diff mbox series

[RFC,07/53] netfs: Provide invalidate_folio and release_folio calls

Message ID 20231013160423.2218093-8-dhowells@redhat.com (mailing list archive)
State New, archived
Headers show
Series netfs, afs, cifs: Delegate high-level I/O to netfslib | expand

Commit Message

David Howells Oct. 13, 2023, 4:03 p.m. UTC 
Provide default invalidate_folio and release_folio calls.  These will need
to interact with invalidation correctly at some point.  They will be needed
if netfslib is to make use of folio->private for its own purposes.

Signed-off-by: David Howells <dhowells@redhat.com>
cc: Jeff Layton <jlayton@kernel.org>
cc: linux-cachefs@redhat.com
cc: linux-fsdevel@vger.kernel.org
cc: linux-mm@kvack.org
---
 fs/9p/vfs_addr.c      | 33 ++-------------------------
 fs/afs/file.c         | 53 ++++---------------------------------------
 fs/ceph/addr.c        | 24 ++------------------
 fs/netfs/Makefile     |  1 +
 fs/netfs/misc.c       | 51 +++++++++++++++++++++++++++++++++++++++++
 include/linux/netfs.h |  6 +++--
 6 files changed, 64 insertions(+), 104 deletions(-)
 create mode 100644 fs/netfs/misc.c

Comments

Jeff Layton Oct. 16, 2023, 3:50 p.m. UTC | #1 
On Fri, 2023-10-13 at 17:03 +0100, David Howells wrote:
> Provide default invalidate_folio and release_folio calls.  These will need
> to interact with invalidation correctly at some point.  They will be needed
> if netfslib is to make use of folio->private for its own purposes.
> 
> Signed-off-by: David Howells <dhowells@redhat.com>
> cc: Jeff Layton <jlayton@kernel.org>
> cc: linux-cachefs@redhat.com
> cc: linux-fsdevel@vger.kernel.org
> cc: linux-mm@kvack.org
> ---
>  fs/9p/vfs_addr.c      | 33 ++-------------------------
>  fs/afs/file.c         | 53 ++++---------------------------------------
>  fs/ceph/addr.c        | 24 ++------------------
>  fs/netfs/Makefile     |  1 +
>  fs/netfs/misc.c       | 51 +++++++++++++++++++++++++++++++++++++++++
>  include/linux/netfs.h |  6 +++--
>  6 files changed, 64 insertions(+), 104 deletions(-)
>  create mode 100644 fs/netfs/misc.c
> 
> diff --git a/fs/9p/vfs_addr.c b/fs/9p/vfs_addr.c
> index 8a635999a7d6..18a666c43e4a 100644
> --- a/fs/9p/vfs_addr.c
> +++ b/fs/9p/vfs_addr.c
> @@ -104,35 +104,6 @@ const struct netfs_request_ops v9fs_req_ops = {
>  	.issue_read		= v9fs_issue_read,
>  };
>  
> -/**
> - * v9fs_release_folio - release the private state associated with a folio
> - * @folio: The folio to be released
> - * @gfp: The caller's allocation restrictions
> - *
> - * Returns true if the page can be released, false otherwise.
> - */
> -
> -static bool v9fs_release_folio(struct folio *folio, gfp_t gfp)
> -{
> -	if (folio_test_private(folio))
> -		return false;
> -#ifdef CONFIG_9P_FSCACHE
> -	if (folio_test_fscache(folio)) {
> -		if (current_is_kswapd() || !(gfp & __GFP_FS))
> -			return false;
> -		folio_wait_fscache(folio);
> -	}
> -	fscache_note_page_release(v9fs_inode_cookie(V9FS_I(folio_inode(folio))));
> -#endif
> -	return true;
> -}
> -
> -static void v9fs_invalidate_folio(struct folio *folio, size_t offset,
> -				 size_t length)
> -{
> -	folio_wait_fscache(folio);
> -}
> -
>  #ifdef CONFIG_9P_FSCACHE
>  static void v9fs_write_to_cache_done(void *priv, ssize_t transferred_or_error,
>  				     bool was_async)
> @@ -355,8 +326,8 @@ const struct address_space_operations v9fs_addr_operations = {
>  	.writepage = v9fs_vfs_writepage,
>  	.write_begin = v9fs_write_begin,
>  	.write_end = v9fs_write_end,
> -	.release_folio = v9fs_release_folio,
> -	.invalidate_folio = v9fs_invalidate_folio,
> +	.release_folio = netfs_release_folio,
> +	.invalidate_folio = netfs_invalidate_folio,
>  	.launder_folio = v9fs_launder_folio,
>  	.direct_IO = v9fs_direct_IO,
>  };
> diff --git a/fs/afs/file.c b/fs/afs/file.c
> index 0c49b3b6f214..3fea5cd8ef13 100644
> --- a/fs/afs/file.c
> +++ b/fs/afs/file.c
> @@ -20,9 +20,6 @@
>  
>  static int afs_file_mmap(struct file *file, struct vm_area_struct *vma);
>  static int afs_symlink_read_folio(struct file *file, struct folio *folio);
> -static void afs_invalidate_folio(struct folio *folio, size_t offset,
> -			       size_t length);
> -static bool afs_release_folio(struct folio *folio, gfp_t gfp_flags);
>  
>  static ssize_t afs_file_read_iter(struct kiocb *iocb, struct iov_iter *iter);
>  static ssize_t afs_file_splice_read(struct file *in, loff_t *ppos,
> @@ -57,8 +54,8 @@ const struct address_space_operations afs_file_aops = {
>  	.readahead	= netfs_readahead,
>  	.dirty_folio	= afs_dirty_folio,
>  	.launder_folio	= afs_launder_folio,
> -	.release_folio	= afs_release_folio,
> -	.invalidate_folio = afs_invalidate_folio,
> +	.release_folio	= netfs_release_folio,
> +	.invalidate_folio = netfs_invalidate_folio,
>  	.write_begin	= afs_write_begin,
>  	.write_end	= afs_write_end,
>  	.writepages	= afs_writepages,
> @@ -67,8 +64,8 @@ const struct address_space_operations afs_file_aops = {
>  
>  const struct address_space_operations afs_symlink_aops = {
>  	.read_folio	= afs_symlink_read_folio,
> -	.release_folio	= afs_release_folio,
> -	.invalidate_folio = afs_invalidate_folio,
> +	.release_folio	= netfs_release_folio,
> +	.invalidate_folio = netfs_invalidate_folio,
>  	.migrate_folio	= filemap_migrate_folio,
>  };
>  
> @@ -405,48 +402,6 @@ int afs_write_inode(struct inode *inode, struct writeback_control *wbc)
>  	return 0;
>  }
>  
> -/*
> - * invalidate part or all of a page
> - * - release a page and clean up its private data if offset is 0 (indicating
> - *   the entire page)
> - */
> -static void afs_invalidate_folio(struct folio *folio, size_t offset,
> -			       size_t length)
> -{
> -	_enter("{%lu},%zu,%zu", folio->index, offset, length);
> -
> -	folio_wait_fscache(folio);
> -	_leave("");
> -}
> -
> -/*
> - * release a page and clean up its private state if it's not busy
> - * - return true if the page can now be released, false if not
> - */
> -static bool afs_release_folio(struct folio *folio, gfp_t gfp)
> -{
> -	struct afs_vnode *vnode = AFS_FS_I(folio_inode(folio));
> -
> -	_enter("{{%llx:%llu}[%lu],%lx},%x",
> -	       vnode->fid.vid, vnode->fid.vnode, folio_index(folio), folio->flags,
> -	       gfp);
> -
> -	/* deny if folio is being written to the cache and the caller hasn't
> -	 * elected to wait */
> -#ifdef CONFIG_AFS_FSCACHE
> -	if (folio_test_fscache(folio)) {
> -		if (current_is_kswapd() || !(gfp & __GFP_FS))
> -			return false;
> -		folio_wait_fscache(folio);
> -	}
> -	fscache_note_page_release(afs_vnode_cache(vnode));
> -#endif
> -
> -	/* Indicate that the folio can be released */
> -	_leave(" = T");
> -	return true;
> -}
> -
>  static void afs_add_open_mmap(struct afs_vnode *vnode)
>  {
>  	if (atomic_inc_return(&vnode->cb_nr_mmap) == 1) {
> diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c
> index f4863078f7fe..ced19ff08988 100644
> --- a/fs/ceph/addr.c
> +++ b/fs/ceph/addr.c
> @@ -160,27 +160,7 @@ static void ceph_invalidate_folio(struct folio *folio, size_t offset,
>  		ceph_put_snap_context(snapc);
>  	}
>  
> -	folio_wait_fscache(folio);
> -}
> -
> -static bool ceph_release_folio(struct folio *folio, gfp_t gfp)
> -{
> -	struct inode *inode = folio->mapping->host;
> -
> -	dout("%llx:%llx release_folio idx %lu (%sdirty)\n",
> -	     ceph_vinop(inode),
> -	     folio->index, folio_test_dirty(folio) ? "" : "not ");
> -
> -	if (folio_test_private(folio))
> -		return false;
> -
> -	if (folio_test_fscache(folio)) {
> -		if (current_is_kswapd() || !(gfp & __GFP_FS))
> -			return false;
> -		folio_wait_fscache(folio);
> -	}
> -	ceph_fscache_note_page_release(inode);
> -	return true;
> +	netfs_invalidate_folio(folio, offset, length);
>  }
>  
>  static void ceph_netfs_expand_readahead(struct netfs_io_request *rreq)
> @@ -1563,7 +1543,7 @@ const struct address_space_operations ceph_aops = {
>  	.write_end = ceph_write_end,
>  	.dirty_folio = ceph_dirty_folio,
>  	.invalidate_folio = ceph_invalidate_folio,
> -	.release_folio = ceph_release_folio,
> +	.release_folio = netfs_release_folio,
>  	.direct_IO = noop_direct_IO,
>  };
>  
> diff --git a/fs/netfs/Makefile b/fs/netfs/Makefile
> index 386d6fb92793..cd22554d9048 100644
> --- a/fs/netfs/Makefile
> +++ b/fs/netfs/Makefile
> @@ -5,6 +5,7 @@ netfs-y := \
>  	io.o \
>  	iterator.o \
>  	main.o \
> +	misc.o \
>  	objects.o
>  
>  netfs-$(CONFIG_NETFS_STATS) += stats.o
> diff --git a/fs/netfs/misc.c b/fs/netfs/misc.c
> new file mode 100644
> index 000000000000..c3baf2b247d9
> --- /dev/null
> +++ b/fs/netfs/misc.c
> @@ -0,0 +1,51 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/* Miscellaneous routines.
> + *
> + * Copyright (C) 2022 Red Hat, Inc. All Rights Reserved.
> + * Written by David Howells (dhowells@redhat.com)
> + */
> +
> +#include <linux/swap.h>
> +#include "internal.h"
> +
> +/**
> + * netfs_invalidate_folio - Invalidate or partially invalidate a folio
> + * @folio: Folio proposed for release
> + * @offset: Offset of the invalidated region
> + * @length: Length of the invalidated region
> + *
> + * Invalidate part or all of a folio for a network filesystem.  The folio will
> + * be removed afterwards if the invalidated region covers the entire folio.
> + */
> +void netfs_invalidate_folio(struct folio *folio, size_t offset, size_t length)
> +{
> +	_enter("{%lx},%zx,%zx", folio_index(folio), offset, length);
> +
> +	folio_wait_fscache(folio);
> +}
> +EXPORT_SYMBOL(netfs_invalidate_folio);
> +
> +/**
> + * netfs_release_folio - Try to release a folio
> + * @folio: Folio proposed for release
> + * @gfp: Flags qualifying the release
> + *
> + * Request release of a folio and clean up its private state if it's not busy.
> + * Returns true if the folio can now be released, false if not
> + */
> +bool netfs_release_folio(struct folio *folio, gfp_t gfp)
> +{
> +	struct netfs_inode *ctx = netfs_inode(folio_inode(folio));
> +
> +	if (folio_test_private(folio))
> +		return false;
> +	if (folio_test_fscache(folio)) {
> +		if (current_is_kswapd() || !(gfp & __GFP_FS))
> +			return false;
> +		folio_wait_fscache(folio);
> +	}
> +
> +	fscache_note_page_release(netfs_i_cookie(ctx));
> +	return true;
> +}
> +EXPORT_SYMBOL(netfs_release_folio);
> diff --git a/include/linux/netfs.h b/include/linux/netfs.h
> index ed64d1034afa..daa431c4148d 100644
> --- a/include/linux/netfs.h
> +++ b/include/linux/netfs.h
> @@ -299,8 +299,10 @@ struct readahead_control;
>  void netfs_readahead(struct readahead_control *);
>  int netfs_read_folio(struct file *, struct folio *);
>  int netfs_write_begin(struct netfs_inode *, struct file *,
> -		struct address_space *, loff_t pos, unsigned int len,
> -		struct folio **, void **fsdata);
> +		      struct address_space *, loff_t pos, unsigned int len,
> +		      struct folio **, void **fsdata);
> +void netfs_invalidate_folio(struct folio *folio, size_t offset, size_t length);
> +bool netfs_release_folio(struct folio *folio, gfp_t gfp);
>  
>  void netfs_subreq_terminated(struct netfs_io_subrequest *, ssize_t, bool);
>  void netfs_get_subrequest(struct netfs_io_subrequest *subreq,
> 

Nice cleanup. Might can merge this in advance of the rest of the series.

Reviewed-by: Jeff Layton <jlayton@kernel.org>
diff mbox series

Patch

diff --git a/fs/9p/vfs_addr.c b/fs/9p/vfs_addr.c
index 8a635999a7d6..18a666c43e4a 100644
--- a/fs/9p/vfs_addr.c
+++ b/fs/9p/vfs_addr.c
@@ -104,35 +104,6 @@  const struct netfs_request_ops v9fs_req_ops = {
 	.issue_read		= v9fs_issue_read,
 };
 
-/**
- * v9fs_release_folio - release the private state associated with a folio
- * @folio: The folio to be released
- * @gfp: The caller's allocation restrictions
- *
- * Returns true if the page can be released, false otherwise.
- */
-
-static bool v9fs_release_folio(struct folio *folio, gfp_t gfp)
-{
-	if (folio_test_private(folio))
-		return false;
-#ifdef CONFIG_9P_FSCACHE
-	if (folio_test_fscache(folio)) {
-		if (current_is_kswapd() || !(gfp & __GFP_FS))
-			return false;
-		folio_wait_fscache(folio);
-	}
-	fscache_note_page_release(v9fs_inode_cookie(V9FS_I(folio_inode(folio))));
-#endif
-	return true;
-}
-
-static void v9fs_invalidate_folio(struct folio *folio, size_t offset,
-				 size_t length)
-{
-	folio_wait_fscache(folio);
-}
-
 #ifdef CONFIG_9P_FSCACHE
 static void v9fs_write_to_cache_done(void *priv, ssize_t transferred_or_error,
 				     bool was_async)
@@ -355,8 +326,8 @@  const struct address_space_operations v9fs_addr_operations = {
 	.writepage = v9fs_vfs_writepage,
 	.write_begin = v9fs_write_begin,
 	.write_end = v9fs_write_end,
-	.release_folio = v9fs_release_folio,
-	.invalidate_folio = v9fs_invalidate_folio,
+	.release_folio = netfs_release_folio,
+	.invalidate_folio = netfs_invalidate_folio,
 	.launder_folio = v9fs_launder_folio,
 	.direct_IO = v9fs_direct_IO,
 };
diff --git a/fs/afs/file.c b/fs/afs/file.c
index 0c49b3b6f214..3fea5cd8ef13 100644
--- a/fs/afs/file.c
+++ b/fs/afs/file.c
@@ -20,9 +20,6 @@ 
 
 static int afs_file_mmap(struct file *file, struct vm_area_struct *vma);
 static int afs_symlink_read_folio(struct file *file, struct folio *folio);
-static void afs_invalidate_folio(struct folio *folio, size_t offset,
-			       size_t length);
-static bool afs_release_folio(struct folio *folio, gfp_t gfp_flags);
 
 static ssize_t afs_file_read_iter(struct kiocb *iocb, struct iov_iter *iter);
 static ssize_t afs_file_splice_read(struct file *in, loff_t *ppos,
@@ -57,8 +54,8 @@  const struct address_space_operations afs_file_aops = {
 	.readahead	= netfs_readahead,
 	.dirty_folio	= afs_dirty_folio,
 	.launder_folio	= afs_launder_folio,
-	.release_folio	= afs_release_folio,
-	.invalidate_folio = afs_invalidate_folio,
+	.release_folio	= netfs_release_folio,
+	.invalidate_folio = netfs_invalidate_folio,
 	.write_begin	= afs_write_begin,
 	.write_end	= afs_write_end,
 	.writepages	= afs_writepages,
@@ -67,8 +64,8 @@  const struct address_space_operations afs_file_aops = {
 
 const struct address_space_operations afs_symlink_aops = {
 	.read_folio	= afs_symlink_read_folio,
-	.release_folio	= afs_release_folio,
-	.invalidate_folio = afs_invalidate_folio,
+	.release_folio	= netfs_release_folio,
+	.invalidate_folio = netfs_invalidate_folio,
 	.migrate_folio	= filemap_migrate_folio,
 };
 
@@ -405,48 +402,6 @@  int afs_write_inode(struct inode *inode, struct writeback_control *wbc)
 	return 0;
 }
 
-/*
- * invalidate part or all of a page
- * - release a page and clean up its private data if offset is 0 (indicating
- *   the entire page)
- */
-static void afs_invalidate_folio(struct folio *folio, size_t offset,
-			       size_t length)
-{
-	_enter("{%lu},%zu,%zu", folio->index, offset, length);
-
-	folio_wait_fscache(folio);
-	_leave("");
-}
-
-/*
- * release a page and clean up its private state if it's not busy
- * - return true if the page can now be released, false if not
- */
-static bool afs_release_folio(struct folio *folio, gfp_t gfp)
-{
-	struct afs_vnode *vnode = AFS_FS_I(folio_inode(folio));
-
-	_enter("{{%llx:%llu}[%lu],%lx},%x",
-	       vnode->fid.vid, vnode->fid.vnode, folio_index(folio), folio->flags,
-	       gfp);
-
-	/* deny if folio is being written to the cache and the caller hasn't
-	 * elected to wait */
-#ifdef CONFIG_AFS_FSCACHE
-	if (folio_test_fscache(folio)) {
-		if (current_is_kswapd() || !(gfp & __GFP_FS))
-			return false;
-		folio_wait_fscache(folio);
-	}
-	fscache_note_page_release(afs_vnode_cache(vnode));
-#endif
-
-	/* Indicate that the folio can be released */
-	_leave(" = T");
-	return true;
-}
-
 static void afs_add_open_mmap(struct afs_vnode *vnode)
 {
 	if (atomic_inc_return(&vnode->cb_nr_mmap) == 1) {
diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c
index f4863078f7fe..ced19ff08988 100644
--- a/fs/ceph/addr.c
+++ b/fs/ceph/addr.c
@@ -160,27 +160,7 @@  static void ceph_invalidate_folio(struct folio *folio, size_t offset,
 		ceph_put_snap_context(snapc);
 	}
 
-	folio_wait_fscache(folio);
-}
-
-static bool ceph_release_folio(struct folio *folio, gfp_t gfp)
-{
-	struct inode *inode = folio->mapping->host;
-
-	dout("%llx:%llx release_folio idx %lu (%sdirty)\n",
-	     ceph_vinop(inode),
-	     folio->index, folio_test_dirty(folio) ? "" : "not ");
-
-	if (folio_test_private(folio))
-		return false;
-
-	if (folio_test_fscache(folio)) {
-		if (current_is_kswapd() || !(gfp & __GFP_FS))
-			return false;
-		folio_wait_fscache(folio);
-	}
-	ceph_fscache_note_page_release(inode);
-	return true;
+	netfs_invalidate_folio(folio, offset, length);
 }
 
 static void ceph_netfs_expand_readahead(struct netfs_io_request *rreq)
@@ -1563,7 +1543,7 @@  const struct address_space_operations ceph_aops = {
 	.write_end = ceph_write_end,
 	.dirty_folio = ceph_dirty_folio,
 	.invalidate_folio = ceph_invalidate_folio,
-	.release_folio = ceph_release_folio,
+	.release_folio = netfs_release_folio,
 	.direct_IO = noop_direct_IO,
 };
 
diff --git a/fs/netfs/Makefile b/fs/netfs/Makefile
index 386d6fb92793..cd22554d9048 100644
--- a/fs/netfs/Makefile
+++ b/fs/netfs/Makefile
@@ -5,6 +5,7 @@  netfs-y := \
 	io.o \
 	iterator.o \
 	main.o \
+	misc.o \
 	objects.o
 
 netfs-$(CONFIG_NETFS_STATS) += stats.o
diff --git a/fs/netfs/misc.c b/fs/netfs/misc.c
new file mode 100644
index 000000000000..c3baf2b247d9
--- /dev/null
+++ b/fs/netfs/misc.c
@@ -0,0 +1,51 @@ 
+// SPDX-License-Identifier: GPL-2.0-only
+/* Miscellaneous routines.
+ *
+ * Copyright (C) 2022 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ */
+
+#include <linux/swap.h>
+#include "internal.h"
+
+/**
+ * netfs_invalidate_folio - Invalidate or partially invalidate a folio
+ * @folio: Folio proposed for release
+ * @offset: Offset of the invalidated region
+ * @length: Length of the invalidated region
+ *
+ * Invalidate part or all of a folio for a network filesystem.  The folio will
+ * be removed afterwards if the invalidated region covers the entire folio.
+ */
+void netfs_invalidate_folio(struct folio *folio, size_t offset, size_t length)
+{
+	_enter("{%lx},%zx,%zx", folio_index(folio), offset, length);
+
+	folio_wait_fscache(folio);
+}
+EXPORT_SYMBOL(netfs_invalidate_folio);
+
+/**
+ * netfs_release_folio - Try to release a folio
+ * @folio: Folio proposed for release
+ * @gfp: Flags qualifying the release
+ *
+ * Request release of a folio and clean up its private state if it's not busy.
+ * Returns true if the folio can now be released, false if not
+ */
+bool netfs_release_folio(struct folio *folio, gfp_t gfp)
+{
+	struct netfs_inode *ctx = netfs_inode(folio_inode(folio));
+
+	if (folio_test_private(folio))
+		return false;
+	if (folio_test_fscache(folio)) {
+		if (current_is_kswapd() || !(gfp & __GFP_FS))
+			return false;
+		folio_wait_fscache(folio);
+	}
+
+	fscache_note_page_release(netfs_i_cookie(ctx));
+	return true;
+}
+EXPORT_SYMBOL(netfs_release_folio);
diff --git a/include/linux/netfs.h b/include/linux/netfs.h
index ed64d1034afa..daa431c4148d 100644
--- a/include/linux/netfs.h
+++ b/include/linux/netfs.h
@@ -299,8 +299,10 @@  struct readahead_control;
 void netfs_readahead(struct readahead_control *);
 int netfs_read_folio(struct file *, struct folio *);
 int netfs_write_begin(struct netfs_inode *, struct file *,
-		struct address_space *, loff_t pos, unsigned int len,
-		struct folio **, void **fsdata);
+		      struct address_space *, loff_t pos, unsigned int len,
+		      struct folio **, void **fsdata);
+void netfs_invalidate_folio(struct folio *folio, size_t offset, size_t length);
+bool netfs_release_folio(struct folio *folio, gfp_t gfp);
 
 void netfs_subreq_terminated(struct netfs_io_subrequest *, ssize_t, bool);
 void netfs_get_subrequest(struct netfs_io_subrequest *subreq,