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Subject[RFC v2 38/83] Journal: NOVA lite journal initialization.
Date
From: Andiry Xu <jix024@cs.ucsd.edu>

NOVA uses per-CPU spinlock to protect the journals.
Lite journal initialization consists of two parts:
for a new NOVA instance, hard_init allocates the journal pages.
soft_init initializes the locks and performs journal recovery.

Signed-off-by: Andiry Xu <jix024@cs.ucsd.edu>
---
fs/nova/journal.c | 70 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
fs/nova/journal.h | 2 ++
fs/nova/super.c | 15 ++++++++++++
fs/nova/super.h | 3 +++
4 files changed, 90 insertions(+)

diff --git a/fs/nova/journal.c b/fs/nova/journal.c
index 0e203fa..d2578e2 100644
--- a/fs/nova/journal.c
+++ b/fs/nova/journal.c
@@ -340,3 +340,73 @@ void nova_commit_lite_transaction(struct super_block *sb, u64 tail, int cpu)
pair->journal_head = tail;
nova_flush_buffer(&pair->journal_head, CACHELINE_SIZE, 1);
}
+
+/**************************** Initialization ******************************/
+
+// Initialized DRAM journal state, validate, and recover
+int nova_lite_journal_soft_init(struct super_block *sb)
+{
+ struct nova_sb_info *sbi = NOVA_SB(sb);
+ struct journal_ptr_pair *pair;
+ int i;
+ int ret = 0;
+
+ sbi->journal_locks = kcalloc(sbi->cpus, sizeof(spinlock_t),
+ GFP_KERNEL);
+ if (!sbi->journal_locks)
+ return -ENOMEM;
+
+ for (i = 0; i < sbi->cpus; i++)
+ spin_lock_init(&sbi->journal_locks[i]);
+
+ for (i = 0; i < sbi->cpus; i++) {
+ pair = nova_get_journal_pointers(sb, i);
+ if (pair->journal_head == pair->journal_tail)
+ continue;
+
+ /* Ensure all entries are genuine */
+ ret = nova_check_journal_entries(sb, pair);
+ if (ret) {
+ nova_err(sb, "Journal %d checksum failure\n", i);
+ ret = -EINVAL;
+ break;
+ }
+
+ ret = nova_recover_lite_journal(sb, pair);
+ }
+
+ return ret;
+}
+
+/* Initialized persistent journal state */
+int nova_lite_journal_hard_init(struct super_block *sb)
+{
+ struct nova_sb_info *sbi = NOVA_SB(sb);
+ struct nova_inode_info_header sih;
+ struct journal_ptr_pair *pair;
+ unsigned long blocknr = 0;
+ int allocated;
+ int i;
+ u64 block;
+
+ sih.ino = NOVA_LITEJOURNAL_INO;
+ sih.i_blk_type = NOVA_BLOCK_TYPE_4K;
+
+ for (i = 0; i < sbi->cpus; i++) {
+ pair = nova_get_journal_pointers(sb, i);
+
+ allocated = nova_new_log_blocks(sb, &sih, &blocknr, 1,
+ ALLOC_INIT_ZERO, ANY_CPU, ALLOC_FROM_HEAD);
+ nova_dbg_verbose("%s: allocate log @ 0x%lx\n", __func__,
+ blocknr);
+ if (allocated != 1 || blocknr == 0)
+ return -ENOSPC;
+
+ block = nova_get_block_off(sb, blocknr, NOVA_BLOCK_TYPE_4K);
+ pair->journal_head = pair->journal_tail = block;
+ nova_flush_buffer(pair, CACHELINE_SIZE, 0);
+ }
+
+ PERSISTENT_BARRIER();
+ return nova_lite_journal_soft_init(sb);
+}
diff --git a/fs/nova/journal.h b/fs/nova/journal.h
index 2259880..6e3a528 100644
--- a/fs/nova/journal.h
+++ b/fs/nova/journal.h
@@ -50,5 +50,7 @@ u64 nova_create_rename_transaction(struct super_block *sb,
u64 nova_create_logentry_transaction(struct super_block *sb,
void *entry, enum nova_entry_type type, int cpu);
void nova_commit_lite_transaction(struct super_block *sb, u64 tail, int cpu);
+int nova_lite_journal_soft_init(struct super_block *sb);
+int nova_lite_journal_hard_init(struct super_block *sb);

#endif
diff --git a/fs/nova/super.c b/fs/nova/super.c
index d73c202..216d396 100644
--- a/fs/nova/super.c
+++ b/fs/nova/super.c
@@ -379,6 +379,11 @@ static struct nova_inode *nova_init(struct super_block *sb,

nova_init_blockmap(sb, 0);

+ if (nova_lite_journal_hard_init(sb) < 0) {
+ nova_err(sb, "Lite journal hard initialization failed\n");
+ return ERR_PTR(-EINVAL);
+ }
+
if (nova_init_inode_inuse_list(sb) < 0)
return ERR_PTR(-EINVAL);

@@ -598,6 +603,12 @@ static int nova_fill_super(struct super_block *sb, void *data, int silent)
goto out;
}

+ if (nova_lite_journal_soft_init(sb)) {
+ retval = -EINVAL;
+ nova_err(sb, "Lite journal initialization failed\n");
+ goto out;
+ }
+
blocksize = le32_to_cpu(sbi->nova_sb->s_blocksize);
nova_set_blocksize(sb, blocksize);

@@ -647,6 +658,9 @@ static int nova_fill_super(struct super_block *sb, void *data, int silent)

nova_delete_free_lists(sb);

+ kfree(sbi->journal_locks);
+ sbi->journal_locks = NULL;
+
kfree(sbi->inode_maps);
sbi->inode_maps = NULL;

@@ -745,6 +759,7 @@ static void nova_put_super(struct super_block *sb)

kfree(sbi->zeroed_page);
nova_dbgmask = 0;
+ kfree(sbi->journal_locks);

for (i = 0; i < sbi->cpus; i++) {
inode_map = &sbi->inode_maps[i];
diff --git a/fs/nova/super.h b/fs/nova/super.h
index 9772d2f..56a840e 100644
--- a/fs/nova/super.h
+++ b/fs/nova/super.h
@@ -119,6 +119,9 @@ struct nova_sb_info {
/* ZEROED page for cache page initialized */
void *zeroed_page;

+ /* Per-CPU journal lock */
+ spinlock_t *journal_locks;
+
/* Per-CPU inode map */
struct inode_map *inode_maps;

--
2.7.4
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