* James McMechan
*/
-#define MAJOR_NR UBD_MAJOR
#define UBD_SHIFT 4
#include "linux/kernel.h"
#include "linux/module.h"
#include "linux/blkdev.h"
+#include "linux/ata.h"
#include "linux/hdreg.h"
#include "linux/init.h"
#include "linux/cdrom.h"
#include "linux/proc_fs.h"
+#include "linux/seq_file.h"
#include "linux/ctype.h"
#include "linux/capability.h"
#include "linux/mm.h"
#include "linux/genhd.h"
#include "linux/spinlock.h"
#include "linux/platform_device.h"
+#include "linux/scatterlist.h"
#include "asm/segment.h"
#include "asm/uaccess.h"
#include "asm/irq.h"
int error;
};
-extern int open_ubd_file(char *file, struct openflags *openflags, int shared,
- char **backing_file_out, int *bitmap_offset_out,
- unsigned long *bitmap_len_out, int *data_offset_out,
- int *create_cow_out);
-extern int create_cow_file(char *cow_file, char *backing_file,
- struct openflags flags, int sectorsize,
- int alignment, int *bitmap_offset_out,
- unsigned long *bitmap_len_out,
- int *data_offset_out);
-extern int read_cow_bitmap(int fd, void *buf, int offset, int len);
-extern void do_io(struct io_thread_req *req);
-
static inline int ubd_test_bit(__u64 bit, unsigned char *data)
{
__u64 n;
static DEFINE_MUTEX(ubd_lock);
-static int ubd_open(struct inode * inode, struct file * filp);
-static int ubd_release(struct inode * inode, struct file * file);
-static int ubd_ioctl(struct inode * inode, struct file * file,
+static int ubd_open(struct block_device *bdev, fmode_t mode);
+static int ubd_release(struct gendisk *disk, fmode_t mode);
+static int ubd_ioctl(struct block_device *bdev, fmode_t mode,
unsigned int cmd, unsigned long arg);
static int ubd_getgeo(struct block_device *bdev, struct hd_geometry *geo);
#define MAX_DEV (16)
-static struct block_device_operations ubd_blops = {
+static const struct block_device_operations ubd_blops = {
.owner = THIS_MODULE,
.open = ubd_open,
.release = ubd_release,
};
/* Protected by ubd_lock */
-static int fake_major = MAJOR_NR;
+static int fake_major = UBD_MAJOR;
static struct gendisk *ubd_gendisk[MAX_DEV];
static struct gendisk *fake_gendisk[MAX_DEV];
}
/* Protected by ubd_lock */
-struct ubd ubd_devs[MAX_DEV] = { [ 0 ... MAX_DEV - 1 ] = DEFAULT_UBD };
+static struct ubd ubd_devs[MAX_DEV] = { [0 ... MAX_DEV - 1] = DEFAULT_UBD };
/* Only changed by fake_ide_setup which is a setup */
static int fake_ide = 0;
proc_ide = proc_mkdir("ide0", proc_ide_root);
}
-static int proc_ide_read_media(char *page, char **start, off_t off, int count,
- int *eof, void *data)
+static int fake_ide_media_proc_show(struct seq_file *m, void *v)
{
- int len;
-
- strcpy(page, "disk\n");
- len = strlen("disk\n");
- len -= off;
- if (len < count){
- *eof = 1;
- if (len <= 0) return 0;
- }
- else len = count;
- *start = page + off;
- return len;
+ seq_puts(m, "disk\n");
+ return 0;
+}
+
+static int fake_ide_media_proc_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, fake_ide_media_proc_show, NULL);
}
-static void make_ide_entries(char *dev_name)
+static const struct file_operations fake_ide_media_proc_fops = {
+ .owner = THIS_MODULE,
+ .open = fake_ide_media_proc_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+static void make_ide_entries(const char *dev_name)
{
struct proc_dir_entry *dir, *ent;
char name[64];
dir = proc_mkdir(dev_name, proc_ide);
if(!dir) return;
- ent = create_proc_entry("media", S_IFREG|S_IRUGO, dir);
+ ent = proc_create("media", S_IRUGO, dir, &fake_ide_media_proc_fops);
if(!ent) return;
- ent->data = NULL;
- ent->read_proc = proc_ide_read_media;
- ent->write_proc = NULL;
- sprintf(name,"ide0/%s", dev_name);
+ snprintf(name, sizeof(name), "ide0/%s", dev_name);
proc_symlink(dev_name, proc_ide_root, name);
}
}
mutex_lock(&ubd_lock);
- if(fake_major != MAJOR_NR){
+ if (fake_major != UBD_MAJOR) {
*error_out = "Can't assign a fake major twice";
goto out1;
}
" machine by running 'dd' on the device. <n> must be in the range\n"
" 0 to 7. Appending an 'r' to the number will cause that device\n"
" to be mounted read-only. For example ubd1r=./ext_fs. Appending\n"
-" an 's' will cause data to be written to disk on the host immediately.\n\n"
+" an 's' will cause data to be written to disk on the host immediately.\n"
+" 'c' will cause the device to be treated as being shared between multiple\n"
+" UMLs and file locking will be turned off - this is appropriate for a\n"
+" cluster filesystem and inappropriate at almost all other times.\n\n"
);
static int udb_setup(char *str)
" in the boot output.\n\n"
);
-static int fakehd_set = 0;
-static int fakehd(char *str)
-{
- printk(KERN_INFO "fakehd : Changing ubd name to \"hd\".\n");
- fakehd_set = 1;
- return 1;
-}
-
-__setup("fakehd", fakehd);
-__uml_help(fakehd,
-"fakehd\n"
-" Change the ubd device name to \"hd\".\n\n"
-);
-
-static void do_ubd_request(request_queue_t * q);
+static void do_ubd_request(struct request_queue * q);
/* Only changed by ubd_init, which is an initcall. */
-int thread_fd = -1;
-
-static void ubd_end_request(struct request *req, int bytes, int uptodate)
-{
- if (!end_that_request_first(req, uptodate, bytes >> 9)) {
- struct ubd *dev = req->rq_disk->private_data;
- unsigned long flags;
-
- add_disk_randomness(req->rq_disk);
- spin_lock_irqsave(&dev->lock, flags);
- end_that_request_last(req, uptodate);
- spin_unlock_irqrestore(&dev->lock, flags);
- }
-}
-
-/* Callable only from interrupt context - otherwise you need to do
- * spin_lock_irq()/spin_lock_irqsave() */
-static inline void ubd_finish(struct request *req, int bytes)
-{
- if(bytes < 0){
- ubd_end_request(req, 0, 0);
- return;
- }
- ubd_end_request(req, bytes, 1);
-}
-
+static int thread_fd = -1;
static LIST_HEAD(restart);
/* XXX - move this inside ubd_intr. */
static void ubd_handler(void)
{
struct io_thread_req *req;
- struct request *rq;
struct ubd *ubd;
struct list_head *list, *next_ele;
unsigned long flags;
return;
}
- rq = req->req;
- rq->nr_sectors -= req->length >> 9;
- if(rq->nr_sectors == 0)
- ubd_finish(rq, rq->hard_nr_sectors << 9);
+ blk_end_request(req->req, 0, req->length);
kfree(req);
}
reactivate_fd(thread_fd, UBD_IRQ);
/* Only changed by ubd_init, which is an initcall. */
static int io_pid = -1;
-void kill_io_thread(void)
+static void kill_io_thread(void)
{
if(io_pid != -1)
os_kill_process(io_pid, 1);
return os_file_size(file, size_out);
}
+static int read_cow_bitmap(int fd, void *buf, int offset, int len)
+{
+ int err;
+
+ err = os_seek_file(fd, offset);
+ if (err < 0)
+ return err;
+
+ err = os_read_file(fd, buf, len);
+ if (err < 0)
+ return err;
+
+ return 0;
+}
+
+static int backing_file_mismatch(char *file, __u64 size, time_t mtime)
+{
+ unsigned long modtime;
+ unsigned long long actual;
+ int err;
+
+ err = os_file_modtime(file, &modtime);
+ if (err < 0) {
+ printk(KERN_ERR "Failed to get modification time of backing "
+ "file \"%s\", err = %d\n", file, -err);
+ return err;
+ }
+
+ err = os_file_size(file, &actual);
+ if (err < 0) {
+ printk(KERN_ERR "Failed to get size of backing file \"%s\", "
+ "err = %d\n", file, -err);
+ return err;
+ }
+
+ if (actual != size) {
+ /*__u64 can be a long on AMD64 and with %lu GCC complains; so
+ * the typecast.*/
+ printk(KERN_ERR "Size mismatch (%llu vs %llu) of COW header "
+ "vs backing file\n", (unsigned long long) size, actual);
+ return -EINVAL;
+ }
+ if (modtime != mtime) {
+ printk(KERN_ERR "mtime mismatch (%ld vs %ld) of COW header vs "
+ "backing file\n", mtime, modtime);
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static int path_requires_switch(char *from_cmdline, char *from_cow, char *cow)
+{
+ struct uml_stat buf1, buf2;
+ int err;
+
+ if (from_cmdline == NULL)
+ return 0;
+ if (!strcmp(from_cmdline, from_cow))
+ return 0;
+
+ err = os_stat_file(from_cmdline, &buf1);
+ if (err < 0) {
+ printk(KERN_ERR "Couldn't stat '%s', err = %d\n", from_cmdline,
+ -err);
+ return 0;
+ }
+ err = os_stat_file(from_cow, &buf2);
+ if (err < 0) {
+ printk(KERN_ERR "Couldn't stat '%s', err = %d\n", from_cow,
+ -err);
+ return 1;
+ }
+ if ((buf1.ust_dev == buf2.ust_dev) && (buf1.ust_ino == buf2.ust_ino))
+ return 0;
+
+ printk(KERN_ERR "Backing file mismatch - \"%s\" requested, "
+ "\"%s\" specified in COW header of \"%s\"\n",
+ from_cmdline, from_cow, cow);
+ return 1;
+}
+
+static int open_ubd_file(char *file, struct openflags *openflags, int shared,
+ char **backing_file_out, int *bitmap_offset_out,
+ unsigned long *bitmap_len_out, int *data_offset_out,
+ int *create_cow_out)
+{
+ time_t mtime;
+ unsigned long long size;
+ __u32 version, align;
+ char *backing_file;
+ int fd, err, sectorsize, asked_switch, mode = 0644;
+
+ fd = os_open_file(file, *openflags, mode);
+ if (fd < 0) {
+ if ((fd == -ENOENT) && (create_cow_out != NULL))
+ *create_cow_out = 1;
+ if (!openflags->w ||
+ ((fd != -EROFS) && (fd != -EACCES)))
+ return fd;
+ openflags->w = 0;
+ fd = os_open_file(file, *openflags, mode);
+ if (fd < 0)
+ return fd;
+ }
+
+ if (shared)
+ printk(KERN_INFO "Not locking \"%s\" on the host\n", file);
+ else {
+ err = os_lock_file(fd, openflags->w);
+ if (err < 0) {
+ printk(KERN_ERR "Failed to lock '%s', err = %d\n",
+ file, -err);
+ goto out_close;
+ }
+ }
+
+ /* Successful return case! */
+ if (backing_file_out == NULL)
+ return fd;
+
+ err = read_cow_header(file_reader, &fd, &version, &backing_file, &mtime,
+ &size, §orsize, &align, bitmap_offset_out);
+ if (err && (*backing_file_out != NULL)) {
+ printk(KERN_ERR "Failed to read COW header from COW file "
+ "\"%s\", errno = %d\n", file, -err);
+ goto out_close;
+ }
+ if (err)
+ return fd;
+
+ asked_switch = path_requires_switch(*backing_file_out, backing_file,
+ file);
+
+ /* Allow switching only if no mismatch. */
+ if (asked_switch && !backing_file_mismatch(*backing_file_out, size,
+ mtime)) {
+ printk(KERN_ERR "Switching backing file to '%s'\n",
+ *backing_file_out);
+ err = write_cow_header(file, fd, *backing_file_out,
+ sectorsize, align, &size);
+ if (err) {
+ printk(KERN_ERR "Switch failed, errno = %d\n", -err);
+ goto out_close;
+ }
+ } else {
+ *backing_file_out = backing_file;
+ err = backing_file_mismatch(*backing_file_out, size, mtime);
+ if (err)
+ goto out_close;
+ }
+
+ cow_sizes(version, size, sectorsize, align, *bitmap_offset_out,
+ bitmap_len_out, data_offset_out);
+
+ return fd;
+ out_close:
+ os_close_file(fd);
+ return err;
+}
+
+static int create_cow_file(char *cow_file, char *backing_file,
+ struct openflags flags,
+ int sectorsize, int alignment, int *bitmap_offset_out,
+ unsigned long *bitmap_len_out, int *data_offset_out)
+{
+ int err, fd;
+
+ flags.c = 1;
+ fd = open_ubd_file(cow_file, &flags, 0, NULL, NULL, NULL, NULL, NULL);
+ if (fd < 0) {
+ err = fd;
+ printk(KERN_ERR "Open of COW file '%s' failed, errno = %d\n",
+ cow_file, -err);
+ goto out;
+ }
+
+ err = init_cow_file(fd, cow_file, backing_file, sectorsize, alignment,
+ bitmap_offset_out, bitmap_len_out,
+ data_offset_out);
+ if (!err)
+ return fd;
+ os_close_file(fd);
+ out:
+ return err;
+}
+
static void ubd_close_dev(struct ubd *ubd_dev)
{
os_close_file(ubd_dev->fd);
ubd_dev->fd = fd;
if(ubd_dev->cow.file != NULL){
+ blk_queue_max_sectors(ubd_dev->queue, 8 * sizeof(long));
+
err = -ENOMEM;
- ubd_dev->cow.bitmap = (void *) vmalloc(ubd_dev->cow.bitmap_len);
+ ubd_dev->cow.bitmap = vmalloc(ubd_dev->cow.bitmap_len);
if(ubd_dev->cow.bitmap == NULL){
printk(KERN_ERR "Failed to vmalloc COW bitmap\n");
goto error;
static void ubd_device_release(struct device *dev)
{
- struct ubd *ubd_dev = dev->driver_data;
+ struct ubd *ubd_dev = dev_get_drvdata(dev);
blk_cleanup_queue(ubd_dev->queue);
*ubd_dev = ((struct ubd) DEFAULT_UBD);
disk->first_minor = unit << UBD_SHIFT;
disk->fops = &ubd_blops;
set_capacity(disk, size / 512);
- if(major == MAJOR_NR)
+ if (major == UBD_MAJOR)
sprintf(disk->disk_name, "ubd%c", 'a' + unit);
else
sprintf(disk->disk_name, "ubd_fake%d", unit);
/* sysfs register (not for ide fake devices) */
- if (major == MAJOR_NR) {
+ if (major == UBD_MAJOR) {
ubd_devs[unit].pdev.id = unit;
ubd_devs[unit].pdev.name = DRIVER_NAME;
ubd_devs[unit].pdev.dev.release = ubd_device_release;
- ubd_devs[unit].pdev.dev.driver_data = &ubd_devs[unit];
+ dev_set_drvdata(&ubd_devs[unit].pdev.dev, &ubd_devs[unit]);
platform_device_register(&ubd_devs[unit].pdev);
disk->driverfs_dev = &ubd_devs[unit].pdev.dev;
}
ubd_dev->size = ROUND_BLOCK(ubd_dev->size);
INIT_LIST_HEAD(&ubd_dev->restart);
+ sg_init_table(ubd_dev->sg, MAX_SG);
err = -ENOMEM;
ubd_dev->queue = blk_init_queue(do_ubd_request, &ubd_dev->lock);
ubd_dev->queue->queuedata = ubd_dev;
blk_queue_max_hw_segments(ubd_dev->queue, MAX_SG);
- err = ubd_disk_register(MAJOR_NR, ubd_dev->size, n, &ubd_gendisk[n]);
+ err = ubd_disk_register(UBD_MAJOR, ubd_dev->size, n, &ubd_gendisk[n]);
if(err){
*error_out = "Failed to register device";
goto out_cleanup;
}
- if(fake_major != MAJOR_NR)
+ if (fake_major != UBD_MAJOR)
ubd_disk_register(fake_major, ubd_dev->size, n,
&fake_gendisk[n]);
- /* perhaps this should also be under the "if (fake_major)" above */
- /* using the fake_disk->disk_name and also the fakehd_set name */
+ /*
+ * Perhaps this should also be under the "if (fake_major)" above
+ * using the fake_disk->disk_name
+ */
if (fake_ide)
make_ide_entries(ubd_gendisk[n]->disk_name);
char *error;
int i, err;
- if (register_blkdev(MAJOR_NR, "ubd"))
+ if (register_blkdev(UBD_MAJOR, "ubd"))
return -1;
- if (fake_major != MAJOR_NR) {
+ if (fake_major != UBD_MAJOR) {
char name[sizeof("ubd_nnn\0")];
snprintf(name, sizeof(name), "ubd_%d", fake_major);
device_initcall(ubd_driver_init);
-static int ubd_open(struct inode *inode, struct file *filp)
+static int ubd_open(struct block_device *bdev, fmode_t mode)
{
- struct gendisk *disk = inode->i_bdev->bd_disk;
+ struct gendisk *disk = bdev->bd_disk;
struct ubd *ubd_dev = disk->private_data;
int err = 0;
/* This should no more be needed. And it didn't work anyway to exclude
* read-write remounting of filesystems.*/
- /*if((filp->f_mode & FMODE_WRITE) && !ubd_dev->openflags.w){
+ /*if((mode & FMODE_WRITE) && !ubd_dev->openflags.w){
if(--ubd_dev->count == 0) ubd_close_dev(ubd_dev);
err = -EROFS;
}*/
return err;
}
-static int ubd_release(struct inode * inode, struct file * file)
+static int ubd_release(struct gendisk *disk, fmode_t mode)
{
- struct gendisk *disk = inode->i_bdev->bd_disk;
struct ubd *ubd_dev = disk->private_data;
if(--ubd_dev->count == 0)
* by one word. Thanks to Lynn Kerby for the fix and James McMechan
* for the original diagnosis.
*/
- if(*cow_offset == ((bitmap_len + sizeof(unsigned long) - 1) /
- sizeof(unsigned long) - 1))
+ if (*cow_offset == (DIV_ROUND_UP(bitmap_len,
+ sizeof(unsigned long)) - 1))
(*cow_offset)--;
bitmap_words[0] = bitmap[*cow_offset];
}
/* Called with dev->lock held */
-static void do_ubd_request(request_queue_t *q)
+static void do_ubd_request(struct request_queue *q)
{
struct io_thread_req *io_req;
struct request *req;
+ sector_t sector;
int n;
while(1){
struct ubd *dev = q->queuedata;
if(dev->end_sg == 0){
- struct request *req = elv_next_request(q);
+ struct request *req = blk_fetch_request(q);
if(req == NULL)
return;
dev->request = req;
- blkdev_dequeue_request(req);
dev->start_sg = 0;
dev->end_sg = blk_rq_map_sg(q, req, dev->sg);
}
req = dev->request;
+ sector = blk_rq_pos(req);
while(dev->start_sg < dev->end_sg){
struct scatterlist *sg = &dev->sg[dev->start_sg];
return;
}
prepare_request(req, io_req,
- (unsigned long long) req->sector << 9,
- sg->offset, sg->length, sg->page);
+ (unsigned long long)sector << 9,
+ sg->offset, sg->length, sg_page(sg));
+ sector += sg->length >> 9;
n = os_write_file(thread_fd, &io_req,
sizeof(struct io_thread_req *));
if(n != sizeof(struct io_thread_req *)){
"errno = %d\n", -n);
else if(list_empty(&dev->restart))
list_add(&dev->restart, &restart);
+ kfree(io_req);
return;
}
- req->sector += sg->length >> 9;
dev->start_sg++;
}
dev->end_sg = 0;
return 0;
}
-static int ubd_ioctl(struct inode * inode, struct file * file,
+static int ubd_ioctl(struct block_device *bdev, fmode_t mode,
unsigned int cmd, unsigned long arg)
{
- struct ubd *ubd_dev = inode->i_bdev->bd_disk->private_data;
- struct hd_driveid ubd_id = {
- .cyls = 0,
- .heads = 128,
- .sectors = 32,
- };
+ struct ubd *ubd_dev = bdev->bd_disk->private_data;
+ u16 ubd_id[ATA_ID_WORDS];
switch (cmd) {
struct cdrom_volctrl volume;
case HDIO_GET_IDENTITY:
- ubd_id.cyls = ubd_dev->size / (128 * 32 * 512);
+ memset(&ubd_id, 0, ATA_ID_WORDS * 2);
+ ubd_id[ATA_ID_CYLS] = ubd_dev->size / (128 * 32 * 512);
+ ubd_id[ATA_ID_HEADS] = 128;
+ ubd_id[ATA_ID_SECTORS] = 32;
if(copy_to_user((char __user *) arg, (char *) &ubd_id,
sizeof(ubd_id)))
return -EFAULT;
return -EINVAL;
}
-static int path_requires_switch(char *from_cmdline, char *from_cow, char *cow)
-{
- struct uml_stat buf1, buf2;
- int err;
-
- if(from_cmdline == NULL)
- return 0;
- if(!strcmp(from_cmdline, from_cow))
- return 0;
-
- err = os_stat_file(from_cmdline, &buf1);
- if(err < 0){
- printk("Couldn't stat '%s', err = %d\n", from_cmdline, -err);
- return 0;
- }
- err = os_stat_file(from_cow, &buf2);
- if(err < 0){
- printk("Couldn't stat '%s', err = %d\n", from_cow, -err);
- return 1;
- }
- if((buf1.ust_dev == buf2.ust_dev) && (buf1.ust_ino == buf2.ust_ino))
- return 0;
-
- printk("Backing file mismatch - \"%s\" requested,\n"
- "\"%s\" specified in COW header of \"%s\"\n",
- from_cmdline, from_cow, cow);
- return 1;
-}
-
-static int backing_file_mismatch(char *file, __u64 size, time_t mtime)
-{
- unsigned long modtime;
- unsigned long long actual;
- int err;
-
- err = os_file_modtime(file, &modtime);
- if(err < 0){
- printk("Failed to get modification time of backing file "
- "\"%s\", err = %d\n", file, -err);
- return err;
- }
-
- err = os_file_size(file, &actual);
- if(err < 0){
- printk("Failed to get size of backing file \"%s\", "
- "err = %d\n", file, -err);
- return err;
- }
-
- if(actual != size){
- /*__u64 can be a long on AMD64 and with %lu GCC complains; so
- * the typecast.*/
- printk("Size mismatch (%llu vs %llu) of COW header vs backing "
- "file\n", (unsigned long long) size, actual);
- return -EINVAL;
- }
- if(modtime != mtime){
- printk("mtime mismatch (%ld vs %ld) of COW header vs backing "
- "file\n", mtime, modtime);
- return -EINVAL;
- }
- return 0;
-}
-
-int read_cow_bitmap(int fd, void *buf, int offset, int len)
-{
- int err;
-
- err = os_seek_file(fd, offset);
- if(err < 0)
- return err;
-
- err = os_read_file(fd, buf, len);
- if(err < 0)
- return err;
-
- return 0;
-}
-
-int open_ubd_file(char *file, struct openflags *openflags, int shared,
- char **backing_file_out, int *bitmap_offset_out,
- unsigned long *bitmap_len_out, int *data_offset_out,
- int *create_cow_out)
-{
- time_t mtime;
- unsigned long long size;
- __u32 version, align;
- char *backing_file;
- int fd, err, sectorsize, asked_switch, mode = 0644;
-
- fd = os_open_file(file, *openflags, mode);
- if (fd < 0) {
- if ((fd == -ENOENT) && (create_cow_out != NULL))
- *create_cow_out = 1;
- if (!openflags->w ||
- ((fd != -EROFS) && (fd != -EACCES)))
- return fd;
- openflags->w = 0;
- fd = os_open_file(file, *openflags, mode);
- if (fd < 0)
- return fd;
- }
-
- if(shared)
- printk("Not locking \"%s\" on the host\n", file);
- else {
- err = os_lock_file(fd, openflags->w);
- if(err < 0){
- printk("Failed to lock '%s', err = %d\n", file, -err);
- goto out_close;
- }
- }
-
- /* Successful return case! */
- if(backing_file_out == NULL)
- return fd;
-
- err = read_cow_header(file_reader, &fd, &version, &backing_file, &mtime,
- &size, §orsize, &align, bitmap_offset_out);
- if(err && (*backing_file_out != NULL)){
- printk("Failed to read COW header from COW file \"%s\", "
- "errno = %d\n", file, -err);
- goto out_close;
- }
- if(err)
- return fd;
-
- asked_switch = path_requires_switch(*backing_file_out, backing_file, file);
-
- /* Allow switching only if no mismatch. */
- if (asked_switch && !backing_file_mismatch(*backing_file_out, size, mtime)) {
- printk("Switching backing file to '%s'\n", *backing_file_out);
- err = write_cow_header(file, fd, *backing_file_out,
- sectorsize, align, &size);
- if (err) {
- printk("Switch failed, errno = %d\n", -err);
- goto out_close;
- }
- } else {
- *backing_file_out = backing_file;
- err = backing_file_mismatch(*backing_file_out, size, mtime);
- if (err)
- goto out_close;
- }
-
- cow_sizes(version, size, sectorsize, align, *bitmap_offset_out,
- bitmap_len_out, data_offset_out);
-
- return fd;
- out_close:
- os_close_file(fd);
- return err;
-}
-
-int create_cow_file(char *cow_file, char *backing_file, struct openflags flags,
- int sectorsize, int alignment, int *bitmap_offset_out,
- unsigned long *bitmap_len_out, int *data_offset_out)
-{
- int err, fd;
-
- flags.c = 1;
- fd = open_ubd_file(cow_file, &flags, 0, NULL, NULL, NULL, NULL, NULL);
- if(fd < 0){
- err = fd;
- printk("Open of COW file '%s' failed, errno = %d\n", cow_file,
- -err);
- goto out;
- }
-
- err = init_cow_file(fd, cow_file, backing_file, sectorsize, alignment,
- bitmap_offset_out, bitmap_len_out,
- data_offset_out);
- if(!err)
- return fd;
- os_close_file(fd);
- out:
- return err;
-}
-
static int update_bitmap(struct io_thread_req *req)
{
int n;
return 0;
}
-void do_io(struct io_thread_req *req)
+static void do_io(struct io_thread_req *req)
{
char *buf;
unsigned long len;
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff