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| author | Zhao Lei <zhaolei@cn.fujitsu.com> | 2016-01-14 18:39:00 +0800 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2016-02-18 10:27:23 +0100 |
| commit | 7aff8cf4a6d6190e64386f407a7f5cc5f24c60d2 (patch) | |
| tree | 9175c4bc56b6af11db51e1db2e9c6582af4e05a6 /fs/btrfs/reada.c | |
| parent | 4fe7a0e13864238fe5b4cc2640e963581f96429e (diff) | |
| download | blackbird-op-linux-7aff8cf4a6d6190e64386f407a7f5cc5f24c60d2.tar.gz blackbird-op-linux-7aff8cf4a6d6190e64386f407a7f5cc5f24c60d2.zip | |
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 5fbc7c59fd22 ("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>
Diffstat (limited to 'fs/btrfs/reada.c')
| -rw-r--r-- | fs/btrfs/reada.c | 17 |
1 files changed, 8 insertions, 9 deletions
diff --git a/fs/btrfs/reada.c b/fs/btrfs/reada.c index 5bcd567f4827..dd5f361f1a8e 100644 --- a/fs/btrfs/reada.c +++ b/fs/btrfs/reada.c @@ -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) { /* |
