load_sys(): Add a buffer size argument
This adds a buffer size argument to load_sys(), rather than relying on a hard coded buffer size. The old behavior was safe because we knew the kernel would never return strings overrunning the buffers, however it was ugly, and would cause code checking tools to spit out warnings. This caused a Coverity warning over the read into sra->sysfs_array_state which is only 20 bytes. Reviewed-by: NeilBrown <neilb@suse.com> Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com>
This commit is contained in:
parent
2a1990c0f4
commit
193b6c0b26
2
Detail.c
2
Detail.c
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@ -582,7 +582,7 @@ This is pretty boring
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continue;
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sprintf(path, "/sys/block/%s/md/metadata_version",
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de->d_name);
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if (load_sys(path, vbuf) < 0)
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if (load_sys(path, vbuf, sizeof(vbuf)) < 0)
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continue;
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if (strncmp(vbuf, "external:", 9) != 0 ||
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!is_subarray(vbuf+9) ||
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2
mdadm.h
2
mdadm.h
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@ -631,7 +631,7 @@ extern int sysfs_disk_to_scsi_id(int fd, __u32 *id);
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extern int sysfs_unique_holder(char *devnm, long rdev);
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extern int sysfs_freeze_array(struct mdinfo *sra);
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extern int sysfs_wait(int fd, int *msec);
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extern int load_sys(char *path, char *buf);
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extern int load_sys(char *path, char *buf, int len);
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extern int reshape_prepare_fdlist(char *devname,
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struct mdinfo *sra,
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int raid_disks,
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@ -1654,7 +1654,7 @@ static int ahci_enumerate_ports(const char *hba_path, int port_count, int host_b
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break;
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}
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sprintf(device, "/sys/dev/block/%d:%d/device/type", major, minor);
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if (load_sys(device, buf) != 0) {
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if (load_sys(device, buf, sizeof(buf)) != 0) {
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if (verbose > 0)
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pr_err("failed to read device type for %s\n",
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path);
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@ -1669,7 +1669,7 @@ static int ahci_enumerate_ports(const char *hba_path, int port_count, int host_b
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vendor[0] = '\0';
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model[0] = '\0';
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sprintf(device, "/sys/dev/block/%d:%d/device/vendor", major, minor);
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if (load_sys(device, buf) == 0) {
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if (load_sys(device, buf, sizeof(buf)) == 0) {
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strncpy(vendor, buf, sizeof(vendor));
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vendor[sizeof(vendor) - 1] = '\0';
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c = (char *) &vendor[sizeof(vendor) - 1];
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@ -1678,7 +1678,7 @@ static int ahci_enumerate_ports(const char *hba_path, int port_count, int host_b
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}
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sprintf(device, "/sys/dev/block/%d:%d/device/model", major, minor);
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if (load_sys(device, buf) == 0) {
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if (load_sys(device, buf, sizeof(buf)) == 0) {
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strncpy(model, buf, sizeof(model));
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model[sizeof(model) - 1] = '\0';
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c = (char *) &model[sizeof(model) - 1];
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47
sysfs.c
47
sysfs.c
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@ -27,15 +27,15 @@
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#include <dirent.h>
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#include <ctype.h>
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int load_sys(char *path, char *buf)
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int load_sys(char *path, char *buf, int len)
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{
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int fd = open(path, O_RDONLY);
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int n;
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if (fd < 0)
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return -1;
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n = read(fd, buf, 1024);
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n = read(fd, buf, len);
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close(fd);
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if (n <0 || n >= 1024)
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if (n <0 || n >= len)
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return -1;
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buf[n] = 0;
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if (n && buf[n-1] == '\n')
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@ -118,7 +118,7 @@ struct mdinfo *sysfs_read(int fd, char *devnm, unsigned long options)
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sra->devs = NULL;
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if (options & GET_VERSION) {
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strcpy(base, "metadata_version");
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if (load_sys(fname, buf))
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if (load_sys(fname, buf, sizeof(buf)))
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goto abort;
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if (strncmp(buf, "none", 4) == 0) {
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sra->array.major_version =
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@ -137,31 +137,31 @@ struct mdinfo *sysfs_read(int fd, char *devnm, unsigned long options)
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}
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if (options & GET_LEVEL) {
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strcpy(base, "level");
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if (load_sys(fname, buf))
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if (load_sys(fname, buf, sizeof(buf)))
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goto abort;
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sra->array.level = map_name(pers, buf);
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}
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if (options & GET_LAYOUT) {
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strcpy(base, "layout");
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if (load_sys(fname, buf))
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if (load_sys(fname, buf, sizeof(buf)))
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goto abort;
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sra->array.layout = strtoul(buf, NULL, 0);
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}
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if (options & GET_DISKS) {
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strcpy(base, "raid_disks");
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if (load_sys(fname, buf))
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if (load_sys(fname, buf, sizeof(buf)))
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goto abort;
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sra->array.raid_disks = strtoul(buf, NULL, 0);
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}
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if (options & GET_DEGRADED) {
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strcpy(base, "degraded");
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if (load_sys(fname, buf))
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if (load_sys(fname, buf, sizeof(buf)))
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goto abort;
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sra->array.failed_disks = strtoul(buf, NULL, 0);
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}
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if (options & GET_COMPONENT) {
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strcpy(base, "component_size");
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if (load_sys(fname, buf))
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if (load_sys(fname, buf, sizeof(buf)))
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goto abort;
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sra->component_size = strtoull(buf, NULL, 0);
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/* sysfs reports "K", but we want sectors */
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@ -169,13 +169,13 @@ struct mdinfo *sysfs_read(int fd, char *devnm, unsigned long options)
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}
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if (options & GET_CHUNK) {
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strcpy(base, "chunk_size");
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if (load_sys(fname, buf))
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if (load_sys(fname, buf, sizeof(buf)))
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goto abort;
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sra->array.chunk_size = strtoul(buf, NULL, 0);
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}
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if (options & GET_CACHE) {
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strcpy(base, "stripe_cache_size");
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if (load_sys(fname, buf))
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if (load_sys(fname, buf, sizeof(buf)))
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/* Probably level doesn't support it */
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sra->cache_size = 0;
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else
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@ -183,7 +183,7 @@ struct mdinfo *sysfs_read(int fd, char *devnm, unsigned long options)
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}
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if (options & GET_MISMATCH) {
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strcpy(base, "mismatch_cnt");
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if (load_sys(fname, buf))
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if (load_sys(fname, buf, sizeof(buf)))
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goto abort;
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sra->mismatch_cnt = strtoul(buf, NULL, 0);
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}
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@ -195,7 +195,7 @@ struct mdinfo *sysfs_read(int fd, char *devnm, unsigned long options)
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size_t len;
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strcpy(base, "safe_mode_delay");
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if (load_sys(fname, buf))
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if (load_sys(fname, buf, sizeof(buf)))
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goto abort;
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/* remove a period, and count digits after it */
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@ -218,7 +218,7 @@ struct mdinfo *sysfs_read(int fd, char *devnm, unsigned long options)
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}
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if (options & GET_BITMAP_LOCATION) {
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strcpy(base, "bitmap/location");
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if (load_sys(fname, buf))
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if (load_sys(fname, buf, sizeof(buf)))
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goto abort;
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if (strncmp(buf, "file", 4) == 0)
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sra->bitmap_offset = 1;
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@ -232,7 +232,8 @@ struct mdinfo *sysfs_read(int fd, char *devnm, unsigned long options)
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if (options & GET_ARRAY_STATE) {
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strcpy(base, "array_state");
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if (load_sys(fname, sra->sysfs_array_state))
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if (load_sys(fname, sra->sysfs_array_state,
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sizeof(sra->sysfs_array_state)))
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goto abort;
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} else
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sra->sysfs_array_state[0] = 0;
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@ -262,7 +263,7 @@ struct mdinfo *sysfs_read(int fd, char *devnm, unsigned long options)
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/* Always get slot, major, minor */
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strcpy(dbase, "slot");
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if (load_sys(fname, buf)) {
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if (load_sys(fname, buf, sizeof(buf))) {
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/* hmm... unable to read 'slot' maybe the device
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* is going away?
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*/
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@ -287,7 +288,7 @@ struct mdinfo *sysfs_read(int fd, char *devnm, unsigned long options)
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if (*ep) dev->disk.raid_disk = -1;
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strcpy(dbase, "block/dev");
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if (load_sys(fname, buf)) {
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if (load_sys(fname, buf, sizeof(buf))) {
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/* assume this is a stale reference to a hot
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* removed device
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*/
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@ -299,7 +300,7 @@ struct mdinfo *sysfs_read(int fd, char *devnm, unsigned long options)
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/* special case check for block devices that can go 'offline' */
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strcpy(dbase, "block/device/state");
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if (load_sys(fname, buf) == 0 &&
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if (load_sys(fname, buf, sizeof(buf)) == 0 &&
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strncmp(buf, "offline", 7) == 0) {
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free(dev);
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continue;
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@ -312,25 +313,25 @@ struct mdinfo *sysfs_read(int fd, char *devnm, unsigned long options)
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if (options & GET_OFFSET) {
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strcpy(dbase, "offset");
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if (load_sys(fname, buf))
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if (load_sys(fname, buf, sizeof(buf)))
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goto abort;
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dev->data_offset = strtoull(buf, NULL, 0);
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strcpy(dbase, "new_offset");
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if (load_sys(fname, buf) == 0)
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if (load_sys(fname, buf, sizeof(buf)) == 0)
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dev->new_data_offset = strtoull(buf, NULL, 0);
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else
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dev->new_data_offset = dev->data_offset;
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}
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if (options & GET_SIZE) {
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strcpy(dbase, "size");
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if (load_sys(fname, buf))
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if (load_sys(fname, buf, sizeof(buf)))
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goto abort;
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dev->component_size = strtoull(buf, NULL, 0) * 2;
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}
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if (options & GET_STATE) {
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dev->disk.state = 0;
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strcpy(dbase, "state");
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if (load_sys(fname, buf))
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if (load_sys(fname, buf, sizeof(buf)))
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goto abort;
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if (strstr(buf, "in_sync"))
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dev->disk.state |= (1<<MD_DISK_SYNC);
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}
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if (options & GET_ERROR) {
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strcpy(buf, "errors");
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if (load_sys(fname, buf))
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if (load_sys(fname, buf, sizeof(buf)))
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goto abort;
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dev->errors = strtoul(buf, NULL, 0);
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}
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