From: Yu Kuai yukuai3@huawei.com
mainline inclusion from mainline-v6.7-rc1 commit 1b0a2d950ee2a54aa04fb31ead32144be0bbf690 category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I8T02O
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...
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'reconfig_mutex' will be grabbed before these ioctls, suspend array before holding the lock, so that io won't concurrent with array reconfiguration through ioctls.
This is not hot path, so performance is not concerned.
Signed-off-by: Yu Kuai yukuai3@huawei.com Signed-off-by: Song Liu song@kernel.org Link: https://lore.kernel.org/r/20231010151958.145896-13-yukuai1@huaweicloud.com Signed-off-by: Li Nan linan122@huawei.com --- drivers/md/md.c | 30 ++++++++++++++++++++---------- 1 file changed, 20 insertions(+), 10 deletions(-)
diff --git a/drivers/md/md.c b/drivers/md/md.c index 085aa5bd7f05..aba8ce3c661b 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -7210,7 +7210,6 @@ static int set_bitmap_file(struct mddev *mddev, int fd) struct bitmap *bitmap;
bitmap = md_bitmap_create(mddev, -1); - mddev_suspend(mddev); if (!IS_ERR(bitmap)) { mddev->bitmap = bitmap; err = md_bitmap_load(mddev); @@ -7220,11 +7219,8 @@ static int set_bitmap_file(struct mddev *mddev, int fd) md_bitmap_destroy(mddev); fd = -1; } - mddev_resume(mddev); } else if (fd < 0) { - mddev_suspend(mddev); md_bitmap_destroy(mddev); - mddev_resume(mddev); } } if (fd < 0) { @@ -7513,7 +7509,6 @@ static int update_array_info(struct mddev *mddev, mdu_array_info_t *info) mddev->bitmap_info.space = mddev->bitmap_info.default_space; bitmap = md_bitmap_create(mddev, -1); - mddev_suspend(mddev); if (!IS_ERR(bitmap)) { mddev->bitmap = bitmap; rv = md_bitmap_load(mddev); @@ -7521,7 +7516,6 @@ static int update_array_info(struct mddev *mddev, mdu_array_info_t *info) rv = PTR_ERR(bitmap); if (rv) md_bitmap_destroy(mddev); - mddev_resume(mddev); } else { /* remove the bitmap */ if (!mddev->bitmap) { @@ -7546,9 +7540,7 @@ static int update_array_info(struct mddev *mddev, mdu_array_info_t *info) module_put(md_cluster_mod); mddev->safemode_delay = DEFAULT_SAFEMODE_DELAY; } - mddev_suspend(mddev); md_bitmap_destroy(mddev); - mddev_resume(mddev); mddev->bitmap_info.offset = 0; } } @@ -7619,6 +7611,20 @@ static inline bool md_ioctl_valid(unsigned int cmd) } }
+static bool md_ioctl_need_suspend(unsigned int cmd) +{ + switch (cmd) { + case ADD_NEW_DISK: + case HOT_ADD_DISK: + case HOT_REMOVE_DISK: + case SET_BITMAP_FILE: + case SET_ARRAY_INFO: + return true; + default: + return false; + } +} + static int __md_set_array_info(struct mddev *mddev, void __user *argp) { mdu_array_info_t info; @@ -7751,7 +7757,8 @@ static int md_ioctl(struct block_device *bdev, blk_mode_t mode, if (!md_is_rdwr(mddev)) flush_work(&mddev->sync_work);
- err = mddev_lock(mddev); + err = md_ioctl_need_suspend(cmd) ? mddev_suspend_and_lock(mddev) : + mddev_lock(mddev); if (err) { pr_debug("md: ioctl lock interrupted, reason %d, cmd %d\n", err, cmd); @@ -7879,7 +7886,10 @@ static int md_ioctl(struct block_device *bdev, blk_mode_t mode, if (mddev->hold_active == UNTIL_IOCTL && err != -EINVAL) mddev->hold_active = 0; - mddev_unlock(mddev); + + md_ioctl_need_suspend(cmd) ? mddev_unlock_and_resume(mddev) : + mddev_unlock(mddev); + out: if(did_set_md_closing) clear_bit(MD_CLOSING, &mddev->flags);