diff options
Diffstat (limited to 'ANDROID_3.4.5/fs/ocfs2/suballoc.c')
| -rw-r--r-- | ANDROID_3.4.5/fs/ocfs2/suballoc.c | 2908 |
1 files changed, 0 insertions, 2908 deletions
diff --git a/ANDROID_3.4.5/fs/ocfs2/suballoc.c b/ANDROID_3.4.5/fs/ocfs2/suballoc.c deleted file mode 100644 index f169da46..00000000 --- a/ANDROID_3.4.5/fs/ocfs2/suballoc.c +++ /dev/null @@ -1,2908 +0,0 @@ -/* -*- 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 void ocfs2_debug_bg(struct ocfs2_group_desc *bg); -static inline void ocfs2_debug_suballoc_inode(struct ocfs2_dinode *fe); -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 inline 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); -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); - - mutex_unlock(&inode->i_mutex); - - iput(inode); - ac->ac_inode = NULL; - } - brelse(ac->ac_bh); - ac->ac_bh = NULL; - ac->ac_resv = NULL; - if (ac->ac_find_loc_priv) { - 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 "\n", ##__VA_ARGS__); \ - else \ - 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", - (unsigned long long)bh->b_blocknr, 7, - gd->bg_signature); - return -EINVAL; - } - - if (le64_to_cpu(gd->bg_blkno) != bh->b_blocknr) { - do_error("Group descriptor #%llu has an invalid bg_blkno " - "of %llu", - (unsigned long long)bh->b_blocknr, - (unsigned long long)le64_to_cpu(gd->bg_blkno)); - return -EINVAL; - } - - if (le32_to_cpu(gd->bg_generation) != OCFS2_SB(sb)->fs_generation) { - do_error("Group descriptor #%llu has an invalid " - "fs_generation of #%u", - (unsigned long long)bh->b_blocknr, - le32_to_cpu(gd->bg_generation)); - return -EINVAL; - } - - 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", - (unsigned long long)bh->b_blocknr, - le16_to_cpu(gd->bg_bits), - le16_to_cpu(gd->bg_free_bits_count)); - return -EINVAL; - } - - 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", - (unsigned long long)bh->b_blocknr, - le16_to_cpu(gd->bg_bits), - 8 * le16_to_cpu(gd->bg_size)); - return -EINVAL; - } - - 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)", - (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)); - return -EINVAL; - } - - 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", - (unsigned long long)bh->b_blocknr, - le16_to_cpu(gd->bg_bits)); - return -EINVAL; - } - - /* 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", - (unsigned long long)bh->b_blocknr, - le16_to_cpu(gd->bg_chain)); - return -EINVAL; - } - - 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) { - ocfs2_error(alloc_inode->i_sb, "group block (%llu) != " - "b_blocknr (%llu)", - (unsigned long long)group_blkno, - (unsigned long long) bg_bh->b_blocknr); - status = -EIO; - 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(OCFS2_SB(sb)->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 = -EIO; - 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_allow_chain_relink = 0; - - /* 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 = -EIO; - 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); - - 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; - } - - mutex_lock(&alloc_inode->i_mutex); - - status = ocfs2_inode_lock(alloc_inode, &bh, 1); - if (status < 0) { - mutex_unlock(&alloc_inode->i_mutex); - 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))) { - ocfs2_error(alloc_inode->i_sb, "Invalid chain allocator %llu", - (unsigned long long)le64_to_cpu(fe->i_blkno)); - status = -EIO; - 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); - goto bail; - } - -bail: - 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; - - *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) { - status = ocfs2_reserve_cluster_bitmap_bits(osb, *ac); - 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; -} - -static inline 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)) { - ocfs2_error(alloc_inode->i_sb, "Group descriptor # %llu has bit" - " count %u but claims %u are freed. num_bits %d", - (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); - return -EROFS; - } - while(num_bits--) - ocfs2_set_bit(bit_off++, bitmap); - - ocfs2_journal_dirty(handle, group_bh); - -bail: - if (status) - mlog_errno(status); - 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 fe_ptr, 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)); - - fe_ptr = le64_to_cpu(fe->id2.i_chain.cl_recs[chain].c_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) { - mlog_errno(status); - goto out_rollback; - } - - 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) { - mlog_errno(status); - goto out_rollback; - } - - 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) { - mlog_errno(status); - goto out_rollback; - } - - fe->id2.i_chain.cl_recs[chain].c_blkno = bg->bg_blkno; - ocfs2_journal_dirty(handle, fe_bh); - -out_rollback: - if (status < 0) { - fe->id2.i_chain.cl_recs[chain].c_blkno = cpu_to_le64(fe_ptr); - bg->bg_next_group = cpu_to_le64(bg_ptr); - prev_bg->bg_next_group = cpu_to_le64(prev_bg_ptr); - } - - if (status) - mlog_errno(status); - return status; -} - -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(OCFS2_SB(inode->i_sb), - 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; -} - -static 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; -} - -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) - 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_allow_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) { - 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)) { - ocfs2_error(ac->ac_inode->i_sb, - "Chain allocator dinode %llu has %u used " - "bits but only %u total.", - (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)); - status = -EIO; - 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; - ac->ac_allow_chain_relink = 1; - - status = ocfs2_search_chain(ac, handle, bits_wanted, min_bits, - res, &bits_left); - if (!status) { - 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_allow_chain_relink = 0; - 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; - -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) { - 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)) { - ocfs2_error(alloc_inode->i_sb, "Group descriptor # %llu has bit" - " count %u but claims %u are freed. num_bits %d", - (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); - return -EROFS; - } - - 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); - 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; - struct ocfs2_dinode *fe; - - /* 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))); - - fe = (struct ocfs2_dinode *) bitmap_bh->b_data; - - 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); -} - -static inline void ocfs2_debug_bg(struct ocfs2_group_desc *bg) -{ - printk("Block Group:\n"); - printk("bg_signature: %s\n", bg->bg_signature); - printk("bg_size: %u\n", bg->bg_size); - printk("bg_bits: %u\n", bg->bg_bits); - printk("bg_free_bits_count: %u\n", bg->bg_free_bits_count); - printk("bg_chain: %u\n", bg->bg_chain); - printk("bg_generation: %u\n", le32_to_cpu(bg->bg_generation)); - printk("bg_next_group: %llu\n", - (unsigned long long)bg->bg_next_group); - printk("bg_parent_dinode: %llu\n", - (unsigned long long)bg->bg_parent_dinode); - printk("bg_blkno: %llu\n", - (unsigned long long)bg->bg_blkno); -} - -static inline void ocfs2_debug_suballoc_inode(struct ocfs2_dinode *fe) -{ - int i; - - printk("Suballoc Inode %llu:\n", (unsigned long long)fe->i_blkno); - printk("i_signature: %s\n", fe->i_signature); - printk("i_size: %llu\n", - (unsigned long long)fe->i_size); - printk("i_clusters: %u\n", fe->i_clusters); - printk("i_generation: %u\n", - le32_to_cpu(fe->i_generation)); - printk("id1.bitmap1.i_used: %u\n", - le32_to_cpu(fe->id1.bitmap1.i_used)); - printk("id1.bitmap1.i_total: %u\n", - le32_to_cpu(fe->id1.bitmap1.i_total)); - printk("id2.i_chain.cl_cpg: %u\n", fe->id2.i_chain.cl_cpg); - printk("id2.i_chain.cl_bpc: %u\n", fe->id2.i_chain.cl_bpc); - printk("id2.i_chain.cl_count: %u\n", fe->id2.i_chain.cl_count); - printk("id2.i_chain.cl_next_free_rec: %u\n", - fe->id2.i_chain.cl_next_free_rec); - for(i = 0; i < fe->id2.i_chain.cl_next_free_rec; i++) { - printk("fe->id2.i_chain.cl_recs[%d].c_free: %u\n", i, - fe->id2.i_chain.cl_recs[i].c_free); - printk("fe->id2.i_chain.cl_recs[%d].c_total: %u\n", i, - fe->id2.i_chain.cl_recs[i].c_total); - printk("fe->id2.i_chain.cl_recs[%d].c_blkno: %llu\n", i, - (unsigned long long)fe->id2.i_chain.cl_recs[i].c_blkno); - } -} - -/* - * 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(osb, 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; - } - - mutex_lock(&inode_alloc_inode->i_mutex); - status = ocfs2_inode_lock(inode_alloc_inode, &alloc_bh, 0); - if (status < 0) { - mutex_unlock(&inode_alloc_inode->i_mutex); - 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); - mutex_unlock(&inode_alloc_inode->i_mutex); - - iput(inode_alloc_inode); - brelse(alloc_bh); -bail: - if (status) - mlog_errno(status); - return status; -} |