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Commit c2dd1378 authored by Trond Myklebust's avatar Trond Myklebust
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NFS: Clean up nfs_sillyrename() 



Optimise for the case where we only do one lookup.
Clean up the code so it is obvious that silly[] is not a dynamic array.

Signed-off-by: default avatarTrond Myklebust <Trond.Myklebust@netapp.com>
parent b8a8a0dd

fs/nfs/unlink.c

+16 −10
Original line number Diff line number Diff line
@@ -444,6 +444,14 @@ nfs_async_rename(struct inode *old_dir, struct inode *new_dir, 
	return rpc_run_task(&task_setup_data);

}



#define SILLYNAME_PREFIX ".nfs"

#define SILLYNAME_PREFIX_LEN ((unsigned)sizeof(SILLYNAME_PREFIX) - 1)

#define SILLYNAME_FILEID_LEN ((unsigned)sizeof(u64) << 1)

#define SILLYNAME_COUNTER_LEN ((unsigned)sizeof(unsigned int) << 1)

#define SILLYNAME_LEN (SILLYNAME_PREFIX_LEN + \

		SILLYNAME_FILEID_LEN + \

		SILLYNAME_COUNTER_LEN)



/**

 * nfs_sillyrename - Perform a silly-rename of a dentry

 * @dir: inode of directory that contains dentry
@@ -469,10 +477,8 @@ int 
nfs_sillyrename(struct inode *dir, struct dentry *dentry)

{

	static unsigned int sillycounter;

	const int      fileidsize  = sizeof(NFS_FILEID(dentry->d_inode))*2;

	const int      countersize = sizeof(sillycounter)*2;

	const int      slen        = sizeof(".nfs")+fileidsize+countersize-1;

	char           silly[slen+1];

	unsigned char silly[SILLYNAME_LEN + 1];

	unsigned long long fileid;

	struct dentry *sdentry;

	struct rpc_task *task;

	int            error = -EIO;
@@ -489,20 +495,20 @@ nfs_sillyrename(struct inode *dir, struct dentry *dentry) 
	if (dentry->d_flags & DCACHE_NFSFS_RENAMED)

		goto out;



	sprintf(silly, ".nfs%*.*Lx",

		fileidsize, fileidsize,

		(unsigned long long)NFS_FILEID(dentry->d_inode));

	fileid = NFS_FILEID(dentry->d_inode);



	/* Return delegation in anticipation of the rename */

	NFS_PROTO(dentry->d_inode)->return_delegation(dentry->d_inode);



	sdentry = NULL;

	do {

		char *suffix = silly + slen - countersize;



		int slen;

		dput(sdentry);

		sillycounter++;

		sprintf(suffix, "%*.*x", countersize, countersize, sillycounter);

		slen = scnprintf(silly, sizeof(silly),

				SILLYNAME_PREFIX "%0*llx%0*x",

				SILLYNAME_FILEID_LEN, fileid,

				SILLYNAME_COUNTER_LEN, sillycounter);



		dfprintk(VFS, "NFS: trying to rename %s to %s\n",

				dentry->d_name.name, silly);