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supports forget

pull/2668/head
chrislu 3 years ago
parent
commit
3d93570979
  1. 12
      weed/mount/inode_to_path.go
  2. 1
      weed/mount/weedfs.go
  3. 52
      weed/mount/weedfs_forget.go

12
weed/mount/inode_to_path.go

@ -82,3 +82,15 @@ func (i *InodeToPath) RemovePath(path util.FullPath) {
delete(i.inode2path, inode) delete(i.inode2path, inode)
} }
} }
func (i *InodeToPath) RemoveInode(inode uint64) {
if inode == 1 {
return
}
i.RLock()
defer i.RUnlock()
path, found := i.inode2path[inode]
if found {
delete(i.path2inode, path)
delete(i.inode2path, inode)
}
}

1
weed/mount/weedfs.go

@ -120,6 +120,7 @@ func (wfs *WFS) maybeLoadEntry(fullpath util.FullPath) (*filer_pb.Entry, fuse.St
}, fuse.OK }, fuse.OK
} }
// TODO Use inode to selectively filetering metadata updates
// read from async meta cache // read from async meta cache
meta_cache.EnsureVisited(wfs.metaCache, wfs, util.FullPath(dir)) meta_cache.EnsureVisited(wfs.metaCache, wfs, util.FullPath(dir))
cachedEntry, cacheErr := wfs.metaCache.FindEntry(context.Background(), fullpath) cachedEntry, cacheErr := wfs.metaCache.FindEntry(context.Background(), fullpath)

52
weed/mount/weedfs_forget.go

@ -0,0 +1,52 @@
package mount
// Forget is called when the kernel discards entries from its
// dentry cache. This happens on unmount, and when the kernel
// is short on memory. Since it is not guaranteed to occur at
// any moment, and since there is no return value, Forget
// should not do I/O, as there is no channel to report back
// I/O errors.
// from https://github.com/libfuse/libfuse/blob/master/include/fuse_lowlevel.h
/**
* Forget about an inode
*
* This function is called when the kernel removes an inode
* from its internal caches.
*
* The inode's lookup count increases by one for every call to
* fuse_reply_entry and fuse_reply_create. The nlookup parameter
* indicates by how much the lookup count should be decreased.
*
* Inodes with a non-zero lookup count may receive request from
* the kernel even after calls to unlink, rmdir or (when
* overwriting an existing file) rename. Filesystems must handle
* such requests properly and it is recommended to defer removal
* of the inode until the lookup count reaches zero. Calls to
* unlink, rmdir or rename will be followed closely by forget
* unless the file or directory is open, in which case the
* kernel issues forget only after the release or releasedir
* calls.
*
* Note that if a file system will be exported over NFS the
* inodes lifetime must extend even beyond forget. See the
* generation field in struct fuse_entry_param above.
*
* On unmount the lookup count for all inodes implicitly drops
* to zero. It is not guaranteed that the file system will
* receive corresponding forget messages for the affected
* inodes.
*
* Valid replies:
* fuse_reply_none
*
* @param req request handle
* @param ino the inode number
* @param nlookup the number of lookups to forget
*/
func (wfs *WFS) Forget(nodeid, nlookup uint64) {
if nlookup == 0 {
// need to maintain the inode for selective filtering
// and caching for metadata updates
wfs.inodeToPath.RemoveInode(nodeid)
}
}
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