Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

Pull second set of VFS changes from Al Viro:
 "Assorted f_pos race fixes, making do_splice_direct() safe to call with
  i_mutex on parent, O_TMPFILE support, Jeff's locks.c series,
  ->d_hash/->d_compare calling conventions changes from Linus, misc
  stuff all over the place."

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: (63 commits)
  Document ->tmpfile()
  ext4: ->tmpfile() support
  vfs: export lseek_execute() to modules
  lseek_execute() doesn't need an inode passed to it
  block_dev: switch to fixed_size_llseek()
  cpqphp_sysfs: switch to fixed_size_llseek()
  tile-srom: switch to fixed_size_llseek()
  proc_powerpc: switch to fixed_size_llseek()
  ubi/cdev: switch to fixed_size_llseek()
  pci/proc: switch to fixed_size_llseek()
  isapnp: switch to fixed_size_llseek()
  lpfc: switch to fixed_size_llseek()
  locks: give the blocked_hash its own spinlock
  locks: add a new "lm_owner_key" lock operation
  locks: turn the blocked_list into a hashtable
  locks: convert fl_link to a hlist_node
  locks: avoid taking global lock if possible when waking up blocked waiters
  locks: protect most of the file_lock handling with i_lock
  locks: encapsulate the fl_link list handling
  locks: make "added" in __posix_lock_file a bool
  ...

1 files changed, 33 insertions, 4 deletions

diff --git a/mm/shmem.c b/mm/shmem.c
index 5e6a8422658b..118dfa4952f4 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -1798,10 +1798,7 @@ static loff_t shmem_file_llseek(struct file *file, loff_t offset, int whence)
                 }
         }
 
-        if (offset >= 0 && offset != file->f_pos) {
-                file->f_pos = offset;
-                file->f_version = 0;
-        }
+        offset = vfs_setpos(file, offset, MAX_LFS_FILESIZE);
         mutex_unlock(&inode->i_mutex);
         return offset;
 }
@@ -1965,6 +1962,37 @@ shmem_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t dev)
         return error;
 }
 
+static int
+shmem_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
+{
+        struct inode *inode;
+        int error = -ENOSPC;
+
+        inode = shmem_get_inode(dir->i_sb, dir, mode, 0, VM_NORESERVE);
+        if (inode) {
+                error = security_inode_init_security(inode, dir,
+                                                     NULL,
+                                                     shmem_initxattrs, NULL);
+                if (error) {
+                        if (error != -EOPNOTSUPP) {
+                                iput(inode);
+                                return error;
+                        }
+                }
+#ifdef CONFIG_TMPFS_POSIX_ACL
+                error = generic_acl_init(inode, dir);
+                if (error) {
+                        iput(inode);
+                        return error;
+                }
+#else
+                error = 0;
+#endif
+                d_tmpfile(dentry, inode);
+        }
+        return error;
+}
+
 static int shmem_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
 {
         int error;
@@ -2723,6 +2751,7 @@ static const struct inode_operations shmem_dir_inode_operations = {
         .rmdir          = shmem_rmdir,
         .mknod          = shmem_mknod,
         .rename         = shmem_rename,
+        .tmpfile        = shmem_tmpfile,
 #endif
 #ifdef CONFIG_TMPFS_XATTR
         .setxattr       = shmem_setxattr,