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md: don't call bitmap_create() while array is quiesced.

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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>
This commit is contained in:
NeilBrown 2017-10-17 13:46:43 +11:00 committed by Shaohua Li
parent 4d5324f760
commit 52a0d49de3
1 changed files with 10 additions and 6 deletions
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16
drivers/md/md.c
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@ -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);