2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
5 * This copyrighted material is made available to anyone wishing to use,
6 * modify, copy, or redistribute it subject to the terms and conditions
7 * of the GNU General Public License version 2.
10 #include <linux/sched.h>
11 #include <linux/slab.h>
12 #include <linux/spinlock.h>
13 #include <linux/completion.h>
14 #include <linux/buffer_head.h>
16 #include <linux/gfs2_ondisk.h>
17 #include <linux/lm_interface.h>
32 #define BFITNOENT ((u32)~0)
35 * These routines are used by the resource group routines (rgrp.c)
36 * to keep track of block allocation. Each block is represented by two
37 * bits. So, each byte represents GFS2_NBBY (i.e. 4) blocks.
40 * 1 = Used (not metadata)
41 * 2 = Unlinked (still in use) inode
45 static const char valid_change[16] = {
54 * gfs2_setbit - Set a bit in the bitmaps
55 * @buffer: the buffer that holds the bitmaps
56 * @buflen: the length (in bytes) of the buffer
57 * @block: the block to set
58 * @new_state: the new state of the block
62 static void gfs2_setbit(struct gfs2_rgrpd *rgd, unsigned char *buffer,
63 unsigned int buflen, u32 block,
64 unsigned char new_state)
66 unsigned char *byte, *end, cur_state;
69 byte = buffer + (block / GFS2_NBBY);
70 bit = (block % GFS2_NBBY) * GFS2_BIT_SIZE;
71 end = buffer + buflen;
73 gfs2_assert(rgd->rd_sbd, byte < end);
75 cur_state = (*byte >> bit) & GFS2_BIT_MASK;
77 if (valid_change[new_state * 4 + cur_state]) {
78 *byte ^= cur_state << bit;
79 *byte |= new_state << bit;
81 gfs2_consist_rgrpd(rgd);
85 * gfs2_testbit - test a bit in the bitmaps
86 * @buffer: the buffer that holds the bitmaps
87 * @buflen: the length (in bytes) of the buffer
88 * @block: the block to read
92 static unsigned char gfs2_testbit(struct gfs2_rgrpd *rgd, unsigned char *buffer,
93 unsigned int buflen, u32 block)
95 unsigned char *byte, *end, cur_state;
98 byte = buffer + (block / GFS2_NBBY);
99 bit = (block % GFS2_NBBY) * GFS2_BIT_SIZE;
100 end = buffer + buflen;
102 gfs2_assert(rgd->rd_sbd, byte < end);
104 cur_state = (*byte >> bit) & GFS2_BIT_MASK;
110 * gfs2_bitfit - Search an rgrp's bitmap buffer to find a bit-pair representing
111 * a block in a given allocation state.
112 * @buffer: the buffer that holds the bitmaps
113 * @buflen: the length (in bytes) of the buffer
114 * @goal: start search at this block's bit-pair (within @buffer)
115 * @old_state: GFS2_BLKST_XXX the state of the block we're looking for;
116 * bit 0 = alloc(1)/free(0), bit 1 = meta(1)/data(0)
118 * Scope of @goal and returned block number is only within this bitmap buffer,
119 * not entire rgrp or filesystem. @buffer will be offset from the actual
120 * beginning of a bitmap block buffer, skipping any header structures.
122 * Return: the block number (bitmap buffer scope) that was found
125 static u32 gfs2_bitfit(struct gfs2_rgrpd *rgd, unsigned char *buffer,
126 unsigned int buflen, u32 goal,
127 unsigned char old_state)
129 unsigned char *byte, *end, alloc;
133 byte = buffer + (goal / GFS2_NBBY);
134 bit = (goal % GFS2_NBBY) * GFS2_BIT_SIZE;
135 end = buffer + buflen;
136 alloc = (old_state & 1) ? 0 : 0x55;
139 if ((*byte & 0x55) == alloc) {
140 blk += (8 - bit) >> 1;
148 if (((*byte >> bit) & GFS2_BIT_MASK) == old_state)
151 bit += GFS2_BIT_SIZE;
164 * gfs2_bitcount - count the number of bits in a certain state
165 * @buffer: the buffer that holds the bitmaps
166 * @buflen: the length (in bytes) of the buffer
167 * @state: the state of the block we're looking for
169 * Returns: The number of bits
172 static u32 gfs2_bitcount(struct gfs2_rgrpd *rgd, unsigned char *buffer,
173 unsigned int buflen, unsigned char state)
175 unsigned char *byte = buffer;
176 unsigned char *end = buffer + buflen;
177 unsigned char state1 = state << 2;
178 unsigned char state2 = state << 4;
179 unsigned char state3 = state << 6;
182 for (; byte < end; byte++) {
183 if (((*byte) & 0x03) == state)
185 if (((*byte) & 0x0C) == state1)
187 if (((*byte) & 0x30) == state2)
189 if (((*byte) & 0xC0) == state3)
197 * gfs2_rgrp_verify - Verify that a resource group is consistent
198 * @sdp: the filesystem
203 void gfs2_rgrp_verify(struct gfs2_rgrpd *rgd)
205 struct gfs2_sbd *sdp = rgd->rd_sbd;
206 struct gfs2_bitmap *bi = NULL;
207 u32 length = rgd->rd_ri.ri_length;
211 memset(count, 0, 4 * sizeof(u32));
213 /* Count # blocks in each of 4 possible allocation states */
214 for (buf = 0; buf < length; buf++) {
215 bi = rgd->rd_bits + buf;
216 for (x = 0; x < 4; x++)
217 count[x] += gfs2_bitcount(rgd,
223 if (count[0] != rgd->rd_rg.rg_free) {
224 if (gfs2_consist_rgrpd(rgd))
225 fs_err(sdp, "free data mismatch: %u != %u\n",
226 count[0], rgd->rd_rg.rg_free);
230 tmp = rgd->rd_ri.ri_data -
232 rgd->rd_rg.rg_dinodes;
233 if (count[1] + count[2] != tmp) {
234 if (gfs2_consist_rgrpd(rgd))
235 fs_err(sdp, "used data mismatch: %u != %u\n",
240 if (count[3] != rgd->rd_rg.rg_dinodes) {
241 if (gfs2_consist_rgrpd(rgd))
242 fs_err(sdp, "used metadata mismatch: %u != %u\n",
243 count[3], rgd->rd_rg.rg_dinodes);
247 if (count[2] > count[3]) {
248 if (gfs2_consist_rgrpd(rgd))
249 fs_err(sdp, "unlinked inodes > inodes: %u\n",
256 static inline int rgrp_contains_block(struct gfs2_rindex *ri, u64 block)
258 u64 first = ri->ri_data0;
259 u64 last = first + ri->ri_data;
260 return first <= block && block < last;
264 * gfs2_blk2rgrpd - Find resource group for a given data/meta block number
265 * @sdp: The GFS2 superblock
266 * @n: The data block number
268 * Returns: The resource group, or NULL if not found
271 struct gfs2_rgrpd *gfs2_blk2rgrpd(struct gfs2_sbd *sdp, u64 blk)
273 struct gfs2_rgrpd *rgd;
275 spin_lock(&sdp->sd_rindex_spin);
277 list_for_each_entry(rgd, &sdp->sd_rindex_mru_list, rd_list_mru) {
278 if (rgrp_contains_block(&rgd->rd_ri, blk)) {
279 list_move(&rgd->rd_list_mru, &sdp->sd_rindex_mru_list);
280 spin_unlock(&sdp->sd_rindex_spin);
285 spin_unlock(&sdp->sd_rindex_spin);
291 * gfs2_rgrpd_get_first - get the first Resource Group in the filesystem
292 * @sdp: The GFS2 superblock
294 * Returns: The first rgrp in the filesystem
297 struct gfs2_rgrpd *gfs2_rgrpd_get_first(struct gfs2_sbd *sdp)
299 gfs2_assert(sdp, !list_empty(&sdp->sd_rindex_list));
300 return list_entry(sdp->sd_rindex_list.next, struct gfs2_rgrpd, rd_list);
304 * gfs2_rgrpd_get_next - get the next RG
307 * Returns: The next rgrp
310 struct gfs2_rgrpd *gfs2_rgrpd_get_next(struct gfs2_rgrpd *rgd)
312 if (rgd->rd_list.next == &rgd->rd_sbd->sd_rindex_list)
314 return list_entry(rgd->rd_list.next, struct gfs2_rgrpd, rd_list);
317 static void clear_rgrpdi(struct gfs2_sbd *sdp)
319 struct list_head *head;
320 struct gfs2_rgrpd *rgd;
321 struct gfs2_glock *gl;
323 spin_lock(&sdp->sd_rindex_spin);
324 sdp->sd_rindex_forward = NULL;
325 head = &sdp->sd_rindex_recent_list;
326 while (!list_empty(head)) {
327 rgd = list_entry(head->next, struct gfs2_rgrpd, rd_recent);
328 list_del(&rgd->rd_recent);
330 spin_unlock(&sdp->sd_rindex_spin);
332 head = &sdp->sd_rindex_list;
333 while (!list_empty(head)) {
334 rgd = list_entry(head->next, struct gfs2_rgrpd, rd_list);
337 list_del(&rgd->rd_list);
338 list_del(&rgd->rd_list_mru);
341 gl->gl_object = NULL;
350 void gfs2_clear_rgrpd(struct gfs2_sbd *sdp)
352 mutex_lock(&sdp->sd_rindex_mutex);
354 mutex_unlock(&sdp->sd_rindex_mutex);
358 * gfs2_compute_bitstructs - Compute the bitmap sizes
359 * @rgd: The resource group descriptor
361 * Calculates bitmap descriptors, one for each block that contains bitmap data
366 static int compute_bitstructs(struct gfs2_rgrpd *rgd)
368 struct gfs2_sbd *sdp = rgd->rd_sbd;
369 struct gfs2_bitmap *bi;
370 u32 length = rgd->rd_ri.ri_length; /* # blocks in hdr & bitmap */
371 u32 bytes_left, bytes;
377 rgd->rd_bits = kcalloc(length, sizeof(struct gfs2_bitmap), GFP_NOFS);
381 bytes_left = rgd->rd_ri.ri_bitbytes;
383 for (x = 0; x < length; x++) {
384 bi = rgd->rd_bits + x;
386 /* small rgrp; bitmap stored completely in header block */
389 bi->bi_offset = sizeof(struct gfs2_rgrp);
394 bytes = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_rgrp);
395 bi->bi_offset = sizeof(struct gfs2_rgrp);
399 } else if (x + 1 == length) {
401 bi->bi_offset = sizeof(struct gfs2_meta_header);
402 bi->bi_start = rgd->rd_ri.ri_bitbytes - bytes_left;
406 bytes = sdp->sd_sb.sb_bsize -
407 sizeof(struct gfs2_meta_header);
408 bi->bi_offset = sizeof(struct gfs2_meta_header);
409 bi->bi_start = rgd->rd_ri.ri_bitbytes - bytes_left;
417 gfs2_consist_rgrpd(rgd);
420 bi = rgd->rd_bits + (length - 1);
421 if ((bi->bi_start + bi->bi_len) * GFS2_NBBY != rgd->rd_ri.ri_data) {
422 if (gfs2_consist_rgrpd(rgd)) {
423 gfs2_rindex_print(&rgd->rd_ri);
424 fs_err(sdp, "start=%u len=%u offset=%u\n",
425 bi->bi_start, bi->bi_len, bi->bi_offset);
434 * gfs2_ri_update - Pull in a new resource index from the disk
435 * @gl: The glock covering the rindex inode
437 * Returns: 0 on successful update, error code otherwise
440 static int gfs2_ri_update(struct gfs2_inode *ip)
442 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
443 struct inode *inode = &ip->i_inode;
444 struct gfs2_rgrpd *rgd;
445 char buf[sizeof(struct gfs2_rindex)];
446 struct file_ra_state ra_state;
447 u64 junk = ip->i_di.di_size;
450 if (do_div(junk, sizeof(struct gfs2_rindex))) {
451 gfs2_consist_inode(ip);
457 file_ra_state_init(&ra_state, inode->i_mapping);
458 for (sdp->sd_rgrps = 0;; sdp->sd_rgrps++) {
459 loff_t pos = sdp->sd_rgrps * sizeof(struct gfs2_rindex);
460 error = gfs2_internal_read(ip, &ra_state, buf, &pos,
461 sizeof(struct gfs2_rindex));
464 if (error != sizeof(struct gfs2_rindex)) {
470 rgd = kzalloc(sizeof(struct gfs2_rgrpd), GFP_NOFS);
475 mutex_init(&rgd->rd_mutex);
476 lops_init_le(&rgd->rd_le, &gfs2_rg_lops);
479 list_add_tail(&rgd->rd_list, &sdp->sd_rindex_list);
480 list_add_tail(&rgd->rd_list_mru, &sdp->sd_rindex_mru_list);
482 gfs2_rindex_in(&rgd->rd_ri, buf);
483 error = compute_bitstructs(rgd);
487 error = gfs2_glock_get(sdp, rgd->rd_ri.ri_addr,
488 &gfs2_rgrp_glops, CREATE, &rgd->rd_gl);
492 rgd->rd_gl->gl_object = rgd;
493 rgd->rd_rg_vn = rgd->rd_gl->gl_vn - 1;
496 sdp->sd_rindex_vn = ip->i_gl->gl_vn;
505 * gfs2_rindex_hold - Grab a lock on the rindex
506 * @sdp: The GFS2 superblock
507 * @ri_gh: the glock holder
509 * We grab a lock on the rindex inode to make sure that it doesn't
510 * change whilst we are performing an operation. We keep this lock
511 * for quite long periods of time compared to other locks. This
512 * doesn't matter, since it is shared and it is very, very rarely
513 * accessed in the exclusive mode (i.e. only when expanding the filesystem).
515 * This makes sure that we're using the latest copy of the resource index
516 * special file, which might have been updated if someone expanded the
517 * filesystem (via gfs2_grow utility), which adds new resource groups.
519 * Returns: 0 on success, error code otherwise
522 int gfs2_rindex_hold(struct gfs2_sbd *sdp, struct gfs2_holder *ri_gh)
524 struct gfs2_inode *ip = GFS2_I(sdp->sd_rindex);
525 struct gfs2_glock *gl = ip->i_gl;
528 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, 0, ri_gh);
532 /* Read new copy from disk if we don't have the latest */
533 if (sdp->sd_rindex_vn != gl->gl_vn) {
534 mutex_lock(&sdp->sd_rindex_mutex);
535 if (sdp->sd_rindex_vn != gl->gl_vn) {
536 error = gfs2_ri_update(ip);
538 gfs2_glock_dq_uninit(ri_gh);
540 mutex_unlock(&sdp->sd_rindex_mutex);
547 * gfs2_rgrp_bh_get - Read in a RG's header and bitmaps
548 * @rgd: the struct gfs2_rgrpd describing the RG to read in
550 * Read in all of a Resource Group's header and bitmap blocks.
551 * Caller must eventually call gfs2_rgrp_relse() to free the bitmaps.
556 int gfs2_rgrp_bh_get(struct gfs2_rgrpd *rgd)
558 struct gfs2_sbd *sdp = rgd->rd_sbd;
559 struct gfs2_glock *gl = rgd->rd_gl;
560 unsigned int length = rgd->rd_ri.ri_length;
561 struct gfs2_bitmap *bi;
565 mutex_lock(&rgd->rd_mutex);
567 spin_lock(&sdp->sd_rindex_spin);
568 if (rgd->rd_bh_count) {
570 spin_unlock(&sdp->sd_rindex_spin);
571 mutex_unlock(&rgd->rd_mutex);
574 spin_unlock(&sdp->sd_rindex_spin);
576 for (x = 0; x < length; x++) {
577 bi = rgd->rd_bits + x;
578 error = gfs2_meta_read(gl, rgd->rd_ri.ri_addr + x, 0, &bi->bi_bh);
583 for (y = length; y--;) {
584 bi = rgd->rd_bits + y;
585 error = gfs2_meta_wait(sdp, bi->bi_bh);
588 if (gfs2_metatype_check(sdp, bi->bi_bh, y ? GFS2_METATYPE_RB :
595 if (rgd->rd_rg_vn != gl->gl_vn) {
596 gfs2_rgrp_in(&rgd->rd_rg, (rgd->rd_bits[0].bi_bh)->b_data);
597 rgd->rd_rg_vn = gl->gl_vn;
600 spin_lock(&sdp->sd_rindex_spin);
601 rgd->rd_free_clone = rgd->rd_rg.rg_free;
603 spin_unlock(&sdp->sd_rindex_spin);
605 mutex_unlock(&rgd->rd_mutex);
611 bi = rgd->rd_bits + x;
614 gfs2_assert_warn(sdp, !bi->bi_clone);
616 mutex_unlock(&rgd->rd_mutex);
621 void gfs2_rgrp_bh_hold(struct gfs2_rgrpd *rgd)
623 struct gfs2_sbd *sdp = rgd->rd_sbd;
625 spin_lock(&sdp->sd_rindex_spin);
626 gfs2_assert_warn(rgd->rd_sbd, rgd->rd_bh_count);
628 spin_unlock(&sdp->sd_rindex_spin);
632 * gfs2_rgrp_bh_put - Release RG bitmaps read in with gfs2_rgrp_bh_get()
633 * @rgd: the struct gfs2_rgrpd describing the RG to read in
637 void gfs2_rgrp_bh_put(struct gfs2_rgrpd *rgd)
639 struct gfs2_sbd *sdp = rgd->rd_sbd;
640 int x, length = rgd->rd_ri.ri_length;
642 spin_lock(&sdp->sd_rindex_spin);
643 gfs2_assert_warn(rgd->rd_sbd, rgd->rd_bh_count);
644 if (--rgd->rd_bh_count) {
645 spin_unlock(&sdp->sd_rindex_spin);
649 for (x = 0; x < length; x++) {
650 struct gfs2_bitmap *bi = rgd->rd_bits + x;
657 spin_unlock(&sdp->sd_rindex_spin);
660 void gfs2_rgrp_repolish_clones(struct gfs2_rgrpd *rgd)
662 struct gfs2_sbd *sdp = rgd->rd_sbd;
663 unsigned int length = rgd->rd_ri.ri_length;
666 for (x = 0; x < length; x++) {
667 struct gfs2_bitmap *bi = rgd->rd_bits + x;
670 memcpy(bi->bi_clone + bi->bi_offset,
671 bi->bi_bh->b_data + bi->bi_offset, bi->bi_len);
674 spin_lock(&sdp->sd_rindex_spin);
675 rgd->rd_free_clone = rgd->rd_rg.rg_free;
676 spin_unlock(&sdp->sd_rindex_spin);
680 * gfs2_alloc_get - get the struct gfs2_alloc structure for an inode
681 * @ip: the incore GFS2 inode structure
683 * Returns: the struct gfs2_alloc
686 struct gfs2_alloc *gfs2_alloc_get(struct gfs2_inode *ip)
688 struct gfs2_alloc *al = &ip->i_alloc;
690 /* FIXME: Should assert that the correct locks are held here... */
691 memset(al, 0, sizeof(*al));
696 * try_rgrp_fit - See if a given reservation will fit in a given RG
698 * @al: the struct gfs2_alloc structure describing the reservation
700 * If there's room for the requested blocks to be allocated from the RG:
701 * Sets the $al_reserved_data field in @al.
702 * Sets the $al_reserved_meta field in @al.
703 * Sets the $al_rgd field in @al.
705 * Returns: 1 on success (it fits), 0 on failure (it doesn't fit)
708 static int try_rgrp_fit(struct gfs2_rgrpd *rgd, struct gfs2_alloc *al)
710 struct gfs2_sbd *sdp = rgd->rd_sbd;
713 spin_lock(&sdp->sd_rindex_spin);
714 if (rgd->rd_free_clone >= al->al_requested) {
718 spin_unlock(&sdp->sd_rindex_spin);
724 * recent_rgrp_first - get first RG from "recent" list
725 * @sdp: The GFS2 superblock
726 * @rglast: address of the rgrp used last
728 * Returns: The first rgrp in the recent list
731 static struct gfs2_rgrpd *recent_rgrp_first(struct gfs2_sbd *sdp,
734 struct gfs2_rgrpd *rgd = NULL;
736 spin_lock(&sdp->sd_rindex_spin);
738 if (list_empty(&sdp->sd_rindex_recent_list))
744 list_for_each_entry(rgd, &sdp->sd_rindex_recent_list, rd_recent) {
745 if (rgd->rd_ri.ri_addr == rglast)
750 rgd = list_entry(sdp->sd_rindex_recent_list.next, struct gfs2_rgrpd,
753 spin_unlock(&sdp->sd_rindex_spin);
758 * recent_rgrp_next - get next RG from "recent" list
759 * @cur_rgd: current rgrp
762 * Returns: The next rgrp in the recent list
765 static struct gfs2_rgrpd *recent_rgrp_next(struct gfs2_rgrpd *cur_rgd,
768 struct gfs2_sbd *sdp = cur_rgd->rd_sbd;
769 struct list_head *head;
770 struct gfs2_rgrpd *rgd;
772 spin_lock(&sdp->sd_rindex_spin);
774 head = &sdp->sd_rindex_recent_list;
776 list_for_each_entry(rgd, head, rd_recent) {
777 if (rgd == cur_rgd) {
778 if (cur_rgd->rd_recent.next != head)
779 rgd = list_entry(cur_rgd->rd_recent.next,
780 struct gfs2_rgrpd, rd_recent);
785 list_del(&cur_rgd->rd_recent);
792 if (!list_empty(head))
793 rgd = list_entry(head->next, struct gfs2_rgrpd, rd_recent);
796 spin_unlock(&sdp->sd_rindex_spin);
801 * recent_rgrp_add - add an RG to tail of "recent" list
802 * @new_rgd: The rgrp to add
806 static void recent_rgrp_add(struct gfs2_rgrpd *new_rgd)
808 struct gfs2_sbd *sdp = new_rgd->rd_sbd;
809 struct gfs2_rgrpd *rgd;
810 unsigned int count = 0;
811 unsigned int max = sdp->sd_rgrps / gfs2_jindex_size(sdp);
813 spin_lock(&sdp->sd_rindex_spin);
815 list_for_each_entry(rgd, &sdp->sd_rindex_recent_list, rd_recent) {
822 list_add_tail(&new_rgd->rd_recent, &sdp->sd_rindex_recent_list);
825 spin_unlock(&sdp->sd_rindex_spin);
829 * forward_rgrp_get - get an rgrp to try next from full list
830 * @sdp: The GFS2 superblock
832 * Returns: The rgrp to try next
835 static struct gfs2_rgrpd *forward_rgrp_get(struct gfs2_sbd *sdp)
837 struct gfs2_rgrpd *rgd;
838 unsigned int journals = gfs2_jindex_size(sdp);
839 unsigned int rg = 0, x;
841 spin_lock(&sdp->sd_rindex_spin);
843 rgd = sdp->sd_rindex_forward;
845 if (sdp->sd_rgrps >= journals)
846 rg = sdp->sd_rgrps * sdp->sd_jdesc->jd_jid / journals;
848 for (x = 0, rgd = gfs2_rgrpd_get_first(sdp); x < rg;
849 x++, rgd = gfs2_rgrpd_get_next(rgd))
852 sdp->sd_rindex_forward = rgd;
855 spin_unlock(&sdp->sd_rindex_spin);
861 * forward_rgrp_set - set the forward rgrp pointer
862 * @sdp: the filesystem
863 * @rgd: The new forward rgrp
867 static void forward_rgrp_set(struct gfs2_sbd *sdp, struct gfs2_rgrpd *rgd)
869 spin_lock(&sdp->sd_rindex_spin);
870 sdp->sd_rindex_forward = rgd;
871 spin_unlock(&sdp->sd_rindex_spin);
875 * get_local_rgrp - Choose and lock a rgrp for allocation
876 * @ip: the inode to reserve space for
877 * @rgp: the chosen and locked rgrp
879 * Try to acquire rgrp in way which avoids contending with others.
884 static int get_local_rgrp(struct gfs2_inode *ip)
886 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
887 struct gfs2_rgrpd *rgd, *begin = NULL;
888 struct gfs2_alloc *al = &ip->i_alloc;
889 int flags = LM_FLAG_TRY;
894 /* Try recently successful rgrps */
896 rgd = recent_rgrp_first(sdp, ip->i_last_rg_alloc);
899 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE,
900 LM_FLAG_TRY, &al->al_rgd_gh);
903 if (try_rgrp_fit(rgd, al))
905 gfs2_glock_dq_uninit(&al->al_rgd_gh);
906 rgd = recent_rgrp_next(rgd, 1);
910 rgd = recent_rgrp_next(rgd, 0);
918 /* Go through full list of rgrps */
920 begin = rgd = forward_rgrp_get(sdp);
923 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, flags,
927 if (try_rgrp_fit(rgd, al))
929 gfs2_glock_dq_uninit(&al->al_rgd_gh);
940 rgd = gfs2_rgrpd_get_next(rgd);
942 rgd = gfs2_rgrpd_get_first(sdp);
945 if (++loops >= 2 || !skipped)
952 ip->i_last_rg_alloc = rgd->rd_ri.ri_addr;
955 recent_rgrp_add(rgd);
956 rgd = gfs2_rgrpd_get_next(rgd);
958 rgd = gfs2_rgrpd_get_first(sdp);
959 forward_rgrp_set(sdp, rgd);
966 * gfs2_inplace_reserve_i - Reserve space in the filesystem
967 * @ip: the inode to reserve space for
972 int gfs2_inplace_reserve_i(struct gfs2_inode *ip, char *file, unsigned int line)
974 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
975 struct gfs2_alloc *al = &ip->i_alloc;
978 if (gfs2_assert_warn(sdp, al->al_requested))
981 error = gfs2_rindex_hold(sdp, &al->al_ri_gh);
985 error = get_local_rgrp(ip);
987 gfs2_glock_dq_uninit(&al->al_ri_gh);
998 * gfs2_inplace_release - release an inplace reservation
999 * @ip: the inode the reservation was taken out on
1001 * Release a reservation made by gfs2_inplace_reserve().
1004 void gfs2_inplace_release(struct gfs2_inode *ip)
1006 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1007 struct gfs2_alloc *al = &ip->i_alloc;
1009 if (gfs2_assert_warn(sdp, al->al_alloced <= al->al_requested) == -1)
1010 fs_warn(sdp, "al_alloced = %u, al_requested = %u "
1011 "al_file = %s, al_line = %u\n",
1012 al->al_alloced, al->al_requested, al->al_file,
1016 gfs2_glock_dq_uninit(&al->al_rgd_gh);
1017 gfs2_glock_dq_uninit(&al->al_ri_gh);
1021 * gfs2_get_block_type - Check a block in a RG is of given type
1022 * @rgd: the resource group holding the block
1023 * @block: the block number
1025 * Returns: The block type (GFS2_BLKST_*)
1028 unsigned char gfs2_get_block_type(struct gfs2_rgrpd *rgd, u64 block)
1030 struct gfs2_bitmap *bi = NULL;
1031 u32 length, rgrp_block, buf_block;
1035 length = rgd->rd_ri.ri_length;
1036 rgrp_block = block - rgd->rd_ri.ri_data0;
1038 for (buf = 0; buf < length; buf++) {
1039 bi = rgd->rd_bits + buf;
1040 if (rgrp_block < (bi->bi_start + bi->bi_len) * GFS2_NBBY)
1044 gfs2_assert(rgd->rd_sbd, buf < length);
1045 buf_block = rgrp_block - bi->bi_start * GFS2_NBBY;
1047 type = gfs2_testbit(rgd, bi->bi_bh->b_data + bi->bi_offset,
1048 bi->bi_len, buf_block);
1054 * rgblk_search - find a block in @old_state, change allocation
1055 * state to @new_state
1056 * @rgd: the resource group descriptor
1057 * @goal: the goal block within the RG (start here to search for avail block)
1058 * @old_state: GFS2_BLKST_XXX the before-allocation state to find
1059 * @new_state: GFS2_BLKST_XXX the after-allocation block state
1061 * Walk rgrp's bitmap to find bits that represent a block in @old_state.
1062 * Add the found bitmap buffer to the transaction.
1063 * Set the found bits to @new_state to change block's allocation state.
1065 * This function never fails, because we wouldn't call it unless we
1066 * know (from reservation results, etc.) that a block is available.
1068 * Scope of @goal and returned block is just within rgrp, not the whole
1071 * Returns: the block number allocated
1074 static u32 rgblk_search(struct gfs2_rgrpd *rgd, u32 goal,
1075 unsigned char old_state, unsigned char new_state)
1077 struct gfs2_bitmap *bi = NULL;
1078 u32 length = rgd->rd_ri.ri_length;
1080 unsigned int buf, x;
1082 /* Find bitmap block that contains bits for goal block */
1083 for (buf = 0; buf < length; buf++) {
1084 bi = rgd->rd_bits + buf;
1085 if (goal < (bi->bi_start + bi->bi_len) * GFS2_NBBY)
1089 gfs2_assert(rgd->rd_sbd, buf < length);
1091 /* Convert scope of "goal" from rgrp-wide to within found bit block */
1092 goal -= bi->bi_start * GFS2_NBBY;
1094 /* Search (up to entire) bitmap in this rgrp for allocatable block.
1095 "x <= length", instead of "x < length", because we typically start
1096 the search in the middle of a bit block, but if we can't find an
1097 allocatable block anywhere else, we want to be able wrap around and
1098 search in the first part of our first-searched bit block. */
1099 for (x = 0; x <= length; x++) {
1101 blk = gfs2_bitfit(rgd, bi->bi_clone + bi->bi_offset,
1102 bi->bi_len, goal, old_state);
1104 blk = gfs2_bitfit(rgd,
1105 bi->bi_bh->b_data + bi->bi_offset,
1106 bi->bi_len, goal, old_state);
1107 if (blk != BFITNOENT)
1110 /* Try next bitmap block (wrap back to rgrp header if at end) */
1111 buf = (buf + 1) % length;
1112 bi = rgd->rd_bits + buf;
1116 if (gfs2_assert_withdraw(rgd->rd_sbd, x <= length))
1119 gfs2_trans_add_bh(rgd->rd_gl, bi->bi_bh, 1);
1120 gfs2_setbit(rgd, bi->bi_bh->b_data + bi->bi_offset,
1121 bi->bi_len, blk, new_state);
1123 gfs2_setbit(rgd, bi->bi_clone + bi->bi_offset,
1124 bi->bi_len, blk, new_state);
1126 return bi->bi_start * GFS2_NBBY + blk;
1130 * rgblk_free - Change alloc state of given block(s)
1131 * @sdp: the filesystem
1132 * @bstart: the start of a run of blocks to free
1133 * @blen: the length of the block run (all must lie within ONE RG!)
1134 * @new_state: GFS2_BLKST_XXX the after-allocation block state
1136 * Returns: Resource group containing the block(s)
1139 static struct gfs2_rgrpd *rgblk_free(struct gfs2_sbd *sdp, u64 bstart,
1140 u32 blen, unsigned char new_state)
1142 struct gfs2_rgrpd *rgd;
1143 struct gfs2_bitmap *bi = NULL;
1144 u32 length, rgrp_blk, buf_blk;
1147 rgd = gfs2_blk2rgrpd(sdp, bstart);
1149 if (gfs2_consist(sdp))
1150 fs_err(sdp, "block = %llu\n", (unsigned long long)bstart);
1154 length = rgd->rd_ri.ri_length;
1156 rgrp_blk = bstart - rgd->rd_ri.ri_data0;
1159 for (buf = 0; buf < length; buf++) {
1160 bi = rgd->rd_bits + buf;
1161 if (rgrp_blk < (bi->bi_start + bi->bi_len) * GFS2_NBBY)
1165 gfs2_assert(rgd->rd_sbd, buf < length);
1167 buf_blk = rgrp_blk - bi->bi_start * GFS2_NBBY;
1170 if (!bi->bi_clone) {
1171 bi->bi_clone = kmalloc(bi->bi_bh->b_size,
1172 GFP_NOFS | __GFP_NOFAIL);
1173 memcpy(bi->bi_clone + bi->bi_offset,
1174 bi->bi_bh->b_data + bi->bi_offset,
1177 gfs2_trans_add_bh(rgd->rd_gl, bi->bi_bh, 1);
1178 gfs2_setbit(rgd, bi->bi_bh->b_data + bi->bi_offset,
1179 bi->bi_len, buf_blk, new_state);
1186 * gfs2_alloc_data - Allocate a data block
1187 * @ip: the inode to allocate the data block for
1189 * Returns: the allocated block
1192 u64 gfs2_alloc_data(struct gfs2_inode *ip)
1194 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1195 struct gfs2_alloc *al = &ip->i_alloc;
1196 struct gfs2_rgrpd *rgd = al->al_rgd;
1200 if (rgrp_contains_block(&rgd->rd_ri, ip->i_di.di_goal_data))
1201 goal = ip->i_di.di_goal_data - rgd->rd_ri.ri_data0;
1203 goal = rgd->rd_last_alloc_data;
1205 blk = rgblk_search(rgd, goal, GFS2_BLKST_FREE, GFS2_BLKST_USED);
1206 rgd->rd_last_alloc_data = blk;
1208 block = rgd->rd_ri.ri_data0 + blk;
1209 ip->i_di.di_goal_data = block;
1211 gfs2_assert_withdraw(sdp, rgd->rd_rg.rg_free);
1212 rgd->rd_rg.rg_free--;
1214 gfs2_trans_add_bh(rgd->rd_gl, rgd->rd_bits[0].bi_bh, 1);
1215 gfs2_rgrp_out(&rgd->rd_rg, rgd->rd_bits[0].bi_bh->b_data);
1219 gfs2_statfs_change(sdp, 0, -1, 0);
1220 gfs2_quota_change(ip, +1, ip->i_di.di_uid, ip->i_di.di_gid);
1222 spin_lock(&sdp->sd_rindex_spin);
1223 rgd->rd_free_clone--;
1224 spin_unlock(&sdp->sd_rindex_spin);
1230 * gfs2_alloc_meta - Allocate a metadata block
1231 * @ip: the inode to allocate the metadata block for
1233 * Returns: the allocated block
1236 u64 gfs2_alloc_meta(struct gfs2_inode *ip)
1238 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1239 struct gfs2_alloc *al = &ip->i_alloc;
1240 struct gfs2_rgrpd *rgd = al->al_rgd;
1244 if (rgrp_contains_block(&rgd->rd_ri, ip->i_di.di_goal_meta))
1245 goal = ip->i_di.di_goal_meta - rgd->rd_ri.ri_data0;
1247 goal = rgd->rd_last_alloc_meta;
1249 blk = rgblk_search(rgd, goal, GFS2_BLKST_FREE, GFS2_BLKST_USED);
1250 rgd->rd_last_alloc_meta = blk;
1252 block = rgd->rd_ri.ri_data0 + blk;
1253 ip->i_di.di_goal_meta = block;
1255 gfs2_assert_withdraw(sdp, rgd->rd_rg.rg_free);
1256 rgd->rd_rg.rg_free--;
1258 gfs2_trans_add_bh(rgd->rd_gl, rgd->rd_bits[0].bi_bh, 1);
1259 gfs2_rgrp_out(&rgd->rd_rg, rgd->rd_bits[0].bi_bh->b_data);
1263 gfs2_statfs_change(sdp, 0, -1, 0);
1264 gfs2_quota_change(ip, +1, ip->i_di.di_uid, ip->i_di.di_gid);
1265 gfs2_trans_add_unrevoke(sdp, block);
1267 spin_lock(&sdp->sd_rindex_spin);
1268 rgd->rd_free_clone--;
1269 spin_unlock(&sdp->sd_rindex_spin);
1275 * gfs2_alloc_di - Allocate a dinode
1276 * @dip: the directory that the inode is going in
1278 * Returns: the block allocated
1281 u64 gfs2_alloc_di(struct gfs2_inode *dip, u64 *generation)
1283 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
1284 struct gfs2_alloc *al = &dip->i_alloc;
1285 struct gfs2_rgrpd *rgd = al->al_rgd;
1289 blk = rgblk_search(rgd, rgd->rd_last_alloc_meta,
1290 GFS2_BLKST_FREE, GFS2_BLKST_DINODE);
1292 rgd->rd_last_alloc_meta = blk;
1294 block = rgd->rd_ri.ri_data0 + blk;
1296 gfs2_assert_withdraw(sdp, rgd->rd_rg.rg_free);
1297 rgd->rd_rg.rg_free--;
1298 rgd->rd_rg.rg_dinodes++;
1299 *generation = rgd->rd_rg.rg_igeneration++;
1300 gfs2_trans_add_bh(rgd->rd_gl, rgd->rd_bits[0].bi_bh, 1);
1301 gfs2_rgrp_out(&rgd->rd_rg, rgd->rd_bits[0].bi_bh->b_data);
1305 gfs2_statfs_change(sdp, 0, -1, +1);
1306 gfs2_trans_add_unrevoke(sdp, block);
1308 spin_lock(&sdp->sd_rindex_spin);
1309 rgd->rd_free_clone--;
1310 spin_unlock(&sdp->sd_rindex_spin);
1316 * gfs2_free_data - free a contiguous run of data block(s)
1317 * @ip: the inode these blocks are being freed from
1318 * @bstart: first block of a run of contiguous blocks
1319 * @blen: the length of the block run
1323 void gfs2_free_data(struct gfs2_inode *ip, u64 bstart, u32 blen)
1325 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1326 struct gfs2_rgrpd *rgd;
1328 rgd = rgblk_free(sdp, bstart, blen, GFS2_BLKST_FREE);
1332 rgd->rd_rg.rg_free += blen;
1334 gfs2_trans_add_bh(rgd->rd_gl, rgd->rd_bits[0].bi_bh, 1);
1335 gfs2_rgrp_out(&rgd->rd_rg, rgd->rd_bits[0].bi_bh->b_data);
1337 gfs2_trans_add_rg(rgd);
1339 gfs2_statfs_change(sdp, 0, +blen, 0);
1340 gfs2_quota_change(ip, -(s64)blen,
1341 ip->i_di.di_uid, ip->i_di.di_gid);
1345 * gfs2_free_meta - free a contiguous run of data block(s)
1346 * @ip: the inode these blocks are being freed from
1347 * @bstart: first block of a run of contiguous blocks
1348 * @blen: the length of the block run
1352 void gfs2_free_meta(struct gfs2_inode *ip, u64 bstart, u32 blen)
1354 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1355 struct gfs2_rgrpd *rgd;
1357 rgd = rgblk_free(sdp, bstart, blen, GFS2_BLKST_FREE);
1361 rgd->rd_rg.rg_free += blen;
1363 gfs2_trans_add_bh(rgd->rd_gl, rgd->rd_bits[0].bi_bh, 1);
1364 gfs2_rgrp_out(&rgd->rd_rg, rgd->rd_bits[0].bi_bh->b_data);
1366 gfs2_trans_add_rg(rgd);
1368 gfs2_statfs_change(sdp, 0, +blen, 0);
1369 gfs2_quota_change(ip, -(s64)blen, ip->i_di.di_uid, ip->i_di.di_gid);
1370 gfs2_meta_wipe(ip, bstart, blen);
1373 void gfs2_unlink_di(struct inode *inode)
1375 struct gfs2_inode *ip = GFS2_I(inode);
1376 struct gfs2_sbd *sdp = GFS2_SB(inode);
1377 struct gfs2_rgrpd *rgd;
1378 u64 blkno = ip->i_num.no_addr;
1380 rgd = rgblk_free(sdp, blkno, 1, GFS2_BLKST_UNLINKED);
1383 gfs2_trans_add_bh(rgd->rd_gl, rgd->rd_bits[0].bi_bh, 1);
1384 gfs2_rgrp_out(&rgd->rd_rg, rgd->rd_bits[0].bi_bh->b_data);
1385 gfs2_trans_add_rg(rgd);
1388 static void gfs2_free_uninit_di(struct gfs2_rgrpd *rgd, u64 blkno)
1390 struct gfs2_sbd *sdp = rgd->rd_sbd;
1391 struct gfs2_rgrpd *tmp_rgd;
1393 tmp_rgd = rgblk_free(sdp, blkno, 1, GFS2_BLKST_FREE);
1396 gfs2_assert_withdraw(sdp, rgd == tmp_rgd);
1398 if (!rgd->rd_rg.rg_dinodes)
1399 gfs2_consist_rgrpd(rgd);
1400 rgd->rd_rg.rg_dinodes--;
1401 rgd->rd_rg.rg_free++;
1403 gfs2_trans_add_bh(rgd->rd_gl, rgd->rd_bits[0].bi_bh, 1);
1404 gfs2_rgrp_out(&rgd->rd_rg, rgd->rd_bits[0].bi_bh->b_data);
1406 gfs2_statfs_change(sdp, 0, +1, -1);
1407 gfs2_trans_add_rg(rgd);
1411 void gfs2_free_di(struct gfs2_rgrpd *rgd, struct gfs2_inode *ip)
1413 gfs2_free_uninit_di(rgd, ip->i_num.no_addr);
1414 gfs2_quota_change(ip, -1, ip->i_di.di_uid, ip->i_di.di_gid);
1415 gfs2_meta_wipe(ip, ip->i_num.no_addr, 1);
1419 * gfs2_rlist_add - add a RG to a list of RGs
1420 * @sdp: the filesystem
1421 * @rlist: the list of resource groups
1424 * Figure out what RG a block belongs to and add that RG to the list
1426 * FIXME: Don't use NOFAIL
1430 void gfs2_rlist_add(struct gfs2_sbd *sdp, struct gfs2_rgrp_list *rlist,
1433 struct gfs2_rgrpd *rgd;
1434 struct gfs2_rgrpd **tmp;
1435 unsigned int new_space;
1438 if (gfs2_assert_warn(sdp, !rlist->rl_ghs))
1441 rgd = gfs2_blk2rgrpd(sdp, block);
1443 if (gfs2_consist(sdp))
1444 fs_err(sdp, "block = %llu\n", (unsigned long long)block);
1448 for (x = 0; x < rlist->rl_rgrps; x++)
1449 if (rlist->rl_rgd[x] == rgd)
1452 if (rlist->rl_rgrps == rlist->rl_space) {
1453 new_space = rlist->rl_space + 10;
1455 tmp = kcalloc(new_space, sizeof(struct gfs2_rgrpd *),
1456 GFP_NOFS | __GFP_NOFAIL);
1458 if (rlist->rl_rgd) {
1459 memcpy(tmp, rlist->rl_rgd,
1460 rlist->rl_space * sizeof(struct gfs2_rgrpd *));
1461 kfree(rlist->rl_rgd);
1464 rlist->rl_space = new_space;
1465 rlist->rl_rgd = tmp;
1468 rlist->rl_rgd[rlist->rl_rgrps++] = rgd;
1472 * gfs2_rlist_alloc - all RGs have been added to the rlist, now allocate
1473 * and initialize an array of glock holders for them
1474 * @rlist: the list of resource groups
1475 * @state: the lock state to acquire the RG lock in
1476 * @flags: the modifier flags for the holder structures
1478 * FIXME: Don't use NOFAIL
1482 void gfs2_rlist_alloc(struct gfs2_rgrp_list *rlist, unsigned int state,
1487 rlist->rl_ghs = kcalloc(rlist->rl_rgrps, sizeof(struct gfs2_holder),
1488 GFP_NOFS | __GFP_NOFAIL);
1489 for (x = 0; x < rlist->rl_rgrps; x++)
1490 gfs2_holder_init(rlist->rl_rgd[x]->rd_gl,
1496 * gfs2_rlist_free - free a resource group list
1497 * @list: the list of resource groups
1501 void gfs2_rlist_free(struct gfs2_rgrp_list *rlist)
1505 kfree(rlist->rl_rgd);
1507 if (rlist->rl_ghs) {
1508 for (x = 0; x < rlist->rl_rgrps; x++)
1509 gfs2_holder_uninit(&rlist->rl_ghs[x]);
1510 kfree(rlist->rl_ghs);