diff options
| author |   Song Liu <songliubraving@fb.com> | 2017-11-19 22:17:01 -0800 |
|---|---|---|
| committer |   Shaohua Li <shli@fb.com> | 2017-12-11 08:52:34 -0800 |
| commit | d5d885fd514fcebc9da5503c88aa0112df7514ef (patch) | |
| tree | 71cf428b0bba2cf5c1afd32b8a32fc3ab5724708 /drivers/md/raid5.c | |
| parent | Linux 4.15-rc3 (diff) | |
| download | linux-dev-d5d885fd514fcebc9da5503c88aa0112df7514ef.tar.xz linux-dev-d5d885fd514fcebc9da5503c88aa0112df7514ef.zip | |
md: introduce new personality funciton start()
In do_md_run(), md threads should not wake up until the array is fully
initialized in md_run(). However, in raid5_run(), raid5-cache may wake
up mddev->thread to flush stripes that need to be written back. This
design doesn't break badly right now. But it could lead to bad bug in
the future.
This patch tries to resolve this problem by splitting start up work
into two personality functions, run() and start(). Tasks that do not
require the md threads should go into run(), while task that require
the md threads go into start().
r5l_load_log() is moved to raid5_start(), so it is not called until
the md threads are started in do_md_run().
Signed-off-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Shaohua Li <shli@fb.com>
Diffstat (limited to 'drivers/md/raid5.c')
| -rw-r--r-- | drivers/md/raid5.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index 98ce4272ace9..5a2a29bd02dd 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -8364,6 +8364,13 @@ static int raid5_change_consistency_policy(struct mddev *mddev, const char *buf) return err; } +static int raid5_start(struct mddev *mddev) +{ + struct r5conf *conf = mddev->private; + + return r5l_start(conf->log); +} + static struct md_personality raid6_personality = { .name = "raid6", @@ -8371,6 +8378,7 @@ static struct md_personality raid6_personality = .owner = THIS_MODULE, .make_request = raid5_make_request, .run = raid5_run, + .start = raid5_start, .free = raid5_free, .status = raid5_status, .error_handler = raid5_error, @@ -8395,6 +8403,7 @@ static struct md_personality raid5_personality = .owner = THIS_MODULE, .make_request = raid5_make_request, .run = raid5_run, + .start = raid5_start, .free = raid5_free, .status = raid5_status, .error_handler = raid5_error, @@ -8420,6 +8429,7 @@ static struct md_personality raid4_personality = .owner = THIS_MODULE, .make_request = raid5_make_request, .run = raid5_run, + .start = raid5_start, .free = raid5_free, .status = raid5_status, .error_handler = raid5_error, |