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-rw-r--r--fs/nfs/fscache-index.c34
-rw-r--r--fs/nfs/fscache.c116
-rw-r--r--fs/nfs/fscache.h49
-rw-r--r--fs/nfs/internal.h3
-rw-r--r--fs/nfs/super.c9
-rw-r--r--include/linux/nfs_fs_sb.h5
6 files changed, 214 insertions, 2 deletions
diff --git a/fs/nfs/fscache-index.c b/fs/nfs/fscache-index.c
index ff14b032459b..a824050be807 100644
--- a/fs/nfs/fscache-index.c
+++ b/fs/nfs/fscache-index.c
@@ -112,3 +112,37 @@ const struct fscache_cookie_def nfs_fscache_server_index_def = {
.type = FSCACHE_COOKIE_TYPE_INDEX,
.get_key = nfs_server_get_key,
};
+
+/*
+ * Generate a key to describe a superblock key in the main NFS index
+ */
+static uint16_t nfs_super_get_key(const void *cookie_netfs_data,
+ void *buffer, uint16_t bufmax)
+{
+ const struct nfs_fscache_key *key;
+ const struct nfs_server *nfss = cookie_netfs_data;
+ uint16_t len;
+
+ key = nfss->fscache_key;
+ len = sizeof(key->key) + key->key.uniq_len;
+ if (len > bufmax) {
+ len = 0;
+ } else {
+ memcpy(buffer, &key->key, sizeof(key->key));
+ memcpy(buffer + sizeof(key->key),
+ key->key.uniquifier, key->key.uniq_len);
+ }
+
+ return len;
+}
+
+/*
+ * Define the superblock object for FS-Cache. This is used to describe a
+ * superblock object to fscache_acquire_cookie(). It is keyed by all the NFS
+ * parameters that might cause a separate superblock.
+ */
+const struct fscache_cookie_def nfs_fscache_super_index_def = {
+ .name = "NFS.super",
+ .type = FSCACHE_COOKIE_TYPE_INDEX,
+ .get_key = nfs_super_get_key,
+};
diff --git a/fs/nfs/fscache.c b/fs/nfs/fscache.c
index c3f056f89477..ab2de2c92b21 100644
--- a/fs/nfs/fscache.c
+++ b/fs/nfs/fscache.c
@@ -23,6 +23,9 @@
#define NFSDBG_FACILITY NFSDBG_FSCACHE
+static struct rb_root nfs_fscache_keys = RB_ROOT;
+static DEFINE_SPINLOCK(nfs_fscache_keys_lock);
+
/*
* Get the per-client index cookie for an NFS client if the appropriate mount
* flag was set
@@ -50,3 +53,116 @@ void nfs_fscache_release_client_cookie(struct nfs_client *clp)
fscache_relinquish_cookie(clp->fscache, 0);
clp->fscache = NULL;
}
+
+/*
+ * Get the cache cookie for an NFS superblock. We have to handle
+ * uniquification here because the cache doesn't do it for us.
+ */
+void nfs_fscache_get_super_cookie(struct super_block *sb,
+ struct nfs_parsed_mount_data *data)
+{
+ struct nfs_fscache_key *key, *xkey;
+ struct nfs_server *nfss = NFS_SB(sb);
+ struct rb_node **p, *parent;
+ const char *uniq = data->fscache_uniq ?: "";
+ int diff, ulen;
+
+ ulen = strlen(uniq);
+ key = kzalloc(sizeof(*key) + ulen, GFP_KERNEL);
+ if (!key)
+ return;
+
+ key->nfs_client = nfss->nfs_client;
+ key->key.super.s_flags = sb->s_flags & NFS_MS_MASK;
+ key->key.nfs_server.flags = nfss->flags;
+ key->key.nfs_server.rsize = nfss->rsize;
+ key->key.nfs_server.wsize = nfss->wsize;
+ key->key.nfs_server.acregmin = nfss->acregmin;
+ key->key.nfs_server.acregmax = nfss->acregmax;
+ key->key.nfs_server.acdirmin = nfss->acdirmin;
+ key->key.nfs_server.acdirmax = nfss->acdirmax;
+ key->key.nfs_server.fsid = nfss->fsid;
+ key->key.rpc_auth.au_flavor = nfss->client->cl_auth->au_flavor;
+
+ key->key.uniq_len = ulen;
+ memcpy(key->key.uniquifier, uniq, ulen);
+
+ spin_lock(&nfs_fscache_keys_lock);
+ p = &nfs_fscache_keys.rb_node;
+ parent = NULL;
+ while (*p) {
+ parent = *p;
+ xkey = rb_entry(parent, struct nfs_fscache_key, node);
+
+ if (key->nfs_client < xkey->nfs_client)
+ goto go_left;
+ if (key->nfs_client > xkey->nfs_client)
+ goto go_right;
+
+ diff = memcmp(&key->key, &xkey->key, sizeof(key->key));
+ if (diff < 0)
+ goto go_left;
+ if (diff > 0)
+ goto go_right;
+
+ if (key->key.uniq_len == 0)
+ goto non_unique;
+ diff = memcmp(key->key.uniquifier,
+ xkey->key.uniquifier,
+ key->key.uniq_len);
+ if (diff < 0)
+ goto go_left;
+ if (diff > 0)
+ goto go_right;
+ goto non_unique;
+
+ go_left:
+ p = &(*p)->rb_left;
+ continue;
+ go_right:
+ p = &(*p)->rb_right;
+ }
+
+ rb_link_node(&key->node, parent, p);
+ rb_insert_color(&key->node, &nfs_fscache_keys);
+ spin_unlock(&nfs_fscache_keys_lock);
+ nfss->fscache_key = key;
+
+ /* create a cache index for looking up filehandles */
+ nfss->fscache = fscache_acquire_cookie(nfss->nfs_client->fscache,
+ &nfs_fscache_super_index_def,
+ nfss);
+ dfprintk(FSCACHE, "NFS: get superblock cookie (0x%p/0x%p)\n",
+ nfss, nfss->fscache);
+ return;
+
+non_unique:
+ spin_unlock(&nfs_fscache_keys_lock);
+ kfree(key);
+ nfss->fscache_key = NULL;
+ nfss->fscache = NULL;
+ printk(KERN_WARNING "NFS:"
+ " Cache request denied due to non-unique superblock keys\n");
+}
+
+/*
+ * release a per-superblock cookie
+ */
+void nfs_fscache_release_super_cookie(struct super_block *sb)
+{
+ struct nfs_server *nfss = NFS_SB(sb);
+
+ dfprintk(FSCACHE, "NFS: releasing superblock cookie (0x%p/0x%p)\n",
+ nfss, nfss->fscache);
+
+ fscache_relinquish_cookie(nfss->fscache, 0);
+ nfss->fscache = NULL;
+
+ if (nfss->fscache_key) {
+ spin_lock(&nfs_fscache_keys_lock);
+ rb_erase(&nfss->fscache_key->node, &nfs_fscache_keys);
+ spin_unlock(&nfs_fscache_keys_lock);
+ kfree(nfss->fscache_key);
+ nfss->fscache_key = NULL;
+ }
+}
diff --git a/fs/nfs/fscache.h b/fs/nfs/fscache.h
index 1d864bedf154..22b971e8b380 100644
--- a/fs/nfs/fscache.h
+++ b/fs/nfs/fscache.h
@@ -20,10 +20,48 @@
#ifdef CONFIG_NFS_FSCACHE
/*
+ * set of NFS FS-Cache objects that form a superblock key
+ */
+struct nfs_fscache_key {
+ struct rb_node node;
+ struct nfs_client *nfs_client; /* the server */
+
+ /* the elements of the unique key - as used by nfs_compare_super() and
+ * nfs_compare_mount_options() to distinguish superblocks */
+ struct {
+ struct {
+ unsigned long s_flags; /* various flags
+ * (& NFS_MS_MASK) */
+ } super;
+
+ struct {
+ struct nfs_fsid fsid;
+ int flags;
+ unsigned int rsize; /* read size */
+ unsigned int wsize; /* write size */
+ unsigned int acregmin; /* attr cache timeouts */
+ unsigned int acregmax;
+ unsigned int acdirmin;
+ unsigned int acdirmax;
+ } nfs_server;
+
+ struct {
+ rpc_authflavor_t au_flavor;
+ } rpc_auth;
+
+ /* uniquifier - can be used if nfs_server.flags includes
+ * NFS_MOUNT_UNSHARED */
+ u8 uniq_len;
+ char uniquifier[0];
+ } key;
+};
+
+/*
* fscache-index.c
*/
extern struct fscache_netfs nfs_fscache_netfs;
extern const struct fscache_cookie_def nfs_fscache_server_index_def;
+extern const struct fscache_cookie_def nfs_fscache_super_index_def;
extern int nfs_fscache_register(void);
extern void nfs_fscache_unregister(void);
@@ -34,6 +72,10 @@ extern void nfs_fscache_unregister(void);
extern void nfs_fscache_get_client_cookie(struct nfs_client *);
extern void nfs_fscache_release_client_cookie(struct nfs_client *);
+extern void nfs_fscache_get_super_cookie(struct super_block *,
+ struct nfs_parsed_mount_data *);
+extern void nfs_fscache_release_super_cookie(struct super_block *);
+
#else /* CONFIG_NFS_FSCACHE */
static inline int nfs_fscache_register(void) { return 0; }
static inline void nfs_fscache_unregister(void) {}
@@ -41,5 +83,12 @@ static inline void nfs_fscache_unregister(void) {}
static inline void nfs_fscache_get_client_cookie(struct nfs_client *clp) {}
static inline void nfs_fscache_release_client_cookie(struct nfs_client *clp) {}
+static inline void nfs_fscache_get_super_cookie(
+ struct super_block *sb,
+ struct nfs_parsed_mount_data *data)
+{
+}
+static inline void nfs_fscache_release_super_cookie(struct super_block *sb) {}
+
#endif /* CONFIG_NFS_FSCACHE */
#endif /* _NFS_FSCACHE_H */
diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h
index 2041f68ff1cc..013070000c38 100644
--- a/fs/nfs/internal.h
+++ b/fs/nfs/internal.h
@@ -5,6 +5,8 @@
#include <linux/mount.h>
#include <linux/security.h>
+#define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS)
+
struct nfs_string;
/* Maximum number of readahead requests
@@ -41,6 +43,7 @@ struct nfs_parsed_mount_data {
unsigned int auth_flavor_len;
rpc_authflavor_t auth_flavors[1];
char *client_address;
+ char *fscache_uniq;
struct {
struct sockaddr_storage address;
diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index 0942fcbbad3c..87f65ae07f32 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -60,6 +60,7 @@
#include "delegation.h"
#include "iostat.h"
#include "internal.h"
+#include "fscache.h"
#define NFSDBG_FACILITY NFSDBG_VFS
@@ -1870,8 +1871,6 @@ static void nfs_clone_super(struct super_block *sb,
nfs_initialise_sb(sb);
}
-#define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS)
-
static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
{
const struct nfs_server *a = s->s_fs_info;
@@ -2036,6 +2035,7 @@ static int nfs_get_sb(struct file_system_type *fs_type,
if (!s->s_root) {
/* initial superblock/root creation */
nfs_fill_super(s, data);
+ nfs_fscache_get_super_cookie(s, data);
}
mntroot = nfs_get_root(s, mntfh);
@@ -2056,6 +2056,7 @@ static int nfs_get_sb(struct file_system_type *fs_type,
out:
kfree(data->nfs_server.hostname);
kfree(data->mount_server.hostname);
+ kfree(data->fscache_uniq);
security_free_mnt_opts(&data->lsm_opts);
out_free_fh:
kfree(mntfh);
@@ -2083,6 +2084,7 @@ static void nfs_kill_super(struct super_block *s)
bdi_unregister(&server->backing_dev_info);
kill_anon_super(s);
+ nfs_fscache_release_super_cookie(s);
nfs_free_server(server);
}
@@ -2390,6 +2392,7 @@ static int nfs4_get_sb(struct file_system_type *fs_type,
if (!s->s_root) {
/* initial superblock/root creation */
nfs4_fill_super(s);
+ nfs_fscache_get_super_cookie(s, data);
}
mntroot = nfs4_get_root(s, mntfh);
@@ -2411,6 +2414,7 @@ out:
kfree(data->client_address);
kfree(data->nfs_server.export_path);
kfree(data->nfs_server.hostname);
+ kfree(data->fscache_uniq);
security_free_mnt_opts(&data->lsm_opts);
out_free_fh:
kfree(mntfh);
@@ -2437,6 +2441,7 @@ static void nfs4_kill_super(struct super_block *sb)
kill_anon_super(sb);
nfs4_renewd_prepare_shutdown(server);
+ nfs_fscache_release_super_cookie(sb);
nfs_free_server(server);
}
diff --git a/include/linux/nfs_fs_sb.h b/include/linux/nfs_fs_sb.h
index 0a374b9c5093..6ad75948cbf7 100644
--- a/include/linux/nfs_fs_sb.h
+++ b/include/linux/nfs_fs_sb.h
@@ -108,6 +108,11 @@ struct nfs_server {
unsigned long mount_time; /* when this fs was mounted */
dev_t s_dev; /* superblock dev numbers */
+#ifdef CONFIG_NFS_FSCACHE
+ struct nfs_fscache_key *fscache_key; /* unique key for superblock */
+ struct fscache_cookie *fscache; /* superblock cookie */
+#endif
+
#ifdef CONFIG_NFS_V4
u32 attr_bitmask[2];/* V4 bitmask representing the set
of attributes supported on this
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.