blob: 7f8af1eb02deefce69b154276b9b2c63b07bc502 [file] [log] [blame]
David Teiglandb3b94fa2006-01-16 16:50:04 +00001/*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
Bob Petersonfe6c9912008-01-28 11:13:02 -06003 * Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved.
David Teiglandb3b94fa2006-01-16 16:50:04 +00004 *
5 * This copyrighted material is made available to anyone wishing to use,
6 * modify, copy, or redistribute it subject to the terms and conditions
Steven Whitehousee9fc2aa2006-09-01 11:05:15 -04007 * of the GNU General Public License version 2.
David Teiglandb3b94fa2006-01-16 16:50:04 +00008 */
9
David Teiglandb3b94fa2006-01-16 16:50:04 +000010#include <linux/slab.h>
11#include <linux/spinlock.h>
12#include <linux/completion.h>
13#include <linux/buffer_head.h>
Steven Whitehousef42faf42006-01-30 18:34:10 +000014#include <linux/fs.h>
Steven Whitehouse5c676f62006-02-27 17:23:27 -050015#include <linux/gfs2_ondisk.h>
Bob Peterson1f466a42008-03-10 18:17:47 -050016#include <linux/prefetch.h>
Steven Whitehousef15ab562009-02-09 09:25:01 +000017#include <linux/blkdev.h>
David Teiglandb3b94fa2006-01-16 16:50:04 +000018
19#include "gfs2.h"
Steven Whitehouse5c676f62006-02-27 17:23:27 -050020#include "incore.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000021#include "glock.h"
22#include "glops.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000023#include "lops.h"
24#include "meta_io.h"
25#include "quota.h"
26#include "rgrp.h"
27#include "super.h"
28#include "trans.h"
Steven Whitehouse5c676f62006-02-27 17:23:27 -050029#include "util.h"
Benjamin Marzinski172e0452007-03-23 14:51:56 -060030#include "log.h"
Steven Whitehousec8cdf472007-06-08 10:05:33 +010031#include "inode.h"
Steven Whitehouse63997772009-06-12 08:49:20 +010032#include "trace_gfs2.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000033
Steven Whitehouse2c1e52a2006-09-05 15:41:57 -040034#define BFITNOENT ((u32)~0)
Bob Peterson6760bdc2007-07-24 14:09:32 -050035#define NO_BLOCK ((u64)~0)
Steven Whitehouse88c8ab1f2006-05-18 13:52:39 -040036
Bob Peterson1f466a42008-03-10 18:17:47 -050037#if BITS_PER_LONG == 32
38#define LBITMASK (0x55555555UL)
39#define LBITSKIP55 (0x55555555UL)
40#define LBITSKIP00 (0x00000000UL)
41#else
42#define LBITMASK (0x5555555555555555UL)
43#define LBITSKIP55 (0x5555555555555555UL)
44#define LBITSKIP00 (0x0000000000000000UL)
45#endif
46
Steven Whitehouse88c8ab1f2006-05-18 13:52:39 -040047/*
48 * These routines are used by the resource group routines (rgrp.c)
49 * to keep track of block allocation. Each block is represented by two
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -040050 * bits. So, each byte represents GFS2_NBBY (i.e. 4) blocks.
51 *
52 * 0 = Free
53 * 1 = Used (not metadata)
54 * 2 = Unlinked (still in use) inode
55 * 3 = Used (metadata)
Steven Whitehouse88c8ab1f2006-05-18 13:52:39 -040056 */
57
58static const char valid_change[16] = {
59 /* current */
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -040060 /* n */ 0, 1, 1, 1,
Steven Whitehouse88c8ab1f2006-05-18 13:52:39 -040061 /* e */ 1, 0, 0, 0,
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -040062 /* w */ 0, 0, 0, 1,
Steven Whitehouse88c8ab1f2006-05-18 13:52:39 -040063 1, 0, 0, 0
64};
65
Steven Whitehousec8cdf472007-06-08 10:05:33 +010066static u32 rgblk_search(struct gfs2_rgrpd *rgd, u32 goal,
Steven Whitehouseb45e41d2008-02-06 10:11:15 +000067 unsigned char old_state, unsigned char new_state,
68 unsigned int *n);
Steven Whitehousec8cdf472007-06-08 10:05:33 +010069
Steven Whitehouse88c8ab1f2006-05-18 13:52:39 -040070/**
71 * gfs2_setbit - Set a bit in the bitmaps
72 * @buffer: the buffer that holds the bitmaps
73 * @buflen: the length (in bytes) of the buffer
74 * @block: the block to set
75 * @new_state: the new state of the block
76 *
77 */
78
Steven Whitehouseb45e41d2008-02-06 10:11:15 +000079static inline void gfs2_setbit(struct gfs2_rgrpd *rgd, unsigned char *buf1,
80 unsigned char *buf2, unsigned int offset,
Bob Peterson95c8e172011-03-22 10:49:12 -040081 struct gfs2_bitmap *bi, u32 block,
Steven Whitehouseb45e41d2008-02-06 10:11:15 +000082 unsigned char new_state)
Steven Whitehouse88c8ab1f2006-05-18 13:52:39 -040083{
Steven Whitehouseb45e41d2008-02-06 10:11:15 +000084 unsigned char *byte1, *byte2, *end, cur_state;
Bob Peterson95c8e172011-03-22 10:49:12 -040085 unsigned int buflen = bi->bi_len;
Steven Whitehouseb45e41d2008-02-06 10:11:15 +000086 const unsigned int bit = (block % GFS2_NBBY) * GFS2_BIT_SIZE;
Steven Whitehouse88c8ab1f2006-05-18 13:52:39 -040087
Steven Whitehouseb45e41d2008-02-06 10:11:15 +000088 byte1 = buf1 + offset + (block / GFS2_NBBY);
89 end = buf1 + offset + buflen;
Steven Whitehouse88c8ab1f2006-05-18 13:52:39 -040090
Steven Whitehouseb45e41d2008-02-06 10:11:15 +000091 BUG_ON(byte1 >= end);
Steven Whitehouse88c8ab1f2006-05-18 13:52:39 -040092
Steven Whitehouseb45e41d2008-02-06 10:11:15 +000093 cur_state = (*byte1 >> bit) & GFS2_BIT_MASK;
Steven Whitehouse88c8ab1f2006-05-18 13:52:39 -040094
Steven Whitehouseb45e41d2008-02-06 10:11:15 +000095 if (unlikely(!valid_change[new_state * 4 + cur_state])) {
Bob Peterson95c8e172011-03-22 10:49:12 -040096 printk(KERN_WARNING "GFS2: buf_blk = 0x%llx old_state=%d, "
97 "new_state=%d\n",
98 (unsigned long long)block, cur_state, new_state);
99 printk(KERN_WARNING "GFS2: rgrp=0x%llx bi_start=0x%lx\n",
100 (unsigned long long)rgd->rd_addr,
101 (unsigned long)bi->bi_start);
102 printk(KERN_WARNING "GFS2: bi_offset=0x%lx bi_len=0x%lx\n",
103 (unsigned long)bi->bi_offset,
104 (unsigned long)bi->bi_len);
105 dump_stack();
Steven Whitehouse88c8ab1f2006-05-18 13:52:39 -0400106 gfs2_consist_rgrpd(rgd);
Steven Whitehouseb45e41d2008-02-06 10:11:15 +0000107 return;
108 }
109 *byte1 ^= (cur_state ^ new_state) << bit;
110
111 if (buf2) {
112 byte2 = buf2 + offset + (block / GFS2_NBBY);
113 cur_state = (*byte2 >> bit) & GFS2_BIT_MASK;
114 *byte2 ^= (cur_state ^ new_state) << bit;
115 }
Steven Whitehouse88c8ab1f2006-05-18 13:52:39 -0400116}
117
118/**
119 * gfs2_testbit - test a bit in the bitmaps
120 * @buffer: the buffer that holds the bitmaps
121 * @buflen: the length (in bytes) of the buffer
122 * @block: the block to read
123 *
124 */
125
Steven Whitehouseb45e41d2008-02-06 10:11:15 +0000126static inline unsigned char gfs2_testbit(struct gfs2_rgrpd *rgd,
127 const unsigned char *buffer,
128 unsigned int buflen, u32 block)
Steven Whitehouse88c8ab1f2006-05-18 13:52:39 -0400129{
Steven Whitehouseb45e41d2008-02-06 10:11:15 +0000130 const unsigned char *byte, *end;
131 unsigned char cur_state;
Steven Whitehouse88c8ab1f2006-05-18 13:52:39 -0400132 unsigned int bit;
133
134 byte = buffer + (block / GFS2_NBBY);
135 bit = (block % GFS2_NBBY) * GFS2_BIT_SIZE;
136 end = buffer + buflen;
137
138 gfs2_assert(rgd->rd_sbd, byte < end);
139
140 cur_state = (*byte >> bit) & GFS2_BIT_MASK;
141
142 return cur_state;
143}
144
145/**
Steven Whitehouse223b2b82009-02-17 14:13:35 +0000146 * gfs2_bit_search
147 * @ptr: Pointer to bitmap data
148 * @mask: Mask to use (normally 0x55555.... but adjusted for search start)
149 * @state: The state we are searching for
150 *
151 * We xor the bitmap data with a patter which is the bitwise opposite
152 * of what we are looking for, this gives rise to a pattern of ones
153 * wherever there is a match. Since we have two bits per entry, we
154 * take this pattern, shift it down by one place and then and it with
155 * the original. All the even bit positions (0,2,4, etc) then represent
156 * successful matches, so we mask with 0x55555..... to remove the unwanted
157 * odd bit positions.
158 *
159 * This allows searching of a whole u64 at once (32 blocks) with a
160 * single test (on 64 bit arches).
161 */
162
163static inline u64 gfs2_bit_search(const __le64 *ptr, u64 mask, u8 state)
164{
165 u64 tmp;
166 static const u64 search[] = {
Hannes Eder075ac442009-02-21 02:11:42 +0100167 [0] = 0xffffffffffffffffULL,
168 [1] = 0xaaaaaaaaaaaaaaaaULL,
169 [2] = 0x5555555555555555ULL,
170 [3] = 0x0000000000000000ULL,
Steven Whitehouse223b2b82009-02-17 14:13:35 +0000171 };
172 tmp = le64_to_cpu(*ptr) ^ search[state];
173 tmp &= (tmp >> 1);
174 tmp &= mask;
175 return tmp;
176}
177
178/**
Steven Whitehouse88c8ab1f2006-05-18 13:52:39 -0400179 * gfs2_bitfit - Search an rgrp's bitmap buffer to find a bit-pair representing
180 * a block in a given allocation state.
181 * @buffer: the buffer that holds the bitmaps
Steven Whitehouse223b2b82009-02-17 14:13:35 +0000182 * @len: the length (in bytes) of the buffer
Steven Whitehouse88c8ab1f2006-05-18 13:52:39 -0400183 * @goal: start search at this block's bit-pair (within @buffer)
Steven Whitehouse223b2b82009-02-17 14:13:35 +0000184 * @state: GFS2_BLKST_XXX the state of the block we're looking for.
Steven Whitehouse88c8ab1f2006-05-18 13:52:39 -0400185 *
186 * Scope of @goal and returned block number is only within this bitmap buffer,
187 * not entire rgrp or filesystem. @buffer will be offset from the actual
Steven Whitehouse223b2b82009-02-17 14:13:35 +0000188 * beginning of a bitmap block buffer, skipping any header structures, but
189 * headers are always a multiple of 64 bits long so that the buffer is
190 * always aligned to a 64 bit boundary.
191 *
192 * The size of the buffer is in bytes, but is it assumed that it is
Anand Gadiyarfd589a82009-07-16 17:13:03 +0200193 * always ok to read a complete multiple of 64 bits at the end
Steven Whitehouse223b2b82009-02-17 14:13:35 +0000194 * of the block in case the end is no aligned to a natural boundary.
Steven Whitehouse88c8ab1f2006-05-18 13:52:39 -0400195 *
196 * Return: the block number (bitmap buffer scope) that was found
197 */
198
Hannes Eder02ab1722009-02-21 02:12:05 +0100199static u32 gfs2_bitfit(const u8 *buf, const unsigned int len,
200 u32 goal, u8 state)
Steven Whitehouse88c8ab1f2006-05-18 13:52:39 -0400201{
Steven Whitehouse223b2b82009-02-17 14:13:35 +0000202 u32 spoint = (goal << 1) & ((8*sizeof(u64)) - 1);
203 const __le64 *ptr = ((__le64 *)buf) + (goal >> 5);
204 const __le64 *end = (__le64 *)(buf + ALIGN(len, sizeof(u64)));
205 u64 tmp;
Hannes Eder075ac442009-02-21 02:11:42 +0100206 u64 mask = 0x5555555555555555ULL;
Steven Whitehouse223b2b82009-02-17 14:13:35 +0000207 u32 bit;
Steven Whitehouse88c8ab1f2006-05-18 13:52:39 -0400208
Steven Whitehouse223b2b82009-02-17 14:13:35 +0000209 BUG_ON(state > 3);
Steven Whitehouse88c8ab1f2006-05-18 13:52:39 -0400210
Steven Whitehouse223b2b82009-02-17 14:13:35 +0000211 /* Mask off bits we don't care about at the start of the search */
212 mask <<= spoint;
213 tmp = gfs2_bit_search(ptr, mask, state);
214 ptr++;
215 while(tmp == 0 && ptr < end) {
Hannes Eder075ac442009-02-21 02:11:42 +0100216 tmp = gfs2_bit_search(ptr, 0x5555555555555555ULL, state);
Steven Whitehouse223b2b82009-02-17 14:13:35 +0000217 ptr++;
Bob Peterson1f466a42008-03-10 18:17:47 -0500218 }
Steven Whitehouse223b2b82009-02-17 14:13:35 +0000219 /* Mask off any bits which are more than len bytes from the start */
220 if (ptr == end && (len & (sizeof(u64) - 1)))
221 tmp &= (((u64)~0) >> (64 - 8*(len & (sizeof(u64) - 1))));
222 /* Didn't find anything, so return */
223 if (tmp == 0)
224 return BFITNOENT;
225 ptr--;
Steven Whitehoused8bd5042009-04-23 08:54:02 +0100226 bit = __ffs64(tmp);
Steven Whitehouse223b2b82009-02-17 14:13:35 +0000227 bit /= 2; /* two bits per entry in the bitmap */
228 return (((const unsigned char *)ptr - buf) * GFS2_NBBY) + bit;
Steven Whitehouse88c8ab1f2006-05-18 13:52:39 -0400229}
230
231/**
232 * gfs2_bitcount - count the number of bits in a certain state
233 * @buffer: the buffer that holds the bitmaps
234 * @buflen: the length (in bytes) of the buffer
235 * @state: the state of the block we're looking for
236 *
237 * Returns: The number of bits
238 */
239
Steven Whitehouse110acf32008-01-29 13:30:20 +0000240static u32 gfs2_bitcount(struct gfs2_rgrpd *rgd, const u8 *buffer,
241 unsigned int buflen, u8 state)
Steven Whitehouse88c8ab1f2006-05-18 13:52:39 -0400242{
Steven Whitehouse110acf32008-01-29 13:30:20 +0000243 const u8 *byte = buffer;
244 const u8 *end = buffer + buflen;
245 const u8 state1 = state << 2;
246 const u8 state2 = state << 4;
247 const u8 state3 = state << 6;
Steven Whitehousecd915492006-09-04 12:49:07 -0400248 u32 count = 0;
Steven Whitehouse88c8ab1f2006-05-18 13:52:39 -0400249
250 for (; byte < end; byte++) {
251 if (((*byte) & 0x03) == state)
252 count++;
253 if (((*byte) & 0x0C) == state1)
254 count++;
255 if (((*byte) & 0x30) == state2)
256 count++;
257 if (((*byte) & 0xC0) == state3)
258 count++;
259 }
260
261 return count;
262}
263
David Teiglandb3b94fa2006-01-16 16:50:04 +0000264/**
265 * gfs2_rgrp_verify - Verify that a resource group is consistent
266 * @sdp: the filesystem
267 * @rgd: the rgrp
268 *
269 */
270
271void gfs2_rgrp_verify(struct gfs2_rgrpd *rgd)
272{
273 struct gfs2_sbd *sdp = rgd->rd_sbd;
274 struct gfs2_bitmap *bi = NULL;
Steven Whitehousebb8d8a62007-06-01 14:11:58 +0100275 u32 length = rgd->rd_length;
Steven Whitehousecd915492006-09-04 12:49:07 -0400276 u32 count[4], tmp;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000277 int buf, x;
278
Steven Whitehousecd915492006-09-04 12:49:07 -0400279 memset(count, 0, 4 * sizeof(u32));
David Teiglandb3b94fa2006-01-16 16:50:04 +0000280
281 /* Count # blocks in each of 4 possible allocation states */
282 for (buf = 0; buf < length; buf++) {
283 bi = rgd->rd_bits + buf;
284 for (x = 0; x < 4; x++)
285 count[x] += gfs2_bitcount(rgd,
286 bi->bi_bh->b_data +
287 bi->bi_offset,
288 bi->bi_len, x);
289 }
290
Steven Whitehousecfc8b542008-11-04 10:25:13 +0000291 if (count[0] != rgd->rd_free) {
David Teiglandb3b94fa2006-01-16 16:50:04 +0000292 if (gfs2_consist_rgrpd(rgd))
293 fs_err(sdp, "free data mismatch: %u != %u\n",
Steven Whitehousecfc8b542008-11-04 10:25:13 +0000294 count[0], rgd->rd_free);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000295 return;
296 }
297
Steven Whitehouse73f74942008-11-04 10:32:57 +0000298 tmp = rgd->rd_data - rgd->rd_free - rgd->rd_dinodes;
Benjamin Marzinski6b946172009-07-10 18:13:26 -0500299 if (count[1] != tmp) {
David Teiglandb3b94fa2006-01-16 16:50:04 +0000300 if (gfs2_consist_rgrpd(rgd))
301 fs_err(sdp, "used data mismatch: %u != %u\n",
302 count[1], tmp);
303 return;
304 }
305
Benjamin Marzinski6b946172009-07-10 18:13:26 -0500306 if (count[2] + count[3] != rgd->rd_dinodes) {
David Teiglandb3b94fa2006-01-16 16:50:04 +0000307 if (gfs2_consist_rgrpd(rgd))
308 fs_err(sdp, "used metadata mismatch: %u != %u\n",
Benjamin Marzinski6b946172009-07-10 18:13:26 -0500309 count[2] + count[3], rgd->rd_dinodes);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000310 return;
311 }
312}
313
Steven Whitehousebb8d8a62007-06-01 14:11:58 +0100314static inline int rgrp_contains_block(struct gfs2_rgrpd *rgd, u64 block)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000315{
Steven Whitehousebb8d8a62007-06-01 14:11:58 +0100316 u64 first = rgd->rd_data0;
317 u64 last = first + rgd->rd_data;
Steven Whitehouse16910422006-09-05 11:15:45 -0400318 return first <= block && block < last;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000319}
320
321/**
322 * gfs2_blk2rgrpd - Find resource group for a given data/meta block number
323 * @sdp: The GFS2 superblock
324 * @n: The data block number
325 *
326 * Returns: The resource group, or NULL if not found
327 */
328
Steven Whitehousecd915492006-09-04 12:49:07 -0400329struct gfs2_rgrpd *gfs2_blk2rgrpd(struct gfs2_sbd *sdp, u64 blk)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000330{
331 struct gfs2_rgrpd *rgd;
332
333 spin_lock(&sdp->sd_rindex_spin);
334
335 list_for_each_entry(rgd, &sdp->sd_rindex_mru_list, rd_list_mru) {
Steven Whitehousebb8d8a62007-06-01 14:11:58 +0100336 if (rgrp_contains_block(rgd, blk)) {
David Teiglandb3b94fa2006-01-16 16:50:04 +0000337 list_move(&rgd->rd_list_mru, &sdp->sd_rindex_mru_list);
338 spin_unlock(&sdp->sd_rindex_spin);
339 return rgd;
340 }
341 }
342
343 spin_unlock(&sdp->sd_rindex_spin);
344
345 return NULL;
346}
347
348/**
349 * gfs2_rgrpd_get_first - get the first Resource Group in the filesystem
350 * @sdp: The GFS2 superblock
351 *
352 * Returns: The first rgrp in the filesystem
353 */
354
355struct gfs2_rgrpd *gfs2_rgrpd_get_first(struct gfs2_sbd *sdp)
356{
357 gfs2_assert(sdp, !list_empty(&sdp->sd_rindex_list));
358 return list_entry(sdp->sd_rindex_list.next, struct gfs2_rgrpd, rd_list);
359}
360
361/**
362 * gfs2_rgrpd_get_next - get the next RG
363 * @rgd: A RG
364 *
365 * Returns: The next rgrp
366 */
367
368struct gfs2_rgrpd *gfs2_rgrpd_get_next(struct gfs2_rgrpd *rgd)
369{
370 if (rgd->rd_list.next == &rgd->rd_sbd->sd_rindex_list)
371 return NULL;
372 return list_entry(rgd->rd_list.next, struct gfs2_rgrpd, rd_list);
373}
374
375static void clear_rgrpdi(struct gfs2_sbd *sdp)
376{
377 struct list_head *head;
378 struct gfs2_rgrpd *rgd;
379 struct gfs2_glock *gl;
380
381 spin_lock(&sdp->sd_rindex_spin);
382 sdp->sd_rindex_forward = NULL;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000383 spin_unlock(&sdp->sd_rindex_spin);
384
385 head = &sdp->sd_rindex_list;
386 while (!list_empty(head)) {
387 rgd = list_entry(head->next, struct gfs2_rgrpd, rd_list);
388 gl = rgd->rd_gl;
389
390 list_del(&rgd->rd_list);
391 list_del(&rgd->rd_list_mru);
392
393 if (gl) {
Steven Whitehouse5c676f62006-02-27 17:23:27 -0500394 gl->gl_object = NULL;
Steven Whitehouse29687a22011-03-30 16:33:25 +0100395 gfs2_glock_add_to_lru(gl);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000396 gfs2_glock_put(gl);
397 }
398
399 kfree(rgd->rd_bits);
Bob Peterson6bdd9be2008-01-28 17:20:26 -0600400 kmem_cache_free(gfs2_rgrpd_cachep, rgd);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000401 }
402}
403
404void gfs2_clear_rgrpd(struct gfs2_sbd *sdp)
405{
Steven Whitehousef55ab262006-02-21 12:51:39 +0000406 mutex_lock(&sdp->sd_rindex_mutex);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000407 clear_rgrpdi(sdp);
Steven Whitehousef55ab262006-02-21 12:51:39 +0000408 mutex_unlock(&sdp->sd_rindex_mutex);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000409}
410
Steven Whitehousebb8d8a62007-06-01 14:11:58 +0100411static void gfs2_rindex_print(const struct gfs2_rgrpd *rgd)
412{
413 printk(KERN_INFO " ri_addr = %llu\n", (unsigned long long)rgd->rd_addr);
414 printk(KERN_INFO " ri_length = %u\n", rgd->rd_length);
415 printk(KERN_INFO " ri_data0 = %llu\n", (unsigned long long)rgd->rd_data0);
416 printk(KERN_INFO " ri_data = %u\n", rgd->rd_data);
417 printk(KERN_INFO " ri_bitbytes = %u\n", rgd->rd_bitbytes);
418}
419
David Teiglandb3b94fa2006-01-16 16:50:04 +0000420/**
421 * gfs2_compute_bitstructs - Compute the bitmap sizes
422 * @rgd: The resource group descriptor
423 *
424 * Calculates bitmap descriptors, one for each block that contains bitmap data
425 *
426 * Returns: errno
427 */
428
429static int compute_bitstructs(struct gfs2_rgrpd *rgd)
430{
431 struct gfs2_sbd *sdp = rgd->rd_sbd;
432 struct gfs2_bitmap *bi;
Steven Whitehousebb8d8a62007-06-01 14:11:58 +0100433 u32 length = rgd->rd_length; /* # blocks in hdr & bitmap */
Steven Whitehousecd915492006-09-04 12:49:07 -0400434 u32 bytes_left, bytes;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000435 int x;
436
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400437 if (!length)
438 return -EINVAL;
439
Steven Whitehousedd894be2006-07-27 14:29:00 -0400440 rgd->rd_bits = kcalloc(length, sizeof(struct gfs2_bitmap), GFP_NOFS);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000441 if (!rgd->rd_bits)
442 return -ENOMEM;
443
Steven Whitehousebb8d8a62007-06-01 14:11:58 +0100444 bytes_left = rgd->rd_bitbytes;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000445
446 for (x = 0; x < length; x++) {
447 bi = rgd->rd_bits + x;
448
Steven Whitehouse60a0b8f2009-05-21 12:23:12 +0100449 bi->bi_flags = 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000450 /* small rgrp; bitmap stored completely in header block */
451 if (length == 1) {
452 bytes = bytes_left;
453 bi->bi_offset = sizeof(struct gfs2_rgrp);
454 bi->bi_start = 0;
455 bi->bi_len = bytes;
456 /* header block */
457 } else if (x == 0) {
458 bytes = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_rgrp);
459 bi->bi_offset = sizeof(struct gfs2_rgrp);
460 bi->bi_start = 0;
461 bi->bi_len = bytes;
462 /* last block */
463 } else if (x + 1 == length) {
464 bytes = bytes_left;
465 bi->bi_offset = sizeof(struct gfs2_meta_header);
Steven Whitehousebb8d8a62007-06-01 14:11:58 +0100466 bi->bi_start = rgd->rd_bitbytes - bytes_left;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000467 bi->bi_len = bytes;
468 /* other blocks */
469 } else {
Steven Whitehouse568f4c92006-02-27 12:00:42 -0500470 bytes = sdp->sd_sb.sb_bsize -
471 sizeof(struct gfs2_meta_header);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000472 bi->bi_offset = sizeof(struct gfs2_meta_header);
Steven Whitehousebb8d8a62007-06-01 14:11:58 +0100473 bi->bi_start = rgd->rd_bitbytes - bytes_left;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000474 bi->bi_len = bytes;
475 }
476
477 bytes_left -= bytes;
478 }
479
480 if (bytes_left) {
481 gfs2_consist_rgrpd(rgd);
482 return -EIO;
483 }
484 bi = rgd->rd_bits + (length - 1);
Steven Whitehousebb8d8a62007-06-01 14:11:58 +0100485 if ((bi->bi_start + bi->bi_len) * GFS2_NBBY != rgd->rd_data) {
David Teiglandb3b94fa2006-01-16 16:50:04 +0000486 if (gfs2_consist_rgrpd(rgd)) {
Steven Whitehousebb8d8a62007-06-01 14:11:58 +0100487 gfs2_rindex_print(rgd);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000488 fs_err(sdp, "start=%u len=%u offset=%u\n",
489 bi->bi_start, bi->bi_len, bi->bi_offset);
490 }
491 return -EIO;
492 }
493
494 return 0;
495}
496
497/**
Robert Peterson7ae8fa82007-05-09 09:37:57 -0500498 * gfs2_ri_total - Total up the file system space, according to the rindex.
499 *
500 */
501u64 gfs2_ri_total(struct gfs2_sbd *sdp)
502{
503 u64 total_data = 0;
504 struct inode *inode = sdp->sd_rindex;
505 struct gfs2_inode *ip = GFS2_I(inode);
Robert Peterson7ae8fa82007-05-09 09:37:57 -0500506 char buf[sizeof(struct gfs2_rindex)];
507 struct file_ra_state ra_state;
508 int error, rgrps;
509
510 mutex_lock(&sdp->sd_rindex_mutex);
511 file_ra_state_init(&ra_state, inode->i_mapping);
512 for (rgrps = 0;; rgrps++) {
513 loff_t pos = rgrps * sizeof(struct gfs2_rindex);
514
Bob Petersonbcd72782010-12-07 13:58:56 -0500515 if (pos + sizeof(struct gfs2_rindex) > i_size_read(inode))
Robert Peterson7ae8fa82007-05-09 09:37:57 -0500516 break;
517 error = gfs2_internal_read(ip, &ra_state, buf, &pos,
518 sizeof(struct gfs2_rindex));
519 if (error != sizeof(struct gfs2_rindex))
520 break;
Steven Whitehousebb8d8a62007-06-01 14:11:58 +0100521 total_data += be32_to_cpu(((struct gfs2_rindex *)buf)->ri_data);
Robert Peterson7ae8fa82007-05-09 09:37:57 -0500522 }
523 mutex_unlock(&sdp->sd_rindex_mutex);
524 return total_data;
525}
526
Steven Whitehousebb8d8a62007-06-01 14:11:58 +0100527static void gfs2_rindex_in(struct gfs2_rgrpd *rgd, const void *buf)
528{
529 const struct gfs2_rindex *str = buf;
530
531 rgd->rd_addr = be64_to_cpu(str->ri_addr);
532 rgd->rd_length = be32_to_cpu(str->ri_length);
533 rgd->rd_data0 = be64_to_cpu(str->ri_data0);
534 rgd->rd_data = be32_to_cpu(str->ri_data);
535 rgd->rd_bitbytes = be32_to_cpu(str->ri_bitbytes);
536}
537
Robert Peterson7ae8fa82007-05-09 09:37:57 -0500538/**
Robert Peterson6c532672007-05-10 16:54:38 -0500539 * read_rindex_entry - Pull in a new resource index entry from the disk
David Teiglandb3b94fa2006-01-16 16:50:04 +0000540 * @gl: The glock covering the rindex inode
541 *
Robert Peterson6c532672007-05-10 16:54:38 -0500542 * Returns: 0 on success, error code otherwise
543 */
544
545static int read_rindex_entry(struct gfs2_inode *ip,
546 struct file_ra_state *ra_state)
547{
548 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
549 loff_t pos = sdp->sd_rgrps * sizeof(struct gfs2_rindex);
550 char buf[sizeof(struct gfs2_rindex)];
551 int error;
552 struct gfs2_rgrpd *rgd;
553
554 error = gfs2_internal_read(ip, ra_state, buf, &pos,
555 sizeof(struct gfs2_rindex));
556 if (!error)
557 return 0;
558 if (error != sizeof(struct gfs2_rindex)) {
559 if (error > 0)
560 error = -EIO;
561 return error;
562 }
563
Bob Peterson6bdd9be2008-01-28 17:20:26 -0600564 rgd = kmem_cache_zalloc(gfs2_rgrpd_cachep, GFP_NOFS);
Robert Peterson6c532672007-05-10 16:54:38 -0500565 error = -ENOMEM;
566 if (!rgd)
567 return error;
568
569 mutex_init(&rgd->rd_mutex);
570 lops_init_le(&rgd->rd_le, &gfs2_rg_lops);
571 rgd->rd_sbd = sdp;
572
573 list_add_tail(&rgd->rd_list, &sdp->sd_rindex_list);
574 list_add_tail(&rgd->rd_list_mru, &sdp->sd_rindex_mru_list);
575
Steven Whitehousebb8d8a62007-06-01 14:11:58 +0100576 gfs2_rindex_in(rgd, buf);
Robert Peterson6c532672007-05-10 16:54:38 -0500577 error = compute_bitstructs(rgd);
578 if (error)
579 return error;
580
Steven Whitehousebb8d8a62007-06-01 14:11:58 +0100581 error = gfs2_glock_get(sdp, rgd->rd_addr,
Robert Peterson6c532672007-05-10 16:54:38 -0500582 &gfs2_rgrp_glops, CREATE, &rgd->rd_gl);
583 if (error)
584 return error;
585
586 rgd->rd_gl->gl_object = rgd;
Bob Petersoncf45b752008-01-31 10:31:39 -0600587 rgd->rd_flags &= ~GFS2_RDF_UPTODATE;
Robert Peterson6c532672007-05-10 16:54:38 -0500588 return error;
589}
590
591/**
592 * gfs2_ri_update - Pull in a new resource index from the disk
593 * @ip: pointer to the rindex inode
594 *
David Teiglandb3b94fa2006-01-16 16:50:04 +0000595 * Returns: 0 on successful update, error code otherwise
596 */
597
Benjamin Marzinski086d8332010-11-23 23:52:55 -0600598int gfs2_ri_update(struct gfs2_inode *ip)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000599{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400600 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
601 struct inode *inode = &ip->i_inode;
Steven Whitehousef42faf42006-01-30 18:34:10 +0000602 struct file_ra_state ra_state;
Steven Whitehousea2e0f792010-08-11 09:53:11 +0100603 u64 rgrp_count = i_size_read(inode);
Benjamin Marzinski39211202010-08-20 00:21:02 -0500604 struct gfs2_rgrpd *rgd;
605 unsigned int max_data = 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000606 int error;
607
Steven Whitehouse7fe3ec62010-01-29 15:20:34 +0000608 do_div(rgrp_count, sizeof(struct gfs2_rindex));
David Teiglandb3b94fa2006-01-16 16:50:04 +0000609 clear_rgrpdi(sdp);
610
Steven Whitehousef42faf42006-01-30 18:34:10 +0000611 file_ra_state_init(&ra_state, inode->i_mapping);
Robert Petersoncd81a4b2007-05-14 12:42:18 -0500612 for (sdp->sd_rgrps = 0; sdp->sd_rgrps < rgrp_count; sdp->sd_rgrps++) {
Robert Peterson6c532672007-05-10 16:54:38 -0500613 error = read_rindex_entry(ip, &ra_state);
614 if (error) {
615 clear_rgrpdi(sdp);
616 return error;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000617 }
David Teiglandb3b94fa2006-01-16 16:50:04 +0000618 }
619
Benjamin Marzinski39211202010-08-20 00:21:02 -0500620 list_for_each_entry(rgd, &sdp->sd_rindex_list, rd_list)
621 if (rgd->rd_data > max_data)
622 max_data = rgd->rd_data;
623 sdp->sd_max_rg_data = max_data;
Bob Petersoncf45b752008-01-31 10:31:39 -0600624 sdp->sd_rindex_uptodate = 1;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000625 return 0;
Robert Peterson6c532672007-05-10 16:54:38 -0500626}
David Teiglandb3b94fa2006-01-16 16:50:04 +0000627
Robert Peterson6c532672007-05-10 16:54:38 -0500628/**
David Teiglandb3b94fa2006-01-16 16:50:04 +0000629 * gfs2_rindex_hold - Grab a lock on the rindex
630 * @sdp: The GFS2 superblock
631 * @ri_gh: the glock holder
632 *
633 * We grab a lock on the rindex inode to make sure that it doesn't
634 * change whilst we are performing an operation. We keep this lock
635 * for quite long periods of time compared to other locks. This
636 * doesn't matter, since it is shared and it is very, very rarely
637 * accessed in the exclusive mode (i.e. only when expanding the filesystem).
638 *
639 * This makes sure that we're using the latest copy of the resource index
640 * special file, which might have been updated if someone expanded the
641 * filesystem (via gfs2_grow utility), which adds new resource groups.
642 *
643 * Returns: 0 on success, error code otherwise
644 */
645
646int gfs2_rindex_hold(struct gfs2_sbd *sdp, struct gfs2_holder *ri_gh)
647{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400648 struct gfs2_inode *ip = GFS2_I(sdp->sd_rindex);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000649 struct gfs2_glock *gl = ip->i_gl;
650 int error;
651
652 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, 0, ri_gh);
653 if (error)
654 return error;
655
656 /* Read new copy from disk if we don't have the latest */
Bob Petersoncf45b752008-01-31 10:31:39 -0600657 if (!sdp->sd_rindex_uptodate) {
Steven Whitehousef55ab262006-02-21 12:51:39 +0000658 mutex_lock(&sdp->sd_rindex_mutex);
Bob Petersoncf45b752008-01-31 10:31:39 -0600659 if (!sdp->sd_rindex_uptodate) {
David Teiglandb3b94fa2006-01-16 16:50:04 +0000660 error = gfs2_ri_update(ip);
661 if (error)
662 gfs2_glock_dq_uninit(ri_gh);
663 }
Steven Whitehousef55ab262006-02-21 12:51:39 +0000664 mutex_unlock(&sdp->sd_rindex_mutex);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000665 }
666
667 return error;
668}
669
Bob Peterson42d52e32008-01-28 18:38:07 -0600670static void gfs2_rgrp_in(struct gfs2_rgrpd *rgd, const void *buf)
Steven Whitehousebb8d8a62007-06-01 14:11:58 +0100671{
672 const struct gfs2_rgrp *str = buf;
Bob Peterson42d52e32008-01-28 18:38:07 -0600673 u32 rg_flags;
Steven Whitehousebb8d8a62007-06-01 14:11:58 +0100674
Bob Peterson42d52e32008-01-28 18:38:07 -0600675 rg_flags = be32_to_cpu(str->rg_flags);
Steven Whitehouse09010972009-05-20 10:48:47 +0100676 rg_flags &= ~GFS2_RDF_MASK;
Steven Whitehouse1ce97e52009-05-21 15:18:19 +0100677 rgd->rd_flags &= GFS2_RDF_MASK;
678 rgd->rd_flags |= rg_flags;
Steven Whitehousecfc8b542008-11-04 10:25:13 +0000679 rgd->rd_free = be32_to_cpu(str->rg_free);
Steven Whitehouse73f74942008-11-04 10:32:57 +0000680 rgd->rd_dinodes = be32_to_cpu(str->rg_dinodes);
Steven Whitehoused8b71f72008-11-04 10:19:03 +0000681 rgd->rd_igeneration = be64_to_cpu(str->rg_igeneration);
Steven Whitehousebb8d8a62007-06-01 14:11:58 +0100682}
683
Bob Peterson42d52e32008-01-28 18:38:07 -0600684static void gfs2_rgrp_out(struct gfs2_rgrpd *rgd, void *buf)
Steven Whitehousebb8d8a62007-06-01 14:11:58 +0100685{
686 struct gfs2_rgrp *str = buf;
687
Steven Whitehouse09010972009-05-20 10:48:47 +0100688 str->rg_flags = cpu_to_be32(rgd->rd_flags & ~GFS2_RDF_MASK);
Steven Whitehousecfc8b542008-11-04 10:25:13 +0000689 str->rg_free = cpu_to_be32(rgd->rd_free);
Steven Whitehouse73f74942008-11-04 10:32:57 +0000690 str->rg_dinodes = cpu_to_be32(rgd->rd_dinodes);
Steven Whitehousebb8d8a62007-06-01 14:11:58 +0100691 str->__pad = cpu_to_be32(0);
Steven Whitehoused8b71f72008-11-04 10:19:03 +0000692 str->rg_igeneration = cpu_to_be64(rgd->rd_igeneration);
Steven Whitehousebb8d8a62007-06-01 14:11:58 +0100693 memset(&str->rg_reserved, 0, sizeof(str->rg_reserved));
694}
695
David Teiglandb3b94fa2006-01-16 16:50:04 +0000696/**
697 * gfs2_rgrp_bh_get - Read in a RG's header and bitmaps
698 * @rgd: the struct gfs2_rgrpd describing the RG to read in
699 *
700 * Read in all of a Resource Group's header and bitmap blocks.
701 * Caller must eventually call gfs2_rgrp_relse() to free the bitmaps.
702 *
703 * Returns: errno
704 */
705
706int gfs2_rgrp_bh_get(struct gfs2_rgrpd *rgd)
707{
708 struct gfs2_sbd *sdp = rgd->rd_sbd;
709 struct gfs2_glock *gl = rgd->rd_gl;
Steven Whitehousebb8d8a62007-06-01 14:11:58 +0100710 unsigned int length = rgd->rd_length;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000711 struct gfs2_bitmap *bi;
712 unsigned int x, y;
713 int error;
714
Steven Whitehousef55ab262006-02-21 12:51:39 +0000715 mutex_lock(&rgd->rd_mutex);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000716
717 spin_lock(&sdp->sd_rindex_spin);
718 if (rgd->rd_bh_count) {
719 rgd->rd_bh_count++;
720 spin_unlock(&sdp->sd_rindex_spin);
Steven Whitehousef55ab262006-02-21 12:51:39 +0000721 mutex_unlock(&rgd->rd_mutex);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000722 return 0;
723 }
724 spin_unlock(&sdp->sd_rindex_spin);
725
726 for (x = 0; x < length; x++) {
727 bi = rgd->rd_bits + x;
Steven Whitehousebb8d8a62007-06-01 14:11:58 +0100728 error = gfs2_meta_read(gl, rgd->rd_addr + x, 0, &bi->bi_bh);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000729 if (error)
730 goto fail;
731 }
732
733 for (y = length; y--;) {
734 bi = rgd->rd_bits + y;
Steven Whitehouse7276b3b2006-09-21 17:05:23 -0400735 error = gfs2_meta_wait(sdp, bi->bi_bh);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000736 if (error)
737 goto fail;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400738 if (gfs2_metatype_check(sdp, bi->bi_bh, y ? GFS2_METATYPE_RB :
David Teiglandb3b94fa2006-01-16 16:50:04 +0000739 GFS2_METATYPE_RG)) {
740 error = -EIO;
741 goto fail;
742 }
743 }
744
Bob Petersoncf45b752008-01-31 10:31:39 -0600745 if (!(rgd->rd_flags & GFS2_RDF_UPTODATE)) {
Steven Whitehouse60a0b8f2009-05-21 12:23:12 +0100746 for (x = 0; x < length; x++)
747 clear_bit(GBF_FULL, &rgd->rd_bits[x].bi_flags);
Bob Peterson42d52e32008-01-28 18:38:07 -0600748 gfs2_rgrp_in(rgd, (rgd->rd_bits[0].bi_bh)->b_data);
Steven Whitehouse1ce97e52009-05-21 15:18:19 +0100749 rgd->rd_flags |= (GFS2_RDF_UPTODATE | GFS2_RDF_CHECK);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000750 }
751
752 spin_lock(&sdp->sd_rindex_spin);
Steven Whitehousecfc8b542008-11-04 10:25:13 +0000753 rgd->rd_free_clone = rgd->rd_free;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000754 rgd->rd_bh_count++;
755 spin_unlock(&sdp->sd_rindex_spin);
756
Steven Whitehousef55ab262006-02-21 12:51:39 +0000757 mutex_unlock(&rgd->rd_mutex);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000758
759 return 0;
760
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400761fail:
David Teiglandb3b94fa2006-01-16 16:50:04 +0000762 while (x--) {
763 bi = rgd->rd_bits + x;
764 brelse(bi->bi_bh);
765 bi->bi_bh = NULL;
766 gfs2_assert_warn(sdp, !bi->bi_clone);
767 }
Steven Whitehousef55ab262006-02-21 12:51:39 +0000768 mutex_unlock(&rgd->rd_mutex);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000769
770 return error;
771}
772
773void gfs2_rgrp_bh_hold(struct gfs2_rgrpd *rgd)
774{
775 struct gfs2_sbd *sdp = rgd->rd_sbd;
776
777 spin_lock(&sdp->sd_rindex_spin);
778 gfs2_assert_warn(rgd->rd_sbd, rgd->rd_bh_count);
779 rgd->rd_bh_count++;
780 spin_unlock(&sdp->sd_rindex_spin);
781}
782
783/**
784 * gfs2_rgrp_bh_put - Release RG bitmaps read in with gfs2_rgrp_bh_get()
785 * @rgd: the struct gfs2_rgrpd describing the RG to read in
786 *
787 */
788
789void gfs2_rgrp_bh_put(struct gfs2_rgrpd *rgd)
790{
791 struct gfs2_sbd *sdp = rgd->rd_sbd;
Steven Whitehousebb8d8a62007-06-01 14:11:58 +0100792 int x, length = rgd->rd_length;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000793
794 spin_lock(&sdp->sd_rindex_spin);
795 gfs2_assert_warn(rgd->rd_sbd, rgd->rd_bh_count);
796 if (--rgd->rd_bh_count) {
797 spin_unlock(&sdp->sd_rindex_spin);
798 return;
799 }
800
801 for (x = 0; x < length; x++) {
802 struct gfs2_bitmap *bi = rgd->rd_bits + x;
803 kfree(bi->bi_clone);
804 bi->bi_clone = NULL;
805 brelse(bi->bi_bh);
806 bi->bi_bh = NULL;
807 }
808
809 spin_unlock(&sdp->sd_rindex_spin);
810}
811
Steven Whitehousef15ab562009-02-09 09:25:01 +0000812static void gfs2_rgrp_send_discards(struct gfs2_sbd *sdp, u64 offset,
813 const struct gfs2_bitmap *bi)
814{
815 struct super_block *sb = sdp->sd_vfs;
816 struct block_device *bdev = sb->s_bdev;
817 const unsigned int sects_per_blk = sdp->sd_sb.sb_bsize /
Martin K. Petersene1defc42009-05-22 17:17:49 -0400818 bdev_logical_block_size(sb->s_bdev);
Steven Whitehousef15ab562009-02-09 09:25:01 +0000819 u64 blk;
Steven Whitehouse64d576b2009-02-12 13:31:58 +0000820 sector_t start = 0;
Steven Whitehousef15ab562009-02-09 09:25:01 +0000821 sector_t nr_sects = 0;
822 int rv;
823 unsigned int x;
824
825 for (x = 0; x < bi->bi_len; x++) {
826 const u8 *orig = bi->bi_bh->b_data + bi->bi_offset + x;
827 const u8 *clone = bi->bi_clone + bi->bi_offset + x;
828 u8 diff = ~(*orig | (*orig >> 1)) & (*clone | (*clone >> 1));
829 diff &= 0x55;
830 if (diff == 0)
831 continue;
832 blk = offset + ((bi->bi_start + x) * GFS2_NBBY);
833 blk *= sects_per_blk; /* convert to sectors */
834 while(diff) {
835 if (diff & 1) {
836 if (nr_sects == 0)
837 goto start_new_extent;
838 if ((start + nr_sects) != blk) {
839 rv = blkdev_issue_discard(bdev, start,
Christoph Hellwig746cd1e2009-09-12 07:35:43 +0200840 nr_sects, GFP_NOFS,
Christoph Hellwigdd3932e2010-09-16 20:51:46 +0200841 0);
Steven Whitehousef15ab562009-02-09 09:25:01 +0000842 if (rv)
843 goto fail;
844 nr_sects = 0;
845start_new_extent:
846 start = blk;
847 }
848 nr_sects += sects_per_blk;
849 }
850 diff >>= 2;
851 blk += sects_per_blk;
852 }
853 }
854 if (nr_sects) {
Christoph Hellwigdd3932e2010-09-16 20:51:46 +0200855 rv = blkdev_issue_discard(bdev, start, nr_sects, GFP_NOFS, 0);
Steven Whitehousef15ab562009-02-09 09:25:01 +0000856 if (rv)
857 goto fail;
858 }
859 return;
860fail:
861 fs_warn(sdp, "error %d on discard request, turning discards off for this filesystem", rv);
862 sdp->sd_args.ar_discard = 0;
863}
864
David Teiglandb3b94fa2006-01-16 16:50:04 +0000865void gfs2_rgrp_repolish_clones(struct gfs2_rgrpd *rgd)
866{
867 struct gfs2_sbd *sdp = rgd->rd_sbd;
Steven Whitehousebb8d8a62007-06-01 14:11:58 +0100868 unsigned int length = rgd->rd_length;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000869 unsigned int x;
870
871 for (x = 0; x < length; x++) {
872 struct gfs2_bitmap *bi = rgd->rd_bits + x;
873 if (!bi->bi_clone)
874 continue;
Steven Whitehousef15ab562009-02-09 09:25:01 +0000875 if (sdp->sd_args.ar_discard)
876 gfs2_rgrp_send_discards(sdp, rgd->rd_data0, bi);
Steven Whitehouse60a0b8f2009-05-21 12:23:12 +0100877 clear_bit(GBF_FULL, &bi->bi_flags);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000878 memcpy(bi->bi_clone + bi->bi_offset,
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400879 bi->bi_bh->b_data + bi->bi_offset, bi->bi_len);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000880 }
881
882 spin_lock(&sdp->sd_rindex_spin);
Steven Whitehousecfc8b542008-11-04 10:25:13 +0000883 rgd->rd_free_clone = rgd->rd_free;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000884 spin_unlock(&sdp->sd_rindex_spin);
885}
886
887/**
888 * gfs2_alloc_get - get the struct gfs2_alloc structure for an inode
889 * @ip: the incore GFS2 inode structure
890 *
891 * Returns: the struct gfs2_alloc
892 */
893
894struct gfs2_alloc *gfs2_alloc_get(struct gfs2_inode *ip)
895{
Steven Whitehouse6dbd8222008-01-10 15:18:55 +0000896 BUG_ON(ip->i_alloc != NULL);
Steven Whitehouseea8d62d2010-01-29 15:48:57 +0000897 ip->i_alloc = kzalloc(sizeof(struct gfs2_alloc), GFP_NOFS);
Steven Whitehouse6dbd8222008-01-10 15:18:55 +0000898 return ip->i_alloc;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000899}
900
901/**
David Teiglandb3b94fa2006-01-16 16:50:04 +0000902 * try_rgrp_fit - See if a given reservation will fit in a given RG
903 * @rgd: the RG data
904 * @al: the struct gfs2_alloc structure describing the reservation
905 *
906 * If there's room for the requested blocks to be allocated from the RG:
David Teiglandb3b94fa2006-01-16 16:50:04 +0000907 * Sets the $al_rgd field in @al.
908 *
909 * Returns: 1 on success (it fits), 0 on failure (it doesn't fit)
910 */
911
912static int try_rgrp_fit(struct gfs2_rgrpd *rgd, struct gfs2_alloc *al)
913{
914 struct gfs2_sbd *sdp = rgd->rd_sbd;
915 int ret = 0;
916
Steven Whitehouse09010972009-05-20 10:48:47 +0100917 if (rgd->rd_flags & (GFS2_RGF_NOALLOC | GFS2_RDF_ERROR))
Steven Whitehousea43a4902007-04-02 10:48:17 +0100918 return 0;
919
David Teiglandb3b94fa2006-01-16 16:50:04 +0000920 spin_lock(&sdp->sd_rindex_spin);
921 if (rgd->rd_free_clone >= al->al_requested) {
922 al->al_rgd = rgd;
923 ret = 1;
924 }
925 spin_unlock(&sdp->sd_rindex_spin);
926
927 return ret;
928}
929
930/**
Steven Whitehousec8cdf472007-06-08 10:05:33 +0100931 * try_rgrp_unlink - Look for any unlinked, allocated, but unused inodes
932 * @rgd: The rgrp
933 *
Bob Peterson1a0eae82010-04-14 11:58:16 -0400934 * Returns: 0 if no error
935 * The inode, if one has been found, in inode.
Steven Whitehousec8cdf472007-06-08 10:05:33 +0100936 */
937
Steven Whitehouse044b9412010-11-03 20:01:07 +0000938static void try_rgrp_unlink(struct gfs2_rgrpd *rgd, u64 *last_unlinked, u64 skip)
Steven Whitehousec8cdf472007-06-08 10:05:33 +0100939{
Bob Peterson6760bdc2007-07-24 14:09:32 -0500940 u32 goal = 0, block;
Wendy Chengbb9bcf02007-06-27 17:07:08 -0400941 u64 no_addr;
Bob Peterson5f3eae72007-08-08 16:52:09 -0500942 struct gfs2_sbd *sdp = rgd->rd_sbd;
Steven Whitehouseb45e41d2008-02-06 10:11:15 +0000943 unsigned int n;
Steven Whitehouse044b9412010-11-03 20:01:07 +0000944 struct gfs2_glock *gl;
945 struct gfs2_inode *ip;
946 int error;
947 int found = 0;
Steven Whitehousec8cdf472007-06-08 10:05:33 +0100948
Steven Whitehouse044b9412010-11-03 20:01:07 +0000949 while (goal < rgd->rd_data) {
Bob Peterson5f3eae72007-08-08 16:52:09 -0500950 down_write(&sdp->sd_log_flush_lock);
Steven Whitehouseb45e41d2008-02-06 10:11:15 +0000951 n = 1;
Bob Peterson6760bdc2007-07-24 14:09:32 -0500952 block = rgblk_search(rgd, goal, GFS2_BLKST_UNLINKED,
Steven Whitehouseb45e41d2008-02-06 10:11:15 +0000953 GFS2_BLKST_UNLINKED, &n);
Bob Peterson5f3eae72007-08-08 16:52:09 -0500954 up_write(&sdp->sd_log_flush_lock);
Bob Peterson6760bdc2007-07-24 14:09:32 -0500955 if (block == BFITNOENT)
Bob Peterson24c73872007-07-12 16:58:50 -0500956 break;
Bob Peterson6760bdc2007-07-24 14:09:32 -0500957 /* rgblk_search can return a block < goal, so we need to
958 keep it marching forward. */
959 no_addr = block + rgd->rd_data0;
Bob Peterson44ad37d2011-03-17 16:19:58 -0400960 goal = max(block + 1, goal + 1);
Bob Peterson6760bdc2007-07-24 14:09:32 -0500961 if (*last_unlinked != NO_BLOCK && no_addr <= *last_unlinked)
Steven Whitehousec8cdf472007-06-08 10:05:33 +0100962 continue;
Steven Whitehouse1e19a192009-07-10 21:13:38 +0100963 if (no_addr == skip)
964 continue;
Wendy Chengbb9bcf02007-06-27 17:07:08 -0400965 *last_unlinked = no_addr;
Steven Whitehouse044b9412010-11-03 20:01:07 +0000966
967 error = gfs2_glock_get(sdp, no_addr, &gfs2_inode_glops, CREATE, &gl);
968 if (error)
969 continue;
970
971 /* If the inode is already in cache, we can ignore it here
972 * because the existing inode disposal code will deal with
973 * it when all refs have gone away. Accessing gl_object like
974 * this is not safe in general. Here it is ok because we do
975 * not dereference the pointer, and we only need an approx
976 * answer to whether it is NULL or not.
977 */
978 ip = gl->gl_object;
979
980 if (ip || queue_work(gfs2_delete_workqueue, &gl->gl_delete) == 0)
981 gfs2_glock_put(gl);
982 else
983 found++;
984
985 /* Limit reclaim to sensible number of tasks */
Bob Peterson44ad37d2011-03-17 16:19:58 -0400986 if (found > NR_CPUS)
Steven Whitehouse044b9412010-11-03 20:01:07 +0000987 return;
Steven Whitehousec8cdf472007-06-08 10:05:33 +0100988 }
989
990 rgd->rd_flags &= ~GFS2_RDF_CHECK;
Steven Whitehouse044b9412010-11-03 20:01:07 +0000991 return;
Steven Whitehousec8cdf472007-06-08 10:05:33 +0100992}
993
994/**
David Teiglandb3b94fa2006-01-16 16:50:04 +0000995 * recent_rgrp_next - get next RG from "recent" list
996 * @cur_rgd: current rgrp
David Teiglandb3b94fa2006-01-16 16:50:04 +0000997 *
998 * Returns: The next rgrp in the recent list
999 */
1000
Steven Whitehouse9cabcdb2008-07-10 15:54:12 +01001001static struct gfs2_rgrpd *recent_rgrp_next(struct gfs2_rgrpd *cur_rgd)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001002{
1003 struct gfs2_sbd *sdp = cur_rgd->rd_sbd;
1004 struct list_head *head;
1005 struct gfs2_rgrpd *rgd;
1006
1007 spin_lock(&sdp->sd_rindex_spin);
Steven Whitehouse9cabcdb2008-07-10 15:54:12 +01001008 head = &sdp->sd_rindex_mru_list;
1009 if (unlikely(cur_rgd->rd_list_mru.next == head)) {
1010 spin_unlock(&sdp->sd_rindex_spin);
1011 return NULL;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001012 }
Steven Whitehouse9cabcdb2008-07-10 15:54:12 +01001013 rgd = list_entry(cur_rgd->rd_list_mru.next, struct gfs2_rgrpd, rd_list_mru);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001014 spin_unlock(&sdp->sd_rindex_spin);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001015 return rgd;
1016}
1017
1018/**
David Teiglandb3b94fa2006-01-16 16:50:04 +00001019 * forward_rgrp_get - get an rgrp to try next from full list
1020 * @sdp: The GFS2 superblock
1021 *
1022 * Returns: The rgrp to try next
1023 */
1024
1025static struct gfs2_rgrpd *forward_rgrp_get(struct gfs2_sbd *sdp)
1026{
1027 struct gfs2_rgrpd *rgd;
1028 unsigned int journals = gfs2_jindex_size(sdp);
1029 unsigned int rg = 0, x;
1030
1031 spin_lock(&sdp->sd_rindex_spin);
1032
1033 rgd = sdp->sd_rindex_forward;
1034 if (!rgd) {
1035 if (sdp->sd_rgrps >= journals)
1036 rg = sdp->sd_rgrps * sdp->sd_jdesc->jd_jid / journals;
1037
Steven Whitehouseb8e1aab2006-08-22 16:25:50 -04001038 for (x = 0, rgd = gfs2_rgrpd_get_first(sdp); x < rg;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001039 x++, rgd = gfs2_rgrpd_get_next(rgd))
1040 /* Do Nothing */;
1041
1042 sdp->sd_rindex_forward = rgd;
1043 }
1044
1045 spin_unlock(&sdp->sd_rindex_spin);
1046
1047 return rgd;
1048}
1049
1050/**
1051 * forward_rgrp_set - set the forward rgrp pointer
1052 * @sdp: the filesystem
1053 * @rgd: The new forward rgrp
1054 *
1055 */
1056
1057static void forward_rgrp_set(struct gfs2_sbd *sdp, struct gfs2_rgrpd *rgd)
1058{
1059 spin_lock(&sdp->sd_rindex_spin);
1060 sdp->sd_rindex_forward = rgd;
1061 spin_unlock(&sdp->sd_rindex_spin);
1062}
1063
1064/**
1065 * get_local_rgrp - Choose and lock a rgrp for allocation
1066 * @ip: the inode to reserve space for
1067 * @rgp: the chosen and locked rgrp
1068 *
1069 * Try to acquire rgrp in way which avoids contending with others.
1070 *
1071 * Returns: errno
1072 */
1073
Steven Whitehouse044b9412010-11-03 20:01:07 +00001074static int get_local_rgrp(struct gfs2_inode *ip, u64 *last_unlinked)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001075{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001076 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001077 struct gfs2_rgrpd *rgd, *begin = NULL;
Steven Whitehouse6dbd8222008-01-10 15:18:55 +00001078 struct gfs2_alloc *al = ip->i_alloc;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001079 int flags = LM_FLAG_TRY;
1080 int skipped = 0;
1081 int loops = 0;
Abhijith Das292c8c12007-11-29 14:13:54 -06001082 int error, rg_locked;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001083
Steven Whitehouse9cabcdb2008-07-10 15:54:12 +01001084 rgd = gfs2_blk2rgrpd(sdp, ip->i_goal);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001085
1086 while (rgd) {
Abhijith Das292c8c12007-11-29 14:13:54 -06001087 rg_locked = 0;
1088
1089 if (gfs2_glock_is_locked_by_me(rgd->rd_gl)) {
1090 rg_locked = 1;
1091 error = 0;
1092 } else {
1093 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE,
1094 LM_FLAG_TRY, &al->al_rgd_gh);
1095 }
David Teiglandb3b94fa2006-01-16 16:50:04 +00001096 switch (error) {
1097 case 0:
1098 if (try_rgrp_fit(rgd, al))
1099 goto out;
Steven Whitehouse044b9412010-11-03 20:01:07 +00001100 if (rgd->rd_flags & GFS2_RDF_CHECK)
1101 try_rgrp_unlink(rgd, last_unlinked, ip->i_no_addr);
Abhijith Das292c8c12007-11-29 14:13:54 -06001102 if (!rg_locked)
1103 gfs2_glock_dq_uninit(&al->al_rgd_gh);
Steven Whitehouse9cabcdb2008-07-10 15:54:12 +01001104 /* fall through */
David Teiglandb3b94fa2006-01-16 16:50:04 +00001105 case GLR_TRYFAILED:
Steven Whitehouse9cabcdb2008-07-10 15:54:12 +01001106 rgd = recent_rgrp_next(rgd);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001107 break;
1108
1109 default:
Bob Petersoncc0581b2010-05-11 17:58:11 -04001110 return error;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001111 }
1112 }
1113
1114 /* Go through full list of rgrps */
1115
1116 begin = rgd = forward_rgrp_get(sdp);
1117
1118 for (;;) {
Abhijith Das292c8c12007-11-29 14:13:54 -06001119 rg_locked = 0;
1120
1121 if (gfs2_glock_is_locked_by_me(rgd->rd_gl)) {
1122 rg_locked = 1;
1123 error = 0;
1124 } else {
1125 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, flags,
1126 &al->al_rgd_gh);
1127 }
David Teiglandb3b94fa2006-01-16 16:50:04 +00001128 switch (error) {
1129 case 0:
1130 if (try_rgrp_fit(rgd, al))
1131 goto out;
Steven Whitehouse044b9412010-11-03 20:01:07 +00001132 if (rgd->rd_flags & GFS2_RDF_CHECK)
1133 try_rgrp_unlink(rgd, last_unlinked, ip->i_no_addr);
Abhijith Das292c8c12007-11-29 14:13:54 -06001134 if (!rg_locked)
1135 gfs2_glock_dq_uninit(&al->al_rgd_gh);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001136 break;
1137
1138 case GLR_TRYFAILED:
1139 skipped++;
1140 break;
1141
1142 default:
Bob Petersoncc0581b2010-05-11 17:58:11 -04001143 return error;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001144 }
1145
1146 rgd = gfs2_rgrpd_get_next(rgd);
1147 if (!rgd)
1148 rgd = gfs2_rgrpd_get_first(sdp);
1149
1150 if (rgd == begin) {
Benjamin Marzinski172e0452007-03-23 14:51:56 -06001151 if (++loops >= 3)
Bob Petersoncc0581b2010-05-11 17:58:11 -04001152 return -ENOSPC;
Benjamin Marzinski172e0452007-03-23 14:51:56 -06001153 if (!skipped)
1154 loops++;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001155 flags = 0;
Benjamin Marzinski172e0452007-03-23 14:51:56 -06001156 if (loops == 2)
1157 gfs2_log_flush(sdp, NULL);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001158 }
1159 }
1160
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001161out:
David Teiglandb3b94fa2006-01-16 16:50:04 +00001162 if (begin) {
Steven Whitehouse9cabcdb2008-07-10 15:54:12 +01001163 spin_lock(&sdp->sd_rindex_spin);
1164 list_move(&rgd->rd_list_mru, &sdp->sd_rindex_mru_list);
1165 spin_unlock(&sdp->sd_rindex_spin);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001166 rgd = gfs2_rgrpd_get_next(rgd);
1167 if (!rgd)
1168 rgd = gfs2_rgrpd_get_first(sdp);
1169 forward_rgrp_set(sdp, rgd);
1170 }
1171
Bob Petersoncc0581b2010-05-11 17:58:11 -04001172 return 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001173}
1174
1175/**
1176 * gfs2_inplace_reserve_i - Reserve space in the filesystem
1177 * @ip: the inode to reserve space for
1178 *
1179 * Returns: errno
1180 */
1181
Bob Peterson462903412010-09-30 10:34:00 -04001182int gfs2_inplace_reserve_i(struct gfs2_inode *ip, int hold_rindex,
1183 char *file, unsigned int line)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001184{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001185 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
Steven Whitehouse6dbd8222008-01-10 15:18:55 +00001186 struct gfs2_alloc *al = ip->i_alloc;
Robert Peterson7ae8fa82007-05-09 09:37:57 -05001187 int error = 0;
Steven Whitehouse044b9412010-11-03 20:01:07 +00001188 u64 last_unlinked = NO_BLOCK;
1189 int tries = 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001190
1191 if (gfs2_assert_warn(sdp, al->al_requested))
1192 return -EINVAL;
1193
Bob Peterson462903412010-09-30 10:34:00 -04001194 if (hold_rindex) {
1195 /* We need to hold the rindex unless the inode we're using is
1196 the rindex itself, in which case it's already held. */
1197 if (ip != GFS2_I(sdp->sd_rindex))
1198 error = gfs2_rindex_hold(sdp, &al->al_ri_gh);
1199 else if (!sdp->sd_rgrps) /* We may not have the rindex read
1200 in, so: */
Benjamin Marzinski0489b3f2010-11-30 09:38:35 -06001201 error = gfs2_ri_update(ip);
Steven Whitehouse044b9412010-11-03 20:01:07 +00001202 if (error)
1203 return error;
Bob Peterson462903412010-09-30 10:34:00 -04001204 }
Robert Peterson7ae8fa82007-05-09 09:37:57 -05001205
Benjamin Marzinski0489b3f2010-11-30 09:38:35 -06001206try_again:
Steven Whitehouse044b9412010-11-03 20:01:07 +00001207 do {
1208 error = get_local_rgrp(ip, &last_unlinked);
1209 /* If there is no space, flushing the log may release some */
Benjamin Marzinski0489b3f2010-11-30 09:38:35 -06001210 if (error) {
1211 if (ip == GFS2_I(sdp->sd_rindex) &&
1212 !sdp->sd_rindex_uptodate) {
1213 error = gfs2_ri_update(ip);
1214 if (error)
1215 return error;
1216 goto try_again;
1217 }
Steven Whitehouse044b9412010-11-03 20:01:07 +00001218 gfs2_log_flush(sdp, NULL);
Benjamin Marzinski0489b3f2010-11-30 09:38:35 -06001219 }
Steven Whitehouse044b9412010-11-03 20:01:07 +00001220 } while (error && tries++ < 3);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001221
Bob Petersoncc0581b2010-05-11 17:58:11 -04001222 if (error) {
Bob Peterson462903412010-09-30 10:34:00 -04001223 if (hold_rindex && ip != GFS2_I(sdp->sd_rindex))
Robert Peterson7ae8fa82007-05-09 09:37:57 -05001224 gfs2_glock_dq_uninit(&al->al_ri_gh);
Steven Whitehouse044b9412010-11-03 20:01:07 +00001225 return error;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001226 }
Steven Whitehouse044b9412010-11-03 20:01:07 +00001227
Bob Petersoned4878e2010-05-20 23:30:11 -04001228 /* no error, so we have the rgrp set in the inode's allocation. */
David Teiglandb3b94fa2006-01-16 16:50:04 +00001229 al->al_file = file;
1230 al->al_line = line;
1231
1232 return 0;
1233}
1234
1235/**
1236 * gfs2_inplace_release - release an inplace reservation
1237 * @ip: the inode the reservation was taken out on
1238 *
1239 * Release a reservation made by gfs2_inplace_reserve().
1240 */
1241
1242void gfs2_inplace_release(struct gfs2_inode *ip)
1243{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001244 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
Steven Whitehouse6dbd8222008-01-10 15:18:55 +00001245 struct gfs2_alloc *al = ip->i_alloc;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001246
1247 if (gfs2_assert_warn(sdp, al->al_alloced <= al->al_requested) == -1)
1248 fs_warn(sdp, "al_alloced = %u, al_requested = %u "
1249 "al_file = %s, al_line = %u\n",
1250 al->al_alloced, al->al_requested, al->al_file,
1251 al->al_line);
1252
1253 al->al_rgd = NULL;
Abhijith Das292c8c12007-11-29 14:13:54 -06001254 if (al->al_rgd_gh.gh_gl)
1255 gfs2_glock_dq_uninit(&al->al_rgd_gh);
Bob Peterson462903412010-09-30 10:34:00 -04001256 if (ip != GFS2_I(sdp->sd_rindex) && al->al_ri_gh.gh_gl)
Robert Peterson7ae8fa82007-05-09 09:37:57 -05001257 gfs2_glock_dq_uninit(&al->al_ri_gh);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001258}
1259
1260/**
1261 * gfs2_get_block_type - Check a block in a RG is of given type
1262 * @rgd: the resource group holding the block
1263 * @block: the block number
1264 *
1265 * Returns: The block type (GFS2_BLKST_*)
1266 */
1267
Steven Whitehouseacf7e242009-09-08 18:00:30 +01001268static unsigned char gfs2_get_block_type(struct gfs2_rgrpd *rgd, u64 block)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001269{
1270 struct gfs2_bitmap *bi = NULL;
Steven Whitehousecd915492006-09-04 12:49:07 -04001271 u32 length, rgrp_block, buf_block;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001272 unsigned int buf;
1273 unsigned char type;
1274
Steven Whitehousebb8d8a62007-06-01 14:11:58 +01001275 length = rgd->rd_length;
1276 rgrp_block = block - rgd->rd_data0;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001277
1278 for (buf = 0; buf < length; buf++) {
1279 bi = rgd->rd_bits + buf;
1280 if (rgrp_block < (bi->bi_start + bi->bi_len) * GFS2_NBBY)
1281 break;
1282 }
1283
1284 gfs2_assert(rgd->rd_sbd, buf < length);
1285 buf_block = rgrp_block - bi->bi_start * GFS2_NBBY;
1286
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001287 type = gfs2_testbit(rgd, bi->bi_bh->b_data + bi->bi_offset,
David Teiglandb3b94fa2006-01-16 16:50:04 +00001288 bi->bi_len, buf_block);
1289
1290 return type;
1291}
1292
1293/**
1294 * rgblk_search - find a block in @old_state, change allocation
1295 * state to @new_state
1296 * @rgd: the resource group descriptor
1297 * @goal: the goal block within the RG (start here to search for avail block)
1298 * @old_state: GFS2_BLKST_XXX the before-allocation state to find
1299 * @new_state: GFS2_BLKST_XXX the after-allocation block state
Steven Whitehouseb45e41d2008-02-06 10:11:15 +00001300 * @n: The extent length
David Teiglandb3b94fa2006-01-16 16:50:04 +00001301 *
1302 * Walk rgrp's bitmap to find bits that represent a block in @old_state.
1303 * Add the found bitmap buffer to the transaction.
1304 * Set the found bits to @new_state to change block's allocation state.
1305 *
1306 * This function never fails, because we wouldn't call it unless we
1307 * know (from reservation results, etc.) that a block is available.
1308 *
1309 * Scope of @goal and returned block is just within rgrp, not the whole
1310 * filesystem.
1311 *
1312 * Returns: the block number allocated
1313 */
1314
Steven Whitehousecd915492006-09-04 12:49:07 -04001315static u32 rgblk_search(struct gfs2_rgrpd *rgd, u32 goal,
Steven Whitehouseb45e41d2008-02-06 10:11:15 +00001316 unsigned char old_state, unsigned char new_state,
1317 unsigned int *n)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001318{
1319 struct gfs2_bitmap *bi = NULL;
Steven Whitehouseb45e41d2008-02-06 10:11:15 +00001320 const u32 length = rgd->rd_length;
Steven Whitehouse60a0b8f2009-05-21 12:23:12 +01001321 u32 blk = BFITNOENT;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001322 unsigned int buf, x;
Steven Whitehouseb45e41d2008-02-06 10:11:15 +00001323 const unsigned int elen = *n;
Steven Whitehouse60a0b8f2009-05-21 12:23:12 +01001324 const u8 *buffer = NULL;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001325
Steven Whitehouseb45e41d2008-02-06 10:11:15 +00001326 *n = 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001327 /* Find bitmap block that contains bits for goal block */
1328 for (buf = 0; buf < length; buf++) {
1329 bi = rgd->rd_bits + buf;
Steven Whitehouse60a0b8f2009-05-21 12:23:12 +01001330 /* Convert scope of "goal" from rgrp-wide to within found bit block */
1331 if (goal < (bi->bi_start + bi->bi_len) * GFS2_NBBY) {
1332 goal -= bi->bi_start * GFS2_NBBY;
1333 goto do_search;
1334 }
David Teiglandb3b94fa2006-01-16 16:50:04 +00001335 }
Steven Whitehouse60a0b8f2009-05-21 12:23:12 +01001336 buf = 0;
1337 goal = 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001338
Steven Whitehouse60a0b8f2009-05-21 12:23:12 +01001339do_search:
David Teiglandb3b94fa2006-01-16 16:50:04 +00001340 /* Search (up to entire) bitmap in this rgrp for allocatable block.
1341 "x <= length", instead of "x < length", because we typically start
1342 the search in the middle of a bit block, but if we can't find an
1343 allocatable block anywhere else, we want to be able wrap around and
1344 search in the first part of our first-searched bit block. */
1345 for (x = 0; x <= length; x++) {
Steven Whitehouse60a0b8f2009-05-21 12:23:12 +01001346 bi = rgd->rd_bits + buf;
1347
1348 if (test_bit(GBF_FULL, &bi->bi_flags) &&
1349 (old_state == GFS2_BLKST_FREE))
1350 goto skip;
1351
Bob Peterson5f3eae72007-08-08 16:52:09 -05001352 /* The GFS2_BLKST_UNLINKED state doesn't apply to the clone
1353 bitmaps, so we must search the originals for that. */
Steven Whitehouseb45e41d2008-02-06 10:11:15 +00001354 buffer = bi->bi_bh->b_data + bi->bi_offset;
Bob Peterson5f3eae72007-08-08 16:52:09 -05001355 if (old_state != GFS2_BLKST_UNLINKED && bi->bi_clone)
Steven Whitehouse110acf32008-01-29 13:30:20 +00001356 buffer = bi->bi_clone + bi->bi_offset;
1357
1358 blk = gfs2_bitfit(buffer, bi->bi_len, goal, old_state);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001359 if (blk != BFITNOENT)
1360 break;
1361
Steven Whitehouse60a0b8f2009-05-21 12:23:12 +01001362 if ((goal == 0) && (old_state == GFS2_BLKST_FREE))
1363 set_bit(GBF_FULL, &bi->bi_flags);
1364
David Teiglandb3b94fa2006-01-16 16:50:04 +00001365 /* Try next bitmap block (wrap back to rgrp header if at end) */
Steven Whitehouse60a0b8f2009-05-21 12:23:12 +01001366skip:
1367 buf++;
1368 buf %= length;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001369 goal = 0;
1370 }
1371
Steven Whitehouse60a0b8f2009-05-21 12:23:12 +01001372 if (blk == BFITNOENT)
1373 return blk;
1374 *n = 1;
1375 if (old_state == new_state)
1376 goto out;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001377
Steven Whitehouse60a0b8f2009-05-21 12:23:12 +01001378 gfs2_trans_add_bh(rgd->rd_gl, bi->bi_bh, 1);
1379 gfs2_setbit(rgd, bi->bi_bh->b_data, bi->bi_clone, bi->bi_offset,
Bob Peterson95c8e172011-03-22 10:49:12 -04001380 bi, blk, new_state);
Steven Whitehouse60a0b8f2009-05-21 12:23:12 +01001381 goal = blk;
1382 while (*n < elen) {
1383 goal++;
1384 if (goal >= (bi->bi_len * GFS2_NBBY))
1385 break;
1386 if (gfs2_testbit(rgd, buffer, bi->bi_len, goal) !=
1387 GFS2_BLKST_FREE)
1388 break;
1389 gfs2_setbit(rgd, bi->bi_bh->b_data, bi->bi_clone, bi->bi_offset,
Bob Peterson95c8e172011-03-22 10:49:12 -04001390 bi, goal, new_state);
Steven Whitehouse60a0b8f2009-05-21 12:23:12 +01001391 (*n)++;
1392 }
1393out:
1394 return (bi->bi_start * GFS2_NBBY) + blk;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001395}
1396
1397/**
1398 * rgblk_free - Change alloc state of given block(s)
1399 * @sdp: the filesystem
1400 * @bstart: the start of a run of blocks to free
1401 * @blen: the length of the block run (all must lie within ONE RG!)
1402 * @new_state: GFS2_BLKST_XXX the after-allocation block state
1403 *
1404 * Returns: Resource group containing the block(s)
1405 */
1406
Steven Whitehousecd915492006-09-04 12:49:07 -04001407static struct gfs2_rgrpd *rgblk_free(struct gfs2_sbd *sdp, u64 bstart,
1408 u32 blen, unsigned char new_state)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001409{
1410 struct gfs2_rgrpd *rgd;
1411 struct gfs2_bitmap *bi = NULL;
Steven Whitehousecd915492006-09-04 12:49:07 -04001412 u32 length, rgrp_blk, buf_blk;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001413 unsigned int buf;
1414
1415 rgd = gfs2_blk2rgrpd(sdp, bstart);
1416 if (!rgd) {
1417 if (gfs2_consist(sdp))
Steven Whitehouse382066d2006-05-24 10:22:09 -04001418 fs_err(sdp, "block = %llu\n", (unsigned long long)bstart);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001419 return NULL;
1420 }
1421
Steven Whitehousebb8d8a62007-06-01 14:11:58 +01001422 length = rgd->rd_length;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001423
Steven Whitehousebb8d8a62007-06-01 14:11:58 +01001424 rgrp_blk = bstart - rgd->rd_data0;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001425
1426 while (blen--) {
1427 for (buf = 0; buf < length; buf++) {
1428 bi = rgd->rd_bits + buf;
1429 if (rgrp_blk < (bi->bi_start + bi->bi_len) * GFS2_NBBY)
1430 break;
1431 }
1432
1433 gfs2_assert(rgd->rd_sbd, buf < length);
1434
1435 buf_blk = rgrp_blk - bi->bi_start * GFS2_NBBY;
1436 rgrp_blk++;
1437
1438 if (!bi->bi_clone) {
1439 bi->bi_clone = kmalloc(bi->bi_bh->b_size,
Steven Whitehousedd894be2006-07-27 14:29:00 -04001440 GFP_NOFS | __GFP_NOFAIL);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001441 memcpy(bi->bi_clone + bi->bi_offset,
1442 bi->bi_bh->b_data + bi->bi_offset,
1443 bi->bi_len);
1444 }
Steven Whitehoused4e9c4c2006-01-18 11:19:28 +00001445 gfs2_trans_add_bh(rgd->rd_gl, bi->bi_bh, 1);
Steven Whitehouseb45e41d2008-02-06 10:11:15 +00001446 gfs2_setbit(rgd, bi->bi_bh->b_data, NULL, bi->bi_offset,
Bob Peterson95c8e172011-03-22 10:49:12 -04001447 bi, buf_blk, new_state);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001448 }
1449
1450 return rgd;
1451}
1452
1453/**
Steven Whitehouse09010972009-05-20 10:48:47 +01001454 * gfs2_rgrp_dump - print out an rgrp
1455 * @seq: The iterator
1456 * @gl: The glock in question
David Teiglandb3b94fa2006-01-16 16:50:04 +00001457 *
David Teiglandb3b94fa2006-01-16 16:50:04 +00001458 */
1459
Steven Whitehouse09010972009-05-20 10:48:47 +01001460int gfs2_rgrp_dump(struct seq_file *seq, const struct gfs2_glock *gl)
1461{
1462 const struct gfs2_rgrpd *rgd = gl->gl_object;
1463 if (rgd == NULL)
1464 return 0;
1465 gfs2_print_dbg(seq, " R: n:%llu f:%02x b:%u/%u i:%u\n",
1466 (unsigned long long)rgd->rd_addr, rgd->rd_flags,
1467 rgd->rd_free, rgd->rd_free_clone, rgd->rd_dinodes);
1468 return 0;
1469}
1470
Steven Whitehouse6050b9c2009-07-31 16:19:40 +01001471static void gfs2_rgrp_error(struct gfs2_rgrpd *rgd)
1472{
1473 struct gfs2_sbd *sdp = rgd->rd_sbd;
1474 fs_warn(sdp, "rgrp %llu has an error, marking it readonly until umount\n",
Steven Whitehouse86d00632009-09-14 09:50:57 +01001475 (unsigned long long)rgd->rd_addr);
Steven Whitehouse6050b9c2009-07-31 16:19:40 +01001476 fs_warn(sdp, "umount on all nodes and run fsck.gfs2 to fix the error\n");
1477 gfs2_rgrp_dump(NULL, rgd->rd_gl);
1478 rgd->rd_flags |= GFS2_RDF_ERROR;
1479}
1480
Steven Whitehouse09010972009-05-20 10:48:47 +01001481/**
1482 * gfs2_alloc_block - Allocate one or more blocks
1483 * @ip: the inode to allocate the block for
1484 * @bn: Used to return the starting block number
1485 * @n: requested number of blocks/extent length (value/result)
1486 *
1487 * Returns: 0 or error
1488 */
1489
1490int gfs2_alloc_block(struct gfs2_inode *ip, u64 *bn, unsigned int *n)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001491{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001492 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
Steven Whitehoused9ba7612009-04-23 08:59:41 +01001493 struct buffer_head *dibh;
Steven Whitehouse6dbd8222008-01-10 15:18:55 +00001494 struct gfs2_alloc *al = ip->i_alloc;
Steven Whitehouse9a3f2362010-08-23 11:49:34 +01001495 struct gfs2_rgrpd *rgd;
Steven Whitehousecd915492006-09-04 12:49:07 -04001496 u32 goal, blk;
1497 u64 block;
Steven Whitehoused9ba7612009-04-23 08:59:41 +01001498 int error;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001499
Steven Whitehouse9a3f2362010-08-23 11:49:34 +01001500 /* Only happens if there is a bug in gfs2, return something distinctive
1501 * to ensure that it is noticed.
1502 */
1503 if (al == NULL)
1504 return -ECANCELED;
1505
1506 rgd = al->al_rgd;
1507
Steven Whitehousece276b02008-02-06 09:25:45 +00001508 if (rgrp_contains_block(rgd, ip->i_goal))
1509 goal = ip->i_goal - rgd->rd_data0;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001510 else
Steven Whitehouseac576cc2008-02-01 10:34:15 +00001511 goal = rgd->rd_last_alloc;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001512
Steven Whitehouseb45e41d2008-02-06 10:11:15 +00001513 blk = rgblk_search(rgd, goal, GFS2_BLKST_FREE, GFS2_BLKST_USED, n);
Steven Whitehouse09010972009-05-20 10:48:47 +01001514
1515 /* Since all blocks are reserved in advance, this shouldn't happen */
1516 if (blk == BFITNOENT)
1517 goto rgrp_error;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001518
Steven Whitehouseb45e41d2008-02-06 10:11:15 +00001519 rgd->rd_last_alloc = blk;
Steven Whitehousebb8d8a62007-06-01 14:11:58 +01001520 block = rgd->rd_data0 + blk;
Steven Whitehousece276b02008-02-06 09:25:45 +00001521 ip->i_goal = block;
Steven Whitehoused9ba7612009-04-23 08:59:41 +01001522 error = gfs2_meta_inode_buffer(ip, &dibh);
1523 if (error == 0) {
1524 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
1525 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1526 di->di_goal_meta = di->di_goal_data = cpu_to_be64(ip->i_goal);
1527 brelse(dibh);
1528 }
Steven Whitehouse09010972009-05-20 10:48:47 +01001529 if (rgd->rd_free < *n)
1530 goto rgrp_error;
1531
Steven Whitehousecfc8b542008-11-04 10:25:13 +00001532 rgd->rd_free -= *n;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001533
Steven Whitehoused4e9c4c2006-01-18 11:19:28 +00001534 gfs2_trans_add_bh(rgd->rd_gl, rgd->rd_bits[0].bi_bh, 1);
Bob Peterson42d52e32008-01-28 18:38:07 -06001535 gfs2_rgrp_out(rgd, rgd->rd_bits[0].bi_bh->b_data);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001536
Steven Whitehouseb45e41d2008-02-06 10:11:15 +00001537 al->al_alloced += *n;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001538
Andrew Pricead99f772008-05-01 11:55:38 +01001539 gfs2_statfs_change(sdp, 0, -(s64)*n, 0);
Steven Whitehouseb45e41d2008-02-06 10:11:15 +00001540 gfs2_quota_change(ip, *n, ip->i_inode.i_uid, ip->i_inode.i_gid);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001541
1542 spin_lock(&sdp->sd_rindex_spin);
Steven Whitehouseb45e41d2008-02-06 10:11:15 +00001543 rgd->rd_free_clone -= *n;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001544 spin_unlock(&sdp->sd_rindex_spin);
Steven Whitehouse63997772009-06-12 08:49:20 +01001545 trace_gfs2_block_alloc(ip, block, *n, GFS2_BLKST_USED);
Steven Whitehouse09010972009-05-20 10:48:47 +01001546 *bn = block;
1547 return 0;
1548
1549rgrp_error:
Steven Whitehouse6050b9c2009-07-31 16:19:40 +01001550 gfs2_rgrp_error(rgd);
Steven Whitehouse09010972009-05-20 10:48:47 +01001551 return -EIO;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001552}
1553
1554/**
1555 * gfs2_alloc_di - Allocate a dinode
1556 * @dip: the directory that the inode is going in
Steven Whitehouse6050b9c2009-07-31 16:19:40 +01001557 * @bn: the block number which is allocated
1558 * @generation: the generation number of the inode
David Teiglandb3b94fa2006-01-16 16:50:04 +00001559 *
Steven Whitehouse6050b9c2009-07-31 16:19:40 +01001560 * Returns: 0 on success or error
David Teiglandb3b94fa2006-01-16 16:50:04 +00001561 */
1562
Steven Whitehouse6050b9c2009-07-31 16:19:40 +01001563int gfs2_alloc_di(struct gfs2_inode *dip, u64 *bn, u64 *generation)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001564{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001565 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
Steven Whitehouse6dbd8222008-01-10 15:18:55 +00001566 struct gfs2_alloc *al = dip->i_alloc;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001567 struct gfs2_rgrpd *rgd = al->al_rgd;
Steven Whitehouse4340fe62006-07-11 09:46:33 -04001568 u32 blk;
1569 u64 block;
Steven Whitehouseb45e41d2008-02-06 10:11:15 +00001570 unsigned int n = 1;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001571
Steven Whitehouseac576cc2008-02-01 10:34:15 +00001572 blk = rgblk_search(rgd, rgd->rd_last_alloc,
Steven Whitehouseb45e41d2008-02-06 10:11:15 +00001573 GFS2_BLKST_FREE, GFS2_BLKST_DINODE, &n);
Steven Whitehouse6050b9c2009-07-31 16:19:40 +01001574
1575 /* Since all blocks are reserved in advance, this shouldn't happen */
1576 if (blk == BFITNOENT)
1577 goto rgrp_error;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001578
Steven Whitehouseac576cc2008-02-01 10:34:15 +00001579 rgd->rd_last_alloc = blk;
Steven Whitehousebb8d8a62007-06-01 14:11:58 +01001580 block = rgd->rd_data0 + blk;
Steven Whitehouse05164e52009-08-17 11:06:43 +01001581 if (rgd->rd_free == 0)
1582 goto rgrp_error;
1583
Steven Whitehousecfc8b542008-11-04 10:25:13 +00001584 rgd->rd_free--;
Steven Whitehouse73f74942008-11-04 10:32:57 +00001585 rgd->rd_dinodes++;
Steven Whitehoused8b71f72008-11-04 10:19:03 +00001586 *generation = rgd->rd_igeneration++;
Steven Whitehouse8d8291a2009-08-27 15:51:07 +01001587 if (*generation == 0)
1588 *generation = rgd->rd_igeneration++;
Steven Whitehoused4e9c4c2006-01-18 11:19:28 +00001589 gfs2_trans_add_bh(rgd->rd_gl, rgd->rd_bits[0].bi_bh, 1);
Bob Peterson42d52e32008-01-28 18:38:07 -06001590 gfs2_rgrp_out(rgd, rgd->rd_bits[0].bi_bh->b_data);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001591
1592 al->al_alloced++;
1593
1594 gfs2_statfs_change(sdp, 0, -1, +1);
Steven Whitehouse5731be52008-02-01 13:16:55 +00001595 gfs2_trans_add_unrevoke(sdp, block, 1);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001596
1597 spin_lock(&sdp->sd_rindex_spin);
1598 rgd->rd_free_clone--;
1599 spin_unlock(&sdp->sd_rindex_spin);
Steven Whitehouse63997772009-06-12 08:49:20 +01001600 trace_gfs2_block_alloc(dip, block, 1, GFS2_BLKST_DINODE);
Steven Whitehouse6050b9c2009-07-31 16:19:40 +01001601 *bn = block;
1602 return 0;
1603
1604rgrp_error:
1605 gfs2_rgrp_error(rgd);
1606 return -EIO;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001607}
1608
1609/**
Eric Sandeen46fcb2e2011-06-23 10:39:34 -05001610 * __gfs2_free_blocks - free a contiguous run of block(s)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001611 * @ip: the inode these blocks are being freed from
1612 * @bstart: first block of a run of contiguous blocks
1613 * @blen: the length of the block run
Eric Sandeen46fcb2e2011-06-23 10:39:34 -05001614 * @meta: 1 if the blocks represent metadata
David Teiglandb3b94fa2006-01-16 16:50:04 +00001615 *
1616 */
1617
Eric Sandeen46fcb2e2011-06-23 10:39:34 -05001618void __gfs2_free_blocks(struct gfs2_inode *ip, u64 bstart, u32 blen, int meta)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001619{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001620 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001621 struct gfs2_rgrpd *rgd;
1622
1623 rgd = rgblk_free(sdp, bstart, blen, GFS2_BLKST_FREE);
1624 if (!rgd)
1625 return;
Steven Whitehouse63997772009-06-12 08:49:20 +01001626 trace_gfs2_block_alloc(ip, bstart, blen, GFS2_BLKST_FREE);
Steven Whitehousecfc8b542008-11-04 10:25:13 +00001627 rgd->rd_free += blen;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001628
Steven Whitehoused4e9c4c2006-01-18 11:19:28 +00001629 gfs2_trans_add_bh(rgd->rd_gl, rgd->rd_bits[0].bi_bh, 1);
Bob Peterson42d52e32008-01-28 18:38:07 -06001630 gfs2_rgrp_out(rgd, rgd->rd_bits[0].bi_bh->b_data);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001631
1632 gfs2_trans_add_rg(rgd);
Steven Whitehouse6d3117b2011-05-21 14:05:58 +01001633
1634 /* Directories keep their data in the metadata address space */
Eric Sandeen46fcb2e2011-06-23 10:39:34 -05001635 if (meta || ip->i_depth)
Steven Whitehouse6d3117b2011-05-21 14:05:58 +01001636 gfs2_meta_wipe(ip, bstart, blen);
Bob Peterson4c16c362011-02-23 16:11:33 -05001637}
David Teiglandb3b94fa2006-01-16 16:50:04 +00001638
Bob Peterson4c16c362011-02-23 16:11:33 -05001639/**
Bob Peterson4c16c362011-02-23 16:11:33 -05001640 * gfs2_free_meta - free a contiguous run of data block(s)
1641 * @ip: the inode these blocks are being freed from
1642 * @bstart: first block of a run of contiguous blocks
1643 * @blen: the length of the block run
1644 *
1645 */
1646
Steven Whitehousecd915492006-09-04 12:49:07 -04001647void gfs2_free_meta(struct gfs2_inode *ip, u64 bstart, u32 blen)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001648{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001649 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001650
Eric Sandeen46fcb2e2011-06-23 10:39:34 -05001651 __gfs2_free_blocks(ip, bstart, blen, 1);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001652 gfs2_statfs_change(sdp, 0, +blen, 0);
Steven Whitehouse2933f922006-11-01 13:23:29 -05001653 gfs2_quota_change(ip, -(s64)blen, ip->i_inode.i_uid, ip->i_inode.i_gid);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001654}
1655
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001656void gfs2_unlink_di(struct inode *inode)
1657{
1658 struct gfs2_inode *ip = GFS2_I(inode);
1659 struct gfs2_sbd *sdp = GFS2_SB(inode);
1660 struct gfs2_rgrpd *rgd;
Steven Whitehousedbb7cae2007-05-15 15:37:50 +01001661 u64 blkno = ip->i_no_addr;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001662
1663 rgd = rgblk_free(sdp, blkno, 1, GFS2_BLKST_UNLINKED);
1664 if (!rgd)
1665 return;
Steven Whitehouse63997772009-06-12 08:49:20 +01001666 trace_gfs2_block_alloc(ip, blkno, 1, GFS2_BLKST_UNLINKED);
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001667 gfs2_trans_add_bh(rgd->rd_gl, rgd->rd_bits[0].bi_bh, 1);
Bob Peterson42d52e32008-01-28 18:38:07 -06001668 gfs2_rgrp_out(rgd, rgd->rd_bits[0].bi_bh->b_data);
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001669 gfs2_trans_add_rg(rgd);
1670}
1671
Steven Whitehousecd915492006-09-04 12:49:07 -04001672static void gfs2_free_uninit_di(struct gfs2_rgrpd *rgd, u64 blkno)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001673{
1674 struct gfs2_sbd *sdp = rgd->rd_sbd;
1675 struct gfs2_rgrpd *tmp_rgd;
1676
1677 tmp_rgd = rgblk_free(sdp, blkno, 1, GFS2_BLKST_FREE);
1678 if (!tmp_rgd)
1679 return;
1680 gfs2_assert_withdraw(sdp, rgd == tmp_rgd);
1681
Steven Whitehouse73f74942008-11-04 10:32:57 +00001682 if (!rgd->rd_dinodes)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001683 gfs2_consist_rgrpd(rgd);
Steven Whitehouse73f74942008-11-04 10:32:57 +00001684 rgd->rd_dinodes--;
Steven Whitehousecfc8b542008-11-04 10:25:13 +00001685 rgd->rd_free++;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001686
Steven Whitehoused4e9c4c2006-01-18 11:19:28 +00001687 gfs2_trans_add_bh(rgd->rd_gl, rgd->rd_bits[0].bi_bh, 1);
Bob Peterson42d52e32008-01-28 18:38:07 -06001688 gfs2_rgrp_out(rgd, rgd->rd_bits[0].bi_bh->b_data);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001689
1690 gfs2_statfs_change(sdp, 0, +1, -1);
1691 gfs2_trans_add_rg(rgd);
1692}
1693
David Teiglandb3b94fa2006-01-16 16:50:04 +00001694
1695void gfs2_free_di(struct gfs2_rgrpd *rgd, struct gfs2_inode *ip)
1696{
Steven Whitehousedbb7cae2007-05-15 15:37:50 +01001697 gfs2_free_uninit_di(rgd, ip->i_no_addr);
Steven Whitehouse63997772009-06-12 08:49:20 +01001698 trace_gfs2_block_alloc(ip, ip->i_no_addr, 1, GFS2_BLKST_FREE);
Steven Whitehouse2933f922006-11-01 13:23:29 -05001699 gfs2_quota_change(ip, -1, ip->i_inode.i_uid, ip->i_inode.i_gid);
Steven Whitehousedbb7cae2007-05-15 15:37:50 +01001700 gfs2_meta_wipe(ip, ip->i_no_addr, 1);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001701}
1702
1703/**
Steven Whitehouseacf7e242009-09-08 18:00:30 +01001704 * gfs2_check_blk_type - Check the type of a block
1705 * @sdp: The superblock
1706 * @no_addr: The block number to check
1707 * @type: The block type we are looking for
1708 *
1709 * Returns: 0 if the block type matches the expected type
1710 * -ESTALE if it doesn't match
1711 * or -ve errno if something went wrong while checking
1712 */
1713
1714int gfs2_check_blk_type(struct gfs2_sbd *sdp, u64 no_addr, unsigned int type)
1715{
1716 struct gfs2_rgrpd *rgd;
1717 struct gfs2_holder ri_gh, rgd_gh;
Steven Whitehouse2c776342009-11-06 11:10:51 +00001718 struct gfs2_inode *ip = GFS2_I(sdp->sd_rindex);
1719 int ri_locked = 0;
Steven Whitehouseacf7e242009-09-08 18:00:30 +01001720 int error;
1721
Steven Whitehouse2c776342009-11-06 11:10:51 +00001722 if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
1723 error = gfs2_rindex_hold(sdp, &ri_gh);
1724 if (error)
1725 goto fail;
1726 ri_locked = 1;
1727 }
Steven Whitehouseacf7e242009-09-08 18:00:30 +01001728
1729 error = -EINVAL;
1730 rgd = gfs2_blk2rgrpd(sdp, no_addr);
1731 if (!rgd)
1732 goto fail_rindex;
1733
1734 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_SHARED, 0, &rgd_gh);
1735 if (error)
1736 goto fail_rindex;
1737
1738 if (gfs2_get_block_type(rgd, no_addr) != type)
1739 error = -ESTALE;
1740
1741 gfs2_glock_dq_uninit(&rgd_gh);
1742fail_rindex:
Steven Whitehouse2c776342009-11-06 11:10:51 +00001743 if (ri_locked)
1744 gfs2_glock_dq_uninit(&ri_gh);
Steven Whitehouseacf7e242009-09-08 18:00:30 +01001745fail:
1746 return error;
1747}
1748
1749/**
David Teiglandb3b94fa2006-01-16 16:50:04 +00001750 * gfs2_rlist_add - add a RG to a list of RGs
1751 * @sdp: the filesystem
1752 * @rlist: the list of resource groups
1753 * @block: the block
1754 *
1755 * Figure out what RG a block belongs to and add that RG to the list
1756 *
1757 * FIXME: Don't use NOFAIL
1758 *
1759 */
1760
1761void gfs2_rlist_add(struct gfs2_sbd *sdp, struct gfs2_rgrp_list *rlist,
Steven Whitehousecd915492006-09-04 12:49:07 -04001762 u64 block)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001763{
1764 struct gfs2_rgrpd *rgd;
1765 struct gfs2_rgrpd **tmp;
1766 unsigned int new_space;
1767 unsigned int x;
1768
1769 if (gfs2_assert_warn(sdp, !rlist->rl_ghs))
1770 return;
1771
1772 rgd = gfs2_blk2rgrpd(sdp, block);
1773 if (!rgd) {
1774 if (gfs2_consist(sdp))
Steven Whitehouse382066d2006-05-24 10:22:09 -04001775 fs_err(sdp, "block = %llu\n", (unsigned long long)block);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001776 return;
1777 }
1778
1779 for (x = 0; x < rlist->rl_rgrps; x++)
1780 if (rlist->rl_rgd[x] == rgd)
1781 return;
1782
1783 if (rlist->rl_rgrps == rlist->rl_space) {
1784 new_space = rlist->rl_space + 10;
1785
1786 tmp = kcalloc(new_space, sizeof(struct gfs2_rgrpd *),
Steven Whitehousedd894be2006-07-27 14:29:00 -04001787 GFP_NOFS | __GFP_NOFAIL);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001788
1789 if (rlist->rl_rgd) {
1790 memcpy(tmp, rlist->rl_rgd,
1791 rlist->rl_space * sizeof(struct gfs2_rgrpd *));
1792 kfree(rlist->rl_rgd);
1793 }
1794
1795 rlist->rl_space = new_space;
1796 rlist->rl_rgd = tmp;
1797 }
1798
1799 rlist->rl_rgd[rlist->rl_rgrps++] = rgd;
1800}
1801
1802/**
1803 * gfs2_rlist_alloc - all RGs have been added to the rlist, now allocate
1804 * and initialize an array of glock holders for them
1805 * @rlist: the list of resource groups
1806 * @state: the lock state to acquire the RG lock in
1807 * @flags: the modifier flags for the holder structures
1808 *
1809 * FIXME: Don't use NOFAIL
1810 *
1811 */
1812
Bob Petersonfe6c9912008-01-28 11:13:02 -06001813void gfs2_rlist_alloc(struct gfs2_rgrp_list *rlist, unsigned int state)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001814{
1815 unsigned int x;
1816
1817 rlist->rl_ghs = kcalloc(rlist->rl_rgrps, sizeof(struct gfs2_holder),
Steven Whitehousedd894be2006-07-27 14:29:00 -04001818 GFP_NOFS | __GFP_NOFAIL);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001819 for (x = 0; x < rlist->rl_rgrps; x++)
1820 gfs2_holder_init(rlist->rl_rgd[x]->rd_gl,
Bob Petersonfe6c9912008-01-28 11:13:02 -06001821 state, 0,
David Teiglandb3b94fa2006-01-16 16:50:04 +00001822 &rlist->rl_ghs[x]);
1823}
1824
1825/**
1826 * gfs2_rlist_free - free a resource group list
1827 * @list: the list of resource groups
1828 *
1829 */
1830
1831void gfs2_rlist_free(struct gfs2_rgrp_list *rlist)
1832{
1833 unsigned int x;
1834
1835 kfree(rlist->rl_rgd);
1836
1837 if (rlist->rl_ghs) {
1838 for (x = 0; x < rlist->rl_rgrps; x++)
1839 gfs2_holder_uninit(&rlist->rl_ghs[x]);
1840 kfree(rlist->rl_ghs);
1841 }
1842}
1843