[PATCH 4.9 51/71] ext4: check for shutdown and r/o file system in ext4_write_inode()

From: Greg Kroah-Hartman
Date: Mon Jan 07 2019 - 08:08:28 EST


4.9-stable review patch. If anyone has any objections, please let me know.

------------------

From: Theodore Ts'o <tytso@xxxxxxx>

commit 18f2c4fcebf2582f96cbd5f2238f4f354a0e4847 upstream.

If the file system has been shut down or is read-only, then
ext4_write_inode() needs to bail out early.

Also use jbd2_complete_transaction() instead of ext4_force_commit() so
we only force a commit if it is needed.

Signed-off-by: Theodore Ts'o <tytso@xxxxxxx>
Cc: stable@xxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
fs/ext4/inode.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)

--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -5014,9 +5014,13 @@ int ext4_write_inode(struct inode *inode
{
int err;

- if (WARN_ON_ONCE(current->flags & PF_MEMALLOC))
+ if (WARN_ON_ONCE(current->flags & PF_MEMALLOC) ||
+ sb_rdonly(inode->i_sb))
return 0;

+ if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
+ return -EIO;
+
if (EXT4_SB(inode->i_sb)->s_journal) {
if (ext4_journal_current_handle()) {
jbd_debug(1, "called recursively, non-PF_MEMALLOC!\n");
@@ -5032,7 +5036,8 @@ int ext4_write_inode(struct inode *inode
if (wbc->sync_mode != WB_SYNC_ALL || wbc->for_sync)
return 0;

- err = ext4_force_commit(inode->i_sb);
+ err = jbd2_complete_transaction(EXT4_SB(inode->i_sb)->s_journal,
+ EXT4_I(inode)->i_sync_tid);
} else {
struct ext4_iloc iloc;