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authorShaohua Li <shli@fb.com>2016-07-30 10:05:31 -0700
committerShaohua Li <shli@fb.com>2016-08-05 22:02:40 -0700
commitd9dd26b20cff88b45d861ec786d86b1c9bd2ee60 (patch)
tree6aa93f54bf5329ad88c0406041b3185511c29680 /drivers/md/bitmap.c
parentff00d3b4e5e4395c825e8ec628f25932d812f31a (diff)
MD: hold mddev lock to change bitmap location
Changing the location changes a lot of things. Holding the lock to avoid race. This makes the .quiesce called with mddev lock hold too. Acked-by: NeilBrown <neilb@suse.com> Signed-off-by: Shaohua Li <shli@fb.com>
Diffstat (limited to 'drivers/md/bitmap.c')
-rw-r--r--drivers/md/bitmap.c47
1 files changed, 33 insertions, 14 deletions
diff --git a/drivers/md/bitmap.c b/drivers/md/bitmap.c
index 6fff794e0c72..13041ee37ad6 100644
--- a/drivers/md/bitmap.c
+++ b/drivers/md/bitmap.c
@@ -2183,19 +2183,29 @@ location_show(struct mddev *mddev, char *page)
static ssize_t
location_store(struct mddev *mddev, const char *buf, size_t len)
{
+ int rv;
+ rv = mddev_lock(mddev);
+ if (rv)
+ return rv;
if (mddev->pers) {
- if (!mddev->pers->quiesce)
- return -EBUSY;
- if (mddev->recovery || mddev->sync_thread)
- return -EBUSY;
+ if (!mddev->pers->quiesce) {
+ rv = -EBUSY;
+ goto out;
+ }
+ if (mddev->recovery || mddev->sync_thread) {
+ rv = -EBUSY;
+ goto out;
+ }
}
if (mddev->bitmap || mddev->bitmap_info.file ||
mddev->bitmap_info.offset) {
/* bitmap already configured. Only option is to clear it */
- if (strncmp(buf, "none", 4) != 0)
- return -EBUSY;
+ if (strncmp(buf, "none", 4) != 0) {
+ rv = -EBUSY;
+ goto out;
+ }
if (mddev->pers) {
mddev->pers->quiesce(mddev, 1);
bitmap_destroy(mddev);
@@ -2214,21 +2224,25 @@ location_store(struct mddev *mddev, const char *buf, size_t len)
/* nothing to be done */;
else if (strncmp(buf, "file:", 5) == 0) {
/* Not supported yet */
- return -EINVAL;
+ rv = -EINVAL;
+ goto out;
} else {
- int rv;
if (buf[0] == '+')
rv = kstrtoll(buf+1, 10, &offset);
else
rv = kstrtoll(buf, 10, &offset);
if (rv)
- return rv;
- if (offset == 0)
- return -EINVAL;
+ goto out;
+ if (offset == 0) {
+ rv = -EINVAL;
+ goto out;
+ }
if (mddev->bitmap_info.external == 0 &&
mddev->major_version == 0 &&
- offset != mddev->bitmap_info.default_offset)
- return -EINVAL;
+ offset != mddev->bitmap_info.default_offset) {
+ rv = -EINVAL;
+ goto out;
+ }
mddev->bitmap_info.offset = offset;
if (mddev->pers) {
struct bitmap *bitmap;
@@ -2245,7 +2259,7 @@ location_store(struct mddev *mddev, const char *buf, size_t len)
mddev->pers->quiesce(mddev, 0);
if (rv) {
bitmap_destroy(mddev);
- return rv;
+ goto out;
}
}
}
@@ -2257,6 +2271,11 @@ location_store(struct mddev *mddev, const char *buf, size_t len)
set_bit(MD_CHANGE_DEVS, &mddev->flags);
md_wakeup_thread(mddev->thread);
}
+ rv = 0;
+out:
+ mddev_unlock(mddev);
+ if (rv)
+ return rv;
return len;
}