vfs_inode_dotl.c 25.1 KB
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/*
 *  linux/fs/9p/vfs_inode_dotl.c
 *
 * This file contains vfs inode ops for the 9P2000.L protocol.
 *
 *  Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
 *  Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2
 *  as published by the Free Software Foundation.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to:
 *  Free Software Foundation
 *  51 Franklin Street, Fifth Floor
 *  Boston, MA  02111-1301  USA
 *
 */

#include <linux/module.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/file.h>
#include <linux/pagemap.h>
#include <linux/stat.h>
#include <linux/string.h>
#include <linux/inet.h>
#include <linux/namei.h>
#include <linux/idr.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/xattr.h>
#include <linux/posix_acl.h>
#include <net/9p/9p.h>
#include <net/9p/client.h>

#include "v9fs.h"
#include "v9fs_vfs.h"
#include "fid.h"
#include "cache.h"
#include "xattr.h"
#include "acl.h"

static int
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v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
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		    dev_t rdev);

/**
 * v9fs_get_fsgid_for_create - Helper function to get the gid for creating a
 * new file system object. This checks the S_ISGID to determine the owning
 * group of the new file system object.
 */

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static kgid_t v9fs_get_fsgid_for_create(struct inode *dir_inode)
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{
	BUG_ON(dir_inode == NULL);

	if (dir_inode->i_mode & S_ISGID) {
		/* set_gid bit is set.*/
		return dir_inode->i_gid;
	}
	return current_fsgid();
}

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static int v9fs_test_inode_dotl(struct inode *inode, void *data)
{
	struct v9fs_inode *v9inode = V9FS_I(inode);
	struct p9_stat_dotl *st = (struct p9_stat_dotl *)data;

	/* don't match inode of different type */
	if ((inode->i_mode & S_IFMT) != (st->st_mode & S_IFMT))
		return 0;

	if (inode->i_generation != st->st_gen)
		return 0;

	/* compare qid details */
	if (memcmp(&v9inode->qid.version,
		   &st->qid.version, sizeof(v9inode->qid.version)))
		return 0;

	if (v9inode->qid.type != st->qid.type)
		return 0;
	return 1;
}

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/* Always get a new inode */
static int v9fs_test_new_inode_dotl(struct inode *inode, void *data)
{
	return 0;
}

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static int v9fs_set_inode_dotl(struct inode *inode,  void *data)
{
	struct v9fs_inode *v9inode = V9FS_I(inode);
	struct p9_stat_dotl *st = (struct p9_stat_dotl *)data;

	memcpy(&v9inode->qid, &st->qid, sizeof(st->qid));
	inode->i_generation = st->st_gen;
	return 0;
}

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static struct inode *v9fs_qid_iget_dotl(struct super_block *sb,
					struct p9_qid *qid,
					struct p9_fid *fid,
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					struct p9_stat_dotl *st,
					int new)
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{
	int retval;
	unsigned long i_ino;
	struct inode *inode;
	struct v9fs_session_info *v9ses = sb->s_fs_info;
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	int (*test)(struct inode *, void *);

	if (new)
		test = v9fs_test_new_inode_dotl;
	else
		test = v9fs_test_inode_dotl;
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	i_ino = v9fs_qid2ino(qid);
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	inode = iget5_locked(sb, i_ino, test, v9fs_set_inode_dotl, st);
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	if (!inode)
		return ERR_PTR(-ENOMEM);
	if (!(inode->i_state & I_NEW))
		return inode;
	/*
	 * initialize the inode with the stat info
	 * FIXME!! we may need support for stale inodes
	 * later.
	 */
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	inode->i_ino = i_ino;
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	retval = v9fs_init_inode(v9ses, inode,
				 st->st_mode, new_decode_dev(st->st_rdev));
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	if (retval)
		goto error;

	v9fs_stat2inode_dotl(st, inode);
	v9fs_cache_inode_get_cookie(inode);
	retval = v9fs_get_acl(inode, fid);
	if (retval)
		goto error;

	unlock_new_inode(inode);
	return inode;
error:
	unlock_new_inode(inode);
	iput(inode);
	return ERR_PTR(retval);

}

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struct inode *
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v9fs_inode_from_fid_dotl(struct v9fs_session_info *v9ses, struct p9_fid *fid,
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			 struct super_block *sb, int new)
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{
	struct p9_stat_dotl *st;
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	struct inode *inode = NULL;
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	st = p9_client_getattr_dotl(fid, P9_STATS_BASIC | P9_STATS_GEN);
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	if (IS_ERR(st))
		return ERR_CAST(st);

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	inode = v9fs_qid_iget_dotl(sb, &st->qid, fid, st, new);
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	kfree(st);
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	return inode;
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}

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struct dotl_openflag_map {
	int open_flag;
	int dotl_flag;
};

static int v9fs_mapped_dotl_flags(int flags)
{
	int i;
	int rflags = 0;
	struct dotl_openflag_map dotl_oflag_map[] = {
		{ O_CREAT,	P9_DOTL_CREATE },
		{ O_EXCL,	P9_DOTL_EXCL },
		{ O_NOCTTY,	P9_DOTL_NOCTTY },
		{ O_APPEND,	P9_DOTL_APPEND },
		{ O_NONBLOCK,	P9_DOTL_NONBLOCK },
		{ O_DSYNC,	P9_DOTL_DSYNC },
		{ FASYNC,	P9_DOTL_FASYNC },
		{ O_DIRECT,	P9_DOTL_DIRECT },
		{ O_LARGEFILE,	P9_DOTL_LARGEFILE },
		{ O_DIRECTORY,	P9_DOTL_DIRECTORY },
		{ O_NOFOLLOW,	P9_DOTL_NOFOLLOW },
		{ O_NOATIME,	P9_DOTL_NOATIME },
		{ O_CLOEXEC,	P9_DOTL_CLOEXEC },
		{ O_SYNC,	P9_DOTL_SYNC},
	};
	for (i = 0; i < ARRAY_SIZE(dotl_oflag_map); i++) {
		if (flags & dotl_oflag_map[i].open_flag)
			rflags |= dotl_oflag_map[i].dotl_flag;
	}
	return rflags;
}

/**
 * v9fs_open_to_dotl_flags- convert Linux specific open flags to
 * plan 9 open flag.
 * @flags: flags to convert
 */
int v9fs_open_to_dotl_flags(int flags)
{
	int rflags = 0;

	/*
	 * We have same bits for P9_DOTL_READONLY, P9_DOTL_WRONLY
	 * and P9_DOTL_NOACCESS
	 */
	rflags |= flags & O_ACCMODE;
	rflags |= v9fs_mapped_dotl_flags(flags);

	return rflags;
}

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/**
 * v9fs_vfs_create_dotl - VFS hook to create files for 9P2000.L protocol.
 * @dir: directory inode that is being created
 * @dentry:  dentry that is being deleted
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 * @omode: create permissions
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 *
 */

static int
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v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
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		bool excl)
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{
	return v9fs_vfs_mknod_dotl(dir, dentry, omode, 0);
}

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static int
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v9fs_vfs_atomic_open_dotl(struct inode *dir, struct dentry *dentry,
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			  struct file *file, unsigned flags, umode_t omode,
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			  int *opened)
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{
	int err = 0;
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	kgid_t gid;
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	umode_t mode;
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	char *name = NULL;
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	struct p9_qid qid;
	struct inode *inode;
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	struct p9_fid *fid = NULL;
	struct v9fs_inode *v9inode;
	struct p9_fid *dfid, *ofid, *inode_fid;
	struct v9fs_session_info *v9ses;
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	struct posix_acl *pacl = NULL, *dacl = NULL;
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	struct dentry *res = NULL;
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	if (d_unhashed(dentry)) {
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		res = v9fs_vfs_lookup(dir, dentry, 0);
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		if (IS_ERR(res))
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			return PTR_ERR(res);
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		if (res)
			dentry = res;
	}

	/* Only creates */
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	if (!(flags & O_CREAT) || dentry->d_inode)
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		return	finish_no_open(file, res);
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	v9ses = v9fs_inode2v9ses(dir);

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	name = (char *) dentry->d_name.name;
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	p9_debug(P9_DEBUG_VFS, "name:%s flags:0x%x mode:0x%hx\n",
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		 name, flags, omode);
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	dfid = v9fs_fid_lookup(dentry->d_parent);
	if (IS_ERR(dfid)) {
		err = PTR_ERR(dfid);
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		p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
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		goto out;
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	}

	/* clone a fid to use for creation */
	ofid = p9_client_walk(dfid, 0, NULL, 1);
	if (IS_ERR(ofid)) {
		err = PTR_ERR(ofid);
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		p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
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		goto out;
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	}

	gid = v9fs_get_fsgid_for_create(dir);

	mode = omode;
	/* Update mode based on ACL value */
	err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
	if (err) {
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		p9_debug(P9_DEBUG_VFS, "Failed to get acl values in creat %d\n",
			 err);
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		goto error;
	}
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	err = p9_client_create_dotl(ofid, name, v9fs_open_to_dotl_flags(flags),
				    mode, gid, &qid);
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	if (err < 0) {
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		p9_debug(P9_DEBUG_VFS, "p9_client_open_dotl failed in creat %d\n",
			 err);
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		goto error;
	}
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	v9fs_invalidate_inode_attr(dir);
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	/* instantiate inode and assign the unopened fid to the dentry */
	fid = p9_client_walk(dfid, 1, &name, 1);
	if (IS_ERR(fid)) {
		err = PTR_ERR(fid);
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		p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
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		fid = NULL;
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		goto error;
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	}
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	inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
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	if (IS_ERR(inode)) {
		err = PTR_ERR(inode);
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		p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", err);
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		goto error;
	}
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	/* Now set the ACL based on the default value */
	v9fs_set_create_acl(inode, fid, dacl, pacl);

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	v9fs_fid_add(dentry, fid);
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	d_instantiate(dentry, inode);
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	v9inode = V9FS_I(inode);
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	mutex_lock(&v9inode->v_mutex);
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	if ((v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) &&
	    !v9inode->writeback_fid &&
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	    ((flags & O_ACCMODE) != O_RDONLY)) {
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		/*
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		 * clone a fid and add it to writeback_fid
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		 * we do it during open time instead of
		 * page dirty time via write_begin/page_mkwrite
		 * because we want write after unlink usecase
		 * to work.
		 */
		inode_fid = v9fs_writeback_fid(dentry);
		if (IS_ERR(inode_fid)) {
			err = PTR_ERR(inode_fid);
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			mutex_unlock(&v9inode->v_mutex);
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			goto err_clunk_old_fid;
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		}
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		v9inode->writeback_fid = (void *) inode_fid;
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	}
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	mutex_unlock(&v9inode->v_mutex);
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	/* Since we are opening a file, assign the open fid to the file */
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	err = finish_open(file, dentry, generic_file_open, opened);
	if (err)
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		goto err_clunk_old_fid;
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	file->private_data = ofid;
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	if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
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		v9fs_cache_inode_set_cookie(inode, file);
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	*opened |= FILE_CREATED;
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out:
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	v9fs_put_acl(dacl, pacl);
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	dput(res);
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	return err;
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error:
	if (fid)
		p9_client_clunk(fid);
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err_clunk_old_fid:
	if (ofid)
		p9_client_clunk(ofid);
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	goto out;
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}

/**
 * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory
 * @dir:  inode that is being unlinked
 * @dentry: dentry that is being unlinked
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 * @omode: mode for new directory
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 *
 */

static int v9fs_vfs_mkdir_dotl(struct inode *dir,
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			       struct dentry *dentry, umode_t omode)
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{
	int err;
	struct v9fs_session_info *v9ses;
	struct p9_fid *fid = NULL, *dfid = NULL;
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	kgid_t gid;
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	char *name;
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	umode_t mode;
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	struct inode *inode;
	struct p9_qid qid;
	struct dentry *dir_dentry;
	struct posix_acl *dacl = NULL, *pacl = NULL;

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	p9_debug(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);
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	err = 0;
	v9ses = v9fs_inode2v9ses(dir);

	omode |= S_IFDIR;
	if (dir->i_mode & S_ISGID)
		omode |= S_ISGID;

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	dir_dentry = dentry->d_parent;
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	dfid = v9fs_fid_lookup(dir_dentry);
	if (IS_ERR(dfid)) {
		err = PTR_ERR(dfid);
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		p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
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		dfid = NULL;
		goto error;
	}

	gid = v9fs_get_fsgid_for_create(dir);
	mode = omode;
	/* Update mode based on ACL value */
	err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
	if (err) {
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		p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mkdir %d\n",
			 err);
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		goto error;
	}
	name = (char *) dentry->d_name.name;
	err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid);
	if (err < 0)
		goto error;

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	fid = p9_client_walk(dfid, 1, &name, 1);
	if (IS_ERR(fid)) {
		err = PTR_ERR(fid);
		p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
			 err);
		fid = NULL;
		goto error;
	}

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	/* instantiate inode and assign the unopened fid to the dentry */
	if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
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		inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
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		if (IS_ERR(inode)) {
			err = PTR_ERR(inode);
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			p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
				 err);
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			goto error;
		}
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		v9fs_fid_add(dentry, fid);
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		v9fs_set_create_acl(inode, fid, dacl, pacl);
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		d_instantiate(dentry, inode);
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		fid = NULL;
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		err = 0;
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	} else {
		/*
		 * Not in cached mode. No need to populate
		 * inode with stat. We need to get an inode
		 * so that we can set the acl with dentry
		 */
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		inode = v9fs_get_inode(dir->i_sb, mode, 0);
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		if (IS_ERR(inode)) {
			err = PTR_ERR(inode);
			goto error;
		}
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		v9fs_set_create_acl(inode, fid, dacl, pacl);
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		d_instantiate(dentry, inode);
	}
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	inc_nlink(dir);
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	v9fs_invalidate_inode_attr(dir);
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error:
	if (fid)
		p9_client_clunk(fid);
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	v9fs_put_acl(dacl, pacl);
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	return err;
}

static int
v9fs_vfs_getattr_dotl(struct vfsmount *mnt, struct dentry *dentry,
		 struct kstat *stat)
{
	struct v9fs_session_info *v9ses;
	struct p9_fid *fid;
	struct p9_stat_dotl *st;

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	p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry);
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	v9ses = v9fs_dentry2v9ses(dentry);
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	if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
		generic_fillattr(dentry->d_inode, stat);
		return 0;
	}
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	fid = v9fs_fid_lookup(dentry);
	if (IS_ERR(fid))
		return PTR_ERR(fid);

	/* Ask for all the fields in stat structure. Server will return
	 * whatever it supports
	 */

	st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
	if (IS_ERR(st))
		return PTR_ERR(st);

	v9fs_stat2inode_dotl(st, dentry->d_inode);
	generic_fillattr(dentry->d_inode, stat);
	/* Change block size to what the server returned */
	stat->blksize = st->st_blksize;

	kfree(st);
	return 0;
}

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/*
 * Attribute flags.
 */
#define P9_ATTR_MODE		(1 << 0)
#define P9_ATTR_UID		(1 << 1)
#define P9_ATTR_GID		(1 << 2)
#define P9_ATTR_SIZE		(1 << 3)
#define P9_ATTR_ATIME		(1 << 4)
#define P9_ATTR_MTIME		(1 << 5)
#define P9_ATTR_CTIME		(1 << 6)
#define P9_ATTR_ATIME_SET	(1 << 7)
#define P9_ATTR_MTIME_SET	(1 << 8)

struct dotl_iattr_map {
	int iattr_valid;
	int p9_iattr_valid;
};

static int v9fs_mapped_iattr_valid(int iattr_valid)
{
	int i;
	int p9_iattr_valid = 0;
	struct dotl_iattr_map dotl_iattr_map[] = {
		{ ATTR_MODE,		P9_ATTR_MODE },
		{ ATTR_UID,		P9_ATTR_UID },
		{ ATTR_GID,		P9_ATTR_GID },
		{ ATTR_SIZE,		P9_ATTR_SIZE },
		{ ATTR_ATIME,		P9_ATTR_ATIME },
		{ ATTR_MTIME,		P9_ATTR_MTIME },
		{ ATTR_CTIME,		P9_ATTR_CTIME },
		{ ATTR_ATIME_SET,	P9_ATTR_ATIME_SET },
		{ ATTR_MTIME_SET,	P9_ATTR_MTIME_SET },
	};
	for (i = 0; i < ARRAY_SIZE(dotl_iattr_map); i++) {
		if (iattr_valid & dotl_iattr_map[i].iattr_valid)
			p9_iattr_valid |= dotl_iattr_map[i].p9_iattr_valid;
	}
	return p9_iattr_valid;
}

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/**
 * v9fs_vfs_setattr_dotl - set file metadata
 * @dentry: file whose metadata to set
 * @iattr: metadata assignment structure
 *
 */

int v9fs_vfs_setattr_dotl(struct dentry *dentry, struct iattr *iattr)
{
	int retval;
	struct p9_fid *fid;
	struct p9_iattr_dotl p9attr;
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	struct inode *inode = dentry->d_inode;
561

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	p9_debug(P9_DEBUG_VFS, "\n");
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	retval = inode_change_ok(inode, iattr);
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	if (retval)
		return retval;

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	p9attr.valid = v9fs_mapped_iattr_valid(iattr->ia_valid);
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	p9attr.mode = iattr->ia_mode;
	p9attr.uid = iattr->ia_uid;
	p9attr.gid = iattr->ia_gid;
	p9attr.size = iattr->ia_size;
	p9attr.atime_sec = iattr->ia_atime.tv_sec;
	p9attr.atime_nsec = iattr->ia_atime.tv_nsec;
	p9attr.mtime_sec = iattr->ia_mtime.tv_sec;
	p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec;

	fid = v9fs_fid_lookup(dentry);
	if (IS_ERR(fid))
		return PTR_ERR(fid);

582
	/* Write all dirty data */
583 584
	if (S_ISREG(inode->i_mode))
		filemap_write_and_wait(inode->i_mapping);
585

586 587 588
	retval = p9_client_setattr(fid, &p9attr);
	if (retval < 0)
		return retval;
589

590
	if ((iattr->ia_valid & ATTR_SIZE) &&
591 592
	    iattr->ia_size != i_size_read(inode))
		truncate_setsize(inode, iattr->ia_size);
593

594 595 596
	v9fs_invalidate_inode_attr(inode);
	setattr_copy(inode, iattr);
	mark_inode_dirty(inode);
597 598
	if (iattr->ia_valid & ATTR_MODE) {
		/* We also want to update ACL when we update mode bits */
599
		retval = v9fs_acl_chmod(inode, fid);
600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615
		if (retval < 0)
			return retval;
	}
	return 0;
}

/**
 * v9fs_stat2inode_dotl - populate an inode structure with stat info
 * @stat: stat structure
 * @inode: inode to populate
 *
 */

void
v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode)
{
A
Al Viro 已提交
616
	umode_t mode;
617
	struct v9fs_inode *v9inode = V9FS_I(inode);
618 619 620 621 622 623 624 625 626 627

	if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) {
		inode->i_atime.tv_sec = stat->st_atime_sec;
		inode->i_atime.tv_nsec = stat->st_atime_nsec;
		inode->i_mtime.tv_sec = stat->st_mtime_sec;
		inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
		inode->i_ctime.tv_sec = stat->st_ctime_sec;
		inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
		inode->i_uid = stat->st_uid;
		inode->i_gid = stat->st_gid;
M
Miklos Szeredi 已提交
628
		set_nlink(inode, stat->st_nlink);
629

630 631 632
		mode = stat->st_mode & S_IALLUGO;
		mode |= inode->i_mode & ~S_IALLUGO;
		inode->i_mode = mode;
633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653

		i_size_write(inode, stat->st_size);
		inode->i_blocks = stat->st_blocks;
	} else {
		if (stat->st_result_mask & P9_STATS_ATIME) {
			inode->i_atime.tv_sec = stat->st_atime_sec;
			inode->i_atime.tv_nsec = stat->st_atime_nsec;
		}
		if (stat->st_result_mask & P9_STATS_MTIME) {
			inode->i_mtime.tv_sec = stat->st_mtime_sec;
			inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
		}
		if (stat->st_result_mask & P9_STATS_CTIME) {
			inode->i_ctime.tv_sec = stat->st_ctime_sec;
			inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
		}
		if (stat->st_result_mask & P9_STATS_UID)
			inode->i_uid = stat->st_uid;
		if (stat->st_result_mask & P9_STATS_GID)
			inode->i_gid = stat->st_gid;
		if (stat->st_result_mask & P9_STATS_NLINK)
M
Miklos Szeredi 已提交
654
			set_nlink(inode, stat->st_nlink);
655 656 657 658 659 660 661 662 663 664 665 666 667 668 669
		if (stat->st_result_mask & P9_STATS_MODE) {
			inode->i_mode = stat->st_mode;
			if ((S_ISBLK(inode->i_mode)) ||
						(S_ISCHR(inode->i_mode)))
				init_special_inode(inode, inode->i_mode,
								inode->i_rdev);
		}
		if (stat->st_result_mask & P9_STATS_RDEV)
			inode->i_rdev = new_decode_dev(stat->st_rdev);
		if (stat->st_result_mask & P9_STATS_SIZE)
			i_size_write(inode, stat->st_size);
		if (stat->st_result_mask & P9_STATS_BLOCKS)
			inode->i_blocks = stat->st_blocks;
	}
	if (stat->st_result_mask & P9_STATS_GEN)
670
		inode->i_generation = stat->st_gen;
671 672 673 674

	/* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION
	 * because the inode structure does not have fields for them.
	 */
675
	v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
676 677 678 679 680 681 682
}

static int
v9fs_vfs_symlink_dotl(struct inode *dir, struct dentry *dentry,
		const char *symname)
{
	int err;
683
	kgid_t gid;
684 685 686 687 688 689
	char *name;
	struct p9_qid qid;
	struct inode *inode;
	struct p9_fid *dfid;
	struct p9_fid *fid = NULL;
	struct v9fs_session_info *v9ses;
690 691

	name = (char *) dentry->d_name.name;
692
	p9_debug(P9_DEBUG_VFS, "%lu,%s,%s\n", dir->i_ino, name, symname);
693 694 695 696 697
	v9ses = v9fs_inode2v9ses(dir);

	dfid = v9fs_fid_lookup(dentry->d_parent);
	if (IS_ERR(dfid)) {
		err = PTR_ERR(dfid);
698
		p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
699 700 701 702 703 704 705 706 707
		return err;
	}

	gid = v9fs_get_fsgid_for_create(dir);

	/* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */
	err = p9_client_symlink(dfid, name, (char *)symname, gid, &qid);

	if (err < 0) {
708
		p9_debug(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err);
709 710 711
		goto error;
	}

712
	v9fs_invalidate_inode_attr(dir);
713
	if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
714 715 716 717
		/* Now walk from the parent so we can get an unopened fid. */
		fid = p9_client_walk(dfid, 1, &name, 1);
		if (IS_ERR(fid)) {
			err = PTR_ERR(fid);
718 719
			p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
				 err);
720 721 722 723 724
			fid = NULL;
			goto error;
		}

		/* instantiate inode and assign the unopened fid to dentry */
725
		inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
726 727
		if (IS_ERR(inode)) {
			err = PTR_ERR(inode);
728 729
			p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
				 err);
730 731
			goto error;
		}
A
Al Viro 已提交
732
		v9fs_fid_add(dentry, fid);
733
		d_instantiate(dentry, inode);
734
		fid = NULL;
A
Al Viro 已提交
735
		err = 0;
736 737
	} else {
		/* Not in cached mode. No need to populate inode with stat */
738
		inode = v9fs_get_inode(dir->i_sb, S_IFLNK, 0);
739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766
		if (IS_ERR(inode)) {
			err = PTR_ERR(inode);
			goto error;
		}
		d_instantiate(dentry, inode);
	}

error:
	if (fid)
		p9_client_clunk(fid);

	return err;
}

/**
 * v9fs_vfs_link_dotl - create a hardlink for dotl
 * @old_dentry: dentry for file to link to
 * @dir: inode destination for new link
 * @dentry: dentry for link
 *
 */

static int
v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir,
		struct dentry *dentry)
{
	int err;
	struct dentry *dir_dentry;
767 768
	struct p9_fid *dfid, *oldfid;
	struct v9fs_session_info *v9ses;
769

770 771
	p9_debug(P9_DEBUG_VFS, "dir ino: %lu, old_name: %s, new_name: %s\n",
		 dir->i_ino, old_dentry->d_name.name, dentry->d_name.name);
772 773

	v9ses = v9fs_inode2v9ses(dir);
A
Al Viro 已提交
774
	dir_dentry = dentry->d_parent;
775 776 777 778 779 780 781 782 783 784 785
	dfid = v9fs_fid_lookup(dir_dentry);
	if (IS_ERR(dfid))
		return PTR_ERR(dfid);

	oldfid = v9fs_fid_lookup(old_dentry);
	if (IS_ERR(oldfid))
		return PTR_ERR(oldfid);

	err = p9_client_link(dfid, oldfid, (char *)dentry->d_name.name);

	if (err < 0) {
786
		p9_debug(P9_DEBUG_VFS, "p9_client_link failed %d\n", err);
787 788 789
		return err;
	}

790
	v9fs_invalidate_inode_attr(dir);
791 792 793 794 795 796 797
	if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
		/* Get the latest stat info from server. */
		struct p9_fid *fid;
		fid = v9fs_fid_lookup(old_dentry);
		if (IS_ERR(fid))
			return PTR_ERR(fid);

798
		v9fs_refresh_inode_dotl(fid, old_dentry->d_inode);
799
	}
800
	ihold(old_dentry->d_inode);
801 802 803 804 805 806 807 808 809
	d_instantiate(dentry, old_dentry->d_inode);

	return err;
}

/**
 * v9fs_vfs_mknod_dotl - create a special file
 * @dir: inode destination for new link
 * @dentry: dentry for file
F
Fabian Frederick 已提交
810
 * @omode: mode for creation
811 812 813 814
 * @rdev: device associated with special file
 *
 */
static int
A
Al Viro 已提交
815
v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
816 817 818
		dev_t rdev)
{
	int err;
819
	kgid_t gid;
820
	char *name;
A
Al Viro 已提交
821
	umode_t mode;
822 823 824 825 826 827 828
	struct v9fs_session_info *v9ses;
	struct p9_fid *fid = NULL, *dfid = NULL;
	struct inode *inode;
	struct p9_qid qid;
	struct dentry *dir_dentry;
	struct posix_acl *dacl = NULL, *pacl = NULL;

829
	p9_debug(P9_DEBUG_VFS, " %lu,%s mode: %hx MAJOR: %u MINOR: %u\n",
830 831
		 dir->i_ino, dentry->d_name.name, omode,
		 MAJOR(rdev), MINOR(rdev));
832 833 834 835 836

	if (!new_valid_dev(rdev))
		return -EINVAL;

	v9ses = v9fs_inode2v9ses(dir);
A
Al Viro 已提交
837
	dir_dentry = dentry->d_parent;
838 839 840
	dfid = v9fs_fid_lookup(dir_dentry);
	if (IS_ERR(dfid)) {
		err = PTR_ERR(dfid);
841
		p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
842 843 844 845 846 847 848 849 850
		dfid = NULL;
		goto error;
	}

	gid = v9fs_get_fsgid_for_create(dir);
	mode = omode;
	/* Update mode based on ACL value */
	err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
	if (err) {
851 852
		p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mknod %d\n",
			 err);
853 854 855 856 857 858 859 860
		goto error;
	}
	name = (char *) dentry->d_name.name;

	err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid);
	if (err < 0)
		goto error;

861
	v9fs_invalidate_inode_attr(dir);
862 863 864 865 866 867 868 869 870
	fid = p9_client_walk(dfid, 1, &name, 1);
	if (IS_ERR(fid)) {
		err = PTR_ERR(fid);
		p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
			 err);
		fid = NULL;
		goto error;
	}

871 872
	/* instantiate inode and assign the unopened fid to the dentry */
	if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
873
		inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
874 875
		if (IS_ERR(inode)) {
			err = PTR_ERR(inode);
876 877
			p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
				 err);
878 879
			goto error;
		}
880
		v9fs_set_create_acl(inode, fid, dacl, pacl);
A
Al Viro 已提交
881
		v9fs_fid_add(dentry, fid);
882
		d_instantiate(dentry, inode);
883
		fid = NULL;
A
Al Viro 已提交
884
		err = 0;
885 886 887 888 889
	} else {
		/*
		 * Not in cached mode. No need to populate inode with stat.
		 * socket syscall returns a fd, so we need instantiate
		 */
890
		inode = v9fs_get_inode(dir->i_sb, mode, rdev);
891 892 893 894
		if (IS_ERR(inode)) {
			err = PTR_ERR(inode);
			goto error;
		}
895
		v9fs_set_create_acl(inode, fid, dacl, pacl);
896 897 898 899 900
		d_instantiate(dentry, inode);
	}
error:
	if (fid)
		p9_client_clunk(fid);
901
	v9fs_put_acl(dacl, pacl);
902 903 904 905 906 907 908 909 910 911 912 913 914
	return err;
}

/**
 * v9fs_vfs_follow_link_dotl - follow a symlink path
 * @dentry: dentry for symlink
 * @nd: nameidata
 *
 */

static void *
v9fs_vfs_follow_link_dotl(struct dentry *dentry, struct nameidata *nd)
{
M
M. Mohan Kumar 已提交
915 916
	int retval;
	struct p9_fid *fid;
917
	char *link = __getname();
M
M. Mohan Kumar 已提交
918
	char *target;
919

920
	p9_debug(P9_DEBUG_VFS, "%s\n", dentry->d_name.name);
921

M
M. Mohan Kumar 已提交
922
	if (!link) {
923
		link = ERR_PTR(-ENOMEM);
M
M. Mohan Kumar 已提交
924
		goto ndset;
925
	}
M
M. Mohan Kumar 已提交
926 927 928
	fid = v9fs_fid_lookup(dentry);
	if (IS_ERR(fid)) {
		__putname(link);
929
		link = ERR_CAST(fid);
M
M. Mohan Kumar 已提交
930 931 932 933 934 935 936 937 938 939 940
		goto ndset;
	}
	retval = p9_client_readlink(fid, &target);
	if (!retval) {
		strcpy(link, target);
		kfree(target);
		goto ndset;
	}
	__putname(link);
	link = ERR_PTR(retval);
ndset:
941 942 943 944
	nd_set_link(nd, link);
	return NULL;
}

945 946 947 948 949 950 951 952 953 954
int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode)
{
	loff_t i_size;
	struct p9_stat_dotl *st;
	struct v9fs_session_info *v9ses;

	v9ses = v9fs_inode2v9ses(inode);
	st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
	if (IS_ERR(st))
		return PTR_ERR(st);
955 956 957 958 959
	/*
	 * Don't update inode if the file type is different
	 */
	if ((inode->i_mode & S_IFMT) != (st->st_mode & S_IFMT))
		goto out;
960 961 962 963 964 965 966 967

	spin_lock(&inode->i_lock);
	/*
	 * We don't want to refresh inode->i_size,
	 * because we may have cached data
	 */
	i_size = inode->i_size;
	v9fs_stat2inode_dotl(st, inode);
968
	if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
969 970
		inode->i_size = i_size;
	spin_unlock(&inode->i_lock);
971
out:
972 973 974 975
	kfree(st);
	return 0;
}

976 977
const struct inode_operations v9fs_dir_inode_operations_dotl = {
	.create = v9fs_vfs_create_dotl,
978
	.atomic_open = v9fs_vfs_atomic_open_dotl,
979 980 981 982 983 984 985 986 987 988 989 990 991 992
	.lookup = v9fs_vfs_lookup,
	.link = v9fs_vfs_link_dotl,
	.symlink = v9fs_vfs_symlink_dotl,
	.unlink = v9fs_vfs_unlink,
	.mkdir = v9fs_vfs_mkdir_dotl,
	.rmdir = v9fs_vfs_rmdir,
	.mknod = v9fs_vfs_mknod_dotl,
	.rename = v9fs_vfs_rename,
	.getattr = v9fs_vfs_getattr_dotl,
	.setattr = v9fs_vfs_setattr_dotl,
	.setxattr = generic_setxattr,
	.getxattr = generic_getxattr,
	.removexattr = generic_removexattr,
	.listxattr = v9fs_listxattr,
993
	.get_acl = v9fs_iop_get_acl,
994 995 996 997 998 999 1000 1001 1002
};

const struct inode_operations v9fs_file_inode_operations_dotl = {
	.getattr = v9fs_vfs_getattr_dotl,
	.setattr = v9fs_vfs_setattr_dotl,
	.setxattr = generic_setxattr,
	.getxattr = generic_getxattr,
	.removexattr = generic_removexattr,
	.listxattr = v9fs_listxattr,
1003
	.get_acl = v9fs_iop_get_acl,
1004 1005 1006
};

const struct inode_operations v9fs_symlink_inode_operations_dotl = {
M
M. Mohan Kumar 已提交
1007
	.readlink = generic_readlink,
1008 1009 1010 1011 1012 1013 1014 1015 1016
	.follow_link = v9fs_vfs_follow_link_dotl,
	.put_link = v9fs_vfs_put_link,
	.getattr = v9fs_vfs_getattr_dotl,
	.setattr = v9fs_vfs_setattr_dotl,
	.setxattr = generic_setxattr,
	.getxattr = generic_getxattr,
	.removexattr = generic_removexattr,
	.listxattr = v9fs_listxattr,
};