diff options
Diffstat (limited to 'ANDROID_3.4.5/fs/ocfs2/move_extents.c')
| -rw-r--r-- | ANDROID_3.4.5/fs/ocfs2/move_extents.c | 1151 |
1 files changed, 0 insertions, 1151 deletions
diff --git a/ANDROID_3.4.5/fs/ocfs2/move_extents.c b/ANDROID_3.4.5/fs/ocfs2/move_extents.c deleted file mode 100644 index b1e3fce7..00000000 --- a/ANDROID_3.4.5/fs/ocfs2/move_extents.c +++ /dev/null @@ -1,1151 +0,0 @@ -/* -*- mode: c; c-basic-offset: 8; -*- - * vim: noexpandtab sw=8 ts=8 sts=0: - * - * move_extents.c - * - * Copyright (C) 2011 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 version 2 as published by the Free Software Foundation. - * - * 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. - */ -#include <linux/fs.h> -#include <linux/types.h> -#include <linux/mount.h> -#include <linux/swap.h> - -#include <cluster/masklog.h> - -#include "ocfs2.h" -#include "ocfs2_ioctl.h" - -#include "alloc.h" -#include "aops.h" -#include "dlmglue.h" -#include "extent_map.h" -#include "inode.h" -#include "journal.h" -#include "suballoc.h" -#include "uptodate.h" -#include "super.h" -#include "dir.h" -#include "buffer_head_io.h" -#include "sysfile.h" -#include "refcounttree.h" -#include "move_extents.h" - -struct ocfs2_move_extents_context { - struct inode *inode; - struct file *file; - int auto_defrag; - int partial; - int credits; - u32 new_phys_cpos; - u32 clusters_moved; - u64 refcount_loc; - struct ocfs2_move_extents *range; - struct ocfs2_extent_tree et; - struct ocfs2_alloc_context *meta_ac; - struct ocfs2_alloc_context *data_ac; - struct ocfs2_cached_dealloc_ctxt dealloc; -}; - -static int __ocfs2_move_extent(handle_t *handle, - struct ocfs2_move_extents_context *context, - u32 cpos, u32 len, u32 p_cpos, u32 new_p_cpos, - int ext_flags) -{ - int ret = 0, index; - struct inode *inode = context->inode; - struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); - struct ocfs2_extent_rec *rec, replace_rec; - struct ocfs2_path *path = NULL; - struct ocfs2_extent_list *el; - u64 ino = ocfs2_metadata_cache_owner(context->et.et_ci); - u64 old_blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cpos); - - ret = ocfs2_duplicate_clusters_by_page(handle, context->file, cpos, - p_cpos, new_p_cpos, len); - if (ret) { - mlog_errno(ret); - goto out; - } - - memset(&replace_rec, 0, sizeof(replace_rec)); - replace_rec.e_cpos = cpu_to_le32(cpos); - replace_rec.e_leaf_clusters = cpu_to_le16(len); - replace_rec.e_blkno = cpu_to_le64(ocfs2_clusters_to_blocks(inode->i_sb, - new_p_cpos)); - - path = ocfs2_new_path_from_et(&context->et); - if (!path) { - ret = -ENOMEM; - mlog_errno(ret); - goto out; - } - - ret = ocfs2_find_path(INODE_CACHE(inode), path, cpos); - if (ret) { - mlog_errno(ret); - goto out; - } - - el = path_leaf_el(path); - - index = ocfs2_search_extent_list(el, cpos); - if (index == -1 || index >= le16_to_cpu(el->l_next_free_rec)) { - ocfs2_error(inode->i_sb, - "Inode %llu has an extent at cpos %u which can no " - "longer be found.\n", - (unsigned long long)ino, cpos); - ret = -EROFS; - goto out; - } - - rec = &el->l_recs[index]; - - BUG_ON(ext_flags != rec->e_flags); - /* - * after moving/defraging to new location, the extent is not going - * to be refcounted anymore. - */ - replace_rec.e_flags = ext_flags & ~OCFS2_EXT_REFCOUNTED; - - ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), - context->et.et_root_bh, - OCFS2_JOURNAL_ACCESS_WRITE); - if (ret) { - mlog_errno(ret); - goto out; - } - - ret = ocfs2_split_extent(handle, &context->et, path, index, - &replace_rec, context->meta_ac, - &context->dealloc); - if (ret) { - mlog_errno(ret); - goto out; - } - - ocfs2_journal_dirty(handle, context->et.et_root_bh); - - context->new_phys_cpos = new_p_cpos; - - /* - * need I to append truncate log for old clusters? - */ - if (old_blkno) { - if (ext_flags & OCFS2_EXT_REFCOUNTED) - ret = ocfs2_decrease_refcount(inode, handle, - ocfs2_blocks_to_clusters(osb->sb, - old_blkno), - len, context->meta_ac, - &context->dealloc, 1); - else - ret = ocfs2_truncate_log_append(osb, handle, - old_blkno, len); - } - -out: - return ret; -} - -/* - * lock allocators, and reserving appropriate number of bits for - * meta blocks and data clusters. - * - * in some cases, we don't need to reserve clusters, just let data_ac - * be NULL. - */ -static int ocfs2_lock_allocators_move_extents(struct inode *inode, - struct ocfs2_extent_tree *et, - u32 clusters_to_move, - u32 extents_to_split, - struct ocfs2_alloc_context **meta_ac, - struct ocfs2_alloc_context **data_ac, - int extra_blocks, - int *credits) -{ - int ret, num_free_extents; - unsigned int max_recs_needed = 2 * extents_to_split + clusters_to_move; - struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); - - num_free_extents = ocfs2_num_free_extents(osb, et); - if (num_free_extents < 0) { - ret = num_free_extents; - mlog_errno(ret); - goto out; - } - - if (!num_free_extents || - (ocfs2_sparse_alloc(osb) && num_free_extents < max_recs_needed)) - extra_blocks += ocfs2_extend_meta_needed(et->et_root_el); - - ret = ocfs2_reserve_new_metadata_blocks(osb, extra_blocks, meta_ac); - if (ret) { - mlog_errno(ret); - goto out; - } - - if (data_ac) { - ret = ocfs2_reserve_clusters(osb, clusters_to_move, data_ac); - if (ret) { - mlog_errno(ret); - goto out; - } - } - - *credits += ocfs2_calc_extend_credits(osb->sb, et->et_root_el, - clusters_to_move + 2); - - mlog(0, "reserve metadata_blocks: %d, data_clusters: %u, credits: %d\n", - extra_blocks, clusters_to_move, *credits); -out: - if (ret) { - if (*meta_ac) { - ocfs2_free_alloc_context(*meta_ac); - *meta_ac = NULL; - } - } - - return ret; -} - -/* - * Using one journal handle to guarantee the data consistency in case - * crash happens anywhere. - * - * XXX: defrag can end up with finishing partial extent as requested, - * due to not enough contiguous clusters can be found in allocator. - */ -static int ocfs2_defrag_extent(struct ocfs2_move_extents_context *context, - u32 cpos, u32 phys_cpos, u32 *len, int ext_flags) -{ - int ret, credits = 0, extra_blocks = 0, partial = context->partial; - handle_t *handle; - struct inode *inode = context->inode; - struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); - struct inode *tl_inode = osb->osb_tl_inode; - struct ocfs2_refcount_tree *ref_tree = NULL; - u32 new_phys_cpos, new_len; - u64 phys_blkno = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos); - - if ((ext_flags & OCFS2_EXT_REFCOUNTED) && *len) { - - BUG_ON(!(OCFS2_I(inode)->ip_dyn_features & - OCFS2_HAS_REFCOUNT_FL)); - - BUG_ON(!context->refcount_loc); - - ret = ocfs2_lock_refcount_tree(osb, context->refcount_loc, 1, - &ref_tree, NULL); - if (ret) { - mlog_errno(ret); - return ret; - } - - ret = ocfs2_prepare_refcount_change_for_del(inode, - context->refcount_loc, - phys_blkno, - *len, - &credits, - &extra_blocks); - if (ret) { - mlog_errno(ret); - goto out; - } - } - - ret = ocfs2_lock_allocators_move_extents(inode, &context->et, *len, 1, - &context->meta_ac, - &context->data_ac, - extra_blocks, &credits); - if (ret) { - mlog_errno(ret); - goto out; - } - - /* - * should be using allocation reservation strategy there? - * - * if (context->data_ac) - * context->data_ac->ac_resv = &OCFS2_I(inode)->ip_la_data_resv; - */ - - mutex_lock(&tl_inode->i_mutex); - - if (ocfs2_truncate_log_needs_flush(osb)) { - ret = __ocfs2_flush_truncate_log(osb); - if (ret < 0) { - mlog_errno(ret); - goto out_unlock_mutex; - } - } - - handle = ocfs2_start_trans(osb, credits); - if (IS_ERR(handle)) { - ret = PTR_ERR(handle); - mlog_errno(ret); - goto out_unlock_mutex; - } - - ret = __ocfs2_claim_clusters(handle, context->data_ac, 1, *len, - &new_phys_cpos, &new_len); - if (ret) { - mlog_errno(ret); - goto out_commit; - } - - /* - * allowing partial extent moving is kind of 'pros and cons', it makes - * whole defragmentation less likely to fail, on the contrary, the bad - * thing is it may make the fs even more fragmented after moving, let - * userspace make a good decision here. - */ - if (new_len != *len) { - mlog(0, "len_claimed: %u, len: %u\n", new_len, *len); - if (!partial) { - context->range->me_flags &= ~OCFS2_MOVE_EXT_FL_COMPLETE; - ret = -ENOSPC; - goto out_commit; - } - } - - mlog(0, "cpos: %u, phys_cpos: %u, new_phys_cpos: %u\n", cpos, - phys_cpos, new_phys_cpos); - - ret = __ocfs2_move_extent(handle, context, cpos, new_len, phys_cpos, - new_phys_cpos, ext_flags); - if (ret) - mlog_errno(ret); - - if (partial && (new_len != *len)) - *len = new_len; - - /* - * Here we should write the new page out first if we are - * in write-back mode. - */ - ret = ocfs2_cow_sync_writeback(inode->i_sb, context->inode, cpos, *len); - if (ret) - mlog_errno(ret); - -out_commit: - ocfs2_commit_trans(osb, handle); - -out_unlock_mutex: - mutex_unlock(&tl_inode->i_mutex); - - if (context->data_ac) { - ocfs2_free_alloc_context(context->data_ac); - context->data_ac = NULL; - } - - if (context->meta_ac) { - ocfs2_free_alloc_context(context->meta_ac); - context->meta_ac = NULL; - } - -out: - if (ref_tree) - ocfs2_unlock_refcount_tree(osb, ref_tree, 1); - - return ret; -} - -/* - * find the victim alloc group, where #blkno fits. - */ -static int ocfs2_find_victim_alloc_group(struct inode *inode, - u64 vict_blkno, - int type, int slot, - int *vict_bit, - struct buffer_head **ret_bh) -{ - int ret, i, bits_per_unit = 0; - u64 blkno; - char namebuf[40]; - - struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); - struct buffer_head *ac_bh = NULL, *gd_bh = NULL; - struct ocfs2_chain_list *cl; - struct ocfs2_chain_rec *rec; - struct ocfs2_dinode *ac_dinode; - struct ocfs2_group_desc *bg; - - ocfs2_sprintf_system_inode_name(namebuf, sizeof(namebuf), type, slot); - ret = ocfs2_lookup_ino_from_name(osb->sys_root_inode, namebuf, - strlen(namebuf), &blkno); - if (ret) { - ret = -ENOENT; - goto out; - } - - ret = ocfs2_read_blocks_sync(osb, blkno, 1, &ac_bh); - if (ret) { - mlog_errno(ret); - goto out; - } - - ac_dinode = (struct ocfs2_dinode *)ac_bh->b_data; - cl = &(ac_dinode->id2.i_chain); - rec = &(cl->cl_recs[0]); - - if (type == GLOBAL_BITMAP_SYSTEM_INODE) - bits_per_unit = osb->s_clustersize_bits - - inode->i_sb->s_blocksize_bits; - /* - * 'vict_blkno' was out of the valid range. - */ - if ((vict_blkno < le64_to_cpu(rec->c_blkno)) || - (vict_blkno >= (le32_to_cpu(ac_dinode->id1.bitmap1.i_total) << - bits_per_unit))) { - ret = -EINVAL; - goto out; - } - - for (i = 0; i < le16_to_cpu(cl->cl_next_free_rec); i++) { - - rec = &(cl->cl_recs[i]); - if (!rec) - continue; - - bg = NULL; - - do { - if (!bg) - blkno = le64_to_cpu(rec->c_blkno); - else - blkno = le64_to_cpu(bg->bg_next_group); - - if (gd_bh) { - brelse(gd_bh); - gd_bh = NULL; - } - - ret = ocfs2_read_blocks_sync(osb, blkno, 1, &gd_bh); - if (ret) { - mlog_errno(ret); - goto out; - } - - bg = (struct ocfs2_group_desc *)gd_bh->b_data; - - if (vict_blkno < (le64_to_cpu(bg->bg_blkno) + - le16_to_cpu(bg->bg_bits))) { - - *ret_bh = gd_bh; - *vict_bit = (vict_blkno - blkno) >> - bits_per_unit; - mlog(0, "find the victim group: #%llu, " - "total_bits: %u, vict_bit: %u\n", - blkno, le16_to_cpu(bg->bg_bits), - *vict_bit); - goto out; - } - - } while (le64_to_cpu(bg->bg_next_group)); - } - - ret = -EINVAL; -out: - brelse(ac_bh); - - /* - * caller has to release the gd_bh properly. - */ - return ret; -} - -/* - * XXX: helper to validate and adjust moving goal. - */ -static int ocfs2_validate_and_adjust_move_goal(struct inode *inode, - struct ocfs2_move_extents *range) -{ - int ret, goal_bit = 0; - - struct buffer_head *gd_bh = NULL; - struct ocfs2_group_desc *bg = NULL; - struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); - int c_to_b = 1 << (osb->s_clustersize_bits - - inode->i_sb->s_blocksize_bits); - - /* - * make goal become cluster aligned. - */ - range->me_goal = ocfs2_block_to_cluster_start(inode->i_sb, - range->me_goal); - /* - * moving goal is not allowd to start with a group desc blok(#0 blk) - * let's compromise to the latter cluster. - */ - if (range->me_goal == le64_to_cpu(bg->bg_blkno)) - range->me_goal += c_to_b; - - /* - * validate goal sits within global_bitmap, and return the victim - * group desc - */ - ret = ocfs2_find_victim_alloc_group(inode, range->me_goal, - GLOBAL_BITMAP_SYSTEM_INODE, - OCFS2_INVALID_SLOT, - &goal_bit, &gd_bh); - if (ret) - goto out; - - bg = (struct ocfs2_group_desc *)gd_bh->b_data; - - /* - * movement is not gonna cross two groups. - */ - if ((le16_to_cpu(bg->bg_bits) - goal_bit) * osb->s_clustersize < - range->me_len) { - ret = -EINVAL; - goto out; - } - /* - * more exact validations/adjustments will be performed later during - * moving operation for each extent range. - */ - mlog(0, "extents get ready to be moved to #%llu block\n", - range->me_goal); - -out: - brelse(gd_bh); - - return ret; -} - -static void ocfs2_probe_alloc_group(struct inode *inode, struct buffer_head *bh, - int *goal_bit, u32 move_len, u32 max_hop, - u32 *phys_cpos) -{ - int i, used, last_free_bits = 0, base_bit = *goal_bit; - struct ocfs2_group_desc *gd = (struct ocfs2_group_desc *)bh->b_data; - u32 base_cpos = ocfs2_blocks_to_clusters(inode->i_sb, - le64_to_cpu(gd->bg_blkno)); - - for (i = base_bit; i < le16_to_cpu(gd->bg_bits); i++) { - - used = ocfs2_test_bit(i, (unsigned long *)gd->bg_bitmap); - if (used) { - /* - * we even tried searching the free chunk by jumping - * a 'max_hop' distance, but still failed. - */ - if ((i - base_bit) > max_hop) { - *phys_cpos = 0; - break; - } - - if (last_free_bits) - last_free_bits = 0; - - continue; - } else - last_free_bits++; - - if (last_free_bits == move_len) { - *goal_bit = i; - *phys_cpos = base_cpos + i; - break; - } - } - - mlog(0, "found phys_cpos: %u to fit the wanted moving.\n", *phys_cpos); -} - -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 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); - - mlog(0, "block_group_set_bits: off = %u, num = %u\n", 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: - return status; -} - -static int ocfs2_move_extent(struct ocfs2_move_extents_context *context, - u32 cpos, u32 phys_cpos, u32 *new_phys_cpos, - u32 len, int ext_flags) -{ - int ret, credits = 0, extra_blocks = 0, goal_bit = 0; - handle_t *handle; - struct inode *inode = context->inode; - struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); - struct inode *tl_inode = osb->osb_tl_inode; - struct inode *gb_inode = NULL; - struct buffer_head *gb_bh = NULL; - struct buffer_head *gd_bh = NULL; - struct ocfs2_group_desc *gd; - struct ocfs2_refcount_tree *ref_tree = NULL; - u32 move_max_hop = ocfs2_blocks_to_clusters(inode->i_sb, - context->range->me_threshold); - u64 phys_blkno, new_phys_blkno; - - phys_blkno = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos); - - if ((ext_flags & OCFS2_EXT_REFCOUNTED) && len) { - - BUG_ON(!(OCFS2_I(inode)->ip_dyn_features & - OCFS2_HAS_REFCOUNT_FL)); - - BUG_ON(!context->refcount_loc); - - ret = ocfs2_lock_refcount_tree(osb, context->refcount_loc, 1, - &ref_tree, NULL); - if (ret) { - mlog_errno(ret); - return ret; - } - - ret = ocfs2_prepare_refcount_change_for_del(inode, - context->refcount_loc, - phys_blkno, - len, - &credits, - &extra_blocks); - if (ret) { - mlog_errno(ret); - goto out; - } - } - - ret = ocfs2_lock_allocators_move_extents(inode, &context->et, len, 1, - &context->meta_ac, - NULL, extra_blocks, &credits); - if (ret) { - mlog_errno(ret); - goto out; - } - - /* - * need to count 2 extra credits for global_bitmap inode and - * group descriptor. - */ - credits += OCFS2_INODE_UPDATE_CREDITS + 1; - - /* - * ocfs2_move_extent() didn't reserve any clusters in lock_allocators() - * logic, while we still need to lock the global_bitmap. - */ - gb_inode = ocfs2_get_system_file_inode(osb, GLOBAL_BITMAP_SYSTEM_INODE, - OCFS2_INVALID_SLOT); - if (!gb_inode) { - mlog(ML_ERROR, "unable to get global_bitmap inode\n"); - ret = -EIO; - goto out; - } - - mutex_lock(&gb_inode->i_mutex); - - ret = ocfs2_inode_lock(gb_inode, &gb_bh, 1); - if (ret) { - mlog_errno(ret); - goto out_unlock_gb_mutex; - } - - mutex_lock(&tl_inode->i_mutex); - - handle = ocfs2_start_trans(osb, credits); - if (IS_ERR(handle)) { - ret = PTR_ERR(handle); - mlog_errno(ret); - goto out_unlock_tl_inode; - } - - new_phys_blkno = ocfs2_clusters_to_blocks(inode->i_sb, *new_phys_cpos); - ret = ocfs2_find_victim_alloc_group(inode, new_phys_blkno, - GLOBAL_BITMAP_SYSTEM_INODE, - OCFS2_INVALID_SLOT, - &goal_bit, &gd_bh); - if (ret) { - mlog_errno(ret); - goto out_commit; - } - - /* - * probe the victim cluster group to find a proper - * region to fit wanted movement, it even will perfrom - * a best-effort attempt by compromising to a threshold - * around the goal. - */ - ocfs2_probe_alloc_group(inode, gd_bh, &goal_bit, len, move_max_hop, - new_phys_cpos); - if (!*new_phys_cpos) { - ret = -ENOSPC; - goto out_commit; - } - - ret = __ocfs2_move_extent(handle, context, cpos, len, phys_cpos, - *new_phys_cpos, ext_flags); - if (ret) { - mlog_errno(ret); - goto out_commit; - } - - gd = (struct ocfs2_group_desc *)gd_bh->b_data; - ret = ocfs2_alloc_dinode_update_counts(gb_inode, handle, gb_bh, len, - le16_to_cpu(gd->bg_chain)); - if (ret) { - mlog_errno(ret); - goto out_commit; - } - - ret = ocfs2_block_group_set_bits(handle, gb_inode, gd, gd_bh, - goal_bit, len); - if (ret) - mlog_errno(ret); - - /* - * Here we should write the new page out first if we are - * in write-back mode. - */ - ret = ocfs2_cow_sync_writeback(inode->i_sb, context->inode, cpos, len); - if (ret) - mlog_errno(ret); - -out_commit: - ocfs2_commit_trans(osb, handle); - brelse(gd_bh); - -out_unlock_tl_inode: - mutex_unlock(&tl_inode->i_mutex); - - ocfs2_inode_unlock(gb_inode, 1); -out_unlock_gb_mutex: - mutex_unlock(&gb_inode->i_mutex); - brelse(gb_bh); - iput(gb_inode); - -out: - if (context->meta_ac) { - ocfs2_free_alloc_context(context->meta_ac); - context->meta_ac = NULL; - } - - if (ref_tree) - ocfs2_unlock_refcount_tree(osb, ref_tree, 1); - - return ret; -} - -/* - * Helper to calculate the defraging length in one run according to threshold. - */ -static void ocfs2_calc_extent_defrag_len(u32 *alloc_size, u32 *len_defraged, - u32 threshold, int *skip) -{ - if ((*alloc_size + *len_defraged) < threshold) { - /* - * proceed defragmentation until we meet the thresh - */ - *len_defraged += *alloc_size; - } else if (*len_defraged == 0) { - /* - * XXX: skip a large extent. - */ - *skip = 1; - } else { - /* - * split this extent to coalesce with former pieces as - * to reach the threshold. - * - * we're done here with one cycle of defragmentation - * in a size of 'thresh', resetting 'len_defraged' - * forces a new defragmentation. - */ - *alloc_size = threshold - *len_defraged; - *len_defraged = 0; - } -} - -static int __ocfs2_move_extents_range(struct buffer_head *di_bh, - struct ocfs2_move_extents_context *context) -{ - int ret = 0, flags, do_defrag, skip = 0; - u32 cpos, phys_cpos, move_start, len_to_move, alloc_size; - u32 len_defraged = 0, defrag_thresh = 0, new_phys_cpos = 0; - - struct inode *inode = context->inode; - struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data; - struct ocfs2_move_extents *range = context->range; - struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); - - if ((inode->i_size == 0) || (range->me_len == 0)) - return 0; - - if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) - return 0; - - context->refcount_loc = le64_to_cpu(di->i_refcount_loc); - - ocfs2_init_dinode_extent_tree(&context->et, INODE_CACHE(inode), di_bh); - ocfs2_init_dealloc_ctxt(&context->dealloc); - - /* - * TO-DO XXX: - * - * - xattr extents. - */ - - do_defrag = context->auto_defrag; - - /* - * extents moving happens in unit of clusters, for the sake - * of simplicity, we may ignore two clusters where 'byte_start' - * and 'byte_start + len' were within. - */ - move_start = ocfs2_clusters_for_bytes(osb->sb, range->me_start); - len_to_move = (range->me_start + range->me_len) >> - osb->s_clustersize_bits; - if (len_to_move >= move_start) - len_to_move -= move_start; - else - len_to_move = 0; - - if (do_defrag) { - defrag_thresh = range->me_threshold >> osb->s_clustersize_bits; - if (defrag_thresh <= 1) - goto done; - } else - new_phys_cpos = ocfs2_blocks_to_clusters(inode->i_sb, - range->me_goal); - - mlog(0, "Inode: %llu, start: %llu, len: %llu, cstart: %u, clen: %u, " - "thresh: %u\n", - (unsigned long long)OCFS2_I(inode)->ip_blkno, - (unsigned long long)range->me_start, - (unsigned long long)range->me_len, - move_start, len_to_move, defrag_thresh); - - cpos = move_start; - while (len_to_move) { - ret = ocfs2_get_clusters(inode, cpos, &phys_cpos, &alloc_size, - &flags); - if (ret) { - mlog_errno(ret); - goto out; - } - - if (alloc_size > len_to_move) - alloc_size = len_to_move; - - /* - * XXX: how to deal with a hole: - * - * - skip the hole of course - * - force a new defragmentation - */ - if (!phys_cpos) { - if (do_defrag) - len_defraged = 0; - - goto next; - } - - if (do_defrag) { - ocfs2_calc_extent_defrag_len(&alloc_size, &len_defraged, - defrag_thresh, &skip); - /* - * skip large extents - */ - if (skip) { - skip = 0; - goto next; - } - - mlog(0, "#Defrag: cpos: %u, phys_cpos: %u, " - "alloc_size: %u, len_defraged: %u\n", - cpos, phys_cpos, alloc_size, len_defraged); - - ret = ocfs2_defrag_extent(context, cpos, phys_cpos, - &alloc_size, flags); - } else { - ret = ocfs2_move_extent(context, cpos, phys_cpos, - &new_phys_cpos, alloc_size, - flags); - - new_phys_cpos += alloc_size; - } - - if (ret < 0) { - mlog_errno(ret); - goto out; - } - - context->clusters_moved += alloc_size; -next: - cpos += alloc_size; - len_to_move -= alloc_size; - } - -done: - range->me_flags |= OCFS2_MOVE_EXT_FL_COMPLETE; - -out: - range->me_moved_len = ocfs2_clusters_to_bytes(osb->sb, - context->clusters_moved); - range->me_new_offset = ocfs2_clusters_to_bytes(osb->sb, - context->new_phys_cpos); - - ocfs2_schedule_truncate_log_flush(osb, 1); - ocfs2_run_deallocs(osb, &context->dealloc); - - return ret; -} - -static int ocfs2_move_extents(struct ocfs2_move_extents_context *context) -{ - int status; - handle_t *handle; - struct inode *inode = context->inode; - struct ocfs2_dinode *di; - struct buffer_head *di_bh = NULL; - struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); - - if (!inode) - return -ENOENT; - - if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb)) - return -EROFS; - - mutex_lock(&inode->i_mutex); - - /* - * This prevents concurrent writes from other nodes - */ - status = ocfs2_rw_lock(inode, 1); - if (status) { - mlog_errno(status); - goto out; - } - - status = ocfs2_inode_lock(inode, &di_bh, 1); - if (status) { - mlog_errno(status); - goto out_rw_unlock; - } - - /* - * rememer ip_xattr_sem also needs to be held if necessary - */ - down_write(&OCFS2_I(inode)->ip_alloc_sem); - - status = __ocfs2_move_extents_range(di_bh, context); - - up_write(&OCFS2_I(inode)->ip_alloc_sem); - if (status) { - mlog_errno(status); - goto out_inode_unlock; - } - - /* - * We update ctime for these changes - */ - handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS); - if (IS_ERR(handle)) { - status = PTR_ERR(handle); - mlog_errno(status); - goto out_inode_unlock; - } - - status = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh, - OCFS2_JOURNAL_ACCESS_WRITE); - if (status) { - mlog_errno(status); - goto out_commit; - } - - di = (struct ocfs2_dinode *)di_bh->b_data; - inode->i_ctime = CURRENT_TIME; - di->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec); - di->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec); - - ocfs2_journal_dirty(handle, di_bh); - -out_commit: - ocfs2_commit_trans(osb, handle); - -out_inode_unlock: - brelse(di_bh); - ocfs2_inode_unlock(inode, 1); -out_rw_unlock: - ocfs2_rw_unlock(inode, 1); -out: - mutex_unlock(&inode->i_mutex); - - return status; -} - -int ocfs2_ioctl_move_extents(struct file *filp, void __user *argp) -{ - int status; - - struct inode *inode = filp->f_path.dentry->d_inode; - struct ocfs2_move_extents range; - struct ocfs2_move_extents_context *context = NULL; - - status = mnt_want_write_file(filp); - if (status) - return status; - - if ((!S_ISREG(inode->i_mode)) || !(filp->f_mode & FMODE_WRITE)) - goto out; - - if (inode->i_flags & (S_IMMUTABLE|S_APPEND)) { - status = -EPERM; - goto out; - } - - context = kzalloc(sizeof(struct ocfs2_move_extents_context), GFP_NOFS); - if (!context) { - status = -ENOMEM; - mlog_errno(status); - goto out; - } - - context->inode = inode; - context->file = filp; - - if (argp) { - if (copy_from_user(&range, (struct ocfs2_move_extents *)argp, - sizeof(range))) { - status = -EFAULT; - goto out; - } - } else { - status = -EINVAL; - goto out; - } - - if (range.me_start > i_size_read(inode)) - goto out; - - if (range.me_start + range.me_len > i_size_read(inode)) - range.me_len = i_size_read(inode) - range.me_start; - - context->range = ⦥ - - if (range.me_flags & OCFS2_MOVE_EXT_FL_AUTO_DEFRAG) { - context->auto_defrag = 1; - /* - * ok, the default theshold for the defragmentation - * is 1M, since our maximum clustersize was 1M also. - * any thought? - */ - if (!range.me_threshold) - range.me_threshold = 1024 * 1024; - - if (range.me_threshold > i_size_read(inode)) - range.me_threshold = i_size_read(inode); - - if (range.me_flags & OCFS2_MOVE_EXT_FL_PART_DEFRAG) - context->partial = 1; - } else { - /* - * first best-effort attempt to validate and adjust the goal - * (physical address in block), while it can't guarantee later - * operation can succeed all the time since global_bitmap may - * change a bit over time. - */ - - status = ocfs2_validate_and_adjust_move_goal(inode, &range); - if (status) - goto out; - } - - status = ocfs2_move_extents(context); - if (status) - mlog_errno(status); -out: - /* - * movement/defragmentation may end up being partially completed, - * that's the reason why we need to return userspace the finished - * length and new_offset even if failure happens somewhere. - */ - if (argp) { - if (copy_to_user((struct ocfs2_move_extents *)argp, &range, - sizeof(range))) - status = -EFAULT; - } - - kfree(context); - - mnt_drop_write_file(filp); - - return status; -} |