aboutsummaryrefslogtreecommitdiff
path: root/drivers
diff options
context:
space:
mode:
Diffstat (limited to 'drivers')
-rw-r--r--drivers/md/Kconfig16
-rw-r--r--drivers/md/Makefile1
-rw-r--r--drivers/md/bitmap.c189
-rw-r--r--drivers/md/bitmap.h10
-rw-r--r--drivers/md/md-cluster.c965
-rw-r--r--drivers/md/md-cluster.h29
-rw-r--r--drivers/md/md.c382
-rw-r--r--drivers/md/md.h26
-rw-r--r--drivers/md/raid0.c48
-rw-r--r--drivers/md/raid1.c29
-rw-r--r--drivers/md/raid10.c8
-rw-r--r--drivers/md/raid5.c826
-rw-r--r--drivers/md/raid5.h59
13 files changed, 2309 insertions, 279 deletions
diff --git a/drivers/md/Kconfig b/drivers/md/Kconfig
index 6ddc983417d5..edcf4ab66e00 100644
--- a/drivers/md/Kconfig
+++ b/drivers/md/Kconfig
@@ -175,6 +175,22 @@ config MD_FAULTY
In unsure, say N.
+
+config MD_CLUSTER
+ tristate "Cluster Support for MD (EXPERIMENTAL)"
+ depends on BLK_DEV_MD
+ depends on DLM
+ default n
+ ---help---
+ Clustering support for MD devices. This enables locking and
+ synchronization across multiple systems on the cluster, so all
+ nodes in the cluster can access the MD devices simultaneously.
+
+ This brings the redundancy (and uptime) of RAID levels across the
+ nodes of the cluster.
+
+ If unsure, say N.
+
source "drivers/md/bcache/Kconfig"
config BLK_DEV_DM_BUILTIN
diff --git a/drivers/md/Makefile b/drivers/md/Makefile
index 1863feaa5846..dba4db5985fb 100644
--- a/drivers/md/Makefile
+++ b/drivers/md/Makefile
@@ -30,6 +30,7 @@ obj-$(CONFIG_MD_RAID10) += raid10.o
obj-$(CONFIG_MD_RAID456) += raid456.o
obj-$(CONFIG_MD_MULTIPATH) += multipath.o
obj-$(CONFIG_MD_FAULTY) += faulty.o
+obj-$(CONFIG_MD_CLUSTER) += md-cluster.o
obj-$(CONFIG_BCACHE) += bcache/
obj-$(CONFIG_BLK_DEV_MD) += md-mod.o
obj-$(CONFIG_BLK_DEV_DM) += dm-mod.o
diff --git a/drivers/md/bitmap.c b/drivers/md/bitmap.c
index 3a5767968ba0..2bc56e2a3526 100644
--- a/drivers/md/bitmap.c
+++ b/drivers/md/bitmap.c
@@ -205,6 +205,10 @@ static int write_sb_page(struct bitmap *bitmap, struct page *page, int wait)
struct block_device *bdev;
struct mddev *mddev = bitmap->mddev;
struct bitmap_storage *store = &bitmap->storage;
+ int node_offset = 0;
+
+ if (mddev_is_clustered(bitmap->mddev))
+ node_offset = bitmap->cluster_slot * store->file_pages;
while ((rdev = next_active_rdev(rdev, mddev)) != NULL) {
int size = PAGE_SIZE;
@@ -433,6 +437,7 @@ void bitmap_update_sb(struct bitmap *bitmap)
/* This might have been changed by a reshape */
sb->sync_size = cpu_to_le64(bitmap->mddev->resync_max_sectors);
sb->chunksize = cpu_to_le32(bitmap->mddev->bitmap_info.chunksize);
+ sb->nodes = cpu_to_le32(bitmap->mddev->bitmap_info.nodes);
sb->sectors_reserved = cpu_to_le32(bitmap->mddev->
bitmap_info.space);
kunmap_atomic(sb);
@@ -544,6 +549,7 @@ static int bitmap_read_sb(struct bitmap *bitmap)
bitmap_super_t *sb;
unsigned long chunksize, daemon_sleep, write_behind;
unsigned long long events;
+ int nodes = 0;
unsigned long sectors_reserved = 0;
int err = -EINVAL;
struct page *sb_page;
@@ -562,6 +568,22 @@ static int bitmap_read_sb(struct bitmap *bitmap)
return -ENOMEM;
bitmap->storage.sb_page = sb_page;
+re_read:
+ /* If cluster_slot is set, the cluster is setup */
+ if (bitmap->cluster_slot >= 0) {
+ sector_t bm_blocks = bitmap->mddev->resync_max_sectors;
+
+ sector_div(bm_blocks,
+ bitmap->mddev->bitmap_info.chunksize >> 9);
+ /* bits to bytes */
+ bm_blocks = ((bm_blocks+7) >> 3) + sizeof(bitmap_super_t);
+ /* to 4k blocks */
+ bm_blocks = DIV_ROUND_UP_SECTOR_T(bm_blocks, 4096);
+ bitmap->mddev->bitmap_info.offset += bitmap->cluster_slot * (bm_blocks << 3);
+ pr_info("%s:%d bm slot: %d offset: %llu\n", __func__, __LINE__,
+ bitmap->cluster_slot, (unsigned long long)bitmap->mddev->bitmap_info.offset);
+ }
+
if (bitmap->storage.file) {
loff_t isize = i_size_read(bitmap->storage.file->f_mapping->host);
int bytes = isize > PAGE_SIZE ? PAGE_SIZE : isize;
@@ -577,12 +599,15 @@ static int bitmap_read_sb(struct bitmap *bitmap)
if (err)
return err;
+ err = -EINVAL;
sb = kmap_atomic(sb_page);
chunksize = le32_to_cpu(sb->chunksize);
daemon_sleep = le32_to_cpu(sb->daemon_sleep) * HZ;
write_behind = le32_to_cpu(sb->write_behind);
sectors_reserved = le32_to_cpu(sb->sectors_reserved);
+ nodes = le32_to_cpu(sb->nodes);
+ strlcpy(bitmap->mddev->bitmap_info.cluster_name, sb->cluster_name, 64);
/* verify that the bitmap-specific fields are valid */
if (sb->magic != cpu_to_le32(BITMAP_MAGIC))
@@ -619,7 +644,7 @@ static int bitmap_read_sb(struct bitmap *bitmap)
goto out;
}
events = le64_to_cpu(sb->events);
- if (events < bitmap->mddev->events) {
+ if (!nodes && (events < bitmap->mddev->events)) {
printk(KERN_INFO
"%s: bitmap file is out of date (%llu < %llu) "
"-- forcing full recovery\n",
@@ -634,20 +659,40 @@ static int bitmap_read_sb(struct bitmap *bitmap)
if (le32_to_cpu(sb->version) == BITMAP_MAJOR_HOSTENDIAN)
set_bit(BITMAP_HOSTENDIAN, &bitmap->flags);
bitmap->events_cleared = le64_to_cpu(sb->events_cleared);
+ strlcpy(bitmap->mddev->bitmap_info.cluster_name, sb->cluster_name, 64);
err = 0;
+
out:
kunmap_atomic(sb);
+ /* Assiging chunksize is required for "re_read" */
+ bitmap->mddev->bitmap_info.chunksize = chunksize;
+ if (nodes && (bitmap->cluster_slot < 0)) {
+ err = md_setup_cluster(bitmap->mddev, nodes);
+ if (err) {
+ pr_err("%s: Could not setup cluster service (%d)\n",
+ bmname(bitmap), err);
+ goto out_no_sb;
+ }
+ bitmap->cluster_slot = md_cluster_ops->slot_number(bitmap->mddev);
+ goto re_read;
+ }
+
+
out_no_sb:
if (test_bit(BITMAP_STALE, &bitmap->flags))
bitmap->events_cleared = bitmap->mddev->events;
bitmap->mddev->bitmap_info.chunksize = chunksize;
bitmap->mddev->bitmap_info.daemon_sleep = daemon_sleep;
bitmap->mddev->bitmap_info.max_write_behind = write_behind;
+ bitmap->mddev->bitmap_info.nodes = nodes;
if (bitmap->mddev->bitmap_info.space == 0 ||
bitmap->mddev->bitmap_info.space > sectors_reserved)
bitmap->mddev->bitmap_info.space = sectors_reserved;
- if (err)
+ if (err) {
bitmap_print_sb(bitmap);
+ if (bitmap->cluster_slot < 0)
+ md_cluster_stop(bitmap->mddev);
+ }
return err;
}
@@ -692,9 +737,10 @@ static inline struct page *filemap_get_page(struct bitmap_storage *store,
}
static int bitmap_storage_alloc(struct bitmap_storage *store,
- unsigned long chunks, int with_super)
+ unsigned long chunks, int with_super,
+ int slot_number)
{
- int pnum;
+ int pnum, offset = 0;
unsigned long num_pages;
unsigned long bytes;
@@ -703,6 +749,7 @@ static int bitmap_storage_alloc(struct bitmap_storage *store,
bytes += sizeof(bitmap_super_t);
num_pages = DIV_ROUND_UP(bytes, PAGE_SIZE);
+ offset = slot_number * (num_pages - 1);
store->filemap = kmalloc(sizeof(struct page *)
* num_pages, GFP_KERNEL);
@@ -713,20 +760,22 @@ static int bitmap_storage_alloc(struct bitmap_storage *store,
store->sb_page = alloc_page(GFP_KERNEL|__GFP_ZERO);
if (store->sb_page == NULL)
return -ENOMEM;
- store->sb_page->index = 0;
}
+
pnum = 0;
if (store->sb_page) {
store->filemap[0] = store->sb_page;
pnum = 1;
+ store->sb_page->index = offset;
}
+
for ( ; pnum < num_pages; pnum++) {
store->filemap[pnum] = alloc_page(GFP_KERNEL|__GFP_ZERO);
if (!store->filemap[pnum]) {
store->file_pages = pnum;
return -ENOMEM;
}
- store->filemap[pnum]->index = pnum;
+ store->filemap[pnum]->index = pnum + offset;
}
store->file_pages = pnum;
@@ -885,6 +934,28 @@ static void bitmap_file_clear_bit(struct bitmap *bitmap, sector_t block)
}
}
+static int bitmap_file_test_bit(struct bitmap *bitmap, sector_t block)
+{
+ unsigned long bit;
+ struct page *page;
+ void *paddr;
+ unsigned long chunk = block >> bitmap->counts.chunkshift;
+ int set = 0;
+
+ page = filemap_get_page(&bitmap->storage, chunk);
+ if (!page)
+ return -EINVAL;
+ bit = file_page_offset(&bitmap->storage, chunk);
+ paddr = kmap_atomic(page);
+ if (test_bit(BITMAP_HOSTENDIAN, &bitmap->flags))
+ set = test_bit(bit, paddr);
+ else
+ set = test_bit_le(bit, paddr);
+ kunmap_atomic(paddr);
+ return set;
+}
+
+
/* this gets called when the md device is ready to unplug its underlying
* (slave) device queues -- before we let any writes go down, we need to
* sync the dirty pages of the bitmap file to disk */
@@ -935,7 +1006,7 @@ static void bitmap_set_memory_bits(struct bitmap *bitmap, sector_t offset, int n
*/
static int bitmap_init_from_disk(struct bitmap *bitmap, sector_t start)
{
- unsigned long i, chunks, index, oldindex, bit;
+ unsigned long i, chunks, index, oldindex, bit, node_offset = 0;
struct page *page = NULL;
unsigned long bit_cnt = 0;
struct file *file;
@@ -981,6 +1052,9 @@ static int bitmap_init_from_disk(struct bitmap *bitmap, sector_t start)
if (!bitmap->mddev->bitmap_info.external)
offset = sizeof(bitmap_super_t);
+ if (mddev_is_clustered(bitmap->mddev))
+ node_offset = bitmap->cluster_slot * (DIV_ROUND_UP(store->bytes, PAGE_SIZE));
+
for (i = 0; i < chunks; i++) {
int b;
index = file_page_index(&bitmap->storage, i);
@@ -1001,7 +1075,7 @@ static int bitmap_init_from_disk(struct bitmap *bitmap, sector_t start)
bitmap->mddev,
bitmap->mddev->bitmap_info.offset,
page,
- index, count);
+ index + node_offset, count);
if (ret)
goto err;
@@ -1207,7 +1281,6 @@ void bitmap_daemon_work(struct mddev *mddev)
j < bitmap->storage.file_pages
&& !test_bit(BITMAP_STALE, &bitmap->flags);
j++) {
-
if (test_page_attr(bitmap, j,
BITMAP_PAGE_DIRTY))
/* bitmap_unplug will handle the rest */
@@ -1530,11 +1603,13 @@ static void bitmap_set_memory_bits(struct bitmap *bitmap, sector_t offset, int n
return;
}
if (!*bmc) {
- *bmc = 2 | (needed ? NEEDED_MASK : 0);
+ *bmc = 2;
bitmap_count_page(&bitmap->counts, offset, 1);
bitmap_set_pending(&bitmap->counts, offset);
bitmap->allclean = 0;
}
+ if (needed)
+ *bmc |= NEEDED_MASK;
spin_unlock_irq(&bitmap->counts.lock);
}
@@ -1591,6 +1666,10 @@ static void bitmap_free(struct bitmap *bitmap)
if (!bitmap) /* there was no bitmap */
return;
+ if (mddev_is_clustered(bitmap->mddev) && bitmap->mddev->cluster_info &&
+ bitmap->cluster_slot == md_cluster_ops->slot_number(bitmap->mddev))
+ md_cluster_stop(bitmap->mddev);
+
/* Shouldn't be needed - but just in case.... */
wait_event(bitmap->write_wait,
atomic_read(&bitmap->pending_writes) == 0);
@@ -1636,7 +1715,7 @@ void bitmap_destroy(struct mddev *mddev)
* initialize the bitmap structure
* if this returns an error, bitmap_destroy must be called to do clean up
*/
-int bitmap_create(struct mddev *mddev)
+struct bitmap *bitmap_create(struct mddev *mddev, int slot)
{
struct bitmap *bitmap;
sector_t blocks = mddev->resync_max_sectors;
@@ -1650,7 +1729,7 @@ int bitmap_create(struct mddev *mddev)
bitmap = kzalloc(sizeof(*bitmap), GFP_KERNEL);
if (!bitmap)
- return -ENOMEM;
+ return ERR_PTR(-ENOMEM);
spin_lock_init(&bitmap->counts.lock);
atomic_set(&bitmap->pending_writes, 0);
@@ -1659,6 +1738,7 @@ int bitmap_create(struct mddev *mddev)
init_waitqueue_head(&bitmap->behind_wait);
bitmap->mddev = mddev;
+ bitmap->cluster_slot = slot;
if (mddev->kobj.sd)
bm = sysfs_get_dirent(mddev->kobj.sd, "bitmap");
@@ -1706,12 +1786,14 @@ int bitmap_create(struct mddev *mddev)
printk(KERN_INFO "created bitmap (%lu pages) for device %s\n",
bitmap->counts.pages, bmname(bitmap));
- mddev->bitmap = bitmap;
- return test_bit(BITMAP_WRITE_ERROR, &bitmap->flags) ? -EIO : 0;
+ err = test_bit(BITMAP_WRITE_ERROR, &bitmap->flags) ? -EIO : 0;
+ if (err)
+ goto error;
+ return bitmap;
error:
bitmap_free(bitmap);
- return err;
+ return ERR_PTR(err);
}
int bitmap_load(struct mddev *mddev)
@@ -1765,6 +1847,60 @@ out:
}
EXPORT_SYMBOL_GPL(bitmap_load);
+/* Loads the bitmap associated with slot and copies the resync information
+ * to our bitmap
+ */
+int bitmap_copy_from_slot(struct mddev *mddev, int slot,
+ sector_t *low, sector_t *high, bool clear_bits)
+{
+ int rv = 0, i, j;
+ sector_t block, lo = 0, hi = 0;
+ struct bitmap_counts *counts;
+ struct bitmap *bitmap = bitmap_create(mddev, slot);
+
+ if (IS_ERR(bitmap))
+ return PTR_ERR(bitmap);
+
+ rv = bitmap_read_sb(bitmap);
+ if (rv)
+ goto err;
+
+ rv = bitmap_init_from_disk(bitmap, 0);
+ if (rv)
+ goto err;
+
+ counts = &bitmap->counts;
+ for (j = 0; j < counts->chunks; j++) {
+ block = (sector_t)j << counts->chunkshift;
+ if (bitmap_file_test_bit(bitmap, block)) {
+ if (!lo)
+ lo = block;
+ hi = block;
+ bitmap_file_clear_bit(bitmap, block);
+ bitmap_set_memory_bits(mddev->bitmap, block, 1);
+ bitmap_file_set_bit(mddev->bitmap, block);
+ }
+ }
+
+ if (clear_bits) {
+ bitmap_update_sb(bitmap);
+ /* Setting this for the ev_page should be enough.
+ * And we do not require both write_all and PAGE_DIRT either
+ */
+ for (i = 0; i < bitmap->storage.file_pages; i++)
+ set_page_attr(bitmap, i, BITMAP_PAGE_DIRTY);
+ bitmap_write_all(bitmap);
+ bitmap_unplug(bitmap);
+ }
+ *low = lo;
+ *high = hi;
+err:
+ bitmap_free(bitmap);
+ return rv;
+}
+EXPORT_SYMBOL_GPL(bitmap_copy_from_slot);
+
+
void bitmap_status(struct seq_file *seq, struct bitmap *bitmap)
{
unsigned long chunk_kb;
@@ -1849,7 +1985,8 @@ int bitmap_resize(struct bitmap *bitmap, sector_t blocks,
memset(&store, 0, sizeof(store));
if (bitmap->mddev->bitmap_info.offset || bitmap->mddev->bitmap_info.file)
ret = bitmap_storage_alloc(&store, chunks,
- !bitmap->mddev->bitmap_info.external);
+ !bitmap->mddev->bitmap_info.external,
+ bitmap->cluster_slot);
if (ret)
goto err;
@@ -2021,13 +2158,18 @@ location_store(struct mddev *mddev, const char *buf, size_t len)
return -EINVAL;
mddev->bitmap_info.offset = offset;
if (mddev->pers) {
+ struct bitmap *bitmap;
mddev->pers->quiesce(mddev, 1);
- rv = bitmap_create(mddev);
- if (!rv)
+ bitmap = bitmap_create(mddev, -1);
+ if (IS_ERR(bitmap))
+ rv = PTR_ERR(bitmap);
+ else {
+ mddev->bitmap = bitmap;
rv = bitmap_load(mddev);
- if (rv) {
- bitmap_destroy(mddev);
- mddev->bitmap_info.offset = 0;
+ if (rv) {
+ bitmap_destroy(mddev);
+ mddev->bitmap_info.offset = 0;
+ }
}
mddev->pers->quiesce(mddev, 0);
if (rv)
@@ -2186,6 +2328,8 @@ __ATTR(chunksize, S_IRUGO|S_IWUSR, chunksize_show, chunksize_store);
static ssize_t metadata_show(struct mddev *mddev, char *page)
{
+ if (mddev_is_clustered(mddev))
+ return sprintf(page, "clustered\n");
return sprintf(page, "%s\n", (mddev->bitmap_info.external
? "external" : "internal"));
}
@@ -2198,7 +2342,8 @@ static ssize_t metadata_store(struct mddev *mddev, const char *buf, size_t len)
return -EBUSY;
if (strncmp(buf, "external", 8) == 0)
mddev->bitmap_info.external = 1;
- else if (strncmp(buf, "internal", 8) == 0)
+ else if ((strncmp(buf, "internal", 8) == 0) ||
+ (strncmp(buf, "clustered", 9) == 0))
mddev->bitmap_info.external = 0;
else
return -EINVAL;
diff --git a/drivers/md/bitmap.h b/drivers/md/bitmap.h
index 30210b9c4ef9..f1f4dd01090d 100644
--- a/drivers/md/bitmap.h
+++ b/drivers/md/bitmap.h
@@ -130,8 +130,9 @@ typedef struct bitmap_super_s {
__le32 write_behind; /* 60 number of outstanding write-behind writes */
__le32 sectors_reserved; /* 64 number of 512-byte sectors that are
* reserved for the bitmap. */
-
- __u8 pad[256 - 68]; /* set to zero */
+ __le32 nodes; /* 68 the maximum number of nodes in cluster. */
+ __u8 cluster_name[64]; /* 72 cluster name to which this md belongs */
+ __u8 pad[256 - 136]; /* set to zero */
} bitmap_super_t;
/* notes:
@@ -226,12 +227,13 @@ struct bitmap {
wait_queue_head_t behind_wait;
struct kernfs_node *sysfs_can_clear;
+ int cluster_slot; /* Slot offset for clustered env */
};
/* the bitmap API */
/* these are used only by md/bitmap */
-int bitmap_create(struct mddev *mddev);
+struct bitmap *bitmap_create(struct mddev *mddev, int slot);
int bitmap_load(struct mddev *mddev);
void bitmap_flush(struct mddev *mddev);
void bitmap_destroy(struct mddev *mddev);
@@ -260,6 +262,8 @@ void bitmap_daemon_work(struct mddev *mddev);
int bitmap_resize(struct bitmap *bitmap, sector_t blocks,
int chunksize, int init);
+int bitmap_copy_from_slot(struct mddev *mddev, int slot,
+ sector_t *lo, sector_t *hi, bool clear_bits);
#endif
#endif
diff --git a/drivers/md/md-cluster.c b/drivers/md/md-cluster.c
new file mode 100644
index 000000000000..fcfc4b9b2672
--- /dev/null
+++ b/drivers/md/md-cluster.c
@@ -0,0 +1,965 @@
+/*
+ * Copyright (C) 2015, SUSE
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ */
+
+
+#include <linux/module.h>
+#include <linux/dlm.h>
+#include <linux/sched.h>
+#include <linux/raid/md_p.h>
+#include "md.h"
+#include "bitmap.h"
+#include "md-cluster.h"
+
+#define LVB_SIZE 64
+#define NEW_DEV_TIMEOUT 5000
+
+struct dlm_lock_resource {
+ dlm_lockspace_t *ls;
+ struct dlm_lksb lksb;
+ char *name; /* lock name. */
+ uint32_t flags; /* flags to pass to dlm_lock() */
+ struct completion completion; /* completion for synchronized locking */
+ void (*bast)(void *arg, int mode); /* blocking AST function pointer*/
+ struct mddev *mddev; /* pointing back to mddev. */
+};
+
+struct suspend_info {
+ int slot;
+ sector_t lo;
+ sector_t hi;
+ struct list_head list;
+};
+
+struct resync_info {
+ __le64 lo;
+ __le64 hi;
+};
+
+/* md_cluster_info flags */
+#define MD_CLUSTER_WAITING_FOR_NEWDISK 1
+
+
+struct md_cluster_info {
+ /* dlm lock space and resources for clustered raid. */
+ dlm_lockspace_t *lockspace;
+ int slot_number;
+ struct completion completion;
+ struct dlm_lock_resource *sb_lock;
+ struct mutex sb_mutex;
+ struct dlm_lock_resource *bitmap_lockres;
+ struct list_head suspend_list;
+ spinlock_t suspend_lock;
+ struct md_thread *recovery_thread;
+ unsigned long recovery_map;
+ /* communication loc resources */
+ struct dlm_lock_resource *ack_lockres;
+ struct dlm_lock_resource *message_lockres;
+ struct dlm_lock_resource *token_lockres;
+ struct dlm_lock_resource *no_new_dev_lockres;
+ struct md_thread *recv_thread;
+ struct completion newdisk_completion;
+ unsigned long state;
+};
+
+enum msg_type {
+ METADATA_UPDATED = 0,
+ RESYNCING,
+ NEWDISK,
+ REMOVE,
+ RE_ADD,
+};
+
+struct cluster_msg {
+ int type;
+ int slot;
+ /* TODO: Unionize this for smaller footprint */
+ sector_t low;
+ sector_t high;
+ char uuid[16];
+ int raid_slot;
+};
+
+static void sync_ast(void *arg)
+{
+ struct dlm_lock_resource *res;
+
+ res = (struct dlm_lock_resource *) arg;
+ complete(&res->completion);
+}
+
+static int dlm_lock_sync(struct dlm_lock_resource *res, int mode)
+{
+ int ret = 0;
+
+ init_completion(&res->completion);
+ ret = dlm_lock(res->ls, mode, &res->lksb,
+ res->flags, res->name, strlen(res->name),
+ 0, sync_ast, res, res->bast);
+ if (ret)
+ return ret;
+ wait_for_completion(&res->completion);
+ return res->lksb.sb_status;
+}
+
+static int dlm_unlock_sync(struct dlm_lock_resource *res)
+{
+ return dlm_lock_sync(res, DLM_LOCK_NL);
+}
+
+static struct dlm_lock_resource *lockres_init(struct mddev *mddev,
+ char *name, void (*bastfn)(void *arg, int mode), int with_lvb)
+{
+ struct dlm_lock_resource *res = NULL;
+ int ret, namelen;
+ struct md_cluster_info *cinfo = mddev->cluster_info;
+
+ res = kzalloc(sizeof(struct dlm_lock_resource), GFP_KERNEL);
+ if (!res)
+ return NULL;
+ res->ls = cinfo->lockspace;
+ res->mddev = mddev;
+ namelen = strlen(name);
+ res->name = kzalloc(namelen + 1, GFP_KERNEL);
+ if (!res->name) {
+ pr_err("md-cluster: Unable to allocate resource name for resource %s\n", name);
+ goto out_err;
+ }
+ strlcpy(res->name, name, namelen + 1);
+ if (with_lvb) {
+ res->lksb.sb_lvbptr = kzalloc(LVB_SIZE, GFP_KERNEL);
+ if (!res->lksb.sb_lvbptr) {
+ pr_err("md-cluster: Unable to allocate LVB for resource %s\n", name);
+ goto out_err;
+ }
+ res->flags = DLM_LKF_VALBLK;
+ }
+
+ if (bastfn)
+ res->bast = bastfn;
+
+ res->flags |= DLM_LKF_EXPEDITE;
+
+ ret = dlm_lock_sync(res, DLM_LOCK_NL);
+ if (ret) {
+ pr_err("md-cluster: Unable to lock NL on new lock resource %s\n", name);
+ goto out_err;
+ }
+ res->flags &= ~DLM_LKF_EXPEDITE;
+ res->flags |= DLM_LKF_CONVERT;
+
+ return res;
+out_err:
+ kfree(res->lksb.sb_lvbptr);
+ kfree(res->name);
+ kfree(res);
+ return NULL;
+}
+
+static void lockres_free(struct dlm_lock_resource *res)
+{
+ if (!res)
+ return;
+
+ init_completion(&res->completion);
+ dlm_unlock(res->ls, res->lksb.sb_lkid, 0, &res->lksb, res);
+ wait_for_completion(&res->completion);
+
+ kfree(res->name);
+ kfree(res->lksb.sb_lvbptr);
+ kfree(res);
+}
+
+static char *pretty_uuid(char *dest, char *src)
+{
+ int i, len = 0;
+
+ for (i = 0; i < 16; i++) {
+ if (i == 4 || i == 6 || i == 8 || i == 10)
+ len += sprintf(dest + len, "-");
+ len += sprintf(dest + len, "%02x", (__u8)src[i]);
+ }
+ return dest;
+}
+
+static void add_resync_info(struct mddev *mddev, struct dlm_lock_resource *lockres,
+ sector_t lo, sector_t hi)
+{
+ struct resync_info *ri;
+
+ ri = (struct resync_info *)lockres->lksb.sb_lvbptr;
+ ri->lo = cpu_to_le64(lo);
+ ri->hi = cpu_to_le64(hi);
+}
+
+static struct suspend_info *read_resync_info(struct mddev *mddev, struct dlm_lock_resource *lockres)
+{
+ struct resync_info ri;
+ struct suspend_info *s = NULL;
+ sector_t hi = 0;
+
+ dlm_lock_sync(lockres, DLM_LOCK_CR);
+ memcpy(&ri, lockres->lksb.sb_lvbptr, sizeof(struct resync_info));
+ hi = le64_to_cpu(ri.hi);
+ if (ri.hi > 0) {
+ s = kzalloc(sizeof(struct suspend_info), GFP_KERNEL);
+ if (!s)
+ goto out;
+ s->hi = hi;
+ s->lo = le64_to_cpu(ri.lo);
+ }
+ dlm_unlock_sync(lockres);
+out:
+ return s;
+}
+
+static void recover_bitmaps(struct md_thread *thread)
+{
+ struct mddev *mddev = thread->mddev;
+ struct md_cluster_info *cinfo = mddev->cluster_info;
+ struct dlm_lock_resource *bm_lockres;
+ char str[64];
+ int slot, ret;
+ struct suspend_info *s, *tmp;
+ sector_t lo, hi;
+
+ while (cinfo->recovery_map) {
+ slot = fls64((u64)cinfo->recovery_map) - 1;
+
+ /* Clear suspend_area associated with the bitmap */
+ spin_lock_irq(&cinfo->suspend_lock);
+ list_for_each_entry_safe(s, tmp, &cinfo->suspend_list, list)
+ if (slot == s->slot) {
+ list_del(&s->list);
+ kfree(s);
+ }
+ spin_unlock_irq(&cinfo->suspend_lock);
+
+ snprintf(str, 64, "bitmap%04d", slot);
+ bm_lockres = lockres_init(mddev, str, NULL, 1);
+ if (!bm_lockres) {
+ pr_err("md-cluster: Cannot initialize bitmaps\n");
+ goto clear_bit;
+ }
+
+ ret = dlm_lock_sync(bm_lockres, DLM_LOCK_PW);
+ if (ret) {
+ pr_err("md-cluster: Could not DLM lock %s: %d\n",
+ str, ret);
+ goto clear_bit;
+ }
+ ret = bitmap_copy_from_slot(mddev, slot, &lo, &hi, true);
+ if (ret) {
+ pr_err("md-cluster: Could not copy data from bitmap %d\n", slot);
+ goto dlm_unlock;
+ }
+ if (hi > 0) {
+ /* TODO:Wait for current resync to get over */
+ set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
+ if (lo < mddev->recovery_cp)
+ mddev->recovery_cp = lo;
+ md_check_recovery(mddev);
+ }
+dlm_unlock:
+ dlm_unlock_sync(bm_lockres);
+clear_bit:
+ clear_bit(slot, &cinfo->recovery_map);
+ }
+}
+
+static void recover_prep(void *arg)
+{
+}
+
+static void recover_slot(void *arg, struct dlm_slot *slot)
+{
+ struct mddev *mddev = arg;
+ struct md_cluster_info *cinfo = mddev->cluster_info;
+
+ pr_info("md-cluster: %s Node %d/%d down. My slot: %d. Initiating recovery.\n",
+ mddev->bitmap_info.cluster_name,
+ slot->nodeid, slot->slot,
+ cinfo->slot_number);
+ set_bit(slot->slot - 1, &cinfo->recovery_map);
+ if (!cinfo->recovery_thread) {
+ cinfo->recovery_thread = md_register_thread(recover_bitmaps,
+ mddev, "recover");
+ if (!cinfo->recovery_thread) {
+ pr_warn("md-cluster: Could not create recovery thread\n");
+ return;
+ }
+ }
+ md_wakeup_thread(cinfo->recovery_thread);
+}
+
+static void recover_done(void *arg, struct dlm_slot *slots,
+ int num_slots, int our_slot,
+ uint32_t generation)
+{
+ struct mddev *mddev = arg;
+ struct md_cluster_info *cinfo = mddev->cluster_info;
+
+ cinfo->slot_number = our_slot;
+ complete(&cinfo->completion);
+}
+
+static const struct dlm_lockspace_ops md_ls_ops = {
+ .recover_prep = recover_prep,
+ .recover_slot = recover_slot,
+ .recover_done = recover_done,
+};
+
+/*
+ * The BAST function for the ack lock resource
+ * This function wakes up the receive thread in
+ * order to receive and process the message.
+ */
+static void ack_bast(void *arg, int mode)
+{
+ struct dlm_lock_resource *res = (struct dlm_lock_resource *)arg;
+ struct md_cluster_info *cinfo = res->mddev->cluster_info;
+
+ if (mode == DLM_LOCK_EX)
+ md_wakeup_thread(cinfo->recv_thread);
+}
+
+static void __remove_suspend_info(struct md_cluster_info *cinfo, int slot)
+{
+ struct suspend_info *s, *tmp;
+
+ list_for_each_entry_safe(s, tmp, &cinfo->suspend_list, list)
+ if (slot == s->slot) {
+ pr_info("%s:%d Deleting suspend_info: %d\n",
+ __func__, __LINE__, slot);
+ list_del(&s->list);
+ kfree(s);
+ break;
+ }
+}
+
+static void remove_suspend_info(struct md_cluster_info *cinfo, int slot)
+{
+ spin_lock_irq(&cinfo->suspend_lock);
+ __remove_suspend_info(cinfo, slot);
+ spin_unlock_irq(&cinfo->suspend_lock);
+}
+
+
+static void process_suspend_info(struct md_cluster_info *cinfo,
+ int slot, sector_t lo, sector_t hi)
+{
+ struct suspend_info *s;
+
+ if (!hi) {
+ remove_suspend_info(cinfo, slot);
+ return;
+ }
+ s = kzalloc(sizeof(struct suspend_info), GFP_KERNEL);
+ if (!s)
+ return;
+ s->slot = slot;
+ s->lo = lo;
+ s->hi = hi;
+ spin_lock_irq(&cinfo->suspend_lock);
+ /* Remove existing entry (if exists) before adding */
+ __remove_suspend_info(cinfo, slot);
+ list_add(&s->list, &cinfo->suspend_list);
+ spin_unlock_irq(&cinfo->suspend_lock);
+}
+
+static void process_add_new_disk(struct mddev *mddev, struct cluster_msg *cmsg)
+{
+ char disk_uuid[64];
+ struct md_cluster_info *cinfo = mddev->cluster_info;
+ char event_name[] = "EVENT=ADD_DEVICE";
+ char raid_slot[16];
+ char *envp[] = {event_name, disk_uuid, raid_slot, NULL};
+ int len;
+
+ len = snprintf(disk_uuid, 64, "DEVICE_UUID=");
+ pretty_uuid(disk_uuid + len, cmsg->uuid);
+ snprintf(raid_slot, 16, "RAID_DISK=%d", cmsg->raid_slot);
+ pr_info("%s:%d Sending kobject change with %s and %s\n", __func__, __LINE__, disk_uuid, raid_slot);
+ init_completion(&cinfo->newdisk_completion);
+ set_bit(MD_CLUSTER_WAITING_FOR_NEWDISK, &cinfo->state);
+ kobject_uevent_env(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE, envp);
+ wait_for_completion_timeout(&cinfo->newdisk_completion,
+ NEW_DEV_TIMEOUT);
+ clear_bit(MD_CLUSTER_WAITING_FOR_NEWDISK, &cinfo->state);
+}
+
+
+static void process_metadata_update(struct mddev *mddev, struct cluster_msg *msg)
+{
+ struct md_cluster_info *cinfo = mddev->cluster_info;
+
+ md_reload_sb(mddev);
+ dlm_lock_sync(cinfo->no_new_dev_lockres, DLM_LOCK_CR);
+}
+
+static void process_remove_disk(struct mddev *mddev, struct cluster_msg *msg)
+{
+ struct md_rdev *rdev = md_find_rdev_nr_rcu(mddev, msg->raid_slot);
+
+ if (rdev)
+ md_kick_rdev_from_array(rdev);
+ else
+ pr_warn("%s: %d Could not find disk(%d) to REMOVE\n", __func__, __LINE__, msg->raid_slot);
+}
+
+static void process_readd_disk(struct mddev *mddev, struct cluster_msg *msg)
+{
+ struct md_rdev *rdev = md_find_rdev_nr_rcu(mddev, msg->raid_slot);
+
+ if (rdev && test_bit(Faulty, &rdev->flags))
+ clear_bit(Faulty, &rdev->flags);
+ else
+ pr_warn("%s: %d Could not find disk(%d) which is faulty", __func__, __LINE__, msg->raid_slot);
+}
+
+static void process_recvd_msg(struct mddev *mddev, struct cluster_msg *msg)
+{
+ switch (msg->type) {
+ case METADATA_UPDATED:
+ pr_info("%s: %d Received message: METADATA_UPDATE from %d\n",
+ __func__, __LINE__, msg->slot);
+ process_metadata_update(mddev, msg);
+ break;
+ case RESYNCING:
+ pr_info("%s: %d Received message: RESYNCING from %d\n",
+ __func__, __LINE__, msg->slot);
+ process_suspend_info(mddev->cluster_info, msg->slot,
+ msg->low, msg->high);
+ break;
+ case NEWDISK:
+ pr_info("%s: %d Received message: NEWDISK from %d\n",
+ __func__, __LINE__, msg->slot);
+ process_add_new_disk(mddev, msg);
+ break;
+ case REMOVE:
+ pr_info("%s: %d Received REMOVE from %d\n",
+ __func__, __LINE__, msg->slot);
+ process_remove_disk(mddev, msg);
+ break;
+ case RE_ADD:
+ pr_info("%s: %d Received RE_ADD from %d\n",
+ __func__, __LINE__, msg->slot);
+ process_readd_disk(mddev, msg);
+ break;
+ default:
+ pr_warn("%s:%d Received unknown message from %d\n",
+ __func__, __LINE__, msg->slot);
+ }
+}
+
+/*
+ * thread for receiving message
+ */
+static void recv_daemon(struct md_thread *thread)
+{
+ struct md_cluster_info *cinfo = thread->mddev->cluster_info;
+ struct dlm_lock_resource *ack_lockres = cinfo->ack_lockres;
+ struct dlm_lock_resource *message_lockres = cinfo->message_lockres;
+ struct cluster_msg msg;
+
+ /*get CR on Message*/
+ if (dlm_lock_sync(message_lockres, DLM_LOCK_CR)) {
+ pr_err("md/raid1:failed to get CR on MESSAGE\n");
+ return;
+ }
+
+ /* read lvb and wake up thread to process this message_lockres */
+ memcpy(&msg, message_lockres->lksb.sb_lvbptr, sizeof(struct cluster_msg));
+ process_recvd_msg(thread->mddev, &msg);
+
+ /*release CR on ack_lockres*/
+ dlm_unlock_sync(ack_lockres);
+ /*up-convert to EX on message_lockres*/
+ dlm_lock_sync(message_lockres, DLM_LOCK_EX);
+ /*get CR on ack_lockres again*/
+ dlm_lock_sync(ack_lockres, DLM_LOCK_CR);
+ /*release CR on message_lockres*/
+ dlm_unlock_sync(message_lockres);
+}
+
+/* lock_comm()
+ * Takes the lock on the TOKEN lock resource so no other
+ * node can communicate while the operation is underway.
+ */
+static int lock_comm(struct md_cluster_info *cinfo)
+{
+ int error;
+
+ error = dlm_lock_sync(cinfo->token_lockres, DLM_LOCK_EX);
+ if (error)
+ pr_err("md-cluster(%s:%d): failed to get EX on TOKEN (%d)\n",
+ __func__, __LINE__, error);
+ return error;
+}
+
+static void unlock_comm(struct md_cluster_info *cinfo)
+{
+ dlm_unlock_sync(cinfo->token_lockres);
+}
+
+/* __sendmsg()
+ * This function performs the actual sending of the message. This function is
+ * usually called after performing the encompassing operation
+ * The function:
+ * 1. Grabs the message lockresource in EX mode
+ * 2. Copies the message to the message LVB
+ * 3. Downconverts message lockresource to CR
+ * 4. Upconverts ack lock resource from CR to EX. This forces the BAST on other nodes
+ * and the other nodes read the message. The thread will wait here until all other
+ * nodes have released ack lock resource.
+ * 5. Downconvert ack lockresource to CR
+ */
+static int __sendmsg(struct md_cluster_info *cinfo, struct cluster_msg *cmsg)
+{
+ int error;
+ int slot = cinfo->slot_number - 1;
+
+ cmsg->slot = cpu_to_le32(slot);
+ /*get EX on Message*/
+ error = dlm_lock_sync(cinfo->message_lockres, DLM_LOCK_EX);
+ if (error) {
+ pr_err("md-cluster: failed to get EX on MESSAGE (%d)\n", error);
+ goto failed_message;
+ }
+
+ memcpy(cinfo->message_lockres->lksb.sb_lvbptr, (void *)cmsg,
+ sizeof(struct cluster_msg));
+ /*down-convert EX to CR on Message*/
+ error = dlm_lock_sync(cinfo->message_lockres, DLM_LOCK_CR);
+ if (error) {
+ pr_err("md-cluster: failed to convert EX to CR on MESSAGE(%d)\n",
+ error);
+ goto failed_message;
+ }
+
+ /*up-convert CR to EX on Ack*/
+ error = dlm_lock_sync(cinfo->ack_lockres, DLM_LOCK_EX);
+ if (error) {
+ pr_err("md-cluster: failed to convert CR to EX on ACK(%d)\n",
+ error);
+ goto failed_ack;
+ }
+
+ /*down-convert EX to CR on Ack*/
+ error = dlm_lock_sync(cinfo->ack_lockres, DLM_LOCK_CR);
+ if (error) {
+ pr_err("md-cluster: failed to convert EX to CR on ACK(%d)\n",
+ error);
+ goto failed_ack;
+ }
+
+failed_ack:
+ dlm_unlock_sync(cinfo->message_lockres);
+failed_message:
+ return error;
+}
+
+static int sendmsg(struct md_cluster_info *cinfo, struct cluster_msg *cmsg)
+{
+ int ret;
+
+ lock_comm(cinfo);
+ ret = __sendmsg(cinfo, cmsg);
+ unlock_comm(cinfo);
+ return ret;
+}
+
+static int gather_all_resync_info(struct mddev *mddev, int total_slots)
+{
+ struct md_cluster_info *cinfo = mddev->cluster_info;
+ int i, ret = 0;
+ struct dlm_lock_resource *bm_lockres;
+ struct suspend_info *s;
+ char str[64];
+
+
+ for (i = 0; i < total_slots; i++) {
+ memset(str, '\0', 64);
+ snprintf(str, 64, "bitmap%04d", i);
+ bm_lockres = lockres_init(mddev, str, NULL, 1);
+ if (!bm_lockres)
+ return -ENOMEM;
+ if (i == (cinfo->slot_number - 1))
+ continue;
+
+ bm_lockres->flags |= DLM_LKF_NOQUEUE;
+ ret = dlm_lock_sync(bm_lockres, DLM_LOCK_PW);
+ if (ret == -EAGAIN) {
+ memset(bm_lockres->lksb.sb_lvbptr, '\0', LVB_SIZE);
+ s = read_resync_info(mddev, bm_lockres);
+ if (s) {
+ pr_info("%s:%d Resync[%llu..%llu] in progress on %d\n",
+ __func__, __LINE__,
+ (unsigned long long) s->lo,
+ (unsigned long long) s->hi, i);
+ spin_lock_irq(&cinfo->suspend_lock);
+ s->slot = i;
+ list_add(&s->list, &cinfo->suspend_list);
+ spin_unlock_irq(&cinfo->suspend_lock);
+ }
+ ret = 0;
+ lockres_free(bm_lockres);
+ continue;
+ }
+ if (ret)
+ goto out;
+ /* TODO: Read the disk bitmap sb and check if it needs recovery */
+ dlm_unlock_sync(bm_lockres);
+ lockres_free(bm_lockres);
+ }
+out:
+ return ret;
+}
+
+static int join(struct mddev *mddev, int nodes)
+{
+ struct md_cluster_info *cinfo;
+ int ret, ops_rv;
+ char str[64];
+
+ if (!try_module_get(THIS_MODULE))
+ return -ENOENT;
+
+ cinfo = kzalloc(sizeof(struct md_cluster_info), GFP_KERNEL);
+ if (!cinfo)
+ return -ENOMEM;
+
+ init_completion(&cinfo->completion);
+
+ mutex_init(&cinfo->sb_mutex);
+ mddev->cluster_info = cinfo;
+
+ memset(str, 0, 64);
+ pretty_uuid(str, mddev->uuid);
+ ret = dlm_new_lockspace(str, mddev->bitmap_info.cluster_name,
+ DLM_LSFL_FS, LVB_SIZE,
+ &md_ls_ops, mddev, &ops_rv, &cinfo->lockspace);
+ if (ret)
+ goto err;
+ wait_for_completion(&cinfo->completion);
+ if (nodes < cinfo->slot_number) {
+ pr_err("md-cluster: Slot allotted(%d) is greater than available slots(%d).",
+ cinfo->slot_number, nodes);
+ ret = -ERANGE;
+ goto err;
+ }
+ cinfo->sb_lock = lockres_init(mddev, "cmd-super",
+ NULL, 0);
+ if (!cinfo->sb_lock) {
+ ret = -ENOMEM;
+ goto err;
+ }
+ /* Initiate the communication resources */
+ ret = -ENOMEM;
+ cinfo->recv_thread = md_register_thread(recv_daemon, mddev, "cluster_recv");
+ if (!cinfo->recv_thread) {
+ pr_err("md-cluster: cannot allocate memory for recv_thread!\n");
+ goto err;
+ }
+ cinfo->message_lockres = lockres_init(mddev, "message", NULL, 1);
+ if (!cinfo->message_lockres)
+ goto err;
+ cinfo->token_lockres = lockres_init(mddev, "token", NULL, 0);
+ if (!cinfo->token_lockres)
+ goto err;
+ cinfo->ack_lockres = lockres_init(mddev, "ack", ack_bast, 0);
+ if (!cinfo->ack_lockres)
+ goto err;
+ cinfo->no_new_dev_lockres = lockres_init(mddev, "no-new-dev", NULL, 0);
+ if (!cinfo->no_new_dev_lockres)
+ goto err;
+
+ /* get sync CR lock on ACK. */
+ if (dlm_lock_sync(cinfo->ack_lockres, DLM_LOCK_CR))
+ pr_err("md-cluster: failed to get a sync CR lock on ACK!(%d)\n",
+ ret);
+ /* get sync CR lock on no-new-dev. */
+ if (dlm_lock_sync(cinfo->no_new_dev_lockres, DLM_LOCK_CR))
+ pr_err("md-cluster: failed to get a sync CR lock on no-new-dev!(%d)\n", ret);
+
+
+ pr_info("md-cluster: Joined cluster %s slot %d\n", str, cinfo->slot_number);
+ snprintf(str, 64, "bitmap%04d", cinfo->slot_number - 1);
+ cinfo->bitmap_lockres = lockres_init(mddev, str, NULL, 1);
+ if (!cinfo->bitmap_lockres)
+ goto err;
+ if (dlm_lock_sync(cinfo->bitmap_lockres, DLM_LOCK_PW)) {
+ pr_err("Failed to get bitmap lock\n");
+ ret = -EINVAL;
+ goto err;
+ }
+
+ INIT_LIST_HEAD(&cinfo->suspend_list);
+ spin_lock_init(&cinfo->suspend_lock);
+
+ ret = gather_all_resync_info(mddev, nodes);
+ if (ret)
+ goto err;
+
+ return 0;
+err:
+ lockres_free(cinfo->message_lockres);
+ lockres_free(cinfo->token_lockres);
+ lockres_free(cinfo->ack_lockres);
+ lockres_free(cinfo->no_new_dev_lockres);
+ lockres_free(cinfo->bitmap_lockres);
+ lockres_free(cinfo->sb_lock);
+ if (cinfo->lockspace)
+ dlm_release_lockspace(cinfo->lockspace, 2);
+ mddev->cluster_info = NULL;
+ kfree(cinfo);
+ module_put(THIS_MODULE);
+ return ret;
+}
+
+static int leave(struct mddev *mddev)
+{
+ struct md_cluster_info *cinfo = mddev->cluster_info;
+
+ if (!cinfo)
+ return 0;
+ md_unregister_thread(&cinfo->recovery_thread);
+ md_unregister_thread(&cinfo->recv_thread);
+ lockres_free(cinfo->message_lockres);
+ lockres_free(cinfo->token_lockres);
+ lockres_free(cinfo->ack_lockres);
+ lockres_free(cinfo->no_new_dev_lockres);
+ lockres_free(cinfo->sb_lock);
+ lockres_free(cinfo->bitmap_lockres);
+ dlm_release_lockspace(cinfo->lockspace, 2);
+ return 0;
+}
+
+/* slot_number(): Returns the MD slot number to use
+ * DLM starts the slot numbers from 1, wheras cluster-md
+ * wants the number to be from zero, so we deduct one
+ */
+static int slot_number(struct mddev *mddev)
+{
+ struct md_cluster_info *cinfo = mddev->cluster_info;
+
+ return cinfo->slot_number - 1;
+}
+
+static void resync_info_update(struct mddev *mddev, sector_t lo, sector_t hi)
+{
+ struct md_cluster_info *cinfo = mddev->cluster_info;
+
+ add_resync_info(mddev, cinfo->bitmap_lockres, lo, hi);
+ /* Re-acquire the lock to refresh LVB */
+ dlm_lock_sync(cinfo->bitmap_lockres, DLM_LOCK_PW);
+}
+
+static int metadata_update_start(struct mddev *mddev)
+{
+ return lock_comm(mddev->cluster_info);
+}
+
+static int metadata_update_finish(struct mddev *mddev)
+{
+ struct md_cluster_info *cinfo = mddev->cluster_info;
+ struct cluster_msg cmsg;
+ int ret;
+
+ memset(&cmsg, 0, sizeof(cmsg));
+ cmsg.type = cpu_to_le32(METADATA_UPDATED);
+ ret = __sendmsg(cinfo, &cmsg);
+ unlock_comm(cinfo);
+ return ret;
+}
+
+static int metadata_update_cancel(struct mddev *mddev)
+{
+ struct md_cluster_info *cinfo = mddev->cluster_info;
+
+ return dlm_unlock_sync(cinfo->token_lockres);
+}
+
+static int resync_send(struct mddev *mddev, enum msg_type type,
+ sector_t lo, sector_t hi)
+{
+ struct md_cluster_info *cinfo = mddev->cluster_info;
+ struct cluster_msg cmsg;
+ int slot = cinfo->slot_number - 1;
+
+ pr_info("%s:%d lo: %llu hi: %llu\n", __func__, __LINE__,
+ (unsigned long long)lo,
+ (unsigned long long)hi);
+ resync_info_update(mddev, lo, hi);
+ cmsg.type = cpu_to_le32(type);
+ cmsg.slot = cpu_to_le32(slot);
+ cmsg.low = cpu_to_le64(lo);
+ cmsg.high = cpu_to_le64(hi);
+ return sendmsg(cinfo, &cmsg);
+}
+
+static int resync_start(struct mddev *mddev, sector_t lo, sector_t hi)
+{
+ pr_info("%s:%d\n", __func__, __LINE__);
+ return resync_send(mddev, RESYNCING, lo, hi);
+}
+
+static void resync_finish(struct mddev *mddev)
+{
+ pr_info("%s:%d\n", __func__, __LINE__);
+ resync_send(mddev, RESYNCING, 0, 0);
+}
+
+static int area_resyncing(struct mddev *mddev, sector_t lo, sector_t hi)
+{
+ struct md_cluster_info *cinfo = mddev->cluster_info;
+ int ret = 0;
+ struct suspend_info *s;
+
+ spin_lock_irq(&cinfo->suspend_lock);
+ if (list_empty(&cinfo->suspend_list))
+ goto out;
+ list_for_each_entry(s, &cinfo->suspend_list, list)
+ if (hi > s->lo && lo < s->hi) {
+ ret = 1;
+ break;
+ }
+out:
+ spin_unlock_irq(&cinfo->suspend_lock);
+ return ret;
+}
+
+static int add_new_disk_start(struct mddev *mddev, struct md_rdev *rdev)
+{
+ struct md_cluster_info *cinfo = mddev->cluster_info;
+ struct cluster_msg cmsg;
+ int ret = 0;
+ struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
+ char *uuid = sb->device_uuid;
+
+ memset(&cmsg, 0, sizeof(cmsg));
+ cmsg.type = cpu_to_le32(NEWDISK);
+ memcpy(cmsg.uuid, uuid, 16);
+ cmsg.raid_slot = rdev->desc_nr;
+ lock_comm(cinfo);
+ ret = __sendmsg(cinfo, &cmsg);
+ if (ret)
+ return ret;
+ cinfo->no_new_dev_lockres->flags |= DLM_LKF_NOQUEUE;
+ ret = dlm_lock_sync(cinfo->no_new_dev_lockres, DLM_LOCK_EX);
+ cinfo->no_new_dev_lockres->flags &= ~DLM_LKF_NOQUEUE;
+ /* Some node does not "see" the device */
+ if (ret == -EAGAIN)
+ ret = -ENOENT;
+ else
+ dlm_lock_sync(cinfo->no_new_dev_lockres, DLM_LOCK_CR);
+ return ret;
+}
+
+static int add_new_disk_finish(struct mddev *mddev)
+{
+ struct cluster_msg cmsg;
+ struct md_cluster_info *cinfo = mddev->cluster_info;
+ int ret;
+ /* Write sb and inform others */
+ md_update_sb(mddev, 1);
+ cmsg.type = METADATA_UPDATED;
+ ret = __sendmsg(cinfo, &cmsg);
+ unlock_comm(cinfo);
+ return ret;
+}
+
+static int new_disk_ack(struct mddev *mddev, bool ack)
+{
+ struct md_cluster_info *cinfo = mddev->cluster_info;
+
+ if (!test_bit(MD_CLUSTER_WAITING_FOR_NEWDISK, &cinfo->state)) {
+ pr_warn("md-cluster(%s): Spurious cluster confirmation\n", mdname(mddev));
+ return -EINVAL;
+ }
+
+ if (ack)
+ dlm_unlock_sync(cinfo->no_new_dev_lockres);
+ complete(&cinfo->newdisk_completion);
+ return 0;
+}
+
+static int remove_disk(struct mddev *mddev, struct md_rdev *rdev)
+{
+ struct cluster_msg cmsg;
+ struct md_cluster_info *cinfo = mddev->cluster_info;
+ cmsg.type = REMOVE;
+ cmsg.raid_slot = rdev->desc_nr;
+ return __sendmsg(cinfo, &cmsg);
+}
+
+static int gather_bitmaps(struct md_rdev *rdev)
+{
+ int sn, err;
+ sector_t lo, hi;
+ struct cluster_msg cmsg;
+ struct mddev *mddev = rdev->mddev;
+ struct md_cluster_info *cinfo = mddev->cluster_info;
+
+ cmsg.type = RE_ADD;
+ cmsg.raid_slot = rdev->desc_nr;
+ err = sendmsg(cinfo, &cmsg);
+ if (err)
+ goto out;
+
+ for (sn = 0; sn < mddev->bitmap_info.nodes; sn++) {
+ if (sn == (cinfo->slot_number - 1))
+ continue;
+ err = bitmap_copy_from_slot(mddev, sn, &lo, &hi, false);
+ if (err) {
+ pr_warn("md-cluster: Could not gather bitmaps from slot %d", sn);
+ goto out;
+ }
+ if ((hi > 0) && (lo < mddev->recovery_cp))
+ mddev->recovery_cp = lo;
+ }
+out:
+ return err;
+}
+
+static struct md_cluster_operations cluster_ops = {
+ .join = join,
+ .leave = leave,
+ .slot_number = slot_number,
+ .resync_info_update = resync_info_update,
+ .resync_start = resync_start,
+ .resync_finish = resync_finish,
+ .metadata_update_start = metadata_update_start,
+ .metadata_update_finish = metadata_update_finish,
+ .metadata_update_cancel = metadata_update_cancel,
+ .area_resyncing = area_resyncing,
+ .add_new_disk_start = add_new_disk_start,
+ .add_new_disk_finish = add_new_disk_finish,
+ .new_disk_ack = new_disk_ack,
+ .remove_disk = remove_disk,
+ .gather_bitmaps = gather_bitmaps,
+};
+
+static int __init cluster_init(void)
+{
+ pr_warn("md-cluster: EXPERIMENTAL. Use with caution\n");
+ pr_info("Registering Cluster MD functions\n");
+ register_md_cluster_operations(&cluster_ops, THIS_MODULE);
+ return 0;
+}
+
+static void cluster_exit(void)
+{
+ unregister_md_cluster_operations();
+}
+
+module_init(cluster_init);
+module_exit(cluster_exit);
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Clustering support for MD");
diff --git a/drivers/md/md-cluster.h b/drivers/md/md-cluster.h
new file mode 100644
index 000000000000..6817ee00e053
--- /dev/null
+++ b/drivers/md/md-cluster.h
@@ -0,0 +1,29 @@
+
+
+#ifndef _MD_CLUSTER_H
+#define _MD_CLUSTER_H
+
+#include "md.h"
+
+struct mddev;
+struct md_rdev;
+
+struct md_cluster_operations {
+ int (*join)(struct mddev *mddev, int nodes);
+ int (*leave)(struct mddev *mddev);
+ int (*slot_number)(struct mddev *mddev);
+ void (*resync_info_update)(struct mddev *mddev, sector_t lo, sector_t hi);
+ int (*resync_start)(struct mddev *mddev, sector_t lo, sector_t hi);
+ void (*resync_finish)(struct mddev *mddev);
+ int (*metadata_update_start)(struct mddev *mddev);
+ int (*metadata_update_finish)(struct mddev *mddev);
+ int (*metadata_update_cancel)(struct mddev *mddev);
+ int (*area_resyncing)(struct mddev *mddev, sector_t lo, sector_t hi);
+ int (*add_new_disk_start)(struct mddev *mddev, struct md_rdev *rdev);
+ int (*add_new_disk_finish)(struct mddev *mddev);
+ int (*new_disk_ack)(struct mddev *mddev, bool ack);
+ int (*remove_disk)(struct mddev *mddev, struct md_rdev *rdev);
+ int (*gather_bitmaps)(struct md_rdev *rdev);
+};
+
+#endif /* _MD_CLUSTER_H */
diff --git a/drivers/md/md.c b/drivers/md/md.c
index e6178787ce3d..d4f31e195e26 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -53,6 +53,7 @@
#include <linux/slab.h>
#include "md.h"
#include "bitmap.h"
+#include "md-cluster.h"
#ifndef MODULE
static void autostart_arrays(int part);
@@ -66,6 +67,11 @@ static void autostart_arrays(int part);
static LIST_HEAD(pers_list);
static DEFINE_SPINLOCK(pers_lock);
+struct md_cluster_operations *md_cluster_ops;
+EXPORT_SYMBOL(md_cluster_ops);
+struct module *md_cluster_mod;
+EXPORT_SYMBOL(md_cluster_mod);
+
static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
static struct workqueue_struct *md_wq;
static struct workqueue_struct *md_misc_wq;
@@ -640,7 +646,7 @@ void mddev_unlock(struct mddev *mddev)
}
EXPORT_SYMBOL_GPL(mddev_unlock);
-static struct md_rdev *find_rdev_nr_rcu(struct mddev *mddev, int nr)
+struct md_rdev *md_find_rdev_nr_rcu(struct mddev *mddev, int nr)
{
struct md_rdev *rdev;
@@ -650,6 +656,7 @@ static struct md_rdev *find_rdev_nr_rcu(struct mddev *mddev, int nr)
return NULL;
}
+EXPORT_SYMBOL_GPL(md_find_rdev_nr_rcu);
static struct md_rdev *find_rdev(struct mddev *mddev, dev_t dev)
{
@@ -2047,11 +2054,11 @@ static int bind_rdev_to_array(struct md_rdev *rdev, struct mddev *mddev)
int choice = 0;
if (mddev->pers)
choice = mddev->raid_disks;
- while (find_rdev_nr_rcu(mddev, choice))
+ while (md_find_rdev_nr_rcu(mddev, choice))
choice++;
rdev->desc_nr = choice;
} else {
- if (find_rdev_nr_rcu(mddev, rdev->desc_nr)) {
+ if (md_find_rdev_nr_rcu(mddev, rdev->desc_nr)) {
rcu_read_unlock();
return -EBUSY;
}
@@ -2166,11 +2173,12 @@ static void export_rdev(struct md_rdev *rdev)
kobject_put(&rdev->kobj);
}
-static void kick_rdev_from_array(struct md_rdev *rdev)
+void md_kick_rdev_from_array(struct md_rdev *rdev)
{
unbind_rdev_from_array(rdev);
export_rdev(rdev);
}
+EXPORT_SYMBOL_GPL(md_kick_rdev_from_array);
static void export_array(struct mddev *mddev)
{
@@ -2179,7 +2187,7 @@ static void export_array(struct mddev *mddev)
while (!list_empty(&mddev->disks)) {
rdev = list_first_entry(&mddev->disks, struct md_rdev,
same_set);
- kick_rdev_from_array(rdev);
+ md_kick_rdev_from_array(rdev);
}
mddev->raid_disks = 0;
mddev->major_version = 0;
@@ -2208,7 +2216,7 @@ static void sync_sbs(struct mddev *mddev, int nospares)
}
}
-static void md_update_sb(struct mddev *mddev, int force_change)
+void md_update_sb(struct mddev *mddev, int force_change)
{
struct md_rdev *rdev;
int sync_req;
@@ -2369,6 +2377,37 @@ repeat:
wake_up(&rdev->blocked_wait);
}
}
+EXPORT_SYMBOL(md_update_sb);
+
+static int add_bound_rdev(struct md_rdev *rdev)
+{
+ struct mddev *mddev = rdev->mddev;
+ int err = 0;
+
+ if (!mddev->pers->hot_remove_disk) {
+ /* If there is hot_add_disk but no hot_remove_disk
+ * then added disks for geometry changes,
+ * and should be added immediately.
+ */
+ super_types[mddev->major_version].
+ validate_super(mddev, rdev);
+ err = mddev->pers->hot_add_disk(mddev, rdev);
+ if (err) {
+ unbind_rdev_from_array(rdev);
+ export_rdev(rdev);
+ return err;
+ }
+ }
+ sysfs_notify_dirent_safe(rdev->sysfs_state);
+
+ set_bit(MD_CHANGE_DEVS, &mddev->flags);
+ if (mddev->degraded)
+ set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
+ set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
+ md_new_event(mddev);
+ md_wakeup_thread(mddev->thread);
+ return 0;
+}
/* words written to sysfs files may, or may not, be \n terminated.
* We want to accept with case. For this we use cmd_match.
@@ -2471,10 +2510,16 @@ state_store(struct md_rdev *rdev, const char *buf, size_t len)
err = -EBUSY;
else {
struct mddev *mddev = rdev->mddev;
- kick_rdev_from_array(rdev);
+ if (mddev_is_clustered(mddev))
+ md_cluster_ops->remove_disk(mddev, rdev);
+ md_kick_rdev_from_array(rdev);
+ if (mddev_is_clustered(mddev))
+ md_cluster_ops->metadata_update_start(mddev);
if (mddev->pers)
md_update_sb(mddev, 1);
md_new_event(mddev);
+ if (mddev_is_clustered(mddev))
+ md_cluster_ops->metadata_update_finish(mddev);
err = 0;
}
} else if (cmd_match(buf, "writemostly")) {
@@ -2553,6 +2598,21 @@ state_store(struct md_rdev *rdev, const char *buf, size_t len)
clear_bit(Replacement, &rdev->flags);
err = 0;
}
+ } else if (cmd_match(buf, "re-add")) {
+ if (test_bit(Faulty, &rdev->flags) && (rdev->raid_disk == -1)) {
+ /* clear_bit is performed _after_ all the devices
+ * have their local Faulty bit cleared. If any writes
+ * happen in the meantime in the local node, they
+ * will land in the local bitmap, which will be synced
+ * by this node eventually
+ */
+ if (!mddev_is_clustered(rdev->mddev) ||
+ (err = md_cluster_ops->gather_bitmaps(rdev)) == 0) {
+ clear_bit(Faulty, &rdev->flags);
+ err = add_bound_rdev(rdev);
+ }
+ } else
+ err = -EBUSY;
}
if (!err)
sysfs_notify_dirent_safe(rdev->sysfs_state);
@@ -3127,7 +3187,7 @@ static void analyze_sbs(struct mddev *mddev)
"md: fatal superblock inconsistency in %s"
" -- removing from array\n",
bdevname(rdev->bdev,b));
- kick_rdev_from_array(rdev);
+ md_kick_rdev_from_array(rdev);
}
super_types[mddev->major_version].
@@ -3142,18 +3202,27 @@ static void analyze_sbs(struct mddev *mddev)
"md: %s: %s: only %d devices permitted\n",
mdname(mddev), bdevname(rdev->bdev, b),
mddev->max_disks);
- kick_rdev_from_array(rdev);
+ md_kick_rdev_from_array(rdev);
continue;
}
- if (rdev != freshest)
+ if (rdev != freshest) {
if (super_types[mddev->major_version].
validate_super(mddev, rdev)) {
printk(KERN_WARNING "md: kicking non-fresh %s"
" from array!\n",
bdevname(rdev->bdev,b));
- kick_rdev_from_array(rdev);
+ md_kick_rdev_from_array(rdev);
continue;
}
+ /* No device should have a Candidate flag
+ * when reading devices
+ */
+ if (test_bit(Candidate, &rdev->flags)) {
+ pr_info("md: kicking Cluster Candidate %s from array!\n",
+ bdevname(rdev->bdev, b));
+ md_kick_rdev_from_array(rdev);
+ }
+ }
if (mddev->level == LEVEL_MULTIPATH) {
rdev->desc_nr = i++;
rdev->raid_disk = rdev->desc_nr;
@@ -4008,8 +4077,12 @@ size_store(struct mddev *mddev, const char *buf, size_t len)
if (err)
return err;
if (mddev->pers) {
+ if (mddev_is_clustered(mddev))
+ md_cluster_ops->metadata_update_start(mddev);
err = update_size(mddev, sectors);
md_update_sb(mddev, 1);
+ if (mddev_is_clustered(mddev))
+ md_cluster_ops->metadata_update_finish(mddev);
} else {
if (mddev->dev_sectors == 0 ||
mddev->dev_sectors > sectors)
@@ -4354,7 +4427,6 @@ min_sync_store(struct mddev *mddev, const char *buf, size_t len)
{
unsigned long long min;
int err;
- int chunk;
if (kstrtoull(buf, 10, &min))
return -EINVAL;
@@ -4368,16 +4440,8 @@ min_sync_store(struct mddev *mddev, const char *buf, size_t len)
if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
goto out_unlock;
- /* Must be a multiple of chunk_size */
- chunk = mddev->chunk_sectors;
- if (chunk) {
- sector_t temp = min;
-
- err = -EINVAL;
- if (sector_div(temp, chunk))
- goto out_unlock;
- }
- mddev->resync_min = min;
+ /* Round down to multiple of 4K for safety */
+ mddev->resync_min = round_down(min, 8);
err = 0;
out_unlock:
@@ -5077,10 +5141,16 @@ int md_run(struct mddev *mddev)
}
if (err == 0 && pers->sync_request &&
(mddev->bitmap_info.file || mddev->bitmap_info.offset)) {
- err = bitmap_create(mddev);
- if (err)
+ struct bitmap *bitmap;
+
+ bitmap = bitmap_create(mddev, -1);
+ if (IS_ERR(bitmap)) {
+ err = PTR_ERR(bitmap);
printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
mdname(mddev), err);
+ } else
+ mddev->bitmap = bitmap;
+
}
if (err) {
mddev_detach(mddev);
@@ -5232,6 +5302,8 @@ static void md_clean(struct mddev *mddev)
static void __md_stop_writes(struct mddev *mddev)
{
+ if (mddev_is_clustered(mddev))
+ md_cluster_ops->metadata_update_start(mddev);
set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
flush_workqueue(md_misc_wq);
if (mddev->sync_thread) {
@@ -5250,6 +5322,8 @@ static void __md_stop_writes(struct mddev *mddev)
mddev->in_sync = 1;
md_update_sb(mddev, 1);
}
+ if (mddev_is_clustered(mddev))
+ md_cluster_ops->metadata_update_finish(mddev);
}
void md_stop_writes(struct mddev *mddev)
@@ -5636,6 +5710,8 @@ static int get_array_info(struct mddev *mddev, void __user *arg)
info.state = (1<<MD_SB_CLEAN);
if (mddev->bitmap && mddev->bitmap_info.offset)
info.state |= (1<<MD_SB_BITMAP_PRESENT);
+ if (mddev_is_clustered(mddev))
+ info.state |= (1<<MD_SB_CLUSTERED);
info.active_disks = insync;
info.working_disks = working;
info.failed_disks = failed;
@@ -5691,7 +5767,7 @@ static int get_disk_info(struct mddev *mddev, void __user * arg)
return -EFAULT;
rcu_read_lock();
- rdev = find_rdev_nr_rcu(mddev, info.number);
+ rdev = md_find_rdev_nr_rcu(mddev, info.number);
if (rdev) {
info.major = MAJOR(rdev->bdev->bd_dev);
info.minor = MINOR(rdev->bdev->bd_dev);
@@ -5724,6 +5800,13 @@ static int add_new_disk(struct mddev *mddev, mdu_disk_info_t *info)
struct md_rdev *rdev;
dev_t dev = MKDEV(info->major,info->minor);
+ if (mddev_is_clustered(mddev) &&
+ !(info->state & ((1 << MD_DISK_CLUSTER_ADD) | (1 << MD_DISK_CANDIDATE)))) {
+ pr_err("%s: Cannot add to clustered mddev.\n",
+ mdname(mddev));
+ return -EINVAL;
+ }
+
if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
return -EOVERFLOW;
@@ -5810,31 +5893,38 @@ static int add_new_disk(struct mddev *mddev, mdu_disk_info_t *info)
else
clear_bit(WriteMostly, &rdev->flags);
+ /*
+ * check whether the device shows up in other nodes
+ */
+ if (mddev_is_clustered(mddev)) {
+ if (info->state & (1 << MD_DISK_CANDIDATE)) {
+ /* Through --cluster-confirm */
+ set_bit(Candidate, &rdev->flags);
+ err = md_cluster_ops->new_disk_ack(mddev, true);
+ if (err) {
+ export_rdev(rdev);
+ return err;
+ }
+ } else if (info->state & (1 << MD_DISK_CLUSTER_ADD)) {
+ /* --add initiated by this node */
+ err = md_cluster_ops->add_new_disk_start(mddev, rdev);
+ if (err) {
+ md_cluster_ops->add_new_disk_finish(mddev);
+ export_rdev(rdev);
+ return err;
+ }
+ }
+ }
+
rdev->raid_disk = -1;
err = bind_rdev_to_array(rdev, mddev);
- if (!err && !mddev->pers->hot_remove_disk) {
- /* If there is hot_add_disk but no hot_remove_disk
- * then added disks for geometry changes,
- * and should be added immediately.
- */
- super_types[mddev->major_version].
- validate_super(mddev, rdev);
- err = mddev->pers->hot_add_disk(mddev, rdev);
- if (err)
- unbind_rdev_from_array(rdev);
- }
if (err)
export_rdev(rdev);
else
- sysfs_notify_dirent_safe(rdev->sysfs_state);
-
- set_bit(MD_CHANGE_DEVS, &mddev->flags);
- if (mddev->degraded)
- set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
- set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
- if (!err)
- md_new_event(mddev);
- md_wakeup_thread(mddev->thread);
+ err = add_bound_rdev(rdev);
+ if (mddev_is_clustered(mddev) &&
+ (info->state & (1 << MD_DISK_CLUSTER_ADD)))
+ md_cluster_ops->add_new_disk_finish(mddev);
return err;
}
@@ -5895,18 +5985,29 @@ static int hot_remove_disk(struct mddev *mddev, dev_t dev)
if (!rdev)
return -ENXIO;
+ if (mddev_is_clustered(mddev))
+ md_cluster_ops->metadata_update_start(mddev);
+
clear_bit(Blocked, &rdev->flags);
remove_and_add_spares(mddev, rdev);
if (rdev->raid_disk >= 0)
goto busy;
- kick_rdev_from_array(rdev);
+ if (mddev_is_clustered(mddev))
+ md_cluster_ops->remove_disk(mddev, rdev);
+
+ md_kick_rdev_from_array(rdev);
md_update_sb(mddev, 1);
md_new_event(mddev);
+ if (mddev_is_clustered(mddev))
+ md_cluster_ops->metadata_update_finish(mddev);
+
return 0;
busy:
+ if (mddev_is_clustered(mddev))
+ md_cluster_ops->metadata_update_cancel(mddev);
printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n",
bdevname(rdev->bdev,b), mdname(mddev));
return -EBUSY;
@@ -5956,12 +6057,15 @@ static int hot_add_disk(struct mddev *mddev, dev_t dev)
err = -EINVAL;
goto abort_export;
}
+
+ if (mddev_is_clustered(mddev))
+ md_cluster_ops->metadata_update_start(mddev);
clear_bit(In_sync, &rdev->flags);
rdev->desc_nr = -1;
rdev->saved_raid_disk = -1;
err = bind_rdev_to_array(rdev, mddev);
if (err)
- goto abort_export;
+ goto abort_clustered;
/*
* The rest should better be atomic, we can have disk failures
@@ -5972,6 +6076,8 @@ static int hot_add_disk(struct mddev *mddev, dev_t dev)
md_update_sb(mddev, 1);
+ if (mddev_is_clustered(mddev))
+ md_cluster_ops->metadata_update_finish(mddev);
/*
* Kick recovery, maybe this spare has to be added to the
* array immediately.
@@ -5981,6 +6087,9 @@ static int hot_add_disk(struct mddev *mddev, dev_t dev)
md_new_event(mddev);
return 0;
+abort_clustered:
+ if (mddev_is_clustered(mddev))
+ md_cluster_ops->metadata_update_cancel(mddev);
abort_export:
export_rdev(rdev);
return err;
@@ -6038,9 +6147,14 @@ static int set_bitmap_file(struct mddev *mddev, int fd)
if (mddev->pers) {
mddev->pers->quiesce(mddev, 1);
if (fd >= 0) {
- err = bitmap_create(mddev);
- if (!err)
+ struct bitmap *bitmap;
+
+ bitmap = bitmap_create(mddev, -1);
+ if (!IS_ERR(bitmap)) {
+ mddev->bitmap = bitmap;
err = bitmap_load(mddev);
+ } else
+ err = PTR_ERR(bitmap);
}
if (fd < 0 || err) {
bitmap_destroy(mddev);
@@ -6293,6 +6407,8 @@ static int update_array_info(struct mddev *mddev, mdu_array_info_t *info)
return rv;
}
}
+ if (mddev_is_clustered(mddev))
+ md_cluster_ops->metadata_update_start(mddev);
if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
rv = update_size(mddev, (sector_t)info->size * 2);
@@ -6300,33 +6416,49 @@ static int update_array_info(struct mddev *mddev, mdu_array_info_t *info)
rv = update_raid_disks(mddev, info->raid_disks);
if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
- if (mddev->pers->quiesce == NULL || mddev->thread == NULL)
- return -EINVAL;
- if (mddev->recovery || mddev->sync_thread)
- return -EBUSY;
+ if (mddev->pers->quiesce == NULL || mddev->thread == NULL) {
+ rv = -EINVAL;
+ goto err;
+ }
+ if (mddev->recovery || mddev->sync_thread) {
+ rv = -EBUSY;
+ goto err;
+ }
if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
+ struct bitmap *bitmap;
/* add the bitmap */
- if (mddev->bitmap)
- return -EEXIST;
- if (mddev->bitmap_info.default_offset == 0)
- return -EINVAL;
+ if (mddev->bitmap) {
+ rv = -EEXIST;
+ goto err;
+ }
+ if (mddev->bitmap_info.default_offset == 0) {
+ rv = -EINVAL;
+ goto err;
+ }
mddev->bitmap_info.offset =
mddev->bitmap_info.default_offset;
mddev->bitmap_info.space =
mddev->bitmap_info.default_space;
mddev->pers->quiesce(mddev, 1);
- rv = bitmap_create(mddev);
- if (!rv)
+ bitmap = bitmap_create(mddev, -1);
+ if (!IS_ERR(bitmap)) {
+ mddev->bitmap = bitmap;
rv = bitmap_load(mddev);
+ } else
+ rv = PTR_ERR(bitmap);
if (rv)
bitmap_destroy(mddev);
mddev->pers->quiesce(mddev, 0);
} else {
/* remove the bitmap */
- if (!mddev->bitmap)
- return -ENOENT;
- if (mddev->bitmap->storage.file)
- return -EINVAL;
+ if (!mddev->bitmap) {
+ rv = -ENOENT;
+ goto err;
+ }
+ if (mddev->bitmap->storage.file) {
+ rv = -EINVAL;
+ goto err;
+ }
mddev->pers->quiesce(mddev, 1);
bitmap_destroy(mddev);
mddev->pers->quiesce(mddev, 0);
@@ -6334,6 +6466,12 @@ static int update_array_info(struct mddev *mddev, mdu_array_info_t *info)
}
}
md_update_sb(mddev, 1);
+ if (mddev_is_clustered(mddev))
+ md_cluster_ops->metadata_update_finish(mddev);
+ return rv;
+err:
+ if (mddev_is_clustered(mddev))
+ md_cluster_ops->metadata_update_cancel(mddev);
return rv;
}
@@ -6393,6 +6531,7 @@ static inline bool md_ioctl_valid(unsigned int cmd)
case SET_DISK_FAULTY:
case STOP_ARRAY:
case STOP_ARRAY_RO:
+ case CLUSTERED_DISK_NACK:
return true;
default:
return false;
@@ -6665,6 +6804,13 @@ static int md_ioctl(struct block_device *bdev, fmode_t mode,
goto unlock;
}
+ case CLUSTERED_DISK_NACK:
+ if (mddev_is_clustered(mddev))
+ md_cluster_ops->new_disk_ack(mddev, false);
+ else
+ err = -EINVAL;
+ goto unlock;
+
case HOT_ADD_DISK:
err = hot_add_disk(mddev, new_decode_dev(arg));
goto unlock;
@@ -7238,6 +7384,55 @@ int unregister_md_personality(struct md_personality *p)
}
EXPORT_SYMBOL(unregister_md_personality);
+int register_md_cluster_operations(struct md_cluster_operations *ops, struct module *module)
+{
+ if (md_cluster_ops != NULL)
+ return -EALREADY;
+ spin_lock(&pers_lock);
+ md_cluster_ops = ops;
+ md_cluster_mod = module;
+ spin_unlock(&pers_lock);
+ return 0;
+}
+EXPORT_SYMBOL(register_md_cluster_operations);
+
+int unregister_md_cluster_operations(void)
+{
+ spin_lock(&pers_lock);
+ md_cluster_ops = NULL;
+ spin_unlock(&pers_lock);
+ return 0;
+}
+EXPORT_SYMBOL(unregister_md_cluster_operations);
+
+int md_setup_cluster(struct mddev *mddev, int nodes)
+{
+ int err;
+
+ err = request_module("md-cluster");
+ if (err) {
+ pr_err("md-cluster module not found.\n");
+ return err;
+ }
+
+ spin_lock(&pers_lock);
+ if (!md_cluster_ops || !try_module_get(md_cluster_mod)) {
+ spin_unlock(&pers_lock);
+ return -ENOENT;
+ }
+ spin_unlock(&pers_lock);
+
+ return md_cluster_ops->join(mddev, nodes);
+}
+
+void md_cluster_stop(struct mddev *mddev)
+{
+ if (!md_cluster_ops)
+ return;
+ md_cluster_ops->leave(mddev);
+ module_put(md_cluster_mod);
+}
+
static int is_mddev_idle(struct mddev *mddev, int init)
{
struct md_rdev *rdev;
@@ -7375,7 +7570,11 @@ int md_allow_write(struct mddev *mddev)
mddev->safemode == 0)
mddev->safemode = 1;
spin_unlock(&mddev->lock);
+ if (mddev_is_clustered(mddev))
+ md_cluster_ops->metadata_update_start(mddev);
md_update_sb(mddev, 0);
+ if (mddev_is_clustered(mddev))
+ md_cluster_ops->metadata_update_finish(mddev);
sysfs_notify_dirent_safe(mddev->sysfs_state);
} else
spin_unlock(&mddev->lock);
@@ -7576,6 +7775,9 @@ void md_do_sync(struct md_thread *thread)
md_new_event(mddev);
update_time = jiffies;
+ if (mddev_is_clustered(mddev))
+ md_cluster_ops->resync_start(mddev, j, max_sectors);
+
blk_start_plug(&plug);
while (j < max_sectors) {
sector_t sectors;
@@ -7618,8 +7820,7 @@ void md_do_sync(struct md_thread *thread)
if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
break;
- sectors = mddev->pers->sync_request(mddev, j, &skipped,
- currspeed < speed_min(mddev));
+ sectors = mddev->pers->sync_request(mddev, j, &skipped);
if (sectors == 0) {
set_bit(MD_RECOVERY_INTR, &mddev->recovery);
break;
@@ -7636,6 +7837,8 @@ void md_do_sync(struct md_thread *thread)
j += sectors;
if (j > 2)
mddev->curr_resync = j;
+ if (mddev_is_clustered(mddev))
+ md_cluster_ops->resync_info_update(mddev, j, max_sectors);
mddev->curr_mark_cnt = io_sectors;
if (last_check == 0)
/* this is the earliest that rebuild will be
@@ -7677,11 +7880,18 @@ void md_do_sync(struct md_thread *thread)
/((jiffies-mddev->resync_mark)/HZ +1) +1;
if (currspeed > speed_min(mddev)) {
- if ((currspeed > speed_max(mddev)) ||
- !is_mddev_idle(mddev, 0)) {
+ if (currspeed > speed_max(mddev)) {
msleep(500);
goto repeat;
}
+ if (!is_mddev_idle(mddev, 0)) {
+ /*
+ * Give other IO more of a chance.
+ * The faster the devices, the less we wait.
+ */
+ wait_event(mddev->recovery_wait,
+ !atomic_read(&mddev->recovery_active));
+ }
}
}
printk(KERN_INFO "md: %s: %s %s.\n",mdname(mddev), desc,
@@ -7694,7 +7904,10 @@ void md_do_sync(struct md_thread *thread)
wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
/* tell personality that we are finished */
- mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
+ mddev->pers->sync_request(mddev, max_sectors, &skipped);
+
+ if (mddev_is_clustered(mddev))
+ md_cluster_ops->resync_finish(mddev);
if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
mddev->curr_resync > 2) {
@@ -7925,8 +8138,13 @@ void md_check_recovery(struct mddev *mddev)
sysfs_notify_dirent_safe(mddev->sysfs_state);
}
- if (mddev->flags & MD_UPDATE_SB_FLAGS)
+ if (mddev->flags & MD_UPDATE_SB_FLAGS) {
+ if (mddev_is_clustered(mddev))
+ md_cluster_ops->metadata_update_start(mddev);
md_update_sb(mddev, 0);
+ if (mddev_is_clustered(mddev))
+ md_cluster_ops->metadata_update_finish(mddev);
+ }
if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
!test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
@@ -8024,6 +8242,8 @@ void md_reap_sync_thread(struct mddev *mddev)
set_bit(MD_CHANGE_DEVS, &mddev->flags);
}
}
+ if (mddev_is_clustered(mddev))
+ md_cluster_ops->metadata_update_start(mddev);
if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
mddev->pers->finish_reshape)
mddev->pers->finish_reshape(mddev);
@@ -8036,6 +8256,8 @@ void md_reap_sync_thread(struct mddev *mddev)
rdev->saved_raid_disk = -1;
md_update_sb(mddev, 1);
+ if (mddev_is_clustered(mddev))
+ md_cluster_ops->metadata_update_finish(mddev);
clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
@@ -8656,6 +8878,28 @@ err_wq:
return ret;
}
+void md_reload_sb(struct mddev *mddev)
+{
+ struct md_rdev *rdev, *tmp;
+
+ rdev_for_each_safe(rdev, tmp, mddev) {
+ rdev->sb_loaded = 0;
+ ClearPageUptodate(rdev->sb_page);
+ }
+ mddev->raid_disks = 0;
+ analyze_sbs(mddev);
+ rdev_for_each_safe(rdev, tmp, mddev) {
+ struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
+ /* since we don't write to faulty devices, we figure out if the
+ * disk is faulty by comparing events
+ */
+ if (mddev->events > sb->events)
+ set_bit(Faulty, &rdev->flags);
+ }
+
+}
+EXPORT_SYMBOL(md_reload_sb);
+
#ifndef MODULE
/*
diff --git a/drivers/md/md.h b/drivers/md/md.h
index 318ca8fd430f..4046a6c6f223 100644
--- a/drivers/md/md.h
+++ b/drivers/md/md.h
@@ -23,6 +23,7 @@
#include <linux/timer.h>
#include <linux/wait.h>
#include <linux/workqueue.h>
+#include "md-cluster.h"
#define MaxSector (~(sector_t)0)
@@ -170,6 +171,10 @@ enum flag_bits {
* a want_replacement device with same
* raid_disk number.
*/
+ Candidate, /* For clustered environments only:
+ * This device is seen locally but not
+ * by the whole cluster
+ */
};
#define BB_LEN_MASK (0x00000000000001FFULL)
@@ -202,6 +207,8 @@ extern int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
int is_new);
extern void md_ack_all_badblocks(struct badblocks *bb);
+struct md_cluster_info;
+
struct mddev {
void *private;
struct md_personality *pers;
@@ -430,6 +437,8 @@ struct mddev {
unsigned long daemon_sleep; /* how many jiffies between updates? */
unsigned long max_write_behind; /* write-behind mode */
int external;
+ int nodes; /* Maximum number of nodes in the cluster */
+ char cluster_name[64]; /* Name of the cluster */
} bitmap_info;
atomic_t max_corr_read_errors; /* max read retries */
@@ -448,6 +457,7 @@ struct mddev {
struct work_struct flush_work;
struct work_struct event_work; /* used by dm to report failure event */
void (*sync_super)(struct mddev *mddev, struct md_rdev *rdev);
+ struct md_cluster_info *cluster_info;
};
static inline int __must_check mddev_lock(struct mddev *mddev)
@@ -496,7 +506,7 @@ struct md_personality
int (*hot_add_disk) (struct mddev *mddev, struct md_rdev *rdev);
int (*hot_remove_disk) (struct mddev *mddev, struct md_rdev *rdev);
int (*spare_active) (struct mddev *mddev);
- sector_t (*sync_request)(struct mddev *mddev, sector_t sector_nr, int *skipped, int go_faster);
+ sector_t (*sync_request)(struct mddev *mddev, sector_t sector_nr, int *skipped);
int (*resize) (struct mddev *mddev, sector_t sectors);
sector_t (*size) (struct mddev *mddev, sector_t sectors, int raid_disks);
int (*check_reshape) (struct mddev *mddev);
@@ -608,6 +618,11 @@ static inline void safe_put_page(struct page *p)
extern int register_md_personality(struct md_personality *p);
extern int unregister_md_personality(struct md_personality *p);
+extern int register_md_cluster_operations(struct md_cluster_operations *ops,
+ struct module *module);
+extern int unregister_md_cluster_operations(void);
+extern int md_setup_cluster(struct mddev *mddev, int nodes);
+extern void md_cluster_stop(struct mddev *mddev);
extern struct md_thread *md_register_thread(
void (*run)(struct md_thread *thread),
struct mddev *mddev,
@@ -654,6 +669,10 @@ extern struct bio *bio_alloc_mddev(gfp_t gfp_mask, int nr_iovecs,
struct mddev *mddev);
extern void md_unplug(struct blk_plug_cb *cb, bool from_schedule);
+extern void md_reload_sb(struct mddev *mddev);
+extern void md_update_sb(struct mddev *mddev, int force);
+extern void md_kick_rdev_from_array(struct md_rdev * rdev);
+struct md_rdev *md_find_rdev_nr_rcu(struct mddev *mddev, int nr);
static inline int mddev_check_plugged(struct mddev *mddev)
{
return !!blk_check_plugged(md_unplug, mddev,
@@ -669,4 +688,9 @@ static inline void rdev_dec_pending(struct md_rdev *rdev, struct mddev *mddev)
}
}
+extern struct md_cluster_operations *md_cluster_ops;
+static inline int mddev_is_clustered(struct mddev *mddev)
+{
+ return mddev->cluster_info && mddev->bitmap_info.nodes > 1;
+}
#endif /* _MD_MD_H */
diff --git a/drivers/md/raid0.c b/drivers/md/raid0.c
index 3b5d7f704aa3..2cb59a641cd2 100644
--- a/drivers/md/raid0.c
+++ b/drivers/md/raid0.c
@@ -271,14 +271,16 @@ static int create_strip_zones(struct mddev *mddev, struct r0conf **private_conf)
goto abort;
}
- blk_queue_io_min(mddev->queue, mddev->chunk_sectors << 9);
- blk_queue_io_opt(mddev->queue,
- (mddev->chunk_sectors << 9) * mddev->raid_disks);
-
- if (!discard_supported)
- queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, mddev->queue);
- else
- queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, mddev->queue);
+ if (mddev->queue) {
+ blk_queue_io_min(mddev->queue, mddev->chunk_sectors << 9);
+ blk_queue_io_opt(mddev->queue,
+ (mddev->chunk_sectors << 9) * mddev->raid_disks);
+
+ if (!discard_supported)
+ queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, mddev->queue);
+ else
+ queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, mddev->queue);
+ }
pr_debug("md/raid0:%s: done.\n", mdname(mddev));
*private_conf = conf;
@@ -429,9 +431,12 @@ static int raid0_run(struct mddev *mddev)
}
if (md_check_no_bitmap(mddev))
return -EINVAL;
- blk_queue_max_hw_sectors(mddev->queue, mddev->chunk_sectors);
- blk_queue_max_write_same_sectors(mddev->queue, mddev->chunk_sectors);
- blk_queue_max_discard_sectors(mddev->queue, mddev->chunk_sectors);
+
+ if (mddev->queue) {
+ blk_queue_max_hw_sectors(mddev->queue, mddev->chunk_sectors);
+ blk_queue_max_write_same_sectors(mddev->queue, mddev->chunk_sectors);
+ blk_queue_max_discard_sectors(mddev->queue, mddev->chunk_sectors);
+ }
/* if private is not null, we are here after takeover */
if (mddev->private == NULL) {
@@ -448,16 +453,17 @@ static int raid0_run(struct mddev *mddev)
printk(KERN_INFO "md/raid0:%s: md_size is %llu sectors.\n",
mdname(mddev),
(unsigned long long)mddev->array_sectors);
- /* calculate the max read-ahead size.
- * For read-ahead of large files to be effective, we need to
- * readahead at least twice a whole stripe. i.e. number of devices
- * multiplied by chunk size times 2.
- * If an individual device has an ra_pages greater than the
- * chunk size, then we will not drive that device as hard as it
- * wants. We consider this a configuration error: a larger
- * chunksize should be used in that case.
- */
- {
+
+ if (mddev->queue) {
+ /* calculate the max read-ahead size.
+ * For read-ahead of large files to be effective, we need to
+ * readahead at least twice a whole stripe. i.e. number of devices
+ * multiplied by chunk size times 2.
+ * If an individual device has an ra_pages greater than the
+ * chunk size, then we will not drive that device as hard as it
+ * wants. We consider this a configuration error: a larger
+ * chunksize should be used in that case.
+ */
int stripe = mddev->raid_disks *
(mddev->chunk_sectors << 9) / PAGE_SIZE;
if (mddev->queue->backing_dev_info.ra_pages < 2* stripe)
diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index d34e238afa54..9157a29c8dbf 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -539,7 +539,13 @@ static int read_balance(struct r1conf *conf, struct r1bio *r1_bio, int *max_sect
has_nonrot_disk = 0;
choose_next_idle = 0;
- choose_first = (conf->mddev->recovery_cp < this_sector + sectors);
+ if ((conf->mddev->recovery_cp < this_sector + sectors) ||
+ (mddev_is_clustered(conf->mddev) &&
+ md_cluster_ops->area_resyncing(conf->mddev, this_sector,
+ this_sector + sectors)))
+ choose_first = 1;
+ else
+ choose_first = 0;
for (disk = 0 ; disk < conf->raid_disks * 2 ; disk++) {
sector_t dist;
@@ -1102,8 +1108,10 @@ static void make_request(struct mddev *mddev, struct bio * bio)
md_write_start(mddev, bio); /* wait on superblock update early */
if (bio_data_dir(bio) == WRITE &&
- bio_end_sector(bio) > mddev->suspend_lo &&
- bio->bi_iter.bi_sector < mddev->suspend_hi) {
+ ((bio_end_sector(bio) > mddev->suspend_lo &&
+ bio->bi_iter.bi_sector < mddev->suspend_hi) ||
+ (mddev_is_clustered(mddev) &&
+ md_cluster_ops->area_resyncing(mddev, bio->bi_iter.bi_sector, bio_end_sector(bio))))) {
/* As the suspend_* range is controlled by
* userspace, we want an interruptible
* wait.
@@ -1114,7 +1122,10 @@ static void make_request(struct mddev *mddev, struct bio * bio)
prepare_to_wait(&conf->wait_barrier,
&w, TASK_INTERRUPTIBLE);
if (bio_end_sector(bio) <= mddev->suspend_lo ||
- bio->bi_iter.bi_sector >= mddev->suspend_hi)
+ bio->bi_iter.bi_sector >= mddev->suspend_hi ||
+ (mddev_is_clustered(mddev) &&
+ !md_cluster_ops->area_resyncing(mddev,
+ bio->bi_iter.bi_sector, bio_end_sector(bio))))
break;
schedule();
}
@@ -1561,6 +1572,7 @@ static int raid1_spare_active(struct mddev *mddev)
struct md_rdev *rdev = conf->mirrors[i].rdev;
struct md_rdev *repl = conf->mirrors[conf->raid_disks + i].rdev;
if (repl
+ && !test_bit(Candidate, &repl->flags)
&& repl->recovery_offset == MaxSector
&& !test_bit(Faulty, &repl->flags)
&& !test_and_set_bit(In_sync, &repl->flags)) {
@@ -2468,7 +2480,7 @@ static int init_resync(struct r1conf *conf)
* that can be installed to exclude normal IO requests.
*/
-static sector_t sync_request(struct mddev *mddev, sector_t sector_nr, int *skipped, int go_faster)
+static sector_t sync_request(struct mddev *mddev, sector_t sector_nr, int *skipped)
{
struct r1conf *conf = mddev->private;
struct r1bio *r1_bio;
@@ -2521,13 +2533,6 @@ static sector_t sync_request(struct mddev *mddev, sector_t sector_nr, int *skipp
*skipped = 1;
return sync_blocks;
}
- /*
- * If there is non-resync activity waiting for a turn,
- * and resync is going fast enough,
- * then let it though before starting on this new sync request.
- */
- if (!go_faster && conf->nr_waiting)
- msleep_interruptible(1000);
bitmap_cond_end_sync(mddev->bitmap, sector_nr);
r1_bio = mempool_alloc(conf->r1buf_pool, GFP_NOIO);
diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index a7196c49d15d..e793ab6b3570 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -2889,7 +2889,7 @@ static int init_resync(struct r10conf *conf)
*/
static sector_t sync_request(struct mddev *mddev, sector_t sector_nr,
- int *skipped, int go_faster)
+ int *skipped)
{
struct r10conf *conf = mddev->private;
struct r10bio *r10_bio;
@@ -2994,12 +2994,6 @@ static sector_t sync_request(struct mddev *mddev, sector_t sector_nr,
if (conf->geo.near_copies < conf->geo.raid_disks &&
max_sector > (sector_nr | chunk_mask))
max_sector = (sector_nr | chunk_mask) + 1;
- /*
- * If there is non-resync activity waiting for us then
- * put in a delay to throttle resync.
- */
- if (!go_faster && conf->nr_waiting)
- msleep_interruptible(1000);
/* Again, very different code for resync and recovery.
* Both must result in an r10bio with a list of bios that
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index cd2f96b2c572..77dfd720aaa0 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -54,6 +54,7 @@
#include <linux/slab.h>
#include <linux/ratelimit.h>
#include <linux/nodemask.h>
+#include <linux/flex_array.h>
#include <trace/events/block.h>
#include "md.h"
@@ -496,7 +497,7 @@ static void shrink_buffers(struct stripe_head *sh)
}
}
-static int grow_buffers(struct stripe_head *sh)
+static int grow_buffers(struct stripe_head *sh, gfp_t gfp)
{
int i;
int num = sh->raid_conf->pool_size;
@@ -504,7 +505,7 @@ static int grow_buffers(struct stripe_head *sh)
for (i = 0; i < num; i++) {
struct page *page;
- if (!(page = alloc_page(GFP_KERNEL))) {
+ if (!(page = alloc_page(gfp))) {
return 1;
}
sh->dev[i].page = page;
@@ -525,6 +526,7 @@ static void init_stripe(struct stripe_head *sh, sector_t sector, int previous)
BUG_ON(atomic_read(&sh->count) != 0);
BUG_ON(test_bit(STRIPE_HANDLE, &sh->state));
BUG_ON(stripe_operations_active(sh));
+ BUG_ON(sh->batch_head);
pr_debug("init_stripe called, stripe %llu\n",
(unsigned long long)sector);
@@ -552,8 +554,10 @@ retry:
}
if (read_seqcount_retry(&conf->gen_lock, seq))
goto retry;
+ sh->overwrite_disks = 0;
insert_hash(conf, sh);
sh->cpu = smp_processor_id();
+ set_bit(STRIPE_BATCH_READY, &sh->state);
}
static struct stripe_head *__find_stripe(struct r5conf *conf, sector_t sector,
@@ -668,20 +672,28 @@ get_active_stripe(struct r5conf *conf, sector_t sector,
*(conf->hash_locks + hash));
sh = __find_stripe(conf, sector, conf->generation - previous);
if (!sh) {
- if (!conf->inactive_blocked)
+ if (!test_bit(R5_INACTIVE_BLOCKED, &conf->cache_state)) {
sh = get_free_stripe(conf, hash);
+ if (!sh && llist_empty(&conf->released_stripes) &&
+ !test_bit(R5_DID_ALLOC, &conf->cache_state))
+ set_bit(R5_ALLOC_MORE,
+ &conf->cache_state);
+ }
if (noblock && sh == NULL)
break;
if (!sh) {
- conf->inactive_blocked = 1;
+ set_bit(R5_INACTIVE_BLOCKED,
+ &conf->cache_state);
wait_event_lock_irq(
conf->wait_for_stripe,
!list_empty(conf->inactive_list + hash) &&
(atomic_read(&conf->active_stripes)
< (conf->max_nr_stripes * 3 / 4)
- || !conf->inactive_blocked),
+ || !test_bit(R5_INACTIVE_BLOCKED,
+ &conf->cache_state)),
*(conf->hash_locks + hash));
- conf->inactive_blocked = 0;
+ clear_bit(R5_INACTIVE_BLOCKED,
+ &conf->cache_state);
} else {
init_stripe(sh, sector, previous);
atomic_inc(&sh->count);
@@ -708,6 +720,130 @@ get_active_stripe(struct r5conf *conf, sector_t sector,
return sh;
}
+static bool is_full_stripe_write(struct stripe_head *sh)
+{
+ BUG_ON(sh->overwrite_disks > (sh->disks - sh->raid_conf->max_degraded));
+ return sh->overwrite_disks == (sh->disks - sh->raid_conf->max_degraded);
+}
+
+static void lock_two_stripes(struct stripe_head *sh1, struct stripe_head *sh2)
+{
+ local_irq_disable();
+ if (sh1 > sh2) {
+ spin_lock(&sh2->stripe_lock);
+ spin_lock_nested(&sh1->stripe_lock, 1);
+ } else {
+ spin_lock(&sh1->stripe_lock);
+ spin_lock_nested(&sh2->stripe_lock, 1);
+ }
+}
+
+static void unlock_two_stripes(struct stripe_head *sh1, struct stripe_head *sh2)
+{
+ spin_unlock(&sh1->stripe_lock);
+ spin_unlock(&sh2->stripe_lock);
+ local_irq_enable();
+}
+
+/* Only freshly new full stripe normal write stripe can be added to a batch list */
+static bool stripe_can_batch(struct stripe_head *sh)
+{
+ return test_bit(STRIPE_BATCH_READY, &sh->state) &&
+ is_full_stripe_write(sh);
+}
+
+/* we only do back search */
+static void stripe_add_to_batch_list(struct r5conf *conf, struct stripe_head *sh)
+{
+ struct stripe_head *head;
+ sector_t head_sector, tmp_sec;
+ int hash;
+ int dd_idx;
+
+ if (!stripe_can_batch(sh))
+ return;
+ /* Don't cross chunks, so stripe pd_idx/qd_idx is the same */
+ tmp_sec = sh->sector;
+ if (!sector_div(tmp_sec, conf->chunk_sectors))
+ return;
+ head_sector = sh->sector - STRIPE_SECTORS;
+
+ hash = stripe_hash_locks_hash(head_sector);
+ spin_lock_irq(conf->hash_locks + hash);
+ head = __find_stripe(conf, head_sector, conf->generation);
+ if (head && !atomic_inc_not_zero(&head->count)) {
+ spin_lock(&conf->device_lock);
+ if (!atomic_read(&head->count)) {
+ if (!test_bit(STRIPE_HANDLE, &head->state))
+ atomic_inc(&conf->active_stripes);
+ BUG_ON(list_empty(&head->lru) &&
+ !test_bit(STRIPE_EXPANDING, &head->state));
+ list_del_init(&head->lru);
+ if (head->group) {
+ head->group->stripes_cnt--;
+ head->group = NULL;
+ }
+ }
+ atomic_inc(&head->count);
+ spin_unlock(&conf->device_lock);
+ }
+ spin_unlock_irq(conf->hash_locks + hash);
+
+ if (!head)
+ return;
+ if (!stripe_can_batch(head))
+ goto out;
+
+ lock_two_stripes(head, sh);
+ /* clear_batch_ready clear the flag */
+ if (!stripe_can_batch(head) || !stripe_can_batch(sh))
+ goto unlock_out;
+
+ if (sh->batch_head)
+ goto unlock_out;
+
+ dd_idx = 0;
+ while (dd_idx == sh->pd_idx || dd_idx == sh->qd_idx)
+ dd_idx++;
+ if (head->dev[dd_idx].towrite->bi_rw != sh->dev[dd_idx].towrite->bi_rw)
+ goto unlock_out;
+
+ if (head->batch_head) {
+ spin_lock(&head->batch_head->batch_lock);
+ /* This batch list is already running */
+ if (!stripe_can_batch(head)) {
+ spin_unlock(&head->batch_head->batch_lock);
+ goto unlock_out;
+ }
+
+ /*
+ * at this point, head's BATCH_READY could be cleared, but we
+ * can still add the stripe to batch list
+ */
+ list_add(&sh->batch_list, &head->batch_list);
+ spin_unlock(&head->batch_head->batch_lock);
+
+ sh->batch_head = head->batch_head;
+ } else {
+ head->batch_head = head;
+ sh->batch_head = head->batch_head;
+ spin_lock(&head->batch_lock);
+ list_add_tail(&sh->batch_list, &head->batch_list);
+ spin_unlock(&head->batch_lock);
+ }
+
+ if (test_and_clear_bit(STRIPE_PREREAD_ACTIVE, &sh->state))
+ if (atomic_dec_return(&conf->preread_active_stripes)
+ < IO_THRESHOLD)
+ md_wakeup_thread(conf->mddev->thread);
+
+ atomic_inc(&sh->count);
+unlock_out:
+ unlock_two_stripes(head, sh);
+out:
+ release_stripe(head);
+}
+
/* Determine if 'data_offset' or 'new_data_offset' should be used
* in this stripe_head.
*/
@@ -738,6 +874,7 @@ static void ops_run_io(struct stripe_head *sh, struct stripe_head_state *s)
{
struct r5conf *conf = sh->raid_conf;
int i, disks = sh->disks;
+ struct stripe_head *head_sh = sh;
might_sleep();
@@ -746,6 +883,8 @@ static void ops_run_io(struct stripe_head *sh, struct stripe_head_state *s)
int replace_only = 0;
struct bio *bi, *rbi;
struct md_rdev *rdev, *rrdev = NULL;
+
+ sh = head_sh;
if (test_and_clear_bit(R5_Wantwrite, &sh->dev[i].flags)) {
if (test_and_clear_bit(R5_WantFUA, &sh->dev[i].flags))
rw = WRITE_FUA;
@@ -764,6 +903,7 @@ static void ops_run_io(struct stripe_head *sh, struct stripe_head_state *s)
if (test_and_clear_bit(R5_SyncIO, &sh->dev[i].flags))
rw |= REQ_SYNC;
+again:
bi = &sh->dev[i].req;
rbi = &sh->dev[i].rreq; /* For writing to replacement */
@@ -782,7 +922,7 @@ static void ops_run_io(struct stripe_head *sh, struct stripe_head_state *s)
/* We raced and saw duplicates */
rrdev = NULL;
} else {
- if (test_bit(R5_ReadRepl, &sh->dev[i].flags) && rrdev)
+ if (test_bit(R5_ReadRepl, &head_sh->dev[i].flags) && rrdev)
rdev = rrdev;
rrdev = NULL;
}
@@ -853,13 +993,15 @@ static void ops_run_io(struct stripe_head *sh, struct stripe_head_state *s)
__func__, (unsigned long long)sh->sector,
bi->bi_rw, i);
atomic_inc(&sh->count);
+ if (sh != head_sh)
+ atomic_inc(&head_sh->count);
if (use_new_offset(conf, sh))
bi->bi_iter.bi_sector = (sh->sector
+ rdev->new_data_offset);
else
bi->bi_iter.bi_sector = (sh->sector
+ rdev->data_offset);
- if (test_bit(R5_ReadNoMerge, &sh->dev[i].flags))
+ if (test_bit(R5_ReadNoMerge, &head_sh->dev[i].flags))
bi->bi_rw |= REQ_NOMERGE;
if (test_bit(R5_SkipCopy, &sh->dev[i].flags))
@@ -903,6 +1045,8 @@ static void ops_run_io(struct stripe_head *sh, struct stripe_head_state *s)
__func__, (unsigned long long)sh->sector,
rbi->bi_rw, i);
atomic_inc(&sh->count);
+ if (sh != head_sh)
+ atomic_inc(&head_sh->count);
if (use_new_offset(conf, sh))
rbi->bi_iter.bi_sector = (sh->sector
+ rrdev->new_data_offset);
@@ -934,8 +1078,18 @@ static void ops_run_io(struct stripe_head *sh, struct stripe_head_state *s)
pr_debug("skip op %ld on disc %d for sector %llu\n",
bi->bi_rw, i, (unsigned long long)sh->sector);
clear_bit(R5_LOCKED, &sh->dev[i].flags);
+ if (sh->batch_head)
+ set_bit(STRIPE_BATCH_ERR,
+ &sh->batch_head->state);
set_bit(STRIPE_HANDLE, &sh->state);
}
+
+ if (!head_sh->batch_head)
+ continue;
+ sh = list_first_entry(&sh->batch_list, struct stripe_head,
+ batch_list);
+ if (sh != head_sh)
+ goto again;
}
}
@@ -1051,6 +1205,7 @@ static void ops_run_biofill(struct stripe_head *sh)
struct async_submit_ctl submit;
int i;
+ BUG_ON(sh->batch_head);
pr_debug("%s: stripe %llu\n", __func__,
(unsigned long long)sh->sector);
@@ -1109,16 +1264,28 @@ static void ops_complete_compute(void *stripe_head_ref)
/* return a pointer to the address conversion region of the scribble buffer */
static addr_conv_t *to_addr_conv(struct stripe_head *sh,
- struct raid5_percpu *percpu)
+ struct raid5_percpu *percpu, int i)
{
- return percpu->scribble + sizeof(struct page *) * (sh->disks + 2);
+ void *addr;
+
+ addr = flex_array_get(percpu->scribble, i);
+ return addr + sizeof(struct page *) * (sh->disks + 2);
+}
+
+/* return a pointer to the address conversion region of the scribble buffer */
+static struct page **to_addr_page(struct raid5_percpu *percpu, int i)
+{
+ void *addr;
+
+ addr = flex_array_get(percpu->scribble, i);
+ return addr;
}
static struct dma_async_tx_descriptor *
ops_run_compute5(struct stripe_head *sh, struct raid5_percpu *percpu)
{
int disks = sh->disks;
- struct page **xor_srcs = percpu->scribble;
+ struct page **xor_srcs = to_addr_page(percpu, 0);
int target = sh->ops.target;
struct r5dev *tgt = &sh->dev[target];
struct page *xor_dest = tgt->page;
@@ -1127,6 +1294,8 @@ ops_run_compute5(struct stripe_head *sh, struct raid5_percpu *percpu)
struct async_submit_ctl submit;
int i;
+ BUG_ON(sh->batch_head);
+
pr_debug("%s: stripe %llu block: %d\n",
__func__, (unsigned long long)sh->sector, target);
BUG_ON(!test_bit(R5_Wantcompute, &tgt->flags));
@@ -1138,7 +1307,7 @@ ops_run_compute5(struct stripe_head *sh, struct raid5_percpu *percpu)
atomic_inc(&sh->count);
init_async_submit(&submit, ASYNC_TX_FENCE|ASYNC_TX_XOR_ZERO_DST, NULL,
- ops_complete_compute, sh, to_addr_conv(sh, percpu));
+ ops_complete_compute, sh, to_addr_conv(sh, percpu, 0));
if (unlikely(count == 1))
tx = async_memcpy(xor_dest, xor_srcs[0], 0, 0, STRIPE_SIZE, &submit);
else
@@ -1156,7 +1325,9 @@ ops_run_compute5(struct stripe_head *sh, struct raid5_percpu *percpu)
* destination buffer is recorded in srcs[count] and the Q destination
* is recorded in srcs[count+1]].
*/
-static int set_syndrome_sources(struct page **srcs, struct stripe_head *sh)
+static int set_syndrome_sources(struct page **srcs,
+ struct stripe_head *sh,
+ int srctype)
{
int disks = sh->disks;
int syndrome_disks = sh->ddf_layout ? disks : (disks - 2);
@@ -1171,8 +1342,15 @@ static int set_syndrome_sources(struct page **srcs, struct stripe_head *sh)
i = d0_idx;
do {
int slot = raid6_idx_to_slot(i, sh, &count, syndrome_disks);
+ struct r5dev *dev = &sh->dev[i];
- srcs[slot] = sh->dev[i].page;
+ if (i == sh->qd_idx || i == sh->pd_idx ||
+ (srctype == SYNDROME_SRC_ALL) ||
+ (srctype == SYNDROME_SRC_WANT_DRAIN &&
+ test_bit(R5_Wantdrain, &dev->flags)) ||
+ (srctype == SYNDROME_SRC_WRITTEN &&
+ dev->written))
+ srcs[slot] = sh->dev[i].page;
i = raid6_next_disk(i, disks);
} while (i != d0_idx);
@@ -1183,7 +1361,7 @@ static struct dma_async_tx_descriptor *
ops_run_compute6_1(struct stripe_head *sh, struct raid5_percpu *percpu)
{
int disks = sh->disks;
- struct page **blocks = percpu->scribble;
+ struct page **blocks = to_addr_page(percpu, 0);
int target;
int qd_idx = sh->qd_idx;
struct dma_async_tx_descriptor *tx;
@@ -1193,6 +1371,7 @@ ops_run_compute6_1(struct stripe_head *sh, struct raid5_percpu *percpu)
int i;
int count;
+ BUG_ON(sh->batch_head);
if (sh->ops.target < 0)
target = sh->ops.target2;
else if (sh->ops.target2 < 0)
@@ -1211,12 +1390,12 @@ ops_run_compute6_1(struct stripe_head *sh, struct raid5_percpu *percpu)
atomic_inc(&sh->count);
if (target == qd_idx) {
- count = set_syndrome_sources(blocks, sh);
+ count = set_syndrome_sources(blocks, sh, SYNDROME_SRC_ALL);
blocks[count] = NULL; /* regenerating p is not necessary */
BUG_ON(blocks[count+1] != dest); /* q should already be set */
init_async_submit(&submit, ASYNC_TX_FENCE, NULL,
ops_complete_compute, sh,
- to_addr_conv(sh, percpu));
+ to_addr_conv(sh, percpu, 0));
tx = async_gen_syndrome(blocks, 0, count+2, STRIPE_SIZE, &submit);
} else {
/* Compute any data- or p-drive using XOR */
@@ -1229,7 +1408,7 @@ ops_run_compute6_1(struct stripe_head *sh, struct raid5_percpu *percpu)
init_async_submit(&submit, ASYNC_TX_FENCE|ASYNC_TX_XOR_ZERO_DST,
NULL, ops_complete_compute, sh,
- to_addr_conv(sh, percpu));
+ to_addr_conv(sh, percpu, 0));
tx = async_xor(dest, blocks, 0, count, STRIPE_SIZE, &submit);
}
@@ -1248,9 +1427,10 @@ ops_run_compute6_2(struct stripe_head *sh, struct raid5_percpu *percpu)
struct r5dev *tgt = &sh->dev[target];
struct r5dev *tgt2 = &sh->dev[target2];
struct dma_async_tx_descriptor *tx;
- struct page **blocks = percpu->scribble;
+ struct page **blocks = to_addr_page(percpu, 0);
struct async_submit_ctl submit;
+ BUG_ON(sh->batch_head);
pr_debug("%s: stripe %llu block1: %d block2: %d\n",
__func__, (unsigned long long)sh->sector, target, target2);
BUG_ON(target < 0 || target2 < 0);
@@ -1290,7 +1470,7 @@ ops_run_compute6_2(struct stripe_head *sh, struct raid5_percpu *percpu)
/* Missing P+Q, just recompute */
init_async_submit(&submit, ASYNC_TX_FENCE, NULL,
ops_complete_compute, sh,
- to_addr_conv(sh, percpu));
+ to_addr_conv(sh, percpu, 0));
return async_gen_syndrome(blocks, 0, syndrome_disks+2,
STRIPE_SIZE, &submit);
} else {
@@ -1314,21 +1494,21 @@ ops_run_compute6_2(struct stripe_head *sh, struct raid5_percpu *percpu)
init_async_submit(&submit,
ASYNC_TX_FENCE|ASYNC_TX_XOR_ZERO_DST,
NULL, NULL, NULL,
- to_addr_conv(sh, percpu));
+ to_addr_conv(sh, percpu, 0));
tx = async_xor(dest, blocks, 0, count, STRIPE_SIZE,
&submit);
- count = set_syndrome_sources(blocks, sh);
+ count = set_syndrome_sources(blocks, sh, SYNDROME_SRC_ALL);
init_async_submit(&submit, ASYNC_TX_FENCE, tx,
ops_complete_compute, sh,
- to_addr_conv(sh, percpu));
+ to_addr_conv(sh, percpu, 0));
return async_gen_syndrome(blocks, 0, count+2,
STRIPE_SIZE, &submit);
}
} else {
init_async_submit(&submit, ASYNC_TX_FENCE, NULL,
ops_complete_compute, sh,
- to_addr_conv(sh, percpu));
+ to_addr_conv(sh, percpu, 0));
if (failb == syndrome_disks) {
/* We're missing D+P. */
return async_raid6_datap_recov(syndrome_disks+2,
@@ -1352,17 +1532,18 @@ static void ops_complete_prexor(void *stripe_head_ref)
}
static struct dma_async_tx_descriptor *
-ops_run_prexor(struct stripe_head *sh, struct raid5_percpu *percpu,
- struct dma_async_tx_descriptor *tx)
+ops_run_prexor5(struct stripe_head *sh, struct raid5_percpu *percpu,
+ struct dma_async_tx_descriptor *tx)
{
int disks = sh->disks;
- struct page **xor_srcs = percpu->scribble;
+ struct page **xor_srcs = to_addr_page(percpu, 0);
int count = 0, pd_idx = sh->pd_idx, i;
struct async_submit_ctl submit;
/* existing parity data subtracted */
struct page *xor_dest = xor_srcs[count++] = sh->dev[pd_idx].page;
+ BUG_ON(sh->batch_head);
pr_debug("%s: stripe %llu\n", __func__,
(unsigned long long)sh->sector);
@@ -1374,31 +1555,56 @@ ops_run_prexor(struct stripe_head *sh, struct raid5_percpu *percpu,
}
init_async_submit(&submit, ASYNC_TX_FENCE|ASYNC_TX_XOR_DROP_DST, tx,
- ops_complete_prexor, sh, to_addr_conv(sh, percpu));
+ ops_complete_prexor, sh, to_addr_conv(sh, percpu, 0));
tx = async_xor(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, &submit);
return tx;
}
static struct dma_async_tx_descriptor *
+ops_run_prexor6(struct stripe_head *sh, struct raid5_percpu *percpu,
+ struct dma_async_tx_descriptor *tx)
+{
+ struct page **blocks = to_addr_page(percpu, 0);
+ int count;
+ struct async_submit_ctl submit;
+
+ pr_debug("%s: stripe %llu\n", __func__,
+ (unsigned long long)sh->sector);
+
+ count = set_syndrome_sources(blocks, sh, SYNDROME_SRC_WANT_DRAIN);
+
+ init_async_submit(&submit, ASYNC_TX_FENCE|ASYNC_TX_PQ_XOR_DST, tx,
+ ops_complete_prexor, sh, to_addr_conv(sh, percpu, 0));
+ tx = async_gen_syndrome(blocks, 0, count+2, STRIPE_SIZE, &submit);
+
+ return tx;
+}
+
+static struct dma_async_tx_descriptor *
ops_run_biodrain(struct stripe_head *sh, struct dma_async_tx_descriptor *tx)
{
int disks = sh->disks;
int i;
+ struct stripe_head *head_sh = sh;
pr_debug("%s: stripe %llu\n", __func__,
(unsigned long long)sh->sector);
for (i = disks; i--; ) {
- struct r5dev *dev = &sh->dev[i];
+ struct r5dev *dev;
struct bio *chosen;
- if (test_and_clear_bit(R5_Wantdrain, &dev->flags)) {
+ sh = head_sh;
+ if (test_and_clear_bit(R5_Wantdrain, &head_sh->dev[i].flags)) {
struct bio *wbi;
+again:
+ dev = &sh->dev[i];
spin_lock_irq(&sh->stripe_lock);
chosen = dev->towrite;
dev->towrite = NULL;
+ sh->overwrite_disks = 0;
BUG_ON(dev->written);
wbi = dev->written = chosen;
spin_unlock_irq(&sh->stripe_lock);
@@ -1423,6 +1629,15 @@ ops_run_biodrain(struct stripe_head *sh, struct dma_async_tx_descriptor *tx)
}
wbi = r5_next_bio(wbi, dev->sector);
}
+
+ if (head_sh->batch_head) {
+ sh = list_first_entry(&sh->batch_list,
+ struct stripe_head,
+ batch_list);
+ if (sh == head_sh)
+ continue;
+ goto again;
+ }
}
}
@@ -1478,12 +1693,15 @@ ops_run_reconstruct5(struct stripe_head *sh, struct raid5_percpu *percpu,
struct dma_async_tx_descriptor *tx)
{
int disks = sh->disks;
- struct page **xor_srcs = percpu->scribble;
+ struct page **xor_srcs;
struct async_submit_ctl submit;
- int count = 0, pd_idx = sh->pd_idx, i;
+ int count, pd_idx = sh->pd_idx, i;
struct page *xor_dest;
int prexor = 0;
unsigned long flags;
+ int j = 0;
+ struct stripe_head *head_sh = sh;
+ int last_stripe;
pr_debug("%s: stripe %llu\n", __func__,
(unsigned long long)sh->sector);
@@ -1500,15 +1718,18 @@ ops_run_reconstruct5(struct stripe_head *sh, struct raid5_percpu *percpu,
ops_complete_reconstruct(sh);
return;
}
+again:
+ count = 0;
+ xor_srcs = to_addr_page(percpu, j);
/* check if prexor is active which means only process blocks
* that are part of a read-modify-write (written)
*/
- if (sh->reconstruct_state == reconstruct_state_prexor_drain_run) {
+ if (head_sh->reconstruct_state == reconstruct_state_prexor_drain_run) {
prexor = 1;
xor_dest = xor_srcs[count++] = sh->dev[pd_idx].page;
for (i = disks; i--; ) {
struct r5dev *dev = &sh->dev[i];
- if (dev->written)
+ if (head_sh->dev[i].written)
xor_srcs[count++] = dev->page;
}
} else {
@@ -1525,17 +1746,32 @@ ops_run_reconstruct5(struct stripe_head *sh, struct raid5_percpu *percpu,
* set ASYNC_TX_XOR_DROP_DST and ASYNC_TX_XOR_ZERO_DST
* for the synchronous xor case
*/
- flags = ASYNC_TX_ACK |
- (prexor ? ASYNC_TX_XOR_DROP_DST : ASYNC_TX_XOR_ZERO_DST);
-
- atomic_inc(&sh->count);
+ last_stripe = !head_sh->batch_head ||
+ list_first_entry(&sh->batch_list,
+ struct stripe_head, batch_list) == head_sh;
+ if (last_stripe) {
+ flags = ASYNC_TX_ACK |
+ (prexor ? ASYNC_TX_XOR_DROP_DST : ASYNC_TX_XOR_ZERO_DST);
+
+ atomic_inc(&head_sh->count);
+ init_async_submit(&submit, flags, tx, ops_complete_reconstruct, head_sh,
+ to_addr_conv(sh, percpu, j));
+ } else {
+ flags = prexor ? ASYNC_TX_XOR_DROP_DST : ASYNC_TX_XOR_ZERO_DST;
+ init_async_submit(&submit, flags, tx, NULL, NULL,
+ to_addr_conv(sh, percpu, j));
+ }
- init_async_submit(&submit, flags, tx, ops_complete_reconstruct, sh,
- to_addr_conv(sh, percpu));
if (unlikely(count == 1))
tx = async_memcpy(xor_dest, xor_srcs[0], 0, 0, STRIPE_SIZE, &submit);
else
tx = async_xor(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, &submit);
+ if (!last_stripe) {
+ j++;
+ sh = list_first_entry(&sh->batch_list, struct stripe_head,
+ batch_list);
+ goto again;
+ }
}
static void
@@ -1543,8 +1779,12 @@ ops_run_reconstruct6(struct stripe_head *sh, struct raid5_percpu *percpu,
struct dma_async_tx_descriptor *tx)
{
struct async_submit_ctl submit;
- struct page **blocks = percpu->scribble;
- int count, i;
+ struct page **blocks;
+ int count, i, j = 0;
+ struct stripe_head *head_sh = sh;
+ int last_stripe;
+ int synflags;
+ unsigned long txflags;
pr_debug("%s: stripe %llu\n", __func__, (unsigned long long)sh->sector);
@@ -1562,13 +1802,36 @@ ops_run_reconstruct6(struct stripe_head *sh, struct raid5_percpu *percpu,
return;
}
- count = set_syndrome_sources(blocks, sh);
+again:
+ blocks = to_addr_page(percpu, j);
- atomic_inc(&sh->count);
+ if (sh->reconstruct_state == reconstruct_state_prexor_drain_run) {
+ synflags = SYNDROME_SRC_WRITTEN;
+ txflags = ASYNC_TX_ACK | ASYNC_TX_PQ_XOR_DST;
+ } else {
+ synflags = SYNDROME_SRC_ALL;
+ txflags = ASYNC_TX_ACK;
+ }
+
+ count = set_syndrome_sources(blocks, sh, synflags);
+ last_stripe = !head_sh->batch_head ||
+ list_first_entry(&sh->batch_list,
+ struct stripe_head, batch_list) == head_sh;
- init_async_submit(&submit, ASYNC_TX_ACK, tx, ops_complete_reconstruct,
- sh, to_addr_conv(sh, percpu));
+ if (last_stripe) {
+ atomic_inc(&head_sh->count);
+ init_async_submit(&submit, txflags, tx, ops_complete_reconstruct,
+ head_sh, to_addr_conv(sh, percpu, j));
+ } else
+ init_async_submit(&submit, 0, tx, NULL, NULL,
+ to_addr_conv(sh, percpu, j));
async_gen_syndrome(blocks, 0, count+2, STRIPE_SIZE, &submit);
+ if (!last_stripe) {
+ j++;
+ sh = list_first_entry(&sh->batch_list, struct stripe_head,
+ batch_list);
+ goto again;
+ }
}
static void ops_complete_check(void *stripe_head_ref)
@@ -1589,7 +1852,7 @@ static void ops_run_check_p(struct stripe_head *sh, struct raid5_percpu *percpu)
int pd_idx = sh->pd_idx;
int qd_idx = sh->qd_idx;
struct page *xor_dest;
- struct page **xor_srcs = percpu->scribble;
+ struct page **xor_srcs = to_addr_page(percpu, 0);
struct dma_async_tx_descriptor *tx;
struct async_submit_ctl submit;
int count;
@@ -1598,6 +1861,7 @@ static void ops_run_check_p(struct stripe_head *sh, struct raid5_percpu *percpu)
pr_debug("%s: stripe %llu\n", __func__,
(unsigned long long)sh->sector);
+ BUG_ON(sh->batch_head);
count = 0;
xor_dest = sh->dev[pd_idx].page;
xor_srcs[count++] = xor_dest;
@@ -1608,7 +1872,7 @@ static void ops_run_check_p(struct stripe_head *sh, struct raid5_percpu *percpu)
}
init_async_submit(&submit, 0, NULL, NULL, NULL,
- to_addr_conv(sh, percpu));
+ to_addr_conv(sh, percpu, 0));
tx = async_xor_val(xor_dest, xor_srcs, 0, count, STRIPE_SIZE,
&sh->ops.zero_sum_result, &submit);
@@ -1619,20 +1883,21 @@ static void ops_run_check_p(struct stripe_head *sh, struct raid5_percpu *percpu)
static void ops_run_check_pq(struct stripe_head *sh, struct raid5_percpu *percpu, int checkp)
{
- struct page **srcs = percpu->scribble;
+ struct page **srcs = to_addr_page(percpu, 0);
struct async_submit_ctl submit;
int count;
pr_debug("%s: stripe %llu checkp: %d\n", __func__,
(unsigned long long)sh->sector, checkp);
- count = set_syndrome_sources(srcs, sh);
+ BUG_ON(sh->batch_head);
+ count = set_syndrome_sources(srcs, sh, SYNDROME_SRC_ALL);
if (!checkp)
srcs[count] = NULL;
atomic_inc(&sh->count);
init_async_submit(&submit, ASYNC_TX_ACK, NULL, ops_complete_check,
- sh, to_addr_conv(sh, percpu));
+ sh, to_addr_conv(sh, percpu, 0));
async_syndrome_val(srcs, 0, count+2, STRIPE_SIZE,
&sh->ops.zero_sum_result, percpu->spare_page, &submit);
}
@@ -1667,8 +1932,12 @@ static void raid_run_ops(struct stripe_head *sh, unsigned long ops_request)
async_tx_ack(tx);
}
- if (test_bit(STRIPE_OP_PREXOR, &ops_request))
- tx = ops_run_prexor(sh, percpu, tx);
+ if (test_bit(STRIPE_OP_PREXOR, &ops_request)) {
+ if (level < 6)
+ tx = ops_run_prexor5(sh, percpu, tx);
+ else
+ tx = ops_run_prexor6(sh, percpu, tx);
+ }
if (test_bit(STRIPE_OP_BIODRAIN, &ops_request)) {
tx = ops_run_biodrain(sh, tx);
@@ -1693,7 +1962,7 @@ static void raid_run_ops(struct stripe_head *sh, unsigned long ops_request)
BUG();
}
- if (overlap_clear)
+ if (overlap_clear && !sh->batch_head)
for (i = disks; i--; ) {
struct r5dev *dev = &sh->dev[i];
if (test_and_clear_bit(R5_Overlap, &dev->flags))
@@ -1702,10 +1971,10 @@ static void raid_run_ops(struct stripe_head *sh, unsigned long ops_request)
put_cpu();
}
-static int grow_one_stripe(struct r5conf *conf, int hash)
+static int grow_one_stripe(struct r5conf *conf, gfp_t gfp)
{
struct stripe_head *sh;
- sh = kmem_cache_zalloc(conf->slab_cache, GFP_KERNEL);
+ sh = kmem_cache_zalloc(conf->slab_cache, gfp);
if (!sh)
return 0;
@@ -1713,17 +1982,23 @@ static int grow_one_stripe(struct r5conf *conf, int hash)
spin_lock_init(&sh->stripe_lock);
- if (grow_buffers(sh)) {
+ if (grow_buffers(sh, gfp)) {
shrink_buffers(sh);
kmem_cache_free(conf->slab_cache, sh);
return 0;
}
- sh->hash_lock_index = hash;
+ sh->hash_lock_index =
+ conf->max_nr_stripes % NR_STRIPE_HASH_LOCKS;
/* we just created an active stripe so... */
atomic_set(&sh->count, 1);
atomic_inc(&conf->active_stripes);
INIT_LIST_HEAD(&sh->lru);
+
+ spin_lock_init(&sh->batch_lock);
+ INIT_LIST_HEAD(&sh->batch_list);
+ sh->batch_head = NULL;
release_stripe(sh);
+ conf->max_nr_stripes++;
return 1;
}
@@ -1731,7 +2006,6 @@ static int grow_stripes(struct r5conf *conf, int num)
{
struct kmem_cache *sc;
int devs = max(conf->raid_disks, conf->previous_raid_disks);
- int hash;
if (conf->mddev->gendisk)
sprintf(conf->cache_name[0],
@@ -1749,13 +2023,10 @@ static int grow_stripes(struct r5conf *conf, int num)
return 1;
conf->slab_cache = sc;
conf->pool_size = devs;
- hash = conf->max_nr_stripes % NR_STRIPE_HASH_LOCKS;
- while (num--) {
- if (!grow_one_stripe(conf, hash))
+ while (num--)
+ if (!grow_one_stripe(conf, GFP_KERNEL))
return 1;
- conf->max_nr_stripes++;
- hash = (hash + 1) % NR_STRIPE_HASH_LOCKS;
- }
+
return 0;
}
@@ -1772,13 +2043,21 @@ static int grow_stripes(struct r5conf *conf, int num)
* calculate over all devices (not just the data blocks), using zeros in place
* of the P and Q blocks.
*/
-static size_t scribble_len(int num)
+static struct flex_array *scribble_alloc(int num, int cnt, gfp_t flags)
{
+ struct flex_array *ret;
size_t len;
len = sizeof(struct page *) * (num+2) + sizeof(addr_conv_t) * (num+2);
-
- return len;
+ ret = flex_array_alloc(len, cnt, flags);
+ if (!ret)
+ return NULL;
+ /* always prealloc all elements, so no locking is required */
+ if (flex_array_prealloc(ret, 0, cnt, flags)) {
+ flex_array_free(ret);
+ return NULL;
+ }
+ return ret;
}
static int resize_stripes(struct r5conf *conf, int newsize)
@@ -1896,16 +2175,16 @@ static int resize_stripes(struct r5conf *conf, int newsize)
err = -ENOMEM;
get_online_cpus();
- conf->scribble_len = scribble_len(newsize);
for_each_present_cpu(cpu) {
struct raid5_percpu *percpu;
- void *scribble;
+ struct flex_array *scribble;
percpu = per_cpu_ptr(conf->percpu, cpu);
- scribble = kmalloc(conf->scribble_len, GFP_NOIO);
+ scribble = scribble_alloc(newsize, conf->chunk_sectors /
+ STRIPE_SECTORS, GFP_NOIO);
if (scribble) {
- kfree(percpu->scribble);
+ flex_array_free(percpu->scribble);
percpu->scribble = scribble;
} else {
err = -ENOMEM;
@@ -1937,9 +2216,10 @@ static int resize_stripes(struct r5conf *conf, int newsize)
return err;
}
-static int drop_one_stripe(struct r5conf *conf, int hash)
+static int drop_one_stripe(struct r5conf *conf)
{
struct stripe_head *sh;
+ int hash = (conf->max_nr_stripes - 1) % NR_STRIPE_HASH_LOCKS;
spin_lock_irq(conf->hash_locks + hash);
sh = get_free_stripe(conf, hash);
@@ -1950,15 +2230,15 @@ static int drop_one_stripe(struct r5conf *conf, int hash)
shrink_buffers(sh);
kmem_cache_free(conf->slab_cache, sh);
atomic_dec(&conf->active_stripes);
+ conf->max_nr_stripes--;
return 1;
}
static void shrink_stripes(struct r5conf *conf)
{
- int hash;
- for (hash = 0; hash < NR_STRIPE_HASH_LOCKS; hash++)
- while (drop_one_stripe(conf, hash))
- ;
+ while (conf->max_nr_stripes &&
+ drop_one_stripe(conf))
+ ;
if (conf->slab_cache)
kmem_cache_destroy(conf->slab_cache);
@@ -2154,10 +2434,16 @@ static void raid5_end_write_request(struct bio *bi, int error)
}
rdev_dec_pending(rdev, conf->mddev);
+ if (sh->batch_head && !uptodate)
+ set_bit(STRIPE_BATCH_ERR, &sh->batch_head->state);
+
if (!test_and_clear_bit(R5_DOUBLE_LOCKED, &sh->dev[i].flags))
clear_bit(R5_LOCKED, &sh->dev[i].flags);
set_bit(STRIPE_HANDLE, &sh->state);
release_stripe(sh);
+
+ if (sh->batch_head && sh != sh->batch_head)
+ release_stripe(sh->batch_head);
}
static sector_t compute_blocknr(struct stripe_head *sh, int i, int previous);
@@ -2535,7 +2821,7 @@ static void
schedule_reconstruction(struct stripe_head *sh, struct stripe_head_state *s,
int rcw, int expand)
{
- int i, pd_idx = sh->pd_idx, disks = sh->disks;
+ int i, pd_idx = sh->pd_idx, qd_idx = sh->qd_idx, disks = sh->disks;
struct r5conf *conf = sh->raid_conf;
int level = conf->level;
@@ -2571,13 +2857,15 @@ schedule_reconstruction(struct stripe_head *sh, struct stripe_head_state *s,
if (!test_and_set_bit(STRIPE_FULL_WRITE, &sh->state))
atomic_inc(&conf->pending_full_writes);
} else {
- BUG_ON(level == 6);
BUG_ON(!(test_bit(R5_UPTODATE, &sh->dev[pd_idx].flags) ||
test_bit(R5_Wantcompute, &sh->dev[pd_idx].flags)));
+ BUG_ON(level == 6 &&
+ (!(test_bit(R5_UPTODATE, &sh->dev[qd_idx].flags) ||
+ test_bit(R5_Wantcompute, &sh->dev[qd_idx].flags))));
for (i = disks; i--; ) {
struct r5dev *dev = &sh->dev[i];
- if (i == pd_idx)
+ if (i == pd_idx || i == qd_idx)
continue;
if (dev->towrite &&
@@ -2624,7 +2912,8 @@ schedule_reconstruction(struct stripe_head *sh, struct stripe_head_state *s,
* toread/towrite point to the first in a chain.
* The bi_next chain must be in order.
*/
-static int add_stripe_bio(struct stripe_head *sh, struct bio *bi, int dd_idx, int forwrite)
+static int add_stripe_bio(struct stripe_head *sh, struct bio *bi, int dd_idx,
+ int forwrite, int previous)
{
struct bio **bip;
struct r5conf *conf = sh->raid_conf;
@@ -2643,6 +2932,9 @@ static int add_stripe_bio(struct stripe_head *sh, struct bio *bi, int dd_idx, in
* protect it.
*/
spin_lock_irq(&sh->stripe_lock);
+ /* Don't allow new IO added to stripes in batch list */
+ if (sh->batch_head)
+ goto overlap;
if (forwrite) {
bip = &sh->dev[dd_idx].towrite;
if (*bip == NULL)
@@ -2657,6 +2949,9 @@ static int add_stripe_bio(struct stripe_head *sh, struct bio *bi, int dd_idx, in
if (*bip && (*bip)->bi_iter.bi_sector < bio_end_sector(bi))
goto overlap;
+ if (!forwrite || previous)
+ clear_bit(STRIPE_BATCH_READY, &sh->state);
+
BUG_ON(*bip && bi->bi_next && (*bip) != bi->bi_next);
if (*bip)
bi->bi_next = *bip;
@@ -2674,7 +2969,8 @@ static int add_stripe_bio(struct stripe_head *sh, struct bio *bi, int dd_idx, in
sector = bio_end_sector(bi);
}
if (sector >= sh->dev[dd_idx].sector + STRIPE_SECTORS)
- set_bit(R5_OVERWRITE, &sh->dev[dd_idx].flags);
+ if (!test_and_set_bit(R5_OVERWRITE, &sh->dev[dd_idx].flags))
+ sh->overwrite_disks++;
}
pr_debug("added bi b#%llu to stripe s#%llu, disk %d.\n",
@@ -2688,6 +2984,9 @@ static int add_stripe_bio(struct stripe_head *sh, struct bio *bi, int dd_idx, in
sh->bm_seq = conf->seq_flush+1;
set_bit(STRIPE_BIT_DELAY, &sh->state);
}
+
+ if (stripe_can_batch(sh))
+ stripe_add_to_batch_list(conf, sh);
return 1;
overlap:
@@ -2720,6 +3019,7 @@ handle_failed_stripe(struct r5conf *conf, struct stripe_head *sh,
struct bio **return_bi)
{
int i;
+ BUG_ON(sh->batch_head);
for (i = disks; i--; ) {
struct bio *bi;
int bitmap_end = 0;
@@ -2746,6 +3046,7 @@ handle_failed_stripe(struct r5conf *conf, struct stripe_head *sh,
/* fail all writes first */
bi = sh->dev[i].towrite;
sh->dev[i].towrite = NULL;
+ sh->overwrite_disks = 0;
spin_unlock_irq(&sh->stripe_lock);
if (bi)
bitmap_end = 1;
@@ -2834,6 +3135,7 @@ handle_failed_sync(struct r5conf *conf, struct stripe_head *sh,
int abort = 0;
int i;
+ BUG_ON(sh->batch_head);
clear_bit(STRIPE_SYNCING, &sh->state);
if (test_and_clear_bit(R5_Overlap, &sh->dev[sh->pd_idx].flags))
wake_up(&conf->wait_for_overlap);
@@ -3064,6 +3366,7 @@ static void handle_stripe_fill(struct stripe_head *sh,
{
int i;
+ BUG_ON(sh->batch_head);
/* look for blocks to read/compute, skip this if a compute
* is already in flight, or if the stripe contents are in the
* midst of changing due to a write
@@ -3087,6 +3390,9 @@ static void handle_stripe_clean_event(struct r5conf *conf,
int i;
struct r5dev *dev;
int discard_pending = 0;
+ struct stripe_head *head_sh = sh;
+ bool do_endio = false;
+ int wakeup_nr = 0;
for (i = disks; i--; )
if (sh->dev[i].written) {
@@ -3102,8 +3408,11 @@ static void handle_stripe_clean_event(struct r5conf *conf,
clear_bit(R5_UPTODATE, &dev->flags);
if (test_and_clear_bit(R5_SkipCopy, &dev->flags)) {
WARN_ON(test_bit(R5_UPTODATE, &dev->flags));
- dev->page = dev->orig_page;
}
+ do_endio = true;
+
+returnbi:
+ dev->page = dev->orig_page;
wbi = dev->written;
dev->written = NULL;
while (wbi && wbi->bi_iter.bi_sector <
@@ -3120,6 +3429,17 @@ static void handle_stripe_clean_event(struct r5conf *conf,
STRIPE_SECTORS,
!test_bit(STRIPE_DEGRADED, &sh->state),
0);
+ if (head_sh->batch_head) {
+ sh = list_first_entry(&sh->batch_list,
+ struct stripe_head,
+ batch_list);
+ if (sh != head_sh) {
+ dev = &sh->dev[i];
+ goto returnbi;
+ }
+ }
+ sh = head_sh;
+ dev = &sh->dev[i];
} else if (test_bit(R5_Discard, &dev->flags))
discard_pending = 1;
WARN_ON(test_bit(R5_SkipCopy, &dev->flags));
@@ -3141,8 +3461,17 @@ static void handle_stripe_clean_event(struct r5conf *conf,
* will be reinitialized
*/
spin_lock_irq(&conf->device_lock);
+unhash:
remove_hash(sh);
+ if (head_sh->batch_head) {
+ sh = list_first_entry(&sh->batch_list,
+ struct stripe_head, batch_list);
+ if (sh != head_sh)
+ goto unhash;
+ }
spin_unlock_irq(&conf->device_lock);
+ sh = head_sh;
+
if (test_bit(STRIPE_SYNC_REQUESTED, &sh->state))
set_bit(STRIPE_HANDLE, &sh->state);
@@ -3151,6 +3480,45 @@ static void handle_stripe_clean_event(struct r5conf *conf,
if (test_and_clear_bit(STRIPE_FULL_WRITE, &sh->state))
if (atomic_dec_and_test(&conf->pending_full_writes))
md_wakeup_thread(conf->mddev->thread);
+
+ if (!head_sh->batch_head || !do_endio)
+ return;
+ for (i = 0; i < head_sh->disks; i++) {
+ if (test_and_clear_bit(R5_Overlap, &head_sh->dev[i].flags))
+ wakeup_nr++;
+ }
+ while (!list_empty(&head_sh->batch_list)) {
+ int i;
+ sh = list_first_entry(&head_sh->batch_list,
+ struct stripe_head, batch_list);
+ list_del_init(&sh->batch_list);
+
+ set_mask_bits(&sh->state, ~STRIPE_EXPAND_SYNC_FLAG,
+ head_sh->state & ~((1 << STRIPE_ACTIVE) |
+ (1 << STRIPE_PREREAD_ACTIVE) |
+ STRIPE_EXPAND_SYNC_FLAG));
+ sh->check_state = head_sh->check_state;
+ sh->reconstruct_state = head_sh->reconstruct_state;
+ for (i = 0; i < sh->disks; i++) {
+ if (test_and_clear_bit(R5_Overlap, &sh->dev[i].flags))
+ wakeup_nr++;
+ sh->dev[i].flags = head_sh->dev[i].flags;
+ }
+
+ spin_lock_irq(&sh->stripe_lock);
+ sh->batch_head = NULL;
+ spin_unlock_irq(&sh->stripe_lock);
+ if (sh->state & STRIPE_EXPAND_SYNC_FLAG)
+ set_bit(STRIPE_HANDLE, &sh->state);
+ release_stripe(sh);
+ }
+
+ spin_lock_irq(&head_sh->stripe_lock);
+ head_sh->batch_head = NULL;
+ spin_unlock_irq(&head_sh->stripe_lock);
+ wake_up_nr(&conf->wait_for_overlap, wakeup_nr);
+ if (head_sh->state & STRIPE_EXPAND_SYNC_FLAG)
+ set_bit(STRIPE_HANDLE, &head_sh->state);
}
static void handle_stripe_dirtying(struct r5conf *conf,
@@ -3161,28 +3529,27 @@ static void handle_stripe_dirtying(struct r5conf *conf,
int rmw = 0, rcw = 0, i;
sector_t recovery_cp = conf->mddev->recovery_cp;
- /* RAID6 requires 'rcw' in current implementation.
- * Otherwise, check whether resync is now happening or should start.
+ /* Check whether resync is now happening or should start.
* If yes, then the array is dirty (after unclean shutdown or
* initial creation), so parity in some stripes might be inconsistent.
* In this case, we need to always do reconstruct-write, to ensure
* that in case of drive failure or read-error correction, we
* generate correct data from the parity.
*/
- if (conf->max_degraded == 2 ||
+ if (conf->rmw_level == PARITY_DISABLE_RMW ||
(recovery_cp < MaxSector && sh->sector >= recovery_cp &&
s->failed == 0)) {
/* Calculate the real rcw later - for now make it
* look like rcw is cheaper
*/
rcw = 1; rmw = 2;
- pr_debug("force RCW max_degraded=%u, recovery_cp=%llu sh->sector=%llu\n",
- conf->max_degraded, (unsigned long long)recovery_cp,
+ pr_debug("force RCW rmw_level=%u, recovery_cp=%llu sh->sector=%llu\n",
+ conf->rmw_level, (unsigned long long)recovery_cp,
(unsigned long long)sh->sector);
} else for (i = disks; i--; ) {
/* would I have to read this buffer for read_modify_write */
struct r5dev *dev = &sh->dev[i];
- if ((dev->towrite || i == sh->pd_idx) &&
+ if ((dev->towrite || i == sh->pd_idx || i == sh->qd_idx) &&
!test_bit(R5_LOCKED, &dev->flags) &&
!(test_bit(R5_UPTODATE, &dev->flags) ||
test_bit(R5_Wantcompute, &dev->flags))) {
@@ -3192,7 +3559,8 @@ static void handle_stripe_dirtying(struct r5conf *conf,
rmw += 2*disks; /* cannot read it */
}
/* Would I have to read this buffer for reconstruct_write */
- if (!test_bit(R5_OVERWRITE, &dev->flags) && i != sh->pd_idx &&
+ if (!test_bit(R5_OVERWRITE, &dev->flags) &&
+ i != sh->pd_idx && i != sh->qd_idx &&
!test_bit(R5_LOCKED, &dev->flags) &&
!(test_bit(R5_UPTODATE, &dev->flags) ||
test_bit(R5_Wantcompute, &dev->flags))) {
@@ -3205,7 +3573,7 @@ static void handle_stripe_dirtying(struct r5conf *conf,
pr_debug("for sector %llu, rmw=%d rcw=%d\n",
(unsigned long long)sh->sector, rmw, rcw);
set_bit(STRIPE_HANDLE, &sh->state);
- if (rmw < rcw && rmw > 0) {
+ if ((rmw < rcw || (rmw == rcw && conf->rmw_level == PARITY_ENABLE_RMW)) && rmw > 0) {
/* prefer read-modify-write, but need to get some data */
if (conf->mddev->queue)
blk_add_trace_msg(conf->mddev->queue,
@@ -3213,7 +3581,7 @@ static void handle_stripe_dirtying(struct r5conf *conf,
(unsigned long long)sh->sector, rmw);
for (i = disks; i--; ) {
struct r5dev *dev = &sh->dev[i];
- if ((dev->towrite || i == sh->pd_idx) &&
+ if ((dev->towrite || i == sh->pd_idx || i == sh->qd_idx) &&
!test_bit(R5_LOCKED, &dev->flags) &&
!(test_bit(R5_UPTODATE, &dev->flags) ||
test_bit(R5_Wantcompute, &dev->flags)) &&
@@ -3232,7 +3600,7 @@ static void handle_stripe_dirtying(struct r5conf *conf,
}
}
}
- if (rcw <= rmw && rcw > 0) {
+ if ((rcw < rmw || (rcw == rmw && conf->rmw_level != PARITY_ENABLE_RMW)) && rcw > 0) {
/* want reconstruct write, but need to get some data */
int qread =0;
rcw = 0;
@@ -3290,6 +3658,7 @@ static void handle_parity_checks5(struct r5conf *conf, struct stripe_head *sh,
{
struct r5dev *dev = NULL;
+ BUG_ON(sh->batch_head);
set_bit(STRIPE_HANDLE, &sh->state);
switch (sh->check_state) {
@@ -3380,6 +3749,7 @@ static void handle_parity_checks6(struct r5conf *conf, struct stripe_head *sh,
int qd_idx = sh->qd_idx;
struct r5dev *dev;
+ BUG_ON(sh->batch_head);
set_bit(STRIPE_HANDLE, &sh->state);
BUG_ON(s->failed > 2);
@@ -3543,6 +3913,7 @@ static void handle_stripe_expansion(struct r5conf *conf, struct stripe_head *sh)
* copy some of them into a target stripe for expand.
*/
struct dma_async_tx_descriptor *tx = NULL;
+ BUG_ON(sh->batch_head);
clear_bit(STRIPE_EXPAND_SOURCE, &sh->state);
for (i = 0; i < sh->disks; i++)
if (i != sh->pd_idx && i != sh->qd_idx) {
@@ -3615,8 +3986,8 @@ static void analyse_stripe(struct stripe_head *sh, struct stripe_head_state *s)
memset(s, 0, sizeof(*s));
- s->expanding = test_bit(STRIPE_EXPAND_SOURCE, &sh->state);
- s->expanded = test_bit(STRIPE_EXPAND_READY, &sh->state);
+ s->expanding = test_bit(STRIPE_EXPAND_SOURCE, &sh->state) && !sh->batch_head;
+ s->expanded = test_bit(STRIPE_EXPAND_READY, &sh->state) && !sh->batch_head;
s->failed_num[0] = -1;
s->failed_num[1] = -1;
@@ -3786,6 +4157,80 @@ static void analyse_stripe(struct stripe_head *sh, struct stripe_head_state *s)
rcu_read_unlock();
}
+static int clear_batch_ready(struct stripe_head *sh)
+{
+ struct stripe_head *tmp;
+ if (!test_and_clear_bit(STRIPE_BATCH_READY, &sh->state))
+ return 0;
+ spin_lock(&sh->stripe_lock);
+ if (!sh->batch_head) {
+ spin_unlock(&sh->stripe_lock);
+ return 0;
+ }
+
+ /*
+ * this stripe could be added to a batch list before we check
+ * BATCH_READY, skips it
+ */
+ if (sh->batch_head != sh) {
+ spin_unlock(&sh->stripe_lock);
+ return 1;
+ }
+ spin_lock(&sh->batch_lock);
+ list_for_each_entry(tmp, &sh->batch_list, batch_list)
+ clear_bit(STRIPE_BATCH_READY, &tmp->state);
+ spin_unlock(&sh->batch_lock);
+ spin_unlock(&sh->stripe_lock);
+
+ /*
+ * BATCH_READY is cleared, no new stripes can be added.
+ * batch_list can be accessed without lock
+ */
+ return 0;
+}
+
+static void check_break_stripe_batch_list(struct stripe_head *sh)
+{
+ struct stripe_head *head_sh, *next;
+ int i;
+
+ if (!test_and_clear_bit(STRIPE_BATCH_ERR, &sh->state))
+ return;
+
+ head_sh = sh;
+ do {
+ sh = list_first_entry(&sh->batch_list,
+ struct stripe_head, batch_list);
+ BUG_ON(sh == head_sh);
+ } while (!test_bit(STRIPE_DEGRADED, &sh->state));
+
+ while (sh != head_sh) {
+ next = list_first_entry(&sh->batch_list,
+ struct stripe_head, batch_list);
+ list_del_init(&sh->batch_list);
+
+ set_mask_bits(&sh->state, ~STRIPE_EXPAND_SYNC_FLAG,
+ head_sh->state & ~((1 << STRIPE_ACTIVE) |
+ (1 << STRIPE_PREREAD_ACTIVE) |
+ (1 << STRIPE_DEGRADED) |
+ STRIPE_EXPAND_SYNC_FLAG));
+ sh->check_state = head_sh->check_state;
+ sh->reconstruct_state = head_sh->reconstruct_state;
+ for (i = 0; i < sh->disks; i++)
+ sh->dev[i].flags = head_sh->dev[i].flags &
+ (~((1 << R5_WriteError) | (1 << R5_Overlap)));
+
+ spin_lock_irq(&sh->stripe_lock);
+ sh->batch_head = NULL;
+ spin_unlock_irq(&sh->stripe_lock);
+
+ set_bit(STRIPE_HANDLE, &sh->state);
+ release_stripe(sh);
+
+ sh = next;
+ }
+}
+
static void handle_stripe(struct stripe_head *sh)
{
struct stripe_head_state s;
@@ -3803,7 +4248,14 @@ static void handle_stripe(struct stripe_head *sh)
return;
}
- if (test_bit(STRIPE_SYNC_REQUESTED, &sh->state)) {
+ if (clear_batch_ready(sh) ) {
+ clear_bit_unlock(STRIPE_ACTIVE, &sh->state);
+ return;
+ }
+
+ check_break_stripe_batch_list(sh);
+
+ if (test_bit(STRIPE_SYNC_REQUESTED, &sh->state) && !sh->batch_head) {
spin_lock(&sh->stripe_lock);
/* Cannot process 'sync' concurrently with 'discard' */
if (!test_bit(STRIPE_DISCARD, &sh->state) &&
@@ -4158,7 +4610,7 @@ static int raid5_congested(struct mddev *mddev, int bits)
* how busy the stripe_cache is
*/
- if (conf->inactive_blocked)
+ if (test_bit(R5_INACTIVE_BLOCKED, &conf->cache_state))
return 1;
if (conf->quiesce)
return 1;
@@ -4180,8 +4632,12 @@ static int raid5_mergeable_bvec(struct mddev *mddev,
unsigned int chunk_sectors = mddev->chunk_sectors;
unsigned int bio_sectors = bvm->bi_size >> 9;
- if ((bvm->bi_rw & 1) == WRITE)
- return biovec->bv_len; /* always allow writes to be mergeable */
+ /*
+ * always allow writes to be mergeable, read as well if array
+ * is degraded as we'll go through stripe cache anyway.
+ */
+ if ((bvm->bi_rw & 1) == WRITE || mddev->degraded)
+ return biovec->bv_len;
if (mddev->new_chunk_sectors < mddev->chunk_sectors)
chunk_sectors = mddev->new_chunk_sectors;
@@ -4603,12 +5059,14 @@ static void make_discard_request(struct mddev *mddev, struct bio *bi)
}
set_bit(STRIPE_DISCARD, &sh->state);
finish_wait(&conf->wait_for_overlap, &w);
+ sh->overwrite_disks = 0;
for (d = 0; d < conf->raid_disks; d++) {
if (d == sh->pd_idx || d == sh->qd_idx)
continue;
sh->dev[d].towrite = bi;
set_bit(R5_OVERWRITE, &sh->dev[d].flags);
raid5_inc_bi_active_stripes(bi);
+ sh->overwrite_disks++;
}
spin_unlock_irq(&sh->stripe_lock);
if (conf->mddev->bitmap) {
@@ -4656,7 +5114,12 @@ static void make_request(struct mddev *mddev, struct bio * bi)
md_write_start(mddev, bi);
- if (rw == READ &&
+ /*
+ * If array is degraded, better not do chunk aligned read because
+ * later we might have to read it again in order to reconstruct
+ * data on failed drives.
+ */
+ if (rw == READ && mddev->degraded == 0 &&
mddev->reshape_position == MaxSector &&
chunk_aligned_read(mddev,bi))
return;
@@ -4772,7 +5235,7 @@ static void make_request(struct mddev *mddev, struct bio * bi)
}
if (test_bit(STRIPE_EXPANDING, &sh->state) ||
- !add_stripe_bio(sh, bi, dd_idx, rw)) {
+ !add_stripe_bio(sh, bi, dd_idx, rw, previous)) {
/* Stripe is busy expanding or
* add failed due to overlap. Flush everything
* and wait a while
@@ -4785,7 +5248,8 @@ static void make_request(struct mddev *mddev, struct bio * bi)
}
set_bit(STRIPE_HANDLE, &sh->state);
clear_bit(STRIPE_DELAYED, &sh->state);
- if ((bi->bi_rw & REQ_SYNC) &&
+ if ((!sh->batch_head || sh == sh->batch_head) &&
+ (bi->bi_rw & REQ_SYNC) &&
!test_and_set_bit(STRIPE_PREREAD_ACTIVE, &sh->state))
atomic_inc(&conf->preread_active_stripes);
release_stripe_plug(mddev, sh);
@@ -5050,8 +5514,7 @@ ret:
return reshape_sectors;
}
-/* FIXME go_faster isn't used */
-static inline sector_t sync_request(struct mddev *mddev, sector_t sector_nr, int *skipped, int go_faster)
+static inline sector_t sync_request(struct mddev *mddev, sector_t sector_nr, int *skipped)
{
struct r5conf *conf = mddev->private;
struct stripe_head *sh;
@@ -5186,7 +5649,7 @@ static int retry_aligned_read(struct r5conf *conf, struct bio *raid_bio)
return handled;
}
- if (!add_stripe_bio(sh, raid_bio, dd_idx, 0)) {
+ if (!add_stripe_bio(sh, raid_bio, dd_idx, 0, 0)) {
release_stripe(sh);
raid5_set_bi_processed_stripes(raid_bio, scnt);
conf->retry_read_aligned = raid_bio;
@@ -5312,6 +5775,8 @@ static void raid5d(struct md_thread *thread)
int batch_size, released;
released = release_stripe_list(conf, conf->temp_inactive_list);
+ if (released)
+ clear_bit(R5_DID_ALLOC, &conf->cache_state);
if (
!list_empty(&conf->bitmap_list)) {
@@ -5350,6 +5815,13 @@ static void raid5d(struct md_thread *thread)
pr_debug("%d stripes handled\n", handled);
spin_unlock_irq(&conf->device_lock);
+ if (test_and_clear_bit(R5_ALLOC_MORE, &conf->cache_state)) {
+ grow_one_stripe(conf, __GFP_NOWARN);
+ /* Set flag even if allocation failed. This helps
+ * slow down allocation requests when mem is short
+ */
+ set_bit(R5_DID_ALLOC, &conf->cache_state);
+ }
async_tx_issue_pending_all();
blk_finish_plug(&plug);
@@ -5365,7 +5837,7 @@ raid5_show_stripe_cache_size(struct mddev *mddev, char *page)
spin_lock(&mddev->lock);
conf = mddev->private;
if (conf)
- ret = sprintf(page, "%d\n", conf->max_nr_stripes);
+ ret = sprintf(page, "%d\n", conf->min_nr_stripes);
spin_unlock(&mddev->lock);
return ret;
}
@@ -5375,30 +5847,24 @@ raid5_set_cache_size(struct mddev *mddev, int size)
{
struct r5conf *conf = mddev->private;
int err;
- int hash;
if (size <= 16 || size > 32768)
return -EINVAL;
- hash = (conf->max_nr_stripes - 1) % NR_STRIPE_HASH_LOCKS;
- while (size < conf->max_nr_stripes) {
- if (drop_one_stripe(conf, hash))
- conf->max_nr_stripes--;
- else
- break;
- hash--;
- if (hash < 0)
- hash = NR_STRIPE_HASH_LOCKS - 1;
- }
+
+ conf->min_nr_stripes = size;
+ while (size < conf->max_nr_stripes &&
+ drop_one_stripe(conf))
+ ;
+
+
err = md_allow_write(mddev);
if (err)
return err;
- hash = conf->max_nr_stripes % NR_STRIPE_HASH_LOCKS;
- while (size > conf->max_nr_stripes) {
- if (grow_one_stripe(conf, hash))
- conf->max_nr_stripes++;
- else break;
- hash = (hash + 1) % NR_STRIPE_HASH_LOCKS;
- }
+
+ while (size > conf->max_nr_stripes)
+ if (!grow_one_stripe(conf, GFP_KERNEL))
+ break;
+
return 0;
}
EXPORT_SYMBOL(raid5_set_cache_size);
@@ -5433,6 +5899,49 @@ raid5_stripecache_size = __ATTR(stripe_cache_size, S_IRUGO | S_IWUSR,
raid5_store_stripe_cache_size);
static ssize_t
+raid5_show_rmw_level(struct mddev *mddev, char *page)
+{
+ struct r5conf *conf = mddev->private;
+ if (conf)
+ return sprintf(page, "%d\n", conf->rmw_level);
+ else
+ return 0;
+}
+
+static ssize_t
+raid5_store_rmw_level(struct mddev *mddev, const char *page, size_t len)
+{
+ struct r5conf *conf = mddev->private;
+ unsigned long new;
+
+ if (!conf)
+ return -ENODEV;
+
+ if (len >= PAGE_SIZE)
+ return -EINVAL;
+
+ if (kstrtoul(page, 10, &new))
+ return -EINVAL;
+
+ if (new != PARITY_DISABLE_RMW && !raid6_call.xor_syndrome)
+ return -EINVAL;
+
+ if (new != PARITY_DISABLE_RMW &&
+ new != PARITY_ENABLE_RMW &&
+ new != PARITY_PREFER_RMW)
+ return -EINVAL;
+
+ conf->rmw_level = new;
+ return len;
+}
+
+static struct md_sysfs_entry
+raid5_rmw_level = __ATTR(rmw_level, S_IRUGO | S_IWUSR,
+ raid5_show_rmw_level,
+ raid5_store_rmw_level);
+
+
+static ssize_t
raid5_show_preread_threshold(struct mddev *mddev, char *page)
{
struct r5conf *conf;
@@ -5463,7 +5972,7 @@ raid5_store_preread_threshold(struct mddev *mddev, const char *page, size_t len)
conf = mddev->private;
if (!conf)
err = -ENODEV;
- else if (new > conf->max_nr_stripes)
+ else if (new > conf->min_nr_stripes)
err = -EINVAL;
else
conf->bypass_threshold = new;
@@ -5618,6 +6127,7 @@ static struct attribute *raid5_attrs[] = {
&raid5_preread_bypass_threshold.attr,
&raid5_group_thread_cnt.attr,
&raid5_skip_copy.attr,
+ &raid5_rmw_level.attr,
NULL,
};
static struct attribute_group raid5_attrs_group = {
@@ -5699,7 +6209,8 @@ raid5_size(struct mddev *mddev, sector_t sectors, int raid_disks)
static void free_scratch_buffer(struct r5conf *conf, struct raid5_percpu *percpu)
{
safe_put_page(percpu->spare_page);
- kfree(percpu->scribble);
+ if (percpu->scribble)
+ flex_array_free(percpu->scribble);
percpu->spare_page = NULL;
percpu->scribble = NULL;
}
@@ -5709,7 +6220,9 @@ static int alloc_scratch_buffer(struct r5conf *conf, struct raid5_percpu *percpu
if (conf->level == 6 && !percpu->spare_page)
percpu->spare_page = alloc_page(GFP_KERNEL);
if (!percpu->scribble)
- percpu->scribble = kmalloc(conf->scribble_len, GFP_KERNEL);
+ percpu->scribble = scribble_alloc(max(conf->raid_disks,
+ conf->previous_raid_disks), conf->chunk_sectors /
+ STRIPE_SECTORS, GFP_KERNEL);
if (!percpu->scribble || (conf->level == 6 && !percpu->spare_page)) {
free_scratch_buffer(conf, percpu);
@@ -5740,6 +6253,8 @@ static void raid5_free_percpu(struct r5conf *conf)
static void free_conf(struct r5conf *conf)
{
+ if (conf->shrinker.seeks)
+ unregister_shrinker(&conf->shrinker);
free_thread_groups(conf);
shrink_stripes(conf);
raid5_free_percpu(conf);
@@ -5807,6 +6322,30 @@ static int raid5_alloc_percpu(struct r5conf *conf)
return err;
}
+static unsigned long raid5_cache_scan(struct shrinker *shrink,
+ struct shrink_control *sc)
+{
+ struct r5conf *conf = container_of(shrink, struct r5conf, shrinker);
+ int ret = 0;
+ while (ret < sc->nr_to_scan) {
+ if (drop_one_stripe(conf) == 0)
+ return SHRINK_STOP;
+ ret++;
+ }
+ return ret;
+}
+
+static unsigned long raid5_cache_count(struct shrinker *shrink,
+ struct shrink_control *sc)
+{
+ struct r5conf *conf = container_of(shrink, struct r5conf, shrinker);
+
+ if (conf->max_nr_stripes < conf->min_nr_stripes)
+ /* unlikely, but not impossible */
+ return 0;
+ return conf->max_nr_stripes - conf->min_nr_stripes;
+}
+
static struct r5conf *setup_conf(struct mddev *mddev)
{
struct r5conf *conf;
@@ -5879,7 +6418,6 @@ static struct r5conf *setup_conf(struct mddev *mddev)
else
conf->previous_raid_disks = mddev->raid_disks - mddev->delta_disks;
max_disks = max(conf->raid_disks, conf->previous_raid_disks);
- conf->scribble_len = scribble_len(max_disks);
conf->disks = kzalloc(max_disks * sizeof(struct disk_info),
GFP_KERNEL);
@@ -5907,6 +6445,7 @@ static struct r5conf *setup_conf(struct mddev *mddev)
INIT_LIST_HEAD(conf->temp_inactive_list + i);
conf->level = mddev->new_level;
+ conf->chunk_sectors = mddev->new_chunk_sectors;
if (raid5_alloc_percpu(conf) != 0)
goto abort;
@@ -5939,12 +6478,17 @@ static struct r5conf *setup_conf(struct mddev *mddev)
conf->fullsync = 1;
}
- conf->chunk_sectors = mddev->new_chunk_sectors;
conf->level = mddev->new_level;
- if (conf->level == 6)
+ if (conf->level == 6) {
conf->max_degraded = 2;
- else
+ if (raid6_call.xor_syndrome)
+ conf->rmw_level = PARITY_ENABLE_RMW;
+ else
+ conf->rmw_level = PARITY_DISABLE_RMW;
+ } else {
conf->max_degraded = 1;
+ conf->rmw_level = PARITY_ENABLE_RMW;
+ }
conf->algorithm = mddev->new_layout;
conf->reshape_progress = mddev->reshape_position;
if (conf->reshape_progress != MaxSector) {
@@ -5952,10 +6496,11 @@ static struct r5conf *setup_conf(struct mddev *mddev)
conf->prev_algo = mddev->layout;
}
- memory = conf->max_nr_stripes * (sizeof(struct stripe_head) +
+ conf->min_nr_stripes = NR_STRIPES;
+ memory = conf->min_nr_stripes * (sizeof(struct stripe_head) +
max_disks * ((sizeof(struct bio) + PAGE_SIZE))) / 1024;
atomic_set(&conf->empty_inactive_list_nr, NR_STRIPE_HASH_LOCKS);
- if (grow_stripes(conf, NR_STRIPES)) {
+ if (grow_stripes(conf, conf->min_nr_stripes)) {
printk(KERN_ERR
"md/raid:%s: couldn't allocate %dkB for buffers\n",
mdname(mddev), memory);
@@ -5963,6 +6508,17 @@ static struct r5conf *setup_conf(struct mddev *mddev)
} else
printk(KERN_INFO "md/raid:%s: allocated %dkB\n",
mdname(mddev), memory);
+ /*
+ * Losing a stripe head costs more than the time to refill it,
+ * it reduces the queue depth and so can hurt throughput.
+ * So set it rather large, scaled by number of devices.
+ */
+ conf->shrinker.seeks = DEFAULT_SEEKS * conf->raid_disks * 4;
+ conf->shrinker.scan_objects = raid5_cache_scan;
+ conf->shrinker.count_objects = raid5_cache_count;
+ conf->shrinker.batch = 128;
+ conf->shrinker.flags = 0;
+ register_shrinker(&conf->shrinker);
sprintf(pers_name, "raid%d", mddev->new_level);
conf->thread = md_register_thread(raid5d, mddev, pers_name);
@@ -6604,9 +7160,9 @@ static int check_stripe_cache(struct mddev *mddev)
*/
struct r5conf *conf = mddev->private;
if (((mddev->chunk_sectors << 9) / STRIPE_SIZE) * 4
- > conf->max_nr_stripes ||
+ > conf->min_nr_stripes ||
((mddev->new_chunk_sectors << 9) / STRIPE_SIZE) * 4
- > conf->max_nr_stripes) {
+ > conf->min_nr_stripes) {
printk(KERN_WARNING "md/raid:%s: reshape: not enough stripes. Needed %lu\n",
mdname(mddev),
((max(mddev->chunk_sectors, mddev->new_chunk_sectors) << 9)
diff --git a/drivers/md/raid5.h b/drivers/md/raid5.h
index 983e18a83db1..7dc0dd86074b 100644
--- a/drivers/md/raid5.h
+++ b/drivers/md/raid5.h
@@ -210,11 +210,19 @@ struct stripe_head {
atomic_t count; /* nr of active thread/requests */
int bm_seq; /* sequence number for bitmap flushes */
int disks; /* disks in stripe */
+ int overwrite_disks; /* total overwrite disks in stripe,
+ * this is only checked when stripe
+ * has STRIPE_BATCH_READY
+ */
enum check_states check_state;
enum reconstruct_states reconstruct_state;
spinlock_t stripe_lock;
int cpu;
struct r5worker_group *group;
+
+ struct stripe_head *batch_head; /* protected by stripe lock */
+ spinlock_t batch_lock; /* only header's lock is useful */
+ struct list_head batch_list; /* protected by head's batch lock*/
/**
* struct stripe_operations
* @target - STRIPE_OP_COMPUTE_BLK target
@@ -327,8 +335,15 @@ enum {
STRIPE_ON_UNPLUG_LIST,
STRIPE_DISCARD,
STRIPE_ON_RELEASE_LIST,
+ STRIPE_BATCH_READY,
+ STRIPE_BATCH_ERR,
};
+#define STRIPE_EXPAND_SYNC_FLAG \
+ ((1 << STRIPE_EXPAND_SOURCE) |\
+ (1 << STRIPE_EXPAND_READY) |\
+ (1 << STRIPE_EXPANDING) |\
+ (1 << STRIPE_SYNC_REQUESTED))
/*
* Operation request flags
*/
@@ -340,6 +355,24 @@ enum {
STRIPE_OP_RECONSTRUCT,
STRIPE_OP_CHECK,
};
+
+/*
+ * RAID parity calculation preferences
+ */
+enum {
+ PARITY_DISABLE_RMW = 0,
+ PARITY_ENABLE_RMW,
+ PARITY_PREFER_RMW,
+};
+
+/*
+ * Pages requested from set_syndrome_sources()
+ */
+enum {
+ SYNDROME_SRC_ALL,
+ SYNDROME_SRC_WANT_DRAIN,
+ SYNDROME_SRC_WRITTEN,
+};
/*
* Plugging:
*
@@ -396,10 +429,11 @@ struct r5conf {
spinlock_t hash_locks[NR_STRIPE_HASH_LOCKS];
struct mddev *mddev;
int chunk_sectors;
- int level, algorithm;
+ int level, algorithm, rmw_level;
int max_degraded;
int raid_disks;
int max_nr_stripes;
+ int min_nr_stripes;
/* reshape_progress is the leading edge of a 'reshape'
* It has value MaxSector when no reshape is happening
@@ -458,15 +492,11 @@ struct r5conf {
/* per cpu variables */
struct raid5_percpu {
struct page *spare_page; /* Used when checking P/Q in raid6 */
- void *scribble; /* space for constructing buffer
+ struct flex_array *scribble; /* space for constructing buffer
* lists and performing address
* conversions
*/
} __percpu *percpu;
- size_t scribble_len; /* size of scribble region must be
- * associated with conf to handle
- * cpu hotplug while reshaping
- */
#ifdef CONFIG_HOTPLUG_CPU
struct notifier_block cpu_notify;
#endif
@@ -480,9 +510,19 @@ struct r5conf {
struct llist_head released_stripes;
wait_queue_head_t wait_for_stripe;
wait_queue_head_t wait_for_overlap;
- int inactive_blocked; /* release of inactive stripes blocked,
- * waiting for 25% to be free
- */
+ unsigned long cache_state;
+#define R5_INACTIVE_BLOCKED 1 /* release of inactive stripes blocked,
+ * waiting for 25% to be free
+ */
+#define R5_ALLOC_MORE 2 /* It might help to allocate another
+ * stripe.
+ */
+#define R5_DID_ALLOC 4 /* A stripe was allocated, don't allocate
+ * more until at least one has been
+ * released. This avoids flooding
+ * the cache.
+ */
+ struct shrinker shrinker;
int pool_size; /* number of disks in stripeheads in pool */
spinlock_t device_lock;
struct disk_info *disks;
@@ -497,6 +537,7 @@ struct r5conf {
int worker_cnt_per_group;
};
+
/*
* Our supported algorithms
*/
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-17 04:38:52 +0000