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![Linus Torvalds](/assets/img/avatar_default.png)
relatively obscure cornercases or races that were found using regression tests. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iQIcBAABCAAGBQJRSm5lAAoJENNvdpvBGATwZW8QAN7jMn7IaVCTXXblqgqba4uN KvLGRgK7R/n1rIhdHoxJHumwRQLTppVzjDCc8ePnWhdypzMZNuzUvs+OoCFdkDsW qf3CmL/p/R1oSiSzzFIs/7wGp7xBZ0l0BWZMFWd9EUg9cqoMBDA6KzcMF95fOtas KsjRL+BThacVldS7jyKFwE4BrpXd0Z5V9qZ6wjQPPoBx8sXF4iYA+CZVo5FUKBs8 6I82LS1/PIYCe3IOSpCgyKXQqRzAYJANv1ndken5wW8jWT2R58e360OwZEVcpIN9 /caov+F5OKfk4iOGq3b+vwRplNhAI2S6C4vhMbmS2GPWE8Fnr8gubyqNAIIs5R/y 3zYHdqZESfuEF7K3QoAepiJhi3YIoRxXC1FxD7uxx7VBRhW2w8Ij5hlXhuSoh24M MUiXgCeIxQb+ZfUx0OHV++LSOHVccU4y7Z0X+LpXQa6tEMBuSgK6yCKsGkyr8APN gPMupTptgyUE3tFaCjqc7QKtmoeRAMSvzfqEyV6DlblIOe+3f/RJzRO222Xc4kxq D9t2tOuPoXsR+ivtS5pEcrZkE4Y2hkJbJzb7XXvfoETixYsuX6VkiPK/D68S9eRe VelqTM2lHPJi/3Wkle0p4pzWpEq70D8qZVp4TKLHMJCTQKpwUfopm5lvln87lc7w 4JDORIx/ed1u8MMTJlmG =X3vc -----END PGP SIGNATURE----- Merge tag 'ext4_for_linue' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4 Pull ext4 fixes from Ted Ts'o: "Fix a number of regression and other bugs in ext4, most of which were relatively obscure cornercases or races that were found using regression tests." * tag 'ext4_for_linue' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4: (21 commits) ext4: fix data=journal fast mount/umount hang ext4: fix ext4_evict_inode() racing against workqueue processing code ext4: fix memory leakage in mext_check_coverage ext4: use s_extent_max_zeroout_kb value as number of kb ext4: use atomic64_t for the per-flexbg free_clusters count jbd2: fix use after free in jbd2_journal_dirty_metadata() ext4: reserve metadata block for every delayed write ext4: update reserved space after the 'correction' ext4: do not use yield() ext4: remove unused variable in ext4_free_blocks() ext4: fix WARN_ON from ext4_releasepage() ext4: fix the wrong number of the allocated blocks in ext4_split_extent() ext4: update extent status tree after an extent is zeroed out ext4: fix wrong m_len value after unwritten extent conversion ext4: add self-testing infrastructure to do a sanity check ext4: avoid a potential overflow in ext4_es_can_be_merged() ext4: invalidate extent status tree during extent migration ext4: remove unnecessary wait for extent conversion in ext4_fallocate() ext4: add warning to ext4_convert_unwritten_extents_endio ext4: disable merging of uninitialized extents ...
1547 lines
45 KiB
C
1547 lines
45 KiB
C
/*
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* Copyright (c) 2008,2009 NEC Software Tohoku, Ltd.
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* Written by Takashi Sato <t-sato@yk.jp.nec.com>
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* Akira Fujita <a-fujita@rs.jp.nec.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of version 2.1 of the GNU Lesser General Public License
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/fs.h>
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#include <linux/quotaops.h>
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#include <linux/slab.h>
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#include "ext4_jbd2.h"
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#include "ext4.h"
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#include "ext4_extents.h"
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/**
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* get_ext_path - Find an extent path for designated logical block number.
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*
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* @inode: an inode which is searched
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* @lblock: logical block number to find an extent path
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* @path: pointer to an extent path pointer (for output)
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*
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* ext4_ext_find_extent wrapper. Return 0 on success, or a negative error value
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* on failure.
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*/
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static inline int
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get_ext_path(struct inode *inode, ext4_lblk_t lblock,
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struct ext4_ext_path **orig_path)
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{
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int ret = 0;
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struct ext4_ext_path *path;
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path = ext4_ext_find_extent(inode, lblock, *orig_path);
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if (IS_ERR(path))
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ret = PTR_ERR(path);
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else if (path[ext_depth(inode)].p_ext == NULL)
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ret = -ENODATA;
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else
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*orig_path = path;
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return ret;
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}
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/**
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* copy_extent_status - Copy the extent's initialization status
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*
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* @src: an extent for getting initialize status
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* @dest: an extent to be set the status
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*/
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static void
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copy_extent_status(struct ext4_extent *src, struct ext4_extent *dest)
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{
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if (ext4_ext_is_uninitialized(src))
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ext4_ext_mark_uninitialized(dest);
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else
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dest->ee_len = cpu_to_le16(ext4_ext_get_actual_len(dest));
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}
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/**
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* mext_next_extent - Search for the next extent and set it to "extent"
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*
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* @inode: inode which is searched
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* @path: this will obtain data for the next extent
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* @extent: pointer to the next extent we have just gotten
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*
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* Search the next extent in the array of ext4_ext_path structure (@path)
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* and set it to ext4_extent structure (@extent). In addition, the member of
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* @path (->p_ext) also points the next extent. Return 0 on success, 1 if
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* ext4_ext_path structure refers to the last extent, or a negative error
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* value on failure.
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*/
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static int
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mext_next_extent(struct inode *inode, struct ext4_ext_path *path,
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struct ext4_extent **extent)
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{
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struct ext4_extent_header *eh;
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int ppos, leaf_ppos = path->p_depth;
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ppos = leaf_ppos;
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if (EXT_LAST_EXTENT(path[ppos].p_hdr) > path[ppos].p_ext) {
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/* leaf block */
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*extent = ++path[ppos].p_ext;
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path[ppos].p_block = ext4_ext_pblock(path[ppos].p_ext);
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return 0;
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}
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while (--ppos >= 0) {
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if (EXT_LAST_INDEX(path[ppos].p_hdr) >
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path[ppos].p_idx) {
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int cur_ppos = ppos;
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/* index block */
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path[ppos].p_idx++;
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path[ppos].p_block = ext4_idx_pblock(path[ppos].p_idx);
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if (path[ppos+1].p_bh)
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brelse(path[ppos+1].p_bh);
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path[ppos+1].p_bh =
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sb_bread(inode->i_sb, path[ppos].p_block);
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if (!path[ppos+1].p_bh)
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return -EIO;
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path[ppos+1].p_hdr =
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ext_block_hdr(path[ppos+1].p_bh);
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/* Halfway index block */
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while (++cur_ppos < leaf_ppos) {
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path[cur_ppos].p_idx =
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EXT_FIRST_INDEX(path[cur_ppos].p_hdr);
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path[cur_ppos].p_block =
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ext4_idx_pblock(path[cur_ppos].p_idx);
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if (path[cur_ppos+1].p_bh)
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brelse(path[cur_ppos+1].p_bh);
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path[cur_ppos+1].p_bh = sb_bread(inode->i_sb,
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path[cur_ppos].p_block);
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if (!path[cur_ppos+1].p_bh)
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return -EIO;
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path[cur_ppos+1].p_hdr =
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ext_block_hdr(path[cur_ppos+1].p_bh);
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}
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path[leaf_ppos].p_ext = *extent = NULL;
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eh = path[leaf_ppos].p_hdr;
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if (le16_to_cpu(eh->eh_entries) == 0)
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/* empty leaf is found */
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return -ENODATA;
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/* leaf block */
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path[leaf_ppos].p_ext = *extent =
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EXT_FIRST_EXTENT(path[leaf_ppos].p_hdr);
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path[leaf_ppos].p_block =
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ext4_ext_pblock(path[leaf_ppos].p_ext);
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return 0;
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}
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}
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/* We found the last extent */
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return 1;
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}
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/**
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* double_down_write_data_sem - Acquire two inodes' write lock of i_data_sem
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*
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* Acquire write lock of i_data_sem of the two inodes
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*/
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static void
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double_down_write_data_sem(struct inode *first, struct inode *second)
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{
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if (first < second) {
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down_write(&EXT4_I(first)->i_data_sem);
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down_write_nested(&EXT4_I(second)->i_data_sem, SINGLE_DEPTH_NESTING);
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} else {
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down_write(&EXT4_I(second)->i_data_sem);
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down_write_nested(&EXT4_I(first)->i_data_sem, SINGLE_DEPTH_NESTING);
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}
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}
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/**
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* double_up_write_data_sem - Release two inodes' write lock of i_data_sem
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*
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* @orig_inode: original inode structure to be released its lock first
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* @donor_inode: donor inode structure to be released its lock second
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* Release write lock of i_data_sem of two inodes (orig and donor).
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*/
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static void
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double_up_write_data_sem(struct inode *orig_inode, struct inode *donor_inode)
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{
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up_write(&EXT4_I(orig_inode)->i_data_sem);
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up_write(&EXT4_I(donor_inode)->i_data_sem);
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}
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/**
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* mext_insert_across_blocks - Insert extents across leaf block
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*
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* @handle: journal handle
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* @orig_inode: original inode
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* @o_start: first original extent to be changed
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* @o_end: last original extent to be changed
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* @start_ext: first new extent to be inserted
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* @new_ext: middle of new extent to be inserted
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* @end_ext: last new extent to be inserted
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*
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* Allocate a new leaf block and insert extents into it. Return 0 on success,
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* or a negative error value on failure.
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*/
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static int
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mext_insert_across_blocks(handle_t *handle, struct inode *orig_inode,
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struct ext4_extent *o_start, struct ext4_extent *o_end,
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struct ext4_extent *start_ext, struct ext4_extent *new_ext,
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struct ext4_extent *end_ext)
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{
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struct ext4_ext_path *orig_path = NULL;
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ext4_lblk_t eblock = 0;
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int new_flag = 0;
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int end_flag = 0;
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int err = 0;
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if (start_ext->ee_len && new_ext->ee_len && end_ext->ee_len) {
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if (o_start == o_end) {
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/* start_ext new_ext end_ext
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* donor |---------|-----------|--------|
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* orig |------------------------------|
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*/
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end_flag = 1;
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} else {
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/* start_ext new_ext end_ext
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* donor |---------|----------|---------|
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* orig |---------------|--------------|
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*/
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o_end->ee_block = end_ext->ee_block;
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o_end->ee_len = end_ext->ee_len;
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ext4_ext_store_pblock(o_end, ext4_ext_pblock(end_ext));
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}
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o_start->ee_len = start_ext->ee_len;
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eblock = le32_to_cpu(start_ext->ee_block);
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new_flag = 1;
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} else if (start_ext->ee_len && new_ext->ee_len &&
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!end_ext->ee_len && o_start == o_end) {
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/* start_ext new_ext
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* donor |--------------|---------------|
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* orig |------------------------------|
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*/
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o_start->ee_len = start_ext->ee_len;
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eblock = le32_to_cpu(start_ext->ee_block);
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new_flag = 1;
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} else if (!start_ext->ee_len && new_ext->ee_len &&
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end_ext->ee_len && o_start == o_end) {
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/* new_ext end_ext
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* donor |--------------|---------------|
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* orig |------------------------------|
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*/
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o_end->ee_block = end_ext->ee_block;
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o_end->ee_len = end_ext->ee_len;
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ext4_ext_store_pblock(o_end, ext4_ext_pblock(end_ext));
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/*
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* Set 0 to the extent block if new_ext was
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* the first block.
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*/
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if (new_ext->ee_block)
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eblock = le32_to_cpu(new_ext->ee_block);
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new_flag = 1;
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} else {
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ext4_debug("ext4 move extent: Unexpected insert case\n");
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return -EIO;
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}
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if (new_flag) {
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err = get_ext_path(orig_inode, eblock, &orig_path);
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if (err)
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goto out;
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if (ext4_ext_insert_extent(handle, orig_inode,
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orig_path, new_ext, 0))
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goto out;
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}
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if (end_flag) {
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err = get_ext_path(orig_inode,
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le32_to_cpu(end_ext->ee_block) - 1, &orig_path);
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if (err)
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goto out;
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if (ext4_ext_insert_extent(handle, orig_inode,
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orig_path, end_ext, 0))
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goto out;
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}
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out:
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if (orig_path) {
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ext4_ext_drop_refs(orig_path);
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kfree(orig_path);
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}
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return err;
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}
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/**
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* mext_insert_inside_block - Insert new extent to the extent block
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*
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* @o_start: first original extent to be moved
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* @o_end: last original extent to be moved
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* @start_ext: first new extent to be inserted
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* @new_ext: middle of new extent to be inserted
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* @end_ext: last new extent to be inserted
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* @eh: extent header of target leaf block
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* @range_to_move: used to decide how to insert extent
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*
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* Insert extents into the leaf block. The extent (@o_start) is overwritten
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* by inserted extents.
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*/
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static void
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mext_insert_inside_block(struct ext4_extent *o_start,
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struct ext4_extent *o_end,
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struct ext4_extent *start_ext,
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struct ext4_extent *new_ext,
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struct ext4_extent *end_ext,
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struct ext4_extent_header *eh,
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int range_to_move)
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{
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int i = 0;
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unsigned long len;
|
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/* Move the existing extents */
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if (range_to_move && o_end < EXT_LAST_EXTENT(eh)) {
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len = (unsigned long)(EXT_LAST_EXTENT(eh) + 1) -
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(unsigned long)(o_end + 1);
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memmove(o_end + 1 + range_to_move, o_end + 1, len);
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}
|
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/* Insert start entry */
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if (start_ext->ee_len)
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o_start[i++].ee_len = start_ext->ee_len;
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/* Insert new entry */
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if (new_ext->ee_len) {
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o_start[i] = *new_ext;
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ext4_ext_store_pblock(&o_start[i++], ext4_ext_pblock(new_ext));
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}
|
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/* Insert end entry */
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if (end_ext->ee_len)
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o_start[i] = *end_ext;
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|
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/* Increment the total entries counter on the extent block */
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le16_add_cpu(&eh->eh_entries, range_to_move);
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}
|
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|
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/**
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* mext_insert_extents - Insert new extent
|
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*
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* @handle: journal handle
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* @orig_inode: original inode
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* @orig_path: path indicates first extent to be changed
|
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* @o_start: first original extent to be changed
|
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* @o_end: last original extent to be changed
|
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* @start_ext: first new extent to be inserted
|
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* @new_ext: middle of new extent to be inserted
|
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* @end_ext: last new extent to be inserted
|
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*
|
|
* Call the function to insert extents. If we cannot add more extents into
|
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* the leaf block, we call mext_insert_across_blocks() to create a
|
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* new leaf block. Otherwise call mext_insert_inside_block(). Return 0
|
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* on success, or a negative error value on failure.
|
|
*/
|
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static int
|
|
mext_insert_extents(handle_t *handle, struct inode *orig_inode,
|
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struct ext4_ext_path *orig_path,
|
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struct ext4_extent *o_start,
|
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struct ext4_extent *o_end,
|
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struct ext4_extent *start_ext,
|
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struct ext4_extent *new_ext,
|
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struct ext4_extent *end_ext)
|
|
{
|
|
struct ext4_extent_header *eh;
|
|
unsigned long need_slots, slots_range;
|
|
int range_to_move, depth, ret;
|
|
|
|
/*
|
|
* The extents need to be inserted
|
|
* start_extent + new_extent + end_extent.
|
|
*/
|
|
need_slots = (start_ext->ee_len ? 1 : 0) + (end_ext->ee_len ? 1 : 0) +
|
|
(new_ext->ee_len ? 1 : 0);
|
|
|
|
/* The number of slots between start and end */
|
|
slots_range = ((unsigned long)(o_end + 1) - (unsigned long)o_start + 1)
|
|
/ sizeof(struct ext4_extent);
|
|
|
|
/* Range to move the end of extent */
|
|
range_to_move = need_slots - slots_range;
|
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depth = orig_path->p_depth;
|
|
orig_path += depth;
|
|
eh = orig_path->p_hdr;
|
|
|
|
if (depth) {
|
|
/* Register to journal */
|
|
ret = ext4_journal_get_write_access(handle, orig_path->p_bh);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
/* Expansion */
|
|
if (range_to_move > 0 &&
|
|
(range_to_move > le16_to_cpu(eh->eh_max)
|
|
- le16_to_cpu(eh->eh_entries))) {
|
|
|
|
ret = mext_insert_across_blocks(handle, orig_inode, o_start,
|
|
o_end, start_ext, new_ext, end_ext);
|
|
if (ret < 0)
|
|
return ret;
|
|
} else
|
|
mext_insert_inside_block(o_start, o_end, start_ext, new_ext,
|
|
end_ext, eh, range_to_move);
|
|
|
|
if (depth) {
|
|
ret = ext4_handle_dirty_metadata(handle, orig_inode,
|
|
orig_path->p_bh);
|
|
if (ret)
|
|
return ret;
|
|
} else {
|
|
ret = ext4_mark_inode_dirty(handle, orig_inode);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* mext_leaf_block - Move one leaf extent block into the inode.
|
|
*
|
|
* @handle: journal handle
|
|
* @orig_inode: original inode
|
|
* @orig_path: path indicates first extent to be changed
|
|
* @dext: donor extent
|
|
* @from: start offset on the target file
|
|
*
|
|
* In order to insert extents into the leaf block, we must divide the extent
|
|
* in the leaf block into three extents. The one is located to be inserted
|
|
* extents, and the others are located around it.
|
|
*
|
|
* Therefore, this function creates structures to save extents of the leaf
|
|
* block, and inserts extents by calling mext_insert_extents() with
|
|
* created extents. Return 0 on success, or a negative error value on failure.
|
|
*/
|
|
static int
|
|
mext_leaf_block(handle_t *handle, struct inode *orig_inode,
|
|
struct ext4_ext_path *orig_path, struct ext4_extent *dext,
|
|
ext4_lblk_t *from)
|
|
{
|
|
struct ext4_extent *oext, *o_start, *o_end, *prev_ext;
|
|
struct ext4_extent new_ext, start_ext, end_ext;
|
|
ext4_lblk_t new_ext_end;
|
|
int oext_alen, new_ext_alen, end_ext_alen;
|
|
int depth = ext_depth(orig_inode);
|
|
int ret;
|
|
|
|
start_ext.ee_block = end_ext.ee_block = 0;
|
|
o_start = o_end = oext = orig_path[depth].p_ext;
|
|
oext_alen = ext4_ext_get_actual_len(oext);
|
|
start_ext.ee_len = end_ext.ee_len = 0;
|
|
|
|
new_ext.ee_block = cpu_to_le32(*from);
|
|
ext4_ext_store_pblock(&new_ext, ext4_ext_pblock(dext));
|
|
new_ext.ee_len = dext->ee_len;
|
|
new_ext_alen = ext4_ext_get_actual_len(&new_ext);
|
|
new_ext_end = le32_to_cpu(new_ext.ee_block) + new_ext_alen - 1;
|
|
|
|
/*
|
|
* Case: original extent is first
|
|
* oext |--------|
|
|
* new_ext |--|
|
|
* start_ext |--|
|
|
*/
|
|
if (le32_to_cpu(oext->ee_block) < le32_to_cpu(new_ext.ee_block) &&
|
|
le32_to_cpu(new_ext.ee_block) <
|
|
le32_to_cpu(oext->ee_block) + oext_alen) {
|
|
start_ext.ee_len = cpu_to_le16(le32_to_cpu(new_ext.ee_block) -
|
|
le32_to_cpu(oext->ee_block));
|
|
start_ext.ee_block = oext->ee_block;
|
|
copy_extent_status(oext, &start_ext);
|
|
} else if (oext > EXT_FIRST_EXTENT(orig_path[depth].p_hdr)) {
|
|
prev_ext = oext - 1;
|
|
/*
|
|
* We can merge new_ext into previous extent,
|
|
* if these are contiguous and same extent type.
|
|
*/
|
|
if (ext4_can_extents_be_merged(orig_inode, prev_ext,
|
|
&new_ext)) {
|
|
o_start = prev_ext;
|
|
start_ext.ee_len = cpu_to_le16(
|
|
ext4_ext_get_actual_len(prev_ext) +
|
|
new_ext_alen);
|
|
start_ext.ee_block = oext->ee_block;
|
|
copy_extent_status(prev_ext, &start_ext);
|
|
new_ext.ee_len = 0;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Case: new_ext_end must be less than oext
|
|
* oext |-----------|
|
|
* new_ext |-------|
|
|
*/
|
|
if (le32_to_cpu(oext->ee_block) + oext_alen - 1 < new_ext_end) {
|
|
EXT4_ERROR_INODE(orig_inode,
|
|
"new_ext_end(%u) should be less than or equal to "
|
|
"oext->ee_block(%u) + oext_alen(%d) - 1",
|
|
new_ext_end, le32_to_cpu(oext->ee_block),
|
|
oext_alen);
|
|
ret = -EIO;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Case: new_ext is smaller than original extent
|
|
* oext |---------------|
|
|
* new_ext |-----------|
|
|
* end_ext |---|
|
|
*/
|
|
if (le32_to_cpu(oext->ee_block) <= new_ext_end &&
|
|
new_ext_end < le32_to_cpu(oext->ee_block) + oext_alen - 1) {
|
|
end_ext.ee_len =
|
|
cpu_to_le16(le32_to_cpu(oext->ee_block) +
|
|
oext_alen - 1 - new_ext_end);
|
|
copy_extent_status(oext, &end_ext);
|
|
end_ext_alen = ext4_ext_get_actual_len(&end_ext);
|
|
ext4_ext_store_pblock(&end_ext,
|
|
(ext4_ext_pblock(o_end) + oext_alen - end_ext_alen));
|
|
end_ext.ee_block =
|
|
cpu_to_le32(le32_to_cpu(o_end->ee_block) +
|
|
oext_alen - end_ext_alen);
|
|
}
|
|
|
|
ret = mext_insert_extents(handle, orig_inode, orig_path, o_start,
|
|
o_end, &start_ext, &new_ext, &end_ext);
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* mext_calc_swap_extents - Calculate extents for extent swapping.
|
|
*
|
|
* @tmp_dext: the extent that will belong to the original inode
|
|
* @tmp_oext: the extent that will belong to the donor inode
|
|
* @orig_off: block offset of original inode
|
|
* @donor_off: block offset of donor inode
|
|
* @max_count: the maximum length of extents
|
|
*
|
|
* Return 0 on success, or a negative error value on failure.
|
|
*/
|
|
static int
|
|
mext_calc_swap_extents(struct ext4_extent *tmp_dext,
|
|
struct ext4_extent *tmp_oext,
|
|
ext4_lblk_t orig_off, ext4_lblk_t donor_off,
|
|
ext4_lblk_t max_count)
|
|
{
|
|
ext4_lblk_t diff, orig_diff;
|
|
struct ext4_extent dext_old, oext_old;
|
|
|
|
BUG_ON(orig_off != donor_off);
|
|
|
|
/* original and donor extents have to cover the same block offset */
|
|
if (orig_off < le32_to_cpu(tmp_oext->ee_block) ||
|
|
le32_to_cpu(tmp_oext->ee_block) +
|
|
ext4_ext_get_actual_len(tmp_oext) - 1 < orig_off)
|
|
return -ENODATA;
|
|
|
|
if (orig_off < le32_to_cpu(tmp_dext->ee_block) ||
|
|
le32_to_cpu(tmp_dext->ee_block) +
|
|
ext4_ext_get_actual_len(tmp_dext) - 1 < orig_off)
|
|
return -ENODATA;
|
|
|
|
dext_old = *tmp_dext;
|
|
oext_old = *tmp_oext;
|
|
|
|
/* When tmp_dext is too large, pick up the target range. */
|
|
diff = donor_off - le32_to_cpu(tmp_dext->ee_block);
|
|
|
|
ext4_ext_store_pblock(tmp_dext, ext4_ext_pblock(tmp_dext) + diff);
|
|
le32_add_cpu(&tmp_dext->ee_block, diff);
|
|
le16_add_cpu(&tmp_dext->ee_len, -diff);
|
|
|
|
if (max_count < ext4_ext_get_actual_len(tmp_dext))
|
|
tmp_dext->ee_len = cpu_to_le16(max_count);
|
|
|
|
orig_diff = orig_off - le32_to_cpu(tmp_oext->ee_block);
|
|
ext4_ext_store_pblock(tmp_oext, ext4_ext_pblock(tmp_oext) + orig_diff);
|
|
|
|
/* Adjust extent length if donor extent is larger than orig */
|
|
if (ext4_ext_get_actual_len(tmp_dext) >
|
|
ext4_ext_get_actual_len(tmp_oext) - orig_diff)
|
|
tmp_dext->ee_len = cpu_to_le16(le16_to_cpu(tmp_oext->ee_len) -
|
|
orig_diff);
|
|
|
|
tmp_oext->ee_len = cpu_to_le16(ext4_ext_get_actual_len(tmp_dext));
|
|
|
|
copy_extent_status(&oext_old, tmp_dext);
|
|
copy_extent_status(&dext_old, tmp_oext);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* mext_check_coverage - Check that all extents in range has the same type
|
|
*
|
|
* @inode: inode in question
|
|
* @from: block offset of inode
|
|
* @count: block count to be checked
|
|
* @uninit: extents expected to be uninitialized
|
|
* @err: pointer to save error value
|
|
*
|
|
* Return 1 if all extents in range has expected type, and zero otherwise.
|
|
*/
|
|
static int
|
|
mext_check_coverage(struct inode *inode, ext4_lblk_t from, ext4_lblk_t count,
|
|
int uninit, int *err)
|
|
{
|
|
struct ext4_ext_path *path = NULL;
|
|
struct ext4_extent *ext;
|
|
int ret = 0;
|
|
ext4_lblk_t last = from + count;
|
|
while (from < last) {
|
|
*err = get_ext_path(inode, from, &path);
|
|
if (*err)
|
|
goto out;
|
|
ext = path[ext_depth(inode)].p_ext;
|
|
if (uninit != ext4_ext_is_uninitialized(ext))
|
|
goto out;
|
|
from += ext4_ext_get_actual_len(ext);
|
|
ext4_ext_drop_refs(path);
|
|
}
|
|
ret = 1;
|
|
out:
|
|
if (path) {
|
|
ext4_ext_drop_refs(path);
|
|
kfree(path);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* mext_replace_branches - Replace original extents with new extents
|
|
*
|
|
* @handle: journal handle
|
|
* @orig_inode: original inode
|
|
* @donor_inode: donor inode
|
|
* @from: block offset of orig_inode
|
|
* @count: block count to be replaced
|
|
* @err: pointer to save return value
|
|
*
|
|
* Replace original inode extents and donor inode extents page by page.
|
|
* We implement this replacement in the following three steps:
|
|
* 1. Save the block information of original and donor inodes into
|
|
* dummy extents.
|
|
* 2. Change the block information of original inode to point at the
|
|
* donor inode blocks.
|
|
* 3. Change the block information of donor inode to point at the saved
|
|
* original inode blocks in the dummy extents.
|
|
*
|
|
* Return replaced block count.
|
|
*/
|
|
static int
|
|
mext_replace_branches(handle_t *handle, struct inode *orig_inode,
|
|
struct inode *donor_inode, ext4_lblk_t from,
|
|
ext4_lblk_t count, int *err)
|
|
{
|
|
struct ext4_ext_path *orig_path = NULL;
|
|
struct ext4_ext_path *donor_path = NULL;
|
|
struct ext4_extent *oext, *dext;
|
|
struct ext4_extent tmp_dext, tmp_oext;
|
|
ext4_lblk_t orig_off = from, donor_off = from;
|
|
int depth;
|
|
int replaced_count = 0;
|
|
int dext_alen;
|
|
|
|
*err = ext4_es_remove_extent(orig_inode, from, count);
|
|
if (*err)
|
|
goto out;
|
|
|
|
*err = ext4_es_remove_extent(donor_inode, from, count);
|
|
if (*err)
|
|
goto out;
|
|
|
|
/* Get the original extent for the block "orig_off" */
|
|
*err = get_ext_path(orig_inode, orig_off, &orig_path);
|
|
if (*err)
|
|
goto out;
|
|
|
|
/* Get the donor extent for the head */
|
|
*err = get_ext_path(donor_inode, donor_off, &donor_path);
|
|
if (*err)
|
|
goto out;
|
|
depth = ext_depth(orig_inode);
|
|
oext = orig_path[depth].p_ext;
|
|
tmp_oext = *oext;
|
|
|
|
depth = ext_depth(donor_inode);
|
|
dext = donor_path[depth].p_ext;
|
|
if (unlikely(!dext))
|
|
goto missing_donor_extent;
|
|
tmp_dext = *dext;
|
|
|
|
*err = mext_calc_swap_extents(&tmp_dext, &tmp_oext, orig_off,
|
|
donor_off, count);
|
|
if (*err)
|
|
goto out;
|
|
|
|
/* Loop for the donor extents */
|
|
while (1) {
|
|
/* The extent for donor must be found. */
|
|
if (unlikely(!dext)) {
|
|
missing_donor_extent:
|
|
EXT4_ERROR_INODE(donor_inode,
|
|
"The extent for donor must be found");
|
|
*err = -EIO;
|
|
goto out;
|
|
} else if (donor_off != le32_to_cpu(tmp_dext.ee_block)) {
|
|
EXT4_ERROR_INODE(donor_inode,
|
|
"Donor offset(%u) and the first block of donor "
|
|
"extent(%u) should be equal",
|
|
donor_off,
|
|
le32_to_cpu(tmp_dext.ee_block));
|
|
*err = -EIO;
|
|
goto out;
|
|
}
|
|
|
|
/* Set donor extent to orig extent */
|
|
*err = mext_leaf_block(handle, orig_inode,
|
|
orig_path, &tmp_dext, &orig_off);
|
|
if (*err)
|
|
goto out;
|
|
|
|
/* Set orig extent to donor extent */
|
|
*err = mext_leaf_block(handle, donor_inode,
|
|
donor_path, &tmp_oext, &donor_off);
|
|
if (*err)
|
|
goto out;
|
|
|
|
dext_alen = ext4_ext_get_actual_len(&tmp_dext);
|
|
replaced_count += dext_alen;
|
|
donor_off += dext_alen;
|
|
orig_off += dext_alen;
|
|
|
|
/* Already moved the expected blocks */
|
|
if (replaced_count >= count)
|
|
break;
|
|
|
|
if (orig_path)
|
|
ext4_ext_drop_refs(orig_path);
|
|
*err = get_ext_path(orig_inode, orig_off, &orig_path);
|
|
if (*err)
|
|
goto out;
|
|
depth = ext_depth(orig_inode);
|
|
oext = orig_path[depth].p_ext;
|
|
tmp_oext = *oext;
|
|
|
|
if (donor_path)
|
|
ext4_ext_drop_refs(donor_path);
|
|
*err = get_ext_path(donor_inode, donor_off, &donor_path);
|
|
if (*err)
|
|
goto out;
|
|
depth = ext_depth(donor_inode);
|
|
dext = donor_path[depth].p_ext;
|
|
tmp_dext = *dext;
|
|
|
|
*err = mext_calc_swap_extents(&tmp_dext, &tmp_oext, orig_off,
|
|
donor_off, count - replaced_count);
|
|
if (*err)
|
|
goto out;
|
|
}
|
|
|
|
out:
|
|
if (orig_path) {
|
|
ext4_ext_drop_refs(orig_path);
|
|
kfree(orig_path);
|
|
}
|
|
if (donor_path) {
|
|
ext4_ext_drop_refs(donor_path);
|
|
kfree(donor_path);
|
|
}
|
|
|
|
return replaced_count;
|
|
}
|
|
|
|
/**
|
|
* mext_page_double_lock - Grab and lock pages on both @inode1 and @inode2
|
|
*
|
|
* @inode1: the inode structure
|
|
* @inode2: the inode structure
|
|
* @index: page index
|
|
* @page: result page vector
|
|
*
|
|
* Grab two locked pages for inode's by inode order
|
|
*/
|
|
static int
|
|
mext_page_double_lock(struct inode *inode1, struct inode *inode2,
|
|
pgoff_t index, struct page *page[2])
|
|
{
|
|
struct address_space *mapping[2];
|
|
unsigned fl = AOP_FLAG_NOFS;
|
|
|
|
BUG_ON(!inode1 || !inode2);
|
|
if (inode1 < inode2) {
|
|
mapping[0] = inode1->i_mapping;
|
|
mapping[1] = inode2->i_mapping;
|
|
} else {
|
|
mapping[0] = inode2->i_mapping;
|
|
mapping[1] = inode1->i_mapping;
|
|
}
|
|
|
|
page[0] = grab_cache_page_write_begin(mapping[0], index, fl);
|
|
if (!page[0])
|
|
return -ENOMEM;
|
|
|
|
page[1] = grab_cache_page_write_begin(mapping[1], index, fl);
|
|
if (!page[1]) {
|
|
unlock_page(page[0]);
|
|
page_cache_release(page[0]);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
if (inode1 > inode2) {
|
|
struct page *tmp;
|
|
tmp = page[0];
|
|
page[0] = page[1];
|
|
page[1] = tmp;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* Force page buffers uptodate w/o dropping page's lock */
|
|
static int
|
|
mext_page_mkuptodate(struct page *page, unsigned from, unsigned to)
|
|
{
|
|
struct inode *inode = page->mapping->host;
|
|
sector_t block;
|
|
struct buffer_head *bh, *head, *arr[MAX_BUF_PER_PAGE];
|
|
unsigned int blocksize, block_start, block_end;
|
|
int i, err, nr = 0, partial = 0;
|
|
BUG_ON(!PageLocked(page));
|
|
BUG_ON(PageWriteback(page));
|
|
|
|
if (PageUptodate(page))
|
|
return 0;
|
|
|
|
blocksize = 1 << inode->i_blkbits;
|
|
if (!page_has_buffers(page))
|
|
create_empty_buffers(page, blocksize, 0);
|
|
|
|
head = page_buffers(page);
|
|
block = (sector_t)page->index << (PAGE_CACHE_SHIFT - inode->i_blkbits);
|
|
for (bh = head, block_start = 0; bh != head || !block_start;
|
|
block++, block_start = block_end, bh = bh->b_this_page) {
|
|
block_end = block_start + blocksize;
|
|
if (block_end <= from || block_start >= to) {
|
|
if (!buffer_uptodate(bh))
|
|
partial = 1;
|
|
continue;
|
|
}
|
|
if (buffer_uptodate(bh))
|
|
continue;
|
|
if (!buffer_mapped(bh)) {
|
|
int err = 0;
|
|
err = ext4_get_block(inode, block, bh, 0);
|
|
if (err) {
|
|
SetPageError(page);
|
|
return err;
|
|
}
|
|
if (!buffer_mapped(bh)) {
|
|
zero_user(page, block_start, blocksize);
|
|
if (!err)
|
|
set_buffer_uptodate(bh);
|
|
continue;
|
|
}
|
|
}
|
|
BUG_ON(nr >= MAX_BUF_PER_PAGE);
|
|
arr[nr++] = bh;
|
|
}
|
|
/* No io required */
|
|
if (!nr)
|
|
goto out;
|
|
|
|
for (i = 0; i < nr; i++) {
|
|
bh = arr[i];
|
|
if (!bh_uptodate_or_lock(bh)) {
|
|
err = bh_submit_read(bh);
|
|
if (err)
|
|
return err;
|
|
}
|
|
}
|
|
out:
|
|
if (!partial)
|
|
SetPageUptodate(page);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* move_extent_per_page - Move extent data per page
|
|
*
|
|
* @o_filp: file structure of original file
|
|
* @donor_inode: donor inode
|
|
* @orig_page_offset: page index on original file
|
|
* @data_offset_in_page: block index where data swapping starts
|
|
* @block_len_in_page: the number of blocks to be swapped
|
|
* @uninit: orig extent is uninitialized or not
|
|
* @err: pointer to save return value
|
|
*
|
|
* Save the data in original inode blocks and replace original inode extents
|
|
* with donor inode extents by calling mext_replace_branches().
|
|
* Finally, write out the saved data in new original inode blocks. Return
|
|
* replaced block count.
|
|
*/
|
|
static int
|
|
move_extent_per_page(struct file *o_filp, struct inode *donor_inode,
|
|
pgoff_t orig_page_offset, int data_offset_in_page,
|
|
int block_len_in_page, int uninit, int *err)
|
|
{
|
|
struct inode *orig_inode = file_inode(o_filp);
|
|
struct page *pagep[2] = {NULL, NULL};
|
|
handle_t *handle;
|
|
ext4_lblk_t orig_blk_offset;
|
|
long long offs = orig_page_offset << PAGE_CACHE_SHIFT;
|
|
unsigned long blocksize = orig_inode->i_sb->s_blocksize;
|
|
unsigned int w_flags = 0;
|
|
unsigned int tmp_data_size, data_size, replaced_size;
|
|
int err2, jblocks, retries = 0;
|
|
int replaced_count = 0;
|
|
int from = data_offset_in_page << orig_inode->i_blkbits;
|
|
int blocks_per_page = PAGE_CACHE_SIZE >> orig_inode->i_blkbits;
|
|
|
|
/*
|
|
* It needs twice the amount of ordinary journal buffers because
|
|
* inode and donor_inode may change each different metadata blocks.
|
|
*/
|
|
again:
|
|
*err = 0;
|
|
jblocks = ext4_writepage_trans_blocks(orig_inode) * 2;
|
|
handle = ext4_journal_start(orig_inode, EXT4_HT_MOVE_EXTENTS, jblocks);
|
|
if (IS_ERR(handle)) {
|
|
*err = PTR_ERR(handle);
|
|
return 0;
|
|
}
|
|
|
|
if (segment_eq(get_fs(), KERNEL_DS))
|
|
w_flags |= AOP_FLAG_UNINTERRUPTIBLE;
|
|
|
|
orig_blk_offset = orig_page_offset * blocks_per_page +
|
|
data_offset_in_page;
|
|
|
|
offs = (long long)orig_blk_offset << orig_inode->i_blkbits;
|
|
|
|
/* Calculate data_size */
|
|
if ((orig_blk_offset + block_len_in_page - 1) ==
|
|
((orig_inode->i_size - 1) >> orig_inode->i_blkbits)) {
|
|
/* Replace the last block */
|
|
tmp_data_size = orig_inode->i_size & (blocksize - 1);
|
|
/*
|
|
* If data_size equal zero, it shows data_size is multiples of
|
|
* blocksize. So we set appropriate value.
|
|
*/
|
|
if (tmp_data_size == 0)
|
|
tmp_data_size = blocksize;
|
|
|
|
data_size = tmp_data_size +
|
|
((block_len_in_page - 1) << orig_inode->i_blkbits);
|
|
} else
|
|
data_size = block_len_in_page << orig_inode->i_blkbits;
|
|
|
|
replaced_size = data_size;
|
|
|
|
*err = mext_page_double_lock(orig_inode, donor_inode, orig_page_offset,
|
|
pagep);
|
|
if (unlikely(*err < 0))
|
|
goto stop_journal;
|
|
/*
|
|
* If orig extent was uninitialized it can become initialized
|
|
* at any time after i_data_sem was dropped, in order to
|
|
* serialize with delalloc we have recheck extent while we
|
|
* hold page's lock, if it is still the case data copy is not
|
|
* necessary, just swap data blocks between orig and donor.
|
|
*/
|
|
if (uninit) {
|
|
double_down_write_data_sem(orig_inode, donor_inode);
|
|
/* If any of extents in range became initialized we have to
|
|
* fallback to data copying */
|
|
uninit = mext_check_coverage(orig_inode, orig_blk_offset,
|
|
block_len_in_page, 1, err);
|
|
if (*err)
|
|
goto drop_data_sem;
|
|
|
|
uninit &= mext_check_coverage(donor_inode, orig_blk_offset,
|
|
block_len_in_page, 1, err);
|
|
if (*err)
|
|
goto drop_data_sem;
|
|
|
|
if (!uninit) {
|
|
double_up_write_data_sem(orig_inode, donor_inode);
|
|
goto data_copy;
|
|
}
|
|
if ((page_has_private(pagep[0]) &&
|
|
!try_to_release_page(pagep[0], 0)) ||
|
|
(page_has_private(pagep[1]) &&
|
|
!try_to_release_page(pagep[1], 0))) {
|
|
*err = -EBUSY;
|
|
goto drop_data_sem;
|
|
}
|
|
replaced_count = mext_replace_branches(handle, orig_inode,
|
|
donor_inode, orig_blk_offset,
|
|
block_len_in_page, err);
|
|
drop_data_sem:
|
|
double_up_write_data_sem(orig_inode, donor_inode);
|
|
goto unlock_pages;
|
|
}
|
|
data_copy:
|
|
*err = mext_page_mkuptodate(pagep[0], from, from + replaced_size);
|
|
if (*err)
|
|
goto unlock_pages;
|
|
|
|
/* At this point all buffers in range are uptodate, old mapping layout
|
|
* is no longer required, try to drop it now. */
|
|
if ((page_has_private(pagep[0]) && !try_to_release_page(pagep[0], 0)) ||
|
|
(page_has_private(pagep[1]) && !try_to_release_page(pagep[1], 0))) {
|
|
*err = -EBUSY;
|
|
goto unlock_pages;
|
|
}
|
|
|
|
replaced_count = mext_replace_branches(handle, orig_inode, donor_inode,
|
|
orig_blk_offset,
|
|
block_len_in_page, err);
|
|
if (*err) {
|
|
if (replaced_count) {
|
|
block_len_in_page = replaced_count;
|
|
replaced_size =
|
|
block_len_in_page << orig_inode->i_blkbits;
|
|
} else
|
|
goto unlock_pages;
|
|
}
|
|
/* Perform all necessary steps similar write_begin()/write_end()
|
|
* but keeping in mind that i_size will not change */
|
|
*err = __block_write_begin(pagep[0], from, from + replaced_size,
|
|
ext4_get_block);
|
|
if (!*err)
|
|
*err = block_commit_write(pagep[0], from, from + replaced_size);
|
|
|
|
if (unlikely(*err < 0))
|
|
goto repair_branches;
|
|
|
|
/* Even in case of data=writeback it is reasonable to pin
|
|
* inode to transaction, to prevent unexpected data loss */
|
|
*err = ext4_jbd2_file_inode(handle, orig_inode);
|
|
|
|
unlock_pages:
|
|
unlock_page(pagep[0]);
|
|
page_cache_release(pagep[0]);
|
|
unlock_page(pagep[1]);
|
|
page_cache_release(pagep[1]);
|
|
stop_journal:
|
|
ext4_journal_stop(handle);
|
|
/* Buffer was busy because probably is pinned to journal transaction,
|
|
* force transaction commit may help to free it. */
|
|
if (*err == -EBUSY && ext4_should_retry_alloc(orig_inode->i_sb,
|
|
&retries))
|
|
goto again;
|
|
return replaced_count;
|
|
|
|
repair_branches:
|
|
/*
|
|
* This should never ever happen!
|
|
* Extents are swapped already, but we are not able to copy data.
|
|
* Try to swap extents to it's original places
|
|
*/
|
|
double_down_write_data_sem(orig_inode, donor_inode);
|
|
replaced_count = mext_replace_branches(handle, donor_inode, orig_inode,
|
|
orig_blk_offset,
|
|
block_len_in_page, &err2);
|
|
double_up_write_data_sem(orig_inode, donor_inode);
|
|
if (replaced_count != block_len_in_page) {
|
|
EXT4_ERROR_INODE_BLOCK(orig_inode, (sector_t)(orig_blk_offset),
|
|
"Unable to copy data block,"
|
|
" data will be lost.");
|
|
*err = -EIO;
|
|
}
|
|
replaced_count = 0;
|
|
goto unlock_pages;
|
|
}
|
|
|
|
/**
|
|
* mext_check_arguments - Check whether move extent can be done
|
|
*
|
|
* @orig_inode: original inode
|
|
* @donor_inode: donor inode
|
|
* @orig_start: logical start offset in block for orig
|
|
* @donor_start: logical start offset in block for donor
|
|
* @len: the number of blocks to be moved
|
|
*
|
|
* Check the arguments of ext4_move_extents() whether the files can be
|
|
* exchanged with each other.
|
|
* Return 0 on success, or a negative error value on failure.
|
|
*/
|
|
static int
|
|
mext_check_arguments(struct inode *orig_inode,
|
|
struct inode *donor_inode, __u64 orig_start,
|
|
__u64 donor_start, __u64 *len)
|
|
{
|
|
ext4_lblk_t orig_blocks, donor_blocks;
|
|
unsigned int blkbits = orig_inode->i_blkbits;
|
|
unsigned int blocksize = 1 << blkbits;
|
|
|
|
if (donor_inode->i_mode & (S_ISUID|S_ISGID)) {
|
|
ext4_debug("ext4 move extent: suid or sgid is set"
|
|
" to donor file [ino:orig %lu, donor %lu]\n",
|
|
orig_inode->i_ino, donor_inode->i_ino);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (IS_IMMUTABLE(donor_inode) || IS_APPEND(donor_inode))
|
|
return -EPERM;
|
|
|
|
/* Ext4 move extent does not support swapfile */
|
|
if (IS_SWAPFILE(orig_inode) || IS_SWAPFILE(donor_inode)) {
|
|
ext4_debug("ext4 move extent: The argument files should "
|
|
"not be swapfile [ino:orig %lu, donor %lu]\n",
|
|
orig_inode->i_ino, donor_inode->i_ino);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Ext4 move extent supports only extent based file */
|
|
if (!(ext4_test_inode_flag(orig_inode, EXT4_INODE_EXTENTS))) {
|
|
ext4_debug("ext4 move extent: orig file is not extents "
|
|
"based file [ino:orig %lu]\n", orig_inode->i_ino);
|
|
return -EOPNOTSUPP;
|
|
} else if (!(ext4_test_inode_flag(donor_inode, EXT4_INODE_EXTENTS))) {
|
|
ext4_debug("ext4 move extent: donor file is not extents "
|
|
"based file [ino:donor %lu]\n", donor_inode->i_ino);
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
if ((!orig_inode->i_size) || (!donor_inode->i_size)) {
|
|
ext4_debug("ext4 move extent: File size is 0 byte\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Start offset should be same */
|
|
if (orig_start != donor_start) {
|
|
ext4_debug("ext4 move extent: orig and donor's start "
|
|
"offset are not same [ino:orig %lu, donor %lu]\n",
|
|
orig_inode->i_ino, donor_inode->i_ino);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if ((orig_start >= EXT_MAX_BLOCKS) ||
|
|
(*len > EXT_MAX_BLOCKS) ||
|
|
(orig_start + *len >= EXT_MAX_BLOCKS)) {
|
|
ext4_debug("ext4 move extent: Can't handle over [%u] blocks "
|
|
"[ino:orig %lu, donor %lu]\n", EXT_MAX_BLOCKS,
|
|
orig_inode->i_ino, donor_inode->i_ino);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (orig_inode->i_size > donor_inode->i_size) {
|
|
donor_blocks = (donor_inode->i_size + blocksize - 1) >> blkbits;
|
|
/* TODO: eliminate this artificial restriction */
|
|
if (orig_start >= donor_blocks) {
|
|
ext4_debug("ext4 move extent: orig start offset "
|
|
"[%llu] should be less than donor file blocks "
|
|
"[%u] [ino:orig %lu, donor %lu]\n",
|
|
orig_start, donor_blocks,
|
|
orig_inode->i_ino, donor_inode->i_ino);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* TODO: eliminate this artificial restriction */
|
|
if (orig_start + *len > donor_blocks) {
|
|
ext4_debug("ext4 move extent: End offset [%llu] should "
|
|
"be less than donor file blocks [%u]."
|
|
"So adjust length from %llu to %llu "
|
|
"[ino:orig %lu, donor %lu]\n",
|
|
orig_start + *len, donor_blocks,
|
|
*len, donor_blocks - orig_start,
|
|
orig_inode->i_ino, donor_inode->i_ino);
|
|
*len = donor_blocks - orig_start;
|
|
}
|
|
} else {
|
|
orig_blocks = (orig_inode->i_size + blocksize - 1) >> blkbits;
|
|
if (orig_start >= orig_blocks) {
|
|
ext4_debug("ext4 move extent: start offset [%llu] "
|
|
"should be less than original file blocks "
|
|
"[%u] [ino:orig %lu, donor %lu]\n",
|
|
orig_start, orig_blocks,
|
|
orig_inode->i_ino, donor_inode->i_ino);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (orig_start + *len > orig_blocks) {
|
|
ext4_debug("ext4 move extent: Adjust length "
|
|
"from %llu to %llu. Because it should be "
|
|
"less than original file blocks "
|
|
"[ino:orig %lu, donor %lu]\n",
|
|
*len, orig_blocks - orig_start,
|
|
orig_inode->i_ino, donor_inode->i_ino);
|
|
*len = orig_blocks - orig_start;
|
|
}
|
|
}
|
|
|
|
if (!*len) {
|
|
ext4_debug("ext4 move extent: len should not be 0 "
|
|
"[ino:orig %lu, donor %lu]\n", orig_inode->i_ino,
|
|
donor_inode->i_ino);
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* mext_inode_double_lock - Lock i_mutex on both @inode1 and @inode2
|
|
*
|
|
* @inode1: the inode structure
|
|
* @inode2: the inode structure
|
|
*
|
|
* Lock two inodes' i_mutex
|
|
*/
|
|
static void
|
|
mext_inode_double_lock(struct inode *inode1, struct inode *inode2)
|
|
{
|
|
BUG_ON(inode1 == inode2);
|
|
if (inode1 < inode2) {
|
|
mutex_lock_nested(&inode1->i_mutex, I_MUTEX_PARENT);
|
|
mutex_lock_nested(&inode2->i_mutex, I_MUTEX_CHILD);
|
|
} else {
|
|
mutex_lock_nested(&inode2->i_mutex, I_MUTEX_PARENT);
|
|
mutex_lock_nested(&inode1->i_mutex, I_MUTEX_CHILD);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* mext_inode_double_unlock - Release i_mutex on both @inode1 and @inode2
|
|
*
|
|
* @inode1: the inode that is released first
|
|
* @inode2: the inode that is released second
|
|
*
|
|
*/
|
|
|
|
static void
|
|
mext_inode_double_unlock(struct inode *inode1, struct inode *inode2)
|
|
{
|
|
mutex_unlock(&inode1->i_mutex);
|
|
mutex_unlock(&inode2->i_mutex);
|
|
}
|
|
|
|
/**
|
|
* ext4_move_extents - Exchange the specified range of a file
|
|
*
|
|
* @o_filp: file structure of the original file
|
|
* @d_filp: file structure of the donor file
|
|
* @orig_start: start offset in block for orig
|
|
* @donor_start: start offset in block for donor
|
|
* @len: the number of blocks to be moved
|
|
* @moved_len: moved block length
|
|
*
|
|
* This function returns 0 and moved block length is set in moved_len
|
|
* if succeed, otherwise returns error value.
|
|
*
|
|
* Note: ext4_move_extents() proceeds the following order.
|
|
* 1:ext4_move_extents() calculates the last block number of moving extent
|
|
* function by the start block number (orig_start) and the number of blocks
|
|
* to be moved (len) specified as arguments.
|
|
* If the {orig, donor}_start points a hole, the extent's start offset
|
|
* pointed by ext_cur (current extent), holecheck_path, orig_path are set
|
|
* after hole behind.
|
|
* 2:Continue step 3 to step 5, until the holecheck_path points to last_extent
|
|
* or the ext_cur exceeds the block_end which is last logical block number.
|
|
* 3:To get the length of continues area, call mext_next_extent()
|
|
* specified with the ext_cur (initial value is holecheck_path) re-cursive,
|
|
* until find un-continuous extent, the start logical block number exceeds
|
|
* the block_end or the extent points to the last extent.
|
|
* 4:Exchange the original inode data with donor inode data
|
|
* from orig_page_offset to seq_end_page.
|
|
* The start indexes of data are specified as arguments.
|
|
* That of the original inode is orig_page_offset,
|
|
* and the donor inode is also orig_page_offset
|
|
* (To easily handle blocksize != pagesize case, the offset for the
|
|
* donor inode is block unit).
|
|
* 5:Update holecheck_path and orig_path to points a next proceeding extent,
|
|
* then returns to step 2.
|
|
* 6:Release holecheck_path, orig_path and set the len to moved_len
|
|
* which shows the number of moved blocks.
|
|
* The moved_len is useful for the command to calculate the file offset
|
|
* for starting next move extent ioctl.
|
|
* 7:Return 0 on success, or a negative error value on failure.
|
|
*/
|
|
int
|
|
ext4_move_extents(struct file *o_filp, struct file *d_filp,
|
|
__u64 orig_start, __u64 donor_start, __u64 len,
|
|
__u64 *moved_len)
|
|
{
|
|
struct inode *orig_inode = file_inode(o_filp);
|
|
struct inode *donor_inode = file_inode(d_filp);
|
|
struct ext4_ext_path *orig_path = NULL, *holecheck_path = NULL;
|
|
struct ext4_extent *ext_prev, *ext_cur, *ext_dummy;
|
|
ext4_lblk_t block_start = orig_start;
|
|
ext4_lblk_t block_end, seq_start, add_blocks, file_end, seq_blocks = 0;
|
|
ext4_lblk_t rest_blocks;
|
|
pgoff_t orig_page_offset = 0, seq_end_page;
|
|
int ret, depth, last_extent = 0;
|
|
int blocks_per_page = PAGE_CACHE_SIZE >> orig_inode->i_blkbits;
|
|
int data_offset_in_page;
|
|
int block_len_in_page;
|
|
int uninit;
|
|
|
|
if (orig_inode->i_sb != donor_inode->i_sb) {
|
|
ext4_debug("ext4 move extent: The argument files "
|
|
"should be in same FS [ino:orig %lu, donor %lu]\n",
|
|
orig_inode->i_ino, donor_inode->i_ino);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* orig and donor should be different inodes */
|
|
if (orig_inode == donor_inode) {
|
|
ext4_debug("ext4 move extent: The argument files should not "
|
|
"be same inode [ino:orig %lu, donor %lu]\n",
|
|
orig_inode->i_ino, donor_inode->i_ino);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Regular file check */
|
|
if (!S_ISREG(orig_inode->i_mode) || !S_ISREG(donor_inode->i_mode)) {
|
|
ext4_debug("ext4 move extent: The argument files should be "
|
|
"regular file [ino:orig %lu, donor %lu]\n",
|
|
orig_inode->i_ino, donor_inode->i_ino);
|
|
return -EINVAL;
|
|
}
|
|
/* TODO: This is non obvious task to swap blocks for inodes with full
|
|
jornaling enabled */
|
|
if (ext4_should_journal_data(orig_inode) ||
|
|
ext4_should_journal_data(donor_inode)) {
|
|
return -EINVAL;
|
|
}
|
|
/* Protect orig and donor inodes against a truncate */
|
|
mext_inode_double_lock(orig_inode, donor_inode);
|
|
|
|
/* Wait for all existing dio workers */
|
|
ext4_inode_block_unlocked_dio(orig_inode);
|
|
ext4_inode_block_unlocked_dio(donor_inode);
|
|
inode_dio_wait(orig_inode);
|
|
inode_dio_wait(donor_inode);
|
|
|
|
/* Protect extent tree against block allocations via delalloc */
|
|
double_down_write_data_sem(orig_inode, donor_inode);
|
|
/* Check the filesystem environment whether move_extent can be done */
|
|
ret = mext_check_arguments(orig_inode, donor_inode, orig_start,
|
|
donor_start, &len);
|
|
if (ret)
|
|
goto out;
|
|
|
|
file_end = (i_size_read(orig_inode) - 1) >> orig_inode->i_blkbits;
|
|
block_end = block_start + len - 1;
|
|
if (file_end < block_end)
|
|
len -= block_end - file_end;
|
|
|
|
ret = get_ext_path(orig_inode, block_start, &orig_path);
|
|
if (ret)
|
|
goto out;
|
|
|
|
/* Get path structure to check the hole */
|
|
ret = get_ext_path(orig_inode, block_start, &holecheck_path);
|
|
if (ret)
|
|
goto out;
|
|
|
|
depth = ext_depth(orig_inode);
|
|
ext_cur = holecheck_path[depth].p_ext;
|
|
|
|
/*
|
|
* Get proper starting location of block replacement if block_start was
|
|
* within the hole.
|
|
*/
|
|
if (le32_to_cpu(ext_cur->ee_block) +
|
|
ext4_ext_get_actual_len(ext_cur) - 1 < block_start) {
|
|
/*
|
|
* The hole exists between extents or the tail of
|
|
* original file.
|
|
*/
|
|
last_extent = mext_next_extent(orig_inode,
|
|
holecheck_path, &ext_cur);
|
|
if (last_extent < 0) {
|
|
ret = last_extent;
|
|
goto out;
|
|
}
|
|
last_extent = mext_next_extent(orig_inode, orig_path,
|
|
&ext_dummy);
|
|
if (last_extent < 0) {
|
|
ret = last_extent;
|
|
goto out;
|
|
}
|
|
seq_start = le32_to_cpu(ext_cur->ee_block);
|
|
} else if (le32_to_cpu(ext_cur->ee_block) > block_start)
|
|
/* The hole exists at the beginning of original file. */
|
|
seq_start = le32_to_cpu(ext_cur->ee_block);
|
|
else
|
|
seq_start = block_start;
|
|
|
|
/* No blocks within the specified range. */
|
|
if (le32_to_cpu(ext_cur->ee_block) > block_end) {
|
|
ext4_debug("ext4 move extent: The specified range of file "
|
|
"may be the hole\n");
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
/* Adjust start blocks */
|
|
add_blocks = min(le32_to_cpu(ext_cur->ee_block) +
|
|
ext4_ext_get_actual_len(ext_cur), block_end + 1) -
|
|
max(le32_to_cpu(ext_cur->ee_block), block_start);
|
|
|
|
while (!last_extent && le32_to_cpu(ext_cur->ee_block) <= block_end) {
|
|
seq_blocks += add_blocks;
|
|
|
|
/* Adjust tail blocks */
|
|
if (seq_start + seq_blocks - 1 > block_end)
|
|
seq_blocks = block_end - seq_start + 1;
|
|
|
|
ext_prev = ext_cur;
|
|
last_extent = mext_next_extent(orig_inode, holecheck_path,
|
|
&ext_cur);
|
|
if (last_extent < 0) {
|
|
ret = last_extent;
|
|
break;
|
|
}
|
|
add_blocks = ext4_ext_get_actual_len(ext_cur);
|
|
|
|
/*
|
|
* Extend the length of contiguous block (seq_blocks)
|
|
* if extents are contiguous.
|
|
*/
|
|
if (ext4_can_extents_be_merged(orig_inode,
|
|
ext_prev, ext_cur) &&
|
|
block_end >= le32_to_cpu(ext_cur->ee_block) &&
|
|
!last_extent)
|
|
continue;
|
|
|
|
/* Is original extent is uninitialized */
|
|
uninit = ext4_ext_is_uninitialized(ext_prev);
|
|
|
|
data_offset_in_page = seq_start % blocks_per_page;
|
|
|
|
/*
|
|
* Calculate data blocks count that should be swapped
|
|
* at the first page.
|
|
*/
|
|
if (data_offset_in_page + seq_blocks > blocks_per_page) {
|
|
/* Swapped blocks are across pages */
|
|
block_len_in_page =
|
|
blocks_per_page - data_offset_in_page;
|
|
} else {
|
|
/* Swapped blocks are in a page */
|
|
block_len_in_page = seq_blocks;
|
|
}
|
|
|
|
orig_page_offset = seq_start >>
|
|
(PAGE_CACHE_SHIFT - orig_inode->i_blkbits);
|
|
seq_end_page = (seq_start + seq_blocks - 1) >>
|
|
(PAGE_CACHE_SHIFT - orig_inode->i_blkbits);
|
|
seq_start = le32_to_cpu(ext_cur->ee_block);
|
|
rest_blocks = seq_blocks;
|
|
|
|
/*
|
|
* Up semaphore to avoid following problems:
|
|
* a. transaction deadlock among ext4_journal_start,
|
|
* ->write_begin via pagefault, and jbd2_journal_commit
|
|
* b. racing with ->readpage, ->write_begin, and ext4_get_block
|
|
* in move_extent_per_page
|
|
*/
|
|
double_up_write_data_sem(orig_inode, donor_inode);
|
|
|
|
while (orig_page_offset <= seq_end_page) {
|
|
|
|
/* Swap original branches with new branches */
|
|
block_len_in_page = move_extent_per_page(
|
|
o_filp, donor_inode,
|
|
orig_page_offset,
|
|
data_offset_in_page,
|
|
block_len_in_page, uninit,
|
|
&ret);
|
|
|
|
/* Count how many blocks we have exchanged */
|
|
*moved_len += block_len_in_page;
|
|
if (ret < 0)
|
|
break;
|
|
if (*moved_len > len) {
|
|
EXT4_ERROR_INODE(orig_inode,
|
|
"We replaced blocks too much! "
|
|
"sum of replaced: %llu requested: %llu",
|
|
*moved_len, len);
|
|
ret = -EIO;
|
|
break;
|
|
}
|
|
|
|
orig_page_offset++;
|
|
data_offset_in_page = 0;
|
|
rest_blocks -= block_len_in_page;
|
|
if (rest_blocks > blocks_per_page)
|
|
block_len_in_page = blocks_per_page;
|
|
else
|
|
block_len_in_page = rest_blocks;
|
|
}
|
|
|
|
double_down_write_data_sem(orig_inode, donor_inode);
|
|
if (ret < 0)
|
|
break;
|
|
|
|
/* Decrease buffer counter */
|
|
if (holecheck_path)
|
|
ext4_ext_drop_refs(holecheck_path);
|
|
ret = get_ext_path(orig_inode, seq_start, &holecheck_path);
|
|
if (ret)
|
|
break;
|
|
depth = holecheck_path->p_depth;
|
|
|
|
/* Decrease buffer counter */
|
|
if (orig_path)
|
|
ext4_ext_drop_refs(orig_path);
|
|
ret = get_ext_path(orig_inode, seq_start, &orig_path);
|
|
if (ret)
|
|
break;
|
|
|
|
ext_cur = holecheck_path[depth].p_ext;
|
|
add_blocks = ext4_ext_get_actual_len(ext_cur);
|
|
seq_blocks = 0;
|
|
|
|
}
|
|
out:
|
|
if (*moved_len) {
|
|
ext4_discard_preallocations(orig_inode);
|
|
ext4_discard_preallocations(donor_inode);
|
|
}
|
|
|
|
if (orig_path) {
|
|
ext4_ext_drop_refs(orig_path);
|
|
kfree(orig_path);
|
|
}
|
|
if (holecheck_path) {
|
|
ext4_ext_drop_refs(holecheck_path);
|
|
kfree(holecheck_path);
|
|
}
|
|
double_up_write_data_sem(orig_inode, donor_inode);
|
|
ext4_inode_resume_unlocked_dio(orig_inode);
|
|
ext4_inode_resume_unlocked_dio(donor_inode);
|
|
mext_inode_double_unlock(orig_inode, donor_inode);
|
|
|
|
return ret;
|
|
}
|