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[PATCH] md: Factor out part of raid1d into a separate function

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raid1d has toooo many nested block, so take the fix_read_error functionality
out into a separate function.

Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
NeilBrown 2006-10-03 01:15:51 -07:00 committed by Linus Torvalds
parent 2d2063ceae
commit 867868fb55
1 changed files with 95 additions and 78 deletions
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173
drivers/md/raid1.c
View file

@ -1368,6 +1368,95 @@ static void sync_request_write(mddev_t *mddev, r1bio_t *r1_bio)
* 3. Performs writes following reads for array syncronising.
*/
static void fix_read_error(conf_t *conf, int read_disk,
sector_t sect, int sectors)
{
mddev_t *mddev = conf->mddev;
while(sectors) {
int s = sectors;
int d = read_disk;
int success = 0;
int start;
mdk_rdev_t *rdev;
if (s > (PAGE_SIZE>>9))
s = PAGE_SIZE >> 9;
do {
/* Note: no rcu protection needed here
* as this is synchronous in the raid1d thread
* which is the thread that might remove
* a device. If raid1d ever becomes multi-threaded....
*/
rdev = conf->mirrors[d].rdev;
if (rdev &&
test_bit(In_sync, &rdev->flags) &&
sync_page_io(rdev->bdev,
sect + rdev->data_offset,
s<<9,
conf->tmppage, READ))
success = 1;
else {
d++;
if (d == conf->raid_disks)
d = 0;
}
} while (!success && d != read_disk);
if (!success) {
/* Cannot read from anywhere -- bye bye array */
md_error(mddev, conf->mirrors[read_disk].rdev);
break;
}
/* write it back and re-read */
start = d;
while (d != read_disk) {
if (d==0)
d = conf->raid_disks;
d--;
rdev = conf->mirrors[d].rdev;
if (rdev &&
test_bit(In_sync, &rdev->flags)) {
if (sync_page_io(rdev->bdev,
sect + rdev->data_offset,
s<<9, conf->tmppage, WRITE)
== 0)
/* Well, this device is dead */
md_error(mddev, rdev);
}
}
d = start;
while (d != read_disk) {
char b[BDEVNAME_SIZE];
if (d==0)
d = conf->raid_disks;
d--;
rdev = conf->mirrors[d].rdev;
if (rdev &&
test_bit(In_sync, &rdev->flags)) {
if (sync_page_io(rdev->bdev,
sect + rdev->data_offset,
s<<9, conf->tmppage, READ)
== 0)
/* Well, this device is dead */
md_error(mddev, rdev);
else {
atomic_add(s, &rdev->corrected_errors);
printk(KERN_INFO
"raid1:%s: read error corrected "
"(%d sectors at %llu on %s)\n",
mdname(mddev), s,
(unsigned long long)sect +
rdev->data_offset,
bdevname(rdev->bdev, b));
}
}
}
sectors -= s;
sect += s;
}
}
static void raid1d(mddev_t *mddev)
{
r1bio_t *r1_bio;
@ -1460,86 +1549,14 @@ static void raid1d(mddev_t *mddev)
* This is all done synchronously while the array is
* frozen
*/
sector_t sect = r1_bio->sector;
int sectors = r1_bio->sectors;
freeze_array(conf);
if (mddev->ro == 0) while(sectors) {
int s = sectors;
int d = r1_bio->read_disk;
int success = 0;
if (s > (PAGE_SIZE>>9))
s = PAGE_SIZE >> 9;
do {
/* Note: no rcu protection needed here
* as this is synchronous in the raid1d thread
* which is the thread that might remove
* a device. If raid1d ever becomes multi-threaded....
*/
rdev = conf->mirrors[d].rdev;
if (rdev &&
test_bit(In_sync, &rdev->flags) &&
sync_page_io(rdev->bdev,
sect + rdev->data_offset,
s<<9,
conf->tmppage, READ))
success = 1;
else {
d++;
if (d == conf->raid_disks)
d = 0;
}
} while (!success && d != r1_bio->read_disk);
if (success) {
/* write it back and re-read */
int start = d;
while (d != r1_bio->read_disk) {
if (d==0)
d = conf->raid_disks;
d--;
rdev = conf->mirrors[d].rdev;
if (rdev &&
test_bit(In_sync, &rdev->flags)) {
if (sync_page_io(rdev->bdev,
sect + rdev->data_offset,
s<<9, conf->tmppage, WRITE) == 0)
/* Well, this device is dead */
md_error(mddev, rdev);
}
}
d = start;
while (d != r1_bio->read_disk) {
if (d==0)
d = conf->raid_disks;
d--;
rdev = conf->mirrors[d].rdev;
if (rdev &&
test_bit(In_sync, &rdev->flags)) {
if (sync_page_io(rdev->bdev,
sect + rdev->data_offset,
s<<9, conf->tmppage, READ) == 0)
/* Well, this device is dead */
md_error(mddev, rdev);
else {
atomic_add(s, &rdev->corrected_errors);
printk(KERN_INFO "raid1:%s: read error corrected (%d sectors at %llu on %s)\n",
mdname(mddev), s, (unsigned long long)(sect + rdev->data_offset), bdevname(rdev->bdev, b));
}
}
}
} else {
/* Cannot read from anywhere -- bye bye array */
md_error(mddev, conf->mirrors[r1_bio->read_disk].rdev);
break;
}
sectors -= s;
sect += s;
if (mddev->ro == 0) {
freeze_array(conf);
fix_read_error(conf, r1_bio->read_disk,
r1_bio->sector,
r1_bio->sectors);
unfreeze_array(conf);
}
unfreeze_array(conf);
bio = r1_bio->bios[r1_bio->read_disk];
if ((disk=read_balance(conf, r1_bio)) == -1) {
printk(KERN_ALERT "raid1: %s: unrecoverable I/O"