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authorNeilBrown <neilb@cse.unsw.edu.au>2005-06-21 17:17:12 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-06-21 19:07:43 -0700
commit06d91a5fe0b50c9060e70bdf7786f8a3c66249db (patch)
tree95a8b9228534cebb12eb31c1cc9cc0c45f685410 /drivers/md/raid6main.c
parentfca4d848f0e6fafdc2b25f8a0cf1e76935f13ac2 (diff)
downloadop-kernel-dev-06d91a5fe0b50c9060e70bdf7786f8a3c66249db.zip
op-kernel-dev-06d91a5fe0b50c9060e70bdf7786f8a3c66249db.tar.gz
[PATCH] md: improve locking on 'safemode' and move superblock writes
When md marks the superblock dirty before a write, it calls generic_make_request (to write the superblock) from within generic_make_request (to write the first dirty block), which could cause problems later. With this patch, the superblock write is always done by the helper thread, and write request are delayed until that write completes. Also, the locking around marking the array dirty and writing the superblock is improved to avoid possible races. Signed-off-by: Neil Brown <neilb@cse.unsw.edu.au> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers/md/raid6main.c')
-rw-r--r--drivers/md/raid6main.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/md/raid6main.c b/drivers/md/raid6main.c
index 9d0e0e4..fede16c 100644
--- a/drivers/md/raid6main.c
+++ b/drivers/md/raid6main.c
@@ -1570,6 +1570,9 @@ static int make_request (request_queue_t *q, struct bio * bi)
sector_t logical_sector, last_sector;
struct stripe_head *sh;
+ if (md_write_start(mddev, bi)==0)
+ return 0;
+
if (bio_data_dir(bi)==WRITE) {
disk_stat_inc(mddev->gendisk, writes);
disk_stat_add(mddev->gendisk, write_sectors, bio_sectors(bi));
@@ -1583,8 +1586,7 @@ static int make_request (request_queue_t *q, struct bio * bi)
bi->bi_next = NULL;
bi->bi_phys_segments = 1; /* over-loaded to count active stripes */
- if ( bio_data_dir(bi) == WRITE )
- md_write_start(mddev);
+
for (;logical_sector < last_sector; logical_sector += STRIPE_SECTORS) {
DEFINE_WAIT(w);
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