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-rw-r--r--fs/nilfs2/bmap.h244
1 files changed, 244 insertions, 0 deletions
diff --git a/fs/nilfs2/bmap.h b/fs/nilfs2/bmap.h
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--- /dev/null
+++ b/fs/nilfs2/bmap.h
@@ -0,0 +1,244 @@
+/*
+ * bmap.h - NILFS block mapping.
+ *
+ * Copyright (C) 2006-2008 Nippon Telegraph and Telephone Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ * Written by Koji Sato <koji@osrg.net>.
+ */
+
+#ifndef _NILFS_BMAP_H
+#define _NILFS_BMAP_H
+
+#include <linux/types.h>
+#include <linux/fs.h>
+#include <linux/buffer_head.h>
+#include <linux/nilfs2_fs.h>
+#include "alloc.h"
+
+#define NILFS_BMAP_INVALID_PTR 0
+
+#define nilfs_bmap_dkey_to_key(dkey) le64_to_cpu(dkey)
+#define nilfs_bmap_key_to_dkey(key) cpu_to_le64(key)
+#define nilfs_bmap_dptr_to_ptr(dptr) le64_to_cpu(dptr)
+#define nilfs_bmap_ptr_to_dptr(ptr) cpu_to_le64(ptr)
+
+#define nilfs_bmap_keydiff_abs(diff) ((diff) < 0 ? -(diff) : (diff))
+
+
+struct nilfs_bmap;
+
+/**
+ * union nilfs_bmap_ptr_req - request for bmap ptr
+ * @bpr_ptr: bmap pointer
+ * @bpr_req: request for persistent allocator
+ */
+union nilfs_bmap_ptr_req {
+ __u64 bpr_ptr;
+ struct nilfs_palloc_req bpr_req;
+};
+
+/**
+ * struct nilfs_bmap_stats - bmap statistics
+ * @bs_nblocks: number of blocks created or deleted
+ */
+struct nilfs_bmap_stats {
+ unsigned int bs_nblocks;
+};
+
+/**
+ * struct nilfs_bmap_operations - bmap operation table
+ */
+struct nilfs_bmap_operations {
+ int (*bop_lookup)(const struct nilfs_bmap *, __u64, int, __u64 *);
+ int (*bop_insert)(struct nilfs_bmap *, __u64, __u64);
+ int (*bop_delete)(struct nilfs_bmap *, __u64);
+ void (*bop_clear)(struct nilfs_bmap *);
+
+ int (*bop_propagate)(const struct nilfs_bmap *, struct buffer_head *);
+ void (*bop_lookup_dirty_buffers)(struct nilfs_bmap *,
+ struct list_head *);
+
+ int (*bop_assign)(struct nilfs_bmap *,
+ struct buffer_head **,
+ sector_t,
+ union nilfs_binfo *);
+ int (*bop_mark)(struct nilfs_bmap *, __u64, int);
+
+ /* The following functions are internal use only. */
+ int (*bop_last_key)(const struct nilfs_bmap *, __u64 *);
+ int (*bop_check_insert)(const struct nilfs_bmap *, __u64);
+ int (*bop_check_delete)(struct nilfs_bmap *, __u64);
+ int (*bop_gather_data)(struct nilfs_bmap *, __u64 *, __u64 *, int);
+};
+
+
+/**
+ * struct nilfs_bmap_ptr_operations - bmap ptr operation table
+ */
+struct nilfs_bmap_ptr_operations {
+ int (*bpop_prepare_alloc_ptr)(struct nilfs_bmap *,
+ union nilfs_bmap_ptr_req *);
+ void (*bpop_commit_alloc_ptr)(struct nilfs_bmap *,
+ union nilfs_bmap_ptr_req *);
+ void (*bpop_abort_alloc_ptr)(struct nilfs_bmap *,
+ union nilfs_bmap_ptr_req *);
+ int (*bpop_prepare_start_ptr)(struct nilfs_bmap *,
+ union nilfs_bmap_ptr_req *);
+ void (*bpop_commit_start_ptr)(struct nilfs_bmap *,
+ union nilfs_bmap_ptr_req *,
+ sector_t);
+ void (*bpop_abort_start_ptr)(struct nilfs_bmap *,
+ union nilfs_bmap_ptr_req *);
+ int (*bpop_prepare_end_ptr)(struct nilfs_bmap *,
+ union nilfs_bmap_ptr_req *);
+ void (*bpop_commit_end_ptr)(struct nilfs_bmap *,
+ union nilfs_bmap_ptr_req *);
+ void (*bpop_abort_end_ptr)(struct nilfs_bmap *,
+ union nilfs_bmap_ptr_req *);
+
+ int (*bpop_translate)(const struct nilfs_bmap *, __u64, __u64 *);
+};
+
+
+#define NILFS_BMAP_SIZE (NILFS_INODE_BMAP_SIZE * sizeof(__le64))
+#define NILFS_BMAP_KEY_BIT (sizeof(unsigned long) * 8 /* CHAR_BIT */)
+#define NILFS_BMAP_NEW_PTR_INIT \
+ (1UL << (sizeof(unsigned long) * 8 /* CHAR_BIT */ - 1))
+
+static inline int nilfs_bmap_is_new_ptr(unsigned long ptr)
+{
+ return !!(ptr & NILFS_BMAP_NEW_PTR_INIT);
+}
+
+
+/**
+ * struct nilfs_bmap - bmap structure
+ * @b_u: raw data
+ * @b_sem: semaphore
+ * @b_inode: owner of bmap
+ * @b_ops: bmap operation table
+ * @b_pops: bmap ptr operation table
+ * @b_low: low watermark of conversion
+ * @b_high: high watermark of conversion
+ * @b_last_allocated_key: last allocated key for data block
+ * @b_last_allocated_ptr: last allocated ptr for data block
+ * @b_state: state
+ */
+struct nilfs_bmap {
+ union {
+ __u8 u_flags;
+ __le64 u_data[NILFS_BMAP_SIZE / sizeof(__le64)];
+ } b_u;
+ struct rw_semaphore b_sem;
+ struct inode *b_inode;
+ const struct nilfs_bmap_operations *b_ops;
+ const struct nilfs_bmap_ptr_operations *b_pops;
+ __u64 b_low;
+ __u64 b_high;
+ __u64 b_last_allocated_key;
+ __u64 b_last_allocated_ptr;
+ int b_state;
+};
+
+/* state */
+#define NILFS_BMAP_DIRTY 0x00000001
+
+
+int nilfs_bmap_test_and_clear_dirty(struct nilfs_bmap *);
+int nilfs_bmap_read(struct nilfs_bmap *, struct nilfs_inode *);
+void nilfs_bmap_write(struct nilfs_bmap *, struct nilfs_inode *);
+int nilfs_bmap_lookup(struct nilfs_bmap *, unsigned long, unsigned long *);
+int nilfs_bmap_insert(struct nilfs_bmap *, unsigned long, unsigned long);
+int nilfs_bmap_delete(struct nilfs_bmap *, unsigned long);
+int nilfs_bmap_last_key(struct nilfs_bmap *, unsigned long *);
+int nilfs_bmap_truncate(struct nilfs_bmap *, unsigned long);
+void nilfs_bmap_clear(struct nilfs_bmap *);
+int nilfs_bmap_propagate(struct nilfs_bmap *, struct buffer_head *);
+void nilfs_bmap_lookup_dirty_buffers(struct nilfs_bmap *, struct list_head *);
+int nilfs_bmap_assign(struct nilfs_bmap *, struct buffer_head **,
+ unsigned long, union nilfs_binfo *);
+int nilfs_bmap_lookup_at_level(struct nilfs_bmap *, __u64, int, __u64 *);
+int nilfs_bmap_mark(struct nilfs_bmap *, __u64, int);
+
+void nilfs_bmap_init_gc(struct nilfs_bmap *);
+void nilfs_bmap_init_gcdat(struct nilfs_bmap *, struct nilfs_bmap *);
+void nilfs_bmap_commit_gcdat(struct nilfs_bmap *, struct nilfs_bmap *);
+
+
+/*
+ * Internal use only
+ */
+
+int nilfs_bmap_move_v(const struct nilfs_bmap *, __u64, sector_t);
+int nilfs_bmap_mark_dirty(const struct nilfs_bmap *, __u64);
+
+
+__u64 nilfs_bmap_data_get_key(const struct nilfs_bmap *,
+ const struct buffer_head *);
+
+__u64 nilfs_bmap_find_target_seq(const struct nilfs_bmap *, __u64);
+__u64 nilfs_bmap_find_target_in_group(const struct nilfs_bmap *);
+
+int nilfs_bmap_prepare_update(struct nilfs_bmap *,
+ union nilfs_bmap_ptr_req *,
+ union nilfs_bmap_ptr_req *);
+void nilfs_bmap_commit_update(struct nilfs_bmap *,
+ union nilfs_bmap_ptr_req *,
+ union nilfs_bmap_ptr_req *);
+void nilfs_bmap_abort_update(struct nilfs_bmap *,
+ union nilfs_bmap_ptr_req *,
+ union nilfs_bmap_ptr_req *);
+
+void nilfs_bmap_add_blocks(const struct nilfs_bmap *, int);
+void nilfs_bmap_sub_blocks(const struct nilfs_bmap *, int);
+
+
+int nilfs_bmap_get_block(const struct nilfs_bmap *, __u64,
+ struct buffer_head **);
+void nilfs_bmap_put_block(const struct nilfs_bmap *, struct buffer_head *);
+int nilfs_bmap_get_new_block(const struct nilfs_bmap *, __u64,
+ struct buffer_head **);
+void nilfs_bmap_delete_block(const struct nilfs_bmap *, struct buffer_head *);
+
+
+/* Assume that bmap semaphore is locked. */
+static inline int nilfs_bmap_dirty(const struct nilfs_bmap *bmap)
+{
+ return !!(bmap->b_state & NILFS_BMAP_DIRTY);
+}
+
+/* Assume that bmap semaphore is locked. */
+static inline void nilfs_bmap_set_dirty(struct nilfs_bmap *bmap)
+{
+ bmap->b_state |= NILFS_BMAP_DIRTY;
+}
+
+/* Assume that bmap semaphore is locked. */
+static inline void nilfs_bmap_clear_dirty(struct nilfs_bmap *bmap)
+{
+ bmap->b_state &= ~NILFS_BMAP_DIRTY;
+}
+
+
+#define NILFS_BMAP_LARGE 0x1
+
+#define NILFS_BMAP_SMALL_LOW NILFS_DIRECT_KEY_MIN
+#define NILFS_BMAP_SMALL_HIGH NILFS_DIRECT_KEY_MAX
+#define NILFS_BMAP_LARGE_LOW NILFS_BTREE_ROOT_NCHILDREN_MAX
+#define NILFS_BMAP_LARGE_HIGH NILFS_BTREE_KEY_MAX
+
+#endif /* _NILFS_BMAP_H */
generated by cgit v0.10.2 at 2024-11-12 02:04:33 (GMT)