f28169d200017 (Jeff Dike 2007-02-10 01:43:53 -0800 1116) if(err)
f28169d200017 (Jeff Dike 2007-02-10 01:43:53 -0800 1117) printk(KERN_ERR "Failed to initialize ubd device %d :"
f28169d200017 (Jeff Dike 2007-02-10 01:43:53 -0800 1118) "%s\n", i, error);
f28169d200017 (Jeff Dike 2007-02-10 01:43:53 -0800 1119) }
dc764e5087bce (Jeff Dike 2007-05-06 14:51:41 -0700 1120) mutex_unlock(&ubd_lock);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1121) return 0;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1122) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1123)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1124) late_initcall(ubd_init);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1125)
d8d7c28ec0b50 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:12 -0800 1126) static int __init ubd_driver_init(void){
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1127) unsigned long stack;
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1128) int err;
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1129)
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1130) /* Set by CONFIG_BLK_DEV_UBD_SYNC or ubd=sync.*/
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1131) if(global_openflags.s){
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1132) printk(KERN_INFO "ubd: Synchronous mode\n");
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1133) /* Letting ubd=sync be like using ubd#s= instead of ubd#= is
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1134) * enough. So use anyway the io thread. */
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1135) }
2fcb4090cd735 (Johannes Berg 2021-01-10 19:05:08 +0100 1136) stack = alloc_stack(0, 0);
558f9b2f94dbd (YiFei Zhu 2021-04-20 00:56:10 -0500 1137) io_pid = start_io_thread(stack + PAGE_SIZE, &thread_fd);
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1138) if(io_pid < 0){
6c29256c5703a (Jeff Dike 2006-03-27 01:14:37 -0800 1139) printk(KERN_ERR
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1140) "ubd : Failed to start I/O thread (errno = %d) - "
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1141) "falling back to synchronous I/O\n", -io_pid);
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1142) io_pid = -1;
dc764e5087bce (Jeff Dike 2007-05-06 14:51:41 -0700 1143) return 0;
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1144) }
6c29256c5703a (Jeff Dike 2006-03-27 01:14:37 -0800 1145) err = um_request_irq(UBD_IRQ, thread_fd, IRQ_READ, ubd_intr,
c0b79a90b1556 (Yong Zhang 2011-09-22 16:58:46 +0800 1146) 0, "ubd", ubd_devs);
36d46a5907ba1 (Johannes Berg 2020-12-02 12:59:50 +0100 1147) if(err < 0)
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1148) printk(KERN_ERR "um_request_irq failed - errno = %d\n", -err);
f4c57a78e2c49 (Jeff Dike 2006-03-31 02:30:10 -0800 1149) return 0;
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1150) }
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1151)
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1152) device_initcall(ubd_driver_init);
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1153)
a625c998e638c (Al Viro 2008-03-02 09:16:26 -0500 1154) static int ubd_open(struct block_device *bdev, fmode_t mode)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1155) {
a625c998e638c (Al Viro 2008-03-02 09:16:26 -0500 1156) struct gendisk *disk = bdev->bd_disk;
7d314e346d608 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:05 -0800 1157) struct ubd *ubd_dev = disk->private_data;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1158) int err = 0;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1159)
9a181c5861713 (Arnd Bergmann 2010-09-11 18:38:03 +0200 1160) mutex_lock(&ubd_mutex);
7d314e346d608 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:05 -0800 1161) if(ubd_dev->count == 0){
7d314e346d608 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:05 -0800 1162) err = ubd_open_dev(ubd_dev);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1163) if(err){
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1164) printk(KERN_ERR "%s: Can't open \"%s\": errno = %d\n",
7d314e346d608 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:05 -0800 1165) disk->disk_name, ubd_dev->file, -err);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1166) goto out;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1167) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1168) }
7d314e346d608 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:05 -0800 1169) ubd_dev->count++;
7d314e346d608 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:05 -0800 1170) set_disk_ro(disk, !ubd_dev->openflags.w);
2c49be99ede1e (Paolo 'Blaisorblade' Giarrusso 2005-05-01 08:58:57 -0700 1171)
2c49be99ede1e (Paolo 'Blaisorblade' Giarrusso 2005-05-01 08:58:57 -0700 1172) /* This should no more be needed. And it didn't work anyway to exclude
2c49be99ede1e (Paolo 'Blaisorblade' Giarrusso 2005-05-01 08:58:57 -0700 1173) * read-write remounting of filesystems.*/
a625c998e638c (Al Viro 2008-03-02 09:16:26 -0500 1174) /*if((mode & FMODE_WRITE) && !ubd_dev->openflags.w){
5f75a4f887a35 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:06 -0800 1175) if(--ubd_dev->count == 0) ubd_close_dev(ubd_dev);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1176) err = -EROFS;
2c49be99ede1e (Paolo 'Blaisorblade' Giarrusso 2005-05-01 08:58:57 -0700 1177) }*/
6e9624b8caec2 (Arnd Bergmann 2010-08-07 18:25:34 +0200 1178) out:
9a181c5861713 (Arnd Bergmann 2010-09-11 18:38:03 +0200 1179) mutex_unlock(&ubd_mutex);
dc764e5087bce (Jeff Dike 2007-05-06 14:51:41 -0700 1180) return err;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1181) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1182)
db2a144bedd58 (Al Viro 2013-05-05 21:52:57 -0400 1183) static void ubd_release(struct gendisk *disk, fmode_t mode)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1184) {
7d314e346d608 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:05 -0800 1185) struct ubd *ubd_dev = disk->private_data;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1186)
9a181c5861713 (Arnd Bergmann 2010-09-11 18:38:03 +0200 1187) mutex_lock(&ubd_mutex);
7d314e346d608 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:05 -0800 1188) if(--ubd_dev->count == 0)
5f75a4f887a35 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:06 -0800 1189) ubd_close_dev(ubd_dev);
9a181c5861713 (Arnd Bergmann 2010-09-11 18:38:03 +0200 1190) mutex_unlock(&ubd_mutex);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1191) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1192)
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1193) static void cowify_bitmap(__u64 io_offset, int length, unsigned long *cow_mask,
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1194) __u64 *cow_offset, unsigned long *bitmap,
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1195) __u64 bitmap_offset, unsigned long *bitmap_words,
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1196) __u64 bitmap_len)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1197) {
a43c83161a5ec (Anton Ivanov 2018-11-14 18:41:06 +0000 1198) __u64 sector = io_offset >> SECTOR_SHIFT;
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1199) int i, update_bitmap = 0;
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1200)
a43c83161a5ec (Anton Ivanov 2018-11-14 18:41:06 +0000 1201) for (i = 0; i < length >> SECTOR_SHIFT; i++) {
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1202) if(cow_mask != NULL)
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1203) ubd_set_bit(i, (unsigned char *) cow_mask);
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1204) if(ubd_test_bit(sector + i, (unsigned char *) bitmap))
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1205) continue;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1206)
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1207) update_bitmap = 1;
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1208) ubd_set_bit(sector + i, (unsigned char *) bitmap);
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1209) }
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1210)
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1211) if(!update_bitmap)
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1212) return;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1213)
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1214) *cow_offset = sector / (sizeof(unsigned long) * 8);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1215)
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1216) /* This takes care of the case where we're exactly at the end of the
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1217) * device, and *cow_offset + 1 is off the end. So, just back it up
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1218) * by one word. Thanks to Lynn Kerby for the fix and James McMechan
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1219) * for the original diagnosis.
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1220) */
6d0742426c9ad (Jiri Olsa 2008-05-12 14:01:56 -0700 1221) if (*cow_offset == (DIV_ROUND_UP(bitmap_len,
6d0742426c9ad (Jiri Olsa 2008-05-12 14:01:56 -0700 1222) sizeof(unsigned long)) - 1))
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1223) (*cow_offset)--;
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1224)
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1225) bitmap_words[0] = bitmap[*cow_offset];
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1226) bitmap_words[1] = bitmap[*cow_offset + 1];
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1227)
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1228) *cow_offset *= sizeof(unsigned long);
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1229) *cow_offset += bitmap_offset;
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1230) }
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1231)
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1232) static void cowify_req(struct io_thread_req *req, struct io_desc *segment,
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1233) unsigned long offset, unsigned long *bitmap,
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1234) __u64 bitmap_offset, __u64 bitmap_len)
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1235) {
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1236) __u64 sector = offset >> SECTOR_SHIFT;
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1237) int i;
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1238)
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1239) if (segment->length > (sizeof(segment->sector_mask) * 8) << SECTOR_SHIFT)
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1240) panic("Operation too long");
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1241)
a43c83161a5ec (Anton Ivanov 2018-11-14 18:41:06 +0000 1242) if (req_op(req->req) == REQ_OP_READ) {
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1243) for (i = 0; i < segment->length >> SECTOR_SHIFT; i++) {
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1244) if(ubd_test_bit(sector + i, (unsigned char *) bitmap))
6c29256c5703a (Jeff Dike 2006-03-27 01:14:37 -0800 1245) ubd_set_bit(i, (unsigned char *)
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1246) &segment->sector_mask);
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1247) }
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1248) } else {
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1249) cowify_bitmap(offset, segment->length, &segment->sector_mask,
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1250) &segment->cow_offset, bitmap, bitmap_offset,
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1251) segment->bitmap_words, bitmap_len);
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1252) }
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1253) }
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1254)
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1255) static void ubd_map_req(struct ubd *dev, struct io_thread_req *io_req,
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1256) struct request *req)
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1257) {
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1258) struct bio_vec bvec;
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1259) struct req_iterator iter;
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1260) int i = 0;
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1261) unsigned long byte_offset = io_req->offset;
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1262) int op = req_op(req);
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1263)
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1264) if (op == REQ_OP_WRITE_ZEROES || op == REQ_OP_DISCARD) {
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1265) io_req->io_desc[0].buffer = NULL;
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1266) io_req->io_desc[0].length = blk_rq_bytes(req);
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1267) } else {
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1268) rq_for_each_segment(bvec, req, iter) {
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1269) BUG_ON(i >= io_req->desc_cnt);
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1270)
25d84545beaae (Christoph Hellwig 2021-08-04 11:56:30 +0200 1271) io_req->io_desc[i].buffer = bvec_virt(&bvec);
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1272) io_req->io_desc[i].length = bvec.bv_len;
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1273) i++;
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1274) }
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1275) }
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1276)
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1277) if (dev->cow.file) {
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1278) for (i = 0; i < io_req->desc_cnt; i++) {
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1279) cowify_req(io_req, &io_req->io_desc[i], byte_offset,
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1280) dev->cow.bitmap, dev->cow.bitmap_offset,
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1281) dev->cow.bitmap_len);
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1282) byte_offset += io_req->io_desc[i].length;
dc764e5087bce (Jeff Dike 2007-05-06 14:51:41 -0700 1283) }
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1284)
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1285) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1286) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1287)
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1288) static struct io_thread_req *ubd_alloc_req(struct ubd *dev, struct request *req,
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1289) int desc_cnt)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1290) {
ecb0a83e3198f (Christoph Hellwig 2018-10-18 22:55:03 +0200 1291) struct io_thread_req *io_req;
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1292) int i;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1293)
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1294) io_req = kmalloc(sizeof(*io_req) +
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1295) (desc_cnt * sizeof(struct io_desc)),
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1296) GFP_ATOMIC);
ecb0a83e3198f (Christoph Hellwig 2018-10-18 22:55:03 +0200 1297) if (!io_req)
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1298) return NULL;
805f11a0d5156 (Richard Weinberger 2013-08-18 13:30:06 +0200 1299)
805f11a0d5156 (Richard Weinberger 2013-08-18 13:30:06 +0200 1300) io_req->req = req;
ecb0a83e3198f (Christoph Hellwig 2018-10-18 22:55:03 +0200 1301) if (dev->cow.file)
ecb0a83e3198f (Christoph Hellwig 2018-10-18 22:55:03 +0200 1302) io_req->fds[0] = dev->cow.fd;
ecb0a83e3198f (Christoph Hellwig 2018-10-18 22:55:03 +0200 1303) else
ecb0a83e3198f (Christoph Hellwig 2018-10-18 22:55:03 +0200 1304) io_req->fds[0] = dev->fd;
0033dfd92a564 (Anton Ivanov 2018-11-08 13:07:23 +0000 1305) io_req->error = 0;
53766defb8c86 (Anton Ivanov 2018-11-14 18:41:07 +0000 1306) io_req->sectorsize = SECTOR_SIZE;
53766defb8c86 (Anton Ivanov 2018-11-14 18:41:07 +0000 1307) io_req->fds[1] = dev->fd;
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1308) io_req->offset = (u64) blk_rq_pos(req) << SECTOR_SHIFT;
53766defb8c86 (Anton Ivanov 2018-11-14 18:41:07 +0000 1309) io_req->offsets[0] = 0;
53766defb8c86 (Anton Ivanov 2018-11-14 18:41:07 +0000 1310) io_req->offsets[1] = dev->cow.data_offset;
53766defb8c86 (Anton Ivanov 2018-11-14 18:41:07 +0000 1311)
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1312) for (i = 0 ; i < desc_cnt; i++) {
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1313) io_req->io_desc[i].sector_mask = 0;
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1314) io_req->io_desc[i].cow_offset = -1;
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1315) }
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1316)
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1317) return io_req;
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1318) }
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1319)
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1320) static int ubd_submit_request(struct ubd *dev, struct request *req)
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1321) {
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1322) int segs = 0;
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1323) struct io_thread_req *io_req;
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1324) int ret;
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1325) int op = req_op(req);
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1326)
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1327) if (op == REQ_OP_FLUSH)
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1328) segs = 0;
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1329) else if (op == REQ_OP_WRITE_ZEROES || op == REQ_OP_DISCARD)
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1330) segs = 1;
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1331) else
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1332) segs = blk_rq_nr_phys_segments(req);
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1333)
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1334) io_req = ubd_alloc_req(dev, req, segs);
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1335) if (!io_req)
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1336) return -ENOMEM;
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1337)
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1338) io_req->desc_cnt = segs;
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1339) if (segs)
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1340) ubd_map_req(dev, io_req, req);
53766defb8c86 (Anton Ivanov 2018-11-14 18:41:07 +0000 1341)
ecb0a83e3198f (Christoph Hellwig 2018-10-18 22:55:03 +0200 1342) ret = os_write_file(thread_fd, &io_req, sizeof(io_req));
ecb0a83e3198f (Christoph Hellwig 2018-10-18 22:55:03 +0200 1343) if (ret != sizeof(io_req)) {
ecb0a83e3198f (Christoph Hellwig 2018-10-18 22:55:03 +0200 1344) if (ret != -EAGAIN)
ecb0a83e3198f (Christoph Hellwig 2018-10-18 22:55:03 +0200 1345) pr_err("write to io thread failed: %d\n", -ret);
bc1d72e73be63 (Richard Weinberger 2013-08-18 13:30:07 +0200 1346) kfree(io_req);
bc1d72e73be63 (Richard Weinberger 2013-08-18 13:30:07 +0200 1347) }
ecb0a83e3198f (Christoph Hellwig 2018-10-18 22:55:03 +0200 1348) return ret;
bc1d72e73be63 (Richard Weinberger 2013-08-18 13:30:07 +0200 1349) }
bc1d72e73be63 (Richard Weinberger 2013-08-18 13:30:07 +0200 1350)
4e6da0fe8058d (Richard Weinberger 2017-11-26 13:33:11 +0100 1351) static blk_status_t ubd_queue_rq(struct blk_mq_hw_ctx *hctx,
4e6da0fe8058d (Richard Weinberger 2017-11-26 13:33:11 +0100 1352) const struct blk_mq_queue_data *bd)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1353) {
6961cd4d0fde9 (Jens Axboe 2018-11-07 14:34:05 -0700 1354) struct ubd *ubd_dev = hctx->queue->queuedata;
4e6da0fe8058d (Richard Weinberger 2017-11-26 13:33:11 +0100 1355) struct request *req = bd->rq;
53766defb8c86 (Anton Ivanov 2018-11-14 18:41:07 +0000 1356) int ret = 0, res = BLK_STS_OK;
a0044bdf60c21 (Jeff Dike 2007-05-06 14:51:36 -0700 1357)
4e6da0fe8058d (Richard Weinberger 2017-11-26 13:33:11 +0100 1358) blk_mq_start_request(req);
4e6da0fe8058d (Richard Weinberger 2017-11-26 13:33:11 +0100 1359)
6961cd4d0fde9 (Jens Axboe 2018-11-07 14:34:05 -0700 1360) spin_lock_irq(&ubd_dev->lock);
6961cd4d0fde9 (Jens Axboe 2018-11-07 14:34:05 -0700 1361)
53766defb8c86 (Anton Ivanov 2018-11-14 18:41:07 +0000 1362) switch (req_op(req)) {
53766defb8c86 (Anton Ivanov 2018-11-14 18:41:07 +0000 1363) case REQ_OP_FLUSH:
53766defb8c86 (Anton Ivanov 2018-11-14 18:41:07 +0000 1364) case REQ_OP_READ:
53766defb8c86 (Anton Ivanov 2018-11-14 18:41:07 +0000 1365) case REQ_OP_WRITE:
50109b5a03b40 (Anton Ivanov 2018-11-14 18:41:09 +0000 1366) case REQ_OP_DISCARD:
50109b5a03b40 (Anton Ivanov 2018-11-14 18:41:09 +0000 1367) case REQ_OP_WRITE_ZEROES:
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1368) ret = ubd_submit_request(ubd_dev, req);
50109b5a03b40 (Anton Ivanov 2018-11-14 18:41:09 +0000 1369) break;
53766defb8c86 (Anton Ivanov 2018-11-14 18:41:07 +0000 1370) default:
53766defb8c86 (Anton Ivanov 2018-11-14 18:41:07 +0000 1371) WARN_ON_ONCE(1);
53766defb8c86 (Anton Ivanov 2018-11-14 18:41:07 +0000 1372) res = BLK_STS_NOTSUPP;
4e6da0fe8058d (Richard Weinberger 2017-11-26 13:33:11 +0100 1373) }
53766defb8c86 (Anton Ivanov 2018-11-14 18:41:07 +0000 1374)
6961cd4d0fde9 (Jens Axboe 2018-11-07 14:34:05 -0700 1375) spin_unlock_irq(&ubd_dev->lock);
6961cd4d0fde9 (Jens Axboe 2018-11-07 14:34:05 -0700 1376)
d848074b2f1eb (Anton Ivanov 2019-10-29 09:13:34 +0000 1377) if (ret < 0) {
d848074b2f1eb (Anton Ivanov 2019-10-29 09:13:34 +0000 1378) if (ret == -ENOMEM)
d848074b2f1eb (Anton Ivanov 2019-10-29 09:13:34 +0000 1379) res = BLK_STS_RESOURCE;
d848074b2f1eb (Anton Ivanov 2019-10-29 09:13:34 +0000 1380) else
d848074b2f1eb (Anton Ivanov 2019-10-29 09:13:34 +0000 1381) res = BLK_STS_DEV_RESOURCE;
d848074b2f1eb (Anton Ivanov 2019-10-29 09:13:34 +0000 1382) }
6961cd4d0fde9 (Jens Axboe 2018-11-07 14:34:05 -0700 1383)
53766defb8c86 (Anton Ivanov 2018-11-14 18:41:07 +0000 1384) return res;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1385) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1386)
a885c8c4316e1 (Christoph Hellwig 2006-01-08 01:02:50 -0800 1387) static int ubd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
a885c8c4316e1 (Christoph Hellwig 2006-01-08 01:02:50 -0800 1388) {
7d314e346d608 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:05 -0800 1389) struct ubd *ubd_dev = bdev->bd_disk->private_data;
a885c8c4316e1 (Christoph Hellwig 2006-01-08 01:02:50 -0800 1390)
a885c8c4316e1 (Christoph Hellwig 2006-01-08 01:02:50 -0800 1391) geo->heads = 128;
a885c8c4316e1 (Christoph Hellwig 2006-01-08 01:02:50 -0800 1392) geo->sectors = 32;
7d314e346d608 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:05 -0800 1393) geo->cylinders = ubd_dev->size / (128 * 32 * 512);
a885c8c4316e1 (Christoph Hellwig 2006-01-08 01:02:50 -0800 1394) return 0;
a885c8c4316e1 (Christoph Hellwig 2006-01-08 01:02:50 -0800 1395) }
a885c8c4316e1 (Christoph Hellwig 2006-01-08 01:02:50 -0800 1396)
a625c998e638c (Al Viro 2008-03-02 09:16:26 -0500 1397) static int ubd_ioctl(struct block_device *bdev, fmode_t mode,
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1398) unsigned int cmd, unsigned long arg)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1399) {
a625c998e638c (Al Viro 2008-03-02 09:16:26 -0500 1400) struct ubd *ubd_dev = bdev->bd_disk->private_data;
73855e13b2bce (Bartlomiej Zolnierkiewicz 2009-04-01 21:42:21 +0200 1401) u16 ubd_id[ATA_ID_WORDS];
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1402)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1403) switch (cmd) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1404) struct cdrom_volctrl volume;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1405) case HDIO_GET_IDENTITY:
73855e13b2bce (Bartlomiej Zolnierkiewicz 2009-04-01 21:42:21 +0200 1406) memset(&ubd_id, 0, ATA_ID_WORDS * 2);
73855e13b2bce (Bartlomiej Zolnierkiewicz 2009-04-01 21:42:21 +0200 1407) ubd_id[ATA_ID_CYLS] = ubd_dev->size / (128 * 32 * 512);
73855e13b2bce (Bartlomiej Zolnierkiewicz 2009-04-01 21:42:21 +0200 1408) ubd_id[ATA_ID_HEADS] = 128;
73855e13b2bce (Bartlomiej Zolnierkiewicz 2009-04-01 21:42:21 +0200 1409) ubd_id[ATA_ID_SECTORS] = 32;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1410) if(copy_to_user((char __user *) arg, (char *) &ubd_id,
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1411) sizeof(ubd_id)))
dc764e5087bce (Jeff Dike 2007-05-06 14:51:41 -0700 1412) return -EFAULT;
dc764e5087bce (Jeff Dike 2007-05-06 14:51:41 -0700 1413) return 0;
b8831a1d2c78c (Jeff Dike 2007-02-10 01:44:17 -0800 1414)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1415) case CDROMVOLREAD:
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1416) if(copy_from_user(&volume, (char __user *) arg, sizeof(volume)))
dc764e5087bce (Jeff Dike 2007-05-06 14:51:41 -0700 1417) return -EFAULT;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1418) volume.channel0 = 255;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1419) volume.channel1 = 255;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1420) volume.channel2 = 255;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1421) volume.channel3 = 255;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1422) if(copy_to_user((char __user *) arg, &volume, sizeof(volume)))
dc764e5087bce (Jeff Dike 2007-05-06 14:51:41 -0700 1423) return -EFAULT;
dc764e5087bce (Jeff Dike 2007-05-06 14:51:41 -0700 1424) return 0;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1425) }
dc764e5087bce (Jeff Dike 2007-05-06 14:51:41 -0700 1426) return -EINVAL;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1427) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1428)
a43c83161a5ec (Anton Ivanov 2018-11-14 18:41:06 +0000 1429) static int map_error(int error_code)
a43c83161a5ec (Anton Ivanov 2018-11-14 18:41:06 +0000 1430) {
a43c83161a5ec (Anton Ivanov 2018-11-14 18:41:06 +0000 1431) switch (error_code) {
a43c83161a5ec (Anton Ivanov 2018-11-14 18:41:06 +0000 1432) case 0:
a43c83161a5ec (Anton Ivanov 2018-11-14 18:41:06 +0000 1433) return BLK_STS_OK;
a43c83161a5ec (Anton Ivanov 2018-11-14 18:41:06 +0000 1434) case ENOSYS:
a43c83161a5ec (Anton Ivanov 2018-11-14 18:41:06 +0000 1435) case EOPNOTSUPP:
a43c83161a5ec (Anton Ivanov 2018-11-14 18:41:06 +0000 1436) return BLK_STS_NOTSUPP;
a43c83161a5ec (Anton Ivanov 2018-11-14 18:41:06 +0000 1437) case ENOSPC:
a43c83161a5ec (Anton Ivanov 2018-11-14 18:41:06 +0000 1438) return BLK_STS_NOSPC;
a43c83161a5ec (Anton Ivanov 2018-11-14 18:41:06 +0000 1439) }
a43c83161a5ec (Anton Ivanov 2018-11-14 18:41:06 +0000 1440) return BLK_STS_IOERR;
a43c83161a5ec (Anton Ivanov 2018-11-14 18:41:06 +0000 1441) }
a43c83161a5ec (Anton Ivanov 2018-11-14 18:41:06 +0000 1442)
a41421edb926f (Anton Ivanov 2018-11-14 18:41:08 +0000 1443) /*
a41421edb926f (Anton Ivanov 2018-11-14 18:41:08 +0000 1444) * Everything from here onwards *IS NOT PART OF THE KERNEL*
a41421edb926f (Anton Ivanov 2018-11-14 18:41:08 +0000 1445) *
a41421edb926f (Anton Ivanov 2018-11-14 18:41:08 +0000 1446) * The following functions are part of UML hypervisor code.
a41421edb926f (Anton Ivanov 2018-11-14 18:41:08 +0000 1447) * All functions from here onwards are executed as a helper
a41421edb926f (Anton Ivanov 2018-11-14 18:41:08 +0000 1448) * thread and are not allowed to execute any kernel functions.
a41421edb926f (Anton Ivanov 2018-11-14 18:41:08 +0000 1449) *
a41421edb926f (Anton Ivanov 2018-11-14 18:41:08 +0000 1450) * Any communication must occur strictly via shared memory and IPC.
a41421edb926f (Anton Ivanov 2018-11-14 18:41:08 +0000 1451) *
a41421edb926f (Anton Ivanov 2018-11-14 18:41:08 +0000 1452) * Do not add printks, locks, kernel memory operations, etc - it
a41421edb926f (Anton Ivanov 2018-11-14 18:41:08 +0000 1453) * will result in unpredictable behaviour and/or crashes.
a41421edb926f (Anton Ivanov 2018-11-14 18:41:08 +0000 1454) */
a41421edb926f (Anton Ivanov 2018-11-14 18:41:08 +0000 1455)
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1456) static int update_bitmap(struct io_thread_req *req, struct io_desc *segment)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1457) {
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1458) int n;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1459)
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1460) if (segment->cow_offset == -1)
a43c83161a5ec (Anton Ivanov 2018-11-14 18:41:06 +0000 1461) return map_error(0);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1462)
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1463) n = os_pwrite_file(req->fds[1], &segment->bitmap_words,
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1464) sizeof(segment->bitmap_words), segment->cow_offset);
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1465) if (n != sizeof(segment->bitmap_words))
a43c83161a5ec (Anton Ivanov 2018-11-14 18:41:06 +0000 1466) return map_error(-n);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1467)
a43c83161a5ec (Anton Ivanov 2018-11-14 18:41:06 +0000 1468) return map_error(0);
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1469) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1470)
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1471) static void do_io(struct io_thread_req *req, struct io_desc *desc)
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1472) {
50109b5a03b40 (Anton Ivanov 2018-11-14 18:41:09 +0000 1473) char *buf = NULL;
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1474) unsigned long len;
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1475) int n, nsectors, start, end, bit;
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1476) __u64 off;
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1477)
50109b5a03b40 (Anton Ivanov 2018-11-14 18:41:09 +0000 1478) /* FLUSH is really a special case, we cannot "case" it with others */
50109b5a03b40 (Anton Ivanov 2018-11-14 18:41:09 +0000 1479)
a43c83161a5ec (Anton Ivanov 2018-11-14 18:41:06 +0000 1480) if (req_op(req->req) == REQ_OP_FLUSH) {
805f11a0d5156 (Richard Weinberger 2013-08-18 13:30:06 +0200 1481) /* fds[0] is always either the rw image or our cow file */
a41421edb926f (Anton Ivanov 2018-11-14 18:41:08 +0000 1482) req->error = map_error(-os_sync_file(req->fds[0]));
805f11a0d5156 (Richard Weinberger 2013-08-18 13:30:06 +0200 1483) return;
805f11a0d5156 (Richard Weinberger 2013-08-18 13:30:06 +0200 1484) }
805f11a0d5156 (Richard Weinberger 2013-08-18 13:30:06 +0200 1485)
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1486) nsectors = desc->length / req->sectorsize;
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1487) start = 0;
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1488) do {
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1489) bit = ubd_test_bit(start, (unsigned char *) &desc->sector_mask);
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1490) end = start;
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1491) while((end < nsectors) &&
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1492) (ubd_test_bit(end, (unsigned char *) &desc->sector_mask) == bit))
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1493) end++;
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1494)
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1495) off = req->offset + req->offsets[bit] +
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1496) start * req->sectorsize;
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1497) len = (end - start) * req->sectorsize;
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1498) if (desc->buffer != NULL)
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1499) buf = &desc->buffer[start * req->sectorsize];
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1500)
50109b5a03b40 (Anton Ivanov 2018-11-14 18:41:09 +0000 1501) switch (req_op(req->req)) {
50109b5a03b40 (Anton Ivanov 2018-11-14 18:41:09 +0000 1502) case REQ_OP_READ:
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1503) n = 0;
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1504) do {
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1505) buf = &buf[n];
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1506) len -= n;
8c6157b6b30a7 (Anton Ivanov 2015-12-21 18:54:00 +0000 1507) n = os_pread_file(req->fds[bit], buf, len, off);
50109b5a03b40 (Anton Ivanov 2018-11-14 18:41:09 +0000 1508) if (n < 0) {
a43c83161a5ec (Anton Ivanov 2018-11-14 18:41:06 +0000 1509) req->error = map_error(-n);
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1510) return;
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1511) }
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1512) } while((n < len) && (n != 0));
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1513) if (n < len) memset(&buf[n], 0, len - n);
50109b5a03b40 (Anton Ivanov 2018-11-14 18:41:09 +0000 1514) break;
50109b5a03b40 (Anton Ivanov 2018-11-14 18:41:09 +0000 1515) case REQ_OP_WRITE:
8c6157b6b30a7 (Anton Ivanov 2015-12-21 18:54:00 +0000 1516) n = os_pwrite_file(req->fds[bit], buf, len, off);
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1517) if(n != len){
a43c83161a5ec (Anton Ivanov 2018-11-14 18:41:06 +0000 1518) req->error = map_error(-n);
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1519) return;
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1520) }
50109b5a03b40 (Anton Ivanov 2018-11-14 18:41:09 +0000 1521) break;
50109b5a03b40 (Anton Ivanov 2018-11-14 18:41:09 +0000 1522) case REQ_OP_DISCARD:
50109b5a03b40 (Anton Ivanov 2018-11-14 18:41:09 +0000 1523) case REQ_OP_WRITE_ZEROES:
50109b5a03b40 (Anton Ivanov 2018-11-14 18:41:09 +0000 1524) n = os_falloc_punch(req->fds[bit], off, len);
50109b5a03b40 (Anton Ivanov 2018-11-14 18:41:09 +0000 1525) if (n) {
50109b5a03b40 (Anton Ivanov 2018-11-14 18:41:09 +0000 1526) req->error = map_error(-n);
50109b5a03b40 (Anton Ivanov 2018-11-14 18:41:09 +0000 1527) return;
50109b5a03b40 (Anton Ivanov 2018-11-14 18:41:09 +0000 1528) }
50109b5a03b40 (Anton Ivanov 2018-11-14 18:41:09 +0000 1529) break;
50109b5a03b40 (Anton Ivanov 2018-11-14 18:41:09 +0000 1530) default:
50109b5a03b40 (Anton Ivanov 2018-11-14 18:41:09 +0000 1531) WARN_ON_ONCE(1);
50109b5a03b40 (Anton Ivanov 2018-11-14 18:41:09 +0000 1532) req->error = BLK_STS_NOTSUPP;
50109b5a03b40 (Anton Ivanov 2018-11-14 18:41:09 +0000 1533) return;
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1534) }
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1535)
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1536) start = end;
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1537) } while(start < nsectors);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1538)
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1539) req->offset += len;
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1540) req->error = update_bitmap(req, desc);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1541) }
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1542)
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1543) /* Changed in start_io_thread, which is serialized by being called only
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1544) * from ubd_init, which is an initcall.
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1545) */
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1546) int kernel_fd = -1;
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1547)
d8d7c28ec0b50 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:12 -0800 1548) /* Only changed by the io thread. XXX: currently unused. */
d8d7c28ec0b50 (Paolo 'Blaisorblade' Giarrusso 2006-10-30 22:07:12 -0800 1549) static int io_count = 0;
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1550)
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1551) int io_thread(void *arg)
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1552) {
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 1553) int n, count, written, res;
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1554)
91d44ff860a9e (Richard Weinberger 2013-08-18 13:30:08 +0200 1555) os_fix_helper_signals();
91d44ff860a9e (Richard Weinberger 2013-08-18 13:30:08 +0200 1556)
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1557) while(1){
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 1558) n = bulk_req_safe_read(
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 1559) kernel_fd,
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 1560) io_req_buffer,
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 1561) &io_remainder,
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 1562) &io_remainder_size,
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 1563) UBD_REQ_BUFFER_SIZE
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 1564) );
e355b2f55efc4 (Gabriel Krisman Bertazi 2020-03-16 20:45:07 -0400 1565) if (n <= 0) {
e355b2f55efc4 (Gabriel Krisman Bertazi 2020-03-16 20:45:07 -0400 1566) if (n == -EAGAIN)
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 1567) ubd_read_poll(-1);
e355b2f55efc4 (Gabriel Krisman Bertazi 2020-03-16 20:45:07 -0400 1568)
e355b2f55efc4 (Gabriel Krisman Bertazi 2020-03-16 20:45:07 -0400 1569) continue;
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1570) }
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 1571)
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 1572) for (count = 0; count < n/sizeof(struct io_thread_req *); count++) {
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1573) struct io_thread_req *req = (*io_req_buffer)[count];
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1574) int i;
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1575)
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 1576) io_count++;
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1577) for (i = 0; !req->error && i < req->desc_cnt; i++)
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1578) do_io(req, &(req->io_desc[i]));
fc6b6a872dcd4 (Gabriel Krisman Bertazi 2020-11-21 23:13:56 -0500 1579)
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 1580) }
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 1581)
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 1582) written = 0;
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 1583)
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 1584) do {
6e682d53fc1ef (Gabriel Krisman Bertazi 2020-03-16 20:45:06 -0400 1585) res = os_write_file(kernel_fd,
6e682d53fc1ef (Gabriel Krisman Bertazi 2020-03-16 20:45:06 -0400 1586) ((char *) io_req_buffer) + written,
6e682d53fc1ef (Gabriel Krisman Bertazi 2020-03-16 20:45:06 -0400 1587) n - written);
ff6a17989c08b (Anton Ivanov 2017-11-20 21:17:58 +0000 1588) if (res >= 0) {
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 1589) written += res;
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 1590) }
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 1591) if (written < n) {
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 1592) ubd_write_poll(-1);
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 1593) }
f88f0bdfc32f3 (Anton Ivanov 2016-11-09 20:43:25 +0000 1594) } while (written < n);
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1595) }
91acb21f084aa (Jeff Dike 2005-10-10 23:10:32 -0400 1596)
1b57e9c27882a (Jeff Dike 2006-01-06 00:18:49 -0800 1597) return 0;
1b57e9c27882a (Jeff Dike 2006-01-06 00:18:49 -0800 1598) }
VisionFive2 Linux kernel
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