v4.19.13 snapshot.
diff --git a/fs/ocfs2/suballoc.c b/fs/ocfs2/suballoc.c
new file mode 100644
index 0000000..f7c972f
--- /dev/null
+++ b/fs/ocfs2/suballoc.c
@@ -0,0 +1,2880 @@
+/* -*- mode: c; c-basic-offset: 8; -*-
+ * vim: noexpandtab sw=8 ts=8 sts=0:
+ *
+ * suballoc.c
+ *
+ * metadata alloc and free
+ * Inspired by ext3 block groups.
+ *
+ * Copyright (C) 2002, 2004 Oracle. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 021110-1307, USA.
+ */
+
+#include <linux/fs.h>
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <linux/highmem.h>
+
+#include <cluster/masklog.h>
+
+#include "ocfs2.h"
+
+#include "alloc.h"
+#include "blockcheck.h"
+#include "dlmglue.h"
+#include "inode.h"
+#include "journal.h"
+#include "localalloc.h"
+#include "suballoc.h"
+#include "super.h"
+#include "sysfile.h"
+#include "uptodate.h"
+#include "ocfs2_trace.h"
+
+#include "buffer_head_io.h"
+
+#define NOT_ALLOC_NEW_GROUP 0
+#define ALLOC_NEW_GROUP 0x1
+#define ALLOC_GROUPS_FROM_GLOBAL 0x2
+
+#define OCFS2_MAX_TO_STEAL 1024
+
+struct ocfs2_suballoc_result {
+ u64 sr_bg_blkno; /* The bg we allocated from. Set
+ to 0 when a block group is
+ contiguous. */
+ u64 sr_bg_stable_blkno; /*
+ * Doesn't change, always
+ * set to target block
+ * group descriptor
+ * block.
+ */
+ u64 sr_blkno; /* The first allocated block */
+ unsigned int sr_bit_offset; /* The bit in the bg */
+ unsigned int sr_bits; /* How many bits we claimed */
+};
+
+static u64 ocfs2_group_from_res(struct ocfs2_suballoc_result *res)
+{
+ if (res->sr_blkno == 0)
+ return 0;
+
+ if (res->sr_bg_blkno)
+ return res->sr_bg_blkno;
+
+ return ocfs2_which_suballoc_group(res->sr_blkno, res->sr_bit_offset);
+}
+
+static inline u16 ocfs2_find_victim_chain(struct ocfs2_chain_list *cl);
+static int ocfs2_block_group_fill(handle_t *handle,
+ struct inode *alloc_inode,
+ struct buffer_head *bg_bh,
+ u64 group_blkno,
+ unsigned int group_clusters,
+ u16 my_chain,
+ struct ocfs2_chain_list *cl);
+static int ocfs2_block_group_alloc(struct ocfs2_super *osb,
+ struct inode *alloc_inode,
+ struct buffer_head *bh,
+ u64 max_block,
+ u64 *last_alloc_group,
+ int flags);
+
+static int ocfs2_cluster_group_search(struct inode *inode,
+ struct buffer_head *group_bh,
+ u32 bits_wanted, u32 min_bits,
+ u64 max_block,
+ struct ocfs2_suballoc_result *res);
+static int ocfs2_block_group_search(struct inode *inode,
+ struct buffer_head *group_bh,
+ u32 bits_wanted, u32 min_bits,
+ u64 max_block,
+ struct ocfs2_suballoc_result *res);
+static int ocfs2_claim_suballoc_bits(struct ocfs2_alloc_context *ac,
+ handle_t *handle,
+ u32 bits_wanted,
+ u32 min_bits,
+ struct ocfs2_suballoc_result *res);
+static int ocfs2_test_bg_bit_allocatable(struct buffer_head *bg_bh,
+ int nr);
+static int ocfs2_relink_block_group(handle_t *handle,
+ struct inode *alloc_inode,
+ struct buffer_head *fe_bh,
+ struct buffer_head *bg_bh,
+ struct buffer_head *prev_bg_bh,
+ u16 chain);
+static inline int ocfs2_block_group_reasonably_empty(struct ocfs2_group_desc *bg,
+ u32 wanted);
+static inline u32 ocfs2_desc_bitmap_to_cluster_off(struct inode *inode,
+ u64 bg_blkno,
+ u16 bg_bit_off);
+static inline void ocfs2_block_to_cluster_group(struct inode *inode,
+ u64 data_blkno,
+ u64 *bg_blkno,
+ u16 *bg_bit_off);
+static int ocfs2_reserve_clusters_with_limit(struct ocfs2_super *osb,
+ u32 bits_wanted, u64 max_block,
+ int flags,
+ struct ocfs2_alloc_context **ac);
+
+void ocfs2_free_ac_resource(struct ocfs2_alloc_context *ac)
+{
+ struct inode *inode = ac->ac_inode;
+
+ if (inode) {
+ if (ac->ac_which != OCFS2_AC_USE_LOCAL)
+ ocfs2_inode_unlock(inode, 1);
+
+ inode_unlock(inode);
+
+ iput(inode);
+ ac->ac_inode = NULL;
+ }
+ brelse(ac->ac_bh);
+ ac->ac_bh = NULL;
+ ac->ac_resv = NULL;
+ kfree(ac->ac_find_loc_priv);
+ ac->ac_find_loc_priv = NULL;
+}
+
+void ocfs2_free_alloc_context(struct ocfs2_alloc_context *ac)
+{
+ ocfs2_free_ac_resource(ac);
+ kfree(ac);
+}
+
+static u32 ocfs2_bits_per_group(struct ocfs2_chain_list *cl)
+{
+ return (u32)le16_to_cpu(cl->cl_cpg) * (u32)le16_to_cpu(cl->cl_bpc);
+}
+
+#define do_error(fmt, ...) \
+do { \
+ if (resize) \
+ mlog(ML_ERROR, fmt, ##__VA_ARGS__); \
+ else \
+ return ocfs2_error(sb, fmt, ##__VA_ARGS__); \
+} while (0)
+
+static int ocfs2_validate_gd_self(struct super_block *sb,
+ struct buffer_head *bh,
+ int resize)
+{
+ struct ocfs2_group_desc *gd = (struct ocfs2_group_desc *)bh->b_data;
+
+ if (!OCFS2_IS_VALID_GROUP_DESC(gd)) {
+ do_error("Group descriptor #%llu has bad signature %.*s\n",
+ (unsigned long long)bh->b_blocknr, 7,
+ gd->bg_signature);
+ }
+
+ if (le64_to_cpu(gd->bg_blkno) != bh->b_blocknr) {
+ do_error("Group descriptor #%llu has an invalid bg_blkno of %llu\n",
+ (unsigned long long)bh->b_blocknr,
+ (unsigned long long)le64_to_cpu(gd->bg_blkno));
+ }
+
+ if (le32_to_cpu(gd->bg_generation) != OCFS2_SB(sb)->fs_generation) {
+ do_error("Group descriptor #%llu has an invalid fs_generation of #%u\n",
+ (unsigned long long)bh->b_blocknr,
+ le32_to_cpu(gd->bg_generation));
+ }
+
+ if (le16_to_cpu(gd->bg_free_bits_count) > le16_to_cpu(gd->bg_bits)) {
+ do_error("Group descriptor #%llu has bit count %u but claims that %u are free\n",
+ (unsigned long long)bh->b_blocknr,
+ le16_to_cpu(gd->bg_bits),
+ le16_to_cpu(gd->bg_free_bits_count));
+ }
+
+ if (le16_to_cpu(gd->bg_bits) > (8 * le16_to_cpu(gd->bg_size))) {
+ do_error("Group descriptor #%llu has bit count %u but max bitmap bits of %u\n",
+ (unsigned long long)bh->b_blocknr,
+ le16_to_cpu(gd->bg_bits),
+ 8 * le16_to_cpu(gd->bg_size));
+ }
+
+ return 0;
+}
+
+static int ocfs2_validate_gd_parent(struct super_block *sb,
+ struct ocfs2_dinode *di,
+ struct buffer_head *bh,
+ int resize)
+{
+ unsigned int max_bits;
+ struct ocfs2_group_desc *gd = (struct ocfs2_group_desc *)bh->b_data;
+
+ if (di->i_blkno != gd->bg_parent_dinode) {
+ do_error("Group descriptor #%llu has bad parent pointer (%llu, expected %llu)\n",
+ (unsigned long long)bh->b_blocknr,
+ (unsigned long long)le64_to_cpu(gd->bg_parent_dinode),
+ (unsigned long long)le64_to_cpu(di->i_blkno));
+ }
+
+ max_bits = le16_to_cpu(di->id2.i_chain.cl_cpg) * le16_to_cpu(di->id2.i_chain.cl_bpc);
+ if (le16_to_cpu(gd->bg_bits) > max_bits) {
+ do_error("Group descriptor #%llu has bit count of %u\n",
+ (unsigned long long)bh->b_blocknr,
+ le16_to_cpu(gd->bg_bits));
+ }
+
+ /* In resize, we may meet the case bg_chain == cl_next_free_rec. */
+ if ((le16_to_cpu(gd->bg_chain) >
+ le16_to_cpu(di->id2.i_chain.cl_next_free_rec)) ||
+ ((le16_to_cpu(gd->bg_chain) ==
+ le16_to_cpu(di->id2.i_chain.cl_next_free_rec)) && !resize)) {
+ do_error("Group descriptor #%llu has bad chain %u\n",
+ (unsigned long long)bh->b_blocknr,
+ le16_to_cpu(gd->bg_chain));
+ }
+
+ return 0;
+}
+
+#undef do_error
+
+/*
+ * This version only prints errors. It does not fail the filesystem, and
+ * exists only for resize.
+ */
+int ocfs2_check_group_descriptor(struct super_block *sb,
+ struct ocfs2_dinode *di,
+ struct buffer_head *bh)
+{
+ int rc;
+ struct ocfs2_group_desc *gd = (struct ocfs2_group_desc *)bh->b_data;
+
+ BUG_ON(!buffer_uptodate(bh));
+
+ /*
+ * If the ecc fails, we return the error but otherwise
+ * leave the filesystem running. We know any error is
+ * local to this block.
+ */
+ rc = ocfs2_validate_meta_ecc(sb, bh->b_data, &gd->bg_check);
+ if (rc) {
+ mlog(ML_ERROR,
+ "Checksum failed for group descriptor %llu\n",
+ (unsigned long long)bh->b_blocknr);
+ } else
+ rc = ocfs2_validate_gd_self(sb, bh, 1);
+ if (!rc)
+ rc = ocfs2_validate_gd_parent(sb, di, bh, 1);
+
+ return rc;
+}
+
+static int ocfs2_validate_group_descriptor(struct super_block *sb,
+ struct buffer_head *bh)
+{
+ int rc;
+ struct ocfs2_group_desc *gd = (struct ocfs2_group_desc *)bh->b_data;
+
+ trace_ocfs2_validate_group_descriptor(
+ (unsigned long long)bh->b_blocknr);
+
+ BUG_ON(!buffer_uptodate(bh));
+
+ /*
+ * If the ecc fails, we return the error but otherwise
+ * leave the filesystem running. We know any error is
+ * local to this block.
+ */
+ rc = ocfs2_validate_meta_ecc(sb, bh->b_data, &gd->bg_check);
+ if (rc)
+ return rc;
+
+ /*
+ * Errors after here are fatal.
+ */
+
+ return ocfs2_validate_gd_self(sb, bh, 0);
+}
+
+int ocfs2_read_group_descriptor(struct inode *inode, struct ocfs2_dinode *di,
+ u64 gd_blkno, struct buffer_head **bh)
+{
+ int rc;
+ struct buffer_head *tmp = *bh;
+
+ rc = ocfs2_read_block(INODE_CACHE(inode), gd_blkno, &tmp,
+ ocfs2_validate_group_descriptor);
+ if (rc)
+ goto out;
+
+ rc = ocfs2_validate_gd_parent(inode->i_sb, di, tmp, 0);
+ if (rc) {
+ brelse(tmp);
+ goto out;
+ }
+
+ /* If ocfs2_read_block() got us a new bh, pass it up. */
+ if (!*bh)
+ *bh = tmp;
+
+out:
+ return rc;
+}
+
+static void ocfs2_bg_discontig_add_extent(struct ocfs2_super *osb,
+ struct ocfs2_group_desc *bg,
+ struct ocfs2_chain_list *cl,
+ u64 p_blkno, unsigned int clusters)
+{
+ struct ocfs2_extent_list *el = &bg->bg_list;
+ struct ocfs2_extent_rec *rec;
+
+ BUG_ON(!ocfs2_supports_discontig_bg(osb));
+ if (!el->l_next_free_rec)
+ el->l_count = cpu_to_le16(ocfs2_extent_recs_per_gd(osb->sb));
+ rec = &el->l_recs[le16_to_cpu(el->l_next_free_rec)];
+ rec->e_blkno = cpu_to_le64(p_blkno);
+ rec->e_cpos = cpu_to_le32(le16_to_cpu(bg->bg_bits) /
+ le16_to_cpu(cl->cl_bpc));
+ rec->e_leaf_clusters = cpu_to_le16(clusters);
+ le16_add_cpu(&bg->bg_bits, clusters * le16_to_cpu(cl->cl_bpc));
+ le16_add_cpu(&bg->bg_free_bits_count,
+ clusters * le16_to_cpu(cl->cl_bpc));
+ le16_add_cpu(&el->l_next_free_rec, 1);
+}
+
+static int ocfs2_block_group_fill(handle_t *handle,
+ struct inode *alloc_inode,
+ struct buffer_head *bg_bh,
+ u64 group_blkno,
+ unsigned int group_clusters,
+ u16 my_chain,
+ struct ocfs2_chain_list *cl)
+{
+ int status = 0;
+ struct ocfs2_super *osb = OCFS2_SB(alloc_inode->i_sb);
+ struct ocfs2_group_desc *bg = (struct ocfs2_group_desc *) bg_bh->b_data;
+ struct super_block * sb = alloc_inode->i_sb;
+
+ if (((unsigned long long) bg_bh->b_blocknr) != group_blkno) {
+ status = ocfs2_error(alloc_inode->i_sb,
+ "group block (%llu) != b_blocknr (%llu)\n",
+ (unsigned long long)group_blkno,
+ (unsigned long long) bg_bh->b_blocknr);
+ goto bail;
+ }
+
+ status = ocfs2_journal_access_gd(handle,
+ INODE_CACHE(alloc_inode),
+ bg_bh,
+ OCFS2_JOURNAL_ACCESS_CREATE);
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail;
+ }
+
+ memset(bg, 0, sb->s_blocksize);
+ strcpy(bg->bg_signature, OCFS2_GROUP_DESC_SIGNATURE);
+ bg->bg_generation = cpu_to_le32(osb->fs_generation);
+ bg->bg_size = cpu_to_le16(ocfs2_group_bitmap_size(sb, 1,
+ osb->s_feature_incompat));
+ bg->bg_chain = cpu_to_le16(my_chain);
+ bg->bg_next_group = cl->cl_recs[my_chain].c_blkno;
+ bg->bg_parent_dinode = cpu_to_le64(OCFS2_I(alloc_inode)->ip_blkno);
+ bg->bg_blkno = cpu_to_le64(group_blkno);
+ if (group_clusters == le16_to_cpu(cl->cl_cpg))
+ bg->bg_bits = cpu_to_le16(ocfs2_bits_per_group(cl));
+ else
+ ocfs2_bg_discontig_add_extent(osb, bg, cl, group_blkno,
+ group_clusters);
+
+ /* set the 1st bit in the bitmap to account for the descriptor block */
+ ocfs2_set_bit(0, (unsigned long *)bg->bg_bitmap);
+ bg->bg_free_bits_count = cpu_to_le16(le16_to_cpu(bg->bg_bits) - 1);
+
+ ocfs2_journal_dirty(handle, bg_bh);
+
+ /* There is no need to zero out or otherwise initialize the
+ * other blocks in a group - All valid FS metadata in a block
+ * group stores the superblock fs_generation value at
+ * allocation time. */
+
+bail:
+ if (status)
+ mlog_errno(status);
+ return status;
+}
+
+static inline u16 ocfs2_find_smallest_chain(struct ocfs2_chain_list *cl)
+{
+ u16 curr, best;
+
+ best = curr = 0;
+ while (curr < le16_to_cpu(cl->cl_count)) {
+ if (le32_to_cpu(cl->cl_recs[best].c_total) >
+ le32_to_cpu(cl->cl_recs[curr].c_total))
+ best = curr;
+ curr++;
+ }
+ return best;
+}
+
+static struct buffer_head *
+ocfs2_block_group_alloc_contig(struct ocfs2_super *osb, handle_t *handle,
+ struct inode *alloc_inode,
+ struct ocfs2_alloc_context *ac,
+ struct ocfs2_chain_list *cl)
+{
+ int status;
+ u32 bit_off, num_bits;
+ u64 bg_blkno;
+ struct buffer_head *bg_bh;
+ unsigned int alloc_rec = ocfs2_find_smallest_chain(cl);
+
+ status = ocfs2_claim_clusters(handle, ac,
+ le16_to_cpu(cl->cl_cpg), &bit_off,
+ &num_bits);
+ if (status < 0) {
+ if (status != -ENOSPC)
+ mlog_errno(status);
+ goto bail;
+ }
+
+ /* setup the group */
+ bg_blkno = ocfs2_clusters_to_blocks(osb->sb, bit_off);
+ trace_ocfs2_block_group_alloc_contig(
+ (unsigned long long)bg_blkno, alloc_rec);
+
+ bg_bh = sb_getblk(osb->sb, bg_blkno);
+ if (!bg_bh) {
+ status = -ENOMEM;
+ mlog_errno(status);
+ goto bail;
+ }
+ ocfs2_set_new_buffer_uptodate(INODE_CACHE(alloc_inode), bg_bh);
+
+ status = ocfs2_block_group_fill(handle, alloc_inode, bg_bh,
+ bg_blkno, num_bits, alloc_rec, cl);
+ if (status < 0) {
+ brelse(bg_bh);
+ mlog_errno(status);
+ }
+
+bail:
+ return status ? ERR_PTR(status) : bg_bh;
+}
+
+static int ocfs2_block_group_claim_bits(struct ocfs2_super *osb,
+ handle_t *handle,
+ struct ocfs2_alloc_context *ac,
+ unsigned int min_bits,
+ u32 *bit_off, u32 *num_bits)
+{
+ int status = 0;
+
+ while (min_bits) {
+ status = ocfs2_claim_clusters(handle, ac, min_bits,
+ bit_off, num_bits);
+ if (status != -ENOSPC)
+ break;
+
+ min_bits >>= 1;
+ }
+
+ return status;
+}
+
+static int ocfs2_block_group_grow_discontig(handle_t *handle,
+ struct inode *alloc_inode,
+ struct buffer_head *bg_bh,
+ struct ocfs2_alloc_context *ac,
+ struct ocfs2_chain_list *cl,
+ unsigned int min_bits)
+{
+ int status;
+ struct ocfs2_super *osb = OCFS2_SB(alloc_inode->i_sb);
+ struct ocfs2_group_desc *bg =
+ (struct ocfs2_group_desc *)bg_bh->b_data;
+ unsigned int needed = le16_to_cpu(cl->cl_cpg) -
+ le16_to_cpu(bg->bg_bits) / le16_to_cpu(cl->cl_bpc);
+ u32 p_cpos, clusters;
+ u64 p_blkno;
+ struct ocfs2_extent_list *el = &bg->bg_list;
+
+ status = ocfs2_journal_access_gd(handle,
+ INODE_CACHE(alloc_inode),
+ bg_bh,
+ OCFS2_JOURNAL_ACCESS_CREATE);
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail;
+ }
+
+ while ((needed > 0) && (le16_to_cpu(el->l_next_free_rec) <
+ le16_to_cpu(el->l_count))) {
+ if (min_bits > needed)
+ min_bits = needed;
+ status = ocfs2_block_group_claim_bits(osb, handle, ac,
+ min_bits, &p_cpos,
+ &clusters);
+ if (status < 0) {
+ if (status != -ENOSPC)
+ mlog_errno(status);
+ goto bail;
+ }
+ p_blkno = ocfs2_clusters_to_blocks(osb->sb, p_cpos);
+ ocfs2_bg_discontig_add_extent(osb, bg, cl, p_blkno,
+ clusters);
+
+ min_bits = clusters;
+ needed = le16_to_cpu(cl->cl_cpg) -
+ le16_to_cpu(bg->bg_bits) / le16_to_cpu(cl->cl_bpc);
+ }
+
+ if (needed > 0) {
+ /*
+ * We have used up all the extent rec but can't fill up
+ * the cpg. So bail out.
+ */
+ status = -ENOSPC;
+ goto bail;
+ }
+
+ ocfs2_journal_dirty(handle, bg_bh);
+
+bail:
+ return status;
+}
+
+static void ocfs2_bg_alloc_cleanup(handle_t *handle,
+ struct ocfs2_alloc_context *cluster_ac,
+ struct inode *alloc_inode,
+ struct buffer_head *bg_bh)
+{
+ int i, ret;
+ struct ocfs2_group_desc *bg;
+ struct ocfs2_extent_list *el;
+ struct ocfs2_extent_rec *rec;
+
+ if (!bg_bh)
+ return;
+
+ bg = (struct ocfs2_group_desc *)bg_bh->b_data;
+ el = &bg->bg_list;
+ for (i = 0; i < le16_to_cpu(el->l_next_free_rec); i++) {
+ rec = &el->l_recs[i];
+ ret = ocfs2_free_clusters(handle, cluster_ac->ac_inode,
+ cluster_ac->ac_bh,
+ le64_to_cpu(rec->e_blkno),
+ le16_to_cpu(rec->e_leaf_clusters));
+ if (ret)
+ mlog_errno(ret);
+ /* Try all the clusters to free */
+ }
+
+ ocfs2_remove_from_cache(INODE_CACHE(alloc_inode), bg_bh);
+ brelse(bg_bh);
+}
+
+static struct buffer_head *
+ocfs2_block_group_alloc_discontig(handle_t *handle,
+ struct inode *alloc_inode,
+ struct ocfs2_alloc_context *ac,
+ struct ocfs2_chain_list *cl)
+{
+ int status;
+ u32 bit_off, num_bits;
+ u64 bg_blkno;
+ unsigned int min_bits = le16_to_cpu(cl->cl_cpg) >> 1;
+ struct buffer_head *bg_bh = NULL;
+ unsigned int alloc_rec = ocfs2_find_smallest_chain(cl);
+ struct ocfs2_super *osb = OCFS2_SB(alloc_inode->i_sb);
+
+ if (!ocfs2_supports_discontig_bg(osb)) {
+ status = -ENOSPC;
+ goto bail;
+ }
+
+ status = ocfs2_extend_trans(handle,
+ ocfs2_calc_bg_discontig_credits(osb->sb));
+ if (status) {
+ mlog_errno(status);
+ goto bail;
+ }
+
+ /*
+ * We're going to be grabbing from multiple cluster groups.
+ * We don't have enough credits to relink them all, and the
+ * cluster groups will be staying in cache for the duration of
+ * this operation.
+ */
+ ac->ac_disable_chain_relink = 1;
+
+ /* Claim the first region */
+ status = ocfs2_block_group_claim_bits(osb, handle, ac, min_bits,
+ &bit_off, &num_bits);
+ if (status < 0) {
+ if (status != -ENOSPC)
+ mlog_errno(status);
+ goto bail;
+ }
+ min_bits = num_bits;
+
+ /* setup the group */
+ bg_blkno = ocfs2_clusters_to_blocks(osb->sb, bit_off);
+ trace_ocfs2_block_group_alloc_discontig(
+ (unsigned long long)bg_blkno, alloc_rec);
+
+ bg_bh = sb_getblk(osb->sb, bg_blkno);
+ if (!bg_bh) {
+ status = -ENOMEM;
+ mlog_errno(status);
+ goto bail;
+ }
+ ocfs2_set_new_buffer_uptodate(INODE_CACHE(alloc_inode), bg_bh);
+
+ status = ocfs2_block_group_fill(handle, alloc_inode, bg_bh,
+ bg_blkno, num_bits, alloc_rec, cl);
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail;
+ }
+
+ status = ocfs2_block_group_grow_discontig(handle, alloc_inode,
+ bg_bh, ac, cl, min_bits);
+ if (status)
+ mlog_errno(status);
+
+bail:
+ if (status)
+ ocfs2_bg_alloc_cleanup(handle, ac, alloc_inode, bg_bh);
+ return status ? ERR_PTR(status) : bg_bh;
+}
+
+/*
+ * We expect the block group allocator to already be locked.
+ */
+static int ocfs2_block_group_alloc(struct ocfs2_super *osb,
+ struct inode *alloc_inode,
+ struct buffer_head *bh,
+ u64 max_block,
+ u64 *last_alloc_group,
+ int flags)
+{
+ int status, credits;
+ struct ocfs2_dinode *fe = (struct ocfs2_dinode *) bh->b_data;
+ struct ocfs2_chain_list *cl;
+ struct ocfs2_alloc_context *ac = NULL;
+ handle_t *handle = NULL;
+ u16 alloc_rec;
+ struct buffer_head *bg_bh = NULL;
+ struct ocfs2_group_desc *bg;
+
+ BUG_ON(ocfs2_is_cluster_bitmap(alloc_inode));
+
+ cl = &fe->id2.i_chain;
+ status = ocfs2_reserve_clusters_with_limit(osb,
+ le16_to_cpu(cl->cl_cpg),
+ max_block, flags, &ac);
+ if (status < 0) {
+ if (status != -ENOSPC)
+ mlog_errno(status);
+ goto bail;
+ }
+
+ credits = ocfs2_calc_group_alloc_credits(osb->sb,
+ le16_to_cpu(cl->cl_cpg));
+ handle = ocfs2_start_trans(osb, credits);
+ if (IS_ERR(handle)) {
+ status = PTR_ERR(handle);
+ handle = NULL;
+ mlog_errno(status);
+ goto bail;
+ }
+
+ if (last_alloc_group && *last_alloc_group != 0) {
+ trace_ocfs2_block_group_alloc(
+ (unsigned long long)*last_alloc_group);
+ ac->ac_last_group = *last_alloc_group;
+ }
+
+ bg_bh = ocfs2_block_group_alloc_contig(osb, handle, alloc_inode,
+ ac, cl);
+ if (IS_ERR(bg_bh) && (PTR_ERR(bg_bh) == -ENOSPC))
+ bg_bh = ocfs2_block_group_alloc_discontig(handle,
+ alloc_inode,
+ ac, cl);
+ if (IS_ERR(bg_bh)) {
+ status = PTR_ERR(bg_bh);
+ bg_bh = NULL;
+ if (status != -ENOSPC)
+ mlog_errno(status);
+ goto bail;
+ }
+ bg = (struct ocfs2_group_desc *) bg_bh->b_data;
+
+ status = ocfs2_journal_access_di(handle, INODE_CACHE(alloc_inode),
+ bh, OCFS2_JOURNAL_ACCESS_WRITE);
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail;
+ }
+
+ alloc_rec = le16_to_cpu(bg->bg_chain);
+ le32_add_cpu(&cl->cl_recs[alloc_rec].c_free,
+ le16_to_cpu(bg->bg_free_bits_count));
+ le32_add_cpu(&cl->cl_recs[alloc_rec].c_total,
+ le16_to_cpu(bg->bg_bits));
+ cl->cl_recs[alloc_rec].c_blkno = bg->bg_blkno;
+ if (le16_to_cpu(cl->cl_next_free_rec) < le16_to_cpu(cl->cl_count))
+ le16_add_cpu(&cl->cl_next_free_rec, 1);
+
+ le32_add_cpu(&fe->id1.bitmap1.i_used, le16_to_cpu(bg->bg_bits) -
+ le16_to_cpu(bg->bg_free_bits_count));
+ le32_add_cpu(&fe->id1.bitmap1.i_total, le16_to_cpu(bg->bg_bits));
+ le32_add_cpu(&fe->i_clusters, le16_to_cpu(cl->cl_cpg));
+
+ ocfs2_journal_dirty(handle, bh);
+
+ spin_lock(&OCFS2_I(alloc_inode)->ip_lock);
+ OCFS2_I(alloc_inode)->ip_clusters = le32_to_cpu(fe->i_clusters);
+ fe->i_size = cpu_to_le64(ocfs2_clusters_to_bytes(alloc_inode->i_sb,
+ le32_to_cpu(fe->i_clusters)));
+ spin_unlock(&OCFS2_I(alloc_inode)->ip_lock);
+ i_size_write(alloc_inode, le64_to_cpu(fe->i_size));
+ alloc_inode->i_blocks = ocfs2_inode_sector_count(alloc_inode);
+ ocfs2_update_inode_fsync_trans(handle, alloc_inode, 0);
+
+ status = 0;
+
+ /* save the new last alloc group so that the caller can cache it. */
+ if (last_alloc_group)
+ *last_alloc_group = ac->ac_last_group;
+
+bail:
+ if (handle)
+ ocfs2_commit_trans(osb, handle);
+
+ if (ac)
+ ocfs2_free_alloc_context(ac);
+
+ brelse(bg_bh);
+
+ if (status)
+ mlog_errno(status);
+ return status;
+}
+
+static int ocfs2_reserve_suballoc_bits(struct ocfs2_super *osb,
+ struct ocfs2_alloc_context *ac,
+ int type,
+ u32 slot,
+ u64 *last_alloc_group,
+ int flags)
+{
+ int status;
+ u32 bits_wanted = ac->ac_bits_wanted;
+ struct inode *alloc_inode;
+ struct buffer_head *bh = NULL;
+ struct ocfs2_dinode *fe;
+ u32 free_bits;
+
+ alloc_inode = ocfs2_get_system_file_inode(osb, type, slot);
+ if (!alloc_inode) {
+ mlog_errno(-EINVAL);
+ return -EINVAL;
+ }
+
+ inode_lock(alloc_inode);
+
+ status = ocfs2_inode_lock(alloc_inode, &bh, 1);
+ if (status < 0) {
+ inode_unlock(alloc_inode);
+ iput(alloc_inode);
+
+ mlog_errno(status);
+ return status;
+ }
+
+ ac->ac_inode = alloc_inode;
+ ac->ac_alloc_slot = slot;
+
+ fe = (struct ocfs2_dinode *) bh->b_data;
+
+ /* The bh was validated by the inode read inside
+ * ocfs2_inode_lock(). Any corruption is a code bug. */
+ BUG_ON(!OCFS2_IS_VALID_DINODE(fe));
+
+ if (!(fe->i_flags & cpu_to_le32(OCFS2_CHAIN_FL))) {
+ status = ocfs2_error(alloc_inode->i_sb,
+ "Invalid chain allocator %llu\n",
+ (unsigned long long)le64_to_cpu(fe->i_blkno));
+ goto bail;
+ }
+
+ free_bits = le32_to_cpu(fe->id1.bitmap1.i_total) -
+ le32_to_cpu(fe->id1.bitmap1.i_used);
+
+ if (bits_wanted > free_bits) {
+ /* cluster bitmap never grows */
+ if (ocfs2_is_cluster_bitmap(alloc_inode)) {
+ trace_ocfs2_reserve_suballoc_bits_nospc(bits_wanted,
+ free_bits);
+ status = -ENOSPC;
+ goto bail;
+ }
+
+ if (!(flags & ALLOC_NEW_GROUP)) {
+ trace_ocfs2_reserve_suballoc_bits_no_new_group(
+ slot, bits_wanted, free_bits);
+ status = -ENOSPC;
+ goto bail;
+ }
+
+ status = ocfs2_block_group_alloc(osb, alloc_inode, bh,
+ ac->ac_max_block,
+ last_alloc_group, flags);
+ if (status < 0) {
+ if (status != -ENOSPC)
+ mlog_errno(status);
+ goto bail;
+ }
+ atomic_inc(&osb->alloc_stats.bg_extends);
+
+ /* You should never ask for this much metadata */
+ BUG_ON(bits_wanted >
+ (le32_to_cpu(fe->id1.bitmap1.i_total)
+ - le32_to_cpu(fe->id1.bitmap1.i_used)));
+ }
+
+ get_bh(bh);
+ ac->ac_bh = bh;
+bail:
+ brelse(bh);
+
+ if (status)
+ mlog_errno(status);
+ return status;
+}
+
+static void ocfs2_init_inode_steal_slot(struct ocfs2_super *osb)
+{
+ spin_lock(&osb->osb_lock);
+ osb->s_inode_steal_slot = OCFS2_INVALID_SLOT;
+ spin_unlock(&osb->osb_lock);
+ atomic_set(&osb->s_num_inodes_stolen, 0);
+}
+
+static void ocfs2_init_meta_steal_slot(struct ocfs2_super *osb)
+{
+ spin_lock(&osb->osb_lock);
+ osb->s_meta_steal_slot = OCFS2_INVALID_SLOT;
+ spin_unlock(&osb->osb_lock);
+ atomic_set(&osb->s_num_meta_stolen, 0);
+}
+
+void ocfs2_init_steal_slots(struct ocfs2_super *osb)
+{
+ ocfs2_init_inode_steal_slot(osb);
+ ocfs2_init_meta_steal_slot(osb);
+}
+
+static void __ocfs2_set_steal_slot(struct ocfs2_super *osb, int slot, int type)
+{
+ spin_lock(&osb->osb_lock);
+ if (type == INODE_ALLOC_SYSTEM_INODE)
+ osb->s_inode_steal_slot = slot;
+ else if (type == EXTENT_ALLOC_SYSTEM_INODE)
+ osb->s_meta_steal_slot = slot;
+ spin_unlock(&osb->osb_lock);
+}
+
+static int __ocfs2_get_steal_slot(struct ocfs2_super *osb, int type)
+{
+ int slot = OCFS2_INVALID_SLOT;
+
+ spin_lock(&osb->osb_lock);
+ if (type == INODE_ALLOC_SYSTEM_INODE)
+ slot = osb->s_inode_steal_slot;
+ else if (type == EXTENT_ALLOC_SYSTEM_INODE)
+ slot = osb->s_meta_steal_slot;
+ spin_unlock(&osb->osb_lock);
+
+ return slot;
+}
+
+static int ocfs2_get_inode_steal_slot(struct ocfs2_super *osb)
+{
+ return __ocfs2_get_steal_slot(osb, INODE_ALLOC_SYSTEM_INODE);
+}
+
+static int ocfs2_get_meta_steal_slot(struct ocfs2_super *osb)
+{
+ return __ocfs2_get_steal_slot(osb, EXTENT_ALLOC_SYSTEM_INODE);
+}
+
+static int ocfs2_steal_resource(struct ocfs2_super *osb,
+ struct ocfs2_alloc_context *ac,
+ int type)
+{
+ int i, status = -ENOSPC;
+ int slot = __ocfs2_get_steal_slot(osb, type);
+
+ /* Start to steal resource from the first slot after ours. */
+ if (slot == OCFS2_INVALID_SLOT)
+ slot = osb->slot_num + 1;
+
+ for (i = 0; i < osb->max_slots; i++, slot++) {
+ if (slot == osb->max_slots)
+ slot = 0;
+
+ if (slot == osb->slot_num)
+ continue;
+
+ status = ocfs2_reserve_suballoc_bits(osb, ac,
+ type,
+ (u32)slot, NULL,
+ NOT_ALLOC_NEW_GROUP);
+ if (status >= 0) {
+ __ocfs2_set_steal_slot(osb, slot, type);
+ break;
+ }
+
+ ocfs2_free_ac_resource(ac);
+ }
+
+ return status;
+}
+
+static int ocfs2_steal_inode(struct ocfs2_super *osb,
+ struct ocfs2_alloc_context *ac)
+{
+ return ocfs2_steal_resource(osb, ac, INODE_ALLOC_SYSTEM_INODE);
+}
+
+static int ocfs2_steal_meta(struct ocfs2_super *osb,
+ struct ocfs2_alloc_context *ac)
+{
+ return ocfs2_steal_resource(osb, ac, EXTENT_ALLOC_SYSTEM_INODE);
+}
+
+int ocfs2_reserve_new_metadata_blocks(struct ocfs2_super *osb,
+ int blocks,
+ struct ocfs2_alloc_context **ac)
+{
+ int status;
+ int slot = ocfs2_get_meta_steal_slot(osb);
+
+ *ac = kzalloc(sizeof(struct ocfs2_alloc_context), GFP_KERNEL);
+ if (!(*ac)) {
+ status = -ENOMEM;
+ mlog_errno(status);
+ goto bail;
+ }
+
+ (*ac)->ac_bits_wanted = blocks;
+ (*ac)->ac_which = OCFS2_AC_USE_META;
+ (*ac)->ac_group_search = ocfs2_block_group_search;
+
+ if (slot != OCFS2_INVALID_SLOT &&
+ atomic_read(&osb->s_num_meta_stolen) < OCFS2_MAX_TO_STEAL)
+ goto extent_steal;
+
+ atomic_set(&osb->s_num_meta_stolen, 0);
+ status = ocfs2_reserve_suballoc_bits(osb, (*ac),
+ EXTENT_ALLOC_SYSTEM_INODE,
+ (u32)osb->slot_num, NULL,
+ ALLOC_GROUPS_FROM_GLOBAL|ALLOC_NEW_GROUP);
+
+
+ if (status >= 0) {
+ status = 0;
+ if (slot != OCFS2_INVALID_SLOT)
+ ocfs2_init_meta_steal_slot(osb);
+ goto bail;
+ } else if (status < 0 && status != -ENOSPC) {
+ mlog_errno(status);
+ goto bail;
+ }
+
+ ocfs2_free_ac_resource(*ac);
+
+extent_steal:
+ status = ocfs2_steal_meta(osb, *ac);
+ atomic_inc(&osb->s_num_meta_stolen);
+ if (status < 0) {
+ if (status != -ENOSPC)
+ mlog_errno(status);
+ goto bail;
+ }
+
+ status = 0;
+bail:
+ if ((status < 0) && *ac) {
+ ocfs2_free_alloc_context(*ac);
+ *ac = NULL;
+ }
+
+ if (status)
+ mlog_errno(status);
+ return status;
+}
+
+int ocfs2_reserve_new_metadata(struct ocfs2_super *osb,
+ struct ocfs2_extent_list *root_el,
+ struct ocfs2_alloc_context **ac)
+{
+ return ocfs2_reserve_new_metadata_blocks(osb,
+ ocfs2_extend_meta_needed(root_el),
+ ac);
+}
+
+int ocfs2_reserve_new_inode(struct ocfs2_super *osb,
+ struct ocfs2_alloc_context **ac)
+{
+ int status;
+ int slot = ocfs2_get_inode_steal_slot(osb);
+ u64 alloc_group;
+
+ *ac = kzalloc(sizeof(struct ocfs2_alloc_context), GFP_KERNEL);
+ if (!(*ac)) {
+ status = -ENOMEM;
+ mlog_errno(status);
+ goto bail;
+ }
+
+ (*ac)->ac_bits_wanted = 1;
+ (*ac)->ac_which = OCFS2_AC_USE_INODE;
+
+ (*ac)->ac_group_search = ocfs2_block_group_search;
+
+ /*
+ * stat(2) can't handle i_ino > 32bits, so we tell the
+ * lower levels not to allocate us a block group past that
+ * limit. The 'inode64' mount option avoids this behavior.
+ */
+ if (!(osb->s_mount_opt & OCFS2_MOUNT_INODE64))
+ (*ac)->ac_max_block = (u32)~0U;
+
+ /*
+ * slot is set when we successfully steal inode from other nodes.
+ * It is reset in 3 places:
+ * 1. when we flush the truncate log
+ * 2. when we complete local alloc recovery.
+ * 3. when we successfully allocate from our own slot.
+ * After it is set, we will go on stealing inodes until we find the
+ * need to check our slots to see whether there is some space for us.
+ */
+ if (slot != OCFS2_INVALID_SLOT &&
+ atomic_read(&osb->s_num_inodes_stolen) < OCFS2_MAX_TO_STEAL)
+ goto inode_steal;
+
+ atomic_set(&osb->s_num_inodes_stolen, 0);
+ alloc_group = osb->osb_inode_alloc_group;
+ status = ocfs2_reserve_suballoc_bits(osb, *ac,
+ INODE_ALLOC_SYSTEM_INODE,
+ (u32)osb->slot_num,
+ &alloc_group,
+ ALLOC_NEW_GROUP |
+ ALLOC_GROUPS_FROM_GLOBAL);
+ if (status >= 0) {
+ status = 0;
+
+ spin_lock(&osb->osb_lock);
+ osb->osb_inode_alloc_group = alloc_group;
+ spin_unlock(&osb->osb_lock);
+ trace_ocfs2_reserve_new_inode_new_group(
+ (unsigned long long)alloc_group);
+
+ /*
+ * Some inodes must be freed by us, so try to allocate
+ * from our own next time.
+ */
+ if (slot != OCFS2_INVALID_SLOT)
+ ocfs2_init_inode_steal_slot(osb);
+ goto bail;
+ } else if (status < 0 && status != -ENOSPC) {
+ mlog_errno(status);
+ goto bail;
+ }
+
+ ocfs2_free_ac_resource(*ac);
+
+inode_steal:
+ status = ocfs2_steal_inode(osb, *ac);
+ atomic_inc(&osb->s_num_inodes_stolen);
+ if (status < 0) {
+ if (status != -ENOSPC)
+ mlog_errno(status);
+ goto bail;
+ }
+
+ status = 0;
+bail:
+ if ((status < 0) && *ac) {
+ ocfs2_free_alloc_context(*ac);
+ *ac = NULL;
+ }
+
+ if (status)
+ mlog_errno(status);
+ return status;
+}
+
+/* local alloc code has to do the same thing, so rather than do this
+ * twice.. */
+int ocfs2_reserve_cluster_bitmap_bits(struct ocfs2_super *osb,
+ struct ocfs2_alloc_context *ac)
+{
+ int status;
+
+ ac->ac_which = OCFS2_AC_USE_MAIN;
+ ac->ac_group_search = ocfs2_cluster_group_search;
+
+ status = ocfs2_reserve_suballoc_bits(osb, ac,
+ GLOBAL_BITMAP_SYSTEM_INODE,
+ OCFS2_INVALID_SLOT, NULL,
+ ALLOC_NEW_GROUP);
+ if (status < 0 && status != -ENOSPC)
+ mlog_errno(status);
+
+ return status;
+}
+
+/* Callers don't need to care which bitmap (local alloc or main) to
+ * use so we figure it out for them, but unfortunately this clutters
+ * things a bit. */
+static int ocfs2_reserve_clusters_with_limit(struct ocfs2_super *osb,
+ u32 bits_wanted, u64 max_block,
+ int flags,
+ struct ocfs2_alloc_context **ac)
+{
+ int status, ret = 0;
+ int retried = 0;
+
+ *ac = kzalloc(sizeof(struct ocfs2_alloc_context), GFP_KERNEL);
+ if (!(*ac)) {
+ status = -ENOMEM;
+ mlog_errno(status);
+ goto bail;
+ }
+
+ (*ac)->ac_bits_wanted = bits_wanted;
+ (*ac)->ac_max_block = max_block;
+
+ status = -ENOSPC;
+ if (!(flags & ALLOC_GROUPS_FROM_GLOBAL) &&
+ ocfs2_alloc_should_use_local(osb, bits_wanted)) {
+ status = ocfs2_reserve_local_alloc_bits(osb,
+ bits_wanted,
+ *ac);
+ if ((status < 0) && (status != -ENOSPC)) {
+ mlog_errno(status);
+ goto bail;
+ }
+ }
+
+ if (status == -ENOSPC) {
+retry:
+ status = ocfs2_reserve_cluster_bitmap_bits(osb, *ac);
+ /* Retry if there is sufficient space cached in truncate log */
+ if (status == -ENOSPC && !retried) {
+ retried = 1;
+ ocfs2_inode_unlock((*ac)->ac_inode, 1);
+ inode_unlock((*ac)->ac_inode);
+
+ ret = ocfs2_try_to_free_truncate_log(osb, bits_wanted);
+ if (ret == 1) {
+ iput((*ac)->ac_inode);
+ (*ac)->ac_inode = NULL;
+ goto retry;
+ }
+
+ if (ret < 0)
+ mlog_errno(ret);
+
+ inode_lock((*ac)->ac_inode);
+ ret = ocfs2_inode_lock((*ac)->ac_inode, NULL, 1);
+ if (ret < 0) {
+ mlog_errno(ret);
+ inode_unlock((*ac)->ac_inode);
+ iput((*ac)->ac_inode);
+ (*ac)->ac_inode = NULL;
+ goto bail;
+ }
+ }
+ if (status < 0) {
+ if (status != -ENOSPC)
+ mlog_errno(status);
+ goto bail;
+ }
+ }
+
+ status = 0;
+bail:
+ if ((status < 0) && *ac) {
+ ocfs2_free_alloc_context(*ac);
+ *ac = NULL;
+ }
+
+ if (status)
+ mlog_errno(status);
+ return status;
+}
+
+int ocfs2_reserve_clusters(struct ocfs2_super *osb,
+ u32 bits_wanted,
+ struct ocfs2_alloc_context **ac)
+{
+ return ocfs2_reserve_clusters_with_limit(osb, bits_wanted, 0,
+ ALLOC_NEW_GROUP, ac);
+}
+
+/*
+ * More or less lifted from ext3. I'll leave their description below:
+ *
+ * "For ext3 allocations, we must not reuse any blocks which are
+ * allocated in the bitmap buffer's "last committed data" copy. This
+ * prevents deletes from freeing up the page for reuse until we have
+ * committed the delete transaction.
+ *
+ * If we didn't do this, then deleting something and reallocating it as
+ * data would allow the old block to be overwritten before the
+ * transaction committed (because we force data to disk before commit).
+ * This would lead to corruption if we crashed between overwriting the
+ * data and committing the delete.
+ *
+ * @@@ We may want to make this allocation behaviour conditional on
+ * data-writes at some point, and disable it for metadata allocations or
+ * sync-data inodes."
+ *
+ * Note: OCFS2 already does this differently for metadata vs data
+ * allocations, as those bitmaps are separate and undo access is never
+ * called on a metadata group descriptor.
+ */
+static int ocfs2_test_bg_bit_allocatable(struct buffer_head *bg_bh,
+ int nr)
+{
+ struct ocfs2_group_desc *bg = (struct ocfs2_group_desc *) bg_bh->b_data;
+ int ret;
+
+ if (ocfs2_test_bit(nr, (unsigned long *)bg->bg_bitmap))
+ return 0;
+
+ if (!buffer_jbd(bg_bh))
+ return 1;
+
+ jbd_lock_bh_state(bg_bh);
+ bg = (struct ocfs2_group_desc *) bh2jh(bg_bh)->b_committed_data;
+ if (bg)
+ ret = !ocfs2_test_bit(nr, (unsigned long *)bg->bg_bitmap);
+ else
+ ret = 1;
+ jbd_unlock_bh_state(bg_bh);
+
+ return ret;
+}
+
+static int ocfs2_block_group_find_clear_bits(struct ocfs2_super *osb,
+ struct buffer_head *bg_bh,
+ unsigned int bits_wanted,
+ unsigned int total_bits,
+ struct ocfs2_suballoc_result *res)
+{
+ void *bitmap;
+ u16 best_offset, best_size;
+ int offset, start, found, status = 0;
+ struct ocfs2_group_desc *bg = (struct ocfs2_group_desc *) bg_bh->b_data;
+
+ /* Callers got this descriptor from
+ * ocfs2_read_group_descriptor(). Any corruption is a code bug. */
+ BUG_ON(!OCFS2_IS_VALID_GROUP_DESC(bg));
+
+ found = start = best_offset = best_size = 0;
+ bitmap = bg->bg_bitmap;
+
+ while((offset = ocfs2_find_next_zero_bit(bitmap, total_bits, start)) != -1) {
+ if (offset == total_bits)
+ break;
+
+ if (!ocfs2_test_bg_bit_allocatable(bg_bh, offset)) {
+ /* We found a zero, but we can't use it as it
+ * hasn't been put to disk yet! */
+ found = 0;
+ start = offset + 1;
+ } else if (offset == start) {
+ /* we found a zero */
+ found++;
+ /* move start to the next bit to test */
+ start++;
+ } else {
+ /* got a zero after some ones */
+ found = 1;
+ start = offset + 1;
+ }
+ if (found > best_size) {
+ best_size = found;
+ best_offset = start - found;
+ }
+ /* we got everything we needed */
+ if (found == bits_wanted) {
+ /* mlog(0, "Found it all!\n"); */
+ break;
+ }
+ }
+
+ if (best_size) {
+ res->sr_bit_offset = best_offset;
+ res->sr_bits = best_size;
+ } else {
+ status = -ENOSPC;
+ /* No error log here -- see the comment above
+ * ocfs2_test_bg_bit_allocatable */
+ }
+
+ return status;
+}
+
+int ocfs2_block_group_set_bits(handle_t *handle,
+ struct inode *alloc_inode,
+ struct ocfs2_group_desc *bg,
+ struct buffer_head *group_bh,
+ unsigned int bit_off,
+ unsigned int num_bits)
+{
+ int status;
+ void *bitmap = bg->bg_bitmap;
+ int journal_type = OCFS2_JOURNAL_ACCESS_WRITE;
+
+ /* All callers get the descriptor via
+ * ocfs2_read_group_descriptor(). Any corruption is a code bug. */
+ BUG_ON(!OCFS2_IS_VALID_GROUP_DESC(bg));
+ BUG_ON(le16_to_cpu(bg->bg_free_bits_count) < num_bits);
+
+ trace_ocfs2_block_group_set_bits(bit_off, num_bits);
+
+ if (ocfs2_is_cluster_bitmap(alloc_inode))
+ journal_type = OCFS2_JOURNAL_ACCESS_UNDO;
+
+ status = ocfs2_journal_access_gd(handle,
+ INODE_CACHE(alloc_inode),
+ group_bh,
+ journal_type);
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail;
+ }
+
+ le16_add_cpu(&bg->bg_free_bits_count, -num_bits);
+ if (le16_to_cpu(bg->bg_free_bits_count) > le16_to_cpu(bg->bg_bits)) {
+ return ocfs2_error(alloc_inode->i_sb, "Group descriptor # %llu has bit count %u but claims %u are freed. num_bits %d\n",
+ (unsigned long long)le64_to_cpu(bg->bg_blkno),
+ le16_to_cpu(bg->bg_bits),
+ le16_to_cpu(bg->bg_free_bits_count),
+ num_bits);
+ }
+ while(num_bits--)
+ ocfs2_set_bit(bit_off++, bitmap);
+
+ ocfs2_journal_dirty(handle, group_bh);
+
+bail:
+ return status;
+}
+
+/* find the one with the most empty bits */
+static inline u16 ocfs2_find_victim_chain(struct ocfs2_chain_list *cl)
+{
+ u16 curr, best;
+
+ BUG_ON(!cl->cl_next_free_rec);
+
+ best = curr = 0;
+ while (curr < le16_to_cpu(cl->cl_next_free_rec)) {
+ if (le32_to_cpu(cl->cl_recs[curr].c_free) >
+ le32_to_cpu(cl->cl_recs[best].c_free))
+ best = curr;
+ curr++;
+ }
+
+ BUG_ON(best >= le16_to_cpu(cl->cl_next_free_rec));
+ return best;
+}
+
+static int ocfs2_relink_block_group(handle_t *handle,
+ struct inode *alloc_inode,
+ struct buffer_head *fe_bh,
+ struct buffer_head *bg_bh,
+ struct buffer_head *prev_bg_bh,
+ u16 chain)
+{
+ int status;
+ /* there is a really tiny chance the journal calls could fail,
+ * but we wouldn't want inconsistent blocks in *any* case. */
+ u64 bg_ptr, prev_bg_ptr;
+ struct ocfs2_dinode *fe = (struct ocfs2_dinode *) fe_bh->b_data;
+ struct ocfs2_group_desc *bg = (struct ocfs2_group_desc *) bg_bh->b_data;
+ struct ocfs2_group_desc *prev_bg = (struct ocfs2_group_desc *) prev_bg_bh->b_data;
+
+ /* The caller got these descriptors from
+ * ocfs2_read_group_descriptor(). Any corruption is a code bug. */
+ BUG_ON(!OCFS2_IS_VALID_GROUP_DESC(bg));
+ BUG_ON(!OCFS2_IS_VALID_GROUP_DESC(prev_bg));
+
+ trace_ocfs2_relink_block_group(
+ (unsigned long long)le64_to_cpu(fe->i_blkno), chain,
+ (unsigned long long)le64_to_cpu(bg->bg_blkno),
+ (unsigned long long)le64_to_cpu(prev_bg->bg_blkno));
+
+ bg_ptr = le64_to_cpu(bg->bg_next_group);
+ prev_bg_ptr = le64_to_cpu(prev_bg->bg_next_group);
+
+ status = ocfs2_journal_access_gd(handle, INODE_CACHE(alloc_inode),
+ prev_bg_bh,
+ OCFS2_JOURNAL_ACCESS_WRITE);
+ if (status < 0)
+ goto out;
+
+ prev_bg->bg_next_group = bg->bg_next_group;
+ ocfs2_journal_dirty(handle, prev_bg_bh);
+
+ status = ocfs2_journal_access_gd(handle, INODE_CACHE(alloc_inode),
+ bg_bh, OCFS2_JOURNAL_ACCESS_WRITE);
+ if (status < 0)
+ goto out_rollback_prev_bg;
+
+ bg->bg_next_group = fe->id2.i_chain.cl_recs[chain].c_blkno;
+ ocfs2_journal_dirty(handle, bg_bh);
+
+ status = ocfs2_journal_access_di(handle, INODE_CACHE(alloc_inode),
+ fe_bh, OCFS2_JOURNAL_ACCESS_WRITE);
+ if (status < 0)
+ goto out_rollback_bg;
+
+ fe->id2.i_chain.cl_recs[chain].c_blkno = bg->bg_blkno;
+ ocfs2_journal_dirty(handle, fe_bh);
+
+out:
+ if (status < 0)
+ mlog_errno(status);
+ return status;
+
+out_rollback_bg:
+ bg->bg_next_group = cpu_to_le64(bg_ptr);
+out_rollback_prev_bg:
+ prev_bg->bg_next_group = cpu_to_le64(prev_bg_ptr);
+ goto out;
+}
+
+static inline int ocfs2_block_group_reasonably_empty(struct ocfs2_group_desc *bg,
+ u32 wanted)
+{
+ return le16_to_cpu(bg->bg_free_bits_count) > wanted;
+}
+
+/* return 0 on success, -ENOSPC to keep searching and any other < 0
+ * value on error. */
+static int ocfs2_cluster_group_search(struct inode *inode,
+ struct buffer_head *group_bh,
+ u32 bits_wanted, u32 min_bits,
+ u64 max_block,
+ struct ocfs2_suballoc_result *res)
+{
+ int search = -ENOSPC;
+ int ret;
+ u64 blkoff;
+ struct ocfs2_group_desc *gd = (struct ocfs2_group_desc *) group_bh->b_data;
+ struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+ unsigned int max_bits, gd_cluster_off;
+
+ BUG_ON(!ocfs2_is_cluster_bitmap(inode));
+
+ if (gd->bg_free_bits_count) {
+ max_bits = le16_to_cpu(gd->bg_bits);
+
+ /* Tail groups in cluster bitmaps which aren't cpg
+ * aligned are prone to partial extension by a failed
+ * fs resize. If the file system resize never got to
+ * update the dinode cluster count, then we don't want
+ * to trust any clusters past it, regardless of what
+ * the group descriptor says. */
+ gd_cluster_off = ocfs2_blocks_to_clusters(inode->i_sb,
+ le64_to_cpu(gd->bg_blkno));
+ if ((gd_cluster_off + max_bits) >
+ OCFS2_I(inode)->ip_clusters) {
+ max_bits = OCFS2_I(inode)->ip_clusters - gd_cluster_off;
+ trace_ocfs2_cluster_group_search_wrong_max_bits(
+ (unsigned long long)le64_to_cpu(gd->bg_blkno),
+ le16_to_cpu(gd->bg_bits),
+ OCFS2_I(inode)->ip_clusters, max_bits);
+ }
+
+ ret = ocfs2_block_group_find_clear_bits(osb,
+ group_bh, bits_wanted,
+ max_bits, res);
+ if (ret)
+ return ret;
+
+ if (max_block) {
+ blkoff = ocfs2_clusters_to_blocks(inode->i_sb,
+ gd_cluster_off +
+ res->sr_bit_offset +
+ res->sr_bits);
+ trace_ocfs2_cluster_group_search_max_block(
+ (unsigned long long)blkoff,
+ (unsigned long long)max_block);
+ if (blkoff > max_block)
+ return -ENOSPC;
+ }
+
+ /* ocfs2_block_group_find_clear_bits() might
+ * return success, but we still want to return
+ * -ENOSPC unless it found the minimum number
+ * of bits. */
+ if (min_bits <= res->sr_bits)
+ search = 0; /* success */
+ else if (res->sr_bits) {
+ /*
+ * Don't show bits which we'll be returning
+ * for allocation to the local alloc bitmap.
+ */
+ ocfs2_local_alloc_seen_free_bits(osb, res->sr_bits);
+ }
+ }
+
+ return search;
+}
+
+static int ocfs2_block_group_search(struct inode *inode,
+ struct buffer_head *group_bh,
+ u32 bits_wanted, u32 min_bits,
+ u64 max_block,
+ struct ocfs2_suballoc_result *res)
+{
+ int ret = -ENOSPC;
+ u64 blkoff;
+ struct ocfs2_group_desc *bg = (struct ocfs2_group_desc *) group_bh->b_data;
+
+ BUG_ON(min_bits != 1);
+ BUG_ON(ocfs2_is_cluster_bitmap(inode));
+
+ if (bg->bg_free_bits_count) {
+ ret = ocfs2_block_group_find_clear_bits(OCFS2_SB(inode->i_sb),
+ group_bh, bits_wanted,
+ le16_to_cpu(bg->bg_bits),
+ res);
+ if (!ret && max_block) {
+ blkoff = le64_to_cpu(bg->bg_blkno) +
+ res->sr_bit_offset + res->sr_bits;
+ trace_ocfs2_block_group_search_max_block(
+ (unsigned long long)blkoff,
+ (unsigned long long)max_block);
+ if (blkoff > max_block)
+ ret = -ENOSPC;
+ }
+ }
+
+ return ret;
+}
+
+int ocfs2_alloc_dinode_update_counts(struct inode *inode,
+ handle_t *handle,
+ struct buffer_head *di_bh,
+ u32 num_bits,
+ u16 chain)
+{
+ int ret;
+ u32 tmp_used;
+ struct ocfs2_dinode *di = (struct ocfs2_dinode *) di_bh->b_data;
+ struct ocfs2_chain_list *cl = (struct ocfs2_chain_list *) &di->id2.i_chain;
+
+ ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
+ OCFS2_JOURNAL_ACCESS_WRITE);
+ if (ret < 0) {
+ mlog_errno(ret);
+ goto out;
+ }
+
+ tmp_used = le32_to_cpu(di->id1.bitmap1.i_used);
+ di->id1.bitmap1.i_used = cpu_to_le32(num_bits + tmp_used);
+ le32_add_cpu(&cl->cl_recs[chain].c_free, -num_bits);
+ ocfs2_journal_dirty(handle, di_bh);
+
+out:
+ return ret;
+}
+
+void ocfs2_rollback_alloc_dinode_counts(struct inode *inode,
+ struct buffer_head *di_bh,
+ u32 num_bits,
+ u16 chain)
+{
+ u32 tmp_used;
+ struct ocfs2_dinode *di = (struct ocfs2_dinode *) di_bh->b_data;
+ struct ocfs2_chain_list *cl;
+
+ cl = (struct ocfs2_chain_list *)&di->id2.i_chain;
+ tmp_used = le32_to_cpu(di->id1.bitmap1.i_used);
+ di->id1.bitmap1.i_used = cpu_to_le32(tmp_used - num_bits);
+ le32_add_cpu(&cl->cl_recs[chain].c_free, num_bits);
+}
+
+static int ocfs2_bg_discontig_fix_by_rec(struct ocfs2_suballoc_result *res,
+ struct ocfs2_extent_rec *rec,
+ struct ocfs2_chain_list *cl)
+{
+ unsigned int bpc = le16_to_cpu(cl->cl_bpc);
+ unsigned int bitoff = le32_to_cpu(rec->e_cpos) * bpc;
+ unsigned int bitcount = le16_to_cpu(rec->e_leaf_clusters) * bpc;
+
+ if (res->sr_bit_offset < bitoff)
+ return 0;
+ if (res->sr_bit_offset >= (bitoff + bitcount))
+ return 0;
+ res->sr_blkno = le64_to_cpu(rec->e_blkno) +
+ (res->sr_bit_offset - bitoff);
+ if ((res->sr_bit_offset + res->sr_bits) > (bitoff + bitcount))
+ res->sr_bits = (bitoff + bitcount) - res->sr_bit_offset;
+ return 1;
+}
+
+static void ocfs2_bg_discontig_fix_result(struct ocfs2_alloc_context *ac,
+ struct ocfs2_group_desc *bg,
+ struct ocfs2_suballoc_result *res)
+{
+ int i;
+ u64 bg_blkno = res->sr_bg_blkno; /* Save off */
+ struct ocfs2_extent_rec *rec;
+ struct ocfs2_dinode *di = (struct ocfs2_dinode *)ac->ac_bh->b_data;
+ struct ocfs2_chain_list *cl = &di->id2.i_chain;
+
+ if (ocfs2_is_cluster_bitmap(ac->ac_inode)) {
+ res->sr_blkno = 0;
+ return;
+ }
+
+ res->sr_blkno = res->sr_bg_blkno + res->sr_bit_offset;
+ res->sr_bg_blkno = 0; /* Clear it for contig block groups */
+ if (!ocfs2_supports_discontig_bg(OCFS2_SB(ac->ac_inode->i_sb)) ||
+ !bg->bg_list.l_next_free_rec)
+ return;
+
+ for (i = 0; i < le16_to_cpu(bg->bg_list.l_next_free_rec); i++) {
+ rec = &bg->bg_list.l_recs[i];
+ if (ocfs2_bg_discontig_fix_by_rec(res, rec, cl)) {
+ res->sr_bg_blkno = bg_blkno; /* Restore */
+ break;
+ }
+ }
+}
+
+static int ocfs2_search_one_group(struct ocfs2_alloc_context *ac,
+ handle_t *handle,
+ u32 bits_wanted,
+ u32 min_bits,
+ struct ocfs2_suballoc_result *res,
+ u16 *bits_left)
+{
+ int ret;
+ struct buffer_head *group_bh = NULL;
+ struct ocfs2_group_desc *gd;
+ struct ocfs2_dinode *di = (struct ocfs2_dinode *)ac->ac_bh->b_data;
+ struct inode *alloc_inode = ac->ac_inode;
+
+ ret = ocfs2_read_group_descriptor(alloc_inode, di,
+ res->sr_bg_blkno, &group_bh);
+ if (ret < 0) {
+ mlog_errno(ret);
+ return ret;
+ }
+
+ gd = (struct ocfs2_group_desc *) group_bh->b_data;
+ ret = ac->ac_group_search(alloc_inode, group_bh, bits_wanted, min_bits,
+ ac->ac_max_block, res);
+ if (ret < 0) {
+ if (ret != -ENOSPC)
+ mlog_errno(ret);
+ goto out;
+ }
+
+ if (!ret)
+ ocfs2_bg_discontig_fix_result(ac, gd, res);
+
+ /*
+ * sr_bg_blkno might have been changed by
+ * ocfs2_bg_discontig_fix_result
+ */
+ res->sr_bg_stable_blkno = group_bh->b_blocknr;
+
+ if (ac->ac_find_loc_only)
+ goto out_loc_only;
+
+ ret = ocfs2_alloc_dinode_update_counts(alloc_inode, handle, ac->ac_bh,
+ res->sr_bits,
+ le16_to_cpu(gd->bg_chain));
+ if (ret < 0) {
+ mlog_errno(ret);
+ goto out;
+ }
+
+ ret = ocfs2_block_group_set_bits(handle, alloc_inode, gd, group_bh,
+ res->sr_bit_offset, res->sr_bits);
+ if (ret < 0) {
+ ocfs2_rollback_alloc_dinode_counts(alloc_inode, ac->ac_bh,
+ res->sr_bits,
+ le16_to_cpu(gd->bg_chain));
+ mlog_errno(ret);
+ }
+
+out_loc_only:
+ *bits_left = le16_to_cpu(gd->bg_free_bits_count);
+
+out:
+ brelse(group_bh);
+
+ return ret;
+}
+
+static int ocfs2_search_chain(struct ocfs2_alloc_context *ac,
+ handle_t *handle,
+ u32 bits_wanted,
+ u32 min_bits,
+ struct ocfs2_suballoc_result *res,
+ u16 *bits_left)
+{
+ int status;
+ u16 chain;
+ u64 next_group;
+ struct inode *alloc_inode = ac->ac_inode;
+ struct buffer_head *group_bh = NULL;
+ struct buffer_head *prev_group_bh = NULL;
+ struct ocfs2_dinode *fe = (struct ocfs2_dinode *) ac->ac_bh->b_data;
+ struct ocfs2_chain_list *cl = (struct ocfs2_chain_list *) &fe->id2.i_chain;
+ struct ocfs2_group_desc *bg;
+
+ chain = ac->ac_chain;
+ trace_ocfs2_search_chain_begin(
+ (unsigned long long)OCFS2_I(alloc_inode)->ip_blkno,
+ bits_wanted, chain);
+
+ status = ocfs2_read_group_descriptor(alloc_inode, fe,
+ le64_to_cpu(cl->cl_recs[chain].c_blkno),
+ &group_bh);
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail;
+ }
+ bg = (struct ocfs2_group_desc *) group_bh->b_data;
+
+ status = -ENOSPC;
+ /* for now, the chain search is a bit simplistic. We just use
+ * the 1st group with any empty bits. */
+ while ((status = ac->ac_group_search(alloc_inode, group_bh,
+ bits_wanted, min_bits,
+ ac->ac_max_block,
+ res)) == -ENOSPC) {
+ if (!bg->bg_next_group)
+ break;
+
+ brelse(prev_group_bh);
+ prev_group_bh = NULL;
+
+ next_group = le64_to_cpu(bg->bg_next_group);
+ prev_group_bh = group_bh;
+ group_bh = NULL;
+ status = ocfs2_read_group_descriptor(alloc_inode, fe,
+ next_group, &group_bh);
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail;
+ }
+ bg = (struct ocfs2_group_desc *) group_bh->b_data;
+ }
+ if (status < 0) {
+ if (status != -ENOSPC)
+ mlog_errno(status);
+ goto bail;
+ }
+
+ trace_ocfs2_search_chain_succ(
+ (unsigned long long)le64_to_cpu(bg->bg_blkno), res->sr_bits);
+
+ res->sr_bg_blkno = le64_to_cpu(bg->bg_blkno);
+
+ BUG_ON(res->sr_bits == 0);
+ if (!status)
+ ocfs2_bg_discontig_fix_result(ac, bg, res);
+
+ /*
+ * sr_bg_blkno might have been changed by
+ * ocfs2_bg_discontig_fix_result
+ */
+ res->sr_bg_stable_blkno = group_bh->b_blocknr;
+
+ /*
+ * Keep track of previous block descriptor read. When
+ * we find a target, if we have read more than X
+ * number of descriptors, and the target is reasonably
+ * empty, relink him to top of his chain.
+ *
+ * We've read 0 extra blocks and only send one more to
+ * the transaction, yet the next guy to search has a
+ * much easier time.
+ *
+ * Do this *after* figuring out how many bits we're taking out
+ * of our target group.
+ */
+ if (!ac->ac_disable_chain_relink &&
+ (prev_group_bh) &&
+ (ocfs2_block_group_reasonably_empty(bg, res->sr_bits))) {
+ status = ocfs2_relink_block_group(handle, alloc_inode,
+ ac->ac_bh, group_bh,
+ prev_group_bh, chain);
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail;
+ }
+ }
+
+ if (ac->ac_find_loc_only)
+ goto out_loc_only;
+
+ status = ocfs2_alloc_dinode_update_counts(alloc_inode, handle,
+ ac->ac_bh, res->sr_bits,
+ chain);
+ if (status) {
+ mlog_errno(status);
+ goto bail;
+ }
+
+ status = ocfs2_block_group_set_bits(handle,
+ alloc_inode,
+ bg,
+ group_bh,
+ res->sr_bit_offset,
+ res->sr_bits);
+ if (status < 0) {
+ ocfs2_rollback_alloc_dinode_counts(alloc_inode,
+ ac->ac_bh, res->sr_bits, chain);
+ mlog_errno(status);
+ goto bail;
+ }
+
+ trace_ocfs2_search_chain_end(
+ (unsigned long long)le64_to_cpu(fe->i_blkno),
+ res->sr_bits);
+
+out_loc_only:
+ *bits_left = le16_to_cpu(bg->bg_free_bits_count);
+bail:
+ brelse(group_bh);
+ brelse(prev_group_bh);
+
+ if (status)
+ mlog_errno(status);
+ return status;
+}
+
+/* will give out up to bits_wanted contiguous bits. */
+static int ocfs2_claim_suballoc_bits(struct ocfs2_alloc_context *ac,
+ handle_t *handle,
+ u32 bits_wanted,
+ u32 min_bits,
+ struct ocfs2_suballoc_result *res)
+{
+ int status;
+ u16 victim, i;
+ u16 bits_left = 0;
+ u64 hint = ac->ac_last_group;
+ struct ocfs2_chain_list *cl;
+ struct ocfs2_dinode *fe;
+
+ BUG_ON(ac->ac_bits_given >= ac->ac_bits_wanted);
+ BUG_ON(bits_wanted > (ac->ac_bits_wanted - ac->ac_bits_given));
+ BUG_ON(!ac->ac_bh);
+
+ fe = (struct ocfs2_dinode *) ac->ac_bh->b_data;
+
+ /* The bh was validated by the inode read during
+ * ocfs2_reserve_suballoc_bits(). Any corruption is a code bug. */
+ BUG_ON(!OCFS2_IS_VALID_DINODE(fe));
+
+ if (le32_to_cpu(fe->id1.bitmap1.i_used) >=
+ le32_to_cpu(fe->id1.bitmap1.i_total)) {
+ status = ocfs2_error(ac->ac_inode->i_sb,
+ "Chain allocator dinode %llu has %u used bits but only %u total\n",
+ (unsigned long long)le64_to_cpu(fe->i_blkno),
+ le32_to_cpu(fe->id1.bitmap1.i_used),
+ le32_to_cpu(fe->id1.bitmap1.i_total));
+ goto bail;
+ }
+
+ res->sr_bg_blkno = hint;
+ if (res->sr_bg_blkno) {
+ /* Attempt to short-circuit the usual search mechanism
+ * by jumping straight to the most recently used
+ * allocation group. This helps us maintain some
+ * contiguousness across allocations. */
+ status = ocfs2_search_one_group(ac, handle, bits_wanted,
+ min_bits, res, &bits_left);
+ if (!status)
+ goto set_hint;
+ if (status < 0 && status != -ENOSPC) {
+ mlog_errno(status);
+ goto bail;
+ }
+ }
+
+ cl = (struct ocfs2_chain_list *) &fe->id2.i_chain;
+
+ victim = ocfs2_find_victim_chain(cl);
+ ac->ac_chain = victim;
+
+ status = ocfs2_search_chain(ac, handle, bits_wanted, min_bits,
+ res, &bits_left);
+ if (!status) {
+ if (ocfs2_is_cluster_bitmap(ac->ac_inode))
+ hint = res->sr_bg_blkno;
+ else
+ hint = ocfs2_group_from_res(res);
+ goto set_hint;
+ }
+ if (status < 0 && status != -ENOSPC) {
+ mlog_errno(status);
+ goto bail;
+ }
+
+ trace_ocfs2_claim_suballoc_bits(victim);
+
+ /* If we didn't pick a good victim, then just default to
+ * searching each chain in order. Don't allow chain relinking
+ * because we only calculate enough journal credits for one
+ * relink per alloc. */
+ ac->ac_disable_chain_relink = 1;
+ for (i = 0; i < le16_to_cpu(cl->cl_next_free_rec); i ++) {
+ if (i == victim)
+ continue;
+ if (!cl->cl_recs[i].c_free)
+ continue;
+
+ ac->ac_chain = i;
+ status = ocfs2_search_chain(ac, handle, bits_wanted, min_bits,
+ res, &bits_left);
+ if (!status) {
+ hint = ocfs2_group_from_res(res);
+ break;
+ }
+ if (status < 0 && status != -ENOSPC) {
+ mlog_errno(status);
+ goto bail;
+ }
+ }
+
+set_hint:
+ if (status != -ENOSPC) {
+ /* If the next search of this group is not likely to
+ * yield a suitable extent, then we reset the last
+ * group hint so as to not waste a disk read */
+ if (bits_left < min_bits)
+ ac->ac_last_group = 0;
+ else
+ ac->ac_last_group = hint;
+ }
+
+bail:
+ if (status)
+ mlog_errno(status);
+ return status;
+}
+
+int ocfs2_claim_metadata(handle_t *handle,
+ struct ocfs2_alloc_context *ac,
+ u32 bits_wanted,
+ u64 *suballoc_loc,
+ u16 *suballoc_bit_start,
+ unsigned int *num_bits,
+ u64 *blkno_start)
+{
+ int status;
+ struct ocfs2_suballoc_result res = { .sr_blkno = 0, };
+
+ BUG_ON(!ac);
+ BUG_ON(ac->ac_bits_wanted < (ac->ac_bits_given + bits_wanted));
+ BUG_ON(ac->ac_which != OCFS2_AC_USE_META);
+
+ status = ocfs2_claim_suballoc_bits(ac,
+ handle,
+ bits_wanted,
+ 1,
+ &res);
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail;
+ }
+ atomic_inc(&OCFS2_SB(ac->ac_inode->i_sb)->alloc_stats.bg_allocs);
+
+ *suballoc_loc = res.sr_bg_blkno;
+ *suballoc_bit_start = res.sr_bit_offset;
+ *blkno_start = res.sr_blkno;
+ ac->ac_bits_given += res.sr_bits;
+ *num_bits = res.sr_bits;
+ status = 0;
+bail:
+ if (status)
+ mlog_errno(status);
+ return status;
+}
+
+static void ocfs2_init_inode_ac_group(struct inode *dir,
+ struct buffer_head *parent_di_bh,
+ struct ocfs2_alloc_context *ac)
+{
+ struct ocfs2_dinode *di = (struct ocfs2_dinode *)parent_di_bh->b_data;
+ /*
+ * Try to allocate inodes from some specific group.
+ *
+ * If the parent dir has recorded the last group used in allocation,
+ * cool, use it. Otherwise if we try to allocate new inode from the
+ * same slot the parent dir belongs to, use the same chunk.
+ *
+ * We are very careful here to avoid the mistake of setting
+ * ac_last_group to a group descriptor from a different (unlocked) slot.
+ */
+ if (OCFS2_I(dir)->ip_last_used_group &&
+ OCFS2_I(dir)->ip_last_used_slot == ac->ac_alloc_slot)
+ ac->ac_last_group = OCFS2_I(dir)->ip_last_used_group;
+ else if (le16_to_cpu(di->i_suballoc_slot) == ac->ac_alloc_slot) {
+ if (di->i_suballoc_loc)
+ ac->ac_last_group = le64_to_cpu(di->i_suballoc_loc);
+ else
+ ac->ac_last_group = ocfs2_which_suballoc_group(
+ le64_to_cpu(di->i_blkno),
+ le16_to_cpu(di->i_suballoc_bit));
+ }
+}
+
+static inline void ocfs2_save_inode_ac_group(struct inode *dir,
+ struct ocfs2_alloc_context *ac)
+{
+ OCFS2_I(dir)->ip_last_used_group = ac->ac_last_group;
+ OCFS2_I(dir)->ip_last_used_slot = ac->ac_alloc_slot;
+}
+
+int ocfs2_find_new_inode_loc(struct inode *dir,
+ struct buffer_head *parent_fe_bh,
+ struct ocfs2_alloc_context *ac,
+ u64 *fe_blkno)
+{
+ int ret;
+ handle_t *handle = NULL;
+ struct ocfs2_suballoc_result *res;
+
+ BUG_ON(!ac);
+ BUG_ON(ac->ac_bits_given != 0);
+ BUG_ON(ac->ac_bits_wanted != 1);
+ BUG_ON(ac->ac_which != OCFS2_AC_USE_INODE);
+
+ res = kzalloc(sizeof(*res), GFP_NOFS);
+ if (res == NULL) {
+ ret = -ENOMEM;
+ mlog_errno(ret);
+ goto out;
+ }
+
+ ocfs2_init_inode_ac_group(dir, parent_fe_bh, ac);
+
+ /*
+ * The handle started here is for chain relink. Alternatively,
+ * we could just disable relink for these calls.
+ */
+ handle = ocfs2_start_trans(OCFS2_SB(dir->i_sb), OCFS2_SUBALLOC_ALLOC);
+ if (IS_ERR(handle)) {
+ ret = PTR_ERR(handle);
+ handle = NULL;
+ mlog_errno(ret);
+ goto out;
+ }
+
+ /*
+ * This will instruct ocfs2_claim_suballoc_bits and
+ * ocfs2_search_one_group to search but save actual allocation
+ * for later.
+ */
+ ac->ac_find_loc_only = 1;
+
+ ret = ocfs2_claim_suballoc_bits(ac, handle, 1, 1, res);
+ if (ret < 0) {
+ mlog_errno(ret);
+ goto out;
+ }
+
+ ac->ac_find_loc_priv = res;
+ *fe_blkno = res->sr_blkno;
+ ocfs2_update_inode_fsync_trans(handle, dir, 0);
+out:
+ if (handle)
+ ocfs2_commit_trans(OCFS2_SB(dir->i_sb), handle);
+
+ if (ret)
+ kfree(res);
+
+ return ret;
+}
+
+int ocfs2_claim_new_inode_at_loc(handle_t *handle,
+ struct inode *dir,
+ struct ocfs2_alloc_context *ac,
+ u64 *suballoc_loc,
+ u16 *suballoc_bit,
+ u64 di_blkno)
+{
+ int ret;
+ u16 chain;
+ struct ocfs2_suballoc_result *res = ac->ac_find_loc_priv;
+ struct buffer_head *bg_bh = NULL;
+ struct ocfs2_group_desc *bg;
+ struct ocfs2_dinode *di = (struct ocfs2_dinode *) ac->ac_bh->b_data;
+
+ /*
+ * Since di_blkno is being passed back in, we check for any
+ * inconsistencies which may have happened between
+ * calls. These are code bugs as di_blkno is not expected to
+ * change once returned from ocfs2_find_new_inode_loc()
+ */
+ BUG_ON(res->sr_blkno != di_blkno);
+
+ ret = ocfs2_read_group_descriptor(ac->ac_inode, di,
+ res->sr_bg_stable_blkno, &bg_bh);
+ if (ret) {
+ mlog_errno(ret);
+ goto out;
+ }
+
+ bg = (struct ocfs2_group_desc *) bg_bh->b_data;
+ chain = le16_to_cpu(bg->bg_chain);
+
+ ret = ocfs2_alloc_dinode_update_counts(ac->ac_inode, handle,
+ ac->ac_bh, res->sr_bits,
+ chain);
+ if (ret) {
+ mlog_errno(ret);
+ goto out;
+ }
+
+ ret = ocfs2_block_group_set_bits(handle,
+ ac->ac_inode,
+ bg,
+ bg_bh,
+ res->sr_bit_offset,
+ res->sr_bits);
+ if (ret < 0) {
+ ocfs2_rollback_alloc_dinode_counts(ac->ac_inode,
+ ac->ac_bh, res->sr_bits, chain);
+ mlog_errno(ret);
+ goto out;
+ }
+
+ trace_ocfs2_claim_new_inode_at_loc((unsigned long long)di_blkno,
+ res->sr_bits);
+
+ atomic_inc(&OCFS2_SB(ac->ac_inode->i_sb)->alloc_stats.bg_allocs);
+
+ BUG_ON(res->sr_bits != 1);
+
+ *suballoc_loc = res->sr_bg_blkno;
+ *suballoc_bit = res->sr_bit_offset;
+ ac->ac_bits_given++;
+ ocfs2_save_inode_ac_group(dir, ac);
+
+out:
+ brelse(bg_bh);
+
+ return ret;
+}
+
+int ocfs2_claim_new_inode(handle_t *handle,
+ struct inode *dir,
+ struct buffer_head *parent_fe_bh,
+ struct ocfs2_alloc_context *ac,
+ u64 *suballoc_loc,
+ u16 *suballoc_bit,
+ u64 *fe_blkno)
+{
+ int status;
+ struct ocfs2_suballoc_result res;
+
+ BUG_ON(!ac);
+ BUG_ON(ac->ac_bits_given != 0);
+ BUG_ON(ac->ac_bits_wanted != 1);
+ BUG_ON(ac->ac_which != OCFS2_AC_USE_INODE);
+
+ ocfs2_init_inode_ac_group(dir, parent_fe_bh, ac);
+
+ status = ocfs2_claim_suballoc_bits(ac,
+ handle,
+ 1,
+ 1,
+ &res);
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail;
+ }
+ atomic_inc(&OCFS2_SB(ac->ac_inode->i_sb)->alloc_stats.bg_allocs);
+
+ BUG_ON(res.sr_bits != 1);
+
+ *suballoc_loc = res.sr_bg_blkno;
+ *suballoc_bit = res.sr_bit_offset;
+ *fe_blkno = res.sr_blkno;
+ ac->ac_bits_given++;
+ ocfs2_save_inode_ac_group(dir, ac);
+ status = 0;
+bail:
+ if (status)
+ mlog_errno(status);
+ return status;
+}
+
+/* translate a group desc. blkno and it's bitmap offset into
+ * disk cluster offset. */
+static inline u32 ocfs2_desc_bitmap_to_cluster_off(struct inode *inode,
+ u64 bg_blkno,
+ u16 bg_bit_off)
+{
+ struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+ u32 cluster = 0;
+
+ BUG_ON(!ocfs2_is_cluster_bitmap(inode));
+
+ if (bg_blkno != osb->first_cluster_group_blkno)
+ cluster = ocfs2_blocks_to_clusters(inode->i_sb, bg_blkno);
+ cluster += (u32) bg_bit_off;
+ return cluster;
+}
+
+/* given a cluster offset, calculate which block group it belongs to
+ * and return that block offset. */
+u64 ocfs2_which_cluster_group(struct inode *inode, u32 cluster)
+{
+ struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+ u32 group_no;
+
+ BUG_ON(!ocfs2_is_cluster_bitmap(inode));
+
+ group_no = cluster / osb->bitmap_cpg;
+ if (!group_no)
+ return osb->first_cluster_group_blkno;
+ return ocfs2_clusters_to_blocks(inode->i_sb,
+ group_no * osb->bitmap_cpg);
+}
+
+/* given the block number of a cluster start, calculate which cluster
+ * group and descriptor bitmap offset that corresponds to. */
+static inline void ocfs2_block_to_cluster_group(struct inode *inode,
+ u64 data_blkno,
+ u64 *bg_blkno,
+ u16 *bg_bit_off)
+{
+ struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+ u32 data_cluster = ocfs2_blocks_to_clusters(osb->sb, data_blkno);
+
+ BUG_ON(!ocfs2_is_cluster_bitmap(inode));
+
+ *bg_blkno = ocfs2_which_cluster_group(inode,
+ data_cluster);
+
+ if (*bg_blkno == osb->first_cluster_group_blkno)
+ *bg_bit_off = (u16) data_cluster;
+ else
+ *bg_bit_off = (u16) ocfs2_blocks_to_clusters(osb->sb,
+ data_blkno - *bg_blkno);
+}
+
+/*
+ * min_bits - minimum contiguous chunk from this total allocation we
+ * can handle. set to what we asked for originally for a full
+ * contig. allocation, set to '1' to indicate we can deal with extents
+ * of any size.
+ */
+int __ocfs2_claim_clusters(handle_t *handle,
+ struct ocfs2_alloc_context *ac,
+ u32 min_clusters,
+ u32 max_clusters,
+ u32 *cluster_start,
+ u32 *num_clusters)
+{
+ int status;
+ unsigned int bits_wanted = max_clusters;
+ struct ocfs2_suballoc_result res = { .sr_blkno = 0, };
+ struct ocfs2_super *osb = OCFS2_SB(ac->ac_inode->i_sb);
+
+ BUG_ON(ac->ac_bits_given >= ac->ac_bits_wanted);
+
+ BUG_ON(ac->ac_which != OCFS2_AC_USE_LOCAL
+ && ac->ac_which != OCFS2_AC_USE_MAIN);
+
+ if (ac->ac_which == OCFS2_AC_USE_LOCAL) {
+ WARN_ON(min_clusters > 1);
+
+ status = ocfs2_claim_local_alloc_bits(osb,
+ handle,
+ ac,
+ bits_wanted,
+ cluster_start,
+ num_clusters);
+ if (!status)
+ atomic_inc(&osb->alloc_stats.local_data);
+ } else {
+ if (min_clusters > (osb->bitmap_cpg - 1)) {
+ /* The only paths asking for contiguousness
+ * should know about this already. */
+ mlog(ML_ERROR, "minimum allocation requested %u exceeds "
+ "group bitmap size %u!\n", min_clusters,
+ osb->bitmap_cpg);
+ status = -ENOSPC;
+ goto bail;
+ }
+ /* clamp the current request down to a realistic size. */
+ if (bits_wanted > (osb->bitmap_cpg - 1))
+ bits_wanted = osb->bitmap_cpg - 1;
+
+ status = ocfs2_claim_suballoc_bits(ac,
+ handle,
+ bits_wanted,
+ min_clusters,
+ &res);
+ if (!status) {
+ BUG_ON(res.sr_blkno); /* cluster alloc can't set */
+ *cluster_start =
+ ocfs2_desc_bitmap_to_cluster_off(ac->ac_inode,
+ res.sr_bg_blkno,
+ res.sr_bit_offset);
+ atomic_inc(&osb->alloc_stats.bitmap_data);
+ *num_clusters = res.sr_bits;
+ }
+ }
+ if (status < 0) {
+ if (status != -ENOSPC)
+ mlog_errno(status);
+ goto bail;
+ }
+
+ ac->ac_bits_given += *num_clusters;
+
+bail:
+ if (status)
+ mlog_errno(status);
+ return status;
+}
+
+int ocfs2_claim_clusters(handle_t *handle,
+ struct ocfs2_alloc_context *ac,
+ u32 min_clusters,
+ u32 *cluster_start,
+ u32 *num_clusters)
+{
+ unsigned int bits_wanted = ac->ac_bits_wanted - ac->ac_bits_given;
+
+ return __ocfs2_claim_clusters(handle, ac, min_clusters,
+ bits_wanted, cluster_start, num_clusters);
+}
+
+static int ocfs2_block_group_clear_bits(handle_t *handle,
+ struct inode *alloc_inode,
+ struct ocfs2_group_desc *bg,
+ struct buffer_head *group_bh,
+ unsigned int bit_off,
+ unsigned int num_bits,
+ void (*undo_fn)(unsigned int bit,
+ unsigned long *bmap))
+{
+ int status;
+ unsigned int tmp;
+ struct ocfs2_group_desc *undo_bg = NULL;
+
+ /* The caller got this descriptor from
+ * ocfs2_read_group_descriptor(). Any corruption is a code bug. */
+ BUG_ON(!OCFS2_IS_VALID_GROUP_DESC(bg));
+
+ trace_ocfs2_block_group_clear_bits(bit_off, num_bits);
+
+ BUG_ON(undo_fn && !ocfs2_is_cluster_bitmap(alloc_inode));
+ status = ocfs2_journal_access_gd(handle, INODE_CACHE(alloc_inode),
+ group_bh,
+ undo_fn ?
+ OCFS2_JOURNAL_ACCESS_UNDO :
+ OCFS2_JOURNAL_ACCESS_WRITE);
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail;
+ }
+
+ if (undo_fn) {
+ jbd_lock_bh_state(group_bh);
+ undo_bg = (struct ocfs2_group_desc *)
+ bh2jh(group_bh)->b_committed_data;
+ BUG_ON(!undo_bg);
+ }
+
+ tmp = num_bits;
+ while(tmp--) {
+ ocfs2_clear_bit((bit_off + tmp),
+ (unsigned long *) bg->bg_bitmap);
+ if (undo_fn)
+ undo_fn(bit_off + tmp,
+ (unsigned long *) undo_bg->bg_bitmap);
+ }
+ le16_add_cpu(&bg->bg_free_bits_count, num_bits);
+ if (le16_to_cpu(bg->bg_free_bits_count) > le16_to_cpu(bg->bg_bits)) {
+ if (undo_fn)
+ jbd_unlock_bh_state(group_bh);
+ return ocfs2_error(alloc_inode->i_sb, "Group descriptor # %llu has bit count %u but claims %u are freed. num_bits %d\n",
+ (unsigned long long)le64_to_cpu(bg->bg_blkno),
+ le16_to_cpu(bg->bg_bits),
+ le16_to_cpu(bg->bg_free_bits_count),
+ num_bits);
+ }
+
+ if (undo_fn)
+ jbd_unlock_bh_state(group_bh);
+
+ ocfs2_journal_dirty(handle, group_bh);
+bail:
+ return status;
+}
+
+/*
+ * expects the suballoc inode to already be locked.
+ */
+static int _ocfs2_free_suballoc_bits(handle_t *handle,
+ struct inode *alloc_inode,
+ struct buffer_head *alloc_bh,
+ unsigned int start_bit,
+ u64 bg_blkno,
+ unsigned int count,
+ void (*undo_fn)(unsigned int bit,
+ unsigned long *bitmap))
+{
+ int status = 0;
+ u32 tmp_used;
+ struct ocfs2_dinode *fe = (struct ocfs2_dinode *) alloc_bh->b_data;
+ struct ocfs2_chain_list *cl = &fe->id2.i_chain;
+ struct buffer_head *group_bh = NULL;
+ struct ocfs2_group_desc *group;
+
+ /* The alloc_bh comes from ocfs2_free_dinode() or
+ * ocfs2_free_clusters(). The callers have all locked the
+ * allocator and gotten alloc_bh from the lock call. This
+ * validates the dinode buffer. Any corruption that has happened
+ * is a code bug. */
+ BUG_ON(!OCFS2_IS_VALID_DINODE(fe));
+ BUG_ON((count + start_bit) > ocfs2_bits_per_group(cl));
+
+ trace_ocfs2_free_suballoc_bits(
+ (unsigned long long)OCFS2_I(alloc_inode)->ip_blkno,
+ (unsigned long long)bg_blkno,
+ start_bit, count);
+
+ status = ocfs2_read_group_descriptor(alloc_inode, fe, bg_blkno,
+ &group_bh);
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail;
+ }
+ group = (struct ocfs2_group_desc *) group_bh->b_data;
+
+ BUG_ON((count + start_bit) > le16_to_cpu(group->bg_bits));
+
+ status = ocfs2_block_group_clear_bits(handle, alloc_inode,
+ group, group_bh,
+ start_bit, count, undo_fn);
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail;
+ }
+
+ status = ocfs2_journal_access_di(handle, INODE_CACHE(alloc_inode),
+ alloc_bh, OCFS2_JOURNAL_ACCESS_WRITE);
+ if (status < 0) {
+ mlog_errno(status);
+ ocfs2_block_group_set_bits(handle, alloc_inode, group, group_bh,
+ start_bit, count);
+ goto bail;
+ }
+
+ le32_add_cpu(&cl->cl_recs[le16_to_cpu(group->bg_chain)].c_free,
+ count);
+ tmp_used = le32_to_cpu(fe->id1.bitmap1.i_used);
+ fe->id1.bitmap1.i_used = cpu_to_le32(tmp_used - count);
+ ocfs2_journal_dirty(handle, alloc_bh);
+
+bail:
+ brelse(group_bh);
+
+ if (status)
+ mlog_errno(status);
+ return status;
+}
+
+int ocfs2_free_suballoc_bits(handle_t *handle,
+ struct inode *alloc_inode,
+ struct buffer_head *alloc_bh,
+ unsigned int start_bit,
+ u64 bg_blkno,
+ unsigned int count)
+{
+ return _ocfs2_free_suballoc_bits(handle, alloc_inode, alloc_bh,
+ start_bit, bg_blkno, count, NULL);
+}
+
+int ocfs2_free_dinode(handle_t *handle,
+ struct inode *inode_alloc_inode,
+ struct buffer_head *inode_alloc_bh,
+ struct ocfs2_dinode *di)
+{
+ u64 blk = le64_to_cpu(di->i_blkno);
+ u16 bit = le16_to_cpu(di->i_suballoc_bit);
+ u64 bg_blkno = ocfs2_which_suballoc_group(blk, bit);
+
+ if (di->i_suballoc_loc)
+ bg_blkno = le64_to_cpu(di->i_suballoc_loc);
+ return ocfs2_free_suballoc_bits(handle, inode_alloc_inode,
+ inode_alloc_bh, bit, bg_blkno, 1);
+}
+
+static int _ocfs2_free_clusters(handle_t *handle,
+ struct inode *bitmap_inode,
+ struct buffer_head *bitmap_bh,
+ u64 start_blk,
+ unsigned int num_clusters,
+ void (*undo_fn)(unsigned int bit,
+ unsigned long *bitmap))
+{
+ int status;
+ u16 bg_start_bit;
+ u64 bg_blkno;
+
+ /* You can't ever have a contiguous set of clusters
+ * bigger than a block group bitmap so we never have to worry
+ * about looping on them.
+ * This is expensive. We can safely remove once this stuff has
+ * gotten tested really well. */
+ BUG_ON(start_blk != ocfs2_clusters_to_blocks(bitmap_inode->i_sb,
+ ocfs2_blocks_to_clusters(bitmap_inode->i_sb,
+ start_blk)));
+
+
+ ocfs2_block_to_cluster_group(bitmap_inode, start_blk, &bg_blkno,
+ &bg_start_bit);
+
+ trace_ocfs2_free_clusters((unsigned long long)bg_blkno,
+ (unsigned long long)start_blk,
+ bg_start_bit, num_clusters);
+
+ status = _ocfs2_free_suballoc_bits(handle, bitmap_inode, bitmap_bh,
+ bg_start_bit, bg_blkno,
+ num_clusters, undo_fn);
+ if (status < 0) {
+ mlog_errno(status);
+ goto out;
+ }
+
+ ocfs2_local_alloc_seen_free_bits(OCFS2_SB(bitmap_inode->i_sb),
+ num_clusters);
+
+out:
+ if (status)
+ mlog_errno(status);
+ return status;
+}
+
+int ocfs2_free_clusters(handle_t *handle,
+ struct inode *bitmap_inode,
+ struct buffer_head *bitmap_bh,
+ u64 start_blk,
+ unsigned int num_clusters)
+{
+ return _ocfs2_free_clusters(handle, bitmap_inode, bitmap_bh,
+ start_blk, num_clusters,
+ _ocfs2_set_bit);
+}
+
+/*
+ * Give never-used clusters back to the global bitmap. We don't need
+ * to protect these bits in the undo buffer.
+ */
+int ocfs2_release_clusters(handle_t *handle,
+ struct inode *bitmap_inode,
+ struct buffer_head *bitmap_bh,
+ u64 start_blk,
+ unsigned int num_clusters)
+{
+ return _ocfs2_free_clusters(handle, bitmap_inode, bitmap_bh,
+ start_blk, num_clusters,
+ _ocfs2_clear_bit);
+}
+
+/*
+ * For a given allocation, determine which allocators will need to be
+ * accessed, and lock them, reserving the appropriate number of bits.
+ *
+ * Sparse file systems call this from ocfs2_write_begin_nolock()
+ * and ocfs2_allocate_unwritten_extents().
+ *
+ * File systems which don't support holes call this from
+ * ocfs2_extend_allocation().
+ */
+int ocfs2_lock_allocators(struct inode *inode,
+ struct ocfs2_extent_tree *et,
+ u32 clusters_to_add, u32 extents_to_split,
+ struct ocfs2_alloc_context **data_ac,
+ struct ocfs2_alloc_context **meta_ac)
+{
+ int ret = 0, num_free_extents;
+ unsigned int max_recs_needed = clusters_to_add + 2 * extents_to_split;
+ struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+
+ *meta_ac = NULL;
+ if (data_ac)
+ *data_ac = NULL;
+
+ BUG_ON(clusters_to_add != 0 && data_ac == NULL);
+
+ num_free_extents = ocfs2_num_free_extents(et);
+ if (num_free_extents < 0) {
+ ret = num_free_extents;
+ mlog_errno(ret);
+ goto out;
+ }
+
+ /*
+ * Sparse allocation file systems need to be more conservative
+ * with reserving room for expansion - the actual allocation
+ * happens while we've got a journal handle open so re-taking
+ * a cluster lock (because we ran out of room for another
+ * extent) will violate ordering rules.
+ *
+ * Most of the time we'll only be seeing this 1 cluster at a time
+ * anyway.
+ *
+ * Always lock for any unwritten extents - we might want to
+ * add blocks during a split.
+ */
+ if (!num_free_extents ||
+ (ocfs2_sparse_alloc(osb) && num_free_extents < max_recs_needed)) {
+ ret = ocfs2_reserve_new_metadata(osb, et->et_root_el, meta_ac);
+ if (ret < 0) {
+ if (ret != -ENOSPC)
+ mlog_errno(ret);
+ goto out;
+ }
+ }
+
+ if (clusters_to_add == 0)
+ goto out;
+
+ ret = ocfs2_reserve_clusters(osb, clusters_to_add, data_ac);
+ if (ret < 0) {
+ if (ret != -ENOSPC)
+ mlog_errno(ret);
+ goto out;
+ }
+
+out:
+ if (ret) {
+ if (*meta_ac) {
+ ocfs2_free_alloc_context(*meta_ac);
+ *meta_ac = NULL;
+ }
+
+ /*
+ * We cannot have an error and a non null *data_ac.
+ */
+ }
+
+ return ret;
+}
+
+/*
+ * Read the inode specified by blkno to get suballoc_slot and
+ * suballoc_bit.
+ */
+static int ocfs2_get_suballoc_slot_bit(struct ocfs2_super *osb, u64 blkno,
+ u16 *suballoc_slot, u64 *group_blkno,
+ u16 *suballoc_bit)
+{
+ int status;
+ struct buffer_head *inode_bh = NULL;
+ struct ocfs2_dinode *inode_fe;
+
+ trace_ocfs2_get_suballoc_slot_bit((unsigned long long)blkno);
+
+ /* dirty read disk */
+ status = ocfs2_read_blocks_sync(osb, blkno, 1, &inode_bh);
+ if (status < 0) {
+ mlog(ML_ERROR, "read block %llu failed %d\n",
+ (unsigned long long)blkno, status);
+ goto bail;
+ }
+
+ inode_fe = (struct ocfs2_dinode *) inode_bh->b_data;
+ if (!OCFS2_IS_VALID_DINODE(inode_fe)) {
+ mlog(ML_ERROR, "invalid inode %llu requested\n",
+ (unsigned long long)blkno);
+ status = -EINVAL;
+ goto bail;
+ }
+
+ if (le16_to_cpu(inode_fe->i_suballoc_slot) != (u16)OCFS2_INVALID_SLOT &&
+ (u32)le16_to_cpu(inode_fe->i_suballoc_slot) > osb->max_slots - 1) {
+ mlog(ML_ERROR, "inode %llu has invalid suballoc slot %u\n",
+ (unsigned long long)blkno,
+ (u32)le16_to_cpu(inode_fe->i_suballoc_slot));
+ status = -EINVAL;
+ goto bail;
+ }
+
+ if (suballoc_slot)
+ *suballoc_slot = le16_to_cpu(inode_fe->i_suballoc_slot);
+ if (suballoc_bit)
+ *suballoc_bit = le16_to_cpu(inode_fe->i_suballoc_bit);
+ if (group_blkno)
+ *group_blkno = le64_to_cpu(inode_fe->i_suballoc_loc);
+
+bail:
+ brelse(inode_bh);
+
+ if (status)
+ mlog_errno(status);
+ return status;
+}
+
+/*
+ * test whether bit is SET in allocator bitmap or not. on success, 0
+ * is returned and *res is 1 for SET; 0 otherwise. when fails, errno
+ * is returned and *res is meaningless. Call this after you have
+ * cluster locked against suballoc, or you may get a result based on
+ * non-up2date contents
+ */
+static int ocfs2_test_suballoc_bit(struct ocfs2_super *osb,
+ struct inode *suballoc,
+ struct buffer_head *alloc_bh,
+ u64 group_blkno, u64 blkno,
+ u16 bit, int *res)
+{
+ struct ocfs2_dinode *alloc_di;
+ struct ocfs2_group_desc *group;
+ struct buffer_head *group_bh = NULL;
+ u64 bg_blkno;
+ int status;
+
+ trace_ocfs2_test_suballoc_bit((unsigned long long)blkno,
+ (unsigned int)bit);
+
+ alloc_di = (struct ocfs2_dinode *)alloc_bh->b_data;
+ if ((bit + 1) > ocfs2_bits_per_group(&alloc_di->id2.i_chain)) {
+ mlog(ML_ERROR, "suballoc bit %u out of range of %u\n",
+ (unsigned int)bit,
+ ocfs2_bits_per_group(&alloc_di->id2.i_chain));
+ status = -EINVAL;
+ goto bail;
+ }
+
+ bg_blkno = group_blkno ? group_blkno :
+ ocfs2_which_suballoc_group(blkno, bit);
+ status = ocfs2_read_group_descriptor(suballoc, alloc_di, bg_blkno,
+ &group_bh);
+ if (status < 0) {
+ mlog(ML_ERROR, "read group %llu failed %d\n",
+ (unsigned long long)bg_blkno, status);
+ goto bail;
+ }
+
+ group = (struct ocfs2_group_desc *) group_bh->b_data;
+ *res = ocfs2_test_bit(bit, (unsigned long *)group->bg_bitmap);
+
+bail:
+ brelse(group_bh);
+
+ if (status)
+ mlog_errno(status);
+ return status;
+}
+
+/*
+ * Test if the bit representing this inode (blkno) is set in the
+ * suballocator.
+ *
+ * On success, 0 is returned and *res is 1 for SET; 0 otherwise.
+ *
+ * In the event of failure, a negative value is returned and *res is
+ * meaningless.
+ *
+ * Callers must make sure to hold nfs_sync_lock to prevent
+ * ocfs2_delete_inode() on another node from accessing the same
+ * suballocator concurrently.
+ */
+int ocfs2_test_inode_bit(struct ocfs2_super *osb, u64 blkno, int *res)
+{
+ int status;
+ u64 group_blkno = 0;
+ u16 suballoc_bit = 0, suballoc_slot = 0;
+ struct inode *inode_alloc_inode;
+ struct buffer_head *alloc_bh = NULL;
+
+ trace_ocfs2_test_inode_bit((unsigned long long)blkno);
+
+ status = ocfs2_get_suballoc_slot_bit(osb, blkno, &suballoc_slot,
+ &group_blkno, &suballoc_bit);
+ if (status < 0) {
+ mlog(ML_ERROR, "get alloc slot and bit failed %d\n", status);
+ goto bail;
+ }
+
+ inode_alloc_inode =
+ ocfs2_get_system_file_inode(osb, INODE_ALLOC_SYSTEM_INODE,
+ suballoc_slot);
+ if (!inode_alloc_inode) {
+ /* the error code could be inaccurate, but we are not able to
+ * get the correct one. */
+ status = -EINVAL;
+ mlog(ML_ERROR, "unable to get alloc inode in slot %u\n",
+ (u32)suballoc_slot);
+ goto bail;
+ }
+
+ inode_lock(inode_alloc_inode);
+ status = ocfs2_inode_lock(inode_alloc_inode, &alloc_bh, 0);
+ if (status < 0) {
+ inode_unlock(inode_alloc_inode);
+ iput(inode_alloc_inode);
+ mlog(ML_ERROR, "lock on alloc inode on slot %u failed %d\n",
+ (u32)suballoc_slot, status);
+ goto bail;
+ }
+
+ status = ocfs2_test_suballoc_bit(osb, inode_alloc_inode, alloc_bh,
+ group_blkno, blkno, suballoc_bit, res);
+ if (status < 0)
+ mlog(ML_ERROR, "test suballoc bit failed %d\n", status);
+
+ ocfs2_inode_unlock(inode_alloc_inode, 0);
+ inode_unlock(inode_alloc_inode);
+
+ iput(inode_alloc_inode);
+ brelse(alloc_bh);
+bail:
+ if (status)
+ mlog_errno(status);
+ return status;
+}