diff options
Diffstat (limited to 'ANDROID_3.4.5/fs/ocfs2/refcounttree.c')
| -rw-r--r-- | ANDROID_3.4.5/fs/ocfs2/refcounttree.c | 4487 |
1 files changed, 0 insertions, 4487 deletions
diff --git a/ANDROID_3.4.5/fs/ocfs2/refcounttree.c b/ANDROID_3.4.5/fs/ocfs2/refcounttree.c deleted file mode 100644 index 9f32d7cb..00000000 --- a/ANDROID_3.4.5/fs/ocfs2/refcounttree.c +++ /dev/null @@ -1,4487 +0,0 @@ -/* -*- mode: c; c-basic-offset: 8; -*- - * vim: noexpandtab sw=8 ts=8 sts=0: - * - * refcounttree.c - * - * Copyright (C) 2009 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/sort.h> -#include <cluster/masklog.h> -#include "ocfs2.h" -#include "inode.h" -#include "alloc.h" -#include "suballoc.h" -#include "journal.h" -#include "uptodate.h" -#include "super.h" -#include "buffer_head_io.h" -#include "blockcheck.h" -#include "refcounttree.h" -#include "sysfile.h" -#include "dlmglue.h" -#include "extent_map.h" -#include "aops.h" -#include "xattr.h" -#include "namei.h" -#include "ocfs2_trace.h" - -#include <linux/bio.h> -#include <linux/blkdev.h> -#include <linux/slab.h> -#include <linux/writeback.h> -#include <linux/pagevec.h> -#include <linux/swap.h> -#include <linux/security.h> -#include <linux/fsnotify.h> -#include <linux/quotaops.h> -#include <linux/namei.h> -#include <linux/mount.h> - -struct ocfs2_cow_context { - struct inode *inode; - struct file *file; - u32 cow_start; - u32 cow_len; - struct ocfs2_extent_tree data_et; - struct ocfs2_refcount_tree *ref_tree; - struct buffer_head *ref_root_bh; - struct ocfs2_alloc_context *meta_ac; - struct ocfs2_alloc_context *data_ac; - struct ocfs2_cached_dealloc_ctxt dealloc; - void *cow_object; - struct ocfs2_post_refcount *post_refcount; - int extra_credits; - int (*get_clusters)(struct ocfs2_cow_context *context, - u32 v_cluster, u32 *p_cluster, - u32 *num_clusters, - unsigned int *extent_flags); - int (*cow_duplicate_clusters)(handle_t *handle, - struct file *file, - u32 cpos, u32 old_cluster, - u32 new_cluster, u32 new_len); -}; - -static inline struct ocfs2_refcount_tree * -cache_info_to_refcount(struct ocfs2_caching_info *ci) -{ - return container_of(ci, struct ocfs2_refcount_tree, rf_ci); -} - -static int ocfs2_validate_refcount_block(struct super_block *sb, - struct buffer_head *bh) -{ - int rc; - struct ocfs2_refcount_block *rb = - (struct ocfs2_refcount_block *)bh->b_data; - - trace_ocfs2_validate_refcount_block((unsigned long long)bh->b_blocknr); - - BUG_ON(!buffer_uptodate(bh)); - - /* - * If the ecc fails, we return the error but otherwise - * leave the filesystem running. We know any error is - * local to this block. - */ - rc = ocfs2_validate_meta_ecc(sb, bh->b_data, &rb->rf_check); - if (rc) { - mlog(ML_ERROR, "Checksum failed for refcount block %llu\n", - (unsigned long long)bh->b_blocknr); - return rc; - } - - - if (!OCFS2_IS_VALID_REFCOUNT_BLOCK(rb)) { - ocfs2_error(sb, - "Refcount block #%llu has bad signature %.*s", - (unsigned long long)bh->b_blocknr, 7, - rb->rf_signature); - return -EINVAL; - } - - if (le64_to_cpu(rb->rf_blkno) != bh->b_blocknr) { - ocfs2_error(sb, - "Refcount block #%llu has an invalid rf_blkno " - "of %llu", - (unsigned long long)bh->b_blocknr, - (unsigned long long)le64_to_cpu(rb->rf_blkno)); - return -EINVAL; - } - - if (le32_to_cpu(rb->rf_fs_generation) != OCFS2_SB(sb)->fs_generation) { - ocfs2_error(sb, - "Refcount block #%llu has an invalid " - "rf_fs_generation of #%u", - (unsigned long long)bh->b_blocknr, - le32_to_cpu(rb->rf_fs_generation)); - return -EINVAL; - } - - return 0; -} - -static int ocfs2_read_refcount_block(struct ocfs2_caching_info *ci, - u64 rb_blkno, - struct buffer_head **bh) -{ - int rc; - struct buffer_head *tmp = *bh; - - rc = ocfs2_read_block(ci, rb_blkno, &tmp, - ocfs2_validate_refcount_block); - - /* If ocfs2_read_block() got us a new bh, pass it up. */ - if (!rc && !*bh) - *bh = tmp; - - return rc; -} - -static u64 ocfs2_refcount_cache_owner(struct ocfs2_caching_info *ci) -{ - struct ocfs2_refcount_tree *rf = cache_info_to_refcount(ci); - - return rf->rf_blkno; -} - -static struct super_block * -ocfs2_refcount_cache_get_super(struct ocfs2_caching_info *ci) -{ - struct ocfs2_refcount_tree *rf = cache_info_to_refcount(ci); - - return rf->rf_sb; -} - -static void ocfs2_refcount_cache_lock(struct ocfs2_caching_info *ci) -{ - struct ocfs2_refcount_tree *rf = cache_info_to_refcount(ci); - - spin_lock(&rf->rf_lock); -} - -static void ocfs2_refcount_cache_unlock(struct ocfs2_caching_info *ci) -{ - struct ocfs2_refcount_tree *rf = cache_info_to_refcount(ci); - - spin_unlock(&rf->rf_lock); -} - -static void ocfs2_refcount_cache_io_lock(struct ocfs2_caching_info *ci) -{ - struct ocfs2_refcount_tree *rf = cache_info_to_refcount(ci); - - mutex_lock(&rf->rf_io_mutex); -} - -static void ocfs2_refcount_cache_io_unlock(struct ocfs2_caching_info *ci) -{ - struct ocfs2_refcount_tree *rf = cache_info_to_refcount(ci); - - mutex_unlock(&rf->rf_io_mutex); -} - -static const struct ocfs2_caching_operations ocfs2_refcount_caching_ops = { - .co_owner = ocfs2_refcount_cache_owner, - .co_get_super = ocfs2_refcount_cache_get_super, - .co_cache_lock = ocfs2_refcount_cache_lock, - .co_cache_unlock = ocfs2_refcount_cache_unlock, - .co_io_lock = ocfs2_refcount_cache_io_lock, - .co_io_unlock = ocfs2_refcount_cache_io_unlock, -}; - -static struct ocfs2_refcount_tree * -ocfs2_find_refcount_tree(struct ocfs2_super *osb, u64 blkno) -{ - struct rb_node *n = osb->osb_rf_lock_tree.rb_node; - struct ocfs2_refcount_tree *tree = NULL; - - while (n) { - tree = rb_entry(n, struct ocfs2_refcount_tree, rf_node); - - if (blkno < tree->rf_blkno) - n = n->rb_left; - else if (blkno > tree->rf_blkno) - n = n->rb_right; - else - return tree; - } - - return NULL; -} - -/* osb_lock is already locked. */ -static void ocfs2_insert_refcount_tree(struct ocfs2_super *osb, - struct ocfs2_refcount_tree *new) -{ - u64 rf_blkno = new->rf_blkno; - struct rb_node *parent = NULL; - struct rb_node **p = &osb->osb_rf_lock_tree.rb_node; - struct ocfs2_refcount_tree *tmp; - - while (*p) { - parent = *p; - - tmp = rb_entry(parent, struct ocfs2_refcount_tree, - rf_node); - - if (rf_blkno < tmp->rf_blkno) - p = &(*p)->rb_left; - else if (rf_blkno > tmp->rf_blkno) - p = &(*p)->rb_right; - else { - /* This should never happen! */ - mlog(ML_ERROR, "Duplicate refcount block %llu found!\n", - (unsigned long long)rf_blkno); - BUG(); - } - } - - rb_link_node(&new->rf_node, parent, p); - rb_insert_color(&new->rf_node, &osb->osb_rf_lock_tree); -} - -static void ocfs2_free_refcount_tree(struct ocfs2_refcount_tree *tree) -{ - ocfs2_metadata_cache_exit(&tree->rf_ci); - ocfs2_simple_drop_lockres(OCFS2_SB(tree->rf_sb), &tree->rf_lockres); - ocfs2_lock_res_free(&tree->rf_lockres); - kfree(tree); -} - -static inline void -ocfs2_erase_refcount_tree_from_list_no_lock(struct ocfs2_super *osb, - struct ocfs2_refcount_tree *tree) -{ - rb_erase(&tree->rf_node, &osb->osb_rf_lock_tree); - if (osb->osb_ref_tree_lru && osb->osb_ref_tree_lru == tree) - osb->osb_ref_tree_lru = NULL; -} - -static void ocfs2_erase_refcount_tree_from_list(struct ocfs2_super *osb, - struct ocfs2_refcount_tree *tree) -{ - spin_lock(&osb->osb_lock); - ocfs2_erase_refcount_tree_from_list_no_lock(osb, tree); - spin_unlock(&osb->osb_lock); -} - -static void ocfs2_kref_remove_refcount_tree(struct kref *kref) -{ - struct ocfs2_refcount_tree *tree = - container_of(kref, struct ocfs2_refcount_tree, rf_getcnt); - - ocfs2_free_refcount_tree(tree); -} - -static inline void -ocfs2_refcount_tree_get(struct ocfs2_refcount_tree *tree) -{ - kref_get(&tree->rf_getcnt); -} - -static inline void -ocfs2_refcount_tree_put(struct ocfs2_refcount_tree *tree) -{ - kref_put(&tree->rf_getcnt, ocfs2_kref_remove_refcount_tree); -} - -static inline void ocfs2_init_refcount_tree_ci(struct ocfs2_refcount_tree *new, - struct super_block *sb) -{ - ocfs2_metadata_cache_init(&new->rf_ci, &ocfs2_refcount_caching_ops); - mutex_init(&new->rf_io_mutex); - new->rf_sb = sb; - spin_lock_init(&new->rf_lock); -} - -static inline void ocfs2_init_refcount_tree_lock(struct ocfs2_super *osb, - struct ocfs2_refcount_tree *new, - u64 rf_blkno, u32 generation) -{ - init_rwsem(&new->rf_sem); - ocfs2_refcount_lock_res_init(&new->rf_lockres, osb, - rf_blkno, generation); -} - -static struct ocfs2_refcount_tree* -ocfs2_allocate_refcount_tree(struct ocfs2_super *osb, u64 rf_blkno) -{ - struct ocfs2_refcount_tree *new; - - new = kzalloc(sizeof(struct ocfs2_refcount_tree), GFP_NOFS); - if (!new) - return NULL; - - new->rf_blkno = rf_blkno; - kref_init(&new->rf_getcnt); - ocfs2_init_refcount_tree_ci(new, osb->sb); - - return new; -} - -static int ocfs2_get_refcount_tree(struct ocfs2_super *osb, u64 rf_blkno, - struct ocfs2_refcount_tree **ret_tree) -{ - int ret = 0; - struct ocfs2_refcount_tree *tree, *new = NULL; - struct buffer_head *ref_root_bh = NULL; - struct ocfs2_refcount_block *ref_rb; - - spin_lock(&osb->osb_lock); - if (osb->osb_ref_tree_lru && - osb->osb_ref_tree_lru->rf_blkno == rf_blkno) - tree = osb->osb_ref_tree_lru; - else - tree = ocfs2_find_refcount_tree(osb, rf_blkno); - if (tree) - goto out; - - spin_unlock(&osb->osb_lock); - - new = ocfs2_allocate_refcount_tree(osb, rf_blkno); - if (!new) { - ret = -ENOMEM; - mlog_errno(ret); - return ret; - } - /* - * We need the generation to create the refcount tree lock and since - * it isn't changed during the tree modification, we are safe here to - * read without protection. - * We also have to purge the cache after we create the lock since the - * refcount block may have the stale data. It can only be trusted when - * we hold the refcount lock. - */ - ret = ocfs2_read_refcount_block(&new->rf_ci, rf_blkno, &ref_root_bh); - if (ret) { - mlog_errno(ret); - ocfs2_metadata_cache_exit(&new->rf_ci); - kfree(new); - return ret; - } - - ref_rb = (struct ocfs2_refcount_block *)ref_root_bh->b_data; - new->rf_generation = le32_to_cpu(ref_rb->rf_generation); - ocfs2_init_refcount_tree_lock(osb, new, rf_blkno, - new->rf_generation); - ocfs2_metadata_cache_purge(&new->rf_ci); - - spin_lock(&osb->osb_lock); - tree = ocfs2_find_refcount_tree(osb, rf_blkno); - if (tree) - goto out; - - ocfs2_insert_refcount_tree(osb, new); - - tree = new; - new = NULL; - -out: - *ret_tree = tree; - - osb->osb_ref_tree_lru = tree; - - spin_unlock(&osb->osb_lock); - - if (new) - ocfs2_free_refcount_tree(new); - - brelse(ref_root_bh); - return ret; -} - -static int ocfs2_get_refcount_block(struct inode *inode, u64 *ref_blkno) -{ - int ret; - struct buffer_head *di_bh = NULL; - struct ocfs2_dinode *di; - - ret = ocfs2_read_inode_block(inode, &di_bh); - if (ret) { - mlog_errno(ret); - goto out; - } - - BUG_ON(!(OCFS2_I(inode)->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL)); - - di = (struct ocfs2_dinode *)di_bh->b_data; - *ref_blkno = le64_to_cpu(di->i_refcount_loc); - brelse(di_bh); -out: - return ret; -} - -static int __ocfs2_lock_refcount_tree(struct ocfs2_super *osb, - struct ocfs2_refcount_tree *tree, int rw) -{ - int ret; - - ret = ocfs2_refcount_lock(tree, rw); - if (ret) { - mlog_errno(ret); - goto out; - } - - if (rw) - down_write(&tree->rf_sem); - else - down_read(&tree->rf_sem); - -out: - return ret; -} - -/* - * Lock the refcount tree pointed by ref_blkno and return the tree. - * In most case, we lock the tree and read the refcount block. - * So read it here if the caller really needs it. - * - * If the tree has been re-created by other node, it will free the - * old one and re-create it. - */ -int ocfs2_lock_refcount_tree(struct ocfs2_super *osb, - u64 ref_blkno, int rw, - struct ocfs2_refcount_tree **ret_tree, - struct buffer_head **ref_bh) -{ - int ret, delete_tree = 0; - struct ocfs2_refcount_tree *tree = NULL; - struct buffer_head *ref_root_bh = NULL; - struct ocfs2_refcount_block *rb; - -again: - ret = ocfs2_get_refcount_tree(osb, ref_blkno, &tree); - if (ret) { - mlog_errno(ret); - return ret; - } - - ocfs2_refcount_tree_get(tree); - - ret = __ocfs2_lock_refcount_tree(osb, tree, rw); - if (ret) { - mlog_errno(ret); - ocfs2_refcount_tree_put(tree); - goto out; - } - - ret = ocfs2_read_refcount_block(&tree->rf_ci, tree->rf_blkno, - &ref_root_bh); - if (ret) { - mlog_errno(ret); - ocfs2_unlock_refcount_tree(osb, tree, rw); - ocfs2_refcount_tree_put(tree); - goto out; - } - - rb = (struct ocfs2_refcount_block *)ref_root_bh->b_data; - /* - * If the refcount block has been freed and re-created, we may need - * to recreate the refcount tree also. - * - * Here we just remove the tree from the rb-tree, and the last - * kref holder will unlock and delete this refcount_tree. - * Then we goto "again" and ocfs2_get_refcount_tree will create - * the new refcount tree for us. - */ - if (tree->rf_generation != le32_to_cpu(rb->rf_generation)) { - if (!tree->rf_removed) { - ocfs2_erase_refcount_tree_from_list(osb, tree); - tree->rf_removed = 1; - delete_tree = 1; - } - - ocfs2_unlock_refcount_tree(osb, tree, rw); - /* - * We get an extra reference when we create the refcount - * tree, so another put will destroy it. - */ - if (delete_tree) - ocfs2_refcount_tree_put(tree); - brelse(ref_root_bh); - ref_root_bh = NULL; - goto again; - } - - *ret_tree = tree; - if (ref_bh) { - *ref_bh = ref_root_bh; - ref_root_bh = NULL; - } -out: - brelse(ref_root_bh); - return ret; -} - -void ocfs2_unlock_refcount_tree(struct ocfs2_super *osb, - struct ocfs2_refcount_tree *tree, int rw) -{ - if (rw) - up_write(&tree->rf_sem); - else - up_read(&tree->rf_sem); - - ocfs2_refcount_unlock(tree, rw); - ocfs2_refcount_tree_put(tree); -} - -void ocfs2_purge_refcount_trees(struct ocfs2_super *osb) -{ - struct rb_node *node; - struct ocfs2_refcount_tree *tree; - struct rb_root *root = &osb->osb_rf_lock_tree; - - while ((node = rb_last(root)) != NULL) { - tree = rb_entry(node, struct ocfs2_refcount_tree, rf_node); - - trace_ocfs2_purge_refcount_trees( - (unsigned long long) tree->rf_blkno); - - rb_erase(&tree->rf_node, root); - ocfs2_free_refcount_tree(tree); - } -} - -/* - * Create a refcount tree for an inode. - * We take for granted that the inode is already locked. - */ -static int ocfs2_create_refcount_tree(struct inode *inode, - struct buffer_head *di_bh) -{ - int ret; - handle_t *handle = NULL; - struct ocfs2_alloc_context *meta_ac = NULL; - struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data; - struct ocfs2_inode_info *oi = OCFS2_I(inode); - struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); - struct buffer_head *new_bh = NULL; - struct ocfs2_refcount_block *rb; - struct ocfs2_refcount_tree *new_tree = NULL, *tree = NULL; - u16 suballoc_bit_start; - u32 num_got; - u64 suballoc_loc, first_blkno; - - BUG_ON(oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL); - - trace_ocfs2_create_refcount_tree( - (unsigned long long)OCFS2_I(inode)->ip_blkno); - - ret = ocfs2_reserve_new_metadata_blocks(osb, 1, &meta_ac); - if (ret) { - mlog_errno(ret); - goto out; - } - - handle = ocfs2_start_trans(osb, OCFS2_REFCOUNT_TREE_CREATE_CREDITS); - if (IS_ERR(handle)) { - ret = PTR_ERR(handle); - mlog_errno(ret); - goto out; - } - - ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh, - OCFS2_JOURNAL_ACCESS_WRITE); - if (ret) { - mlog_errno(ret); - goto out_commit; - } - - ret = ocfs2_claim_metadata(handle, meta_ac, 1, &suballoc_loc, - &suballoc_bit_start, &num_got, - &first_blkno); - if (ret) { - mlog_errno(ret); - goto out_commit; - } - - new_tree = ocfs2_allocate_refcount_tree(osb, first_blkno); - if (!new_tree) { - ret = -ENOMEM; - mlog_errno(ret); - goto out_commit; - } - - new_bh = sb_getblk(inode->i_sb, first_blkno); - ocfs2_set_new_buffer_uptodate(&new_tree->rf_ci, new_bh); - - ret = ocfs2_journal_access_rb(handle, &new_tree->rf_ci, new_bh, - OCFS2_JOURNAL_ACCESS_CREATE); - if (ret) { - mlog_errno(ret); - goto out_commit; - } - - /* Initialize ocfs2_refcount_block. */ - rb = (struct ocfs2_refcount_block *)new_bh->b_data; - memset(rb, 0, inode->i_sb->s_blocksize); - strcpy((void *)rb, OCFS2_REFCOUNT_BLOCK_SIGNATURE); - rb->rf_suballoc_slot = cpu_to_le16(meta_ac->ac_alloc_slot); - rb->rf_suballoc_loc = cpu_to_le64(suballoc_loc); - rb->rf_suballoc_bit = cpu_to_le16(suballoc_bit_start); - rb->rf_fs_generation = cpu_to_le32(osb->fs_generation); - rb->rf_blkno = cpu_to_le64(first_blkno); - rb->rf_count = cpu_to_le32(1); - rb->rf_records.rl_count = - cpu_to_le16(ocfs2_refcount_recs_per_rb(osb->sb)); - spin_lock(&osb->osb_lock); - rb->rf_generation = osb->s_next_generation++; - spin_unlock(&osb->osb_lock); - - ocfs2_journal_dirty(handle, new_bh); - - spin_lock(&oi->ip_lock); - oi->ip_dyn_features |= OCFS2_HAS_REFCOUNT_FL; - di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features); - di->i_refcount_loc = cpu_to_le64(first_blkno); - spin_unlock(&oi->ip_lock); - - trace_ocfs2_create_refcount_tree_blkno((unsigned long long)first_blkno); - - ocfs2_journal_dirty(handle, di_bh); - - /* - * We have to init the tree lock here since it will use - * the generation number to create it. - */ - new_tree->rf_generation = le32_to_cpu(rb->rf_generation); - ocfs2_init_refcount_tree_lock(osb, new_tree, first_blkno, - new_tree->rf_generation); - - spin_lock(&osb->osb_lock); - tree = ocfs2_find_refcount_tree(osb, first_blkno); - - /* - * We've just created a new refcount tree in this block. If - * we found a refcount tree on the ocfs2_super, it must be - * one we just deleted. We free the old tree before - * inserting the new tree. - */ - BUG_ON(tree && tree->rf_generation == new_tree->rf_generation); - if (tree) - ocfs2_erase_refcount_tree_from_list_no_lock(osb, tree); - ocfs2_insert_refcount_tree(osb, new_tree); - spin_unlock(&osb->osb_lock); - new_tree = NULL; - if (tree) - ocfs2_refcount_tree_put(tree); - -out_commit: - ocfs2_commit_trans(osb, handle); - -out: - if (new_tree) { - ocfs2_metadata_cache_exit(&new_tree->rf_ci); - kfree(new_tree); - } - - brelse(new_bh); - if (meta_ac) - ocfs2_free_alloc_context(meta_ac); - - return ret; -} - -static int ocfs2_set_refcount_tree(struct inode *inode, - struct buffer_head *di_bh, - u64 refcount_loc) -{ - int ret; - handle_t *handle = NULL; - struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data; - struct ocfs2_inode_info *oi = OCFS2_I(inode); - struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); - struct buffer_head *ref_root_bh = NULL; - struct ocfs2_refcount_block *rb; - struct ocfs2_refcount_tree *ref_tree; - - BUG_ON(oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL); - - ret = ocfs2_lock_refcount_tree(osb, refcount_loc, 1, - &ref_tree, &ref_root_bh); - if (ret) { - mlog_errno(ret); - return ret; - } - - handle = ocfs2_start_trans(osb, OCFS2_REFCOUNT_TREE_SET_CREDITS); - if (IS_ERR(handle)) { - ret = PTR_ERR(handle); - mlog_errno(ret); - goto out; - } - - ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh, - OCFS2_JOURNAL_ACCESS_WRITE); - if (ret) { - mlog_errno(ret); - goto out_commit; - } - - ret = ocfs2_journal_access_rb(handle, &ref_tree->rf_ci, ref_root_bh, - OCFS2_JOURNAL_ACCESS_WRITE); - if (ret) { - mlog_errno(ret); - goto out_commit; - } - - rb = (struct ocfs2_refcount_block *)ref_root_bh->b_data; - le32_add_cpu(&rb->rf_count, 1); - - ocfs2_journal_dirty(handle, ref_root_bh); - - spin_lock(&oi->ip_lock); - oi->ip_dyn_features |= OCFS2_HAS_REFCOUNT_FL; - di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features); - di->i_refcount_loc = cpu_to_le64(refcount_loc); - spin_unlock(&oi->ip_lock); - ocfs2_journal_dirty(handle, di_bh); - -out_commit: - ocfs2_commit_trans(osb, handle); -out: - ocfs2_unlock_refcount_tree(osb, ref_tree, 1); - brelse(ref_root_bh); - - return ret; -} - -int ocfs2_remove_refcount_tree(struct inode *inode, struct buffer_head *di_bh) -{ - int ret, delete_tree = 0; - handle_t *handle = NULL; - struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data; - struct ocfs2_inode_info *oi = OCFS2_I(inode); - struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); - struct ocfs2_refcount_block *rb; - struct inode *alloc_inode = NULL; - struct buffer_head *alloc_bh = NULL; - struct buffer_head *blk_bh = NULL; - struct ocfs2_refcount_tree *ref_tree; - int credits = OCFS2_REFCOUNT_TREE_REMOVE_CREDITS; - u64 blk = 0, bg_blkno = 0, ref_blkno = le64_to_cpu(di->i_refcount_loc); - u16 bit = 0; - - if (!(oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL)) - return 0; - - BUG_ON(!ref_blkno); - ret = ocfs2_lock_refcount_tree(osb, ref_blkno, 1, &ref_tree, &blk_bh); - if (ret) { - mlog_errno(ret); - return ret; - } - - rb = (struct ocfs2_refcount_block *)blk_bh->b_data; - - /* - * If we are the last user, we need to free the block. - * So lock the allocator ahead. - */ - if (le32_to_cpu(rb->rf_count) == 1) { - blk = le64_to_cpu(rb->rf_blkno); - bit = le16_to_cpu(rb->rf_suballoc_bit); - if (rb->rf_suballoc_loc) - bg_blkno = le64_to_cpu(rb->rf_suballoc_loc); - else - bg_blkno = ocfs2_which_suballoc_group(blk, bit); - - alloc_inode = ocfs2_get_system_file_inode(osb, - EXTENT_ALLOC_SYSTEM_INODE, - le16_to_cpu(rb->rf_suballoc_slot)); - if (!alloc_inode) { - ret = -ENOMEM; - mlog_errno(ret); - goto out; - } - mutex_lock(&alloc_inode->i_mutex); - - ret = ocfs2_inode_lock(alloc_inode, &alloc_bh, 1); - if (ret) { - mlog_errno(ret); - goto out_mutex; - } - - credits += OCFS2_SUBALLOC_FREE; - } - - handle = ocfs2_start_trans(osb, credits); - if (IS_ERR(handle)) { - ret = PTR_ERR(handle); - mlog_errno(ret); - goto out_unlock; - } - - ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh, - OCFS2_JOURNAL_ACCESS_WRITE); - if (ret) { - mlog_errno(ret); - goto out_commit; - } - - ret = ocfs2_journal_access_rb(handle, &ref_tree->rf_ci, blk_bh, - OCFS2_JOURNAL_ACCESS_WRITE); - if (ret) { - mlog_errno(ret); - goto out_commit; - } - - spin_lock(&oi->ip_lock); - oi->ip_dyn_features &= ~OCFS2_HAS_REFCOUNT_FL; - di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features); - di->i_refcount_loc = 0; - spin_unlock(&oi->ip_lock); - ocfs2_journal_dirty(handle, di_bh); - - le32_add_cpu(&rb->rf_count , -1); - ocfs2_journal_dirty(handle, blk_bh); - - if (!rb->rf_count) { - delete_tree = 1; - ocfs2_erase_refcount_tree_from_list(osb, ref_tree); - ret = ocfs2_free_suballoc_bits(handle, alloc_inode, - alloc_bh, bit, bg_blkno, 1); - if (ret) - mlog_errno(ret); - } - -out_commit: - ocfs2_commit_trans(osb, handle); -out_unlock: - if (alloc_inode) { - ocfs2_inode_unlock(alloc_inode, 1); - brelse(alloc_bh); - } -out_mutex: - if (alloc_inode) { - mutex_unlock(&alloc_inode->i_mutex); - iput(alloc_inode); - } -out: - ocfs2_unlock_refcount_tree(osb, ref_tree, 1); - if (delete_tree) - ocfs2_refcount_tree_put(ref_tree); - brelse(blk_bh); - - return ret; -} - -static void ocfs2_find_refcount_rec_in_rl(struct ocfs2_caching_info *ci, - struct buffer_head *ref_leaf_bh, - u64 cpos, unsigned int len, - struct ocfs2_refcount_rec *ret_rec, - int *index) -{ - int i = 0; - struct ocfs2_refcount_block *rb = - (struct ocfs2_refcount_block *)ref_leaf_bh->b_data; - struct ocfs2_refcount_rec *rec = NULL; - - for (; i < le16_to_cpu(rb->rf_records.rl_used); i++) { - rec = &rb->rf_records.rl_recs[i]; - - if (le64_to_cpu(rec->r_cpos) + - le32_to_cpu(rec->r_clusters) <= cpos) - continue; - else if (le64_to_cpu(rec->r_cpos) > cpos) - break; - - /* ok, cpos fail in this rec. Just return. */ - if (ret_rec) - *ret_rec = *rec; - goto out; - } - - if (ret_rec) { - /* We meet with a hole here, so fake the rec. */ - ret_rec->r_cpos = cpu_to_le64(cpos); - ret_rec->r_refcount = 0; - if (i < le16_to_cpu(rb->rf_records.rl_used) && - le64_to_cpu(rec->r_cpos) < cpos + len) - ret_rec->r_clusters = - cpu_to_le32(le64_to_cpu(rec->r_cpos) - cpos); - else - ret_rec->r_clusters = cpu_to_le32(len); - } - -out: - *index = i; -} - -/* - * Try to remove refcount tree. The mechanism is: - * 1) Check whether i_clusters == 0, if no, exit. - * 2) check whether we have i_xattr_loc in dinode. if yes, exit. - * 3) Check whether we have inline xattr stored outside, if yes, exit. - * 4) Remove the tree. - */ -int ocfs2_try_remove_refcount_tree(struct inode *inode, - struct buffer_head *di_bh) -{ - int ret; - struct ocfs2_inode_info *oi = OCFS2_I(inode); - struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data; - - down_write(&oi->ip_xattr_sem); - down_write(&oi->ip_alloc_sem); - - if (oi->ip_clusters) - goto out; - - if ((oi->ip_dyn_features & OCFS2_HAS_XATTR_FL) && di->i_xattr_loc) - goto out; - - if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL && - ocfs2_has_inline_xattr_value_outside(inode, di)) - goto out; - - ret = ocfs2_remove_refcount_tree(inode, di_bh); - if (ret) - mlog_errno(ret); -out: - up_write(&oi->ip_alloc_sem); - up_write(&oi->ip_xattr_sem); - return 0; -} - -/* - * Find the end range for a leaf refcount block indicated by - * el->l_recs[index].e_blkno. - */ -static int ocfs2_get_refcount_cpos_end(struct ocfs2_caching_info *ci, - struct buffer_head *ref_root_bh, - struct ocfs2_extent_block *eb, - struct ocfs2_extent_list *el, - int index, u32 *cpos_end) -{ - int ret, i, subtree_root; - u32 cpos; - u64 blkno; - struct super_block *sb = ocfs2_metadata_cache_get_super(ci); - struct ocfs2_path *left_path = NULL, *right_path = NULL; - struct ocfs2_extent_tree et; - struct ocfs2_extent_list *tmp_el; - - if (index < le16_to_cpu(el->l_next_free_rec) - 1) { - /* - * We have a extent rec after index, so just use the e_cpos - * of the next extent rec. - */ - *cpos_end = le32_to_cpu(el->l_recs[index+1].e_cpos); - return 0; - } - - if (!eb || (eb && !eb->h_next_leaf_blk)) { - /* - * We are the last extent rec, so any high cpos should - * be stored in this leaf refcount block. - */ - *cpos_end = UINT_MAX; - return 0; - } - - /* - * If the extent block isn't the last one, we have to find - * the subtree root between this extent block and the next - * leaf extent block and get the corresponding e_cpos from - * the subroot. Otherwise we may corrupt the b-tree. - */ - ocfs2_init_refcount_extent_tree(&et, ci, ref_root_bh); - - left_path = ocfs2_new_path_from_et(&et); - if (!left_path) { - ret = -ENOMEM; - mlog_errno(ret); - goto out; - } - - cpos = le32_to_cpu(eb->h_list.l_recs[index].e_cpos); - ret = ocfs2_find_path(ci, left_path, cpos); - if (ret) { - mlog_errno(ret); - goto out; - } - - right_path = ocfs2_new_path_from_path(left_path); - if (!right_path) { - ret = -ENOMEM; - mlog_errno(ret); - goto out; - } - - ret = ocfs2_find_cpos_for_right_leaf(sb, left_path, &cpos); - if (ret) { - mlog_errno(ret); - goto out; - } - - ret = ocfs2_find_path(ci, right_path, cpos); - if (ret) { - mlog_errno(ret); - goto out; - } - - subtree_root = ocfs2_find_subtree_root(&et, left_path, - right_path); - - tmp_el = left_path->p_node[subtree_root].el; - blkno = left_path->p_node[subtree_root+1].bh->b_blocknr; - for (i = 0; i < le16_to_cpu(tmp_el->l_next_free_rec); i++) { - if (le64_to_cpu(tmp_el->l_recs[i].e_blkno) == blkno) { - *cpos_end = le32_to_cpu(tmp_el->l_recs[i+1].e_cpos); - break; - } - } - - BUG_ON(i == le16_to_cpu(tmp_el->l_next_free_rec)); - -out: - ocfs2_free_path(left_path); - ocfs2_free_path(right_path); - return ret; -} - -/* - * Given a cpos and len, try to find the refcount record which contains cpos. - * 1. If cpos can be found in one refcount record, return the record. - * 2. If cpos can't be found, return a fake record which start from cpos - * and end at a small value between cpos+len and start of the next record. - * This fake record has r_refcount = 0. - */ -static int ocfs2_get_refcount_rec(struct ocfs2_caching_info *ci, - struct buffer_head *ref_root_bh, - u64 cpos, unsigned int len, - struct ocfs2_refcount_rec *ret_rec, - int *index, - struct buffer_head **ret_bh) -{ - int ret = 0, i, found; - u32 low_cpos, uninitialized_var(cpos_end); - struct ocfs2_extent_list *el; - struct ocfs2_extent_rec *rec = NULL; - struct ocfs2_extent_block *eb = NULL; - struct buffer_head *eb_bh = NULL, *ref_leaf_bh = NULL; - struct super_block *sb = ocfs2_metadata_cache_get_super(ci); - struct ocfs2_refcount_block *rb = - (struct ocfs2_refcount_block *)ref_root_bh->b_data; - - if (!(le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL)) { - ocfs2_find_refcount_rec_in_rl(ci, ref_root_bh, cpos, len, - ret_rec, index); - *ret_bh = ref_root_bh; - get_bh(ref_root_bh); - return 0; - } - - el = &rb->rf_list; - low_cpos = cpos & OCFS2_32BIT_POS_MASK; - - if (el->l_tree_depth) { - ret = ocfs2_find_leaf(ci, el, low_cpos, &eb_bh); - if (ret) { - mlog_errno(ret); - goto out; - } - - eb = (struct ocfs2_extent_block *) eb_bh->b_data; - el = &eb->h_list; - - if (el->l_tree_depth) { - ocfs2_error(sb, - "refcount tree %llu has non zero tree " - "depth in leaf btree tree block %llu\n", - (unsigned long long)ocfs2_metadata_cache_owner(ci), - (unsigned long long)eb_bh->b_blocknr); - ret = -EROFS; - goto out; - } - } - - found = 0; - for (i = le16_to_cpu(el->l_next_free_rec) - 1; i >= 0; i--) { - rec = &el->l_recs[i]; - - if (le32_to_cpu(rec->e_cpos) <= low_cpos) { - found = 1; - break; - } - } - - if (found) { - ret = ocfs2_get_refcount_cpos_end(ci, ref_root_bh, - eb, el, i, &cpos_end); - if (ret) { - mlog_errno(ret); - goto out; - } - - if (cpos_end < low_cpos + len) - len = cpos_end - low_cpos; - } - - ret = ocfs2_read_refcount_block(ci, le64_to_cpu(rec->e_blkno), - &ref_leaf_bh); - if (ret) { - mlog_errno(ret); - goto out; - } - - ocfs2_find_refcount_rec_in_rl(ci, ref_leaf_bh, cpos, len, - ret_rec, index); - *ret_bh = ref_leaf_bh; -out: - brelse(eb_bh); - return ret; -} - -enum ocfs2_ref_rec_contig { - REF_CONTIG_NONE = 0, - REF_CONTIG_LEFT, - REF_CONTIG_RIGHT, - REF_CONTIG_LEFTRIGHT, -}; - -static enum ocfs2_ref_rec_contig - ocfs2_refcount_rec_adjacent(struct ocfs2_refcount_block *rb, - int index) -{ - if ((rb->rf_records.rl_recs[index].r_refcount == - rb->rf_records.rl_recs[index + 1].r_refcount) && - (le64_to_cpu(rb->rf_records.rl_recs[index].r_cpos) + - le32_to_cpu(rb->rf_records.rl_recs[index].r_clusters) == - le64_to_cpu(rb->rf_records.rl_recs[index + 1].r_cpos))) - return REF_CONTIG_RIGHT; - - return REF_CONTIG_NONE; -} - -static enum ocfs2_ref_rec_contig - ocfs2_refcount_rec_contig(struct ocfs2_refcount_block *rb, - int index) -{ - enum ocfs2_ref_rec_contig ret = REF_CONTIG_NONE; - - if (index < le16_to_cpu(rb->rf_records.rl_used) - 1) - ret = ocfs2_refcount_rec_adjacent(rb, index); - - if (index > 0) { - enum ocfs2_ref_rec_contig tmp; - - tmp = ocfs2_refcount_rec_adjacent(rb, index - 1); - - if (tmp == REF_CONTIG_RIGHT) { - if (ret == REF_CONTIG_RIGHT) - ret = REF_CONTIG_LEFTRIGHT; - else - ret = REF_CONTIG_LEFT; - } - } - - return ret; -} - -static void ocfs2_rotate_refcount_rec_left(struct ocfs2_refcount_block *rb, - int index) -{ - BUG_ON(rb->rf_records.rl_recs[index].r_refcount != - rb->rf_records.rl_recs[index+1].r_refcount); - - le32_add_cpu(&rb->rf_records.rl_recs[index].r_clusters, - le32_to_cpu(rb->rf_records.rl_recs[index+1].r_clusters)); - - if (index < le16_to_cpu(rb->rf_records.rl_used) - 2) - memmove(&rb->rf_records.rl_recs[index + 1], - &rb->rf_records.rl_recs[index + 2], - sizeof(struct ocfs2_refcount_rec) * - (le16_to_cpu(rb->rf_records.rl_used) - index - 2)); - - memset(&rb->rf_records.rl_recs[le16_to_cpu(rb->rf_records.rl_used) - 1], - 0, sizeof(struct ocfs2_refcount_rec)); - le16_add_cpu(&rb->rf_records.rl_used, -1); -} - -/* - * Merge the refcount rec if we are contiguous with the adjacent recs. - */ -static void ocfs2_refcount_rec_merge(struct ocfs2_refcount_block *rb, - int index) -{ - enum ocfs2_ref_rec_contig contig = - ocfs2_refcount_rec_contig(rb, index); - - if (contig == REF_CONTIG_NONE) - return; - - if (contig == REF_CONTIG_LEFT || contig == REF_CONTIG_LEFTRIGHT) { - BUG_ON(index == 0); - index--; - } - - ocfs2_rotate_refcount_rec_left(rb, index); - - if (contig == REF_CONTIG_LEFTRIGHT) - ocfs2_rotate_refcount_rec_left(rb, index); -} - -/* - * Change the refcount indexed by "index" in ref_bh. - * If refcount reaches 0, remove it. - */ -static int ocfs2_change_refcount_rec(handle_t *handle, - struct ocfs2_caching_info *ci, - struct buffer_head *ref_leaf_bh, - int index, int merge, int change) -{ - int ret; - struct ocfs2_refcount_block *rb = - (struct ocfs2_refcount_block *)ref_leaf_bh->b_data; - struct ocfs2_refcount_list *rl = &rb->rf_records; - struct ocfs2_refcount_rec *rec = &rl->rl_recs[index]; - - ret = ocfs2_journal_access_rb(handle, ci, ref_leaf_bh, - OCFS2_JOURNAL_ACCESS_WRITE); - if (ret) { - mlog_errno(ret); - goto out; - } - - trace_ocfs2_change_refcount_rec( - (unsigned long long)ocfs2_metadata_cache_owner(ci), - index, le32_to_cpu(rec->r_refcount), change); - le32_add_cpu(&rec->r_refcount, change); - - if (!rec->r_refcount) { - if (index != le16_to_cpu(rl->rl_used) - 1) { - memmove(rec, rec + 1, - (le16_to_cpu(rl->rl_used) - index - 1) * - sizeof(struct ocfs2_refcount_rec)); - memset(&rl->rl_recs[le16_to_cpu(rl->rl_used) - 1], - 0, sizeof(struct ocfs2_refcount_rec)); - } - - le16_add_cpu(&rl->rl_used, -1); - } else if (merge) - ocfs2_refcount_rec_merge(rb, index); - - ocfs2_journal_dirty(handle, ref_leaf_bh); -out: - return ret; -} - -static int ocfs2_expand_inline_ref_root(handle_t *handle, - struct ocfs2_caching_info *ci, - struct buffer_head *ref_root_bh, - struct buffer_head **ref_leaf_bh, - struct ocfs2_alloc_context *meta_ac) -{ - int ret; - u16 suballoc_bit_start; - u32 num_got; - u64 suballoc_loc, blkno; - struct super_block *sb = ocfs2_metadata_cache_get_super(ci); - struct buffer_head *new_bh = NULL; - struct ocfs2_refcount_block *new_rb; - struct ocfs2_refcount_block *root_rb = - (struct ocfs2_refcount_block *)ref_root_bh->b_data; - - ret = ocfs2_journal_access_rb(handle, ci, ref_root_bh, - OCFS2_JOURNAL_ACCESS_WRITE); - if (ret) { - mlog_errno(ret); - goto out; - } - - ret = ocfs2_claim_metadata(handle, meta_ac, 1, &suballoc_loc, - &suballoc_bit_start, &num_got, - &blkno); - if (ret) { - mlog_errno(ret); - goto out; - } - - new_bh = sb_getblk(sb, blkno); - if (new_bh == NULL) { - ret = -EIO; - mlog_errno(ret); - goto out; - } - ocfs2_set_new_buffer_uptodate(ci, new_bh); - - ret = ocfs2_journal_access_rb(handle, ci, new_bh, - OCFS2_JOURNAL_ACCESS_CREATE); - if (ret) { - mlog_errno(ret); - goto out; - } - - /* - * Initialize ocfs2_refcount_block. - * It should contain the same information as the old root. - * so just memcpy it and change the corresponding field. - */ - memcpy(new_bh->b_data, ref_root_bh->b_data, sb->s_blocksize); - - new_rb = (struct ocfs2_refcount_block *)new_bh->b_data; - new_rb->rf_suballoc_slot = cpu_to_le16(meta_ac->ac_alloc_slot); - new_rb->rf_suballoc_loc = cpu_to_le64(suballoc_loc); - new_rb->rf_suballoc_bit = cpu_to_le16(suballoc_bit_start); - new_rb->rf_blkno = cpu_to_le64(blkno); - new_rb->rf_cpos = cpu_to_le32(0); - new_rb->rf_parent = cpu_to_le64(ref_root_bh->b_blocknr); - new_rb->rf_flags = cpu_to_le32(OCFS2_REFCOUNT_LEAF_FL); - ocfs2_journal_dirty(handle, new_bh); - - /* Now change the root. */ - memset(&root_rb->rf_list, 0, sb->s_blocksize - - offsetof(struct ocfs2_refcount_block, rf_list)); - root_rb->rf_list.l_count = cpu_to_le16(ocfs2_extent_recs_per_rb(sb)); - root_rb->rf_clusters = cpu_to_le32(1); - root_rb->rf_list.l_next_free_rec = cpu_to_le16(1); - root_rb->rf_list.l_recs[0].e_blkno = cpu_to_le64(blkno); - root_rb->rf_list.l_recs[0].e_leaf_clusters = cpu_to_le16(1); - root_rb->rf_flags = cpu_to_le32(OCFS2_REFCOUNT_TREE_FL); - - ocfs2_journal_dirty(handle, ref_root_bh); - - trace_ocfs2_expand_inline_ref_root((unsigned long long)blkno, - le16_to_cpu(new_rb->rf_records.rl_used)); - - *ref_leaf_bh = new_bh; - new_bh = NULL; -out: - brelse(new_bh); - return ret; -} - -static int ocfs2_refcount_rec_no_intersect(struct ocfs2_refcount_rec *prev, - struct ocfs2_refcount_rec *next) -{ - if (ocfs2_get_ref_rec_low_cpos(prev) + le32_to_cpu(prev->r_clusters) <= - ocfs2_get_ref_rec_low_cpos(next)) - return 1; - - return 0; -} - -static int cmp_refcount_rec_by_low_cpos(const void *a, const void *b) -{ - const struct ocfs2_refcount_rec *l = a, *r = b; - u32 l_cpos = ocfs2_get_ref_rec_low_cpos(l); - u32 r_cpos = ocfs2_get_ref_rec_low_cpos(r); - - if (l_cpos > r_cpos) - return 1; - if (l_cpos < r_cpos) - return -1; - return 0; -} - -static int cmp_refcount_rec_by_cpos(const void *a, const void *b) -{ - const struct ocfs2_refcount_rec *l = a, *r = b; - u64 l_cpos = le64_to_cpu(l->r_cpos); - u64 r_cpos = le64_to_cpu(r->r_cpos); - - if (l_cpos > r_cpos) - return 1; - if (l_cpos < r_cpos) - return -1; - return 0; -} - -static void swap_refcount_rec(void *a, void *b, int size) -{ - struct ocfs2_refcount_rec *l = a, *r = b, tmp; - - tmp = *(struct ocfs2_refcount_rec *)l; - *(struct ocfs2_refcount_rec *)l = - *(struct ocfs2_refcount_rec *)r; - *(struct ocfs2_refcount_rec *)r = tmp; -} - -/* - * The refcount cpos are ordered by their 64bit cpos, - * But we will use the low 32 bit to be the e_cpos in the b-tree. - * So we need to make sure that this pos isn't intersected with others. - * - * Note: The refcount block is already sorted by their low 32 bit cpos, - * So just try the middle pos first, and we will exit when we find - * the good position. - */ -static int ocfs2_find_refcount_split_pos(struct ocfs2_refcount_list *rl, - u32 *split_pos, int *split_index) -{ - int num_used = le16_to_cpu(rl->rl_used); - int delta, middle = num_used / 2; - - for (delta = 0; delta < middle; delta++) { - /* Let's check delta earlier than middle */ - if (ocfs2_refcount_rec_no_intersect( - &rl->rl_recs[middle - delta - 1], - &rl->rl_recs[middle - delta])) { - *split_index = middle - delta; - break; - } - - /* For even counts, don't walk off the end */ - if ((middle + delta + 1) == num_used) - continue; - - /* Now try delta past middle */ - if (ocfs2_refcount_rec_no_intersect( - &rl->rl_recs[middle + delta], - &rl->rl_recs[middle + delta + 1])) { - *split_index = middle + delta + 1; - break; - } - } - - if (delta >= middle) - return -ENOSPC; - - *split_pos = ocfs2_get_ref_rec_low_cpos(&rl->rl_recs[*split_index]); - return 0; -} - -static int ocfs2_divide_leaf_refcount_block(struct buffer_head *ref_leaf_bh, - struct buffer_head *new_bh, - u32 *split_cpos) -{ - int split_index = 0, num_moved, ret; - u32 cpos = 0; - struct ocfs2_refcount_block *rb = - (struct ocfs2_refcount_block *)ref_leaf_bh->b_data; - struct ocfs2_refcount_list *rl = &rb->rf_records; - struct ocfs2_refcount_block *new_rb = - (struct ocfs2_refcount_block *)new_bh->b_data; - struct ocfs2_refcount_list *new_rl = &new_rb->rf_records; - - trace_ocfs2_divide_leaf_refcount_block( - (unsigned long long)ref_leaf_bh->b_blocknr, - le16_to_cpu(rl->rl_count), le16_to_cpu(rl->rl_used)); - - /* - * XXX: Improvement later. - * If we know all the high 32 bit cpos is the same, no need to sort. - * - * In order to make the whole process safe, we do: - * 1. sort the entries by their low 32 bit cpos first so that we can - * find the split cpos easily. - * 2. call ocfs2_insert_extent to insert the new refcount block. - * 3. move the refcount rec to the new block. - * 4. sort the entries by their 64 bit cpos. - * 5. dirty the new_rb and rb. - */ - sort(&rl->rl_recs, le16_to_cpu(rl->rl_used), - sizeof(struct ocfs2_refcount_rec), - cmp_refcount_rec_by_low_cpos, swap_refcount_rec); - - ret = ocfs2_find_refcount_split_pos(rl, &cpos, &split_index); - if (ret) { - mlog_errno(ret); - return ret; - } - - new_rb->rf_cpos = cpu_to_le32(cpos); - - /* move refcount records starting from split_index to the new block. */ - num_moved = le16_to_cpu(rl->rl_used) - split_index; - memcpy(new_rl->rl_recs, &rl->rl_recs[split_index], - num_moved * sizeof(struct ocfs2_refcount_rec)); - - /*ok, remove the entries we just moved over to the other block. */ - memset(&rl->rl_recs[split_index], 0, - num_moved * sizeof(struct ocfs2_refcount_rec)); - - /* change old and new rl_used accordingly. */ - le16_add_cpu(&rl->rl_used, -num_moved); - new_rl->rl_used = cpu_to_le16(num_moved); - - sort(&rl->rl_recs, le16_to_cpu(rl->rl_used), - sizeof(struct ocfs2_refcount_rec), - cmp_refcount_rec_by_cpos, swap_refcount_rec); - - sort(&new_rl->rl_recs, le16_to_cpu(new_rl->rl_used), - sizeof(struct ocfs2_refcount_rec), - cmp_refcount_rec_by_cpos, swap_refcount_rec); - - *split_cpos = cpos; - return 0; -} - -static int ocfs2_new_leaf_refcount_block(handle_t *handle, - struct ocfs2_caching_info *ci, - struct buffer_head *ref_root_bh, - struct buffer_head *ref_leaf_bh, - struct ocfs2_alloc_context *meta_ac) -{ - int ret; - u16 suballoc_bit_start; - u32 num_got, new_cpos; - u64 suballoc_loc, blkno; - struct super_block *sb = ocfs2_metadata_cache_get_super(ci); - struct ocfs2_refcount_block *root_rb = - (struct ocfs2_refcount_block *)ref_root_bh->b_data; - struct buffer_head *new_bh = NULL; - struct ocfs2_refcount_block *new_rb; - struct ocfs2_extent_tree ref_et; - - BUG_ON(!(le32_to_cpu(root_rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL)); - - ret = ocfs2_journal_access_rb(handle, ci, ref_root_bh, - OCFS2_JOURNAL_ACCESS_WRITE); - if (ret) { - mlog_errno(ret); - goto out; - } - - ret = ocfs2_journal_access_rb(handle, ci, ref_leaf_bh, - OCFS2_JOURNAL_ACCESS_WRITE); - if (ret) { - mlog_errno(ret); - goto out; - } - - ret = ocfs2_claim_metadata(handle, meta_ac, 1, &suballoc_loc, - &suballoc_bit_start, &num_got, - &blkno); - if (ret) { - mlog_errno(ret); - goto out; - } - - new_bh = sb_getblk(sb, blkno); - if (new_bh == NULL) { - ret = -EIO; - mlog_errno(ret); - goto out; - } - ocfs2_set_new_buffer_uptodate(ci, new_bh); - - ret = ocfs2_journal_access_rb(handle, ci, new_bh, - OCFS2_JOURNAL_ACCESS_CREATE); - if (ret) { - mlog_errno(ret); - goto out; - } - - /* Initialize ocfs2_refcount_block. */ - new_rb = (struct ocfs2_refcount_block *)new_bh->b_data; - memset(new_rb, 0, sb->s_blocksize); - strcpy((void *)new_rb, OCFS2_REFCOUNT_BLOCK_SIGNATURE); - new_rb->rf_suballoc_slot = cpu_to_le16(meta_ac->ac_alloc_slot); - new_rb->rf_suballoc_loc = cpu_to_le64(suballoc_loc); - new_rb->rf_suballoc_bit = cpu_to_le16(suballoc_bit_start); - new_rb->rf_fs_generation = cpu_to_le32(OCFS2_SB(sb)->fs_generation); - new_rb->rf_blkno = cpu_to_le64(blkno); - new_rb->rf_parent = cpu_to_le64(ref_root_bh->b_blocknr); - new_rb->rf_flags = cpu_to_le32(OCFS2_REFCOUNT_LEAF_FL); - new_rb->rf_records.rl_count = - cpu_to_le16(ocfs2_refcount_recs_per_rb(sb)); - new_rb->rf_generation = root_rb->rf_generation; - - ret = ocfs2_divide_leaf_refcount_block(ref_leaf_bh, new_bh, &new_cpos); - if (ret) { - mlog_errno(ret); - goto out; - } - - ocfs2_journal_dirty(handle, ref_leaf_bh); - ocfs2_journal_dirty(handle, new_bh); - - ocfs2_init_refcount_extent_tree(&ref_et, ci, ref_root_bh); - - trace_ocfs2_new_leaf_refcount_block( - (unsigned long long)new_bh->b_blocknr, new_cpos); - - /* Insert the new leaf block with the specific offset cpos. */ - ret = ocfs2_insert_extent(handle, &ref_et, new_cpos, new_bh->b_blocknr, - 1, 0, meta_ac); - if (ret) - mlog_errno(ret); - -out: - brelse(new_bh); - return ret; -} - -static int ocfs2_expand_refcount_tree(handle_t *handle, - struct ocfs2_caching_info *ci, - struct buffer_head *ref_root_bh, - struct buffer_head *ref_leaf_bh, - struct ocfs2_alloc_context *meta_ac) -{ - int ret; - struct buffer_head *expand_bh = NULL; - - if (ref_root_bh == ref_leaf_bh) { - /* - * the old root bh hasn't been expanded to a b-tree, - * so expand it first. - */ - ret = ocfs2_expand_inline_ref_root(handle, ci, ref_root_bh, - &expand_bh, meta_ac); - if (ret) { - mlog_errno(ret); - goto out; - } - } else { - expand_bh = ref_leaf_bh; - get_bh(expand_bh); - } - - - /* Now add a new refcount block into the tree.*/ - ret = ocfs2_new_leaf_refcount_block(handle, ci, ref_root_bh, - expand_bh, meta_ac); - if (ret) - mlog_errno(ret); -out: - brelse(expand_bh); - return ret; -} - -/* - * Adjust the extent rec in b-tree representing ref_leaf_bh. - * - * Only called when we have inserted a new refcount rec at index 0 - * which means ocfs2_extent_rec.e_cpos may need some change. - */ -static int ocfs2_adjust_refcount_rec(handle_t *handle, - struct ocfs2_caching_info *ci, - struct buffer_head *ref_root_bh, - struct buffer_head *ref_leaf_bh, - struct ocfs2_refcount_rec *rec) -{ - int ret = 0, i; - u32 new_cpos, old_cpos; - struct ocfs2_path *path = NULL; - struct ocfs2_extent_tree et; - struct ocfs2_refcount_block *rb = - (struct ocfs2_refcount_block *)ref_root_bh->b_data; - struct ocfs2_extent_list *el; - - if (!(le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL)) - goto out; - - rb = (struct ocfs2_refcount_block *)ref_leaf_bh->b_data; - old_cpos = le32_to_cpu(rb->rf_cpos); - new_cpos = le64_to_cpu(rec->r_cpos) & OCFS2_32BIT_POS_MASK; - if (old_cpos <= new_cpos) - goto out; - - ocfs2_init_refcount_extent_tree(&et, ci, ref_root_bh); - - path = ocfs2_new_path_from_et(&et); - if (!path) { - ret = -ENOMEM; - mlog_errno(ret); - goto out; - } - - ret = ocfs2_find_path(ci, path, old_cpos); - if (ret) { - mlog_errno(ret); - goto out; - } - - /* - * 2 more credits, one for the leaf refcount block, one for - * the extent block contains the extent rec. - */ - ret = ocfs2_extend_trans(handle, 2); - if (ret < 0) { - mlog_errno(ret); - goto out; - } - - ret = ocfs2_journal_access_rb(handle, ci, ref_leaf_bh, - OCFS2_JOURNAL_ACCESS_WRITE); - if (ret < 0) { - mlog_errno(ret); - goto out; - } - - ret = ocfs2_journal_access_eb(handle, ci, path_leaf_bh(path), - OCFS2_JOURNAL_ACCESS_WRITE); - if (ret < 0) { - mlog_errno(ret); - goto out; - } - - /* change the leaf extent block first. */ - el = path_leaf_el(path); - - for (i = 0; i < le16_to_cpu(el->l_next_free_rec); i++) - if (le32_to_cpu(el->l_recs[i].e_cpos) == old_cpos) - break; - - BUG_ON(i == le16_to_cpu(el->l_next_free_rec)); - - el->l_recs[i].e_cpos = cpu_to_le32(new_cpos); - - /* change the r_cpos in the leaf block. */ - rb->rf_cpos = cpu_to_le32(new_cpos); - - ocfs2_journal_dirty(handle, path_leaf_bh(path)); - ocfs2_journal_dirty(handle, ref_leaf_bh); - -out: - ocfs2_free_path(path); - return ret; -} - -static int ocfs2_insert_refcount_rec(handle_t *handle, - struct ocfs2_caching_info *ci, - struct buffer_head *ref_root_bh, - struct buffer_head *ref_leaf_bh, - struct ocfs2_refcount_rec *rec, - int index, int merge, - struct ocfs2_alloc_context *meta_ac) -{ - int ret; - struct ocfs2_refcount_block *rb = - (struct ocfs2_refcount_block *)ref_leaf_bh->b_data; - struct ocfs2_refcount_list *rf_list = &rb->rf_records; - struct buffer_head *new_bh = NULL; - - BUG_ON(le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL); - - if (rf_list->rl_used == rf_list->rl_count) { - u64 cpos = le64_to_cpu(rec->r_cpos); - u32 len = le32_to_cpu(rec->r_clusters); - - ret = ocfs2_expand_refcount_tree(handle, ci, ref_root_bh, - ref_leaf_bh, meta_ac); - if (ret) { - mlog_errno(ret); - goto out; - } - - ret = ocfs2_get_refcount_rec(ci, ref_root_bh, - cpos, len, NULL, &index, - &new_bh); - if (ret) { - mlog_errno(ret); - goto out; - } - - ref_leaf_bh = new_bh; - rb = (struct ocfs2_refcount_block *)ref_leaf_bh->b_data; - rf_list = &rb->rf_records; - } - - ret = ocfs2_journal_access_rb(handle, ci, ref_leaf_bh, - OCFS2_JOURNAL_ACCESS_WRITE); - if (ret) { - mlog_errno(ret); - goto out; - } - - if (index < le16_to_cpu(rf_list->rl_used)) - memmove(&rf_list->rl_recs[index + 1], - &rf_list->rl_recs[index], - (le16_to_cpu(rf_list->rl_used) - index) * - sizeof(struct ocfs2_refcount_rec)); - - trace_ocfs2_insert_refcount_rec( - (unsigned long long)ref_leaf_bh->b_blocknr, index, - (unsigned long long)le64_to_cpu(rec->r_cpos), - le32_to_cpu(rec->r_clusters), le32_to_cpu(rec->r_refcount)); - - rf_list->rl_recs[index] = *rec; - - le16_add_cpu(&rf_list->rl_used, 1); - - if (merge) - ocfs2_refcount_rec_merge(rb, index); - - ocfs2_journal_dirty(handle, ref_leaf_bh); - - if (index == 0) { - ret = ocfs2_adjust_refcount_rec(handle, ci, - ref_root_bh, - ref_leaf_bh, rec); - if (ret) - mlog_errno(ret); - } -out: - brelse(new_bh); - return ret; -} - -/* - * Split the refcount_rec indexed by "index" in ref_leaf_bh. - * This is much simple than our b-tree code. - * split_rec is the new refcount rec we want to insert. - * If split_rec->r_refcount > 0, we are changing the refcount(in case we - * increase refcount or decrease a refcount to non-zero). - * If split_rec->r_refcount == 0, we are punching a hole in current refcount - * rec( in case we decrease a refcount to zero). - */ -static int ocfs2_split_refcount_rec(handle_t *handle, - struct ocfs2_caching_info *ci, - struct buffer_head *ref_root_bh, - struct buffer_head *ref_leaf_bh, - struct ocfs2_refcount_rec *split_rec, - int index, int merge, - struct ocfs2_alloc_context *meta_ac, - struct ocfs2_cached_dealloc_ctxt *dealloc) -{ - int ret, recs_need; - u32 len; - struct ocfs2_refcount_block *rb = - (struct ocfs2_refcount_block *)ref_leaf_bh->b_data; - struct ocfs2_refcount_list *rf_list = &rb->rf_records; - struct ocfs2_refcount_rec *orig_rec = &rf_list->rl_recs[index]; - struct ocfs2_refcount_rec *tail_rec = NULL; - struct buffer_head *new_bh = NULL; - - BUG_ON(le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL); - - trace_ocfs2_split_refcount_rec(le64_to_cpu(orig_rec->r_cpos), - le32_to_cpu(orig_rec->r_clusters), - le32_to_cpu(orig_rec->r_refcount), - le64_to_cpu(split_rec->r_cpos), - le32_to_cpu(split_rec->r_clusters), - le32_to_cpu(split_rec->r_refcount)); - - /* - * If we just need to split the header or tail clusters, - * no more recs are needed, just split is OK. - * Otherwise we at least need one new recs. - */ - if (!split_rec->r_refcount && - (split_rec->r_cpos == orig_rec->r_cpos || - le64_to_cpu(split_rec->r_cpos) + - le32_to_cpu(split_rec->r_clusters) == - le64_to_cpu(orig_rec->r_cpos) + le32_to_cpu(orig_rec->r_clusters))) - recs_need = 0; - else - recs_need = 1; - - /* - * We need one more rec if we split in the middle and the new rec have - * some refcount in it. - */ - if (split_rec->r_refcount && - (split_rec->r_cpos != orig_rec->r_cpos && - le64_to_cpu(split_rec->r_cpos) + - le32_to_cpu(split_rec->r_clusters) != - le64_to_cpu(orig_rec->r_cpos) + le32_to_cpu(orig_rec->r_clusters))) - recs_need++; - - /* If the leaf block don't have enough record, expand it. */ - if (le16_to_cpu(rf_list->rl_used) + recs_need > - le16_to_cpu(rf_list->rl_count)) { - struct ocfs2_refcount_rec tmp_rec; - u64 cpos = le64_to_cpu(orig_rec->r_cpos); - len = le32_to_cpu(orig_rec->r_clusters); - ret = ocfs2_expand_refcount_tree(handle, ci, ref_root_bh, - ref_leaf_bh, meta_ac); - if (ret) { - mlog_errno(ret); - goto out; - } - - /* - * We have to re-get it since now cpos may be moved to - * another leaf block. - */ - ret = ocfs2_get_refcount_rec(ci, ref_root_bh, - cpos, len, &tmp_rec, &index, - &new_bh); - if (ret) { - mlog_errno(ret); - goto out; - } - - ref_leaf_bh = new_bh; - rb = (struct ocfs2_refcount_block *)ref_leaf_bh->b_data; - rf_list = &rb->rf_records; - orig_rec = &rf_list->rl_recs[index]; - } - - ret = ocfs2_journal_access_rb(handle, ci, ref_leaf_bh, - OCFS2_JOURNAL_ACCESS_WRITE); - if (ret) { - mlog_errno(ret); - goto out; - } - - /* - * We have calculated out how many new records we need and store - * in recs_need, so spare enough space first by moving the records - * after "index" to the end. - */ - if (index != le16_to_cpu(rf_list->rl_used) - 1) - memmove(&rf_list->rl_recs[index + 1 + recs_need], - &rf_list->rl_recs[index + 1], - (le16_to_cpu(rf_list->rl_used) - index - 1) * - sizeof(struct ocfs2_refcount_rec)); - - len = (le64_to_cpu(orig_rec->r_cpos) + - le32_to_cpu(orig_rec->r_clusters)) - - (le64_to_cpu(split_rec->r_cpos) + - le32_to_cpu(split_rec->r_clusters)); - - /* - * If we have "len", the we will split in the tail and move it - * to the end of the space we have just spared. - */ - if (len) { - tail_rec = &rf_list->rl_recs[index + recs_need]; - - memcpy(tail_rec, orig_rec, sizeof(struct ocfs2_refcount_rec)); - le64_add_cpu(&tail_rec->r_cpos, - le32_to_cpu(tail_rec->r_clusters) - len); - tail_rec->r_clusters = cpu_to_le32(len); - } - - /* - * If the split pos isn't the same as the original one, we need to - * split in the head. - * - * Note: We have the chance that split_rec.r_refcount = 0, - * recs_need = 0 and len > 0, which means we just cut the head from - * the orig_rec and in that case we have done some modification in - * orig_rec above, so the check for r_cpos is faked. - */ - if (split_rec->r_cpos != orig_rec->r_cpos && tail_rec != orig_rec) { - len = le64_to_cpu(split_rec->r_cpos) - - le64_to_cpu(orig_rec->r_cpos); - orig_rec->r_clusters = cpu_to_le32(len); - index++; - } - - le16_add_cpu(&rf_list->rl_used, recs_need); - - if (split_rec->r_refcount) { - rf_list->rl_recs[index] = *split_rec; - trace_ocfs2_split_refcount_rec_insert( - (unsigned long long)ref_leaf_bh->b_blocknr, index, - (unsigned long long)le64_to_cpu(split_rec->r_cpos), - le32_to_cpu(split_rec->r_clusters), - le32_to_cpu(split_rec->r_refcount)); - - if (merge) - ocfs2_refcount_rec_merge(rb, index); - } - - ocfs2_journal_dirty(handle, ref_leaf_bh); - -out: - brelse(new_bh); - return ret; -} - -static int __ocfs2_increase_refcount(handle_t *handle, - struct ocfs2_caching_info *ci, - struct buffer_head *ref_root_bh, - u64 cpos, u32 len, int merge, - struct ocfs2_alloc_context *meta_ac, - struct ocfs2_cached_dealloc_ctxt *dealloc) -{ - int ret = 0, index; - struct buffer_head *ref_leaf_bh = NULL; - struct ocfs2_refcount_rec rec; - unsigned int set_len = 0; - - trace_ocfs2_increase_refcount_begin( - (unsigned long long)ocfs2_metadata_cache_owner(ci), - (unsigned long long)cpos, len); - - while (len) { - ret = ocfs2_get_refcount_rec(ci, ref_root_bh, - cpos, len, &rec, &index, - &ref_leaf_bh); - if (ret) { - mlog_errno(ret); - goto out; - } - - set_len = le32_to_cpu(rec.r_clusters); - - /* - * Here we may meet with 3 situations: - * - * 1. If we find an already existing record, and the length - * is the same, cool, we just need to increase the r_refcount - * and it is OK. - * 2. If we find a hole, just insert it with r_refcount = 1. - * 3. If we are in the middle of one extent record, split - * it. - */ - if (rec.r_refcount && le64_to_cpu(rec.r_cpos) == cpos && - set_len <= len) { - trace_ocfs2_increase_refcount_change( - (unsigned long long)cpos, set_len, - le32_to_cpu(rec.r_refcount)); - ret = ocfs2_change_refcount_rec(handle, ci, - ref_leaf_bh, index, - merge, 1); - if (ret) { - mlog_errno(ret); - goto out; - } - } else if (!rec.r_refcount) { - rec.r_refcount = cpu_to_le32(1); - - trace_ocfs2_increase_refcount_insert( - (unsigned long long)le64_to_cpu(rec.r_cpos), - set_len); - ret = ocfs2_insert_refcount_rec(handle, ci, ref_root_bh, - ref_leaf_bh, - &rec, index, - merge, meta_ac); - if (ret) { - mlog_errno(ret); - goto out; - } - } else { - set_len = min((u64)(cpos + len), - le64_to_cpu(rec.r_cpos) + set_len) - cpos; - rec.r_cpos = cpu_to_le64(cpos); - rec.r_clusters = cpu_to_le32(set_len); - le32_add_cpu(&rec.r_refcount, 1); - - trace_ocfs2_increase_refcount_split( - (unsigned long long)le64_to_cpu(rec.r_cpos), - set_len, le32_to_cpu(rec.r_refcount)); - ret = ocfs2_split_refcount_rec(handle, ci, - ref_root_bh, ref_leaf_bh, - &rec, index, merge, - meta_ac, dealloc); - if (ret) { - mlog_errno(ret); - goto out; - } - } - - cpos += set_len; - len -= set_len; - brelse(ref_leaf_bh); - ref_leaf_bh = NULL; - } - -out: - brelse(ref_leaf_bh); - return ret; -} - -static int ocfs2_remove_refcount_extent(handle_t *handle, - struct ocfs2_caching_info *ci, - struct buffer_head *ref_root_bh, - struct buffer_head *ref_leaf_bh, - struct ocfs2_alloc_context *meta_ac, - struct ocfs2_cached_dealloc_ctxt *dealloc) -{ - int ret; - struct super_block *sb = ocfs2_metadata_cache_get_super(ci); - struct ocfs2_refcount_block *rb = - (struct ocfs2_refcount_block *)ref_leaf_bh->b_data; - struct ocfs2_extent_tree et; - - BUG_ON(rb->rf_records.rl_used); - - trace_ocfs2_remove_refcount_extent( - (unsigned long long)ocfs2_metadata_cache_owner(ci), - (unsigned long long)ref_leaf_bh->b_blocknr, - le32_to_cpu(rb->rf_cpos)); - - ocfs2_init_refcount_extent_tree(&et, ci, ref_root_bh); - ret = ocfs2_remove_extent(handle, &et, le32_to_cpu(rb->rf_cpos), - 1, meta_ac, dealloc); - if (ret) { - mlog_errno(ret); - goto out; - } - - ocfs2_remove_from_cache(ci, ref_leaf_bh); - - /* - * add the freed block to the dealloc so that it will be freed - * when we run dealloc. - */ - ret = ocfs2_cache_block_dealloc(dealloc, EXTENT_ALLOC_SYSTEM_INODE, - le16_to_cpu(rb->rf_suballoc_slot), - le64_to_cpu(rb->rf_suballoc_loc), - le64_to_cpu(rb->rf_blkno), - le16_to_cpu(rb->rf_suballoc_bit)); - if (ret) { - mlog_errno(ret); - goto out; - } - - ret = ocfs2_journal_access_rb(handle, ci, ref_root_bh, - OCFS2_JOURNAL_ACCESS_WRITE); - if (ret) { - mlog_errno(ret); - goto out; - } - - rb = (struct ocfs2_refcount_block *)ref_root_bh->b_data; - - le32_add_cpu(&rb->rf_clusters, -1); - - /* - * check whether we need to restore the root refcount block if - * there is no leaf extent block at atll. - */ - if (!rb->rf_list.l_next_free_rec) { - BUG_ON(rb->rf_clusters); - - trace_ocfs2_restore_refcount_block( - (unsigned long long)ref_root_bh->b_blocknr); - - rb->rf_flags = 0; - rb->rf_parent = 0; - rb->rf_cpos = 0; - memset(&rb->rf_records, 0, sb->s_blocksize - - offsetof(struct ocfs2_refcount_block, rf_records)); - rb->rf_records.rl_count = - cpu_to_le16(ocfs2_refcount_recs_per_rb(sb)); - } - - ocfs2_journal_dirty(handle, ref_root_bh); - -out: - return ret; -} - -int ocfs2_increase_refcount(handle_t *handle, - struct ocfs2_caching_info *ci, - struct buffer_head *ref_root_bh, - u64 cpos, u32 len, - struct ocfs2_alloc_context *meta_ac, - struct ocfs2_cached_dealloc_ctxt *dealloc) -{ - return __ocfs2_increase_refcount(handle, ci, ref_root_bh, - cpos, len, 1, - meta_ac, dealloc); -} - -static int ocfs2_decrease_refcount_rec(handle_t *handle, - struct ocfs2_caching_info *ci, - struct buffer_head *ref_root_bh, - struct buffer_head *ref_leaf_bh, - int index, u64 cpos, unsigned int len, - struct ocfs2_alloc_context *meta_ac, - struct ocfs2_cached_dealloc_ctxt *dealloc) -{ - int ret; - struct ocfs2_refcount_block *rb = - (struct ocfs2_refcount_block *)ref_leaf_bh->b_data; - struct ocfs2_refcount_rec *rec = &rb->rf_records.rl_recs[index]; - - BUG_ON(cpos < le64_to_cpu(rec->r_cpos)); - BUG_ON(cpos + len > - le64_to_cpu(rec->r_cpos) + le32_to_cpu(rec->r_clusters)); - - trace_ocfs2_decrease_refcount_rec( - (unsigned long long)ocfs2_metadata_cache_owner(ci), - (unsigned long long)cpos, len); - - if (cpos == le64_to_cpu(rec->r_cpos) && - len == le32_to_cpu(rec->r_clusters)) - ret = ocfs2_change_refcount_rec(handle, ci, - ref_leaf_bh, index, 1, -1); - else { - struct ocfs2_refcount_rec split = *rec; - split.r_cpos = cpu_to_le64(cpos); - split.r_clusters = cpu_to_le32(len); - - le32_add_cpu(&split.r_refcount, -1); - - ret = ocfs2_split_refcount_rec(handle, ci, - ref_root_bh, ref_leaf_bh, - &split, index, 1, - meta_ac, dealloc); - } - - if (ret) { - mlog_errno(ret); - goto out; - } - - /* Remove the leaf refcount block if it contains no refcount record. */ - if (!rb->rf_records.rl_used && ref_leaf_bh != ref_root_bh) { - ret = ocfs2_remove_refcount_extent(handle, ci, ref_root_bh, - ref_leaf_bh, meta_ac, - dealloc); - if (ret) - mlog_errno(ret); - } - -out: - return ret; -} - -static int __ocfs2_decrease_refcount(handle_t *handle, - struct ocfs2_caching_info *ci, - struct buffer_head *ref_root_bh, - u64 cpos, u32 len, - struct ocfs2_alloc_context *meta_ac, - struct ocfs2_cached_dealloc_ctxt *dealloc, - int delete) -{ - int ret = 0, index = 0; - struct ocfs2_refcount_rec rec; - unsigned int r_count = 0, r_len; - struct super_block *sb = ocfs2_metadata_cache_get_super(ci); - struct buffer_head *ref_leaf_bh = NULL; - - trace_ocfs2_decrease_refcount( - (unsigned long long)ocfs2_metadata_cache_owner(ci), - (unsigned long long)cpos, len, delete); - - while (len) { - ret = ocfs2_get_refcount_rec(ci, ref_root_bh, - cpos, len, &rec, &index, - &ref_leaf_bh); - if (ret) { - mlog_errno(ret); - goto out; - } - - r_count = le32_to_cpu(rec.r_refcount); - BUG_ON(r_count == 0); - if (!delete) - BUG_ON(r_count > 1); - - r_len = min((u64)(cpos + len), le64_to_cpu(rec.r_cpos) + - le32_to_cpu(rec.r_clusters)) - cpos; - - ret = ocfs2_decrease_refcount_rec(handle, ci, ref_root_bh, - ref_leaf_bh, index, - cpos, r_len, - meta_ac, dealloc); - if (ret) { - mlog_errno(ret); - goto out; - } - - if (le32_to_cpu(rec.r_refcount) == 1 && delete) { - ret = ocfs2_cache_cluster_dealloc(dealloc, - ocfs2_clusters_to_blocks(sb, cpos), - r_len); - if (ret) { - mlog_errno(ret); - goto out; - } - } - - cpos += r_len; - len -= r_len; - brelse(ref_leaf_bh); - ref_leaf_bh = NULL; - } - -out: - brelse(ref_leaf_bh); - return ret; -} - -/* Caller must hold refcount tree lock. */ -int ocfs2_decrease_refcount(struct inode *inode, - handle_t *handle, u32 cpos, u32 len, - struct ocfs2_alloc_context *meta_ac, - struct ocfs2_cached_dealloc_ctxt *dealloc, - int delete) -{ - int ret; - u64 ref_blkno; - struct ocfs2_inode_info *oi = OCFS2_I(inode); - struct buffer_head *ref_root_bh = NULL; - struct ocfs2_refcount_tree *tree; - - BUG_ON(!(oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL)); - - ret = ocfs2_get_refcount_block(inode, &ref_blkno); - if (ret) { - mlog_errno(ret); - goto out; - } - - ret = ocfs2_get_refcount_tree(OCFS2_SB(inode->i_sb), ref_blkno, &tree); - if (ret) { - mlog_errno(ret); - goto out; - } - - ret = ocfs2_read_refcount_block(&tree->rf_ci, tree->rf_blkno, - &ref_root_bh); - if (ret) { - mlog_errno(ret); - goto out; - } - - ret = __ocfs2_decrease_refcount(handle, &tree->rf_ci, ref_root_bh, - cpos, len, meta_ac, dealloc, delete); - if (ret) - mlog_errno(ret); -out: - brelse(ref_root_bh); - return ret; -} - -/* - * Mark the already-existing extent at cpos as refcounted for len clusters. - * This adds the refcount extent flag. - * - * If the existing extent is larger than the request, initiate a - * split. An attempt will be made at merging with adjacent extents. - * - * The caller is responsible for passing down meta_ac if we'll need it. - */ -static int ocfs2_mark_extent_refcounted(struct inode *inode, - struct ocfs2_extent_tree *et, - handle_t *handle, u32 cpos, - u32 len, u32 phys, - struct ocfs2_alloc_context *meta_ac, - struct ocfs2_cached_dealloc_ctxt *dealloc) -{ - int ret; - - trace_ocfs2_mark_extent_refcounted(OCFS2_I(inode)->ip_blkno, - cpos, len, phys); - - if (!ocfs2_refcount_tree(OCFS2_SB(inode->i_sb))) { - ocfs2_error(inode->i_sb, "Inode %lu want to use refcount " - "tree, but the feature bit is not set in the " - "super block.", inode->i_ino); - ret = -EROFS; - goto out; - } - - ret = ocfs2_change_extent_flag(handle, et, cpos, - len, phys, meta_ac, dealloc, - OCFS2_EXT_REFCOUNTED, 0); - if (ret) - mlog_errno(ret); - -out: - return ret; -} - -/* - * Given some contiguous physical clusters, calculate what we need - * for modifying their refcount. - */ -static int ocfs2_calc_refcount_meta_credits(struct super_block *sb, - struct ocfs2_caching_info *ci, - struct buffer_head *ref_root_bh, - u64 start_cpos, - u32 clusters, - int *meta_add, - int *credits) -{ - int ret = 0, index, ref_blocks = 0, recs_add = 0; - u64 cpos = start_cpos; - struct ocfs2_refcount_block *rb; - struct ocfs2_refcount_rec rec; - struct buffer_head *ref_leaf_bh = NULL, *prev_bh = NULL; - u32 len; - - while (clusters) { - ret = ocfs2_get_refcount_rec(ci, ref_root_bh, - cpos, clusters, &rec, - &index, &ref_leaf_bh); - if (ret) { - mlog_errno(ret); - goto out; - } - - if (ref_leaf_bh != prev_bh) { - /* - * Now we encounter a new leaf block, so calculate - * whether we need to extend the old leaf. - */ - if (prev_bh) { - rb = (struct ocfs2_refcount_block *) - prev_bh->b_data; - - if (le16_to_cpu(rb->rf_records.rl_used) + - recs_add > - le16_to_cpu(rb->rf_records.rl_count)) - ref_blocks++; - } - - recs_add = 0; - *credits += 1; - brelse(prev_bh); - prev_bh = ref_leaf_bh; - get_bh(prev_bh); - } - - rb = (struct ocfs2_refcount_block *)ref_leaf_bh->b_data; - - trace_ocfs2_calc_refcount_meta_credits_iterate( - recs_add, (unsigned long long)cpos, clusters, - (unsigned long long)le64_to_cpu(rec.r_cpos), - le32_to_cpu(rec.r_clusters), - le32_to_cpu(rec.r_refcount), index); - - len = min((u64)cpos + clusters, le64_to_cpu(rec.r_cpos) + - le32_to_cpu(rec.r_clusters)) - cpos; - /* - * We record all the records which will be inserted to the - * same refcount block, so that we can tell exactly whether - * we need a new refcount block or not. - * - * If we will insert a new one, this is easy and only happens - * during adding refcounted flag to the extent, so we don't - * have a chance of spliting. We just need one record. - * - * If the refcount rec already exists, that would be a little - * complicated. we may have to: - * 1) split at the beginning if the start pos isn't aligned. - * we need 1 more record in this case. - * 2) split int the end if the end pos isn't aligned. - * we need 1 more record in this case. - * 3) split in the middle because of file system fragmentation. - * we need 2 more records in this case(we can't detect this - * beforehand, so always think of the worst case). - */ - if (rec.r_refcount) { - recs_add += 2; - /* Check whether we need a split at the beginning. */ - if (cpos == start_cpos && - cpos != le64_to_cpu(rec.r_cpos)) - recs_add++; - - /* Check whether we need a split in the end. */ - if (cpos + clusters < le64_to_cpu(rec.r_cpos) + - le32_to_cpu(rec.r_clusters)) - recs_add++; - } else - recs_add++; - - brelse(ref_leaf_bh); - ref_leaf_bh = NULL; - clusters -= len; - cpos += len; - } - - if (prev_bh) { - rb = (struct ocfs2_refcount_block *)prev_bh->b_data; - - if (le16_to_cpu(rb->rf_records.rl_used) + recs_add > - le16_to_cpu(rb->rf_records.rl_count)) - ref_blocks++; - - *credits += 1; - } - - if (!ref_blocks) - goto out; - - *meta_add += ref_blocks; - *credits += ref_blocks; - - /* - * So we may need ref_blocks to insert into the tree. - * That also means we need to change the b-tree and add that number - * of records since we never merge them. - * We need one more block for expansion since the new created leaf - * block is also full and needs split. - */ - rb = (struct ocfs2_refcount_block *)ref_root_bh->b_data; - if (le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL) { - struct ocfs2_extent_tree et; - - ocfs2_init_refcount_extent_tree(&et, ci, ref_root_bh); - *meta_add += ocfs2_extend_meta_needed(et.et_root_el); - *credits += ocfs2_calc_extend_credits(sb, - et.et_root_el, - ref_blocks); - } else { - *credits += OCFS2_EXPAND_REFCOUNT_TREE_CREDITS; - *meta_add += 1; - } - -out: - - trace_ocfs2_calc_refcount_meta_credits( - (unsigned long long)start_cpos, clusters, - *meta_add, *credits); - brelse(ref_leaf_bh); - brelse(prev_bh); - return ret; -} - -/* - * For refcount tree, we will decrease some contiguous clusters - * refcount count, so just go through it to see how many blocks - * we gonna touch and whether we need to create new blocks. - * - * Normally the refcount blocks store these refcount should be - * contiguous also, so that we can get the number easily. - * We will at most add split 2 refcount records and 2 more - * refcount blocks, so just check it in a rough way. - * - * Caller must hold refcount tree lock. - */ -int ocfs2_prepare_refcount_change_for_del(struct inode *inode, - u64 refcount_loc, - u64 phys_blkno, - u32 clusters, - int *credits, - int *ref_blocks) -{ - int ret; - struct ocfs2_inode_info *oi = OCFS2_I(inode); - struct buffer_head *ref_root_bh = NULL; - struct ocfs2_refcount_tree *tree; - u64 start_cpos = ocfs2_blocks_to_clusters(inode->i_sb, phys_blkno); - - if (!ocfs2_refcount_tree(OCFS2_SB(inode->i_sb))) { - ocfs2_error(inode->i_sb, "Inode %lu want to use refcount " - "tree, but the feature bit is not set in the " - "super block.", inode->i_ino); - ret = -EROFS; - goto out; - } - - BUG_ON(!(oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL)); - - ret = ocfs2_get_refcount_tree(OCFS2_SB(inode->i_sb), - refcount_loc, &tree); - if (ret) { - mlog_errno(ret); - goto out; - } - - ret = ocfs2_read_refcount_block(&tree->rf_ci, refcount_loc, - &ref_root_bh); - if (ret) { - mlog_errno(ret); - goto out; - } - - ret = ocfs2_calc_refcount_meta_credits(inode->i_sb, - &tree->rf_ci, - ref_root_bh, - start_cpos, clusters, - ref_blocks, credits); - if (ret) { - mlog_errno(ret); - goto out; - } - - trace_ocfs2_prepare_refcount_change_for_del(*ref_blocks, *credits); - -out: - brelse(ref_root_bh); - return ret; -} - -#define MAX_CONTIG_BYTES 1048576 - -static inline unsigned int ocfs2_cow_contig_clusters(struct super_block *sb) -{ - return ocfs2_clusters_for_bytes(sb, MAX_CONTIG_BYTES); -} - -static inline unsigned int ocfs2_cow_contig_mask(struct super_block *sb) -{ - return ~(ocfs2_cow_contig_clusters(sb) - 1); -} - -/* - * Given an extent that starts at 'start' and an I/O that starts at 'cpos', - * find an offset (start + (n * contig_clusters)) that is closest to cpos - * while still being less than or equal to it. - * - * The goal is to break the extent at a multiple of contig_clusters. - */ -static inline unsigned int ocfs2_cow_align_start(struct super_block *sb, - unsigned int start, - unsigned int cpos) -{ - BUG_ON(start > cpos); - - return start + ((cpos - start) & ocfs2_cow_contig_mask(sb)); -} - -/* - * Given a cluster count of len, pad it out so that it is a multiple - * of contig_clusters. - */ -static inline unsigned int ocfs2_cow_align_length(struct super_block *sb, - unsigned int len) -{ - unsigned int padded = - (len + (ocfs2_cow_contig_clusters(sb) - 1)) & - ocfs2_cow_contig_mask(sb); - - /* Did we wrap? */ - if (padded < len) - padded = UINT_MAX; - - return padded; -} - -/* - * Calculate out the start and number of virtual clusters we need to to CoW. - * - * cpos is vitual start cluster position we want to do CoW in a - * file and write_len is the cluster length. - * max_cpos is the place where we want to stop CoW intentionally. - * - * Normal we will start CoW from the beginning of extent record cotaining cpos. - * We try to break up extents on boundaries of MAX_CONTIG_BYTES so that we - * get good I/O from the resulting extent tree. - */ -static int ocfs2_refcount_cal_cow_clusters(struct inode *inode, - struct ocfs2_extent_list *el, - u32 cpos, - u32 write_len, - u32 max_cpos, - u32 *cow_start, - u32 *cow_len) -{ - int ret = 0; - int tree_height = le16_to_cpu(el->l_tree_depth), i; - struct buffer_head *eb_bh = NULL; - struct ocfs2_extent_block *eb = NULL; - struct ocfs2_extent_rec *rec; - unsigned int want_clusters, rec_end = 0; - int contig_clusters = ocfs2_cow_contig_clusters(inode->i_sb); - int leaf_clusters; - - BUG_ON(cpos + write_len > max_cpos); - - if (tree_height > 0) { - ret = ocfs2_find_leaf(INODE_CACHE(inode), el, cpos, &eb_bh); - if (ret) { - mlog_errno(ret); - goto out; - } - - eb = (struct ocfs2_extent_block *) eb_bh->b_data; - el = &eb->h_list; - - if (el->l_tree_depth) { - ocfs2_error(inode->i_sb, - "Inode %lu has non zero tree depth in " - "leaf block %llu\n", inode->i_ino, - (unsigned long long)eb_bh->b_blocknr); - ret = -EROFS; - goto out; - } - } - - *cow_len = 0; - for (i = 0; i < le16_to_cpu(el->l_next_free_rec); i++) { - rec = &el->l_recs[i]; - - if (ocfs2_is_empty_extent(rec)) { - mlog_bug_on_msg(i != 0, "Inode %lu has empty record in " - "index %d\n", inode->i_ino, i); - continue; - } - - if (le32_to_cpu(rec->e_cpos) + - le16_to_cpu(rec->e_leaf_clusters) <= cpos) - continue; - - if (*cow_len == 0) { - /* - * We should find a refcounted record in the - * first pass. - */ - BUG_ON(!(rec->e_flags & OCFS2_EXT_REFCOUNTED)); - *cow_start = le32_to_cpu(rec->e_cpos); - } - - /* - * If we encounter a hole, a non-refcounted record or - * pass the max_cpos, stop the search. - */ - if ((!(rec->e_flags & OCFS2_EXT_REFCOUNTED)) || - (*cow_len && rec_end != le32_to_cpu(rec->e_cpos)) || - (max_cpos <= le32_to_cpu(rec->e_cpos))) - break; - - leaf_clusters = le16_to_cpu(rec->e_leaf_clusters); - rec_end = le32_to_cpu(rec->e_cpos) + leaf_clusters; - if (rec_end > max_cpos) { - rec_end = max_cpos; - leaf_clusters = rec_end - le32_to_cpu(rec->e_cpos); - } - - /* - * How many clusters do we actually need from - * this extent? First we see how many we actually - * need to complete the write. If that's smaller - * than contig_clusters, we try for contig_clusters. - */ - if (!*cow_len) - want_clusters = write_len; - else - want_clusters = (cpos + write_len) - - (*cow_start + *cow_len); - if (want_clusters < contig_clusters) - want_clusters = contig_clusters; - - /* - * If the write does not cover the whole extent, we - * need to calculate how we're going to split the extent. - * We try to do it on contig_clusters boundaries. - * - * Any extent smaller than contig_clusters will be - * CoWed in its entirety. - */ - if (leaf_clusters <= contig_clusters) - *cow_len += leaf_clusters; - else if (*cow_len || (*cow_start == cpos)) { - /* - * This extent needs to be CoW'd from its - * beginning, so all we have to do is compute - * how many clusters to grab. We align - * want_clusters to the edge of contig_clusters - * to get better I/O. - */ - want_clusters = ocfs2_cow_align_length(inode->i_sb, - want_clusters); - - if (leaf_clusters < want_clusters) - *cow_len += leaf_clusters; - else - *cow_len += want_clusters; - } else if ((*cow_start + contig_clusters) >= - (cpos + write_len)) { - /* - * Breaking off contig_clusters at the front - * of the extent will cover our write. That's - * easy. - */ - *cow_len = contig_clusters; - } else if ((rec_end - cpos) <= contig_clusters) { - /* - * Breaking off contig_clusters at the tail of - * this extent will cover cpos. - */ - *cow_start = rec_end - contig_clusters; - *cow_len = contig_clusters; - } else if ((rec_end - cpos) <= want_clusters) { - /* - * While we can't fit the entire write in this - * extent, we know that the write goes from cpos - * to the end of the extent. Break that off. - * We try to break it at some multiple of - * contig_clusters from the front of the extent. - * Failing that (ie, cpos is within - * contig_clusters of the front), we'll CoW the - * entire extent. - */ - *cow_start = ocfs2_cow_align_start(inode->i_sb, - *cow_start, cpos); - *cow_len = rec_end - *cow_start; - } else { - /* - * Ok, the entire write lives in the middle of - * this extent. Let's try to slice the extent up - * nicely. Optimally, our CoW region starts at - * m*contig_clusters from the beginning of the - * extent and goes for n*contig_clusters, - * covering the entire write. - */ - *cow_start = ocfs2_cow_align_start(inode->i_sb, - *cow_start, cpos); - - want_clusters = (cpos + write_len) - *cow_start; - want_clusters = ocfs2_cow_align_length(inode->i_sb, - want_clusters); - if (*cow_start + want_clusters <= rec_end) - *cow_len = want_clusters; - else - *cow_len = rec_end - *cow_start; - } - - /* Have we covered our entire write yet? */ - if ((*cow_start + *cow_len) >= (cpos + write_len)) - break; - - /* - * If we reach the end of the extent block and don't get enough - * clusters, continue with the next extent block if possible. - */ - if (i + 1 == le16_to_cpu(el->l_next_free_rec) && - eb && eb->h_next_leaf_blk) { - brelse(eb_bh); - eb_bh = NULL; - - ret = ocfs2_read_extent_block(INODE_CACHE(inode), - le64_to_cpu(eb->h_next_leaf_blk), - &eb_bh); - if (ret) { - mlog_errno(ret); - goto out; - } - - eb = (struct ocfs2_extent_block *) eb_bh->b_data; - el = &eb->h_list; - i = -1; - } - } - -out: - brelse(eb_bh); - return ret; -} - -/* - * Prepare meta_ac, data_ac and calculate credits when we want to add some - * num_clusters in data_tree "et" and change the refcount for the old - * clusters(starting form p_cluster) in the refcount tree. - * - * Note: - * 1. since we may split the old tree, so we at most will need num_clusters + 2 - * more new leaf records. - * 2. In some case, we may not need to reserve new clusters(e.g, reflink), so - * just give data_ac = NULL. - */ -static int ocfs2_lock_refcount_allocators(struct super_block *sb, - u32 p_cluster, u32 num_clusters, - struct ocfs2_extent_tree *et, - struct ocfs2_caching_info *ref_ci, - struct buffer_head *ref_root_bh, - struct ocfs2_alloc_context **meta_ac, - struct ocfs2_alloc_context **data_ac, - int *credits) -{ - int ret = 0, meta_add = 0; - int num_free_extents = ocfs2_num_free_extents(OCFS2_SB(sb), et); - - if (num_free_extents < 0) { - ret = num_free_extents; - mlog_errno(ret); - goto out; - } - - if (num_free_extents < num_clusters + 2) - meta_add = - ocfs2_extend_meta_needed(et->et_root_el); - - *credits += ocfs2_calc_extend_credits(sb, et->et_root_el, - num_clusters + 2); - - ret = ocfs2_calc_refcount_meta_credits(sb, ref_ci, ref_root_bh, - p_cluster, num_clusters, - &meta_add, credits); - if (ret) { - mlog_errno(ret); - goto out; - } - - trace_ocfs2_lock_refcount_allocators(meta_add, *credits); - ret = ocfs2_reserve_new_metadata_blocks(OCFS2_SB(sb), meta_add, - meta_ac); - if (ret) { - mlog_errno(ret); - goto out; - } - - if (data_ac) { - ret = ocfs2_reserve_clusters(OCFS2_SB(sb), num_clusters, - data_ac); - if (ret) - mlog_errno(ret); - } - -out: - if (ret) { - if (*meta_ac) { - ocfs2_free_alloc_context(*meta_ac); - *meta_ac = NULL; - } - } - - return ret; -} - -static int ocfs2_clear_cow_buffer(handle_t *handle, struct buffer_head *bh) -{ - BUG_ON(buffer_dirty(bh)); - - clear_buffer_mapped(bh); - - return 0; -} - -int ocfs2_duplicate_clusters_by_page(handle_t *handle, - struct file *file, - u32 cpos, u32 old_cluster, - u32 new_cluster, u32 new_len) -{ - int ret = 0, partial; - struct inode *inode = file->f_path.dentry->d_inode; - struct ocfs2_caching_info *ci = INODE_CACHE(inode); - struct super_block *sb = ocfs2_metadata_cache_get_super(ci); - u64 new_block = ocfs2_clusters_to_blocks(sb, new_cluster); - struct page *page; - pgoff_t page_index; - unsigned int from, to, readahead_pages; - loff_t offset, end, map_end; - struct address_space *mapping = inode->i_mapping; - - trace_ocfs2_duplicate_clusters_by_page(cpos, old_cluster, - new_cluster, new_len); - - readahead_pages = - (ocfs2_cow_contig_clusters(sb) << - OCFS2_SB(sb)->s_clustersize_bits) >> PAGE_CACHE_SHIFT; - offset = ((loff_t)cpos) << OCFS2_SB(sb)->s_clustersize_bits; - end = offset + (new_len << OCFS2_SB(sb)->s_clustersize_bits); - /* - * We only duplicate pages until we reach the page contains i_size - 1. - * So trim 'end' to i_size. - */ - if (end > i_size_read(inode)) - end = i_size_read(inode); - - while (offset < end) { - page_index = offset >> PAGE_CACHE_SHIFT; - map_end = ((loff_t)page_index + 1) << PAGE_CACHE_SHIFT; - if (map_end > end) - map_end = end; - - /* from, to is the offset within the page. */ - from = offset & (PAGE_CACHE_SIZE - 1); - to = PAGE_CACHE_SIZE; - if (map_end & (PAGE_CACHE_SIZE - 1)) - to = map_end & (PAGE_CACHE_SIZE - 1); - - page = find_or_create_page(mapping, page_index, GFP_NOFS); - - /* - * In case PAGE_CACHE_SIZE <= CLUSTER_SIZE, This page - * can't be dirtied before we CoW it out. - */ - if (PAGE_CACHE_SIZE <= OCFS2_SB(sb)->s_clustersize) - BUG_ON(PageDirty(page)); - - if (PageReadahead(page)) { - page_cache_async_readahead(mapping, - &file->f_ra, file, - page, page_index, - readahead_pages); - } - - if (!PageUptodate(page)) { - ret = block_read_full_page(page, ocfs2_get_block); - if (ret) { - mlog_errno(ret); - goto unlock; - } - lock_page(page); - } - - if (page_has_buffers(page)) { - ret = walk_page_buffers(handle, page_buffers(page), - from, to, &partial, - ocfs2_clear_cow_buffer); - if (ret) { - mlog_errno(ret); - goto unlock; - } - } - - ocfs2_map_and_dirty_page(inode, handle, from, to, - page, 0, &new_block); - mark_page_accessed(page); -unlock: - unlock_page(page); - page_cache_release(page); - page = NULL; - offset = map_end; - if (ret) - break; - } - - return ret; -} - -int ocfs2_duplicate_clusters_by_jbd(handle_t *handle, - struct file *file, - u32 cpos, u32 old_cluster, - u32 new_cluster, u32 new_len) -{ - int ret = 0; - struct inode *inode = file->f_path.dentry->d_inode; - struct super_block *sb = inode->i_sb; - struct ocfs2_caching_info *ci = INODE_CACHE(inode); - int i, blocks = ocfs2_clusters_to_blocks(sb, new_len); - u64 old_block = ocfs2_clusters_to_blocks(sb, old_cluster); - u64 new_block = ocfs2_clusters_to_blocks(sb, new_cluster); - struct ocfs2_super *osb = OCFS2_SB(sb); - struct buffer_head *old_bh = NULL; - struct buffer_head *new_bh = NULL; - - trace_ocfs2_duplicate_clusters_by_page(cpos, old_cluster, - new_cluster, new_len); - - for (i = 0; i < blocks; i++, old_block++, new_block++) { - new_bh = sb_getblk(osb->sb, new_block); - if (new_bh == NULL) { - ret = -EIO; - mlog_errno(ret); - break; - } - - ocfs2_set_new_buffer_uptodate(ci, new_bh); - - ret = ocfs2_read_block(ci, old_block, &old_bh, NULL); - if (ret) { - mlog_errno(ret); - break; - } - - ret = ocfs2_journal_access(handle, ci, new_bh, - OCFS2_JOURNAL_ACCESS_CREATE); - if (ret) { - mlog_errno(ret); - break; - } - - memcpy(new_bh->b_data, old_bh->b_data, sb->s_blocksize); - ocfs2_journal_dirty(handle, new_bh); - - brelse(new_bh); - brelse(old_bh); - new_bh = NULL; - old_bh = NULL; - } - - brelse(new_bh); - brelse(old_bh); - return ret; -} - -static int ocfs2_clear_ext_refcount(handle_t *handle, - struct ocfs2_extent_tree *et, - u32 cpos, u32 p_cluster, u32 len, - unsigned int ext_flags, - struct ocfs2_alloc_context *meta_ac, - struct ocfs2_cached_dealloc_ctxt *dealloc) -{ - int ret, index; - struct ocfs2_extent_rec replace_rec; - struct ocfs2_path *path = NULL; - struct ocfs2_extent_list *el; - struct super_block *sb = ocfs2_metadata_cache_get_super(et->et_ci); - u64 ino = ocfs2_metadata_cache_owner(et->et_ci); - - trace_ocfs2_clear_ext_refcount((unsigned long long)ino, - cpos, len, p_cluster, ext_flags); - - 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(sb, - p_cluster)); - replace_rec.e_flags = ext_flags; - replace_rec.e_flags &= ~OCFS2_EXT_REFCOUNTED; - - path = ocfs2_new_path_from_et(et); - if (!path) { - ret = -ENOMEM; - mlog_errno(ret); - goto out; - } - - ret = ocfs2_find_path(et->et_ci, 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(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; - } - - ret = ocfs2_split_extent(handle, et, path, index, - &replace_rec, meta_ac, dealloc); - if (ret) - mlog_errno(ret); - -out: - ocfs2_free_path(path); - return ret; -} - -static int ocfs2_replace_clusters(handle_t *handle, - struct ocfs2_cow_context *context, - u32 cpos, u32 old, - u32 new, u32 len, - unsigned int ext_flags) -{ - int ret; - struct ocfs2_caching_info *ci = context->data_et.et_ci; - u64 ino = ocfs2_metadata_cache_owner(ci); - - trace_ocfs2_replace_clusters((unsigned long long)ino, - cpos, old, new, len, ext_flags); - - /*If the old clusters is unwritten, no need to duplicate. */ - if (!(ext_flags & OCFS2_EXT_UNWRITTEN)) { - ret = context->cow_duplicate_clusters(handle, context->file, - cpos, old, new, len); - if (ret) { - mlog_errno(ret); - goto out; - } - } - - ret = ocfs2_clear_ext_refcount(handle, &context->data_et, - cpos, new, len, ext_flags, - context->meta_ac, &context->dealloc); - if (ret) - mlog_errno(ret); -out: - return ret; -} - -int ocfs2_cow_sync_writeback(struct super_block *sb, - struct inode *inode, - u32 cpos, u32 num_clusters) -{ - int ret = 0; - loff_t offset, end, map_end; - pgoff_t page_index; - struct page *page; - - if (ocfs2_should_order_data(inode)) - return 0; - - offset = ((loff_t)cpos) << OCFS2_SB(sb)->s_clustersize_bits; - end = offset + (num_clusters << OCFS2_SB(sb)->s_clustersize_bits); - - ret = filemap_fdatawrite_range(inode->i_mapping, - offset, end - 1); - if (ret < 0) { - mlog_errno(ret); - return ret; - } - - while (offset < end) { - page_index = offset >> PAGE_CACHE_SHIFT; - map_end = ((loff_t)page_index + 1) << PAGE_CACHE_SHIFT; - if (map_end > end) - map_end = end; - - page = find_or_create_page(inode->i_mapping, - page_index, GFP_NOFS); - BUG_ON(!page); - - wait_on_page_writeback(page); - if (PageError(page)) { - ret = -EIO; - mlog_errno(ret); - } else - mark_page_accessed(page); - - unlock_page(page); - page_cache_release(page); - page = NULL; - offset = map_end; - if (ret) - break; - } - - return ret; -} - -static int ocfs2_di_get_clusters(struct ocfs2_cow_context *context, - u32 v_cluster, u32 *p_cluster, - u32 *num_clusters, - unsigned int *extent_flags) -{ - return ocfs2_get_clusters(context->inode, v_cluster, p_cluster, - num_clusters, extent_flags); -} - -static int ocfs2_make_clusters_writable(struct super_block *sb, - struct ocfs2_cow_context *context, - u32 cpos, u32 p_cluster, - u32 num_clusters, unsigned int e_flags) -{ - int ret, delete, index, credits = 0; - u32 new_bit, new_len, orig_num_clusters; - unsigned int set_len; - struct ocfs2_super *osb = OCFS2_SB(sb); - handle_t *handle; - struct buffer_head *ref_leaf_bh = NULL; - struct ocfs2_caching_info *ref_ci = &context->ref_tree->rf_ci; - struct ocfs2_refcount_rec rec; - - trace_ocfs2_make_clusters_writable(cpos, p_cluster, - num_clusters, e_flags); - - ret = ocfs2_lock_refcount_allocators(sb, p_cluster, num_clusters, - &context->data_et, - ref_ci, - context->ref_root_bh, - &context->meta_ac, - &context->data_ac, &credits); - if (ret) { - mlog_errno(ret); - return ret; - } - - if (context->post_refcount) - credits += context->post_refcount->credits; - - credits += context->extra_credits; - handle = ocfs2_start_trans(osb, credits); - if (IS_ERR(handle)) { - ret = PTR_ERR(handle); - mlog_errno(ret); - goto out; - } - - orig_num_clusters = num_clusters; - - while (num_clusters) { - ret = ocfs2_get_refcount_rec(ref_ci, context->ref_root_bh, - p_cluster, num_clusters, - &rec, &index, &ref_leaf_bh); - if (ret) { - mlog_errno(ret); - goto out_commit; - } - - BUG_ON(!rec.r_refcount); - set_len = min((u64)p_cluster + num_clusters, - le64_to_cpu(rec.r_cpos) + - le32_to_cpu(rec.r_clusters)) - p_cluster; - - /* - * There are many different situation here. - * 1. If refcount == 1, remove the flag and don't COW. - * 2. If refcount > 1, allocate clusters. - * Here we may not allocate r_len once at a time, so continue - * until we reach num_clusters. - */ - if (le32_to_cpu(rec.r_refcount) == 1) { - delete = 0; - ret = ocfs2_clear_ext_refcount(handle, - &context->data_et, - cpos, p_cluster, - set_len, e_flags, - context->meta_ac, - &context->dealloc); - if (ret) { - mlog_errno(ret); - goto out_commit; - } - } else { - delete = 1; - - ret = __ocfs2_claim_clusters(handle, - context->data_ac, - 1, set_len, - &new_bit, &new_len); - if (ret) { - mlog_errno(ret); - goto out_commit; - } - - ret = ocfs2_replace_clusters(handle, context, - cpos, p_cluster, new_bit, - new_len, e_flags); - if (ret) { - mlog_errno(ret); - goto out_commit; - } - set_len = new_len; - } - - ret = __ocfs2_decrease_refcount(handle, ref_ci, - context->ref_root_bh, - p_cluster, set_len, - context->meta_ac, - &context->dealloc, delete); - if (ret) { - mlog_errno(ret); - goto out_commit; - } - - cpos += set_len; - p_cluster += set_len; - num_clusters -= set_len; - brelse(ref_leaf_bh); - ref_leaf_bh = NULL; - } - - /* handle any post_cow action. */ - if (context->post_refcount && context->post_refcount->func) { - ret = context->post_refcount->func(context->inode, handle, - context->post_refcount->para); - if (ret) { - mlog_errno(ret); - goto out_commit; - } - } - - /* - * Here we should write the new page out first if we are - * in write-back mode. - */ - if (context->get_clusters == ocfs2_di_get_clusters) { - ret = ocfs2_cow_sync_writeback(sb, context->inode, cpos, - orig_num_clusters); - if (ret) - mlog_errno(ret); - } - -out_commit: - ocfs2_commit_trans(osb, handle); - -out: - 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; - } - brelse(ref_leaf_bh); - - return ret; -} - -static int ocfs2_replace_cow(struct ocfs2_cow_context *context) -{ - int ret = 0; - struct inode *inode = context->inode; - u32 cow_start = context->cow_start, cow_len = context->cow_len; - u32 p_cluster, num_clusters; - unsigned int ext_flags; - struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); - - if (!ocfs2_refcount_tree(OCFS2_SB(inode->i_sb))) { - ocfs2_error(inode->i_sb, "Inode %lu want to use refcount " - "tree, but the feature bit is not set in the " - "super block.", inode->i_ino); - return -EROFS; - } - - ocfs2_init_dealloc_ctxt(&context->dealloc); - - while (cow_len) { - ret = context->get_clusters(context, cow_start, &p_cluster, - &num_clusters, &ext_flags); - if (ret) { - mlog_errno(ret); - break; - } - - BUG_ON(!(ext_flags & OCFS2_EXT_REFCOUNTED)); - - if (cow_len < num_clusters) - num_clusters = cow_len; - - ret = ocfs2_make_clusters_writable(inode->i_sb, context, - cow_start, p_cluster, - num_clusters, ext_flags); - if (ret) { - mlog_errno(ret); - break; - } - - cow_len -= num_clusters; - cow_start += num_clusters; - } - - if (ocfs2_dealloc_has_cluster(&context->dealloc)) { - ocfs2_schedule_truncate_log_flush(osb, 1); - ocfs2_run_deallocs(osb, &context->dealloc); - } - - return ret; -} - -static void ocfs2_readahead_for_cow(struct inode *inode, - struct file *file, - u32 start, u32 len) -{ - struct address_space *mapping; - pgoff_t index; - unsigned long num_pages; - int cs_bits = OCFS2_SB(inode->i_sb)->s_clustersize_bits; - - if (!file) - return; - - mapping = file->f_mapping; - num_pages = (len << cs_bits) >> PAGE_CACHE_SHIFT; - if (!num_pages) - num_pages = 1; - - index = ((loff_t)start << cs_bits) >> PAGE_CACHE_SHIFT; - page_cache_sync_readahead(mapping, &file->f_ra, file, - index, num_pages); -} - -/* - * Starting at cpos, try to CoW write_len clusters. Don't CoW - * past max_cpos. This will stop when it runs into a hole or an - * unrefcounted extent. - */ -static int ocfs2_refcount_cow_hunk(struct inode *inode, - struct file *file, - struct buffer_head *di_bh, - u32 cpos, u32 write_len, u32 max_cpos) -{ - int ret; - u32 cow_start = 0, cow_len = 0; - struct ocfs2_inode_info *oi = OCFS2_I(inode); - struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); - struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data; - struct buffer_head *ref_root_bh = NULL; - struct ocfs2_refcount_tree *ref_tree; - struct ocfs2_cow_context *context = NULL; - - BUG_ON(!(oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL)); - - ret = ocfs2_refcount_cal_cow_clusters(inode, &di->id2.i_list, - cpos, write_len, max_cpos, - &cow_start, &cow_len); - if (ret) { - mlog_errno(ret); - goto out; - } - - trace_ocfs2_refcount_cow_hunk(OCFS2_I(inode)->ip_blkno, - cpos, write_len, max_cpos, - cow_start, cow_len); - - BUG_ON(cow_len == 0); - - ocfs2_readahead_for_cow(inode, file, cow_start, cow_len); - - context = kzalloc(sizeof(struct ocfs2_cow_context), GFP_NOFS); - if (!context) { - ret = -ENOMEM; - mlog_errno(ret); - goto out; - } - - ret = ocfs2_lock_refcount_tree(osb, le64_to_cpu(di->i_refcount_loc), - 1, &ref_tree, &ref_root_bh); - if (ret) { - mlog_errno(ret); - goto out; - } - - context->inode = inode; - context->cow_start = cow_start; - context->cow_len = cow_len; - context->ref_tree = ref_tree; - context->ref_root_bh = ref_root_bh; - context->cow_duplicate_clusters = ocfs2_duplicate_clusters_by_page; - context->get_clusters = ocfs2_di_get_clusters; - context->file = file; - - ocfs2_init_dinode_extent_tree(&context->data_et, - INODE_CACHE(inode), di_bh); - - ret = ocfs2_replace_cow(context); - if (ret) - mlog_errno(ret); - - /* - * truncate the extent map here since no matter whether we meet with - * any error during the action, we shouldn't trust cached extent map - * any more. - */ - ocfs2_extent_map_trunc(inode, cow_start); - - ocfs2_unlock_refcount_tree(osb, ref_tree, 1); - brelse(ref_root_bh); -out: - kfree(context); - return ret; -} - -/* - * CoW any and all clusters between cpos and cpos+write_len. - * Don't CoW past max_cpos. If this returns successfully, all - * clusters between cpos and cpos+write_len are safe to modify. - */ -int ocfs2_refcount_cow(struct inode *inode, - struct file *file, - struct buffer_head *di_bh, - u32 cpos, u32 write_len, u32 max_cpos) -{ - int ret = 0; - u32 p_cluster, num_clusters; - unsigned int ext_flags; - - while (write_len) { - ret = ocfs2_get_clusters(inode, cpos, &p_cluster, - &num_clusters, &ext_flags); - if (ret) { - mlog_errno(ret); - break; - } - - if (write_len < num_clusters) - num_clusters = write_len; - - if (ext_flags & OCFS2_EXT_REFCOUNTED) { - ret = ocfs2_refcount_cow_hunk(inode, file, di_bh, cpos, - num_clusters, max_cpos); - if (ret) { - mlog_errno(ret); - break; - } - } - - write_len -= num_clusters; - cpos += num_clusters; - } - - return ret; -} - -static int ocfs2_xattr_value_get_clusters(struct ocfs2_cow_context *context, - u32 v_cluster, u32 *p_cluster, - u32 *num_clusters, - unsigned int *extent_flags) -{ - struct inode *inode = context->inode; - struct ocfs2_xattr_value_root *xv = context->cow_object; - - return ocfs2_xattr_get_clusters(inode, v_cluster, p_cluster, - num_clusters, &xv->xr_list, - extent_flags); -} - -/* - * Given a xattr value root, calculate the most meta/credits we need for - * refcount tree change if we truncate it to 0. - */ -int ocfs2_refcounted_xattr_delete_need(struct inode *inode, - struct ocfs2_caching_info *ref_ci, - struct buffer_head *ref_root_bh, - struct ocfs2_xattr_value_root *xv, - int *meta_add, int *credits) -{ - int ret = 0, index, ref_blocks = 0; - u32 p_cluster, num_clusters; - u32 cpos = 0, clusters = le32_to_cpu(xv->xr_clusters); - struct ocfs2_refcount_block *rb; - struct ocfs2_refcount_rec rec; - struct buffer_head *ref_leaf_bh = NULL; - - while (cpos < clusters) { - ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster, - &num_clusters, &xv->xr_list, - NULL); - if (ret) { - mlog_errno(ret); - goto out; - } - - cpos += num_clusters; - - while (num_clusters) { - ret = ocfs2_get_refcount_rec(ref_ci, ref_root_bh, - p_cluster, num_clusters, - &rec, &index, - &ref_leaf_bh); - if (ret) { - mlog_errno(ret); - goto out; - } - - BUG_ON(!rec.r_refcount); - - rb = (struct ocfs2_refcount_block *)ref_leaf_bh->b_data; - - /* - * We really don't know whether the other clusters is in - * this refcount block or not, so just take the worst - * case that all the clusters are in this block and each - * one will split a refcount rec, so totally we need - * clusters * 2 new refcount rec. - */ - if (le16_to_cpu(rb->rf_records.rl_used) + clusters * 2 > - le16_to_cpu(rb->rf_records.rl_count)) - ref_blocks++; - - *credits += 1; - brelse(ref_leaf_bh); - ref_leaf_bh = NULL; - - if (num_clusters <= le32_to_cpu(rec.r_clusters)) - break; - else - num_clusters -= le32_to_cpu(rec.r_clusters); - p_cluster += num_clusters; - } - } - - *meta_add += ref_blocks; - if (!ref_blocks) - goto out; - - rb = (struct ocfs2_refcount_block *)ref_root_bh->b_data; - if (le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL) - *credits += OCFS2_EXPAND_REFCOUNT_TREE_CREDITS; - else { - struct ocfs2_extent_tree et; - - ocfs2_init_refcount_extent_tree(&et, ref_ci, ref_root_bh); - *credits += ocfs2_calc_extend_credits(inode->i_sb, - et.et_root_el, - ref_blocks); - } - -out: - brelse(ref_leaf_bh); - return ret; -} - -/* - * Do CoW for xattr. - */ -int ocfs2_refcount_cow_xattr(struct inode *inode, - struct ocfs2_dinode *di, - struct ocfs2_xattr_value_buf *vb, - struct ocfs2_refcount_tree *ref_tree, - struct buffer_head *ref_root_bh, - u32 cpos, u32 write_len, - struct ocfs2_post_refcount *post) -{ - int ret; - struct ocfs2_xattr_value_root *xv = vb->vb_xv; - struct ocfs2_inode_info *oi = OCFS2_I(inode); - struct ocfs2_cow_context *context = NULL; - u32 cow_start, cow_len; - - BUG_ON(!(oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL)); - - ret = ocfs2_refcount_cal_cow_clusters(inode, &xv->xr_list, - cpos, write_len, UINT_MAX, - &cow_start, &cow_len); - if (ret) { - mlog_errno(ret); - goto out; - } - - BUG_ON(cow_len == 0); - - context = kzalloc(sizeof(struct ocfs2_cow_context), GFP_NOFS); - if (!context) { - ret = -ENOMEM; - mlog_errno(ret); - goto out; - } - - context->inode = inode; - context->cow_start = cow_start; - context->cow_len = cow_len; - context->ref_tree = ref_tree; - context->ref_root_bh = ref_root_bh; - context->cow_object = xv; - - context->cow_duplicate_clusters = ocfs2_duplicate_clusters_by_jbd; - /* We need the extra credits for duplicate_clusters by jbd. */ - context->extra_credits = - ocfs2_clusters_to_blocks(inode->i_sb, 1) * cow_len; - context->get_clusters = ocfs2_xattr_value_get_clusters; - context->post_refcount = post; - - ocfs2_init_xattr_value_extent_tree(&context->data_et, - INODE_CACHE(inode), vb); - - ret = ocfs2_replace_cow(context); - if (ret) - mlog_errno(ret); - -out: - kfree(context); - return ret; -} - -/* - * Insert a new extent into refcount tree and mark a extent rec - * as refcounted in the dinode tree. - */ -int ocfs2_add_refcount_flag(struct inode *inode, - struct ocfs2_extent_tree *data_et, - struct ocfs2_caching_info *ref_ci, - struct buffer_head *ref_root_bh, - u32 cpos, u32 p_cluster, u32 num_clusters, - struct ocfs2_cached_dealloc_ctxt *dealloc, - struct ocfs2_post_refcount *post) -{ - int ret; - handle_t *handle; - int credits = 1, ref_blocks = 0; - struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); - struct ocfs2_alloc_context *meta_ac = NULL; - - ret = ocfs2_calc_refcount_meta_credits(inode->i_sb, - ref_ci, ref_root_bh, - p_cluster, num_clusters, - &ref_blocks, &credits); - if (ret) { - mlog_errno(ret); - goto out; - } - - trace_ocfs2_add_refcount_flag(ref_blocks, credits); - - if (ref_blocks) { - ret = ocfs2_reserve_new_metadata_blocks(OCFS2_SB(inode->i_sb), - ref_blocks, &meta_ac); - if (ret) { - mlog_errno(ret); - goto out; - } - } - - if (post) - credits += post->credits; - - handle = ocfs2_start_trans(osb, credits); - if (IS_ERR(handle)) { - ret = PTR_ERR(handle); - mlog_errno(ret); - goto out; - } - - ret = ocfs2_mark_extent_refcounted(inode, data_et, handle, - cpos, num_clusters, p_cluster, - meta_ac, dealloc); - if (ret) { - mlog_errno(ret); - goto out_commit; - } - - ret = __ocfs2_increase_refcount(handle, ref_ci, ref_root_bh, - p_cluster, num_clusters, 0, - meta_ac, dealloc); - if (ret) { - mlog_errno(ret); - goto out_commit; - } - - if (post && post->func) { - ret = post->func(inode, handle, post->para); - if (ret) - mlog_errno(ret); - } - -out_commit: - ocfs2_commit_trans(osb, handle); -out: - if (meta_ac) - ocfs2_free_alloc_context(meta_ac); - return ret; -} - -static int ocfs2_change_ctime(struct inode *inode, - struct buffer_head *di_bh) -{ - int ret; - handle_t *handle; - struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data; - - handle = ocfs2_start_trans(OCFS2_SB(inode->i_sb), - OCFS2_INODE_UPDATE_CREDITS); - if (IS_ERR(handle)) { - ret = PTR_ERR(handle); - mlog_errno(ret); - goto out; - } - - ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh, - OCFS2_JOURNAL_ACCESS_WRITE); - if (ret) { - mlog_errno(ret); - goto out_commit; - } - - 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(OCFS2_SB(inode->i_sb), handle); -out: - return ret; -} - -static int ocfs2_attach_refcount_tree(struct inode *inode, - struct buffer_head *di_bh) -{ - int ret, data_changed = 0; - struct buffer_head *ref_root_bh = NULL; - struct ocfs2_inode_info *oi = OCFS2_I(inode); - struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data; - struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); - struct ocfs2_refcount_tree *ref_tree; - unsigned int ext_flags; - loff_t size; - u32 cpos, num_clusters, clusters, p_cluster; - struct ocfs2_cached_dealloc_ctxt dealloc; - struct ocfs2_extent_tree di_et; - - ocfs2_init_dealloc_ctxt(&dealloc); - - if (!(oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL)) { - ret = ocfs2_create_refcount_tree(inode, di_bh); - if (ret) { - mlog_errno(ret); - goto out; - } - } - - BUG_ON(!di->i_refcount_loc); - ret = ocfs2_lock_refcount_tree(osb, - le64_to_cpu(di->i_refcount_loc), 1, - &ref_tree, &ref_root_bh); - if (ret) { - mlog_errno(ret); - goto out; - } - - if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) - goto attach_xattr; - - ocfs2_init_dinode_extent_tree(&di_et, INODE_CACHE(inode), di_bh); - - size = i_size_read(inode); - clusters = ocfs2_clusters_for_bytes(inode->i_sb, size); - - cpos = 0; - while (cpos < clusters) { - ret = ocfs2_get_clusters(inode, cpos, &p_cluster, - &num_clusters, &ext_flags); - - if (p_cluster && !(ext_flags & OCFS2_EXT_REFCOUNTED)) { - ret = ocfs2_add_refcount_flag(inode, &di_et, - &ref_tree->rf_ci, - ref_root_bh, cpos, - p_cluster, num_clusters, - &dealloc, NULL); - if (ret) { - mlog_errno(ret); - goto unlock; - } - - data_changed = 1; - } - cpos += num_clusters; - } - -attach_xattr: - if (oi->ip_dyn_features & OCFS2_HAS_XATTR_FL) { - ret = ocfs2_xattr_attach_refcount_tree(inode, di_bh, - &ref_tree->rf_ci, - ref_root_bh, - &dealloc); - if (ret) { - mlog_errno(ret); - goto unlock; - } - } - - if (data_changed) { - ret = ocfs2_change_ctime(inode, di_bh); - if (ret) - mlog_errno(ret); - } - -unlock: - ocfs2_unlock_refcount_tree(osb, ref_tree, 1); - brelse(ref_root_bh); - - if (!ret && ocfs2_dealloc_has_cluster(&dealloc)) { - ocfs2_schedule_truncate_log_flush(osb, 1); - ocfs2_run_deallocs(osb, &dealloc); - } -out: - /* - * Empty the extent map so that we may get the right extent - * record from the disk. - */ - ocfs2_extent_map_trunc(inode, 0); - - return ret; -} - -static int ocfs2_add_refcounted_extent(struct inode *inode, - struct ocfs2_extent_tree *et, - struct ocfs2_caching_info *ref_ci, - struct buffer_head *ref_root_bh, - u32 cpos, u32 p_cluster, u32 num_clusters, - unsigned int ext_flags, - struct ocfs2_cached_dealloc_ctxt *dealloc) -{ - int ret; - handle_t *handle; - int credits = 0; - struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); - struct ocfs2_alloc_context *meta_ac = NULL; - - ret = ocfs2_lock_refcount_allocators(inode->i_sb, - p_cluster, num_clusters, - et, ref_ci, - ref_root_bh, &meta_ac, - NULL, &credits); - if (ret) { - mlog_errno(ret); - goto out; - } - - handle = ocfs2_start_trans(osb, credits); - if (IS_ERR(handle)) { - ret = PTR_ERR(handle); - mlog_errno(ret); - goto out; - } - - ret = ocfs2_insert_extent(handle, et, cpos, - ocfs2_clusters_to_blocks(inode->i_sb, p_cluster), - num_clusters, ext_flags, meta_ac); - if (ret) { - mlog_errno(ret); - goto out_commit; - } - - ret = ocfs2_increase_refcount(handle, ref_ci, ref_root_bh, - p_cluster, num_clusters, - meta_ac, dealloc); - if (ret) - mlog_errno(ret); - -out_commit: - ocfs2_commit_trans(osb, handle); -out: - if (meta_ac) - ocfs2_free_alloc_context(meta_ac); - return ret; -} - -static int ocfs2_duplicate_inline_data(struct inode *s_inode, - struct buffer_head *s_bh, - struct inode *t_inode, - struct buffer_head *t_bh) -{ - int ret; - handle_t *handle; - struct ocfs2_super *osb = OCFS2_SB(s_inode->i_sb); - struct ocfs2_dinode *s_di = (struct ocfs2_dinode *)s_bh->b_data; - struct ocfs2_dinode *t_di = (struct ocfs2_dinode *)t_bh->b_data; - - BUG_ON(!(OCFS2_I(s_inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)); - - handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS); - if (IS_ERR(handle)) { - ret = PTR_ERR(handle); - mlog_errno(ret); - goto out; - } - - ret = ocfs2_journal_access_di(handle, INODE_CACHE(t_inode), t_bh, - OCFS2_JOURNAL_ACCESS_WRITE); - if (ret) { - mlog_errno(ret); - goto out_commit; - } - - t_di->id2.i_data.id_count = s_di->id2.i_data.id_count; - memcpy(t_di->id2.i_data.id_data, s_di->id2.i_data.id_data, - le16_to_cpu(s_di->id2.i_data.id_count)); - spin_lock(&OCFS2_I(t_inode)->ip_lock); - OCFS2_I(t_inode)->ip_dyn_features |= OCFS2_INLINE_DATA_FL; - t_di->i_dyn_features = cpu_to_le16(OCFS2_I(t_inode)->ip_dyn_features); - spin_unlock(&OCFS2_I(t_inode)->ip_lock); - - ocfs2_journal_dirty(handle, t_bh); - -out_commit: - ocfs2_commit_trans(osb, handle); -out: - return ret; -} - -static int ocfs2_duplicate_extent_list(struct inode *s_inode, - struct inode *t_inode, - struct buffer_head *t_bh, - struct ocfs2_caching_info *ref_ci, - struct buffer_head *ref_root_bh, - struct ocfs2_cached_dealloc_ctxt *dealloc) -{ - int ret = 0; - u32 p_cluster, num_clusters, clusters, cpos; - loff_t size; - unsigned int ext_flags; - struct ocfs2_extent_tree et; - - ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(t_inode), t_bh); - - size = i_size_read(s_inode); - clusters = ocfs2_clusters_for_bytes(s_inode->i_sb, size); - - cpos = 0; - while (cpos < clusters) { - ret = ocfs2_get_clusters(s_inode, cpos, &p_cluster, - &num_clusters, &ext_flags); - - if (p_cluster) { - ret = ocfs2_add_refcounted_extent(t_inode, &et, - ref_ci, ref_root_bh, - cpos, p_cluster, - num_clusters, - ext_flags, - dealloc); - if (ret) { - mlog_errno(ret); - goto out; - } - } - - cpos += num_clusters; - } - -out: - return ret; -} - -/* - * change the new file's attributes to the src. - * - * reflink creates a snapshot of a file, that means the attributes - * must be identical except for three exceptions - nlink, ino, and ctime. - */ -static int ocfs2_complete_reflink(struct inode *s_inode, - struct buffer_head *s_bh, - struct inode *t_inode, - struct buffer_head *t_bh, - bool preserve) -{ - int ret; - handle_t *handle; - struct ocfs2_dinode *s_di = (struct ocfs2_dinode *)s_bh->b_data; - struct ocfs2_dinode *di = (struct ocfs2_dinode *)t_bh->b_data; - loff_t size = i_size_read(s_inode); - - handle = ocfs2_start_trans(OCFS2_SB(t_inode->i_sb), - OCFS2_INODE_UPDATE_CREDITS); - if (IS_ERR(handle)) { - ret = PTR_ERR(handle); - mlog_errno(ret); - return ret; - } - - ret = ocfs2_journal_access_di(handle, INODE_CACHE(t_inode), t_bh, - OCFS2_JOURNAL_ACCESS_WRITE); - if (ret) { - mlog_errno(ret); - goto out_commit; - } - - spin_lock(&OCFS2_I(t_inode)->ip_lock); - OCFS2_I(t_inode)->ip_clusters = OCFS2_I(s_inode)->ip_clusters; - OCFS2_I(t_inode)->ip_attr = OCFS2_I(s_inode)->ip_attr; - OCFS2_I(t_inode)->ip_dyn_features = OCFS2_I(s_inode)->ip_dyn_features; - spin_unlock(&OCFS2_I(t_inode)->ip_lock); - i_size_write(t_inode, size); - t_inode->i_blocks = s_inode->i_blocks; - - di->i_xattr_inline_size = s_di->i_xattr_inline_size; - di->i_clusters = s_di->i_clusters; - di->i_size = s_di->i_size; - di->i_dyn_features = s_di->i_dyn_features; - di->i_attr = s_di->i_attr; - - if (preserve) { - t_inode->i_uid = s_inode->i_uid; - t_inode->i_gid = s_inode->i_gid; - t_inode->i_mode = s_inode->i_mode; - di->i_uid = s_di->i_uid; - di->i_gid = s_di->i_gid; - di->i_mode = s_di->i_mode; - - /* - * update time. - * we want mtime to appear identical to the source and - * update ctime. - */ - t_inode->i_ctime = CURRENT_TIME; - - di->i_ctime = cpu_to_le64(t_inode->i_ctime.tv_sec); - di->i_ctime_nsec = cpu_to_le32(t_inode->i_ctime.tv_nsec); - - t_inode->i_mtime = s_inode->i_mtime; - di->i_mtime = s_di->i_mtime; - di->i_mtime_nsec = s_di->i_mtime_nsec; - } - - ocfs2_journal_dirty(handle, t_bh); - -out_commit: - ocfs2_commit_trans(OCFS2_SB(t_inode->i_sb), handle); - return ret; -} - -static int ocfs2_create_reflink_node(struct inode *s_inode, - struct buffer_head *s_bh, - struct inode *t_inode, - struct buffer_head *t_bh, - bool preserve) -{ - int ret; - struct buffer_head *ref_root_bh = NULL; - struct ocfs2_cached_dealloc_ctxt dealloc; - struct ocfs2_super *osb = OCFS2_SB(s_inode->i_sb); - struct ocfs2_refcount_block *rb; - struct ocfs2_dinode *di = (struct ocfs2_dinode *)s_bh->b_data; - struct ocfs2_refcount_tree *ref_tree; - - ocfs2_init_dealloc_ctxt(&dealloc); - - ret = ocfs2_set_refcount_tree(t_inode, t_bh, - le64_to_cpu(di->i_refcount_loc)); - if (ret) { - mlog_errno(ret); - goto out; - } - - if (OCFS2_I(s_inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) { - ret = ocfs2_duplicate_inline_data(s_inode, s_bh, - t_inode, t_bh); - if (ret) - mlog_errno(ret); - goto out; - } - - ret = ocfs2_lock_refcount_tree(osb, le64_to_cpu(di->i_refcount_loc), - 1, &ref_tree, &ref_root_bh); - if (ret) { - mlog_errno(ret); - goto out; - } - rb = (struct ocfs2_refcount_block *)ref_root_bh->b_data; - - ret = ocfs2_duplicate_extent_list(s_inode, t_inode, t_bh, - &ref_tree->rf_ci, ref_root_bh, - &dealloc); - if (ret) { - mlog_errno(ret); - goto out_unlock_refcount; - } - -out_unlock_refcount: - ocfs2_unlock_refcount_tree(osb, ref_tree, 1); - brelse(ref_root_bh); -out: - if (ocfs2_dealloc_has_cluster(&dealloc)) { - ocfs2_schedule_truncate_log_flush(osb, 1); - ocfs2_run_deallocs(osb, &dealloc); - } - - return ret; -} - -static int __ocfs2_reflink(struct dentry *old_dentry, - struct buffer_head *old_bh, - struct inode *new_inode, - bool preserve) -{ - int ret; - struct inode *inode = old_dentry->d_inode; - struct buffer_head *new_bh = NULL; - - if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_SYSTEM_FILE) { - ret = -EINVAL; - mlog_errno(ret); - goto out; - } - - ret = filemap_fdatawrite(inode->i_mapping); - if (ret) { - mlog_errno(ret); - goto out; - } - - ret = ocfs2_attach_refcount_tree(inode, old_bh); - if (ret) { - mlog_errno(ret); - goto out; - } - - mutex_lock_nested(&new_inode->i_mutex, I_MUTEX_CHILD); - ret = ocfs2_inode_lock_nested(new_inode, &new_bh, 1, - OI_LS_REFLINK_TARGET); - if (ret) { - mlog_errno(ret); - goto out_unlock; - } - - ret = ocfs2_create_reflink_node(inode, old_bh, - new_inode, new_bh, preserve); - if (ret) { - mlog_errno(ret); - goto inode_unlock; - } - - if (OCFS2_I(inode)->ip_dyn_features & OCFS2_HAS_XATTR_FL) { - ret = ocfs2_reflink_xattrs(inode, old_bh, - new_inode, new_bh, - preserve); - if (ret) { - mlog_errno(ret); - goto inode_unlock; - } - } - - ret = ocfs2_complete_reflink(inode, old_bh, - new_inode, new_bh, preserve); - if (ret) - mlog_errno(ret); - -inode_unlock: - ocfs2_inode_unlock(new_inode, 1); - brelse(new_bh); -out_unlock: - mutex_unlock(&new_inode->i_mutex); -out: - if (!ret) { - ret = filemap_fdatawait(inode->i_mapping); - if (ret) - mlog_errno(ret); - } - return ret; -} - -static int ocfs2_reflink(struct dentry *old_dentry, struct inode *dir, - struct dentry *new_dentry, bool preserve) -{ - int error; - struct inode *inode = old_dentry->d_inode; - struct buffer_head *old_bh = NULL; - struct inode *new_orphan_inode = NULL; - - if (!ocfs2_refcount_tree(OCFS2_SB(inode->i_sb))) - return -EOPNOTSUPP; - - error = ocfs2_create_inode_in_orphan(dir, inode->i_mode, - &new_orphan_inode); - if (error) { - mlog_errno(error); - goto out; - } - - error = ocfs2_inode_lock(inode, &old_bh, 1); - if (error) { - mlog_errno(error); - goto out; - } - - down_write(&OCFS2_I(inode)->ip_xattr_sem); - down_write(&OCFS2_I(inode)->ip_alloc_sem); - error = __ocfs2_reflink(old_dentry, old_bh, - new_orphan_inode, preserve); - up_write(&OCFS2_I(inode)->ip_alloc_sem); - up_write(&OCFS2_I(inode)->ip_xattr_sem); - - ocfs2_inode_unlock(inode, 1); - brelse(old_bh); - - if (error) { - mlog_errno(error); - goto out; - } - - /* If the security isn't preserved, we need to re-initialize them. */ - if (!preserve) { - error = ocfs2_init_security_and_acl(dir, new_orphan_inode, - &new_dentry->d_name); - if (error) - mlog_errno(error); - } -out: - if (!error) { - error = ocfs2_mv_orphaned_inode_to_new(dir, new_orphan_inode, - new_dentry); - if (error) - mlog_errno(error); - } - - if (new_orphan_inode) { - /* - * We need to open_unlock the inode no matter whether we - * succeed or not, so that other nodes can delete it later. - */ - ocfs2_open_unlock(new_orphan_inode); - if (error) - iput(new_orphan_inode); - } - - return error; -} - -/* - * Below here are the bits used by OCFS2_IOC_REFLINK() to fake - * sys_reflink(). This will go away when vfs_reflink() exists in - * fs/namei.c. - */ - -/* copied from may_create in VFS. */ -static inline int ocfs2_may_create(struct inode *dir, struct dentry *child) -{ - if (child->d_inode) - return -EEXIST; - if (IS_DEADDIR(dir)) - return -ENOENT; - return inode_permission(dir, MAY_WRITE | MAY_EXEC); -} - -/** - * ocfs2_vfs_reflink - Create a reference-counted link - * - * @old_dentry: source dentry + inode - * @dir: directory to create the target - * @new_dentry: target dentry - * @preserve: if true, preserve all file attributes - */ -static int ocfs2_vfs_reflink(struct dentry *old_dentry, struct inode *dir, - struct dentry *new_dentry, bool preserve) -{ - struct inode *inode = old_dentry->d_inode; - int error; - - if (!inode) - return -ENOENT; - - error = ocfs2_may_create(dir, new_dentry); - if (error) - return error; - - if (dir->i_sb != inode->i_sb) - return -EXDEV; - - /* - * A reflink to an append-only or immutable file cannot be created. - */ - if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) - return -EPERM; - - /* Only regular files can be reflinked. */ - if (!S_ISREG(inode->i_mode)) - return -EPERM; - - /* - * If the caller wants to preserve ownership, they require the - * rights to do so. - */ - if (preserve) { - if ((current_fsuid() != inode->i_uid) && !capable(CAP_CHOWN)) - return -EPERM; - if (!in_group_p(inode->i_gid) && !capable(CAP_CHOWN)) - return -EPERM; - } - - /* - * If the caller is modifying any aspect of the attributes, they - * are not creating a snapshot. They need read permission on the - * file. - */ - if (!preserve) { - error = inode_permission(inode, MAY_READ); - if (error) - return error; - } - - mutex_lock(&inode->i_mutex); - dquot_initialize(dir); - error = ocfs2_reflink(old_dentry, dir, new_dentry, preserve); - mutex_unlock(&inode->i_mutex); - if (!error) - fsnotify_create(dir, new_dentry); - return error; -} -/* - * Most codes are copied from sys_linkat. - */ -int ocfs2_reflink_ioctl(struct inode *inode, - const char __user *oldname, - const char __user *newname, - bool preserve) -{ - struct dentry *new_dentry; - struct path old_path, new_path; - int error; - - if (!ocfs2_refcount_tree(OCFS2_SB(inode->i_sb))) - return -EOPNOTSUPP; - - error = user_path_at(AT_FDCWD, oldname, 0, &old_path); - if (error) { - mlog_errno(error); - return error; - } - - new_dentry = user_path_create(AT_FDCWD, newname, &new_path, 0); - error = PTR_ERR(new_dentry); - if (IS_ERR(new_dentry)) { - mlog_errno(error); - goto out; - } - - error = -EXDEV; - if (old_path.mnt != new_path.mnt) { - mlog_errno(error); - goto out_dput; - } - - error = mnt_want_write(new_path.mnt); - if (error) { - mlog_errno(error); - goto out_dput; - } - - error = ocfs2_vfs_reflink(old_path.dentry, - new_path.dentry->d_inode, - new_dentry, preserve); - mnt_drop_write(new_path.mnt); -out_dput: - dput(new_dentry); - mutex_unlock(&new_path.dentry->d_inode->i_mutex); - path_put(&new_path); -out: - path_put(&old_path); - - return error; -} |