Jeff Dike | 6c29256c | 2006-03-27 01:14:37 -0800 | [diff] [blame] | 1 | /* |
Anton Ivanov | f88f0bd | 2016-11-09 20:43:25 +0000 | [diff] [blame] | 2 | * Copyright (C) 2015-2016 Anton Ivanov (aivanov@brocade.com) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3 | * Copyright (C) 2000 Jeff Dike (jdike@karaya.com) |
| 4 | * Licensed under the GPL |
| 5 | */ |
| 6 | |
| 7 | /* 2001-09-28...2002-04-17 |
| 8 | * Partition stuff by James_McMechan@hotmail.com |
| 9 | * old style ubd by setting UBD_SHIFT to 0 |
| 10 | * 2002-09-27...2002-10-18 massive tinkering for 2.5 |
| 11 | * partitions have changed in 2.5 |
| 12 | * 2003-01-29 more tinkering for 2.5.59-1 |
| 13 | * This should now address the sysfs problems and has |
| 14 | * the symlink for devfs to allow for booting with |
| 15 | * the common /dev/ubd/discX/... names rather than |
| 16 | * only /dev/ubdN/discN this version also has lots of |
| 17 | * clean ups preparing for ubd-many. |
| 18 | * James McMechan |
| 19 | */ |
| 20 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | #define UBD_SHIFT 4 |
| 22 | |
Al Viro | 8ea3c06 | 2011-08-18 18:04:41 -0400 | [diff] [blame] | 23 | #include <linux/module.h> |
| 24 | #include <linux/init.h> |
| 25 | #include <linux/blkdev.h> |
| 26 | #include <linux/ata.h> |
| 27 | #include <linux/hdreg.h> |
| 28 | #include <linux/cdrom.h> |
| 29 | #include <linux/proc_fs.h> |
| 30 | #include <linux/seq_file.h> |
| 31 | #include <linux/ctype.h> |
| 32 | #include <linux/slab.h> |
| 33 | #include <linux/vmalloc.h> |
| 34 | #include <linux/platform_device.h> |
| 35 | #include <linux/scatterlist.h> |
| 36 | #include <asm/tlbflush.h> |
Al Viro | 37185b3 | 2012-10-08 03:27:32 +0100 | [diff] [blame] | 37 | #include <kern_util.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | #include "mconsole_kern.h" |
Al Viro | 37185b3 | 2012-10-08 03:27:32 +0100 | [diff] [blame] | 39 | #include <init.h> |
| 40 | #include <irq_kern.h> |
Al Viro | 8ea3c06 | 2011-08-18 18:04:41 -0400 | [diff] [blame] | 41 | #include "ubd.h" |
Al Viro | 37185b3 | 2012-10-08 03:27:32 +0100 | [diff] [blame] | 42 | #include <os.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | #include "cow.h" |
| 44 | |
Richard Weinberger | 805f11a | 2013-08-18 13:30:06 +0200 | [diff] [blame] | 45 | enum ubd_req { UBD_READ, UBD_WRITE, UBD_FLUSH }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | |
| 47 | struct io_thread_req { |
Jeff Dike | 62f96cb | 2007-02-10 01:44:16 -0800 | [diff] [blame] | 48 | struct request *req; |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 49 | enum ubd_req op; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | int fds[2]; |
| 51 | unsigned long offsets[2]; |
| 52 | unsigned long long offset; |
| 53 | unsigned long length; |
| 54 | char *buffer; |
| 55 | int sectorsize; |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 56 | unsigned long sector_mask; |
| 57 | unsigned long long cow_offset; |
| 58 | unsigned long bitmap_words[2]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | int error; |
| 60 | }; |
| 61 | |
Anton Ivanov | f88f0bd | 2016-11-09 20:43:25 +0000 | [diff] [blame] | 62 | |
| 63 | static struct io_thread_req * (*irq_req_buffer)[]; |
| 64 | static struct io_thread_req *irq_remainder; |
| 65 | static int irq_remainder_size; |
| 66 | |
| 67 | static struct io_thread_req * (*io_req_buffer)[]; |
| 68 | static struct io_thread_req *io_remainder; |
| 69 | static int io_remainder_size; |
| 70 | |
| 71 | |
| 72 | |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 73 | static inline int ubd_test_bit(__u64 bit, unsigned char *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | { |
| 75 | __u64 n; |
| 76 | int bits, off; |
| 77 | |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 78 | bits = sizeof(data[0]) * 8; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | n = bit / bits; |
| 80 | off = bit % bits; |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 81 | return (data[n] & (1 << off)) != 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | } |
| 83 | |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 84 | static inline void ubd_set_bit(__u64 bit, unsigned char *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | { |
| 86 | __u64 n; |
| 87 | int bits, off; |
| 88 | |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 89 | bits = sizeof(data[0]) * 8; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 90 | n = bit / bits; |
| 91 | off = bit % bits; |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 92 | data[n] |= (1 << off); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | } |
| 94 | /*End stuff from ubd_user.h*/ |
| 95 | |
| 96 | #define DRIVER_NAME "uml-blkdev" |
| 97 | |
Paolo 'Blaisorblade' Giarrusso | d7fb2c3 | 2006-10-30 22:07:07 -0800 | [diff] [blame] | 98 | static DEFINE_MUTEX(ubd_lock); |
Arnd Bergmann | 9a181c5 | 2010-09-11 18:38:03 +0200 | [diff] [blame] | 99 | static DEFINE_MUTEX(ubd_mutex); /* replaces BKL, might not be needed */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | |
Al Viro | a625c99 | 2008-03-02 09:16:26 -0500 | [diff] [blame] | 101 | static int ubd_open(struct block_device *bdev, fmode_t mode); |
Al Viro | db2a144 | 2013-05-05 21:52:57 -0400 | [diff] [blame] | 102 | static void ubd_release(struct gendisk *disk, fmode_t mode); |
Al Viro | a625c99 | 2008-03-02 09:16:26 -0500 | [diff] [blame] | 103 | static int ubd_ioctl(struct block_device *bdev, fmode_t mode, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | unsigned int cmd, unsigned long arg); |
Christoph Hellwig | a885c8c | 2006-01-08 01:02:50 -0800 | [diff] [blame] | 105 | static int ubd_getgeo(struct block_device *bdev, struct hd_geometry *geo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | |
Paolo 'Blaisorblade' Giarrusso | 97d88ac | 2006-10-30 22:07:03 -0800 | [diff] [blame] | 107 | #define MAX_DEV (16) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | |
Alexey Dobriyan | 83d5cde | 2009-09-21 17:01:13 -0700 | [diff] [blame] | 109 | static const struct block_device_operations ubd_blops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | .owner = THIS_MODULE, |
Al Viro | a625c99 | 2008-03-02 09:16:26 -0500 | [diff] [blame] | 111 | .open = ubd_open, |
| 112 | .release = ubd_release, |
| 113 | .ioctl = ubd_ioctl, |
Christoph Hellwig | a885c8c | 2006-01-08 01:02:50 -0800 | [diff] [blame] | 114 | .getgeo = ubd_getgeo, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | }; |
| 116 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 117 | /* Protected by ubd_lock */ |
Christoph Hellwig | 792dd4f | 2009-03-31 15:23:39 -0700 | [diff] [blame] | 118 | static int fake_major = UBD_MAJOR; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | static struct gendisk *ubd_gendisk[MAX_DEV]; |
| 120 | static struct gendisk *fake_gendisk[MAX_DEV]; |
Jeff Dike | 6c29256c | 2006-03-27 01:14:37 -0800 | [diff] [blame] | 121 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | #ifdef CONFIG_BLK_DEV_UBD_SYNC |
| 123 | #define OPEN_FLAGS ((struct openflags) { .r = 1, .w = 1, .s = 1, .c = 0, \ |
| 124 | .cl = 1 }) |
| 125 | #else |
| 126 | #define OPEN_FLAGS ((struct openflags) { .r = 1, .w = 1, .s = 0, .c = 0, \ |
| 127 | .cl = 1 }) |
| 128 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 129 | static struct openflags global_openflags = OPEN_FLAGS; |
| 130 | |
| 131 | struct cow { |
Paolo 'Blaisorblade' Giarrusso | 2a9d32f | 2006-10-30 22:07:04 -0800 | [diff] [blame] | 132 | /* backing file name */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | char *file; |
Paolo 'Blaisorblade' Giarrusso | 2a9d32f | 2006-10-30 22:07:04 -0800 | [diff] [blame] | 134 | /* backing file fd */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 135 | int fd; |
| 136 | unsigned long *bitmap; |
| 137 | unsigned long bitmap_len; |
| 138 | int bitmap_offset; |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 139 | int data_offset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | }; |
| 141 | |
Jeff Dike | a0044bd | 2007-05-06 14:51:36 -0700 | [diff] [blame] | 142 | #define MAX_SG 64 |
| 143 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 144 | struct ubd { |
Jeff Dike | a0044bd | 2007-05-06 14:51:36 -0700 | [diff] [blame] | 145 | struct list_head restart; |
Paolo 'Blaisorblade' Giarrusso | 2a9d32f | 2006-10-30 22:07:04 -0800 | [diff] [blame] | 146 | /* name (and fd, below) of the file opened for writing, either the |
| 147 | * backing or the cow file. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | char *file; |
| 149 | int count; |
| 150 | int fd; |
| 151 | __u64 size; |
| 152 | struct openflags boot_openflags; |
| 153 | struct openflags openflags; |
Paolo 'Blaisorblade' Giarrusso | 84e945e | 2006-10-30 22:07:10 -0800 | [diff] [blame] | 154 | unsigned shared:1; |
| 155 | unsigned no_cow:1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | struct cow cow; |
| 157 | struct platform_device pdev; |
Jeff Dike | 62f96cb | 2007-02-10 01:44:16 -0800 | [diff] [blame] | 158 | struct request_queue *queue; |
| 159 | spinlock_t lock; |
Jeff Dike | a0044bd | 2007-05-06 14:51:36 -0700 | [diff] [blame] | 160 | struct scatterlist sg[MAX_SG]; |
| 161 | struct request *request; |
| 162 | int start_sg, end_sg; |
Tejun Heo | 4752690 | 2010-10-15 12:56:21 +0200 | [diff] [blame] | 163 | sector_t rq_pos; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 164 | }; |
| 165 | |
| 166 | #define DEFAULT_COW { \ |
| 167 | .file = NULL, \ |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 168 | .fd = -1, \ |
| 169 | .bitmap = NULL, \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | .bitmap_offset = 0, \ |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 171 | .data_offset = 0, \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 172 | } |
| 173 | |
| 174 | #define DEFAULT_UBD { \ |
| 175 | .file = NULL, \ |
| 176 | .count = 0, \ |
| 177 | .fd = -1, \ |
| 178 | .size = -1, \ |
| 179 | .boot_openflags = OPEN_FLAGS, \ |
| 180 | .openflags = OPEN_FLAGS, \ |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 181 | .no_cow = 0, \ |
Jeff Dike | 6c29256c | 2006-03-27 01:14:37 -0800 | [diff] [blame] | 182 | .shared = 0, \ |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 183 | .cow = DEFAULT_COW, \ |
Thomas Gleixner | 22e6500 | 2011-01-23 15:21:25 +0100 | [diff] [blame] | 184 | .lock = __SPIN_LOCK_UNLOCKED(ubd_devs.lock), \ |
Jeff Dike | a0044bd | 2007-05-06 14:51:36 -0700 | [diff] [blame] | 185 | .request = NULL, \ |
| 186 | .start_sg = 0, \ |
| 187 | .end_sg = 0, \ |
Tejun Heo | 4752690 | 2010-10-15 12:56:21 +0200 | [diff] [blame] | 188 | .rq_pos = 0, \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | } |
| 190 | |
Jeff Dike | b8831a1 | 2007-02-10 01:44:17 -0800 | [diff] [blame] | 191 | /* Protected by ubd_lock */ |
WANG Cong | 5dc62b1 | 2008-04-28 02:13:58 -0700 | [diff] [blame] | 192 | static struct ubd ubd_devs[MAX_DEV] = { [0 ... MAX_DEV - 1] = DEFAULT_UBD }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 194 | /* Only changed by fake_ide_setup which is a setup */ |
| 195 | static int fake_ide = 0; |
| 196 | static struct proc_dir_entry *proc_ide_root = NULL; |
| 197 | static struct proc_dir_entry *proc_ide = NULL; |
| 198 | |
| 199 | static void make_proc_ide(void) |
| 200 | { |
| 201 | proc_ide_root = proc_mkdir("ide", NULL); |
| 202 | proc_ide = proc_mkdir("ide0", proc_ide_root); |
| 203 | } |
| 204 | |
Alexey Dobriyan | 6613c5e | 2009-12-14 18:00:11 -0800 | [diff] [blame] | 205 | static int fake_ide_media_proc_show(struct seq_file *m, void *v) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 206 | { |
Alexey Dobriyan | 6613c5e | 2009-12-14 18:00:11 -0800 | [diff] [blame] | 207 | seq_puts(m, "disk\n"); |
| 208 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 209 | } |
| 210 | |
WANG Cong | c0a9290 | 2008-02-04 22:30:41 -0800 | [diff] [blame] | 211 | static void make_ide_entries(const char *dev_name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | { |
| 213 | struct proc_dir_entry *dir, *ent; |
| 214 | char name[64]; |
| 215 | |
| 216 | if(proc_ide_root == NULL) make_proc_ide(); |
| 217 | |
| 218 | dir = proc_mkdir(dev_name, proc_ide); |
| 219 | if(!dir) return; |
| 220 | |
Christoph Hellwig | 3f3942a | 2018-05-15 15:57:23 +0200 | [diff] [blame^] | 221 | ent = proc_create_single("media", S_IRUGO, dir, |
| 222 | fake_ide_media_proc_show); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | if(!ent) return; |
WANG Cong | c0a9290 | 2008-02-04 22:30:41 -0800 | [diff] [blame] | 224 | snprintf(name, sizeof(name), "ide0/%s", dev_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 225 | proc_symlink(dev_name, proc_ide_root, name); |
| 226 | } |
| 227 | |
| 228 | static int fake_ide_setup(char *str) |
| 229 | { |
| 230 | fake_ide = 1; |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 231 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | } |
| 233 | |
| 234 | __setup("fake_ide", fake_ide_setup); |
| 235 | |
| 236 | __uml_help(fake_ide_setup, |
| 237 | "fake_ide\n" |
| 238 | " Create ide0 entries that map onto ubd devices.\n\n" |
| 239 | ); |
| 240 | |
| 241 | static int parse_unit(char **ptr) |
| 242 | { |
| 243 | char *str = *ptr, *end; |
| 244 | int n = -1; |
| 245 | |
| 246 | if(isdigit(*str)) { |
| 247 | n = simple_strtoul(str, &end, 0); |
| 248 | if(end == str) |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 249 | return -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 250 | *ptr = end; |
| 251 | } |
Paolo 'Blaisorblade' Giarrusso | 97d88ac | 2006-10-30 22:07:03 -0800 | [diff] [blame] | 252 | else if (('a' <= *str) && (*str <= 'z')) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | n = *str - 'a'; |
| 254 | str++; |
| 255 | *ptr = str; |
| 256 | } |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 257 | return n; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | } |
| 259 | |
Paolo 'Blaisorblade' Giarrusso | d8d7c28 | 2006-10-30 22:07:12 -0800 | [diff] [blame] | 260 | /* If *index_out == -1 at exit, the passed option was a general one; |
| 261 | * otherwise, the str pointer is used (and owned) inside ubd_devs array, so it |
| 262 | * should not be freed on exit. |
| 263 | */ |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 264 | static int ubd_setup_common(char *str, int *index_out, char **error_out) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 265 | { |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 266 | struct ubd *ubd_dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | struct openflags flags = global_openflags; |
| 268 | char *backing_file; |
Jeff Dike | b8831a1 | 2007-02-10 01:44:17 -0800 | [diff] [blame] | 269 | int n, err = 0, i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 270 | |
| 271 | if(index_out) *index_out = -1; |
| 272 | n = *str; |
| 273 | if(n == '='){ |
| 274 | char *end; |
| 275 | int major; |
| 276 | |
| 277 | str++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | if(!strcmp(str, "sync")){ |
| 279 | global_openflags = of_sync(global_openflags); |
Jeff Dike | b8831a1 | 2007-02-10 01:44:17 -0800 | [diff] [blame] | 280 | goto out1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | } |
| 282 | |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 283 | err = -EINVAL; |
Jeff Dike | b8831a1 | 2007-02-10 01:44:17 -0800 | [diff] [blame] | 284 | major = simple_strtoul(str, &end, 0); |
| 285 | if((*end != '\0') || (end == str)){ |
| 286 | *error_out = "Didn't parse major number"; |
| 287 | goto out1; |
| 288 | } |
| 289 | |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 290 | mutex_lock(&ubd_lock); |
Christoph Hellwig | 792dd4f | 2009-03-31 15:23:39 -0700 | [diff] [blame] | 291 | if (fake_major != UBD_MAJOR) { |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 292 | *error_out = "Can't assign a fake major twice"; |
| 293 | goto out1; |
| 294 | } |
Jeff Dike | 6c29256c | 2006-03-27 01:14:37 -0800 | [diff] [blame] | 295 | |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 296 | fake_major = major; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | |
| 298 | printk(KERN_INFO "Setting extra ubd major number to %d\n", |
| 299 | major); |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 300 | err = 0; |
| 301 | out1: |
| 302 | mutex_unlock(&ubd_lock); |
| 303 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | } |
| 305 | |
| 306 | n = parse_unit(&str); |
| 307 | if(n < 0){ |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 308 | *error_out = "Couldn't parse device number"; |
| 309 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 310 | } |
| 311 | if(n >= MAX_DEV){ |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 312 | *error_out = "Device number out of range"; |
| 313 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 314 | } |
| 315 | |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 316 | err = -EBUSY; |
Paolo 'Blaisorblade' Giarrusso | d7fb2c3 | 2006-10-30 22:07:07 -0800 | [diff] [blame] | 317 | mutex_lock(&ubd_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 318 | |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 319 | ubd_dev = &ubd_devs[n]; |
| 320 | if(ubd_dev->file != NULL){ |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 321 | *error_out = "Device is already configured"; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 322 | goto out; |
| 323 | } |
| 324 | |
| 325 | if (index_out) |
| 326 | *index_out = n; |
| 327 | |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 328 | err = -EINVAL; |
Jeff Dike | 6c29256c | 2006-03-27 01:14:37 -0800 | [diff] [blame] | 329 | for (i = 0; i < sizeof("rscd="); i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 330 | switch (*str) { |
| 331 | case 'r': |
| 332 | flags.w = 0; |
| 333 | break; |
| 334 | case 's': |
| 335 | flags.s = 1; |
| 336 | break; |
| 337 | case 'd': |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 338 | ubd_dev->no_cow = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 339 | break; |
Jeff Dike | 6c29256c | 2006-03-27 01:14:37 -0800 | [diff] [blame] | 340 | case 'c': |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 341 | ubd_dev->shared = 1; |
Jeff Dike | 6c29256c | 2006-03-27 01:14:37 -0800 | [diff] [blame] | 342 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 343 | case '=': |
| 344 | str++; |
| 345 | goto break_loop; |
| 346 | default: |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 347 | *error_out = "Expected '=' or flag letter " |
| 348 | "(r, s, c, or d)"; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 349 | goto out; |
| 350 | } |
| 351 | str++; |
| 352 | } |
| 353 | |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 354 | if (*str == '=') |
| 355 | *error_out = "Too many flags specified"; |
| 356 | else |
| 357 | *error_out = "Missing '='"; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | goto out; |
| 359 | |
| 360 | break_loop: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | backing_file = strchr(str, ','); |
| 362 | |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 363 | if (backing_file == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 364 | backing_file = strchr(str, ':'); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 365 | |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 366 | if(backing_file != NULL){ |
| 367 | if(ubd_dev->no_cow){ |
| 368 | *error_out = "Can't specify both 'd' and a cow file"; |
| 369 | goto out; |
| 370 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 371 | else { |
| 372 | *backing_file = '\0'; |
| 373 | backing_file++; |
| 374 | } |
| 375 | } |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 376 | err = 0; |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 377 | ubd_dev->file = str; |
| 378 | ubd_dev->cow.file = backing_file; |
| 379 | ubd_dev->boot_openflags = flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 380 | out: |
Paolo 'Blaisorblade' Giarrusso | d7fb2c3 | 2006-10-30 22:07:07 -0800 | [diff] [blame] | 381 | mutex_unlock(&ubd_lock); |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 382 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 383 | } |
| 384 | |
| 385 | static int ubd_setup(char *str) |
| 386 | { |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 387 | char *error; |
| 388 | int err; |
| 389 | |
| 390 | err = ubd_setup_common(str, NULL, &error); |
| 391 | if(err) |
| 392 | printk(KERN_ERR "Failed to initialize device with \"%s\" : " |
| 393 | "%s\n", str, error); |
| 394 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | } |
| 396 | |
| 397 | __setup("ubd", ubd_setup); |
| 398 | __uml_help(ubd_setup, |
| 399 | "ubd<n><flags>=<filename>[(:|,)<filename2>]\n" |
| 400 | " This is used to associate a device with a file in the underlying\n" |
| 401 | " filesystem. When specifying two filenames, the first one is the\n" |
| 402 | " COW name and the second is the backing file name. As separator you can\n" |
| 403 | " use either a ':' or a ',': the first one allows writing things like;\n" |
| 404 | " ubd0=~/Uml/root_cow:~/Uml/root_backing_file\n" |
| 405 | " while with a ',' the shell would not expand the 2nd '~'.\n" |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 406 | " When using only one filename, UML will detect whether to treat it like\n" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 407 | " a COW file or a backing file. To override this detection, add the 'd'\n" |
| 408 | " flag:\n" |
| 409 | " ubd0d=BackingFile\n" |
| 410 | " Usually, there is a filesystem in the file, but \n" |
| 411 | " that's not required. Swap devices containing swap files can be\n" |
| 412 | " specified like this. Also, a file which doesn't contain a\n" |
| 413 | " filesystem can have its contents read in the virtual \n" |
| 414 | " machine by running 'dd' on the device. <n> must be in the range\n" |
| 415 | " 0 to 7. Appending an 'r' to the number will cause that device\n" |
| 416 | " to be mounted read-only. For example ubd1r=./ext_fs. Appending\n" |
Jeff Dike | 20ede45 | 2008-02-04 22:30:37 -0800 | [diff] [blame] | 417 | " an 's' will cause data to be written to disk on the host immediately.\n" |
| 418 | " 'c' will cause the device to be treated as being shared between multiple\n" |
| 419 | " UMLs and file locking will be turned off - this is appropriate for a\n" |
| 420 | " cluster filesystem and inappropriate at almost all other times.\n\n" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 421 | ); |
| 422 | |
Jeff Dike | 8299ca5 | 2008-02-04 22:30:48 -0800 | [diff] [blame] | 423 | static int udb_setup(char *str) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 424 | { |
| 425 | printk("udb%s specified on command line is almost certainly a ubd -> " |
| 426 | "udb TYPO\n", str); |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 427 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 428 | } |
| 429 | |
| 430 | __setup("udb", udb_setup); |
| 431 | __uml_help(udb_setup, |
| 432 | "udb\n" |
Jeff Dike | 0894e27 | 2005-05-28 15:51:55 -0700 | [diff] [blame] | 433 | " This option is here solely to catch ubd -> udb typos, which can be\n" |
| 434 | " to impossible to catch visually unless you specifically look for\n" |
| 435 | " them. The only result of any option starting with 'udb' is an error\n" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 436 | " in the boot output.\n\n" |
| 437 | ); |
| 438 | |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 439 | static void do_ubd_request(struct request_queue * q); |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 440 | |
| 441 | /* Only changed by ubd_init, which is an initcall. */ |
WANG Cong | 5dc62b1 | 2008-04-28 02:13:58 -0700 | [diff] [blame] | 442 | static int thread_fd = -1; |
Jeff Dike | a0044bd | 2007-05-06 14:51:36 -0700 | [diff] [blame] | 443 | static LIST_HEAD(restart); |
| 444 | |
Anton Ivanov | f88f0bd | 2016-11-09 20:43:25 +0000 | [diff] [blame] | 445 | /* Function to read several request pointers at a time |
| 446 | * handling fractional reads if (and as) needed |
| 447 | */ |
| 448 | |
| 449 | static int bulk_req_safe_read( |
| 450 | int fd, |
| 451 | struct io_thread_req * (*request_buffer)[], |
| 452 | struct io_thread_req **remainder, |
| 453 | int *remainder_size, |
| 454 | int max_recs |
| 455 | ) |
| 456 | { |
| 457 | int n = 0; |
| 458 | int res = 0; |
| 459 | |
| 460 | if (*remainder_size > 0) { |
| 461 | memmove( |
| 462 | (char *) request_buffer, |
| 463 | (char *) remainder, *remainder_size |
| 464 | ); |
| 465 | n = *remainder_size; |
| 466 | } |
| 467 | |
| 468 | res = os_read_file( |
| 469 | fd, |
| 470 | ((char *) request_buffer) + *remainder_size, |
| 471 | sizeof(struct io_thread_req *)*max_recs |
| 472 | - *remainder_size |
| 473 | ); |
| 474 | if (res > 0) { |
| 475 | n += res; |
| 476 | if ((n % sizeof(struct io_thread_req *)) > 0) { |
| 477 | /* |
| 478 | * Read somehow returned not a multiple of dword |
| 479 | * theoretically possible, but never observed in the |
| 480 | * wild, so read routine must be able to handle it |
| 481 | */ |
| 482 | *remainder_size = n % sizeof(struct io_thread_req *); |
| 483 | WARN(*remainder_size > 0, "UBD IPC read returned a partial result"); |
| 484 | memmove( |
| 485 | remainder, |
| 486 | ((char *) request_buffer) + |
| 487 | (n/sizeof(struct io_thread_req *))*sizeof(struct io_thread_req *), |
| 488 | *remainder_size |
| 489 | ); |
| 490 | n = n - *remainder_size; |
| 491 | } |
| 492 | } else { |
| 493 | n = res; |
| 494 | } |
| 495 | return n; |
| 496 | } |
| 497 | |
Jeff Dike | 62f96cb | 2007-02-10 01:44:16 -0800 | [diff] [blame] | 498 | /* Called without dev->lock held, and only in interrupt context. */ |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 499 | static void ubd_handler(void) |
| 500 | { |
Jeff Dike | a0044bd | 2007-05-06 14:51:36 -0700 | [diff] [blame] | 501 | struct ubd *ubd; |
| 502 | struct list_head *list, *next_ele; |
| 503 | unsigned long flags; |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 504 | int n; |
Anton Ivanov | f88f0bd | 2016-11-09 20:43:25 +0000 | [diff] [blame] | 505 | int count; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 506 | |
Jeff Dike | a0044bd | 2007-05-06 14:51:36 -0700 | [diff] [blame] | 507 | while(1){ |
Anton Ivanov | f88f0bd | 2016-11-09 20:43:25 +0000 | [diff] [blame] | 508 | n = bulk_req_safe_read( |
| 509 | thread_fd, |
| 510 | irq_req_buffer, |
| 511 | &irq_remainder, |
| 512 | &irq_remainder_size, |
| 513 | UBD_REQ_BUFFER_SIZE |
| 514 | ); |
| 515 | if (n < 0) { |
Jeff Dike | a0044bd | 2007-05-06 14:51:36 -0700 | [diff] [blame] | 516 | if(n == -EAGAIN) |
| 517 | break; |
| 518 | printk(KERN_ERR "spurious interrupt in ubd_handler, " |
| 519 | "err = %d\n", -n); |
| 520 | return; |
| 521 | } |
Anton Ivanov | f88f0bd | 2016-11-09 20:43:25 +0000 | [diff] [blame] | 522 | for (count = 0; count < n/sizeof(struct io_thread_req *); count++) { |
| 523 | blk_end_request( |
| 524 | (*irq_req_buffer)[count]->req, |
Christoph Hellwig | 2a842ac | 2017-06-03 09:38:04 +0200 | [diff] [blame] | 525 | BLK_STS_OK, |
Anton Ivanov | f88f0bd | 2016-11-09 20:43:25 +0000 | [diff] [blame] | 526 | (*irq_req_buffer)[count]->length |
| 527 | ); |
| 528 | kfree((*irq_req_buffer)[count]); |
| 529 | } |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 530 | } |
Jeff Dike | 62f96cb | 2007-02-10 01:44:16 -0800 | [diff] [blame] | 531 | reactivate_fd(thread_fd, UBD_IRQ); |
Jeff Dike | a0044bd | 2007-05-06 14:51:36 -0700 | [diff] [blame] | 532 | |
| 533 | list_for_each_safe(list, next_ele, &restart){ |
| 534 | ubd = container_of(list, struct ubd, restart); |
| 535 | list_del_init(&ubd->restart); |
| 536 | spin_lock_irqsave(&ubd->lock, flags); |
| 537 | do_ubd_request(ubd->queue); |
| 538 | spin_unlock_irqrestore(&ubd->lock, flags); |
| 539 | } |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 540 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 541 | |
Al Viro | 7bea96f | 2006-10-08 22:49:34 +0100 | [diff] [blame] | 542 | static irqreturn_t ubd_intr(int irq, void *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 543 | { |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 544 | ubd_handler(); |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 545 | return IRQ_HANDLED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 546 | } |
| 547 | |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 548 | /* Only changed by ubd_init, which is an initcall. */ |
| 549 | static int io_pid = -1; |
| 550 | |
WANG Cong | 5dc62b1 | 2008-04-28 02:13:58 -0700 | [diff] [blame] | 551 | static void kill_io_thread(void) |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 552 | { |
Jeff Dike | 6c29256c | 2006-03-27 01:14:37 -0800 | [diff] [blame] | 553 | if(io_pid != -1) |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 554 | os_kill_process(io_pid, 1); |
| 555 | } |
| 556 | |
| 557 | __uml_exitcall(kill_io_thread); |
| 558 | |
Paolo 'Blaisorblade' Giarrusso | d8d7c28 | 2006-10-30 22:07:12 -0800 | [diff] [blame] | 559 | static inline int ubd_file_size(struct ubd *ubd_dev, __u64 *size_out) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 560 | { |
| 561 | char *file; |
Richard Weinberger | 8535639 | 2011-11-02 13:17:27 +0100 | [diff] [blame] | 562 | int fd; |
| 563 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 564 | |
Richard Weinberger | 8535639 | 2011-11-02 13:17:27 +0100 | [diff] [blame] | 565 | __u32 version; |
| 566 | __u32 align; |
| 567 | char *backing_file; |
| 568 | time_t mtime; |
| 569 | unsigned long long size; |
| 570 | int sector_size; |
| 571 | int bitmap_offset; |
| 572 | |
| 573 | if (ubd_dev->file && ubd_dev->cow.file) { |
| 574 | file = ubd_dev->cow.file; |
| 575 | |
| 576 | goto out; |
| 577 | } |
| 578 | |
Martin Pärtel | d4afcba | 2012-08-02 00:44:22 +0200 | [diff] [blame] | 579 | fd = os_open_file(ubd_dev->file, of_read(OPENFLAGS()), 0); |
Richard Weinberger | 8535639 | 2011-11-02 13:17:27 +0100 | [diff] [blame] | 580 | if (fd < 0) |
| 581 | return fd; |
| 582 | |
| 583 | err = read_cow_header(file_reader, &fd, &version, &backing_file, \ |
| 584 | &mtime, &size, §or_size, &align, &bitmap_offset); |
| 585 | os_close_file(fd); |
| 586 | |
| 587 | if(err == -EINVAL) |
| 588 | file = ubd_dev->file; |
| 589 | else |
| 590 | file = backing_file; |
| 591 | |
| 592 | out: |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 593 | return os_file_size(file, size_out); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 594 | } |
| 595 | |
WANG Cong | 5dc62b1 | 2008-04-28 02:13:58 -0700 | [diff] [blame] | 596 | static int read_cow_bitmap(int fd, void *buf, int offset, int len) |
| 597 | { |
| 598 | int err; |
| 599 | |
Anton Ivanov | 8c6157b | 2015-12-21 18:54:00 +0000 | [diff] [blame] | 600 | err = os_pread_file(fd, buf, len, offset); |
WANG Cong | 5dc62b1 | 2008-04-28 02:13:58 -0700 | [diff] [blame] | 601 | if (err < 0) |
| 602 | return err; |
| 603 | |
| 604 | return 0; |
| 605 | } |
| 606 | |
| 607 | static int backing_file_mismatch(char *file, __u64 size, time_t mtime) |
| 608 | { |
| 609 | unsigned long modtime; |
| 610 | unsigned long long actual; |
| 611 | int err; |
| 612 | |
| 613 | err = os_file_modtime(file, &modtime); |
| 614 | if (err < 0) { |
| 615 | printk(KERN_ERR "Failed to get modification time of backing " |
| 616 | "file \"%s\", err = %d\n", file, -err); |
| 617 | return err; |
| 618 | } |
| 619 | |
| 620 | err = os_file_size(file, &actual); |
| 621 | if (err < 0) { |
| 622 | printk(KERN_ERR "Failed to get size of backing file \"%s\", " |
| 623 | "err = %d\n", file, -err); |
| 624 | return err; |
| 625 | } |
| 626 | |
| 627 | if (actual != size) { |
| 628 | /*__u64 can be a long on AMD64 and with %lu GCC complains; so |
| 629 | * the typecast.*/ |
| 630 | printk(KERN_ERR "Size mismatch (%llu vs %llu) of COW header " |
| 631 | "vs backing file\n", (unsigned long long) size, actual); |
| 632 | return -EINVAL; |
| 633 | } |
| 634 | if (modtime != mtime) { |
| 635 | printk(KERN_ERR "mtime mismatch (%ld vs %ld) of COW header vs " |
| 636 | "backing file\n", mtime, modtime); |
| 637 | return -EINVAL; |
| 638 | } |
| 639 | return 0; |
| 640 | } |
| 641 | |
| 642 | static int path_requires_switch(char *from_cmdline, char *from_cow, char *cow) |
| 643 | { |
| 644 | struct uml_stat buf1, buf2; |
| 645 | int err; |
| 646 | |
| 647 | if (from_cmdline == NULL) |
| 648 | return 0; |
| 649 | if (!strcmp(from_cmdline, from_cow)) |
| 650 | return 0; |
| 651 | |
| 652 | err = os_stat_file(from_cmdline, &buf1); |
| 653 | if (err < 0) { |
| 654 | printk(KERN_ERR "Couldn't stat '%s', err = %d\n", from_cmdline, |
| 655 | -err); |
| 656 | return 0; |
| 657 | } |
| 658 | err = os_stat_file(from_cow, &buf2); |
| 659 | if (err < 0) { |
| 660 | printk(KERN_ERR "Couldn't stat '%s', err = %d\n", from_cow, |
| 661 | -err); |
| 662 | return 1; |
| 663 | } |
| 664 | if ((buf1.ust_dev == buf2.ust_dev) && (buf1.ust_ino == buf2.ust_ino)) |
| 665 | return 0; |
| 666 | |
| 667 | printk(KERN_ERR "Backing file mismatch - \"%s\" requested, " |
| 668 | "\"%s\" specified in COW header of \"%s\"\n", |
| 669 | from_cmdline, from_cow, cow); |
| 670 | return 1; |
| 671 | } |
| 672 | |
| 673 | static int open_ubd_file(char *file, struct openflags *openflags, int shared, |
| 674 | char **backing_file_out, int *bitmap_offset_out, |
| 675 | unsigned long *bitmap_len_out, int *data_offset_out, |
| 676 | int *create_cow_out) |
| 677 | { |
| 678 | time_t mtime; |
| 679 | unsigned long long size; |
| 680 | __u32 version, align; |
| 681 | char *backing_file; |
| 682 | int fd, err, sectorsize, asked_switch, mode = 0644; |
| 683 | |
| 684 | fd = os_open_file(file, *openflags, mode); |
| 685 | if (fd < 0) { |
| 686 | if ((fd == -ENOENT) && (create_cow_out != NULL)) |
| 687 | *create_cow_out = 1; |
| 688 | if (!openflags->w || |
| 689 | ((fd != -EROFS) && (fd != -EACCES))) |
| 690 | return fd; |
| 691 | openflags->w = 0; |
| 692 | fd = os_open_file(file, *openflags, mode); |
| 693 | if (fd < 0) |
| 694 | return fd; |
| 695 | } |
| 696 | |
| 697 | if (shared) |
| 698 | printk(KERN_INFO "Not locking \"%s\" on the host\n", file); |
| 699 | else { |
| 700 | err = os_lock_file(fd, openflags->w); |
| 701 | if (err < 0) { |
| 702 | printk(KERN_ERR "Failed to lock '%s', err = %d\n", |
| 703 | file, -err); |
| 704 | goto out_close; |
| 705 | } |
| 706 | } |
| 707 | |
| 708 | /* Successful return case! */ |
| 709 | if (backing_file_out == NULL) |
| 710 | return fd; |
| 711 | |
| 712 | err = read_cow_header(file_reader, &fd, &version, &backing_file, &mtime, |
| 713 | &size, §orsize, &align, bitmap_offset_out); |
| 714 | if (err && (*backing_file_out != NULL)) { |
| 715 | printk(KERN_ERR "Failed to read COW header from COW file " |
| 716 | "\"%s\", errno = %d\n", file, -err); |
| 717 | goto out_close; |
| 718 | } |
| 719 | if (err) |
| 720 | return fd; |
| 721 | |
| 722 | asked_switch = path_requires_switch(*backing_file_out, backing_file, |
| 723 | file); |
| 724 | |
| 725 | /* Allow switching only if no mismatch. */ |
| 726 | if (asked_switch && !backing_file_mismatch(*backing_file_out, size, |
| 727 | mtime)) { |
| 728 | printk(KERN_ERR "Switching backing file to '%s'\n", |
| 729 | *backing_file_out); |
| 730 | err = write_cow_header(file, fd, *backing_file_out, |
| 731 | sectorsize, align, &size); |
| 732 | if (err) { |
| 733 | printk(KERN_ERR "Switch failed, errno = %d\n", -err); |
| 734 | goto out_close; |
| 735 | } |
| 736 | } else { |
| 737 | *backing_file_out = backing_file; |
| 738 | err = backing_file_mismatch(*backing_file_out, size, mtime); |
| 739 | if (err) |
| 740 | goto out_close; |
| 741 | } |
| 742 | |
| 743 | cow_sizes(version, size, sectorsize, align, *bitmap_offset_out, |
| 744 | bitmap_len_out, data_offset_out); |
| 745 | |
| 746 | return fd; |
| 747 | out_close: |
| 748 | os_close_file(fd); |
| 749 | return err; |
| 750 | } |
| 751 | |
| 752 | static int create_cow_file(char *cow_file, char *backing_file, |
| 753 | struct openflags flags, |
| 754 | int sectorsize, int alignment, int *bitmap_offset_out, |
| 755 | unsigned long *bitmap_len_out, int *data_offset_out) |
| 756 | { |
| 757 | int err, fd; |
| 758 | |
| 759 | flags.c = 1; |
| 760 | fd = open_ubd_file(cow_file, &flags, 0, NULL, NULL, NULL, NULL, NULL); |
| 761 | if (fd < 0) { |
| 762 | err = fd; |
| 763 | printk(KERN_ERR "Open of COW file '%s' failed, errno = %d\n", |
| 764 | cow_file, -err); |
| 765 | goto out; |
| 766 | } |
| 767 | |
| 768 | err = init_cow_file(fd, cow_file, backing_file, sectorsize, alignment, |
| 769 | bitmap_offset_out, bitmap_len_out, |
| 770 | data_offset_out); |
| 771 | if (!err) |
| 772 | return fd; |
| 773 | os_close_file(fd); |
| 774 | out: |
| 775 | return err; |
| 776 | } |
| 777 | |
Paolo 'Blaisorblade' Giarrusso | 5f75a4f | 2006-10-30 22:07:06 -0800 | [diff] [blame] | 778 | static void ubd_close_dev(struct ubd *ubd_dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 779 | { |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 780 | os_close_file(ubd_dev->fd); |
| 781 | if(ubd_dev->cow.file == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 782 | return; |
| 783 | |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 784 | os_close_file(ubd_dev->cow.fd); |
| 785 | vfree(ubd_dev->cow.bitmap); |
| 786 | ubd_dev->cow.bitmap = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 787 | } |
| 788 | |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 789 | static int ubd_open_dev(struct ubd *ubd_dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 790 | { |
| 791 | struct openflags flags; |
| 792 | char **back_ptr; |
| 793 | int err, create_cow, *create_ptr; |
Paolo 'Blaisorblade' Giarrusso | 0bf16bf | 2006-10-30 22:07:11 -0800 | [diff] [blame] | 794 | int fd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 795 | |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 796 | ubd_dev->openflags = ubd_dev->boot_openflags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 797 | create_cow = 0; |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 798 | create_ptr = (ubd_dev->cow.file != NULL) ? &create_cow : NULL; |
| 799 | back_ptr = ubd_dev->no_cow ? NULL : &ubd_dev->cow.file; |
Paolo 'Blaisorblade' Giarrusso | 0bf16bf | 2006-10-30 22:07:11 -0800 | [diff] [blame] | 800 | |
| 801 | fd = open_ubd_file(ubd_dev->file, &ubd_dev->openflags, ubd_dev->shared, |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 802 | back_ptr, &ubd_dev->cow.bitmap_offset, |
| 803 | &ubd_dev->cow.bitmap_len, &ubd_dev->cow.data_offset, |
Jeff Dike | 6c29256c | 2006-03-27 01:14:37 -0800 | [diff] [blame] | 804 | create_ptr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 805 | |
Paolo 'Blaisorblade' Giarrusso | 0bf16bf | 2006-10-30 22:07:11 -0800 | [diff] [blame] | 806 | if((fd == -ENOENT) && create_cow){ |
| 807 | fd = create_cow_file(ubd_dev->file, ubd_dev->cow.file, |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 808 | ubd_dev->openflags, 1 << 9, PAGE_SIZE, |
| 809 | &ubd_dev->cow.bitmap_offset, |
| 810 | &ubd_dev->cow.bitmap_len, |
| 811 | &ubd_dev->cow.data_offset); |
Paolo 'Blaisorblade' Giarrusso | 0bf16bf | 2006-10-30 22:07:11 -0800 | [diff] [blame] | 812 | if(fd >= 0){ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 813 | printk(KERN_INFO "Creating \"%s\" as COW file for " |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 814 | "\"%s\"\n", ubd_dev->file, ubd_dev->cow.file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 815 | } |
| 816 | } |
| 817 | |
Paolo 'Blaisorblade' Giarrusso | 0bf16bf | 2006-10-30 22:07:11 -0800 | [diff] [blame] | 818 | if(fd < 0){ |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 819 | printk("Failed to open '%s', errno = %d\n", ubd_dev->file, |
Paolo 'Blaisorblade' Giarrusso | 0bf16bf | 2006-10-30 22:07:11 -0800 | [diff] [blame] | 820 | -fd); |
| 821 | return fd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 822 | } |
Paolo 'Blaisorblade' Giarrusso | 0bf16bf | 2006-10-30 22:07:11 -0800 | [diff] [blame] | 823 | ubd_dev->fd = fd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 824 | |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 825 | if(ubd_dev->cow.file != NULL){ |
Martin K. Petersen | 086fa5f | 2010-02-26 00:20:38 -0500 | [diff] [blame] | 826 | blk_queue_max_hw_sectors(ubd_dev->queue, 8 * sizeof(long)); |
Jeff Dike | f4768ff | 2007-08-22 14:01:53 -0700 | [diff] [blame] | 827 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 828 | err = -ENOMEM; |
Jesper Juhl | da2486b | 2007-10-16 01:27:19 -0700 | [diff] [blame] | 829 | ubd_dev->cow.bitmap = vmalloc(ubd_dev->cow.bitmap_len); |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 830 | if(ubd_dev->cow.bitmap == NULL){ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 831 | printk(KERN_ERR "Failed to vmalloc COW bitmap\n"); |
| 832 | goto error; |
| 833 | } |
| 834 | flush_tlb_kernel_vm(); |
| 835 | |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 836 | err = read_cow_bitmap(ubd_dev->fd, ubd_dev->cow.bitmap, |
| 837 | ubd_dev->cow.bitmap_offset, |
| 838 | ubd_dev->cow.bitmap_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 839 | if(err < 0) |
| 840 | goto error; |
| 841 | |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 842 | flags = ubd_dev->openflags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 843 | flags.w = 0; |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 844 | err = open_ubd_file(ubd_dev->cow.file, &flags, ubd_dev->shared, NULL, |
Jeff Dike | 6c29256c | 2006-03-27 01:14:37 -0800 | [diff] [blame] | 845 | NULL, NULL, NULL, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 846 | if(err < 0) goto error; |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 847 | ubd_dev->cow.fd = err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 848 | } |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 849 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 850 | error: |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 851 | os_close_file(ubd_dev->fd); |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 852 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 853 | } |
| 854 | |
Jeff Dike | 2e3f525 | 2007-05-06 14:51:29 -0700 | [diff] [blame] | 855 | static void ubd_device_release(struct device *dev) |
| 856 | { |
Greg Kroah-Hartman | 8691b97 | 2009-05-04 12:40:54 -0700 | [diff] [blame] | 857 | struct ubd *ubd_dev = dev_get_drvdata(dev); |
Jeff Dike | 2e3f525 | 2007-05-06 14:51:29 -0700 | [diff] [blame] | 858 | |
| 859 | blk_cleanup_queue(ubd_dev->queue); |
| 860 | *ubd_dev = ((struct ubd) DEFAULT_UBD); |
| 861 | } |
| 862 | |
Paolo 'Blaisorblade' Giarrusso | 5f75a4f | 2006-10-30 22:07:06 -0800 | [diff] [blame] | 863 | static int ubd_disk_register(int major, u64 size, int unit, |
Jeff Dike | b8831a1 | 2007-02-10 01:44:17 -0800 | [diff] [blame] | 864 | struct gendisk **disk_out) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 865 | { |
Dan Williams | d72a578 | 2016-06-20 10:44:32 -0700 | [diff] [blame] | 866 | struct device *parent = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 867 | struct gendisk *disk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 868 | |
| 869 | disk = alloc_disk(1 << UBD_SHIFT); |
| 870 | if(disk == NULL) |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 871 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 872 | |
| 873 | disk->major = major; |
| 874 | disk->first_minor = unit << UBD_SHIFT; |
| 875 | disk->fops = &ubd_blops; |
| 876 | set_capacity(disk, size / 512); |
Christoph Hellwig | 792dd4f | 2009-03-31 15:23:39 -0700 | [diff] [blame] | 877 | if (major == UBD_MAJOR) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 878 | sprintf(disk->disk_name, "ubd%c", 'a' + unit); |
Greg Kroah-Hartman | ce7b0f4 | 2005-06-20 21:15:16 -0700 | [diff] [blame] | 879 | else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 880 | sprintf(disk->disk_name, "ubd_fake%d", unit); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 881 | |
| 882 | /* sysfs register (not for ide fake devices) */ |
Christoph Hellwig | 792dd4f | 2009-03-31 15:23:39 -0700 | [diff] [blame] | 883 | if (major == UBD_MAJOR) { |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 884 | ubd_devs[unit].pdev.id = unit; |
| 885 | ubd_devs[unit].pdev.name = DRIVER_NAME; |
Jeff Dike | 2e3f525 | 2007-05-06 14:51:29 -0700 | [diff] [blame] | 886 | ubd_devs[unit].pdev.dev.release = ubd_device_release; |
Greg Kroah-Hartman | 8691b97 | 2009-05-04 12:40:54 -0700 | [diff] [blame] | 887 | dev_set_drvdata(&ubd_devs[unit].pdev.dev, &ubd_devs[unit]); |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 888 | platform_device_register(&ubd_devs[unit].pdev); |
Dan Williams | d72a578 | 2016-06-20 10:44:32 -0700 | [diff] [blame] | 889 | parent = &ubd_devs[unit].pdev.dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 890 | } |
| 891 | |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 892 | disk->private_data = &ubd_devs[unit]; |
Jeff Dike | 62f96cb | 2007-02-10 01:44:16 -0800 | [diff] [blame] | 893 | disk->queue = ubd_devs[unit].queue; |
Dan Williams | d72a578 | 2016-06-20 10:44:32 -0700 | [diff] [blame] | 894 | device_add_disk(parent, disk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 895 | |
| 896 | *disk_out = disk; |
| 897 | return 0; |
| 898 | } |
| 899 | |
| 900 | #define ROUND_BLOCK(n) ((n + ((1 << 9) - 1)) & (-1 << 9)) |
| 901 | |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 902 | static int ubd_add(int n, char **error_out) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 903 | { |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 904 | struct ubd *ubd_dev = &ubd_devs[n]; |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 905 | int err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 906 | |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 907 | if(ubd_dev->file == NULL) |
Jeff Dike | ec7cf78 | 2005-09-03 15:57:29 -0700 | [diff] [blame] | 908 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 909 | |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 910 | err = ubd_file_size(ubd_dev, &ubd_dev->size); |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 911 | if(err < 0){ |
| 912 | *error_out = "Couldn't determine size of device's file"; |
Jeff Dike | 80c1374 | 2006-09-29 01:58:51 -0700 | [diff] [blame] | 913 | goto out; |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 914 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 915 | |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 916 | ubd_dev->size = ROUND_BLOCK(ubd_dev->size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 917 | |
Jeff Dike | a0044bd | 2007-05-06 14:51:36 -0700 | [diff] [blame] | 918 | INIT_LIST_HEAD(&ubd_dev->restart); |
WANG Cong | 4f40c05 | 2007-11-05 14:50:59 -0800 | [diff] [blame] | 919 | sg_init_table(ubd_dev->sg, MAX_SG); |
Jeff Dike | a0044bd | 2007-05-06 14:51:36 -0700 | [diff] [blame] | 920 | |
Jeff Dike | 62f96cb | 2007-02-10 01:44:16 -0800 | [diff] [blame] | 921 | err = -ENOMEM; |
| 922 | ubd_dev->queue = blk_init_queue(do_ubd_request, &ubd_dev->lock); |
| 923 | if (ubd_dev->queue == NULL) { |
| 924 | *error_out = "Failed to initialize device queue"; |
Jeff Dike | 80c1374 | 2006-09-29 01:58:51 -0700 | [diff] [blame] | 925 | goto out; |
Jeff Dike | 62f96cb | 2007-02-10 01:44:16 -0800 | [diff] [blame] | 926 | } |
| 927 | ubd_dev->queue->queuedata = ubd_dev; |
Jens Axboe | f935a8c | 2016-03-30 10:19:17 -0600 | [diff] [blame] | 928 | blk_queue_write_cache(ubd_dev->queue, true, false); |
Jeff Dike | 62f96cb | 2007-02-10 01:44:16 -0800 | [diff] [blame] | 929 | |
Martin K. Petersen | 8a78362 | 2010-02-26 00:20:39 -0500 | [diff] [blame] | 930 | blk_queue_max_segments(ubd_dev->queue, MAX_SG); |
Christoph Hellwig | 792dd4f | 2009-03-31 15:23:39 -0700 | [diff] [blame] | 931 | err = ubd_disk_register(UBD_MAJOR, ubd_dev->size, n, &ubd_gendisk[n]); |
Jeff Dike | 62f96cb | 2007-02-10 01:44:16 -0800 | [diff] [blame] | 932 | if(err){ |
| 933 | *error_out = "Failed to register device"; |
| 934 | goto out_cleanup; |
| 935 | } |
Jeff Dike | 6c29256c | 2006-03-27 01:14:37 -0800 | [diff] [blame] | 936 | |
Christoph Hellwig | 792dd4f | 2009-03-31 15:23:39 -0700 | [diff] [blame] | 937 | if (fake_major != UBD_MAJOR) |
Paolo 'Blaisorblade' Giarrusso | 5f75a4f | 2006-10-30 22:07:06 -0800 | [diff] [blame] | 938 | ubd_disk_register(fake_major, ubd_dev->size, n, |
Jeff Dike | 62f96cb | 2007-02-10 01:44:16 -0800 | [diff] [blame] | 939 | &fake_gendisk[n]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 940 | |
Jeff Dike | 83380cc | 2008-02-04 22:31:18 -0800 | [diff] [blame] | 941 | /* |
| 942 | * Perhaps this should also be under the "if (fake_major)" above |
| 943 | * using the fake_disk->disk_name |
| 944 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 945 | if (fake_ide) |
| 946 | make_ide_entries(ubd_gendisk[n]->disk_name); |
| 947 | |
Jeff Dike | ec7cf78 | 2005-09-03 15:57:29 -0700 | [diff] [blame] | 948 | err = 0; |
Jeff Dike | ec7cf78 | 2005-09-03 15:57:29 -0700 | [diff] [blame] | 949 | out: |
| 950 | return err; |
Jeff Dike | 62f96cb | 2007-02-10 01:44:16 -0800 | [diff] [blame] | 951 | |
| 952 | out_cleanup: |
| 953 | blk_cleanup_queue(ubd_dev->queue); |
| 954 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 955 | } |
| 956 | |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 957 | static int ubd_config(char *str, char **error_out) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 958 | { |
Paolo 'Blaisorblade' Giarrusso | e7f6552 | 2006-10-30 22:07:09 -0800 | [diff] [blame] | 959 | int n, ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 960 | |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 961 | /* This string is possibly broken up and stored, so it's only |
| 962 | * freed if ubd_setup_common fails, or if only general options |
| 963 | * were set. |
| 964 | */ |
Jeff Dike | 970d6e3 | 2006-01-06 00:18:48 -0800 | [diff] [blame] | 965 | str = kstrdup(str, GFP_KERNEL); |
Paolo 'Blaisorblade' Giarrusso | e7f6552 | 2006-10-30 22:07:09 -0800 | [diff] [blame] | 966 | if (str == NULL) { |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 967 | *error_out = "Failed to allocate memory"; |
| 968 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 969 | } |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 970 | |
| 971 | ret = ubd_setup_common(str, &n, error_out); |
| 972 | if (ret) |
Paolo 'Blaisorblade' Giarrusso | e7f6552 | 2006-10-30 22:07:09 -0800 | [diff] [blame] | 973 | goto err_free; |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 974 | |
Paolo 'Blaisorblade' Giarrusso | e7f6552 | 2006-10-30 22:07:09 -0800 | [diff] [blame] | 975 | if (n == -1) { |
| 976 | ret = 0; |
Paolo 'Blaisorblade' Giarrusso | d8d7c28 | 2006-10-30 22:07:12 -0800 | [diff] [blame] | 977 | goto err_free; |
Paolo 'Blaisorblade' Giarrusso | e7f6552 | 2006-10-30 22:07:09 -0800 | [diff] [blame] | 978 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 979 | |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 980 | mutex_lock(&ubd_lock); |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 981 | ret = ubd_add(n, error_out); |
Paolo 'Blaisorblade' Giarrusso | e7f6552 | 2006-10-30 22:07:09 -0800 | [diff] [blame] | 982 | if (ret) |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 983 | ubd_devs[n].file = NULL; |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 984 | mutex_unlock(&ubd_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 985 | |
Paolo 'Blaisorblade' Giarrusso | e7f6552 | 2006-10-30 22:07:09 -0800 | [diff] [blame] | 986 | out: |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 987 | return ret; |
Paolo 'Blaisorblade' Giarrusso | e7f6552 | 2006-10-30 22:07:09 -0800 | [diff] [blame] | 988 | |
| 989 | err_free: |
| 990 | kfree(str); |
| 991 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 992 | } |
| 993 | |
| 994 | static int ubd_get_config(char *name, char *str, int size, char **error_out) |
| 995 | { |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 996 | struct ubd *ubd_dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 997 | int n, len = 0; |
| 998 | |
| 999 | n = parse_unit(&name); |
| 1000 | if((n >= MAX_DEV) || (n < 0)){ |
| 1001 | *error_out = "ubd_get_config : device number out of range"; |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 1002 | return -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1003 | } |
| 1004 | |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 1005 | ubd_dev = &ubd_devs[n]; |
Paolo 'Blaisorblade' Giarrusso | d7fb2c3 | 2006-10-30 22:07:07 -0800 | [diff] [blame] | 1006 | mutex_lock(&ubd_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1007 | |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 1008 | if(ubd_dev->file == NULL){ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1009 | CONFIG_CHUNK(str, size, len, "", 1); |
| 1010 | goto out; |
| 1011 | } |
| 1012 | |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 1013 | CONFIG_CHUNK(str, size, len, ubd_dev->file, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1014 | |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 1015 | if(ubd_dev->cow.file != NULL){ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1016 | CONFIG_CHUNK(str, size, len, ",", 0); |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 1017 | CONFIG_CHUNK(str, size, len, ubd_dev->cow.file, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1018 | } |
| 1019 | else CONFIG_CHUNK(str, size, len, "", 1); |
| 1020 | |
| 1021 | out: |
Paolo 'Blaisorblade' Giarrusso | d7fb2c3 | 2006-10-30 22:07:07 -0800 | [diff] [blame] | 1022 | mutex_unlock(&ubd_lock); |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 1023 | return len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1024 | } |
| 1025 | |
Jeff Dike | 29d56cf | 2005-06-25 14:55:25 -0700 | [diff] [blame] | 1026 | static int ubd_id(char **str, int *start_out, int *end_out) |
| 1027 | { |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 1028 | int n; |
Jeff Dike | 29d56cf | 2005-06-25 14:55:25 -0700 | [diff] [blame] | 1029 | |
| 1030 | n = parse_unit(str); |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 1031 | *start_out = 0; |
| 1032 | *end_out = MAX_DEV - 1; |
| 1033 | return n; |
Jeff Dike | 29d56cf | 2005-06-25 14:55:25 -0700 | [diff] [blame] | 1034 | } |
| 1035 | |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 1036 | static int ubd_remove(int n, char **error_out) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1037 | { |
Jeff Dike | 2e3f525 | 2007-05-06 14:51:29 -0700 | [diff] [blame] | 1038 | struct gendisk *disk = ubd_gendisk[n]; |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 1039 | struct ubd *ubd_dev; |
Jeff Dike | 29d56cf | 2005-06-25 14:55:25 -0700 | [diff] [blame] | 1040 | int err = -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1041 | |
Paolo 'Blaisorblade' Giarrusso | d7fb2c3 | 2006-10-30 22:07:07 -0800 | [diff] [blame] | 1042 | mutex_lock(&ubd_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1043 | |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 1044 | ubd_dev = &ubd_devs[n]; |
Jeff Dike | 29d56cf | 2005-06-25 14:55:25 -0700 | [diff] [blame] | 1045 | |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 1046 | if(ubd_dev->file == NULL) |
Jeff Dike | 29d56cf | 2005-06-25 14:55:25 -0700 | [diff] [blame] | 1047 | goto out; |
| 1048 | |
| 1049 | /* you cannot remove a open disk */ |
| 1050 | err = -EBUSY; |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 1051 | if(ubd_dev->count > 0) |
Jeff Dike | 29d56cf | 2005-06-25 14:55:25 -0700 | [diff] [blame] | 1052 | goto out; |
| 1053 | |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 1054 | ubd_gendisk[n] = NULL; |
Jeff Dike | b47d2de | 2007-05-06 14:51:01 -0700 | [diff] [blame] | 1055 | if(disk != NULL){ |
| 1056 | del_gendisk(disk); |
| 1057 | put_disk(disk); |
| 1058 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1059 | |
| 1060 | if(fake_gendisk[n] != NULL){ |
| 1061 | del_gendisk(fake_gendisk[n]); |
| 1062 | put_disk(fake_gendisk[n]); |
| 1063 | fake_gendisk[n] = NULL; |
| 1064 | } |
| 1065 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1066 | err = 0; |
Jeff Dike | 2e3f525 | 2007-05-06 14:51:29 -0700 | [diff] [blame] | 1067 | platform_device_unregister(&ubd_dev->pdev); |
Jeff Dike | 29d56cf | 2005-06-25 14:55:25 -0700 | [diff] [blame] | 1068 | out: |
Paolo 'Blaisorblade' Giarrusso | d7fb2c3 | 2006-10-30 22:07:07 -0800 | [diff] [blame] | 1069 | mutex_unlock(&ubd_lock); |
Jeff Dike | 29d56cf | 2005-06-25 14:55:25 -0700 | [diff] [blame] | 1070 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1071 | } |
| 1072 | |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 1073 | /* All these are called by mconsole in process context and without |
Jeff Dike | b8831a1 | 2007-02-10 01:44:17 -0800 | [diff] [blame] | 1074 | * ubd-specific locks. The structure itself is const except for .list. |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 1075 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1076 | static struct mc_device ubd_mc = { |
Jeff Dike | 84f48d4 | 2007-02-10 01:44:01 -0800 | [diff] [blame] | 1077 | .list = LIST_HEAD_INIT(ubd_mc.list), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1078 | .name = "ubd", |
| 1079 | .config = ubd_config, |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 1080 | .get_config = ubd_get_config, |
Jeff Dike | 29d56cf | 2005-06-25 14:55:25 -0700 | [diff] [blame] | 1081 | .id = ubd_id, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1082 | .remove = ubd_remove, |
| 1083 | }; |
| 1084 | |
Paolo 'Blaisorblade' Giarrusso | d8d7c28 | 2006-10-30 22:07:12 -0800 | [diff] [blame] | 1085 | static int __init ubd_mc_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1086 | { |
| 1087 | mconsole_register_dev(&ubd_mc); |
| 1088 | return 0; |
| 1089 | } |
| 1090 | |
| 1091 | __initcall(ubd_mc_init); |
| 1092 | |
Paolo 'Blaisorblade' Giarrusso | d8d7c28 | 2006-10-30 22:07:12 -0800 | [diff] [blame] | 1093 | static int __init ubd0_init(void) |
| 1094 | { |
| 1095 | struct ubd *ubd_dev = &ubd_devs[0]; |
| 1096 | |
Jeff Dike | b8831a1 | 2007-02-10 01:44:17 -0800 | [diff] [blame] | 1097 | mutex_lock(&ubd_lock); |
Paolo 'Blaisorblade' Giarrusso | d8d7c28 | 2006-10-30 22:07:12 -0800 | [diff] [blame] | 1098 | if(ubd_dev->file == NULL) |
| 1099 | ubd_dev->file = "root_fs"; |
Jeff Dike | b8831a1 | 2007-02-10 01:44:17 -0800 | [diff] [blame] | 1100 | mutex_unlock(&ubd_lock); |
| 1101 | |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 1102 | return 0; |
Paolo 'Blaisorblade' Giarrusso | d8d7c28 | 2006-10-30 22:07:12 -0800 | [diff] [blame] | 1103 | } |
| 1104 | |
| 1105 | __initcall(ubd0_init); |
| 1106 | |
Jeff Dike | b8831a1 | 2007-02-10 01:44:17 -0800 | [diff] [blame] | 1107 | /* Used in ubd_init, which is an initcall */ |
Russell King | 3ae5eae | 2005-11-09 22:32:44 +0000 | [diff] [blame] | 1108 | static struct platform_driver ubd_driver = { |
| 1109 | .driver = { |
| 1110 | .name = DRIVER_NAME, |
| 1111 | }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1112 | }; |
| 1113 | |
Paolo 'Blaisorblade' Giarrusso | d8d7c28 | 2006-10-30 22:07:12 -0800 | [diff] [blame] | 1114 | static int __init ubd_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1115 | { |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 1116 | char *error; |
| 1117 | int i, err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1118 | |
Christoph Hellwig | 792dd4f | 2009-03-31 15:23:39 -0700 | [diff] [blame] | 1119 | if (register_blkdev(UBD_MAJOR, "ubd")) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1120 | return -1; |
| 1121 | |
Christoph Hellwig | 792dd4f | 2009-03-31 15:23:39 -0700 | [diff] [blame] | 1122 | if (fake_major != UBD_MAJOR) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1123 | char name[sizeof("ubd_nnn\0")]; |
| 1124 | |
| 1125 | snprintf(name, sizeof(name), "ubd_%d", fake_major); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1126 | if (register_blkdev(fake_major, "ubd")) |
| 1127 | return -1; |
| 1128 | } |
Anton Ivanov | f88f0bd | 2016-11-09 20:43:25 +0000 | [diff] [blame] | 1129 | |
| 1130 | irq_req_buffer = kmalloc( |
| 1131 | sizeof(struct io_thread_req *) * UBD_REQ_BUFFER_SIZE, |
| 1132 | GFP_KERNEL |
| 1133 | ); |
| 1134 | irq_remainder = 0; |
| 1135 | |
| 1136 | if (irq_req_buffer == NULL) { |
| 1137 | printk(KERN_ERR "Failed to initialize ubd buffering\n"); |
| 1138 | return -1; |
| 1139 | } |
| 1140 | io_req_buffer = kmalloc( |
| 1141 | sizeof(struct io_thread_req *) * UBD_REQ_BUFFER_SIZE, |
| 1142 | GFP_KERNEL |
| 1143 | ); |
| 1144 | |
| 1145 | io_remainder = 0; |
| 1146 | |
| 1147 | if (io_req_buffer == NULL) { |
| 1148 | printk(KERN_ERR "Failed to initialize ubd buffering\n"); |
| 1149 | return -1; |
| 1150 | } |
Russell King | 3ae5eae | 2005-11-09 22:32:44 +0000 | [diff] [blame] | 1151 | platform_driver_register(&ubd_driver); |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 1152 | mutex_lock(&ubd_lock); |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 1153 | for (i = 0; i < MAX_DEV; i++){ |
| 1154 | err = ubd_add(i, &error); |
| 1155 | if(err) |
| 1156 | printk(KERN_ERR "Failed to initialize ubd device %d :" |
| 1157 | "%s\n", i, error); |
| 1158 | } |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 1159 | mutex_unlock(&ubd_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1160 | return 0; |
| 1161 | } |
| 1162 | |
| 1163 | late_initcall(ubd_init); |
| 1164 | |
Paolo 'Blaisorblade' Giarrusso | d8d7c28 | 2006-10-30 22:07:12 -0800 | [diff] [blame] | 1165 | static int __init ubd_driver_init(void){ |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1166 | unsigned long stack; |
| 1167 | int err; |
| 1168 | |
| 1169 | /* Set by CONFIG_BLK_DEV_UBD_SYNC or ubd=sync.*/ |
| 1170 | if(global_openflags.s){ |
| 1171 | printk(KERN_INFO "ubd: Synchronous mode\n"); |
| 1172 | /* Letting ubd=sync be like using ubd#s= instead of ubd#= is |
| 1173 | * enough. So use anyway the io thread. */ |
| 1174 | } |
| 1175 | stack = alloc_stack(0, 0); |
Jeff Dike | 6c29256c | 2006-03-27 01:14:37 -0800 | [diff] [blame] | 1176 | io_pid = start_io_thread(stack + PAGE_SIZE - sizeof(void *), |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1177 | &thread_fd); |
| 1178 | if(io_pid < 0){ |
Jeff Dike | 6c29256c | 2006-03-27 01:14:37 -0800 | [diff] [blame] | 1179 | printk(KERN_ERR |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1180 | "ubd : Failed to start I/O thread (errno = %d) - " |
| 1181 | "falling back to synchronous I/O\n", -io_pid); |
| 1182 | io_pid = -1; |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 1183 | return 0; |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1184 | } |
Jeff Dike | 6c29256c | 2006-03-27 01:14:37 -0800 | [diff] [blame] | 1185 | err = um_request_irq(UBD_IRQ, thread_fd, IRQ_READ, ubd_intr, |
Yong Zhang | c0b79a9 | 2011-09-22 16:58:46 +0800 | [diff] [blame] | 1186 | 0, "ubd", ubd_devs); |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1187 | if(err != 0) |
| 1188 | printk(KERN_ERR "um_request_irq failed - errno = %d\n", -err); |
Jeff Dike | f4c57a7 | 2006-03-31 02:30:10 -0800 | [diff] [blame] | 1189 | return 0; |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1190 | } |
| 1191 | |
| 1192 | device_initcall(ubd_driver_init); |
| 1193 | |
Al Viro | a625c99 | 2008-03-02 09:16:26 -0500 | [diff] [blame] | 1194 | static int ubd_open(struct block_device *bdev, fmode_t mode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1195 | { |
Al Viro | a625c99 | 2008-03-02 09:16:26 -0500 | [diff] [blame] | 1196 | struct gendisk *disk = bdev->bd_disk; |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 1197 | struct ubd *ubd_dev = disk->private_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1198 | int err = 0; |
| 1199 | |
Arnd Bergmann | 9a181c5 | 2010-09-11 18:38:03 +0200 | [diff] [blame] | 1200 | mutex_lock(&ubd_mutex); |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 1201 | if(ubd_dev->count == 0){ |
| 1202 | err = ubd_open_dev(ubd_dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1203 | if(err){ |
| 1204 | printk(KERN_ERR "%s: Can't open \"%s\": errno = %d\n", |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 1205 | disk->disk_name, ubd_dev->file, -err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1206 | goto out; |
| 1207 | } |
| 1208 | } |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 1209 | ubd_dev->count++; |
| 1210 | set_disk_ro(disk, !ubd_dev->openflags.w); |
Paolo 'Blaisorblade' Giarrusso | 2c49be9 | 2005-05-01 08:58:57 -0700 | [diff] [blame] | 1211 | |
| 1212 | /* This should no more be needed. And it didn't work anyway to exclude |
| 1213 | * read-write remounting of filesystems.*/ |
Al Viro | a625c99 | 2008-03-02 09:16:26 -0500 | [diff] [blame] | 1214 | /*if((mode & FMODE_WRITE) && !ubd_dev->openflags.w){ |
Paolo 'Blaisorblade' Giarrusso | 5f75a4f | 2006-10-30 22:07:06 -0800 | [diff] [blame] | 1215 | if(--ubd_dev->count == 0) ubd_close_dev(ubd_dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1216 | err = -EROFS; |
Paolo 'Blaisorblade' Giarrusso | 2c49be9 | 2005-05-01 08:58:57 -0700 | [diff] [blame] | 1217 | }*/ |
Arnd Bergmann | 6e9624b | 2010-08-07 18:25:34 +0200 | [diff] [blame] | 1218 | out: |
Arnd Bergmann | 9a181c5 | 2010-09-11 18:38:03 +0200 | [diff] [blame] | 1219 | mutex_unlock(&ubd_mutex); |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 1220 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1221 | } |
| 1222 | |
Al Viro | db2a144 | 2013-05-05 21:52:57 -0400 | [diff] [blame] | 1223 | static void ubd_release(struct gendisk *disk, fmode_t mode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1224 | { |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 1225 | struct ubd *ubd_dev = disk->private_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1226 | |
Arnd Bergmann | 9a181c5 | 2010-09-11 18:38:03 +0200 | [diff] [blame] | 1227 | mutex_lock(&ubd_mutex); |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 1228 | if(--ubd_dev->count == 0) |
Paolo 'Blaisorblade' Giarrusso | 5f75a4f | 2006-10-30 22:07:06 -0800 | [diff] [blame] | 1229 | ubd_close_dev(ubd_dev); |
Arnd Bergmann | 9a181c5 | 2010-09-11 18:38:03 +0200 | [diff] [blame] | 1230 | mutex_unlock(&ubd_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1231 | } |
| 1232 | |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1233 | static void cowify_bitmap(__u64 io_offset, int length, unsigned long *cow_mask, |
| 1234 | __u64 *cow_offset, unsigned long *bitmap, |
| 1235 | __u64 bitmap_offset, unsigned long *bitmap_words, |
| 1236 | __u64 bitmap_len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1237 | { |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1238 | __u64 sector = io_offset >> 9; |
| 1239 | int i, update_bitmap = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1240 | |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1241 | for(i = 0; i < length >> 9; i++){ |
| 1242 | if(cow_mask != NULL) |
| 1243 | ubd_set_bit(i, (unsigned char *) cow_mask); |
| 1244 | if(ubd_test_bit(sector + i, (unsigned char *) bitmap)) |
| 1245 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1246 | |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1247 | update_bitmap = 1; |
| 1248 | ubd_set_bit(sector + i, (unsigned char *) bitmap); |
| 1249 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1250 | |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1251 | if(!update_bitmap) |
| 1252 | return; |
| 1253 | |
| 1254 | *cow_offset = sector / (sizeof(unsigned long) * 8); |
| 1255 | |
| 1256 | /* This takes care of the case where we're exactly at the end of the |
| 1257 | * device, and *cow_offset + 1 is off the end. So, just back it up |
| 1258 | * by one word. Thanks to Lynn Kerby for the fix and James McMechan |
| 1259 | * for the original diagnosis. |
| 1260 | */ |
Jiri Olsa | 6d07424 | 2008-05-12 14:01:56 -0700 | [diff] [blame] | 1261 | if (*cow_offset == (DIV_ROUND_UP(bitmap_len, |
| 1262 | sizeof(unsigned long)) - 1)) |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1263 | (*cow_offset)--; |
| 1264 | |
| 1265 | bitmap_words[0] = bitmap[*cow_offset]; |
| 1266 | bitmap_words[1] = bitmap[*cow_offset + 1]; |
| 1267 | |
| 1268 | *cow_offset *= sizeof(unsigned long); |
| 1269 | *cow_offset += bitmap_offset; |
| 1270 | } |
| 1271 | |
| 1272 | static void cowify_req(struct io_thread_req *req, unsigned long *bitmap, |
| 1273 | __u64 bitmap_offset, __u64 bitmap_len) |
| 1274 | { |
| 1275 | __u64 sector = req->offset >> 9; |
| 1276 | int i; |
| 1277 | |
| 1278 | if(req->length > (sizeof(req->sector_mask) * 8) << 9) |
| 1279 | panic("Operation too long"); |
| 1280 | |
| 1281 | if(req->op == UBD_READ) { |
| 1282 | for(i = 0; i < req->length >> 9; i++){ |
| 1283 | if(ubd_test_bit(sector + i, (unsigned char *) bitmap)) |
Jeff Dike | 6c29256c | 2006-03-27 01:14:37 -0800 | [diff] [blame] | 1284 | ubd_set_bit(i, (unsigned char *) |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1285 | &req->sector_mask); |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 1286 | } |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1287 | } |
| 1288 | else cowify_bitmap(req->offset, req->length, &req->sector_mask, |
| 1289 | &req->cow_offset, bitmap, bitmap_offset, |
| 1290 | req->bitmap_words, bitmap_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1291 | } |
| 1292 | |
Jeff Dike | 62f96cb | 2007-02-10 01:44:16 -0800 | [diff] [blame] | 1293 | /* Called with dev->lock held */ |
Jeff Dike | a0044bd | 2007-05-06 14:51:36 -0700 | [diff] [blame] | 1294 | static void prepare_request(struct request *req, struct io_thread_req *io_req, |
| 1295 | unsigned long long offset, int page_offset, |
| 1296 | int len, struct page *page) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1297 | { |
| 1298 | struct gendisk *disk = req->rq_disk; |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 1299 | struct ubd *ubd_dev = disk->private_data; |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1300 | |
Jeff Dike | 62f96cb | 2007-02-10 01:44:16 -0800 | [diff] [blame] | 1301 | io_req->req = req; |
Jeff Dike | a0044bd | 2007-05-06 14:51:36 -0700 | [diff] [blame] | 1302 | io_req->fds[0] = (ubd_dev->cow.file != NULL) ? ubd_dev->cow.fd : |
| 1303 | ubd_dev->fd; |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 1304 | io_req->fds[1] = ubd_dev->fd; |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1305 | io_req->cow_offset = -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1306 | io_req->offset = offset; |
| 1307 | io_req->length = len; |
| 1308 | io_req->error = 0; |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1309 | io_req->sector_mask = 0; |
| 1310 | |
| 1311 | io_req->op = (rq_data_dir(req) == READ) ? UBD_READ : UBD_WRITE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1312 | io_req->offsets[0] = 0; |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 1313 | io_req->offsets[1] = ubd_dev->cow.data_offset; |
Jeff Dike | a0044bd | 2007-05-06 14:51:36 -0700 | [diff] [blame] | 1314 | io_req->buffer = page_address(page) + page_offset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1315 | io_req->sectorsize = 1 << 9; |
| 1316 | |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 1317 | if(ubd_dev->cow.file != NULL) |
Jeff Dike | a0044bd | 2007-05-06 14:51:36 -0700 | [diff] [blame] | 1318 | cowify_req(io_req, ubd_dev->cow.bitmap, |
| 1319 | ubd_dev->cow.bitmap_offset, ubd_dev->cow.bitmap_len); |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1320 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1321 | } |
| 1322 | |
Jeff Dike | 62f96cb | 2007-02-10 01:44:16 -0800 | [diff] [blame] | 1323 | /* Called with dev->lock held */ |
Richard Weinberger | 805f11a | 2013-08-18 13:30:06 +0200 | [diff] [blame] | 1324 | static void prepare_flush_request(struct request *req, |
| 1325 | struct io_thread_req *io_req) |
| 1326 | { |
| 1327 | struct gendisk *disk = req->rq_disk; |
| 1328 | struct ubd *ubd_dev = disk->private_data; |
| 1329 | |
| 1330 | io_req->req = req; |
| 1331 | io_req->fds[0] = (ubd_dev->cow.file != NULL) ? ubd_dev->cow.fd : |
| 1332 | ubd_dev->fd; |
| 1333 | io_req->op = UBD_FLUSH; |
| 1334 | } |
| 1335 | |
Richard Weinberger | bc1d72e | 2013-08-18 13:30:07 +0200 | [diff] [blame] | 1336 | static bool submit_request(struct io_thread_req *io_req, struct ubd *dev) |
| 1337 | { |
| 1338 | int n = os_write_file(thread_fd, &io_req, |
| 1339 | sizeof(io_req)); |
| 1340 | if (n != sizeof(io_req)) { |
| 1341 | if (n != -EAGAIN) |
| 1342 | printk("write to io thread failed, " |
| 1343 | "errno = %d\n", -n); |
| 1344 | else if (list_empty(&dev->restart)) |
| 1345 | list_add(&dev->restart, &restart); |
| 1346 | |
| 1347 | kfree(io_req); |
| 1348 | return false; |
| 1349 | } |
| 1350 | return true; |
| 1351 | } |
| 1352 | |
Richard Weinberger | 805f11a | 2013-08-18 13:30:06 +0200 | [diff] [blame] | 1353 | /* Called with dev->lock held */ |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 1354 | static void do_ubd_request(struct request_queue *q) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1355 | { |
Jeff Dike | 2adcec2 | 2007-05-06 14:51:37 -0700 | [diff] [blame] | 1356 | struct io_thread_req *io_req; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1357 | struct request *req; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1358 | |
Jeff Dike | a0044bd | 2007-05-06 14:51:36 -0700 | [diff] [blame] | 1359 | while(1){ |
Jeff Dike | 2a9529a | 2007-03-29 01:20:27 -0700 | [diff] [blame] | 1360 | struct ubd *dev = q->queuedata; |
Thorsten Knabe | 2a23612 | 2014-08-23 15:47:38 +0200 | [diff] [blame] | 1361 | if(dev->request == NULL){ |
Tejun Heo | 9934c8c | 2009-05-08 11:54:16 +0900 | [diff] [blame] | 1362 | struct request *req = blk_fetch_request(q); |
Jeff Dike | a0044bd | 2007-05-06 14:51:36 -0700 | [diff] [blame] | 1363 | if(req == NULL) |
| 1364 | return; |
| 1365 | |
| 1366 | dev->request = req; |
Tejun Heo | 4752690 | 2010-10-15 12:56:21 +0200 | [diff] [blame] | 1367 | dev->rq_pos = blk_rq_pos(req); |
Jeff Dike | a0044bd | 2007-05-06 14:51:36 -0700 | [diff] [blame] | 1368 | dev->start_sg = 0; |
| 1369 | dev->end_sg = blk_rq_map_sg(q, req, dev->sg); |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1370 | } |
Jeff Dike | a0044bd | 2007-05-06 14:51:36 -0700 | [diff] [blame] | 1371 | |
| 1372 | req = dev->request; |
Richard Weinberger | 805f11a | 2013-08-18 13:30:06 +0200 | [diff] [blame] | 1373 | |
Mike Christie | 3a5e02c | 2016-06-05 14:32:23 -0500 | [diff] [blame] | 1374 | if (req_op(req) == REQ_OP_FLUSH) { |
Richard Weinberger | 805f11a | 2013-08-18 13:30:06 +0200 | [diff] [blame] | 1375 | io_req = kmalloc(sizeof(struct io_thread_req), |
| 1376 | GFP_ATOMIC); |
| 1377 | if (io_req == NULL) { |
| 1378 | if (list_empty(&dev->restart)) |
| 1379 | list_add(&dev->restart, &restart); |
| 1380 | return; |
| 1381 | } |
| 1382 | prepare_flush_request(req, io_req); |
Thorsten Knabe | 2a23612 | 2014-08-23 15:47:38 +0200 | [diff] [blame] | 1383 | if (submit_request(io_req, dev) == false) |
| 1384 | return; |
Richard Weinberger | 805f11a | 2013-08-18 13:30:06 +0200 | [diff] [blame] | 1385 | } |
| 1386 | |
Jeff Dike | a0044bd | 2007-05-06 14:51:36 -0700 | [diff] [blame] | 1387 | while(dev->start_sg < dev->end_sg){ |
| 1388 | struct scatterlist *sg = &dev->sg[dev->start_sg]; |
| 1389 | |
Jeff Dike | 2adcec2 | 2007-05-06 14:51:37 -0700 | [diff] [blame] | 1390 | io_req = kmalloc(sizeof(struct io_thread_req), |
Peter Zijlstra | 990c558 | 2007-05-06 14:51:38 -0700 | [diff] [blame] | 1391 | GFP_ATOMIC); |
Jeff Dike | 2adcec2 | 2007-05-06 14:51:37 -0700 | [diff] [blame] | 1392 | if(io_req == NULL){ |
| 1393 | if(list_empty(&dev->restart)) |
| 1394 | list_add(&dev->restart, &restart); |
| 1395 | return; |
| 1396 | } |
| 1397 | prepare_request(req, io_req, |
Tejun Heo | 4752690 | 2010-10-15 12:56:21 +0200 | [diff] [blame] | 1398 | (unsigned long long)dev->rq_pos << 9, |
Jens Axboe | 45711f1 | 2007-10-22 21:19:53 +0200 | [diff] [blame] | 1399 | sg->offset, sg->length, sg_page(sg)); |
Jeff Dike | a0044bd | 2007-05-06 14:51:36 -0700 | [diff] [blame] | 1400 | |
Richard Weinberger | bc1d72e | 2013-08-18 13:30:07 +0200 | [diff] [blame] | 1401 | if (submit_request(io_req, dev) == false) |
Jeff Dike | a0044bd | 2007-05-06 14:51:36 -0700 | [diff] [blame] | 1402 | return; |
Jeff Dike | a0044bd | 2007-05-06 14:51:36 -0700 | [diff] [blame] | 1403 | |
Tejun Heo | 4752690 | 2010-10-15 12:56:21 +0200 | [diff] [blame] | 1404 | dev->rq_pos += sg->length >> 9; |
Jeff Dike | a0044bd | 2007-05-06 14:51:36 -0700 | [diff] [blame] | 1405 | dev->start_sg++; |
| 1406 | } |
| 1407 | dev->end_sg = 0; |
| 1408 | dev->request = NULL; |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1409 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1410 | } |
| 1411 | |
Christoph Hellwig | a885c8c | 2006-01-08 01:02:50 -0800 | [diff] [blame] | 1412 | static int ubd_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
| 1413 | { |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 1414 | struct ubd *ubd_dev = bdev->bd_disk->private_data; |
Christoph Hellwig | a885c8c | 2006-01-08 01:02:50 -0800 | [diff] [blame] | 1415 | |
| 1416 | geo->heads = 128; |
| 1417 | geo->sectors = 32; |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 1418 | geo->cylinders = ubd_dev->size / (128 * 32 * 512); |
Christoph Hellwig | a885c8c | 2006-01-08 01:02:50 -0800 | [diff] [blame] | 1419 | return 0; |
| 1420 | } |
| 1421 | |
Al Viro | a625c99 | 2008-03-02 09:16:26 -0500 | [diff] [blame] | 1422 | static int ubd_ioctl(struct block_device *bdev, fmode_t mode, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1423 | unsigned int cmd, unsigned long arg) |
| 1424 | { |
Al Viro | a625c99 | 2008-03-02 09:16:26 -0500 | [diff] [blame] | 1425 | struct ubd *ubd_dev = bdev->bd_disk->private_data; |
Bartlomiej Zolnierkiewicz | 73855e1 | 2009-04-01 21:42:21 +0200 | [diff] [blame] | 1426 | u16 ubd_id[ATA_ID_WORDS]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1427 | |
| 1428 | switch (cmd) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1429 | struct cdrom_volctrl volume; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1430 | case HDIO_GET_IDENTITY: |
Bartlomiej Zolnierkiewicz | 73855e1 | 2009-04-01 21:42:21 +0200 | [diff] [blame] | 1431 | memset(&ubd_id, 0, ATA_ID_WORDS * 2); |
| 1432 | ubd_id[ATA_ID_CYLS] = ubd_dev->size / (128 * 32 * 512); |
| 1433 | ubd_id[ATA_ID_HEADS] = 128; |
| 1434 | ubd_id[ATA_ID_SECTORS] = 32; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1435 | if(copy_to_user((char __user *) arg, (char *) &ubd_id, |
| 1436 | sizeof(ubd_id))) |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 1437 | return -EFAULT; |
| 1438 | return 0; |
Jeff Dike | b8831a1 | 2007-02-10 01:44:17 -0800 | [diff] [blame] | 1439 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1440 | case CDROMVOLREAD: |
| 1441 | if(copy_from_user(&volume, (char __user *) arg, sizeof(volume))) |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 1442 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1443 | volume.channel0 = 255; |
| 1444 | volume.channel1 = 255; |
| 1445 | volume.channel2 = 255; |
| 1446 | volume.channel3 = 255; |
| 1447 | if(copy_to_user((char __user *) arg, &volume, sizeof(volume))) |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 1448 | return -EFAULT; |
| 1449 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1450 | } |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 1451 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1452 | } |
| 1453 | |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1454 | static int update_bitmap(struct io_thread_req *req) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1455 | { |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1456 | int n; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1457 | |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1458 | if(req->cow_offset == -1) |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 1459 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1460 | |
Anton Ivanov | 8c6157b | 2015-12-21 18:54:00 +0000 | [diff] [blame] | 1461 | n = os_pwrite_file(req->fds[1], &req->bitmap_words, |
| 1462 | sizeof(req->bitmap_words), req->cow_offset); |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1463 | if(n != sizeof(req->bitmap_words)){ |
| 1464 | printk("do_io - bitmap update failed, err = %d fd = %d\n", -n, |
| 1465 | req->fds[1]); |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 1466 | return 1; |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1467 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1468 | |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 1469 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1470 | } |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1471 | |
WANG Cong | 5dc62b1 | 2008-04-28 02:13:58 -0700 | [diff] [blame] | 1472 | static void do_io(struct io_thread_req *req) |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1473 | { |
| 1474 | char *buf; |
| 1475 | unsigned long len; |
| 1476 | int n, nsectors, start, end, bit; |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1477 | __u64 off; |
| 1478 | |
Richard Weinberger | 805f11a | 2013-08-18 13:30:06 +0200 | [diff] [blame] | 1479 | if (req->op == UBD_FLUSH) { |
| 1480 | /* fds[0] is always either the rw image or our cow file */ |
| 1481 | n = os_sync_file(req->fds[0]); |
| 1482 | if (n != 0) { |
| 1483 | printk("do_io - sync failed err = %d " |
| 1484 | "fd = %d\n", -n, req->fds[0]); |
| 1485 | req->error = 1; |
| 1486 | } |
| 1487 | return; |
| 1488 | } |
| 1489 | |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1490 | nsectors = req->length / req->sectorsize; |
| 1491 | start = 0; |
| 1492 | do { |
| 1493 | bit = ubd_test_bit(start, (unsigned char *) &req->sector_mask); |
| 1494 | end = start; |
| 1495 | while((end < nsectors) && |
| 1496 | (ubd_test_bit(end, (unsigned char *) |
| 1497 | &req->sector_mask) == bit)) |
| 1498 | end++; |
| 1499 | |
| 1500 | off = req->offset + req->offsets[bit] + |
| 1501 | start * req->sectorsize; |
| 1502 | len = (end - start) * req->sectorsize; |
| 1503 | buf = &req->buffer[start * req->sectorsize]; |
| 1504 | |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1505 | if(req->op == UBD_READ){ |
| 1506 | n = 0; |
| 1507 | do { |
| 1508 | buf = &buf[n]; |
| 1509 | len -= n; |
Anton Ivanov | 8c6157b | 2015-12-21 18:54:00 +0000 | [diff] [blame] | 1510 | n = os_pread_file(req->fds[bit], buf, len, off); |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1511 | if (n < 0) { |
| 1512 | printk("do_io - read failed, err = %d " |
| 1513 | "fd = %d\n", -n, req->fds[bit]); |
| 1514 | req->error = 1; |
| 1515 | return; |
| 1516 | } |
| 1517 | } while((n < len) && (n != 0)); |
| 1518 | if (n < len) memset(&buf[n], 0, len - n); |
| 1519 | } else { |
Anton Ivanov | 8c6157b | 2015-12-21 18:54:00 +0000 | [diff] [blame] | 1520 | n = os_pwrite_file(req->fds[bit], buf, len, off); |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1521 | if(n != len){ |
| 1522 | printk("do_io - write failed err = %d " |
| 1523 | "fd = %d\n", -n, req->fds[bit]); |
| 1524 | req->error = 1; |
| 1525 | return; |
| 1526 | } |
| 1527 | } |
| 1528 | |
| 1529 | start = end; |
| 1530 | } while(start < nsectors); |
| 1531 | |
| 1532 | req->error = update_bitmap(req); |
| 1533 | } |
| 1534 | |
| 1535 | /* Changed in start_io_thread, which is serialized by being called only |
| 1536 | * from ubd_init, which is an initcall. |
| 1537 | */ |
| 1538 | int kernel_fd = -1; |
| 1539 | |
Paolo 'Blaisorblade' Giarrusso | d8d7c28 | 2006-10-30 22:07:12 -0800 | [diff] [blame] | 1540 | /* Only changed by the io thread. XXX: currently unused. */ |
| 1541 | static int io_count = 0; |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1542 | |
| 1543 | int io_thread(void *arg) |
| 1544 | { |
Anton Ivanov | f88f0bd | 2016-11-09 20:43:25 +0000 | [diff] [blame] | 1545 | int n, count, written, res; |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1546 | |
Richard Weinberger | 91d44ff | 2013-08-18 13:30:08 +0200 | [diff] [blame] | 1547 | os_fix_helper_signals(); |
| 1548 | |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1549 | while(1){ |
Anton Ivanov | f88f0bd | 2016-11-09 20:43:25 +0000 | [diff] [blame] | 1550 | n = bulk_req_safe_read( |
| 1551 | kernel_fd, |
| 1552 | io_req_buffer, |
| 1553 | &io_remainder, |
| 1554 | &io_remainder_size, |
| 1555 | UBD_REQ_BUFFER_SIZE |
| 1556 | ); |
| 1557 | if (n < 0) { |
| 1558 | if (n == -EAGAIN) { |
| 1559 | ubd_read_poll(-1); |
| 1560 | continue; |
| 1561 | } else { |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1562 | printk("io_thread - read failed, fd = %d, " |
Anton Ivanov | f88f0bd | 2016-11-09 20:43:25 +0000 | [diff] [blame] | 1563 | "err = %d," |
| 1564 | "reminder = %d\n", |
| 1565 | kernel_fd, -n, io_remainder_size); |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1566 | } |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1567 | } |
Anton Ivanov | f88f0bd | 2016-11-09 20:43:25 +0000 | [diff] [blame] | 1568 | |
| 1569 | for (count = 0; count < n/sizeof(struct io_thread_req *); count++) { |
| 1570 | io_count++; |
| 1571 | do_io((*io_req_buffer)[count]); |
| 1572 | } |
| 1573 | |
| 1574 | written = 0; |
| 1575 | |
| 1576 | do { |
| 1577 | res = os_write_file(kernel_fd, ((char *) io_req_buffer) + written, n); |
Anton Ivanov | ff6a179 | 2017-11-20 21:17:58 +0000 | [diff] [blame] | 1578 | if (res >= 0) { |
Anton Ivanov | f88f0bd | 2016-11-09 20:43:25 +0000 | [diff] [blame] | 1579 | written += res; |
| 1580 | } else { |
| 1581 | if (res != -EAGAIN) { |
Anton Ivanov | ff6a179 | 2017-11-20 21:17:58 +0000 | [diff] [blame] | 1582 | printk("io_thread - write failed, fd = %d, " |
Anton Ivanov | f88f0bd | 2016-11-09 20:43:25 +0000 | [diff] [blame] | 1583 | "err = %d\n", kernel_fd, -n); |
| 1584 | } |
| 1585 | } |
| 1586 | if (written < n) { |
| 1587 | ubd_write_poll(-1); |
| 1588 | } |
| 1589 | } while (written < n); |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1590 | } |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1591 | |
Jeff Dike | 1b57e9c | 2006-01-06 00:18:49 -0800 | [diff] [blame] | 1592 | return 0; |
| 1593 | } |