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![Ye Bin](/assets/img/avatar_default.png)
Syzkaller report issue as follows: EXT4-fs (loop0): Free/Dirty block details EXT4-fs (loop0): free_blocks=0 EXT4-fs (loop0): dirty_blocks=0 EXT4-fs (loop0): Block reservation details EXT4-fs (loop0): i_reserved_data_blocks=0 EXT4-fs warning (device loop0): ext4_da_release_space:1527: ext4_da_release_space: ino 18, to_free 1 with only 0 reserved data blocks ------------[ cut here ]------------ WARNING: CPU: 0 PID: 92 at fs/ext4/inode.c:1528 ext4_da_release_space+0x25e/0x370 fs/ext4/inode.c:1524 Modules linked in: CPU: 0 PID: 92 Comm: kworker/u4:4 Not tainted 6.0.0-syzkaller-09423-g493ffd6605b2 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022 Workqueue: writeback wb_workfn (flush-7:0) RIP: 0010:ext4_da_release_space+0x25e/0x370 fs/ext4/inode.c:1528 RSP: 0018:ffffc900015f6c90 EFLAGS: 00010296 RAX: 42215896cd52ea00 RBX: 0000000000000000 RCX: 42215896cd52ea00 RDX: 0000000000000000 RSI: 0000000080000001 RDI: 0000000000000000 RBP: 1ffff1100e907d96 R08: ffffffff816aa79d R09: fffff520002bece5 R10: fffff520002bece5 R11: 1ffff920002bece4 R12: ffff888021fd2000 R13: ffff88807483ecb0 R14: 0000000000000001 R15: ffff88807483e740 FS: 0000000000000000(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005555569ba628 CR3: 000000000c88e000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> ext4_es_remove_extent+0x1ab/0x260 fs/ext4/extents_status.c:1461 mpage_release_unused_pages+0x24d/0xef0 fs/ext4/inode.c:1589 ext4_writepages+0x12eb/0x3be0 fs/ext4/inode.c:2852 do_writepages+0x3c3/0x680 mm/page-writeback.c:2469 __writeback_single_inode+0xd1/0x670 fs/fs-writeback.c:1587 writeback_sb_inodes+0xb3b/0x18f0 fs/fs-writeback.c:1870 wb_writeback+0x41f/0x7b0 fs/fs-writeback.c:2044 wb_do_writeback fs/fs-writeback.c:2187 [inline] wb_workfn+0x3cb/0xef0 fs/fs-writeback.c:2227 process_one_work+0x877/0xdb0 kernel/workqueue.c:2289 worker_thread+0xb14/0x1330 kernel/workqueue.c:2436 kthread+0x266/0x300 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 </TASK> Above issue may happens as follows: ext4_da_write_begin ext4_create_inline_data ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS); ext4_set_inode_flag(inode, EXT4_INODE_INLINE_DATA); __ext4_ioctl ext4_ext_migrate -> will lead to eh->eh_entries not zero, and set extent flag ext4_da_write_begin ext4_da_convert_inline_data_to_extent ext4_da_write_inline_data_begin ext4_da_map_blocks ext4_insert_delayed_block if (!ext4_es_scan_clu(inode, &ext4_es_is_delonly, lblk)) if (!ext4_es_scan_clu(inode, &ext4_es_is_mapped, lblk)) ext4_clu_mapped(inode, EXT4_B2C(sbi, lblk)); -> will return 1 allocated = true; ext4_es_insert_delayed_block(inode, lblk, allocated); ext4_writepages mpage_map_and_submit_extent(handle, &mpd, &give_up_on_write); -> return -ENOSPC mpage_release_unused_pages(&mpd, give_up_on_write); -> give_up_on_write == 1 ext4_es_remove_extent ext4_da_release_space(inode, reserved); if (unlikely(to_free > ei->i_reserved_data_blocks)) -> to_free == 1 but ei->i_reserved_data_blocks == 0 -> then trigger warning as above To solve above issue, forbid inode do migrate which has inline data. Cc: stable@kernel.org Reported-by: syzbot+c740bb18df70ad00952e@syzkaller.appspotmail.com Signed-off-by: Ye Bin <yebin10@huawei.com> Reviewed-by: Jan Kara <jack@suse.cz> Link: https://lore.kernel.org/r/20221018022701.683489-1-yebin10@huawei.com Signed-off-by: Theodore Ts'o <tytso@mit.edu>
670 lines
17 KiB
C
670 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;
|
|
}
|
|
|
|
int ext4_ext_migrate(struct inode *inode)
|
|
{
|
|
struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
|
|
handle_t *handle;
|
|
int retval = 0, i;
|
|
__le32 *i_data;
|
|
struct ext4_inode_info *ei;
|
|
struct inode *tmp_inode = NULL;
|
|
struct migrate_struct lb;
|
|
unsigned long max_entries;
|
|
__u32 goal, tmp_csum_seed;
|
|
uid_t owner[2];
|
|
|
|
/*
|
|
* If the filesystem does not support extents, or the inode
|
|
* already is extent-based, error out.
|
|
*/
|
|
if (!ext4_has_feature_extents(inode->i_sb) ||
|
|
ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS) ||
|
|
ext4_has_inline_data(inode))
|
|
return -EINVAL;
|
|
|
|
if (S_ISLNK(inode->i_mode) && inode->i_blocks == 0)
|
|
/*
|
|
* don't migrate fast symlink
|
|
*/
|
|
return retval;
|
|
|
|
percpu_down_write(&sbi->s_writepages_rwsem);
|
|
|
|
/*
|
|
* Worst case we can touch the allocation bitmaps and a block
|
|
* group descriptor block. We do need to worry about
|
|
* credits for modifying the quota inode.
|
|
*/
|
|
handle = ext4_journal_start(inode, EXT4_HT_MIGRATE,
|
|
3 + EXT4_MAXQUOTAS_TRANS_BLOCKS(inode->i_sb));
|
|
|
|
if (IS_ERR(handle)) {
|
|
retval = PTR_ERR(handle);
|
|
goto out_unlock;
|
|
}
|
|
goal = (((inode->i_ino - 1) / EXT4_INODES_PER_GROUP(inode->i_sb)) *
|
|
EXT4_INODES_PER_GROUP(inode->i_sb)) + 1;
|
|
owner[0] = i_uid_read(inode);
|
|
owner[1] = i_gid_read(inode);
|
|
tmp_inode = ext4_new_inode(handle, d_inode(inode->i_sb->s_root),
|
|
S_IFREG, NULL, goal, owner, 0);
|
|
if (IS_ERR(tmp_inode)) {
|
|
retval = PTR_ERR(tmp_inode);
|
|
ext4_journal_stop(handle);
|
|
goto out_unlock;
|
|
}
|
|
/*
|
|
* Use the correct seed for checksum (i.e. the seed from 'inode'). This
|
|
* 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:
|
|
percpu_up_write(&sbi->s_writepages_rwsem);
|
|
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;
|
|
|
|
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);
|
|
|
|
percpu_down_write(&sbi->s_writepages_rwsem);
|
|
|
|
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:
|
|
percpu_up_write(&sbi->s_writepages_rwsem);
|
|
return ret;
|
|
}
|