From: Robin Dong Subject: [PATCH 5/8 bigalloc] ext4: zero out extra pages when truncate file Date: Tue, 1 Nov 2011 18:53:34 +0800 Message-ID: <1320144817-16397-6-git-send-email-hao.bigrat@gmail.com> References: <1320144817-16397-1-git-send-email-hao.bigrat@gmail.com> Cc: Robin Dong To: linux-ext4@vger.kernel.org Return-path: Received: from mail-pz0-f42.google.com ([209.85.210.42]:52678 "EHLO mail-pz0-f42.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753551Ab1KAKyA (ORCPT ); Tue, 1 Nov 2011 06:54:00 -0400 Received: by mail-pz0-f42.google.com with SMTP id 2so1043603pzk.1 for ; Tue, 01 Nov 2011 03:53:59 -0700 (PDT) In-Reply-To: <1320144817-16397-1-git-send-email-hao.bigrat@gmail.com> Sender: linux-ext4-owner@vger.kernel.org List-ID: From: Robin Dong When truncate file to be larger, we need to zero out the pages which beyond the old i_size. Signed-off-by: Robin Dong --- fs/ext4/ext4.h | 4 +- fs/ext4/extents.c | 78 +++++++++++++++++++++++++++++++++++++++++++++++++++- fs/ext4/inode.c | 13 ++++---- fs/ext4/ioctl.c | 2 +- fs/ext4/super.c | 2 +- fs/ext4/truncate.h | 2 +- 6 files changed, 89 insertions(+), 12 deletions(-) diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h index 499da1c..0f58245 100644 --- a/fs/ext4/ext4.h +++ b/fs/ext4/ext4.h @@ -1881,7 +1881,7 @@ extern void ext4_dirty_inode(struct inode *, int); extern int ext4_change_inode_journal_flag(struct inode *, int); extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); extern int ext4_can_truncate(struct inode *inode); -extern void ext4_truncate(struct inode *); +extern void ext4_truncate(struct inode *, loff_t oldsize); extern int ext4_punch_hole(struct file *file, loff_t offset, loff_t length); extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks); extern void ext4_set_inode_flags(struct inode *); @@ -2262,7 +2262,7 @@ extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks, int chunk); extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, struct ext4_map_blocks *map, int flags); -extern void ext4_ext_truncate(struct inode *); +extern void ext4_ext_truncate(struct inode *, loff_t oldsize); extern int ext4_ext_punch_hole(struct file *file, loff_t offset, loff_t length); extern void ext4_ext_init(struct super_block *); diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c index 970d6dc..5c091cf 100644 --- a/fs/ext4/extents.c +++ b/fs/ext4/extents.c @@ -4083,10 +4083,76 @@ out2: return err ? err : result; } -void ext4_ext_truncate(struct inode *inode) +int ext4_ext_truncate_zero_pages(handle_t *handle, struct inode *inode, + loff_t old_size) +{ + struct super_block *sb = inode->i_sb; + struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); + struct ext4_write_cluster_ctxt *ewcc = NULL; + struct page *page; + ext4_lblk_t last_block = ((old_size + sb->s_blocksize - 1) + >> EXT4_BLOCK_SIZE_BITS(sb)) - 1; + ext4_lblk_t left_offset = last_block & (sbi->s_cluster_ratio - 1); + ext4_lblk_t right_offset = sbi->s_cluster_ratio - left_offset - 1; + ext4_lblk_t begin, index; + unsigned long i; + int ret = 0; + unsigned from, to; + + if (sbi->s_cluster_ratio <= 1) + goto out; + + if (right_offset) { + struct ext4_map_blocks map; + map.m_lblk = last_block; + map.m_len = 1; + if (ext4_map_blocks(handle, inode, &map, 0) <= 0 + || map.m_flags & EXT4_MAP_UNWRITTEN) + goto out; + + ewcc = ext4_alloc_write_cluster_ctxt(); + if (!ewcc) { + ret = -ENOMEM; + goto out; + } + + begin = last_block + 1; + for (index = begin; index < last_block + right_offset + 1; + index++) { + ret = ext4_zero_cluster_page(inode, index, ewcc, + mapping_gfp_mask(inode->i_mapping) & ~__GFP_FS); + if (ret) + goto out; + } + + if (ext4_should_journal_data(inode)) { + for (i = 0; i < ewcc->w_num_pages; i++) { + page = ewcc->w_pages[i]; + if (!page || !page_buffers(page)) + continue; + from = page->index << PAGE_CACHE_SHIFT; + to = from + PAGE_CACHE_SIZE; + ret = walk_page_buffers(handle, + page_buffers(page), from, to, NULL, + do_journal_get_write_access); + if (ret) + goto out; + } + } + } + +out: + if (ewcc) + ext4_free_write_cluster_ctxt(ewcc); + + return ret; +} + +void ext4_ext_truncate(struct inode *inode, loff_t old_size) { struct address_space *mapping = inode->i_mapping; struct super_block *sb = inode->i_sb; + struct ext4_sb_info *sbi = EXT4_SB(sb); ext4_lblk_t last_block; handle_t *handle; int err = 0; @@ -4108,6 +4174,9 @@ void ext4_ext_truncate(struct inode *inode) if (inode->i_size & (sb->s_blocksize - 1)) ext4_block_truncate_page(handle, mapping, inode->i_size); + if (ext4_ext_truncate_zero_pages(handle, inode, old_size)) + goto out_stop; + if (ext4_orphan_add(handle, inode)) goto out_stop; @@ -4128,6 +4197,13 @@ void ext4_ext_truncate(struct inode *inode) last_block = (inode->i_size + sb->s_blocksize - 1) >> EXT4_BLOCK_SIZE_BITS(sb); + + if (sbi->s_cluster_ratio > 1 && + (last_block & (sbi->s_cluster_ratio - 1))) { + last_block = (last_block & ~(sbi->s_cluster_ratio - 1)) + + sbi->s_cluster_ratio; + } + err = ext4_ext_remove_space(inode, last_block); /* In a multi-transaction truncate, we only make the final diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index beec081..2b70377 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -213,7 +213,7 @@ void ext4_evict_inode(struct inode *inode) goto stop_handle; } if (inode->i_blocks) - ext4_truncate(inode); + ext4_truncate(inode, 0); /* * ext4_ext_truncate() doesn't reserve any slop when it @@ -3343,7 +3343,7 @@ int ext4_punch_hole(struct file *file, loff_t offset, loff_t length) * that's fine - as long as they are linked from the inode, the post-crash * ext4_truncate() run will find them and release them. */ -void ext4_truncate(struct inode *inode) +void ext4_truncate(struct inode *inode, loff_t old_size) { trace_ext4_truncate_enter(inode); @@ -3356,7 +3356,7 @@ void ext4_truncate(struct inode *inode) ext4_set_inode_state(inode, EXT4_STATE_DA_ALLOC_CLOSE); if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)) - ext4_ext_truncate(inode); + ext4_ext_truncate(inode, old_size); else ext4_ind_truncate(inode); @@ -4123,11 +4123,12 @@ int ext4_setattr(struct dentry *dentry, struct iattr *attr) } if (attr->ia_valid & ATTR_SIZE) { - if (attr->ia_size != i_size_read(inode)) { + loff_t old_size = i_size_read(inode); + if (attr->ia_size != old_size) { truncate_setsize(inode, attr->ia_size); - ext4_truncate(inode); + ext4_truncate(inode, old_size); } else if (ext4_test_inode_flag(inode, EXT4_INODE_EOFBLOCKS)) - ext4_truncate(inode); + ext4_truncate(inode, 0); } if (!rc) { diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c index 4a5081a..6eb2f4f 100644 --- a/fs/ext4/ioctl.c +++ b/fs/ext4/ioctl.c @@ -100,7 +100,7 @@ long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) goto flags_out; } } else if (oldflags & EXT4_EOFBLOCKS_FL) - ext4_truncate(inode); + ext4_truncate(inode, 0); handle = ext4_journal_start(inode, 1); if (IS_ERR(handle)) { diff --git a/fs/ext4/super.c b/fs/ext4/super.c index 2cf4ae0..beea7a1 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -2229,7 +2229,7 @@ static void ext4_orphan_cleanup(struct super_block *sb, __func__, inode->i_ino, inode->i_size); jbd_debug(2, "truncating inode %lu to %lld bytes\n", inode->i_ino, inode->i_size); - ext4_truncate(inode); + ext4_truncate(inode, 0); nr_truncates++; } else { ext4_msg(sb, KERN_DEBUG, diff --git a/fs/ext4/truncate.h b/fs/ext4/truncate.h index 011ba66..2be0783 100644 --- a/fs/ext4/truncate.h +++ b/fs/ext4/truncate.h @@ -11,7 +11,7 @@ static inline void ext4_truncate_failed_write(struct inode *inode) { truncate_inode_pages(inode->i_mapping, inode->i_size); - ext4_truncate(inode); + ext4_truncate(inode, 0); } /* -- 1.7.3.2