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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: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Matthew Wilcox (Oracle) 2022-09-02 20:46:22 +01:00 committed by Andrew Morton
parent a7f5862cc0
commit eff1f906c2
1 changed files with 5 additions and 3 deletions
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8
mm/shmem.c
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@ -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;
}