[PATCH v9 2/5] NFS: Configure support for netfs when NFS fscache is configured

Dave Wysochanski
2022-10-17T10:52:32Z

As first steps for support of the netfs library when NFS_FSCACHE is
configured, add NETFS_SUPPORT to Kconfig and add the required netfs_inode
into struct nfs_inode.

Using netfs requires we move the VFS inode structure to be stored
inside struct netfs_inode, along with the fscache_cookie.
Thus, create a new helper, VFS_I(), which is defined
differently depending on whether NFS_FSCACHE is configured.
In addition, use the netfs_inode() and netfs_i_cookie() helpers,
and remove our own helper, nfs_i_fscache().

Later patches will convert NFS fscache to fully use netfs.

Signed-off-by: Dave Wysochanski <dwysocha@redhat.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
---
fs/nfs/Kconfig | 1 +
fs/nfs/delegation.c | 2 +-
fs/nfs/dir.c | 2 +-
fs/nfs/fscache.c | 20 +++++++++-----------
fs/nfs/fscache.h | 15 ++++++---------
fs/nfs/inode.c | 6 +++---
fs/nfs/internal.h | 2 +-
fs/nfs/pnfs.c | 12 ++++++------
fs/nfs/write.c | 2 +-
include/linux/nfs_fs.h | 34 +++++++++++++++++++++++-----------
10 files changed, 52 insertions(+), 44 deletions(-)

diff --git a/fs/nfs/Kconfig b/fs/nfs/Kconfig
index 14a72224b657..8fbb6caf3481 100644
--- a/fs/nfs/Kconfig
+++ b/fs/nfs/Kconfig
@@ -171,6 +171,7 @@ config ROOT_NFS
config NFS_FSCACHE
bool "Provide NFS client caching support"
depends on NFS_FS=m && FSCACHE || NFS_FS=y && FSCACHE=y
+ select NETFS_SUPPORT
help
Say Y here if you want NFS data to be cached locally on disc through
the general filesystem cache manager
diff --git a/fs/nfs/delegation.c b/fs/nfs/delegation.c
index 5c97cad741a7..b5c492d40367 100644
--- a/fs/nfs/delegation.c
+++ b/fs/nfs/delegation.c
@@ -306,7 +306,7 @@ nfs_start_delegation_return_locked(struct nfs_inode *nfsi)
}
spin_unlock(&delegation->lock);
if (ret)
- nfs_clear_verifier_delegated(&nfsi->vfs_inode);
+ nfs_clear_verifier_delegated(VFS_I(nfsi));
out:
return ret;
}
diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index 5d6c2ddc7ea6..b63c624cea6d 100644
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -2799,7 +2799,7 @@ nfs_do_access_cache_scan(unsigned int nr_to_scan)

if (nr_to_scan-- == 0)
break;
- inode = &nfsi->vfs_inode;
+ inode = VFS_I(nfsi);
spin_lock(&inode->i_lock);
if (list_empty(&nfsi->access_cache_entry_lru))
goto remove_lru_entry;
diff --git a/fs/nfs/fscache.c b/fs/nfs/fscache.c
index e861d7bae305..a6fc1c8b6644 100644
--- a/fs/nfs/fscache.c
+++ b/fs/nfs/fscache.c
@@ -163,13 +163,14 @@ void nfs_fscache_init_inode(struct inode *inode)
struct nfs_server *nfss = NFS_SERVER(inode);
struct nfs_inode *nfsi = NFS_I(inode);

- nfsi->fscache = NULL;
+ netfs_inode(inode)->cache = NULL;
if (!(nfss->fscache && S_ISREG(inode->i_mode)))
return;

nfs_fscache_update_auxdata(&auxdata, inode);

- nfsi->fscache = fscache_acquire_cookie(NFS_SB(inode->i_sb)->fscache,
+ netfs_inode(inode)->cache = fscache_acquire_cookie(
+ nfss->fscache,
0,
nfsi->fh.data, /* index_key */
nfsi->fh.size,
@@ -183,11 +184,8 @@ void nfs_fscache_init_inode(struct inode *inode)
*/
void nfs_fscache_clear_inode(struct inode *inode)
{
- struct nfs_inode *nfsi = NFS_I(inode);
- struct fscache_cookie *cookie = nfs_i_fscache(inode);
-
- fscache_relinquish_cookie(cookie, false);
- nfsi->fscache = NULL;
+ fscache_relinquish_cookie(netfs_i_cookie(&NFS_I(inode)->netfs), false);
+ netfs_inode(inode)->cache = NULL;
}

/*
@@ -212,7 +210,7 @@ void nfs_fscache_clear_inode(struct inode *inode)
void nfs_fscache_open_file(struct inode *inode, struct file *filp)
{
struct nfs_fscache_inode_auxdata auxdata;
- struct fscache_cookie *cookie = nfs_i_fscache(inode);
+ struct fscache_cookie *cookie = netfs_i_cookie(&NFS_I(inode)->netfs);
bool open_for_write = inode_is_open_for_write(inode);

if (!fscache_cookie_valid(cookie))
@@ -230,7 +228,7 @@ EXPORT_SYMBOL_GPL(nfs_fscache_open_file);
void nfs_fscache_release_file(struct inode *inode, struct file *filp)
{
struct nfs_fscache_inode_auxdata auxdata;
- struct fscache_cookie *cookie = nfs_i_fscache(inode);
+ struct fscache_cookie *cookie = netfs_i_cookie(&NFS_I(inode)->netfs);
loff_t i_size = i_size_read(inode);

nfs_fscache_update_auxdata(&auxdata, inode);
@@ -243,7 +241,7 @@ void nfs_fscache_release_file(struct inode *inode, struct file *filp)
static int fscache_fallback_read_page(struct inode *inode, struct page *page)
{
struct netfs_cache_resources cres;
- struct fscache_cookie *cookie = nfs_i_fscache(inode);
+ struct fscache_cookie *cookie = netfs_i_cookie(&NFS_I(inode)->netfs);
struct iov_iter iter;
struct bio_vec bvec[1];
int ret;
@@ -271,7 +269,7 @@ static int fscache_fallback_write_page(struct inode *inode, struct page *page,
bool no_space_allocated_yet)
{
struct netfs_cache_resources cres;
- struct fscache_cookie *cookie = nfs_i_fscache(inode);
+ struct fscache_cookie *cookie = netfs_i_cookie(&NFS_I(inode)->netfs);
struct iov_iter iter;
struct bio_vec bvec[1];
loff_t start = page_offset(page);
diff --git a/fs/nfs/fscache.h b/fs/nfs/fscache.h
index 2a37af880978..38614ed8f951 100644
--- a/fs/nfs/fscache.h
+++ b/fs/nfs/fscache.h
@@ -54,7 +54,7 @@ static inline bool nfs_fscache_release_folio(struct folio *folio, gfp_t gfp)
if (current_is_kswapd() || !(gfp & __GFP_FS))
return false;
folio_wait_fscache(folio);
- fscache_note_page_release(nfs_i_fscache(folio->mapping->host));
+ fscache_note_page_release(netfs_i_cookie(&NFS_I(folio->mapping->host)->netfs));
nfs_inc_fscache_stats(folio->mapping->host,
NFSIOS_FSCACHE_PAGES_UNCACHED);
}
@@ -66,7 +66,7 @@ static inline bool nfs_fscache_release_folio(struct folio *folio, gfp_t gfp)
*/
static inline int nfs_fscache_read_page(struct inode *inode, struct page *page)
{
- if (nfs_i_fscache(inode))
+ if (netfs_inode(inode)->cache)
return __nfs_fscache_read_page(inode, page);
return -ENOBUFS;
}
@@ -78,7 +78,7 @@ static inline int nfs_fscache_read_page(struct inode *inode, struct page *page)
static inline void nfs_fscache_write_page(struct inode *inode,
struct page *page)
{
- if (nfs_i_fscache(inode))
+ if (netfs_inode(inode)->cache)
__nfs_fscache_write_page(inode, page);
}

@@ -101,13 +101,10 @@ static inline void nfs_fscache_update_auxdata(struct nfs_fscache_inode_auxdata *
static inline void nfs_fscache_invalidate(struct inode *inode, int flags)
{
struct nfs_fscache_inode_auxdata auxdata;
- struct nfs_inode *nfsi = NFS_I(inode);
+ struct fscache_cookie *cookie = netfs_i_cookie(&NFS_I(inode)->netfs);

- if (nfsi->fscache) {
- nfs_fscache_update_auxdata(&auxdata, inode);
- fscache_invalidate(nfsi->fscache, &auxdata,
- i_size_read(inode), flags);
- }
+ nfs_fscache_update_auxdata(&auxdata, inode);
+ fscache_invalidate(cookie, &auxdata, i_size_read(inode), flags);
}

/*
diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
index bea7c005119c..aa2aec785ab5 100644
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -1411,7 +1411,7 @@ int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping)

static bool nfs_file_has_writers(struct nfs_inode *nfsi)
{
- struct inode *inode = &nfsi->vfs_inode;
+ struct inode *inode = VFS_I(nfsi);

if (!S_ISREG(inode->i_mode))
return false;
@@ -2249,7 +2249,7 @@ struct inode *nfs_alloc_inode(struct super_block *sb)
#ifdef CONFIG_NFS_V4_2
nfsi->xattr_cache = NULL;
#endif
- return &nfsi->vfs_inode;
+ return VFS_I(nfsi);
}
EXPORT_SYMBOL_GPL(nfs_alloc_inode);

@@ -2273,7 +2273,7 @@ static void init_once(void *foo)
{
struct nfs_inode *nfsi = (struct nfs_inode *) foo;

- inode_init_once(&nfsi->vfs_inode);
+ inode_init_once(VFS_I(nfsi));
INIT_LIST_HEAD(&nfsi->open_files);
INIT_LIST_HEAD(&nfsi->access_cache_entry_lru);
INIT_LIST_HEAD(&nfsi->access_cache_inode_lru);
diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h
index 898dd95bc7a7..4d240ac4430f 100644
--- a/fs/nfs/internal.h
+++ b/fs/nfs/internal.h
@@ -355,7 +355,7 @@ nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src)

static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi)
{
- if (nfs_server_capable(&nfsi->vfs_inode, NFS_CAP_SECURITY_LABEL))
+ if (nfs_server_capable(VFS_I(nfsi), NFS_CAP_SECURITY_LABEL))
nfsi->cache_validity |= NFS_INO_INVALID_LABEL;
}
#else
diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c
index 2613b7e36eb9..035bf2eac2cf 100644
--- a/fs/nfs/pnfs.c
+++ b/fs/nfs/pnfs.c
@@ -763,19 +763,19 @@ static struct pnfs_layout_hdr *__pnfs_destroy_layout(struct nfs_inode *nfsi)
struct pnfs_layout_hdr *lo;
LIST_HEAD(tmp_list);

- spin_lock(&nfsi->vfs_inode.i_lock);
+ spin_lock(&VFS_I(nfsi)->i_lock);
lo = nfsi->layout;
if (lo) {
pnfs_get_layout_hdr(lo);
pnfs_mark_layout_stateid_invalid(lo, &tmp_list);
pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RO_FAILED);
pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RW_FAILED);
- spin_unlock(&nfsi->vfs_inode.i_lock);
+ spin_unlock(&VFS_I(nfsi)->i_lock);
pnfs_free_lseg_list(&tmp_list);
- nfs_commit_inode(&nfsi->vfs_inode, 0);
+ nfs_commit_inode(VFS_I(nfsi), 0);
pnfs_put_layout_hdr(lo);
} else
- spin_unlock(&nfsi->vfs_inode.i_lock);
+ spin_unlock(&VFS_I(nfsi)->i_lock);
return lo;
}

@@ -790,9 +790,9 @@ static bool pnfs_layout_removed(struct nfs_inode *nfsi,
{
bool ret;

- spin_lock(&nfsi->vfs_inode.i_lock);
+ spin_lock(&VFS_I(nfsi)->i_lock);
ret = nfsi->layout != lo;
- spin_unlock(&nfsi->vfs_inode.i_lock);
+ spin_unlock(&VFS_I(nfsi)->i_lock);
return ret;
}

diff --git a/fs/nfs/write.c b/fs/nfs/write.c
index f41d24b54fd1..911569022036 100644
--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -828,7 +828,7 @@ nfs_page_search_commits_for_head_request_locked(struct nfs_inode *nfsi,
{
struct nfs_page *freq, *t;
struct nfs_commit_info cinfo;
- struct inode *inode = &nfsi->vfs_inode;
+ struct inode *inode = VFS_I(nfsi);

nfs_init_cinfo_from_inode(&cinfo, inode);

diff --git a/include/linux/nfs_fs.h b/include/linux/nfs_fs.h
index 7931fa472561..a1c402e26abf 100644
--- a/include/linux/nfs_fs.h
+++ b/include/linux/nfs_fs.h
@@ -31,6 +31,10 @@
#include <linux/sunrpc/auth.h>
#include <linux/sunrpc/clnt.h>

+#ifdef CONFIG_NFS_FSCACHE
+#include <linux/netfs.h>
+#endif
+
#include <linux/nfs.h>
#include <linux/nfs2.h>
#include <linux/nfs3.h>
@@ -204,9 +208,11 @@ struct nfs_inode {
__u64 write_io;
__u64 read_io;
#ifdef CONFIG_NFS_FSCACHE
- struct fscache_cookie *fscache;
-#endif
+ struct netfs_inode netfs; /* netfs context and VFS inode */
+#else
struct inode vfs_inode;
+#endif
+

#ifdef CONFIG_NFS_V4_2
struct nfs4_xattr_cache *xattr_cache;
@@ -281,10 +287,25 @@ struct nfs4_copy_state {
#define NFS_INO_LAYOUTSTATS (11) /* layoutstats inflight */
#define NFS_INO_ODIRECT (12) /* I/O setting is O_DIRECT */

+#ifdef CONFIG_NFS_FSCACHE
+static inline struct inode *VFS_I(struct nfs_inode *nfsi)
+{
+ return &nfsi->netfs.inode;
+}
+static inline struct nfs_inode *NFS_I(const struct inode *inode)
+{
+ return container_of(inode, struct nfs_inode, netfs.inode);
+}
+#else
+static inline struct inode *VFS_I(struct nfs_inode *nfsi)
+{
+ return &nfsi->vfs_inode;
+}
static inline struct nfs_inode *NFS_I(const struct inode *inode)
{
return container_of(inode, struct nfs_inode, vfs_inode);
}
+#endif

static inline struct nfs_server *NFS_SB(const struct super_block *s)
{
@@ -328,15 +349,6 @@ static inline int NFS_STALE(const struct inode *inode)
return test_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
}

-static inline struct fscache_cookie *nfs_i_fscache(struct inode *inode)
-{
-#ifdef CONFIG_NFS_FSCACHE
- return NFS_I(inode)->fscache;
-#else
- return NULL;
-#endif
-}
-
static inline __u64 NFS_FILEID(const struct inode *inode)
{
return NFS_I(inode)->fileid;
--
2.31.1