summaryrefslogtreecommitdiff
path: root/include
diff options
context:
space:
mode:
authorLinus Torvalds <torvalds@linux-foundation.org>2011-05-26 21:50:56 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2011-05-26 21:50:56 +0400
commitf8d613e2a665bf1be9628a3c3f9bafe7599b32c0 (patch)
tree98d4da8d0e1a5fb1d9064626b4b96d95ccf26375 /include
parent8a0599dd2471f2a2e409498c08a0ab339057ad06 (diff)
parent5bc20fc59706214d9591c11e1938a629d3538c12 (diff)
downloadlinux-f8d613e2a665bf1be9628a3c3f9bafe7599b32c0.tar.xz
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/djm/tmem
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/djm/tmem: xen: cleancache shim to Xen Transcendent Memory ocfs2: add cleancache support ext4: add cleancache support btrfs: add cleancache support ext3: add cleancache support mm/fs: add hooks to support cleancache mm: cleancache core ops functions and config fs: add field to superblock to support cleancache mm/fs: cleancache documentation Fix up trivial conflict in fs/btrfs/extent_io.c due to includes
Diffstat (limited to 'include')
-rw-r--r--include/linux/cleancache.h122
-rw-r--r--include/linux/fs.h5
-rw-r--r--include/xen/interface/xen.h22
3 files changed, 149 insertions, 0 deletions
diff --git a/include/linux/cleancache.h b/include/linux/cleancache.h
new file mode 100644
index 000000000000..04ffb2e6c9d0
--- /dev/null
+++ b/include/linux/cleancache.h
@@ -0,0 +1,122 @@
+#ifndef _LINUX_CLEANCACHE_H
+#define _LINUX_CLEANCACHE_H
+
+#include <linux/fs.h>
+#include <linux/exportfs.h>
+#include <linux/mm.h>
+
+#define CLEANCACHE_KEY_MAX 6
+
+/*
+ * cleancache requires every file with a page in cleancache to have a
+ * unique key unless/until the file is removed/truncated. For some
+ * filesystems, the inode number is unique, but for "modern" filesystems
+ * an exportable filehandle is required (see exportfs.h)
+ */
+struct cleancache_filekey {
+ union {
+ ino_t ino;
+ __u32 fh[CLEANCACHE_KEY_MAX];
+ u32 key[CLEANCACHE_KEY_MAX];
+ } u;
+};
+
+struct cleancache_ops {
+ int (*init_fs)(size_t);
+ int (*init_shared_fs)(char *uuid, size_t);
+ int (*get_page)(int, struct cleancache_filekey,
+ pgoff_t, struct page *);
+ void (*put_page)(int, struct cleancache_filekey,
+ pgoff_t, struct page *);
+ void (*flush_page)(int, struct cleancache_filekey, pgoff_t);
+ void (*flush_inode)(int, struct cleancache_filekey);
+ void (*flush_fs)(int);
+};
+
+extern struct cleancache_ops
+ cleancache_register_ops(struct cleancache_ops *ops);
+extern void __cleancache_init_fs(struct super_block *);
+extern void __cleancache_init_shared_fs(char *, struct super_block *);
+extern int __cleancache_get_page(struct page *);
+extern void __cleancache_put_page(struct page *);
+extern void __cleancache_flush_page(struct address_space *, struct page *);
+extern void __cleancache_flush_inode(struct address_space *);
+extern void __cleancache_flush_fs(struct super_block *);
+extern int cleancache_enabled;
+
+#ifdef CONFIG_CLEANCACHE
+static inline bool cleancache_fs_enabled(struct page *page)
+{
+ return page->mapping->host->i_sb->cleancache_poolid >= 0;
+}
+static inline bool cleancache_fs_enabled_mapping(struct address_space *mapping)
+{
+ return mapping->host->i_sb->cleancache_poolid >= 0;
+}
+#else
+#define cleancache_enabled (0)
+#define cleancache_fs_enabled(_page) (0)
+#define cleancache_fs_enabled_mapping(_page) (0)
+#endif
+
+/*
+ * The shim layer provided by these inline functions allows the compiler
+ * to reduce all cleancache hooks to nothingness if CONFIG_CLEANCACHE
+ * is disabled, to a single global variable check if CONFIG_CLEANCACHE
+ * is enabled but no cleancache "backend" has dynamically enabled it,
+ * and, for the most frequent cleancache ops, to a single global variable
+ * check plus a superblock element comparison if CONFIG_CLEANCACHE is enabled
+ * and a cleancache backend has dynamically enabled cleancache, but the
+ * filesystem referenced by that cleancache op has not enabled cleancache.
+ * As a result, CONFIG_CLEANCACHE can be enabled by default with essentially
+ * no measurable performance impact.
+ */
+
+static inline void cleancache_init_fs(struct super_block *sb)
+{
+ if (cleancache_enabled)
+ __cleancache_init_fs(sb);
+}
+
+static inline void cleancache_init_shared_fs(char *uuid, struct super_block *sb)
+{
+ if (cleancache_enabled)
+ __cleancache_init_shared_fs(uuid, sb);
+}
+
+static inline int cleancache_get_page(struct page *page)
+{
+ int ret = -1;
+
+ if (cleancache_enabled && cleancache_fs_enabled(page))
+ ret = __cleancache_get_page(page);
+ return ret;
+}
+
+static inline void cleancache_put_page(struct page *page)
+{
+ if (cleancache_enabled && cleancache_fs_enabled(page))
+ __cleancache_put_page(page);
+}
+
+static inline void cleancache_flush_page(struct address_space *mapping,
+ struct page *page)
+{
+ /* careful... page->mapping is NULL sometimes when this is called */
+ if (cleancache_enabled && cleancache_fs_enabled_mapping(mapping))
+ __cleancache_flush_page(mapping, page);
+}
+
+static inline void cleancache_flush_inode(struct address_space *mapping)
+{
+ if (cleancache_enabled && cleancache_fs_enabled_mapping(mapping))
+ __cleancache_flush_inode(mapping);
+}
+
+static inline void cleancache_flush_fs(struct super_block *sb)
+{
+ if (cleancache_enabled)
+ __cleancache_flush_fs(sb);
+}
+
+#endif /* _LINUX_CLEANCACHE_H */
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 3f9d3251790d..241609346dfb 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1428,6 +1428,11 @@ struct super_block {
*/
char __rcu *s_options;
const struct dentry_operations *s_d_op; /* default d_op for dentries */
+
+ /*
+ * Saved pool identifier for cleancache (-1 means none)
+ */
+ int cleancache_poolid;
};
extern struct timespec current_fs_time(struct super_block *sb);
diff --git a/include/xen/interface/xen.h b/include/xen/interface/xen.h
index b33257bc7e83..70213b4515eb 100644
--- a/include/xen/interface/xen.h
+++ b/include/xen/interface/xen.h
@@ -58,6 +58,7 @@
#define __HYPERVISOR_event_channel_op 32
#define __HYPERVISOR_physdev_op 33
#define __HYPERVISOR_hvm_op 34
+#define __HYPERVISOR_tmem_op 38
/* Architecture-specific hypercall definitions. */
#define __HYPERVISOR_arch_0 48
@@ -461,6 +462,27 @@ typedef uint8_t xen_domain_handle_t[16];
#define __mk_unsigned_long(x) x ## UL
#define mk_unsigned_long(x) __mk_unsigned_long(x)
+#define TMEM_SPEC_VERSION 1
+
+struct tmem_op {
+ uint32_t cmd;
+ int32_t pool_id;
+ union {
+ struct { /* for cmd == TMEM_NEW_POOL */
+ uint64_t uuid[2];
+ uint32_t flags;
+ } new;
+ struct {
+ uint64_t oid[3];
+ uint32_t index;
+ uint32_t tmem_offset;
+ uint32_t pfn_offset;
+ uint32_t len;
+ GUEST_HANDLE(void) gmfn; /* guest machine page frame */
+ } gen;
+ } u;
+};
+
#else /* __ASSEMBLY__ */
/* In assembly code we cannot use C numeric constant suffixes. */