Patch series "remove generic_writepages"
This series removes generic_writepages by open coding the current
functionality in the three remaining callers. Besides removing some
code the main benefit is that one of the few remaining ->writepage
callers from outside the core page cache code go away.
This patch (of 6):
mpage_writepages doesn't do any of the page locking itself, so remove and
outdated comment on the locking pattern there.
Link: https://lkml.kernel.org/r/20221229161031.391878-1-hch@lst.de
Link: https://lkml.kernel.org/r/20221229161031.391878-2-hch@lst.de
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jan Kara <jack@suse.cz>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Joseph Qi <joseph.qi@linux.alibaba.com>
Cc: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
*
* This is a library function, which implements the writepages()
* address_space_operation.
- *
- * If a page is already under I/O, generic_writepages() skips it, even
- * if it's dirty. This is desirable behaviour for memory-cleaning writeback,
- * but it is INCORRECT for data-integrity system calls such as fsync(). fsync()
- * and msync() need to guarantee that all the data which was dirty at the time
- * the call was made get new I/O started against them. If wbc->sync_mode is
- * WB_SYNC_ALL then we were called for data integrity and we must wait for
- * existing IO to complete.
*/
int
mpage_writepages(struct address_space *mapping,