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authorRyusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>2010-08-14 12:59:15 +0900
committerRyusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>2010-10-23 09:24:34 +0900
commitba65ae4729bf81c58d9fc847f67d57eec525b042 (patch)
tree6b2a4499a1e67bf858ce55cfe2e806b24c3697e7 /fs/nilfs2/the_nilfs.h
parent263d90cefc7d82a01c296c59532ff59d67c63509 (diff)
nilfs2: add checkpoint tree to nilfs object
To hold multiple versions of a filesystem in one sb instance, a new on-memory structure is necessary to handle one or more checkpoints. This adds a red-black tree of checkpoints to nilfs object, and adds lookup and create functions for them. Each checkpoint is represented by "nilfs_root" structure, and this structure has rb_node to configure the rb-tree. The nilfs_root object is identified with a checkpoint number. For each snapshot, a nilfs_root object is allocated and the checkpoint number of snapshot is assigned to it. For a regular mount (i.e. current mode mount), NILFS_CPTREE_CURRENT_CNO constant is assigned to the corresponding nilfs_root object. Each nilfs_root object has an ifile inode and some counters. These items will displace those of nilfs_sb_info structure in successive patches. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Diffstat (limited to 'fs/nilfs2/the_nilfs.h')
-rw-r--r--fs/nilfs2/the_nilfs.h42
1 files changed, 42 insertions, 0 deletions
diff --git a/fs/nilfs2/the_nilfs.h b/fs/nilfs2/the_nilfs.h
index c7ecd0c623a3..0afede68a9e1 100644
--- a/fs/nilfs2/the_nilfs.h
+++ b/fs/nilfs2/the_nilfs.h
@@ -26,6 +26,7 @@
#include <linux/types.h>
#include <linux/buffer_head.h>
+#include <linux/rbtree.h>
#include <linux/fs.h>
#include <linux/blkdev.h>
#include <linux/backing-dev.h>
@@ -80,6 +81,8 @@ enum {
* @ns_cpfile: checkpoint file inode
* @ns_sufile: segusage file inode
* @ns_gc_dat: shadow inode of the DAT file inode for GC
+ * @ns_cptree: rb-tree of all mounted checkpoints (nilfs_root)
+ * @ns_cptree_lock: lock protecting @ns_cptree
* @ns_gc_inodes: dummy inodes to keep live blocks
* @ns_blocksize_bits: bit length of block size
* @ns_blocksize: block size
@@ -164,6 +167,10 @@ struct the_nilfs {
struct inode *ns_sufile;
struct inode *ns_gc_dat;
+ /* Checkpoint tree */
+ struct rb_root ns_cptree;
+ spinlock_t ns_cptree_lock;
+
/* GC inode list */
struct list_head ns_gc_inodes;
@@ -200,6 +207,32 @@ THE_NILFS_FNS(DISCONTINUED, discontinued)
THE_NILFS_FNS(GC_RUNNING, gc_running)
THE_NILFS_FNS(SB_DIRTY, sb_dirty)
+/**
+ * struct nilfs_root - nilfs root object
+ * @cno: checkpoint number
+ * @rb_node: red-black tree node
+ * @count: refcount of this structure
+ * @nilfs: nilfs object
+ * @ifile: inode file
+ * @root: root inode
+ * @inodes_count: number of inodes
+ * @blocks_count: number of blocks (Reserved)
+ */
+struct nilfs_root {
+ __u64 cno;
+ struct rb_node rb_node;
+
+ atomic_t count;
+ struct the_nilfs *nilfs;
+ struct inode *ifile;
+
+ atomic_t inodes_count;
+ atomic_t blocks_count;
+};
+
+/* Special checkpoint number */
+#define NILFS_CPTREE_CURRENT_CNO 0
+
/* Minimum interval of periodical update of superblocks (in seconds) */
#define NILFS_SB_FREQ 10
@@ -222,6 +255,10 @@ int init_nilfs(struct the_nilfs *, struct nilfs_sb_info *, char *);
int load_nilfs(struct the_nilfs *, struct nilfs_sb_info *);
int nilfs_discard_segments(struct the_nilfs *, __u64 *, size_t);
int nilfs_count_free_blocks(struct the_nilfs *, sector_t *);
+struct nilfs_root *nilfs_lookup_root(struct the_nilfs *nilfs, __u64 cno);
+struct nilfs_root *nilfs_find_or_create_root(struct the_nilfs *nilfs,
+ __u64 cno);
+void nilfs_put_root(struct nilfs_root *root);
struct nilfs_sb_info *nilfs_find_sbinfo(struct the_nilfs *, int, __u64);
int nilfs_checkpoint_is_mounted(struct the_nilfs *, __u64, int);
int nilfs_near_disk_full(struct the_nilfs *);
@@ -235,6 +272,11 @@ static inline void get_nilfs(struct the_nilfs *nilfs)
atomic_inc(&nilfs->ns_count);
}
+static inline void nilfs_get_root(struct nilfs_root *root)
+{
+ atomic_inc(&root->count);
+}
+
static inline void
nilfs_attach_writer(struct the_nilfs *nilfs, struct nilfs_sb_info *sbi)
{