#include "asm/irq.h"
#include "asm/types.h"
#include "asm/tlbflush.h"
-#include "user_util.h"
#include "mem_user.h"
#include "kern_util.h"
#include "kern.h"
enum ubd_req { UBD_READ, UBD_WRITE };
struct io_thread_req {
+ struct request *req;
enum ubd_req op;
int fds[2];
unsigned long offsets[2];
bits = sizeof(data[0]) * 8;
n = bit / bits;
off = bit % bits;
- return((data[n] & (1 << off)) != 0);
+ return (data[n] & (1 << off)) != 0;
}
static inline void ubd_set_bit(__u64 bit, unsigned char *data)
#define DRIVER_NAME "uml-blkdev"
-/* Can be taken in interrupt context, and is passed to the block layer to lock
- * the request queue. Kernel side code knows that. */
-static DEFINE_SPINLOCK(ubd_io_lock);
-
static DEFINE_MUTEX(ubd_lock);
-/* XXX - this made sense in 2.4 days, now it's only used as a boolean, and
- * probably it doesn't make sense even for that. */
-static int do_ubd;
-
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,
.getgeo = ubd_getgeo,
};
-/* Protected by the queue_lock */
-static request_queue_t *ubd_queue;
-
/* Protected by ubd_lock */
static int fake_major = MAJOR_NR;
-
static struct gendisk *ubd_gendisk[MAX_DEV];
static struct gendisk *fake_gendisk[MAX_DEV];
#define OPEN_FLAGS ((struct openflags) { .r = 1, .w = 1, .s = 0, .c = 0, \
.cl = 1 })
#endif
-
-/* Not protected - changed only in ubd_setup_common and then only to
- * to enable O_SYNC.
- */
static struct openflags global_openflags = OPEN_FLAGS;
struct cow {
unsigned long *bitmap;
unsigned long bitmap_len;
int bitmap_offset;
- int data_offset;
+ int data_offset;
};
+#define MAX_SG 64
+
struct ubd {
+ struct list_head restart;
/* name (and fd, below) of the file opened for writing, either the
* backing or the cow file. */
char *file;
unsigned no_cow:1;
struct cow cow;
struct platform_device pdev;
+ struct request_queue *queue;
+ spinlock_t lock;
+ struct scatterlist sg[MAX_SG];
+ struct request *request;
+ int start_sg, end_sg;
};
#define DEFAULT_COW { \
.file = NULL, \
- .fd = -1, \
- .bitmap = NULL, \
+ .fd = -1, \
+ .bitmap = NULL, \
.bitmap_offset = 0, \
- .data_offset = 0, \
+ .data_offset = 0, \
}
#define DEFAULT_UBD { \
.size = -1, \
.boot_openflags = OPEN_FLAGS, \
.openflags = OPEN_FLAGS, \
- .no_cow = 0, \
+ .no_cow = 0, \
.shared = 0, \
- .cow = DEFAULT_COW, \
+ .cow = DEFAULT_COW, \
+ .lock = SPIN_LOCK_UNLOCKED, \
+ .request = NULL, \
+ .start_sg = 0, \
+ .end_sg = 0, \
}
+/* Protected by ubd_lock */
struct ubd ubd_devs[MAX_DEV] = { [ 0 ... MAX_DEV - 1 ] = DEFAULT_UBD };
/* Only changed by fake_ide_setup which is a setup */
ent = create_proc_entry("media", S_IFREG|S_IRUGO, dir);
if(!ent) return;
- ent->nlink = 1;
ent->data = NULL;
ent->read_proc = proc_ide_read_media;
ent->write_proc = NULL;
static int fake_ide_setup(char *str)
{
fake_ide = 1;
- return(1);
+ return 1;
}
__setup("fake_ide", fake_ide_setup);
if(isdigit(*str)) {
n = simple_strtoul(str, &end, 0);
if(end == str)
- return(-1);
+ return -1;
*ptr = end;
}
else if (('a' <= *str) && (*str <= 'z')) {
str++;
*ptr = str;
}
- return(n);
+ return n;
}
/* If *index_out == -1 at exit, the passed option was a general one;
* otherwise, the str pointer is used (and owned) inside ubd_devs array, so it
* should not be freed on exit.
*/
-static int ubd_setup_common(char *str, int *index_out)
+static int ubd_setup_common(char *str, int *index_out, char **error_out)
{
struct ubd *ubd_dev;
struct openflags flags = global_openflags;
char *backing_file;
- int n, err, i;
+ int n, err = 0, i;
if(index_out) *index_out = -1;
n = *str;
str++;
if(!strcmp(str, "sync")){
global_openflags = of_sync(global_openflags);
- return(0);
+ goto out1;
}
+
+ err = -EINVAL;
major = simple_strtoul(str, &end, 0);
if((*end != '\0') || (end == str)){
- printk(KERN_ERR
- "ubd_setup : didn't parse major number\n");
- return(1);
+ *error_out = "Didn't parse major number";
+ goto out1;
}
- err = 1;
- mutex_lock(&ubd_lock);
- if(fake_major != MAJOR_NR){
- printk(KERN_ERR "Can't assign a fake major twice\n");
- goto out1;
- }
+ mutex_lock(&ubd_lock);
+ if(fake_major != MAJOR_NR){
+ *error_out = "Can't assign a fake major twice";
+ goto out1;
+ }
- fake_major = major;
+ fake_major = major;
printk(KERN_INFO "Setting extra ubd major number to %d\n",
major);
- err = 0;
- out1:
- mutex_unlock(&ubd_lock);
- return(err);
+ err = 0;
+ out1:
+ mutex_unlock(&ubd_lock);
+ return err;
}
n = parse_unit(&str);
if(n < 0){
- printk(KERN_ERR "ubd_setup : couldn't parse unit number "
- "'%s'\n", str);
- return(1);
+ *error_out = "Couldn't parse device number";
+ return -EINVAL;
}
if(n >= MAX_DEV){
- printk(KERN_ERR "ubd_setup : index %d out of range "
- "(%d devices, from 0 to %d)\n", n, MAX_DEV, MAX_DEV - 1);
- return(1);
+ *error_out = "Device number out of range";
+ return 1;
}
- err = 1;
+ err = -EBUSY;
mutex_lock(&ubd_lock);
ubd_dev = &ubd_devs[n];
if(ubd_dev->file != NULL){
- printk(KERN_ERR "ubd_setup : device already configured\n");
+ *error_out = "Device is already configured";
goto out;
}
if (index_out)
*index_out = n;
+ err = -EINVAL;
for (i = 0; i < sizeof("rscd="); i++) {
switch (*str) {
case 'r':
str++;
goto break_loop;
default:
- printk(KERN_ERR "ubd_setup : Expected '=' or flag letter (r, s, c, or d)\n");
+ *error_out = "Expected '=' or flag letter "
+ "(r, s, c, or d)";
goto out;
}
str++;
}
- if (*str == '=')
- printk(KERN_ERR "ubd_setup : Too many flags specified\n");
- else
- printk(KERN_ERR "ubd_setup : Expected '='\n");
+ if (*str == '=')
+ *error_out = "Too many flags specified";
+ else
+ *error_out = "Missing '='";
goto out;
break_loop:
- err = 0;
backing_file = strchr(str, ',');
- if (!backing_file) {
+ if (backing_file == NULL)
backing_file = strchr(str, ':');
- }
- if(backing_file){
- if(ubd_dev->no_cow)
- printk(KERN_ERR "Can't specify both 'd' and a "
- "cow file\n");
+ if(backing_file != NULL){
+ if(ubd_dev->no_cow){
+ *error_out = "Can't specify both 'd' and a cow file";
+ goto out;
+ }
else {
*backing_file = '\0';
backing_file++;
}
}
+ err = 0;
ubd_dev->file = str;
ubd_dev->cow.file = backing_file;
ubd_dev->boot_openflags = flags;
out:
mutex_unlock(&ubd_lock);
- return(err);
+ return err;
}
static int ubd_setup(char *str)
{
- ubd_setup_common(str, NULL);
- return(1);
+ char *error;
+ int err;
+
+ err = ubd_setup_common(str, NULL, &error);
+ if(err)
+ printk(KERN_ERR "Failed to initialize device with \"%s\" : "
+ "%s\n", str, error);
+ return 1;
}
__setup("ubd", ubd_setup);
" use either a ':' or a ',': the first one allows writing things like;\n"
" ubd0=~/Uml/root_cow:~/Uml/root_backing_file\n"
" while with a ',' the shell would not expand the 2nd '~'.\n"
-" When using only one filename, UML will detect whether to thread it like\n"
+" When using only one filename, UML will detect whether to treat it like\n"
" a COW file or a backing file. To override this detection, add the 'd'\n"
" flag:\n"
" ubd0d=BackingFile\n"
{
printk("udb%s specified on command line is almost certainly a ubd -> "
"udb TYPO\n", str);
- return(1);
+ return 1;
}
__setup("udb", udb_setup);
/* Only changed by ubd_init, which is an initcall. */
int thread_fd = -1;
-/* Changed by ubd_handler, which is serialized because interrupts only
- * happen on CPU 0.
- * XXX: currently unused.
- */
-static int intr_count = 0;
-
-/* call ubd_finish if you need to serialize */
-static void __ubd_finish(struct request *req, int error)
+static void ubd_end_request(struct request *req, int bytes, int uptodate)
{
- int nsect;
-
- if(error){
- end_request(req, 0);
- return;
+ 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);
}
- nsect = req->current_nr_sectors;
- req->sector += nsect;
- req->buffer += nsect << 9;
- req->errors = 0;
- req->nr_sectors -= nsect;
- req->current_nr_sectors = 0;
- end_request(req, 1);
}
/* 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 error)
+static inline void ubd_finish(struct request *req, int bytes)
{
- spin_lock(&ubd_io_lock);
- __ubd_finish(req, error);
- spin_unlock(&ubd_io_lock);
+ if(bytes < 0){
+ ubd_end_request(req, 0, 0);
+ return;
+ }
+ ubd_end_request(req, bytes, 1);
}
+static LIST_HEAD(restart);
+
/* XXX - move this inside ubd_intr. */
-/* Called without ubd_io_lock held, and only in interrupt context. */
+/* Called without dev->lock held, and only in interrupt context. */
static void ubd_handler(void)
{
- struct io_thread_req req;
- struct request *rq = elv_next_request(ubd_queue);
+ struct io_thread_req *req;
+ struct request *rq;
+ struct ubd *ubd;
+ struct list_head *list, *next_ele;
+ unsigned long flags;
int n;
- do_ubd = 0;
- intr_count++;
- n = os_read_file(thread_fd, &req, sizeof(req));
- if(n != sizeof(req)){
- printk(KERN_ERR "Pid %d - spurious interrupt in ubd_handler, "
- "err = %d\n", os_getpid(), -n);
- spin_lock(&ubd_io_lock);
- end_request(rq, 0);
- spin_unlock(&ubd_io_lock);
- return;
- }
+ while(1){
+ n = os_read_file(thread_fd, &req,
+ sizeof(struct io_thread_req *));
+ if(n != sizeof(req)){
+ if(n == -EAGAIN)
+ break;
+ printk(KERN_ERR "spurious interrupt in ubd_handler, "
+ "err = %d\n", -n);
+ return;
+ }
- ubd_finish(rq, req.error);
- reactivate_fd(thread_fd, UBD_IRQ);
- spin_lock(&ubd_io_lock);
- do_ubd_request(ubd_queue);
- spin_unlock(&ubd_io_lock);
+ rq = req->req;
+ rq->nr_sectors -= req->length >> 9;
+ if(rq->nr_sectors == 0)
+ ubd_finish(rq, rq->hard_nr_sectors << 9);
+ kfree(req);
+ }
+ reactivate_fd(thread_fd, UBD_IRQ);
+
+ list_for_each_safe(list, next_ele, &restart){
+ ubd = container_of(list, struct ubd, restart);
+ list_del_init(&ubd->restart);
+ spin_lock_irqsave(&ubd->lock, flags);
+ do_ubd_request(ubd->queue);
+ spin_unlock_irqrestore(&ubd->lock, flags);
+ }
}
static irqreturn_t ubd_intr(int irq, void *dev)
{
ubd_handler();
- return(IRQ_HANDLED);
+ return IRQ_HANDLED;
}
/* Only changed by ubd_init, which is an initcall. */
char *file;
file = ubd_dev->cow.file ? ubd_dev->cow.file : ubd_dev->file;
- return(os_file_size(file, size_out));
+ return os_file_size(file, size_out);
}
static void ubd_close_dev(struct ubd *ubd_dev)
if(err < 0) goto error;
ubd_dev->cow.fd = err;
}
- return(0);
+ return 0;
error:
os_close_file(ubd_dev->fd);
- return(err);
+ return err;
+}
+
+static void ubd_device_release(struct device *dev)
+{
+ struct ubd *ubd_dev = dev->driver_data;
+
+ blk_cleanup_queue(ubd_dev->queue);
+ *ubd_dev = ((struct ubd) DEFAULT_UBD);
}
static int ubd_disk_register(int major, u64 size, int unit,
- struct gendisk **disk_out)
-
+ struct gendisk **disk_out)
{
struct gendisk *disk;
disk = alloc_disk(1 << UBD_SHIFT);
if(disk == NULL)
- return(-ENOMEM);
+ return -ENOMEM;
disk->major = major;
disk->first_minor = unit << UBD_SHIFT;
if (major == MAJOR_NR) {
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];
platform_device_register(&ubd_devs[unit].pdev);
disk->driverfs_dev = &ubd_devs[unit].pdev.dev;
}
disk->private_data = &ubd_devs[unit];
- disk->queue = ubd_queue;
+ disk->queue = ubd_devs[unit].queue;
add_disk(disk);
*disk_out = disk;
#define ROUND_BLOCK(n) ((n + ((1 << 9) - 1)) & (-1 << 9))
-static int ubd_add(int n)
+static int ubd_add(int n, char **error_out)
{
struct ubd *ubd_dev = &ubd_devs[n];
- int err;
+ int err = 0;
- err = -ENODEV;
if(ubd_dev->file == NULL)
goto out;
err = ubd_file_size(ubd_dev, &ubd_dev->size);
- if(err < 0)
+ if(err < 0){
+ *error_out = "Couldn't determine size of device's file";
goto out;
+ }
ubd_dev->size = ROUND_BLOCK(ubd_dev->size);
- err = ubd_disk_register(MAJOR_NR, ubd_dev->size, n, &ubd_gendisk[n]);
- if(err)
+ INIT_LIST_HEAD(&ubd_dev->restart);
+
+ err = -ENOMEM;
+ ubd_dev->queue = blk_init_queue(do_ubd_request, &ubd_dev->lock);
+ if (ubd_dev->queue == NULL) {
+ *error_out = "Failed to initialize device queue";
goto out;
+ }
+ 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]);
+ if(err){
+ *error_out = "Failed to register device";
+ goto out_cleanup;
+ }
if(fake_major != MAJOR_NR)
ubd_disk_register(fake_major, ubd_dev->size, n,
- &fake_gendisk[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 */
err = 0;
out:
return err;
+
+out_cleanup:
+ blk_cleanup_queue(ubd_dev->queue);
+ goto out;
}
-static int ubd_config(char *str)
+static int ubd_config(char *str, char **error_out)
{
int n, ret;
+ /* This string is possibly broken up and stored, so it's only
+ * freed if ubd_setup_common fails, or if only general options
+ * were set.
+ */
str = kstrdup(str, GFP_KERNEL);
if (str == NULL) {
- printk(KERN_ERR "ubd_config failed to strdup string\n");
- ret = 1;
- goto out;
+ *error_out = "Failed to allocate memory";
+ return -ENOMEM;
}
- ret = ubd_setup_common(str, &n);
- if (ret) {
- ret = -1;
+
+ ret = ubd_setup_common(str, &n, error_out);
+ if (ret)
goto err_free;
- }
+
if (n == -1) {
ret = 0;
goto err_free;
}
- mutex_lock(&ubd_lock);
- ret = ubd_add(n);
+ mutex_lock(&ubd_lock);
+ ret = ubd_add(n, error_out);
if (ret)
ubd_devs[n].file = NULL;
- mutex_unlock(&ubd_lock);
+ mutex_unlock(&ubd_lock);
out:
- return ret;
+ return ret;
err_free:
kfree(str);
n = parse_unit(&name);
if((n >= MAX_DEV) || (n < 0)){
*error_out = "ubd_get_config : device number out of range";
- return(-1);
+ return -1;
}
ubd_dev = &ubd_devs[n];
out:
mutex_unlock(&ubd_lock);
- return(len);
+ return len;
}
static int ubd_id(char **str, int *start_out, int *end_out)
{
- int n;
+ int n;
n = parse_unit(str);
- *start_out = 0;
- *end_out = MAX_DEV - 1;
- return n;
+ *start_out = 0;
+ *end_out = MAX_DEV - 1;
+ return n;
}
-static int ubd_remove(int n)
+static int ubd_remove(int n, char **error_out)
{
+ struct gendisk *disk = ubd_gendisk[n];
struct ubd *ubd_dev;
int err = -ENODEV;
mutex_lock(&ubd_lock);
- if(ubd_gendisk[n] == NULL)
- goto out;
-
ubd_dev = &ubd_devs[n];
if(ubd_dev->file == NULL)
if(ubd_dev->count > 0)
goto out;
- del_gendisk(ubd_gendisk[n]);
- put_disk(ubd_gendisk[n]);
ubd_gendisk[n] = NULL;
+ if(disk != NULL){
+ del_gendisk(disk);
+ put_disk(disk);
+ }
if(fake_gendisk[n] != NULL){
del_gendisk(fake_gendisk[n]);
fake_gendisk[n] = NULL;
}
- platform_device_unregister(&ubd_dev->pdev);
- *ubd_dev = ((struct ubd) DEFAULT_UBD);
err = 0;
+ platform_device_unregister(&ubd_dev->pdev);
out:
mutex_unlock(&ubd_lock);
return err;
}
-/* All these are called by mconsole in process context and without ubd-specific locks. */
+/* All these are called by mconsole in process context and without
+ * ubd-specific locks. The structure itself is const except for .list.
+ */
static struct mc_device ubd_mc = {
+ .list = LIST_HEAD_INIT(ubd_mc.list),
.name = "ubd",
.config = ubd_config,
- .get_config = ubd_get_config,
+ .get_config = ubd_get_config,
.id = ubd_id,
.remove = ubd_remove,
};
{
struct ubd *ubd_dev = &ubd_devs[0];
+ mutex_lock(&ubd_lock);
if(ubd_dev->file == NULL)
ubd_dev->file = "root_fs";
- return(0);
+ mutex_unlock(&ubd_lock);
+
+ return 0;
}
__initcall(ubd0_init);
+/* Used in ubd_init, which is an initcall */
static struct platform_driver ubd_driver = {
.driver = {
.name = DRIVER_NAME,
static int __init ubd_init(void)
{
- int i;
+ char *error;
+ int i, err;
if (register_blkdev(MAJOR_NR, "ubd"))
return -1;
- ubd_queue = blk_init_queue(do_ubd_request, &ubd_io_lock);
- if (!ubd_queue) {
- unregister_blkdev(MAJOR_NR, "ubd");
- return -1;
- }
-
if (fake_major != MAJOR_NR) {
char name[sizeof("ubd_nnn\0")];
return -1;
}
platform_driver_register(&ubd_driver);
- for (i = 0; i < MAX_DEV; i++)
- ubd_add(i);
+ mutex_lock(&ubd_lock);
+ for (i = 0; i < MAX_DEV; i++){
+ err = ubd_add(i, &error);
+ if(err)
+ printk(KERN_ERR "Failed to initialize ubd device %d :"
+ "%s\n", i, error);
+ }
+ mutex_unlock(&ubd_lock);
return 0;
}
"ubd : Failed to start I/O thread (errno = %d) - "
"falling back to synchronous I/O\n", -io_pid);
io_pid = -1;
- return(0);
+ return 0;
}
err = um_request_irq(UBD_IRQ, thread_fd, IRQ_READ, ubd_intr,
IRQF_DISABLED, "ubd", ubd_devs);
err = -EROFS;
}*/
out:
- return(err);
+ return err;
}
static int ubd_release(struct inode * inode, struct file * file)
if(--ubd_dev->count == 0)
ubd_close_dev(ubd_dev);
- return(0);
+ return 0;
}
static void cowify_bitmap(__u64 io_offset, int length, unsigned long *cow_mask,
if(ubd_test_bit(sector + i, (unsigned char *) bitmap))
ubd_set_bit(i, (unsigned char *)
&req->sector_mask);
- }
+ }
}
else cowify_bitmap(req->offset, req->length, &req->sector_mask,
&req->cow_offset, bitmap, bitmap_offset,
req->bitmap_words, bitmap_len);
}
-/* Called with ubd_io_lock held */
-static int prepare_request(struct request *req, struct io_thread_req *io_req)
+/* Called with dev->lock held */
+static void prepare_request(struct request *req, struct io_thread_req *io_req,
+ unsigned long long offset, int page_offset,
+ int len, struct page *page)
{
struct gendisk *disk = req->rq_disk;
struct ubd *ubd_dev = disk->private_data;
- __u64 offset;
- int len;
-
- /* This should be impossible now */
- if((rq_data_dir(req) == WRITE) && !ubd_dev->openflags.w){
- printk("Write attempted on readonly ubd device %s\n",
- disk->disk_name);
- end_request(req, 0);
- return(1);
- }
- offset = ((__u64) req->sector) << 9;
- len = req->current_nr_sectors << 9;
-
- io_req->fds[0] = (ubd_dev->cow.file != NULL) ? ubd_dev->cow.fd : ubd_dev->fd;
+ io_req->req = req;
+ io_req->fds[0] = (ubd_dev->cow.file != NULL) ? ubd_dev->cow.fd :
+ ubd_dev->fd;
io_req->fds[1] = ubd_dev->fd;
io_req->cow_offset = -1;
io_req->offset = offset;
io_req->op = (rq_data_dir(req) == READ) ? UBD_READ : UBD_WRITE;
io_req->offsets[0] = 0;
io_req->offsets[1] = ubd_dev->cow.data_offset;
- io_req->buffer = req->buffer;
+ io_req->buffer = page_address(page) + page_offset;
io_req->sectorsize = 1 << 9;
if(ubd_dev->cow.file != NULL)
- cowify_req(io_req, ubd_dev->cow.bitmap, ubd_dev->cow.bitmap_offset,
- ubd_dev->cow.bitmap_len);
+ cowify_req(io_req, ubd_dev->cow.bitmap,
+ ubd_dev->cow.bitmap_offset, ubd_dev->cow.bitmap_len);
- return(0);
}
-/* Called with ubd_io_lock held */
+/* Called with dev->lock held */
static void do_ubd_request(request_queue_t *q)
{
- struct io_thread_req io_req;
+ struct io_thread_req *io_req;
struct request *req;
- int err, n;
-
- if(thread_fd == -1){
- while((req = elv_next_request(q)) != NULL){
- err = prepare_request(req, &io_req);
- if(!err){
- do_io(&io_req);
- __ubd_finish(req, io_req.error);
- }
+ int n;
+
+ while(1){
+ struct ubd *dev = q->queuedata;
+ if(dev->end_sg == 0){
+ struct request *req = elv_next_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);
}
- }
- else {
- if(do_ubd || (req = elv_next_request(q)) == NULL)
- return;
- err = prepare_request(req, &io_req);
- if(!err){
- do_ubd = 1;
- n = os_write_file(thread_fd, (char *) &io_req,
- sizeof(io_req));
- if(n != sizeof(io_req))
- printk("write to io thread failed, "
- "errno = %d\n", -n);
+
+ req = dev->request;
+ while(dev->start_sg < dev->end_sg){
+ struct scatterlist *sg = &dev->sg[dev->start_sg];
+
+ io_req = kmalloc(sizeof(struct io_thread_req),
+ GFP_ATOMIC);
+ if(io_req == NULL){
+ if(list_empty(&dev->restart))
+ list_add(&dev->restart, &restart);
+ return;
+ }
+ prepare_request(req, io_req,
+ (unsigned long long) req->sector << 9,
+ sg->offset, sg->length, sg->page);
+
+ n = os_write_file(thread_fd, &io_req,
+ sizeof(struct io_thread_req *));
+ if(n != sizeof(struct io_thread_req *)){
+ if(n != -EAGAIN)
+ printk("write to io thread failed, "
+ "errno = %d\n", -n);
+ else if(list_empty(&dev->restart))
+ list_add(&dev->restart, &restart);
+ return;
+ }
+
+ req->sector += sg->length >> 9;
+ dev->start_sg++;
}
+ dev->end_sg = 0;
+ dev->request = NULL;
}
}
ubd_id.cyls = ubd_dev->size / (128 * 32 * 512);
if(copy_to_user((char __user *) arg, (char *) &ubd_id,
sizeof(ubd_id)))
- return(-EFAULT);
- return(0);
-
+ return -EFAULT;
+ return 0;
+
case CDROMVOLREAD:
if(copy_from_user(&volume, (char __user *) arg, sizeof(volume)))
- return(-EFAULT);
+ return -EFAULT;
volume.channel0 = 255;
volume.channel1 = 255;
volume.channel2 = 255;
volume.channel3 = 255;
if(copy_to_user((char __user *) arg, &volume, sizeof(volume)))
- return(-EFAULT);
- return(0);
+ return -EFAULT;
+ return 0;
}
- return(-EINVAL);
+ return -EINVAL;
}
static int path_requires_switch(char *from_cmdline, char *from_cow, char *cow)
if(err < 0){
printk("Failed to get modification time of backing file "
"\"%s\", err = %d\n", file, -err);
- return(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);
+ return err;
}
- if(actual != size){
+ 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);
+ return -EINVAL;
}
if(modtime != mtime){
printk("mtime mismatch (%ld vs %ld) of COW header vs backing "
"file\n", mtime, modtime);
- return(-EINVAL);
+ return -EINVAL;
}
- return(0);
+ return 0;
}
int read_cow_bitmap(int fd, void *buf, int offset, int len)
err = os_seek_file(fd, offset);
if(err < 0)
- return(err);
+ return err;
err = os_read_file(fd, buf, len);
if(err < 0)
- return(err);
+ return err;
- return(0);
+ return 0;
}
int open_ubd_file(char *file, struct openflags *openflags, int shared,
if (fd < 0) {
if ((fd == -ENOENT) && (create_cow_out != NULL))
*create_cow_out = 1;
- if (!openflags->w ||
- ((fd != -EROFS) && (fd != -EACCES)))
+ 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);
/* Successful return case! */
if(backing_file_out == NULL)
- return(fd);
+ return fd;
err = read_cow_header(file_reader, &fd, &version, &backing_file, &mtime,
&size, §orsize, &align, bitmap_offset_out);
goto out_close;
}
if(err)
- return(fd);
+ return fd;
asked_switch = path_requires_switch(*backing_file_out, backing_file, file);
cow_sizes(version, size, sectorsize, align, *bitmap_offset_out,
bitmap_len_out, data_offset_out);
- return fd;
+ return fd;
out_close:
os_close_file(fd);
return err;
bitmap_offset_out, bitmap_len_out,
data_offset_out);
if(!err)
- return(fd);
+ return fd;
os_close_file(fd);
out:
- return(err);
+ return err;
}
static int update_bitmap(struct io_thread_req *req)
int n;
if(req->cow_offset == -1)
- return(0);
+ return 0;
n = os_seek_file(req->fds[1], req->cow_offset);
if(n < 0){
printk("do_io - bitmap lseek failed : err = %d\n", -n);
- return(1);
+ return 1;
}
n = os_write_file(req->fds[1], &req->bitmap_words,
- sizeof(req->bitmap_words));
+ sizeof(req->bitmap_words));
if(n != sizeof(req->bitmap_words)){
printk("do_io - bitmap update failed, err = %d fd = %d\n", -n,
req->fds[1]);
- return(1);
+ return 1;
}
- return(0);
+ return 0;
}
void do_io(struct io_thread_req *req)
int io_thread(void *arg)
{
- struct io_thread_req req;
+ struct io_thread_req *req;
int n;
ignore_sigwinch_sig();
while(1){
- n = os_read_file(kernel_fd, &req, sizeof(req));
- if(n != sizeof(req)){
+ n = os_read_file(kernel_fd, &req,
+ sizeof(struct io_thread_req *));
+ if(n != sizeof(struct io_thread_req *)){
if(n < 0)
printk("io_thread - read failed, fd = %d, "
"err = %d\n", kernel_fd, -n);
continue;
}
io_count++;
- do_io(&req);
- n = os_write_file(kernel_fd, &req, sizeof(req));
- if(n != sizeof(req))
+ do_io(req);
+ n = os_write_file(kernel_fd, &req,
+ sizeof(struct io_thread_req *));
+ if(n != sizeof(struct io_thread_req *))
printk("io_thread - write failed, fd = %d, err = %d\n",
kernel_fd, -n);
}