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69 lines
2.3 KiB
69 lines
2.3 KiB
package mount
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import (
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"context"
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"github.com/seaweedfs/seaweedfs/weed/util"
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)
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// Forget is called when the kernel discards entries from its
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// dentry cache. This happens on unmount, and when the kernel
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// is short on memory. Since it is not guaranteed to occur at
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// any moment, and since there is no return value, Forget
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// should not do I/O, as there is no channel to report back
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// I/O errors.
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// from https://github.com/libfuse/libfuse/blob/master/include/fuse_lowlevel.h
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/**
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* Forget about an inode
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*
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* This function is called when the kernel removes an inode
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* from its internal caches.
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*
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* The inode's lookup count increases by one for every call to
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* fuse_reply_entry and fuse_reply_create. The nlookup parameter
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* indicates by how much the lookup count should be decreased.
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*
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* Inodes with a non-zero lookup count may receive request from
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* the kernel even after calls to unlink, rmdir or (when
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* overwriting an existing file) rename. Filesystems must handle
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* such requests properly and it is recommended to defer removal
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* of the inode until the lookup count reaches zero. Calls to
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* unlink, rmdir or rename will be followed closely by forget
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* unless the file or directory is open, in which case the
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* kernel issues forget only after the release or releasedir
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* calls.
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*
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* Note that if a file system will be exported over NFS the
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* inodes lifetime must extend even beyond forget. See the
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* generation field in struct fuse_entry_param above.
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*
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* On unmount the lookup count for all inodes implicitly drops
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* to zero. It is not guaranteed that the file system will
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* receive corresponding forget messages for the affected
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* inodes.
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*
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* Valid replies:
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* fuse_reply_none
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*
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* @param req request handle
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* @param ino the inode number
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* @param nlookup the number of lookups to forget
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*/
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/*
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https://libfuse.github.io/doxygen/include_2fuse__lowlevel_8h.html
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int fuse_reply_entry ( fuse_req_t req,
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const struct fuse_entry_param * e
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)
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Reply with a directory entry
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Possible requests: lookup, mknod, mkdir, symlink, link
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Side effects: increments the lookup count on success
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*/
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func (wfs *WFS) Forget(nodeid, nlookup uint64) {
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wfs.inodeToPath.Forget(nodeid, nlookup, func(dir util.FullPath) {
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wfs.metaCache.DeleteFolderChildren(context.Background(), dir)
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})
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wfs.fhMap.ReleaseByInode(nodeid)
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}
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