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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>
This commit is contained in:
Hugh Dickins 2023-03-19 22:19:21 -07:00 committed by Andrew Morton
parent 097b3e59b2
commit 81914aff84
1 changed files with 12 additions and 5 deletions
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17
mm/shmem.c
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@ -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;