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fs: Add IOCB_NOIO flag for generic_file_read_iter
authorAndreas Gruenbacher <agruenba@redhat.com>
Thu, 21 Nov 2019 23:25:07 +0000 (23:25 +0000)
committerAndreas Gruenbacher <agruenba@redhat.com>
Tue, 7 Jul 2020 21:40:08 +0000 (23:40 +0200)
commit41da51bce36f44eefc1e3d0f47d18841cbd065ba
tree2e9b94061e69e326b30a5f8eabc350258f24c69atree | snapshot
parentdcb7fd82c75ee2d6e6f9d8cc71c52519ed52e258commit | diff
fs: Add IOCB_NOIO flag for generic_file_read_iter

Add an IOCB_NOIO flag that indicates to generic_file_read_iter that it
shouldn't trigger any filesystem I/O for the actual request or for
readahead.  This allows to do tentative reads out of the page cache as
some filesystems allow, and to take the appropriate locks and retry the
reads only if the requested pages are not cached.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
include/linux/fs.h diff | blob | history
mm/filemap.c diff | blob | history
Domain: System / Kernel;