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md: don't return -EAGAIN in md_allow_write for external metadata arrays

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This essentially reverts commit b5470dc5fc ("md: resolve external
metadata handling deadlock in md_allow_write") with some adjustments.

Since commit 6791875e2e ("md: make reconfig_mutex optional for writes
to md sysfs files.") changing array_state to 'active' does not use
mddev_lock() and will not cause a deadlock with md_allow_write(). This
revert simplifies userspace tools that write to sysfs attributes like
"stripe_cache_size" or "consistency_policy" because it removes the need
for special handling for external metadata arrays, checking for EAGAIN
and retrying the write.

Signed-off-by: Artur Paszkiewicz <artur.paszkiewicz@intel.com>
Signed-off-by: Shaohua Li <shli@fb.com>
This commit is contained in:
Artur Paszkiewicz
2017-05-08 11:56:55 +02:00
committed by Shaohua Li
parent 3d05f3aed5
commit 2214c260c7
4 changed files with 15 additions and 28 deletions
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12
drivers/md/raid5.c
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@@ -2309,14 +2309,12 @@ static int resize_stripes(struct r5conf *conf, int newsize)
struct stripe_head *osh, *nsh;
LIST_HEAD(newstripes);
struct disk_info *ndisks;
int err;
int err = 0;
struct kmem_cache *sc;
int i;
int hash, cnt;
err = md_allow_write(conf->mddev);
if (err)
return err;
md_allow_write(conf->mddev);
/* Step 1 */
sc = kmem_cache_create(conf->cache_name[1-conf->active_name],
@@ -6310,7 +6308,6 @@ int
raid5_set_cache_size(struct mddev *mddev, int size)
{
struct r5conf *conf = mddev->private;
int err;
if (size <= 16 || size > 32768)
return -EINVAL;
@@ -6322,10 +6319,7 @@ raid5_set_cache_size(struct mddev *mddev, int size)
;
mutex_unlock(&conf->cache_size_mutex);
err = md_allow_write(mddev);
if (err)
return err;
md_allow_write(mddev);
mutex_lock(&conf->cache_size_mutex);
while (size > conf->max_nr_stripes)