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[PATCH] md: Update status_resync to handle LARGE devices 

status_resync - used by /proc/mdstat to report the status of a resync, assumes
that device sizes will always fit into an 'unsigned long' This is no longer
the case...

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 2006-03-27 01:18:04 -08:00 committed by Linus Torvalds
parent 1be7892fff
commit 4588b42e9d
1 changed files with 24 additions and 6 deletions
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30
drivers/md/md.c
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@ -4044,7 +4044,10 @@ static void status_unused(struct seq_file *seq)
static void status_resync(struct seq_file *seq, mddev_t * mddev) static void status_resync(struct seq_file *seq, mddev_t * mddev)
{ {
unsigned long max_blocks, resync, res, dt, db, rt; sector_t max_blocks, resync, res;
unsigned long dt, db, rt;
int scale;
unsigned int per_milli;
resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active))/2; resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active))/2;
@ -4060,9 +4063,22 @@ static void status_resync(struct seq_file *seq, mddev_t * mddev)
MD_BUG(); MD_BUG();
return; return;
} }
res = (resync/1024)*1000/(max_blocks/1024 + 1); /* Pick 'scale' such that (resync>>scale)*1000 will fit
* in a sector_t, and (max_blocks>>scale) will fit in a
* u32, as those are the requirements for sector_div.
* Thus 'scale' must be at least 10
*/
scale = 10;
if (sizeof(sector_t) > sizeof(unsigned long)) {
while ( max_blocks/2 > (1ULL<<(scale+32)))
scale++;
}
res = (resync>>scale)*1000;
sector_div(res, (u32)((max_blocks>>scale)+1));
per_milli = res;
{ {
int i, x = res/50, y = 20-x; int i, x = per_milli/50, y = 20-x;
seq_printf(seq, "["); seq_printf(seq, "[");
for (i = 0; i < x; i++) for (i = 0; i < x; i++)
seq_printf(seq, "="); seq_printf(seq, "=");
@ -4071,10 +4087,12 @@ static void status_resync(struct seq_file *seq, mddev_t * mddev)
seq_printf(seq, "."); seq_printf(seq, ".");
seq_printf(seq, "] "); seq_printf(seq, "] ");
} }
seq_printf(seq, " %s =%3lu.%lu%% (%lu/%lu)", seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
(test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ? (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
"resync" : "recovery"), "resync" : "recovery"),
res/10, res % 10, resync, max_blocks); per_milli/10, per_milli % 10,
(unsigned long long) resync,
(unsigned long long) max_blocks);
/* /*
* We do not want to overflow, so the order of operands and * We do not want to overflow, so the order of operands and
@ -4088,7 +4106,7 @@ static void status_resync(struct seq_file *seq, mddev_t * mddev)
dt = ((jiffies - mddev->resync_mark) / HZ); dt = ((jiffies - mddev->resync_mark) / HZ);
if (!dt) dt++; if (!dt) dt++;
db = resync - (mddev->resync_mark_cnt/2); db = resync - (mddev->resync_mark_cnt/2);
rt = (dt * ((max_blocks-resync) / (db/100+1)))/100; rt = (dt * ((unsigned long)(max_blocks-resync) / (db/100+1)))/100;
seq_printf(seq, " finish=%lu.%lumin", rt / 60, (rt % 60)/6); seq_printf(seq, " finish=%lu.%lumin", rt / 60, (rt % 60)/6);