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fs: remove an outdated comment on mpage_writepages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 This patch (of 6): mpage_writepages doesn't do any of the page locking itself, so remove and outdated comment on the locking pattern there.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.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>
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@ -641,14 +641,6 @@ static int __mpage_writepage(struct page *page, struct writeback_control *wbc,
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*
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* This is a library function, which implements the writepages()
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* address_space_operation.
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*
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* If a page is already under I/O, generic_writepages() skips it, even
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* if it's dirty. This is desirable behaviour for memory-cleaning writeback,
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* but it is INCORRECT for data-integrity system calls such as fsync(). fsync()
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* and msync() need to guarantee that all the data which was dirty at the time
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* the call was made get new I/O started against them. If wbc->sync_mode is
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* WB_SYNC_ALL then we were called for data integrity and we must wait for
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* existing IO to complete.
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*/
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int
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mpage_writepages(struct address_space *mapping,
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