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author | Curt Wohlgemuth <curtw@google.com> | 2011-08-13 11:25:18 -0400 |
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committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-08-29 13:29:10 -0700 |
commit | 2fb522e963f57a6c0206f67a355b8131b16ef607 (patch) | |
tree | e8f00987f7956949e4dec58ce2021539381eb1c4 /fs/ext4 | |
parent | f5dce23cc163abd3a4ebece8ae9f140426bf8253 (diff) | |
download | kernel_samsung_espresso10-2fb522e963f57a6c0206f67a355b8131b16ef607.zip kernel_samsung_espresso10-2fb522e963f57a6c0206f67a355b8131b16ef607.tar.gz kernel_samsung_espresso10-2fb522e963f57a6c0206f67a355b8131b16ef607.tar.bz2 |
ext4: Fix ext4_should_writeback_data() for no-journal mode
commit 441c850857148935babe000fc2ba1455fe54a6a9 upstream.
ext4_should_writeback_data() had an incorrect sequence of
tests to determine if it should return 0 or 1: in
particular, even in no-journal mode, 0 was being returned
for a non-regular-file inode.
This meant that, in non-journal mode, we would use
ext4_journalled_aops for directories, symlinks, and other
non-regular files. However, calling journalled aop
callbacks when there is no valid handle, can cause problems.
This would cause a kernel crash with Jan Kara's commit
2d859db3e4 ("ext4: fix data corruption in inodes with
journalled data"), because we now dereference 'handle' in
ext4_journalled_write_end().
I also added BUG_ONs to check for a valid handle in the
obviously journal-only aops callbacks.
I tested this running xfstests with a scratch device in
these modes:
- no-journal
- data=ordered
- data=writeback
- data=journal
All work fine; the data=journal run has many failures and a
crash in xfstests 074, but this is no different from a
vanilla kernel.
Signed-off-by: Curt Wohlgemuth <curtw@google.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'fs/ext4')
-rw-r--r-- | fs/ext4/ext4_jbd2.h | 4 | ||||
-rw-r--r-- | fs/ext4/inode.c | 4 |
2 files changed, 6 insertions, 2 deletions
diff --git a/fs/ext4/ext4_jbd2.h b/fs/ext4/ext4_jbd2.h index bb85757..5802fa1 100644 --- a/fs/ext4/ext4_jbd2.h +++ b/fs/ext4/ext4_jbd2.h @@ -289,10 +289,10 @@ static inline int ext4_should_order_data(struct inode *inode) static inline int ext4_should_writeback_data(struct inode *inode) { - if (!S_ISREG(inode->i_mode)) - return 0; if (EXT4_JOURNAL(inode) == NULL) return 1; + if (!S_ISREG(inode->i_mode)) + return 0; if (ext4_test_inode_flag(inode, EXT4_INODE_JOURNAL_DATA)) return 0; if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA) diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index e3126c0..0b60a46 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -1849,6 +1849,8 @@ static int ext4_journalled_write_end(struct file *file, from = pos & (PAGE_CACHE_SIZE - 1); to = from + len; + BUG_ON(!ext4_handle_valid(handle)); + if (copied < len) { if (!PageUptodate(page)) copied = 0; @@ -2564,6 +2566,8 @@ static int __ext4_journalled_writepage(struct page *page, goto out; } + BUG_ON(!ext4_handle_valid(handle)); + ret = walk_page_buffers(handle, page_bufs, 0, len, NULL, do_journal_get_write_access); |