Just a few md patches for the 3.15 merge window.
-----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.22 (GNU/Linux) iQIVAwUAU0h5fjnsnt1WYoG5AQKmkw/8DUn0vV4q5UbLp0m2Yy6o6EOxwiSJUH/p 6EEUmSwyXou75w9OWOJKDX2lI7z1yAtzqiuCQ19ekD5lA6gAosja+D0jKjv0SA01 rQm2rMjnwOIxZUIRx/7Z+w/H1ZxjIAc8uxOcCBP6DOynWt/YAyVz1SzLLtwCxELL N9vjgb+4lVt0E9bBYvVRNiJmtVXpDcmn1YySd6Dqyj9t+Mmysnv8QuIStrT3CE7k apss3ew6bBbtbiJHuCno/Q4FDWVAhUH+9GMvksdajw8QW52oHV+RRBB5IpCU6hOx OKCT4MVdzmTgi6GRhSr86Dt+KMOLWZmbx7pK7aRQPiL6uFNhqAlJDb/u0xfaHohG DiRclZBbsHkEpejHaZcJCkyKFHQTEiia3JVk426FAhtiK1qIBuyxEc65RmKf6dsA 1KlZVeclD3wYWKG4hWk/0W3qIPOWBMll+Ely5Zg6s2X3gGy9u5TU+tUsfJaL1aDU NOY+5D0+hg7o21kK7WgTaP2upexC/iaBrVrdlasM2KYXJVDrsfCAQr1/BwTl4qLq Lm/OkIg+WtrQ95RvsI85Hm4PJVxBd1HeyDlKNCcz47kc3Xxqabeq8KnwERyOh4hU U4EmAeCZmSGOOETIWQQxlIn8XdM1+dF4olUH9viEAXrQfGgUyrg6Vcc7BOdTTZCY 8ek3CWG3TwE= =kHl3 -----END PGP SIGNATURE----- Merge tag 'md/3.15' of git://neil.brown.name/md Pull md updates from Neil Brown: "Just a few md patches for the 3.15 merge window. Not much happening in md/raid at the moment. Just a few bug fixes (one for -stable) and a couple of performance tweaks" * tag 'md/3.15' of git://neil.brown.name/md: raid5: get_active_stripe avoids device_lock raid5: make_request does less prepare wait md: avoid oops on unload if some process is in poll or select. md/raid1: r1buf_pool_alloc: free allocate pages when subsequent allocation fails. md/bitmap: don't abuse i_writecount for bitmap files.
This commit is contained in:
Linus Torvalds
commit
7f87307818
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@ -1988,7 +1988,6 @@ location_store(struct mddev *mddev, const char *buf, size_t len)
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if (mddev->bitmap_info.file) {
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struct file *f = mddev->bitmap_info.file;
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mddev->bitmap_info.file = NULL;
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restore_bitmap_write_access(f);
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fput(f);
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}
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} else {
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@ -5181,32 +5181,6 @@ static int restart_array(struct mddev *mddev)
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return 0;
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}
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/* similar to deny_write_access, but accounts for our holding a reference
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* to the file ourselves */
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static int deny_bitmap_write_access(struct file * file)
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{
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struct inode *inode = file->f_mapping->host;
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spin_lock(&inode->i_lock);
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if (atomic_read(&inode->i_writecount) > 1) {
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spin_unlock(&inode->i_lock);
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return -ETXTBSY;
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}
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atomic_set(&inode->i_writecount, -1);
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spin_unlock(&inode->i_lock);
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return 0;
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}
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void restore_bitmap_write_access(struct file *file)
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{
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struct inode *inode = file->f_mapping->host;
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spin_lock(&inode->i_lock);
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atomic_set(&inode->i_writecount, 1);
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spin_unlock(&inode->i_lock);
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}
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static void md_clean(struct mddev *mddev)
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{
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mddev->array_sectors = 0;
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@ -5427,7 +5401,6 @@ static int do_md_stop(struct mddev * mddev, int mode,
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bitmap_destroy(mddev);
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if (mddev->bitmap_info.file) {
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restore_bitmap_write_access(mddev->bitmap_info.file);
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fput(mddev->bitmap_info.file);
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mddev->bitmap_info.file = NULL;
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}
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@ -5979,7 +5952,7 @@ static int hot_add_disk(struct mddev * mddev, dev_t dev)
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static int set_bitmap_file(struct mddev *mddev, int fd)
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{
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int err;
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int err = 0;
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if (mddev->pers) {
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if (!mddev->pers->quiesce)
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@ -5991,6 +5964,7 @@ static int set_bitmap_file(struct mddev *mddev, int fd)
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if (fd >= 0) {
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struct inode *inode;
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if (mddev->bitmap)
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return -EEXIST; /* cannot add when bitmap is present */
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mddev->bitmap_info.file = fget(fd);
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@ -6001,10 +5975,21 @@ static int set_bitmap_file(struct mddev *mddev, int fd)
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return -EBADF;
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}
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err = deny_bitmap_write_access(mddev->bitmap_info.file);
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if (err) {
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inode = mddev->bitmap_info.file->f_mapping->host;
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if (!S_ISREG(inode->i_mode)) {
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printk(KERN_ERR "%s: error: bitmap file must be a regular file\n",
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mdname(mddev));
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err = -EBADF;
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} else if (!(mddev->bitmap_info.file->f_mode & FMODE_WRITE)) {
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printk(KERN_ERR "%s: error: bitmap file must open for write\n",
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mdname(mddev));
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err = -EBADF;
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} else if (atomic_read(&inode->i_writecount) != 1) {
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printk(KERN_ERR "%s: error: bitmap file is already in use\n",
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mdname(mddev));
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err = -EBUSY;
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}
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if (err) {
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fput(mddev->bitmap_info.file);
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mddev->bitmap_info.file = NULL;
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return err;
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@ -6027,10 +6012,8 @@ static int set_bitmap_file(struct mddev *mddev, int fd)
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mddev->pers->quiesce(mddev, 0);
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}
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if (fd < 0) {
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if (mddev->bitmap_info.file) {
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restore_bitmap_write_access(mddev->bitmap_info.file);
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if (mddev->bitmap_info.file)
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fput(mddev->bitmap_info.file);
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}
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mddev->bitmap_info.file = NULL;
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}
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@ -7182,11 +7165,14 @@ static int md_seq_open(struct inode *inode, struct file *file)
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return error;
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}
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static int md_unloading;
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static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
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{
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struct seq_file *seq = filp->private_data;
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int mask;
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if (md_unloading)
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return POLLIN|POLLRDNORM|POLLERR|POLLPRI;;
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poll_wait(filp, &md_event_waiters, wait);
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/* always allow read */
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@ -8672,6 +8658,7 @@ static __exit void md_exit(void)
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{
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struct mddev *mddev;
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struct list_head *tmp;
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int delay = 1;
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blk_unregister_region(MKDEV(MD_MAJOR,0), 1U << MINORBITS);
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blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
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@ -8680,7 +8667,19 @@ static __exit void md_exit(void)
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unregister_blkdev(mdp_major, "mdp");
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unregister_reboot_notifier(&md_notifier);
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unregister_sysctl_table(raid_table_header);
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/* We cannot unload the modules while some process is
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* waiting for us in select() or poll() - wake them up
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*/
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md_unloading = 1;
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while (waitqueue_active(&md_event_waiters)) {
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/* not safe to leave yet */
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wake_up(&md_event_waiters);
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msleep(delay);
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delay += delay;
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}
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remove_proc_entry("mdstat", NULL);
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for_each_mddev(mddev, tmp) {
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export_array(mddev);
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mddev->hold_active = 0;
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@ -605,7 +605,6 @@ extern int md_check_no_bitmap(struct mddev *mddev);
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extern int md_integrity_register(struct mddev *mddev);
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extern void md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev);
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extern int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale);
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extern void restore_bitmap_write_access(struct file *file);
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extern void mddev_init(struct mddev *mddev);
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extern int md_run(struct mddev *mddev);
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@ -97,6 +97,7 @@ static void * r1buf_pool_alloc(gfp_t gfp_flags, void *data)
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struct pool_info *pi = data;
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struct r1bio *r1_bio;
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struct bio *bio;
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int need_pages;
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int i, j;
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r1_bio = r1bio_pool_alloc(gfp_flags, pi);
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@ -119,15 +120,15 @@ static void * r1buf_pool_alloc(gfp_t gfp_flags, void *data)
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* RESYNC_PAGES for each bio.
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*/
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if (test_bit(MD_RECOVERY_REQUESTED, &pi->mddev->recovery))
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j = pi->raid_disks;
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need_pages = pi->raid_disks;
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else
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j = 1;
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while(j--) {
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need_pages = 1;
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for (j = 0; j < need_pages; j++) {
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bio = r1_bio->bios[j];
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bio->bi_vcnt = RESYNC_PAGES;
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if (bio_alloc_pages(bio, gfp_flags))
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goto out_free_bio;
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goto out_free_pages;
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}
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/* If not user-requests, copy the page pointers to all bios */
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if (!test_bit(MD_RECOVERY_REQUESTED, &pi->mddev->recovery)) {
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@ -141,6 +142,14 @@ static void * r1buf_pool_alloc(gfp_t gfp_flags, void *data)
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return r1_bio;
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out_free_pages:
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while (--j >= 0) {
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struct bio_vec *bv;
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bio_for_each_segment_all(bv, r1_bio->bios[j], i)
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__free_page(bv->bv_page);
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}
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out_free_bio:
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while (++j < pi->raid_disks)
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bio_put(r1_bio->bios[j]);
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@ -679,14 +679,9 @@ get_active_stripe(struct r5conf *conf, sector_t sector,
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init_stripe(sh, sector, previous);
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atomic_inc(&sh->count);
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}
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} else {
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} else if (!atomic_inc_not_zero(&sh->count)) {
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spin_lock(&conf->device_lock);
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if (atomic_read(&sh->count)) {
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BUG_ON(!list_empty(&sh->lru)
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&& !test_bit(STRIPE_EXPANDING, &sh->state)
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&& !test_bit(STRIPE_ON_UNPLUG_LIST, &sh->state)
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);
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} else {
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if (!atomic_read(&sh->count)) {
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if (!test_bit(STRIPE_HANDLE, &sh->state))
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atomic_inc(&conf->active_stripes);
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BUG_ON(list_empty(&sh->lru) &&
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@ -4552,6 +4547,8 @@ static void make_request(struct mddev *mddev, struct bio * bi)
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struct stripe_head *sh;
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const int rw = bio_data_dir(bi);
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int remaining;
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DEFINE_WAIT(w);
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bool do_prepare;
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if (unlikely(bi->bi_rw & REQ_FLUSH)) {
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md_flush_request(mddev, bi);
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@ -4575,15 +4572,18 @@ static void make_request(struct mddev *mddev, struct bio * bi)
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bi->bi_next = NULL;
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bi->bi_phys_segments = 1; /* over-loaded to count active stripes */
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prepare_to_wait(&conf->wait_for_overlap, &w, TASK_UNINTERRUPTIBLE);
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for (;logical_sector < last_sector; logical_sector += STRIPE_SECTORS) {
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DEFINE_WAIT(w);
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int previous;
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int seq;
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do_prepare = false;
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retry:
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seq = read_seqcount_begin(&conf->gen_lock);
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previous = 0;
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prepare_to_wait(&conf->wait_for_overlap, &w, TASK_UNINTERRUPTIBLE);
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if (do_prepare)
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prepare_to_wait(&conf->wait_for_overlap, &w,
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TASK_UNINTERRUPTIBLE);
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if (unlikely(conf->reshape_progress != MaxSector)) {
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/* spinlock is needed as reshape_progress may be
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* 64bit on a 32bit platform, and so it might be
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@ -4604,6 +4604,7 @@ static void make_request(struct mddev *mddev, struct bio * bi)
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: logical_sector >= conf->reshape_safe) {
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spin_unlock_irq(&conf->device_lock);
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schedule();
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do_prepare = true;
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goto retry;
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}
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}
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@ -4640,6 +4641,7 @@ static void make_request(struct mddev *mddev, struct bio * bi)
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if (must_retry) {
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release_stripe(sh);
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schedule();
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do_prepare = true;
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goto retry;
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}
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}
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@ -4663,8 +4665,10 @@ static void make_request(struct mddev *mddev, struct bio * bi)
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prepare_to_wait(&conf->wait_for_overlap,
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&w, TASK_INTERRUPTIBLE);
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if (logical_sector >= mddev->suspend_lo &&
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logical_sector < mddev->suspend_hi)
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logical_sector < mddev->suspend_hi) {
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schedule();
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do_prepare = true;
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}
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goto retry;
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}
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@ -4677,9 +4681,9 @@ static void make_request(struct mddev *mddev, struct bio * bi)
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md_wakeup_thread(mddev->thread);
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release_stripe(sh);
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schedule();
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do_prepare = true;
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goto retry;
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}
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finish_wait(&conf->wait_for_overlap, &w);
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set_bit(STRIPE_HANDLE, &sh->state);
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clear_bit(STRIPE_DELAYED, &sh->state);
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if ((bi->bi_rw & REQ_SYNC) &&
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@ -4689,10 +4693,10 @@ static void make_request(struct mddev *mddev, struct bio * bi)
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} else {
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/* cannot get stripe for read-ahead, just give-up */
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clear_bit(BIO_UPTODATE, &bi->bi_flags);
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finish_wait(&conf->wait_for_overlap, &w);
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break;
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}
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}
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finish_wait(&conf->wait_for_overlap, &w);
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remaining = raid5_dec_bi_active_stripes(bi);
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if (remaining == 0) {
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