diff options
| author | NeilBrown <neilb@suse.com> | 2017-10-17 13:46:43 +1100 |
|---|---|---|
| committer | Shaohua Li <shli@fb.com> | 2017-11-01 21:32:18 -0700 |
| commit | 52a0d49de3d592a3118e13f35985e3d99eaf43df (patch) | |
| tree | ae731c4f47a7c913873c7ec87be821b4c9b60291 | |
| parent | 4d5324f760aacaefeb721b172aa14bf66045c332 (diff) | |
md: don't call bitmap_create() while array is quiesced.
bitmap_create() allocates memory with GFP_KERNEL and
so can wait for IO.
If called while the array is quiesced, it could wait indefinitely
for write out to the array - deadlock.
So call bitmap_create() before quiescing the array.
Signed-off-by: NeilBrown <neilb@suse.com>
Signed-off-by: Shaohua Li <shli@fb.com>
| -rw-r--r-- | drivers/md/md.c | 16 |
1 files changed, 10 insertions, 6 deletions
diff --git a/drivers/md/md.c b/drivers/md/md.c index 9767bb33df56..2cb49f639809 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -6621,22 +6621,26 @@ static int set_bitmap_file(struct mddev *mddev, int fd) return -ENOENT; /* cannot remove what isn't there */ err = 0; if (mddev->pers) { - mddev->pers->quiesce(mddev, 1); if (fd >= 0) { struct bitmap *bitmap; bitmap = bitmap_create(mddev, -1); + mddev->pers->quiesce(mddev, 1); if (!IS_ERR(bitmap)) { mddev->bitmap = bitmap; err = bitmap_load(mddev); } else err = PTR_ERR(bitmap); - } - if (fd < 0 || err) { + if (err) { + bitmap_destroy(mddev); + fd = -1; + } + mddev->pers->quiesce(mddev, 0); + } else if (fd < 0) { + mddev->pers->quiesce(mddev, 1); bitmap_destroy(mddev); - fd = -1; /* make sure to put the file */ + mddev->pers->quiesce(mddev, 0); } - mddev->pers->quiesce(mddev, 0); } if (fd < 0) { struct file *f = mddev->bitmap_info.file; @@ -6920,8 +6924,8 @@ static int update_array_info(struct mddev *mddev, mdu_array_info_t *info) mddev->bitmap_info.default_offset; mddev->bitmap_info.space = mddev->bitmap_info.default_space; - mddev->pers->quiesce(mddev, 1); bitmap = bitmap_create(mddev, -1); + mddev->pers->quiesce(mddev, 1); if (!IS_ERR(bitmap)) { mddev->bitmap = bitmap; rv = bitmap_load(mddev); |