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028ba5df TY |
1 | /* -*- mode: c; c-basic-offset: 8; -*- |
2 | * vim: noexpandtab sw=8 ts=8 sts=0: | |
3 | * | |
4 | * move_extents.c | |
5 | * | |
6 | * Copyright (C) 2011 Oracle. All rights reserved. | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU General Public | |
10 | * License version 2 as published by the Free Software Foundation. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | * General Public License for more details. | |
16 | */ | |
17 | #include <linux/fs.h> | |
18 | #include <linux/types.h> | |
19 | #include <linux/mount.h> | |
20 | #include <linux/swap.h> | |
21 | ||
22 | #include <cluster/masklog.h> | |
23 | ||
24 | #include "ocfs2.h" | |
25 | #include "ocfs2_ioctl.h" | |
26 | ||
27 | #include "alloc.h" | |
28 | #include "aops.h" | |
29 | #include "dlmglue.h" | |
30 | #include "extent_map.h" | |
31 | #include "inode.h" | |
32 | #include "journal.h" | |
33 | #include "suballoc.h" | |
34 | #include "uptodate.h" | |
35 | #include "super.h" | |
36 | #include "dir.h" | |
37 | #include "buffer_head_io.h" | |
38 | #include "sysfile.h" | |
39 | #include "suballoc.h" | |
40 | #include "refcounttree.h" | |
41 | #include "move_extents.h" | |
42 | ||
43 | struct ocfs2_move_extents_context { | |
44 | struct inode *inode; | |
45 | struct file *file; | |
46 | int auto_defrag; | |
47 | int credits; | |
48 | u32 new_phys_cpos; | |
49 | u32 clusters_moved; | |
50 | u64 refcount_loc; | |
51 | struct ocfs2_move_extents *range; | |
52 | struct ocfs2_extent_tree et; | |
53 | struct ocfs2_alloc_context *meta_ac; | |
54 | struct ocfs2_alloc_context *data_ac; | |
55 | struct ocfs2_cached_dealloc_ctxt dealloc; | |
56 | }; | |
de474ee8 TY |
57 | |
58 | /* | |
59 | * lock allocators, and reserving appropriate number of bits for | |
60 | * meta blocks and data clusters. | |
61 | * | |
62 | * in some cases, we don't need to reserve clusters, just let data_ac | |
63 | * be NULL. | |
64 | */ | |
65 | static int ocfs2_lock_allocators_move_extents(struct inode *inode, | |
66 | struct ocfs2_extent_tree *et, | |
67 | u32 clusters_to_move, | |
68 | u32 extents_to_split, | |
69 | struct ocfs2_alloc_context **meta_ac, | |
70 | struct ocfs2_alloc_context **data_ac, | |
71 | int extra_blocks, | |
72 | int *credits) | |
73 | { | |
74 | int ret, num_free_extents; | |
75 | unsigned int max_recs_needed = 2 * extents_to_split + clusters_to_move; | |
76 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
77 | ||
78 | num_free_extents = ocfs2_num_free_extents(osb, et); | |
79 | if (num_free_extents < 0) { | |
80 | ret = num_free_extents; | |
81 | mlog_errno(ret); | |
82 | goto out; | |
83 | } | |
84 | ||
85 | if (!num_free_extents || | |
86 | (ocfs2_sparse_alloc(osb) && num_free_extents < max_recs_needed)) | |
87 | extra_blocks += ocfs2_extend_meta_needed(et->et_root_el); | |
88 | ||
89 | ret = ocfs2_reserve_new_metadata_blocks(osb, extra_blocks, meta_ac); | |
90 | if (ret) { | |
91 | mlog_errno(ret); | |
92 | goto out; | |
93 | } | |
94 | ||
95 | if (data_ac) { | |
96 | ret = ocfs2_reserve_clusters(osb, clusters_to_move, data_ac); | |
97 | if (ret) { | |
98 | mlog_errno(ret); | |
99 | goto out; | |
100 | } | |
101 | } | |
102 | ||
103 | *credits += ocfs2_calc_extend_credits(osb->sb, et->et_root_el, | |
104 | clusters_to_move + 2); | |
105 | ||
106 | mlog(0, "reserve metadata_blocks: %d, data_clusters: %u, credits: %d\n", | |
107 | extra_blocks, clusters_to_move, *credits); | |
108 | out: | |
109 | if (ret) { | |
110 | if (*meta_ac) { | |
111 | ocfs2_free_alloc_context(*meta_ac); | |
112 | *meta_ac = NULL; | |
113 | } | |
114 | } | |
115 | ||
116 | return ret; | |
117 | } |