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btrfs: reada: ignore creating reada_extent for a non-existent device 

For a non-existent device, old code bypasses adding it in dev's reada
queue.

And to solve problem of unfinished waitting in raid5/6,
commit 5fbc7c59fd ("Btrfs: fix unfinished readahead thread for
raid5/6 degraded mounting")
adding an exception for the first stripe, in short, the first
stripe will always be processed whether the device exists or not.

Actually we have a better way for the above request: just bypass
creation of the reada_extent for non-existent device, it will make
code simple and effective.

Signed-off-by: Zhao Lei <zhaolei@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Zhao Lei 2016-01-14 18:39:00 +08:00 committed by David Sterba
parent 4fe7a0e138
commit 7aff8cf4a6
1 changed files with 8 additions and 9 deletions
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17
fs/btrfs/reada.c
View File

@ -371,6 +371,11 @@ static struct reada_extent *reada_find_extent(struct btrfs_root *root,
struct reada_zone *zone;
dev = bbio->stripes[nzones].dev;
/* cannot read ahead on missing device. */
if (!dev->bdev)
continue;
zone = reada_find_zone(fs_info, dev, logical, bbio);
if (!zone)
continue;
@ -423,15 +428,9 @@ static struct reada_extent *reada_find_extent(struct btrfs_root *root,
*/
continue;
}
if (!dev->bdev) {
/*
* cannot read ahead on missing device, but for RAID5/6,
* REQ_GET_READ_MIRRORS return 1. So don't skip missing
* device for such case.
*/
if (nzones > 1)
continue;
}
if (!dev->bdev)
continue;
if (dev_replace_is_ongoing &&
dev == fs_info->dev_replace.tgtdev) {
/*