[Ocfs2-devel] [PATCH 08/41] ocfs2: Basic tree root operation.
Tao Ma
tao.ma at oracle.com
Mon Aug 17 23:19:09 PDT 2009
Add basic refcount tree root operation.
Signed-off-by: Tao Ma <tao.ma at oracle.com>
---
fs/ocfs2/journal.h | 14 ++
fs/ocfs2/refcounttree.c | 343 ++++++++++++++++++++++++++++++++++++++++++++++-
2 files changed, 351 insertions(+), 6 deletions(-)
diff --git a/fs/ocfs2/journal.h b/fs/ocfs2/journal.h
index b2dc125..bd88c8b 100644
--- a/fs/ocfs2/journal.h
+++ b/fs/ocfs2/journal.h
@@ -490,6 +490,20 @@ static inline int ocfs2_calc_dxi_expand_credits(struct super_block *sb)
return credits;
}
+/* inode update, new refcount block and its allocation credits. */
+#define OCFS2_REFCOUNT_TREE_CREATE_CREDITS (OCFS2_INODE_UPDATE_CREDITS + 1 \
+ + OCFS2_SUBALLOC_ALLOC)
+
+/* inode and the refcount block update. */
+#define OCFS2_REFCOUNT_TREE_SET_CREDITS (OCFS2_INODE_UPDATE_CREDITS + 1)
+
+/*
+ * inode and the refcount block update.
+ * It doesn't include the credits for sub alloc change.
+ * So if we need to free the bit, OCFS2_SUBALLOC_FREE needs to be added.
+ */
+#define OCFS2_REFCOUNT_TREE_REMOVE_CREDITS (OCFS2_INODE_UPDATE_CREDITS + 1)
+
/*
* Please note that the caller must make sure that root_el is the root
* of extent tree. So for an inode, it should be &fe->id2.i_list. Otherwise
diff --git a/fs/ocfs2/refcounttree.c b/fs/ocfs2/refcounttree.c
index b6d356b..650347b 100644
--- a/fs/ocfs2/refcounttree.c
+++ b/fs/ocfs2/refcounttree.c
@@ -27,6 +27,7 @@
#include "buffer_head_io.h"
#include "blockcheck.h"
#include "refcounttree.h"
+#include "sysfile.h"
#include "dlmglue.h"
static inline struct ocfs2_refcount_tree *
@@ -272,6 +273,22 @@ static inline void ocfs2_init_refcount_tree_lock(struct ocfs2_super *osb,
rf_blkno, generation);
}
+static struct ocfs2_refcount_tree*
+ocfs2_allocate_refcount_tree(struct ocfs2_super *osb, u64 rf_blkno)
+{
+ struct ocfs2_refcount_tree *new;
+
+ new = kzalloc(sizeof(struct ocfs2_refcount_tree), GFP_NOFS);
+ if (!new)
+ return NULL;
+
+ new->rf_blkno = rf_blkno;
+ kref_init(&new->rf_getcnt);
+ ocfs2_init_refcount_tree_ci(new, osb->sb);
+
+ return new;
+}
+
static int ocfs2_get_refcount_tree(struct ocfs2_super *osb, u64 rf_blkno,
struct ocfs2_refcount_tree **ret_tree)
{
@@ -291,16 +308,12 @@ static int ocfs2_get_refcount_tree(struct ocfs2_super *osb, u64 rf_blkno,
spin_unlock(&osb->osb_lock);
- new = kzalloc(sizeof(struct ocfs2_refcount_tree), GFP_NOFS);
+ new = ocfs2_allocate_refcount_tree(osb, rf_blkno);
if (!new) {
ret = -ENOMEM;
+ mlog_errno(ret);
return ret;
}
-
- new->rf_blkno = rf_blkno;
- kref_init(&new->rf_getcnt);
- ocfs2_init_refcount_tree_ci(new, osb->sb);
-
/*
* We need the generation to create the refcount tree lock and since
* it isn't changed during the tree modification, we are safe here to
@@ -515,3 +528,321 @@ void ocfs2_purge_refcount_tree(struct ocfs2_super *osb)
ocfs2_free_refcount_tree(tree);
}
}
+
+/*
+ * Create a refcount tree for an inode.
+ * We take for granted that the inode is already locked.
+ */
+static int ocfs2_create_refcount_tree(struct inode *inode,
+ struct buffer_head *di_bh)
+{
+ int ret;
+ handle_t *handle = NULL;
+ struct ocfs2_alloc_context *meta_ac = NULL;
+ struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
+ struct ocfs2_inode_info *oi = OCFS2_I(inode);
+ struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+ struct buffer_head *new_bh = NULL;
+ struct ocfs2_refcount_block *rb;
+ struct ocfs2_refcount_tree *new_tree = NULL, *tree = NULL;
+ u16 suballoc_bit_start;
+ u32 num_got;
+ u64 first_blkno;
+
+ BUG_ON(oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL);
+
+ mlog(0, "create tree for inode %lu\n", inode->i_ino);
+
+ ret = ocfs2_reserve_new_metadata_blocks(osb, 1, &meta_ac);
+ if (ret) {
+ mlog_errno(ret);
+ goto out;
+ }
+
+ handle = ocfs2_start_trans(osb, OCFS2_REFCOUNT_TREE_CREATE_CREDITS);
+ if (IS_ERR(handle)) {
+ ret = PTR_ERR(handle);
+ mlog_errno(ret);
+ goto out;
+ }
+
+ ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
+ OCFS2_JOURNAL_ACCESS_WRITE);
+ if (ret) {
+ mlog_errno(ret);
+ goto out_commit;
+ }
+
+ ret = ocfs2_claim_metadata(osb, handle, meta_ac, 1,
+ &suballoc_bit_start, &num_got,
+ &first_blkno);
+ if (ret) {
+ mlog_errno(ret);
+ goto out_commit;
+ }
+
+ new_tree = ocfs2_allocate_refcount_tree(osb, first_blkno);
+ if (!new_tree) {
+ ret = -ENOMEM;
+ mlog_errno(ret);
+ goto out_commit;
+ }
+
+ new_bh = sb_getblk(inode->i_sb, first_blkno);
+ ocfs2_set_new_buffer_uptodate(&new_tree->rf_ci, new_bh);
+
+ ret = ocfs2_journal_access_rb(handle, &new_tree->rf_ci, new_bh,
+ OCFS2_JOURNAL_ACCESS_CREATE);
+ if (ret) {
+ mlog_errno(ret);
+ goto out_commit;
+ }
+
+ /* Initialize ocfs2_refcount_block. */
+ rb = (struct ocfs2_refcount_block *)new_bh->b_data;
+ memset(rb, 0, inode->i_sb->s_blocksize);
+ strcpy((void *)rb, OCFS2_REFCOUNT_BLOCK_SIGNATURE);
+ rb->rf_suballoc_slot = cpu_to_le16(osb->slot_num);
+ rb->rf_suballoc_bit = cpu_to_le16(suballoc_bit_start);
+ rb->rf_fs_generation = cpu_to_le32(osb->fs_generation);
+ rb->rf_blkno = cpu_to_le64(first_blkno);
+ rb->rf_count = cpu_to_le32(1);
+ rb->rf_records.rl_count =
+ cpu_to_le16(ocfs2_refcount_recs_per_rb(osb->sb));
+ spin_lock(&osb->osb_lock);
+ rb->rf_generation = osb->s_next_generation++;
+ spin_unlock(&osb->osb_lock);
+
+ ocfs2_journal_dirty(handle, new_bh);
+
+ spin_lock(&oi->ip_lock);
+ oi->ip_dyn_features |= OCFS2_HAS_REFCOUNT_FL;
+ di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
+ di->i_refcount_loc = cpu_to_le64(first_blkno);
+ spin_unlock(&oi->ip_lock);
+
+ mlog(0, "created tree for inode %lu, refblock %llu\n",
+ inode->i_ino, (unsigned long long)first_blkno);
+
+ ocfs2_journal_dirty(handle, di_bh);
+
+ /*
+ * We have to init the tree lock here since it will use
+ * the generation number to create it.
+ */
+ new_tree->rf_generation = le32_to_cpu(rb->rf_generation);
+ ocfs2_init_refcount_tree_lock(osb, new_tree, first_blkno,
+ new_tree->rf_generation);
+
+ spin_lock(&osb->osb_lock);
+ tree = ocfs2_find_refcount_tree(osb, first_blkno);
+
+ /*
+ * The tree has been deleted and recreated. So remove the old
+ * tree in this node.
+ */
+ BUG_ON(tree && tree->rf_generation == new_tree->rf_generation);
+ if (tree)
+ ocfs2_erase_refcount_tree_from_list_no_lock(osb, tree);
+ ocfs2_insert_refcount_tree(osb, new_tree);
+ spin_unlock(&osb->osb_lock);
+ new_tree = NULL;
+ if (tree)
+ ocfs2_refcount_tree_put(tree);
+
+out_commit:
+ ocfs2_commit_trans(osb, handle);
+
+out:
+ if (new_tree) {
+ ocfs2_metadata_cache_exit(&new_tree->rf_ci);
+ kfree(new_tree);
+ }
+
+ brelse(new_bh);
+ if (meta_ac)
+ ocfs2_free_alloc_context(meta_ac);
+
+ return ret;
+}
+
+static int ocfs2_set_refcount_tree(struct inode *inode,
+ struct buffer_head *di_bh,
+ u64 refcount_loc)
+{
+ int ret;
+ handle_t *handle = NULL;
+ struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
+ struct ocfs2_inode_info *oi = OCFS2_I(inode);
+ struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+ struct buffer_head *ref_root_bh = NULL;
+ struct ocfs2_refcount_block *rb;
+ struct ocfs2_refcount_tree *ref_tree;
+
+ BUG_ON(oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL);
+
+ ret = ocfs2_lock_refcount_tree(osb, refcount_loc, 1,
+ &ref_tree, &ref_root_bh);
+ if (ret) {
+ mlog_errno(ret);
+ return ret;
+ }
+
+ handle = ocfs2_start_trans(osb, OCFS2_REFCOUNT_TREE_SET_CREDITS);
+ if (IS_ERR(handle)) {
+ ret = PTR_ERR(handle);
+ mlog_errno(ret);
+ goto out;
+ }
+
+ ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
+ OCFS2_JOURNAL_ACCESS_WRITE);
+ if (ret) {
+ mlog_errno(ret);
+ goto out_commit;
+ }
+
+ ret = ocfs2_journal_access_rb(handle, &ref_tree->rf_ci, ref_root_bh,
+ OCFS2_JOURNAL_ACCESS_WRITE);
+ if (ret) {
+ mlog_errno(ret);
+ goto out_commit;
+ }
+
+ rb = (struct ocfs2_refcount_block *)ref_root_bh->b_data;
+ le32_add_cpu(&rb->rf_count, 1);
+
+ ocfs2_journal_dirty(handle, ref_root_bh);
+
+ spin_lock(&oi->ip_lock);
+ oi->ip_dyn_features |= OCFS2_HAS_REFCOUNT_FL;
+ di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
+ di->i_refcount_loc = cpu_to_le64(refcount_loc);
+ spin_unlock(&oi->ip_lock);
+ ocfs2_journal_dirty(handle, di_bh);
+
+out_commit:
+ ocfs2_commit_trans(osb, handle);
+out:
+ ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
+ brelse(ref_root_bh);
+
+ return ret;
+}
+
+int ocfs2_remove_refcount_tree(struct inode *inode, struct buffer_head *di_bh)
+{
+ int ret, delete_tree = 0;
+ handle_t *handle = NULL;
+ struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
+ struct ocfs2_inode_info *oi = OCFS2_I(inode);
+ struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+ struct ocfs2_refcount_block *rb;
+ struct inode *alloc_inode = NULL;
+ struct buffer_head *alloc_bh = NULL;
+ struct buffer_head *blk_bh = NULL;
+ struct ocfs2_refcount_tree *ref_tree;
+ int credits = OCFS2_REFCOUNT_TREE_REMOVE_CREDITS;
+ u64 blk = 0, bg_blkno = 0, ref_blkno = le64_to_cpu(di->i_refcount_loc);
+ u16 bit = 0;
+
+ if (!(oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL))
+ return 0;
+
+ BUG_ON(!ref_blkno);
+ ret = ocfs2_lock_refcount_tree(osb, ref_blkno, 1, &ref_tree, &blk_bh);
+ if (ret) {
+ mlog_errno(ret);
+ return ret;
+ }
+
+ rb = (struct ocfs2_refcount_block *)blk_bh->b_data;
+
+ /*
+ * If we are the last user, we need to free the block.
+ * So lock the allocator ahead.
+ */
+ if (le32_to_cpu(rb->rf_count) == 1) {
+ blk = le64_to_cpu(rb->rf_blkno);
+ bit = le16_to_cpu(rb->rf_suballoc_bit);
+ bg_blkno = ocfs2_which_suballoc_group(blk, bit);
+
+ alloc_inode = ocfs2_get_system_file_inode(osb,
+ EXTENT_ALLOC_SYSTEM_INODE,
+ le16_to_cpu(rb->rf_suballoc_slot));
+ if (!alloc_inode) {
+ ret = -ENOMEM;
+ mlog_errno(ret);
+ goto out;
+ }
+ mutex_lock(&alloc_inode->i_mutex);
+
+ ret = ocfs2_inode_lock(alloc_inode, &alloc_bh, 1);
+ if (ret) {
+ mlog_errno(ret);
+ goto out_mutex;
+ }
+
+ credits += OCFS2_SUBALLOC_FREE;
+ }
+
+ handle = ocfs2_start_trans(osb, credits);
+ if (IS_ERR(handle)) {
+ ret = PTR_ERR(handle);
+ mlog_errno(ret);
+ goto out_unlock;
+ }
+
+ ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
+ OCFS2_JOURNAL_ACCESS_WRITE);
+ if (ret) {
+ mlog_errno(ret);
+ goto out_commit;
+ }
+
+ ret = ocfs2_journal_access_rb(handle, &ref_tree->rf_ci, blk_bh,
+ OCFS2_JOURNAL_ACCESS_WRITE);
+ if (ret) {
+ mlog_errno(ret);
+ goto out_commit;
+ }
+
+ spin_lock(&oi->ip_lock);
+ oi->ip_dyn_features &= ~OCFS2_HAS_REFCOUNT_FL;
+ di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
+ di->i_refcount_loc = 0;
+ spin_unlock(&oi->ip_lock);
+ ocfs2_journal_dirty(handle, di_bh);
+
+ le32_add_cpu(&rb->rf_count , -1);
+ ocfs2_journal_dirty(handle, blk_bh);
+
+ if (!rb->rf_count) {
+ delete_tree = 1;
+ ocfs2_erase_refcount_tree_from_list(osb, ref_tree);
+ ret = ocfs2_free_suballoc_bits(handle, alloc_inode,
+ alloc_bh, bit, bg_blkno, 1);
+ if (ret)
+ mlog_errno(ret);
+ }
+
+out_commit:
+ ocfs2_commit_trans(osb, handle);
+out_unlock:
+ if (alloc_inode) {
+ ocfs2_inode_unlock(alloc_inode, 1);
+ brelse(alloc_bh);
+ }
+out_mutex:
+ if (alloc_inode) {
+ mutex_unlock(&alloc_inode->i_mutex);
+ iput(alloc_inode);
+ }
+out:
+ ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
+ if (delete_tree)
+ ocfs2_refcount_tree_put(ref_tree);
+ brelse(blk_bh);
+
+ return ret;
+}
--
1.6.2.rc2.16.gf474c
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