From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- fs/ocfs2/resize.c | 582 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 582 insertions(+) create mode 100644 fs/ocfs2/resize.c (limited to 'fs/ocfs2/resize.c') diff --git a/fs/ocfs2/resize.c b/fs/ocfs2/resize.c new file mode 100644 index 000000000..d65d43c61 --- /dev/null +++ b/fs/ocfs2/resize.c @@ -0,0 +1,582 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * resize.c + * + * volume resize. + * Inspired by ext3/resize.c. + * + * Copyright (C) 2007 Oracle. All rights reserved. + */ + +#include +#include + +#include + +#include "ocfs2.h" + +#include "alloc.h" +#include "dlmglue.h" +#include "inode.h" +#include "journal.h" +#include "super.h" +#include "sysfile.h" +#include "uptodate.h" +#include "ocfs2_trace.h" + +#include "buffer_head_io.h" +#include "suballoc.h" +#include "resize.h" + +/* + * Check whether there are new backup superblocks exist + * in the last group. If there are some, mark them or clear + * them in the bitmap. + * + * Return how many backups we find in the last group. + */ +static u16 ocfs2_calc_new_backup_super(struct inode *inode, + struct ocfs2_group_desc *gd, + u16 cl_cpg, + u16 old_bg_clusters, + int set) +{ + int i; + u16 backups = 0; + u32 cluster, lgd_cluster; + u64 blkno, gd_blkno, lgd_blkno = le64_to_cpu(gd->bg_blkno); + + for (i = 0; i < OCFS2_MAX_BACKUP_SUPERBLOCKS; i++) { + blkno = ocfs2_backup_super_blkno(inode->i_sb, i); + cluster = ocfs2_blocks_to_clusters(inode->i_sb, blkno); + + gd_blkno = ocfs2_which_cluster_group(inode, cluster); + if (gd_blkno < lgd_blkno) + continue; + else if (gd_blkno > lgd_blkno) + break; + + /* check if already done backup super */ + lgd_cluster = ocfs2_blocks_to_clusters(inode->i_sb, lgd_blkno); + lgd_cluster += old_bg_clusters; + if (lgd_cluster >= cluster) + continue; + + if (set) + ocfs2_set_bit(cluster % cl_cpg, + (unsigned long *)gd->bg_bitmap); + else + ocfs2_clear_bit(cluster % cl_cpg, + (unsigned long *)gd->bg_bitmap); + backups++; + } + + return backups; +} + +static int ocfs2_update_last_group_and_inode(handle_t *handle, + struct inode *bm_inode, + struct buffer_head *bm_bh, + struct buffer_head *group_bh, + u32 first_new_cluster, + int new_clusters) +{ + int ret = 0; + struct ocfs2_super *osb = OCFS2_SB(bm_inode->i_sb); + struct ocfs2_dinode *fe = (struct ocfs2_dinode *) bm_bh->b_data; + struct ocfs2_chain_list *cl = &fe->id2.i_chain; + struct ocfs2_chain_rec *cr; + struct ocfs2_group_desc *group; + u16 chain, num_bits, backups = 0; + u16 cl_bpc = le16_to_cpu(cl->cl_bpc); + u16 cl_cpg = le16_to_cpu(cl->cl_cpg); + u16 old_bg_clusters; + + trace_ocfs2_update_last_group_and_inode(new_clusters, + first_new_cluster); + + ret = ocfs2_journal_access_gd(handle, INODE_CACHE(bm_inode), + group_bh, OCFS2_JOURNAL_ACCESS_WRITE); + if (ret < 0) { + mlog_errno(ret); + goto out; + } + + group = (struct ocfs2_group_desc *)group_bh->b_data; + + old_bg_clusters = le16_to_cpu(group->bg_bits) / cl_bpc; + /* update the group first. */ + num_bits = new_clusters * cl_bpc; + le16_add_cpu(&group->bg_bits, num_bits); + le16_add_cpu(&group->bg_free_bits_count, num_bits); + + /* + * check whether there are some new backup superblocks exist in + * this group and update the group bitmap accordingly. + */ + if (OCFS2_HAS_COMPAT_FEATURE(osb->sb, + OCFS2_FEATURE_COMPAT_BACKUP_SB)) { + backups = ocfs2_calc_new_backup_super(bm_inode, + group, + cl_cpg, old_bg_clusters, 1); + le16_add_cpu(&group->bg_free_bits_count, -1 * backups); + } + + ocfs2_journal_dirty(handle, group_bh); + + /* update the inode accordingly. */ + ret = ocfs2_journal_access_di(handle, INODE_CACHE(bm_inode), bm_bh, + OCFS2_JOURNAL_ACCESS_WRITE); + if (ret < 0) { + mlog_errno(ret); + goto out_rollback; + } + + chain = le16_to_cpu(group->bg_chain); + cr = (&cl->cl_recs[chain]); + le32_add_cpu(&cr->c_total, num_bits); + le32_add_cpu(&cr->c_free, num_bits); + le32_add_cpu(&fe->id1.bitmap1.i_total, num_bits); + le32_add_cpu(&fe->i_clusters, new_clusters); + + if (backups) { + le32_add_cpu(&cr->c_free, -1 * backups); + le32_add_cpu(&fe->id1.bitmap1.i_used, backups); + } + + spin_lock(&OCFS2_I(bm_inode)->ip_lock); + OCFS2_I(bm_inode)->ip_clusters = le32_to_cpu(fe->i_clusters); + le64_add_cpu(&fe->i_size, (u64)new_clusters << osb->s_clustersize_bits); + spin_unlock(&OCFS2_I(bm_inode)->ip_lock); + i_size_write(bm_inode, le64_to_cpu(fe->i_size)); + + ocfs2_journal_dirty(handle, bm_bh); + +out_rollback: + if (ret < 0) { + ocfs2_calc_new_backup_super(bm_inode, + group, + cl_cpg, old_bg_clusters, 0); + le16_add_cpu(&group->bg_free_bits_count, backups); + le16_add_cpu(&group->bg_bits, -1 * num_bits); + le16_add_cpu(&group->bg_free_bits_count, -1 * num_bits); + } +out: + if (ret) + mlog_errno(ret); + return ret; +} + +static int update_backups(struct inode * inode, u32 clusters, char *data) +{ + int i, ret = 0; + u32 cluster; + u64 blkno; + struct buffer_head *backup = NULL; + struct ocfs2_dinode *backup_di = NULL; + struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); + + /* calculate the real backups we need to update. */ + for (i = 0; i < OCFS2_MAX_BACKUP_SUPERBLOCKS; i++) { + blkno = ocfs2_backup_super_blkno(inode->i_sb, i); + cluster = ocfs2_blocks_to_clusters(inode->i_sb, blkno); + if (cluster >= clusters) + break; + + ret = ocfs2_read_blocks_sync(osb, blkno, 1, &backup); + if (ret < 0) { + mlog_errno(ret); + break; + } + + memcpy(backup->b_data, data, inode->i_sb->s_blocksize); + + backup_di = (struct ocfs2_dinode *)backup->b_data; + backup_di->i_blkno = cpu_to_le64(blkno); + + ret = ocfs2_write_super_or_backup(osb, backup); + brelse(backup); + backup = NULL; + if (ret < 0) { + mlog_errno(ret); + break; + } + } + + return ret; +} + +static void ocfs2_update_super_and_backups(struct inode *inode, + int new_clusters) +{ + int ret; + u32 clusters = 0; + struct buffer_head *super_bh = NULL; + struct ocfs2_dinode *super_di = NULL; + struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); + + /* + * update the superblock last. + * It doesn't matter if the write failed. + */ + ret = ocfs2_read_blocks_sync(osb, OCFS2_SUPER_BLOCK_BLKNO, 1, + &super_bh); + if (ret < 0) { + mlog_errno(ret); + goto out; + } + + super_di = (struct ocfs2_dinode *)super_bh->b_data; + le32_add_cpu(&super_di->i_clusters, new_clusters); + clusters = le32_to_cpu(super_di->i_clusters); + + ret = ocfs2_write_super_or_backup(osb, super_bh); + if (ret < 0) { + mlog_errno(ret); + goto out; + } + + if (OCFS2_HAS_COMPAT_FEATURE(osb->sb, OCFS2_FEATURE_COMPAT_BACKUP_SB)) + ret = update_backups(inode, clusters, super_bh->b_data); + +out: + brelse(super_bh); + if (ret) + printk(KERN_WARNING "ocfs2: Failed to update super blocks on %s" + " during fs resize. This condition is not fatal," + " but fsck.ocfs2 should be run to fix it\n", + osb->dev_str); + return; +} + +/* + * Extend the filesystem to the new number of clusters specified. This entry + * point is only used to extend the current filesystem to the end of the last + * existing group. + */ +int ocfs2_group_extend(struct inode * inode, int new_clusters) +{ + int ret; + handle_t *handle; + struct buffer_head *main_bm_bh = NULL; + struct buffer_head *group_bh = NULL; + struct inode *main_bm_inode = NULL; + struct ocfs2_dinode *fe = NULL; + struct ocfs2_group_desc *group = NULL; + struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); + u16 cl_bpc; + u32 first_new_cluster; + u64 lgd_blkno; + + if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb)) + return -EROFS; + + if (new_clusters < 0) + return -EINVAL; + else if (new_clusters == 0) + return 0; + + main_bm_inode = ocfs2_get_system_file_inode(osb, + GLOBAL_BITMAP_SYSTEM_INODE, + OCFS2_INVALID_SLOT); + if (!main_bm_inode) { + ret = -EINVAL; + mlog_errno(ret); + goto out; + } + + inode_lock(main_bm_inode); + + ret = ocfs2_inode_lock(main_bm_inode, &main_bm_bh, 1); + if (ret < 0) { + mlog_errno(ret); + goto out_mutex; + } + + fe = (struct ocfs2_dinode *)main_bm_bh->b_data; + + /* main_bm_bh is validated by inode read inside ocfs2_inode_lock(), + * so any corruption is a code bug. */ + BUG_ON(!OCFS2_IS_VALID_DINODE(fe)); + + if (le16_to_cpu(fe->id2.i_chain.cl_cpg) != + ocfs2_group_bitmap_size(osb->sb, 0, + osb->s_feature_incompat) * 8) { + mlog(ML_ERROR, "The disk is too old and small. " + "Force to do offline resize."); + ret = -EINVAL; + goto out_unlock; + } + + first_new_cluster = le32_to_cpu(fe->i_clusters); + lgd_blkno = ocfs2_which_cluster_group(main_bm_inode, + first_new_cluster - 1); + + ret = ocfs2_read_group_descriptor(main_bm_inode, fe, lgd_blkno, + &group_bh); + if (ret < 0) { + mlog_errno(ret); + goto out_unlock; + } + group = (struct ocfs2_group_desc *)group_bh->b_data; + + cl_bpc = le16_to_cpu(fe->id2.i_chain.cl_bpc); + if (le16_to_cpu(group->bg_bits) / cl_bpc + new_clusters > + le16_to_cpu(fe->id2.i_chain.cl_cpg)) { + ret = -EINVAL; + goto out_unlock; + } + + + trace_ocfs2_group_extend( + (unsigned long long)le64_to_cpu(group->bg_blkno), new_clusters); + + handle = ocfs2_start_trans(osb, OCFS2_GROUP_EXTEND_CREDITS); + if (IS_ERR(handle)) { + mlog_errno(PTR_ERR(handle)); + ret = -EINVAL; + goto out_unlock; + } + + /* update the last group descriptor and inode. */ + ret = ocfs2_update_last_group_and_inode(handle, main_bm_inode, + main_bm_bh, group_bh, + first_new_cluster, + new_clusters); + if (ret) { + mlog_errno(ret); + goto out_commit; + } + + ocfs2_update_super_and_backups(main_bm_inode, new_clusters); + +out_commit: + ocfs2_commit_trans(osb, handle); +out_unlock: + brelse(group_bh); + brelse(main_bm_bh); + + ocfs2_inode_unlock(main_bm_inode, 1); + +out_mutex: + inode_unlock(main_bm_inode); + iput(main_bm_inode); + +out: + return ret; +} + +static int ocfs2_check_new_group(struct inode *inode, + struct ocfs2_dinode *di, + struct ocfs2_new_group_input *input, + struct buffer_head *group_bh) +{ + int ret; + struct ocfs2_group_desc *gd = + (struct ocfs2_group_desc *)group_bh->b_data; + u16 cl_bpc = le16_to_cpu(di->id2.i_chain.cl_bpc); + + ret = ocfs2_check_group_descriptor(inode->i_sb, di, group_bh); + if (ret) + goto out; + + ret = -EINVAL; + if (le16_to_cpu(gd->bg_chain) != input->chain) + mlog(ML_ERROR, "Group descriptor # %llu has bad chain %u " + "while input has %u set.\n", + (unsigned long long)le64_to_cpu(gd->bg_blkno), + le16_to_cpu(gd->bg_chain), input->chain); + else if (le16_to_cpu(gd->bg_bits) != input->clusters * cl_bpc) + mlog(ML_ERROR, "Group descriptor # %llu has bit count %u but " + "input has %u clusters set\n", + (unsigned long long)le64_to_cpu(gd->bg_blkno), + le16_to_cpu(gd->bg_bits), input->clusters); + else if (le16_to_cpu(gd->bg_free_bits_count) != input->frees * cl_bpc) + mlog(ML_ERROR, "Group descriptor # %llu has free bit count %u " + "but it should have %u set\n", + (unsigned long long)le64_to_cpu(gd->bg_blkno), + le16_to_cpu(gd->bg_bits), + input->frees * cl_bpc); + else + ret = 0; + +out: + return ret; +} + +static int ocfs2_verify_group_and_input(struct inode *inode, + struct ocfs2_dinode *di, + struct ocfs2_new_group_input *input, + struct buffer_head *group_bh) +{ + u16 cl_count = le16_to_cpu(di->id2.i_chain.cl_count); + u16 cl_cpg = le16_to_cpu(di->id2.i_chain.cl_cpg); + u16 next_free = le16_to_cpu(di->id2.i_chain.cl_next_free_rec); + u32 cluster = ocfs2_blocks_to_clusters(inode->i_sb, input->group); + u32 total_clusters = le32_to_cpu(di->i_clusters); + int ret = -EINVAL; + + if (cluster < total_clusters) + mlog(ML_ERROR, "add a group which is in the current volume.\n"); + else if (input->chain >= cl_count) + mlog(ML_ERROR, "input chain exceeds the limit.\n"); + else if (next_free != cl_count && next_free != input->chain) + mlog(ML_ERROR, + "the add group should be in chain %u\n", next_free); + else if (total_clusters + input->clusters < total_clusters) + mlog(ML_ERROR, "add group's clusters overflow.\n"); + else if (input->clusters > cl_cpg) + mlog(ML_ERROR, "the cluster exceeds the maximum of a group\n"); + else if (input->frees > input->clusters) + mlog(ML_ERROR, "the free cluster exceeds the total clusters\n"); + else if (total_clusters % cl_cpg != 0) + mlog(ML_ERROR, + "the last group isn't full. Use group extend first.\n"); + else if (input->group != ocfs2_which_cluster_group(inode, cluster)) + mlog(ML_ERROR, "group blkno is invalid\n"); + else if ((ret = ocfs2_check_new_group(inode, di, input, group_bh))) + mlog(ML_ERROR, "group descriptor check failed.\n"); + else + ret = 0; + + return ret; +} + +/* Add a new group descriptor to global_bitmap. */ +int ocfs2_group_add(struct inode *inode, struct ocfs2_new_group_input *input) +{ + int ret; + handle_t *handle; + struct buffer_head *main_bm_bh = NULL; + struct inode *main_bm_inode = NULL; + struct ocfs2_dinode *fe = NULL; + struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); + struct buffer_head *group_bh = NULL; + struct ocfs2_group_desc *group = NULL; + struct ocfs2_chain_list *cl; + struct ocfs2_chain_rec *cr; + u16 cl_bpc; + u64 bg_ptr; + + if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb)) + return -EROFS; + + main_bm_inode = ocfs2_get_system_file_inode(osb, + GLOBAL_BITMAP_SYSTEM_INODE, + OCFS2_INVALID_SLOT); + if (!main_bm_inode) { + ret = -EINVAL; + mlog_errno(ret); + goto out; + } + + inode_lock(main_bm_inode); + + ret = ocfs2_inode_lock(main_bm_inode, &main_bm_bh, 1); + if (ret < 0) { + mlog_errno(ret); + goto out_mutex; + } + + fe = (struct ocfs2_dinode *)main_bm_bh->b_data; + + if (le16_to_cpu(fe->id2.i_chain.cl_cpg) != + ocfs2_group_bitmap_size(osb->sb, 0, + osb->s_feature_incompat) * 8) { + mlog(ML_ERROR, "The disk is too old and small." + " Force to do offline resize."); + ret = -EINVAL; + goto out_unlock; + } + + ret = ocfs2_read_blocks_sync(osb, input->group, 1, &group_bh); + if (ret < 0) { + mlog(ML_ERROR, "Can't read the group descriptor # %llu " + "from the device.", (unsigned long long)input->group); + goto out_unlock; + } + + ocfs2_set_new_buffer_uptodate(INODE_CACHE(inode), group_bh); + + ret = ocfs2_verify_group_and_input(main_bm_inode, fe, input, group_bh); + if (ret) { + mlog_errno(ret); + goto out_free_group_bh; + } + + trace_ocfs2_group_add((unsigned long long)input->group, + input->chain, input->clusters, input->frees); + + handle = ocfs2_start_trans(osb, OCFS2_GROUP_ADD_CREDITS); + if (IS_ERR(handle)) { + mlog_errno(PTR_ERR(handle)); + ret = -EINVAL; + goto out_free_group_bh; + } + + cl_bpc = le16_to_cpu(fe->id2.i_chain.cl_bpc); + cl = &fe->id2.i_chain; + cr = &cl->cl_recs[input->chain]; + + ret = ocfs2_journal_access_gd(handle, INODE_CACHE(main_bm_inode), + group_bh, OCFS2_JOURNAL_ACCESS_WRITE); + if (ret < 0) { + mlog_errno(ret); + goto out_commit; + } + + group = (struct ocfs2_group_desc *)group_bh->b_data; + bg_ptr = le64_to_cpu(group->bg_next_group); + group->bg_next_group = cr->c_blkno; + ocfs2_journal_dirty(handle, group_bh); + + ret = ocfs2_journal_access_di(handle, INODE_CACHE(main_bm_inode), + main_bm_bh, OCFS2_JOURNAL_ACCESS_WRITE); + if (ret < 0) { + group->bg_next_group = cpu_to_le64(bg_ptr); + mlog_errno(ret); + goto out_commit; + } + + if (input->chain == le16_to_cpu(cl->cl_next_free_rec)) { + le16_add_cpu(&cl->cl_next_free_rec, 1); + memset(cr, 0, sizeof(struct ocfs2_chain_rec)); + } + + cr->c_blkno = cpu_to_le64(input->group); + le32_add_cpu(&cr->c_total, input->clusters * cl_bpc); + le32_add_cpu(&cr->c_free, input->frees * cl_bpc); + + le32_add_cpu(&fe->id1.bitmap1.i_total, input->clusters *cl_bpc); + le32_add_cpu(&fe->id1.bitmap1.i_used, + (input->clusters - input->frees) * cl_bpc); + le32_add_cpu(&fe->i_clusters, input->clusters); + + ocfs2_journal_dirty(handle, main_bm_bh); + + spin_lock(&OCFS2_I(main_bm_inode)->ip_lock); + OCFS2_I(main_bm_inode)->ip_clusters = le32_to_cpu(fe->i_clusters); + le64_add_cpu(&fe->i_size, (u64)input->clusters << osb->s_clustersize_bits); + spin_unlock(&OCFS2_I(main_bm_inode)->ip_lock); + i_size_write(main_bm_inode, le64_to_cpu(fe->i_size)); + + ocfs2_update_super_and_backups(main_bm_inode, input->clusters); + +out_commit: + ocfs2_commit_trans(osb, handle); + +out_free_group_bh: + brelse(group_bh); + +out_unlock: + brelse(main_bm_bh); + + ocfs2_inode_unlock(main_bm_inode, 1); + +out_mutex: + inode_unlock(main_bm_inode); + iput(main_bm_inode); + +out: + return ret; +} -- cgit v1.2.3