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| author | Trond Myklebust <Trond.Myklebust@netapp.com> | 2013-08-22 03:54:08 +0400 |
|---|---|---|
| committer | Trond Myklebust <Trond.Myklebust@netapp.com> | 2013-08-22 16:58:16 +0400 |
| commit | c2dd1378fa3b52ab1705f1ce0bd46d1b91eb1d58 (patch) | |
| tree | 165d773b891ad1ed366de07861001390d3cee168 /fs/nfs/unlink.c | |
| parent | b8a8a0dd506faea934164d30bd1d6f86f8e87b1e (diff) | |
| download | linux-c2dd1378fa3b52ab1705f1ce0bd46d1b91eb1d58.tar.xz | |
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: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'fs/nfs/unlink.c')
| -rw-r--r-- | fs/nfs/unlink.c | 26 |
1 files changed, 16 insertions, 10 deletions
diff --git a/fs/nfs/unlink.c b/fs/nfs/unlink.c index 60395ad3a2e4..488fd162f75b 100644 --- a/fs/nfs/unlink.c +++ b/fs/nfs/unlink.c @@ -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); |