mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-16 08:44:21 +08:00
2a50a743bd
When an ocfs2 extended attribute is large enough to require its own allocation tree, we root it with an ocfs2_xattr_value_root. However, these roots can be a part of inodes, xattr blocks, or xattr buckets. Thus, they need a different journal access function for each container. We wrap the bh, its journal access function, and the value root (xv) in a structure called ocfs2_xattr_valu_buf. This is a package that can be passed around. In this first pass, we simply pass it to the extent tree code. Signed-off-by: Joel Becker <joel.becker@oracle.com> Signed-off-by: Mark Fasheh <mfasheh@suse.com>
255 lines
8.9 KiB
C
255 lines
8.9 KiB
C
/* -*- mode: c; c-basic-offset: 8; -*-
|
|
* vim: noexpandtab sw=8 ts=8 sts=0:
|
|
*
|
|
* alloc.h
|
|
*
|
|
* Function prototypes
|
|
*
|
|
* Copyright (C) 2002, 2004 Oracle. All rights reserved.
|
|
*
|
|
* 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., 59 Temple Place - Suite 330,
|
|
* Boston, MA 021110-1307, USA.
|
|
*/
|
|
|
|
#ifndef OCFS2_ALLOC_H
|
|
#define OCFS2_ALLOC_H
|
|
|
|
|
|
/*
|
|
* For xattr tree leaf, we limit the leaf byte size to be 64K.
|
|
*/
|
|
#define OCFS2_MAX_XATTR_TREE_LEAF_SIZE 65536
|
|
|
|
/*
|
|
* ocfs2_extent_tree and ocfs2_extent_tree_operations are used to abstract
|
|
* the b-tree operations in ocfs2. Now all the b-tree operations are not
|
|
* limited to ocfs2_dinode only. Any data which need to allocate clusters
|
|
* to store can use b-tree. And it only needs to implement its ocfs2_extent_tree
|
|
* and operation.
|
|
*
|
|
* ocfs2_extent_tree becomes the first-class object for extent tree
|
|
* manipulation. Callers of the alloc.c code need to fill it via one of
|
|
* the ocfs2_init_*_extent_tree() operations below.
|
|
*
|
|
* ocfs2_extent_tree contains info for the root of the b-tree, it must have a
|
|
* root ocfs2_extent_list and a root_bh so that they can be used in the b-tree
|
|
* functions. With metadata ecc, we now call different journal_access
|
|
* functions for each type of metadata, so it must have the
|
|
* root_journal_access function.
|
|
* ocfs2_extent_tree_operations abstract the normal operations we do for
|
|
* the root of extent b-tree.
|
|
*/
|
|
struct ocfs2_extent_tree_operations;
|
|
struct ocfs2_extent_tree {
|
|
struct ocfs2_extent_tree_operations *et_ops;
|
|
struct buffer_head *et_root_bh;
|
|
struct ocfs2_extent_list *et_root_el;
|
|
ocfs2_journal_access_func et_root_journal_access;
|
|
void *et_object;
|
|
unsigned int et_max_leaf_clusters;
|
|
};
|
|
|
|
/*
|
|
* ocfs2_init_*_extent_tree() will fill an ocfs2_extent_tree from the
|
|
* specified object buffer.
|
|
*/
|
|
void ocfs2_init_dinode_extent_tree(struct ocfs2_extent_tree *et,
|
|
struct inode *inode,
|
|
struct buffer_head *bh);
|
|
void ocfs2_init_xattr_tree_extent_tree(struct ocfs2_extent_tree *et,
|
|
struct inode *inode,
|
|
struct buffer_head *bh);
|
|
struct ocfs2_xattr_value_buf;
|
|
void ocfs2_init_xattr_value_extent_tree(struct ocfs2_extent_tree *et,
|
|
struct inode *inode,
|
|
struct ocfs2_xattr_value_buf *vb);
|
|
|
|
/*
|
|
* Read an extent block into *bh. If *bh is NULL, a bh will be
|
|
* allocated. This is a cached read. The extent block will be validated
|
|
* with ocfs2_validate_extent_block().
|
|
*/
|
|
int ocfs2_read_extent_block(struct inode *inode, u64 eb_blkno,
|
|
struct buffer_head **bh);
|
|
|
|
struct ocfs2_alloc_context;
|
|
int ocfs2_insert_extent(struct ocfs2_super *osb,
|
|
handle_t *handle,
|
|
struct inode *inode,
|
|
struct ocfs2_extent_tree *et,
|
|
u32 cpos,
|
|
u64 start_blk,
|
|
u32 new_clusters,
|
|
u8 flags,
|
|
struct ocfs2_alloc_context *meta_ac);
|
|
|
|
enum ocfs2_alloc_restarted {
|
|
RESTART_NONE = 0,
|
|
RESTART_TRANS,
|
|
RESTART_META
|
|
};
|
|
int ocfs2_add_clusters_in_btree(struct ocfs2_super *osb,
|
|
struct inode *inode,
|
|
u32 *logical_offset,
|
|
u32 clusters_to_add,
|
|
int mark_unwritten,
|
|
struct ocfs2_extent_tree *et,
|
|
handle_t *handle,
|
|
struct ocfs2_alloc_context *data_ac,
|
|
struct ocfs2_alloc_context *meta_ac,
|
|
enum ocfs2_alloc_restarted *reason_ret);
|
|
struct ocfs2_cached_dealloc_ctxt;
|
|
int ocfs2_mark_extent_written(struct inode *inode,
|
|
struct ocfs2_extent_tree *et,
|
|
handle_t *handle, u32 cpos, u32 len, u32 phys,
|
|
struct ocfs2_alloc_context *meta_ac,
|
|
struct ocfs2_cached_dealloc_ctxt *dealloc);
|
|
int ocfs2_remove_extent(struct inode *inode,
|
|
struct ocfs2_extent_tree *et,
|
|
u32 cpos, u32 len, handle_t *handle,
|
|
struct ocfs2_alloc_context *meta_ac,
|
|
struct ocfs2_cached_dealloc_ctxt *dealloc);
|
|
int ocfs2_remove_btree_range(struct inode *inode,
|
|
struct ocfs2_extent_tree *et,
|
|
u32 cpos, u32 phys_cpos, u32 len,
|
|
struct ocfs2_cached_dealloc_ctxt *dealloc);
|
|
|
|
int ocfs2_num_free_extents(struct ocfs2_super *osb,
|
|
struct inode *inode,
|
|
struct ocfs2_extent_tree *et);
|
|
|
|
/*
|
|
* how many new metadata chunks would an allocation need at maximum?
|
|
*
|
|
* 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
|
|
* the result may be wrong.
|
|
*/
|
|
static inline int ocfs2_extend_meta_needed(struct ocfs2_extent_list *root_el)
|
|
{
|
|
/*
|
|
* Rather than do all the work of determining how much we need
|
|
* (involves a ton of reads and locks), just ask for the
|
|
* maximal limit. That's a tree depth shift. So, one block for
|
|
* level of the tree (current l_tree_depth), one block for the
|
|
* new tree_depth==0 extent_block, and one block at the new
|
|
* top-of-the tree.
|
|
*/
|
|
return le16_to_cpu(root_el->l_tree_depth) + 2;
|
|
}
|
|
|
|
void ocfs2_dinode_new_extent_list(struct inode *inode, struct ocfs2_dinode *di);
|
|
void ocfs2_set_inode_data_inline(struct inode *inode, struct ocfs2_dinode *di);
|
|
int ocfs2_convert_inline_data_to_extents(struct inode *inode,
|
|
struct buffer_head *di_bh);
|
|
|
|
int ocfs2_truncate_log_init(struct ocfs2_super *osb);
|
|
void ocfs2_truncate_log_shutdown(struct ocfs2_super *osb);
|
|
void ocfs2_schedule_truncate_log_flush(struct ocfs2_super *osb,
|
|
int cancel);
|
|
int ocfs2_flush_truncate_log(struct ocfs2_super *osb);
|
|
int ocfs2_begin_truncate_log_recovery(struct ocfs2_super *osb,
|
|
int slot_num,
|
|
struct ocfs2_dinode **tl_copy);
|
|
int ocfs2_complete_truncate_log_recovery(struct ocfs2_super *osb,
|
|
struct ocfs2_dinode *tl_copy);
|
|
int ocfs2_truncate_log_needs_flush(struct ocfs2_super *osb);
|
|
int ocfs2_truncate_log_append(struct ocfs2_super *osb,
|
|
handle_t *handle,
|
|
u64 start_blk,
|
|
unsigned int num_clusters);
|
|
int __ocfs2_flush_truncate_log(struct ocfs2_super *osb);
|
|
|
|
/*
|
|
* Process local structure which describes the block unlinks done
|
|
* during an operation. This is populated via
|
|
* ocfs2_cache_block_dealloc().
|
|
*
|
|
* ocfs2_run_deallocs() should be called after the potentially
|
|
* de-allocating routines. No journal handles should be open, and most
|
|
* locks should have been dropped.
|
|
*/
|
|
struct ocfs2_cached_dealloc_ctxt {
|
|
struct ocfs2_per_slot_free_list *c_first_suballocator;
|
|
struct ocfs2_cached_block_free *c_global_allocator;
|
|
};
|
|
static inline void ocfs2_init_dealloc_ctxt(struct ocfs2_cached_dealloc_ctxt *c)
|
|
{
|
|
c->c_first_suballocator = NULL;
|
|
c->c_global_allocator = NULL;
|
|
}
|
|
int ocfs2_cache_cluster_dealloc(struct ocfs2_cached_dealloc_ctxt *ctxt,
|
|
u64 blkno, unsigned int bit);
|
|
static inline int ocfs2_dealloc_has_cluster(struct ocfs2_cached_dealloc_ctxt *c)
|
|
{
|
|
return c->c_global_allocator != NULL;
|
|
}
|
|
int ocfs2_run_deallocs(struct ocfs2_super *osb,
|
|
struct ocfs2_cached_dealloc_ctxt *ctxt);
|
|
|
|
struct ocfs2_truncate_context {
|
|
struct ocfs2_cached_dealloc_ctxt tc_dealloc;
|
|
int tc_ext_alloc_locked; /* is it cluster locked? */
|
|
/* these get destroyed once it's passed to ocfs2_commit_truncate. */
|
|
struct buffer_head *tc_last_eb_bh;
|
|
};
|
|
|
|
int ocfs2_zero_range_for_truncate(struct inode *inode, handle_t *handle,
|
|
u64 range_start, u64 range_end);
|
|
int ocfs2_prepare_truncate(struct ocfs2_super *osb,
|
|
struct inode *inode,
|
|
struct buffer_head *fe_bh,
|
|
struct ocfs2_truncate_context **tc);
|
|
int ocfs2_commit_truncate(struct ocfs2_super *osb,
|
|
struct inode *inode,
|
|
struct buffer_head *fe_bh,
|
|
struct ocfs2_truncate_context *tc);
|
|
int ocfs2_truncate_inline(struct inode *inode, struct buffer_head *di_bh,
|
|
unsigned int start, unsigned int end, int trunc);
|
|
|
|
int ocfs2_find_leaf(struct inode *inode, struct ocfs2_extent_list *root_el,
|
|
u32 cpos, struct buffer_head **leaf_bh);
|
|
int ocfs2_search_extent_list(struct ocfs2_extent_list *el, u32 v_cluster);
|
|
|
|
/*
|
|
* Helper function to look at the # of clusters in an extent record.
|
|
*/
|
|
static inline unsigned int ocfs2_rec_clusters(struct ocfs2_extent_list *el,
|
|
struct ocfs2_extent_rec *rec)
|
|
{
|
|
/*
|
|
* Cluster count in extent records is slightly different
|
|
* between interior nodes and leaf nodes. This is to support
|
|
* unwritten extents which need a flags field in leaf node
|
|
* records, thus shrinking the available space for a clusters
|
|
* field.
|
|
*/
|
|
if (el->l_tree_depth)
|
|
return le32_to_cpu(rec->e_int_clusters);
|
|
else
|
|
return le16_to_cpu(rec->e_leaf_clusters);
|
|
}
|
|
|
|
/*
|
|
* This is only valid for leaf nodes, which are the only ones that can
|
|
* have empty extents anyway.
|
|
*/
|
|
static inline int ocfs2_is_empty_extent(struct ocfs2_extent_rec *rec)
|
|
{
|
|
return !rec->e_leaf_clusters;
|
|
}
|
|
|
|
#endif /* OCFS2_ALLOC_H */
|