mirror of
https://github.com/seaweedfs/seaweedfs.git
synced 2024-12-28 03:47:57 +08:00
70 lines
2.3 KiB
Go
70 lines
2.3 KiB
Go
package mount
|
|
|
|
import (
|
|
"context"
|
|
"github.com/seaweedfs/seaweedfs/weed/util"
|
|
)
|
|
|
|
// 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
|
|
*/
|
|
/*
|
|
https://libfuse.github.io/doxygen/include_2fuse__lowlevel_8h.html
|
|
|
|
int fuse_reply_entry ( fuse_req_t req,
|
|
const struct fuse_entry_param * e
|
|
)
|
|
Reply with a directory entry
|
|
|
|
Possible requests: lookup, mknod, mkdir, symlink, link
|
|
|
|
Side effects: increments the lookup count on success
|
|
|
|
*/
|
|
func (wfs *WFS) Forget(nodeid, nlookup uint64) {
|
|
wfs.inodeToPath.Forget(nodeid, nlookup, func(dir util.FullPath) {
|
|
wfs.metaCache.DeleteFolderChildren(context.Background(), dir)
|
|
})
|
|
wfs.fhmap.ReleaseByInode(nodeid)
|
|
}
|