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[PATCH] md: fix bitmap/read_sb_page so that it handles errors properly.

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read_sb_page() assumed that if sync_page_io fails, the device would be marked
faultly.  However it isn't.  So in the face of error, read_sb_page would loop
forever.

Redo the logic so that this cannot happen.

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>
This commit is contained in:
NeilBrown 2005-09-09 16:23:52 -07:00 • committed by Linus Torvalds
parent 71c0805cb4
commit ab904d6346
1 changed files with 10 additions and 9 deletions
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17
drivers/md/bitmap.c
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@ -270,20 +270,21 @@ static struct page *read_sb_page(mddev_t *mddev, long offset, unsigned long inde
if (!page) if (!page)
return ERR_PTR(-ENOMEM); return ERR_PTR(-ENOMEM);
do {
ITERATE_RDEV(mddev, rdev, tmp)
if (rdev->in_sync && !rdev->faulty)
goto found;
return ERR_PTR(-EIO);
found: ITERATE_RDEV(mddev, rdev, tmp) {
if (! rdev->in_sync || rdev->faulty)
continue;
target = (rdev->sb_offset << 1) + offset + index * (PAGE_SIZE/512); target = (rdev->sb_offset << 1) + offset + index * (PAGE_SIZE/512);
} while (!sync_page_io(rdev->bdev, target, PAGE_SIZE, page, READ)); if (sync_page_io(rdev->bdev, target, PAGE_SIZE, page, READ)) {
page->index = index; page->index = index;
return page; return page;
} }
}
return ERR_PTR(-EIO);
}
static int write_sb_page(mddev_t *mddev, long offset, struct page *page, int wait) static int write_sb_page(mddev_t *mddev, long offset, struct page *page, int wait)
{ {