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 2008-04-28 02:13:58 -07:00 committed by Linus Torvalds
parent 4415d8a5aa
commit 5dc62b1b64

View File

@ -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, &sectorsize, &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, &sectorsize, &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;