blob: cf930cd9664af9ca0c351e08c0d852f52c52417d [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,
81 unsigned int buflen, u32 block,
82 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;
85 const unsigned int bit = (block % GFS2_NBBY) * GFS2_BIT_SIZE;
Steven Whitehouse88c8ab1f2006-05-18 13:52:39 -040086
Steven Whitehouseb45e41d2008-02-06 10:11:15 +000087 byte1 = buf1 + offset + (block / GFS2_NBBY);
88 end = buf1 + offset + buflen;
Steven Whitehouse88c8ab1f2006-05-18 13:52:39 -040089
Steven Whitehouseb45e41d2008-02-06 10:11:15 +000090 BUG_ON(byte1 >= end);
Steven Whitehouse88c8ab1f2006-05-18 13:52:39 -040091
Steven Whitehouseb45e41d2008-02-06 10:11:15 +000092 cur_state = (*byte1 >> bit) & GFS2_BIT_MASK;
Steven Whitehouse88c8ab1f2006-05-18 13:52:39 -040093
Steven Whitehouseb45e41d2008-02-06 10:11:15 +000094 if (unlikely(!valid_change[new_state * 4 + cur_state])) {
Steven Whitehouse88c8ab1f2006-05-18 13:52:39 -040095 gfs2_consist_rgrpd(rgd);
Steven Whitehouseb45e41d2008-02-06 10:11:15 +000096 return;
97 }
98 *byte1 ^= (cur_state ^ new_state) << bit;
99
100 if (buf2) {
101 byte2 = buf2 + offset + (block / GFS2_NBBY);
102 cur_state = (*byte2 >> bit) & GFS2_BIT_MASK;
103 *byte2 ^= (cur_state ^ new_state) << bit;
104 }
Steven Whitehouse88c8ab1f2006-05-18 13:52:39 -0400105}
106
107/**
108 * gfs2_testbit - test a bit in the bitmaps
109 * @buffer: the buffer that holds the bitmaps
110 * @buflen: the length (in bytes) of the buffer
111 * @block: the block to read
112 *
113 */
114
Steven Whitehouseb45e41d2008-02-06 10:11:15 +0000115static inline unsigned char gfs2_testbit(struct gfs2_rgrpd *rgd,
116 const unsigned char *buffer,
117 unsigned int buflen, u32 block)
Steven Whitehouse88c8ab1f2006-05-18 13:52:39 -0400118{
Steven Whitehouseb45e41d2008-02-06 10:11:15 +0000119 const unsigned char *byte, *end;
120 unsigned char cur_state;
Steven Whitehouse88c8ab1f2006-05-18 13:52:39 -0400121 unsigned int bit;
122
123 byte = buffer + (block / GFS2_NBBY);
124 bit = (block % GFS2_NBBY) * GFS2_BIT_SIZE;
125 end = buffer + buflen;
126
127 gfs2_assert(rgd->rd_sbd, byte < end);
128
129 cur_state = (*byte >> bit) & GFS2_BIT_MASK;
130
131 return cur_state;
132}
133
134/**
Steven Whitehouse223b2b82009-02-17 14:13:35 +0000135 * gfs2_bit_search
136 * @ptr: Pointer to bitmap data
137 * @mask: Mask to use (normally 0x55555.... but adjusted for search start)
138 * @state: The state we are searching for
139 *
140 * We xor the bitmap data with a patter which is the bitwise opposite
141 * of what we are looking for, this gives rise to a pattern of ones
142 * wherever there is a match. Since we have two bits per entry, we
143 * take this pattern, shift it down by one place and then and it with
144 * the original. All the even bit positions (0,2,4, etc) then represent
145 * successful matches, so we mask with 0x55555..... to remove the unwanted
146 * odd bit positions.
147 *
148 * This allows searching of a whole u64 at once (32 blocks) with a
149 * single test (on 64 bit arches).
150 */
151
152static inline u64 gfs2_bit_search(const __le64 *ptr, u64 mask, u8 state)
153{
154 u64 tmp;
155 static const u64 search[] = {
Hannes Eder075ac442009-02-21 02:11:42 +0100156 [0] = 0xffffffffffffffffULL,
157 [1] = 0xaaaaaaaaaaaaaaaaULL,
158 [2] = 0x5555555555555555ULL,
159 [3] = 0x0000000000000000ULL,
Steven Whitehouse223b2b82009-02-17 14:13:35 +0000160 };
161 tmp = le64_to_cpu(*ptr) ^ search[state];
162 tmp &= (tmp >> 1);
163 tmp &= mask;
164 return tmp;
165}
166
167/**
Steven Whitehouse88c8ab1f2006-05-18 13:52:39 -0400168 * gfs2_bitfit - Search an rgrp's bitmap buffer to find a bit-pair representing
169 * a block in a given allocation state.
170 * @buffer: the buffer that holds the bitmaps
Steven Whitehouse223b2b82009-02-17 14:13:35 +0000171 * @len: the length (in bytes) of the buffer
Steven Whitehouse88c8ab1f2006-05-18 13:52:39 -0400172 * @goal: start search at this block's bit-pair (within @buffer)
Steven Whitehouse223b2b82009-02-17 14:13:35 +0000173 * @state: GFS2_BLKST_XXX the state of the block we're looking for.
Steven Whitehouse88c8ab1f2006-05-18 13:52:39 -0400174 *
175 * Scope of @goal and returned block number is only within this bitmap buffer,
176 * not entire rgrp or filesystem. @buffer will be offset from the actual
Steven Whitehouse223b2b82009-02-17 14:13:35 +0000177 * beginning of a bitmap block buffer, skipping any header structures, but
178 * headers are always a multiple of 64 bits long so that the buffer is
179 * always aligned to a 64 bit boundary.
180 *
181 * The size of the buffer is in bytes, but is it assumed that it is
Anand Gadiyarfd589a82009-07-16 17:13:03 +0200182 * always ok to read a complete multiple of 64 bits at the end
Steven Whitehouse223b2b82009-02-17 14:13:35 +0000183 * of the block in case the end is no aligned to a natural boundary.
Steven Whitehouse88c8ab1f2006-05-18 13:52:39 -0400184 *
185 * Return: the block number (bitmap buffer scope) that was found
186 */
187
Hannes Eder02ab1722009-02-21 02:12:05 +0100188static u32 gfs2_bitfit(const u8 *buf, const unsigned int len,
189 u32 goal, u8 state)
Steven Whitehouse88c8ab1f2006-05-18 13:52:39 -0400190{
Steven Whitehouse223b2b82009-02-17 14:13:35 +0000191 u32 spoint = (goal << 1) & ((8*sizeof(u64)) - 1);
192 const __le64 *ptr = ((__le64 *)buf) + (goal >> 5);
193 const __le64 *end = (__le64 *)(buf + ALIGN(len, sizeof(u64)));
194 u64 tmp;
Hannes Eder075ac442009-02-21 02:11:42 +0100195 u64 mask = 0x5555555555555555ULL;
Steven Whitehouse223b2b82009-02-17 14:13:35 +0000196 u32 bit;
Steven Whitehouse88c8ab1f2006-05-18 13:52:39 -0400197
Steven Whitehouse223b2b82009-02-17 14:13:35 +0000198 BUG_ON(state > 3);
Steven Whitehouse88c8ab1f2006-05-18 13:52:39 -0400199
Steven Whitehouse223b2b82009-02-17 14:13:35 +0000200 /* Mask off bits we don't care about at the start of the search */
201 mask <<= spoint;
202 tmp = gfs2_bit_search(ptr, mask, state);
203 ptr++;
204 while(tmp == 0 && ptr < end) {
Hannes Eder075ac442009-02-21 02:11:42 +0100205 tmp = gfs2_bit_search(ptr, 0x5555555555555555ULL, state);
Steven Whitehouse223b2b82009-02-17 14:13:35 +0000206 ptr++;
Bob Peterson1f466a42008-03-10 18:17:47 -0500207 }
Steven Whitehouse223b2b82009-02-17 14:13:35 +0000208 /* Mask off any bits which are more than len bytes from the start */
209 if (ptr == end && (len & (sizeof(u64) - 1)))
210 tmp &= (((u64)~0) >> (64 - 8*(len & (sizeof(u64) - 1))));
211 /* Didn't find anything, so return */
212 if (tmp == 0)
213 return BFITNOENT;
214 ptr--;
Steven Whitehoused8bd5042009-04-23 08:54:02 +0100215 bit = __ffs64(tmp);
Steven Whitehouse223b2b82009-02-17 14:13:35 +0000216 bit /= 2; /* two bits per entry in the bitmap */
217 return (((const unsigned char *)ptr - buf) * GFS2_NBBY) + bit;
Steven Whitehouse88c8ab1f2006-05-18 13:52:39 -0400218}
219
220/**
221 * gfs2_bitcount - count the number of bits in a certain state
222 * @buffer: the buffer that holds the bitmaps
223 * @buflen: the length (in bytes) of the buffer
224 * @state: the state of the block we're looking for
225 *
226 * Returns: The number of bits
227 */
228
Steven Whitehouse110acf32008-01-29 13:30:20 +0000229static u32 gfs2_bitcount(struct gfs2_rgrpd *rgd, const u8 *buffer,
230 unsigned int buflen, u8 state)
Steven Whitehouse88c8ab1f2006-05-18 13:52:39 -0400231{
Steven Whitehouse110acf32008-01-29 13:30:20 +0000232 const u8 *byte = buffer;
233 const u8 *end = buffer + buflen;
234 const u8 state1 = state << 2;
235 const u8 state2 = state << 4;
236 const u8 state3 = state << 6;
Steven Whitehousecd915492006-09-04 12:49:07 -0400237 u32 count = 0;
Steven Whitehouse88c8ab1f2006-05-18 13:52:39 -0400238
239 for (; byte < end; byte++) {
240 if (((*byte) & 0x03) == state)
241 count++;
242 if (((*byte) & 0x0C) == state1)
243 count++;
244 if (((*byte) & 0x30) == state2)
245 count++;
246 if (((*byte) & 0xC0) == state3)
247 count++;
248 }
249
250 return count;
251}
252
David Teiglandb3b94fa2006-01-16 16:50:04 +0000253/**
254 * gfs2_rgrp_verify - Verify that a resource group is consistent
255 * @sdp: the filesystem
256 * @rgd: the rgrp
257 *
258 */
259
260void gfs2_rgrp_verify(struct gfs2_rgrpd *rgd)
261{
262 struct gfs2_sbd *sdp = rgd->rd_sbd;
263 struct gfs2_bitmap *bi = NULL;
Steven Whitehousebb8d8a62007-06-01 14:11:58 +0100264 u32 length = rgd->rd_length;
Steven Whitehousecd915492006-09-04 12:49:07 -0400265 u32 count[4], tmp;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000266 int buf, x;
267
Steven Whitehousecd915492006-09-04 12:49:07 -0400268 memset(count, 0, 4 * sizeof(u32));
David Teiglandb3b94fa2006-01-16 16:50:04 +0000269
270 /* Count # blocks in each of 4 possible allocation states */
271 for (buf = 0; buf < length; buf++) {
272 bi = rgd->rd_bits + buf;
273 for (x = 0; x < 4; x++)
274 count[x] += gfs2_bitcount(rgd,
275 bi->bi_bh->b_data +
276 bi->bi_offset,
277 bi->bi_len, x);
278 }
279
Steven Whitehousecfc8b542008-11-04 10:25:13 +0000280 if (count[0] != rgd->rd_free) {
David Teiglandb3b94fa2006-01-16 16:50:04 +0000281 if (gfs2_consist_rgrpd(rgd))
282 fs_err(sdp, "free data mismatch: %u != %u\n",
Steven Whitehousecfc8b542008-11-04 10:25:13 +0000283 count[0], rgd->rd_free);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000284 return;
285 }
286
Steven Whitehouse73f74942008-11-04 10:32:57 +0000287 tmp = rgd->rd_data - rgd->rd_free - rgd->rd_dinodes;
Benjamin Marzinski6b946172009-07-10 18:13:26 -0500288 if (count[1] != tmp) {
David Teiglandb3b94fa2006-01-16 16:50:04 +0000289 if (gfs2_consist_rgrpd(rgd))
290 fs_err(sdp, "used data mismatch: %u != %u\n",
291 count[1], tmp);
292 return;
293 }
294
Benjamin Marzinski6b946172009-07-10 18:13:26 -0500295 if (count[2] + count[3] != rgd->rd_dinodes) {
David Teiglandb3b94fa2006-01-16 16:50:04 +0000296 if (gfs2_consist_rgrpd(rgd))
297 fs_err(sdp, "used metadata mismatch: %u != %u\n",
Benjamin Marzinski6b946172009-07-10 18:13:26 -0500298 count[2] + count[3], rgd->rd_dinodes);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000299 return;
300 }
301}
302
Steven Whitehousebb8d8a62007-06-01 14:11:58 +0100303static inline int rgrp_contains_block(struct gfs2_rgrpd *rgd, u64 block)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000304{
Steven Whitehousebb8d8a62007-06-01 14:11:58 +0100305 u64 first = rgd->rd_data0;
306 u64 last = first + rgd->rd_data;
Steven Whitehouse16910422006-09-05 11:15:45 -0400307 return first <= block && block < last;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000308}
309
310/**
311 * gfs2_blk2rgrpd - Find resource group for a given data/meta block number
312 * @sdp: The GFS2 superblock
313 * @n: The data block number
314 *
315 * Returns: The resource group, or NULL if not found
316 */
317
Steven Whitehousecd915492006-09-04 12:49:07 -0400318struct gfs2_rgrpd *gfs2_blk2rgrpd(struct gfs2_sbd *sdp, u64 blk)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000319{
320 struct gfs2_rgrpd *rgd;
321
322 spin_lock(&sdp->sd_rindex_spin);
323
324 list_for_each_entry(rgd, &sdp->sd_rindex_mru_list, rd_list_mru) {
Steven Whitehousebb8d8a62007-06-01 14:11:58 +0100325 if (rgrp_contains_block(rgd, blk)) {
David Teiglandb3b94fa2006-01-16 16:50:04 +0000326 list_move(&rgd->rd_list_mru, &sdp->sd_rindex_mru_list);
327 spin_unlock(&sdp->sd_rindex_spin);
328 return rgd;
329 }
330 }
331
332 spin_unlock(&sdp->sd_rindex_spin);
333
334 return NULL;
335}
336
337/**
338 * gfs2_rgrpd_get_first - get the first Resource Group in the filesystem
339 * @sdp: The GFS2 superblock
340 *
341 * Returns: The first rgrp in the filesystem
342 */
343
344struct gfs2_rgrpd *gfs2_rgrpd_get_first(struct gfs2_sbd *sdp)
345{
346 gfs2_assert(sdp, !list_empty(&sdp->sd_rindex_list));
347 return list_entry(sdp->sd_rindex_list.next, struct gfs2_rgrpd, rd_list);
348}
349
350/**
351 * gfs2_rgrpd_get_next - get the next RG
352 * @rgd: A RG
353 *
354 * Returns: The next rgrp
355 */
356
357struct gfs2_rgrpd *gfs2_rgrpd_get_next(struct gfs2_rgrpd *rgd)
358{
359 if (rgd->rd_list.next == &rgd->rd_sbd->sd_rindex_list)
360 return NULL;
361 return list_entry(rgd->rd_list.next, struct gfs2_rgrpd, rd_list);
362}
363
364static void clear_rgrpdi(struct gfs2_sbd *sdp)
365{
366 struct list_head *head;
367 struct gfs2_rgrpd *rgd;
368 struct gfs2_glock *gl;
369
370 spin_lock(&sdp->sd_rindex_spin);
371 sdp->sd_rindex_forward = NULL;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000372 spin_unlock(&sdp->sd_rindex_spin);
373
374 head = &sdp->sd_rindex_list;
375 while (!list_empty(head)) {
376 rgd = list_entry(head->next, struct gfs2_rgrpd, rd_list);
377 gl = rgd->rd_gl;
378
379 list_del(&rgd->rd_list);
380 list_del(&rgd->rd_list_mru);
381
382 if (gl) {
Steven Whitehouse5c676f62006-02-27 17:23:27 -0500383 gl->gl_object = NULL;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000384 gfs2_glock_put(gl);
385 }
386
387 kfree(rgd->rd_bits);
Bob Peterson6bdd9be2008-01-28 17:20:26 -0600388 kmem_cache_free(gfs2_rgrpd_cachep, rgd);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000389 }
390}
391
392void gfs2_clear_rgrpd(struct gfs2_sbd *sdp)
393{
Steven Whitehousef55ab262006-02-21 12:51:39 +0000394 mutex_lock(&sdp->sd_rindex_mutex);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000395 clear_rgrpdi(sdp);
Steven Whitehousef55ab262006-02-21 12:51:39 +0000396 mutex_unlock(&sdp->sd_rindex_mutex);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000397}
398
Steven Whitehousebb8d8a62007-06-01 14:11:58 +0100399static void gfs2_rindex_print(const struct gfs2_rgrpd *rgd)
400{
401 printk(KERN_INFO " ri_addr = %llu\n", (unsigned long long)rgd->rd_addr);
402 printk(KERN_INFO " ri_length = %u\n", rgd->rd_length);
403 printk(KERN_INFO " ri_data0 = %llu\n", (unsigned long long)rgd->rd_data0);
404 printk(KERN_INFO " ri_data = %u\n", rgd->rd_data);
405 printk(KERN_INFO " ri_bitbytes = %u\n", rgd->rd_bitbytes);
406}
407
David Teiglandb3b94fa2006-01-16 16:50:04 +0000408/**
409 * gfs2_compute_bitstructs - Compute the bitmap sizes
410 * @rgd: The resource group descriptor
411 *
412 * Calculates bitmap descriptors, one for each block that contains bitmap data
413 *
414 * Returns: errno
415 */
416
417static int compute_bitstructs(struct gfs2_rgrpd *rgd)
418{
419 struct gfs2_sbd *sdp = rgd->rd_sbd;
420 struct gfs2_bitmap *bi;
Steven Whitehousebb8d8a62007-06-01 14:11:58 +0100421 u32 length = rgd->rd_length; /* # blocks in hdr & bitmap */
Steven Whitehousecd915492006-09-04 12:49:07 -0400422 u32 bytes_left, bytes;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000423 int x;
424
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400425 if (!length)
426 return -EINVAL;
427
Steven Whitehousedd894be2006-07-27 14:29:00 -0400428 rgd->rd_bits = kcalloc(length, sizeof(struct gfs2_bitmap), GFP_NOFS);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000429 if (!rgd->rd_bits)
430 return -ENOMEM;
431
Steven Whitehousebb8d8a62007-06-01 14:11:58 +0100432 bytes_left = rgd->rd_bitbytes;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000433
434 for (x = 0; x < length; x++) {
435 bi = rgd->rd_bits + x;
436
Steven Whitehouse60a0b8f2009-05-21 12:23:12 +0100437 bi->bi_flags = 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000438 /* small rgrp; bitmap stored completely in header block */
439 if (length == 1) {
440 bytes = bytes_left;
441 bi->bi_offset = sizeof(struct gfs2_rgrp);
442 bi->bi_start = 0;
443 bi->bi_len = bytes;
444 /* header block */
445 } else if (x == 0) {
446 bytes = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_rgrp);
447 bi->bi_offset = sizeof(struct gfs2_rgrp);
448 bi->bi_start = 0;
449 bi->bi_len = bytes;
450 /* last block */
451 } else if (x + 1 == length) {
452 bytes = bytes_left;
453 bi->bi_offset = sizeof(struct gfs2_meta_header);
Steven Whitehousebb8d8a62007-06-01 14:11:58 +0100454 bi->bi_start = rgd->rd_bitbytes - bytes_left;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000455 bi->bi_len = bytes;
456 /* other blocks */
457 } else {
Steven Whitehouse568f4c92006-02-27 12:00:42 -0500458 bytes = sdp->sd_sb.sb_bsize -
459 sizeof(struct gfs2_meta_header);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000460 bi->bi_offset = sizeof(struct gfs2_meta_header);
Steven Whitehousebb8d8a62007-06-01 14:11:58 +0100461 bi->bi_start = rgd->rd_bitbytes - bytes_left;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000462 bi->bi_len = bytes;
463 }
464
465 bytes_left -= bytes;
466 }
467
468 if (bytes_left) {
469 gfs2_consist_rgrpd(rgd);
470 return -EIO;
471 }
472 bi = rgd->rd_bits + (length - 1);
Steven Whitehousebb8d8a62007-06-01 14:11:58 +0100473 if ((bi->bi_start + bi->bi_len) * GFS2_NBBY != rgd->rd_data) {
David Teiglandb3b94fa2006-01-16 16:50:04 +0000474 if (gfs2_consist_rgrpd(rgd)) {
Steven Whitehousebb8d8a62007-06-01 14:11:58 +0100475 gfs2_rindex_print(rgd);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000476 fs_err(sdp, "start=%u len=%u offset=%u\n",
477 bi->bi_start, bi->bi_len, bi->bi_offset);
478 }
479 return -EIO;
480 }
481
482 return 0;
483}
484
485/**
Robert Peterson7ae8fa82007-05-09 09:37:57 -0500486 * gfs2_ri_total - Total up the file system space, according to the rindex.
487 *
488 */
489u64 gfs2_ri_total(struct gfs2_sbd *sdp)
490{
491 u64 total_data = 0;
492 struct inode *inode = sdp->sd_rindex;
493 struct gfs2_inode *ip = GFS2_I(inode);
Robert Peterson7ae8fa82007-05-09 09:37:57 -0500494 char buf[sizeof(struct gfs2_rindex)];
495 struct file_ra_state ra_state;
496 int error, rgrps;
497
498 mutex_lock(&sdp->sd_rindex_mutex);
499 file_ra_state_init(&ra_state, inode->i_mapping);
500 for (rgrps = 0;; rgrps++) {
501 loff_t pos = rgrps * sizeof(struct gfs2_rindex);
502
Bob Petersonbcd72782010-12-07 13:58:56 -0500503 if (pos + sizeof(struct gfs2_rindex) > i_size_read(inode))
Robert Peterson7ae8fa82007-05-09 09:37:57 -0500504 break;
505 error = gfs2_internal_read(ip, &ra_state, buf, &pos,
506 sizeof(struct gfs2_rindex));
507 if (error != sizeof(struct gfs2_rindex))
508 break;
Steven Whitehousebb8d8a62007-06-01 14:11:58 +0100509 total_data += be32_to_cpu(((struct gfs2_rindex *)buf)->ri_data);
Robert Peterson7ae8fa82007-05-09 09:37:57 -0500510 }
511 mutex_unlock(&sdp->sd_rindex_mutex);
512 return total_data;
513}
514
Steven Whitehousebb8d8a62007-06-01 14:11:58 +0100515static void gfs2_rindex_in(struct gfs2_rgrpd *rgd, const void *buf)
516{
517 const struct gfs2_rindex *str = buf;
518
519 rgd->rd_addr = be64_to_cpu(str->ri_addr);
520 rgd->rd_length = be32_to_cpu(str->ri_length);
521 rgd->rd_data0 = be64_to_cpu(str->ri_data0);
522 rgd->rd_data = be32_to_cpu(str->ri_data);
523 rgd->rd_bitbytes = be32_to_cpu(str->ri_bitbytes);
524}
525
Robert Peterson7ae8fa82007-05-09 09:37:57 -0500526/**
Robert Peterson6c532672007-05-10 16:54:38 -0500527 * read_rindex_entry - Pull in a new resource index entry from the disk
David Teiglandb3b94fa2006-01-16 16:50:04 +0000528 * @gl: The glock covering the rindex inode
529 *
Robert Peterson6c532672007-05-10 16:54:38 -0500530 * Returns: 0 on success, error code otherwise
531 */
532
533static int read_rindex_entry(struct gfs2_inode *ip,
534 struct file_ra_state *ra_state)
535{
536 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
537 loff_t pos = sdp->sd_rgrps * sizeof(struct gfs2_rindex);
538 char buf[sizeof(struct gfs2_rindex)];
539 int error;
540 struct gfs2_rgrpd *rgd;
541
542 error = gfs2_internal_read(ip, ra_state, buf, &pos,
543 sizeof(struct gfs2_rindex));
544 if (!error)
545 return 0;
546 if (error != sizeof(struct gfs2_rindex)) {
547 if (error > 0)
548 error = -EIO;
549 return error;
550 }
551
Bob Peterson6bdd9be2008-01-28 17:20:26 -0600552 rgd = kmem_cache_zalloc(gfs2_rgrpd_cachep, GFP_NOFS);
Robert Peterson6c532672007-05-10 16:54:38 -0500553 error = -ENOMEM;
554 if (!rgd)
555 return error;
556
557 mutex_init(&rgd->rd_mutex);
558 lops_init_le(&rgd->rd_le, &gfs2_rg_lops);
559 rgd->rd_sbd = sdp;
560
561 list_add_tail(&rgd->rd_list, &sdp->sd_rindex_list);
562 list_add_tail(&rgd->rd_list_mru, &sdp->sd_rindex_mru_list);
563
Steven Whitehousebb8d8a62007-06-01 14:11:58 +0100564 gfs2_rindex_in(rgd, buf);
Robert Peterson6c532672007-05-10 16:54:38 -0500565 error = compute_bitstructs(rgd);
566 if (error)
567 return error;
568
Steven Whitehousebb8d8a62007-06-01 14:11:58 +0100569 error = gfs2_glock_get(sdp, rgd->rd_addr,
Robert Peterson6c532672007-05-10 16:54:38 -0500570 &gfs2_rgrp_glops, CREATE, &rgd->rd_gl);
571 if (error)
572 return error;
573
574 rgd->rd_gl->gl_object = rgd;
Bob Petersoncf45b752008-01-31 10:31:39 -0600575 rgd->rd_flags &= ~GFS2_RDF_UPTODATE;
Robert Peterson6c532672007-05-10 16:54:38 -0500576 return error;
577}
578
579/**
580 * gfs2_ri_update - Pull in a new resource index from the disk
581 * @ip: pointer to the rindex inode
582 *
David Teiglandb3b94fa2006-01-16 16:50:04 +0000583 * Returns: 0 on successful update, error code otherwise
584 */
585
Benjamin Marzinski086d8332010-11-23 23:52:55 -0600586int gfs2_ri_update(struct gfs2_inode *ip)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000587{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400588 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
589 struct inode *inode = &ip->i_inode;
Steven Whitehousef42faf42006-01-30 18:34:10 +0000590 struct file_ra_state ra_state;
Steven Whitehousea2e0f792010-08-11 09:53:11 +0100591 u64 rgrp_count = i_size_read(inode);
Benjamin Marzinski39211202010-08-20 00:21:02 -0500592 struct gfs2_rgrpd *rgd;
593 unsigned int max_data = 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000594 int error;
595
Steven Whitehouse7fe3ec62010-01-29 15:20:34 +0000596 do_div(rgrp_count, sizeof(struct gfs2_rindex));
David Teiglandb3b94fa2006-01-16 16:50:04 +0000597 clear_rgrpdi(sdp);
598
Steven Whitehousef42faf42006-01-30 18:34:10 +0000599 file_ra_state_init(&ra_state, inode->i_mapping);
Robert Petersoncd81a4b2007-05-14 12:42:18 -0500600 for (sdp->sd_rgrps = 0; sdp->sd_rgrps < rgrp_count; sdp->sd_rgrps++) {
Robert Peterson6c532672007-05-10 16:54:38 -0500601 error = read_rindex_entry(ip, &ra_state);
602 if (error) {
603 clear_rgrpdi(sdp);
604 return error;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000605 }
David Teiglandb3b94fa2006-01-16 16:50:04 +0000606 }
607
Benjamin Marzinski39211202010-08-20 00:21:02 -0500608 list_for_each_entry(rgd, &sdp->sd_rindex_list, rd_list)
609 if (rgd->rd_data > max_data)
610 max_data = rgd->rd_data;
611 sdp->sd_max_rg_data = max_data;
Bob Petersoncf45b752008-01-31 10:31:39 -0600612 sdp->sd_rindex_uptodate = 1;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000613 return 0;
Robert Peterson6c532672007-05-10 16:54:38 -0500614}
David Teiglandb3b94fa2006-01-16 16:50:04 +0000615
Robert Peterson6c532672007-05-10 16:54:38 -0500616/**
David Teiglandb3b94fa2006-01-16 16:50:04 +0000617 * gfs2_rindex_hold - Grab a lock on the rindex
618 * @sdp: The GFS2 superblock
619 * @ri_gh: the glock holder
620 *
621 * We grab a lock on the rindex inode to make sure that it doesn't
622 * change whilst we are performing an operation. We keep this lock
623 * for quite long periods of time compared to other locks. This
624 * doesn't matter, since it is shared and it is very, very rarely
625 * accessed in the exclusive mode (i.e. only when expanding the filesystem).
626 *
627 * This makes sure that we're using the latest copy of the resource index
628 * special file, which might have been updated if someone expanded the
629 * filesystem (via gfs2_grow utility), which adds new resource groups.
630 *
631 * Returns: 0 on success, error code otherwise
632 */
633
634int gfs2_rindex_hold(struct gfs2_sbd *sdp, struct gfs2_holder *ri_gh)
635{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400636 struct gfs2_inode *ip = GFS2_I(sdp->sd_rindex);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000637 struct gfs2_glock *gl = ip->i_gl;
638 int error;
639
640 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, 0, ri_gh);
641 if (error)
642 return error;
643
644 /* Read new copy from disk if we don't have the latest */
Bob Petersoncf45b752008-01-31 10:31:39 -0600645 if (!sdp->sd_rindex_uptodate) {
Steven Whitehousef55ab262006-02-21 12:51:39 +0000646 mutex_lock(&sdp->sd_rindex_mutex);
Bob Petersoncf45b752008-01-31 10:31:39 -0600647 if (!sdp->sd_rindex_uptodate) {
David Teiglandb3b94fa2006-01-16 16:50:04 +0000648 error = gfs2_ri_update(ip);
649 if (error)
650 gfs2_glock_dq_uninit(ri_gh);
651 }
Steven Whitehousef55ab262006-02-21 12:51:39 +0000652 mutex_unlock(&sdp->sd_rindex_mutex);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000653 }
654
655 return error;
656}
657
Bob Peterson42d52e32008-01-28 18:38:07 -0600658static void gfs2_rgrp_in(struct gfs2_rgrpd *rgd, const void *buf)
Steven Whitehousebb8d8a62007-06-01 14:11:58 +0100659{
660 const struct gfs2_rgrp *str = buf;
Bob Peterson42d52e32008-01-28 18:38:07 -0600661 u32 rg_flags;
Steven Whitehousebb8d8a62007-06-01 14:11:58 +0100662
Bob Peterson42d52e32008-01-28 18:38:07 -0600663 rg_flags = be32_to_cpu(str->rg_flags);
Steven Whitehouse09010972009-05-20 10:48:47 +0100664 rg_flags &= ~GFS2_RDF_MASK;
Steven Whitehouse1ce97e52009-05-21 15:18:19 +0100665 rgd->rd_flags &= GFS2_RDF_MASK;
666 rgd->rd_flags |= rg_flags;
Steven Whitehousecfc8b542008-11-04 10:25:13 +0000667 rgd->rd_free = be32_to_cpu(str->rg_free);
Steven Whitehouse73f74942008-11-04 10:32:57 +0000668 rgd->rd_dinodes = be32_to_cpu(str->rg_dinodes);
Steven Whitehoused8b71f72008-11-04 10:19:03 +0000669 rgd->rd_igeneration = be64_to_cpu(str->rg_igeneration);
Steven Whitehousebb8d8a62007-06-01 14:11:58 +0100670}
671
Bob Peterson42d52e32008-01-28 18:38:07 -0600672static void gfs2_rgrp_out(struct gfs2_rgrpd *rgd, void *buf)
Steven Whitehousebb8d8a62007-06-01 14:11:58 +0100673{
674 struct gfs2_rgrp *str = buf;
675
Steven Whitehouse09010972009-05-20 10:48:47 +0100676 str->rg_flags = cpu_to_be32(rgd->rd_flags & ~GFS2_RDF_MASK);
Steven Whitehousecfc8b542008-11-04 10:25:13 +0000677 str->rg_free = cpu_to_be32(rgd->rd_free);
Steven Whitehouse73f74942008-11-04 10:32:57 +0000678 str->rg_dinodes = cpu_to_be32(rgd->rd_dinodes);
Steven Whitehousebb8d8a62007-06-01 14:11:58 +0100679 str->__pad = cpu_to_be32(0);
Steven Whitehoused8b71f72008-11-04 10:19:03 +0000680 str->rg_igeneration = cpu_to_be64(rgd->rd_igeneration);
Steven Whitehousebb8d8a62007-06-01 14:11:58 +0100681 memset(&str->rg_reserved, 0, sizeof(str->rg_reserved));
682}
683
David Teiglandb3b94fa2006-01-16 16:50:04 +0000684/**
685 * gfs2_rgrp_bh_get - Read in a RG's header and bitmaps
686 * @rgd: the struct gfs2_rgrpd describing the RG to read in
687 *
688 * Read in all of a Resource Group's header and bitmap blocks.
689 * Caller must eventually call gfs2_rgrp_relse() to free the bitmaps.
690 *
691 * Returns: errno
692 */
693
694int gfs2_rgrp_bh_get(struct gfs2_rgrpd *rgd)
695{
696 struct gfs2_sbd *sdp = rgd->rd_sbd;
697 struct gfs2_glock *gl = rgd->rd_gl;
Steven Whitehousebb8d8a62007-06-01 14:11:58 +0100698 unsigned int length = rgd->rd_length;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000699 struct gfs2_bitmap *bi;
700 unsigned int x, y;
701 int error;
702
Steven Whitehousef55ab262006-02-21 12:51:39 +0000703 mutex_lock(&rgd->rd_mutex);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000704
705 spin_lock(&sdp->sd_rindex_spin);
706 if (rgd->rd_bh_count) {
707 rgd->rd_bh_count++;
708 spin_unlock(&sdp->sd_rindex_spin);
Steven Whitehousef55ab262006-02-21 12:51:39 +0000709 mutex_unlock(&rgd->rd_mutex);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000710 return 0;
711 }
712 spin_unlock(&sdp->sd_rindex_spin);
713
714 for (x = 0; x < length; x++) {
715 bi = rgd->rd_bits + x;
Steven Whitehousebb8d8a62007-06-01 14:11:58 +0100716 error = gfs2_meta_read(gl, rgd->rd_addr + x, 0, &bi->bi_bh);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000717 if (error)
718 goto fail;
719 }
720
721 for (y = length; y--;) {
722 bi = rgd->rd_bits + y;
Steven Whitehouse7276b3b2006-09-21 17:05:23 -0400723 error = gfs2_meta_wait(sdp, bi->bi_bh);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000724 if (error)
725 goto fail;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400726 if (gfs2_metatype_check(sdp, bi->bi_bh, y ? GFS2_METATYPE_RB :
David Teiglandb3b94fa2006-01-16 16:50:04 +0000727 GFS2_METATYPE_RG)) {
728 error = -EIO;
729 goto fail;
730 }
731 }
732
Bob Petersoncf45b752008-01-31 10:31:39 -0600733 if (!(rgd->rd_flags & GFS2_RDF_UPTODATE)) {
Steven Whitehouse60a0b8f2009-05-21 12:23:12 +0100734 for (x = 0; x < length; x++)
735 clear_bit(GBF_FULL, &rgd->rd_bits[x].bi_flags);
Bob Peterson42d52e32008-01-28 18:38:07 -0600736 gfs2_rgrp_in(rgd, (rgd->rd_bits[0].bi_bh)->b_data);
Steven Whitehouse1ce97e52009-05-21 15:18:19 +0100737 rgd->rd_flags |= (GFS2_RDF_UPTODATE | GFS2_RDF_CHECK);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000738 }
739
740 spin_lock(&sdp->sd_rindex_spin);
Steven Whitehousecfc8b542008-11-04 10:25:13 +0000741 rgd->rd_free_clone = rgd->rd_free;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000742 rgd->rd_bh_count++;
743 spin_unlock(&sdp->sd_rindex_spin);
744
Steven Whitehousef55ab262006-02-21 12:51:39 +0000745 mutex_unlock(&rgd->rd_mutex);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000746
747 return 0;
748
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400749fail:
David Teiglandb3b94fa2006-01-16 16:50:04 +0000750 while (x--) {
751 bi = rgd->rd_bits + x;
752 brelse(bi->bi_bh);
753 bi->bi_bh = NULL;
754 gfs2_assert_warn(sdp, !bi->bi_clone);
755 }
Steven Whitehousef55ab262006-02-21 12:51:39 +0000756 mutex_unlock(&rgd->rd_mutex);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000757
758 return error;
759}
760
761void gfs2_rgrp_bh_hold(struct gfs2_rgrpd *rgd)
762{
763 struct gfs2_sbd *sdp = rgd->rd_sbd;
764
765 spin_lock(&sdp->sd_rindex_spin);
766 gfs2_assert_warn(rgd->rd_sbd, rgd->rd_bh_count);
767 rgd->rd_bh_count++;
768 spin_unlock(&sdp->sd_rindex_spin);
769}
770
771/**
772 * gfs2_rgrp_bh_put - Release RG bitmaps read in with gfs2_rgrp_bh_get()
773 * @rgd: the struct gfs2_rgrpd describing the RG to read in
774 *
775 */
776
777void gfs2_rgrp_bh_put(struct gfs2_rgrpd *rgd)
778{
779 struct gfs2_sbd *sdp = rgd->rd_sbd;
Steven Whitehousebb8d8a62007-06-01 14:11:58 +0100780 int x, length = rgd->rd_length;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000781
782 spin_lock(&sdp->sd_rindex_spin);
783 gfs2_assert_warn(rgd->rd_sbd, rgd->rd_bh_count);
784 if (--rgd->rd_bh_count) {
785 spin_unlock(&sdp->sd_rindex_spin);
786 return;
787 }
788
789 for (x = 0; x < length; x++) {
790 struct gfs2_bitmap *bi = rgd->rd_bits + x;
791 kfree(bi->bi_clone);
792 bi->bi_clone = NULL;
793 brelse(bi->bi_bh);
794 bi->bi_bh = NULL;
795 }
796
797 spin_unlock(&sdp->sd_rindex_spin);
798}
799
Steven Whitehousef15ab562009-02-09 09:25:01 +0000800static void gfs2_rgrp_send_discards(struct gfs2_sbd *sdp, u64 offset,
801 const struct gfs2_bitmap *bi)
802{
803 struct super_block *sb = sdp->sd_vfs;
804 struct block_device *bdev = sb->s_bdev;
805 const unsigned int sects_per_blk = sdp->sd_sb.sb_bsize /
Martin K. Petersene1defc42009-05-22 17:17:49 -0400806 bdev_logical_block_size(sb->s_bdev);
Steven Whitehousef15ab562009-02-09 09:25:01 +0000807 u64 blk;
Steven Whitehouse64d576b2009-02-12 13:31:58 +0000808 sector_t start = 0;
Steven Whitehousef15ab562009-02-09 09:25:01 +0000809 sector_t nr_sects = 0;
810 int rv;
811 unsigned int x;
812
813 for (x = 0; x < bi->bi_len; x++) {
814 const u8 *orig = bi->bi_bh->b_data + bi->bi_offset + x;
815 const u8 *clone = bi->bi_clone + bi->bi_offset + x;
816 u8 diff = ~(*orig | (*orig >> 1)) & (*clone | (*clone >> 1));
817 diff &= 0x55;
818 if (diff == 0)
819 continue;
820 blk = offset + ((bi->bi_start + x) * GFS2_NBBY);
821 blk *= sects_per_blk; /* convert to sectors */
822 while(diff) {
823 if (diff & 1) {
824 if (nr_sects == 0)
825 goto start_new_extent;
826 if ((start + nr_sects) != blk) {
827 rv = blkdev_issue_discard(bdev, start,
Christoph Hellwig746cd1e2009-09-12 07:35:43 +0200828 nr_sects, GFP_NOFS,
Christoph Hellwigdd3932e2010-09-16 20:51:46 +0200829 0);
Steven Whitehousef15ab562009-02-09 09:25:01 +0000830 if (rv)
831 goto fail;
832 nr_sects = 0;
833start_new_extent:
834 start = blk;
835 }
836 nr_sects += sects_per_blk;
837 }
838 diff >>= 2;
839 blk += sects_per_blk;
840 }
841 }
842 if (nr_sects) {
Christoph Hellwigdd3932e2010-09-16 20:51:46 +0200843 rv = blkdev_issue_discard(bdev, start, nr_sects, GFP_NOFS, 0);
Steven Whitehousef15ab562009-02-09 09:25:01 +0000844 if (rv)
845 goto fail;
846 }
847 return;
848fail:
849 fs_warn(sdp, "error %d on discard request, turning discards off for this filesystem", rv);
850 sdp->sd_args.ar_discard = 0;
851}
852
David Teiglandb3b94fa2006-01-16 16:50:04 +0000853void gfs2_rgrp_repolish_clones(struct gfs2_rgrpd *rgd)
854{
855 struct gfs2_sbd *sdp = rgd->rd_sbd;
Steven Whitehousebb8d8a62007-06-01 14:11:58 +0100856 unsigned int length = rgd->rd_length;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000857 unsigned int x;
858
859 for (x = 0; x < length; x++) {
860 struct gfs2_bitmap *bi = rgd->rd_bits + x;
861 if (!bi->bi_clone)
862 continue;
Steven Whitehousef15ab562009-02-09 09:25:01 +0000863 if (sdp->sd_args.ar_discard)
864 gfs2_rgrp_send_discards(sdp, rgd->rd_data0, bi);
Steven Whitehouse60a0b8f2009-05-21 12:23:12 +0100865 clear_bit(GBF_FULL, &bi->bi_flags);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000866 memcpy(bi->bi_clone + bi->bi_offset,
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400867 bi->bi_bh->b_data + bi->bi_offset, bi->bi_len);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000868 }
869
870 spin_lock(&sdp->sd_rindex_spin);
Steven Whitehousecfc8b542008-11-04 10:25:13 +0000871 rgd->rd_free_clone = rgd->rd_free;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000872 spin_unlock(&sdp->sd_rindex_spin);
873}
874
875/**
876 * gfs2_alloc_get - get the struct gfs2_alloc structure for an inode
877 * @ip: the incore GFS2 inode structure
878 *
879 * Returns: the struct gfs2_alloc
880 */
881
882struct gfs2_alloc *gfs2_alloc_get(struct gfs2_inode *ip)
883{
Steven Whitehouse6dbd8222008-01-10 15:18:55 +0000884 BUG_ON(ip->i_alloc != NULL);
Steven Whitehouseea8d62d2010-01-29 15:48:57 +0000885 ip->i_alloc = kzalloc(sizeof(struct gfs2_alloc), GFP_NOFS);
Steven Whitehouse6dbd8222008-01-10 15:18:55 +0000886 return ip->i_alloc;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000887}
888
889/**
David Teiglandb3b94fa2006-01-16 16:50:04 +0000890 * try_rgrp_fit - See if a given reservation will fit in a given RG
891 * @rgd: the RG data
892 * @al: the struct gfs2_alloc structure describing the reservation
893 *
894 * If there's room for the requested blocks to be allocated from the RG:
David Teiglandb3b94fa2006-01-16 16:50:04 +0000895 * Sets the $al_rgd field in @al.
896 *
897 * Returns: 1 on success (it fits), 0 on failure (it doesn't fit)
898 */
899
900static int try_rgrp_fit(struct gfs2_rgrpd *rgd, struct gfs2_alloc *al)
901{
902 struct gfs2_sbd *sdp = rgd->rd_sbd;
903 int ret = 0;
904
Steven Whitehouse09010972009-05-20 10:48:47 +0100905 if (rgd->rd_flags & (GFS2_RGF_NOALLOC | GFS2_RDF_ERROR))
Steven Whitehousea43a4902007-04-02 10:48:17 +0100906 return 0;
907
David Teiglandb3b94fa2006-01-16 16:50:04 +0000908 spin_lock(&sdp->sd_rindex_spin);
909 if (rgd->rd_free_clone >= al->al_requested) {
910 al->al_rgd = rgd;
911 ret = 1;
912 }
913 spin_unlock(&sdp->sd_rindex_spin);
914
915 return ret;
916}
917
918/**
Steven Whitehousec8cdf472007-06-08 10:05:33 +0100919 * try_rgrp_unlink - Look for any unlinked, allocated, but unused inodes
920 * @rgd: The rgrp
921 *
Bob Peterson1a0eae82010-04-14 11:58:16 -0400922 * Returns: 0 if no error
923 * The inode, if one has been found, in inode.
Steven Whitehousec8cdf472007-06-08 10:05:33 +0100924 */
925
Steven Whitehouse044b9412010-11-03 20:01:07 +0000926static void try_rgrp_unlink(struct gfs2_rgrpd *rgd, u64 *last_unlinked, u64 skip)
Steven Whitehousec8cdf472007-06-08 10:05:33 +0100927{
Bob Peterson6760bdc2007-07-24 14:09:32 -0500928 u32 goal = 0, block;
Wendy Chengbb9bcf02007-06-27 17:07:08 -0400929 u64 no_addr;
Bob Peterson5f3eae72007-08-08 16:52:09 -0500930 struct gfs2_sbd *sdp = rgd->rd_sbd;
Steven Whitehouseb45e41d2008-02-06 10:11:15 +0000931 unsigned int n;
Steven Whitehouse044b9412010-11-03 20:01:07 +0000932 struct gfs2_glock *gl;
933 struct gfs2_inode *ip;
934 int error;
935 int found = 0;
Steven Whitehousec8cdf472007-06-08 10:05:33 +0100936
Steven Whitehouse044b9412010-11-03 20:01:07 +0000937 while (goal < rgd->rd_data) {
Bob Peterson5f3eae72007-08-08 16:52:09 -0500938 down_write(&sdp->sd_log_flush_lock);
Steven Whitehouseb45e41d2008-02-06 10:11:15 +0000939 n = 1;
Bob Peterson6760bdc2007-07-24 14:09:32 -0500940 block = rgblk_search(rgd, goal, GFS2_BLKST_UNLINKED,
Steven Whitehouseb45e41d2008-02-06 10:11:15 +0000941 GFS2_BLKST_UNLINKED, &n);
Bob Peterson5f3eae72007-08-08 16:52:09 -0500942 up_write(&sdp->sd_log_flush_lock);
Bob Peterson6760bdc2007-07-24 14:09:32 -0500943 if (block == BFITNOENT)
Bob Peterson24c73872007-07-12 16:58:50 -0500944 break;
Bob Peterson6760bdc2007-07-24 14:09:32 -0500945 /* rgblk_search can return a block < goal, so we need to
946 keep it marching forward. */
947 no_addr = block + rgd->rd_data0;
Bob Peterson24c73872007-07-12 16:58:50 -0500948 goal++;
Bob Peterson6760bdc2007-07-24 14:09:32 -0500949 if (*last_unlinked != NO_BLOCK && no_addr <= *last_unlinked)
Steven Whitehousec8cdf472007-06-08 10:05:33 +0100950 continue;
Steven Whitehouse1e19a192009-07-10 21:13:38 +0100951 if (no_addr == skip)
952 continue;
Wendy Chengbb9bcf02007-06-27 17:07:08 -0400953 *last_unlinked = no_addr;
Steven Whitehouse044b9412010-11-03 20:01:07 +0000954
955 error = gfs2_glock_get(sdp, no_addr, &gfs2_inode_glops, CREATE, &gl);
956 if (error)
957 continue;
958
959 /* If the inode is already in cache, we can ignore it here
960 * because the existing inode disposal code will deal with
961 * it when all refs have gone away. Accessing gl_object like
962 * this is not safe in general. Here it is ok because we do
963 * not dereference the pointer, and we only need an approx
964 * answer to whether it is NULL or not.
965 */
966 ip = gl->gl_object;
967
968 if (ip || queue_work(gfs2_delete_workqueue, &gl->gl_delete) == 0)
969 gfs2_glock_put(gl);
970 else
971 found++;
972
973 /* Limit reclaim to sensible number of tasks */
974 if (found > 2*NR_CPUS)
975 return;
Steven Whitehousec8cdf472007-06-08 10:05:33 +0100976 }
977
978 rgd->rd_flags &= ~GFS2_RDF_CHECK;
Steven Whitehouse044b9412010-11-03 20:01:07 +0000979 return;
Steven Whitehousec8cdf472007-06-08 10:05:33 +0100980}
981
982/**
David Teiglandb3b94fa2006-01-16 16:50:04 +0000983 * recent_rgrp_next - get next RG from "recent" list
984 * @cur_rgd: current rgrp
David Teiglandb3b94fa2006-01-16 16:50:04 +0000985 *
986 * Returns: The next rgrp in the recent list
987 */
988
Steven Whitehouse9cabcdb2008-07-10 15:54:12 +0100989static struct gfs2_rgrpd *recent_rgrp_next(struct gfs2_rgrpd *cur_rgd)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000990{
991 struct gfs2_sbd *sdp = cur_rgd->rd_sbd;
992 struct list_head *head;
993 struct gfs2_rgrpd *rgd;
994
995 spin_lock(&sdp->sd_rindex_spin);
Steven Whitehouse9cabcdb2008-07-10 15:54:12 +0100996 head = &sdp->sd_rindex_mru_list;
997 if (unlikely(cur_rgd->rd_list_mru.next == head)) {
998 spin_unlock(&sdp->sd_rindex_spin);
999 return NULL;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001000 }
Steven Whitehouse9cabcdb2008-07-10 15:54:12 +01001001 rgd = list_entry(cur_rgd->rd_list_mru.next, struct gfs2_rgrpd, rd_list_mru);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001002 spin_unlock(&sdp->sd_rindex_spin);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001003 return rgd;
1004}
1005
1006/**
David Teiglandb3b94fa2006-01-16 16:50:04 +00001007 * forward_rgrp_get - get an rgrp to try next from full list
1008 * @sdp: The GFS2 superblock
1009 *
1010 * Returns: The rgrp to try next
1011 */
1012
1013static struct gfs2_rgrpd *forward_rgrp_get(struct gfs2_sbd *sdp)
1014{
1015 struct gfs2_rgrpd *rgd;
1016 unsigned int journals = gfs2_jindex_size(sdp);
1017 unsigned int rg = 0, x;
1018
1019 spin_lock(&sdp->sd_rindex_spin);
1020
1021 rgd = sdp->sd_rindex_forward;
1022 if (!rgd) {
1023 if (sdp->sd_rgrps >= journals)
1024 rg = sdp->sd_rgrps * sdp->sd_jdesc->jd_jid / journals;
1025
Steven Whitehouseb8e1aab2006-08-22 16:25:50 -04001026 for (x = 0, rgd = gfs2_rgrpd_get_first(sdp); x < rg;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001027 x++, rgd = gfs2_rgrpd_get_next(rgd))
1028 /* Do Nothing */;
1029
1030 sdp->sd_rindex_forward = rgd;
1031 }
1032
1033 spin_unlock(&sdp->sd_rindex_spin);
1034
1035 return rgd;
1036}
1037
1038/**
1039 * forward_rgrp_set - set the forward rgrp pointer
1040 * @sdp: the filesystem
1041 * @rgd: The new forward rgrp
1042 *
1043 */
1044
1045static void forward_rgrp_set(struct gfs2_sbd *sdp, struct gfs2_rgrpd *rgd)
1046{
1047 spin_lock(&sdp->sd_rindex_spin);
1048 sdp->sd_rindex_forward = rgd;
1049 spin_unlock(&sdp->sd_rindex_spin);
1050}
1051
1052/**
1053 * get_local_rgrp - Choose and lock a rgrp for allocation
1054 * @ip: the inode to reserve space for
1055 * @rgp: the chosen and locked rgrp
1056 *
1057 * Try to acquire rgrp in way which avoids contending with others.
1058 *
1059 * Returns: errno
1060 */
1061
Steven Whitehouse044b9412010-11-03 20:01:07 +00001062static int get_local_rgrp(struct gfs2_inode *ip, u64 *last_unlinked)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001063{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001064 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001065 struct gfs2_rgrpd *rgd, *begin = NULL;
Steven Whitehouse6dbd8222008-01-10 15:18:55 +00001066 struct gfs2_alloc *al = ip->i_alloc;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001067 int flags = LM_FLAG_TRY;
1068 int skipped = 0;
1069 int loops = 0;
Abhijith Das292c8c12007-11-29 14:13:54 -06001070 int error, rg_locked;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001071
Steven Whitehouse9cabcdb2008-07-10 15:54:12 +01001072 rgd = gfs2_blk2rgrpd(sdp, ip->i_goal);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001073
1074 while (rgd) {
Abhijith Das292c8c12007-11-29 14:13:54 -06001075 rg_locked = 0;
1076
1077 if (gfs2_glock_is_locked_by_me(rgd->rd_gl)) {
1078 rg_locked = 1;
1079 error = 0;
1080 } else {
1081 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE,
1082 LM_FLAG_TRY, &al->al_rgd_gh);
1083 }
David Teiglandb3b94fa2006-01-16 16:50:04 +00001084 switch (error) {
1085 case 0:
1086 if (try_rgrp_fit(rgd, al))
1087 goto out;
Steven Whitehouse044b9412010-11-03 20:01:07 +00001088 if (rgd->rd_flags & GFS2_RDF_CHECK)
1089 try_rgrp_unlink(rgd, last_unlinked, ip->i_no_addr);
Abhijith Das292c8c12007-11-29 14:13:54 -06001090 if (!rg_locked)
1091 gfs2_glock_dq_uninit(&al->al_rgd_gh);
Steven Whitehouse9cabcdb2008-07-10 15:54:12 +01001092 /* fall through */
David Teiglandb3b94fa2006-01-16 16:50:04 +00001093 case GLR_TRYFAILED:
Steven Whitehouse9cabcdb2008-07-10 15:54:12 +01001094 rgd = recent_rgrp_next(rgd);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001095 break;
1096
1097 default:
Bob Petersoncc0581b2010-05-11 17:58:11 -04001098 return error;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001099 }
1100 }
1101
1102 /* Go through full list of rgrps */
1103
1104 begin = rgd = forward_rgrp_get(sdp);
1105
1106 for (;;) {
Abhijith Das292c8c12007-11-29 14:13:54 -06001107 rg_locked = 0;
1108
1109 if (gfs2_glock_is_locked_by_me(rgd->rd_gl)) {
1110 rg_locked = 1;
1111 error = 0;
1112 } else {
1113 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, flags,
1114 &al->al_rgd_gh);
1115 }
David Teiglandb3b94fa2006-01-16 16:50:04 +00001116 switch (error) {
1117 case 0:
1118 if (try_rgrp_fit(rgd, al))
1119 goto out;
Steven Whitehouse044b9412010-11-03 20:01:07 +00001120 if (rgd->rd_flags & GFS2_RDF_CHECK)
1121 try_rgrp_unlink(rgd, last_unlinked, ip->i_no_addr);
Abhijith Das292c8c12007-11-29 14:13:54 -06001122 if (!rg_locked)
1123 gfs2_glock_dq_uninit(&al->al_rgd_gh);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001124 break;
1125
1126 case GLR_TRYFAILED:
1127 skipped++;
1128 break;
1129
1130 default:
Bob Petersoncc0581b2010-05-11 17:58:11 -04001131 return error;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001132 }
1133
1134 rgd = gfs2_rgrpd_get_next(rgd);
1135 if (!rgd)
1136 rgd = gfs2_rgrpd_get_first(sdp);
1137
1138 if (rgd == begin) {
Benjamin Marzinski172e0452007-03-23 14:51:56 -06001139 if (++loops >= 3)
Bob Petersoncc0581b2010-05-11 17:58:11 -04001140 return -ENOSPC;
Benjamin Marzinski172e0452007-03-23 14:51:56 -06001141 if (!skipped)
1142 loops++;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001143 flags = 0;
Benjamin Marzinski172e0452007-03-23 14:51:56 -06001144 if (loops == 2)
1145 gfs2_log_flush(sdp, NULL);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001146 }
1147 }
1148
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001149out:
David Teiglandb3b94fa2006-01-16 16:50:04 +00001150 if (begin) {
Steven Whitehouse9cabcdb2008-07-10 15:54:12 +01001151 spin_lock(&sdp->sd_rindex_spin);
1152 list_move(&rgd->rd_list_mru, &sdp->sd_rindex_mru_list);
1153 spin_unlock(&sdp->sd_rindex_spin);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001154 rgd = gfs2_rgrpd_get_next(rgd);
1155 if (!rgd)
1156 rgd = gfs2_rgrpd_get_first(sdp);
1157 forward_rgrp_set(sdp, rgd);
1158 }
1159
Bob Petersoncc0581b2010-05-11 17:58:11 -04001160 return 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001161}
1162
1163/**
1164 * gfs2_inplace_reserve_i - Reserve space in the filesystem
1165 * @ip: the inode to reserve space for
1166 *
1167 * Returns: errno
1168 */
1169
Bob Peterson46290342010-09-30 10:34:00 -04001170int gfs2_inplace_reserve_i(struct gfs2_inode *ip, int hold_rindex,
1171 char *file, unsigned int line)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001172{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001173 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
Steven Whitehouse6dbd8222008-01-10 15:18:55 +00001174 struct gfs2_alloc *al = ip->i_alloc;
Robert Peterson7ae8fa82007-05-09 09:37:57 -05001175 int error = 0;
Steven Whitehouse044b9412010-11-03 20:01:07 +00001176 u64 last_unlinked = NO_BLOCK;
1177 int tries = 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001178
1179 if (gfs2_assert_warn(sdp, al->al_requested))
1180 return -EINVAL;
1181
Bob Peterson46290342010-09-30 10:34:00 -04001182 if (hold_rindex) {
1183 /* We need to hold the rindex unless the inode we're using is
1184 the rindex itself, in which case it's already held. */
1185 if (ip != GFS2_I(sdp->sd_rindex))
1186 error = gfs2_rindex_hold(sdp, &al->al_ri_gh);
1187 else if (!sdp->sd_rgrps) /* We may not have the rindex read
1188 in, so: */
Benjamin Marzinski0489b3f2010-11-30 09:38:35 -06001189 error = gfs2_ri_update(ip);
Steven Whitehouse044b9412010-11-03 20:01:07 +00001190 if (error)
1191 return error;
Bob Peterson46290342010-09-30 10:34:00 -04001192 }
Robert Peterson7ae8fa82007-05-09 09:37:57 -05001193
Benjamin Marzinski0489b3f2010-11-30 09:38:35 -06001194try_again:
Steven Whitehouse044b9412010-11-03 20:01:07 +00001195 do {
1196 error = get_local_rgrp(ip, &last_unlinked);
1197 /* If there is no space, flushing the log may release some */
Benjamin Marzinski0489b3f2010-11-30 09:38:35 -06001198 if (error) {
1199 if (ip == GFS2_I(sdp->sd_rindex) &&
1200 !sdp->sd_rindex_uptodate) {
1201 error = gfs2_ri_update(ip);
1202 if (error)
1203 return error;
1204 goto try_again;
1205 }
Steven Whitehouse044b9412010-11-03 20:01:07 +00001206 gfs2_log_flush(sdp, NULL);
Benjamin Marzinski0489b3f2010-11-30 09:38:35 -06001207 }
Steven Whitehouse044b9412010-11-03 20:01:07 +00001208 } while (error && tries++ < 3);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001209
Bob Petersoncc0581b2010-05-11 17:58:11 -04001210 if (error) {
Bob Peterson46290342010-09-30 10:34:00 -04001211 if (hold_rindex && ip != GFS2_I(sdp->sd_rindex))
Robert Peterson7ae8fa82007-05-09 09:37:57 -05001212 gfs2_glock_dq_uninit(&al->al_ri_gh);
Steven Whitehouse044b9412010-11-03 20:01:07 +00001213 return error;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001214 }
Steven Whitehouse044b9412010-11-03 20:01:07 +00001215
Bob Petersoned4878e2010-05-20 23:30:11 -04001216 /* no error, so we have the rgrp set in the inode's allocation. */
David Teiglandb3b94fa2006-01-16 16:50:04 +00001217 al->al_file = file;
1218 al->al_line = line;
1219
1220 return 0;
1221}
1222
1223/**
1224 * gfs2_inplace_release - release an inplace reservation
1225 * @ip: the inode the reservation was taken out on
1226 *
1227 * Release a reservation made by gfs2_inplace_reserve().
1228 */
1229
1230void gfs2_inplace_release(struct gfs2_inode *ip)
1231{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001232 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
Steven Whitehouse6dbd8222008-01-10 15:18:55 +00001233 struct gfs2_alloc *al = ip->i_alloc;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001234
1235 if (gfs2_assert_warn(sdp, al->al_alloced <= al->al_requested) == -1)
1236 fs_warn(sdp, "al_alloced = %u, al_requested = %u "
1237 "al_file = %s, al_line = %u\n",
1238 al->al_alloced, al->al_requested, al->al_file,
1239 al->al_line);
1240
1241 al->al_rgd = NULL;
Abhijith Das292c8c12007-11-29 14:13:54 -06001242 if (al->al_rgd_gh.gh_gl)
1243 gfs2_glock_dq_uninit(&al->al_rgd_gh);
Bob Peterson46290342010-09-30 10:34:00 -04001244 if (ip != GFS2_I(sdp->sd_rindex) && al->al_ri_gh.gh_gl)
Robert Peterson7ae8fa82007-05-09 09:37:57 -05001245 gfs2_glock_dq_uninit(&al->al_ri_gh);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001246}
1247
1248/**
1249 * gfs2_get_block_type - Check a block in a RG is of given type
1250 * @rgd: the resource group holding the block
1251 * @block: the block number
1252 *
1253 * Returns: The block type (GFS2_BLKST_*)
1254 */
1255
Steven Whitehouseacf7e242009-09-08 18:00:30 +01001256static unsigned char gfs2_get_block_type(struct gfs2_rgrpd *rgd, u64 block)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001257{
1258 struct gfs2_bitmap *bi = NULL;
Steven Whitehousecd915492006-09-04 12:49:07 -04001259 u32 length, rgrp_block, buf_block;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001260 unsigned int buf;
1261 unsigned char type;
1262
Steven Whitehousebb8d8a62007-06-01 14:11:58 +01001263 length = rgd->rd_length;
1264 rgrp_block = block - rgd->rd_data0;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001265
1266 for (buf = 0; buf < length; buf++) {
1267 bi = rgd->rd_bits + buf;
1268 if (rgrp_block < (bi->bi_start + bi->bi_len) * GFS2_NBBY)
1269 break;
1270 }
1271
1272 gfs2_assert(rgd->rd_sbd, buf < length);
1273 buf_block = rgrp_block - bi->bi_start * GFS2_NBBY;
1274
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001275 type = gfs2_testbit(rgd, bi->bi_bh->b_data + bi->bi_offset,
David Teiglandb3b94fa2006-01-16 16:50:04 +00001276 bi->bi_len, buf_block);
1277
1278 return type;
1279}
1280
1281/**
1282 * rgblk_search - find a block in @old_state, change allocation
1283 * state to @new_state
1284 * @rgd: the resource group descriptor
1285 * @goal: the goal block within the RG (start here to search for avail block)
1286 * @old_state: GFS2_BLKST_XXX the before-allocation state to find
1287 * @new_state: GFS2_BLKST_XXX the after-allocation block state
Steven Whitehouseb45e41d2008-02-06 10:11:15 +00001288 * @n: The extent length
David Teiglandb3b94fa2006-01-16 16:50:04 +00001289 *
1290 * Walk rgrp's bitmap to find bits that represent a block in @old_state.
1291 * Add the found bitmap buffer to the transaction.
1292 * Set the found bits to @new_state to change block's allocation state.
1293 *
1294 * This function never fails, because we wouldn't call it unless we
1295 * know (from reservation results, etc.) that a block is available.
1296 *
1297 * Scope of @goal and returned block is just within rgrp, not the whole
1298 * filesystem.
1299 *
1300 * Returns: the block number allocated
1301 */
1302
Steven Whitehousecd915492006-09-04 12:49:07 -04001303static u32 rgblk_search(struct gfs2_rgrpd *rgd, u32 goal,
Steven Whitehouseb45e41d2008-02-06 10:11:15 +00001304 unsigned char old_state, unsigned char new_state,
1305 unsigned int *n)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001306{
1307 struct gfs2_bitmap *bi = NULL;
Steven Whitehouseb45e41d2008-02-06 10:11:15 +00001308 const u32 length = rgd->rd_length;
Steven Whitehouse60a0b8f2009-05-21 12:23:12 +01001309 u32 blk = BFITNOENT;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001310 unsigned int buf, x;
Steven Whitehouseb45e41d2008-02-06 10:11:15 +00001311 const unsigned int elen = *n;
Steven Whitehouse60a0b8f2009-05-21 12:23:12 +01001312 const u8 *buffer = NULL;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001313
Steven Whitehouseb45e41d2008-02-06 10:11:15 +00001314 *n = 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001315 /* Find bitmap block that contains bits for goal block */
1316 for (buf = 0; buf < length; buf++) {
1317 bi = rgd->rd_bits + buf;
Steven Whitehouse60a0b8f2009-05-21 12:23:12 +01001318 /* Convert scope of "goal" from rgrp-wide to within found bit block */
1319 if (goal < (bi->bi_start + bi->bi_len) * GFS2_NBBY) {
1320 goal -= bi->bi_start * GFS2_NBBY;
1321 goto do_search;
1322 }
David Teiglandb3b94fa2006-01-16 16:50:04 +00001323 }
Steven Whitehouse60a0b8f2009-05-21 12:23:12 +01001324 buf = 0;
1325 goal = 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001326
Steven Whitehouse60a0b8f2009-05-21 12:23:12 +01001327do_search:
David Teiglandb3b94fa2006-01-16 16:50:04 +00001328 /* Search (up to entire) bitmap in this rgrp for allocatable block.
1329 "x <= length", instead of "x < length", because we typically start
1330 the search in the middle of a bit block, but if we can't find an
1331 allocatable block anywhere else, we want to be able wrap around and
1332 search in the first part of our first-searched bit block. */
1333 for (x = 0; x <= length; x++) {
Steven Whitehouse60a0b8f2009-05-21 12:23:12 +01001334 bi = rgd->rd_bits + buf;
1335
1336 if (test_bit(GBF_FULL, &bi->bi_flags) &&
1337 (old_state == GFS2_BLKST_FREE))
1338 goto skip;
1339
Bob Peterson5f3eae72007-08-08 16:52:09 -05001340 /* The GFS2_BLKST_UNLINKED state doesn't apply to the clone
1341 bitmaps, so we must search the originals for that. */
Steven Whitehouseb45e41d2008-02-06 10:11:15 +00001342 buffer = bi->bi_bh->b_data + bi->bi_offset;
Bob Peterson5f3eae72007-08-08 16:52:09 -05001343 if (old_state != GFS2_BLKST_UNLINKED && bi->bi_clone)
Steven Whitehouse110acf32008-01-29 13:30:20 +00001344 buffer = bi->bi_clone + bi->bi_offset;
1345
1346 blk = gfs2_bitfit(buffer, bi->bi_len, goal, old_state);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001347 if (blk != BFITNOENT)
1348 break;
1349
Steven Whitehouse60a0b8f2009-05-21 12:23:12 +01001350 if ((goal == 0) && (old_state == GFS2_BLKST_FREE))
1351 set_bit(GBF_FULL, &bi->bi_flags);
1352
David Teiglandb3b94fa2006-01-16 16:50:04 +00001353 /* Try next bitmap block (wrap back to rgrp header if at end) */
Steven Whitehouse60a0b8f2009-05-21 12:23:12 +01001354skip:
1355 buf++;
1356 buf %= length;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001357 goal = 0;
1358 }
1359
Steven Whitehouse60a0b8f2009-05-21 12:23:12 +01001360 if (blk == BFITNOENT)
1361 return blk;
1362 *n = 1;
1363 if (old_state == new_state)
1364 goto out;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001365
Steven Whitehouse60a0b8f2009-05-21 12:23:12 +01001366 gfs2_trans_add_bh(rgd->rd_gl, bi->bi_bh, 1);
1367 gfs2_setbit(rgd, bi->bi_bh->b_data, bi->bi_clone, bi->bi_offset,
1368 bi->bi_len, blk, new_state);
1369 goal = blk;
1370 while (*n < elen) {
1371 goal++;
1372 if (goal >= (bi->bi_len * GFS2_NBBY))
1373 break;
1374 if (gfs2_testbit(rgd, buffer, bi->bi_len, goal) !=
1375 GFS2_BLKST_FREE)
1376 break;
1377 gfs2_setbit(rgd, bi->bi_bh->b_data, bi->bi_clone, bi->bi_offset,
1378 bi->bi_len, goal, new_state);
1379 (*n)++;
1380 }
1381out:
1382 return (bi->bi_start * GFS2_NBBY) + blk;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001383}
1384
1385/**
1386 * rgblk_free - Change alloc state of given block(s)
1387 * @sdp: the filesystem
1388 * @bstart: the start of a run of blocks to free
1389 * @blen: the length of the block run (all must lie within ONE RG!)
1390 * @new_state: GFS2_BLKST_XXX the after-allocation block state
1391 *
1392 * Returns: Resource group containing the block(s)
1393 */
1394
Steven Whitehousecd915492006-09-04 12:49:07 -04001395static struct gfs2_rgrpd *rgblk_free(struct gfs2_sbd *sdp, u64 bstart,
1396 u32 blen, unsigned char new_state)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001397{
1398 struct gfs2_rgrpd *rgd;
1399 struct gfs2_bitmap *bi = NULL;
Steven Whitehousecd915492006-09-04 12:49:07 -04001400 u32 length, rgrp_blk, buf_blk;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001401 unsigned int buf;
1402
1403 rgd = gfs2_blk2rgrpd(sdp, bstart);
1404 if (!rgd) {
1405 if (gfs2_consist(sdp))
Steven Whitehouse382066d2006-05-24 10:22:09 -04001406 fs_err(sdp, "block = %llu\n", (unsigned long long)bstart);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001407 return NULL;
1408 }
1409
Steven Whitehousebb8d8a62007-06-01 14:11:58 +01001410 length = rgd->rd_length;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001411
Steven Whitehousebb8d8a62007-06-01 14:11:58 +01001412 rgrp_blk = bstart - rgd->rd_data0;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001413
1414 while (blen--) {
1415 for (buf = 0; buf < length; buf++) {
1416 bi = rgd->rd_bits + buf;
1417 if (rgrp_blk < (bi->bi_start + bi->bi_len) * GFS2_NBBY)
1418 break;
1419 }
1420
1421 gfs2_assert(rgd->rd_sbd, buf < length);
1422
1423 buf_blk = rgrp_blk - bi->bi_start * GFS2_NBBY;
1424 rgrp_blk++;
1425
1426 if (!bi->bi_clone) {
1427 bi->bi_clone = kmalloc(bi->bi_bh->b_size,
Steven Whitehousedd894be2006-07-27 14:29:00 -04001428 GFP_NOFS | __GFP_NOFAIL);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001429 memcpy(bi->bi_clone + bi->bi_offset,
1430 bi->bi_bh->b_data + bi->bi_offset,
1431 bi->bi_len);
1432 }
Steven Whitehoused4e9c4c2006-01-18 11:19:28 +00001433 gfs2_trans_add_bh(rgd->rd_gl, bi->bi_bh, 1);
Steven Whitehouseb45e41d2008-02-06 10:11:15 +00001434 gfs2_setbit(rgd, bi->bi_bh->b_data, NULL, bi->bi_offset,
David Teiglandb3b94fa2006-01-16 16:50:04 +00001435 bi->bi_len, buf_blk, new_state);
1436 }
1437
1438 return rgd;
1439}
1440
1441/**
Steven Whitehouse09010972009-05-20 10:48:47 +01001442 * gfs2_rgrp_dump - print out an rgrp
1443 * @seq: The iterator
1444 * @gl: The glock in question
David Teiglandb3b94fa2006-01-16 16:50:04 +00001445 *
David Teiglandb3b94fa2006-01-16 16:50:04 +00001446 */
1447
Steven Whitehouse09010972009-05-20 10:48:47 +01001448int gfs2_rgrp_dump(struct seq_file *seq, const struct gfs2_glock *gl)
1449{
1450 const struct gfs2_rgrpd *rgd = gl->gl_object;
1451 if (rgd == NULL)
1452 return 0;
1453 gfs2_print_dbg(seq, " R: n:%llu f:%02x b:%u/%u i:%u\n",
1454 (unsigned long long)rgd->rd_addr, rgd->rd_flags,
1455 rgd->rd_free, rgd->rd_free_clone, rgd->rd_dinodes);
1456 return 0;
1457}
1458
Steven Whitehouse6050b9c2009-07-31 16:19:40 +01001459static void gfs2_rgrp_error(struct gfs2_rgrpd *rgd)
1460{
1461 struct gfs2_sbd *sdp = rgd->rd_sbd;
1462 fs_warn(sdp, "rgrp %llu has an error, marking it readonly until umount\n",
Steven Whitehouse86d00632009-09-14 09:50:57 +01001463 (unsigned long long)rgd->rd_addr);
Steven Whitehouse6050b9c2009-07-31 16:19:40 +01001464 fs_warn(sdp, "umount on all nodes and run fsck.gfs2 to fix the error\n");
1465 gfs2_rgrp_dump(NULL, rgd->rd_gl);
1466 rgd->rd_flags |= GFS2_RDF_ERROR;
1467}
1468
Steven Whitehouse09010972009-05-20 10:48:47 +01001469/**
1470 * gfs2_alloc_block - Allocate one or more blocks
1471 * @ip: the inode to allocate the block for
1472 * @bn: Used to return the starting block number
1473 * @n: requested number of blocks/extent length (value/result)
1474 *
1475 * Returns: 0 or error
1476 */
1477
1478int gfs2_alloc_block(struct gfs2_inode *ip, u64 *bn, unsigned int *n)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001479{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001480 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
Steven Whitehoused9ba7612009-04-23 08:59:41 +01001481 struct buffer_head *dibh;
Steven Whitehouse6dbd8222008-01-10 15:18:55 +00001482 struct gfs2_alloc *al = ip->i_alloc;
Steven Whitehouse9a3f2362010-08-23 11:49:34 +01001483 struct gfs2_rgrpd *rgd;
Steven Whitehousecd915492006-09-04 12:49:07 -04001484 u32 goal, blk;
1485 u64 block;
Steven Whitehoused9ba7612009-04-23 08:59:41 +01001486 int error;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001487
Steven Whitehouse9a3f2362010-08-23 11:49:34 +01001488 /* Only happens if there is a bug in gfs2, return something distinctive
1489 * to ensure that it is noticed.
1490 */
1491 if (al == NULL)
1492 return -ECANCELED;
1493
1494 rgd = al->al_rgd;
1495
Steven Whitehousece276b02008-02-06 09:25:45 +00001496 if (rgrp_contains_block(rgd, ip->i_goal))
1497 goal = ip->i_goal - rgd->rd_data0;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001498 else
Steven Whitehouseac576cc2008-02-01 10:34:15 +00001499 goal = rgd->rd_last_alloc;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001500
Steven Whitehouseb45e41d2008-02-06 10:11:15 +00001501 blk = rgblk_search(rgd, goal, GFS2_BLKST_FREE, GFS2_BLKST_USED, n);
Steven Whitehouse09010972009-05-20 10:48:47 +01001502
1503 /* Since all blocks are reserved in advance, this shouldn't happen */
1504 if (blk == BFITNOENT)
1505 goto rgrp_error;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001506
Steven Whitehouseb45e41d2008-02-06 10:11:15 +00001507 rgd->rd_last_alloc = blk;
Steven Whitehousebb8d8a62007-06-01 14:11:58 +01001508 block = rgd->rd_data0 + blk;
Steven Whitehousece276b02008-02-06 09:25:45 +00001509 ip->i_goal = block;
Steven Whitehoused9ba7612009-04-23 08:59:41 +01001510 error = gfs2_meta_inode_buffer(ip, &dibh);
1511 if (error == 0) {
1512 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
1513 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1514 di->di_goal_meta = di->di_goal_data = cpu_to_be64(ip->i_goal);
1515 brelse(dibh);
1516 }
Steven Whitehouse09010972009-05-20 10:48:47 +01001517 if (rgd->rd_free < *n)
1518 goto rgrp_error;
1519
Steven Whitehousecfc8b542008-11-04 10:25:13 +00001520 rgd->rd_free -= *n;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001521
Steven Whitehoused4e9c4c2006-01-18 11:19:28 +00001522 gfs2_trans_add_bh(rgd->rd_gl, rgd->rd_bits[0].bi_bh, 1);
Bob Peterson42d52e32008-01-28 18:38:07 -06001523 gfs2_rgrp_out(rgd, rgd->rd_bits[0].bi_bh->b_data);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001524
Steven Whitehouseb45e41d2008-02-06 10:11:15 +00001525 al->al_alloced += *n;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001526
Andrew Pricead99f772008-05-01 11:55:38 +01001527 gfs2_statfs_change(sdp, 0, -(s64)*n, 0);
Steven Whitehouseb45e41d2008-02-06 10:11:15 +00001528 gfs2_quota_change(ip, *n, ip->i_inode.i_uid, ip->i_inode.i_gid);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001529
1530 spin_lock(&sdp->sd_rindex_spin);
Steven Whitehouseb45e41d2008-02-06 10:11:15 +00001531 rgd->rd_free_clone -= *n;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001532 spin_unlock(&sdp->sd_rindex_spin);
Steven Whitehouse63997772009-06-12 08:49:20 +01001533 trace_gfs2_block_alloc(ip, block, *n, GFS2_BLKST_USED);
Steven Whitehouse09010972009-05-20 10:48:47 +01001534 *bn = block;
1535 return 0;
1536
1537rgrp_error:
Steven Whitehouse6050b9c2009-07-31 16:19:40 +01001538 gfs2_rgrp_error(rgd);
Steven Whitehouse09010972009-05-20 10:48:47 +01001539 return -EIO;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001540}
1541
1542/**
1543 * gfs2_alloc_di - Allocate a dinode
1544 * @dip: the directory that the inode is going in
Steven Whitehouse6050b9c2009-07-31 16:19:40 +01001545 * @bn: the block number which is allocated
1546 * @generation: the generation number of the inode
David Teiglandb3b94fa2006-01-16 16:50:04 +00001547 *
Steven Whitehouse6050b9c2009-07-31 16:19:40 +01001548 * Returns: 0 on success or error
David Teiglandb3b94fa2006-01-16 16:50:04 +00001549 */
1550
Steven Whitehouse6050b9c2009-07-31 16:19:40 +01001551int gfs2_alloc_di(struct gfs2_inode *dip, u64 *bn, u64 *generation)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001552{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001553 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
Steven Whitehouse6dbd8222008-01-10 15:18:55 +00001554 struct gfs2_alloc *al = dip->i_alloc;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001555 struct gfs2_rgrpd *rgd = al->al_rgd;
Steven Whitehouse4340fe62006-07-11 09:46:33 -04001556 u32 blk;
1557 u64 block;
Steven Whitehouseb45e41d2008-02-06 10:11:15 +00001558 unsigned int n = 1;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001559
Steven Whitehouseac576cc2008-02-01 10:34:15 +00001560 blk = rgblk_search(rgd, rgd->rd_last_alloc,
Steven Whitehouseb45e41d2008-02-06 10:11:15 +00001561 GFS2_BLKST_FREE, GFS2_BLKST_DINODE, &n);
Steven Whitehouse6050b9c2009-07-31 16:19:40 +01001562
1563 /* Since all blocks are reserved in advance, this shouldn't happen */
1564 if (blk == BFITNOENT)
1565 goto rgrp_error;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001566
Steven Whitehouseac576cc2008-02-01 10:34:15 +00001567 rgd->rd_last_alloc = blk;
Steven Whitehousebb8d8a62007-06-01 14:11:58 +01001568 block = rgd->rd_data0 + blk;
Steven Whitehouse05164e52009-08-17 11:06:43 +01001569 if (rgd->rd_free == 0)
1570 goto rgrp_error;
1571
Steven Whitehousecfc8b542008-11-04 10:25:13 +00001572 rgd->rd_free--;
Steven Whitehouse73f74942008-11-04 10:32:57 +00001573 rgd->rd_dinodes++;
Steven Whitehoused8b71f72008-11-04 10:19:03 +00001574 *generation = rgd->rd_igeneration++;
Steven Whitehouse8d8291a2009-08-27 15:51:07 +01001575 if (*generation == 0)
1576 *generation = rgd->rd_igeneration++;
Steven Whitehoused4e9c4c2006-01-18 11:19:28 +00001577 gfs2_trans_add_bh(rgd->rd_gl, rgd->rd_bits[0].bi_bh, 1);
Bob Peterson42d52e32008-01-28 18:38:07 -06001578 gfs2_rgrp_out(rgd, rgd->rd_bits[0].bi_bh->b_data);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001579
1580 al->al_alloced++;
1581
1582 gfs2_statfs_change(sdp, 0, -1, +1);
Steven Whitehouse5731be52008-02-01 13:16:55 +00001583 gfs2_trans_add_unrevoke(sdp, block, 1);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001584
1585 spin_lock(&sdp->sd_rindex_spin);
1586 rgd->rd_free_clone--;
1587 spin_unlock(&sdp->sd_rindex_spin);
Steven Whitehouse63997772009-06-12 08:49:20 +01001588 trace_gfs2_block_alloc(dip, block, 1, GFS2_BLKST_DINODE);
Steven Whitehouse6050b9c2009-07-31 16:19:40 +01001589 *bn = block;
1590 return 0;
1591
1592rgrp_error:
1593 gfs2_rgrp_error(rgd);
1594 return -EIO;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001595}
1596
1597/**
1598 * gfs2_free_data - free a contiguous run of data block(s)
1599 * @ip: the inode these blocks are being freed from
1600 * @bstart: first block of a run of contiguous blocks
1601 * @blen: the length of the block run
1602 *
1603 */
1604
Bob Peterson4c16c362011-02-23 16:11:33 -05001605void __gfs2_free_data(struct gfs2_inode *ip, u64 bstart, u32 blen)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001606{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001607 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001608 struct gfs2_rgrpd *rgd;
1609
1610 rgd = rgblk_free(sdp, bstart, blen, GFS2_BLKST_FREE);
1611 if (!rgd)
1612 return;
Steven Whitehouse63997772009-06-12 08:49:20 +01001613 trace_gfs2_block_alloc(ip, bstart, blen, GFS2_BLKST_FREE);
Steven Whitehousecfc8b542008-11-04 10:25:13 +00001614 rgd->rd_free += blen;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001615
Steven Whitehoused4e9c4c2006-01-18 11:19:28 +00001616 gfs2_trans_add_bh(rgd->rd_gl, rgd->rd_bits[0].bi_bh, 1);
Bob Peterson42d52e32008-01-28 18:38:07 -06001617 gfs2_rgrp_out(rgd, rgd->rd_bits[0].bi_bh->b_data);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001618
1619 gfs2_trans_add_rg(rgd);
Bob Peterson4c16c362011-02-23 16:11:33 -05001620}
David Teiglandb3b94fa2006-01-16 16:50:04 +00001621
Bob Peterson4c16c362011-02-23 16:11:33 -05001622/**
1623 * gfs2_free_data - free a contiguous run of data block(s)
1624 * @ip: the inode these blocks are being freed from
1625 * @bstart: first block of a run of contiguous blocks
1626 * @blen: the length of the block run
1627 *
1628 */
1629
1630void gfs2_free_data(struct gfs2_inode *ip, u64 bstart, u32 blen)
1631{
1632 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1633
1634 __gfs2_free_data(ip, bstart, blen);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001635 gfs2_statfs_change(sdp, 0, +blen, 0);
Steven Whitehouse2933f922006-11-01 13:23:29 -05001636 gfs2_quota_change(ip, -(s64)blen, ip->i_inode.i_uid, ip->i_inode.i_gid);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001637}
1638
1639/**
1640 * 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
Bob Peterson4c16c362011-02-23 16:11:33 -05001647void __gfs2_free_meta(struct gfs2_inode *ip, u64 bstart, u32 blen)
1648{
1649 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1650 struct gfs2_rgrpd *rgd;
1651
1652 rgd = rgblk_free(sdp, bstart, blen, GFS2_BLKST_FREE);
1653 if (!rgd)
1654 return;
1655 trace_gfs2_block_alloc(ip, bstart, blen, GFS2_BLKST_FREE);
1656 rgd->rd_free += blen;
1657
1658 gfs2_trans_add_bh(rgd->rd_gl, rgd->rd_bits[0].bi_bh, 1);
1659 gfs2_rgrp_out(rgd, rgd->rd_bits[0].bi_bh->b_data);
1660
1661 gfs2_trans_add_rg(rgd);
1662 gfs2_meta_wipe(ip, bstart, blen);
1663}
1664
1665/**
1666 * gfs2_free_meta - free a contiguous run of data block(s)
1667 * @ip: the inode these blocks are being freed from
1668 * @bstart: first block of a run of contiguous blocks
1669 * @blen: the length of the block run
1670 *
1671 */
1672
Steven Whitehousecd915492006-09-04 12:49:07 -04001673void gfs2_free_meta(struct gfs2_inode *ip, u64 bstart, u32 blen)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001674{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001675 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001676
Bob Peterson4c16c362011-02-23 16:11:33 -05001677 __gfs2_free_meta(ip, bstart, blen);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001678 gfs2_statfs_change(sdp, 0, +blen, 0);
Steven Whitehouse2933f922006-11-01 13:23:29 -05001679 gfs2_quota_change(ip, -(s64)blen, ip->i_inode.i_uid, ip->i_inode.i_gid);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001680}
1681
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001682void gfs2_unlink_di(struct inode *inode)
1683{
1684 struct gfs2_inode *ip = GFS2_I(inode);
1685 struct gfs2_sbd *sdp = GFS2_SB(inode);
1686 struct gfs2_rgrpd *rgd;
Steven Whitehousedbb7cae2007-05-15 15:37:50 +01001687 u64 blkno = ip->i_no_addr;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001688
1689 rgd = rgblk_free(sdp, blkno, 1, GFS2_BLKST_UNLINKED);
1690 if (!rgd)
1691 return;
Steven Whitehouse63997772009-06-12 08:49:20 +01001692 trace_gfs2_block_alloc(ip, blkno, 1, GFS2_BLKST_UNLINKED);
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001693 gfs2_trans_add_bh(rgd->rd_gl, rgd->rd_bits[0].bi_bh, 1);
Bob Peterson42d52e32008-01-28 18:38:07 -06001694 gfs2_rgrp_out(rgd, rgd->rd_bits[0].bi_bh->b_data);
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001695 gfs2_trans_add_rg(rgd);
1696}
1697
Steven Whitehousecd915492006-09-04 12:49:07 -04001698static void gfs2_free_uninit_di(struct gfs2_rgrpd *rgd, u64 blkno)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001699{
1700 struct gfs2_sbd *sdp = rgd->rd_sbd;
1701 struct gfs2_rgrpd *tmp_rgd;
1702
1703 tmp_rgd = rgblk_free(sdp, blkno, 1, GFS2_BLKST_FREE);
1704 if (!tmp_rgd)
1705 return;
1706 gfs2_assert_withdraw(sdp, rgd == tmp_rgd);
1707
Steven Whitehouse73f74942008-11-04 10:32:57 +00001708 if (!rgd->rd_dinodes)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001709 gfs2_consist_rgrpd(rgd);
Steven Whitehouse73f74942008-11-04 10:32:57 +00001710 rgd->rd_dinodes--;
Steven Whitehousecfc8b542008-11-04 10:25:13 +00001711 rgd->rd_free++;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001712
Steven Whitehoused4e9c4c2006-01-18 11:19:28 +00001713 gfs2_trans_add_bh(rgd->rd_gl, rgd->rd_bits[0].bi_bh, 1);
Bob Peterson42d52e32008-01-28 18:38:07 -06001714 gfs2_rgrp_out(rgd, rgd->rd_bits[0].bi_bh->b_data);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001715
1716 gfs2_statfs_change(sdp, 0, +1, -1);
1717 gfs2_trans_add_rg(rgd);
1718}
1719
David Teiglandb3b94fa2006-01-16 16:50:04 +00001720
1721void gfs2_free_di(struct gfs2_rgrpd *rgd, struct gfs2_inode *ip)
1722{
Steven Whitehousedbb7cae2007-05-15 15:37:50 +01001723 gfs2_free_uninit_di(rgd, ip->i_no_addr);
Steven Whitehouse63997772009-06-12 08:49:20 +01001724 trace_gfs2_block_alloc(ip, ip->i_no_addr, 1, GFS2_BLKST_FREE);
Steven Whitehouse2933f922006-11-01 13:23:29 -05001725 gfs2_quota_change(ip, -1, ip->i_inode.i_uid, ip->i_inode.i_gid);
Steven Whitehousedbb7cae2007-05-15 15:37:50 +01001726 gfs2_meta_wipe(ip, ip->i_no_addr, 1);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001727}
1728
1729/**
Steven Whitehouseacf7e242009-09-08 18:00:30 +01001730 * gfs2_check_blk_type - Check the type of a block
1731 * @sdp: The superblock
1732 * @no_addr: The block number to check
1733 * @type: The block type we are looking for
1734 *
1735 * Returns: 0 if the block type matches the expected type
1736 * -ESTALE if it doesn't match
1737 * or -ve errno if something went wrong while checking
1738 */
1739
1740int gfs2_check_blk_type(struct gfs2_sbd *sdp, u64 no_addr, unsigned int type)
1741{
1742 struct gfs2_rgrpd *rgd;
1743 struct gfs2_holder ri_gh, rgd_gh;
Steven Whitehouse2c776342009-11-06 11:10:51 +00001744 struct gfs2_inode *ip = GFS2_I(sdp->sd_rindex);
1745 int ri_locked = 0;
Steven Whitehouseacf7e242009-09-08 18:00:30 +01001746 int error;
1747
Steven Whitehouse2c776342009-11-06 11:10:51 +00001748 if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
1749 error = gfs2_rindex_hold(sdp, &ri_gh);
1750 if (error)
1751 goto fail;
1752 ri_locked = 1;
1753 }
Steven Whitehouseacf7e242009-09-08 18:00:30 +01001754
1755 error = -EINVAL;
1756 rgd = gfs2_blk2rgrpd(sdp, no_addr);
1757 if (!rgd)
1758 goto fail_rindex;
1759
1760 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_SHARED, 0, &rgd_gh);
1761 if (error)
1762 goto fail_rindex;
1763
1764 if (gfs2_get_block_type(rgd, no_addr) != type)
1765 error = -ESTALE;
1766
1767 gfs2_glock_dq_uninit(&rgd_gh);
1768fail_rindex:
Steven Whitehouse2c776342009-11-06 11:10:51 +00001769 if (ri_locked)
1770 gfs2_glock_dq_uninit(&ri_gh);
Steven Whitehouseacf7e242009-09-08 18:00:30 +01001771fail:
1772 return error;
1773}
1774
1775/**
David Teiglandb3b94fa2006-01-16 16:50:04 +00001776 * gfs2_rlist_add - add a RG to a list of RGs
1777 * @sdp: the filesystem
1778 * @rlist: the list of resource groups
1779 * @block: the block
1780 *
1781 * Figure out what RG a block belongs to and add that RG to the list
1782 *
1783 * FIXME: Don't use NOFAIL
1784 *
1785 */
1786
1787void gfs2_rlist_add(struct gfs2_sbd *sdp, struct gfs2_rgrp_list *rlist,
Steven Whitehousecd915492006-09-04 12:49:07 -04001788 u64 block)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001789{
1790 struct gfs2_rgrpd *rgd;
1791 struct gfs2_rgrpd **tmp;
1792 unsigned int new_space;
1793 unsigned int x;
1794
1795 if (gfs2_assert_warn(sdp, !rlist->rl_ghs))
1796 return;
1797
1798 rgd = gfs2_blk2rgrpd(sdp, block);
1799 if (!rgd) {
1800 if (gfs2_consist(sdp))
Steven Whitehouse382066d2006-05-24 10:22:09 -04001801 fs_err(sdp, "block = %llu\n", (unsigned long long)block);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001802 return;
1803 }
1804
1805 for (x = 0; x < rlist->rl_rgrps; x++)
1806 if (rlist->rl_rgd[x] == rgd)
1807 return;
1808
1809 if (rlist->rl_rgrps == rlist->rl_space) {
1810 new_space = rlist->rl_space + 10;
1811
1812 tmp = kcalloc(new_space, sizeof(struct gfs2_rgrpd *),
Steven Whitehousedd894be2006-07-27 14:29:00 -04001813 GFP_NOFS | __GFP_NOFAIL);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001814
1815 if (rlist->rl_rgd) {
1816 memcpy(tmp, rlist->rl_rgd,
1817 rlist->rl_space * sizeof(struct gfs2_rgrpd *));
1818 kfree(rlist->rl_rgd);
1819 }
1820
1821 rlist->rl_space = new_space;
1822 rlist->rl_rgd = tmp;
1823 }
1824
1825 rlist->rl_rgd[rlist->rl_rgrps++] = rgd;
1826}
1827
1828/**
1829 * gfs2_rlist_alloc - all RGs have been added to the rlist, now allocate
1830 * and initialize an array of glock holders for them
1831 * @rlist: the list of resource groups
1832 * @state: the lock state to acquire the RG lock in
1833 * @flags: the modifier flags for the holder structures
1834 *
1835 * FIXME: Don't use NOFAIL
1836 *
1837 */
1838
Bob Petersonfe6c9912008-01-28 11:13:02 -06001839void gfs2_rlist_alloc(struct gfs2_rgrp_list *rlist, unsigned int state)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001840{
1841 unsigned int x;
1842
1843 rlist->rl_ghs = kcalloc(rlist->rl_rgrps, sizeof(struct gfs2_holder),
Steven Whitehousedd894be2006-07-27 14:29:00 -04001844 GFP_NOFS | __GFP_NOFAIL);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001845 for (x = 0; x < rlist->rl_rgrps; x++)
1846 gfs2_holder_init(rlist->rl_rgd[x]->rd_gl,
Bob Petersonfe6c9912008-01-28 11:13:02 -06001847 state, 0,
David Teiglandb3b94fa2006-01-16 16:50:04 +00001848 &rlist->rl_ghs[x]);
1849}
1850
1851/**
1852 * gfs2_rlist_free - free a resource group list
1853 * @list: the list of resource groups
1854 *
1855 */
1856
1857void gfs2_rlist_free(struct gfs2_rgrp_list *rlist)
1858{
1859 unsigned int x;
1860
1861 kfree(rlist->rl_rgd);
1862
1863 if (rlist->rl_ghs) {
1864 for (x = 0; x < rlist->rl_rgrps; x++)
1865 gfs2_holder_uninit(&rlist->rl_ghs[x]);
1866 kfree(rlist->rl_ghs);
1867 }
1868}
1869