Commit b8713c4d authored by David Howells's avatar David Howells Committed by Steve French
Browse files

cifs: Add some helper functions 



Add some helper functions to manipulate the folio marks by iterating
through a list of folios held in an xarray rather than using a page list.

Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
cc: Steve French <sfrench@samba.org>
cc: Shyam Prasad N <nspmangalore@gmail.com>
cc: Rohith Surabattula <rohiths.msft@gmail.com>
cc: Jeff Layton <jlayton@kernel.org>
cc: linux-cifs@vger.kernel.org

Link: https://lore.kernel.org/r/164928616583.457102.15157033997163988344.stgit@warthog.procyon.org.uk/ # v1
Link: https://lore.kernel.org/r/165211418840.3154751.3090684430628501879.stgit@warthog.procyon.org.uk/ # v1
Link: https://lore.kernel.org/r/165348878940.2106726.204291614267188735.stgit@warthog.procyon.org.uk/ # v1
Link: https://lore.kernel.org/r/165364825674.3334034.3356201708659748648.stgit@warthog.procyon.org.uk/ # v3
Link: https://lore.kernel.org/r/166126394799.708021.10637797063862600488.stgit@warthog.procyon.org.uk/ # v1
Link: https://lore.kernel.org/r/166697258147.61150.9940790486999562110.stgit@warthog.procyon.org.uk/ # rfc
Link: https://lore.kernel.org/r/166732030314.3186319.9209944805565413627.stgit@warthog.procyon.org.uk/

 # rfc
Signed-off-by: default avatarSteve French <stfrench@microsoft.com>
parent 39bc5820

fs/cifs/cifsfs.h

+3 −0
Original line number Diff line number Diff line
@@ -113,6 +113,9 @@ extern int cifs_file_strict_mmap(struct file *file, struct vm_area_struct *vma); 
extern const struct file_operations cifs_dir_ops;

extern int cifs_dir_open(struct inode *inode, struct file *file);

extern int cifs_readdir(struct file *file, struct dir_context *ctx);

extern void cifs_pages_written_back(struct inode *inode, loff_t start, unsigned int len);

extern void cifs_pages_write_failed(struct inode *inode, loff_t start, unsigned int len);

extern void cifs_pages_write_redirty(struct inode *inode, loff_t start, unsigned int len);



/* Functions related to dir entries */

extern const struct dentry_operations cifs_dentry_ops;

fs/cifs/file.c

+93 −0
Original line number Diff line number Diff line
@@ -36,6 +36,99 @@ 
#include "cifs_ioctl.h"

#include "cached_dir.h"



/*

 * Completion of write to server.

 */

void cifs_pages_written_back(struct inode *inode, loff_t start, unsigned int len)

{

	struct address_space *mapping = inode->i_mapping;

	struct folio *folio;

	pgoff_t end;



	XA_STATE(xas, &mapping->i_pages, start / PAGE_SIZE);



	if (!len)

		return;



	rcu_read_lock();



	end = (start + len - 1) / PAGE_SIZE;

	xas_for_each(&xas, folio, end) {

		if (!folio_test_writeback(folio)) {

			WARN_ONCE(1, "bad %x @%llx page %lx %lx\n",

				  len, start, folio_index(folio), end);

			continue;

		}



		folio_detach_private(folio);

		folio_end_writeback(folio);

	}



	rcu_read_unlock();

}



/*

 * Failure of write to server.

 */

void cifs_pages_write_failed(struct inode *inode, loff_t start, unsigned int len)

{

	struct address_space *mapping = inode->i_mapping;

	struct folio *folio;

	pgoff_t end;



	XA_STATE(xas, &mapping->i_pages, start / PAGE_SIZE);



	if (!len)

		return;



	rcu_read_lock();



	end = (start + len - 1) / PAGE_SIZE;

	xas_for_each(&xas, folio, end) {

		if (!folio_test_writeback(folio)) {

			WARN_ONCE(1, "bad %x @%llx page %lx %lx\n",

				  len, start, folio_index(folio), end);

			continue;

		}



		folio_set_error(folio);

		folio_end_writeback(folio);

	}



	rcu_read_unlock();

}



/*

 * Redirty pages after a temporary failure.

 */

void cifs_pages_write_redirty(struct inode *inode, loff_t start, unsigned int len)

{

	struct address_space *mapping = inode->i_mapping;

	struct folio *folio;

	pgoff_t end;



	XA_STATE(xas, &mapping->i_pages, start / PAGE_SIZE);



	if (!len)

		return;



	rcu_read_lock();



	end = (start + len - 1) / PAGE_SIZE;

	xas_for_each(&xas, folio, end) {

		if (!folio_test_writeback(folio)) {

			WARN_ONCE(1, "bad %x @%llx page %lx %lx\n",

				  len, start, folio_index(folio), end);

			continue;

		}



		filemap_dirty_folio(folio->mapping, folio);

		folio_end_writeback(folio);

	}



	rcu_read_unlock();

}



/*

 * Mark as invalid, all open files on tree connections since they

 * were closed when session to server was lost.