blob: 0608f490c295dae79b49cf496bffd0fa79e2c849 [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
Steven Whitehousec9e98882008-11-04 09:47:33 +0000503 if (pos + sizeof(struct gfs2_rindex) >= ip->i_disksize)
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
586static int gfs2_ri_update(struct gfs2_inode *ip)
587{
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 Whitehousec9e98882008-11-04 09:47:33 +0000591 u64 rgrp_count = ip->i_disksize;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000592 int error;
593
Robert Petersoncd81a4b2007-05-14 12:42:18 -0500594 if (do_div(rgrp_count, sizeof(struct gfs2_rindex))) {
David Teiglandb3b94fa2006-01-16 16:50:04 +0000595 gfs2_consist_inode(ip);
596 return -EIO;
597 }
598
599 clear_rgrpdi(sdp);
600
Steven Whitehousef42faf42006-01-30 18:34:10 +0000601 file_ra_state_init(&ra_state, inode->i_mapping);
Robert Petersoncd81a4b2007-05-14 12:42:18 -0500602 for (sdp->sd_rgrps = 0; sdp->sd_rgrps < rgrp_count; sdp->sd_rgrps++) {
Robert Peterson6c532672007-05-10 16:54:38 -0500603 error = read_rindex_entry(ip, &ra_state);
604 if (error) {
605 clear_rgrpdi(sdp);
606 return error;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000607 }
David Teiglandb3b94fa2006-01-16 16:50:04 +0000608 }
609
Bob Petersoncf45b752008-01-31 10:31:39 -0600610 sdp->sd_rindex_uptodate = 1;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000611 return 0;
Robert Peterson6c532672007-05-10 16:54:38 -0500612}
David Teiglandb3b94fa2006-01-16 16:50:04 +0000613
Robert Peterson6c532672007-05-10 16:54:38 -0500614/**
615 * gfs2_ri_update_special - Pull in a new resource index from the disk
616 *
617 * This is a special version that's safe to call from gfs2_inplace_reserve_i.
618 * In this case we know that we don't have any resource groups in memory yet.
619 *
620 * @ip: pointer to the rindex inode
621 *
622 * Returns: 0 on successful update, error code otherwise
623 */
624static int gfs2_ri_update_special(struct gfs2_inode *ip)
625{
626 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
627 struct inode *inode = &ip->i_inode;
628 struct file_ra_state ra_state;
629 int error;
630
631 file_ra_state_init(&ra_state, inode->i_mapping);
632 for (sdp->sd_rgrps = 0;; sdp->sd_rgrps++) {
633 /* Ignore partials */
634 if ((sdp->sd_rgrps + 1) * sizeof(struct gfs2_rindex) >
Steven Whitehousec9e98882008-11-04 09:47:33 +0000635 ip->i_disksize)
Robert Peterson6c532672007-05-10 16:54:38 -0500636 break;
637 error = read_rindex_entry(ip, &ra_state);
638 if (error) {
639 clear_rgrpdi(sdp);
640 return error;
641 }
642 }
643
Bob Petersoncf45b752008-01-31 10:31:39 -0600644 sdp->sd_rindex_uptodate = 1;
Robert Peterson6c532672007-05-10 16:54:38 -0500645 return 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000646}
647
648/**
649 * gfs2_rindex_hold - Grab a lock on the rindex
650 * @sdp: The GFS2 superblock
651 * @ri_gh: the glock holder
652 *
653 * We grab a lock on the rindex inode to make sure that it doesn't
654 * change whilst we are performing an operation. We keep this lock
655 * for quite long periods of time compared to other locks. This
656 * doesn't matter, since it is shared and it is very, very rarely
657 * accessed in the exclusive mode (i.e. only when expanding the filesystem).
658 *
659 * This makes sure that we're using the latest copy of the resource index
660 * special file, which might have been updated if someone expanded the
661 * filesystem (via gfs2_grow utility), which adds new resource groups.
662 *
663 * Returns: 0 on success, error code otherwise
664 */
665
666int gfs2_rindex_hold(struct gfs2_sbd *sdp, struct gfs2_holder *ri_gh)
667{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400668 struct gfs2_inode *ip = GFS2_I(sdp->sd_rindex);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000669 struct gfs2_glock *gl = ip->i_gl;
670 int error;
671
672 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, 0, ri_gh);
673 if (error)
674 return error;
675
676 /* Read new copy from disk if we don't have the latest */
Bob Petersoncf45b752008-01-31 10:31:39 -0600677 if (!sdp->sd_rindex_uptodate) {
Steven Whitehousef55ab262006-02-21 12:51:39 +0000678 mutex_lock(&sdp->sd_rindex_mutex);
Bob Petersoncf45b752008-01-31 10:31:39 -0600679 if (!sdp->sd_rindex_uptodate) {
David Teiglandb3b94fa2006-01-16 16:50:04 +0000680 error = gfs2_ri_update(ip);
681 if (error)
682 gfs2_glock_dq_uninit(ri_gh);
683 }
Steven Whitehousef55ab262006-02-21 12:51:39 +0000684 mutex_unlock(&sdp->sd_rindex_mutex);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000685 }
686
687 return error;
688}
689
Bob Peterson42d52e32008-01-28 18:38:07 -0600690static void gfs2_rgrp_in(struct gfs2_rgrpd *rgd, const void *buf)
Steven Whitehousebb8d8a62007-06-01 14:11:58 +0100691{
692 const struct gfs2_rgrp *str = buf;
Bob Peterson42d52e32008-01-28 18:38:07 -0600693 u32 rg_flags;
Steven Whitehousebb8d8a62007-06-01 14:11:58 +0100694
Bob Peterson42d52e32008-01-28 18:38:07 -0600695 rg_flags = be32_to_cpu(str->rg_flags);
Steven Whitehouse09010972009-05-20 10:48:47 +0100696 rg_flags &= ~GFS2_RDF_MASK;
Steven Whitehouse1ce97e52009-05-21 15:18:19 +0100697 rgd->rd_flags &= GFS2_RDF_MASK;
698 rgd->rd_flags |= rg_flags;
Steven Whitehousecfc8b542008-11-04 10:25:13 +0000699 rgd->rd_free = be32_to_cpu(str->rg_free);
Steven Whitehouse73f74942008-11-04 10:32:57 +0000700 rgd->rd_dinodes = be32_to_cpu(str->rg_dinodes);
Steven Whitehoused8b71f72008-11-04 10:19:03 +0000701 rgd->rd_igeneration = be64_to_cpu(str->rg_igeneration);
Steven Whitehousebb8d8a62007-06-01 14:11:58 +0100702}
703
Bob Peterson42d52e32008-01-28 18:38:07 -0600704static void gfs2_rgrp_out(struct gfs2_rgrpd *rgd, void *buf)
Steven Whitehousebb8d8a62007-06-01 14:11:58 +0100705{
706 struct gfs2_rgrp *str = buf;
707
Steven Whitehouse09010972009-05-20 10:48:47 +0100708 str->rg_flags = cpu_to_be32(rgd->rd_flags & ~GFS2_RDF_MASK);
Steven Whitehousecfc8b542008-11-04 10:25:13 +0000709 str->rg_free = cpu_to_be32(rgd->rd_free);
Steven Whitehouse73f74942008-11-04 10:32:57 +0000710 str->rg_dinodes = cpu_to_be32(rgd->rd_dinodes);
Steven Whitehousebb8d8a62007-06-01 14:11:58 +0100711 str->__pad = cpu_to_be32(0);
Steven Whitehoused8b71f72008-11-04 10:19:03 +0000712 str->rg_igeneration = cpu_to_be64(rgd->rd_igeneration);
Steven Whitehousebb8d8a62007-06-01 14:11:58 +0100713 memset(&str->rg_reserved, 0, sizeof(str->rg_reserved));
714}
715
David Teiglandb3b94fa2006-01-16 16:50:04 +0000716/**
717 * gfs2_rgrp_bh_get - Read in a RG's header and bitmaps
718 * @rgd: the struct gfs2_rgrpd describing the RG to read in
719 *
720 * Read in all of a Resource Group's header and bitmap blocks.
721 * Caller must eventually call gfs2_rgrp_relse() to free the bitmaps.
722 *
723 * Returns: errno
724 */
725
726int gfs2_rgrp_bh_get(struct gfs2_rgrpd *rgd)
727{
728 struct gfs2_sbd *sdp = rgd->rd_sbd;
729 struct gfs2_glock *gl = rgd->rd_gl;
Steven Whitehousebb8d8a62007-06-01 14:11:58 +0100730 unsigned int length = rgd->rd_length;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000731 struct gfs2_bitmap *bi;
732 unsigned int x, y;
733 int error;
734
Steven Whitehousef55ab262006-02-21 12:51:39 +0000735 mutex_lock(&rgd->rd_mutex);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000736
737 spin_lock(&sdp->sd_rindex_spin);
738 if (rgd->rd_bh_count) {
739 rgd->rd_bh_count++;
740 spin_unlock(&sdp->sd_rindex_spin);
Steven Whitehousef55ab262006-02-21 12:51:39 +0000741 mutex_unlock(&rgd->rd_mutex);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000742 return 0;
743 }
744 spin_unlock(&sdp->sd_rindex_spin);
745
746 for (x = 0; x < length; x++) {
747 bi = rgd->rd_bits + x;
Steven Whitehousebb8d8a62007-06-01 14:11:58 +0100748 error = gfs2_meta_read(gl, rgd->rd_addr + x, 0, &bi->bi_bh);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000749 if (error)
750 goto fail;
751 }
752
753 for (y = length; y--;) {
754 bi = rgd->rd_bits + y;
Steven Whitehouse7276b3b2006-09-21 17:05:23 -0400755 error = gfs2_meta_wait(sdp, bi->bi_bh);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000756 if (error)
757 goto fail;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400758 if (gfs2_metatype_check(sdp, bi->bi_bh, y ? GFS2_METATYPE_RB :
David Teiglandb3b94fa2006-01-16 16:50:04 +0000759 GFS2_METATYPE_RG)) {
760 error = -EIO;
761 goto fail;
762 }
763 }
764
Bob Petersoncf45b752008-01-31 10:31:39 -0600765 if (!(rgd->rd_flags & GFS2_RDF_UPTODATE)) {
Steven Whitehouse60a0b8f2009-05-21 12:23:12 +0100766 for (x = 0; x < length; x++)
767 clear_bit(GBF_FULL, &rgd->rd_bits[x].bi_flags);
Bob Peterson42d52e32008-01-28 18:38:07 -0600768 gfs2_rgrp_in(rgd, (rgd->rd_bits[0].bi_bh)->b_data);
Steven Whitehouse1ce97e52009-05-21 15:18:19 +0100769 rgd->rd_flags |= (GFS2_RDF_UPTODATE | GFS2_RDF_CHECK);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000770 }
771
772 spin_lock(&sdp->sd_rindex_spin);
Steven Whitehousecfc8b542008-11-04 10:25:13 +0000773 rgd->rd_free_clone = rgd->rd_free;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000774 rgd->rd_bh_count++;
775 spin_unlock(&sdp->sd_rindex_spin);
776
Steven Whitehousef55ab262006-02-21 12:51:39 +0000777 mutex_unlock(&rgd->rd_mutex);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000778
779 return 0;
780
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400781fail:
David Teiglandb3b94fa2006-01-16 16:50:04 +0000782 while (x--) {
783 bi = rgd->rd_bits + x;
784 brelse(bi->bi_bh);
785 bi->bi_bh = NULL;
786 gfs2_assert_warn(sdp, !bi->bi_clone);
787 }
Steven Whitehousef55ab262006-02-21 12:51:39 +0000788 mutex_unlock(&rgd->rd_mutex);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000789
790 return error;
791}
792
793void gfs2_rgrp_bh_hold(struct gfs2_rgrpd *rgd)
794{
795 struct gfs2_sbd *sdp = rgd->rd_sbd;
796
797 spin_lock(&sdp->sd_rindex_spin);
798 gfs2_assert_warn(rgd->rd_sbd, rgd->rd_bh_count);
799 rgd->rd_bh_count++;
800 spin_unlock(&sdp->sd_rindex_spin);
801}
802
803/**
804 * gfs2_rgrp_bh_put - Release RG bitmaps read in with gfs2_rgrp_bh_get()
805 * @rgd: the struct gfs2_rgrpd describing the RG to read in
806 *
807 */
808
809void gfs2_rgrp_bh_put(struct gfs2_rgrpd *rgd)
810{
811 struct gfs2_sbd *sdp = rgd->rd_sbd;
Steven Whitehousebb8d8a62007-06-01 14:11:58 +0100812 int x, length = rgd->rd_length;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000813
814 spin_lock(&sdp->sd_rindex_spin);
815 gfs2_assert_warn(rgd->rd_sbd, rgd->rd_bh_count);
816 if (--rgd->rd_bh_count) {
817 spin_unlock(&sdp->sd_rindex_spin);
818 return;
819 }
820
821 for (x = 0; x < length; x++) {
822 struct gfs2_bitmap *bi = rgd->rd_bits + x;
823 kfree(bi->bi_clone);
824 bi->bi_clone = NULL;
825 brelse(bi->bi_bh);
826 bi->bi_bh = NULL;
827 }
828
829 spin_unlock(&sdp->sd_rindex_spin);
830}
831
Steven Whitehousef15ab562009-02-09 09:25:01 +0000832static void gfs2_rgrp_send_discards(struct gfs2_sbd *sdp, u64 offset,
833 const struct gfs2_bitmap *bi)
834{
835 struct super_block *sb = sdp->sd_vfs;
836 struct block_device *bdev = sb->s_bdev;
837 const unsigned int sects_per_blk = sdp->sd_sb.sb_bsize /
Martin K. Petersene1defc42009-05-22 17:17:49 -0400838 bdev_logical_block_size(sb->s_bdev);
Steven Whitehousef15ab562009-02-09 09:25:01 +0000839 u64 blk;
Steven Whitehouse64d576b2009-02-12 13:31:58 +0000840 sector_t start = 0;
Steven Whitehousef15ab562009-02-09 09:25:01 +0000841 sector_t nr_sects = 0;
842 int rv;
843 unsigned int x;
844
845 for (x = 0; x < bi->bi_len; x++) {
846 const u8 *orig = bi->bi_bh->b_data + bi->bi_offset + x;
847 const u8 *clone = bi->bi_clone + bi->bi_offset + x;
848 u8 diff = ~(*orig | (*orig >> 1)) & (*clone | (*clone >> 1));
849 diff &= 0x55;
850 if (diff == 0)
851 continue;
852 blk = offset + ((bi->bi_start + x) * GFS2_NBBY);
853 blk *= sects_per_blk; /* convert to sectors */
854 while(diff) {
855 if (diff & 1) {
856 if (nr_sects == 0)
857 goto start_new_extent;
858 if ((start + nr_sects) != blk) {
859 rv = blkdev_issue_discard(bdev, start,
Christoph Hellwig746cd1e2009-09-12 07:35:43 +0200860 nr_sects, GFP_NOFS,
861 DISCARD_FL_BARRIER);
Steven Whitehousef15ab562009-02-09 09:25:01 +0000862 if (rv)
863 goto fail;
864 nr_sects = 0;
865start_new_extent:
866 start = blk;
867 }
868 nr_sects += sects_per_blk;
869 }
870 diff >>= 2;
871 blk += sects_per_blk;
872 }
873 }
874 if (nr_sects) {
Christoph Hellwig746cd1e2009-09-12 07:35:43 +0200875 rv = blkdev_issue_discard(bdev, start, nr_sects, GFP_NOFS,
876 DISCARD_FL_BARRIER);
Steven Whitehousef15ab562009-02-09 09:25:01 +0000877 if (rv)
878 goto fail;
879 }
880 return;
881fail:
882 fs_warn(sdp, "error %d on discard request, turning discards off for this filesystem", rv);
883 sdp->sd_args.ar_discard = 0;
884}
885
David Teiglandb3b94fa2006-01-16 16:50:04 +0000886void gfs2_rgrp_repolish_clones(struct gfs2_rgrpd *rgd)
887{
888 struct gfs2_sbd *sdp = rgd->rd_sbd;
Steven Whitehousebb8d8a62007-06-01 14:11:58 +0100889 unsigned int length = rgd->rd_length;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000890 unsigned int x;
891
892 for (x = 0; x < length; x++) {
893 struct gfs2_bitmap *bi = rgd->rd_bits + x;
894 if (!bi->bi_clone)
895 continue;
Steven Whitehousef15ab562009-02-09 09:25:01 +0000896 if (sdp->sd_args.ar_discard)
897 gfs2_rgrp_send_discards(sdp, rgd->rd_data0, bi);
Steven Whitehouse60a0b8f2009-05-21 12:23:12 +0100898 clear_bit(GBF_FULL, &bi->bi_flags);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000899 memcpy(bi->bi_clone + bi->bi_offset,
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400900 bi->bi_bh->b_data + bi->bi_offset, bi->bi_len);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000901 }
902
903 spin_lock(&sdp->sd_rindex_spin);
Steven Whitehousecfc8b542008-11-04 10:25:13 +0000904 rgd->rd_free_clone = rgd->rd_free;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000905 spin_unlock(&sdp->sd_rindex_spin);
906}
907
908/**
909 * gfs2_alloc_get - get the struct gfs2_alloc structure for an inode
910 * @ip: the incore GFS2 inode structure
911 *
912 * Returns: the struct gfs2_alloc
913 */
914
915struct gfs2_alloc *gfs2_alloc_get(struct gfs2_inode *ip)
916{
Steven Whitehouse6dbd8222008-01-10 15:18:55 +0000917 BUG_ON(ip->i_alloc != NULL);
918 ip->i_alloc = kzalloc(sizeof(struct gfs2_alloc), GFP_KERNEL);
919 return ip->i_alloc;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000920}
921
922/**
David Teiglandb3b94fa2006-01-16 16:50:04 +0000923 * try_rgrp_fit - See if a given reservation will fit in a given RG
924 * @rgd: the RG data
925 * @al: the struct gfs2_alloc structure describing the reservation
926 *
927 * If there's room for the requested blocks to be allocated from the RG:
David Teiglandb3b94fa2006-01-16 16:50:04 +0000928 * Sets the $al_rgd field in @al.
929 *
930 * Returns: 1 on success (it fits), 0 on failure (it doesn't fit)
931 */
932
933static int try_rgrp_fit(struct gfs2_rgrpd *rgd, struct gfs2_alloc *al)
934{
935 struct gfs2_sbd *sdp = rgd->rd_sbd;
936 int ret = 0;
937
Steven Whitehouse09010972009-05-20 10:48:47 +0100938 if (rgd->rd_flags & (GFS2_RGF_NOALLOC | GFS2_RDF_ERROR))
Steven Whitehousea43a4902007-04-02 10:48:17 +0100939 return 0;
940
David Teiglandb3b94fa2006-01-16 16:50:04 +0000941 spin_lock(&sdp->sd_rindex_spin);
942 if (rgd->rd_free_clone >= al->al_requested) {
943 al->al_rgd = rgd;
944 ret = 1;
945 }
946 spin_unlock(&sdp->sd_rindex_spin);
947
948 return ret;
949}
950
951/**
Steven Whitehousec8cdf472007-06-08 10:05:33 +0100952 * try_rgrp_unlink - Look for any unlinked, allocated, but unused inodes
953 * @rgd: The rgrp
954 *
955 * Returns: The inode, if one has been found
956 */
957
Steven Whitehouse1e19a192009-07-10 21:13:38 +0100958static struct inode *try_rgrp_unlink(struct gfs2_rgrpd *rgd, u64 *last_unlinked,
959 u64 skip)
Steven Whitehousec8cdf472007-06-08 10:05:33 +0100960{
961 struct inode *inode;
Bob Peterson6760bdc2007-07-24 14:09:32 -0500962 u32 goal = 0, block;
Wendy Chengbb9bcf02007-06-27 17:07:08 -0400963 u64 no_addr;
Bob Peterson5f3eae72007-08-08 16:52:09 -0500964 struct gfs2_sbd *sdp = rgd->rd_sbd;
Steven Whitehouseb45e41d2008-02-06 10:11:15 +0000965 unsigned int n;
Steven Whitehousec8cdf472007-06-08 10:05:33 +0100966
967 for(;;) {
Bob Peterson24c73872007-07-12 16:58:50 -0500968 if (goal >= rgd->rd_data)
969 break;
Bob Peterson5f3eae72007-08-08 16:52:09 -0500970 down_write(&sdp->sd_log_flush_lock);
Steven Whitehouseb45e41d2008-02-06 10:11:15 +0000971 n = 1;
Bob Peterson6760bdc2007-07-24 14:09:32 -0500972 block = rgblk_search(rgd, goal, GFS2_BLKST_UNLINKED,
Steven Whitehouseb45e41d2008-02-06 10:11:15 +0000973 GFS2_BLKST_UNLINKED, &n);
Bob Peterson5f3eae72007-08-08 16:52:09 -0500974 up_write(&sdp->sd_log_flush_lock);
Bob Peterson6760bdc2007-07-24 14:09:32 -0500975 if (block == BFITNOENT)
Bob Peterson24c73872007-07-12 16:58:50 -0500976 break;
Bob Peterson6760bdc2007-07-24 14:09:32 -0500977 /* rgblk_search can return a block < goal, so we need to
978 keep it marching forward. */
979 no_addr = block + rgd->rd_data0;
Bob Peterson24c73872007-07-12 16:58:50 -0500980 goal++;
Bob Peterson6760bdc2007-07-24 14:09:32 -0500981 if (*last_unlinked != NO_BLOCK && no_addr <= *last_unlinked)
Steven Whitehousec8cdf472007-06-08 10:05:33 +0100982 continue;
Steven Whitehouse1e19a192009-07-10 21:13:38 +0100983 if (no_addr == skip)
984 continue;
Wendy Chengbb9bcf02007-06-27 17:07:08 -0400985 *last_unlinked = no_addr;
986 inode = gfs2_inode_lookup(rgd->rd_sbd->sd_vfs, DT_UNKNOWN,
Benjamin Marzinski7a9f53b2007-09-18 13:33:18 -0500987 no_addr, -1, 1);
Steven Whitehousec8cdf472007-06-08 10:05:33 +0100988 if (!IS_ERR(inode))
989 return inode;
990 }
991
992 rgd->rd_flags &= ~GFS2_RDF_CHECK;
993 return NULL;
994}
995
996/**
David Teiglandb3b94fa2006-01-16 16:50:04 +0000997 * recent_rgrp_next - get next RG from "recent" list
998 * @cur_rgd: current rgrp
David Teiglandb3b94fa2006-01-16 16:50:04 +0000999 *
1000 * Returns: The next rgrp in the recent list
1001 */
1002
Steven Whitehouse9cabcdb2008-07-10 15:54:12 +01001003static struct gfs2_rgrpd *recent_rgrp_next(struct gfs2_rgrpd *cur_rgd)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001004{
1005 struct gfs2_sbd *sdp = cur_rgd->rd_sbd;
1006 struct list_head *head;
1007 struct gfs2_rgrpd *rgd;
1008
1009 spin_lock(&sdp->sd_rindex_spin);
Steven Whitehouse9cabcdb2008-07-10 15:54:12 +01001010 head = &sdp->sd_rindex_mru_list;
1011 if (unlikely(cur_rgd->rd_list_mru.next == head)) {
1012 spin_unlock(&sdp->sd_rindex_spin);
1013 return NULL;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001014 }
Steven Whitehouse9cabcdb2008-07-10 15:54:12 +01001015 rgd = list_entry(cur_rgd->rd_list_mru.next, struct gfs2_rgrpd, rd_list_mru);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001016 spin_unlock(&sdp->sd_rindex_spin);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001017 return rgd;
1018}
1019
1020/**
David Teiglandb3b94fa2006-01-16 16:50:04 +00001021 * forward_rgrp_get - get an rgrp to try next from full list
1022 * @sdp: The GFS2 superblock
1023 *
1024 * Returns: The rgrp to try next
1025 */
1026
1027static struct gfs2_rgrpd *forward_rgrp_get(struct gfs2_sbd *sdp)
1028{
1029 struct gfs2_rgrpd *rgd;
1030 unsigned int journals = gfs2_jindex_size(sdp);
1031 unsigned int rg = 0, x;
1032
1033 spin_lock(&sdp->sd_rindex_spin);
1034
1035 rgd = sdp->sd_rindex_forward;
1036 if (!rgd) {
1037 if (sdp->sd_rgrps >= journals)
1038 rg = sdp->sd_rgrps * sdp->sd_jdesc->jd_jid / journals;
1039
Steven Whitehouseb8e1aab2006-08-22 16:25:50 -04001040 for (x = 0, rgd = gfs2_rgrpd_get_first(sdp); x < rg;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001041 x++, rgd = gfs2_rgrpd_get_next(rgd))
1042 /* Do Nothing */;
1043
1044 sdp->sd_rindex_forward = rgd;
1045 }
1046
1047 spin_unlock(&sdp->sd_rindex_spin);
1048
1049 return rgd;
1050}
1051
1052/**
1053 * forward_rgrp_set - set the forward rgrp pointer
1054 * @sdp: the filesystem
1055 * @rgd: The new forward rgrp
1056 *
1057 */
1058
1059static void forward_rgrp_set(struct gfs2_sbd *sdp, struct gfs2_rgrpd *rgd)
1060{
1061 spin_lock(&sdp->sd_rindex_spin);
1062 sdp->sd_rindex_forward = rgd;
1063 spin_unlock(&sdp->sd_rindex_spin);
1064}
1065
1066/**
1067 * get_local_rgrp - Choose and lock a rgrp for allocation
1068 * @ip: the inode to reserve space for
1069 * @rgp: the chosen and locked rgrp
1070 *
1071 * Try to acquire rgrp in way which avoids contending with others.
1072 *
1073 * Returns: errno
1074 */
1075
Steven Whitehousec8cdf472007-06-08 10:05:33 +01001076static struct inode *get_local_rgrp(struct gfs2_inode *ip, u64 *last_unlinked)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001077{
Steven Whitehousec8cdf472007-06-08 10:05:33 +01001078 struct inode *inode = NULL;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001079 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001080 struct gfs2_rgrpd *rgd, *begin = NULL;
Steven Whitehouse6dbd8222008-01-10 15:18:55 +00001081 struct gfs2_alloc *al = ip->i_alloc;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001082 int flags = LM_FLAG_TRY;
1083 int skipped = 0;
1084 int loops = 0;
Abhijith Das292c8c12007-11-29 14:13:54 -06001085 int error, rg_locked;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001086
Steven Whitehouse9cabcdb2008-07-10 15:54:12 +01001087 rgd = gfs2_blk2rgrpd(sdp, ip->i_goal);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001088
1089 while (rgd) {
Abhijith Das292c8c12007-11-29 14:13:54 -06001090 rg_locked = 0;
1091
1092 if (gfs2_glock_is_locked_by_me(rgd->rd_gl)) {
1093 rg_locked = 1;
1094 error = 0;
1095 } else {
1096 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE,
1097 LM_FLAG_TRY, &al->al_rgd_gh);
1098 }
David Teiglandb3b94fa2006-01-16 16:50:04 +00001099 switch (error) {
1100 case 0:
1101 if (try_rgrp_fit(rgd, al))
1102 goto out;
Steven Whitehousec8cdf472007-06-08 10:05:33 +01001103 if (rgd->rd_flags & GFS2_RDF_CHECK)
Steven Whitehouse1e19a192009-07-10 21:13:38 +01001104 inode = try_rgrp_unlink(rgd, last_unlinked, ip->i_no_addr);
Abhijith Das292c8c12007-11-29 14:13:54 -06001105 if (!rg_locked)
1106 gfs2_glock_dq_uninit(&al->al_rgd_gh);
Steven Whitehousec8cdf472007-06-08 10:05:33 +01001107 if (inode)
1108 return inode;
Steven Whitehouse9cabcdb2008-07-10 15:54:12 +01001109 /* fall through */
David Teiglandb3b94fa2006-01-16 16:50:04 +00001110 case GLR_TRYFAILED:
Steven Whitehouse9cabcdb2008-07-10 15:54:12 +01001111 rgd = recent_rgrp_next(rgd);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001112 break;
1113
1114 default:
Steven Whitehousec8cdf472007-06-08 10:05:33 +01001115 return ERR_PTR(error);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001116 }
1117 }
1118
1119 /* Go through full list of rgrps */
1120
1121 begin = rgd = forward_rgrp_get(sdp);
1122
1123 for (;;) {
Abhijith Das292c8c12007-11-29 14:13:54 -06001124 rg_locked = 0;
1125
1126 if (gfs2_glock_is_locked_by_me(rgd->rd_gl)) {
1127 rg_locked = 1;
1128 error = 0;
1129 } else {
1130 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, flags,
1131 &al->al_rgd_gh);
1132 }
David Teiglandb3b94fa2006-01-16 16:50:04 +00001133 switch (error) {
1134 case 0:
1135 if (try_rgrp_fit(rgd, al))
1136 goto out;
Steven Whitehousec8cdf472007-06-08 10:05:33 +01001137 if (rgd->rd_flags & GFS2_RDF_CHECK)
Steven Whitehouse1e19a192009-07-10 21:13:38 +01001138 inode = try_rgrp_unlink(rgd, last_unlinked, ip->i_no_addr);
Abhijith Das292c8c12007-11-29 14:13:54 -06001139 if (!rg_locked)
1140 gfs2_glock_dq_uninit(&al->al_rgd_gh);
Steven Whitehousec8cdf472007-06-08 10:05:33 +01001141 if (inode)
1142 return inode;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001143 break;
1144
1145 case GLR_TRYFAILED:
1146 skipped++;
1147 break;
1148
1149 default:
Steven Whitehousec8cdf472007-06-08 10:05:33 +01001150 return ERR_PTR(error);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001151 }
1152
1153 rgd = gfs2_rgrpd_get_next(rgd);
1154 if (!rgd)
1155 rgd = gfs2_rgrpd_get_first(sdp);
1156
1157 if (rgd == begin) {
Benjamin Marzinski172e0452007-03-23 14:51:56 -06001158 if (++loops >= 3)
Steven Whitehousec8cdf472007-06-08 10:05:33 +01001159 return ERR_PTR(-ENOSPC);
Benjamin Marzinski172e0452007-03-23 14:51:56 -06001160 if (!skipped)
1161 loops++;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001162 flags = 0;
Benjamin Marzinski172e0452007-03-23 14:51:56 -06001163 if (loops == 2)
1164 gfs2_log_flush(sdp, NULL);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001165 }
1166 }
1167
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001168out:
David Teiglandb3b94fa2006-01-16 16:50:04 +00001169 if (begin) {
Steven Whitehouse9cabcdb2008-07-10 15:54:12 +01001170 spin_lock(&sdp->sd_rindex_spin);
1171 list_move(&rgd->rd_list_mru, &sdp->sd_rindex_mru_list);
1172 spin_unlock(&sdp->sd_rindex_spin);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001173 rgd = gfs2_rgrpd_get_next(rgd);
1174 if (!rgd)
1175 rgd = gfs2_rgrpd_get_first(sdp);
1176 forward_rgrp_set(sdp, rgd);
1177 }
1178
Steven Whitehousec8cdf472007-06-08 10:05:33 +01001179 return NULL;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001180}
1181
1182/**
1183 * gfs2_inplace_reserve_i - Reserve space in the filesystem
1184 * @ip: the inode to reserve space for
1185 *
1186 * Returns: errno
1187 */
1188
1189int gfs2_inplace_reserve_i(struct gfs2_inode *ip, char *file, unsigned int line)
1190{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001191 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
Steven Whitehouse6dbd8222008-01-10 15:18:55 +00001192 struct gfs2_alloc *al = ip->i_alloc;
Steven Whitehousec8cdf472007-06-08 10:05:33 +01001193 struct inode *inode;
Robert Peterson7ae8fa82007-05-09 09:37:57 -05001194 int error = 0;
Bob Peterson6760bdc2007-07-24 14:09:32 -05001195 u64 last_unlinked = NO_BLOCK;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001196
1197 if (gfs2_assert_warn(sdp, al->al_requested))
1198 return -EINVAL;
1199
Steven Whitehousec8cdf472007-06-08 10:05:33 +01001200try_again:
Robert Peterson7ae8fa82007-05-09 09:37:57 -05001201 /* We need to hold the rindex unless the inode we're using is
1202 the rindex itself, in which case it's already held. */
1203 if (ip != GFS2_I(sdp->sd_rindex))
1204 error = gfs2_rindex_hold(sdp, &al->al_ri_gh);
1205 else if (!sdp->sd_rgrps) /* We may not have the rindex read in, so: */
Robert Peterson6c532672007-05-10 16:54:38 -05001206 error = gfs2_ri_update_special(ip);
Robert Peterson7ae8fa82007-05-09 09:37:57 -05001207
David Teiglandb3b94fa2006-01-16 16:50:04 +00001208 if (error)
1209 return error;
1210
Steven Whitehousec8cdf472007-06-08 10:05:33 +01001211 inode = get_local_rgrp(ip, &last_unlinked);
1212 if (inode) {
Robert Peterson7ae8fa82007-05-09 09:37:57 -05001213 if (ip != GFS2_I(sdp->sd_rindex))
1214 gfs2_glock_dq_uninit(&al->al_ri_gh);
Steven Whitehousec8cdf472007-06-08 10:05:33 +01001215 if (IS_ERR(inode))
1216 return PTR_ERR(inode);
1217 iput(inode);
1218 gfs2_log_flush(sdp, NULL);
1219 goto try_again;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001220 }
1221
1222 al->al_file = file;
1223 al->al_line = line;
1224
1225 return 0;
1226}
1227
1228/**
1229 * gfs2_inplace_release - release an inplace reservation
1230 * @ip: the inode the reservation was taken out on
1231 *
1232 * Release a reservation made by gfs2_inplace_reserve().
1233 */
1234
1235void gfs2_inplace_release(struct gfs2_inode *ip)
1236{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001237 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
Steven Whitehouse6dbd8222008-01-10 15:18:55 +00001238 struct gfs2_alloc *al = ip->i_alloc;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001239
1240 if (gfs2_assert_warn(sdp, al->al_alloced <= al->al_requested) == -1)
1241 fs_warn(sdp, "al_alloced = %u, al_requested = %u "
1242 "al_file = %s, al_line = %u\n",
1243 al->al_alloced, al->al_requested, al->al_file,
1244 al->al_line);
1245
1246 al->al_rgd = NULL;
Abhijith Das292c8c12007-11-29 14:13:54 -06001247 if (al->al_rgd_gh.gh_gl)
1248 gfs2_glock_dq_uninit(&al->al_rgd_gh);
Robert Peterson7ae8fa82007-05-09 09:37:57 -05001249 if (ip != GFS2_I(sdp->sd_rindex))
1250 gfs2_glock_dq_uninit(&al->al_ri_gh);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001251}
1252
1253/**
1254 * gfs2_get_block_type - Check a block in a RG is of given type
1255 * @rgd: the resource group holding the block
1256 * @block: the block number
1257 *
1258 * Returns: The block type (GFS2_BLKST_*)
1259 */
1260
Steven Whitehouseacf7e242009-09-08 18:00:30 +01001261static unsigned char gfs2_get_block_type(struct gfs2_rgrpd *rgd, u64 block)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001262{
1263 struct gfs2_bitmap *bi = NULL;
Steven Whitehousecd915492006-09-04 12:49:07 -04001264 u32 length, rgrp_block, buf_block;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001265 unsigned int buf;
1266 unsigned char type;
1267
Steven Whitehousebb8d8a62007-06-01 14:11:58 +01001268 length = rgd->rd_length;
1269 rgrp_block = block - rgd->rd_data0;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001270
1271 for (buf = 0; buf < length; buf++) {
1272 bi = rgd->rd_bits + buf;
1273 if (rgrp_block < (bi->bi_start + bi->bi_len) * GFS2_NBBY)
1274 break;
1275 }
1276
1277 gfs2_assert(rgd->rd_sbd, buf < length);
1278 buf_block = rgrp_block - bi->bi_start * GFS2_NBBY;
1279
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001280 type = gfs2_testbit(rgd, bi->bi_bh->b_data + bi->bi_offset,
David Teiglandb3b94fa2006-01-16 16:50:04 +00001281 bi->bi_len, buf_block);
1282
1283 return type;
1284}
1285
1286/**
1287 * rgblk_search - find a block in @old_state, change allocation
1288 * state to @new_state
1289 * @rgd: the resource group descriptor
1290 * @goal: the goal block within the RG (start here to search for avail block)
1291 * @old_state: GFS2_BLKST_XXX the before-allocation state to find
1292 * @new_state: GFS2_BLKST_XXX the after-allocation block state
Steven Whitehouseb45e41d2008-02-06 10:11:15 +00001293 * @n: The extent length
David Teiglandb3b94fa2006-01-16 16:50:04 +00001294 *
1295 * Walk rgrp's bitmap to find bits that represent a block in @old_state.
1296 * Add the found bitmap buffer to the transaction.
1297 * Set the found bits to @new_state to change block's allocation state.
1298 *
1299 * This function never fails, because we wouldn't call it unless we
1300 * know (from reservation results, etc.) that a block is available.
1301 *
1302 * Scope of @goal and returned block is just within rgrp, not the whole
1303 * filesystem.
1304 *
1305 * Returns: the block number allocated
1306 */
1307
Steven Whitehousecd915492006-09-04 12:49:07 -04001308static u32 rgblk_search(struct gfs2_rgrpd *rgd, u32 goal,
Steven Whitehouseb45e41d2008-02-06 10:11:15 +00001309 unsigned char old_state, unsigned char new_state,
1310 unsigned int *n)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001311{
1312 struct gfs2_bitmap *bi = NULL;
Steven Whitehouseb45e41d2008-02-06 10:11:15 +00001313 const u32 length = rgd->rd_length;
Steven Whitehouse60a0b8f2009-05-21 12:23:12 +01001314 u32 blk = BFITNOENT;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001315 unsigned int buf, x;
Steven Whitehouseb45e41d2008-02-06 10:11:15 +00001316 const unsigned int elen = *n;
Steven Whitehouse60a0b8f2009-05-21 12:23:12 +01001317 const u8 *buffer = NULL;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001318
Steven Whitehouseb45e41d2008-02-06 10:11:15 +00001319 *n = 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001320 /* Find bitmap block that contains bits for goal block */
1321 for (buf = 0; buf < length; buf++) {
1322 bi = rgd->rd_bits + buf;
Steven Whitehouse60a0b8f2009-05-21 12:23:12 +01001323 /* Convert scope of "goal" from rgrp-wide to within found bit block */
1324 if (goal < (bi->bi_start + bi->bi_len) * GFS2_NBBY) {
1325 goal -= bi->bi_start * GFS2_NBBY;
1326 goto do_search;
1327 }
David Teiglandb3b94fa2006-01-16 16:50:04 +00001328 }
Steven Whitehouse60a0b8f2009-05-21 12:23:12 +01001329 buf = 0;
1330 goal = 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001331
Steven Whitehouse60a0b8f2009-05-21 12:23:12 +01001332do_search:
David Teiglandb3b94fa2006-01-16 16:50:04 +00001333 /* Search (up to entire) bitmap in this rgrp for allocatable block.
1334 "x <= length", instead of "x < length", because we typically start
1335 the search in the middle of a bit block, but if we can't find an
1336 allocatable block anywhere else, we want to be able wrap around and
1337 search in the first part of our first-searched bit block. */
1338 for (x = 0; x <= length; x++) {
Steven Whitehouse60a0b8f2009-05-21 12:23:12 +01001339 bi = rgd->rd_bits + buf;
1340
1341 if (test_bit(GBF_FULL, &bi->bi_flags) &&
1342 (old_state == GFS2_BLKST_FREE))
1343 goto skip;
1344
Bob Peterson5f3eae72007-08-08 16:52:09 -05001345 /* The GFS2_BLKST_UNLINKED state doesn't apply to the clone
1346 bitmaps, so we must search the originals for that. */
Steven Whitehouseb45e41d2008-02-06 10:11:15 +00001347 buffer = bi->bi_bh->b_data + bi->bi_offset;
Bob Peterson5f3eae72007-08-08 16:52:09 -05001348 if (old_state != GFS2_BLKST_UNLINKED && bi->bi_clone)
Steven Whitehouse110acf32008-01-29 13:30:20 +00001349 buffer = bi->bi_clone + bi->bi_offset;
1350
1351 blk = gfs2_bitfit(buffer, bi->bi_len, goal, old_state);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001352 if (blk != BFITNOENT)
1353 break;
1354
Steven Whitehouse60a0b8f2009-05-21 12:23:12 +01001355 if ((goal == 0) && (old_state == GFS2_BLKST_FREE))
1356 set_bit(GBF_FULL, &bi->bi_flags);
1357
David Teiglandb3b94fa2006-01-16 16:50:04 +00001358 /* Try next bitmap block (wrap back to rgrp header if at end) */
Steven Whitehouse60a0b8f2009-05-21 12:23:12 +01001359skip:
1360 buf++;
1361 buf %= length;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001362 goal = 0;
1363 }
1364
Steven Whitehouse60a0b8f2009-05-21 12:23:12 +01001365 if (blk == BFITNOENT)
1366 return blk;
1367 *n = 1;
1368 if (old_state == new_state)
1369 goto out;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001370
Steven Whitehouse60a0b8f2009-05-21 12:23:12 +01001371 gfs2_trans_add_bh(rgd->rd_gl, bi->bi_bh, 1);
1372 gfs2_setbit(rgd, bi->bi_bh->b_data, bi->bi_clone, bi->bi_offset,
1373 bi->bi_len, blk, new_state);
1374 goal = blk;
1375 while (*n < elen) {
1376 goal++;
1377 if (goal >= (bi->bi_len * GFS2_NBBY))
1378 break;
1379 if (gfs2_testbit(rgd, buffer, bi->bi_len, goal) !=
1380 GFS2_BLKST_FREE)
1381 break;
1382 gfs2_setbit(rgd, bi->bi_bh->b_data, bi->bi_clone, bi->bi_offset,
1383 bi->bi_len, goal, new_state);
1384 (*n)++;
1385 }
1386out:
1387 return (bi->bi_start * GFS2_NBBY) + blk;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001388}
1389
1390/**
1391 * rgblk_free - Change alloc state of given block(s)
1392 * @sdp: the filesystem
1393 * @bstart: the start of a run of blocks to free
1394 * @blen: the length of the block run (all must lie within ONE RG!)
1395 * @new_state: GFS2_BLKST_XXX the after-allocation block state
1396 *
1397 * Returns: Resource group containing the block(s)
1398 */
1399
Steven Whitehousecd915492006-09-04 12:49:07 -04001400static struct gfs2_rgrpd *rgblk_free(struct gfs2_sbd *sdp, u64 bstart,
1401 u32 blen, unsigned char new_state)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001402{
1403 struct gfs2_rgrpd *rgd;
1404 struct gfs2_bitmap *bi = NULL;
Steven Whitehousecd915492006-09-04 12:49:07 -04001405 u32 length, rgrp_blk, buf_blk;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001406 unsigned int buf;
1407
1408 rgd = gfs2_blk2rgrpd(sdp, bstart);
1409 if (!rgd) {
1410 if (gfs2_consist(sdp))
Steven Whitehouse382066d2006-05-24 10:22:09 -04001411 fs_err(sdp, "block = %llu\n", (unsigned long long)bstart);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001412 return NULL;
1413 }
1414
Steven Whitehousebb8d8a62007-06-01 14:11:58 +01001415 length = rgd->rd_length;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001416
Steven Whitehousebb8d8a62007-06-01 14:11:58 +01001417 rgrp_blk = bstart - rgd->rd_data0;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001418
1419 while (blen--) {
1420 for (buf = 0; buf < length; buf++) {
1421 bi = rgd->rd_bits + buf;
1422 if (rgrp_blk < (bi->bi_start + bi->bi_len) * GFS2_NBBY)
1423 break;
1424 }
1425
1426 gfs2_assert(rgd->rd_sbd, buf < length);
1427
1428 buf_blk = rgrp_blk - bi->bi_start * GFS2_NBBY;
1429 rgrp_blk++;
1430
1431 if (!bi->bi_clone) {
1432 bi->bi_clone = kmalloc(bi->bi_bh->b_size,
Steven Whitehousedd894be2006-07-27 14:29:00 -04001433 GFP_NOFS | __GFP_NOFAIL);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001434 memcpy(bi->bi_clone + bi->bi_offset,
1435 bi->bi_bh->b_data + bi->bi_offset,
1436 bi->bi_len);
1437 }
Steven Whitehoused4e9c4c2006-01-18 11:19:28 +00001438 gfs2_trans_add_bh(rgd->rd_gl, bi->bi_bh, 1);
Steven Whitehouseb45e41d2008-02-06 10:11:15 +00001439 gfs2_setbit(rgd, bi->bi_bh->b_data, NULL, bi->bi_offset,
David Teiglandb3b94fa2006-01-16 16:50:04 +00001440 bi->bi_len, buf_blk, new_state);
1441 }
1442
1443 return rgd;
1444}
1445
1446/**
Steven Whitehouse09010972009-05-20 10:48:47 +01001447 * gfs2_rgrp_dump - print out an rgrp
1448 * @seq: The iterator
1449 * @gl: The glock in question
David Teiglandb3b94fa2006-01-16 16:50:04 +00001450 *
David Teiglandb3b94fa2006-01-16 16:50:04 +00001451 */
1452
Steven Whitehouse09010972009-05-20 10:48:47 +01001453int gfs2_rgrp_dump(struct seq_file *seq, const struct gfs2_glock *gl)
1454{
1455 const struct gfs2_rgrpd *rgd = gl->gl_object;
1456 if (rgd == NULL)
1457 return 0;
1458 gfs2_print_dbg(seq, " R: n:%llu f:%02x b:%u/%u i:%u\n",
1459 (unsigned long long)rgd->rd_addr, rgd->rd_flags,
1460 rgd->rd_free, rgd->rd_free_clone, rgd->rd_dinodes);
1461 return 0;
1462}
1463
Steven Whitehouse6050b9c2009-07-31 16:19:40 +01001464static void gfs2_rgrp_error(struct gfs2_rgrpd *rgd)
1465{
1466 struct gfs2_sbd *sdp = rgd->rd_sbd;
1467 fs_warn(sdp, "rgrp %llu has an error, marking it readonly until umount\n",
Steven Whitehouse86d00632009-09-14 09:50:57 +01001468 (unsigned long long)rgd->rd_addr);
Steven Whitehouse6050b9c2009-07-31 16:19:40 +01001469 fs_warn(sdp, "umount on all nodes and run fsck.gfs2 to fix the error\n");
1470 gfs2_rgrp_dump(NULL, rgd->rd_gl);
1471 rgd->rd_flags |= GFS2_RDF_ERROR;
1472}
1473
Steven Whitehouse09010972009-05-20 10:48:47 +01001474/**
1475 * gfs2_alloc_block - Allocate one or more blocks
1476 * @ip: the inode to allocate the block for
1477 * @bn: Used to return the starting block number
1478 * @n: requested number of blocks/extent length (value/result)
1479 *
1480 * Returns: 0 or error
1481 */
1482
1483int gfs2_alloc_block(struct gfs2_inode *ip, u64 *bn, unsigned int *n)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001484{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001485 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
Steven Whitehoused9ba7612009-04-23 08:59:41 +01001486 struct buffer_head *dibh;
Steven Whitehouse6dbd8222008-01-10 15:18:55 +00001487 struct gfs2_alloc *al = ip->i_alloc;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001488 struct gfs2_rgrpd *rgd = al->al_rgd;
Steven Whitehousecd915492006-09-04 12:49:07 -04001489 u32 goal, blk;
1490 u64 block;
Steven Whitehoused9ba7612009-04-23 08:59:41 +01001491 int error;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001492
Steven Whitehousece276b02008-02-06 09:25:45 +00001493 if (rgrp_contains_block(rgd, ip->i_goal))
1494 goal = ip->i_goal - rgd->rd_data0;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001495 else
Steven Whitehouseac576cc2008-02-01 10:34:15 +00001496 goal = rgd->rd_last_alloc;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001497
Steven Whitehouseb45e41d2008-02-06 10:11:15 +00001498 blk = rgblk_search(rgd, goal, GFS2_BLKST_FREE, GFS2_BLKST_USED, n);
Steven Whitehouse09010972009-05-20 10:48:47 +01001499
1500 /* Since all blocks are reserved in advance, this shouldn't happen */
1501 if (blk == BFITNOENT)
1502 goto rgrp_error;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001503
Steven Whitehouseb45e41d2008-02-06 10:11:15 +00001504 rgd->rd_last_alloc = blk;
Steven Whitehousebb8d8a62007-06-01 14:11:58 +01001505 block = rgd->rd_data0 + blk;
Steven Whitehousece276b02008-02-06 09:25:45 +00001506 ip->i_goal = block;
Steven Whitehoused9ba7612009-04-23 08:59:41 +01001507 error = gfs2_meta_inode_buffer(ip, &dibh);
1508 if (error == 0) {
1509 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
1510 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1511 di->di_goal_meta = di->di_goal_data = cpu_to_be64(ip->i_goal);
1512 brelse(dibh);
1513 }
Steven Whitehouse09010972009-05-20 10:48:47 +01001514 if (rgd->rd_free < *n)
1515 goto rgrp_error;
1516
Steven Whitehousecfc8b542008-11-04 10:25:13 +00001517 rgd->rd_free -= *n;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001518
Steven Whitehoused4e9c4c2006-01-18 11:19:28 +00001519 gfs2_trans_add_bh(rgd->rd_gl, rgd->rd_bits[0].bi_bh, 1);
Bob Peterson42d52e32008-01-28 18:38:07 -06001520 gfs2_rgrp_out(rgd, rgd->rd_bits[0].bi_bh->b_data);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001521
Steven Whitehouseb45e41d2008-02-06 10:11:15 +00001522 al->al_alloced += *n;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001523
Andrew Pricead99f772008-05-01 11:55:38 +01001524 gfs2_statfs_change(sdp, 0, -(s64)*n, 0);
Steven Whitehouseb45e41d2008-02-06 10:11:15 +00001525 gfs2_quota_change(ip, *n, ip->i_inode.i_uid, ip->i_inode.i_gid);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001526
1527 spin_lock(&sdp->sd_rindex_spin);
Steven Whitehouseb45e41d2008-02-06 10:11:15 +00001528 rgd->rd_free_clone -= *n;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001529 spin_unlock(&sdp->sd_rindex_spin);
Steven Whitehouse63997772009-06-12 08:49:20 +01001530 trace_gfs2_block_alloc(ip, block, *n, GFS2_BLKST_USED);
Steven Whitehouse09010972009-05-20 10:48:47 +01001531 *bn = block;
1532 return 0;
1533
1534rgrp_error:
Steven Whitehouse6050b9c2009-07-31 16:19:40 +01001535 gfs2_rgrp_error(rgd);
Steven Whitehouse09010972009-05-20 10:48:47 +01001536 return -EIO;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001537}
1538
1539/**
1540 * gfs2_alloc_di - Allocate a dinode
1541 * @dip: the directory that the inode is going in
Steven Whitehouse6050b9c2009-07-31 16:19:40 +01001542 * @bn: the block number which is allocated
1543 * @generation: the generation number of the inode
David Teiglandb3b94fa2006-01-16 16:50:04 +00001544 *
Steven Whitehouse6050b9c2009-07-31 16:19:40 +01001545 * Returns: 0 on success or error
David Teiglandb3b94fa2006-01-16 16:50:04 +00001546 */
1547
Steven Whitehouse6050b9c2009-07-31 16:19:40 +01001548int gfs2_alloc_di(struct gfs2_inode *dip, u64 *bn, u64 *generation)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001549{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001550 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
Steven Whitehouse6dbd8222008-01-10 15:18:55 +00001551 struct gfs2_alloc *al = dip->i_alloc;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001552 struct gfs2_rgrpd *rgd = al->al_rgd;
Steven Whitehouse4340fe62006-07-11 09:46:33 -04001553 u32 blk;
1554 u64 block;
Steven Whitehouseb45e41d2008-02-06 10:11:15 +00001555 unsigned int n = 1;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001556
Steven Whitehouseac576cc2008-02-01 10:34:15 +00001557 blk = rgblk_search(rgd, rgd->rd_last_alloc,
Steven Whitehouseb45e41d2008-02-06 10:11:15 +00001558 GFS2_BLKST_FREE, GFS2_BLKST_DINODE, &n);
Steven Whitehouse6050b9c2009-07-31 16:19:40 +01001559
1560 /* Since all blocks are reserved in advance, this shouldn't happen */
1561 if (blk == BFITNOENT)
1562 goto rgrp_error;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001563
Steven Whitehouseac576cc2008-02-01 10:34:15 +00001564 rgd->rd_last_alloc = blk;
Steven Whitehousebb8d8a62007-06-01 14:11:58 +01001565 block = rgd->rd_data0 + blk;
Steven Whitehouse05164e52009-08-17 11:06:43 +01001566 if (rgd->rd_free == 0)
1567 goto rgrp_error;
1568
Steven Whitehousecfc8b542008-11-04 10:25:13 +00001569 rgd->rd_free--;
Steven Whitehouse73f74942008-11-04 10:32:57 +00001570 rgd->rd_dinodes++;
Steven Whitehoused8b71f72008-11-04 10:19:03 +00001571 *generation = rgd->rd_igeneration++;
Steven Whitehouse8d8291a2009-08-27 15:51:07 +01001572 if (*generation == 0)
1573 *generation = rgd->rd_igeneration++;
Steven Whitehoused4e9c4c2006-01-18 11:19:28 +00001574 gfs2_trans_add_bh(rgd->rd_gl, rgd->rd_bits[0].bi_bh, 1);
Bob Peterson42d52e32008-01-28 18:38:07 -06001575 gfs2_rgrp_out(rgd, rgd->rd_bits[0].bi_bh->b_data);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001576
1577 al->al_alloced++;
1578
1579 gfs2_statfs_change(sdp, 0, -1, +1);
Steven Whitehouse5731be52008-02-01 13:16:55 +00001580 gfs2_trans_add_unrevoke(sdp, block, 1);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001581
1582 spin_lock(&sdp->sd_rindex_spin);
1583 rgd->rd_free_clone--;
1584 spin_unlock(&sdp->sd_rindex_spin);
Steven Whitehouse63997772009-06-12 08:49:20 +01001585 trace_gfs2_block_alloc(dip, block, 1, GFS2_BLKST_DINODE);
Steven Whitehouse6050b9c2009-07-31 16:19:40 +01001586 *bn = block;
1587 return 0;
1588
1589rgrp_error:
1590 gfs2_rgrp_error(rgd);
1591 return -EIO;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001592}
1593
1594/**
1595 * gfs2_free_data - free a contiguous run of data block(s)
1596 * @ip: the inode these blocks are being freed from
1597 * @bstart: first block of a run of contiguous blocks
1598 * @blen: the length of the block run
1599 *
1600 */
1601
Steven Whitehousecd915492006-09-04 12:49:07 -04001602void gfs2_free_data(struct gfs2_inode *ip, u64 bstart, u32 blen)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001603{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001604 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001605 struct gfs2_rgrpd *rgd;
1606
1607 rgd = rgblk_free(sdp, bstart, blen, GFS2_BLKST_FREE);
1608 if (!rgd)
1609 return;
Steven Whitehouse63997772009-06-12 08:49:20 +01001610 trace_gfs2_block_alloc(ip, bstart, blen, GFS2_BLKST_FREE);
Steven Whitehousecfc8b542008-11-04 10:25:13 +00001611 rgd->rd_free += blen;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001612
Steven Whitehoused4e9c4c2006-01-18 11:19:28 +00001613 gfs2_trans_add_bh(rgd->rd_gl, rgd->rd_bits[0].bi_bh, 1);
Bob Peterson42d52e32008-01-28 18:38:07 -06001614 gfs2_rgrp_out(rgd, rgd->rd_bits[0].bi_bh->b_data);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001615
1616 gfs2_trans_add_rg(rgd);
1617
1618 gfs2_statfs_change(sdp, 0, +blen, 0);
Steven Whitehouse2933f922006-11-01 13:23:29 -05001619 gfs2_quota_change(ip, -(s64)blen, ip->i_inode.i_uid, ip->i_inode.i_gid);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001620}
1621
1622/**
1623 * gfs2_free_meta - 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
Steven Whitehousecd915492006-09-04 12:49:07 -04001630void gfs2_free_meta(struct gfs2_inode *ip, u64 bstart, u32 blen)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001631{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001632 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001633 struct gfs2_rgrpd *rgd;
1634
1635 rgd = rgblk_free(sdp, bstart, blen, GFS2_BLKST_FREE);
1636 if (!rgd)
1637 return;
Steven Whitehouse63997772009-06-12 08:49:20 +01001638 trace_gfs2_block_alloc(ip, bstart, blen, GFS2_BLKST_FREE);
Steven Whitehousecfc8b542008-11-04 10:25:13 +00001639 rgd->rd_free += blen;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001640
Steven Whitehoused4e9c4c2006-01-18 11:19:28 +00001641 gfs2_trans_add_bh(rgd->rd_gl, rgd->rd_bits[0].bi_bh, 1);
Bob Peterson42d52e32008-01-28 18:38:07 -06001642 gfs2_rgrp_out(rgd, rgd->rd_bits[0].bi_bh->b_data);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001643
1644 gfs2_trans_add_rg(rgd);
1645
1646 gfs2_statfs_change(sdp, 0, +blen, 0);
Steven Whitehouse2933f922006-11-01 13:23:29 -05001647 gfs2_quota_change(ip, -(s64)blen, ip->i_inode.i_uid, ip->i_inode.i_gid);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001648 gfs2_meta_wipe(ip, bstart, blen);
1649}
1650
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001651void gfs2_unlink_di(struct inode *inode)
1652{
1653 struct gfs2_inode *ip = GFS2_I(inode);
1654 struct gfs2_sbd *sdp = GFS2_SB(inode);
1655 struct gfs2_rgrpd *rgd;
Steven Whitehousedbb7cae2007-05-15 15:37:50 +01001656 u64 blkno = ip->i_no_addr;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001657
1658 rgd = rgblk_free(sdp, blkno, 1, GFS2_BLKST_UNLINKED);
1659 if (!rgd)
1660 return;
Steven Whitehouse63997772009-06-12 08:49:20 +01001661 trace_gfs2_block_alloc(ip, blkno, 1, GFS2_BLKST_UNLINKED);
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001662 gfs2_trans_add_bh(rgd->rd_gl, rgd->rd_bits[0].bi_bh, 1);
Bob Peterson42d52e32008-01-28 18:38:07 -06001663 gfs2_rgrp_out(rgd, rgd->rd_bits[0].bi_bh->b_data);
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001664 gfs2_trans_add_rg(rgd);
1665}
1666
Steven Whitehousecd915492006-09-04 12:49:07 -04001667static void gfs2_free_uninit_di(struct gfs2_rgrpd *rgd, u64 blkno)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001668{
1669 struct gfs2_sbd *sdp = rgd->rd_sbd;
1670 struct gfs2_rgrpd *tmp_rgd;
1671
1672 tmp_rgd = rgblk_free(sdp, blkno, 1, GFS2_BLKST_FREE);
1673 if (!tmp_rgd)
1674 return;
1675 gfs2_assert_withdraw(sdp, rgd == tmp_rgd);
1676
Steven Whitehouse73f74942008-11-04 10:32:57 +00001677 if (!rgd->rd_dinodes)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001678 gfs2_consist_rgrpd(rgd);
Steven Whitehouse73f74942008-11-04 10:32:57 +00001679 rgd->rd_dinodes--;
Steven Whitehousecfc8b542008-11-04 10:25:13 +00001680 rgd->rd_free++;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001681
Steven Whitehoused4e9c4c2006-01-18 11:19:28 +00001682 gfs2_trans_add_bh(rgd->rd_gl, rgd->rd_bits[0].bi_bh, 1);
Bob Peterson42d52e32008-01-28 18:38:07 -06001683 gfs2_rgrp_out(rgd, rgd->rd_bits[0].bi_bh->b_data);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001684
1685 gfs2_statfs_change(sdp, 0, +1, -1);
1686 gfs2_trans_add_rg(rgd);
1687}
1688
David Teiglandb3b94fa2006-01-16 16:50:04 +00001689
1690void gfs2_free_di(struct gfs2_rgrpd *rgd, struct gfs2_inode *ip)
1691{
Steven Whitehousedbb7cae2007-05-15 15:37:50 +01001692 gfs2_free_uninit_di(rgd, ip->i_no_addr);
Steven Whitehouse63997772009-06-12 08:49:20 +01001693 trace_gfs2_block_alloc(ip, ip->i_no_addr, 1, GFS2_BLKST_FREE);
Steven Whitehouse2933f922006-11-01 13:23:29 -05001694 gfs2_quota_change(ip, -1, ip->i_inode.i_uid, ip->i_inode.i_gid);
Steven Whitehousedbb7cae2007-05-15 15:37:50 +01001695 gfs2_meta_wipe(ip, ip->i_no_addr, 1);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001696}
1697
1698/**
Steven Whitehouseacf7e242009-09-08 18:00:30 +01001699 * gfs2_check_blk_type - Check the type of a block
1700 * @sdp: The superblock
1701 * @no_addr: The block number to check
1702 * @type: The block type we are looking for
1703 *
1704 * Returns: 0 if the block type matches the expected type
1705 * -ESTALE if it doesn't match
1706 * or -ve errno if something went wrong while checking
1707 */
1708
1709int gfs2_check_blk_type(struct gfs2_sbd *sdp, u64 no_addr, unsigned int type)
1710{
1711 struct gfs2_rgrpd *rgd;
1712 struct gfs2_holder ri_gh, rgd_gh;
Steven Whitehouse2c776342009-11-06 11:10:51 +00001713 struct gfs2_inode *ip = GFS2_I(sdp->sd_rindex);
1714 int ri_locked = 0;
Steven Whitehouseacf7e242009-09-08 18:00:30 +01001715 int error;
1716
Steven Whitehouse2c776342009-11-06 11:10:51 +00001717 if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
1718 error = gfs2_rindex_hold(sdp, &ri_gh);
1719 if (error)
1720 goto fail;
1721 ri_locked = 1;
1722 }
Steven Whitehouseacf7e242009-09-08 18:00:30 +01001723
1724 error = -EINVAL;
1725 rgd = gfs2_blk2rgrpd(sdp, no_addr);
1726 if (!rgd)
1727 goto fail_rindex;
1728
1729 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_SHARED, 0, &rgd_gh);
1730 if (error)
1731 goto fail_rindex;
1732
1733 if (gfs2_get_block_type(rgd, no_addr) != type)
1734 error = -ESTALE;
1735
1736 gfs2_glock_dq_uninit(&rgd_gh);
1737fail_rindex:
Steven Whitehouse2c776342009-11-06 11:10:51 +00001738 if (ri_locked)
1739 gfs2_glock_dq_uninit(&ri_gh);
Steven Whitehouseacf7e242009-09-08 18:00:30 +01001740fail:
1741 return error;
1742}
1743
1744/**
David Teiglandb3b94fa2006-01-16 16:50:04 +00001745 * gfs2_rlist_add - add a RG to a list of RGs
1746 * @sdp: the filesystem
1747 * @rlist: the list of resource groups
1748 * @block: the block
1749 *
1750 * Figure out what RG a block belongs to and add that RG to the list
1751 *
1752 * FIXME: Don't use NOFAIL
1753 *
1754 */
1755
1756void gfs2_rlist_add(struct gfs2_sbd *sdp, struct gfs2_rgrp_list *rlist,
Steven Whitehousecd915492006-09-04 12:49:07 -04001757 u64 block)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001758{
1759 struct gfs2_rgrpd *rgd;
1760 struct gfs2_rgrpd **tmp;
1761 unsigned int new_space;
1762 unsigned int x;
1763
1764 if (gfs2_assert_warn(sdp, !rlist->rl_ghs))
1765 return;
1766
1767 rgd = gfs2_blk2rgrpd(sdp, block);
1768 if (!rgd) {
1769 if (gfs2_consist(sdp))
Steven Whitehouse382066d2006-05-24 10:22:09 -04001770 fs_err(sdp, "block = %llu\n", (unsigned long long)block);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001771 return;
1772 }
1773
1774 for (x = 0; x < rlist->rl_rgrps; x++)
1775 if (rlist->rl_rgd[x] == rgd)
1776 return;
1777
1778 if (rlist->rl_rgrps == rlist->rl_space) {
1779 new_space = rlist->rl_space + 10;
1780
1781 tmp = kcalloc(new_space, sizeof(struct gfs2_rgrpd *),
Steven Whitehousedd894be2006-07-27 14:29:00 -04001782 GFP_NOFS | __GFP_NOFAIL);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001783
1784 if (rlist->rl_rgd) {
1785 memcpy(tmp, rlist->rl_rgd,
1786 rlist->rl_space * sizeof(struct gfs2_rgrpd *));
1787 kfree(rlist->rl_rgd);
1788 }
1789
1790 rlist->rl_space = new_space;
1791 rlist->rl_rgd = tmp;
1792 }
1793
1794 rlist->rl_rgd[rlist->rl_rgrps++] = rgd;
1795}
1796
1797/**
1798 * gfs2_rlist_alloc - all RGs have been added to the rlist, now allocate
1799 * and initialize an array of glock holders for them
1800 * @rlist: the list of resource groups
1801 * @state: the lock state to acquire the RG lock in
1802 * @flags: the modifier flags for the holder structures
1803 *
1804 * FIXME: Don't use NOFAIL
1805 *
1806 */
1807
Bob Petersonfe6c9912008-01-28 11:13:02 -06001808void gfs2_rlist_alloc(struct gfs2_rgrp_list *rlist, unsigned int state)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001809{
1810 unsigned int x;
1811
1812 rlist->rl_ghs = kcalloc(rlist->rl_rgrps, sizeof(struct gfs2_holder),
Steven Whitehousedd894be2006-07-27 14:29:00 -04001813 GFP_NOFS | __GFP_NOFAIL);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001814 for (x = 0; x < rlist->rl_rgrps; x++)
1815 gfs2_holder_init(rlist->rl_rgd[x]->rd_gl,
Bob Petersonfe6c9912008-01-28 11:13:02 -06001816 state, 0,
David Teiglandb3b94fa2006-01-16 16:50:04 +00001817 &rlist->rl_ghs[x]);
1818}
1819
1820/**
1821 * gfs2_rlist_free - free a resource group list
1822 * @list: the list of resource groups
1823 *
1824 */
1825
1826void gfs2_rlist_free(struct gfs2_rgrp_list *rlist)
1827{
1828 unsigned int x;
1829
1830 kfree(rlist->rl_rgd);
1831
1832 if (rlist->rl_ghs) {
1833 for (x = 0; x < rlist->rl_rgrps; x++)
1834 gfs2_holder_uninit(&rlist->rl_ghs[x]);
1835 kfree(rlist->rl_ghs);
1836 }
1837}
1838