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Frank Mayhar authored
Teach ext4_write_inode() and ext4_do_update_inode() about non-journal mode: If we're not using a journal, ext4_write_inode() now calls ext4_do_update_inode() (after getting the iloc via ext4_get_inode_loc()) with a new "do_sync" parameter. If that parameter is nonzero _and_ we're not using a journal, ext4_do_update_inode() calls sync_dirty_buffer() instead of ext4_handle_dirty_metadata(). This problem was found in power-fail testing, checking the amount of loss of files and blocks after a power failure when using fsync() and when not using fsync(). It turned out that using fsync() was actually worse than not doing so, possibly because it increased the likelihood that the inodes would remain unflushed and would therefore be lost at the power failure. Signed-off-by: Frank Mayhar <fmayhar@google.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
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