Jeff Dike | 6c29256c | 2006-03-27 01:14:37 -0800 | [diff] [blame] | 1 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | * Copyright (C) 2000 Jeff Dike (jdike@karaya.com) |
| 3 | * Licensed under the GPL |
| 4 | */ |
| 5 | |
| 6 | /* 2001-09-28...2002-04-17 |
| 7 | * Partition stuff by James_McMechan@hotmail.com |
| 8 | * old style ubd by setting UBD_SHIFT to 0 |
| 9 | * 2002-09-27...2002-10-18 massive tinkering for 2.5 |
| 10 | * partitions have changed in 2.5 |
| 11 | * 2003-01-29 more tinkering for 2.5.59-1 |
| 12 | * This should now address the sysfs problems and has |
| 13 | * the symlink for devfs to allow for booting with |
| 14 | * the common /dev/ubd/discX/... names rather than |
| 15 | * only /dev/ubdN/discN this version also has lots of |
| 16 | * clean ups preparing for ubd-many. |
| 17 | * James McMechan |
| 18 | */ |
| 19 | |
| 20 | #define MAJOR_NR UBD_MAJOR |
| 21 | #define UBD_SHIFT 4 |
| 22 | |
Jeff Dike | e16f535 | 2007-06-08 13:46:54 -0700 | [diff] [blame] | 23 | #include "linux/kernel.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | #include "linux/module.h" |
| 25 | #include "linux/blkdev.h" |
| 26 | #include "linux/hdreg.h" |
| 27 | #include "linux/init.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | #include "linux/cdrom.h" |
| 29 | #include "linux/proc_fs.h" |
| 30 | #include "linux/ctype.h" |
| 31 | #include "linux/capability.h" |
| 32 | #include "linux/mm.h" |
| 33 | #include "linux/vmalloc.h" |
| 34 | #include "linux/blkpg.h" |
| 35 | #include "linux/genhd.h" |
| 36 | #include "linux/spinlock.h" |
Russell King | d052d1b | 2005-10-29 19:07:23 +0100 | [diff] [blame] | 37 | #include "linux/platform_device.h" |
WANG Cong | 23464ff | 2007-10-24 13:07:11 +0200 | [diff] [blame] | 38 | #include "linux/scatterlist.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | #include "asm/segment.h" |
| 40 | #include "asm/uaccess.h" |
| 41 | #include "asm/irq.h" |
| 42 | #include "asm/types.h" |
| 43 | #include "asm/tlbflush.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | #include "mem_user.h" |
| 45 | #include "kern_util.h" |
| 46 | #include "kern.h" |
| 47 | #include "mconsole_kern.h" |
| 48 | #include "init.h" |
| 49 | #include "irq_user.h" |
| 50 | #include "irq_kern.h" |
| 51 | #include "ubd_user.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | #include "os.h" |
| 53 | #include "mem.h" |
| 54 | #include "mem_kern.h" |
| 55 | #include "cow.h" |
| 56 | |
Jeff Dike | 7b9014c | 2005-05-20 13:59:11 -0700 | [diff] [blame] | 57 | enum ubd_req { UBD_READ, UBD_WRITE }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | |
| 59 | struct io_thread_req { |
Jeff Dike | 62f96cb | 2007-02-10 01:44:16 -0800 | [diff] [blame] | 60 | struct request *req; |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 61 | enum ubd_req op; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | int fds[2]; |
| 63 | unsigned long offsets[2]; |
| 64 | unsigned long long offset; |
| 65 | unsigned long length; |
| 66 | char *buffer; |
| 67 | int sectorsize; |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 68 | unsigned long sector_mask; |
| 69 | unsigned long long cow_offset; |
| 70 | unsigned long bitmap_words[2]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | int error; |
| 72 | }; |
| 73 | |
Jeff Dike | 6c29256c | 2006-03-27 01:14:37 -0800 | [diff] [blame] | 74 | extern int open_ubd_file(char *file, struct openflags *openflags, int shared, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | char **backing_file_out, int *bitmap_offset_out, |
| 76 | unsigned long *bitmap_len_out, int *data_offset_out, |
| 77 | int *create_cow_out); |
| 78 | extern int create_cow_file(char *cow_file, char *backing_file, |
| 79 | struct openflags flags, int sectorsize, |
| 80 | int alignment, int *bitmap_offset_out, |
| 81 | unsigned long *bitmap_len_out, |
| 82 | int *data_offset_out); |
| 83 | extern int read_cow_bitmap(int fd, void *buf, int offset, int len); |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 84 | extern void do_io(struct io_thread_req *req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 86 | static inline int ubd_test_bit(__u64 bit, unsigned char *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | { |
| 88 | __u64 n; |
| 89 | int bits, off; |
| 90 | |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 91 | bits = sizeof(data[0]) * 8; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | n = bit / bits; |
| 93 | off = bit % bits; |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 94 | return (data[n] & (1 << off)) != 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | } |
| 96 | |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 97 | static inline void ubd_set_bit(__u64 bit, unsigned char *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | { |
| 99 | __u64 n; |
| 100 | int bits, off; |
| 101 | |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 102 | bits = sizeof(data[0]) * 8; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | n = bit / bits; |
| 104 | off = bit % bits; |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 105 | data[n] |= (1 << off); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | } |
| 107 | /*End stuff from ubd_user.h*/ |
| 108 | |
| 109 | #define DRIVER_NAME "uml-blkdev" |
| 110 | |
Paolo 'Blaisorblade' Giarrusso | d7fb2c3 | 2006-10-30 22:07:07 -0800 | [diff] [blame] | 111 | static DEFINE_MUTEX(ubd_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 113 | static int ubd_open(struct inode * inode, struct file * filp); |
| 114 | static int ubd_release(struct inode * inode, struct file * file); |
| 115 | static int ubd_ioctl(struct inode * inode, struct file * file, |
| 116 | unsigned int cmd, unsigned long arg); |
Christoph Hellwig | a885c8c | 2006-01-08 01:02:50 -0800 | [diff] [blame] | 117 | static int ubd_getgeo(struct block_device *bdev, struct hd_geometry *geo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | |
Paolo 'Blaisorblade' Giarrusso | 97d88ac | 2006-10-30 22:07:03 -0800 | [diff] [blame] | 119 | #define MAX_DEV (16) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | static struct block_device_operations ubd_blops = { |
| 122 | .owner = THIS_MODULE, |
| 123 | .open = ubd_open, |
| 124 | .release = ubd_release, |
| 125 | .ioctl = ubd_ioctl, |
Christoph Hellwig | a885c8c | 2006-01-08 01:02:50 -0800 | [diff] [blame] | 126 | .getgeo = ubd_getgeo, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | }; |
| 128 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 129 | /* Protected by ubd_lock */ |
| 130 | static int fake_major = MAJOR_NR; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 131 | static struct gendisk *ubd_gendisk[MAX_DEV]; |
| 132 | static struct gendisk *fake_gendisk[MAX_DEV]; |
Jeff Dike | 6c29256c | 2006-03-27 01:14:37 -0800 | [diff] [blame] | 133 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | #ifdef CONFIG_BLK_DEV_UBD_SYNC |
| 135 | #define OPEN_FLAGS ((struct openflags) { .r = 1, .w = 1, .s = 1, .c = 0, \ |
| 136 | .cl = 1 }) |
| 137 | #else |
| 138 | #define OPEN_FLAGS ((struct openflags) { .r = 1, .w = 1, .s = 0, .c = 0, \ |
| 139 | .cl = 1 }) |
| 140 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 141 | static struct openflags global_openflags = OPEN_FLAGS; |
| 142 | |
| 143 | struct cow { |
Paolo 'Blaisorblade' Giarrusso | 2a9d32f | 2006-10-30 22:07:04 -0800 | [diff] [blame] | 144 | /* backing file name */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 145 | char *file; |
Paolo 'Blaisorblade' Giarrusso | 2a9d32f | 2006-10-30 22:07:04 -0800 | [diff] [blame] | 146 | /* backing file fd */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | int fd; |
| 148 | unsigned long *bitmap; |
| 149 | unsigned long bitmap_len; |
| 150 | int bitmap_offset; |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 151 | int data_offset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | }; |
| 153 | |
Jeff Dike | a0044bd | 2007-05-06 14:51:36 -0700 | [diff] [blame] | 154 | #define MAX_SG 64 |
| 155 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | struct ubd { |
Jeff Dike | a0044bd | 2007-05-06 14:51:36 -0700 | [diff] [blame] | 157 | struct list_head restart; |
Paolo 'Blaisorblade' Giarrusso | 2a9d32f | 2006-10-30 22:07:04 -0800 | [diff] [blame] | 158 | /* name (and fd, below) of the file opened for writing, either the |
| 159 | * backing or the cow file. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | char *file; |
| 161 | int count; |
| 162 | int fd; |
| 163 | __u64 size; |
| 164 | struct openflags boot_openflags; |
| 165 | struct openflags openflags; |
Paolo 'Blaisorblade' Giarrusso | 84e945e | 2006-10-30 22:07:10 -0800 | [diff] [blame] | 166 | unsigned shared:1; |
| 167 | unsigned no_cow:1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | struct cow cow; |
| 169 | struct platform_device pdev; |
Jeff Dike | 62f96cb | 2007-02-10 01:44:16 -0800 | [diff] [blame] | 170 | struct request_queue *queue; |
| 171 | spinlock_t lock; |
Jeff Dike | a0044bd | 2007-05-06 14:51:36 -0700 | [diff] [blame] | 172 | struct scatterlist sg[MAX_SG]; |
| 173 | struct request *request; |
| 174 | int start_sg, end_sg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 175 | }; |
| 176 | |
| 177 | #define DEFAULT_COW { \ |
| 178 | .file = NULL, \ |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 179 | .fd = -1, \ |
| 180 | .bitmap = NULL, \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 181 | .bitmap_offset = 0, \ |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 182 | .data_offset = 0, \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | } |
| 184 | |
| 185 | #define DEFAULT_UBD { \ |
| 186 | .file = NULL, \ |
| 187 | .count = 0, \ |
| 188 | .fd = -1, \ |
| 189 | .size = -1, \ |
| 190 | .boot_openflags = OPEN_FLAGS, \ |
| 191 | .openflags = OPEN_FLAGS, \ |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 192 | .no_cow = 0, \ |
Jeff Dike | 6c29256c | 2006-03-27 01:14:37 -0800 | [diff] [blame] | 193 | .shared = 0, \ |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 194 | .cow = DEFAULT_COW, \ |
Jeff Dike | 62f96cb | 2007-02-10 01:44:16 -0800 | [diff] [blame] | 195 | .lock = SPIN_LOCK_UNLOCKED, \ |
Jeff Dike | a0044bd | 2007-05-06 14:51:36 -0700 | [diff] [blame] | 196 | .request = NULL, \ |
| 197 | .start_sg = 0, \ |
| 198 | .end_sg = 0, \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | } |
| 200 | |
Jeff Dike | b8831a1 | 2007-02-10 01:44:17 -0800 | [diff] [blame] | 201 | /* Protected by ubd_lock */ |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 202 | struct ubd ubd_devs[MAX_DEV] = { [ 0 ... MAX_DEV - 1 ] = DEFAULT_UBD }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | /* Only changed by fake_ide_setup which is a setup */ |
| 205 | static int fake_ide = 0; |
| 206 | static struct proc_dir_entry *proc_ide_root = NULL; |
| 207 | static struct proc_dir_entry *proc_ide = NULL; |
| 208 | |
| 209 | static void make_proc_ide(void) |
| 210 | { |
| 211 | proc_ide_root = proc_mkdir("ide", NULL); |
| 212 | proc_ide = proc_mkdir("ide0", proc_ide_root); |
| 213 | } |
| 214 | |
| 215 | static int proc_ide_read_media(char *page, char **start, off_t off, int count, |
| 216 | int *eof, void *data) |
| 217 | { |
| 218 | int len; |
| 219 | |
| 220 | strcpy(page, "disk\n"); |
| 221 | len = strlen("disk\n"); |
| 222 | len -= off; |
| 223 | if (len < count){ |
| 224 | *eof = 1; |
| 225 | if (len <= 0) return 0; |
| 226 | } |
| 227 | else len = count; |
| 228 | *start = page + off; |
| 229 | return len; |
| 230 | } |
| 231 | |
| 232 | static void make_ide_entries(char *dev_name) |
| 233 | { |
| 234 | struct proc_dir_entry *dir, *ent; |
| 235 | char name[64]; |
| 236 | |
| 237 | if(proc_ide_root == NULL) make_proc_ide(); |
| 238 | |
| 239 | dir = proc_mkdir(dev_name, proc_ide); |
| 240 | if(!dir) return; |
| 241 | |
| 242 | ent = create_proc_entry("media", S_IFREG|S_IRUGO, dir); |
| 243 | if(!ent) return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | ent->data = NULL; |
| 245 | ent->read_proc = proc_ide_read_media; |
| 246 | ent->write_proc = NULL; |
| 247 | sprintf(name,"ide0/%s", dev_name); |
| 248 | proc_symlink(dev_name, proc_ide_root, name); |
| 249 | } |
| 250 | |
| 251 | static int fake_ide_setup(char *str) |
| 252 | { |
| 253 | fake_ide = 1; |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 254 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 255 | } |
| 256 | |
| 257 | __setup("fake_ide", fake_ide_setup); |
| 258 | |
| 259 | __uml_help(fake_ide_setup, |
| 260 | "fake_ide\n" |
| 261 | " Create ide0 entries that map onto ubd devices.\n\n" |
| 262 | ); |
| 263 | |
| 264 | static int parse_unit(char **ptr) |
| 265 | { |
| 266 | char *str = *ptr, *end; |
| 267 | int n = -1; |
| 268 | |
| 269 | if(isdigit(*str)) { |
| 270 | n = simple_strtoul(str, &end, 0); |
| 271 | if(end == str) |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 272 | return -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 273 | *ptr = end; |
| 274 | } |
Paolo 'Blaisorblade' Giarrusso | 97d88ac | 2006-10-30 22:07:03 -0800 | [diff] [blame] | 275 | else if (('a' <= *str) && (*str <= 'z')) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 276 | n = *str - 'a'; |
| 277 | str++; |
| 278 | *ptr = str; |
| 279 | } |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 280 | return n; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | } |
| 282 | |
Paolo 'Blaisorblade' Giarrusso | d8d7c28 | 2006-10-30 22:07:12 -0800 | [diff] [blame] | 283 | /* If *index_out == -1 at exit, the passed option was a general one; |
| 284 | * otherwise, the str pointer is used (and owned) inside ubd_devs array, so it |
| 285 | * should not be freed on exit. |
| 286 | */ |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 287 | 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] | 288 | { |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 289 | struct ubd *ubd_dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 290 | struct openflags flags = global_openflags; |
| 291 | char *backing_file; |
Jeff Dike | b8831a1 | 2007-02-10 01:44:17 -0800 | [diff] [blame] | 292 | int n, err = 0, i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 293 | |
| 294 | if(index_out) *index_out = -1; |
| 295 | n = *str; |
| 296 | if(n == '='){ |
| 297 | char *end; |
| 298 | int major; |
| 299 | |
| 300 | str++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 301 | if(!strcmp(str, "sync")){ |
| 302 | global_openflags = of_sync(global_openflags); |
Jeff Dike | b8831a1 | 2007-02-10 01:44:17 -0800 | [diff] [blame] | 303 | goto out1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | } |
| 305 | |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 306 | err = -EINVAL; |
Jeff Dike | b8831a1 | 2007-02-10 01:44:17 -0800 | [diff] [blame] | 307 | major = simple_strtoul(str, &end, 0); |
| 308 | if((*end != '\0') || (end == str)){ |
| 309 | *error_out = "Didn't parse major number"; |
| 310 | goto out1; |
| 311 | } |
| 312 | |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 313 | mutex_lock(&ubd_lock); |
| 314 | if(fake_major != MAJOR_NR){ |
| 315 | *error_out = "Can't assign a fake major twice"; |
| 316 | goto out1; |
| 317 | } |
Jeff Dike | 6c29256c | 2006-03-27 01:14:37 -0800 | [diff] [blame] | 318 | |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 319 | fake_major = major; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 320 | |
| 321 | printk(KERN_INFO "Setting extra ubd major number to %d\n", |
| 322 | major); |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 323 | err = 0; |
| 324 | out1: |
| 325 | mutex_unlock(&ubd_lock); |
| 326 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 327 | } |
| 328 | |
| 329 | n = parse_unit(&str); |
| 330 | if(n < 0){ |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 331 | *error_out = "Couldn't parse device number"; |
| 332 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 333 | } |
| 334 | if(n >= MAX_DEV){ |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 335 | *error_out = "Device number out of range"; |
| 336 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | } |
| 338 | |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 339 | err = -EBUSY; |
Paolo 'Blaisorblade' Giarrusso | d7fb2c3 | 2006-10-30 22:07:07 -0800 | [diff] [blame] | 340 | mutex_lock(&ubd_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 341 | |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 342 | ubd_dev = &ubd_devs[n]; |
| 343 | if(ubd_dev->file != NULL){ |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 344 | *error_out = "Device is already configured"; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 345 | goto out; |
| 346 | } |
| 347 | |
| 348 | if (index_out) |
| 349 | *index_out = n; |
| 350 | |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 351 | err = -EINVAL; |
Jeff Dike | 6c29256c | 2006-03-27 01:14:37 -0800 | [diff] [blame] | 352 | for (i = 0; i < sizeof("rscd="); i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 353 | switch (*str) { |
| 354 | case 'r': |
| 355 | flags.w = 0; |
| 356 | break; |
| 357 | case 's': |
| 358 | flags.s = 1; |
| 359 | break; |
| 360 | case 'd': |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 361 | ubd_dev->no_cow = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 362 | break; |
Jeff Dike | 6c29256c | 2006-03-27 01:14:37 -0800 | [diff] [blame] | 363 | case 'c': |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 364 | ubd_dev->shared = 1; |
Jeff Dike | 6c29256c | 2006-03-27 01:14:37 -0800 | [diff] [blame] | 365 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 366 | case '=': |
| 367 | str++; |
| 368 | goto break_loop; |
| 369 | default: |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 370 | *error_out = "Expected '=' or flag letter " |
| 371 | "(r, s, c, or d)"; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 372 | goto out; |
| 373 | } |
| 374 | str++; |
| 375 | } |
| 376 | |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 377 | if (*str == '=') |
| 378 | *error_out = "Too many flags specified"; |
| 379 | else |
| 380 | *error_out = "Missing '='"; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 381 | goto out; |
| 382 | |
| 383 | break_loop: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 384 | backing_file = strchr(str, ','); |
| 385 | |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 386 | if (backing_file == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 387 | backing_file = strchr(str, ':'); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 388 | |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 389 | if(backing_file != NULL){ |
| 390 | if(ubd_dev->no_cow){ |
| 391 | *error_out = "Can't specify both 'd' and a cow file"; |
| 392 | goto out; |
| 393 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 394 | else { |
| 395 | *backing_file = '\0'; |
| 396 | backing_file++; |
| 397 | } |
| 398 | } |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 399 | err = 0; |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 400 | ubd_dev->file = str; |
| 401 | ubd_dev->cow.file = backing_file; |
| 402 | ubd_dev->boot_openflags = flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 403 | out: |
Paolo 'Blaisorblade' Giarrusso | d7fb2c3 | 2006-10-30 22:07:07 -0800 | [diff] [blame] | 404 | mutex_unlock(&ubd_lock); |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 405 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 406 | } |
| 407 | |
| 408 | static int ubd_setup(char *str) |
| 409 | { |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 410 | char *error; |
| 411 | int err; |
| 412 | |
| 413 | err = ubd_setup_common(str, NULL, &error); |
| 414 | if(err) |
| 415 | printk(KERN_ERR "Failed to initialize device with \"%s\" : " |
| 416 | "%s\n", str, error); |
| 417 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 418 | } |
| 419 | |
| 420 | __setup("ubd", ubd_setup); |
| 421 | __uml_help(ubd_setup, |
| 422 | "ubd<n><flags>=<filename>[(:|,)<filename2>]\n" |
| 423 | " This is used to associate a device with a file in the underlying\n" |
| 424 | " filesystem. When specifying two filenames, the first one is the\n" |
| 425 | " COW name and the second is the backing file name. As separator you can\n" |
| 426 | " use either a ':' or a ',': the first one allows writing things like;\n" |
| 427 | " ubd0=~/Uml/root_cow:~/Uml/root_backing_file\n" |
| 428 | " while with a ',' the shell would not expand the 2nd '~'.\n" |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 429 | " 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] | 430 | " a COW file or a backing file. To override this detection, add the 'd'\n" |
| 431 | " flag:\n" |
| 432 | " ubd0d=BackingFile\n" |
| 433 | " Usually, there is a filesystem in the file, but \n" |
| 434 | " that's not required. Swap devices containing swap files can be\n" |
| 435 | " specified like this. Also, a file which doesn't contain a\n" |
| 436 | " filesystem can have its contents read in the virtual \n" |
| 437 | " machine by running 'dd' on the device. <n> must be in the range\n" |
| 438 | " 0 to 7. Appending an 'r' to the number will cause that device\n" |
| 439 | " to be mounted read-only. For example ubd1r=./ext_fs. Appending\n" |
| 440 | " an 's' will cause data to be written to disk on the host immediately.\n\n" |
| 441 | ); |
| 442 | |
| 443 | static int udb_setup(char *str) |
| 444 | { |
| 445 | printk("udb%s specified on command line is almost certainly a ubd -> " |
| 446 | "udb TYPO\n", str); |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 447 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 448 | } |
| 449 | |
| 450 | __setup("udb", udb_setup); |
| 451 | __uml_help(udb_setup, |
| 452 | "udb\n" |
Jeff Dike | 0894e27 | 2005-05-28 15:51:55 -0700 | [diff] [blame] | 453 | " This option is here solely to catch ubd -> udb typos, which can be\n" |
| 454 | " to impossible to catch visually unless you specifically look for\n" |
| 455 | " 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] | 456 | " in the boot output.\n\n" |
| 457 | ); |
| 458 | |
| 459 | static int fakehd_set = 0; |
| 460 | static int fakehd(char *str) |
| 461 | { |
| 462 | printk(KERN_INFO "fakehd : Changing ubd name to \"hd\".\n"); |
| 463 | fakehd_set = 1; |
| 464 | return 1; |
| 465 | } |
| 466 | |
| 467 | __setup("fakehd", fakehd); |
| 468 | __uml_help(fakehd, |
| 469 | "fakehd\n" |
| 470 | " Change the ubd device name to \"hd\".\n\n" |
| 471 | ); |
| 472 | |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 473 | static void do_ubd_request(struct request_queue * q); |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 474 | |
| 475 | /* Only changed by ubd_init, which is an initcall. */ |
| 476 | int thread_fd = -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 477 | |
Kiyoshi Ueda | 4898b53 | 2007-12-11 17:42:53 -0500 | [diff] [blame] | 478 | static void ubd_end_request(struct request *req, int bytes, int error) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 479 | { |
Kiyoshi Ueda | 4898b53 | 2007-12-11 17:42:53 -0500 | [diff] [blame] | 480 | blk_end_request(req, error, bytes); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 481 | } |
| 482 | |
Paolo 'Blaisorblade' Giarrusso | 33f775e | 2006-10-30 22:07:08 -0800 | [diff] [blame] | 483 | /* Callable only from interrupt context - otherwise you need to do |
| 484 | * spin_lock_irq()/spin_lock_irqsave() */ |
Jeff Dike | a0044bd | 2007-05-06 14:51:36 -0700 | [diff] [blame] | 485 | static inline void ubd_finish(struct request *req, int bytes) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 486 | { |
Jeff Dike | a0044bd | 2007-05-06 14:51:36 -0700 | [diff] [blame] | 487 | if(bytes < 0){ |
Kiyoshi Ueda | 4898b53 | 2007-12-11 17:42:53 -0500 | [diff] [blame] | 488 | ubd_end_request(req, 0, -EIO); |
Jeff Dike | a0044bd | 2007-05-06 14:51:36 -0700 | [diff] [blame] | 489 | return; |
| 490 | } |
Kiyoshi Ueda | 4898b53 | 2007-12-11 17:42:53 -0500 | [diff] [blame] | 491 | ubd_end_request(req, bytes, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 492 | } |
| 493 | |
Jeff Dike | a0044bd | 2007-05-06 14:51:36 -0700 | [diff] [blame] | 494 | static LIST_HEAD(restart); |
| 495 | |
Paolo 'Blaisorblade' Giarrusso | 2fe30a3 | 2006-10-30 22:07:09 -0800 | [diff] [blame] | 496 | /* XXX - move this inside ubd_intr. */ |
Jeff Dike | 62f96cb | 2007-02-10 01:44:16 -0800 | [diff] [blame] | 497 | /* Called without dev->lock held, and only in interrupt context. */ |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 498 | static void ubd_handler(void) |
| 499 | { |
Jeff Dike | 2adcec2 | 2007-05-06 14:51:37 -0700 | [diff] [blame] | 500 | struct io_thread_req *req; |
Jeff Dike | 62f96cb | 2007-02-10 01:44:16 -0800 | [diff] [blame] | 501 | struct request *rq; |
Jeff Dike | a0044bd | 2007-05-06 14:51:36 -0700 | [diff] [blame] | 502 | struct ubd *ubd; |
| 503 | struct list_head *list, *next_ele; |
| 504 | unsigned long flags; |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 505 | int n; |
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){ |
Jeff Dike | a6ea4cc | 2007-05-06 14:51:43 -0700 | [diff] [blame] | 508 | n = os_read_file(thread_fd, &req, |
| 509 | sizeof(struct io_thread_req *)); |
Jeff Dike | a0044bd | 2007-05-06 14:51:36 -0700 | [diff] [blame] | 510 | if(n != sizeof(req)){ |
| 511 | if(n == -EAGAIN) |
| 512 | break; |
| 513 | printk(KERN_ERR "spurious interrupt in ubd_handler, " |
| 514 | "err = %d\n", -n); |
| 515 | return; |
| 516 | } |
| 517 | |
Jeff Dike | 2adcec2 | 2007-05-06 14:51:37 -0700 | [diff] [blame] | 518 | rq = req->req; |
| 519 | rq->nr_sectors -= req->length >> 9; |
Jeff Dike | a0044bd | 2007-05-06 14:51:36 -0700 | [diff] [blame] | 520 | if(rq->nr_sectors == 0) |
| 521 | ubd_finish(rq, rq->hard_nr_sectors << 9); |
Jeff Dike | 2adcec2 | 2007-05-06 14:51:37 -0700 | [diff] [blame] | 522 | kfree(req); |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 523 | } |
Jeff Dike | 62f96cb | 2007-02-10 01:44:16 -0800 | [diff] [blame] | 524 | reactivate_fd(thread_fd, UBD_IRQ); |
Jeff Dike | a0044bd | 2007-05-06 14:51:36 -0700 | [diff] [blame] | 525 | |
| 526 | list_for_each_safe(list, next_ele, &restart){ |
| 527 | ubd = container_of(list, struct ubd, restart); |
| 528 | list_del_init(&ubd->restart); |
| 529 | spin_lock_irqsave(&ubd->lock, flags); |
| 530 | do_ubd_request(ubd->queue); |
| 531 | spin_unlock_irqrestore(&ubd->lock, flags); |
| 532 | } |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 533 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 534 | |
Al Viro | 7bea96f | 2006-10-08 22:49:34 +0100 | [diff] [blame] | 535 | static irqreturn_t ubd_intr(int irq, void *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 536 | { |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 537 | ubd_handler(); |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 538 | return IRQ_HANDLED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 539 | } |
| 540 | |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 541 | /* Only changed by ubd_init, which is an initcall. */ |
| 542 | static int io_pid = -1; |
| 543 | |
| 544 | void kill_io_thread(void) |
| 545 | { |
Jeff Dike | 6c29256c | 2006-03-27 01:14:37 -0800 | [diff] [blame] | 546 | if(io_pid != -1) |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 547 | os_kill_process(io_pid, 1); |
| 548 | } |
| 549 | |
| 550 | __uml_exitcall(kill_io_thread); |
| 551 | |
Paolo 'Blaisorblade' Giarrusso | d8d7c28 | 2006-10-30 22:07:12 -0800 | [diff] [blame] | 552 | 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] | 553 | { |
| 554 | char *file; |
| 555 | |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 556 | file = ubd_dev->cow.file ? ubd_dev->cow.file : ubd_dev->file; |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 557 | return os_file_size(file, size_out); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 558 | } |
| 559 | |
Paolo 'Blaisorblade' Giarrusso | 5f75a4f | 2006-10-30 22:07:06 -0800 | [diff] [blame] | 560 | static void ubd_close_dev(struct ubd *ubd_dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 561 | { |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 562 | os_close_file(ubd_dev->fd); |
| 563 | if(ubd_dev->cow.file == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 564 | return; |
| 565 | |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 566 | os_close_file(ubd_dev->cow.fd); |
| 567 | vfree(ubd_dev->cow.bitmap); |
| 568 | ubd_dev->cow.bitmap = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 569 | } |
| 570 | |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 571 | static int ubd_open_dev(struct ubd *ubd_dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 572 | { |
| 573 | struct openflags flags; |
| 574 | char **back_ptr; |
| 575 | int err, create_cow, *create_ptr; |
Paolo 'Blaisorblade' Giarrusso | 0bf16bf | 2006-10-30 22:07:11 -0800 | [diff] [blame] | 576 | int fd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 577 | |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 578 | ubd_dev->openflags = ubd_dev->boot_openflags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 579 | create_cow = 0; |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 580 | create_ptr = (ubd_dev->cow.file != NULL) ? &create_cow : NULL; |
| 581 | back_ptr = ubd_dev->no_cow ? NULL : &ubd_dev->cow.file; |
Paolo 'Blaisorblade' Giarrusso | 0bf16bf | 2006-10-30 22:07:11 -0800 | [diff] [blame] | 582 | |
| 583 | 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] | 584 | back_ptr, &ubd_dev->cow.bitmap_offset, |
| 585 | &ubd_dev->cow.bitmap_len, &ubd_dev->cow.data_offset, |
Jeff Dike | 6c29256c | 2006-03-27 01:14:37 -0800 | [diff] [blame] | 586 | create_ptr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 587 | |
Paolo 'Blaisorblade' Giarrusso | 0bf16bf | 2006-10-30 22:07:11 -0800 | [diff] [blame] | 588 | if((fd == -ENOENT) && create_cow){ |
| 589 | fd = create_cow_file(ubd_dev->file, ubd_dev->cow.file, |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 590 | ubd_dev->openflags, 1 << 9, PAGE_SIZE, |
| 591 | &ubd_dev->cow.bitmap_offset, |
| 592 | &ubd_dev->cow.bitmap_len, |
| 593 | &ubd_dev->cow.data_offset); |
Paolo 'Blaisorblade' Giarrusso | 0bf16bf | 2006-10-30 22:07:11 -0800 | [diff] [blame] | 594 | if(fd >= 0){ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 595 | printk(KERN_INFO "Creating \"%s\" as COW file for " |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 596 | "\"%s\"\n", ubd_dev->file, ubd_dev->cow.file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 597 | } |
| 598 | } |
| 599 | |
Paolo 'Blaisorblade' Giarrusso | 0bf16bf | 2006-10-30 22:07:11 -0800 | [diff] [blame] | 600 | if(fd < 0){ |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 601 | printk("Failed to open '%s', errno = %d\n", ubd_dev->file, |
Paolo 'Blaisorblade' Giarrusso | 0bf16bf | 2006-10-30 22:07:11 -0800 | [diff] [blame] | 602 | -fd); |
| 603 | return fd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 604 | } |
Paolo 'Blaisorblade' Giarrusso | 0bf16bf | 2006-10-30 22:07:11 -0800 | [diff] [blame] | 605 | ubd_dev->fd = fd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 607 | if(ubd_dev->cow.file != NULL){ |
Jeff Dike | f4768ff | 2007-08-22 14:01:53 -0700 | [diff] [blame] | 608 | blk_queue_max_sectors(ubd_dev->queue, 8 * sizeof(long)); |
| 609 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 610 | err = -ENOMEM; |
Jesper Juhl | da2486b | 2007-10-16 01:27:19 -0700 | [diff] [blame] | 611 | ubd_dev->cow.bitmap = vmalloc(ubd_dev->cow.bitmap_len); |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 612 | if(ubd_dev->cow.bitmap == NULL){ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 613 | printk(KERN_ERR "Failed to vmalloc COW bitmap\n"); |
| 614 | goto error; |
| 615 | } |
| 616 | flush_tlb_kernel_vm(); |
| 617 | |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 618 | err = read_cow_bitmap(ubd_dev->fd, ubd_dev->cow.bitmap, |
| 619 | ubd_dev->cow.bitmap_offset, |
| 620 | ubd_dev->cow.bitmap_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 621 | if(err < 0) |
| 622 | goto error; |
| 623 | |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 624 | flags = ubd_dev->openflags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 625 | flags.w = 0; |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 626 | 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] | 627 | NULL, NULL, NULL, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 628 | if(err < 0) goto error; |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 629 | ubd_dev->cow.fd = err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 630 | } |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 631 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 632 | error: |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 633 | os_close_file(ubd_dev->fd); |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 634 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 635 | } |
| 636 | |
Jeff Dike | 2e3f525 | 2007-05-06 14:51:29 -0700 | [diff] [blame] | 637 | static void ubd_device_release(struct device *dev) |
| 638 | { |
| 639 | struct ubd *ubd_dev = dev->driver_data; |
| 640 | |
| 641 | blk_cleanup_queue(ubd_dev->queue); |
| 642 | *ubd_dev = ((struct ubd) DEFAULT_UBD); |
| 643 | } |
| 644 | |
Paolo 'Blaisorblade' Giarrusso | 5f75a4f | 2006-10-30 22:07:06 -0800 | [diff] [blame] | 645 | static int ubd_disk_register(int major, u64 size, int unit, |
Jeff Dike | b8831a1 | 2007-02-10 01:44:17 -0800 | [diff] [blame] | 646 | struct gendisk **disk_out) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 647 | { |
| 648 | struct gendisk *disk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 649 | |
| 650 | disk = alloc_disk(1 << UBD_SHIFT); |
| 651 | if(disk == NULL) |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 652 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 653 | |
| 654 | disk->major = major; |
| 655 | disk->first_minor = unit << UBD_SHIFT; |
| 656 | disk->fops = &ubd_blops; |
| 657 | set_capacity(disk, size / 512); |
Greg Kroah-Hartman | ce7b0f4 | 2005-06-20 21:15:16 -0700 | [diff] [blame] | 658 | if(major == MAJOR_NR) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 659 | sprintf(disk->disk_name, "ubd%c", 'a' + unit); |
Greg Kroah-Hartman | ce7b0f4 | 2005-06-20 21:15:16 -0700 | [diff] [blame] | 660 | else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 661 | sprintf(disk->disk_name, "ubd_fake%d", unit); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 662 | |
| 663 | /* sysfs register (not for ide fake devices) */ |
| 664 | if (major == MAJOR_NR) { |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 665 | ubd_devs[unit].pdev.id = unit; |
| 666 | ubd_devs[unit].pdev.name = DRIVER_NAME; |
Jeff Dike | 2e3f525 | 2007-05-06 14:51:29 -0700 | [diff] [blame] | 667 | ubd_devs[unit].pdev.dev.release = ubd_device_release; |
| 668 | ubd_devs[unit].pdev.dev.driver_data = &ubd_devs[unit]; |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 669 | platform_device_register(&ubd_devs[unit].pdev); |
| 670 | disk->driverfs_dev = &ubd_devs[unit].pdev.dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 671 | } |
| 672 | |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 673 | disk->private_data = &ubd_devs[unit]; |
Jeff Dike | 62f96cb | 2007-02-10 01:44:16 -0800 | [diff] [blame] | 674 | disk->queue = ubd_devs[unit].queue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 675 | add_disk(disk); |
| 676 | |
| 677 | *disk_out = disk; |
| 678 | return 0; |
| 679 | } |
| 680 | |
| 681 | #define ROUND_BLOCK(n) ((n + ((1 << 9) - 1)) & (-1 << 9)) |
| 682 | |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 683 | static int ubd_add(int n, char **error_out) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 684 | { |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 685 | struct ubd *ubd_dev = &ubd_devs[n]; |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 686 | int err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 687 | |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 688 | if(ubd_dev->file == NULL) |
Jeff Dike | ec7cf78 | 2005-09-03 15:57:29 -0700 | [diff] [blame] | 689 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 690 | |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 691 | err = ubd_file_size(ubd_dev, &ubd_dev->size); |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 692 | if(err < 0){ |
| 693 | *error_out = "Couldn't determine size of device's file"; |
Jeff Dike | 80c1374 | 2006-09-29 01:58:51 -0700 | [diff] [blame] | 694 | goto out; |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 695 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 696 | |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 697 | ubd_dev->size = ROUND_BLOCK(ubd_dev->size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 698 | |
Jeff Dike | a0044bd | 2007-05-06 14:51:36 -0700 | [diff] [blame] | 699 | INIT_LIST_HEAD(&ubd_dev->restart); |
WANG Cong | 4f40c05 | 2007-11-05 14:50:59 -0800 | [diff] [blame] | 700 | sg_init_table(ubd_dev->sg, MAX_SG); |
Jeff Dike | a0044bd | 2007-05-06 14:51:36 -0700 | [diff] [blame] | 701 | |
Jeff Dike | 62f96cb | 2007-02-10 01:44:16 -0800 | [diff] [blame] | 702 | err = -ENOMEM; |
| 703 | ubd_dev->queue = blk_init_queue(do_ubd_request, &ubd_dev->lock); |
| 704 | if (ubd_dev->queue == NULL) { |
| 705 | *error_out = "Failed to initialize device queue"; |
Jeff Dike | 80c1374 | 2006-09-29 01:58:51 -0700 | [diff] [blame] | 706 | goto out; |
Jeff Dike | 62f96cb | 2007-02-10 01:44:16 -0800 | [diff] [blame] | 707 | } |
| 708 | ubd_dev->queue->queuedata = ubd_dev; |
| 709 | |
Jeff Dike | a0044bd | 2007-05-06 14:51:36 -0700 | [diff] [blame] | 710 | blk_queue_max_hw_segments(ubd_dev->queue, MAX_SG); |
Jeff Dike | 62f96cb | 2007-02-10 01:44:16 -0800 | [diff] [blame] | 711 | err = ubd_disk_register(MAJOR_NR, ubd_dev->size, n, &ubd_gendisk[n]); |
| 712 | if(err){ |
| 713 | *error_out = "Failed to register device"; |
| 714 | goto out_cleanup; |
| 715 | } |
Jeff Dike | 6c29256c | 2006-03-27 01:14:37 -0800 | [diff] [blame] | 716 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 717 | if(fake_major != MAJOR_NR) |
Paolo 'Blaisorblade' Giarrusso | 5f75a4f | 2006-10-30 22:07:06 -0800 | [diff] [blame] | 718 | ubd_disk_register(fake_major, ubd_dev->size, n, |
Jeff Dike | 62f96cb | 2007-02-10 01:44:16 -0800 | [diff] [blame] | 719 | &fake_gendisk[n]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 720 | |
| 721 | /* perhaps this should also be under the "if (fake_major)" above */ |
| 722 | /* using the fake_disk->disk_name and also the fakehd_set name */ |
| 723 | if (fake_ide) |
| 724 | make_ide_entries(ubd_gendisk[n]->disk_name); |
| 725 | |
Jeff Dike | ec7cf78 | 2005-09-03 15:57:29 -0700 | [diff] [blame] | 726 | err = 0; |
Jeff Dike | ec7cf78 | 2005-09-03 15:57:29 -0700 | [diff] [blame] | 727 | out: |
| 728 | return err; |
Jeff Dike | 62f96cb | 2007-02-10 01:44:16 -0800 | [diff] [blame] | 729 | |
| 730 | out_cleanup: |
| 731 | blk_cleanup_queue(ubd_dev->queue); |
| 732 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 733 | } |
| 734 | |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 735 | static int ubd_config(char *str, char **error_out) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 736 | { |
Paolo 'Blaisorblade' Giarrusso | e7f6552 | 2006-10-30 22:07:09 -0800 | [diff] [blame] | 737 | int n, ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 738 | |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 739 | /* This string is possibly broken up and stored, so it's only |
| 740 | * freed if ubd_setup_common fails, or if only general options |
| 741 | * were set. |
| 742 | */ |
Jeff Dike | 970d6e3 | 2006-01-06 00:18:48 -0800 | [diff] [blame] | 743 | str = kstrdup(str, GFP_KERNEL); |
Paolo 'Blaisorblade' Giarrusso | e7f6552 | 2006-10-30 22:07:09 -0800 | [diff] [blame] | 744 | if (str == NULL) { |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 745 | *error_out = "Failed to allocate memory"; |
| 746 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 747 | } |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 748 | |
| 749 | ret = ubd_setup_common(str, &n, error_out); |
| 750 | if (ret) |
Paolo 'Blaisorblade' Giarrusso | e7f6552 | 2006-10-30 22:07:09 -0800 | [diff] [blame] | 751 | goto err_free; |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 752 | |
Paolo 'Blaisorblade' Giarrusso | e7f6552 | 2006-10-30 22:07:09 -0800 | [diff] [blame] | 753 | if (n == -1) { |
| 754 | ret = 0; |
Paolo 'Blaisorblade' Giarrusso | d8d7c28 | 2006-10-30 22:07:12 -0800 | [diff] [blame] | 755 | goto err_free; |
Paolo 'Blaisorblade' Giarrusso | e7f6552 | 2006-10-30 22:07:09 -0800 | [diff] [blame] | 756 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 757 | |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 758 | mutex_lock(&ubd_lock); |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 759 | ret = ubd_add(n, error_out); |
Paolo 'Blaisorblade' Giarrusso | e7f6552 | 2006-10-30 22:07:09 -0800 | [diff] [blame] | 760 | if (ret) |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 761 | ubd_devs[n].file = NULL; |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 762 | mutex_unlock(&ubd_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 763 | |
Paolo 'Blaisorblade' Giarrusso | e7f6552 | 2006-10-30 22:07:09 -0800 | [diff] [blame] | 764 | out: |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 765 | return ret; |
Paolo 'Blaisorblade' Giarrusso | e7f6552 | 2006-10-30 22:07:09 -0800 | [diff] [blame] | 766 | |
| 767 | err_free: |
| 768 | kfree(str); |
| 769 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 770 | } |
| 771 | |
| 772 | static int ubd_get_config(char *name, char *str, int size, char **error_out) |
| 773 | { |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 774 | struct ubd *ubd_dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 775 | int n, len = 0; |
| 776 | |
| 777 | n = parse_unit(&name); |
| 778 | if((n >= MAX_DEV) || (n < 0)){ |
| 779 | *error_out = "ubd_get_config : device number out of range"; |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 780 | return -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 781 | } |
| 782 | |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 783 | ubd_dev = &ubd_devs[n]; |
Paolo 'Blaisorblade' Giarrusso | d7fb2c3 | 2006-10-30 22:07:07 -0800 | [diff] [blame] | 784 | mutex_lock(&ubd_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 785 | |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 786 | if(ubd_dev->file == NULL){ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 787 | CONFIG_CHUNK(str, size, len, "", 1); |
| 788 | goto out; |
| 789 | } |
| 790 | |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 791 | CONFIG_CHUNK(str, size, len, ubd_dev->file, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 792 | |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 793 | if(ubd_dev->cow.file != NULL){ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 794 | CONFIG_CHUNK(str, size, len, ",", 0); |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 795 | CONFIG_CHUNK(str, size, len, ubd_dev->cow.file, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 796 | } |
| 797 | else CONFIG_CHUNK(str, size, len, "", 1); |
| 798 | |
| 799 | out: |
Paolo 'Blaisorblade' Giarrusso | d7fb2c3 | 2006-10-30 22:07:07 -0800 | [diff] [blame] | 800 | mutex_unlock(&ubd_lock); |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 801 | return len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 802 | } |
| 803 | |
Jeff Dike | 29d56cf | 2005-06-25 14:55:25 -0700 | [diff] [blame] | 804 | static int ubd_id(char **str, int *start_out, int *end_out) |
| 805 | { |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 806 | int n; |
Jeff Dike | 29d56cf | 2005-06-25 14:55:25 -0700 | [diff] [blame] | 807 | |
| 808 | n = parse_unit(str); |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 809 | *start_out = 0; |
| 810 | *end_out = MAX_DEV - 1; |
| 811 | return n; |
Jeff Dike | 29d56cf | 2005-06-25 14:55:25 -0700 | [diff] [blame] | 812 | } |
| 813 | |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 814 | static int ubd_remove(int n, char **error_out) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 815 | { |
Jeff Dike | 2e3f525 | 2007-05-06 14:51:29 -0700 | [diff] [blame] | 816 | struct gendisk *disk = ubd_gendisk[n]; |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 817 | struct ubd *ubd_dev; |
Jeff Dike | 29d56cf | 2005-06-25 14:55:25 -0700 | [diff] [blame] | 818 | int err = -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 819 | |
Paolo 'Blaisorblade' Giarrusso | d7fb2c3 | 2006-10-30 22:07:07 -0800 | [diff] [blame] | 820 | mutex_lock(&ubd_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 821 | |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 822 | ubd_dev = &ubd_devs[n]; |
Jeff Dike | 29d56cf | 2005-06-25 14:55:25 -0700 | [diff] [blame] | 823 | |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 824 | if(ubd_dev->file == NULL) |
Jeff Dike | 29d56cf | 2005-06-25 14:55:25 -0700 | [diff] [blame] | 825 | goto out; |
| 826 | |
| 827 | /* you cannot remove a open disk */ |
| 828 | err = -EBUSY; |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 829 | if(ubd_dev->count > 0) |
Jeff Dike | 29d56cf | 2005-06-25 14:55:25 -0700 | [diff] [blame] | 830 | goto out; |
| 831 | |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 832 | ubd_gendisk[n] = NULL; |
Jeff Dike | b47d2de | 2007-05-06 14:51:01 -0700 | [diff] [blame] | 833 | if(disk != NULL){ |
| 834 | del_gendisk(disk); |
| 835 | put_disk(disk); |
| 836 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 837 | |
| 838 | if(fake_gendisk[n] != NULL){ |
| 839 | del_gendisk(fake_gendisk[n]); |
| 840 | put_disk(fake_gendisk[n]); |
| 841 | fake_gendisk[n] = NULL; |
| 842 | } |
| 843 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 844 | err = 0; |
Jeff Dike | 2e3f525 | 2007-05-06 14:51:29 -0700 | [diff] [blame] | 845 | platform_device_unregister(&ubd_dev->pdev); |
Jeff Dike | 29d56cf | 2005-06-25 14:55:25 -0700 | [diff] [blame] | 846 | out: |
Paolo 'Blaisorblade' Giarrusso | d7fb2c3 | 2006-10-30 22:07:07 -0800 | [diff] [blame] | 847 | mutex_unlock(&ubd_lock); |
Jeff Dike | 29d56cf | 2005-06-25 14:55:25 -0700 | [diff] [blame] | 848 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 849 | } |
| 850 | |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 851 | /* All these are called by mconsole in process context and without |
Jeff Dike | b8831a1 | 2007-02-10 01:44:17 -0800 | [diff] [blame] | 852 | * ubd-specific locks. The structure itself is const except for .list. |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 853 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 854 | static struct mc_device ubd_mc = { |
Jeff Dike | 84f48d4 | 2007-02-10 01:44:01 -0800 | [diff] [blame] | 855 | .list = LIST_HEAD_INIT(ubd_mc.list), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 856 | .name = "ubd", |
| 857 | .config = ubd_config, |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 858 | .get_config = ubd_get_config, |
Jeff Dike | 29d56cf | 2005-06-25 14:55:25 -0700 | [diff] [blame] | 859 | .id = ubd_id, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 860 | .remove = ubd_remove, |
| 861 | }; |
| 862 | |
Paolo 'Blaisorblade' Giarrusso | d8d7c28 | 2006-10-30 22:07:12 -0800 | [diff] [blame] | 863 | static int __init ubd_mc_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 864 | { |
| 865 | mconsole_register_dev(&ubd_mc); |
| 866 | return 0; |
| 867 | } |
| 868 | |
| 869 | __initcall(ubd_mc_init); |
| 870 | |
Paolo 'Blaisorblade' Giarrusso | d8d7c28 | 2006-10-30 22:07:12 -0800 | [diff] [blame] | 871 | static int __init ubd0_init(void) |
| 872 | { |
| 873 | struct ubd *ubd_dev = &ubd_devs[0]; |
| 874 | |
Jeff Dike | b8831a1 | 2007-02-10 01:44:17 -0800 | [diff] [blame] | 875 | mutex_lock(&ubd_lock); |
Paolo 'Blaisorblade' Giarrusso | d8d7c28 | 2006-10-30 22:07:12 -0800 | [diff] [blame] | 876 | if(ubd_dev->file == NULL) |
| 877 | ubd_dev->file = "root_fs"; |
Jeff Dike | b8831a1 | 2007-02-10 01:44:17 -0800 | [diff] [blame] | 878 | mutex_unlock(&ubd_lock); |
| 879 | |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 880 | return 0; |
Paolo 'Blaisorblade' Giarrusso | d8d7c28 | 2006-10-30 22:07:12 -0800 | [diff] [blame] | 881 | } |
| 882 | |
| 883 | __initcall(ubd0_init); |
| 884 | |
Jeff Dike | b8831a1 | 2007-02-10 01:44:17 -0800 | [diff] [blame] | 885 | /* Used in ubd_init, which is an initcall */ |
Russell King | 3ae5eae | 2005-11-09 22:32:44 +0000 | [diff] [blame] | 886 | static struct platform_driver ubd_driver = { |
| 887 | .driver = { |
| 888 | .name = DRIVER_NAME, |
| 889 | }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 890 | }; |
| 891 | |
Paolo 'Blaisorblade' Giarrusso | d8d7c28 | 2006-10-30 22:07:12 -0800 | [diff] [blame] | 892 | static int __init ubd_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 893 | { |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 894 | char *error; |
| 895 | int i, err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 896 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 897 | if (register_blkdev(MAJOR_NR, "ubd")) |
| 898 | return -1; |
| 899 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 900 | if (fake_major != MAJOR_NR) { |
| 901 | char name[sizeof("ubd_nnn\0")]; |
| 902 | |
| 903 | snprintf(name, sizeof(name), "ubd_%d", fake_major); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 904 | if (register_blkdev(fake_major, "ubd")) |
| 905 | return -1; |
| 906 | } |
Russell King | 3ae5eae | 2005-11-09 22:32:44 +0000 | [diff] [blame] | 907 | platform_driver_register(&ubd_driver); |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 908 | mutex_lock(&ubd_lock); |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 909 | for (i = 0; i < MAX_DEV; i++){ |
| 910 | err = ubd_add(i, &error); |
| 911 | if(err) |
| 912 | printk(KERN_ERR "Failed to initialize ubd device %d :" |
| 913 | "%s\n", i, error); |
| 914 | } |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 915 | mutex_unlock(&ubd_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 916 | return 0; |
| 917 | } |
| 918 | |
| 919 | late_initcall(ubd_init); |
| 920 | |
Paolo 'Blaisorblade' Giarrusso | d8d7c28 | 2006-10-30 22:07:12 -0800 | [diff] [blame] | 921 | static int __init ubd_driver_init(void){ |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 922 | unsigned long stack; |
| 923 | int err; |
| 924 | |
| 925 | /* Set by CONFIG_BLK_DEV_UBD_SYNC or ubd=sync.*/ |
| 926 | if(global_openflags.s){ |
| 927 | printk(KERN_INFO "ubd: Synchronous mode\n"); |
| 928 | /* Letting ubd=sync be like using ubd#s= instead of ubd#= is |
| 929 | * enough. So use anyway the io thread. */ |
| 930 | } |
| 931 | stack = alloc_stack(0, 0); |
Jeff Dike | 6c29256c | 2006-03-27 01:14:37 -0800 | [diff] [blame] | 932 | io_pid = start_io_thread(stack + PAGE_SIZE - sizeof(void *), |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 933 | &thread_fd); |
| 934 | if(io_pid < 0){ |
Jeff Dike | 6c29256c | 2006-03-27 01:14:37 -0800 | [diff] [blame] | 935 | printk(KERN_ERR |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 936 | "ubd : Failed to start I/O thread (errno = %d) - " |
| 937 | "falling back to synchronous I/O\n", -io_pid); |
| 938 | io_pid = -1; |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 939 | return 0; |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 940 | } |
Jeff Dike | 6c29256c | 2006-03-27 01:14:37 -0800 | [diff] [blame] | 941 | err = um_request_irq(UBD_IRQ, thread_fd, IRQ_READ, ubd_intr, |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 942 | IRQF_DISABLED, "ubd", ubd_devs); |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 943 | if(err != 0) |
| 944 | printk(KERN_ERR "um_request_irq failed - errno = %d\n", -err); |
Jeff Dike | f4c57a7 | 2006-03-31 02:30:10 -0800 | [diff] [blame] | 945 | return 0; |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 946 | } |
| 947 | |
| 948 | device_initcall(ubd_driver_init); |
| 949 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 950 | static int ubd_open(struct inode *inode, struct file *filp) |
| 951 | { |
| 952 | struct gendisk *disk = inode->i_bdev->bd_disk; |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 953 | struct ubd *ubd_dev = disk->private_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 954 | int err = 0; |
| 955 | |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 956 | if(ubd_dev->count == 0){ |
| 957 | err = ubd_open_dev(ubd_dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 958 | if(err){ |
| 959 | printk(KERN_ERR "%s: Can't open \"%s\": errno = %d\n", |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 960 | disk->disk_name, ubd_dev->file, -err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 961 | goto out; |
| 962 | } |
| 963 | } |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 964 | ubd_dev->count++; |
| 965 | set_disk_ro(disk, !ubd_dev->openflags.w); |
Paolo 'Blaisorblade' Giarrusso | 2c49be9 | 2005-05-01 08:58:57 -0700 | [diff] [blame] | 966 | |
| 967 | /* This should no more be needed. And it didn't work anyway to exclude |
| 968 | * read-write remounting of filesystems.*/ |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 969 | /*if((filp->f_mode & FMODE_WRITE) && !ubd_dev->openflags.w){ |
Paolo 'Blaisorblade' Giarrusso | 5f75a4f | 2006-10-30 22:07:06 -0800 | [diff] [blame] | 970 | if(--ubd_dev->count == 0) ubd_close_dev(ubd_dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 971 | err = -EROFS; |
Paolo 'Blaisorblade' Giarrusso | 2c49be9 | 2005-05-01 08:58:57 -0700 | [diff] [blame] | 972 | }*/ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 973 | out: |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 974 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 975 | } |
| 976 | |
| 977 | static int ubd_release(struct inode * inode, struct file * file) |
| 978 | { |
| 979 | struct gendisk *disk = inode->i_bdev->bd_disk; |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 980 | struct ubd *ubd_dev = disk->private_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 981 | |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 982 | if(--ubd_dev->count == 0) |
Paolo 'Blaisorblade' Giarrusso | 5f75a4f | 2006-10-30 22:07:06 -0800 | [diff] [blame] | 983 | ubd_close_dev(ubd_dev); |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 984 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 985 | } |
| 986 | |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 987 | static void cowify_bitmap(__u64 io_offset, int length, unsigned long *cow_mask, |
| 988 | __u64 *cow_offset, unsigned long *bitmap, |
| 989 | __u64 bitmap_offset, unsigned long *bitmap_words, |
| 990 | __u64 bitmap_len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 991 | { |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 992 | __u64 sector = io_offset >> 9; |
| 993 | int i, update_bitmap = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 994 | |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 995 | for(i = 0; i < length >> 9; i++){ |
| 996 | if(cow_mask != NULL) |
| 997 | ubd_set_bit(i, (unsigned char *) cow_mask); |
| 998 | if(ubd_test_bit(sector + i, (unsigned char *) bitmap)) |
| 999 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1000 | |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1001 | update_bitmap = 1; |
| 1002 | ubd_set_bit(sector + i, (unsigned char *) bitmap); |
| 1003 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1004 | |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1005 | if(!update_bitmap) |
| 1006 | return; |
| 1007 | |
| 1008 | *cow_offset = sector / (sizeof(unsigned long) * 8); |
| 1009 | |
| 1010 | /* This takes care of the case where we're exactly at the end of the |
| 1011 | * device, and *cow_offset + 1 is off the end. So, just back it up |
| 1012 | * by one word. Thanks to Lynn Kerby for the fix and James McMechan |
| 1013 | * for the original diagnosis. |
| 1014 | */ |
| 1015 | if(*cow_offset == ((bitmap_len + sizeof(unsigned long) - 1) / |
| 1016 | sizeof(unsigned long) - 1)) |
| 1017 | (*cow_offset)--; |
| 1018 | |
| 1019 | bitmap_words[0] = bitmap[*cow_offset]; |
| 1020 | bitmap_words[1] = bitmap[*cow_offset + 1]; |
| 1021 | |
| 1022 | *cow_offset *= sizeof(unsigned long); |
| 1023 | *cow_offset += bitmap_offset; |
| 1024 | } |
| 1025 | |
| 1026 | static void cowify_req(struct io_thread_req *req, unsigned long *bitmap, |
| 1027 | __u64 bitmap_offset, __u64 bitmap_len) |
| 1028 | { |
| 1029 | __u64 sector = req->offset >> 9; |
| 1030 | int i; |
| 1031 | |
| 1032 | if(req->length > (sizeof(req->sector_mask) * 8) << 9) |
| 1033 | panic("Operation too long"); |
| 1034 | |
| 1035 | if(req->op == UBD_READ) { |
| 1036 | for(i = 0; i < req->length >> 9; i++){ |
| 1037 | if(ubd_test_bit(sector + i, (unsigned char *) bitmap)) |
Jeff Dike | 6c29256c | 2006-03-27 01:14:37 -0800 | [diff] [blame] | 1038 | ubd_set_bit(i, (unsigned char *) |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1039 | &req->sector_mask); |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 1040 | } |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1041 | } |
| 1042 | else cowify_bitmap(req->offset, req->length, &req->sector_mask, |
| 1043 | &req->cow_offset, bitmap, bitmap_offset, |
| 1044 | req->bitmap_words, bitmap_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1045 | } |
| 1046 | |
Jeff Dike | 62f96cb | 2007-02-10 01:44:16 -0800 | [diff] [blame] | 1047 | /* Called with dev->lock held */ |
Jeff Dike | a0044bd | 2007-05-06 14:51:36 -0700 | [diff] [blame] | 1048 | static void prepare_request(struct request *req, struct io_thread_req *io_req, |
| 1049 | unsigned long long offset, int page_offset, |
| 1050 | int len, struct page *page) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1051 | { |
| 1052 | struct gendisk *disk = req->rq_disk; |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 1053 | struct ubd *ubd_dev = disk->private_data; |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1054 | |
Jeff Dike | 62f96cb | 2007-02-10 01:44:16 -0800 | [diff] [blame] | 1055 | io_req->req = req; |
Jeff Dike | a0044bd | 2007-05-06 14:51:36 -0700 | [diff] [blame] | 1056 | io_req->fds[0] = (ubd_dev->cow.file != NULL) ? ubd_dev->cow.fd : |
| 1057 | ubd_dev->fd; |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 1058 | io_req->fds[1] = ubd_dev->fd; |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1059 | io_req->cow_offset = -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1060 | io_req->offset = offset; |
| 1061 | io_req->length = len; |
| 1062 | io_req->error = 0; |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1063 | io_req->sector_mask = 0; |
| 1064 | |
| 1065 | io_req->op = (rq_data_dir(req) == READ) ? UBD_READ : UBD_WRITE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1066 | io_req->offsets[0] = 0; |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 1067 | io_req->offsets[1] = ubd_dev->cow.data_offset; |
Jeff Dike | a0044bd | 2007-05-06 14:51:36 -0700 | [diff] [blame] | 1068 | io_req->buffer = page_address(page) + page_offset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1069 | io_req->sectorsize = 1 << 9; |
| 1070 | |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 1071 | if(ubd_dev->cow.file != NULL) |
Jeff Dike | a0044bd | 2007-05-06 14:51:36 -0700 | [diff] [blame] | 1072 | cowify_req(io_req, ubd_dev->cow.bitmap, |
| 1073 | ubd_dev->cow.bitmap_offset, ubd_dev->cow.bitmap_len); |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1074 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1075 | } |
| 1076 | |
Jeff Dike | 62f96cb | 2007-02-10 01:44:16 -0800 | [diff] [blame] | 1077 | /* Called with dev->lock held */ |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 1078 | static void do_ubd_request(struct request_queue *q) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1079 | { |
Jeff Dike | 2adcec2 | 2007-05-06 14:51:37 -0700 | [diff] [blame] | 1080 | struct io_thread_req *io_req; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1081 | struct request *req; |
Jeff Dike | 0a6d3a2 | 2007-07-15 23:38:47 -0700 | [diff] [blame] | 1082 | int n, last_sectors; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1083 | |
Jeff Dike | a0044bd | 2007-05-06 14:51:36 -0700 | [diff] [blame] | 1084 | while(1){ |
Jeff Dike | 2a9529a | 2007-03-29 01:20:27 -0700 | [diff] [blame] | 1085 | struct ubd *dev = q->queuedata; |
Jeff Dike | a0044bd | 2007-05-06 14:51:36 -0700 | [diff] [blame] | 1086 | if(dev->end_sg == 0){ |
| 1087 | struct request *req = elv_next_request(q); |
| 1088 | if(req == NULL) |
| 1089 | return; |
| 1090 | |
| 1091 | dev->request = req; |
| 1092 | blkdev_dequeue_request(req); |
| 1093 | dev->start_sg = 0; |
| 1094 | dev->end_sg = blk_rq_map_sg(q, req, dev->sg); |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1095 | } |
Jeff Dike | a0044bd | 2007-05-06 14:51:36 -0700 | [diff] [blame] | 1096 | |
| 1097 | req = dev->request; |
Jeff Dike | 0a6d3a2 | 2007-07-15 23:38:47 -0700 | [diff] [blame] | 1098 | last_sectors = 0; |
Jeff Dike | a0044bd | 2007-05-06 14:51:36 -0700 | [diff] [blame] | 1099 | while(dev->start_sg < dev->end_sg){ |
| 1100 | struct scatterlist *sg = &dev->sg[dev->start_sg]; |
| 1101 | |
Jeff Dike | 0a6d3a2 | 2007-07-15 23:38:47 -0700 | [diff] [blame] | 1102 | req->sector += last_sectors; |
Jeff Dike | 2adcec2 | 2007-05-06 14:51:37 -0700 | [diff] [blame] | 1103 | io_req = kmalloc(sizeof(struct io_thread_req), |
Peter Zijlstra | 990c558 | 2007-05-06 14:51:38 -0700 | [diff] [blame] | 1104 | GFP_ATOMIC); |
Jeff Dike | 2adcec2 | 2007-05-06 14:51:37 -0700 | [diff] [blame] | 1105 | if(io_req == NULL){ |
| 1106 | if(list_empty(&dev->restart)) |
| 1107 | list_add(&dev->restart, &restart); |
| 1108 | return; |
| 1109 | } |
| 1110 | prepare_request(req, io_req, |
Jeff Dike | a0044bd | 2007-05-06 14:51:36 -0700 | [diff] [blame] | 1111 | (unsigned long long) req->sector << 9, |
Jens Axboe | 45711f1 | 2007-10-22 21:19:53 +0200 | [diff] [blame] | 1112 | sg->offset, sg->length, sg_page(sg)); |
Jeff Dike | a0044bd | 2007-05-06 14:51:36 -0700 | [diff] [blame] | 1113 | |
Jeff Dike | 0a6d3a2 | 2007-07-15 23:38:47 -0700 | [diff] [blame] | 1114 | last_sectors = sg->length >> 9; |
Jeff Dike | a6ea4cc | 2007-05-06 14:51:43 -0700 | [diff] [blame] | 1115 | n = os_write_file(thread_fd, &io_req, |
| 1116 | sizeof(struct io_thread_req *)); |
Jeff Dike | 2adcec2 | 2007-05-06 14:51:37 -0700 | [diff] [blame] | 1117 | if(n != sizeof(struct io_thread_req *)){ |
Jeff Dike | a0044bd | 2007-05-06 14:51:36 -0700 | [diff] [blame] | 1118 | if(n != -EAGAIN) |
| 1119 | printk("write to io thread failed, " |
| 1120 | "errno = %d\n", -n); |
| 1121 | else if(list_empty(&dev->restart)) |
| 1122 | list_add(&dev->restart, &restart); |
Miklos Szeredi | 12429bf | 2007-11-28 16:21:52 -0800 | [diff] [blame] | 1123 | kfree(io_req); |
Jeff Dike | a0044bd | 2007-05-06 14:51:36 -0700 | [diff] [blame] | 1124 | return; |
| 1125 | } |
| 1126 | |
Jeff Dike | a0044bd | 2007-05-06 14:51:36 -0700 | [diff] [blame] | 1127 | dev->start_sg++; |
| 1128 | } |
| 1129 | dev->end_sg = 0; |
| 1130 | dev->request = NULL; |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1131 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1132 | } |
| 1133 | |
Christoph Hellwig | a885c8c | 2006-01-08 01:02:50 -0800 | [diff] [blame] | 1134 | static int ubd_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
| 1135 | { |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 1136 | struct ubd *ubd_dev = bdev->bd_disk->private_data; |
Christoph Hellwig | a885c8c | 2006-01-08 01:02:50 -0800 | [diff] [blame] | 1137 | |
| 1138 | geo->heads = 128; |
| 1139 | geo->sectors = 32; |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 1140 | geo->cylinders = ubd_dev->size / (128 * 32 * 512); |
Christoph Hellwig | a885c8c | 2006-01-08 01:02:50 -0800 | [diff] [blame] | 1141 | return 0; |
| 1142 | } |
| 1143 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1144 | static int ubd_ioctl(struct inode * inode, struct file * file, |
| 1145 | unsigned int cmd, unsigned long arg) |
| 1146 | { |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 1147 | struct ubd *ubd_dev = inode->i_bdev->bd_disk->private_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1148 | struct hd_driveid ubd_id = { |
| 1149 | .cyls = 0, |
| 1150 | .heads = 128, |
| 1151 | .sectors = 32, |
| 1152 | }; |
| 1153 | |
| 1154 | switch (cmd) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1155 | struct cdrom_volctrl volume; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1156 | case HDIO_GET_IDENTITY: |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 1157 | ubd_id.cyls = ubd_dev->size / (128 * 32 * 512); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1158 | if(copy_to_user((char __user *) arg, (char *) &ubd_id, |
| 1159 | sizeof(ubd_id))) |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 1160 | return -EFAULT; |
| 1161 | return 0; |
Jeff Dike | b8831a1 | 2007-02-10 01:44:17 -0800 | [diff] [blame] | 1162 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1163 | case CDROMVOLREAD: |
| 1164 | if(copy_from_user(&volume, (char __user *) arg, sizeof(volume))) |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 1165 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1166 | volume.channel0 = 255; |
| 1167 | volume.channel1 = 255; |
| 1168 | volume.channel2 = 255; |
| 1169 | volume.channel3 = 255; |
| 1170 | if(copy_to_user((char __user *) arg, &volume, sizeof(volume))) |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 1171 | return -EFAULT; |
| 1172 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1173 | } |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 1174 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1175 | } |
| 1176 | |
Paolo 'Blaisorblade' Giarrusso | 4833aff | 2006-01-18 17:43:00 -0800 | [diff] [blame] | 1177 | static int path_requires_switch(char *from_cmdline, char *from_cow, char *cow) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1178 | { |
| 1179 | struct uml_stat buf1, buf2; |
| 1180 | int err; |
| 1181 | |
Paolo 'Blaisorblade' Giarrusso | 4833aff | 2006-01-18 17:43:00 -0800 | [diff] [blame] | 1182 | if(from_cmdline == NULL) |
| 1183 | return 0; |
| 1184 | if(!strcmp(from_cmdline, from_cow)) |
| 1185 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1186 | |
| 1187 | err = os_stat_file(from_cmdline, &buf1); |
| 1188 | if(err < 0){ |
| 1189 | printk("Couldn't stat '%s', err = %d\n", from_cmdline, -err); |
Paolo 'Blaisorblade' Giarrusso | 4833aff | 2006-01-18 17:43:00 -0800 | [diff] [blame] | 1190 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1191 | } |
| 1192 | err = os_stat_file(from_cow, &buf2); |
| 1193 | if(err < 0){ |
| 1194 | printk("Couldn't stat '%s', err = %d\n", from_cow, -err); |
Paolo 'Blaisorblade' Giarrusso | 4833aff | 2006-01-18 17:43:00 -0800 | [diff] [blame] | 1195 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1196 | } |
| 1197 | if((buf1.ust_dev == buf2.ust_dev) && (buf1.ust_ino == buf2.ust_ino)) |
Paolo 'Blaisorblade' Giarrusso | 4833aff | 2006-01-18 17:43:00 -0800 | [diff] [blame] | 1198 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1199 | |
| 1200 | printk("Backing file mismatch - \"%s\" requested,\n" |
| 1201 | "\"%s\" specified in COW header of \"%s\"\n", |
| 1202 | from_cmdline, from_cow, cow); |
Paolo 'Blaisorblade' Giarrusso | 4833aff | 2006-01-18 17:43:00 -0800 | [diff] [blame] | 1203 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1204 | } |
| 1205 | |
| 1206 | static int backing_file_mismatch(char *file, __u64 size, time_t mtime) |
| 1207 | { |
| 1208 | unsigned long modtime; |
Paolo 'Blaisorblade' Giarrusso | fe1db50 | 2006-02-24 13:03:58 -0800 | [diff] [blame] | 1209 | unsigned long long actual; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1210 | int err; |
| 1211 | |
| 1212 | err = os_file_modtime(file, &modtime); |
| 1213 | if(err < 0){ |
| 1214 | printk("Failed to get modification time of backing file " |
| 1215 | "\"%s\", err = %d\n", file, -err); |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 1216 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1217 | } |
| 1218 | |
| 1219 | err = os_file_size(file, &actual); |
| 1220 | if(err < 0){ |
| 1221 | printk("Failed to get size of backing file \"%s\", " |
| 1222 | "err = %d\n", file, -err); |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 1223 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1224 | } |
| 1225 | |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 1226 | if(actual != size){ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1227 | /*__u64 can be a long on AMD64 and with %lu GCC complains; so |
| 1228 | * the typecast.*/ |
| 1229 | printk("Size mismatch (%llu vs %llu) of COW header vs backing " |
| 1230 | "file\n", (unsigned long long) size, actual); |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 1231 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1232 | } |
| 1233 | if(modtime != mtime){ |
| 1234 | printk("mtime mismatch (%ld vs %ld) of COW header vs backing " |
| 1235 | "file\n", mtime, modtime); |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 1236 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1237 | } |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 1238 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1239 | } |
| 1240 | |
| 1241 | int read_cow_bitmap(int fd, void *buf, int offset, int len) |
| 1242 | { |
| 1243 | int err; |
| 1244 | |
| 1245 | err = os_seek_file(fd, offset); |
| 1246 | if(err < 0) |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 1247 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1248 | |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 1249 | err = os_read_file(fd, buf, len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1250 | if(err < 0) |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 1251 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1252 | |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 1253 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1254 | } |
| 1255 | |
Jeff Dike | 6c29256c | 2006-03-27 01:14:37 -0800 | [diff] [blame] | 1256 | int open_ubd_file(char *file, struct openflags *openflags, int shared, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1257 | char **backing_file_out, int *bitmap_offset_out, |
| 1258 | unsigned long *bitmap_len_out, int *data_offset_out, |
| 1259 | int *create_cow_out) |
| 1260 | { |
| 1261 | time_t mtime; |
| 1262 | unsigned long long size; |
| 1263 | __u32 version, align; |
| 1264 | char *backing_file; |
Paolo 'Blaisorblade' Giarrusso | 4833aff | 2006-01-18 17:43:00 -0800 | [diff] [blame] | 1265 | int fd, err, sectorsize, asked_switch, mode = 0644; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1266 | |
| 1267 | fd = os_open_file(file, *openflags, mode); |
Paolo 'Blaisorblade' Giarrusso | a374a48 | 2006-01-18 17:43:01 -0800 | [diff] [blame] | 1268 | if (fd < 0) { |
| 1269 | if ((fd == -ENOENT) && (create_cow_out != NULL)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1270 | *create_cow_out = 1; |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 1271 | if (!openflags->w || |
| 1272 | ((fd != -EROFS) && (fd != -EACCES))) |
Paolo 'Blaisorblade' Giarrusso | a374a48 | 2006-01-18 17:43:01 -0800 | [diff] [blame] | 1273 | return fd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1274 | openflags->w = 0; |
| 1275 | fd = os_open_file(file, *openflags, mode); |
Paolo 'Blaisorblade' Giarrusso | a374a48 | 2006-01-18 17:43:01 -0800 | [diff] [blame] | 1276 | if (fd < 0) |
| 1277 | return fd; |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 1278 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1279 | |
Jeff Dike | 6c29256c | 2006-03-27 01:14:37 -0800 | [diff] [blame] | 1280 | if(shared) |
| 1281 | printk("Not locking \"%s\" on the host\n", file); |
| 1282 | else { |
| 1283 | err = os_lock_file(fd, openflags->w); |
| 1284 | if(err < 0){ |
| 1285 | printk("Failed to lock '%s', err = %d\n", file, -err); |
| 1286 | goto out_close; |
| 1287 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1288 | } |
| 1289 | |
Andreas Mohr | d6e05ed | 2006-06-26 18:35:02 +0200 | [diff] [blame] | 1290 | /* Successful return case! */ |
Paolo 'Blaisorblade' Giarrusso | a374a48 | 2006-01-18 17:43:01 -0800 | [diff] [blame] | 1291 | if(backing_file_out == NULL) |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 1292 | return fd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1293 | |
| 1294 | err = read_cow_header(file_reader, &fd, &version, &backing_file, &mtime, |
| 1295 | &size, §orsize, &align, bitmap_offset_out); |
| 1296 | if(err && (*backing_file_out != NULL)){ |
| 1297 | printk("Failed to read COW header from COW file \"%s\", " |
| 1298 | "errno = %d\n", file, -err); |
| 1299 | goto out_close; |
| 1300 | } |
Paolo 'Blaisorblade' Giarrusso | a374a48 | 2006-01-18 17:43:01 -0800 | [diff] [blame] | 1301 | if(err) |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 1302 | return fd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1303 | |
Paolo 'Blaisorblade' Giarrusso | 4833aff | 2006-01-18 17:43:00 -0800 | [diff] [blame] | 1304 | asked_switch = path_requires_switch(*backing_file_out, backing_file, file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1305 | |
Paolo 'Blaisorblade' Giarrusso | 4833aff | 2006-01-18 17:43:00 -0800 | [diff] [blame] | 1306 | /* Allow switching only if no mismatch. */ |
| 1307 | if (asked_switch && !backing_file_mismatch(*backing_file_out, size, mtime)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1308 | printk("Switching backing file to '%s'\n", *backing_file_out); |
| 1309 | err = write_cow_header(file, fd, *backing_file_out, |
| 1310 | sectorsize, align, &size); |
Paolo 'Blaisorblade' Giarrusso | a374a48 | 2006-01-18 17:43:01 -0800 | [diff] [blame] | 1311 | if (err) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1312 | printk("Switch failed, errno = %d\n", -err); |
Paolo 'Blaisorblade' Giarrusso | 4833aff | 2006-01-18 17:43:00 -0800 | [diff] [blame] | 1313 | goto out_close; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1314 | } |
Paolo 'Blaisorblade' Giarrusso | a374a48 | 2006-01-18 17:43:01 -0800 | [diff] [blame] | 1315 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1316 | *backing_file_out = backing_file; |
| 1317 | err = backing_file_mismatch(*backing_file_out, size, mtime); |
Paolo 'Blaisorblade' Giarrusso | a374a48 | 2006-01-18 17:43:01 -0800 | [diff] [blame] | 1318 | if (err) |
| 1319 | goto out_close; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1320 | } |
| 1321 | |
| 1322 | cow_sizes(version, size, sectorsize, align, *bitmap_offset_out, |
| 1323 | bitmap_len_out, data_offset_out); |
| 1324 | |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 1325 | return fd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1326 | out_close: |
| 1327 | os_close_file(fd); |
Paolo 'Blaisorblade' Giarrusso | a374a48 | 2006-01-18 17:43:01 -0800 | [diff] [blame] | 1328 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1329 | } |
| 1330 | |
| 1331 | int create_cow_file(char *cow_file, char *backing_file, struct openflags flags, |
| 1332 | int sectorsize, int alignment, int *bitmap_offset_out, |
| 1333 | unsigned long *bitmap_len_out, int *data_offset_out) |
| 1334 | { |
| 1335 | int err, fd; |
| 1336 | |
| 1337 | flags.c = 1; |
Jeff Dike | 6c29256c | 2006-03-27 01:14:37 -0800 | [diff] [blame] | 1338 | fd = open_ubd_file(cow_file, &flags, 0, NULL, NULL, NULL, NULL, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1339 | if(fd < 0){ |
| 1340 | err = fd; |
| 1341 | printk("Open of COW file '%s' failed, errno = %d\n", cow_file, |
| 1342 | -err); |
| 1343 | goto out; |
| 1344 | } |
| 1345 | |
| 1346 | err = init_cow_file(fd, cow_file, backing_file, sectorsize, alignment, |
| 1347 | bitmap_offset_out, bitmap_len_out, |
| 1348 | data_offset_out); |
| 1349 | if(!err) |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 1350 | return fd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1351 | os_close_file(fd); |
| 1352 | out: |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 1353 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1354 | } |
| 1355 | |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1356 | static int update_bitmap(struct io_thread_req *req) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1357 | { |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1358 | int n; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1359 | |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1360 | if(req->cow_offset == -1) |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 1361 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1362 | |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1363 | n = os_seek_file(req->fds[1], req->cow_offset); |
| 1364 | if(n < 0){ |
| 1365 | printk("do_io - bitmap lseek failed : err = %d\n", -n); |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 1366 | return 1; |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1367 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1368 | |
Jeff Dike | a6ea4cc | 2007-05-06 14:51:43 -0700 | [diff] [blame] | 1369 | n = os_write_file(req->fds[1], &req->bitmap_words, |
| 1370 | sizeof(req->bitmap_words)); |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1371 | if(n != sizeof(req->bitmap_words)){ |
| 1372 | printk("do_io - bitmap update failed, err = %d fd = %d\n", -n, |
| 1373 | req->fds[1]); |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 1374 | return 1; |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1375 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1376 | |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 1377 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1378 | } |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1379 | |
| 1380 | void do_io(struct io_thread_req *req) |
| 1381 | { |
| 1382 | char *buf; |
| 1383 | unsigned long len; |
| 1384 | int n, nsectors, start, end, bit; |
| 1385 | int err; |
| 1386 | __u64 off; |
| 1387 | |
| 1388 | nsectors = req->length / req->sectorsize; |
| 1389 | start = 0; |
| 1390 | do { |
| 1391 | bit = ubd_test_bit(start, (unsigned char *) &req->sector_mask); |
| 1392 | end = start; |
| 1393 | while((end < nsectors) && |
| 1394 | (ubd_test_bit(end, (unsigned char *) |
| 1395 | &req->sector_mask) == bit)) |
| 1396 | end++; |
| 1397 | |
| 1398 | off = req->offset + req->offsets[bit] + |
| 1399 | start * req->sectorsize; |
| 1400 | len = (end - start) * req->sectorsize; |
| 1401 | buf = &req->buffer[start * req->sectorsize]; |
| 1402 | |
| 1403 | err = os_seek_file(req->fds[bit], off); |
| 1404 | if(err < 0){ |
| 1405 | printk("do_io - lseek failed : err = %d\n", -err); |
| 1406 | req->error = 1; |
| 1407 | return; |
| 1408 | } |
| 1409 | if(req->op == UBD_READ){ |
| 1410 | n = 0; |
| 1411 | do { |
| 1412 | buf = &buf[n]; |
| 1413 | len -= n; |
Jeff Dike | a6ea4cc | 2007-05-06 14:51:43 -0700 | [diff] [blame] | 1414 | n = os_read_file(req->fds[bit], buf, len); |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1415 | if (n < 0) { |
| 1416 | printk("do_io - read failed, err = %d " |
| 1417 | "fd = %d\n", -n, req->fds[bit]); |
| 1418 | req->error = 1; |
| 1419 | return; |
| 1420 | } |
| 1421 | } while((n < len) && (n != 0)); |
| 1422 | if (n < len) memset(&buf[n], 0, len - n); |
| 1423 | } else { |
Jeff Dike | a6ea4cc | 2007-05-06 14:51:43 -0700 | [diff] [blame] | 1424 | n = os_write_file(req->fds[bit], buf, len); |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1425 | if(n != len){ |
| 1426 | printk("do_io - write failed err = %d " |
| 1427 | "fd = %d\n", -n, req->fds[bit]); |
| 1428 | req->error = 1; |
| 1429 | return; |
| 1430 | } |
| 1431 | } |
| 1432 | |
| 1433 | start = end; |
| 1434 | } while(start < nsectors); |
| 1435 | |
| 1436 | req->error = update_bitmap(req); |
| 1437 | } |
| 1438 | |
| 1439 | /* Changed in start_io_thread, which is serialized by being called only |
| 1440 | * from ubd_init, which is an initcall. |
| 1441 | */ |
| 1442 | int kernel_fd = -1; |
| 1443 | |
Paolo 'Blaisorblade' Giarrusso | d8d7c28 | 2006-10-30 22:07:12 -0800 | [diff] [blame] | 1444 | /* Only changed by the io thread. XXX: currently unused. */ |
| 1445 | static int io_count = 0; |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1446 | |
| 1447 | int io_thread(void *arg) |
| 1448 | { |
Jeff Dike | 2adcec2 | 2007-05-06 14:51:37 -0700 | [diff] [blame] | 1449 | struct io_thread_req *req; |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1450 | int n; |
| 1451 | |
| 1452 | ignore_sigwinch_sig(); |
| 1453 | while(1){ |
Jeff Dike | a6ea4cc | 2007-05-06 14:51:43 -0700 | [diff] [blame] | 1454 | n = os_read_file(kernel_fd, &req, |
Jeff Dike | 2adcec2 | 2007-05-06 14:51:37 -0700 | [diff] [blame] | 1455 | sizeof(struct io_thread_req *)); |
| 1456 | if(n != sizeof(struct io_thread_req *)){ |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1457 | if(n < 0) |
| 1458 | printk("io_thread - read failed, fd = %d, " |
| 1459 | "err = %d\n", kernel_fd, -n); |
| 1460 | else { |
| 1461 | printk("io_thread - short read, fd = %d, " |
| 1462 | "length = %d\n", kernel_fd, n); |
| 1463 | } |
| 1464 | continue; |
| 1465 | } |
| 1466 | io_count++; |
Jeff Dike | 2adcec2 | 2007-05-06 14:51:37 -0700 | [diff] [blame] | 1467 | do_io(req); |
Jeff Dike | a6ea4cc | 2007-05-06 14:51:43 -0700 | [diff] [blame] | 1468 | n = os_write_file(kernel_fd, &req, |
Jeff Dike | 2adcec2 | 2007-05-06 14:51:37 -0700 | [diff] [blame] | 1469 | sizeof(struct io_thread_req *)); |
| 1470 | if(n != sizeof(struct io_thread_req *)) |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1471 | printk("io_thread - write failed, fd = %d, err = %d\n", |
| 1472 | kernel_fd, -n); |
| 1473 | } |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1474 | |
Jeff Dike | 1b57e9c | 2006-01-06 00:18:49 -0800 | [diff] [blame] | 1475 | return 0; |
| 1476 | } |