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Subject[RFC v2 82/83] Failure recovery: Per-CPU recovery.
Date
From: Andiry Xu <jix024@cs.ucsd.edu>

NOVA starts a recovery thread on each CPU, and scans all the inodes
in a parallel way. It recovers the inode inuse list during the
scan as well.

Signed-off-by: Andiry Xu <jix024@cs.ucsd.edu>
---
fs/nova/bbuild.c | 396 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 396 insertions(+)

diff --git a/fs/nova/bbuild.c b/fs/nova/bbuild.c
index 75dfcba..3271166 100644
--- a/fs/nova/bbuild.c
+++ b/fs/nova/bbuild.c
@@ -677,6 +677,11 @@ struct task_ring {
u64 *nvmm_array;
};

+static struct task_ring *task_rings;
+static struct task_struct **threads;
+wait_queue_head_t finish_wq;
+int *finished;
+
static int nova_traverse_inode_log(struct super_block *sb,
struct nova_inode *pi, struct scan_bitmap *bm, u64 head)
{
@@ -973,6 +978,378 @@ static int nova_recover_inode_pages(struct super_block *sb,
}


+static void free_resources(struct super_block *sb)
+{
+ struct nova_sb_info *sbi = NOVA_SB(sb);
+ struct task_ring *ring;
+ int i;
+
+ if (task_rings) {
+ for (i = 0; i < sbi->cpus; i++) {
+ ring = &task_rings[i];
+ vfree(ring->entry_array);
+ vfree(ring->nvmm_array);
+ ring->entry_array = NULL;
+ ring->nvmm_array = NULL;
+ }
+ }
+
+ kfree(task_rings);
+ kfree(threads);
+ kfree(finished);
+}
+
+static int failure_thread_func(void *data);
+
+static int allocate_resources(struct super_block *sb, int cpus)
+{
+ struct task_ring *ring;
+ int i;
+
+ task_rings = kcalloc(cpus, sizeof(struct task_ring), GFP_KERNEL);
+ if (!task_rings)
+ goto fail;
+
+ for (i = 0; i < cpus; i++) {
+ ring = &task_rings[i];
+
+ ring->nvmm_array = vzalloc(sizeof(u64) * MAX_PGOFF);
+ if (!ring->nvmm_array)
+ goto fail;
+
+ ring->entry_array = vmalloc(sizeof(u64) * MAX_PGOFF);
+ if (!ring->entry_array)
+ goto fail;
+ }
+
+ threads = kcalloc(cpus, sizeof(struct task_struct *), GFP_KERNEL);
+ if (!threads)
+ goto fail;
+
+ finished = kcalloc(cpus, sizeof(int), GFP_KERNEL);
+ if (!finished)
+ goto fail;
+
+ init_waitqueue_head(&finish_wq);
+
+ for (i = 0; i < cpus; i++) {
+ threads[i] = kthread_create(failure_thread_func,
+ sb, "recovery thread");
+ kthread_bind(threads[i], i);
+ }
+
+ return 0;
+
+fail:
+ free_resources(sb);
+ return -ENOMEM;
+}
+
+static void wait_to_finish(int cpus)
+{
+ int i;
+
+ for (i = 0; i < cpus; i++) {
+ while (finished[i] == 0) {
+ wait_event_interruptible_timeout(finish_wq, false,
+ msecs_to_jiffies(1));
+ }
+ }
+}
+
+/*********************** Failure recovery *************************/
+
+static int nova_failure_insert_inodetree(struct super_block *sb,
+ unsigned long ino_low, unsigned long ino_high)
+{
+ struct nova_sb_info *sbi = NOVA_SB(sb);
+ struct inode_map *inode_map;
+ struct nova_range_node *prev = NULL, *next = NULL;
+ struct nova_range_node *new_node;
+ unsigned long internal_low, internal_high;
+ int cpu;
+ struct rb_root *tree;
+ int ret;
+
+ if (ino_low > ino_high) {
+ nova_err(sb, "%s: ino low %lu, ino high %lu\n",
+ __func__, ino_low, ino_high);
+ return -EINVAL;
+ }
+
+ cpu = ino_low % sbi->cpus;
+ if (ino_high % sbi->cpus != cpu) {
+ nova_err(sb, "%s: ino low %lu, ino high %lu\n",
+ __func__, ino_low, ino_high);
+ return -EINVAL;
+ }
+
+ internal_low = ino_low / sbi->cpus;
+ internal_high = ino_high / sbi->cpus;
+ inode_map = &sbi->inode_maps[cpu];
+ tree = &inode_map->inode_inuse_tree;
+ mutex_lock(&inode_map->inode_table_mutex);
+
+ ret = nova_find_free_slot(sbi, tree, internal_low, internal_high,
+ &prev, &next);
+ if (ret) {
+ nova_dbg("%s: ino %lu - %lu already exists!: %d\n",
+ __func__, ino_low, ino_high, ret);
+ mutex_unlock(&inode_map->inode_table_mutex);
+ return ret;
+ }
+
+ if (prev && next && (internal_low == prev->range_high + 1) &&
+ (internal_high + 1 == next->range_low)) {
+ /* fits the hole */
+ rb_erase(&next->node, tree);
+ inode_map->num_range_node_inode--;
+ prev->range_high = next->range_high;
+ nova_free_inode_node(sb, next);
+ goto finish;
+ }
+ if (prev && (internal_low == prev->range_high + 1)) {
+ /* Aligns left */
+ prev->range_high += internal_high - internal_low + 1;
+ goto finish;
+ }
+ if (next && (internal_high + 1 == next->range_low)) {
+ /* Aligns right */
+ next->range_low -= internal_high - internal_low + 1;
+ goto finish;
+ }
+
+ /* Aligns somewhere in the middle */
+ new_node = nova_alloc_inode_node(sb);
+ NOVA_ASSERT(new_node);
+ new_node->range_low = internal_low;
+ new_node->range_high = internal_high;
+ ret = nova_insert_inodetree(sbi, new_node, cpu);
+ if (ret) {
+ nova_err(sb, "%s failed\n", __func__);
+ nova_free_inode_node(sb, new_node);
+ goto finish;
+ }
+ inode_map->num_range_node_inode++;
+
+finish:
+ mutex_unlock(&inode_map->inode_table_mutex);
+ return ret;
+}
+
+static inline int nova_failure_update_inodetree(struct super_block *sb,
+ struct nova_inode *pi, unsigned long *ino_low, unsigned long *ino_high)
+{
+ struct nova_sb_info *sbi = NOVA_SB(sb);
+
+ if (*ino_low == 0) {
+ *ino_low = *ino_high = pi->nova_ino;
+ } else {
+ if (pi->nova_ino == *ino_high + sbi->cpus) {
+ *ino_high = pi->nova_ino;
+ } else {
+ /* A new start */
+ nova_failure_insert_inodetree(sb, *ino_low, *ino_high);
+ *ino_low = *ino_high = pi->nova_ino;
+ }
+ }
+
+ return 0;
+}
+
+static int failure_thread_func(void *data)
+{
+ struct super_block *sb = data;
+ struct nova_inode_info_header sih;
+ struct task_ring *ring;
+ struct nova_inode *pi, fake_pi;
+ unsigned long num_inodes_per_page;
+ unsigned long ino_low, ino_high;
+ unsigned long last_blocknr;
+ unsigned int data_bits;
+ u64 curr;
+ int cpuid = smp_processor_id();
+ unsigned long i;
+ unsigned long max_size = 0;
+ u64 pi_addr = 0;
+ int ret = 0;
+ int count;
+
+ pi = nova_get_inode_by_ino(sb, NOVA_INODETABLE_INO);
+ data_bits = blk_type_to_shift[pi->i_blk_type];
+ num_inodes_per_page = 1 << (data_bits - NOVA_INODE_BITS);
+
+ ring = &task_rings[cpuid];
+ nova_init_header(sb, &sih, 0);
+
+ for (count = 0; count < ring->num; count++) {
+ curr = ring->addr0[count];
+ ino_low = ino_high = 0;
+
+ /*
+ * Note: The inode log page is allocated in 2MB
+ * granularity, but not aligned on 2MB boundary.
+ */
+ for (i = 0; i < 512; i++)
+ set_bm((curr >> PAGE_SHIFT) + i,
+ global_bm[cpuid], BM_4K);
+
+ for (i = 0; i < num_inodes_per_page; i++) {
+ pi_addr = curr + i * NOVA_INODE_SIZE;
+ ret = nova_get_reference(sb, pi_addr, &fake_pi,
+ (void **)&pi, sizeof(struct nova_inode));
+ if (ret) {
+ nova_dbg("Recover pi @ 0x%llx failed\n",
+ pi_addr);
+ continue;
+ }
+ /* FIXME: Check inode checksum */
+ if (fake_pi.i_mode && fake_pi.deleted == 0) {
+ if (fake_pi.valid == 0) {
+ /* Deleteable */
+ pi->deleted = 1;
+ fake_pi.deleted = 1;
+ continue;
+ }
+
+ nova_recover_inode_pages(sb, &sih, ring,
+ &fake_pi, global_bm[cpuid]);
+ nova_failure_update_inodetree(sb, pi,
+ &ino_low, &ino_high);
+ if (sih.i_size > max_size)
+ max_size = sih.i_size;
+ }
+ }
+
+ if (ino_low && ino_high)
+ nova_failure_insert_inodetree(sb, ino_low, ino_high);
+ }
+
+ /* Free radix tree */
+ if (max_size) {
+ last_blocknr = (max_size - 1) >> PAGE_SHIFT;
+ nova_delete_file_tree(sb, &sih, 0, last_blocknr,
+ false, false, 0);
+ }
+
+ finished[cpuid] = 1;
+ wake_up_interruptible(&finish_wq);
+ do_exit(ret);
+ return ret;
+}
+
+static int nova_failure_recovery_crawl(struct super_block *sb)
+{
+ struct nova_sb_info *sbi = NOVA_SB(sb);
+ struct nova_inode_info_header sih;
+ struct inode_table *inode_table;
+ struct task_ring *ring;
+ struct nova_inode *pi, fake_pi;
+ unsigned long curr_addr;
+ u64 root_addr;
+ u64 curr;
+ int ret = 0;
+ int count;
+ int cpuid;
+
+ root_addr = nova_get_reserved_inode_addr(sb, NOVA_ROOT_INO);
+
+ for (cpuid = 0; cpuid < sbi->cpus; cpuid++) {
+ ring = &task_rings[cpuid];
+ inode_table = nova_get_inode_table(sb, cpuid);
+ if (!inode_table)
+ return -EINVAL;
+
+ count = 0;
+ curr = inode_table->log_head;
+ while (curr) {
+ if (ring->num >= 512) {
+ nova_err(sb, "%s: ring size too small\n",
+ __func__);
+ return -EINVAL;
+ }
+
+ ring->addr0[count] = curr;
+
+ count++;
+
+ curr_addr = (unsigned long)nova_get_block(sb,
+ curr);
+ /* Next page resides at the last 8 bytes */
+ curr_addr += 2097152 - 8;
+ curr = *(u64 *)(curr_addr);
+ }
+
+ if (count > ring->num)
+ ring->num = count;
+ }
+
+ for (cpuid = 0; cpuid < sbi->cpus; cpuid++)
+ wake_up_process(threads[cpuid]);
+
+ nova_init_header(sb, &sih, 0);
+ /* Recover the root iode */
+ ret = nova_get_reference(sb, root_addr, &fake_pi,
+ (void **)&pi, sizeof(struct nova_inode));
+ if (ret) {
+ nova_dbg("Recover root pi failed\n");
+ return ret;
+ }
+
+ nova_recover_inode_pages(sb, &sih, &task_rings[0],
+ &fake_pi, global_bm[1]);
+
+ return ret;
+}
+
+int nova_failure_recovery(struct super_block *sb)
+{
+ struct nova_sb_info *sbi = NOVA_SB(sb);
+ struct task_ring *ring;
+ struct nova_inode *pi;
+ struct journal_ptr_pair *pair;
+ int ret;
+ int i;
+
+ sbi->s_inodes_used_count = 0;
+
+ /* Initialize inuse inode list */
+ if (nova_init_inode_inuse_list(sb) < 0)
+ return -EINVAL;
+
+ /* Handle special inodes */
+ pi = nova_get_inode_by_ino(sb, NOVA_BLOCKNODE_INO);
+ pi->log_head = pi->log_tail = 0;
+ nova_flush_buffer(&pi->log_head, CACHELINE_SIZE, 0);
+
+ for (i = 0; i < sbi->cpus; i++) {
+ pair = nova_get_journal_pointers(sb, i);
+
+ set_bm(pair->journal_head >> PAGE_SHIFT, global_bm[i], BM_4K);
+ }
+
+ PERSISTENT_BARRIER();
+
+ ret = allocate_resources(sb, sbi->cpus);
+ if (ret)
+ return ret;
+
+ ret = nova_failure_recovery_crawl(sb);
+
+ wait_to_finish(sbi->cpus);
+
+ for (i = 0; i < sbi->cpus; i++) {
+ ring = &task_rings[i];
+ sbi->s_inodes_used_count += ring->inodes_used_count;
+ }
+
+ free_resources(sb);
+
+ nova_dbg("Failure recovery total recovered %lu\n",
+ sbi->s_inodes_used_count - NOVA_NORMAL_INODE_START);
+ return ret;
+}
+
/*********************** Recovery entrance *************************/

/* Return TRUE if we can do a normal unmount recovery */
@@ -1027,7 +1404,23 @@ int nova_recovery(struct super_block *sb)
nova_init_blockmap(sb, 1);

value = nova_try_normal_recovery(sb);
+ if (value) {
+ nova_dbg("NOVA: Normal shutdown\n");
+ } else {
+ nova_dbg("NOVA: Failure recovery\n");
+ ret = alloc_bm(sb, initsize);
+ if (ret)
+ goto out;
+
+ sbi->s_inodes_used_count = 0;
+ ret = nova_failure_recovery(sb);
+ if (ret)
+ goto out;

+ ret = nova_build_blocknode_map(sb, initsize);
+ }
+
+out:
NOVA_END_TIMING(recovery_t, start);
if (measure_timing == 0) {
getrawmonotonic(&end);
@@ -1036,6 +1429,9 @@ int nova_recovery(struct super_block *sb)
(end.tv_nsec - start.tv_nsec);
}

+ if (!value)
+ free_bm(sb);
+
sbi->s_epoch_id = le64_to_cpu(super->s_epoch_id);
return ret;
}
--
2.7.4
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