#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>
/**
* struct the_nilfs - struct to supervise multiple nilfs mount points
* @ns_flags: flags
- * @ns_count: reference count
- * @ns_list: list head for nilfs_list
* @ns_bdev: block device
* @ns_bdi: backing dev info
* @ns_writer: back pointer to writable nilfs_sb_info
* @ns_sem: semaphore for shared states
- * @ns_super_sem: semaphore for global operations across super block instances
- * @ns_mount_mutex: mutex protecting mount process of nilfs
* @ns_writer_sem: semaphore protecting ns_writer attach/detach
- * @ns_current: back pointer to current mount
* @ns_sbh: buffer heads of on-disk super blocks
* @ns_sbp: pointers to super block data
* @ns_sbwtime: previous write time of super block
* @ns_sbwcount: write count of super block
* @ns_sbsize: size of valid data in super block
- * @ns_supers: list of nilfs super block structs
* @ns_seg_seq: segment sequence counter
* @ns_segnum: index number of the latest full segment.
* @ns_nextnum: index number of the full segment index to be used next
* @ns_dat: DAT file inode
* @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_gc_inodes_h: hash list to keep dummy inode holding live blocks
* @ns_blocksize_bits: bit length of block size
* @ns_blocksize: block size
* @ns_nsegments: number of segments in filesystem
*/
struct the_nilfs {
unsigned long ns_flags;
- atomic_t ns_count;
- struct list_head ns_list;
struct block_device *ns_bdev;
struct backing_dev_info *ns_bdi;
struct nilfs_sb_info *ns_writer;
struct rw_semaphore ns_sem;
- struct rw_semaphore ns_super_sem;
- struct mutex ns_mount_mutex;
struct rw_semaphore ns_writer_sem;
- /*
- * components protected by ns_super_sem
- */
- struct nilfs_sb_info *ns_current;
- struct list_head ns_supers;
-
/*
* used for
* - loading the latest checkpoint exclusively.
struct inode *ns_dat;
struct inode *ns_cpfile;
struct inode *ns_sufile;
- struct inode *ns_gc_dat;
- /* GC inode list and hash table head */
+ /* Checkpoint tree */
+ struct rb_root ns_cptree;
+ spinlock_t ns_cptree_lock;
+
+ /* GC inode list */
struct list_head ns_gc_inodes;
- struct hlist_head *ns_gc_inodes_h;
/* Disk layout information (static) */
unsigned int ns_blocksize_bits;
u32 ns_crc_seed;
};
-#define NILFS_GCINODE_HASH_BITS 8
-#define NILFS_GCINODE_HASH_SIZE (1<<NILFS_GCINODE_HASH_BITS)
-
#define THE_NILFS_FNS(bit, name) \
static inline void set_nilfs_##name(struct the_nilfs *nilfs) \
{ \
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
}
void nilfs_set_last_segment(struct the_nilfs *, sector_t, u64, __u64);
-struct the_nilfs *find_or_create_nilfs(struct block_device *);
-void put_nilfs(struct the_nilfs *);
+struct the_nilfs *alloc_nilfs(struct block_device *bdev);
+void destroy_nilfs(struct the_nilfs *nilfs);
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 *);
void nilfs_swap_super_block(struct the_nilfs *);
-static inline void get_nilfs(struct the_nilfs *nilfs)
+static inline void nilfs_get_root(struct nilfs_root *root)
{
- /* Caller must have at least one reference of the_nilfs. */
- atomic_inc(&nilfs->ns_count);
+ atomic_inc(&root->count);
}
static inline void
up_write(&nilfs->ns_writer_sem);
}
-static inline void nilfs_put_sbinfo(struct nilfs_sb_info *sbi)
-{
- if (atomic_dec_and_test(&sbi->s_count))
- kfree(sbi);
-}
-
static inline int nilfs_valid_fs(struct the_nilfs *nilfs)
{
unsigned valid_fs;
git.openpandora.org / pandora-kernel.git / blobdiff