| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Yongqiang Yang | 4250 | 40.76% | 22 | 13.75% |
| Dave Kleikamp | 2998 | 28.76% | 1 | 0.62% |
| Theodore Y. Ts'o | 1406 | 13.49% | 41 | 25.62% |
| Darrick J. Wong | 224 | 2.15% | 5 | 3.12% |
| Baokun Li | 212 | 2.03% | 5 | 3.12% |
| Jan Kara | 207 | 1.99% | 9 | 5.62% |
| Mingming Cao | 191 | 1.83% | 3 | 1.88% |
| Harshad Shirwadkar | 180 | 1.73% | 1 | 0.62% |
| Lukas Czerner | 159 | 1.53% | 8 | 5.00% |
| liang xie | 101 | 0.97% | 1 | 0.62% |
| Kiselev, Oleg | 82 | 0.79% | 2 | 1.25% |
| Randy Dunlap | 55 | 0.53% | 1 | 0.62% |
| KeMeng Shi | 46 | 0.44% | 7 | 4.38% |
| zhangyi (F) | 44 | 0.42% | 3 | 1.88% |
| Frederic Bohe | 33 | 0.32% | 3 | 1.88% |
| Vasily Averin | 30 | 0.29% | 4 | 2.50% |
| Josh Triplett | 22 | 0.21% | 2 | 1.25% |
| Laurent Vivier | 21 | 0.20% | 1 | 0.62% |
| Suraj Jitindar Singh | 18 | 0.17% | 1 | 0.62% |
| Shilong Wang | 15 | 0.14% | 1 | 0.62% |
| Frank Mayhar | 14 | 0.13% | 1 | 0.62% |
| Eric Sandeen | 13 | 0.12% | 3 | 1.88% |
| Josef Bacik | 9 | 0.09% | 3 | 1.88% |
| Maximilian Heyne | 9 | 0.09% | 1 | 0.62% |
| Jerry Lee | 7 | 0.07% | 2 | 1.25% |
| Wang Qing | 7 | 0.07% | 1 | 0.62% |
| Kees Cook | 6 | 0.06% | 1 | 0.62% |
| Pan Bian | 6 | 0.06% | 1 | 0.62% |
| Dmitriy Monakhov | 5 | 0.05% | 2 | 1.25% |
| Alex Tomas | 5 | 0.05% | 2 | 1.25% |
| Aneesh Kumar K.V | 5 | 0.05% | 2 | 1.25% |
| Marcin Ślusarz | 5 | 0.05% | 1 | 0.62% |
| Dinghao Liu | 5 | 0.05% | 1 | 0.62% |
| Dan Carpenter | 4 | 0.04% | 1 | 0.62% |
| Andreas Dilger | 4 | 0.04% | 1 | 0.62% |
| Srivathsa Dara | 4 | 0.04% | 1 | 0.62% |
| Andy Leiserson | 3 | 0.03% | 1 | 0.62% |
| Avantika Mathur | 3 | 0.03% | 1 | 0.62% |
| Solofo Ramangalahy | 3 | 0.03% | 1 | 0.62% |
| Christoph Hellwig | 3 | 0.03% | 1 | 0.62% |
| Ritesh Harjani | 2 | 0.02% | 1 | 0.62% |
| Peter Zijlstra | 2 | 0.02% | 2 | 1.25% |
| Jinpeng Cui | 1 | 0.01% | 1 | 0.62% |
| Greg Kroah-Hartman | 1 | 0.01% | 1 | 0.62% |
| Tao Ma | 1 | 0.01% | 1 | 0.62% |
| ruippan (潘睿) | 1 | 0.01% | 1 | 0.62% |
| Jun Piao | 1 | 0.01% | 1 | 0.62% |
| Jakub Wilk | 1 | 0.01% | 1 | 0.62% |
| Al Viro | 1 | 0.01% | 1 | 0.62% |
| Alexandre Ratchov | 1 | 0.01% | 1 | 0.62% |
| Total | 10426 | 160 |
// SPDX-License-Identifier: GPL-2.0 /* * linux/fs/ext4/resize.c * * Support for resizing an ext4 filesystem while it is mounted. * * Copyright (C) 2001, 2002 Andreas Dilger <adilger@clusterfs.com> * * This could probably be made into a module, because it is not often in use. */ #include <linux/errno.h> #include <linux/slab.h> #include <linux/jiffies.h> #include "ext4_jbd2.h" struct ext4_rcu_ptr { struct rcu_head rcu; void *ptr; }; static void ext4_rcu_ptr_callback(struct rcu_head *head) { struct ext4_rcu_ptr *ptr; ptr = container_of(head, struct ext4_rcu_ptr, rcu); kvfree(ptr->ptr); kfree(ptr); } void ext4_kvfree_array_rcu(void *to_free) { struct ext4_rcu_ptr *ptr = kzalloc(sizeof(*ptr), GFP_KERNEL); if (ptr) { ptr->ptr = to_free; call_rcu(&ptr->rcu, ext4_rcu_ptr_callback); return; } synchronize_rcu(); kvfree(to_free); } int ext4_resize_begin(struct super_block *sb) { struct ext4_sb_info *sbi = EXT4_SB(sb); int ret = 0; if (!capable(CAP_SYS_RESOURCE)) return -EPERM; /* * If the reserved GDT blocks is non-zero, the resize_inode feature * should always be set. */ if (sbi->s_es->s_reserved_gdt_blocks && !ext4_has_feature_resize_inode(sb)) { ext4_error(sb, "resize_inode disabled but reserved GDT blocks non-zero"); return -EFSCORRUPTED; } /* * If we are not using the primary superblock/GDT copy don't resize, * because the user tools have no way of handling this. Probably a * bad time to do it anyways. */ if (EXT4_B2C(sbi, sbi->s_sbh->b_blocknr) != le32_to_cpu(sbi->s_es->s_first_data_block)) { ext4_warning(sb, "won't resize using backup superblock at %llu", (unsigned long long)sbi->s_sbh->b_blocknr); return -EPERM; } /* * We are not allowed to do online-resizing on a filesystem mounted * with error, because it can destroy the filesystem easily. */ if (sbi->s_mount_state & EXT4_ERROR_FS) { ext4_warning(sb, "There are errors in the filesystem, " "so online resizing is not allowed"); return -EPERM; } if (ext4_has_feature_sparse_super2(sb)) { ext4_msg(sb, KERN_ERR, "Online resizing not supported with sparse_super2"); return -EOPNOTSUPP; } if (test_and_set_bit_lock(EXT4_FLAGS_RESIZING, &sbi->s_ext4_flags)) ret = -EBUSY; return ret; } int ext4_resize_end(struct super_block *sb, bool update_backups) { clear_bit_unlock(EXT4_FLAGS_RESIZING, &EXT4_SB(sb)->s_ext4_flags); smp_mb__after_atomic(); if (update_backups) return ext4_update_overhead(sb, true); return 0; } static ext4_grpblk_t ext4_group_overhead_blocks(struct super_block *sb, ext4_group_t group) { ext4_grpblk_t overhead; overhead = ext4_bg_num_gdb(sb, group); if (ext4_bg_has_super(sb, group)) overhead += 1 + le16_to_cpu(EXT4_SB(sb)->s_es->s_reserved_gdt_blocks); return overhead; } #define outside(b, first, last) ((b) < (first) || (b) >= (last)) #define inside(b, first, last) ((b) >= (first) && (b) < (last)) static int verify_group_input(struct super_block *sb, struct ext4_new_group_data *input) { struct ext4_sb_info *sbi = EXT4_SB(sb); struct ext4_super_block *es = sbi->s_es; ext4_fsblk_t start = ext4_blocks_count(es); ext4_fsblk_t end = start + input->blocks_count; ext4_group_t group = input->group; ext4_fsblk_t itend = input->inode_table + sbi->s_itb_per_group; unsigned overhead; ext4_fsblk_t metaend; struct buffer_head *bh = NULL; ext4_grpblk_t free_blocks_count, offset; int err = -EINVAL; if (group != sbi->s_groups_count) { ext4_warning(sb, "Cannot add at group %u (only %u groups)", input->group, sbi->s_groups_count); return -EINVAL; } overhead = ext4_group_overhead_blocks(sb, group); metaend = start + overhead; free_blocks_count = input->blocks_count - 2 - overhead - sbi->s_itb_per_group; input->free_clusters_count = EXT4_B2C(sbi, free_blocks_count); if (test_opt(sb, DEBUG)) printk(KERN_DEBUG "EXT4-fs: adding %s group %u: %u blocks " "(%d free, %u reserved)\n", ext4_bg_has_super(sb, input->group) ? "normal" : "no-super", input->group, input->blocks_count, free_blocks_count, input->reserved_blocks); ext4_get_group_no_and_offset(sb, start, NULL, &offset); if (offset != 0) ext4_warning(sb, "Last group not full"); else if (input->reserved_blocks > input->blocks_count / 5) ext4_warning(sb, "Reserved blocks too high (%u)", input->reserved_blocks); else if (free_blocks_count < 0) ext4_warning(sb, "Bad blocks count %u", input->blocks_count); else if (IS_ERR(bh = ext4_sb_bread(sb, end - 1, 0))) { err = PTR_ERR(bh); bh = NULL; ext4_warning(sb, "Cannot read last block (%llu)", end - 1); } else if (outside(input->block_bitmap, start, end)) ext4_warning(sb, "Block bitmap not in group (block %llu)", (unsigned long long)input->block_bitmap); else if (outside(input->inode_bitmap, start, end)) ext4_warning(sb, "Inode bitmap not in group (block %llu)", (unsigned long long)input->inode_bitmap); else if (outside(input->inode_table, start, end) || outside(itend - 1, start, end)) ext4_warning(sb, "Inode table not in group (blocks %llu-%llu)", (unsigned long long)input->inode_table, itend - 1); else if (input->inode_bitmap == input->block_bitmap) ext4_warning(sb, "Block bitmap same as inode bitmap (%llu)", (unsigned long long)input->block_bitmap); else if (inside(input->block_bitmap, input->inode_table, itend)) ext4_warning(sb, "Block bitmap (%llu) in inode table " "(%llu-%llu)", (unsigned long long)input->block_bitmap, (unsigned long long)input->inode_table, itend - 1); else if (inside(input->inode_bitmap, input->inode_table, itend)) ext4_warning(sb, "Inode bitmap (%llu) in inode table " "(%llu-%llu)", (unsigned long long)input->inode_bitmap, (unsigned long long)input->inode_table, itend - 1); else if (inside(input->block_bitmap, start, metaend)) ext4_warning(sb, "Block bitmap (%llu) in GDT table (%llu-%llu)", (unsigned long long)input->block_bitmap, start, metaend - 1); else if (inside(input->inode_bitmap, start, metaend)) ext4_warning(sb, "Inode bitmap (%llu) in GDT table (%llu-%llu)", (unsigned long long)input->inode_bitmap, start, metaend - 1); else if (inside(input->inode_table, start, metaend) || inside(itend - 1, start, metaend)) ext4_warning(sb, "Inode table (%llu-%llu) overlaps GDT table " "(%llu-%llu)", (unsigned long long)input->inode_table, itend - 1, start, metaend - 1); else err = 0; brelse(bh); return err; } /* * ext4_new_flex_group_data is used by 64bit-resize interface to add a flex * group each time. */ struct ext4_new_flex_group_data { struct ext4_new_group_data *groups; /* new_group_data for groups in the flex group */ __u16 *bg_flags; /* block group flags of groups in @groups */ ext4_group_t resize_bg; /* number of allocated new_group_data */ ext4_group_t count; /* number of groups in @groups */ }; /* * Avoiding memory allocation failures due to too many groups added each time. */ #define MAX_RESIZE_BG 16384 /* * alloc_flex_gd() allocates a ext4_new_flex_group_data with size of * @flexbg_size. * * Returns NULL on failure otherwise address of the allocated structure. */ static struct ext4_new_flex_group_data *alloc_flex_gd(unsigned int flexbg_size, ext4_group_t o_group, ext4_group_t n_group) { ext4_group_t last_group; struct ext4_new_flex_group_data *flex_gd; flex_gd = kmalloc(sizeof(*flex_gd), GFP_NOFS); if (flex_gd == NULL) goto out3; if (unlikely(flexbg_size > MAX_RESIZE_BG)) flex_gd->resize_bg = MAX_RESIZE_BG; else flex_gd->resize_bg = flexbg_size; /* Avoid allocating large 'groups' array if not needed */ last_group = o_group | (flex_gd->resize_bg - 1); if (n_group <= last_group) flex_gd->resize_bg = 1 << fls(n_group - o_group + 1); else if (n_group - last_group < flex_gd->resize_bg) flex_gd->resize_bg = 1 << max(fls(last_group - o_group + 1), fls(n_group - last_group)); flex_gd->groups = kmalloc_array(flex_gd->resize_bg, sizeof(struct ext4_new_group_data), GFP_NOFS); if (flex_gd->groups == NULL) goto out2; flex_gd->bg_flags = kmalloc_array(flex_gd->resize_bg, sizeof(__u16), GFP_NOFS); if (flex_gd->bg_flags == NULL) goto out1; return flex_gd; out1: kfree(flex_gd->groups); out2: kfree(flex_gd); out3: return NULL; } static void free_flex_gd(struct ext4_new_flex_group_data *flex_gd) { kfree(flex_gd->bg_flags); kfree(flex_gd->groups); kfree(flex_gd); } /* * ext4_alloc_group_tables() allocates block bitmaps, inode bitmaps * and inode tables for a flex group. * * This function is used by 64bit-resize. Note that this function allocates * group tables from the 1st group of groups contained by @flexgd, which may * be a partial of a flex group. * * @sb: super block of fs to which the groups belongs * * Returns 0 on a successful allocation of the metadata blocks in the * block group. */ static int ext4_alloc_group_tables(struct super_block *sb, struct ext4_new_flex_group_data *flex_gd, unsigned int flexbg_size) { struct ext4_new_group_data *group_data = flex_gd->groups; ext4_fsblk_t start_blk; ext4_fsblk_t last_blk; ext4_group_t src_group; ext4_group_t bb_index = 0; ext4_group_t ib_index = 0; ext4_group_t it_index = 0; ext4_group_t group; ext4_group_t last_group; unsigned overhead; __u16 uninit_mask = (flexbg_size > 1) ? ~EXT4_BG_BLOCK_UNINIT : ~0; int i; BUG_ON(flex_gd->count == 0 || group_data == NULL); src_group = group_data[0].group; last_group = src_group + flex_gd->count - 1; BUG_ON((flexbg_size > 1) && ((src_group & ~(flexbg_size - 1)) != (last_group & ~(flexbg_size - 1)))); next_group: group = group_data[0].group; if (src_group >= group_data[0].group + flex_gd->count) return -ENOSPC; start_blk = ext4_group_first_block_no(sb, src_group); last_blk = start_blk + group_data[src_group - group].blocks_count; overhead = ext4_group_overhead_blocks(sb, src_group); start_blk += overhead; /* We collect contiguous blocks as much as possible. */ src_group++; for (; src_group <= last_group; src_group++) { overhead = ext4_group_overhead_blocks(sb, src_group); if (overhead == 0) last_blk += group_data[src_group - group].blocks_count; else break; } /* Allocate block bitmaps */ for (; bb_index < flex_gd->count; bb_index++) { if (start_blk >= last_blk) goto next_group; group_data[bb_index].block_bitmap = start_blk++; group = ext4_get_group_number(sb, start_blk - 1); group -= group_data[0].group; group_data[group].mdata_blocks++; flex_gd->bg_flags[group] &= uninit_mask; } /* Allocate inode bitmaps */ for (; ib_index < flex_gd->count; ib_index++) { if (start_blk >= last_blk) goto next_group; group_data[ib_index].inode_bitmap = start_blk++; group = ext4_get_group_number(sb, start_blk - 1); group -= group_data[0].group; group_data[group].mdata_blocks++; flex_gd->bg_flags[group] &= uninit_mask; } /* Allocate inode tables */ for (; it_index < flex_gd->count; it_index++) { unsigned int itb = EXT4_SB(sb)->s_itb_per_group; ext4_fsblk_t next_group_start; if (start_blk + itb > last_blk) goto next_group; group_data[it_index].inode_table = start_blk; group = ext4_get_group_number(sb, start_blk); next_group_start = ext4_group_first_block_no(sb, group + 1); group -= group_data[0].group; if (start_blk + itb > next_group_start) { flex_gd->bg_flags[group + 1] &= uninit_mask; overhead = start_blk + itb - next_group_start; group_data[group + 1].mdata_blocks += overhead; itb -= overhead; } group_data[group].mdata_blocks += itb; flex_gd->bg_flags[group] &= uninit_mask; start_blk += EXT4_SB(sb)->s_itb_per_group; } /* Update free clusters count to exclude metadata blocks */ for (i = 0; i < flex_gd->count; i++) { group_data[i].free_clusters_count -= EXT4_NUM_B2C(EXT4_SB(sb), group_data[i].mdata_blocks); } if (test_opt(sb, DEBUG)) { int i; group = group_data[0].group; printk(KERN_DEBUG "EXT4-fs: adding a flex group with " "%u groups, flexbg size is %u:\n", flex_gd->count, flexbg_size); for (i = 0; i < flex_gd->count; i++) { ext4_debug( "adding %s group %u: %u blocks (%u free, %u mdata blocks)\n", ext4_bg_has_super(sb, group + i) ? "normal" : "no-super", group + i, group_data[i].blocks_count, group_data[i].free_clusters_count, group_data[i].mdata_blocks); } } return 0; } static struct buffer_head *bclean(handle_t *handle, struct super_block *sb, ext4_fsblk_t blk) { struct buffer_head *bh; int err; bh = sb_getblk(sb, blk); if (unlikely(!bh)) return ERR_PTR(-ENOMEM); BUFFER_TRACE(bh, "get_write_access"); err = ext4_journal_get_write_access(handle, sb, bh, EXT4_JTR_NONE); if (err) { brelse(bh); bh = ERR_PTR(err); } else { memset(bh->b_data, 0, sb->s_blocksize); set_buffer_uptodate(bh); } return bh; } static int ext4_resize_ensure_credits_batch(handle_t *handle, int credits) { return ext4_journal_ensure_credits_fn(handle, credits, EXT4_MAX_TRANS_DATA, 0, 0); } /* * set_flexbg_block_bitmap() mark clusters [@first_cluster, @last_cluster] used. * * Helper function for ext4_setup_new_group_blocks() which set . * * @sb: super block * @handle: journal handle * @flex_gd: flex group data */ static int set_flexbg_block_bitmap(struct super_block *sb, handle_t *handle, struct ext4_new_flex_group_data *flex_gd, ext4_fsblk_t first_cluster, ext4_fsblk_t last_cluster) { struct ext4_sb_info *sbi = EXT4_SB(sb); ext4_group_t count = last_cluster - first_cluster + 1; ext4_group_t count2; ext4_debug("mark clusters [%llu-%llu] used\n", first_cluster, last_cluster); for (; count > 0; count -= count2, first_cluster += count2) { ext4_fsblk_t start; struct buffer_head *bh; ext4_group_t group; int err; group = ext4_get_group_number(sb, EXT4_C2B(sbi, first_cluster)); start = EXT4_B2C(sbi, ext4_group_first_block_no(sb, group)); group -= flex_gd->groups[0].group; count2 = EXT4_CLUSTERS_PER_GROUP(sb) - (first_cluster - start); if (count2 > count) count2 = count; if (flex_gd->bg_flags[group] & EXT4_BG_BLOCK_UNINIT) { BUG_ON(flex_gd->count > 1); continue; } err = ext4_resize_ensure_credits_batch(handle, 1); if (err < 0) return err; bh = sb_getblk(sb, flex_gd->groups[group].block_bitmap); if (unlikely(!bh)) return -ENOMEM; BUFFER_TRACE(bh, "get_write_access"); err = ext4_journal_get_write_access(handle, sb, bh, EXT4_JTR_NONE); if (err) { brelse(bh); return err; } ext4_debug("mark block bitmap %#04llx (+%llu/%u)\n", first_cluster, first_cluster - start, count2); mb_set_bits(bh->b_data, first_cluster - start, count2); err = ext4_handle_dirty_metadata(handle, NULL, bh); brelse(bh); if (unlikely(err)) return err; } return 0; } /* * Set up the block and inode bitmaps, and the inode table for the new groups. * This doesn't need to be part of the main transaction, since we are only * changing blocks outside the actual filesystem. We still do journaling to * ensure the recovery is correct in case of a failure just after resize. * If any part of this fails, we simply abort the resize. * * setup_new_flex_group_blocks handles a flex group as follow: * 1. copy super block and GDT, and initialize group tables if necessary. * In this step, we only set bits in blocks bitmaps for blocks taken by * super block and GDT. * 2. allocate group tables in block bitmaps, that is, set bits in block * bitmap for blocks taken by group tables. */ static int setup_new_flex_group_blocks(struct super_block *sb, struct ext4_new_flex_group_data *flex_gd) { int group_table_count[] = {1, 1, EXT4_SB(sb)->s_itb_per_group}; ext4_fsblk_t start; ext4_fsblk_t block; struct ext4_sb_info *sbi = EXT4_SB(sb); struct ext4_super_block *es = sbi->s_es; struct ext4_new_group_data *group_data = flex_gd->groups; __u16 *bg_flags = flex_gd->bg_flags; handle_t *handle; ext4_group_t group, count; struct buffer_head *bh = NULL; int reserved_gdb, i, j, err = 0, err2; int meta_bg; BUG_ON(!flex_gd->count || !group_data || group_data[0].group != sbi->s_groups_count); reserved_gdb = le16_to_cpu(es->s_reserved_gdt_blocks); meta_bg = ext4_has_feature_meta_bg(sb); /* This transaction may be extended/restarted along the way */ handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, EXT4_MAX_TRANS_DATA); if (IS_ERR(handle)) return PTR_ERR(handle); group = group_data[0].group; for (i = 0; i < flex_gd->count; i++, group++) { unsigned long gdblocks; ext4_grpblk_t overhead; gdblocks = ext4_bg_num_gdb(sb, group); start = ext4_group_first_block_no(sb, group); if (meta_bg == 0 && !ext4_bg_has_super(sb, group)) goto handle_itb; if (meta_bg == 1) goto handle_itb; block = start + ext4_bg_has_super(sb, group); /* Copy all of the GDT blocks into the backup in this group */ for (j = 0; j < gdblocks; j++, block++) { struct buffer_head *gdb; ext4_debug("update backup group %#04llx\n", block); err = ext4_resize_ensure_credits_batch(handle, 1); if (err < 0) goto out; gdb = sb_getblk(sb, block); if (unlikely(!gdb)) { err = -ENOMEM; goto out; } BUFFER_TRACE(gdb, "get_write_access"); err = ext4_journal_get_write_access(handle, sb, gdb, EXT4_JTR_NONE); if (err) { brelse(gdb); goto out; } memcpy(gdb->b_data, sbi_array_rcu_deref(sbi, s_group_desc, j)->b_data, gdb->b_size); set_buffer_uptodate(gdb); err = ext4_handle_dirty_metadata(handle, NULL, gdb); if (unlikely(err)) { brelse(gdb); goto out; } brelse(gdb); } /* Zero out all of the reserved backup group descriptor * table blocks */ if (ext4_bg_has_super(sb, group)) { err = sb_issue_zeroout(sb, gdblocks + start + 1, reserved_gdb, GFP_NOFS); if (err) goto out; } handle_itb: /* Initialize group tables of the group @group */ if (!(bg_flags[i] & EXT4_BG_INODE_ZEROED)) goto handle_bb; /* Zero out all of the inode table blocks */ block = group_data[i].inode_table; ext4_debug("clear inode table blocks %#04llx -> %#04lx\n", block, sbi->s_itb_per_group); err = sb_issue_zeroout(sb, block, sbi->s_itb_per_group, GFP_NOFS); if (err) goto out; handle_bb: if (bg_flags[i] & EXT4_BG_BLOCK_UNINIT) goto handle_ib; /* Initialize block bitmap of the @group */ block = group_data[i].block_bitmap; err = ext4_resize_ensure_credits_batch(handle, 1); if (err < 0) goto out; bh = bclean(handle, sb, block); if (IS_ERR(bh)) { err = PTR_ERR(bh); goto out; } overhead = ext4_group_overhead_blocks(sb, group); if (overhead != 0) { ext4_debug("mark backup superblock %#04llx (+0)\n", start); mb_set_bits(bh->b_data, 0, EXT4_NUM_B2C(sbi, overhead)); } ext4_mark_bitmap_end(EXT4_B2C(sbi, group_data[i].blocks_count), sb->s_blocksize * 8, bh->b_data); err = ext4_handle_dirty_metadata(handle, NULL, bh); brelse(bh); if (err) goto out; handle_ib: if (bg_flags[i] & EXT4_BG_INODE_UNINIT) continue; /* Initialize inode bitmap of the @group */ block = group_data[i].inode_bitmap; err = ext4_resize_ensure_credits_batch(handle, 1); if (err < 0) goto out; /* Mark unused entries in inode bitmap used */ bh = bclean(handle, sb, block); if (IS_ERR(bh)) { err = PTR_ERR(bh); goto out; } ext4_mark_bitmap_end(EXT4_INODES_PER_GROUP(sb), sb->s_blocksize * 8, bh->b_data); err = ext4_handle_dirty_metadata(handle, NULL, bh); brelse(bh); if (err) goto out; } /* Mark group tables in block bitmap */ for (j = 0; j < GROUP_TABLE_COUNT; j++) { count = group_table_count[j]; start = (&group_data[0].block_bitmap)[j]; block = start; for (i = 1; i < flex_gd->count; i++) { block += group_table_count[j]; if (block == (&group_data[i].block_bitmap)[j]) { count += group_table_count[j]; continue; } err = set_flexbg_block_bitmap(sb, handle, flex_gd, EXT4_B2C(sbi, start), EXT4_B2C(sbi, start + count - 1)); if (err) goto out; count = group_table_count[j]; start = (&group_data[i].block_bitmap)[j]; block = start; } err = set_flexbg_block_bitmap(sb, handle, flex_gd, EXT4_B2C(sbi, start), EXT4_B2C(sbi, start + count - 1)); if (err) goto out; } out: err2 = ext4_journal_stop(handle); if (err2 && !err) err = err2; return err; } /* * Iterate through the groups which hold BACKUP superblock/GDT copies in an * ext4 filesystem. The counters should be initialized to 1, 5, and 7 before * calling this for the first time. In a sparse filesystem it will be the * sequence of powers of 3, 5, and 7: 1, 3, 5, 7, 9, 25, 27, 49, 81, ... * For a non-sparse filesystem it will be every group: 1, 2, 3, 4, ... */ unsigned int ext4_list_backups(struct super_block *sb, unsigned int *three, unsigned int *five, unsigned int *seven) { struct ext4_super_block *es = EXT4_SB(sb)->s_es; unsigned int *min = three; int mult = 3; unsigned int ret; if (ext4_has_feature_sparse_super2(sb)) { do { if (*min > 2) return UINT_MAX; ret = le32_to_cpu(es->s_backup_bgs[*min - 1]); *min += 1; } while (!ret); return ret; } if (!ext4_has_feature_sparse_super(sb)) { ret = *min; *min += 1; return ret; } if (*five < *min) { min = five; mult = 5; } if (*seven < *min) { min = seven; mult = 7; } ret = *min; *min *= mult; return ret; } /* * Check that all of the backup GDT blocks are held in the primary GDT block. * It is assumed that they are stored in group order. Returns the number of * groups in current filesystem that have BACKUPS, or -ve error code. */ static int verify_reserved_gdb(struct super_block *sb, ext4_group_t end, struct buffer_head *primary) { const ext4_fsblk_t blk = primary->b_blocknr; unsigned three = 1; unsigned five = 5; unsigned seven = 7; unsigned grp; __le32 *p = (__le32 *)primary->b_data; int gdbackups = 0; while ((grp = ext4_list_backups(sb, &three, &five, &seven)) < end) { if (le32_to_cpu(*p++) != grp * EXT4_BLOCKS_PER_GROUP(sb) + blk){ ext4_warning(sb, "reserved GDT %llu" " missing grp %d (%llu)", blk, grp, grp * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + blk); return -EINVAL; } if (++gdbackups > EXT4_ADDR_PER_BLOCK(sb)) return -EFBIG; } return gdbackups; } /* * Called when we need to bring a reserved group descriptor table block into * use from the resize inode. The primary copy of the new GDT block currently * is an indirect block (under the double indirect block in the resize inode). * The new backup GDT blocks will be stored as leaf blocks in this indirect * block, in group order. Even though we know all the block numbers we need, * we check to ensure that the resize inode has actually reserved these blocks. * * Don't need to update the block bitmaps because the blocks are still in use. * * We get all of the error cases out of the way, so that we are sure to not * fail once we start modifying the data on disk, because JBD has no rollback. */ static int add_new_gdb(handle_t *handle, struct inode *inode, ext4_group_t group) { struct super_block *sb = inode->i_sb; struct ext4_super_block *es = EXT4_SB(sb)->s_es; unsigned long gdb_num = group / EXT4_DESC_PER_BLOCK(sb); ext4_fsblk_t gdblock = EXT4_SB(sb)->s_sbh->b_blocknr + 1 + gdb_num; struct buffer_head **o_group_desc, **n_group_desc = NULL; struct buffer_head *dind = NULL; struct buffer_head *gdb_bh = NULL; int gdbackups; struct ext4_iloc iloc = { .bh = NULL }; __le32 *data; int err; if (test_opt(sb, DEBUG)) printk(KERN_DEBUG "EXT4-fs: ext4_add_new_gdb: adding group block %lu\n", gdb_num); gdb_bh = ext4_sb_bread(sb, gdblock, 0); if (IS_ERR(gdb_bh)) return PTR_ERR(gdb_bh); gdbackups = verify_reserved_gdb(sb, group, gdb_bh); if (gdbackups < 0) { err = gdbackups; goto errout; } data = EXT4_I(inode)->i_data + EXT4_DIND_BLOCK; dind = ext4_sb_bread(sb, le32_to_cpu(*data), 0); if (IS_ERR(dind)) { err = PTR_ERR(dind); dind = NULL; goto errout; } data = (__le32 *)dind->b_data; if (le32_to_cpu(data[gdb_num % EXT4_ADDR_PER_BLOCK(sb)]) != gdblock) { ext4_warning(sb, "new group %u GDT block %llu not reserved", group, gdblock); err = -EINVAL; goto errout; } BUFFER_TRACE(EXT4_SB(sb)->s_sbh, "get_write_access"); err = ext4_journal_get_write_access(handle, sb, EXT4_SB(sb)->s_sbh, EXT4_JTR_NONE); if (unlikely(err)) goto errout; BUFFER_TRACE(gdb_bh, "get_write_access"); err = ext4_journal_get_write_access(handle, sb, gdb_bh, EXT4_JTR_NONE); if (unlikely(err)) goto errout; BUFFER_TRACE(dind, "get_write_access"); err = ext4_journal_get_write_access(handle, sb, dind, EXT4_JTR_NONE); if (unlikely(err)) { ext4_std_error(sb, err); goto errout; } /* ext4_reserve_inode_write() gets a reference on the iloc */ err = ext4_reserve_inode_write(handle, inode, &iloc); if (unlikely(err)) goto errout; n_group_desc = kvmalloc((gdb_num + 1) * sizeof(struct buffer_head *), GFP_KERNEL); if (!n_group_desc) { err = -ENOMEM; ext4_warning(sb, "not enough memory for %lu groups", gdb_num + 1); goto errout; } /* * Finally, we have all of the possible failures behind us... * * Remove new GDT block from inode double-indirect block and clear out * the new GDT block for use (which also "frees" the backup GDT blocks * from the reserved inode). We don't need to change the bitmaps for * these blocks, because they are marked as in-use from being in the * reserved inode, and will become GDT blocks (primary and backup). */ data[gdb_num % EXT4_ADDR_PER_BLOCK(sb)] = 0; err = ext4_handle_dirty_metadata(handle, NULL, dind); if (unlikely(err)) { ext4_std_error(sb, err); goto errout; } inode->i_blocks -= (gdbackups + 1) * sb->s_blocksize >> (9 - EXT4_SB(sb)->s_cluster_bits); ext4_mark_iloc_dirty(handle, inode, &iloc); memset(gdb_bh->b_data, 0, sb->s_blocksize); err = ext4_handle_dirty_metadata(handle, NULL, gdb_bh); if (unlikely(err)) { ext4_std_error(sb, err); iloc.bh = NULL; goto errout; } brelse(dind); rcu_read_lock(); o_group_desc = rcu_dereference(EXT4_SB(sb)->s_group_desc); memcpy(n_group_desc, o_group_desc, EXT4_SB(sb)->s_gdb_count * sizeof(struct buffer_head *)); rcu_read_unlock(); n_group_desc[gdb_num] = gdb_bh; rcu_assign_pointer(EXT4_SB(sb)->s_group_desc, n_group_desc); EXT4_SB(sb)->s_gdb_count++; ext4_kvfree_array_rcu(o_group_desc); lock_buffer(EXT4_SB(sb)->s_sbh); le16_add_cpu(&es->s_reserved_gdt_blocks, -1); ext4_superblock_csum_set(sb); unlock_buffer(EXT4_SB(sb)->s_sbh); err = ext4_handle_dirty_metadata(handle, NULL, EXT4_SB(sb)->s_sbh); if (err) ext4_std_error(sb, err); return err; errout: kvfree(n_group_desc); brelse(iloc.bh); brelse(dind); brelse(gdb_bh); ext4_debug("leaving with error %d\n", err); return err; } /* * If there is no available space in the existing block group descriptors for * the new block group and there are no reserved block group descriptors, then * the meta_bg feature will get enabled, and es->s_first_meta_bg will get set * to the first block group that is managed using meta_bg and s_first_meta_bg * must be a multiple of EXT4_DESC_PER_BLOCK(sb). * This function will be called when first group of meta_bg is added to bring * new group descriptors block of new added meta_bg. */ static int add_new_gdb_meta_bg(struct super_block *sb, handle_t *handle, ext4_group_t group) { ext4_fsblk_t gdblock; struct buffer_head *gdb_bh; struct buffer_head **o_group_desc, **n_group_desc; unsigned long gdb_num = group / EXT4_DESC_PER_BLOCK(sb); int err; gdblock = ext4_group_first_block_no(sb, group) + ext4_bg_has_super(sb, group); gdb_bh = ext4_sb_bread(sb, gdblock, 0); if (IS_ERR(gdb_bh)) return PTR_ERR(gdb_bh); n_group_desc = kvmalloc((gdb_num + 1) * sizeof(struct buffer_head *), GFP_KERNEL); if (!n_group_desc) { brelse(gdb_bh); err = -ENOMEM; ext4_warning(sb, "not enough memory for %lu groups", gdb_num + 1); return err; } rcu_read_lock(); o_group_desc = rcu_dereference(EXT4_SB(sb)->s_group_desc); memcpy(n_group_desc, o_group_desc, EXT4_SB(sb)->s_gdb_count * sizeof(struct buffer_head *)); rcu_read_unlock(); n_group_desc[gdb_num] = gdb_bh; BUFFER_TRACE(gdb_bh, "get_write_access"); err = ext4_journal_get_write_access(handle, sb, gdb_bh, EXT4_JTR_NONE); if (err) { kvfree(n_group_desc); brelse(gdb_bh); return err; } rcu_assign_pointer(EXT4_SB(sb)->s_group_desc, n_group_desc); EXT4_SB(sb)->s_gdb_count++; ext4_kvfree_array_rcu(o_group_desc); return err; } /* * Called when we are adding a new group which has a backup copy of each of * the GDT blocks (i.e. sparse group) and there are reserved GDT blocks. * We need to add these reserved backup GDT blocks to the resize inode, so * that they are kept for future resizing and not allocated to files. * * Each reserved backup GDT block will go into a different indirect block. * The indirect blocks are actually the primary reserved GDT blocks, * so we know in advance what their block numbers are. We only get the * double-indirect block to verify it is pointing to the primary reserved * GDT blocks so we don't overwrite a data block by accident. The reserved * backup GDT blocks are stored in their reserved primary GDT block. */ static int reserve_backup_gdb(handle_t *handle, struct inode *inode, ext4_group_t group) { struct super_block *sb = inode->i_sb; int reserved_gdb =le16_to_cpu(EXT4_SB(sb)->s_es->s_reserved_gdt_blocks); int cluster_bits = EXT4_SB(sb)->s_cluster_bits; struct buffer_head **primary; struct buffer_head *dind; struct ext4_iloc iloc; ext4_fsblk_t blk; __le32 *data, *end; int gdbackups = 0; int res, i; int err; primary = kmalloc_array(reserved_gdb, sizeof(*primary), GFP_NOFS); if (!primary) return -ENOMEM; data = EXT4_I(inode)->i_data + EXT4_DIND_BLOCK; dind = ext4_sb_bread(sb, le32_to_cpu(*data), 0); if (IS_ERR(dind)) { err = PTR_ERR(dind); dind = NULL; goto exit_free; } blk = EXT4_SB(sb)->s_sbh->b_blocknr + 1 + EXT4_SB(sb)->s_gdb_count; data = (__le32 *)dind->b_data + (EXT4_SB(sb)->s_gdb_count % EXT4_ADDR_PER_BLOCK(sb)); end = (__le32 *)dind->b_data + EXT4_ADDR_PER_BLOCK(sb); /* Get each reserved primary GDT block and verify it holds backups */ for (res = 0; res < reserved_gdb; res++, blk++) { if (le32_to_cpu(*data) != blk) { ext4_warning(sb, "reserved block %llu" " not at offset %ld", blk, (long)(data - (__le32 *)dind->b_data)); err = -EINVAL; goto exit_bh; } primary[res] = ext4_sb_bread(sb, blk, 0); if (IS_ERR(primary[res])) { err = PTR_ERR(primary[res]); primary[res] = NULL; goto exit_bh; } gdbackups = verify_reserved_gdb(sb, group, primary[res]); if (gdbackups < 0) { brelse(primary[res]); err = gdbackups; goto exit_bh; } if (++data >= end) data = (__le32 *)dind->b_data; } for (i = 0; i < reserved_gdb; i++) { BUFFER_TRACE(primary[i], "get_write_access"); if ((err = ext4_journal_get_write_access(handle, sb, primary[i], EXT4_JTR_NONE))) goto exit_bh; } if ((err = ext4_reserve_inode_write(handle, inode, &iloc))) goto exit_bh; /* * Finally we can add each of the reserved backup GDT blocks from * the new group to its reserved primary GDT block. */ blk = group * EXT4_BLOCKS_PER_GROUP(sb); for (i = 0; i < reserved_gdb; i++) { int err2; data = (__le32 *)primary[i]->b_data; data[gdbackups] = cpu_to_le32(blk + primary[i]->b_blocknr); err2 = ext4_handle_dirty_metadata(handle, NULL, primary[i]); if (!err) err = err2; } inode->i_blocks += reserved_gdb * sb->s_blocksize >> (9 - cluster_bits); ext4_mark_iloc_dirty(handle, inode, &iloc); exit_bh: while (--res >= 0) brelse(primary[res]); brelse(dind); exit_free: kfree(primary); return err; } static inline void ext4_set_block_group_nr(struct super_block *sb, char *data, ext4_group_t group) { struct ext4_super_block *es = (struct ext4_super_block *) data; es->s_block_group_nr = cpu_to_le16(group); if (ext4_has_metadata_csum(sb)) es->s_checksum = ext4_superblock_csum(sb, es); } /* * Update the backup copies of the ext4 metadata. These don't need to be part * of the main resize transaction, because e2fsck will re-write them if there * is a problem (basically only OOM will cause a problem). However, we * _should_ update the backups if possible, in case the primary gets trashed * for some reason and we need to run e2fsck from a backup superblock. The * important part is that the new block and inode counts are in the backup * superblocks, and the location of the new group metadata in the GDT backups. * * We do not need take the s_resize_lock for this, because these * blocks are not otherwise touched by the filesystem code when it is * mounted. We don't need to worry about last changing from * sbi->s_groups_count, because the worst that can happen is that we * do not copy the full number of backups at this time. The resize * which changed s_groups_count will backup again. */ static void update_backups(struct super_block *sb, sector_t blk_off, char *data, int size, int meta_bg) { struct ext4_sb_info *sbi = EXT4_SB(sb); ext4_group_t last; const int bpg = EXT4_BLOCKS_PER_GROUP(sb); unsigned three = 1; unsigned five = 5; unsigned seven = 7; ext4_group_t group = 0; int rest = sb->s_blocksize - size; handle_t *handle; int err = 0, err2; handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, EXT4_MAX_TRANS_DATA); if (IS_ERR(handle)) { group = 1; err = PTR_ERR(handle); goto exit_err; } if (meta_bg == 0) { group = ext4_list_backups(sb, &three, &five, &seven); last = sbi->s_groups_count; } else { group = ext4_get_group_number(sb, blk_off) + 1; last = (ext4_group_t)(group + EXT4_DESC_PER_BLOCK(sb) - 2); } while (group < sbi->s_groups_count) { struct buffer_head *bh; ext4_fsblk_t backup_block; int has_super = ext4_bg_has_super(sb, group); ext4_fsblk_t first_block = ext4_group_first_block_no(sb, group); /* Out of journal space, and can't get more - abort - so sad */ err = ext4_resize_ensure_credits_batch(handle, 1); if (err < 0) break; if (meta_bg == 0) backup_block = ((ext4_fsblk_t)group) * bpg + blk_off; else backup_block = first_block + has_super; bh = sb_getblk(sb, backup_block); if (unlikely(!bh)) { err = -ENOMEM; break; } ext4_debug("update metadata backup %llu(+%llu)\n", backup_block, backup_block - ext4_group_first_block_no(sb, group)); BUFFER_TRACE(bh, "get_write_access"); if ((err = ext4_journal_get_write_access(handle, sb, bh, EXT4_JTR_NONE))) { brelse(bh); break; } lock_buffer(bh); memcpy(bh->b_data, data, size); if (rest) memset(bh->b_data + size, 0, rest); if (has_super && (backup_block == first_block)) ext4_set_block_group_nr(sb, bh->b_data, group); set_buffer_uptodate(bh); unlock_buffer(bh); err = ext4_handle_dirty_metadata(handle, NULL, bh); if (unlikely(err)) ext4_std_error(sb, err); brelse(bh); if (meta_bg == 0) group = ext4_list_backups(sb, &three, &five, &seven); else if (group == last) break; else group = last; } if ((err2 = ext4_journal_stop(handle)) && !err) err = err2; /* * Ugh! Need to have e2fsck write the backup copies. It is too * late to revert the resize, we shouldn't fail just because of * the backup copies (they are only needed in case of corruption). * * However, if we got here we have a journal problem too, so we * can't really start a transaction to mark the superblock. * Chicken out and just set the flag on the hope it will be written * to disk, and if not - we will simply wait until next fsck. */ exit_err: if (err) { ext4_warning(sb, "can't update backup for group %u (err %d), " "forcing fsck on next reboot", group, err); sbi->s_mount_state &= ~EXT4_VALID_FS; sbi->s_es->s_state &= cpu_to_le16(~EXT4_VALID_FS); mark_buffer_dirty(sbi->s_sbh); } } /* * ext4_add_new_descs() adds @count group descriptor of groups * starting at @group * * @handle: journal handle * @sb: super block * @group: the group no. of the first group desc to be added * @resize_inode: the resize inode * @count: number of group descriptors to be added */ static int ext4_add_new_descs(handle_t *handle, struct super_block *sb, ext4_group_t group, struct inode *resize_inode, ext4_group_t count) { struct ext4_sb_info *sbi = EXT4_SB(sb); struct ext4_super_block *es = sbi->s_es; struct buffer_head *gdb_bh; int i, gdb_off, gdb_num, err = 0; int meta_bg; meta_bg = ext4_has_feature_meta_bg(sb); for (i = 0; i < count; i++, group++) { int reserved_gdb = ext4_bg_has_super(sb, group) ? le16_to_cpu(es->s_reserved_gdt_blocks) : 0; gdb_off = group % EXT4_DESC_PER_BLOCK(sb); gdb_num = group / EXT4_DESC_PER_BLOCK(sb); /* * We will only either add reserved group blocks to a backup group * or remove reserved blocks for the first group in a new group block. * Doing both would be mean more complex code, and sane people don't * use non-sparse filesystems anymore. This is already checked above. */ if (gdb_off) { gdb_bh = sbi_array_rcu_deref(sbi, s_group_desc, gdb_num); BUFFER_TRACE(gdb_bh, "get_write_access"); err = ext4_journal_get_write_access(handle, sb, gdb_bh, EXT4_JTR_NONE); if (!err && reserved_gdb && ext4_bg_num_gdb(sb, group)) err = reserve_backup_gdb(handle, resize_inode, group); } else if (meta_bg != 0) { err = add_new_gdb_meta_bg(sb, handle, group); } else { err = add_new_gdb(handle, resize_inode, group); } if (err) break; } return err; } static struct buffer_head *ext4_get_bitmap(struct super_block *sb, __u64 block) { struct buffer_head *bh = sb_getblk(sb, block); if (unlikely(!bh)) return NULL; if (!bh_uptodate_or_lock(bh)) { if (ext4_read_bh(bh, 0, NULL) < 0) { brelse(bh); return NULL; } } return bh; } static int ext4_set_bitmap_checksums(struct super_block *sb, struct ext4_group_desc *gdp, struct ext4_new_group_data *group_data) { struct buffer_head *bh; if (!ext4_has_metadata_csum(sb)) return 0; bh = ext4_get_bitmap(sb, group_data->inode_bitmap); if (!bh) return -EIO; ext4_inode_bitmap_csum_set(sb, gdp, bh, EXT4_INODES_PER_GROUP(sb) / 8); brelse(bh); bh = ext4_get_bitmap(sb, group_data->block_bitmap); if (!bh) return -EIO; ext4_block_bitmap_csum_set(sb, gdp, bh); brelse(bh); return 0; } /* * ext4_setup_new_descs() will set up the group descriptor descriptors of a flex bg */ static int ext4_setup_new_descs(handle_t *handle, struct super_block *sb, struct ext4_new_flex_group_data *flex_gd) { struct ext4_new_group_data *group_data = flex_gd->groups; struct ext4_group_desc *gdp; struct ext4_sb_info *sbi = EXT4_SB(sb); struct buffer_head *gdb_bh; ext4_group_t group; __u16 *bg_flags = flex_gd->bg_flags; int i, gdb_off, gdb_num, err = 0; for (i = 0; i < flex_gd->count; i++, group_data++, bg_flags++) { group = group_data->group; gdb_off = group % EXT4_DESC_PER_BLOCK(sb); gdb_num = group / EXT4_DESC_PER_BLOCK(sb); /* * get_write_access() has been called on gdb_bh by ext4_add_new_desc(). */ gdb_bh = sbi_array_rcu_deref(sbi, s_group_desc, gdb_num); /* Update group descriptor block for new group */ gdp = (struct ext4_group_desc *)(gdb_bh->b_data + gdb_off * EXT4_DESC_SIZE(sb)); memset(gdp, 0, EXT4_DESC_SIZE(sb)); ext4_block_bitmap_set(sb, gdp, group_data->block_bitmap); ext4_inode_bitmap_set(sb, gdp, group_data->inode_bitmap); err = ext4_set_bitmap_checksums(sb, gdp, group_data); if (err) { ext4_std_error(sb, err); break; } ext4_inode_table_set(sb, gdp, group_data->inode_table); ext4_free_group_clusters_set(sb, gdp, group_data->free_clusters_count); ext4_free_inodes_set(sb, gdp, EXT4_INODES_PER_GROUP(sb)); if (ext4_has_group_desc_csum(sb)) ext4_itable_unused_set(sb, gdp, EXT4_INODES_PER_GROUP(sb)); gdp->bg_flags = cpu_to_le16(*bg_flags); ext4_group_desc_csum_set(sb, group, gdp); err = ext4_handle_dirty_metadata(handle, NULL, gdb_bh); if (unlikely(err)) { ext4_std_error(sb, err); break; } /* * We can allocate memory for mb_alloc based on the new group * descriptor */ err = ext4_mb_add_groupinfo(sb, group, gdp); if (err) break; } return err; } static void ext4_add_overhead(struct super_block *sb, const ext4_fsblk_t overhead) { struct ext4_sb_info *sbi = EXT4_SB(sb); struct ext4_super_block *es = sbi->s_es; sbi->s_overhead += overhead; es->s_overhead_clusters = cpu_to_le32(sbi->s_overhead); smp_wmb(); } /* * ext4_update_super() updates the super block so that the newly added * groups can be seen by the filesystem. * * @sb: super block * @flex_gd: new added groups */ static void ext4_update_super(struct super_block *sb, struct ext4_new_flex_group_data *flex_gd) { ext4_fsblk_t blocks_count = 0; ext4_fsblk_t free_blocks = 0; ext4_fsblk_t reserved_blocks = 0; struct ext4_new_group_data *group_data = flex_gd->groups; struct ext4_sb_info *sbi = EXT4_SB(sb); struct ext4_super_block *es = sbi->s_es; int i; BUG_ON(flex_gd->count == 0 || group_data == NULL); /* * Make the new blocks and inodes valid next. We do this before * increasing the group count so that once the group is enabled, * all of its blocks and inodes are already valid. * * We always allocate group-by-group, then block-by-block or * inode-by-inode within a group, so enabling these * blocks/inodes before the group is live won't actually let us * allocate the new space yet. */ for (i = 0; i < flex_gd->count; i++) { blocks_count += group_data[i].blocks_count; free_blocks += EXT4_C2B(sbi, group_data[i].free_clusters_count); } reserved_blocks = ext4_r_blocks_count(es) * 100; reserved_blocks = div64_u64(reserved_blocks, ext4_blocks_count(es)); reserved_blocks *= blocks_count; do_div(reserved_blocks, 100); lock_buffer(sbi->s_sbh); ext4_blocks_count_set(es, ext4_blocks_count(es) + blocks_count); ext4_free_blocks_count_set(es, ext4_free_blocks_count(es) + free_blocks); le32_add_cpu(&es->s_inodes_count, EXT4_INODES_PER_GROUP(sb) * flex_gd->count); le32_add_cpu(&es->s_free_inodes_count, EXT4_INODES_PER_GROUP(sb) * flex_gd->count); ext4_debug("free blocks count %llu", ext4_free_blocks_count(es)); /* * We need to protect s_groups_count against other CPUs seeing * inconsistent state in the superblock. * * The precise rules we use are: * * * Writers must perform a smp_wmb() after updating all * dependent data and before modifying the groups count * * * Readers must perform an smp_rmb() after reading the groups * count and before reading any dependent data. * * NB. These rules can be relaxed when checking the group count * while freeing data, as we can only allocate from a block * group after serialising against the group count, and we can * only then free after serialising in turn against that * allocation. */ smp_wmb(); /* Update the global fs size fields */ sbi->s_groups_count += flex_gd->count; sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count, (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb))); /* Update the reserved block counts only once the new group is * active. */ ext4_r_blocks_count_set(es, ext4_r_blocks_count(es) + reserved_blocks); /* Update the free space counts */ percpu_counter_add(&sbi->s_freeclusters_counter, EXT4_NUM_B2C(sbi, free_blocks)); percpu_counter_add(&sbi->s_freeinodes_counter, EXT4_INODES_PER_GROUP(sb) * flex_gd->count); ext4_debug("free blocks count %llu", percpu_counter_read(&sbi->s_freeclusters_counter)); if (ext4_has_feature_flex_bg(sb) && sbi->s_log_groups_per_flex) { ext4_group_t flex_group; struct flex_groups *fg; flex_group = ext4_flex_group(sbi, group_data[0].group); fg = sbi_array_rcu_deref(sbi, s_flex_groups, flex_group); atomic64_add(EXT4_NUM_B2C(sbi, free_blocks), &fg->free_clusters); atomic_add(EXT4_INODES_PER_GROUP(sb) * flex_gd->count, &fg->free_inodes); } /* * Update the fs overhead information. * * For bigalloc, if the superblock already has a properly calculated * overhead, update it with a value based on numbers already computed * above for the newly allocated capacity. */ if (ext4_has_feature_bigalloc(sb) && (sbi->s_overhead != 0)) ext4_add_overhead(sb, EXT4_NUM_B2C(sbi, blocks_count - free_blocks)); else ext4_calculate_overhead(sb); es->s_overhead_clusters = cpu_to_le32(sbi->s_overhead); ext4_superblock_csum_set(sb); unlock_buffer(sbi->s_sbh); if (test_opt(sb, DEBUG)) printk(KERN_DEBUG "EXT4-fs: added group %u:" "%llu blocks(%llu free %llu reserved)\n", flex_gd->count, blocks_count, free_blocks, reserved_blocks); } /* Add a flex group to an fs. Ensure we handle all possible error conditions * _before_ we start modifying the filesystem, because we cannot abort the * transaction and not have it write the data to disk. */ static int ext4_flex_group_add(struct super_block *sb, struct inode *resize_inode, struct ext4_new_flex_group_data *flex_gd) { struct ext4_sb_info *sbi = EXT4_SB(sb); struct ext4_super_block *es = sbi->s_es; ext4_fsblk_t o_blocks_count; ext4_grpblk_t last; ext4_group_t group; handle_t *handle; unsigned reserved_gdb; int err = 0, err2 = 0, credit; BUG_ON(!flex_gd->count || !flex_gd->groups || !flex_gd->bg_flags); reserved_gdb = le16_to_cpu(es->s_reserved_gdt_blocks); o_blocks_count = ext4_blocks_count(es); ext4_get_group_no_and_offset(sb, o_blocks_count, &group, &last); BUG_ON(last); err = setup_new_flex_group_blocks(sb, flex_gd); if (err) goto exit; /* * We will always be modifying at least the superblock and GDT * blocks. If we are adding a group past the last current GDT block, * we will also modify the inode and the dindirect block. If we * are adding a group with superblock/GDT backups we will also * modify each of the reserved GDT dindirect blocks. */ credit = 3; /* sb, resize inode, resize inode dindirect */ /* GDT blocks */ credit += 1 + DIV_ROUND_UP(flex_gd->count, EXT4_DESC_PER_BLOCK(sb)); credit += reserved_gdb; /* Reserved GDT dindirect blocks */ handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, credit); if (IS_ERR(handle)) { err = PTR_ERR(handle); goto exit; } BUFFER_TRACE(sbi->s_sbh, "get_write_access"); err = ext4_journal_get_write_access(handle, sb, sbi->s_sbh, EXT4_JTR_NONE); if (err) goto exit_journal; group = flex_gd->groups[0].group; BUG_ON(group != sbi->s_groups_count); err = ext4_add_new_descs(handle, sb, group, resize_inode, flex_gd->count); if (err) goto exit_journal; err = ext4_setup_new_descs(handle, sb, flex_gd); if (err) goto exit_journal; ext4_update_super(sb, flex_gd); err = ext4_handle_dirty_metadata(handle, NULL, sbi->s_sbh); exit_journal: err2 = ext4_journal_stop(handle); if (!err) err = err2; if (!err) { int gdb_num = group / EXT4_DESC_PER_BLOCK(sb); int gdb_num_end = ((group + flex_gd->count - 1) / EXT4_DESC_PER_BLOCK(sb)); int meta_bg = ext4_has_feature_meta_bg(sb) && gdb_num >= le32_to_cpu(es->s_first_meta_bg); sector_t padding_blocks = meta_bg ? 0 : sbi->s_sbh->b_blocknr - ext4_group_first_block_no(sb, 0); update_backups(sb, ext4_group_first_block_no(sb, 0), (char *)es, sizeof(struct ext4_super_block), 0); for (; gdb_num <= gdb_num_end; gdb_num++) { struct buffer_head *gdb_bh; gdb_bh = sbi_array_rcu_deref(sbi, s_group_desc, gdb_num); update_backups(sb, gdb_bh->b_blocknr - padding_blocks, gdb_bh->b_data, gdb_bh->b_size, meta_bg); } } exit: return err; } static int ext4_setup_next_flex_gd(struct super_block *sb, struct ext4_new_flex_group_data *flex_gd, ext4_fsblk_t n_blocks_count) { struct ext4_sb_info *sbi = EXT4_SB(sb); struct ext4_super_block *es = sbi->s_es; struct ext4_new_group_data *group_data = flex_gd->groups; ext4_fsblk_t o_blocks_count; ext4_group_t n_group; ext4_group_t group; ext4_group_t last_group; ext4_grpblk_t last; ext4_grpblk_t clusters_per_group; unsigned long i; clusters_per_group = EXT4_CLUSTERS_PER_GROUP(sb); o_blocks_count = ext4_blocks_count(es); if (o_blocks_count == n_blocks_count) return 0; ext4_get_group_no_and_offset(sb, o_blocks_count, &group, &last); BUG_ON(last); ext4_get_group_no_and_offset(sb, n_blocks_count - 1, &n_group, &last); last_group = group | (flex_gd->resize_bg - 1); if (last_group > n_group) last_group = n_group; flex_gd->count = last_group - group + 1; for (i = 0; i < flex_gd->count; i++) { int overhead; group_data[i].group = group + i; group_data[i].blocks_count = EXT4_BLOCKS_PER_GROUP(sb); overhead = ext4_group_overhead_blocks(sb, group + i); group_data[i].mdata_blocks = overhead; group_data[i].free_clusters_count = EXT4_CLUSTERS_PER_GROUP(sb); if (ext4_has_group_desc_csum(sb)) { flex_gd->bg_flags[i] = EXT4_BG_BLOCK_UNINIT | EXT4_BG_INODE_UNINIT; if (!test_opt(sb, INIT_INODE_TABLE)) flex_gd->bg_flags[i] |= EXT4_BG_INODE_ZEROED; } else flex_gd->bg_flags[i] = EXT4_BG_INODE_ZEROED; } if (last_group == n_group && ext4_has_group_desc_csum(sb)) /* We need to initialize block bitmap of last group. */ flex_gd->bg_flags[i - 1] &= ~EXT4_BG_BLOCK_UNINIT; if ((last_group == n_group) && (last != clusters_per_group - 1)) { group_data[i - 1].blocks_count = EXT4_C2B(sbi, last + 1); group_data[i - 1].free_clusters_count -= clusters_per_group - last - 1; } return 1; } /* Add group descriptor data to an existing or new group descriptor block. * Ensure we handle all possible error conditions _before_ we start modifying * the filesystem, because we cannot abort the transaction and not have it * write the data to disk. * * If we are on a GDT block boundary, we need to get the reserved GDT block. * Otherwise, we may need to add backup GDT blocks for a sparse group. * * We only need to hold the superblock lock while we are actually adding * in the new group's counts to the superblock. Prior to that we have * not really "added" the group at all. We re-check that we are still * adding in the last group in case things have changed since verifying. */ int ext4_group_add(struct super_block *sb, struct ext4_new_group_data *input) { struct ext4_new_flex_group_data flex_gd; struct ext4_sb_info *sbi = EXT4_SB(sb); struct ext4_super_block *es = sbi->s_es; int reserved_gdb = ext4_bg_has_super(sb, input->group) ? le16_to_cpu(es->s_reserved_gdt_blocks) : 0; struct inode *inode = NULL; int gdb_off; int err; __u16 bg_flags = 0; gdb_off = input->group % EXT4_DESC_PER_BLOCK(sb); if (gdb_off == 0 && !ext4_has_feature_sparse_super(sb)) { ext4_warning(sb, "Can't resize non-sparse filesystem further"); return -EPERM; } if (ext4_blocks_count(es) + input->blocks_count < ext4_blocks_count(es)) { ext4_warning(sb, "blocks_count overflow"); return -EINVAL; } if (le32_to_cpu(es->s_inodes_count) + EXT4_INODES_PER_GROUP(sb) < le32_to_cpu(es->s_inodes_count)) { ext4_warning(sb, "inodes_count overflow"); return -EINVAL; } if (reserved_gdb || gdb_off == 0) { if (!ext4_has_feature_resize_inode(sb) || !le16_to_cpu(es->s_reserved_gdt_blocks)) { ext4_warning(sb, "No reserved GDT blocks, can't resize"); return -EPERM; } inode = ext4_iget(sb, EXT4_RESIZE_INO, EXT4_IGET_SPECIAL); if (IS_ERR(inode)) { ext4_warning(sb, "Error opening resize inode"); return PTR_ERR(inode); } } err = verify_group_input(sb, input); if (err) goto out; err = ext4_alloc_flex_bg_array(sb, input->group + 1); if (err) goto out; err = ext4_mb_alloc_groupinfo(sb, input->group + 1); if (err) goto out; flex_gd.count = 1; flex_gd.groups = input; flex_gd.bg_flags = &bg_flags; err = ext4_flex_group_add(sb, inode, &flex_gd); out: iput(inode); return err; } /* ext4_group_add */ /* * extend a group without checking assuming that checking has been done. */ static int ext4_group_extend_no_check(struct super_block *sb, ext4_fsblk_t o_blocks_count, ext4_grpblk_t add) { struct ext4_super_block *es = EXT4_SB(sb)->s_es; handle_t *handle; int err = 0, err2; /* We will update the superblock, one block bitmap, and * one group descriptor via ext4_group_add_blocks(). */ handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, 3); if (IS_ERR(handle)) { err = PTR_ERR(handle); ext4_warning(sb, "error %d on journal start", err); return err; } BUFFER_TRACE(EXT4_SB(sb)->s_sbh, "get_write_access"); err = ext4_journal_get_write_access(handle, sb, EXT4_SB(sb)->s_sbh, EXT4_JTR_NONE); if (err) { ext4_warning(sb, "error %d on journal write access", err); goto errout; } lock_buffer(EXT4_SB(sb)->s_sbh); ext4_blocks_count_set(es, o_blocks_count + add); ext4_free_blocks_count_set(es, ext4_free_blocks_count(es) + add); ext4_superblock_csum_set(sb); unlock_buffer(EXT4_SB(sb)->s_sbh); ext4_debug("freeing blocks %llu through %llu\n", o_blocks_count, o_blocks_count + add); /* We add the blocks to the bitmap and set the group need init bit */ err = ext4_group_add_blocks(handle, sb, o_blocks_count, add); if (err) goto errout; ext4_handle_dirty_metadata(handle, NULL, EXT4_SB(sb)->s_sbh); ext4_debug("freed blocks %llu through %llu\n", o_blocks_count, o_blocks_count + add); errout: err2 = ext4_journal_stop(handle); if (err2 && !err) err = err2; if (!err) { if (test_opt(sb, DEBUG)) printk(KERN_DEBUG "EXT4-fs: extended group to %llu " "blocks\n", ext4_blocks_count(es)); update_backups(sb, ext4_group_first_block_no(sb, 0), (char *)es, sizeof(struct ext4_super_block), 0); } return err; } /* * Extend the filesystem to the new number of blocks specified. This entry * point is only used to extend the current filesystem to the end of the last * existing group. It can be accessed via ioctl, or by "remount,resize=<size>" * for emergencies (because it has no dependencies on reserved blocks). * * If we _really_ wanted, we could use default values to call ext4_group_add() * allow the "remount" trick to work for arbitrary resizing, assuming enough * GDT blocks are reserved to grow to the desired size. */ int ext4_group_extend(struct super_block *sb, struct ext4_super_block *es, ext4_fsblk_t n_blocks_count) { ext4_fsblk_t o_blocks_count; ext4_grpblk_t last; ext4_grpblk_t add; struct buffer_head *bh; ext4_group_t group; o_blocks_count = ext4_blocks_count(es); if (test_opt(sb, DEBUG)) ext4_msg(sb, KERN_DEBUG, "extending last group from %llu to %llu blocks", o_blocks_count, n_blocks_count); if (n_blocks_count == 0 || n_blocks_count == o_blocks_count) return 0; if (n_blocks_count > (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) { ext4_msg(sb, KERN_ERR, "filesystem too large to resize to %llu blocks safely", n_blocks_count); return -EINVAL; } if (n_blocks_count < o_blocks_count) { ext4_warning(sb, "can't shrink FS - resize aborted"); return -EINVAL; } /* Handle the remaining blocks in the last group only. */ ext4_get_group_no_and_offset(sb, o_blocks_count, &group, &last); if (last == 0) { ext4_warning(sb, "need to use ext2online to resize further"); return -EPERM; } add = EXT4_BLOCKS_PER_GROUP(sb) - last; if (o_blocks_count + add < o_blocks_count) { ext4_warning(sb, "blocks_count overflow"); return -EINVAL; } if (o_blocks_count + add > n_blocks_count) add = n_blocks_count - o_blocks_count; if (o_blocks_count + add < n_blocks_count) ext4_warning(sb, "will only finish group (%llu blocks, %u new)", o_blocks_count + add, add); /* See if the device is actually as big as what was requested */ bh = ext4_sb_bread(sb, o_blocks_count + add - 1, 0); if (IS_ERR(bh)) { ext4_warning(sb, "can't read last block, resize aborted"); return -ENOSPC; } brelse(bh); return ext4_group_extend_no_check(sb, o_blocks_count, add); } /* ext4_group_extend */ static int num_desc_blocks(struct super_block *sb, ext4_group_t groups) { return (groups + EXT4_DESC_PER_BLOCK(sb) - 1) / EXT4_DESC_PER_BLOCK(sb); } /* * Release the resize inode and drop the resize_inode feature if there * are no more reserved gdt blocks, and then convert the file system * to enable meta_bg */ static int ext4_convert_meta_bg(struct super_block *sb, struct inode *inode) { handle_t *handle; struct ext4_sb_info *sbi = EXT4_SB(sb); struct ext4_super_block *es = sbi->s_es; struct ext4_inode_info *ei = EXT4_I(inode); ext4_fsblk_t nr; int i, ret, err = 0; int credits = 1; ext4_msg(sb, KERN_INFO, "Converting file system to meta_bg"); if (inode) { if (es->s_reserved_gdt_blocks) { ext4_error(sb, "Unexpected non-zero " "s_reserved_gdt_blocks"); return -EPERM; } /* Do a quick sanity check of the resize inode */ if (inode->i_blocks != 1 << (inode->i_blkbits - (9 - sbi->s_cluster_bits))) goto invalid_resize_inode; for (i = 0; i < EXT4_N_BLOCKS; i++) { if (i == EXT4_DIND_BLOCK) { if (ei->i_data[i]) continue; else goto invalid_resize_inode; } if (ei->i_data[i]) goto invalid_resize_inode; } credits += 3; /* block bitmap, bg descriptor, resize inode */ } handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, credits); if (IS_ERR(handle)) return PTR_ERR(handle); BUFFER_TRACE(sbi->s_sbh, "get_write_access"); err = ext4_journal_get_write_access(handle, sb, sbi->s_sbh, EXT4_JTR_NONE); if (err) goto errout; lock_buffer(sbi->s_sbh); ext4_clear_feature_resize_inode(sb); ext4_set_feature_meta_bg(sb); sbi->s_es->s_first_meta_bg = cpu_to_le32(num_desc_blocks(sb, sbi->s_groups_count)); ext4_superblock_csum_set(sb); unlock_buffer(sbi->s_sbh); err = ext4_handle_dirty_metadata(handle, NULL, sbi->s_sbh); if (err) { ext4_std_error(sb, err); goto errout; } if (inode) { nr = le32_to_cpu(ei->i_data[EXT4_DIND_BLOCK]); ext4_free_blocks(handle, inode, NULL, nr, 1, EXT4_FREE_BLOCKS_METADATA | EXT4_FREE_BLOCKS_FORGET); ei->i_data[EXT4_DIND_BLOCK] = 0; inode->i_blocks = 0; err = ext4_mark_inode_dirty(handle, inode); if (err) ext4_std_error(sb, err); } errout: ret = ext4_journal_stop(handle); return err ? err : ret; invalid_resize_inode: ext4_error(sb, "corrupted/inconsistent resize inode"); return -EINVAL; } /* * ext4_resize_fs() resizes a fs to new size specified by @n_blocks_count * * @sb: super block of the fs to be resized * @n_blocks_count: the number of blocks resides in the resized fs */ int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count) { struct ext4_new_flex_group_data *flex_gd = NULL; struct ext4_sb_info *sbi = EXT4_SB(sb); struct ext4_super_block *es = sbi->s_es; struct buffer_head *bh; struct inode *resize_inode = NULL; ext4_grpblk_t add, offset; unsigned long n_desc_blocks; unsigned long o_desc_blocks; ext4_group_t o_group; ext4_group_t n_group; ext4_fsblk_t o_blocks_count; ext4_fsblk_t n_blocks_count_retry = 0; unsigned long last_update_time = 0; int err = 0; int meta_bg; unsigned int flexbg_size = ext4_flex_bg_size(sbi); /* See if the device is actually as big as what was requested */ bh = ext4_sb_bread(sb, n_blocks_count - 1, 0); if (IS_ERR(bh)) { ext4_warning(sb, "can't read last block, resize aborted"); return -ENOSPC; } brelse(bh); /* * For bigalloc, trim the requested size to the nearest cluster * boundary to avoid creating an unusable filesystem. We do this * silently, instead of returning an error, to avoid breaking * callers that blindly resize the filesystem to the full size of * the underlying block device. */ if (ext4_has_feature_bigalloc(sb)) n_blocks_count &= ~((1 << EXT4_CLUSTER_BITS(sb)) - 1); retry: o_blocks_count = ext4_blocks_count(es); ext4_msg(sb, KERN_INFO, "resizing filesystem from %llu " "to %llu blocks", o_blocks_count, n_blocks_count); if (n_blocks_count < o_blocks_count) { /* On-line shrinking not supported */ ext4_warning(sb, "can't shrink FS - resize aborted"); return -EINVAL; } if (n_blocks_count == o_blocks_count) /* Nothing need to do */ return 0; n_group = ext4_get_group_number(sb, n_blocks_count - 1); if (n_group >= (0xFFFFFFFFUL / EXT4_INODES_PER_GROUP(sb))) { ext4_warning(sb, "resize would cause inodes_count overflow"); return -EINVAL; } ext4_get_group_no_and_offset(sb, o_blocks_count - 1, &o_group, &offset); n_desc_blocks = num_desc_blocks(sb, n_group + 1); o_desc_blocks = num_desc_blocks(sb, sbi->s_groups_count); meta_bg = ext4_has_feature_meta_bg(sb); if (ext4_has_feature_resize_inode(sb)) { if (meta_bg) { ext4_error(sb, "resize_inode and meta_bg enabled " "simultaneously"); return -EINVAL; } if (n_desc_blocks > o_desc_blocks + le16_to_cpu(es->s_reserved_gdt_blocks)) { n_blocks_count_retry = n_blocks_count; n_desc_blocks = o_desc_blocks + le16_to_cpu(es->s_reserved_gdt_blocks); n_group = n_desc_blocks * EXT4_DESC_PER_BLOCK(sb); n_blocks_count = (ext4_fsblk_t)n_group * EXT4_BLOCKS_PER_GROUP(sb) + le32_to_cpu(es->s_first_data_block); n_group--; /* set to last group number */ } if (!resize_inode) resize_inode = ext4_iget(sb, EXT4_RESIZE_INO, EXT4_IGET_SPECIAL); if (IS_ERR(resize_inode)) { ext4_warning(sb, "Error opening resize inode"); return PTR_ERR(resize_inode); } } if ((!resize_inode && !meta_bg && n_desc_blocks > o_desc_blocks) || n_blocks_count == o_blocks_count) { err = ext4_convert_meta_bg(sb, resize_inode); if (err) goto out; if (resize_inode) { iput(resize_inode); resize_inode = NULL; } if (n_blocks_count_retry) { n_blocks_count = n_blocks_count_retry; n_blocks_count_retry = 0; goto retry; } } /* * Make sure the last group has enough space so that it's * guaranteed to have enough space for all metadata blocks * that it might need to hold. (We might not need to store * the inode table blocks in the last block group, but there * will be cases where this might be needed.) */ if ((ext4_group_first_block_no(sb, n_group) + ext4_group_overhead_blocks(sb, n_group) + 2 + sbi->s_itb_per_group + sbi->s_cluster_ratio) >= n_blocks_count) { n_blocks_count = ext4_group_first_block_no(sb, n_group); n_group--; n_blocks_count_retry = 0; if (resize_inode) { iput(resize_inode); resize_inode = NULL; } goto retry; } /* extend the last group */ if (n_group == o_group) add = n_blocks_count - o_blocks_count; else add = EXT4_C2B(sbi, EXT4_CLUSTERS_PER_GROUP(sb) - (offset + 1)); if (add > 0) { err = ext4_group_extend_no_check(sb, o_blocks_count, add); if (err) goto out; } if (ext4_blocks_count(es) == n_blocks_count && n_blocks_count_retry == 0) goto out; err = ext4_alloc_flex_bg_array(sb, n_group + 1); if (err) goto out; err = ext4_mb_alloc_groupinfo(sb, n_group + 1); if (err) goto out; flex_gd = alloc_flex_gd(flexbg_size, o_group, n_group); if (flex_gd == NULL) { err = -ENOMEM; goto out; } /* Add flex groups. Note that a regular group is a * flex group with 1 group. */ while (ext4_setup_next_flex_gd(sb, flex_gd, n_blocks_count)) { if (time_is_before_jiffies(last_update_time + HZ * 10)) { if (last_update_time) ext4_msg(sb, KERN_INFO, "resized to %llu blocks", ext4_blocks_count(es)); last_update_time = jiffies; } if (ext4_alloc_group_tables(sb, flex_gd, flexbg_size) != 0) break; err = ext4_flex_group_add(sb, resize_inode, flex_gd); if (unlikely(err)) break; } if (!err && n_blocks_count_retry) { n_blocks_count = n_blocks_count_retry; n_blocks_count_retry = 0; free_flex_gd(flex_gd); flex_gd = NULL; if (resize_inode) { iput(resize_inode); resize_inode = NULL; } goto retry; } out: if (flex_gd) free_flex_gd(flex_gd); if (resize_inode != NULL) iput(resize_inode); if (err) ext4_warning(sb, "error (%d) occurred during " "file system resize", err); ext4_msg(sb, KERN_INFO, "resized filesystem to %llu", ext4_blocks_count(es)); return err; }
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