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authorJohn Muir <muirj@nortel.com>2009-05-31 19:13:57 +0400
committerMiklos Szeredi <mszeredi@suse.cz>2009-06-30 22:12:24 +0400
commit3b463ae0c6264f70e5d4c0a9c46af20fed43c96e (patch)
tree03c6abdd0671d74452cbd1f6fc6d637363eb6389 /fs/fuse/dir.c
parente0a43ddcc08c34dbd666d93600fd23914505f4aa (diff)
downloadlinux-3b463ae0c6264f70e5d4c0a9c46af20fed43c96e.tar.xz
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 'fs/fuse/dir.c')
-rw-r--r--fs/fuse/dir.c37
1 files changed, 37 insertions, 0 deletions
diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c
index 6b700734e519..e703654e7f40 100644
--- a/fs/fuse/dir.c
+++ b/fs/fuse/dir.c
@@ -859,6 +859,43 @@ int fuse_update_attributes(struct inode *inode, struct kstat *stat,
return err;
}
+int fuse_reverse_inval_entry(struct super_block *sb, u64 parent_nodeid,
+ struct qstr *name)
+{
+ int err = -ENOTDIR;
+ struct inode *parent;
+ struct dentry *dir;
+ struct dentry *entry;
+
+ parent = ilookup5(sb, parent_nodeid, fuse_inode_eq, &parent_nodeid);
+ if (!parent)
+ return -ENOENT;
+
+ mutex_lock(&parent->i_mutex);
+ if (!S_ISDIR(parent->i_mode))
+ goto unlock;
+
+ err = -ENOENT;
+ dir = d_find_alias(parent);
+ if (!dir)
+ goto unlock;
+
+ entry = d_lookup(dir, name);
+ dput(dir);
+ if (!entry)
+ goto unlock;
+
+ fuse_invalidate_attr(parent);
+ fuse_invalidate_entry(entry);
+ dput(entry);
+ err = 0;
+
+ unlock:
+ mutex_unlock(&parent->i_mutex);
+ iput(parent);
+ return err;
+}
+
/*
* Calling into a user-controlled filesystem gives the filesystem
* daemon ptrace-like capabilities over the requester process. This