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| author | Christoph Hellwig <hch@lst.de> | 2023-03-07 15:34:10 +0100 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2023-04-05 19:42:42 -0700 |
| commit | 66dabbb65d673aef40dd17bf62c042be8f6d4a4b (patch) | |
| tree | a14c48222ab659cc6a9344ca6a1468a09c09eb42 /mm/memcontrol.c | |
| parent | 48c9d11375fc66f1e59d0e9b27d121e015a50904 (diff) | |
| download | linux-66dabbb65d673aef40dd17bf62c042be8f6d4a4b.tar.gz linux-66dabbb65d673aef40dd17bf62c042be8f6d4a4b.tar.bz2 linux-66dabbb65d673aef40dd17bf62c042be8f6d4a4b.zip | |
mm: return an ERR_PTR from __filemap_get_folio
Instead of returning NULL for all errors, distinguish between:
- no entry found and not asked to allocated (-ENOENT)
- failed to allocate memory (-ENOMEM)
- would block (-EAGAIN)
so that callers don't have to guess the error based on the passed in
flags.
Also pass through the error through the direct callers: filemap_get_folio,
filemap_lock_folio filemap_grab_folio and filemap_get_incore_folio.
[hch@lst.de: fix null-pointer deref]
Link: https://lkml.kernel.org/r/20230310070023.GA13563@lst.de
Link: https://lkml.kernel.org/r/20230310043137.GA1624890@u2004
Link: https://lkml.kernel.org/r/20230307143410.28031-8-hch@lst.de
Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Ryusuke Konishi <konishi.ryusuke@gmail.com> [nilfs2]
Cc: Andreas Gruenbacher <agruenba@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Naoya Horiguchi <naoya.horiguchi@linux.dev>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/memcontrol.c')
| -rw-r--r-- | mm/memcontrol.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c index 13ec89c45389..0524add35cae 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -5705,7 +5705,7 @@ static struct page *mc_handle_file_pte(struct vm_area_struct *vma, /* shmem/tmpfs may report page out on swap: account for that too. */ index = linear_page_index(vma, addr); folio = filemap_get_incore_folio(vma->vm_file->f_mapping, index); - if (!folio) + if (IS_ERR(folio)) return NULL; return folio_file_page(folio, index); } |