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| author | Shaohua Li <shli@fb.com> | 2015-12-20 23:51:02 (GMT) |
|---|---|---|
| committer | NeilBrown <neilb@suse.com> | 2016-01-06 00:39:57 (GMT) |
| commit | f6b6ec5cfac306c1eea66f074050864efcb11851 (patch) | |
| tree | 68c0b7210bb1ce3f23bf59332c47ef35d09cf8eb /drivers/md/dm-io.c | |
| parent | 9ebc6ef188a0656f3620835f9be7fe22c1644c1c (diff) | |
| download | linux-f6b6ec5cfac306c1eea66f074050864efcb11851.tar.xz | |
raid5-cache: add journal hot add/remove support
Add support for journal disk hot add/remove. Mostly trival checks in md
part. The raid5 part is a little tricky. For hot-remove, we can't wait
pending write as it's called from raid5d. The wait will cause deadlock.
We simplily fail the hot-remove. A hot-remove retry can success
eventually since if journal disk is faulty all pending write will be
failed and finish. For hot-add, since an array supporting journal but
without journal disk will be marked read-only, we are safe to hot add
journal without stopping IO (should be read IO, while journal only
handles write IO).
Signed-off-by: Shaohua Li <shli@fb.com>
Signed-off-by: NeilBrown <neilb@suse.com>
Diffstat (limited to 'drivers/md/dm-io.c')
0 files changed, 0 insertions, 0 deletions