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filemap: introduce filemap_invalidate_pages

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kiocb_invalidate_pages() is useful for the write path, however not
everything is backed by kiocb and we want to reuse the function for bio
based discard implementation. Extract and and reuse a new helper called
filemap_invalidate_pages(), which takes a argument indicating whether it
should be non-blocking and might return -EAGAIN.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/f81374b52c92d0dce0f01a279d1eed42b54056aa.1726072086.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2024-09-11 17:34:39 +01:00 committed by Jens Axboe
parent a6ccb48e13
commit a12c883a0a
2 changed files with 14 additions and 5 deletions
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2
include/linux/pagemap.h
View File

@ -32,6 +32,8 @@ int invalidate_inode_pages2_range(struct address_space *mapping,
pgoff_t start, pgoff_t end);
int kiocb_invalidate_pages(struct kiocb *iocb, size_t count);
void kiocb_invalidate_post_direct_write(struct kiocb *iocb, size_t count);
int filemap_invalidate_pages(struct address_space *mapping,
loff_t pos, loff_t end, bool nowait);
int write_inode_now(struct inode *, int sync);
int filemap_fdatawrite(struct address_space *);

17
mm/filemap.c
View File

@ -2712,14 +2712,12 @@ int kiocb_write_and_wait(struct kiocb *iocb, size_t count)
}
EXPORT_SYMBOL_GPL(kiocb_write_and_wait);
int kiocb_invalidate_pages(struct kiocb *iocb, size_t count)
int filemap_invalidate_pages(struct address_space *mapping,
loff_t pos, loff_t end, bool nowait)
{
struct address_space *mapping = iocb->ki_filp->f_mapping;
loff_t pos = iocb->ki_pos;
loff_t end = pos + count - 1;
int ret;
if (iocb->ki_flags & IOCB_NOWAIT) {
if (nowait) {
/* we could block if there are any pages in the range */
if (filemap_range_has_page(mapping, pos, end))
return -EAGAIN;
@ -2738,6 +2736,15 @@ int kiocb_invalidate_pages(struct kiocb *iocb, size_t count)
return invalidate_inode_pages2_range(mapping, pos >> PAGE_SHIFT,
end >> PAGE_SHIFT);
}
int kiocb_invalidate_pages(struct kiocb *iocb, size_t count)
{
struct address_space *mapping = iocb->ki_filp->f_mapping;
return filemap_invalidate_pages(mapping, iocb->ki_pos,
iocb->ki_pos + count - 1,
iocb->ki_flags & IOCB_NOWAIT);
}
EXPORT_SYMBOL_GPL(kiocb_invalidate_pages);
/**