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authorTrond Myklebust <Trond.Myklebust@netapp.com>2013-08-22 03:54:08 +0400
committerTrond Myklebust <Trond.Myklebust@netapp.com>2013-08-22 16:58:16 +0400
commitc2dd1378fa3b52ab1705f1ce0bd46d1b91eb1d58 (patch)
tree165d773b891ad1ed366de07861001390d3cee168 /fs/nfs/unlink.c
parentb8a8a0dd506faea934164d30bd1d6f86f8e87b1e (diff)
downloadlinux-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.c26
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);