localalloc.c (e63aecb651ba73dffc62f9608ee1b7ae2a0ffd4b) localalloc.c (2fbe8d1ebe004425b4f7b8bba345623d2280be82)
1/* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
3 *
4 * localalloc.c
5 *
6 * Node local data allocation
7 *
8 * Copyright (C) 2002, 2004 Oracle. All rights reserved.

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70
71static int ocfs2_local_alloc_new_window(struct ocfs2_super *osb,
72 handle_t *handle,
73 struct ocfs2_alloc_context *ac);
74
75static int ocfs2_local_alloc_slide_window(struct ocfs2_super *osb,
76 struct inode *local_alloc_inode);
77
1/* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
3 *
4 * localalloc.c
5 *
6 * Node local data allocation
7 *
8 * Copyright (C) 2002, 2004 Oracle. All rights reserved.

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70
71static int ocfs2_local_alloc_new_window(struct ocfs2_super *osb,
72 handle_t *handle,
73 struct ocfs2_alloc_context *ac);
74
75static int ocfs2_local_alloc_slide_window(struct ocfs2_super *osb,
76 struct inode *local_alloc_inode);
77
78/*
79 * Determine how large our local alloc window should be, in bits.
80 *
81 * These values (and the behavior in ocfs2_alloc_should_use_local) have
82 * been chosen so that most allocations, including new block groups go
83 * through local alloc.
84 */
85static inline int ocfs2_local_alloc_window_bits(struct ocfs2_super *osb)
86{
78static inline int ocfs2_local_alloc_window_bits(struct ocfs2_super *osb)
79{
87 BUG_ON(osb->s_clustersize_bits < 12);
80 BUG_ON(osb->s_clustersize_bits > 20);
88
81
89 return 2048 >> (osb->s_clustersize_bits - 12);
82 /* Size local alloc windows by the megabyte */
83 return osb->local_alloc_size << (20 - osb->s_clustersize_bits);
90}
91
92/*
93 * Tell us whether a given allocation should use the local alloc
94 * file. Otherwise, it has to go to the main bitmap.
95 */
96int ocfs2_alloc_should_use_local(struct ocfs2_super *osb, u64 bits)
97{
98 int la_bits = ocfs2_local_alloc_window_bits(osb);
84}
85
86/*
87 * Tell us whether a given allocation should use the local alloc
88 * file. Otherwise, it has to go to the main bitmap.
89 */
90int ocfs2_alloc_should_use_local(struct ocfs2_super *osb, u64 bits)
91{
92 int la_bits = ocfs2_local_alloc_window_bits(osb);
93 int ret = 0;
99
100 if (osb->local_alloc_state != OCFS2_LA_ENABLED)
94
95 if (osb->local_alloc_state != OCFS2_LA_ENABLED)
101 return 0;
96 goto bail;
102
103 /* la_bits should be at least twice the size (in clusters) of
104 * a new block group. We want to be sure block group
105 * allocations go through the local alloc, so allow an
106 * allocation to take up to half the bitmap. */
107 if (bits > (la_bits / 2))
97
98 /* la_bits should be at least twice the size (in clusters) of
99 * a new block group. We want to be sure block group
100 * allocations go through the local alloc, so allow an
101 * allocation to take up to half the bitmap. */
102 if (bits > (la_bits / 2))
108 return 0;
103 goto bail;
109
104
110 return 1;
105 ret = 1;
106bail:
107 mlog(0, "state=%d, bits=%llu, la_bits=%d, ret=%d\n",
108 osb->local_alloc_state, (unsigned long long)bits, la_bits, ret);
109 return ret;
111}
112
113int ocfs2_load_local_alloc(struct ocfs2_super *osb)
114{
115 int status = 0;
116 struct ocfs2_dinode *alloc = NULL;
117 struct buffer_head *alloc_bh = NULL;
118 u32 num_used;
119 struct inode *inode = NULL;
120 struct ocfs2_local_alloc *la;
121
122 mlog_entry_void();
123
110}
111
112int ocfs2_load_local_alloc(struct ocfs2_super *osb)
113{
114 int status = 0;
115 struct ocfs2_dinode *alloc = NULL;
116 struct buffer_head *alloc_bh = NULL;
117 u32 num_used;
118 struct inode *inode = NULL;
119 struct ocfs2_local_alloc *la;
120
121 mlog_entry_void();
122
123 if (ocfs2_mount_local(osb))
124 goto bail;
125
126 if (osb->local_alloc_size == 0)
127 goto bail;
128
129 if (ocfs2_local_alloc_window_bits(osb) >= osb->bitmap_cpg) {
130 mlog(ML_NOTICE, "Requested local alloc window %d is larger "
131 "than max possible %u. Using defaults.\n",
132 ocfs2_local_alloc_window_bits(osb), (osb->bitmap_cpg - 1));
133 osb->local_alloc_size = OCFS2_DEFAULT_LOCAL_ALLOC_SIZE;
134 }
135
124 /* read the alloc off disk */
125 inode = ocfs2_get_system_file_inode(osb, LOCAL_ALLOC_SYSTEM_INODE,
126 osb->slot_num);
127 if (!inode) {
128 status = -EINVAL;
129 mlog_errno(status);
130 goto bail;
131 }

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176
177bail:
178 if (status < 0)
179 if (alloc_bh)
180 brelse(alloc_bh);
181 if (inode)
182 iput(inode);
183
136 /* read the alloc off disk */
137 inode = ocfs2_get_system_file_inode(osb, LOCAL_ALLOC_SYSTEM_INODE,
138 osb->slot_num);
139 if (!inode) {
140 status = -EINVAL;
141 mlog_errno(status);
142 goto bail;
143 }

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188
189bail:
190 if (status < 0)
191 if (alloc_bh)
192 brelse(alloc_bh);
193 if (inode)
194 iput(inode);
195
196 mlog(0, "Local alloc window bits = %d\n",
197 ocfs2_local_alloc_window_bits(osb));
198
184 mlog_exit(status);
185 return status;
186}
187
188/*
189 * return any unused bits to the bitmap and write out a clean
190 * local_alloc.
191 *

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516 ac->ac_bh = osb->local_alloc_bh;
517 status = 0;
518bail:
519 if (status < 0 && local_alloc_inode) {
520 mutex_unlock(&local_alloc_inode->i_mutex);
521 iput(local_alloc_inode);
522 }
523
199 mlog_exit(status);
200 return status;
201}
202
203/*
204 * return any unused bits to the bitmap and write out a clean
205 * local_alloc.
206 *

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531 ac->ac_bh = osb->local_alloc_bh;
532 status = 0;
533bail:
534 if (status < 0 && local_alloc_inode) {
535 mutex_unlock(&local_alloc_inode->i_mutex);
536 iput(local_alloc_inode);
537 }
538
539 mlog(0, "bits=%d, slot=%d, ret=%d\n", bits_wanted, osb->slot_num,
540 status);
541
524 mlog_exit(status);
525 return status;
526}
527
528int ocfs2_claim_local_alloc_bits(struct ocfs2_super *osb,
529 handle_t *handle,
530 struct ocfs2_alloc_context *ac,
531 u32 bits_wanted,

--- 445 unchanged lines hidden --- 		542 mlog_exit(status);
543 return status;
544}
545
546int ocfs2_claim_local_alloc_bits(struct ocfs2_super *osb,
547 handle_t *handle,
548 struct ocfs2_alloc_context *ac,
549 u32 bits_wanted,

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