[PATCH] uml: allow ubd devices to be shared in a cluster
This adds a 'c' option to the ubd switch which turns off host file locking so that the device can be shared, as with a cluster. There's also some whitespace cleanup while I was in this file. Signed-off-by: Jeff Dike <jdike@addtoit.com> Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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@ -71,7 +71,7 @@ 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,
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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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@ -168,6 +168,7 @@ struct ubd {
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__u64 size;
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struct openflags boot_openflags;
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struct openflags openflags;
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int shared;
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int no_cow;
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struct cow cow;
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struct platform_device pdev;
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@ -189,6 +190,7 @@ struct ubd {
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.boot_openflags = OPEN_FLAGS, \
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.openflags = OPEN_FLAGS, \
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.no_cow = 0, \
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.shared = 0, \
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.cow = DEFAULT_COW, \
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}
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@ -351,7 +353,7 @@ static int ubd_setup_common(char *str, int *index_out)
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if (index_out)
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*index_out = n;
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for (i = 0; i < 4; i++) {
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for (i = 0; i < sizeof("rscd="); i++) {
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switch (*str) {
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case 'r':
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flags.w = 0;
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@ -362,11 +364,14 @@ static int ubd_setup_common(char *str, int *index_out)
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case 'd':
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dev->no_cow = 1;
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break;
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case 'c':
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dev->shared = 1;
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break;
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case '=':
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str++;
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goto break_loop;
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default:
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printk(KERN_ERR "ubd_setup : Expected '=' or flag letter (r,s or d)\n");
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printk(KERN_ERR "ubd_setup : Expected '=' or flag letter (r, s, c, or d)\n");
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goto out;
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}
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str++;
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@ -567,9 +572,10 @@ static int ubd_open_dev(struct ubd *dev)
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create_cow = 0;
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create_ptr = (dev->cow.file != NULL) ? &create_cow : NULL;
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back_ptr = dev->no_cow ? NULL : &dev->cow.file;
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dev->fd = open_ubd_file(dev->file, &dev->openflags, back_ptr,
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&dev->cow.bitmap_offset, &dev->cow.bitmap_len,
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&dev->cow.data_offset, create_ptr);
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dev->fd = open_ubd_file(dev->file, &dev->openflags, dev->shared,
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back_ptr, &dev->cow.bitmap_offset,
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&dev->cow.bitmap_len, &dev->cow.data_offset,
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create_ptr);
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if((dev->fd == -ENOENT) && create_cow){
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dev->fd = create_cow_file(dev->file, dev->cow.file,
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@ -606,8 +612,8 @@ static int ubd_open_dev(struct ubd *dev)
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flags = dev->openflags;
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flags.w = 0;
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err = open_ubd_file(dev->cow.file, &flags, NULL, NULL, NULL,
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NULL, NULL);
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err = open_ubd_file(dev->cow.file, &flags, dev->shared, NULL,
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NULL, NULL, NULL, NULL);
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if(err < 0) goto error;
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dev->cow.fd = err;
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}
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@ -1182,7 +1188,7 @@ int read_cow_bitmap(int fd, void *buf, int offset, int len)
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return(0);
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}
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int open_ubd_file(char *file, struct openflags *openflags,
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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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@ -1206,11 +1212,15 @@ int open_ubd_file(char *file, struct openflags *openflags,
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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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/* Succesful return case! */
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if(backing_file_out == NULL)
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@ -1260,7 +1270,7 @@ int create_cow_file(char *cow_file, char *backing_file, struct openflags flags,
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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, NULL, NULL, NULL, NULL, NULL);
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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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