diff options
| author | Hugh Dickins <hughd@google.com> | 2023-03-20 08:19:21 +0300 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2023-04-06 05:42:42 +0300 |
| commit | 81914aff84e83561ab556dab380e7bbe9c2102b1 (patch) | |
| tree | 88bec7bdbafe57a1e31e3b6c7a6ac7647884792e | |
| parent | 097b3e59b25e61481d93c6da5472319c0b7249e8 (diff) | |
| download | linux-81914aff84e83561ab556dab380e7bbe9c2102b1.tar.xz | |
shmem: shmem_get_partial_folio use filemap_get_entry
To avoid use of the FGP_ENTRY flag, adapt shmem_get_partial_folio() to use
filemap_get_entry() and folio_lock() instead of __filemap_get_folio().
Update "page" in the comments there to "folio".
Link: https://lkml.kernel.org/r/9d1aaa4-1337-fb81-6f37-74ebc96f9ef@google.com
Signed-off-by: Hugh Dickins <hughd@google.com>
Cc: Andreas Gruenbacher <agruenba@redhat.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Ryusuke Konishi <konishi.ryusuke@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
| -rw-r--r-- | mm/shmem.c | 17 |
1 files changed, 12 insertions, 5 deletions
diff --git a/mm/shmem.c b/mm/shmem.c index 787e83791eb5..1549866c208f 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -885,14 +885,21 @@ static struct folio *shmem_get_partial_folio(struct inode *inode, pgoff_t index) /* * At first avoid shmem_get_folio(,,,SGP_READ): that fails - * beyond i_size, and reports fallocated pages as holes. + * beyond i_size, and reports fallocated folios as holes. */ - folio = __filemap_get_folio(inode->i_mapping, index, - FGP_ENTRY | FGP_LOCK, 0); - if (!xa_is_value(folio)) + folio = filemap_get_entry(inode->i_mapping, index); + if (!folio) return folio; + if (!xa_is_value(folio)) { + folio_lock(folio); + if (folio->mapping == inode->i_mapping) + return folio; + /* The folio has been swapped out */ + folio_unlock(folio); + folio_put(folio); + } /* - * But read a page back from swap if any of it is within i_size + * But read a folio back from swap if any of it is within i_size * (although in some cases this is just a waste of time). */ folio = NULL; |