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cifs: Use a folio in cifs_page_mkwrite()

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Avoids many calls to compound_head() and removes calls to various
compat functions.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: David Howells <dhowells@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Matthew Wilcox (Oracle) 2023-02-08 14:56:10 +00:00 committed by Steve French
parent d447e794a3
commit c191bc070e
1 changed files with 8 additions and 9 deletions
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17
fs/cifs/file.c
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@ -4489,23 +4489,22 @@ cifs_read(struct file *file, char *read_data, size_t read_size, loff_t *offset)
* If the page is mmap'ed into a process' page tables, then we need to make
* sure that it doesn't change while being written back.
*/
static vm_fault_t
cifs_page_mkwrite(struct vm_fault *vmf)
static vm_fault_t cifs_page_mkwrite(struct vm_fault *vmf)
{
struct page *page = vmf->page;
struct folio *folio = page_folio(vmf->page);
/* Wait for the page to be written to the cache before we allow it to
* be modified. We then assume the entire page will need writing back.
/* Wait for the folio to be written to the cache before we allow it to
* be modified. We then assume the entire folio will need writing back.
*/
#ifdef CONFIG_CIFS_FSCACHE
if (PageFsCache(page) &&
wait_on_page_fscache_killable(page) < 0)
if (folio_test_fscache(folio) &&
folio_wait_fscache_killable(folio) < 0)
return VM_FAULT_RETRY;
#endif
wait_on_page_writeback(page);
folio_wait_writeback(folio);
if (lock_page_killable(page) < 0)
if (folio_lock_killable(folio) < 0)
return VM_FAULT_RETRY;
return VM_FAULT_LOCKED;
}