Add support for internal bitmaps
For version 0.90 superblocks, an internal bitmap can be specified at create. Signed-off-by: Neil Brown <neilb@cse.unsw.edu.au>
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e793c2e583
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55935d5180
21
Create.c
21
Create.c
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@ -341,11 +341,26 @@ int Create(struct supertype *st, char *mddev, int mdfd,
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array.nr_disks = array.working_disks + array.failed_disks;
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array.layout = layout;
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array.chunk_size = chunk*1024;
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printf("VERS = %d\n", vers);
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if (!st->ss->init_super(&super, &array))
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return 1;
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if (bitmap_file && strcmp(bitmap_file, "internal")==0) {
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if ((vers%100) < 2) {
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fprintf(stderr, Name ": internal bitmaps not supported by this kernel.\n");
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return 1;
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}
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if (!st->ss->add_internal_bitmap(super, bitmap_chunk, delay,
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size ? size : maxsize)) {
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fprintf(stderr, Name ": Given bitmap chunk size not supported.\n");
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return 1;
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}
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bitmap_file = NULL;
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}
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if ((vers % 100) >= 1) { /* can use different versions */
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mdu_array_info_t inf;
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memset(&inf, 0, sizeof(inf));
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@ -362,6 +377,10 @@ int Create(struct supertype *st, char *mddev, int mdfd,
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if (bitmap_file) {
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int uuid[4];
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if (bitmap_chunk == UnSet)
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bitmap_chunk = DEFAULT_BITMAP_CHUNK;
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st->ss->uuid_from_super(uuid, super);
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if (CreateBitmap(bitmap_file, force, (char*)uuid, bitmap_chunk, delay,
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array.size*2ULL /* FIXME wrong for raid10 */)) {
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18
bitmap.c
18
bitmap.c
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@ -177,10 +177,11 @@ out:
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return info;
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}
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bitmap_info_t *bitmap_file_read(char *filename, int brief)
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bitmap_info_t *bitmap_file_read(char *filename, int brief, struct supertype *st)
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{
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int fd;
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bitmap_info_t *info;
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struct stat stb;
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fd = open(filename, O_RDONLY);
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if (fd < 0) {
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@ -188,13 +189,24 @@ bitmap_info_t *bitmap_file_read(char *filename, int brief)
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filename, strerror(errno));
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return NULL;
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}
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fstat(fd, &stb);
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if ((S_IFMT & stb.st_mode) == S_IFBLK) {
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/* block device, so we are probably after an internal bitmap */
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if (!st) st = guess_super(fd);
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if (!st) {
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/* just look at device... */
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lseek(fd, 0, 0);
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} else {
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st->ss->locate_bitmap(st, fd);
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}
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}
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info = bitmap_fd_read(fd, brief);
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close(fd);
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return info;
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}
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int ExamineBitmap(char *filename, int brief)
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int ExamineBitmap(char *filename, int brief, struct supertype *st)
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{
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/*
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* Read the bitmap file and display its contents
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@ -204,7 +216,7 @@ int ExamineBitmap(char *filename, int brief)
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bitmap_info_t *info;
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int rv = 1;
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info = bitmap_file_read(filename, brief);
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info = bitmap_file_read(filename, brief, st);
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if (!info)
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return rv;
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2
md_p.h
2
md_p.h
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@ -96,6 +96,8 @@ typedef struct mdp_device_descriptor_s {
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#define MD_SB_CLEAN 0
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#define MD_SB_ERRORS 1
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#define MD_SB_BITMAP_PRESENT 8 /* bitmap may be present nearby */
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typedef struct mdp_superblock_s {
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/*
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* Constant generic information
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12
mdadm.c
12
mdadm.c
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@ -698,6 +698,10 @@ int main(int argc, char *argv[])
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fprintf(stderr, Name ": bitmap file needed with -b in --assemble mode\n");
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exit(2);
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}
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if (strcmp(optarg, "internal")==0) {
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fprintf(stderr, Name ": there is no need to specify --bitmap when assembling arrays with internal bitmaps\n");
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continue;
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}
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bitmap_fd = open(optarg, O_RDWR);
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if (!*optarg || bitmap_fd < 0) {
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fprintf(stderr, Name ": cannot open bitmap file %s: %s\n", optarg, strerror(errno));
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@ -863,6 +867,11 @@ int main(int argc, char *argv[])
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if (bitmap_chunk == UnSet) bitmap_chunk = DEFAULT_BITMAP_CHUNK;
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if (delay == 0) delay = DEFAULT_BITMAP_DELAY;
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if (bitmap_file) {
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if (strcmp(bitmap_file, "internal")==0) {
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fprintf(stderr, Name ": 'internal' bitmaps not supported with --build\n");
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rv |= 1;
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break;
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}
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bitmap_fd = open(bitmap_file, O_RDWR,0);
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if (bitmap_fd < 0 && errno != ENOENT) {
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perror(Name ": cannot create bitmap file");
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@ -879,7 +888,6 @@ int main(int argc, char *argv[])
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bitmap_file, bitmap_chunk, delay);
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break;
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case CREATE:
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if (bitmap_chunk == UnSet) bitmap_chunk = DEFAULT_BITMAP_CHUNK;
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if (delay == 0) delay = DEFAULT_BITMAP_DELAY;
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if (ss == NULL) {
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for(i=0; !ss && superlist[i]; i++)
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@ -958,7 +966,7 @@ int main(int argc, char *argv[])
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case 'Q':
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rv |= Query(dv->devname); continue;
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case 'X':
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rv |= ExamineBitmap(dv->devname, brief); continue;
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rv |= ExamineBitmap(dv->devname, brief, ss); continue;
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}
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mdfd = open_mddev(dv->devname, 0);
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if (mdfd>=0) {
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4
mdadm.h
4
mdadm.h
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@ -185,6 +185,8 @@ extern struct superswitch {
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int (*load_super)(struct supertype *st, int fd, void **sbp, char *devname);
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struct supertype * (*match_metadata_desc)(char *arg);
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__u64 (*avail_size)(__u64 size);
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int (*add_internal_bitmap)(void *sbv, int chunk, int delay, unsigned long long size);
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void (*locate_bitmap)(struct supertype *st, int fd);
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int major;
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} super0, super1, *superlist[];
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@ -240,7 +242,7 @@ extern int Kill(char *dev, int force);
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extern int CreateBitmap(char *filename, int force, char uuid[16],
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unsigned long chunksize, unsigned long daemon_sleep,
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unsigned long long array_size);
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extern int ExamineBitmap(char *filename, int brief);
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extern int ExamineBitmap(char *filename, int brief, struct supertype *st);
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extern int md_get_version(int fd);
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extern int get_linux_version(void);
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99
super0.c
99
super0.c
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@ -28,6 +28,7 @@
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*/
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#include "mdadm.h"
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#include <asm/byteorder.h>
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/*
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* All handling for the 0.90.0 version superblock is in
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@ -81,6 +82,8 @@ static void examine_super0(void *sbv)
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printf(" Update Time : %.24s\n", ctime(&atime));
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printf(" State : %s\n",
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(sb->state&(1<<MD_SB_CLEAN))?"clean":"active");
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if (sb->state & (1<<MD_SB_BITMAP_PRESENT))
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printf("Internal Bitmap : present\n");
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printf(" Active Devices : %d\n", sb->active_disks);
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printf("Working Devices : %d\n", sb->working_disks);
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printf(" Failed Devices : %d\n", sb->failed_disks);
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@ -324,10 +327,10 @@ static __u64 event_super0(void *sbv)
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static int init_super0(void **sbp, mdu_array_info_t *info)
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{
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mdp_super_t *sb = malloc(MD_SB_BYTES);
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mdp_super_t *sb = malloc(MD_SB_BYTES + sizeof(bitmap_super_t));
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int spares;
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int rfd;
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memset(sb, 0, MD_SB_BYTES);
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memset(sb, 0, MD_SB_BYTES + sizeof(bitmap_super_t));
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if (info->major_version == -1) {
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/* zeroing the superblock */
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@ -441,6 +444,27 @@ static int write_init_super0(struct supertype *st, void *sbv, mdu_disk_info_t *d
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sb->this_disk = sb->disks[dinfo->number];
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sb->sb_csum = calc_sb0_csum(sb);
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rv = store_super0(fd, sb);
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if (sb->state & (1<<MD_SB_BITMAP_PRESENT)) {
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int towrite, n;
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char buf[4096];
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write(fd, ((char*)sb)+MD_SB_BYTES, sizeof(bitmap_super_t));
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towrite = 64*1024 - MD_SB_BYTES - sizeof(bitmap_super_t);
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memset(buf, 0xff, sizeof(buf));
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while (towrite > 0) {
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n = towrite;
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if (n > sizeof(buf))
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n = sizeof(buf);
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n = write(fd, buf, n);
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if (n > 0)
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towrite -= n;
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else
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break;
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}
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if (towrite)
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rv = -2;
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}
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close(fd);
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if (rv)
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fprintf(stderr, Name ": failed to write superblock to %s\n", devname);
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@ -591,6 +615,75 @@ static __u64 avail_size0(__u64 devsize)
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return MD_NEW_SIZE_SECTORS(devsize);
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}
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static int add_internal_bitmap0(void *sbv, int chunk, int delay, unsigned long long size)
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{
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/*
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* The bitmap comes immediately after the superblock and must be 60K in size
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* at most. The default size is between 30K and 60K
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*
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* size is in K, chunk is in bytes !!!
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*/
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unsigned long long bits = size;
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unsigned long long max_bits = 60*1024*8;
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unsigned long long min_chunk;
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mdp_super_t *sb = sbv;
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bitmap_super_t *bms = (bitmap_super_t*)(((char*)sb) + MD_SB_BYTES);
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min_chunk = 1024;
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while (bits > max_bits) {
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min_chunk *= 2;
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bits = (bits+1)/2;
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}
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if (chunk == UnSet)
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chunk = min_chunk;
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else if (chunk < min_chunk)
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return 0; /* chunk size too small */
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sb->state |= (1<<MD_SB_BITMAP_PRESENT);
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bms->magic = __le32_to_cpu(BITMAP_MAGIC);
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bms->version = __le32_to_cpu(BITMAP_MAJOR);
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uuid_from_super0((int*)bms->uuid, sb);
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bms->chunksize = __le32_to_cpu(chunk);
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bms->daemon_sleep = __le32_to_cpu(delay);
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bms->sync_size = __le64_to_cpu(size);
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return 1;
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}
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void locate_bitmap0(struct supertype *st, int fd)
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{
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unsigned long long dsize;
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unsigned long size;
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unsigned long long offset;
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#ifdef BLKGETSIZE64
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if (ioctl(fd, BLKGETSIZE64, &dsize) != 0)
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#endif
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{
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if (ioctl(fd, BLKGETSIZE, &size))
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return;
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else
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dsize = ((unsigned long long)size)<<9;
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}
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if (dsize < MD_RESERVED_SECTORS*2)
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return;
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offset = MD_NEW_SIZE_SECTORS(dsize>>9);
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offset *= 512;
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offset += MD_SB_BYTES;
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lseek64(fd, offset, 0);
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}
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struct superswitch super0 = {
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.examine_super = examine_super0,
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.brief_examine_super = brief_examine_super0,
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@ -608,5 +701,7 @@ struct superswitch super0 = {
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.load_super = load_super0,
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.match_metadata_desc = match_metadata_desc0,
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.avail_size = avail_size0,
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.add_internal_bitmap = add_internal_bitmap0,
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.locate_bitmap = locate_bitmap0,
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.major = 0,
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};
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