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authorYafang Shao <laoar.shao@gmail.com>2024-08-20 10:26:39 +0800
committerAndrew Morton <akpm@linux-foundation.org>2024-09-03 21:15:40 -0700
commit0a2d82946be67e02fdf85a4010606bdc0546ba44 (patch)
treeec1b370e12964dc6d8374e781986f640e3be8fbb /mm/filemap.c
parentcd5f3193b432cd70cc1c19aba790300dd11ae934 (diff)
mm: allow read-ahead with IOCB_NOWAIT set
Readahead support for IOCB_NOWAIT was introduced in commit 2e85abf053b9 ("mm: allow read-ahead with IOCB_NOWAIT set"). However, this implementation broke the semantics of IOCB_NOWAIT by potentially causing it to wait on I/O during memory reclamation. This behavior was later modified in commit efa8480a8316 ("fs: RWF_NOWAIT should imply IOCB_NOIO"). To resolve the blocking issue during memory reclamation, we can use memalloc_noio_{save,restore} to ensure non-blocking behavior. This change restores the original functionality, allowing preadv2(IOCB_NOWAIT) to trigger readahead if the file content is not present in the page cache. While this process may trigger direct memory reclamation, the __GFP_NORETRY flag is set in the readahead GFP flags, ensuring it won't block. A use case for this change is when we want to trigger readahead in the preadv2(2) syscall if the file cache is absent, but without waiting for certain filesystem locks, like xfs_ilock. A simple example is as follows: retry: if (preadv2(fd, iovec, cnt, offset, RWF_NOWAIT) < 0) { do_other_work(); goto retry; } Link: https://lore.gnuweeb.org/io-uring/20200624164127.GP21350@casper.infradead.org/ Link: https://lkml.kernel.org/r/20240820022639.89562-1-laoar.shao@gmail.com Signed-off-by: Yafang Shao <laoar.shao@gmail.com> Cc: Jens Axboe <axboe@kernel.dk> Cc: Matthew Wilcox <willy@infradead.org> Cc: Dave Chinner <david@fromorbit.com> Cc: Jan Kara <jack@suse.cz> Cc: Christian Brauner <brauner@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/filemap.c')
-rw-r--r--mm/filemap.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/mm/filemap.c b/mm/filemap.c
index fdaa1e5e3078..070dee9791a9 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -46,6 +46,7 @@
#include <linux/pipe_fs_i.h>
#include <linux/splice.h>
#include <linux/rcupdate_wait.h>
+#include <linux/sched/mm.h>
#include <asm/pgalloc.h>
#include <asm/tlbflush.h>
#include "internal.h"
@@ -2519,6 +2520,7 @@ static int filemap_get_pages(struct kiocb *iocb, size_t count,
pgoff_t index = iocb->ki_pos >> PAGE_SHIFT;
pgoff_t last_index;
struct folio *folio;
+ unsigned int flags;
int err = 0;
/* "last_index" is the index of the page beyond the end of the read */
@@ -2531,8 +2533,12 @@ retry:
if (!folio_batch_count(fbatch)) {
if (iocb->ki_flags & IOCB_NOIO)
return -EAGAIN;
+ if (iocb->ki_flags & IOCB_NOWAIT)
+ flags = memalloc_noio_save();
page_cache_sync_readahead(mapping, ra, filp, index,
last_index - index);
+ if (iocb->ki_flags & IOCB_NOWAIT)
+ memalloc_noio_restore(flags);
filemap_get_read_batch(mapping, index, last_index - 1, fbatch);
}
if (!folio_batch_count(fbatch)) {