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Subject[PATCH v2 12/19] netfs: Add a netfs inode context
From
Date
Add a netfs_i_context struct that should be included in the network
filesystem's own inode struct wrapper, directly after the VFS's inode
struct, e.g.:

struct my_inode {
struct {
struct inode vfs_inode;
struct netfs_i_context netfs_ctx;
};
};

The netfs_i_context struct so far contains a single field for the network
filesystem to use - the cache cookie:

struct netfs_i_context {
...
struct fscache_cookie *cache;
};

Three functions are provided to help with this:

(1) void netfs_i_context_init(struct inode *inode,
const struct netfs_request_ops *ops);

Initialise the netfs context and set the operations.

(2) struct netfs_i_context *netfs_i_context(struct inode *inode);

Find the netfs context from the VFS inode.

(3) struct inode *netfs_inode(struct netfs_i_context *ctx);

Find the VFS inode from the netfs context.

Changes
=======
ver #2)
- Adjust documentation to match.
- Use "#if IS_ENABLED()" in netfs_i_cookie(), not "#ifdef".
- Move the cap check from ceph_readahead() to ceph_init_request() to be
called from netfslib.
- Remove ceph_readahead() and use netfs_readahead() directly instead.

Signed-off-by: David Howells <dhowells@redhat.com>
cc: linux-cachefs@redhat.com

Link: https://lore.kernel.org/r/164622984545.3564931.15691742939278418580.stgit@warthog.procyon.org.uk/ # v1
---

Documentation/filesystems/netfs_library.rst | 100 +++++++++++++++++++--------
fs/9p/cache.c | 10 +--
fs/9p/v9fs.c | 4 -
fs/9p/v9fs.h | 12 ++-
fs/9p/vfs_addr.c | 43 +-----------
fs/9p/vfs_inode.c | 13 +++-
fs/afs/dynroot.c | 1
fs/afs/file.c | 26 +------
fs/afs/inode.c | 31 +++++---
fs/afs/internal.h | 19 ++++-
fs/afs/super.c | 4 -
fs/afs/write.c | 3 -
fs/ceph/addr.c | 95 +++++++++++---------------
fs/ceph/cache.c | 28 ++++----
fs/ceph/cache.h | 11 ---
fs/ceph/inode.c | 6 +-
fs/ceph/super.h | 16 ++--
fs/cifs/cifsglob.h | 10 ++-
fs/cifs/fscache.c | 11 ++-
fs/cifs/fscache.h | 2 -
fs/netfs/internal.h | 17 ++++-
fs/netfs/objects.c | 12 ++-
fs/netfs/read_helper.c | 100 ++++++++++++---------------
fs/netfs/stats.c | 1
include/linux/netfs.h | 81 +++++++++++++++++++---
25 files changed, 351 insertions(+), 305 deletions(-)

diff --git a/Documentation/filesystems/netfs_library.rst b/Documentation/filesystems/netfs_library.rst
index 4eb7e7b7b0fc..dc716415c7a2 100644
--- a/Documentation/filesystems/netfs_library.rst
+++ b/Documentation/filesystems/netfs_library.rst
@@ -7,6 +7,8 @@ Network Filesystem Helper Library
.. Contents:

- Overview.
+ - Per-inode context.
+ - Inode context helper functions.
- Buffered read helpers.
- Read helper functions.
- Read helper structures.
@@ -28,6 +30,68 @@ Note that the library module doesn't link against local caching directly, so
access must be provided by the netfs.


+Per-Inode Context
+=================
+
+The network filesystem helper library needs a place to store a bit of state for
+its use on each netfs inode it is helping to manage. To this end, a context
+structure is defined::
+
+ struct netfs_i_context {
+ const struct netfs_request_ops *ops;
+ struct fscache_cookie *cache;
+ };
+
+A network filesystem that wants to use netfs lib must place one of these
+directly after the VFS ``struct inode`` it allocates, usually as part of its
+own struct. This can be done in a way similar to the following::
+
+ struct my_inode {
+ struct {
+ struct inode vfs_inode;
+ struct netfs_i_context netfs_ctx;
+ };
+ ...
+ };
+
+This allows netfslib to find its state by simple offset from the inode pointer,
+thereby allowing the netfslib helper functions to be pointed to directly by the
+VFS/VM operation tables.
+
+The structure contains the following fields:
+
+ * ``ops``
+
+ The set of operations provided by the network filesystem to netfslib.
+
+ * ``cache``
+
+ Local caching cookie, or NULL if no caching is enabled. This field does not
+ exist if fscache is disabled.
+
+
+Inode Context Helper Functions
+------------------------------
+
+To help deal with the per-inode context, a number helper functions are
+provided. Firstly, a function to perform basic initialisation on a context and
+set the operations table pointer::
+
+ void netfs_i_context_init(struct inode *inode,
+ const struct netfs_request_ops *ops);
+
+then two functions to cast between the VFS inode structure and the netfs
+context::
+
+ struct netfs_i_context *netfs_i_context(struct inode *inode);
+ struct inode *netfs_inode(struct netfs_i_context *ctx);
+
+and finally, a function to get the cache cookie pointer from the context
+attached to an inode (or NULL if fscache is disabled)::
+
+ struct fscache_cookie *netfs_i_cookie(struct inode *inode);
+
+
Buffered Read Helpers
=====================

@@ -70,38 +134,22 @@ Read Helper Functions

Three read helpers are provided::

- void netfs_readahead(struct readahead_control *ractl,
- const struct netfs_request_ops *ops,
- void *netfs_priv);
+ void netfs_readahead(struct readahead_control *ractl);
int netfs_readpage(struct file *file,
- struct folio *folio,
- const struct netfs_request_ops *ops,
- void *netfs_priv);
+ struct page *page);
int netfs_write_begin(struct file *file,
struct address_space *mapping,
loff_t pos,
unsigned int len,
unsigned int flags,
struct folio **_folio,
- void **_fsdata,
- const struct netfs_request_ops *ops,
- void *netfs_priv);
-
-Each corresponds to a VM operation, with the addition of a couple of parameters
-for the use of the read helpers:
+ void **_fsdata);

- * ``ops``
-
- A table of operations through which the helpers can talk to the filesystem.
-
- * ``netfs_priv``
+Each corresponds to a VM address space operation. These operations use the
+state in the per-inode context.

- Filesystem private data (can be NULL).
-
-Both of these values will be stored into the read request structure.
-
-For ->readahead() and ->readpage(), the network filesystem should just jump
-into the corresponding read helper; whereas for ->write_begin(), it may be a
+For ->readahead() and ->readpage(), the network filesystem just point directly
+at the corresponding read helper; whereas for ->write_begin(), it may be a
little more complicated as the network filesystem might want to flush
conflicting writes or track dirty data and needs to put the acquired folio if
an error occurs after calling the helper.
@@ -246,7 +294,6 @@ through which it can issue requests and negotiate::

struct netfs_request_ops {
void (*init_request)(struct netfs_io_request *rreq, struct file *file);
- bool (*is_cache_enabled)(struct inode *inode);
int (*begin_cache_operation)(struct netfs_io_request *rreq);
void (*expand_readahead)(struct netfs_io_request *rreq);
bool (*clamp_length)(struct netfs_io_subrequest *subreq);
@@ -265,11 +312,6 @@ The operations are as follows:
[Optional] This is called to initialise the request structure. It is given
the file for reference and can modify the ->netfs_priv value.

- * ``is_cache_enabled()``
-
- [Required] This is called by netfs_write_begin() to ask if the file is being
- cached. It should return true if it is being cached and false otherwise.
-
* ``begin_cache_operation()``

[Optional] This is called to ask the network filesystem to call into the
diff --git a/fs/9p/cache.c b/fs/9p/cache.c
index 55e108e5e133..1c8dc696d516 100644
--- a/fs/9p/cache.c
+++ b/fs/9p/cache.c
@@ -49,22 +49,20 @@ int v9fs_cache_session_get_cookie(struct v9fs_session_info *v9ses,

void v9fs_cache_inode_get_cookie(struct inode *inode)
{
- struct v9fs_inode *v9inode;
+ struct v9fs_inode *v9inode = V9FS_I(inode);
struct v9fs_session_info *v9ses;
__le32 version;
__le64 path;

if (!S_ISREG(inode->i_mode))
return;
-
- v9inode = V9FS_I(inode);
- if (WARN_ON(v9inode->fscache))
+ if (WARN_ON(v9fs_inode_cookie(v9inode)))
return;

version = cpu_to_le32(v9inode->qid.version);
path = cpu_to_le64(v9inode->qid.path);
v9ses = v9fs_inode2v9ses(inode);
- v9inode->fscache =
+ v9inode->netfs_ctx.cache =
fscache_acquire_cookie(v9fs_session_cache(v9ses),
0,
&path, sizeof(path),
@@ -72,5 +70,5 @@ void v9fs_cache_inode_get_cookie(struct inode *inode)
i_size_read(&v9inode->vfs_inode));

p9_debug(P9_DEBUG_FSC, "inode %p get cookie %p\n",
- inode, v9inode->fscache);
+ inode, v9fs_inode_cookie(v9inode));
}
diff --git a/fs/9p/v9fs.c b/fs/9p/v9fs.c
index 08f65c40af4f..e28ddf763b3b 100644
--- a/fs/9p/v9fs.c
+++ b/fs/9p/v9fs.c
@@ -623,9 +623,7 @@ static void v9fs_sysfs_cleanup(void)
static void v9fs_inode_init_once(void *foo)
{
struct v9fs_inode *v9inode = (struct v9fs_inode *)foo;
-#ifdef CONFIG_9P_FSCACHE
- v9inode->fscache = NULL;
-#endif
+
memset(&v9inode->qid, 0, sizeof(v9inode->qid));
inode_init_once(&v9inode->vfs_inode);
}
diff --git a/fs/9p/v9fs.h b/fs/9p/v9fs.h
index bc8b30205d36..8a8d363dfdab 100644
--- a/fs/9p/v9fs.h
+++ b/fs/9p/v9fs.h
@@ -9,6 +9,7 @@
#define FS_9P_V9FS_H

#include <linux/backing-dev.h>
+#include <linux/netfs.h>

/**
* enum p9_session_flags - option flags for each 9P session
@@ -108,14 +109,14 @@ struct v9fs_session_info {
#define V9FS_INO_INVALID_ATTR 0x01

struct v9fs_inode {
-#ifdef CONFIG_9P_FSCACHE
- struct fscache_cookie *fscache;
-#endif
+ struct {
+ struct inode vfs_inode; /* the VFS's inode record */
+ struct netfs_i_context netfs_ctx; /* Netfslib context */
+ };
struct p9_qid qid;
unsigned int cache_validity;
struct p9_fid *writeback_fid;
struct mutex v_mutex;
- struct inode vfs_inode;
};

static inline struct v9fs_inode *V9FS_I(const struct inode *inode)
@@ -126,7 +127,7 @@ static inline struct v9fs_inode *V9FS_I(const struct inode *inode)
static inline struct fscache_cookie *v9fs_inode_cookie(struct v9fs_inode *v9inode)
{
#ifdef CONFIG_9P_FSCACHE
- return v9inode->fscache;
+ return netfs_i_cookie(&v9inode->vfs_inode);
#else
return NULL;
#endif
@@ -163,6 +164,7 @@ extern struct inode *v9fs_inode_from_fid(struct v9fs_session_info *v9ses,
extern const struct inode_operations v9fs_dir_inode_operations_dotl;
extern const struct inode_operations v9fs_file_inode_operations_dotl;
extern const struct inode_operations v9fs_symlink_inode_operations_dotl;
+extern const struct netfs_request_ops v9fs_req_ops;
extern struct inode *v9fs_inode_from_fid_dotl(struct v9fs_session_info *v9ses,
struct p9_fid *fid,
struct super_block *sb, int new);
diff --git a/fs/9p/vfs_addr.c b/fs/9p/vfs_addr.c
index 91d3926c9559..ed06f3c34e98 100644
--- a/fs/9p/vfs_addr.c
+++ b/fs/9p/vfs_addr.c
@@ -77,17 +77,6 @@ static void v9fs_req_cleanup(struct address_space *mapping, void *priv)
p9_client_clunk(fid);
}

-/**
- * v9fs_is_cache_enabled - Determine if caching is enabled for an inode
- * @inode: The inode to check
- */
-static bool v9fs_is_cache_enabled(struct inode *inode)
-{
- struct fscache_cookie *cookie = v9fs_inode_cookie(V9FS_I(inode));
-
- return fscache_cookie_enabled(cookie) && cookie->cache_priv;
-}
-
/**
* v9fs_begin_cache_operation - Begin a cache operation for a read
* @rreq: The read request
@@ -103,36 +92,13 @@ static int v9fs_begin_cache_operation(struct netfs_io_request *rreq)
#endif
}

-static const struct netfs_request_ops v9fs_req_ops = {
+const struct netfs_request_ops v9fs_req_ops = {
.init_request = v9fs_init_request,
- .is_cache_enabled = v9fs_is_cache_enabled,
.begin_cache_operation = v9fs_begin_cache_operation,
.issue_read = v9fs_issue_read,
.cleanup = v9fs_req_cleanup,
};

-/**
- * v9fs_vfs_readpage - read an entire page in from 9P
- * @file: file being read
- * @page: structure to page
- *
- */
-static int v9fs_vfs_readpage(struct file *file, struct page *page)
-{
- struct folio *folio = page_folio(page);
-
- return netfs_readpage(file, folio, &v9fs_req_ops, NULL);
-}
-
-/**
- * v9fs_vfs_readahead - read a set of pages from 9P
- * @ractl: The readahead parameters
- */
-static void v9fs_vfs_readahead(struct readahead_control *ractl)
-{
- netfs_readahead(ractl, &v9fs_req_ops, NULL);
-}
-
/**
* v9fs_release_page - release the private state associated with a page
* @page: The page to be released
@@ -326,8 +292,7 @@ static int v9fs_write_begin(struct file *filp, struct address_space *mapping,
* file. We need to do this before we get a lock on the page in case
* there's more than one writer competing for the same cache block.
*/
- retval = netfs_write_begin(filp, mapping, pos, len, flags, &folio, fsdata,
- &v9fs_req_ops, NULL);
+ retval = netfs_write_begin(filp, mapping, pos, len, flags, &folio, fsdata);
if (retval < 0)
return retval;

@@ -388,8 +353,8 @@ static int v9fs_set_page_dirty(struct page *page)
#endif

const struct address_space_operations v9fs_addr_operations = {
- .readpage = v9fs_vfs_readpage,
- .readahead = v9fs_vfs_readahead,
+ .readpage = netfs_readpage,
+ .readahead = netfs_readahead,
.set_page_dirty = v9fs_set_page_dirty,
.writepage = v9fs_vfs_writepage,
.write_begin = v9fs_write_begin,
diff --git a/fs/9p/vfs_inode.c b/fs/9p/vfs_inode.c
index 2a10242c79c7..a7dc6781a622 100644
--- a/fs/9p/vfs_inode.c
+++ b/fs/9p/vfs_inode.c
@@ -231,9 +231,6 @@ struct inode *v9fs_alloc_inode(struct super_block *sb)
v9inode = kmem_cache_alloc(v9fs_inode_cache, GFP_KERNEL);
if (!v9inode)
return NULL;
-#ifdef CONFIG_9P_FSCACHE
- v9inode->fscache = NULL;
-#endif
v9inode->writeback_fid = NULL;
v9inode->cache_validity = 0;
mutex_init(&v9inode->v_mutex);
@@ -250,6 +247,14 @@ void v9fs_free_inode(struct inode *inode)
kmem_cache_free(v9fs_inode_cache, V9FS_I(inode));
}

+/*
+ * Set parameters for the netfs library
+ */
+static void v9fs_set_netfs_context(struct inode *inode)
+{
+ netfs_i_context_init(inode, &v9fs_req_ops);
+}
+
int v9fs_init_inode(struct v9fs_session_info *v9ses,
struct inode *inode, umode_t mode, dev_t rdev)
{
@@ -338,6 +343,8 @@ int v9fs_init_inode(struct v9fs_session_info *v9ses,
err = -EINVAL;
goto error;
}
+
+ v9fs_set_netfs_context(inode);
error:
return err;

diff --git a/fs/afs/dynroot.c b/fs/afs/dynroot.c
index db832cc931c8..f120bcb8bf73 100644
--- a/fs/afs/dynroot.c
+++ b/fs/afs/dynroot.c
@@ -76,6 +76,7 @@ struct inode *afs_iget_pseudo_dir(struct super_block *sb, bool root)
/* there shouldn't be an existing inode */
BUG_ON(!(inode->i_state & I_NEW));

+ netfs_i_context_init(inode, NULL);
inode->i_size = 0;
inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
if (root) {
diff --git a/fs/afs/file.c b/fs/afs/file.c
index 6469d7f98ef5..2b68b2070248 100644
--- a/fs/afs/file.c
+++ b/fs/afs/file.c
@@ -19,13 +19,11 @@
#include "internal.h"

static int afs_file_mmap(struct file *file, struct vm_area_struct *vma);
-static int afs_readpage(struct file *file, struct page *page);
static int afs_symlink_readpage(struct file *file, struct page *page);
static void afs_invalidatepage(struct page *page, unsigned int offset,
unsigned int length);
static int afs_releasepage(struct page *page, gfp_t gfp_flags);

-static void afs_readahead(struct readahead_control *ractl);
static ssize_t afs_file_read_iter(struct kiocb *iocb, struct iov_iter *iter);
static void afs_vm_open(struct vm_area_struct *area);
static void afs_vm_close(struct vm_area_struct *area);
@@ -52,8 +50,8 @@ const struct inode_operations afs_file_inode_operations = {
};

const struct address_space_operations afs_file_aops = {
- .readpage = afs_readpage,
- .readahead = afs_readahead,
+ .readpage = netfs_readpage,
+ .readahead = netfs_readahead,
.set_page_dirty = afs_set_page_dirty,
.launder_page = afs_launder_page,
.releasepage = afs_releasepage,
@@ -365,13 +363,6 @@ static int afs_init_request(struct netfs_io_request *rreq, struct file *file)
return 0;
}

-static bool afs_is_cache_enabled(struct inode *inode)
-{
- struct fscache_cookie *cookie = afs_vnode_cache(AFS_FS_I(inode));
-
- return fscache_cookie_enabled(cookie) && cookie->cache_priv;
-}
-
static int afs_begin_cache_operation(struct netfs_io_request *rreq)
{
#ifdef CONFIG_AFS_FSCACHE
@@ -399,25 +390,12 @@ static void afs_priv_cleanup(struct address_space *mapping, void *netfs_priv)

const struct netfs_request_ops afs_req_ops = {
.init_request = afs_init_request,
- .is_cache_enabled = afs_is_cache_enabled,
.begin_cache_operation = afs_begin_cache_operation,
.check_write_begin = afs_check_write_begin,
.issue_read = afs_issue_read,
.cleanup = afs_priv_cleanup,
};

-static int afs_readpage(struct file *file, struct page *page)
-{
- struct folio *folio = page_folio(page);
-
- return netfs_readpage(file, folio, &afs_req_ops, NULL);
-}
-
-static void afs_readahead(struct readahead_control *ractl)
-{
- netfs_readahead(ractl, &afs_req_ops, NULL);
-}
-
int afs_write_inode(struct inode *inode, struct writeback_control *wbc)
{
fscache_unpin_writeback(wbc, afs_vnode_cache(AFS_FS_I(inode)));
diff --git a/fs/afs/inode.c b/fs/afs/inode.c
index 5964f8aee090..5b5e40197655 100644
--- a/fs/afs/inode.c
+++ b/fs/afs/inode.c
@@ -53,6 +53,14 @@ static noinline void dump_vnode(struct afs_vnode *vnode, struct afs_vnode *paren
dump_stack();
}

+/*
+ * Set parameters for the netfs library
+ */
+static void afs_set_netfs_context(struct afs_vnode *vnode)
+{
+ netfs_i_context_init(&vnode->vfs_inode, &afs_req_ops);
+}
+
/*
* Initialise an inode from the vnode status.
*/
@@ -128,6 +136,7 @@ static int afs_inode_init_from_status(struct afs_operation *op,
}

afs_set_i_size(vnode, status->size);
+ afs_set_netfs_context(vnode);

vnode->invalid_before = status->data_version;
inode_set_iversion_raw(&vnode->vfs_inode, status->data_version);
@@ -420,7 +429,7 @@ static void afs_get_inode_cache(struct afs_vnode *vnode)
struct afs_vnode_cache_aux aux;

if (vnode->status.type != AFS_FTYPE_FILE) {
- vnode->cache = NULL;
+ vnode->netfs_ctx.cache = NULL;
return;
}

@@ -430,12 +439,14 @@ static void afs_get_inode_cache(struct afs_vnode *vnode)
key.vnode_id_ext[1] = htonl(vnode->fid.vnode_hi);
afs_set_cache_aux(vnode, &aux);

- vnode->cache = fscache_acquire_cookie(
- vnode->volume->cache,
- vnode->status.type == AFS_FTYPE_FILE ? 0 : FSCACHE_ADV_SINGLE_CHUNK,
- &key, sizeof(key),
- &aux, sizeof(aux),
- vnode->status.size);
+ afs_vnode_set_cache(vnode,
+ fscache_acquire_cookie(
+ vnode->volume->cache,
+ vnode->status.type == AFS_FTYPE_FILE ?
+ 0 : FSCACHE_ADV_SINGLE_CHUNK,
+ &key, sizeof(key),
+ &aux, sizeof(aux),
+ vnode->status.size));
#endif
}

@@ -528,6 +539,7 @@ struct inode *afs_root_iget(struct super_block *sb, struct key *key)

vnode = AFS_FS_I(inode);
vnode->cb_v_break = as->volume->cb_v_break,
+ afs_set_netfs_context(vnode);

op = afs_alloc_operation(key, as->volume);
if (IS_ERR(op)) {
@@ -786,11 +798,8 @@ void afs_evict_inode(struct inode *inode)
afs_put_wb_key(wbk);
}

-#ifdef CONFIG_AFS_FSCACHE
- fscache_relinquish_cookie(vnode->cache,
+ fscache_relinquish_cookie(afs_vnode_cache(vnode),
test_bit(AFS_VNODE_DELETED, &vnode->flags));
- vnode->cache = NULL;
-#endif

afs_prune_wb_keys(vnode);
afs_put_permits(rcu_access_pointer(vnode->permit_cache));
diff --git a/fs/afs/internal.h b/fs/afs/internal.h
index c56a0e1719ae..75ca3026457e 100644
--- a/fs/afs/internal.h
+++ b/fs/afs/internal.h
@@ -619,15 +619,16 @@ enum afs_lock_state {
* leak from one inode to another.
*/
struct afs_vnode {
- struct inode vfs_inode; /* the VFS's inode record */
+ struct {
+ /* These must be contiguous */
+ struct inode vfs_inode; /* the VFS's inode record */
+ struct netfs_i_context netfs_ctx; /* Netfslib context */
+ };

struct afs_volume *volume; /* volume on which vnode resides */
struct afs_fid fid; /* the file identifier for this inode */
struct afs_file_status status; /* AFS status info for this file */
afs_dataversion_t invalid_before; /* Child dentries are invalid before this */
-#ifdef CONFIG_AFS_FSCACHE
- struct fscache_cookie *cache; /* caching cookie */
-#endif
struct afs_permits __rcu *permit_cache; /* cache of permits so far obtained */
struct mutex io_lock; /* Lock for serialising I/O on this mutex */
struct rw_semaphore validate_lock; /* lock for validating this vnode */
@@ -674,12 +675,20 @@ struct afs_vnode {
static inline struct fscache_cookie *afs_vnode_cache(struct afs_vnode *vnode)
{
#ifdef CONFIG_AFS_FSCACHE
- return vnode->cache;
+ return netfs_i_cookie(&vnode->vfs_inode);
#else
return NULL;
#endif
}

+static inline void afs_vnode_set_cache(struct afs_vnode *vnode,
+ struct fscache_cookie *cookie)
+{
+#ifdef CONFIG_AFS_FSCACHE
+ vnode->netfs_ctx.cache = cookie;
+#endif
+}
+
/*
* cached security record for one user's attempt to access a vnode
*/
diff --git a/fs/afs/super.c b/fs/afs/super.c
index 5ec9fd97eccc..e66c6f54ac8e 100644
--- a/fs/afs/super.c
+++ b/fs/afs/super.c
@@ -688,13 +688,11 @@ static struct inode *afs_alloc_inode(struct super_block *sb)
/* Reset anything that shouldn't leak from one inode to the next. */
memset(&vnode->fid, 0, sizeof(vnode->fid));
memset(&vnode->status, 0, sizeof(vnode->status));
+ afs_vnode_set_cache(vnode, NULL);

vnode->volume = NULL;
vnode->lock_key = NULL;
vnode->permit_cache = NULL;
-#ifdef CONFIG_AFS_FSCACHE
- vnode->cache = NULL;
-#endif

vnode->flags = 1 << AFS_VNODE_UNSET;
vnode->lock_state = AFS_VNODE_LOCK_NONE;
diff --git a/fs/afs/write.c b/fs/afs/write.c
index 5e9157d0da29..e4b47f67a408 100644
--- a/fs/afs/write.c
+++ b/fs/afs/write.c
@@ -59,8 +59,7 @@ int afs_write_begin(struct file *file, struct address_space *mapping,
* file. We need to do this before we get a lock on the page in case
* there's more than one writer competing for the same cache block.
*/
- ret = netfs_write_begin(file, mapping, pos, len, flags, &folio, fsdata,
- &afs_req_ops, NULL);
+ ret = netfs_write_begin(file, mapping, pos, len, flags, &folio, fsdata);
if (ret < 0)
return ret;

diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c
index 9189257476f8..a758c106c533 100644
--- a/fs/ceph/addr.c
+++ b/fs/ceph/addr.c
@@ -354,6 +354,42 @@ static void ceph_netfs_issue_read(struct netfs_io_subrequest *subreq)
dout("%s: result %d\n", __func__, err);
}

+static int ceph_init_request(struct netfs_io_request *rreq, struct file *file)
+{
+ struct inode *inode = rreq->inode;
+ int got = 0, want = CEPH_CAP_FILE_CACHE;
+ int ret = 0;
+
+ if (file) {
+ struct ceph_rw_context *rw_ctx;
+ struct ceph_file_info *fi = file->private_data;
+
+ rw_ctx = ceph_find_rw_context(fi);
+ if (rw_ctx)
+ return 0;
+ }
+
+ if (rreq->origin != NETFS_READAHEAD)
+ return 0;
+
+ /*
+ * readahead callers do not necessarily hold Fcb caps
+ * (e.g. fadvise, madvise).
+ */
+ ret = ceph_try_get_caps(inode, CEPH_CAP_FILE_RD, want, true, &got);
+ if (ret < 0) {
+ dout("start_read %p, error getting cap\n", inode);
+ return ret;
+ }
+
+ if (!(got & want)) {
+ dout("start_read %p, no cache cap\n", inode);
+ return -EACCES;
+ }
+
+ return ret == 1 ? 0 : -EACCES;
+}
+
static void ceph_readahead_cleanup(struct address_space *mapping, void *priv)
{
struct inode *inode = mapping->host;
@@ -364,8 +400,8 @@ static void ceph_readahead_cleanup(struct address_space *mapping, void *priv)
ceph_put_cap_refs(ci, got);
}

-static const struct netfs_request_ops ceph_netfs_read_ops = {
- .is_cache_enabled = ceph_is_cache_enabled,
+const struct netfs_request_ops ceph_netfs_ops = {
+ .init_request = ceph_init_request,
.begin_cache_operation = ceph_begin_cache_operation,
.issue_read = ceph_netfs_issue_read,
.expand_readahead = ceph_netfs_expand_readahead,
@@ -374,54 +410,6 @@ static const struct netfs_request_ops ceph_netfs_read_ops = {
.cleanup = ceph_readahead_cleanup,
};

-/* read a single page, without unlocking it. */
-static int ceph_readpage(struct file *file, struct page *subpage)
-{
- struct folio *folio = page_folio(subpage);
- struct inode *inode = file_inode(file);
- struct ceph_inode_info *ci = ceph_inode(inode);
- struct ceph_vino vino = ceph_vino(inode);
- size_t len = folio_size(folio);
- u64 off = folio_file_pos(folio);
-
- dout("readpage ino %llx.%llx file %p off %llu len %zu folio %p index %lu\n inline %d",
- vino.ino, vino.snap, file, off, len, folio, folio_index(folio),
- ci->i_inline_version != CEPH_INLINE_NONE);
-
- return netfs_readpage(file, folio, &ceph_netfs_read_ops, NULL);
-}
-
-static void ceph_readahead(struct readahead_control *ractl)
-{
- struct inode *inode = file_inode(ractl->file);
- struct ceph_file_info *fi = ractl->file->private_data;
- struct ceph_rw_context *rw_ctx;
- int got = 0;
- int ret = 0;
-
- if (ceph_inode(inode)->i_inline_version != CEPH_INLINE_NONE)
- return;
-
- rw_ctx = ceph_find_rw_context(fi);
- if (!rw_ctx) {
- /*
- * readahead callers do not necessarily hold Fcb caps
- * (e.g. fadvise, madvise).
- */
- int want = CEPH_CAP_FILE_CACHE;
-
- ret = ceph_try_get_caps(inode, CEPH_CAP_FILE_RD, want, true, &got);
- if (ret < 0)
- dout("start_read %p, error getting cap\n", inode);
- else if (!(got & want))
- dout("start_read %p, no cache cap\n", inode);
-
- if (ret <= 0)
- return;
- }
- netfs_readahead(ractl, &ceph_netfs_read_ops, (void *)(uintptr_t)got);
-}
-
#ifdef CONFIG_CEPH_FSCACHE
static void ceph_set_page_fscache(struct page *page)
{
@@ -1320,8 +1308,7 @@ static int ceph_write_begin(struct file *file, struct address_space *mapping,
struct folio *folio = NULL;
int r;

- r = netfs_write_begin(file, inode->i_mapping, pos, len, 0, &folio, NULL,
- &ceph_netfs_read_ops, NULL);
+ r = netfs_write_begin(file, inode->i_mapping, pos, len, 0, &folio, NULL);
if (r == 0)
folio_wait_fscache(folio);
if (r < 0) {
@@ -1375,8 +1362,8 @@ static int ceph_write_end(struct file *file, struct address_space *mapping,
}

const struct address_space_operations ceph_aops = {
- .readpage = ceph_readpage,
- .readahead = ceph_readahead,
+ .readpage = netfs_readpage,
+ .readahead = netfs_readahead,
.writepage = ceph_writepage,
.writepages = ceph_writepages_start,
.write_begin = ceph_write_begin,
diff --git a/fs/ceph/cache.c b/fs/ceph/cache.c
index 7d22850623ef..ddea99922073 100644
--- a/fs/ceph/cache.c
+++ b/fs/ceph/cache.c
@@ -29,26 +29,25 @@ void ceph_fscache_register_inode_cookie(struct inode *inode)
if (!(inode->i_state & I_NEW))
return;

- WARN_ON_ONCE(ci->fscache);
+ WARN_ON_ONCE(ci->netfs_ctx.cache);

- ci->fscache = fscache_acquire_cookie(fsc->fscache, 0,
- &ci->i_vino, sizeof(ci->i_vino),
- &ci->i_version, sizeof(ci->i_version),
- i_size_read(inode));
+ ci->netfs_ctx.cache =
+ fscache_acquire_cookie(fsc->fscache, 0,
+ &ci->i_vino, sizeof(ci->i_vino),
+ &ci->i_version, sizeof(ci->i_version),
+ i_size_read(inode));
}

-void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info* ci)
+void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info *ci)
{
- struct fscache_cookie *cookie = ci->fscache;
-
- fscache_relinquish_cookie(cookie, false);
+ fscache_relinquish_cookie(ceph_fscache_cookie(ci), false);
}

void ceph_fscache_use_cookie(struct inode *inode, bool will_modify)
{
struct ceph_inode_info *ci = ceph_inode(inode);

- fscache_use_cookie(ci->fscache, will_modify);
+ fscache_use_cookie(ceph_fscache_cookie(ci), will_modify);
}

void ceph_fscache_unuse_cookie(struct inode *inode, bool update)
@@ -58,9 +57,10 @@ void ceph_fscache_unuse_cookie(struct inode *inode, bool update)
if (update) {
loff_t i_size = i_size_read(inode);

- fscache_unuse_cookie(ci->fscache, &ci->i_version, &i_size);
+ fscache_unuse_cookie(ceph_fscache_cookie(ci),
+ &ci->i_version, &i_size);
} else {
- fscache_unuse_cookie(ci->fscache, NULL, NULL);
+ fscache_unuse_cookie(ceph_fscache_cookie(ci), NULL, NULL);
}
}

@@ -69,14 +69,14 @@ void ceph_fscache_update(struct inode *inode)
struct ceph_inode_info *ci = ceph_inode(inode);
loff_t i_size = i_size_read(inode);

- fscache_update_cookie(ci->fscache, &ci->i_version, &i_size);
+ fscache_update_cookie(ceph_fscache_cookie(ci), &ci->i_version, &i_size);
}

void ceph_fscache_invalidate(struct inode *inode, bool dio_write)
{
struct ceph_inode_info *ci = ceph_inode(inode);

- fscache_invalidate(ceph_inode(inode)->fscache,
+ fscache_invalidate(ceph_fscache_cookie(ci),
&ci->i_version, i_size_read(inode),
dio_write ? FSCACHE_INVAL_DIO_WRITE : 0);
}
diff --git a/fs/ceph/cache.h b/fs/ceph/cache.h
index b8b3b5cb6438..c20e43cade94 100644
--- a/fs/ceph/cache.h
+++ b/fs/ceph/cache.h
@@ -26,14 +26,9 @@ void ceph_fscache_unuse_cookie(struct inode *inode, bool update);
void ceph_fscache_update(struct inode *inode);
void ceph_fscache_invalidate(struct inode *inode, bool dio_write);

-static inline void ceph_fscache_inode_init(struct ceph_inode_info *ci)
-{
- ci->fscache = NULL;
-}
-
static inline struct fscache_cookie *ceph_fscache_cookie(struct ceph_inode_info *ci)
{
- return ci->fscache;
+ return netfs_i_cookie(&ci->vfs_inode);
}

static inline void ceph_fscache_resize(struct inode *inode, loff_t to)
@@ -91,10 +86,6 @@ static inline void ceph_fscache_unregister_fs(struct ceph_fs_client* fsc)
{
}

-static inline void ceph_fscache_inode_init(struct ceph_inode_info *ci)
-{
-}
-
static inline void ceph_fscache_register_inode_cookie(struct inode *inode)
{
}
diff --git a/fs/ceph/inode.c b/fs/ceph/inode.c
index 7b1e93c8a0d2..6a176d9d394a 100644
--- a/fs/ceph/inode.c
+++ b/fs/ceph/inode.c
@@ -453,6 +453,9 @@ struct inode *ceph_alloc_inode(struct super_block *sb)

dout("alloc_inode %p\n", &ci->vfs_inode);

+ /* Set parameters for the netfs library */
+ netfs_i_context_init(&ci->vfs_inode, &ceph_netfs_ops);
+
spin_lock_init(&ci->i_ceph_lock);

ci->i_version = 0;
@@ -538,9 +541,6 @@ struct inode *ceph_alloc_inode(struct super_block *sb)
INIT_WORK(&ci->i_work, ceph_inode_work);
ci->i_work_mask = 0;
memset(&ci->i_btime, '\0', sizeof(ci->i_btime));
-
- ceph_fscache_inode_init(ci);
-
return &ci->vfs_inode;
}

diff --git a/fs/ceph/super.h b/fs/ceph/super.h
index 0b4b519682f1..f9f01ed6ffee 100644
--- a/fs/ceph/super.h
+++ b/fs/ceph/super.h
@@ -17,13 +17,11 @@
#include <linux/posix_acl.h>
#include <linux/refcount.h>
#include <linux/security.h>
+#include <linux/netfs.h>
+#include <linux/fscache.h>

#include <linux/ceph/libceph.h>

-#ifdef CONFIG_CEPH_FSCACHE
-#include <linux/fscache.h>
-#endif
-
/* large granularity for statfs utilization stats to facilitate
* large volume sizes on 32-bit machines. */
#define CEPH_BLOCK_SHIFT 22 /* 4 MB */
@@ -317,6 +315,10 @@ struct ceph_inode_xattrs_info {
* Ceph inode.
*/
struct ceph_inode_info {
+ struct {
+ struct inode vfs_inode;
+ struct netfs_i_context netfs_ctx; /* Netfslib context */
+ };
struct ceph_vino i_vino; /* ceph ino + snap */

spinlock_t i_ceph_lock;
@@ -427,11 +429,6 @@ struct ceph_inode_info {

struct work_struct i_work;
unsigned long i_work_mask;
-
-#ifdef CONFIG_CEPH_FSCACHE
- struct fscache_cookie *fscache;
-#endif
- struct inode vfs_inode; /* at end */
};

static inline struct ceph_inode_info *
@@ -1215,6 +1212,7 @@ extern void __ceph_touch_fmode(struct ceph_inode_info *ci,

/* addr.c */
extern const struct address_space_operations ceph_aops;
+extern const struct netfs_request_ops ceph_netfs_ops;
extern int ceph_mmap(struct file *file, struct vm_area_struct *vma);
extern int ceph_uninline_data(struct file *file);
extern int ceph_pool_perm_check(struct inode *inode, int need);
diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index 48b343d03430..0a4085ced40f 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -16,6 +16,7 @@
#include <linux/mempool.h>
#include <linux/workqueue.h>
#include <linux/utsname.h>
+#include <linux/netfs.h>
#include "cifs_fs_sb.h"
#include "cifsacl.h"
#include <crypto/internal/hash.h>
@@ -1402,6 +1403,11 @@ void cifsFileInfo_put(struct cifsFileInfo *cifs_file);
*/

struct cifsInodeInfo {
+ struct {
+ /* These must be contiguous */
+ struct inode vfs_inode; /* the VFS's inode record */
+ struct netfs_i_context netfs_ctx; /* Netfslib context */
+ };
bool can_cache_brlcks;
struct list_head llist; /* locks helb by this inode */
/*
@@ -1432,10 +1438,6 @@ struct cifsInodeInfo {
u64 uniqueid; /* server inode number */
u64 createtime; /* creation time on server */
__u8 lease_key[SMB2_LEASE_KEY_SIZE]; /* lease key for this inode */
-#ifdef CONFIG_CIFS_FSCACHE
- struct fscache_cookie *fscache;
-#endif
- struct inode vfs_inode;
struct list_head deferred_closes; /* list of deferred closes */
spinlock_t deferred_lock; /* protection on deferred list */
bool lease_granted; /* Flag to indicate whether lease or oplock is granted. */
diff --git a/fs/cifs/fscache.c b/fs/cifs/fscache.c
index b47c2011ce5b..a638b29e9062 100644
--- a/fs/cifs/fscache.c
+++ b/fs/cifs/fscache.c
@@ -103,7 +103,7 @@ void cifs_fscache_get_inode_cookie(struct inode *inode)

cifs_fscache_fill_coherency(&cifsi->vfs_inode, &cd);

- cifsi->fscache =
+ cifsi->netfs_ctx.cache =
fscache_acquire_cookie(tcon->fscache, 0,
&cifsi->uniqueid, sizeof(cifsi->uniqueid),
&cd, sizeof(cd),
@@ -126,11 +126,12 @@ void cifs_fscache_unuse_inode_cookie(struct inode *inode, bool update)
void cifs_fscache_release_inode_cookie(struct inode *inode)
{
struct cifsInodeInfo *cifsi = CIFS_I(inode);
+ struct fscache_cookie *cookie = cifs_inode_cookie(inode);

- if (cifsi->fscache) {
- cifs_dbg(FYI, "%s: (0x%p)\n", __func__, cifsi->fscache);
- fscache_relinquish_cookie(cifsi->fscache, false);
- cifsi->fscache = NULL;
+ if (cookie) {
+ cifs_dbg(FYI, "%s: (0x%p)\n", __func__, cookie);
+ fscache_relinquish_cookie(cookie, false);
+ cifsi->netfs_ctx.cache = NULL;
}
}

diff --git a/fs/cifs/fscache.h b/fs/cifs/fscache.h
index 55129908e2c1..52355c0912ae 100644
--- a/fs/cifs/fscache.h
+++ b/fs/cifs/fscache.h
@@ -61,7 +61,7 @@ void cifs_fscache_fill_coherency(struct inode *inode,

static inline struct fscache_cookie *cifs_inode_cookie(struct inode *inode)
{
- return CIFS_I(inode)->fscache;
+ return netfs_i_cookie(inode);
}

static inline void cifs_invalidate_cache(struct inode *inode, unsigned int flags)
diff --git a/fs/netfs/internal.h b/fs/netfs/internal.h
index 89837e904fa7..5f9719409f21 100644
--- a/fs/netfs/internal.h
+++ b/fs/netfs/internal.h
@@ -6,6 +6,7 @@
*/

#include <linux/netfs.h>
+#include <linux/fscache.h>
#include <trace/events/netfs.h>

#ifdef pr_fmt
@@ -19,8 +20,6 @@
*/
struct netfs_io_request *netfs_alloc_request(struct address_space *mapping,
struct file *file,
- const struct netfs_request_ops *ops,
- void *netfs_priv,
loff_t start, size_t len,
enum netfs_io_origin origin);
void netfs_get_request(struct netfs_io_request *rreq, enum netfs_rreq_ref_trace what);
@@ -81,6 +80,20 @@ static inline void netfs_stat_d(atomic_t *stat)
#define netfs_stat_d(x) do {} while(0)
#endif

+/*
+ * Miscellaneous functions.
+ */
+static inline bool netfs_is_cache_enabled(struct netfs_i_context *ctx)
+{
+#if IS_ENABLED(CONFIG_FSCACHE)
+ struct fscache_cookie *cookie = ctx->cache;
+
+ return fscache_cookie_valid(cookie) && fscache_cookie_enabled(cookie);
+#else
+ return false;
+#endif
+}
+
/*****************************************************************************/
/*
* debug tracing
diff --git a/fs/netfs/objects.c b/fs/netfs/objects.c
index ae18827e156b..657b19e60118 100644
--- a/fs/netfs/objects.c
+++ b/fs/netfs/objects.c
@@ -13,12 +13,12 @@
*/
struct netfs_io_request *netfs_alloc_request(struct address_space *mapping,
struct file *file,
- const struct netfs_request_ops *ops,
- void *netfs_priv,
loff_t start, size_t len,
enum netfs_io_origin origin)
{
static atomic_t debug_ids;
+ struct inode *inode = file ? file_inode(file) : mapping->host;
+ struct netfs_i_context *ctx = netfs_i_context(inode);
struct netfs_io_request *rreq;
int ret;

@@ -29,11 +29,10 @@ struct netfs_io_request *netfs_alloc_request(struct address_space *mapping,
rreq->start = start;
rreq->len = len;
rreq->origin = origin;
- rreq->netfs_ops = ops;
- rreq->netfs_priv = netfs_priv;
+ rreq->netfs_ops = ctx->ops;
rreq->mapping = mapping;
- rreq->inode = file_inode(file);
- rreq->i_size = i_size_read(rreq->inode);
+ rreq->inode = inode;
+ rreq->i_size = i_size_read(inode);
rreq->debug_id = atomic_inc_return(&debug_ids);
INIT_LIST_HEAD(&rreq->subrequests);
INIT_WORK(&rreq->work, netfs_rreq_work);
@@ -76,6 +75,7 @@ static void netfs_free_request(struct work_struct *work)
{
struct netfs_io_request *rreq =
container_of(work, struct netfs_io_request, work);
+
netfs_clear_subrequests(rreq, false);
if (rreq->netfs_priv)
rreq->netfs_ops->cleanup(rreq->mapping, rreq->netfs_priv);
diff --git a/fs/netfs/read_helper.c b/fs/netfs/read_helper.c
index b5176f4320f4..73be06c409bb 100644
--- a/fs/netfs/read_helper.c
+++ b/fs/netfs/read_helper.c
@@ -14,7 +14,6 @@
#include <linux/uio.h>
#include <linux/sched/mm.h>
#include <linux/task_io_accounting_ops.h>
-#include <linux/netfs.h>
#include "internal.h"
#define CREATE_TRACE_POINTS
#include <trace/events/netfs.h>
@@ -735,8 +734,6 @@ static void netfs_rreq_expand(struct netfs_io_request *rreq,
/**
* netfs_readahead - Helper to manage a read request
* @ractl: The description of the readahead request
- * @ops: The network filesystem's operations for the helper to use
- * @netfs_priv: Private netfs data to be retained in the request
*
* Fulfil a readahead request by drawing data from the cache if possible, or
* the netfs if not. Space beyond the EOF is zero-filled. Multiple I/O
@@ -744,35 +741,32 @@ static void netfs_rreq_expand(struct netfs_io_request *rreq,
* readahead window can be expanded in either direction to a more convenient
* alighment for RPC efficiency or to make storage in the cache feasible.
*
- * The calling netfs must provide a table of operations, only one of which,
- * issue_op, is mandatory. It may also be passed a private token, which will
- * be retained in rreq->netfs_priv and will be cleaned up by ops->cleanup().
+ * The calling netfs must initialise a netfs context contiguous to the vfs
+ * inode before calling this.
*
* This is usable whether or not caching is enabled.
*/
-void netfs_readahead(struct readahead_control *ractl,
- const struct netfs_request_ops *ops,
- void *netfs_priv)
+void netfs_readahead(struct readahead_control *ractl)
{
struct netfs_io_request *rreq;
+ struct netfs_i_context *ctx = netfs_i_context(ractl->mapping->host);
unsigned int debug_index = 0;
int ret;

_enter("%lx,%x", readahead_index(ractl), readahead_count(ractl));

if (readahead_count(ractl) == 0)
- goto cleanup;
+ return;

rreq = netfs_alloc_request(ractl->mapping, ractl->file,
- ops, netfs_priv,
readahead_pos(ractl),
readahead_length(ractl),
NETFS_READAHEAD);
if (IS_ERR(rreq))
- goto cleanup;
+ return;

- if (ops->begin_cache_operation) {
- ret = ops->begin_cache_operation(rreq);
+ if (ctx->ops->begin_cache_operation) {
+ ret = ctx->ops->begin_cache_operation(rreq);
if (ret == -ENOMEM || ret == -EINTR || ret == -ERESTARTSYS)
goto cleanup_free;
}
@@ -804,42 +798,35 @@ void netfs_readahead(struct readahead_control *ractl,
cleanup_free:
netfs_put_request(rreq, false, netfs_rreq_trace_put_failed);
return;
-cleanup:
- if (netfs_priv)
- ops->cleanup(ractl->mapping, netfs_priv);
- return;
}
EXPORT_SYMBOL(netfs_readahead);

/**
* netfs_readpage - Helper to manage a readpage request
* @file: The file to read from
- * @folio: The folio to read
- * @ops: The network filesystem's operations for the helper to use
- * @netfs_priv: Private netfs data to be retained in the request
+ * @subpage: A subpage of the folio to read
*
* Fulfil a readpage request by drawing data from the cache if possible, or the
* netfs if not. Space beyond the EOF is zero-filled. Multiple I/O requests
* from different sources will get munged together.
*
- * The calling netfs must provide a table of operations, only one of which,
- * issue_op, is mandatory. It may also be passed a private token, which will
- * be retained in rreq->netfs_priv and will be cleaned up by ops->cleanup().
+ * The calling netfs must initialise a netfs context contiguous to the vfs
+ * inode before calling this.
*
* This is usable whether or not caching is enabled.
*/
-int netfs_readpage(struct file *file,
- struct folio *folio,
- const struct netfs_request_ops *ops,
- void *netfs_priv)
+int netfs_readpage(struct file *file, struct page *subpage)
{
+ struct folio *folio = page_folio(subpage);
+ struct address_space *mapping = folio->mapping;
struct netfs_io_request *rreq;
+ struct netfs_i_context *ctx = netfs_i_context(mapping->host);
unsigned int debug_index = 0;
int ret;

_enter("%lx", folio_index(folio));

- rreq = netfs_alloc_request(folio->mapping, file, ops, netfs_priv,
+ rreq = netfs_alloc_request(mapping, file,
folio_file_pos(folio), folio_size(folio),
NETFS_READPAGE);
if (IS_ERR(rreq)) {
@@ -847,8 +834,8 @@ int netfs_readpage(struct file *file,
goto alloc_error;
}

- if (ops->begin_cache_operation) {
- ret = ops->begin_cache_operation(rreq);
+ if (ctx->ops->begin_cache_operation) {
+ ret = ctx->ops->begin_cache_operation(rreq);
if (ret == -ENOMEM || ret == -EINTR || ret == -ERESTARTSYS) {
folio_unlock(folio);
goto out;
@@ -886,8 +873,6 @@ int netfs_readpage(struct file *file,
netfs_put_request(rreq, false, netfs_rreq_trace_put_hold);
return ret;
alloc_error:
- if (netfs_priv)
- ops->cleanup(folio_file_mapping(folio), netfs_priv);
folio_unlock(folio);
return ret;
}
@@ -898,6 +883,7 @@ EXPORT_SYMBOL(netfs_readpage);
* @folio: The folio being prepared
* @pos: starting position for the write
* @len: length of write
+ * @always_fill: T if the folio should always be completely filled/cleared
*
* In some cases, write_begin doesn't need to read at all:
* - full folio write
@@ -907,17 +893,27 @@ EXPORT_SYMBOL(netfs_readpage);
* If any of these criteria are met, then zero out the unwritten parts
* of the folio and return true. Otherwise, return false.
*/
-static bool netfs_skip_folio_read(struct folio *folio, loff_t pos, size_t len)
+static bool netfs_skip_folio_read(struct folio *folio, loff_t pos, size_t len,
+ bool always_fill)
{
struct inode *inode = folio_inode(folio);
loff_t i_size = i_size_read(inode);
size_t offset = offset_in_folio(folio, pos);
+ size_t plen = folio_size(folio);
+
+ if (unlikely(always_fill)) {
+ if (pos - offset + len <= i_size)
+ return false; /* Page entirely before EOF */
+ zero_user_segment(&folio->page, 0, plen);
+ folio_mark_uptodate(folio);
+ return true;
+ }

/* Full folio write */
- if (offset == 0 && len >= folio_size(folio))
+ if (offset == 0 && len >= plen)
return true;

- /* pos beyond last folio in the file */
+ /* Page entirely beyond the end of the file */
if (pos - offset >= i_size)
goto zero_out;

@@ -927,7 +923,7 @@ static bool netfs_skip_folio_read(struct folio *folio, loff_t pos, size_t len)

return false;
zero_out:
- zero_user_segments(&folio->page, 0, offset, offset + len, folio_size(folio));
+ zero_user_segments(&folio->page, 0, offset, offset + len, len);
return true;
}

@@ -940,8 +936,6 @@ static bool netfs_skip_folio_read(struct folio *folio, loff_t pos, size_t len)
* @aop_flags: AOP_* flags
* @_folio: Where to put the resultant folio
* @_fsdata: Place for the netfs to store a cookie
- * @ops: The network filesystem's operations for the helper to use
- * @netfs_priv: Private netfs data to be retained in the request
*
* Pre-read data for a write-begin request by drawing data from the cache if
* possible, or the netfs if not. Space beyond the EOF is zero-filled.
@@ -960,17 +954,18 @@ static bool netfs_skip_folio_read(struct folio *folio, loff_t pos, size_t len)
* should go ahead; unlock the folio and return -EAGAIN to cause the folio to
* be regot; or return an error.
*
+ * The calling netfs must initialise a netfs context contiguous to the vfs
+ * inode before calling this.
+ *
* This is usable whether or not caching is enabled.
*/
int netfs_write_begin(struct file *file, struct address_space *mapping,
loff_t pos, unsigned int len, unsigned int aop_flags,
- struct folio **_folio, void **_fsdata,
- const struct netfs_request_ops *ops,
- void *netfs_priv)
+ struct folio **_folio, void **_fsdata)
{
struct netfs_io_request *rreq;
+ struct netfs_i_context *ctx = netfs_i_context(file_inode(file ));
struct folio *folio;
- struct inode *inode = file_inode(file);
unsigned int debug_index = 0, fgp_flags;
pgoff_t index = pos >> PAGE_SHIFT;
int ret;
@@ -986,9 +981,9 @@ int netfs_write_begin(struct file *file, struct address_space *mapping,
if (!folio)
return -ENOMEM;

- if (ops->check_write_begin) {
+ if (ctx->ops->check_write_begin) {
/* Allow the netfs (eg. ceph) to flush conflicts. */
- ret = ops->check_write_begin(file, pos, len, folio, _fsdata);
+ ret = ctx->ops->check_write_begin(file, pos, len, folio, _fsdata);
if (ret < 0) {
trace_netfs_failure(NULL, NULL, ret, netfs_fail_check_write_begin);
if (ret == -EAGAIN)
@@ -1004,13 +999,13 @@ int netfs_write_begin(struct file *file, struct address_space *mapping,
* within the cache granule containing the EOF, in which case we need
* to preload the granule.
*/
- if (!ops->is_cache_enabled(inode) &&
- netfs_skip_folio_read(folio, pos, len)) {
+ if (!netfs_is_cache_enabled(ctx) &&
+ netfs_skip_folio_read(folio, pos, len, false)) {
netfs_stat(&netfs_n_rh_write_zskip);
goto have_folio_no_wait;
}

- rreq = netfs_alloc_request(mapping, file, ops, netfs_priv,
+ rreq = netfs_alloc_request(mapping, file,
folio_file_pos(folio), folio_size(folio),
NETFS_READ_FOR_WRITE);
if (IS_ERR(rreq)) {
@@ -1019,10 +1014,9 @@ int netfs_write_begin(struct file *file, struct address_space *mapping,
}
rreq->no_unlock_folio = folio_index(folio);
__set_bit(NETFS_RREQ_NO_UNLOCK_FOLIO, &rreq->flags);
- netfs_priv = NULL;

- if (ops->begin_cache_operation) {
- ret = ops->begin_cache_operation(rreq);
+ if (ctx->ops->begin_cache_operation) {
+ ret = ctx->ops->begin_cache_operation(rreq);
if (ret == -ENOMEM || ret == -EINTR || ret == -ERESTARTSYS)
goto error_put;
}
@@ -1076,8 +1070,6 @@ int netfs_write_begin(struct file *file, struct address_space *mapping,
if (ret < 0)
goto error;
have_folio_no_wait:
- if (netfs_priv)
- ops->cleanup(mapping, netfs_priv);
*_folio = folio;
_leave(" = 0");
return 0;
@@ -1087,8 +1079,6 @@ int netfs_write_begin(struct file *file, struct address_space *mapping,
error:
folio_unlock(folio);
folio_put(folio);
- if (netfs_priv)
- ops->cleanup(mapping, netfs_priv);
_leave(" = %d", ret);
return ret;
}
diff --git a/fs/netfs/stats.c b/fs/netfs/stats.c
index 9ae538c85378..5510a7a14a40 100644
--- a/fs/netfs/stats.c
+++ b/fs/netfs/stats.c
@@ -7,7 +7,6 @@

#include <linux/export.h>
#include <linux/seq_file.h>
-#include <linux/netfs.h>
#include "internal.h"

atomic_t netfs_n_rh_readahead;
diff --git a/include/linux/netfs.h b/include/linux/netfs.h
index 4b99e38f73d9..8458b30172a5 100644
--- a/include/linux/netfs.h
+++ b/include/linux/netfs.h
@@ -118,6 +118,16 @@ enum netfs_io_source {
typedef void (*netfs_io_terminated_t)(void *priv, ssize_t transferred_or_error,
bool was_async);

+/*
+ * Per-inode description. This must be directly after the inode struct.
+ */
+struct netfs_i_context {
+ const struct netfs_request_ops *ops;
+#if IS_ENABLED(CONFIG_FSCACHE)
+ struct fscache_cookie *cache;
+#endif
+};
+
/*
* Resources required to do operations on a cache.
*/
@@ -192,7 +202,6 @@ struct netfs_io_request {
* Operations the network filesystem can/must provide to the helpers.
*/
struct netfs_request_ops {
- bool (*is_cache_enabled)(struct inode *inode);
int (*init_request)(struct netfs_io_request *rreq, struct file *file);
int (*begin_cache_operation)(struct netfs_io_request *rreq);
void (*expand_readahead)(struct netfs_io_request *rreq);
@@ -263,18 +272,11 @@ struct netfs_cache_ops {
};

struct readahead_control;
-extern void netfs_readahead(struct readahead_control *,
- const struct netfs_request_ops *,
- void *);
-extern int netfs_readpage(struct file *,
- struct folio *,
- const struct netfs_request_ops *,
- void *);
+extern void netfs_readahead(struct readahead_control *);
+extern int netfs_readpage(struct file *, struct page *);
extern int netfs_write_begin(struct file *, struct address_space *,
loff_t, unsigned int, unsigned int, struct folio **,
- void **,
- const struct netfs_request_ops *,
- void *);
+ void **);

extern void netfs_subreq_terminated(struct netfs_io_subrequest *, ssize_t, bool);
extern void netfs_get_subrequest(struct netfs_io_subrequest *subreq,
@@ -283,4 +285,61 @@ extern void netfs_put_subrequest(struct netfs_io_subrequest *subreq,
bool was_async, enum netfs_sreq_ref_trace what);
extern void netfs_stats_show(struct seq_file *);

+/**
+ * netfs_i_context - Get the netfs inode context from the inode
+ * @inode: The inode to query
+ *
+ * Get the netfs lib inode context from the network filesystem's inode. The
+ * context struct is expected to directly follow on from the VFS inode struct.
+ */
+static inline struct netfs_i_context *netfs_i_context(struct inode *inode)
+{
+ return (struct netfs_i_context *)(inode + 1);
+}
+
+/**
+ * netfs_inode - Get the netfs inode from the inode context
+ * @ctx: The context to query
+ *
+ * Get the netfs inode from the netfs library's inode context. The VFS inode
+ * is expected to directly precede the context struct.
+ */
+static inline struct inode *netfs_inode(struct netfs_i_context *ctx)
+{
+ return ((struct inode *)ctx) - 1;
+}
+
+/**
+ * netfs_i_context_init - Initialise a netfs lib context
+ * @inode: The inode with which the context is associated
+ * @ops: The netfs's operations list
+ *
+ * Initialise the netfs library context struct. This is expected to follow on
+ * directly from the VFS inode struct.
+ */
+static inline void netfs_i_context_init(struct inode *inode,
+ const struct netfs_request_ops *ops)
+{
+ struct netfs_i_context *ctx = netfs_i_context(inode);
+
+ memset(ctx, 0, sizeof(*ctx));
+ ctx->ops = ops;
+}
+
+/**
+ * netfs_i_cookie - Get the cache cookie from the inode
+ * @inode: The inode to query
+ *
+ * Get the caching cookie (if enabled) from the network filesystem's inode.
+ */
+static inline struct fscache_cookie *netfs_i_cookie(struct inode *inode)
+{
+#if IS_ENABLED(CONFIG_FSCACHE)
+ struct netfs_i_context *ctx = netfs_i_context(inode);
+ return ctx->cache;
+#else
+ return NULL;
+#endif
+}
+
#endif /* _LINUX_NETFS_H */

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