On Wed, Aug 14, 2013 at 11:10:54AM +0200, Jan Kara wrote: > Hello, > > this is second iteration of patches to fix handling of O_SYNC AIO DIO. > Since previous version I've addressed Dave's comments: > - slightly expanded changelog of the first patch > - workqueue is now created with parameters allowing paralelism > - workqueue name contains sb->s_id > - workqueue is created on demand (I decided to do this to reduce the overhead > in unnecessary cases) > > The patchset survives xfstests run for ext4 & xfs so it should be sane. Since > this touches several filesystems (although only ext4 & xfs are non-trivial), > the question is who should carry these patches. Maybe Al? But since xfs and > ext4 changes are non-trivial, I'd like to have a review from their > developers... Looks sane, except that I'd probably put destroying the queue after evict_inodes(), next to ->put_super() call. Said that, there's another interesting problem in the code affected by that sucker: generic_file_aio_write() might very well sync the wrong range. Consider O_APPEND case; __generic_file_aio_write() will call generic_write_checks(), which will update its copy of pos, and proceed to write starting from there. All right and proper, but then we return into generic_file_aio_write() and sync the range of the right length, starting at the *original* value of pos... -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
