Merge tag 'vfs-6.10.netfs' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs

Pull netfs updates from Christian Brauner:
 "This reworks the netfslib writeback implementation so that pages read
  from the cache are written to the cache through ->writepages(),
  thereby allowing the fscache page flag to be retired.

  The reworking also:

   - builds on top of the new writeback_iter() infrastructure

   - makes it possible to use vectored write RPCs as discontiguous
     streams of pages can be accommodated

   - makes it easier to do simultaneous content crypto and stream
     division

   - provides support for retrying writes and re-dividing a stream

   - replaces the ->launder_folio() op, so that ->writepages() is used
     instead

   - uses mempools to allocate the netfs_io_request and
     netfs_io_subrequest structs to avoid allocation failure in the
     writeback path

  Some code that uses the fscache page flag is retained for
  compatibility purposes with nfs and ceph. The code is switched to
  using the synonymous private_2 label instead and marked with
  deprecation comments.

  The merge commit contains additional details on the new algorithm that
  I've left out of here as it would probably be excessively detailed.

  On top of the netfslib infrastructure this contains the work to
  convert cifs over to netfslib"

* tag 'vfs-6.10.netfs' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs: (38 commits)
  cifs: Enable large folio support
  cifs: Remove some code that's no longer used, part 3
  cifs: Remove some code that's no longer used, part 2
  cifs: Remove some code that's no longer used, part 1
  cifs: Cut over to using netfslib
  cifs: Implement netfslib hooks
  cifs: Make add_credits_and_wake_if() clear deducted credits
  cifs: Add mempools for cifs_io_request and cifs_io_subrequest structs
  cifs: Set zero_point in the copy_file_range() and remap_file_range()
  cifs: Move cifs_loose_read_iter() and cifs_file_write_iter() to file.c
  cifs: Replace the writedata replay bool with a netfs sreq flag
  cifs: Make wait_mtu_credits take size_t args
  cifs: Use more fields from netfs_io_subrequest
  cifs: Replace cifs_writedata with a wrapper around netfs_io_subrequest
  cifs: Replace cifs_readdata with a wrapper around netfs_io_subrequest
  cifs: Use alternative invalidation to using launder_folio
  netfs, afs: Use writeback retry to deal with alternate keys
  netfs: Miscellaneous tidy ups
  netfs: Remove the old writeback code
  netfs: Cut over to using new writeback code
  ...

1 files changed, 14 insertions, 8 deletions

diff --git a/include/linux/fscache.h b/include/linux/fscache.h
index 6e8562cbcc43..9de27643607f 100644
--- a/include/linux/fscache.h
+++ b/include/linux/fscache.h
@@ -172,9 +172,12 @@ extern void __fscache_invalidate(struct fscache_cookie *, const void *, loff_t,
 extern int __fscache_begin_read_operation(struct netfs_cache_resources *, struct fscache_cookie *);
 extern int __fscache_begin_write_operation(struct netfs_cache_resources *, struct fscache_cookie *);
 
-extern void __fscache_write_to_cache(struct fscache_cookie *, struct address_space *,
-				     loff_t, size_t, loff_t, netfs_io_terminated_t, void *,
-				     bool);
+void __fscache_write_to_cache(struct fscache_cookie *cookie,
+			      struct address_space *mapping,
+			      loff_t start, size_t len, loff_t i_size,
+			      netfs_io_terminated_t term_func,
+			      void *term_func_priv,
+			      bool using_pgpriv2, bool cond);
 extern void __fscache_clear_page_bits(struct address_space *, loff_t, size_t);
 
 /**
@@ -597,7 +600,8 @@ static inline void fscache_clear_page_bits(struct address_space *mapping,
  * @i_size: The new size of the inode
  * @term_func: The function to call upon completion
  * @term_func_priv: The private data for @term_func
- * @caching: If PG_fscache has been set
+ * @using_pgpriv2: If we're using PG_private_2 to mark in-progress write
+ * @caching: If we actually want to do the caching
  *
  * Helper function for a netfs to write dirty data from an inode into the cache
  * object that's backing it.
@@ -608,19 +612,21 @@ static inline void fscache_clear_page_bits(struct address_space *mapping,
  * marked with PG_fscache.
  *
  * If given, @term_func will be called upon completion and supplied with
- * @term_func_priv.  Note that the PG_fscache flags will have been cleared by
- * this point, so the netfs must retain its own pin on the mapping.
+ * @term_func_priv.  Note that if @using_pgpriv2 is set, the PG_private_2 flags
+ * will have been cleared by this point, so the netfs must retain its own pin
+ * on the mapping.
  */
 static inline void fscache_write_to_cache(struct fscache_cookie *cookie,
 					  struct address_space *mapping,
 					  loff_t start, size_t len, loff_t i_size,
 					  netfs_io_terminated_t term_func,
 					  void *term_func_priv,
-					  bool caching)
+					  bool using_pgpriv2, bool caching)
 {
 	if (caching)
 		__fscache_write_to_cache(cookie, mapping, start, len, i_size,
-					 term_func, term_func_priv, caching);
+					 term_func, term_func_priv,
+					 using_pgpriv2, caching);
 	else if (term_func)
 		term_func(term_func_priv, -ENOBUFS, false);