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![Jan Kara](/assets/img/avatar_default.png)
Commite360c6ed72
("ext4: Drop special handling of journalled data from ext4_sync_file()") simplified ext4_sync_file() by dropping special handling of journalled data mode as it was not needed anymore. However that branch was also used for directories and symlinks and since the fastcommit code does not track metadata changes to non-regular files, the change has caused e.g. fsync(2) on directories to not commit transaction as it should. Fix the problem by adding handling for non-regular files. Fixes:e360c6ed72
("ext4: Drop special handling of journalled data from ext4_sync_file()") Reported-by: Eric Whitney <enwlinux@gmail.com> Link: https://lore.kernel.org/all/ZFqO3xVnmhL7zv1x@debian-BULLSEYE-live-builder-AMD64 Signed-off-by: Jan Kara <jack@suse.cz> Tested-by: Eric Whitney <enwlinux@gmail.com> Link: https://lore.kernel.org/r/20230524104453.8734-1-jack@suse.cz Signed-off-by: Theodore Ts'o <tytso@mit.edu>
183 lines
4.9 KiB
C
183 lines
4.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* linux/fs/ext4/fsync.c
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*
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* Copyright (C) 1993 Stephen Tweedie (sct@redhat.com)
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* from
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* Copyright (C) 1992 Remy Card (card@masi.ibp.fr)
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* Laboratoire MASI - Institut Blaise Pascal
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* Universite Pierre et Marie Curie (Paris VI)
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* from
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* linux/fs/minix/truncate.c Copyright (C) 1991, 1992 Linus Torvalds
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*
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* ext4fs fsync primitive
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*
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* Big-endian to little-endian byte-swapping/bitmaps by
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* David S. Miller (davem@caip.rutgers.edu), 1995
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*
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* Removed unnecessary code duplication for little endian machines
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* and excessive __inline__s.
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* Andi Kleen, 1997
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*
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* Major simplications and cleanup - we only need to do the metadata, because
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* we can depend on generic_block_fdatasync() to sync the data blocks.
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*/
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#include <linux/time.h>
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#include <linux/fs.h>
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#include <linux/sched.h>
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#include <linux/writeback.h>
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#include <linux/blkdev.h>
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#include "ext4.h"
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#include "ext4_jbd2.h"
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#include <trace/events/ext4.h>
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/*
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* If we're not journaling and this is a just-created file, we have to
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* sync our parent directory (if it was freshly created) since
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* otherwise it will only be written by writeback, leaving a huge
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* window during which a crash may lose the file. This may apply for
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* the parent directory's parent as well, and so on recursively, if
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* they are also freshly created.
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*/
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static int ext4_sync_parent(struct inode *inode)
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{
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struct dentry *dentry, *next;
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int ret = 0;
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if (!ext4_test_inode_state(inode, EXT4_STATE_NEWENTRY))
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return 0;
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dentry = d_find_any_alias(inode);
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if (!dentry)
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return 0;
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while (ext4_test_inode_state(inode, EXT4_STATE_NEWENTRY)) {
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ext4_clear_inode_state(inode, EXT4_STATE_NEWENTRY);
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next = dget_parent(dentry);
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dput(dentry);
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dentry = next;
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inode = dentry->d_inode;
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/*
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* The directory inode may have gone through rmdir by now. But
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* the inode itself and its blocks are still allocated (we hold
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* a reference to the inode via its dentry), so it didn't go
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* through ext4_evict_inode()) and so we are safe to flush
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* metadata blocks and the inode.
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*/
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ret = sync_mapping_buffers(inode->i_mapping);
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if (ret)
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break;
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ret = sync_inode_metadata(inode, 1);
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if (ret)
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break;
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}
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dput(dentry);
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return ret;
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}
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static int ext4_fsync_nojournal(struct inode *inode, bool datasync,
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bool *needs_barrier)
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{
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int ret, err;
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ret = sync_mapping_buffers(inode->i_mapping);
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if (!(inode->i_state & I_DIRTY_ALL))
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return ret;
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if (datasync && !(inode->i_state & I_DIRTY_DATASYNC))
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return ret;
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err = sync_inode_metadata(inode, 1);
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if (!ret)
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ret = err;
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if (!ret)
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ret = ext4_sync_parent(inode);
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if (test_opt(inode->i_sb, BARRIER))
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*needs_barrier = true;
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return ret;
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}
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static int ext4_fsync_journal(struct inode *inode, bool datasync,
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bool *needs_barrier)
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{
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struct ext4_inode_info *ei = EXT4_I(inode);
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journal_t *journal = EXT4_SB(inode->i_sb)->s_journal;
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tid_t commit_tid = datasync ? ei->i_datasync_tid : ei->i_sync_tid;
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/*
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* Fastcommit does not really support fsync on directories or other
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* special files. Force a full commit.
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*/
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if (!S_ISREG(inode->i_mode))
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return ext4_force_commit(inode->i_sb);
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if (journal->j_flags & JBD2_BARRIER &&
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!jbd2_trans_will_send_data_barrier(journal, commit_tid))
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*needs_barrier = true;
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return ext4_fc_commit(journal, commit_tid);
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}
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/*
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* akpm: A new design for ext4_sync_file().
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*
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* This is only called from sys_fsync(), sys_fdatasync() and sys_msync().
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* There cannot be a transaction open by this task.
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* Another task could have dirtied this inode. Its data can be in any
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* state in the journalling system.
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*
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* What we do is just kick off a commit and wait on it. This will snapshot the
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* inode to disk.
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*/
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int ext4_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
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{
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int ret = 0, err;
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bool needs_barrier = false;
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struct inode *inode = file->f_mapping->host;
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struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
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if (unlikely(ext4_forced_shutdown(sbi)))
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return -EIO;
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ASSERT(ext4_journal_current_handle() == NULL);
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trace_ext4_sync_file_enter(file, datasync);
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if (sb_rdonly(inode->i_sb)) {
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/* Make sure that we read updated s_mount_flags value */
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smp_rmb();
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if (ext4_test_mount_flag(inode->i_sb, EXT4_MF_FS_ABORTED))
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ret = -EROFS;
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goto out;
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}
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ret = file_write_and_wait_range(file, start, end);
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if (ret)
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goto out;
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/*
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* The caller's filemap_fdatawrite()/wait will sync the data.
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* Metadata is in the journal, we wait for proper transaction to
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* commit here.
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*/
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if (!sbi->s_journal)
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ret = ext4_fsync_nojournal(inode, datasync, &needs_barrier);
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else
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ret = ext4_fsync_journal(inode, datasync, &needs_barrier);
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if (needs_barrier) {
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err = blkdev_issue_flush(inode->i_sb->s_bdev);
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if (!ret)
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ret = err;
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}
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out:
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err = file_check_and_advance_wb_err(file);
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if (ret == 0)
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ret = err;
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trace_ext4_sync_file_exit(inode, ret);
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return ret;
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}
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