Commit 5b68de67 authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Andrew Morton

fs: remove an outdated comment on mpage_writepages

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outdated comment on the locking pattern there.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.deSigned-off-by: default avatarChristoph Hellwig <hch@lst.de>
Reviewed-by: default avatarJan 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: default avatarAndrew Morton <akpm@linux-foundation.org>
parent 81e506be
...@@ -641,14 +641,6 @@ static int __mpage_writepage(struct page *page, struct writeback_control *wbc, ...@@ -641,14 +641,6 @@ static int __mpage_writepage(struct page *page, struct writeback_control *wbc,
* *
* This is a library function, which implements the writepages() * This is a library function, which implements the writepages()
* address_space_operation. * 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 int
mpage_writepages(struct address_space *mapping, mpage_writepages(struct address_space *mapping,
......
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