Commit eff1f906 authored by Matthew Wilcox (Oracle)'s avatar Matthew Wilcox (Oracle) Committed by Andrew Morton
Browse files

shmem: convert shmem_write_begin() to use shmem_get_folio() 

Use a folio throughout this function, saving a couple of calls to
compound_head().

Link: https://lkml.kernel.org/r/20220902194653.1739778-27-willy@infradead.org


Signed-off-by: default avatarMatthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
parent a7f5862c

mm/shmem.c

+5 −3
Original line number Diff line number Diff line
@@ -2498,6 +2498,7 @@ shmem_write_begin(struct file *file, struct address_space *mapping, 
	struct inode *inode = mapping->host;

	struct shmem_inode_info *info = SHMEM_I(inode);

	pgoff_t index = pos >> PAGE_SHIFT;

	struct folio *folio;

	int ret = 0;



	/* i_rwsem is held by caller */
@@ -2509,14 +2510,15 @@ shmem_write_begin(struct file *file, struct address_space *mapping, 
			return -EPERM;

	}



	ret = shmem_getpage(inode, index, pagep, SGP_WRITE);

	ret = shmem_get_folio(inode, index, &folio, SGP_WRITE);



	if (ret)

		return ret;



	*pagep = folio_file_page(folio, index);

	if (PageHWPoison(*pagep)) {

		unlock_page(*pagep);

		put_page(*pagep);

		folio_unlock(folio);

		folio_put(folio);

		*pagep = NULL;

		return -EIO;

	}