forked from luck/tmp_suning_uos_patched
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
parent
4415d8a5aa
commit
5dc62b1b64
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@ -72,18 +72,6 @@ struct io_thread_req {
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int error;
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};
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extern int open_ubd_file(char *file, struct openflags *openflags, int shared,
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char **backing_file_out, int *bitmap_offset_out,
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unsigned long *bitmap_len_out, int *data_offset_out,
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int *create_cow_out);
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extern int create_cow_file(char *cow_file, char *backing_file,
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struct openflags flags, int sectorsize,
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int alignment, int *bitmap_offset_out,
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unsigned long *bitmap_len_out,
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int *data_offset_out);
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extern int read_cow_bitmap(int fd, void *buf, int offset, int len);
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extern void do_io(struct io_thread_req *req);
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static inline int ubd_test_bit(__u64 bit, unsigned char *data)
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{
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__u64 n;
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@ -200,7 +188,7 @@ struct ubd {
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}
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/* Protected by ubd_lock */
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struct ubd ubd_devs[MAX_DEV] = { [ 0 ... MAX_DEV - 1 ] = DEFAULT_UBD };
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static struct ubd ubd_devs[MAX_DEV] = { [0 ... MAX_DEV - 1] = DEFAULT_UBD };
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/* Only changed by fake_ide_setup which is a setup */
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static int fake_ide = 0;
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@ -463,7 +451,7 @@ __uml_help(udb_setup,
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static void do_ubd_request(struct request_queue * q);
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/* Only changed by ubd_init, which is an initcall. */
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int thread_fd = -1;
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static int thread_fd = -1;
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static void ubd_end_request(struct request *req, int bytes, int error)
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{
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@ -531,7 +519,7 @@ static irqreturn_t ubd_intr(int irq, void *dev)
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/* Only changed by ubd_init, which is an initcall. */
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static int io_pid = -1;
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void kill_io_thread(void)
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static void kill_io_thread(void)
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{
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if(io_pid != -1)
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os_kill_process(io_pid, 1);
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@ -547,6 +535,192 @@ static inline int ubd_file_size(struct ubd *ubd_dev, __u64 *size_out)
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return os_file_size(file, size_out);
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}
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static int read_cow_bitmap(int fd, void *buf, int offset, int len)
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{
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int err;
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err = os_seek_file(fd, offset);
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if (err < 0)
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return err;
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err = os_read_file(fd, buf, len);
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if (err < 0)
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return err;
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return 0;
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}
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static int backing_file_mismatch(char *file, __u64 size, time_t mtime)
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{
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unsigned long modtime;
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unsigned long long actual;
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int err;
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err = os_file_modtime(file, &modtime);
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if (err < 0) {
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printk(KERN_ERR "Failed to get modification time of backing "
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"file \"%s\", err = %d\n", file, -err);
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return err;
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}
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err = os_file_size(file, &actual);
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if (err < 0) {
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printk(KERN_ERR "Failed to get size of backing file \"%s\", "
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"err = %d\n", file, -err);
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return err;
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}
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if (actual != size) {
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/*__u64 can be a long on AMD64 and with %lu GCC complains; so
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* the typecast.*/
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printk(KERN_ERR "Size mismatch (%llu vs %llu) of COW header "
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"vs backing file\n", (unsigned long long) size, actual);
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return -EINVAL;
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}
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if (modtime != mtime) {
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printk(KERN_ERR "mtime mismatch (%ld vs %ld) of COW header vs "
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"backing file\n", mtime, modtime);
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return -EINVAL;
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}
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return 0;
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}
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static int path_requires_switch(char *from_cmdline, char *from_cow, char *cow)
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{
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struct uml_stat buf1, buf2;
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int err;
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if (from_cmdline == NULL)
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return 0;
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if (!strcmp(from_cmdline, from_cow))
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return 0;
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err = os_stat_file(from_cmdline, &buf1);
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if (err < 0) {
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printk(KERN_ERR "Couldn't stat '%s', err = %d\n", from_cmdline,
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-err);
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return 0;
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}
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err = os_stat_file(from_cow, &buf2);
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if (err < 0) {
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printk(KERN_ERR "Couldn't stat '%s', err = %d\n", from_cow,
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-err);
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return 1;
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}
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if ((buf1.ust_dev == buf2.ust_dev) && (buf1.ust_ino == buf2.ust_ino))
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return 0;
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printk(KERN_ERR "Backing file mismatch - \"%s\" requested, "
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"\"%s\" specified in COW header of \"%s\"\n",
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from_cmdline, from_cow, cow);
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return 1;
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}
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static int open_ubd_file(char *file, struct openflags *openflags, int shared,
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char **backing_file_out, int *bitmap_offset_out,
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unsigned long *bitmap_len_out, int *data_offset_out,
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int *create_cow_out)
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{
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time_t mtime;
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unsigned long long size;
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__u32 version, align;
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char *backing_file;
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int fd, err, sectorsize, asked_switch, mode = 0644;
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fd = os_open_file(file, *openflags, mode);
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if (fd < 0) {
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if ((fd == -ENOENT) && (create_cow_out != NULL))
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*create_cow_out = 1;
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if (!openflags->w ||
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((fd != -EROFS) && (fd != -EACCES)))
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return fd;
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openflags->w = 0;
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fd = os_open_file(file, *openflags, mode);
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if (fd < 0)
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return fd;
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}
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if (shared)
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printk(KERN_INFO "Not locking \"%s\" on the host\n", file);
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else {
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err = os_lock_file(fd, openflags->w);
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if (err < 0) {
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printk(KERN_ERR "Failed to lock '%s', err = %d\n",
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file, -err);
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goto out_close;
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}
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}
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/* Successful return case! */
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if (backing_file_out == NULL)
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return fd;
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err = read_cow_header(file_reader, &fd, &version, &backing_file, &mtime,
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&size, §orsize, &align, bitmap_offset_out);
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if (err && (*backing_file_out != NULL)) {
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printk(KERN_ERR "Failed to read COW header from COW file "
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"\"%s\", errno = %d\n", file, -err);
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goto out_close;
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}
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if (err)
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return fd;
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asked_switch = path_requires_switch(*backing_file_out, backing_file,
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file);
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/* Allow switching only if no mismatch. */
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if (asked_switch && !backing_file_mismatch(*backing_file_out, size,
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mtime)) {
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printk(KERN_ERR "Switching backing file to '%s'\n",
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*backing_file_out);
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err = write_cow_header(file, fd, *backing_file_out,
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sectorsize, align, &size);
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if (err) {
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printk(KERN_ERR "Switch failed, errno = %d\n", -err);
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goto out_close;
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}
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} else {
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*backing_file_out = backing_file;
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err = backing_file_mismatch(*backing_file_out, size, mtime);
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if (err)
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goto out_close;
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}
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cow_sizes(version, size, sectorsize, align, *bitmap_offset_out,
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bitmap_len_out, data_offset_out);
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return fd;
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out_close:
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os_close_file(fd);
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return err;
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}
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static int create_cow_file(char *cow_file, char *backing_file,
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struct openflags flags,
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int sectorsize, int alignment, int *bitmap_offset_out,
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unsigned long *bitmap_len_out, int *data_offset_out)
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{
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int err, fd;
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flags.c = 1;
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fd = open_ubd_file(cow_file, &flags, 0, NULL, NULL, NULL, NULL, NULL);
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if (fd < 0) {
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err = fd;
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printk(KERN_ERR "Open of COW file '%s' failed, errno = %d\n",
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cow_file, -err);
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goto out;
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}
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err = init_cow_file(fd, cow_file, backing_file, sectorsize, alignment,
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bitmap_offset_out, bitmap_len_out,
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data_offset_out);
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if (!err)
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return fd;
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os_close_file(fd);
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out:
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return err;
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}
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static void ubd_close_dev(struct ubd *ubd_dev)
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{
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os_close_file(ubd_dev->fd);
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@ -1166,185 +1340,6 @@ static int ubd_ioctl(struct inode * inode, struct file * file,
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return -EINVAL;
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}
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static int path_requires_switch(char *from_cmdline, char *from_cow, char *cow)
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{
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struct uml_stat buf1, buf2;
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int err;
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if(from_cmdline == NULL)
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return 0;
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if(!strcmp(from_cmdline, from_cow))
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return 0;
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err = os_stat_file(from_cmdline, &buf1);
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if(err < 0){
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printk("Couldn't stat '%s', err = %d\n", from_cmdline, -err);
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return 0;
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}
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err = os_stat_file(from_cow, &buf2);
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if(err < 0){
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printk("Couldn't stat '%s', err = %d\n", from_cow, -err);
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return 1;
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}
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if((buf1.ust_dev == buf2.ust_dev) && (buf1.ust_ino == buf2.ust_ino))
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return 0;
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printk("Backing file mismatch - \"%s\" requested,\n"
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"\"%s\" specified in COW header of \"%s\"\n",
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from_cmdline, from_cow, cow);
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return 1;
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}
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static int backing_file_mismatch(char *file, __u64 size, time_t mtime)
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{
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unsigned long modtime;
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unsigned long long actual;
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int err;
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err = os_file_modtime(file, &modtime);
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if(err < 0){
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printk("Failed to get modification time of backing file "
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"\"%s\", err = %d\n", file, -err);
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return err;
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}
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err = os_file_size(file, &actual);
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if(err < 0){
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printk("Failed to get size of backing file \"%s\", "
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"err = %d\n", file, -err);
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return err;
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}
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if(actual != size){
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/*__u64 can be a long on AMD64 and with %lu GCC complains; so
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* the typecast.*/
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printk("Size mismatch (%llu vs %llu) of COW header vs backing "
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"file\n", (unsigned long long) size, actual);
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return -EINVAL;
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}
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if(modtime != mtime){
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printk("mtime mismatch (%ld vs %ld) of COW header vs backing "
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"file\n", mtime, modtime);
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return -EINVAL;
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}
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return 0;
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}
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int read_cow_bitmap(int fd, void *buf, int offset, int len)
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{
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int err;
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err = os_seek_file(fd, offset);
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if(err < 0)
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return err;
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err = os_read_file(fd, buf, len);
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if(err < 0)
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return err;
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return 0;
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}
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int open_ubd_file(char *file, struct openflags *openflags, int shared,
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char **backing_file_out, int *bitmap_offset_out,
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unsigned long *bitmap_len_out, int *data_offset_out,
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int *create_cow_out)
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{
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time_t mtime;
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unsigned long long size;
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__u32 version, align;
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char *backing_file;
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int fd, err, sectorsize, asked_switch, mode = 0644;
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fd = os_open_file(file, *openflags, mode);
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if (fd < 0) {
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if ((fd == -ENOENT) && (create_cow_out != NULL))
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*create_cow_out = 1;
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if (!openflags->w ||
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((fd != -EROFS) && (fd != -EACCES)))
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return fd;
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openflags->w = 0;
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fd = os_open_file(file, *openflags, mode);
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if (fd < 0)
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return fd;
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}
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if(shared)
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printk("Not locking \"%s\" on the host\n", file);
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else {
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err = os_lock_file(fd, openflags->w);
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if(err < 0){
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printk("Failed to lock '%s', err = %d\n", file, -err);
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goto out_close;
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}
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}
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/* Successful return case! */
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if(backing_file_out == NULL)
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return fd;
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err = read_cow_header(file_reader, &fd, &version, &backing_file, &mtime,
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&size, §orsize, &align, bitmap_offset_out);
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if(err && (*backing_file_out != NULL)){
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printk("Failed to read COW header from COW file \"%s\", "
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"errno = %d\n", file, -err);
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goto out_close;
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}
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if(err)
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return fd;
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asked_switch = path_requires_switch(*backing_file_out, backing_file, file);
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/* Allow switching only if no mismatch. */
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if (asked_switch && !backing_file_mismatch(*backing_file_out, size, mtime)) {
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printk("Switching backing file to '%s'\n", *backing_file_out);
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err = write_cow_header(file, fd, *backing_file_out,
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sectorsize, align, &size);
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if (err) {
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printk("Switch failed, errno = %d\n", -err);
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goto out_close;
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}
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} else {
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*backing_file_out = backing_file;
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err = backing_file_mismatch(*backing_file_out, size, mtime);
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if (err)
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goto out_close;
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}
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cow_sizes(version, size, sectorsize, align, *bitmap_offset_out,
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bitmap_len_out, data_offset_out);
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return fd;
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out_close:
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os_close_file(fd);
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return err;
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}
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int create_cow_file(char *cow_file, char *backing_file, struct openflags flags,
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int sectorsize, int alignment, int *bitmap_offset_out,
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unsigned long *bitmap_len_out, int *data_offset_out)
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{
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int err, fd;
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flags.c = 1;
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fd = open_ubd_file(cow_file, &flags, 0, NULL, NULL, NULL, NULL, NULL);
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if(fd < 0){
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err = fd;
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printk("Open of COW file '%s' failed, errno = %d\n", cow_file,
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-err);
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goto out;
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}
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err = init_cow_file(fd, cow_file, backing_file, sectorsize, alignment,
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bitmap_offset_out, bitmap_len_out,
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data_offset_out);
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if(!err)
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return fd;
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os_close_file(fd);
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out:
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return err;
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}
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static int update_bitmap(struct io_thread_req *req)
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{
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int n;
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@ -1369,7 +1364,7 @@ static int update_bitmap(struct io_thread_req *req)
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return 0;
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}
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void do_io(struct io_thread_req *req)
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static void do_io(struct io_thread_req *req)
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{
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char *buf;
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unsigned long len;
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