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authorJohn Muir <muirj@nortel.com>2009-05-31 11:13:57 -0400
committerMiklos Szeredi <mszeredi@suse.cz>2009-06-30 20:12:24 +0200
commit3b463ae0c6264f70e5d4c0a9c46af20fed43c96e (patch)
tree03c6abdd0671d74452cbd1f6fc6d637363eb6389 /include/linux/fuse.h
parente0a43ddcc08c34dbd666d93600fd23914505f4aa (diff)
downloadop-kernel-dev-3b463ae0c6264f70e5d4c0a9c46af20fed43c96e.zip
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fuse: invalidation reverse calls
Add notification messages that allow the filesystem to invalidate VFS caches. Two notifications are added: 1) inode invalidation - invalidate cached attributes - invalidate a range of pages in the page cache (this is optional) 2) dentry invalidation - try to invalidate a subtree in the dentry cache Care must be taken while accessing the 'struct super_block' for the mount, as it can go away while an invalidation is in progress. To prevent this, introduce a rw-semaphore, that is taken for read during the invalidation and taken for write in the ->kill_sb callback. Cc: Csaba Henk <csaba@gluster.com> Cc: Anand Avati <avati@zresearch.com> Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Diffstat (limited to 'include/linux/fuse.h')
-rw-r--r--include/linux/fuse.h16
1 files changed, 16 insertions, 0 deletions
diff --git a/include/linux/fuse.h b/include/linux/fuse.h
index e2b816a..cf593bf 100644
--- a/include/linux/fuse.h
+++ b/include/linux/fuse.h
@@ -28,6 +28,8 @@
*
* 7.12
* - add umask flag to input argument of open, mknod and mkdir
+ * - add notification messages for invalidation of inodes and
+ * directory entries
*/
#ifndef _LINUX_FUSE_H
@@ -229,6 +231,8 @@ enum fuse_opcode {
enum fuse_notify_code {
FUSE_NOTIFY_POLL = 1,
+ FUSE_NOTIFY_INVAL_INODE = 2,
+ FUSE_NOTIFY_INVAL_ENTRY = 3,
FUSE_NOTIFY_CODE_MAX,
};
@@ -524,4 +528,16 @@ struct fuse_dirent {
#define FUSE_DIRENT_SIZE(d) \
FUSE_DIRENT_ALIGN(FUSE_NAME_OFFSET + (d)->namelen)
+struct fuse_notify_inval_inode_out {
+ __u64 ino;
+ __s64 off;
+ __s64 len;
+};
+
+struct fuse_notify_inval_entry_out {
+ __u64 parent;
+ __u32 namelen;
+ __u32 padding;
+};
+
#endif /* _LINUX_FUSE_H */
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