uml: clean up arch/um/drivers/ubd_kern.c
Make some global functions and variables static. And remove some useless declarations for local functions, since we just need to move their definitions ahead. [jdike@addtoit.com: checkpatch cleanups] Signed-off-by: WANG Cong <wangcong@zeuux.org> Signed-off-by: Jeff Dike <jdike@addtoit.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
WANG Cong
Linus Torvalds
Родитель
4415d8a5aa
Коммит
5dc62b1b64
|
|
@ -72,18 +72,6 @@ struct io_thread_req {
|
|||
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;
|
||||
|
|
@ -200,7 +188,7 @@ struct ubd {
|
|||
}
|
||||
|
||||
/* 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;
|
||||
|
|
@ -463,7 +451,7 @@ __uml_help(udb_setup,
|
|||
static void do_ubd_request(struct request_queue * q);
|
||||
|
||||
/* Only changed by ubd_init, which is an initcall. */
|
||||
int thread_fd = -1;
|
||||
static int thread_fd = -1;
|
||||
|
||||
static void ubd_end_request(struct request *req, int bytes, int error)
|
||||
{
|
||||
|
|
@ -531,7 +519,7 @@ static irqreturn_t ubd_intr(int irq, void *dev)
|
|||
/* 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);
|
||||
|
|
@ -547,6 +535,192 @@ static inline int ubd_file_size(struct ubd *ubd_dev, __u64 *size_out)
|
|||
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);
|
||||
|
|
@ -1166,185 +1340,6 @@ static int ubd_ioctl(struct inode * inode, struct file * file,
|
|||
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;
|
||||
|
|
@ -1369,7 +1364,7 @@ static int update_bitmap(struct io_thread_req *req)
|
|||
return 0;
|
||||
}
|
||||
|
||||
void do_io(struct io_thread_req *req)
|
||||
static void do_io(struct io_thread_req *req)
|
||||
{
|
||||
char *buf;
|
||||
unsigned long len;
|
||||
|
|
|
|||
Загрузка…
Ссылка в новой задаче