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![Jan Kara](/assets/img/avatar_default.png)
Ext4 has a filesystem wide lock protecting ext4_writepages() calls to
avoid races with switching of journalled data flag or inode format. This
lock can however cause a deadlock like:
CPU0 CPU1
ext4_writepages()
percpu_down_read(sbi->s_writepages_rwsem);
ext4_change_inode_journal_flag()
percpu_down_write(sbi->s_writepages_rwsem);
- blocks, all readers block from now on
ext4_do_writepages()
ext4_init_io_end()
kmem_cache_zalloc(io_end_cachep, GFP_KERNEL)
fs_reclaim frees dentry...
dentry_unlink_inode()
iput() - last ref =>
iput_final() - inode dirty =>
write_inode_now()...
ext4_writepages() tries to acquire sbi->s_writepages_rwsem
and blocks forever
Make sure we cannot recurse into filesystem reclaim from writeback code
to avoid the deadlock.
Reported-by: syzbot+6898da502aef574c5f8a@syzkaller.appspotmail.com
Link: https://lore.kernel.org/all/0000000000004c66b405fa108e27@google.com
Fixes: c8585c6fca
("ext4: fix races between changing inode journal mode and ext4_writepages")
CC: stable@vger.kernel.org
Signed-off-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20230504124723.20205-1-jack@suse.cz
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
671 lines
17 KiB
C
671 lines
17 KiB
C
// SPDX-License-Identifier: LGPL-2.1
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/*
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* Copyright IBM Corporation, 2007
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* Author Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
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*
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*/
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#include <linux/slab.h>
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#include "ext4_jbd2.h"
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#include "ext4_extents.h"
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/*
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* The contiguous blocks details which can be
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* represented by a single extent
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*/
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struct migrate_struct {
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ext4_lblk_t first_block, last_block, curr_block;
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ext4_fsblk_t first_pblock, last_pblock;
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};
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static int finish_range(handle_t *handle, struct inode *inode,
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struct migrate_struct *lb)
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{
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int retval = 0, needed;
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struct ext4_extent newext;
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struct ext4_ext_path *path;
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if (lb->first_pblock == 0)
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return 0;
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/* Add the extent to temp inode*/
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newext.ee_block = cpu_to_le32(lb->first_block);
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newext.ee_len = cpu_to_le16(lb->last_block - lb->first_block + 1);
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ext4_ext_store_pblock(&newext, lb->first_pblock);
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/* Locking only for convenience since we are operating on temp inode */
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down_write(&EXT4_I(inode)->i_data_sem);
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path = ext4_find_extent(inode, lb->first_block, NULL, 0);
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if (IS_ERR(path)) {
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retval = PTR_ERR(path);
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path = NULL;
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goto err_out;
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}
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/*
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* Calculate the credit needed to inserting this extent
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* Since we are doing this in loop we may accumulate extra
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* credit. But below we try to not accumulate too much
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* of them by restarting the journal.
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*/
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needed = ext4_ext_calc_credits_for_single_extent(inode,
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lb->last_block - lb->first_block + 1, path);
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retval = ext4_datasem_ensure_credits(handle, inode, needed, needed, 0);
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if (retval < 0)
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goto err_out;
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retval = ext4_ext_insert_extent(handle, inode, &path, &newext, 0);
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err_out:
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up_write((&EXT4_I(inode)->i_data_sem));
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ext4_free_ext_path(path);
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lb->first_pblock = 0;
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return retval;
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}
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static int update_extent_range(handle_t *handle, struct inode *inode,
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ext4_fsblk_t pblock, struct migrate_struct *lb)
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{
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int retval;
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/*
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* See if we can add on to the existing range (if it exists)
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*/
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if (lb->first_pblock &&
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(lb->last_pblock+1 == pblock) &&
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(lb->last_block+1 == lb->curr_block)) {
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lb->last_pblock = pblock;
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lb->last_block = lb->curr_block;
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lb->curr_block++;
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return 0;
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}
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/*
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* Start a new range.
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*/
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retval = finish_range(handle, inode, lb);
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lb->first_pblock = lb->last_pblock = pblock;
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lb->first_block = lb->last_block = lb->curr_block;
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lb->curr_block++;
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return retval;
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}
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static int update_ind_extent_range(handle_t *handle, struct inode *inode,
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ext4_fsblk_t pblock,
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struct migrate_struct *lb)
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{
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struct buffer_head *bh;
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__le32 *i_data;
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int i, retval = 0;
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unsigned long max_entries = inode->i_sb->s_blocksize >> 2;
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bh = ext4_sb_bread(inode->i_sb, pblock, 0);
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if (IS_ERR(bh))
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return PTR_ERR(bh);
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i_data = (__le32 *)bh->b_data;
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for (i = 0; i < max_entries; i++) {
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if (i_data[i]) {
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retval = update_extent_range(handle, inode,
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le32_to_cpu(i_data[i]), lb);
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if (retval)
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break;
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} else {
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lb->curr_block++;
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}
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}
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put_bh(bh);
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return retval;
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}
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static int update_dind_extent_range(handle_t *handle, struct inode *inode,
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ext4_fsblk_t pblock,
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struct migrate_struct *lb)
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{
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struct buffer_head *bh;
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__le32 *i_data;
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int i, retval = 0;
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unsigned long max_entries = inode->i_sb->s_blocksize >> 2;
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bh = ext4_sb_bread(inode->i_sb, pblock, 0);
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if (IS_ERR(bh))
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return PTR_ERR(bh);
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i_data = (__le32 *)bh->b_data;
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for (i = 0; i < max_entries; i++) {
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if (i_data[i]) {
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retval = update_ind_extent_range(handle, inode,
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le32_to_cpu(i_data[i]), lb);
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if (retval)
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break;
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} else {
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/* Only update the file block number */
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lb->curr_block += max_entries;
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}
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}
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put_bh(bh);
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return retval;
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}
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static int update_tind_extent_range(handle_t *handle, struct inode *inode,
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ext4_fsblk_t pblock,
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struct migrate_struct *lb)
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{
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struct buffer_head *bh;
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__le32 *i_data;
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int i, retval = 0;
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unsigned long max_entries = inode->i_sb->s_blocksize >> 2;
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bh = ext4_sb_bread(inode->i_sb, pblock, 0);
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if (IS_ERR(bh))
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return PTR_ERR(bh);
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i_data = (__le32 *)bh->b_data;
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for (i = 0; i < max_entries; i++) {
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if (i_data[i]) {
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retval = update_dind_extent_range(handle, inode,
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le32_to_cpu(i_data[i]), lb);
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if (retval)
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break;
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} else {
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/* Only update the file block number */
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lb->curr_block += max_entries * max_entries;
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}
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}
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put_bh(bh);
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return retval;
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}
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static int free_dind_blocks(handle_t *handle,
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struct inode *inode, __le32 i_data)
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{
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int i;
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__le32 *tmp_idata;
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struct buffer_head *bh;
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struct super_block *sb = inode->i_sb;
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unsigned long max_entries = inode->i_sb->s_blocksize >> 2;
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int err;
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bh = ext4_sb_bread(sb, le32_to_cpu(i_data), 0);
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if (IS_ERR(bh))
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return PTR_ERR(bh);
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tmp_idata = (__le32 *)bh->b_data;
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for (i = 0; i < max_entries; i++) {
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if (tmp_idata[i]) {
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err = ext4_journal_ensure_credits(handle,
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EXT4_RESERVE_TRANS_BLOCKS,
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ext4_free_metadata_revoke_credits(sb, 1));
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if (err < 0) {
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put_bh(bh);
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return err;
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}
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ext4_free_blocks(handle, inode, NULL,
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le32_to_cpu(tmp_idata[i]), 1,
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EXT4_FREE_BLOCKS_METADATA |
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EXT4_FREE_BLOCKS_FORGET);
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}
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}
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put_bh(bh);
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err = ext4_journal_ensure_credits(handle, EXT4_RESERVE_TRANS_BLOCKS,
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ext4_free_metadata_revoke_credits(sb, 1));
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if (err < 0)
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return err;
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ext4_free_blocks(handle, inode, NULL, le32_to_cpu(i_data), 1,
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EXT4_FREE_BLOCKS_METADATA |
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EXT4_FREE_BLOCKS_FORGET);
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return 0;
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}
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static int free_tind_blocks(handle_t *handle,
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struct inode *inode, __le32 i_data)
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{
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int i, retval = 0;
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__le32 *tmp_idata;
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struct buffer_head *bh;
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unsigned long max_entries = inode->i_sb->s_blocksize >> 2;
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bh = ext4_sb_bread(inode->i_sb, le32_to_cpu(i_data), 0);
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if (IS_ERR(bh))
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return PTR_ERR(bh);
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tmp_idata = (__le32 *)bh->b_data;
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for (i = 0; i < max_entries; i++) {
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if (tmp_idata[i]) {
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retval = free_dind_blocks(handle,
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inode, tmp_idata[i]);
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if (retval) {
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put_bh(bh);
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return retval;
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}
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}
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}
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put_bh(bh);
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retval = ext4_journal_ensure_credits(handle, EXT4_RESERVE_TRANS_BLOCKS,
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ext4_free_metadata_revoke_credits(inode->i_sb, 1));
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if (retval < 0)
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return retval;
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ext4_free_blocks(handle, inode, NULL, le32_to_cpu(i_data), 1,
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EXT4_FREE_BLOCKS_METADATA |
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EXT4_FREE_BLOCKS_FORGET);
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return 0;
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}
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static int free_ind_block(handle_t *handle, struct inode *inode, __le32 *i_data)
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{
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int retval;
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/* ei->i_data[EXT4_IND_BLOCK] */
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if (i_data[0]) {
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retval = ext4_journal_ensure_credits(handle,
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EXT4_RESERVE_TRANS_BLOCKS,
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ext4_free_metadata_revoke_credits(inode->i_sb, 1));
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if (retval < 0)
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return retval;
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ext4_free_blocks(handle, inode, NULL,
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le32_to_cpu(i_data[0]), 1,
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EXT4_FREE_BLOCKS_METADATA |
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EXT4_FREE_BLOCKS_FORGET);
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}
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/* ei->i_data[EXT4_DIND_BLOCK] */
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if (i_data[1]) {
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retval = free_dind_blocks(handle, inode, i_data[1]);
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if (retval)
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return retval;
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}
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/* ei->i_data[EXT4_TIND_BLOCK] */
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if (i_data[2]) {
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retval = free_tind_blocks(handle, inode, i_data[2]);
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if (retval)
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return retval;
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}
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return 0;
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}
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static int ext4_ext_swap_inode_data(handle_t *handle, struct inode *inode,
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struct inode *tmp_inode)
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{
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int retval, retval2 = 0;
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__le32 i_data[3];
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struct ext4_inode_info *ei = EXT4_I(inode);
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struct ext4_inode_info *tmp_ei = EXT4_I(tmp_inode);
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/*
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* One credit accounted for writing the
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* i_data field of the original inode
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*/
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retval = ext4_journal_ensure_credits(handle, 1, 0);
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if (retval < 0)
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goto err_out;
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i_data[0] = ei->i_data[EXT4_IND_BLOCK];
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i_data[1] = ei->i_data[EXT4_DIND_BLOCK];
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i_data[2] = ei->i_data[EXT4_TIND_BLOCK];
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down_write(&EXT4_I(inode)->i_data_sem);
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/*
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* if EXT4_STATE_EXT_MIGRATE is cleared a block allocation
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* happened after we started the migrate. We need to
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* fail the migrate
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*/
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if (!ext4_test_inode_state(inode, EXT4_STATE_EXT_MIGRATE)) {
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retval = -EAGAIN;
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up_write(&EXT4_I(inode)->i_data_sem);
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goto err_out;
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} else
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ext4_clear_inode_state(inode, EXT4_STATE_EXT_MIGRATE);
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/*
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* We have the extent map build with the tmp inode.
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* Now copy the i_data across
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*/
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ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS);
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memcpy(ei->i_data, tmp_ei->i_data, sizeof(ei->i_data));
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/*
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* Update i_blocks with the new blocks that got
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* allocated while adding extents for extent index
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* blocks.
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*
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* While converting to extents we need not
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* update the original inode i_blocks for extent blocks
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* via quota APIs. The quota update happened via tmp_inode already.
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*/
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spin_lock(&inode->i_lock);
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inode->i_blocks += tmp_inode->i_blocks;
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spin_unlock(&inode->i_lock);
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up_write(&EXT4_I(inode)->i_data_sem);
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/*
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* We mark the inode dirty after, because we decrement the
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* i_blocks when freeing the indirect meta-data blocks
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*/
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retval = free_ind_block(handle, inode, i_data);
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retval2 = ext4_mark_inode_dirty(handle, inode);
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if (unlikely(retval2 && !retval))
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retval = retval2;
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err_out:
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return retval;
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}
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static int free_ext_idx(handle_t *handle, struct inode *inode,
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struct ext4_extent_idx *ix)
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{
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int i, retval = 0;
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ext4_fsblk_t block;
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struct buffer_head *bh;
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struct ext4_extent_header *eh;
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block = ext4_idx_pblock(ix);
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bh = ext4_sb_bread(inode->i_sb, block, 0);
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if (IS_ERR(bh))
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return PTR_ERR(bh);
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eh = (struct ext4_extent_header *)bh->b_data;
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if (eh->eh_depth != 0) {
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ix = EXT_FIRST_INDEX(eh);
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for (i = 0; i < le16_to_cpu(eh->eh_entries); i++, ix++) {
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retval = free_ext_idx(handle, inode, ix);
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if (retval) {
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put_bh(bh);
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return retval;
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}
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}
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}
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put_bh(bh);
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retval = ext4_journal_ensure_credits(handle, EXT4_RESERVE_TRANS_BLOCKS,
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ext4_free_metadata_revoke_credits(inode->i_sb, 1));
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if (retval < 0)
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return retval;
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ext4_free_blocks(handle, inode, NULL, block, 1,
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EXT4_FREE_BLOCKS_METADATA | EXT4_FREE_BLOCKS_FORGET);
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return 0;
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}
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/*
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* Free the extent meta data blocks only
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*/
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static int free_ext_block(handle_t *handle, struct inode *inode)
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{
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int i, retval = 0;
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struct ext4_inode_info *ei = EXT4_I(inode);
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struct ext4_extent_header *eh = (struct ext4_extent_header *)ei->i_data;
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struct ext4_extent_idx *ix;
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if (eh->eh_depth == 0)
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/*
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* No extra blocks allocated for extent meta data
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*/
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return 0;
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ix = EXT_FIRST_INDEX(eh);
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for (i = 0; i < le16_to_cpu(eh->eh_entries); i++, ix++) {
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retval = free_ext_idx(handle, inode, ix);
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if (retval)
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return retval;
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}
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return retval;
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}
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int ext4_ext_migrate(struct inode *inode)
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{
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handle_t *handle;
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int retval = 0, i;
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__le32 *i_data;
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struct ext4_inode_info *ei;
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struct inode *tmp_inode = NULL;
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struct migrate_struct lb;
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unsigned long max_entries;
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__u32 goal, tmp_csum_seed;
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uid_t owner[2];
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int alloc_ctx;
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/*
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* If the filesystem does not support extents, or the inode
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* already is extent-based, error out.
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*/
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if (!ext4_has_feature_extents(inode->i_sb) ||
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ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS) ||
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ext4_has_inline_data(inode))
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return -EINVAL;
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if (S_ISLNK(inode->i_mode) && inode->i_blocks == 0)
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/*
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* don't migrate fast symlink
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*/
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return retval;
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alloc_ctx = ext4_writepages_down_write(inode->i_sb);
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/*
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* Worst case we can touch the allocation bitmaps and a block
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* group descriptor block. We do need to worry about
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* credits for modifying the quota inode.
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*/
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handle = ext4_journal_start(inode, EXT4_HT_MIGRATE,
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3 + EXT4_MAXQUOTAS_TRANS_BLOCKS(inode->i_sb));
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if (IS_ERR(handle)) {
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retval = PTR_ERR(handle);
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goto out_unlock;
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}
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goal = (((inode->i_ino - 1) / EXT4_INODES_PER_GROUP(inode->i_sb)) *
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EXT4_INODES_PER_GROUP(inode->i_sb)) + 1;
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owner[0] = i_uid_read(inode);
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owner[1] = i_gid_read(inode);
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tmp_inode = ext4_new_inode(handle, d_inode(inode->i_sb->s_root),
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S_IFREG, NULL, goal, owner, 0);
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if (IS_ERR(tmp_inode)) {
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retval = PTR_ERR(tmp_inode);
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ext4_journal_stop(handle);
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goto out_unlock;
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}
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/*
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* Use the correct seed for checksum (i.e. the seed from 'inode'). This
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|
* is so that the metadata blocks will have the correct checksum after
|
|
* the migration.
|
|
*/
|
|
ei = EXT4_I(inode);
|
|
tmp_csum_seed = EXT4_I(tmp_inode)->i_csum_seed;
|
|
EXT4_I(tmp_inode)->i_csum_seed = ei->i_csum_seed;
|
|
i_size_write(tmp_inode, i_size_read(inode));
|
|
/*
|
|
* Set the i_nlink to zero so it will be deleted later
|
|
* when we drop inode reference.
|
|
*/
|
|
clear_nlink(tmp_inode);
|
|
|
|
ext4_ext_tree_init(handle, tmp_inode);
|
|
ext4_journal_stop(handle);
|
|
|
|
/*
|
|
* start with one credit accounted for
|
|
* superblock modification.
|
|
*
|
|
* For the tmp_inode we already have committed the
|
|
* transaction that created the inode. Later as and
|
|
* when we add extents we extent the journal
|
|
*/
|
|
/*
|
|
* Even though we take i_rwsem we can still cause block
|
|
* allocation via mmap write to holes. If we have allocated
|
|
* new blocks we fail migrate. New block allocation will
|
|
* clear EXT4_STATE_EXT_MIGRATE flag. The flag is updated
|
|
* with i_data_sem held to prevent racing with block
|
|
* allocation.
|
|
*/
|
|
down_read(&EXT4_I(inode)->i_data_sem);
|
|
ext4_set_inode_state(inode, EXT4_STATE_EXT_MIGRATE);
|
|
up_read((&EXT4_I(inode)->i_data_sem));
|
|
|
|
handle = ext4_journal_start(inode, EXT4_HT_MIGRATE, 1);
|
|
if (IS_ERR(handle)) {
|
|
retval = PTR_ERR(handle);
|
|
goto out_tmp_inode;
|
|
}
|
|
|
|
i_data = ei->i_data;
|
|
memset(&lb, 0, sizeof(lb));
|
|
|
|
/* 32 bit block address 4 bytes */
|
|
max_entries = inode->i_sb->s_blocksize >> 2;
|
|
for (i = 0; i < EXT4_NDIR_BLOCKS; i++) {
|
|
if (i_data[i]) {
|
|
retval = update_extent_range(handle, tmp_inode,
|
|
le32_to_cpu(i_data[i]), &lb);
|
|
if (retval)
|
|
goto err_out;
|
|
} else
|
|
lb.curr_block++;
|
|
}
|
|
if (i_data[EXT4_IND_BLOCK]) {
|
|
retval = update_ind_extent_range(handle, tmp_inode,
|
|
le32_to_cpu(i_data[EXT4_IND_BLOCK]), &lb);
|
|
if (retval)
|
|
goto err_out;
|
|
} else
|
|
lb.curr_block += max_entries;
|
|
if (i_data[EXT4_DIND_BLOCK]) {
|
|
retval = update_dind_extent_range(handle, tmp_inode,
|
|
le32_to_cpu(i_data[EXT4_DIND_BLOCK]), &lb);
|
|
if (retval)
|
|
goto err_out;
|
|
} else
|
|
lb.curr_block += max_entries * max_entries;
|
|
if (i_data[EXT4_TIND_BLOCK]) {
|
|
retval = update_tind_extent_range(handle, tmp_inode,
|
|
le32_to_cpu(i_data[EXT4_TIND_BLOCK]), &lb);
|
|
if (retval)
|
|
goto err_out;
|
|
}
|
|
/*
|
|
* Build the last extent
|
|
*/
|
|
retval = finish_range(handle, tmp_inode, &lb);
|
|
err_out:
|
|
if (retval)
|
|
/*
|
|
* Failure case delete the extent information with the
|
|
* tmp_inode
|
|
*/
|
|
free_ext_block(handle, tmp_inode);
|
|
else {
|
|
retval = ext4_ext_swap_inode_data(handle, inode, tmp_inode);
|
|
if (retval)
|
|
/*
|
|
* if we fail to swap inode data free the extent
|
|
* details of the tmp inode
|
|
*/
|
|
free_ext_block(handle, tmp_inode);
|
|
}
|
|
|
|
/* We mark the tmp_inode dirty via ext4_ext_tree_init. */
|
|
retval = ext4_journal_ensure_credits(handle, 1, 0);
|
|
if (retval < 0)
|
|
goto out_stop;
|
|
/*
|
|
* Mark the tmp_inode as of size zero
|
|
*/
|
|
i_size_write(tmp_inode, 0);
|
|
|
|
/*
|
|
* set the i_blocks count to zero
|
|
* so that the ext4_evict_inode() does the
|
|
* right job
|
|
*
|
|
* We don't need to take the i_lock because
|
|
* the inode is not visible to user space.
|
|
*/
|
|
tmp_inode->i_blocks = 0;
|
|
EXT4_I(tmp_inode)->i_csum_seed = tmp_csum_seed;
|
|
|
|
/* Reset the extent details */
|
|
ext4_ext_tree_init(handle, tmp_inode);
|
|
out_stop:
|
|
ext4_journal_stop(handle);
|
|
out_tmp_inode:
|
|
unlock_new_inode(tmp_inode);
|
|
iput(tmp_inode);
|
|
out_unlock:
|
|
ext4_writepages_up_write(inode->i_sb, alloc_ctx);
|
|
return retval;
|
|
}
|
|
|
|
/*
|
|
* Migrate a simple extent-based inode to use the i_blocks[] array
|
|
*/
|
|
int ext4_ind_migrate(struct inode *inode)
|
|
{
|
|
struct ext4_extent_header *eh;
|
|
struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
|
|
struct ext4_super_block *es = sbi->s_es;
|
|
struct ext4_inode_info *ei = EXT4_I(inode);
|
|
struct ext4_extent *ex;
|
|
unsigned int i, len;
|
|
ext4_lblk_t start, end;
|
|
ext4_fsblk_t blk;
|
|
handle_t *handle;
|
|
int ret, ret2 = 0;
|
|
int alloc_ctx;
|
|
|
|
if (!ext4_has_feature_extents(inode->i_sb) ||
|
|
(!ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)))
|
|
return -EINVAL;
|
|
|
|
if (ext4_has_feature_bigalloc(inode->i_sb))
|
|
return -EOPNOTSUPP;
|
|
|
|
/*
|
|
* In order to get correct extent info, force all delayed allocation
|
|
* blocks to be allocated, otherwise delayed allocation blocks may not
|
|
* be reflected and bypass the checks on extent header.
|
|
*/
|
|
if (test_opt(inode->i_sb, DELALLOC))
|
|
ext4_alloc_da_blocks(inode);
|
|
|
|
alloc_ctx = ext4_writepages_down_write(inode->i_sb);
|
|
|
|
handle = ext4_journal_start(inode, EXT4_HT_MIGRATE, 1);
|
|
if (IS_ERR(handle)) {
|
|
ret = PTR_ERR(handle);
|
|
goto out_unlock;
|
|
}
|
|
|
|
down_write(&EXT4_I(inode)->i_data_sem);
|
|
ret = ext4_ext_check_inode(inode);
|
|
if (ret)
|
|
goto errout;
|
|
|
|
eh = ext_inode_hdr(inode);
|
|
ex = EXT_FIRST_EXTENT(eh);
|
|
if (ext4_blocks_count(es) > EXT4_MAX_BLOCK_FILE_PHYS ||
|
|
eh->eh_depth != 0 || le16_to_cpu(eh->eh_entries) > 1) {
|
|
ret = -EOPNOTSUPP;
|
|
goto errout;
|
|
}
|
|
if (eh->eh_entries == 0)
|
|
blk = len = start = end = 0;
|
|
else {
|
|
len = le16_to_cpu(ex->ee_len);
|
|
blk = ext4_ext_pblock(ex);
|
|
start = le32_to_cpu(ex->ee_block);
|
|
end = start + len - 1;
|
|
if (end >= EXT4_NDIR_BLOCKS) {
|
|
ret = -EOPNOTSUPP;
|
|
goto errout;
|
|
}
|
|
}
|
|
|
|
ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS);
|
|
memset(ei->i_data, 0, sizeof(ei->i_data));
|
|
for (i = start; i <= end; i++)
|
|
ei->i_data[i] = cpu_to_le32(blk++);
|
|
ret2 = ext4_mark_inode_dirty(handle, inode);
|
|
if (unlikely(ret2 && !ret))
|
|
ret = ret2;
|
|
errout:
|
|
ext4_journal_stop(handle);
|
|
up_write(&EXT4_I(inode)->i_data_sem);
|
|
out_unlock:
|
|
ext4_writepages_up_write(inode->i_sb, alloc_ctx);
|
|
return ret;
|
|
}
|