<commit_before>/*
 *  linux/fs/9p/vfs_inode_dotl.c
 *
 * This file contains vfs inode ops for the 9P2000.L protocol.
 *
 *  Copyright (C) 2004 by <NAME> <<EMAIL>>
 *  Copyright (C) 2002 by <NAME> <<EMAIL>>
 *
 *  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
v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, int omode,
		    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.
 */

static gid_t v9fs_get_fsgid_for_create(struct inode *dir_inode)
{
	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();
}

/**
 * v9fs_dentry_from_dir_inode - helper function to get the dentry from
 * dir inode.
 *
 */

static struct dentry *v9fs_dentry_from_dir_inode(struct inode *inode)
{
	struct dentry *dentry;

	spin_lock(&inode->i_lock);
	/* Directory should have only one entry. */
	BUG_ON(S_ISDIR(inode->i_mode) && !list_is_singular(&inode->i_dentry));
	dentry = list_entry(inode->i_dentry.next, struct dentry, d_alias);
	spin_unlock(&inode->i_lock);
	return dentry;
}

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

	i_ino = v9fs_qid2ino(qid);
	inode = iget_locked(sb, i_ino);
	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.
	 */
	retval = v9fs_init_inode(v9ses, inode, st->st_mode);
	if (retval)
		goto error;

	v9fs_stat2inode_dotl(st, inode);
#ifdef CONFIG_9P_FSCACHE
	v9fs_fscache_set_key(inode, &st->qid);
	v9fs_cache_inode_get_cookie(inode);
#endif
	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);

}

struct inode *
v9fs_inode_from_fid_dotl(struct v9fs_session_info *v9ses, struct p9_fid *fid,
			 struct super_block *sb)
{
	struct p9_stat_dotl *st;
	struct inode *inode = NULL;

	st = p9_client_getattr_dotl(fid, P9_STATS_BASIC);
	if (IS_ERR(st))
		return ERR_CAST(st);

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

/**
 * 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
 * @mode: create permissions
 * @nd: path information
 *
 */

static int
v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, int omode,
		struct nameidata *nd)
{
	int err = 0;
	gid_t gid;
	int flags;
	mode_t mode;
	char *name = NULL;
	struct file *filp;
	struct p9_qid qid;
	struct inode *inode;
	struct p9_fid *fid = NULL;
	struct v9fs_inode *v9inode;
	struct p9_fid *dfid, *ofid, *inode_fid;
	struct v9fs_session_info *v9ses;
	struct posix_acl *pacl = NULL, *dacl = NULL;

	v9ses = v9fs_inode2v9ses(dir);
	if (nd && nd->flags & LOOKUP_OPEN)
		flags = nd->intent.open.flags - 1;
	else {
		/*
		 * create call without LOOKUP_OPEN is due
		 * to mknod of regular files. So use mknod
		 * operation.
		 */
		return v9fs_vfs_mknod_dotl(dir, dentry, omode, 0);
	}

	name = (char *) dentry->d_name.name;
	P9_DPRINTK(P9_DEBUG_VFS, "v9fs_vfs_create_dotl: name:%s flags:0x%x "
			"mode:0x%x\n", name, flags, omode);

	dfid = v9fs_fid_lookup(dentry->d_parent);
	if (IS_ERR(dfid)) {
		err = PTR_ERR(dfid);
		P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
		return err;
	}

	/* clone a fid to use for creation */
	ofid = p9_client_walk(dfid, 0, NULL, 1);
	if (IS_ERR(ofid)) {
		err = PTR_ERR(ofid);
		P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
		return err;
	}

	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) {
		P9_DPRINTK(P9_DEBUG_VFS,
			   "Failed to get acl values in creat %d\n", err);
		goto error;
	}
	err = p9_client_create_dotl(ofid, name, flags, mode, gid, &qid);
	if (err < 0) {
		P9_DPRINTK(P9_DEBUG_VFS,
				"p9_client_open_dotl failed in creat %d\n",
				err);
		goto error;
	}
	v9fs_invalidate_inode_attr(dir);

	/* 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);
		P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
		fid = NULL;
		goto error;
	}
	inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb);
	if (IS_ERR(inode)) {
		err = PTR_ERR(inode);
		P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", err);
		goto error;
	}
	d_instantiate(dentry, inode);
	err = v9fs_fid_add(dentry, fid);
	if (err < 0)
		goto error;

	/* Now set the ACL based on the default value */
	v9fs_set_create_acl(dentry, dacl, pacl);

	v9inode = V9FS_I(inode);
	mutex_lock(&v9inode->v_mutex);
	if (v9ses->cache && !v9inode->writeback_fid &&
	    ((flags & O_ACCMODE) != O_RDONLY)) {
		/*
		 * clone a fid and add it to writeback_fid
		 * 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);
			mutex_unlock(&v9inode->v_mutex);
			goto error;
		}
		v9inode->writeback_fid = (void *) inode_fid;
	}
	mutex_unlock(&v9inode->v_mutex);
	/* Since we are opening a file, assign the open fid to the file */
	filp = lookup_instantiate_filp(nd, dentry, generic_file_open);
	if (IS_ERR(filp)) {
		p9_client_clunk(ofid);
		return PTR_ERR(filp);
	}
	filp->private_data = ofid;
#ifdef CONFIG_9P_FSCACHE
	if (v9ses->cache)
		v9fs_cache_inode_set_cookie(inode, filp);
#endif
	return 0;

error:
	if (ofid)
		p9_client_clunk(ofid);
	if (fid)
		p9_client_clunk(fid);
	return err;
}

/**
 * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory
 * @dir:  inode that is being unlinked
 * @dentry: dentry that is being unlinked
 * @mode: mode for new directory
 *
 */
<commit_msg>fs/9p: Don't clunk dentry fid when we fail to get a writeback inode<commit_after>/*
 *  linux/fs/9p/vfs_inode_dotl.c
 *
 * This file contains vfs inode ops for the 9P2000.L protocol.
 *
 *  Copyright (C) 2004 by <NAME> <<EMAIL>>
 *  Copyright (C) 2002 by <NAME> <<EMAIL>>
 *
 *  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
v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, int omode,
		    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.
 */

static gid_t v9fs_get_fsgid_for_create(struct inode *dir_inode)
{
	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();
}

/**
 * v9fs_dentry_from_dir_inode - helper function to get the dentry from
 * dir inode.
 *
 */

static struct dentry *v9fs_dentry_from_dir_inode(struct inode *inode)
{
	struct dentry *dentry;

	spin_lock(&inode->i_lock);
	/* Directory should have only one entry. */
	BUG_ON(S_ISDIR(inode->i_mode) && !list_is_singular(&inode->i_dentry));
	dentry = list_entry(inode->i_dentry.next, struct dentry, d_alias);
	spin_unlock(&inode->i_lock);
	return dentry;
}

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

	i_ino = v9fs_qid2ino(qid);
	inode = iget_locked(sb, i_ino);
	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.
	 */
	retval = v9fs_init_inode(v9ses, inode, st->st_mode);
	if (retval)
		goto error;

	v9fs_stat2inode_dotl(st, inode);
#ifdef CONFIG_9P_FSCACHE
	v9fs_fscache_set_key(inode, &st->qid);
	v9fs_cache_inode_get_cookie(inode);
#endif
	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);

}

struct inode *
v9fs_inode_from_fid_dotl(struct v9fs_session_info *v9ses, struct p9_fid *fid,
			 struct super_block *sb)
{
	struct p9_stat_dotl *st;
	struct inode *inode = NULL;

	st = p9_client_getattr_dotl(fid, P9_STATS_BASIC);
	if (IS_ERR(st))
		return ERR_CAST(st);

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

/**
 * 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
 * @mode: create permissions
 * @nd: path information
 *
 */

static int
v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, int omode,
		struct nameidata *nd)
{
	int err = 0;
	gid_t gid;
	int flags;
	mode_t mode;
	char *name = NULL;
	struct file *filp;
	struct p9_qid qid;
	struct inode *inode;
	struct p9_fid *fid = NULL;
	struct v9fs_inode *v9inode;
	struct p9_fid *dfid, *ofid, *inode_fid;
	struct v9fs_session_info *v9ses;
	struct posix_acl *pacl = NULL, *dacl = NULL;

	v9ses = v9fs_inode2v9ses(dir);
	if (nd && nd->flags & LOOKUP_OPEN)
		flags = nd->intent.open.flags - 1;
	else {
		/*
		 * create call without LOOKUP_OPEN is due
		 * to mknod of regular files. So use mknod
		 * operation.
		 */
		return v9fs_vfs_mknod_dotl(dir, dentry, omode, 0);
	}

	name = (char *) dentry->d_name.name;
	P9_DPRINTK(P9_DEBUG_VFS, "v9fs_vfs_create_dotl: name:%s flags:0x%x "
			"mode:0x%x\n", name, flags, omode);

	dfid = v9fs_fid_lookup(dentry->d_parent);
	if (IS_ERR(dfid)) {
		err = PTR_ERR(dfid);
		P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
		return err;
	}

	/* clone a fid to use for creation */
	ofid = p9_client_walk(dfid, 0, NULL, 1);
	if (IS_ERR(ofid)) {
		err = PTR_ERR(ofid);
		P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
		return err;
	}

	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) {
		P9_DPRINTK(P9_DEBUG_VFS,
			   "Failed to get acl values in creat %d\n", err);
		goto error;
	}
	err = p9_client_create_dotl(ofid, name, flags, mode, gid, &qid);
	if (err < 0) {
		P9_DPRINTK(P9_DEBUG_VFS,
				"p9_client_open_dotl failed in creat %d\n",
				err);
		goto error;
	}
	v9fs_invalidate_inode_attr(dir);

	/* 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);
		P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
		fid = NULL;
		goto error;
	}
	inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb);
	if (IS_ERR(inode)) {
		err = PTR_ERR(inode);
		P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", err);
		goto error;
	}
	d_instantiate(dentry, inode);
	err = v9fs_fid_add(dentry, fid);
	if (err < 0)
		goto error;

	/* Now set the ACL based on the default value */
	v9fs_set_create_acl(dentry, dacl, pacl);

	v9inode = V9FS_I(inode);
	mutex_lock(&v9inode->v_mutex);
	if (v9ses->cache && !v9inode->writeback_fid &&
	    ((flags & O_ACCMODE) != O_RDONLY)) {
		/*
		 * clone a fid and add it to writeback_fid
		 * 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);
			mutex_unlock(&v9inode->v_mutex);
			goto err_clunk_old_fid;
		}
		v9inode->writeback_fid = (void *) inode_fid;
	}
	mutex_unlock(&v9inode->v_mutex);
	/* Since we are opening a file, assign the open fid to the file */
	filp = lookup_instantiate_filp(nd, dentry, generic_file_open);
	if (IS_ERR(filp)) {
		err = PTR_ERR(filp);
		goto err_clunk_old_fid;
	}
	filp->private_data = ofid;
#ifdef CONFIG_9P_FSCACHE
	if (v9ses->cache)
		v9fs_cache_inode_set_cookie(inode, filp);
#endif
	return 0;

error:
	if (fid)
		p9_client_clunk(fid);
err_clunk_old_fid:
	if (ofid)
		p9_client_clunk(ofid);
	return err;
}

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

{'fraction_non_alphanumeric': 0.12014489836989334, 'fraction_numerical': 0.018246461393975986, 'mean_word_length': 4.110730202262599, 'pattern_counts': {'":': 0, '<': 51, '<?xml version=': 0, '>': 97, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
{'dir': 'git-commits-cleaned', 'id': '5734264', 'n_tokens_mistral': 6364, 'n_tokens_neox': 6091, 'n_words': 1572}