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authorDavid Howells <dhowells@redhat.com>2021-06-29 22:37:05 +0100
committerDavid Howells <dhowells@redhat.com>2022-03-18 09:29:05 +0000
commitbc899ee1c898e520574ff4d99356eb2e724a9265 (patch)
treea3a91c584d50d2e567341b4f9ba6fc0a9f40ec12 /include/linux/netfs.h
parenta5c9dc4451394b2854493944dcc0ff71af9705a3 (diff)
netfs: Add a netfs inode context
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 { /* These must be contiguous */ 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 #4) - Fix netfs_is_cache_enabled() to check cookie->cache_priv to see if a cache is present[3]. - Fix netfs_skip_folio_read() to zero out all of the page, not just some of it[3]. ver #3) - Split out the bit to move ceph cap-getting on readahead into ceph_init_request()[1]. - Stick in a comment to the netfs inode structs indicating the contiguity requirements[2]. 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> Acked-by: Jeff Layton <jlayton@kernel.org> cc: linux-cachefs@redhat.com Link: https://lore.kernel.org/r/8af0d47f17d89c06bbf602496dd845f2b0bf25b3.camel@kernel.org/ [1] Link: https://lore.kernel.org/r/beaf4f6a6c2575ed489adb14b257253c868f9a5c.camel@kernel.org/ [2] Link: https://lore.kernel.org/r/3536452.1647421585@warthog.procyon.org.uk/ [3] Link: https://lore.kernel.org/r/164622984545.3564931.15691742939278418580.stgit@warthog.procyon.org.uk/ # v1 Link: https://lore.kernel.org/r/164678213320.1200972.16807551936267647470.stgit@warthog.procyon.org.uk/ # v2 Link: https://lore.kernel.org/r/164692909854.2099075.9535537286264248057.stgit@warthog.procyon.org.uk/ # v3 Link: https://lore.kernel.org/r/306388.1647595110@warthog.procyon.org.uk/ # v4
Diffstat (limited to 'include/linux/netfs.h')
-rw-r--r--include/linux/netfs.h81
1 files changed, 70 insertions, 11 deletions
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
@@ -119,6 +119,16 @@ 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.
*/
struct netfs_cache_resources {
@@ -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 */