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The kern_path_parent() function was removed from Linux 3.6 because it was observed that all the callers just want the parent dentry. The simpler kern_path_locked() function replaces kern_path_parent() and does the lookup while holding the ->i_mutex lock. This is good news for the vn implementation because it removes the need for us to handle the locking. However, it makes it harder to implement a single readable vn_remove()/vn_rename() function which is usually what we prefer. Therefore, we implement a new version of vn_remove()/vn_rename() for Linux 3.6 and newer kernels. This allows us to leave the existing working implementation untouched, and to add a simpler version for newer kernels. Long term I would very much like to see all of the vn code removed since what this code enabled is generally frowned upon in the kernel. But that can't happen util we either abondon the zpool.cache file or implement alternate infrastructure to update is correctly in user space. Signed-off-by: Yuxuan Shui <yshuiv7@gmail.com> Signed-off-by: Richard Yao <ryao@cs.stonybrook.edu> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #154
98 lines
3.4 KiB
C
98 lines
3.4 KiB
C
/*****************************************************************************\
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* Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
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* Copyright (C) 2007 The Regents of the University of California.
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* Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
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* Written by Brian Behlendorf <behlendorf1@llnl.gov>.
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* UCRL-CODE-235197
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*
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* This file is part of the SPL, Solaris Porting Layer.
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* For details, see <http://github.com/behlendorf/spl/>.
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*
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* The SPL is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* The SPL is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with the SPL. If not, see <http://www.gnu.org/licenses/>.
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\*****************************************************************************/
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#ifndef _SPL_FILE_COMPAT_H
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#define _SPL_FILE_COMPAT_H
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#include <linux/fs.h>
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#ifdef HAVE_FDTABLE_HEADER
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#include <linux/fdtable.h>
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#endif
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static inline struct file *
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spl_filp_open(const char *name, int flags, int mode, int *err)
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{
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struct file *filp = NULL;
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int rc;
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filp = filp_open(name, flags, mode);
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if (IS_ERR(filp)) {
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rc = PTR_ERR(filp);
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if (err)
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*err = rc;
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filp = NULL;
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}
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return filp;
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}
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#define spl_filp_close(f) filp_close(f, NULL)
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#define spl_filp_poff(f) (&(f)->f_pos)
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#define spl_filp_write(fp, b, s, p) (fp)->f_op->write((fp), (b), (s), p)
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#ifdef HAVE_VFS_FSYNC
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# ifdef HAVE_2ARGS_VFS_FSYNC
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# define spl_filp_fsync(fp, sync) vfs_fsync(fp, sync)
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# else
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# define spl_filp_fsync(fp, sync) vfs_fsync(fp, (fp)->f_dentry, sync)
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# endif /* HAVE_2ARGS_VFS_FSYNC */
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#else
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# include <linux/buffer_head.h>
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# define spl_filp_fsync(fp, sync) file_fsync(fp, (fp)->f_dentry, sync)
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#endif /* HAVE_VFS_FSYNC */
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#ifdef HAVE_INODE_I_MUTEX
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#define spl_inode_lock(ip) (mutex_lock(&(ip)->i_mutex))
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#define spl_inode_lock_nested(ip, type) (mutex_lock_nested((&(ip)->i_mutex), \
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(type)))
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#define spl_inode_unlock(ip) (mutex_unlock(&(ip)->i_mutex))
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#else
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#define spl_inode_lock(ip) (down(&(ip)->i_sem))
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#define spl_inode_unlock(ip) (up(&(ip)->i_sem))
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#endif /* HAVE_INODE_I_MUTEX */
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#ifdef HAVE_KERN_PATH_PARENT_HEADER
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# ifndef HAVE_KERN_PATH_PARENT_SYMBOL
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typedef int (*kern_path_parent_t)(const char *, struct nameidata *);
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extern kern_path_parent_t kern_path_parent_fn;
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# define spl_kern_path_parent(path, nd) kern_path_parent_fn(path, nd)
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# else
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# define spl_kern_path_parent(path, nd) kern_path_parent(path, nd)
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# endif /* HAVE_KERN_PATH_PARENT_SYMBOL */
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#else
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# define spl_kern_path_parent(path, nd) path_lookup(path, LOOKUP_PARENT, nd)
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#endif /* HAVE_KERN_PATH_PARENT_HEADER */
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#ifdef HAVE_KERN_PATH_LOCKED
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typedef struct dentry * (*kern_path_locked_t)(const char *, struct path *);
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extern kern_path_locked_t kern_path_locked_fn;
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# define spl_kern_path_locked(name, path) kern_path_locked_fn(name, path)
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#endif /* HAVE_KERN_PATH_LOCKED */
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#ifndef HAVE_CLEAR_CLOSE_ON_EXEC
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#define __clear_close_on_exec(fd, fdt) FD_CLR(fd, fdt->close_on_exec)
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#endif
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#endif /* SPL_FILE_COMPAT_H */
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