9p: don't bother with 4K allocation for 24-byte local array...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --git a/fs/9p/vfs_inode.c b/fs/9p/vfs_inode.c
index 703342e309f57af329085db6d8f0b1b4814793dd..cda68f70d75747f64ac553ab0cb72c1ed14ce4cb 100644 (file)
--- a/fs/9p/vfs_inode.c
+++ b/fs/9p/vfs_inode.c
@@ -1370,6 +1370,8 @@ v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
        return v9fs_vfs_mkspecial(dir, dentry, P9_DMSYMLINK, symname);
 }
 
+#define U32_MAX_DIGITS 10
+
 /**
  * v9fs_vfs_link - create a hardlink
  * @old_dentry: dentry for file to link to
@@ -1383,7 +1385,7 @@ v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir,
              struct dentry *dentry)
 {
        int retval;
-       char *name;
+       char name[1 + U32_MAX_DIGITS + 2]; /* sign + number + \n + \0 */
        struct p9_fid *oldfid;
 
        p9_debug(P9_DEBUG_VFS, " %lu,%pd,%pd\n",
@@ -1393,20 +1395,12 @@ v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir,
        if (IS_ERR(oldfid))
                return PTR_ERR(oldfid);
 
-       name = __getname();
-       if (unlikely(!name)) {
-               retval = -ENOMEM;
-               goto clunk_fid;
-       }
-
        sprintf(name, "%d\n", oldfid->fid);
        retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name);
-       __putname(name);
        if (!retval) {
                v9fs_refresh_inode(oldfid, d_inode(old_dentry));
                v9fs_invalidate_inode_attr(dir);
        }
-clunk_fid:
        p9_client_clunk(oldfid);
        return retval;
 }
@@ -1425,7 +1419,7 @@ v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rde
 {
        struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir);
        int retval;
-       char *name;
+       char name[2 + U32_MAX_DIGITS + 1 + U32_MAX_DIGITS + 1];
        u32 perm;
 
        p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %hx MAJOR: %u MINOR: %u\n",
@@ -1435,26 +1429,16 @@ v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rde
        if (!new_valid_dev(rdev))
                return -EINVAL;
 
-       name = __getname();
-       if (!name)
-               return -ENOMEM;
        /* build extension */
        if (S_ISBLK(mode))
                sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev));
        else if (S_ISCHR(mode))
                sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev));
-       else if (S_ISFIFO(mode))
-               *name = 0;
-       else if (S_ISSOCK(mode))
+       else
                *name = 0;
-       else {
-               __putname(name);
-               return -EINVAL;
-       }
 
        perm = unixmode2p9mode(v9ses, mode);
        retval = v9fs_vfs_mkspecial(dir, dentry, perm, name);
-       __putname(name);
 
        return retval;
 }