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fs: support IOCB_NOWAIT in generic_file_buffered_read

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Allow generic_file_buffered_read to bail out early instead of waiting for
the page lock or reading a page if IOCB_NOWAIT is specified.

Signed-off-by: Milosz Tanski <[email protected]>
Reviewed-by: Christoph Hellwig <[email protected]>
Reviewed-by: Jeff Moyer <[email protected]>
Acked-by: Sage Weil <[email protected]>
Signed-off-by: Al Viro <[email protected]>
This commit is contained in:
Milosz Tanski 2017-08-29 16:13:19 +02:00 • committed by Al Viro
commit 3239d83484
1 changed files with 9 additions and 0 deletions
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9
mm/filemap.c
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@ -1939,6 +1939,8 @@ find_page:
page = find_get_page(mapping, index);
if (!page) {
if (iocb->ki_flags & IOCB_NOWAIT)
goto would_block;
page_cache_sync_readahead(mapping,
ra, filp,
index, last_index - index);
@ -1952,6 +1954,11 @@ find_page:
index, last_index - index);
}
if (!PageUptodate(page)) {
if (iocb->ki_flags & IOCB_NOWAIT) {
put_page(page);
goto would_block;
}
/*
* See comment in do_read_cache_page on why
* wait_on_page_locked is used to avoid unnecessarily
@ -2133,6 +2140,8 @@ no_cached_page:
goto readpage;
}
would_block:
error = -EAGAIN;
out:
ra->prev_pos = prev_index;
ra->prev_pos <<= PAGE_SHIFT;