diff options
Diffstat (limited to 'xenolinux-2.4.21-pre4-sparse/arch/xeno/drivers/block/xl_segment.c')
| -rw-r--r-- | xenolinux-2.4.21-pre4-sparse/arch/xeno/drivers/block/xl_segment.c | 275 |
1 files changed, 275 insertions, 0 deletions
diff --git a/xenolinux-2.4.21-pre4-sparse/arch/xeno/drivers/block/xl_segment.c b/xenolinux-2.4.21-pre4-sparse/arch/xeno/drivers/block/xl_segment.c new file mode 100644 index 0000000000..da14be14df --- /dev/null +++ b/xenolinux-2.4.21-pre4-sparse/arch/xeno/drivers/block/xl_segment.c @@ -0,0 +1,275 @@ +/* + * xl_segment.c + * + * XenoLinux virtual disk driver. + */ + + +#include <linux/config.h> +#include <linux/module.h> + +#include <linux/proc_fs.h> +#include <linux/delay.h> +#include <asm/uaccess.h> +#include <asm/atomic.h> + +#include <asm/hypervisor-ifs/block.h> +#include <asm/hypervisor-ifs/hypervisor-if.h> + +static struct proc_dir_entry *vhd; +xv_disk_t xvd; + +extern atomic_t xlblk_control_count; /* xl_block.c */ + +/******************************************************************/ + +static int proc_read_vhd(char *page, char **start, off_t off, + int count, int *eof, void *data) +{ + return 0; +} + +#define isdelim(c) \ + (c==' '||c==','||c=='\n'||c=='\r'||c=='\t'||c==':'||c=='('||c==')' ? 1 : 0) + +char *get_string(char *string) /* a bit like strtok */ +{ + static char *temp; + int loop = 0; + + if (string != NULL) + temp = string; + else + string = temp; + + try_again: + + while (!isdelim(string[loop])) + { + if (string[loop] == '\0') + return NULL; + loop++; + } + + string[loop] = '\0'; + temp = (string + loop + 1); + + if (loop == 0) + { + string = temp; + goto try_again; + } + + return string; +} + + +#define isdigit(c) (c >= '0' && c <= '9' ? 1 : 0) +unsigned long to_number(char *string) /* atoi */ +{ + unsigned long value = 0; + + if (string == NULL) return 0; + + while (!isdigit(*string) && *string != '\0') string++; + + while (isdigit(*string)) + { + value = value * 10 + (*string - '0'); + string++; + } + + return value; +} + +static int proc_write_vhd(struct file *file, const char *buffer, + unsigned long count, void *data) +{ + char *local = kmalloc((count + 1) * sizeof(char), GFP_KERNEL); + char *string; + int loop; + int counter; + xv_disk_t xvd; + + memset (&xvd, 0, sizeof(xvd)); + + if (copy_from_user(local, buffer, count)) + { + return -EFAULT; + } + local[count] = '\0'; + + string = get_string(local); /* look for Domain */ + if (string == NULL) /* empty string */ + { + return count; + } + if (*string != 'd' && *string != 'D') + { + printk (KERN_ALERT + "error: domain specifier missing [%s]. should be \"domain\".\n", + string); + return count; + } + + string = get_string(NULL); /* domain number */ + if (string == NULL) + { + printk (KERN_ALERT "error: domain number missing\n"); + return count; + } + xvd.domain = (int) to_number(string); + + string = get_string(NULL); + if (string && (strcmp(string, "RO") == 0 || strcmp(string, "ro") == 0)) + { + xvd.mode = XEN_DISK_READ_ONLY; + } + else if (string && (strcmp(string, "RW") == 0 || strcmp(string, "rw") == 0)) + { + xvd.mode = XEN_DISK_READ_ONLY; + } + else + { + printk (KERN_ALERT + "error: bad mode [%s]. should be \"rw\" or \"ro\".\n", + string); + return count; + } + + string = get_string(NULL); /* look for Segment */ + if (string == NULL || (*string != 's' && *string != 'S')) + { + printk (KERN_ALERT + "error: segment specifier missing [%s]. should be \"segment\".\n", + string); + return count; + } + + string = get_string(NULL); /* segment number */ + if (string == NULL) + { + printk (KERN_ALERT "error: segment number missing\n"); + return count; + } + xvd.segment = (int) to_number(string); + + string = get_string(NULL); /* look for Extents */ + if (string == NULL || (*string != 'e' && *string != 'E')) + { + printk (KERN_ALERT + "error: extents specifier missing [%s]. should be \"extents\".\n", + string); + return count; + } + + string = get_string(NULL); /* number of extents */ + if (string == NULL) + { + printk (KERN_ALERT "error: number of extents missing\n"); + return count; + } + xvd.ext_count = (int) to_number(string); + + /* ignore parenthesis */ + + for (loop = 0; loop < xvd.ext_count; loop++) + { + string = get_string(NULL); /* look for Disk */ + if (string == NULL || (*string != 'd' && *string != 'D')) + { + printk (KERN_ALERT + "hmm, extent disk specifier missing [%s]. should be \"disk\".\n", + string); + return count; + } + string = get_string(NULL); /* disk number */ + if (string == NULL) + { + printk (KERN_ALERT "error: disk number missing\n"); + return count; + } + xvd.extents[loop].disk = (int) to_number(string); + + string = get_string(NULL); /* look for Offset */ + if (string == NULL || (*string != 'o' && *string != 'O')) + { + printk (KERN_ALERT + "error: disk offset missing [%s]. should be \"offset\".\n", + string); + return count; + } + string = get_string(NULL); /* offset */ + if (string == NULL) + { + printk (KERN_ALERT "error: offset missing\n"); + return count; + } + xvd.extents[loop].offset = to_number(string); + + string = get_string(NULL); /* look for Size */ + if (string == NULL || (*string != 's' && *string != 'S')) + { + printk (KERN_ALERT + "error: extent size missing [%s]. should be \"size\".\n", + string); + return count; + } + string = get_string(NULL); /* size */ + if (string == NULL) + { + printk (KERN_ALERT "error: extent size missing\n"); + return count; + } + xvd.extents[loop].size = to_number(string); + } + + { + /* get lock xlblk_control_lock */ + counter = atomic_read(&xlblk_control_count); + atomic_inc(&xlblk_control_count); + /* release lock xlblk_control_lock */ + } + + hypervisor_request (NULL, XEN_BLOCK_SEG_CREATE, (char *)&xvd, + 0, 0, (kdev_t) 0); + HYPERVISOR_block_io_op(); + + while (atomic_read(&xlblk_control_count) != counter) barrier(); + + /* while ( blk_ring->resp_prod != 1 ) barrier(); */ + + /* mdelay(1000); */ + + return count; +} + +/******************************************************************/ + +int __init xlseg_init(void) +{ + vhd = create_proc_entry("xeno/dom0/vhd", 0644, NULL); + if (vhd == NULL) + { + panic ("xlseg_init: unable to create vhd proc entry\n"); + } + vhd->data = NULL; + vhd->read_proc = proc_read_vhd; + vhd->write_proc = proc_write_vhd; + vhd->owner = THIS_MODULE; + + memset(&xvd, 0, sizeof(xvd)); + + printk(KERN_ALERT "XenoLinux Virtual Disk Device Driver installed\n"); + return 0; +} + +static void __exit xlseg_cleanup(void) +{ + printk(KERN_ALERT "XenoLinux Virtual Disk Device Driver uninstalled\n"); +} + +#ifdef MODULE +module_init(xlseg_init); +module_exit(xlseg_cleanup); +#endif |