• Linus Torvalds's avatar
    Merge tag 'copy-file-range-fixes-1' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux · 40f06c79
    Linus Torvalds authored
    Pull copy_file_range updates from Darrick Wong:
     "This fixes numerous parameter checking problems and inconsistent
      behaviors in the new(ish) copy_file_range system call.
    
      Now the system call will actually check its range parameters
      correctly; refuse to copy into files for which the caller does not
      have sufficient privileges; update mtime and strip setuid like file
      writes are supposed to do; and allows copying up to the EOF of the
      source file instead of failing the call like we used to.
    
      Summary:
    
       - Create a generic copy_file_range handler and make individual
         filesystems responsible for calling it (i.e. no more assuming that
         do_splice_direct will work or is appropriate)
    
       - Refactor copy_file_range and remap_range parameter checking where
         they are the same
    
       - Install missing copy_file_range parameter checking(!)
    
       - Remove suid/sgid and update mtime like any other file write
    
       - Change the behavior so that a copy range crossing the source file's
         eof will result in a short copy to the source file's eof instead of
         EINVAL
    
       - Permit filesystems to decide if they want to handle
         cross-superblock copy_file_range in their local handlers"
    
    * tag 'copy-file-range-fixes-1' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux:
      fuse: copy_file_range needs to strip setuid bits and update timestamps
      vfs: allow copy_file_range to copy across devices
      xfs: use file_modified() helper
      vfs: introduce file_modified() helper
      vfs: add missing checks to copy_file_range
      vfs: remove redundant checks from generic_remap_checks()
      vfs: introduce generic_file_rw_checks()
      vfs: no fallback for ->copy_file_range
      vfs: introduce generic_copy_file_range()
    40f06c79
cifsfs.c 42.6 KB