include/linux/file_compat.h

   1 /*****************************************************************************\
   2  *  Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
   3  *  Copyright (C) 2007 The Regents of the University of California.
   4  *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
   5  *  Written by Brian Behlendorf <behlendorf1@llnl.gov>.
   6  *  UCRL-CODE-235197
   7  *
   8  *  This file is part of the SPL, Solaris Porting Layer.
   9  *  For details, see <http://github.com/behlendorf/spl/>.
  10  *
  11  *  The SPL is free software; you can redistribute it and/or modify it
  12  *  under the terms of the GNU General Public License as published by the
  13  *  Free Software Foundation; either version 2 of the License, or (at your
  14  *  option) any later version.
  15  *
  16  *  The SPL is distributed in the hope that it will be useful, but WITHOUT
  17  *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  18  *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  19  *  for more details.
  20  *
  21  *  You should have received a copy of the GNU General Public License along
  22  *  with the SPL.  If not, see <http://www.gnu.org/licenses/>.
  23 \*****************************************************************************/
  24
  25 #ifndef _SPL_FILE_COMPAT_H
  26 #define _SPL_FILE_COMPAT_H
  27
  28 #include <linux/fs.h>
  29 #ifdef HAVE_FDTABLE_HEADER
  30 #include <linux/fdtable.h>
  31 #endif
  32
  33 static inline struct file *
  34 spl_filp_open(const char *name, int flags, int mode, int *err)
  35 {
  36         struct file *filp = NULL;
  37         int rc;
  38
  39         filp = filp_open(name, flags, mode);
  40         if (IS_ERR(filp)) {
  41                 rc = PTR_ERR(filp);
  42                 if (err)
  43                         *err = rc;
  44                 filp = NULL;
  45         }
  46         return filp;
  47 }
  48
  49 #define spl_filp_close(f)               filp_close(f, NULL)
  50 #define spl_filp_poff(f)                (&(f)->f_pos)
  51 #define spl_filp_write(fp, b, s, p)     (fp)->f_op->write((fp), (b), (s), p)
  52
  53 static inline int
  54 spl_filp_fallocate(struct file *fp, int mode, loff_t offset, loff_t len)
  55 {
  56         int error = -EOPNOTSUPP;
  57
  58 #ifdef HAVE_FILE_FALLOCATE
  59         if (fp->f_op->fallocate)
  60                 error = fp->f_op->fallocate(fp, mode, offset, len);
  61 #else
  62 # ifdef HAVE_INODE_FALLOCATE
  63         if (fp->f_dentry && fp->f_dentry->d_inode &&
  64             fp->f_dentry->d_inode->i_op->fallocate)
  65                 error = fp->f_dentry->d_inode->i_op->fallocate(
  66                     fp->f_dentry->d_inode, mode, offset, len);
  67 # endif /* HAVE_INODE_FALLOCATE */
  68 #endif /*HAVE_FILE_FALLOCATE */
  69
  70         return (error);
  71 }
  72
  73 #ifdef HAVE_VFS_FSYNC
  74 # ifdef HAVE_2ARGS_VFS_FSYNC
  75 #  define spl_filp_fsync(fp, sync)      vfs_fsync(fp, sync)
  76 # else
  77 #  define spl_filp_fsync(fp, sync)      vfs_fsync(fp, (fp)->f_dentry, sync)
  78 # endif /* HAVE_2ARGS_VFS_FSYNC */
  79 #else
  80 # include <linux/buffer_head.h>
  81 # define spl_filp_fsync(fp, sync)       file_fsync(fp, (fp)->f_dentry, sync)
  82 #endif /* HAVE_VFS_FSYNC */
  83
  84 #ifdef HAVE_INODE_I_MUTEX
  85 #define spl_inode_lock(ip)              (mutex_lock(&(ip)->i_mutex))
  86 #define spl_inode_lock_nested(ip, type) (mutex_lock_nested((&(ip)->i_mutex),  \
  87                                         (type)))
  88 #define spl_inode_unlock(ip)            (mutex_unlock(&(ip)->i_mutex))
  89 #else
  90 #define spl_inode_lock(ip)              (down(&(ip)->i_sem))
  91 #define spl_inode_unlock(ip)            (up(&(ip)->i_sem))
  92 #endif /* HAVE_INODE_I_MUTEX */
  93
  94 #ifdef HAVE_KERN_PATH_PARENT_HEADER
  95 # ifndef HAVE_KERN_PATH_PARENT_SYMBOL
  96 typedef int (*kern_path_parent_t)(const char *, struct nameidata *);
  97 extern kern_path_parent_t kern_path_parent_fn;
  98 #  define spl_kern_path_parent(path, nd)        kern_path_parent_fn(path, nd)
  99 # else
 100 #  define spl_kern_path_parent(path, nd)        kern_path_parent(path, nd)
 101 # endif /* HAVE_KERN_PATH_PARENT_SYMBOL */
 102 #else
 103 # define spl_kern_path_parent(path, nd) path_lookup(path, LOOKUP_PARENT, nd)
 104 #endif /* HAVE_KERN_PATH_PARENT_HEADER */
 105
 106 #ifdef HAVE_KERN_PATH_LOCKED
 107 typedef struct dentry * (*kern_path_locked_t)(const char *, struct path *);
 108 extern kern_path_locked_t kern_path_locked_fn;
 109 # define spl_kern_path_locked(name, path)       kern_path_locked_fn(name, path)
 110 #endif /* HAVE_KERN_PATH_LOCKED */
 111
 112 #endif /* SPL_FILE_COMPAT_H */
 113