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do_generic_file_read(): fail immediately if killed

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If a fatal signal has been received, fail immediately instead of trying
to read more data.

If wait_on_page_locked_killable() was interrupted then this page is most
likely is not PageUptodate() and in this case do_generic_file_read()
will fail after lock_page_killable().

See also commit ebded02788 ("mm: filemap: avoid unnecessary calls to
lock_page when waiting for IO to complete during a read")

[[email protected]: changelog addition]
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Bart Van Assche <[email protected]>
Reviewed-by: Jan Kara <[email protected]>
Acked-by: Oleg Nesterov <[email protected]>
Acked-by: Michal Hocko <[email protected]>
Cc: Mel Gorman <[email protected]>
Cc: Hugh Dickins <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Bart Van Assche 2016-10-07 16:58:33 -07:00 • committed by Linus Torvalds
commit c4b209a426
1 changed files with 3 additions and 1 deletions
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4
mm/filemap.c
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@ -1721,7 +1721,9 @@ find_page:
* wait_on_page_locked is used to avoid unnecessarily
* serialisations and why it's safe.
*/
wait_on_page_locked_killable(page);
error = wait_on_page_locked_killable(page);
if (unlikely(error))
goto readpage_error;
if (PageUptodate(page))
goto page_ok;