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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | #define UBD_SHIFT 4 |
| 21 | |
Jeff Dike | e16f535 | 2007-06-08 13:46:54 -0700 | [diff] [blame] | 22 | #include "linux/kernel.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | #include "linux/module.h" |
| 24 | #include "linux/blkdev.h" |
Bartlomiej Zolnierkiewicz | 73855e1 | 2009-04-01 21:42:21 +0200 | [diff] [blame] | 25 | #include "linux/ata.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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" |
Alexey Dobriyan | 6613c5e | 2009-12-14 18:00:11 -0800 | [diff] [blame] | 30 | #include "linux/seq_file.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | #include "linux/ctype.h" |
| 32 | #include "linux/capability.h" |
| 33 | #include "linux/mm.h" |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 34 | #include "linux/slab.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | #include "linux/vmalloc.h" |
Arnd Bergmann | 9a181c5 | 2010-09-11 18:38:03 +0200 | [diff] [blame] | 36 | #include "linux/mutex.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | #include "linux/blkpg.h" |
| 38 | #include "linux/genhd.h" |
| 39 | #include "linux/spinlock.h" |
Russell King | d052d1b | 2005-10-29 19:07:23 +0100 | [diff] [blame] | 40 | #include "linux/platform_device.h" |
WANG Cong | 23464ff | 2007-10-24 13:07:11 +0200 | [diff] [blame] | 41 | #include "linux/scatterlist.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | #include "asm/segment.h" |
| 43 | #include "asm/uaccess.h" |
| 44 | #include "asm/irq.h" |
| 45 | #include "asm/types.h" |
| 46 | #include "asm/tlbflush.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | #include "mem_user.h" |
| 48 | #include "kern_util.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | #include "mconsole_kern.h" |
| 50 | #include "init.h" |
| 51 | #include "irq_user.h" |
| 52 | #include "irq_kern.h" |
| 53 | #include "ubd_user.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | #include "os.h" |
| 55 | #include "mem.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | #include "cow.h" |
| 57 | |
Jeff Dike | 7b9014c | 2005-05-20 13:59:11 -0700 | [diff] [blame] | 58 | enum ubd_req { UBD_READ, UBD_WRITE }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | |
| 60 | struct io_thread_req { |
Jeff Dike | 62f96cb | 2007-02-10 01:44:16 -0800 | [diff] [blame] | 61 | struct request *req; |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 62 | enum ubd_req op; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | int fds[2]; |
| 64 | unsigned long offsets[2]; |
| 65 | unsigned long long offset; |
| 66 | unsigned long length; |
| 67 | char *buffer; |
| 68 | int sectorsize; |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 69 | unsigned long sector_mask; |
| 70 | unsigned long long cow_offset; |
| 71 | unsigned long bitmap_words[2]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | int error; |
| 73 | }; |
| 74 | |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 75 | static inline int ubd_test_bit(__u64 bit, unsigned char *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | { |
| 77 | __u64 n; |
| 78 | int bits, off; |
| 79 | |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 80 | bits = sizeof(data[0]) * 8; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | n = bit / bits; |
| 82 | off = bit % bits; |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 83 | return (data[n] & (1 << off)) != 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | } |
| 85 | |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 86 | static inline void ubd_set_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 | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 94 | data[n] |= (1 << off); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | } |
| 96 | /*End stuff from ubd_user.h*/ |
| 97 | |
| 98 | #define DRIVER_NAME "uml-blkdev" |
| 99 | |
Paolo 'Blaisorblade' Giarrusso | d7fb2c3 | 2006-10-30 22:07:07 -0800 | [diff] [blame] | 100 | static DEFINE_MUTEX(ubd_lock); |
Arnd Bergmann | 9a181c5 | 2010-09-11 18:38:03 +0200 | [diff] [blame] | 101 | static DEFINE_MUTEX(ubd_mutex); /* replaces BKL, might not be needed */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | |
Al Viro | a625c99 | 2008-03-02 09:16:26 -0500 | [diff] [blame] | 103 | static int ubd_open(struct block_device *bdev, fmode_t mode); |
| 104 | static int ubd_release(struct gendisk *disk, fmode_t mode); |
| 105 | static int ubd_ioctl(struct block_device *bdev, fmode_t mode, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | unsigned int cmd, unsigned long arg); |
Christoph Hellwig | a885c8c | 2006-01-08 01:02:50 -0800 | [diff] [blame] | 107 | static int ubd_getgeo(struct block_device *bdev, struct hd_geometry *geo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | |
Paolo 'Blaisorblade' Giarrusso | 97d88ac | 2006-10-30 22:07:03 -0800 | [diff] [blame] | 109 | #define MAX_DEV (16) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | |
Alexey Dobriyan | 83d5cde | 2009-09-21 17:01:13 -0700 | [diff] [blame] | 111 | static const struct block_device_operations ubd_blops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | .owner = THIS_MODULE, |
Al Viro | a625c99 | 2008-03-02 09:16:26 -0500 | [diff] [blame] | 113 | .open = ubd_open, |
| 114 | .release = ubd_release, |
| 115 | .ioctl = ubd_ioctl, |
Christoph Hellwig | a885c8c | 2006-01-08 01:02:50 -0800 | [diff] [blame] | 116 | .getgeo = ubd_getgeo, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 117 | }; |
| 118 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | /* Protected by ubd_lock */ |
Christoph Hellwig | 792dd4f | 2009-03-31 15:23:39 -0700 | [diff] [blame] | 120 | static int fake_major = UBD_MAJOR; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | static struct gendisk *ubd_gendisk[MAX_DEV]; |
| 122 | static struct gendisk *fake_gendisk[MAX_DEV]; |
Jeff Dike | 6c29256c | 2006-03-27 01:14:37 -0800 | [diff] [blame] | 123 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | #ifdef CONFIG_BLK_DEV_UBD_SYNC |
| 125 | #define OPEN_FLAGS ((struct openflags) { .r = 1, .w = 1, .s = 1, .c = 0, \ |
| 126 | .cl = 1 }) |
| 127 | #else |
| 128 | #define OPEN_FLAGS ((struct openflags) { .r = 1, .w = 1, .s = 0, .c = 0, \ |
| 129 | .cl = 1 }) |
| 130 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 131 | static struct openflags global_openflags = OPEN_FLAGS; |
| 132 | |
| 133 | struct cow { |
Paolo 'Blaisorblade' Giarrusso | 2a9d32f | 2006-10-30 22:07:04 -0800 | [diff] [blame] | 134 | /* backing file name */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 135 | char *file; |
Paolo 'Blaisorblade' Giarrusso | 2a9d32f | 2006-10-30 22:07:04 -0800 | [diff] [blame] | 136 | /* backing file fd */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 137 | int fd; |
| 138 | unsigned long *bitmap; |
| 139 | unsigned long bitmap_len; |
| 140 | int bitmap_offset; |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 141 | int data_offset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | }; |
| 143 | |
Jeff Dike | a0044bd | 2007-05-06 14:51:36 -0700 | [diff] [blame] | 144 | #define MAX_SG 64 |
| 145 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | struct ubd { |
Jeff Dike | a0044bd | 2007-05-06 14:51:36 -0700 | [diff] [blame] | 147 | struct list_head restart; |
Paolo 'Blaisorblade' Giarrusso | 2a9d32f | 2006-10-30 22:07:04 -0800 | [diff] [blame] | 148 | /* name (and fd, below) of the file opened for writing, either the |
| 149 | * backing or the cow file. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 150 | char *file; |
| 151 | int count; |
| 152 | int fd; |
| 153 | __u64 size; |
| 154 | struct openflags boot_openflags; |
| 155 | struct openflags openflags; |
Paolo 'Blaisorblade' Giarrusso | 84e945e | 2006-10-30 22:07:10 -0800 | [diff] [blame] | 156 | unsigned shared:1; |
| 157 | unsigned no_cow:1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 158 | struct cow cow; |
| 159 | struct platform_device pdev; |
Jeff Dike | 62f96cb | 2007-02-10 01:44:16 -0800 | [diff] [blame] | 160 | struct request_queue *queue; |
| 161 | spinlock_t lock; |
Jeff Dike | a0044bd | 2007-05-06 14:51:36 -0700 | [diff] [blame] | 162 | struct scatterlist sg[MAX_SG]; |
| 163 | struct request *request; |
| 164 | int start_sg, end_sg; |
Tejun Heo | 4752690 | 2010-10-15 12:56:21 +0200 | [diff] [blame] | 165 | sector_t rq_pos; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | }; |
| 167 | |
| 168 | #define DEFAULT_COW { \ |
| 169 | .file = NULL, \ |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 170 | .fd = -1, \ |
| 171 | .bitmap = NULL, \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 172 | .bitmap_offset = 0, \ |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 173 | .data_offset = 0, \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 174 | } |
| 175 | |
| 176 | #define DEFAULT_UBD { \ |
| 177 | .file = NULL, \ |
| 178 | .count = 0, \ |
| 179 | .fd = -1, \ |
| 180 | .size = -1, \ |
| 181 | .boot_openflags = OPEN_FLAGS, \ |
| 182 | .openflags = OPEN_FLAGS, \ |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 183 | .no_cow = 0, \ |
Jeff Dike | 6c29256c | 2006-03-27 01:14:37 -0800 | [diff] [blame] | 184 | .shared = 0, \ |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 185 | .cow = DEFAULT_COW, \ |
Thomas Gleixner | 22e6500 | 2011-01-23 15:21:25 +0100 | [diff] [blame] | 186 | .lock = __SPIN_LOCK_UNLOCKED(ubd_devs.lock), \ |
Jeff Dike | a0044bd | 2007-05-06 14:51:36 -0700 | [diff] [blame] | 187 | .request = NULL, \ |
| 188 | .start_sg = 0, \ |
| 189 | .end_sg = 0, \ |
Tejun Heo | 4752690 | 2010-10-15 12:56:21 +0200 | [diff] [blame] | 190 | .rq_pos = 0, \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 191 | } |
| 192 | |
Jeff Dike | b8831a1 | 2007-02-10 01:44:17 -0800 | [diff] [blame] | 193 | /* Protected by ubd_lock */ |
WANG Cong | 5dc62b1 | 2008-04-28 02:13:58 -0700 | [diff] [blame] | 194 | static struct ubd ubd_devs[MAX_DEV] = { [0 ... MAX_DEV - 1] = DEFAULT_UBD }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 195 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 196 | /* Only changed by fake_ide_setup which is a setup */ |
| 197 | static int fake_ide = 0; |
| 198 | static struct proc_dir_entry *proc_ide_root = NULL; |
| 199 | static struct proc_dir_entry *proc_ide = NULL; |
| 200 | |
| 201 | static void make_proc_ide(void) |
| 202 | { |
| 203 | proc_ide_root = proc_mkdir("ide", NULL); |
| 204 | proc_ide = proc_mkdir("ide0", proc_ide_root); |
| 205 | } |
| 206 | |
Alexey Dobriyan | 6613c5e | 2009-12-14 18:00:11 -0800 | [diff] [blame] | 207 | static int fake_ide_media_proc_show(struct seq_file *m, void *v) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 208 | { |
Alexey Dobriyan | 6613c5e | 2009-12-14 18:00:11 -0800 | [diff] [blame] | 209 | seq_puts(m, "disk\n"); |
| 210 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | } |
| 212 | |
Alexey Dobriyan | 6613c5e | 2009-12-14 18:00:11 -0800 | [diff] [blame] | 213 | static int fake_ide_media_proc_open(struct inode *inode, struct file *file) |
| 214 | { |
| 215 | return single_open(file, fake_ide_media_proc_show, NULL); |
| 216 | } |
| 217 | |
| 218 | static const struct file_operations fake_ide_media_proc_fops = { |
| 219 | .owner = THIS_MODULE, |
| 220 | .open = fake_ide_media_proc_open, |
| 221 | .read = seq_read, |
| 222 | .llseek = seq_lseek, |
| 223 | .release = single_release, |
| 224 | }; |
| 225 | |
WANG Cong | c0a9290 | 2008-02-04 22:30:41 -0800 | [diff] [blame] | 226 | static void make_ide_entries(const char *dev_name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 227 | { |
| 228 | struct proc_dir_entry *dir, *ent; |
| 229 | char name[64]; |
| 230 | |
| 231 | if(proc_ide_root == NULL) make_proc_ide(); |
| 232 | |
| 233 | dir = proc_mkdir(dev_name, proc_ide); |
| 234 | if(!dir) return; |
| 235 | |
Alexey Dobriyan | 6613c5e | 2009-12-14 18:00:11 -0800 | [diff] [blame] | 236 | ent = proc_create("media", S_IRUGO, dir, &fake_ide_media_proc_fops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 237 | if(!ent) return; |
WANG Cong | c0a9290 | 2008-02-04 22:30:41 -0800 | [diff] [blame] | 238 | snprintf(name, sizeof(name), "ide0/%s", dev_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 239 | proc_symlink(dev_name, proc_ide_root, name); |
| 240 | } |
| 241 | |
| 242 | static int fake_ide_setup(char *str) |
| 243 | { |
| 244 | fake_ide = 1; |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 245 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 246 | } |
| 247 | |
| 248 | __setup("fake_ide", fake_ide_setup); |
| 249 | |
| 250 | __uml_help(fake_ide_setup, |
| 251 | "fake_ide\n" |
| 252 | " Create ide0 entries that map onto ubd devices.\n\n" |
| 253 | ); |
| 254 | |
| 255 | static int parse_unit(char **ptr) |
| 256 | { |
| 257 | char *str = *ptr, *end; |
| 258 | int n = -1; |
| 259 | |
| 260 | if(isdigit(*str)) { |
| 261 | n = simple_strtoul(str, &end, 0); |
| 262 | if(end == str) |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 263 | return -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 264 | *ptr = end; |
| 265 | } |
Paolo 'Blaisorblade' Giarrusso | 97d88ac | 2006-10-30 22:07:03 -0800 | [diff] [blame] | 266 | else if (('a' <= *str) && (*str <= 'z')) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | n = *str - 'a'; |
| 268 | str++; |
| 269 | *ptr = str; |
| 270 | } |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 271 | return n; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 272 | } |
| 273 | |
Paolo 'Blaisorblade' Giarrusso | d8d7c28 | 2006-10-30 22:07:12 -0800 | [diff] [blame] | 274 | /* If *index_out == -1 at exit, the passed option was a general one; |
| 275 | * otherwise, the str pointer is used (and owned) inside ubd_devs array, so it |
| 276 | * should not be freed on exit. |
| 277 | */ |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 278 | 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] | 279 | { |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 280 | struct ubd *ubd_dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | struct openflags flags = global_openflags; |
| 282 | char *backing_file; |
Jeff Dike | b8831a1 | 2007-02-10 01:44:17 -0800 | [diff] [blame] | 283 | int n, err = 0, i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 284 | |
| 285 | if(index_out) *index_out = -1; |
| 286 | n = *str; |
| 287 | if(n == '='){ |
| 288 | char *end; |
| 289 | int major; |
| 290 | |
| 291 | str++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 292 | if(!strcmp(str, "sync")){ |
| 293 | global_openflags = of_sync(global_openflags); |
Jeff Dike | b8831a1 | 2007-02-10 01:44:17 -0800 | [diff] [blame] | 294 | goto out1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 295 | } |
| 296 | |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 297 | err = -EINVAL; |
Jeff Dike | b8831a1 | 2007-02-10 01:44:17 -0800 | [diff] [blame] | 298 | major = simple_strtoul(str, &end, 0); |
| 299 | if((*end != '\0') || (end == str)){ |
| 300 | *error_out = "Didn't parse major number"; |
| 301 | goto out1; |
| 302 | } |
| 303 | |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 304 | mutex_lock(&ubd_lock); |
Christoph Hellwig | 792dd4f | 2009-03-31 15:23:39 -0700 | [diff] [blame] | 305 | if (fake_major != UBD_MAJOR) { |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 306 | *error_out = "Can't assign a fake major twice"; |
| 307 | goto out1; |
| 308 | } |
Jeff Dike | 6c29256c | 2006-03-27 01:14:37 -0800 | [diff] [blame] | 309 | |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 310 | fake_major = major; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 311 | |
| 312 | printk(KERN_INFO "Setting extra ubd major number to %d\n", |
| 313 | major); |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 314 | err = 0; |
| 315 | out1: |
| 316 | mutex_unlock(&ubd_lock); |
| 317 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 318 | } |
| 319 | |
| 320 | n = parse_unit(&str); |
| 321 | if(n < 0){ |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 322 | *error_out = "Couldn't parse device number"; |
| 323 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 324 | } |
| 325 | if(n >= MAX_DEV){ |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 326 | *error_out = "Device number out of range"; |
| 327 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 328 | } |
| 329 | |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 330 | err = -EBUSY; |
Paolo 'Blaisorblade' Giarrusso | d7fb2c3 | 2006-10-30 22:07:07 -0800 | [diff] [blame] | 331 | mutex_lock(&ubd_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 332 | |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 333 | ubd_dev = &ubd_devs[n]; |
| 334 | if(ubd_dev->file != NULL){ |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 335 | *error_out = "Device is already configured"; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 336 | goto out; |
| 337 | } |
| 338 | |
| 339 | if (index_out) |
| 340 | *index_out = n; |
| 341 | |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 342 | err = -EINVAL; |
Jeff Dike | 6c29256c | 2006-03-27 01:14:37 -0800 | [diff] [blame] | 343 | for (i = 0; i < sizeof("rscd="); i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 344 | switch (*str) { |
| 345 | case 'r': |
| 346 | flags.w = 0; |
| 347 | break; |
| 348 | case 's': |
| 349 | flags.s = 1; |
| 350 | break; |
| 351 | case 'd': |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 352 | ubd_dev->no_cow = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 353 | break; |
Jeff Dike | 6c29256c | 2006-03-27 01:14:37 -0800 | [diff] [blame] | 354 | case 'c': |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 355 | ubd_dev->shared = 1; |
Jeff Dike | 6c29256c | 2006-03-27 01:14:37 -0800 | [diff] [blame] | 356 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 357 | case '=': |
| 358 | str++; |
| 359 | goto break_loop; |
| 360 | default: |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 361 | *error_out = "Expected '=' or flag letter " |
| 362 | "(r, s, c, or d)"; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 363 | goto out; |
| 364 | } |
| 365 | str++; |
| 366 | } |
| 367 | |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 368 | if (*str == '=') |
| 369 | *error_out = "Too many flags specified"; |
| 370 | else |
| 371 | *error_out = "Missing '='"; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 372 | goto out; |
| 373 | |
| 374 | break_loop: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 375 | backing_file = strchr(str, ','); |
| 376 | |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 377 | if (backing_file == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 378 | backing_file = strchr(str, ':'); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 380 | if(backing_file != NULL){ |
| 381 | if(ubd_dev->no_cow){ |
| 382 | *error_out = "Can't specify both 'd' and a cow file"; |
| 383 | goto out; |
| 384 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 385 | else { |
| 386 | *backing_file = '\0'; |
| 387 | backing_file++; |
| 388 | } |
| 389 | } |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 390 | err = 0; |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 391 | ubd_dev->file = str; |
| 392 | ubd_dev->cow.file = backing_file; |
| 393 | ubd_dev->boot_openflags = flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 394 | out: |
Paolo 'Blaisorblade' Giarrusso | d7fb2c3 | 2006-10-30 22:07:07 -0800 | [diff] [blame] | 395 | mutex_unlock(&ubd_lock); |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 396 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 397 | } |
| 398 | |
| 399 | static int ubd_setup(char *str) |
| 400 | { |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 401 | char *error; |
| 402 | int err; |
| 403 | |
| 404 | err = ubd_setup_common(str, NULL, &error); |
| 405 | if(err) |
| 406 | printk(KERN_ERR "Failed to initialize device with \"%s\" : " |
| 407 | "%s\n", str, error); |
| 408 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 409 | } |
| 410 | |
| 411 | __setup("ubd", ubd_setup); |
| 412 | __uml_help(ubd_setup, |
| 413 | "ubd<n><flags>=<filename>[(:|,)<filename2>]\n" |
| 414 | " This is used to associate a device with a file in the underlying\n" |
| 415 | " filesystem. When specifying two filenames, the first one is the\n" |
| 416 | " COW name and the second is the backing file name. As separator you can\n" |
| 417 | " use either a ':' or a ',': the first one allows writing things like;\n" |
| 418 | " ubd0=~/Uml/root_cow:~/Uml/root_backing_file\n" |
| 419 | " while with a ',' the shell would not expand the 2nd '~'.\n" |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 420 | " 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] | 421 | " a COW file or a backing file. To override this detection, add the 'd'\n" |
| 422 | " flag:\n" |
| 423 | " ubd0d=BackingFile\n" |
| 424 | " Usually, there is a filesystem in the file, but \n" |
| 425 | " that's not required. Swap devices containing swap files can be\n" |
| 426 | " specified like this. Also, a file which doesn't contain a\n" |
| 427 | " filesystem can have its contents read in the virtual \n" |
| 428 | " machine by running 'dd' on the device. <n> must be in the range\n" |
| 429 | " 0 to 7. Appending an 'r' to the number will cause that device\n" |
| 430 | " to be mounted read-only. For example ubd1r=./ext_fs. Appending\n" |
Jeff Dike | 20ede45 | 2008-02-04 22:30:37 -0800 | [diff] [blame] | 431 | " an 's' will cause data to be written to disk on the host immediately.\n" |
| 432 | " 'c' will cause the device to be treated as being shared between multiple\n" |
| 433 | " UMLs and file locking will be turned off - this is appropriate for a\n" |
| 434 | " cluster filesystem and inappropriate at almost all other times.\n\n" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 435 | ); |
| 436 | |
Jeff Dike | 8299ca5 | 2008-02-04 22:30:48 -0800 | [diff] [blame] | 437 | static int udb_setup(char *str) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 438 | { |
| 439 | printk("udb%s specified on command line is almost certainly a ubd -> " |
| 440 | "udb TYPO\n", str); |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 441 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 442 | } |
| 443 | |
| 444 | __setup("udb", udb_setup); |
| 445 | __uml_help(udb_setup, |
| 446 | "udb\n" |
Jeff Dike | 0894e27 | 2005-05-28 15:51:55 -0700 | [diff] [blame] | 447 | " This option is here solely to catch ubd -> udb typos, which can be\n" |
| 448 | " to impossible to catch visually unless you specifically look for\n" |
| 449 | " 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] | 450 | " in the boot output.\n\n" |
| 451 | ); |
| 452 | |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 453 | static void do_ubd_request(struct request_queue * q); |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 454 | |
| 455 | /* Only changed by ubd_init, which is an initcall. */ |
WANG Cong | 5dc62b1 | 2008-04-28 02:13:58 -0700 | [diff] [blame] | 456 | static int thread_fd = -1; |
Jeff Dike | a0044bd | 2007-05-06 14:51:36 -0700 | [diff] [blame] | 457 | static LIST_HEAD(restart); |
| 458 | |
Paolo 'Blaisorblade' Giarrusso | 2fe30a3 | 2006-10-30 22:07:09 -0800 | [diff] [blame] | 459 | /* XXX - move this inside ubd_intr. */ |
Jeff Dike | 62f96cb | 2007-02-10 01:44:16 -0800 | [diff] [blame] | 460 | /* Called without dev->lock held, and only in interrupt context. */ |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 461 | static void ubd_handler(void) |
| 462 | { |
Jeff Dike | 2adcec2 | 2007-05-06 14:51:37 -0700 | [diff] [blame] | 463 | struct io_thread_req *req; |
Jeff Dike | a0044bd | 2007-05-06 14:51:36 -0700 | [diff] [blame] | 464 | struct ubd *ubd; |
| 465 | struct list_head *list, *next_ele; |
| 466 | unsigned long flags; |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 467 | int n; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 468 | |
Jeff Dike | a0044bd | 2007-05-06 14:51:36 -0700 | [diff] [blame] | 469 | while(1){ |
Jeff Dike | a6ea4cc | 2007-05-06 14:51:43 -0700 | [diff] [blame] | 470 | n = os_read_file(thread_fd, &req, |
| 471 | sizeof(struct io_thread_req *)); |
Jeff Dike | a0044bd | 2007-05-06 14:51:36 -0700 | [diff] [blame] | 472 | if(n != sizeof(req)){ |
| 473 | if(n == -EAGAIN) |
| 474 | break; |
| 475 | printk(KERN_ERR "spurious interrupt in ubd_handler, " |
| 476 | "err = %d\n", -n); |
| 477 | return; |
| 478 | } |
| 479 | |
Tejun Heo | 4d6c84d | 2009-04-28 13:06:09 +0900 | [diff] [blame] | 480 | blk_end_request(req->req, 0, req->length); |
Jeff Dike | 2adcec2 | 2007-05-06 14:51:37 -0700 | [diff] [blame] | 481 | kfree(req); |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 482 | } |
Jeff Dike | 62f96cb | 2007-02-10 01:44:16 -0800 | [diff] [blame] | 483 | reactivate_fd(thread_fd, UBD_IRQ); |
Jeff Dike | a0044bd | 2007-05-06 14:51:36 -0700 | [diff] [blame] | 484 | |
| 485 | list_for_each_safe(list, next_ele, &restart){ |
| 486 | ubd = container_of(list, struct ubd, restart); |
| 487 | list_del_init(&ubd->restart); |
| 488 | spin_lock_irqsave(&ubd->lock, flags); |
| 489 | do_ubd_request(ubd->queue); |
| 490 | spin_unlock_irqrestore(&ubd->lock, flags); |
| 491 | } |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 492 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 493 | |
Al Viro | 7bea96f | 2006-10-08 22:49:34 +0100 | [diff] [blame] | 494 | static irqreturn_t ubd_intr(int irq, void *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 495 | { |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 496 | ubd_handler(); |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 497 | return IRQ_HANDLED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 498 | } |
| 499 | |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 500 | /* Only changed by ubd_init, which is an initcall. */ |
| 501 | static int io_pid = -1; |
| 502 | |
WANG Cong | 5dc62b1 | 2008-04-28 02:13:58 -0700 | [diff] [blame] | 503 | static void kill_io_thread(void) |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 504 | { |
Jeff Dike | 6c29256c | 2006-03-27 01:14:37 -0800 | [diff] [blame] | 505 | if(io_pid != -1) |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 506 | os_kill_process(io_pid, 1); |
| 507 | } |
| 508 | |
| 509 | __uml_exitcall(kill_io_thread); |
| 510 | |
Paolo 'Blaisorblade' Giarrusso | d8d7c28 | 2006-10-30 22:07:12 -0800 | [diff] [blame] | 511 | 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] | 512 | { |
| 513 | char *file; |
Richard Weinberger | 8535639 | 2011-11-02 13:17:27 +0100 | [diff] [blame] | 514 | int fd; |
| 515 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 516 | |
Richard Weinberger | 8535639 | 2011-11-02 13:17:27 +0100 | [diff] [blame] | 517 | __u32 version; |
| 518 | __u32 align; |
| 519 | char *backing_file; |
| 520 | time_t mtime; |
| 521 | unsigned long long size; |
| 522 | int sector_size; |
| 523 | int bitmap_offset; |
| 524 | |
| 525 | if (ubd_dev->file && ubd_dev->cow.file) { |
| 526 | file = ubd_dev->cow.file; |
| 527 | |
| 528 | goto out; |
| 529 | } |
| 530 | |
| 531 | fd = os_open_file(ubd_dev->file, global_openflags, 0); |
| 532 | if (fd < 0) |
| 533 | return fd; |
| 534 | |
| 535 | err = read_cow_header(file_reader, &fd, &version, &backing_file, \ |
| 536 | &mtime, &size, §or_size, &align, &bitmap_offset); |
| 537 | os_close_file(fd); |
| 538 | |
| 539 | if(err == -EINVAL) |
| 540 | file = ubd_dev->file; |
| 541 | else |
| 542 | file = backing_file; |
| 543 | |
| 544 | out: |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 545 | return os_file_size(file, size_out); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 546 | } |
| 547 | |
WANG Cong | 5dc62b1 | 2008-04-28 02:13:58 -0700 | [diff] [blame] | 548 | static int read_cow_bitmap(int fd, void *buf, int offset, int len) |
| 549 | { |
| 550 | int err; |
| 551 | |
| 552 | err = os_seek_file(fd, offset); |
| 553 | if (err < 0) |
| 554 | return err; |
| 555 | |
| 556 | err = os_read_file(fd, buf, len); |
| 557 | if (err < 0) |
| 558 | return err; |
| 559 | |
| 560 | return 0; |
| 561 | } |
| 562 | |
| 563 | static int backing_file_mismatch(char *file, __u64 size, time_t mtime) |
| 564 | { |
| 565 | unsigned long modtime; |
| 566 | unsigned long long actual; |
| 567 | int err; |
| 568 | |
| 569 | err = os_file_modtime(file, &modtime); |
| 570 | if (err < 0) { |
| 571 | printk(KERN_ERR "Failed to get modification time of backing " |
| 572 | "file \"%s\", err = %d\n", file, -err); |
| 573 | return err; |
| 574 | } |
| 575 | |
| 576 | err = os_file_size(file, &actual); |
| 577 | if (err < 0) { |
| 578 | printk(KERN_ERR "Failed to get size of backing file \"%s\", " |
| 579 | "err = %d\n", file, -err); |
| 580 | return err; |
| 581 | } |
| 582 | |
| 583 | if (actual != size) { |
| 584 | /*__u64 can be a long on AMD64 and with %lu GCC complains; so |
| 585 | * the typecast.*/ |
| 586 | printk(KERN_ERR "Size mismatch (%llu vs %llu) of COW header " |
| 587 | "vs backing file\n", (unsigned long long) size, actual); |
| 588 | return -EINVAL; |
| 589 | } |
| 590 | if (modtime != mtime) { |
| 591 | printk(KERN_ERR "mtime mismatch (%ld vs %ld) of COW header vs " |
| 592 | "backing file\n", mtime, modtime); |
| 593 | return -EINVAL; |
| 594 | } |
| 595 | return 0; |
| 596 | } |
| 597 | |
| 598 | static int path_requires_switch(char *from_cmdline, char *from_cow, char *cow) |
| 599 | { |
| 600 | struct uml_stat buf1, buf2; |
| 601 | int err; |
| 602 | |
| 603 | if (from_cmdline == NULL) |
| 604 | return 0; |
| 605 | if (!strcmp(from_cmdline, from_cow)) |
| 606 | return 0; |
| 607 | |
| 608 | err = os_stat_file(from_cmdline, &buf1); |
| 609 | if (err < 0) { |
| 610 | printk(KERN_ERR "Couldn't stat '%s', err = %d\n", from_cmdline, |
| 611 | -err); |
| 612 | return 0; |
| 613 | } |
| 614 | err = os_stat_file(from_cow, &buf2); |
| 615 | if (err < 0) { |
| 616 | printk(KERN_ERR "Couldn't stat '%s', err = %d\n", from_cow, |
| 617 | -err); |
| 618 | return 1; |
| 619 | } |
| 620 | if ((buf1.ust_dev == buf2.ust_dev) && (buf1.ust_ino == buf2.ust_ino)) |
| 621 | return 0; |
| 622 | |
| 623 | printk(KERN_ERR "Backing file mismatch - \"%s\" requested, " |
| 624 | "\"%s\" specified in COW header of \"%s\"\n", |
| 625 | from_cmdline, from_cow, cow); |
| 626 | return 1; |
| 627 | } |
| 628 | |
| 629 | static int open_ubd_file(char *file, struct openflags *openflags, int shared, |
| 630 | char **backing_file_out, int *bitmap_offset_out, |
| 631 | unsigned long *bitmap_len_out, int *data_offset_out, |
| 632 | int *create_cow_out) |
| 633 | { |
| 634 | time_t mtime; |
| 635 | unsigned long long size; |
| 636 | __u32 version, align; |
| 637 | char *backing_file; |
| 638 | int fd, err, sectorsize, asked_switch, mode = 0644; |
| 639 | |
| 640 | fd = os_open_file(file, *openflags, mode); |
| 641 | if (fd < 0) { |
| 642 | if ((fd == -ENOENT) && (create_cow_out != NULL)) |
| 643 | *create_cow_out = 1; |
| 644 | if (!openflags->w || |
| 645 | ((fd != -EROFS) && (fd != -EACCES))) |
| 646 | return fd; |
| 647 | openflags->w = 0; |
| 648 | fd = os_open_file(file, *openflags, mode); |
| 649 | if (fd < 0) |
| 650 | return fd; |
| 651 | } |
| 652 | |
| 653 | if (shared) |
| 654 | printk(KERN_INFO "Not locking \"%s\" on the host\n", file); |
| 655 | else { |
| 656 | err = os_lock_file(fd, openflags->w); |
| 657 | if (err < 0) { |
| 658 | printk(KERN_ERR "Failed to lock '%s', err = %d\n", |
| 659 | file, -err); |
| 660 | goto out_close; |
| 661 | } |
| 662 | } |
| 663 | |
| 664 | /* Successful return case! */ |
| 665 | if (backing_file_out == NULL) |
| 666 | return fd; |
| 667 | |
| 668 | err = read_cow_header(file_reader, &fd, &version, &backing_file, &mtime, |
| 669 | &size, §orsize, &align, bitmap_offset_out); |
| 670 | if (err && (*backing_file_out != NULL)) { |
| 671 | printk(KERN_ERR "Failed to read COW header from COW file " |
| 672 | "\"%s\", errno = %d\n", file, -err); |
| 673 | goto out_close; |
| 674 | } |
| 675 | if (err) |
| 676 | return fd; |
| 677 | |
| 678 | asked_switch = path_requires_switch(*backing_file_out, backing_file, |
| 679 | file); |
| 680 | |
| 681 | /* Allow switching only if no mismatch. */ |
| 682 | if (asked_switch && !backing_file_mismatch(*backing_file_out, size, |
| 683 | mtime)) { |
| 684 | printk(KERN_ERR "Switching backing file to '%s'\n", |
| 685 | *backing_file_out); |
| 686 | err = write_cow_header(file, fd, *backing_file_out, |
| 687 | sectorsize, align, &size); |
| 688 | if (err) { |
| 689 | printk(KERN_ERR "Switch failed, errno = %d\n", -err); |
| 690 | goto out_close; |
| 691 | } |
| 692 | } else { |
| 693 | *backing_file_out = backing_file; |
| 694 | err = backing_file_mismatch(*backing_file_out, size, mtime); |
| 695 | if (err) |
| 696 | goto out_close; |
| 697 | } |
| 698 | |
| 699 | cow_sizes(version, size, sectorsize, align, *bitmap_offset_out, |
| 700 | bitmap_len_out, data_offset_out); |
| 701 | |
| 702 | return fd; |
| 703 | out_close: |
| 704 | os_close_file(fd); |
| 705 | return err; |
| 706 | } |
| 707 | |
| 708 | static int create_cow_file(char *cow_file, char *backing_file, |
| 709 | struct openflags flags, |
| 710 | int sectorsize, int alignment, int *bitmap_offset_out, |
| 711 | unsigned long *bitmap_len_out, int *data_offset_out) |
| 712 | { |
| 713 | int err, fd; |
| 714 | |
| 715 | flags.c = 1; |
| 716 | fd = open_ubd_file(cow_file, &flags, 0, NULL, NULL, NULL, NULL, NULL); |
| 717 | if (fd < 0) { |
| 718 | err = fd; |
| 719 | printk(KERN_ERR "Open of COW file '%s' failed, errno = %d\n", |
| 720 | cow_file, -err); |
| 721 | goto out; |
| 722 | } |
| 723 | |
| 724 | err = init_cow_file(fd, cow_file, backing_file, sectorsize, alignment, |
| 725 | bitmap_offset_out, bitmap_len_out, |
| 726 | data_offset_out); |
| 727 | if (!err) |
| 728 | return fd; |
| 729 | os_close_file(fd); |
| 730 | out: |
| 731 | return err; |
| 732 | } |
| 733 | |
Paolo 'Blaisorblade' Giarrusso | 5f75a4f | 2006-10-30 22:07:06 -0800 | [diff] [blame] | 734 | static void ubd_close_dev(struct ubd *ubd_dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 735 | { |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 736 | os_close_file(ubd_dev->fd); |
| 737 | if(ubd_dev->cow.file == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 738 | return; |
| 739 | |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 740 | os_close_file(ubd_dev->cow.fd); |
| 741 | vfree(ubd_dev->cow.bitmap); |
| 742 | ubd_dev->cow.bitmap = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 743 | } |
| 744 | |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 745 | static int ubd_open_dev(struct ubd *ubd_dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 746 | { |
| 747 | struct openflags flags; |
| 748 | char **back_ptr; |
| 749 | int err, create_cow, *create_ptr; |
Paolo 'Blaisorblade' Giarrusso | 0bf16bf | 2006-10-30 22:07:11 -0800 | [diff] [blame] | 750 | int fd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 751 | |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 752 | ubd_dev->openflags = ubd_dev->boot_openflags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 753 | create_cow = 0; |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 754 | create_ptr = (ubd_dev->cow.file != NULL) ? &create_cow : NULL; |
| 755 | back_ptr = ubd_dev->no_cow ? NULL : &ubd_dev->cow.file; |
Paolo 'Blaisorblade' Giarrusso | 0bf16bf | 2006-10-30 22:07:11 -0800 | [diff] [blame] | 756 | |
| 757 | 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] | 758 | back_ptr, &ubd_dev->cow.bitmap_offset, |
| 759 | &ubd_dev->cow.bitmap_len, &ubd_dev->cow.data_offset, |
Jeff Dike | 6c29256c | 2006-03-27 01:14:37 -0800 | [diff] [blame] | 760 | create_ptr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 761 | |
Paolo 'Blaisorblade' Giarrusso | 0bf16bf | 2006-10-30 22:07:11 -0800 | [diff] [blame] | 762 | if((fd == -ENOENT) && create_cow){ |
| 763 | fd = create_cow_file(ubd_dev->file, ubd_dev->cow.file, |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 764 | ubd_dev->openflags, 1 << 9, PAGE_SIZE, |
| 765 | &ubd_dev->cow.bitmap_offset, |
| 766 | &ubd_dev->cow.bitmap_len, |
| 767 | &ubd_dev->cow.data_offset); |
Paolo 'Blaisorblade' Giarrusso | 0bf16bf | 2006-10-30 22:07:11 -0800 | [diff] [blame] | 768 | if(fd >= 0){ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 769 | printk(KERN_INFO "Creating \"%s\" as COW file for " |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 770 | "\"%s\"\n", ubd_dev->file, ubd_dev->cow.file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 771 | } |
| 772 | } |
| 773 | |
Paolo 'Blaisorblade' Giarrusso | 0bf16bf | 2006-10-30 22:07:11 -0800 | [diff] [blame] | 774 | if(fd < 0){ |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 775 | printk("Failed to open '%s', errno = %d\n", ubd_dev->file, |
Paolo 'Blaisorblade' Giarrusso | 0bf16bf | 2006-10-30 22:07:11 -0800 | [diff] [blame] | 776 | -fd); |
| 777 | return fd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 778 | } |
Paolo 'Blaisorblade' Giarrusso | 0bf16bf | 2006-10-30 22:07:11 -0800 | [diff] [blame] | 779 | ubd_dev->fd = fd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 780 | |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 781 | if(ubd_dev->cow.file != NULL){ |
Martin K. Petersen | 086fa5f | 2010-02-26 00:20:38 -0500 | [diff] [blame] | 782 | blk_queue_max_hw_sectors(ubd_dev->queue, 8 * sizeof(long)); |
Jeff Dike | f4768ff | 2007-08-22 14:01:53 -0700 | [diff] [blame] | 783 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 784 | err = -ENOMEM; |
Jesper Juhl | da2486b | 2007-10-16 01:27:19 -0700 | [diff] [blame] | 785 | ubd_dev->cow.bitmap = vmalloc(ubd_dev->cow.bitmap_len); |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 786 | if(ubd_dev->cow.bitmap == NULL){ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 787 | printk(KERN_ERR "Failed to vmalloc COW bitmap\n"); |
| 788 | goto error; |
| 789 | } |
| 790 | flush_tlb_kernel_vm(); |
| 791 | |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 792 | err = read_cow_bitmap(ubd_dev->fd, ubd_dev->cow.bitmap, |
| 793 | ubd_dev->cow.bitmap_offset, |
| 794 | ubd_dev->cow.bitmap_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 795 | if(err < 0) |
| 796 | goto error; |
| 797 | |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 798 | flags = ubd_dev->openflags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 799 | flags.w = 0; |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 800 | 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] | 801 | NULL, NULL, NULL, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 802 | if(err < 0) goto error; |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 803 | ubd_dev->cow.fd = err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 804 | } |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 805 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 806 | error: |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 807 | os_close_file(ubd_dev->fd); |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 808 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 809 | } |
| 810 | |
Jeff Dike | 2e3f525 | 2007-05-06 14:51:29 -0700 | [diff] [blame] | 811 | static void ubd_device_release(struct device *dev) |
| 812 | { |
Greg Kroah-Hartman | 8691b97 | 2009-05-04 12:40:54 -0700 | [diff] [blame] | 813 | struct ubd *ubd_dev = dev_get_drvdata(dev); |
Jeff Dike | 2e3f525 | 2007-05-06 14:51:29 -0700 | [diff] [blame] | 814 | |
| 815 | blk_cleanup_queue(ubd_dev->queue); |
| 816 | *ubd_dev = ((struct ubd) DEFAULT_UBD); |
| 817 | } |
| 818 | |
Paolo 'Blaisorblade' Giarrusso | 5f75a4f | 2006-10-30 22:07:06 -0800 | [diff] [blame] | 819 | static int ubd_disk_register(int major, u64 size, int unit, |
Jeff Dike | b8831a1 | 2007-02-10 01:44:17 -0800 | [diff] [blame] | 820 | struct gendisk **disk_out) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 821 | { |
| 822 | struct gendisk *disk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 823 | |
| 824 | disk = alloc_disk(1 << UBD_SHIFT); |
| 825 | if(disk == NULL) |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 826 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 827 | |
| 828 | disk->major = major; |
| 829 | disk->first_minor = unit << UBD_SHIFT; |
| 830 | disk->fops = &ubd_blops; |
| 831 | set_capacity(disk, size / 512); |
Christoph Hellwig | 792dd4f | 2009-03-31 15:23:39 -0700 | [diff] [blame] | 832 | if (major == UBD_MAJOR) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 833 | sprintf(disk->disk_name, "ubd%c", 'a' + unit); |
Greg Kroah-Hartman | ce7b0f4 | 2005-06-20 21:15:16 -0700 | [diff] [blame] | 834 | else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 835 | sprintf(disk->disk_name, "ubd_fake%d", unit); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 836 | |
| 837 | /* sysfs register (not for ide fake devices) */ |
Christoph Hellwig | 792dd4f | 2009-03-31 15:23:39 -0700 | [diff] [blame] | 838 | if (major == UBD_MAJOR) { |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 839 | ubd_devs[unit].pdev.id = unit; |
| 840 | ubd_devs[unit].pdev.name = DRIVER_NAME; |
Jeff Dike | 2e3f525 | 2007-05-06 14:51:29 -0700 | [diff] [blame] | 841 | ubd_devs[unit].pdev.dev.release = ubd_device_release; |
Greg Kroah-Hartman | 8691b97 | 2009-05-04 12:40:54 -0700 | [diff] [blame] | 842 | dev_set_drvdata(&ubd_devs[unit].pdev.dev, &ubd_devs[unit]); |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 843 | platform_device_register(&ubd_devs[unit].pdev); |
| 844 | disk->driverfs_dev = &ubd_devs[unit].pdev.dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 845 | } |
| 846 | |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 847 | disk->private_data = &ubd_devs[unit]; |
Jeff Dike | 62f96cb | 2007-02-10 01:44:16 -0800 | [diff] [blame] | 848 | disk->queue = ubd_devs[unit].queue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 849 | add_disk(disk); |
| 850 | |
| 851 | *disk_out = disk; |
| 852 | return 0; |
| 853 | } |
| 854 | |
| 855 | #define ROUND_BLOCK(n) ((n + ((1 << 9) - 1)) & (-1 << 9)) |
| 856 | |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 857 | static int ubd_add(int n, char **error_out) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 858 | { |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 859 | struct ubd *ubd_dev = &ubd_devs[n]; |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 860 | int err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 861 | |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 862 | if(ubd_dev->file == NULL) |
Jeff Dike | ec7cf78 | 2005-09-03 15:57:29 -0700 | [diff] [blame] | 863 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 864 | |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 865 | err = ubd_file_size(ubd_dev, &ubd_dev->size); |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 866 | if(err < 0){ |
| 867 | *error_out = "Couldn't determine size of device's file"; |
Jeff Dike | 80c1374 | 2006-09-29 01:58:51 -0700 | [diff] [blame] | 868 | goto out; |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 869 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 870 | |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 871 | ubd_dev->size = ROUND_BLOCK(ubd_dev->size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 872 | |
Jeff Dike | a0044bd | 2007-05-06 14:51:36 -0700 | [diff] [blame] | 873 | INIT_LIST_HEAD(&ubd_dev->restart); |
WANG Cong | 4f40c05 | 2007-11-05 14:50:59 -0800 | [diff] [blame] | 874 | sg_init_table(ubd_dev->sg, MAX_SG); |
Jeff Dike | a0044bd | 2007-05-06 14:51:36 -0700 | [diff] [blame] | 875 | |
Jeff Dike | 62f96cb | 2007-02-10 01:44:16 -0800 | [diff] [blame] | 876 | err = -ENOMEM; |
| 877 | ubd_dev->queue = blk_init_queue(do_ubd_request, &ubd_dev->lock); |
| 878 | if (ubd_dev->queue == NULL) { |
| 879 | *error_out = "Failed to initialize device queue"; |
Jeff Dike | 80c1374 | 2006-09-29 01:58:51 -0700 | [diff] [blame] | 880 | goto out; |
Jeff Dike | 62f96cb | 2007-02-10 01:44:16 -0800 | [diff] [blame] | 881 | } |
| 882 | ubd_dev->queue->queuedata = ubd_dev; |
| 883 | |
Martin K. Petersen | 8a78362 | 2010-02-26 00:20:39 -0500 | [diff] [blame] | 884 | blk_queue_max_segments(ubd_dev->queue, MAX_SG); |
Christoph Hellwig | 792dd4f | 2009-03-31 15:23:39 -0700 | [diff] [blame] | 885 | err = ubd_disk_register(UBD_MAJOR, ubd_dev->size, n, &ubd_gendisk[n]); |
Jeff Dike | 62f96cb | 2007-02-10 01:44:16 -0800 | [diff] [blame] | 886 | if(err){ |
| 887 | *error_out = "Failed to register device"; |
| 888 | goto out_cleanup; |
| 889 | } |
Jeff Dike | 6c29256c | 2006-03-27 01:14:37 -0800 | [diff] [blame] | 890 | |
Christoph Hellwig | 792dd4f | 2009-03-31 15:23:39 -0700 | [diff] [blame] | 891 | if (fake_major != UBD_MAJOR) |
Paolo 'Blaisorblade' Giarrusso | 5f75a4f | 2006-10-30 22:07:06 -0800 | [diff] [blame] | 892 | ubd_disk_register(fake_major, ubd_dev->size, n, |
Jeff Dike | 62f96cb | 2007-02-10 01:44:16 -0800 | [diff] [blame] | 893 | &fake_gendisk[n]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 894 | |
Jeff Dike | 83380cc | 2008-02-04 22:31:18 -0800 | [diff] [blame] | 895 | /* |
| 896 | * Perhaps this should also be under the "if (fake_major)" above |
| 897 | * using the fake_disk->disk_name |
| 898 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 899 | if (fake_ide) |
| 900 | make_ide_entries(ubd_gendisk[n]->disk_name); |
| 901 | |
Jeff Dike | ec7cf78 | 2005-09-03 15:57:29 -0700 | [diff] [blame] | 902 | err = 0; |
Jeff Dike | ec7cf78 | 2005-09-03 15:57:29 -0700 | [diff] [blame] | 903 | out: |
| 904 | return err; |
Jeff Dike | 62f96cb | 2007-02-10 01:44:16 -0800 | [diff] [blame] | 905 | |
| 906 | out_cleanup: |
| 907 | blk_cleanup_queue(ubd_dev->queue); |
| 908 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 909 | } |
| 910 | |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 911 | static int ubd_config(char *str, char **error_out) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 912 | { |
Paolo 'Blaisorblade' Giarrusso | e7f6552 | 2006-10-30 22:07:09 -0800 | [diff] [blame] | 913 | int n, ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 914 | |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 915 | /* This string is possibly broken up and stored, so it's only |
| 916 | * freed if ubd_setup_common fails, or if only general options |
| 917 | * were set. |
| 918 | */ |
Jeff Dike | 970d6e3 | 2006-01-06 00:18:48 -0800 | [diff] [blame] | 919 | str = kstrdup(str, GFP_KERNEL); |
Paolo 'Blaisorblade' Giarrusso | e7f6552 | 2006-10-30 22:07:09 -0800 | [diff] [blame] | 920 | if (str == NULL) { |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 921 | *error_out = "Failed to allocate memory"; |
| 922 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 923 | } |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 924 | |
| 925 | ret = ubd_setup_common(str, &n, error_out); |
| 926 | if (ret) |
Paolo 'Blaisorblade' Giarrusso | e7f6552 | 2006-10-30 22:07:09 -0800 | [diff] [blame] | 927 | goto err_free; |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 928 | |
Paolo 'Blaisorblade' Giarrusso | e7f6552 | 2006-10-30 22:07:09 -0800 | [diff] [blame] | 929 | if (n == -1) { |
| 930 | ret = 0; |
Paolo 'Blaisorblade' Giarrusso | d8d7c28 | 2006-10-30 22:07:12 -0800 | [diff] [blame] | 931 | goto err_free; |
Paolo 'Blaisorblade' Giarrusso | e7f6552 | 2006-10-30 22:07:09 -0800 | [diff] [blame] | 932 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 933 | |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 934 | mutex_lock(&ubd_lock); |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 935 | ret = ubd_add(n, error_out); |
Paolo 'Blaisorblade' Giarrusso | e7f6552 | 2006-10-30 22:07:09 -0800 | [diff] [blame] | 936 | if (ret) |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 937 | ubd_devs[n].file = NULL; |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 938 | mutex_unlock(&ubd_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 939 | |
Paolo 'Blaisorblade' Giarrusso | e7f6552 | 2006-10-30 22:07:09 -0800 | [diff] [blame] | 940 | out: |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 941 | return ret; |
Paolo 'Blaisorblade' Giarrusso | e7f6552 | 2006-10-30 22:07:09 -0800 | [diff] [blame] | 942 | |
| 943 | err_free: |
| 944 | kfree(str); |
| 945 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 946 | } |
| 947 | |
| 948 | static int ubd_get_config(char *name, char *str, int size, char **error_out) |
| 949 | { |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 950 | struct ubd *ubd_dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 951 | int n, len = 0; |
| 952 | |
| 953 | n = parse_unit(&name); |
| 954 | if((n >= MAX_DEV) || (n < 0)){ |
| 955 | *error_out = "ubd_get_config : device number out of range"; |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 956 | return -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 957 | } |
| 958 | |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 959 | ubd_dev = &ubd_devs[n]; |
Paolo 'Blaisorblade' Giarrusso | d7fb2c3 | 2006-10-30 22:07:07 -0800 | [diff] [blame] | 960 | mutex_lock(&ubd_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 961 | |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 962 | if(ubd_dev->file == NULL){ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 963 | CONFIG_CHUNK(str, size, len, "", 1); |
| 964 | goto out; |
| 965 | } |
| 966 | |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 967 | CONFIG_CHUNK(str, size, len, ubd_dev->file, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 968 | |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 969 | if(ubd_dev->cow.file != NULL){ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 970 | CONFIG_CHUNK(str, size, len, ",", 0); |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 971 | CONFIG_CHUNK(str, size, len, ubd_dev->cow.file, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 972 | } |
| 973 | else CONFIG_CHUNK(str, size, len, "", 1); |
| 974 | |
| 975 | out: |
Paolo 'Blaisorblade' Giarrusso | d7fb2c3 | 2006-10-30 22:07:07 -0800 | [diff] [blame] | 976 | mutex_unlock(&ubd_lock); |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 977 | return len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 978 | } |
| 979 | |
Jeff Dike | 29d56cf | 2005-06-25 14:55:25 -0700 | [diff] [blame] | 980 | static int ubd_id(char **str, int *start_out, int *end_out) |
| 981 | { |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 982 | int n; |
Jeff Dike | 29d56cf | 2005-06-25 14:55:25 -0700 | [diff] [blame] | 983 | |
| 984 | n = parse_unit(str); |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 985 | *start_out = 0; |
| 986 | *end_out = MAX_DEV - 1; |
| 987 | return n; |
Jeff Dike | 29d56cf | 2005-06-25 14:55:25 -0700 | [diff] [blame] | 988 | } |
| 989 | |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 990 | static int ubd_remove(int n, char **error_out) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 991 | { |
Jeff Dike | 2e3f525 | 2007-05-06 14:51:29 -0700 | [diff] [blame] | 992 | struct gendisk *disk = ubd_gendisk[n]; |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 993 | struct ubd *ubd_dev; |
Jeff Dike | 29d56cf | 2005-06-25 14:55:25 -0700 | [diff] [blame] | 994 | int err = -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 995 | |
Paolo 'Blaisorblade' Giarrusso | d7fb2c3 | 2006-10-30 22:07:07 -0800 | [diff] [blame] | 996 | mutex_lock(&ubd_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 997 | |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 998 | ubd_dev = &ubd_devs[n]; |
Jeff Dike | 29d56cf | 2005-06-25 14:55:25 -0700 | [diff] [blame] | 999 | |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 1000 | if(ubd_dev->file == NULL) |
Jeff Dike | 29d56cf | 2005-06-25 14:55:25 -0700 | [diff] [blame] | 1001 | goto out; |
| 1002 | |
| 1003 | /* you cannot remove a open disk */ |
| 1004 | err = -EBUSY; |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 1005 | if(ubd_dev->count > 0) |
Jeff Dike | 29d56cf | 2005-06-25 14:55:25 -0700 | [diff] [blame] | 1006 | goto out; |
| 1007 | |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 1008 | ubd_gendisk[n] = NULL; |
Jeff Dike | b47d2de | 2007-05-06 14:51:01 -0700 | [diff] [blame] | 1009 | if(disk != NULL){ |
| 1010 | del_gendisk(disk); |
| 1011 | put_disk(disk); |
| 1012 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1013 | |
| 1014 | if(fake_gendisk[n] != NULL){ |
| 1015 | del_gendisk(fake_gendisk[n]); |
| 1016 | put_disk(fake_gendisk[n]); |
| 1017 | fake_gendisk[n] = NULL; |
| 1018 | } |
| 1019 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1020 | err = 0; |
Jeff Dike | 2e3f525 | 2007-05-06 14:51:29 -0700 | [diff] [blame] | 1021 | platform_device_unregister(&ubd_dev->pdev); |
Jeff Dike | 29d56cf | 2005-06-25 14:55:25 -0700 | [diff] [blame] | 1022 | out: |
Paolo 'Blaisorblade' Giarrusso | d7fb2c3 | 2006-10-30 22:07:07 -0800 | [diff] [blame] | 1023 | mutex_unlock(&ubd_lock); |
Jeff Dike | 29d56cf | 2005-06-25 14:55:25 -0700 | [diff] [blame] | 1024 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1025 | } |
| 1026 | |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 1027 | /* All these are called by mconsole in process context and without |
Jeff Dike | b8831a1 | 2007-02-10 01:44:17 -0800 | [diff] [blame] | 1028 | * ubd-specific locks. The structure itself is const except for .list. |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 1029 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1030 | static struct mc_device ubd_mc = { |
Jeff Dike | 84f48d4 | 2007-02-10 01:44:01 -0800 | [diff] [blame] | 1031 | .list = LIST_HEAD_INIT(ubd_mc.list), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1032 | .name = "ubd", |
| 1033 | .config = ubd_config, |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 1034 | .get_config = ubd_get_config, |
Jeff Dike | 29d56cf | 2005-06-25 14:55:25 -0700 | [diff] [blame] | 1035 | .id = ubd_id, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1036 | .remove = ubd_remove, |
| 1037 | }; |
| 1038 | |
Paolo 'Blaisorblade' Giarrusso | d8d7c28 | 2006-10-30 22:07:12 -0800 | [diff] [blame] | 1039 | static int __init ubd_mc_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1040 | { |
| 1041 | mconsole_register_dev(&ubd_mc); |
| 1042 | return 0; |
| 1043 | } |
| 1044 | |
| 1045 | __initcall(ubd_mc_init); |
| 1046 | |
Paolo 'Blaisorblade' Giarrusso | d8d7c28 | 2006-10-30 22:07:12 -0800 | [diff] [blame] | 1047 | static int __init ubd0_init(void) |
| 1048 | { |
| 1049 | struct ubd *ubd_dev = &ubd_devs[0]; |
| 1050 | |
Jeff Dike | b8831a1 | 2007-02-10 01:44:17 -0800 | [diff] [blame] | 1051 | mutex_lock(&ubd_lock); |
Paolo 'Blaisorblade' Giarrusso | d8d7c28 | 2006-10-30 22:07:12 -0800 | [diff] [blame] | 1052 | if(ubd_dev->file == NULL) |
| 1053 | ubd_dev->file = "root_fs"; |
Jeff Dike | b8831a1 | 2007-02-10 01:44:17 -0800 | [diff] [blame] | 1054 | mutex_unlock(&ubd_lock); |
| 1055 | |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 1056 | return 0; |
Paolo 'Blaisorblade' Giarrusso | d8d7c28 | 2006-10-30 22:07:12 -0800 | [diff] [blame] | 1057 | } |
| 1058 | |
| 1059 | __initcall(ubd0_init); |
| 1060 | |
Jeff Dike | b8831a1 | 2007-02-10 01:44:17 -0800 | [diff] [blame] | 1061 | /* Used in ubd_init, which is an initcall */ |
Russell King | 3ae5eae | 2005-11-09 22:32:44 +0000 | [diff] [blame] | 1062 | static struct platform_driver ubd_driver = { |
| 1063 | .driver = { |
| 1064 | .name = DRIVER_NAME, |
| 1065 | }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1066 | }; |
| 1067 | |
Paolo 'Blaisorblade' Giarrusso | d8d7c28 | 2006-10-30 22:07:12 -0800 | [diff] [blame] | 1068 | static int __init ubd_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1069 | { |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 1070 | char *error; |
| 1071 | int i, err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1072 | |
Christoph Hellwig | 792dd4f | 2009-03-31 15:23:39 -0700 | [diff] [blame] | 1073 | if (register_blkdev(UBD_MAJOR, "ubd")) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1074 | return -1; |
| 1075 | |
Christoph Hellwig | 792dd4f | 2009-03-31 15:23:39 -0700 | [diff] [blame] | 1076 | if (fake_major != UBD_MAJOR) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1077 | char name[sizeof("ubd_nnn\0")]; |
| 1078 | |
| 1079 | snprintf(name, sizeof(name), "ubd_%d", fake_major); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1080 | if (register_blkdev(fake_major, "ubd")) |
| 1081 | return -1; |
| 1082 | } |
Russell King | 3ae5eae | 2005-11-09 22:32:44 +0000 | [diff] [blame] | 1083 | platform_driver_register(&ubd_driver); |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 1084 | mutex_lock(&ubd_lock); |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 1085 | for (i = 0; i < MAX_DEV; i++){ |
| 1086 | err = ubd_add(i, &error); |
| 1087 | if(err) |
| 1088 | printk(KERN_ERR "Failed to initialize ubd device %d :" |
| 1089 | "%s\n", i, error); |
| 1090 | } |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 1091 | mutex_unlock(&ubd_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1092 | return 0; |
| 1093 | } |
| 1094 | |
| 1095 | late_initcall(ubd_init); |
| 1096 | |
Paolo 'Blaisorblade' Giarrusso | d8d7c28 | 2006-10-30 22:07:12 -0800 | [diff] [blame] | 1097 | static int __init ubd_driver_init(void){ |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1098 | unsigned long stack; |
| 1099 | int err; |
| 1100 | |
| 1101 | /* Set by CONFIG_BLK_DEV_UBD_SYNC or ubd=sync.*/ |
| 1102 | if(global_openflags.s){ |
| 1103 | printk(KERN_INFO "ubd: Synchronous mode\n"); |
| 1104 | /* Letting ubd=sync be like using ubd#s= instead of ubd#= is |
| 1105 | * enough. So use anyway the io thread. */ |
| 1106 | } |
| 1107 | stack = alloc_stack(0, 0); |
Jeff Dike | 6c29256c | 2006-03-27 01:14:37 -0800 | [diff] [blame] | 1108 | io_pid = start_io_thread(stack + PAGE_SIZE - sizeof(void *), |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1109 | &thread_fd); |
| 1110 | if(io_pid < 0){ |
Jeff Dike | 6c29256c | 2006-03-27 01:14:37 -0800 | [diff] [blame] | 1111 | printk(KERN_ERR |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1112 | "ubd : Failed to start I/O thread (errno = %d) - " |
| 1113 | "falling back to synchronous I/O\n", -io_pid); |
| 1114 | io_pid = -1; |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 1115 | return 0; |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1116 | } |
Jeff Dike | 6c29256c | 2006-03-27 01:14:37 -0800 | [diff] [blame] | 1117 | 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] | 1118 | IRQF_DISABLED, "ubd", ubd_devs); |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1119 | if(err != 0) |
| 1120 | printk(KERN_ERR "um_request_irq failed - errno = %d\n", -err); |
Jeff Dike | f4c57a7 | 2006-03-31 02:30:10 -0800 | [diff] [blame] | 1121 | return 0; |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1122 | } |
| 1123 | |
| 1124 | device_initcall(ubd_driver_init); |
| 1125 | |
Al Viro | a625c99 | 2008-03-02 09:16:26 -0500 | [diff] [blame] | 1126 | static int ubd_open(struct block_device *bdev, fmode_t mode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1127 | { |
Al Viro | a625c99 | 2008-03-02 09:16:26 -0500 | [diff] [blame] | 1128 | struct gendisk *disk = bdev->bd_disk; |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 1129 | struct ubd *ubd_dev = disk->private_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1130 | int err = 0; |
| 1131 | |
Arnd Bergmann | 9a181c5 | 2010-09-11 18:38:03 +0200 | [diff] [blame] | 1132 | mutex_lock(&ubd_mutex); |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 1133 | if(ubd_dev->count == 0){ |
| 1134 | err = ubd_open_dev(ubd_dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1135 | if(err){ |
| 1136 | printk(KERN_ERR "%s: Can't open \"%s\": errno = %d\n", |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 1137 | disk->disk_name, ubd_dev->file, -err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1138 | goto out; |
| 1139 | } |
| 1140 | } |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 1141 | ubd_dev->count++; |
| 1142 | set_disk_ro(disk, !ubd_dev->openflags.w); |
Paolo 'Blaisorblade' Giarrusso | 2c49be9 | 2005-05-01 08:58:57 -0700 | [diff] [blame] | 1143 | |
| 1144 | /* This should no more be needed. And it didn't work anyway to exclude |
| 1145 | * read-write remounting of filesystems.*/ |
Al Viro | a625c99 | 2008-03-02 09:16:26 -0500 | [diff] [blame] | 1146 | /*if((mode & FMODE_WRITE) && !ubd_dev->openflags.w){ |
Paolo 'Blaisorblade' Giarrusso | 5f75a4f | 2006-10-30 22:07:06 -0800 | [diff] [blame] | 1147 | if(--ubd_dev->count == 0) ubd_close_dev(ubd_dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1148 | err = -EROFS; |
Paolo 'Blaisorblade' Giarrusso | 2c49be9 | 2005-05-01 08:58:57 -0700 | [diff] [blame] | 1149 | }*/ |
Arnd Bergmann | 6e9624b | 2010-08-07 18:25:34 +0200 | [diff] [blame] | 1150 | out: |
Arnd Bergmann | 9a181c5 | 2010-09-11 18:38:03 +0200 | [diff] [blame] | 1151 | mutex_unlock(&ubd_mutex); |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 1152 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1153 | } |
| 1154 | |
Al Viro | a625c99 | 2008-03-02 09:16:26 -0500 | [diff] [blame] | 1155 | static int ubd_release(struct gendisk *disk, fmode_t mode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1156 | { |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 1157 | struct ubd *ubd_dev = disk->private_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1158 | |
Arnd Bergmann | 9a181c5 | 2010-09-11 18:38:03 +0200 | [diff] [blame] | 1159 | mutex_lock(&ubd_mutex); |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 1160 | if(--ubd_dev->count == 0) |
Paolo 'Blaisorblade' Giarrusso | 5f75a4f | 2006-10-30 22:07:06 -0800 | [diff] [blame] | 1161 | ubd_close_dev(ubd_dev); |
Arnd Bergmann | 9a181c5 | 2010-09-11 18:38:03 +0200 | [diff] [blame] | 1162 | mutex_unlock(&ubd_mutex); |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 1163 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1164 | } |
| 1165 | |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1166 | static void cowify_bitmap(__u64 io_offset, int length, unsigned long *cow_mask, |
| 1167 | __u64 *cow_offset, unsigned long *bitmap, |
| 1168 | __u64 bitmap_offset, unsigned long *bitmap_words, |
| 1169 | __u64 bitmap_len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1170 | { |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1171 | __u64 sector = io_offset >> 9; |
| 1172 | int i, update_bitmap = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1173 | |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1174 | for(i = 0; i < length >> 9; i++){ |
| 1175 | if(cow_mask != NULL) |
| 1176 | ubd_set_bit(i, (unsigned char *) cow_mask); |
| 1177 | if(ubd_test_bit(sector + i, (unsigned char *) bitmap)) |
| 1178 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1179 | |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1180 | update_bitmap = 1; |
| 1181 | ubd_set_bit(sector + i, (unsigned char *) bitmap); |
| 1182 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1183 | |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1184 | if(!update_bitmap) |
| 1185 | return; |
| 1186 | |
| 1187 | *cow_offset = sector / (sizeof(unsigned long) * 8); |
| 1188 | |
| 1189 | /* This takes care of the case where we're exactly at the end of the |
| 1190 | * device, and *cow_offset + 1 is off the end. So, just back it up |
| 1191 | * by one word. Thanks to Lynn Kerby for the fix and James McMechan |
| 1192 | * for the original diagnosis. |
| 1193 | */ |
Jiri Olsa | 6d07424 | 2008-05-12 14:01:56 -0700 | [diff] [blame] | 1194 | if (*cow_offset == (DIV_ROUND_UP(bitmap_len, |
| 1195 | sizeof(unsigned long)) - 1)) |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1196 | (*cow_offset)--; |
| 1197 | |
| 1198 | bitmap_words[0] = bitmap[*cow_offset]; |
| 1199 | bitmap_words[1] = bitmap[*cow_offset + 1]; |
| 1200 | |
| 1201 | *cow_offset *= sizeof(unsigned long); |
| 1202 | *cow_offset += bitmap_offset; |
| 1203 | } |
| 1204 | |
| 1205 | static void cowify_req(struct io_thread_req *req, unsigned long *bitmap, |
| 1206 | __u64 bitmap_offset, __u64 bitmap_len) |
| 1207 | { |
| 1208 | __u64 sector = req->offset >> 9; |
| 1209 | int i; |
| 1210 | |
| 1211 | if(req->length > (sizeof(req->sector_mask) * 8) << 9) |
| 1212 | panic("Operation too long"); |
| 1213 | |
| 1214 | if(req->op == UBD_READ) { |
| 1215 | for(i = 0; i < req->length >> 9; i++){ |
| 1216 | if(ubd_test_bit(sector + i, (unsigned char *) bitmap)) |
Jeff Dike | 6c29256c | 2006-03-27 01:14:37 -0800 | [diff] [blame] | 1217 | ubd_set_bit(i, (unsigned char *) |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1218 | &req->sector_mask); |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 1219 | } |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1220 | } |
| 1221 | else cowify_bitmap(req->offset, req->length, &req->sector_mask, |
| 1222 | &req->cow_offset, bitmap, bitmap_offset, |
| 1223 | req->bitmap_words, bitmap_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1224 | } |
| 1225 | |
Jeff Dike | 62f96cb | 2007-02-10 01:44:16 -0800 | [diff] [blame] | 1226 | /* Called with dev->lock held */ |
Jeff Dike | a0044bd | 2007-05-06 14:51:36 -0700 | [diff] [blame] | 1227 | static void prepare_request(struct request *req, struct io_thread_req *io_req, |
| 1228 | unsigned long long offset, int page_offset, |
| 1229 | int len, struct page *page) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1230 | { |
| 1231 | struct gendisk *disk = req->rq_disk; |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 1232 | struct ubd *ubd_dev = disk->private_data; |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1233 | |
Jeff Dike | 62f96cb | 2007-02-10 01:44:16 -0800 | [diff] [blame] | 1234 | io_req->req = req; |
Jeff Dike | a0044bd | 2007-05-06 14:51:36 -0700 | [diff] [blame] | 1235 | io_req->fds[0] = (ubd_dev->cow.file != NULL) ? ubd_dev->cow.fd : |
| 1236 | ubd_dev->fd; |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 1237 | io_req->fds[1] = ubd_dev->fd; |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1238 | io_req->cow_offset = -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1239 | io_req->offset = offset; |
| 1240 | io_req->length = len; |
| 1241 | io_req->error = 0; |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1242 | io_req->sector_mask = 0; |
| 1243 | |
| 1244 | io_req->op = (rq_data_dir(req) == READ) ? UBD_READ : UBD_WRITE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1245 | io_req->offsets[0] = 0; |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 1246 | io_req->offsets[1] = ubd_dev->cow.data_offset; |
Jeff Dike | a0044bd | 2007-05-06 14:51:36 -0700 | [diff] [blame] | 1247 | io_req->buffer = page_address(page) + page_offset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1248 | io_req->sectorsize = 1 << 9; |
| 1249 | |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 1250 | if(ubd_dev->cow.file != NULL) |
Jeff Dike | a0044bd | 2007-05-06 14:51:36 -0700 | [diff] [blame] | 1251 | cowify_req(io_req, ubd_dev->cow.bitmap, |
| 1252 | ubd_dev->cow.bitmap_offset, ubd_dev->cow.bitmap_len); |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1253 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1254 | } |
| 1255 | |
Jeff Dike | 62f96cb | 2007-02-10 01:44:16 -0800 | [diff] [blame] | 1256 | /* Called with dev->lock held */ |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 1257 | static void do_ubd_request(struct request_queue *q) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1258 | { |
Jeff Dike | 2adcec2 | 2007-05-06 14:51:37 -0700 | [diff] [blame] | 1259 | struct io_thread_req *io_req; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1260 | struct request *req; |
Tejun Heo | f81f2f7 | 2009-04-28 13:06:10 +0900 | [diff] [blame] | 1261 | int n; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1262 | |
Jeff Dike | a0044bd | 2007-05-06 14:51:36 -0700 | [diff] [blame] | 1263 | while(1){ |
Jeff Dike | 2a9529a | 2007-03-29 01:20:27 -0700 | [diff] [blame] | 1264 | struct ubd *dev = q->queuedata; |
Jeff Dike | a0044bd | 2007-05-06 14:51:36 -0700 | [diff] [blame] | 1265 | if(dev->end_sg == 0){ |
Tejun Heo | 9934c8c | 2009-05-08 11:54:16 +0900 | [diff] [blame] | 1266 | struct request *req = blk_fetch_request(q); |
Jeff Dike | a0044bd | 2007-05-06 14:51:36 -0700 | [diff] [blame] | 1267 | if(req == NULL) |
| 1268 | return; |
| 1269 | |
| 1270 | dev->request = req; |
Tejun Heo | 4752690 | 2010-10-15 12:56:21 +0200 | [diff] [blame] | 1271 | dev->rq_pos = blk_rq_pos(req); |
Jeff Dike | a0044bd | 2007-05-06 14:51:36 -0700 | [diff] [blame] | 1272 | dev->start_sg = 0; |
| 1273 | dev->end_sg = blk_rq_map_sg(q, req, dev->sg); |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1274 | } |
Jeff Dike | a0044bd | 2007-05-06 14:51:36 -0700 | [diff] [blame] | 1275 | |
| 1276 | req = dev->request; |
| 1277 | while(dev->start_sg < dev->end_sg){ |
| 1278 | struct scatterlist *sg = &dev->sg[dev->start_sg]; |
| 1279 | |
Jeff Dike | 2adcec2 | 2007-05-06 14:51:37 -0700 | [diff] [blame] | 1280 | io_req = kmalloc(sizeof(struct io_thread_req), |
Peter Zijlstra | 990c558 | 2007-05-06 14:51:38 -0700 | [diff] [blame] | 1281 | GFP_ATOMIC); |
Jeff Dike | 2adcec2 | 2007-05-06 14:51:37 -0700 | [diff] [blame] | 1282 | if(io_req == NULL){ |
| 1283 | if(list_empty(&dev->restart)) |
| 1284 | list_add(&dev->restart, &restart); |
| 1285 | return; |
| 1286 | } |
| 1287 | prepare_request(req, io_req, |
Tejun Heo | 4752690 | 2010-10-15 12:56:21 +0200 | [diff] [blame] | 1288 | (unsigned long long)dev->rq_pos << 9, |
Jens Axboe | 45711f1 | 2007-10-22 21:19:53 +0200 | [diff] [blame] | 1289 | sg->offset, sg->length, sg_page(sg)); |
Jeff Dike | a0044bd | 2007-05-06 14:51:36 -0700 | [diff] [blame] | 1290 | |
Jeff Dike | a6ea4cc | 2007-05-06 14:51:43 -0700 | [diff] [blame] | 1291 | n = os_write_file(thread_fd, &io_req, |
| 1292 | sizeof(struct io_thread_req *)); |
Jeff Dike | 2adcec2 | 2007-05-06 14:51:37 -0700 | [diff] [blame] | 1293 | if(n != sizeof(struct io_thread_req *)){ |
Jeff Dike | a0044bd | 2007-05-06 14:51:36 -0700 | [diff] [blame] | 1294 | if(n != -EAGAIN) |
| 1295 | printk("write to io thread failed, " |
| 1296 | "errno = %d\n", -n); |
| 1297 | else if(list_empty(&dev->restart)) |
| 1298 | list_add(&dev->restart, &restart); |
Miklos Szeredi | 12429bf | 2007-11-28 16:21:52 -0800 | [diff] [blame] | 1299 | kfree(io_req); |
Jeff Dike | a0044bd | 2007-05-06 14:51:36 -0700 | [diff] [blame] | 1300 | return; |
| 1301 | } |
| 1302 | |
Tejun Heo | 4752690 | 2010-10-15 12:56:21 +0200 | [diff] [blame] | 1303 | dev->rq_pos += sg->length >> 9; |
Jeff Dike | a0044bd | 2007-05-06 14:51:36 -0700 | [diff] [blame] | 1304 | dev->start_sg++; |
| 1305 | } |
| 1306 | dev->end_sg = 0; |
| 1307 | dev->request = NULL; |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1308 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1309 | } |
| 1310 | |
Christoph Hellwig | a885c8c | 2006-01-08 01:02:50 -0800 | [diff] [blame] | 1311 | static int ubd_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
| 1312 | { |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 1313 | struct ubd *ubd_dev = bdev->bd_disk->private_data; |
Christoph Hellwig | a885c8c | 2006-01-08 01:02:50 -0800 | [diff] [blame] | 1314 | |
| 1315 | geo->heads = 128; |
| 1316 | geo->sectors = 32; |
Paolo 'Blaisorblade' Giarrusso | 7d314e3 | 2006-10-30 22:07:05 -0800 | [diff] [blame] | 1317 | geo->cylinders = ubd_dev->size / (128 * 32 * 512); |
Christoph Hellwig | a885c8c | 2006-01-08 01:02:50 -0800 | [diff] [blame] | 1318 | return 0; |
| 1319 | } |
| 1320 | |
Al Viro | a625c99 | 2008-03-02 09:16:26 -0500 | [diff] [blame] | 1321 | static int ubd_ioctl(struct block_device *bdev, fmode_t mode, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1322 | unsigned int cmd, unsigned long arg) |
| 1323 | { |
Al Viro | a625c99 | 2008-03-02 09:16:26 -0500 | [diff] [blame] | 1324 | struct ubd *ubd_dev = bdev->bd_disk->private_data; |
Bartlomiej Zolnierkiewicz | 73855e1 | 2009-04-01 21:42:21 +0200 | [diff] [blame] | 1325 | u16 ubd_id[ATA_ID_WORDS]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1326 | |
| 1327 | switch (cmd) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1328 | struct cdrom_volctrl volume; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1329 | case HDIO_GET_IDENTITY: |
Bartlomiej Zolnierkiewicz | 73855e1 | 2009-04-01 21:42:21 +0200 | [diff] [blame] | 1330 | memset(&ubd_id, 0, ATA_ID_WORDS * 2); |
| 1331 | ubd_id[ATA_ID_CYLS] = ubd_dev->size / (128 * 32 * 512); |
| 1332 | ubd_id[ATA_ID_HEADS] = 128; |
| 1333 | ubd_id[ATA_ID_SECTORS] = 32; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1334 | if(copy_to_user((char __user *) arg, (char *) &ubd_id, |
| 1335 | sizeof(ubd_id))) |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 1336 | return -EFAULT; |
| 1337 | return 0; |
Jeff Dike | b8831a1 | 2007-02-10 01:44:17 -0800 | [diff] [blame] | 1338 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1339 | case CDROMVOLREAD: |
| 1340 | if(copy_from_user(&volume, (char __user *) arg, sizeof(volume))) |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 1341 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1342 | volume.channel0 = 255; |
| 1343 | volume.channel1 = 255; |
| 1344 | volume.channel2 = 255; |
| 1345 | volume.channel3 = 255; |
| 1346 | if(copy_to_user((char __user *) arg, &volume, sizeof(volume))) |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 1347 | return -EFAULT; |
| 1348 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1349 | } |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 1350 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1351 | } |
| 1352 | |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1353 | static int update_bitmap(struct io_thread_req *req) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1354 | { |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1355 | int n; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1356 | |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1357 | if(req->cow_offset == -1) |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 1358 | return 0; |
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 | n = os_seek_file(req->fds[1], req->cow_offset); |
| 1361 | if(n < 0){ |
| 1362 | printk("do_io - bitmap lseek failed : err = %d\n", -n); |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 1363 | return 1; |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1364 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1365 | |
Jeff Dike | a6ea4cc | 2007-05-06 14:51:43 -0700 | [diff] [blame] | 1366 | n = os_write_file(req->fds[1], &req->bitmap_words, |
| 1367 | sizeof(req->bitmap_words)); |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1368 | if(n != sizeof(req->bitmap_words)){ |
| 1369 | printk("do_io - bitmap update failed, err = %d fd = %d\n", -n, |
| 1370 | req->fds[1]); |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 1371 | return 1; |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1372 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1373 | |
Jeff Dike | dc764e5 | 2007-05-06 14:51:41 -0700 | [diff] [blame] | 1374 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1375 | } |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1376 | |
WANG Cong | 5dc62b1 | 2008-04-28 02:13:58 -0700 | [diff] [blame] | 1377 | static void do_io(struct io_thread_req *req) |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1378 | { |
| 1379 | char *buf; |
| 1380 | unsigned long len; |
| 1381 | int n, nsectors, start, end, bit; |
| 1382 | int err; |
| 1383 | __u64 off; |
| 1384 | |
| 1385 | nsectors = req->length / req->sectorsize; |
| 1386 | start = 0; |
| 1387 | do { |
| 1388 | bit = ubd_test_bit(start, (unsigned char *) &req->sector_mask); |
| 1389 | end = start; |
| 1390 | while((end < nsectors) && |
| 1391 | (ubd_test_bit(end, (unsigned char *) |
| 1392 | &req->sector_mask) == bit)) |
| 1393 | end++; |
| 1394 | |
| 1395 | off = req->offset + req->offsets[bit] + |
| 1396 | start * req->sectorsize; |
| 1397 | len = (end - start) * req->sectorsize; |
| 1398 | buf = &req->buffer[start * req->sectorsize]; |
| 1399 | |
| 1400 | err = os_seek_file(req->fds[bit], off); |
| 1401 | if(err < 0){ |
| 1402 | printk("do_io - lseek failed : err = %d\n", -err); |
| 1403 | req->error = 1; |
| 1404 | return; |
| 1405 | } |
| 1406 | if(req->op == UBD_READ){ |
| 1407 | n = 0; |
| 1408 | do { |
| 1409 | buf = &buf[n]; |
| 1410 | len -= n; |
Jeff Dike | a6ea4cc | 2007-05-06 14:51:43 -0700 | [diff] [blame] | 1411 | n = os_read_file(req->fds[bit], buf, len); |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1412 | if (n < 0) { |
| 1413 | printk("do_io - read failed, err = %d " |
| 1414 | "fd = %d\n", -n, req->fds[bit]); |
| 1415 | req->error = 1; |
| 1416 | return; |
| 1417 | } |
| 1418 | } while((n < len) && (n != 0)); |
| 1419 | if (n < len) memset(&buf[n], 0, len - n); |
| 1420 | } else { |
Jeff Dike | a6ea4cc | 2007-05-06 14:51:43 -0700 | [diff] [blame] | 1421 | n = os_write_file(req->fds[bit], buf, len); |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1422 | if(n != len){ |
| 1423 | printk("do_io - write failed err = %d " |
| 1424 | "fd = %d\n", -n, req->fds[bit]); |
| 1425 | req->error = 1; |
| 1426 | return; |
| 1427 | } |
| 1428 | } |
| 1429 | |
| 1430 | start = end; |
| 1431 | } while(start < nsectors); |
| 1432 | |
| 1433 | req->error = update_bitmap(req); |
| 1434 | } |
| 1435 | |
| 1436 | /* Changed in start_io_thread, which is serialized by being called only |
| 1437 | * from ubd_init, which is an initcall. |
| 1438 | */ |
| 1439 | int kernel_fd = -1; |
| 1440 | |
Paolo 'Blaisorblade' Giarrusso | d8d7c28 | 2006-10-30 22:07:12 -0800 | [diff] [blame] | 1441 | /* Only changed by the io thread. XXX: currently unused. */ |
| 1442 | static int io_count = 0; |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1443 | |
| 1444 | int io_thread(void *arg) |
| 1445 | { |
Jeff Dike | 2adcec2 | 2007-05-06 14:51:37 -0700 | [diff] [blame] | 1446 | struct io_thread_req *req; |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1447 | int n; |
| 1448 | |
| 1449 | ignore_sigwinch_sig(); |
| 1450 | while(1){ |
Jeff Dike | a6ea4cc | 2007-05-06 14:51:43 -0700 | [diff] [blame] | 1451 | n = os_read_file(kernel_fd, &req, |
Jeff Dike | 2adcec2 | 2007-05-06 14:51:37 -0700 | [diff] [blame] | 1452 | sizeof(struct io_thread_req *)); |
| 1453 | if(n != sizeof(struct io_thread_req *)){ |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1454 | if(n < 0) |
| 1455 | printk("io_thread - read failed, fd = %d, " |
| 1456 | "err = %d\n", kernel_fd, -n); |
| 1457 | else { |
| 1458 | printk("io_thread - short read, fd = %d, " |
| 1459 | "length = %d\n", kernel_fd, n); |
| 1460 | } |
| 1461 | continue; |
| 1462 | } |
| 1463 | io_count++; |
Jeff Dike | 2adcec2 | 2007-05-06 14:51:37 -0700 | [diff] [blame] | 1464 | do_io(req); |
Jeff Dike | a6ea4cc | 2007-05-06 14:51:43 -0700 | [diff] [blame] | 1465 | n = os_write_file(kernel_fd, &req, |
Jeff Dike | 2adcec2 | 2007-05-06 14:51:37 -0700 | [diff] [blame] | 1466 | sizeof(struct io_thread_req *)); |
| 1467 | if(n != sizeof(struct io_thread_req *)) |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1468 | printk("io_thread - write failed, fd = %d, err = %d\n", |
| 1469 | kernel_fd, -n); |
| 1470 | } |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 1471 | |
Jeff Dike | 1b57e9c | 2006-01-06 00:18:49 -0800 | [diff] [blame] | 1472 | return 0; |
| 1473 | } |