[linux.git] / fs / cifs / dir.c

/*
 *   fs/cifs/dir.c
 *
 *   vfs operations that deal with dentries
 *
 *   Copyright (C) International Business Machines  Corp., 2002,2008
 *   Author(s): Steve French ([email protected])
 *
 *   This library is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU Lesser General Public License as published
 *   by the Free Software Foundation; either version 2.1 of the License, or
 *   (at your option) any later version.
 *
 *   This library 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 Lesser General Public License for more details.
 *
 *   You should have received a copy of the GNU Lesser General Public License
 *   along with this library; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
#include <linux/fs.h>
#include <linux/stat.h>
#include <linux/slab.h>
#include <linux/namei.h>
#include "cifsfs.h"
#include "cifspdu.h"
#include "cifsglob.h"
#include "cifsproto.h"
#include "cifs_debug.h"
#include "cifs_fs_sb.h"

static void
renew_parental_timestamps(struct dentry *direntry)
{
	/* BB check if there is a way to get the kernel to do this or if we
	   really need this */
	do {
		direntry->d_time = jiffies;
		direntry = direntry->d_parent;
	} while (!IS_ROOT(direntry));
}

/* Note: caller must free return buffer */
char *
build_path_from_dentry(struct dentry *direntry)
{
	struct dentry *temp;
	int namelen;
	int pplen;
	int dfsplen;
	char *full_path;
	char dirsep;
	struct cifs_sb_info *cifs_sb;

	if (direntry == NULL)
		return NULL;  /* not much we can do if dentry is freed and
		we need to reopen the file after it was closed implicitly
		when the server crashed */

	cifs_sb = CIFS_SB(direntry->d_sb);
	dirsep = CIFS_DIR_SEP(cifs_sb);
	pplen = cifs_sb->prepathlen;
	if (cifs_sb->tcon && (cifs_sb->tcon->Flags & SMB_SHARE_IS_IN_DFS))
		dfsplen = strnlen(cifs_sb->tcon->treeName, MAX_TREE_SIZE + 1);
	else
		dfsplen = 0;
cifs_bp_rename_retry:
	namelen = pplen + dfsplen;
	for (temp = direntry; !IS_ROOT(temp);) {
		namelen += (1 + temp->d_name.len);
		temp = temp->d_parent;
		if (temp == NULL) {
			cERROR(1, ("corrupt dentry"));
			return NULL;
		}
	}

	full_path = kmalloc(namelen+1, GFP_KERNEL);
	if (full_path == NULL)
		return full_path;
	full_path[namelen] = 0;	/* trailing null */
	for (temp = direntry; !IS_ROOT(temp);) {
		namelen -= 1 + temp->d_name.len;
		if (namelen < 0) {
			break;
		} else {
			full_path[namelen] = dirsep;
			strncpy(full_path + namelen + 1, temp->d_name.name,
				temp->d_name.len);
			cFYI(0, ("name: %s", full_path + namelen));
		}
		temp = temp->d_parent;
		if (temp == NULL) {
			cERROR(1, ("corrupt dentry"));
			kfree(full_path);
			return NULL;
		}
	}
	if (namelen != pplen + dfsplen) {
		cERROR(1,
		       ("did not end path lookup where expected namelen is %d",
			namelen));
		/* presumably this is only possible if racing with a rename
		of one of the parent directories  (we can not lock the dentries
		above us to prevent this, but retrying should be harmless) */
		kfree(full_path);
		goto cifs_bp_rename_retry;
	}
	/* DIR_SEP already set for byte  0 / vs \ but not for
	   subsequent slashes in prepath which currently must
	   be entered the right way - not sure if there is an alternative
	   since the '\' is a valid posix character so we can not switch
	   those safely to '/' if any are found in the middle of the prepath */
	/* BB test paths to Windows with '/' in the midst of prepath */

	if (dfsplen) {
		strncpy(full_path, cifs_sb->tcon->treeName, dfsplen);
		if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) {
			int i;
			for (i = 0; i < dfsplen; i++) {
				if (full_path[i] == '\\')
					full_path[i] = '/';
			}
		}
	}
	strncpy(full_path + dfsplen, CIFS_SB(direntry->d_sb)->prepath, pplen);
	return full_path;
}

/* Inode operations in similar order to how they appear in Linux file fs.h */

int
cifs_create(struct inode *inode, struct dentry *direntry, int mode,
		struct nameidata *nd)
{
	int rc = -ENOENT;
	int xid;
	int create_options = CREATE_NOT_DIR;
	int oplock = 0;
	int desiredAccess = GENERIC_READ | GENERIC_WRITE;
	__u16 fileHandle;
	struct cifs_sb_info *cifs_sb;
	struct cifsTconInfo *pTcon;
	char *full_path = NULL;
	FILE_ALL_INFO *buf = NULL;
	struct inode *newinode = NULL;
	struct cifsFileInfo *pCifsFile = NULL;
	struct cifsInodeInfo *pCifsInode;
	int disposition = FILE_OVERWRITE_IF;
	bool write_only = false;

	xid = GetXid();

	cifs_sb = CIFS_SB(inode->i_sb);
	pTcon = cifs_sb->tcon;

	full_path = build_path_from_dentry(direntry);
	if (full_path == NULL) {
		FreeXid(xid);
		return -ENOMEM;
	}

	if (nd && (nd->flags & LOOKUP_OPEN)) {
		int oflags = nd->intent.open.flags;

		desiredAccess = 0;
		if (oflags & FMODE_READ)
			desiredAccess |= GENERIC_READ;
		if (oflags & FMODE_WRITE) {
			desiredAccess |= GENERIC_WRITE;
			if (!(oflags & FMODE_READ))
				write_only = true;
		}

		if ((oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
			disposition = FILE_CREATE;
		else if ((oflags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC))
			disposition = FILE_OVERWRITE_IF;
		else if ((oflags & O_CREAT) == O_CREAT)
			disposition = FILE_OPEN_IF;
		else
			cFYI(1, ("Create flag not set in create function"));
	}

	/* BB add processing to set equivalent of mode - e.g. via CreateX with
	   ACLs */
	if (oplockEnabled)
		oplock = REQ_OPLOCK;

	buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
	if (buf == NULL) {
		kfree(full_path);
		FreeXid(xid);
		return -ENOMEM;
	}

	mode &= ~current->fs->umask;

	/*
	 * if we're not using unix extensions, see if we need to set
	 * ATTR_READONLY on the create call
	 */
	if (!pTcon->unix_ext && (mode & S_IWUGO) == 0)
		create_options |= CREATE_OPTION_READONLY;

	if (cifs_sb->tcon->ses->capabilities & CAP_NT_SMBS)
		rc = CIFSSMBOpen(xid, pTcon, full_path, disposition,
			 desiredAccess, create_options,
			 &fileHandle, &oplock, buf, cifs_sb->local_nls,
			 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
	else
		rc = -EIO; /* no NT SMB support fall into legacy open below */

	if (rc == -EIO) {
		/* old server, retry the open legacy style */
		rc = SMBLegacyOpen(xid, pTcon, full_path, disposition,
			desiredAccess, create_options,
			&fileHandle, &oplock, buf, cifs_sb->local_nls,
			cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
	}
	if (rc) {
		cFYI(1, ("cifs_create returned 0x%x", rc));
	} else {
		/* If Open reported that we actually created a file
		then we now have to set the mode if possible */
		if ((pTcon->unix_ext) && (oplock & CIFS_CREATE_ACTION)) {
			if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
				CIFSSMBUnixSetPerms(xid, pTcon, full_path, mode,
					(__u64)current->fsuid,
					(__u64)current->fsgid,
					0 /* dev */,
					cifs_sb->local_nls,
					cifs_sb->mnt_cifs_flags &
						CIFS_MOUNT_MAP_SPECIAL_CHR);
			} else {
				CIFSSMBUnixSetPerms(xid, pTcon, full_path, mode,
					(__u64)-1,
					(__u64)-1,
					0 /* dev */,
					cifs_sb->local_nls,
					cifs_sb->mnt_cifs_flags &
						CIFS_MOUNT_MAP_SPECIAL_CHR);
			}
		} else {
			/* BB implement mode setting via Windows security
			   descriptors e.g. */
			/* CIFSSMBWinSetPerms(xid,pTcon,path,mode,-1,-1,nls);*/

			/* Could set r/o dos attribute if mode & 0222 == 0 */
		}

		/* server might mask mode so we have to query for it */
		if (pTcon->unix_ext)
			rc = cifs_get_inode_info_unix(&newinode, full_path,
						 inode->i_sb, xid);
		else {
			rc = cifs_get_inode_info(&newinode, full_path,
						 buf, inode->i_sb, xid,
						 &fileHandle);
			if (newinode) {
				newinode->i_mode = mode;
				if ((oplock & CIFS_CREATE_ACTION) &&
				    (cifs_sb->mnt_cifs_flags &
				     CIFS_MOUNT_SET_UID)) {
					newinode->i_uid = current->fsuid;
					newinode->i_gid = current->fsgid;
				}
			}
		}

		if (rc != 0) {
			cFYI(1,
			     ("Create worked but get_inode_info failed rc = %d",
			      rc));
		} else {
			if (pTcon->nocase)
				direntry->d_op = &cifs_ci_dentry_ops;
			else
				direntry->d_op = &cifs_dentry_ops;
			d_instantiate(direntry, newinode);
		}
		if ((nd == NULL /* nfsd case - nfs srv does not set nd */) ||
			(!(nd->flags & LOOKUP_OPEN))) {
			/* mknod case - do not leave file open */
			CIFSSMBClose(xid, pTcon, fileHandle);
		} else if (newinode) {
			pCifsFile =
			   kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL);

			if (pCifsFile == NULL)
				goto cifs_create_out;
			pCifsFile->netfid = fileHandle;
			pCifsFile->pid = current->tgid;
			pCifsFile->pInode = newinode;
			pCifsFile->invalidHandle = false;
			pCifsFile->closePend     = false;
			init_MUTEX(&pCifsFile->fh_sem);
			mutex_init(&pCifsFile->lock_mutex);
			INIT_LIST_HEAD(&pCifsFile->llist);
			atomic_set(&pCifsFile->wrtPending, 0);

			/* set the following in open now
				pCifsFile->pfile = file; */
			write_lock(&GlobalSMBSeslock);
			list_add(&pCifsFile->tlist, &pTcon->openFileList);
			pCifsInode = CIFS_I(newinode);
			if (pCifsInode) {
				/* if readable file instance put first in list*/
				if (write_only) {
					list_add_tail(&pCifsFile->flist,
						&pCifsInode->openFileList);
				} else {
					list_add(&pCifsFile->flist,
						&pCifsInode->openFileList);
				}
				if ((oplock & 0xF) == OPLOCK_EXCLUSIVE) {
					pCifsInode->clientCanCacheAll = true;
					pCifsInode->clientCanCacheRead = true;
					cFYI(1, ("Exclusive Oplock inode %p",
						newinode));
				} else if ((oplock & 0xF) == OPLOCK_READ)
					pCifsInode->clientCanCacheRead = true;
			}
			write_unlock(&GlobalSMBSeslock);
		}
	}
cifs_create_out:
	kfree(buf);
	kfree(full_path);
	FreeXid(xid);
	return rc;
}

int cifs_mknod(struct inode *inode, struct dentry *direntry, int mode,
		dev_t device_number)
{
	int rc = -EPERM;
	int xid;
	struct cifs_sb_info *cifs_sb;
	struct cifsTconInfo *pTcon;
	char *full_path = NULL;
	struct inode *newinode = NULL;

	if (!old_valid_dev(device_number))
		return -EINVAL;

	xid = GetXid();

	cifs_sb = CIFS_SB(inode->i_sb);
	pTcon = cifs_sb->tcon;

	full_path = build_path_from_dentry(direntry);
	if (full_path == NULL)
		rc = -ENOMEM;
	else if (pTcon->unix_ext) {
		mode &= ~current->fs->umask;
		if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
			rc = CIFSSMBUnixSetPerms(xid, pTcon, full_path,
				mode, (__u64)current->fsuid,
				(__u64)current->fsgid,
				device_number, cifs_sb->local_nls,
				cifs_sb->mnt_cifs_flags &
					CIFS_MOUNT_MAP_SPECIAL_CHR);
		} else {
			rc = CIFSSMBUnixSetPerms(xid, pTcon,
				full_path, mode, (__u64)-1, (__u64)-1,
				device_number, cifs_sb->local_nls,
				cifs_sb->mnt_cifs_flags &
					CIFS_MOUNT_MAP_SPECIAL_CHR);
		}

		if (!rc) {
			rc = cifs_get_inode_info_unix(&newinode, full_path,
						inode->i_sb, xid);
			if (pTcon->nocase)
				direntry->d_op = &cifs_ci_dentry_ops;
			else
				direntry->d_op = &cifs_dentry_ops;
			if (rc == 0)
				d_instantiate(direntry, newinode);
		}
	} else {
		if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
			int oplock = 0;
			u16 fileHandle;
			FILE_ALL_INFO *buf;

			cFYI(1, ("sfu compat create special file"));

			buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
			if (buf == NULL) {
				kfree(full_path);
				FreeXid(xid);
				return -ENOMEM;
			}

			rc = CIFSSMBOpen(xid, pTcon, full_path,
					 FILE_CREATE, /* fail if exists */
					 GENERIC_WRITE /* BB would
					  WRITE_OWNER | WRITE_DAC be better? */,
					 /* Create a file and set the
					    file attribute to SYSTEM */
					 CREATE_NOT_DIR | CREATE_OPTION_SPECIAL,
					 &fileHandle, &oplock, buf,
					 cifs_sb->local_nls,
					 cifs_sb->mnt_cifs_flags &
					    CIFS_MOUNT_MAP_SPECIAL_CHR);

			/* BB FIXME - add handling for backlevel servers
			   which need legacy open and check for all
			   calls to SMBOpen for fallback to SMBLeagcyOpen */
			if (!rc) {
				/* BB Do not bother to decode buf since no
				   local inode yet to put timestamps in,
				   but we can reuse it safely */
				unsigned int bytes_written;
				struct win_dev *pdev;
				pdev = (struct win_dev *)buf;
				if (S_ISCHR(mode)) {
					memcpy(pdev->type, "IntxCHR", 8);
					pdev->major =
					      cpu_to_le64(MAJOR(device_number));
					pdev->minor =
					      cpu_to_le64(MINOR(device_number));
					rc = CIFSSMBWrite(xid, pTcon,
						fileHandle,
						sizeof(struct win_dev),
						0, &bytes_written, (char *)pdev,
						NULL, 0);
				} else if (S_ISBLK(mode)) {
					memcpy(pdev->type, "IntxBLK", 8);
					pdev->major =
					      cpu_to_le64(MAJOR(device_number));
					pdev->minor =
					      cpu_to_le64(MINOR(device_number));
					rc = CIFSSMBWrite(xid, pTcon,
						fileHandle,
						sizeof(struct win_dev),
						0, &bytes_written, (char *)pdev,
						NULL, 0);
				} /* else if(S_ISFIFO */
				CIFSSMBClose(xid, pTcon, fileHandle);
				d_drop(direntry);
			}
			kfree(buf);
			/* add code here to set EAs */
		}
	}

	kfree(full_path);
	FreeXid(xid);
	return rc;
}


struct dentry *
cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
	    struct nameidata *nd)
{
	int xid;
	int rc = 0; /* to get around spurious gcc warning, set to zero here */
	struct cifs_sb_info *cifs_sb;
	struct cifsTconInfo *pTcon;
	struct inode *newInode = NULL;
	char *full_path = NULL;

	xid = GetXid();

	cFYI(1, (" parent inode = 0x%p name is: %s and dentry = 0x%p",
	      parent_dir_inode, direntry->d_name.name, direntry));

	/* check whether path exists */

	cifs_sb = CIFS_SB(parent_dir_inode->i_sb);
	pTcon = cifs_sb->tcon;

	/*
	 * Don't allow the separator character in a path component.
	 * The VFS will not allow "/", but "\" is allowed by posix.
	 */
	if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)) {
		int i;
		for (i = 0; i < direntry->d_name.len; i++)
			if (direntry->d_name.name[i] == '\\') {
				cFYI(1, ("Invalid file name"));
				FreeXid(xid);
				return ERR_PTR(-EINVAL);
			}
	}

	/* can not grab the rename sem here since it would
	deadlock in the cases (beginning of sys_rename itself)
	in which we already have the sb rename sem */
	full_path = build_path_from_dentry(direntry);
	if (full_path == NULL) {
		FreeXid(xid);
		return ERR_PTR(-ENOMEM);
	}

	if (direntry->d_inode != NULL) {
		cFYI(1, (" non-NULL inode in lookup"));
	} else {
		cFYI(1, (" NULL inode in lookup"));
	}
	cFYI(1,
	     (" Full path: %s inode = 0x%p", full_path, direntry->d_inode));

	if (pTcon->unix_ext)
		rc = cifs_get_inode_info_unix(&newInode, full_path,
					      parent_dir_inode->i_sb, xid);
	else
		rc = cifs_get_inode_info(&newInode, full_path, NULL,
					 parent_dir_inode->i_sb, xid, NULL);

	if ((rc == 0) && (newInode != NULL)) {
		if (pTcon->nocase)
			direntry->d_op = &cifs_ci_dentry_ops;
		else
			direntry->d_op = &cifs_dentry_ops;
		d_add(direntry, newInode);

		/* since paths are not looked up by component - the parent
		   directories are presumed to be good here */
		renew_parental_timestamps(direntry);

	} else if (rc == -ENOENT) {
		rc = 0;
		direntry->d_time = jiffies;
		if (pTcon->nocase)
			direntry->d_op = &cifs_ci_dentry_ops;
		else
			direntry->d_op = &cifs_dentry_ops;
		d_add(direntry, NULL);
	/*	if it was once a directory (but how can we tell?) we could do
		shrink_dcache_parent(direntry); */
	} else if (rc != -EACCES) {
		cERROR(1, ("Unexpected lookup error %d", rc));
		/* We special case check for Access Denied - since that
		is a common return code */
	}

	kfree(full_path);
	FreeXid(xid);
	return ERR_PTR(rc);
}

static int
cifs_d_revalidate(struct dentry *direntry, struct nameidata *nd)
{
	int isValid = 1;

	if (direntry->d_inode) {
		if (cifs_revalidate(direntry))
			return 0;
	} else {
		cFYI(1, ("neg dentry 0x%p name = %s",
			 direntry, direntry->d_name.name));
		if (time_after(jiffies, direntry->d_time + HZ) ||
			!lookupCacheEnabled) {
			d_drop(direntry);
			isValid = 0;
		}
	}

	return isValid;
}

/* static int cifs_d_delete(struct dentry *direntry)
{
	int rc = 0;

	cFYI(1, ("In cifs d_delete, name = %s", direntry->d_name.name));

	return rc;
}     */

struct dentry_operations cifs_dentry_ops = {
	.d_revalidate = cifs_d_revalidate,
/* d_delete:       cifs_d_delete,      */ /* not needed except for debugging */
};

static int cifs_ci_hash(struct dentry *dentry, struct qstr *q)
{
	struct nls_table *codepage = CIFS_SB(dentry->d_inode->i_sb)->local_nls;
	unsigned long hash;
	int i;

	hash = init_name_hash();
	for (i = 0; i < q->len; i++)
		hash = partial_name_hash(nls_tolower(codepage, q->name[i]),
					 hash);
	q->hash = end_name_hash(hash);

	return 0;
}

static int cifs_ci_compare(struct dentry *dentry, struct qstr *a,
			   struct qstr *b)
{
	struct nls_table *codepage = CIFS_SB(dentry->d_inode->i_sb)->local_nls;

	if ((a->len == b->len) &&
	    (nls_strnicmp(codepage, a->name, b->name, a->len) == 0)) {
		/*
		 * To preserve case, don't let an existing negative dentry's
		 * case take precedence.  If a is not a negative dentry, this
		 * should have no side effects
		 */
		memcpy((void *)a->name, b->name, a->len);
		return 0;
	}
	return 1;
}

struct dentry_operations cifs_ci_dentry_ops = {
	.d_revalidate = cifs_d_revalidate,
	.d_hash = cifs_ci_hash,
	.d_compare = cifs_ci_compare,
};
Commit	Line	Data
1da177e4 LT	1	/*
	2	* fs/cifs/dir.c
	3	*
	4	* vfs operations that deal with dentries
5fdae1f6	5	*
ad7a2926	6	* Copyright (C) International Business Machines Corp., 2002,2008
1da177e4 LT	7	* Author(s): Steve French ([email protected])
	8	*
	9	* This library is free software; you can redistribute it and/or modify
	10	* it under the terms of the GNU Lesser General Public License as published
	11	* by the Free Software Foundation; either version 2.1 of the License, or
	12	* (at your option) any later version.
	13	*
	14	* This library is distributed in the hope that it will be useful,
	15	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	16	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
	17	* the GNU Lesser General Public License for more details.
	18	*
	19	* You should have received a copy of the GNU Lesser General Public License
	20	* along with this library; if not, write to the Free Software
	21	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	22	*/
	23	#include <linux/fs.h>
	24	#include <linux/stat.h>
	25	#include <linux/slab.h>
	26	#include <linux/namei.h>
	27	#include "cifsfs.h"
	28	#include "cifspdu.h"
	29	#include "cifsglob.h"
	30	#include "cifsproto.h"
	31	#include "cifs_debug.h"
	32	#include "cifs_fs_sb.h"
	33
99ee4dbd	34	static void
1da177e4 LT	35	renew_parental_timestamps(struct dentry *direntry)
1da177e4 LT	36	{
5fdae1f6 SF	37	/* BB check if there is a way to get the kernel to do this or if we
5fdae1f6 SF	38	really need this */
1da177e4 LT	39	do {
	40	direntry->d_time = jiffies;
	41	direntry = direntry->d_parent;
5fdae1f6	42	} while (!IS_ROOT(direntry));
1da177e4 LT	43	}
	44
	45	/* Note: caller must free return buffer */
	46	char *
	47	build_path_from_dentry(struct dentry *direntry)
	48	{
	49	struct dentry *temp;
2fe87f02 SF	50	int namelen;
2fe87f02 SF	51	int pplen;
646dd539	52	int dfsplen;
1da177e4	53	char *full_path;
88274815	54	char dirsep;
646dd539	55	struct cifs_sb_info *cifs_sb;
1da177e4	56
5fdae1f6	57	if (direntry == NULL)
1da177e4 LT	58	return NULL; /* not much we can do if dentry is freed and
	59	we need to reopen the file after it was closed implicitly
	60	when the server crashed */
	61
646dd539 SF	62	cifs_sb = CIFS_SB(direntry->d_sb);
	63	dirsep = CIFS_DIR_SEP(cifs_sb);
	64	pplen = cifs_sb->prepathlen;
	65	if (cifs_sb->tcon && (cifs_sb->tcon->Flags & SMB_SHARE_IS_IN_DFS))
	66	dfsplen = strnlen(cifs_sb->tcon->treeName, MAX_TREE_SIZE + 1);
	67	else
	68	dfsplen = 0;
1da177e4	69	cifs_bp_rename_retry:
646dd539	70	namelen = pplen + dfsplen;
1da177e4 LT	71	for (temp = direntry; !IS_ROOT(temp);) {
	72	namelen += (1 + temp->d_name.len);
	73	temp = temp->d_parent;
5fdae1f6 SF	74	if (temp == NULL) {
5fdae1f6 SF	75	cERROR(1, ("corrupt dentry"));
1da177e4 LT	76	return NULL;
	77	}
	78	}
	79
	80	full_path = kmalloc(namelen+1, GFP_KERNEL);
5fdae1f6	81	if (full_path == NULL)
1da177e4 LT	82	return full_path;
1da177e4 LT	83	full_path[namelen] = 0; /* trailing null */
1da177e4 LT	84	for (temp = direntry; !IS_ROOT(temp);) {
	85	namelen -= 1 + temp->d_name.len;
	86	if (namelen < 0) {
	87	break;
	88	} else {
7f57356b	89	full_path[namelen] = dirsep;
1da177e4 LT	90	strncpy(full_path + namelen + 1, temp->d_name.name,
1da177e4 LT	91	temp->d_name.len);
2fe87f02	92	cFYI(0, ("name: %s", full_path + namelen));
1da177e4 LT	93	}
1da177e4 LT	94	temp = temp->d_parent;
5fdae1f6 SF	95	if (temp == NULL) {
5fdae1f6 SF	96	cERROR(1, ("corrupt dentry"));
1da177e4 LT	97	kfree(full_path);
	98	return NULL;
	99	}
	100	}
646dd539	101	if (namelen != pplen + dfsplen) {
1da177e4	102	cERROR(1,
2fe87f02	103	("did not end path lookup where expected namelen is %d",
1da177e4	104	namelen));
5fdae1f6	105	/* presumably this is only possible if racing with a rename
1da177e4 LT	106	of one of the parent directories (we can not lock the dentries
	107	above us to prevent this, but retrying should be harmless) */
	108	kfree(full_path);
1da177e4 LT	109	goto cifs_bp_rename_retry;
1da177e4 LT	110	}
2fe87f02 SF	111	/* DIR_SEP already set for byte 0 / vs \ but not for
	112	subsequent slashes in prepath which currently must
	113	be entered the right way - not sure if there is an alternative
	114	since the '\' is a valid posix character so we can not switch
	115	those safely to '/' if any are found in the middle of the prepath */
	116	/* BB test paths to Windows with '/' in the midst of prepath */
646dd539 SF	117
	118	if (dfsplen) {
	119	strncpy(full_path, cifs_sb->tcon->treeName, dfsplen);
	120	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) {
	121	int i;
	122	for (i = 0; i < dfsplen; i++) {
	123	if (full_path[i] == '\\')
	124	full_path[i] = '/';
	125	}
	126	}
	127	}
	128	strncpy(full_path + dfsplen, CIFS_SB(direntry->d_sb)->prepath, pplen);
1da177e4 LT	129	return full_path;
	130	}
	131
3979877e	132	/* Inode operations in similar order to how they appear in Linux file fs.h */
1da177e4 LT	133
	134	int
	135	cifs_create(struct inode inode, struct dentry direntry, int mode,
	136	struct nameidata *nd)
	137	{
	138	int rc = -ENOENT;
	139	int xid;
67750fb9	140	int create_options = CREATE_NOT_DIR;
1da177e4 LT	141	int oplock = 0;
	142	int desiredAccess = GENERIC_READ \| GENERIC_WRITE;
	143	__u16 fileHandle;
	144	struct cifs_sb_info *cifs_sb;
	145	struct cifsTconInfo *pTcon;
	146	char *full_path = NULL;
fb8c4b14	147	FILE_ALL_INFO *buf = NULL;
1da177e4	148	struct inode *newinode = NULL;
fb8c4b14 SF	149	struct cifsFileInfo *pCifsFile = NULL;
fb8c4b14 SF	150	struct cifsInodeInfo *pCifsInode;
1da177e4	151	int disposition = FILE_OVERWRITE_IF;
4b18f2a9	152	bool write_only = false;
1da177e4 LT	153
	154	xid = GetXid();
	155
	156	cifs_sb = CIFS_SB(inode->i_sb);
	157	pTcon = cifs_sb->tcon;
	158
1da177e4	159	full_path = build_path_from_dentry(direntry);
5fdae1f6	160	if (full_path == NULL) {
1da177e4 LT	161	FreeXid(xid);
	162	return -ENOMEM;
	163	}
	164
5fdae1f6	165	if (nd && (nd->flags & LOOKUP_OPEN)) {
e08fc045 MS	166	int oflags = nd->intent.open.flags;
	167
	168	desiredAccess = 0;
	169	if (oflags & FMODE_READ)
	170	desiredAccess \|= GENERIC_READ;
	171	if (oflags & FMODE_WRITE) {
	172	desiredAccess \|= GENERIC_WRITE;
	173	if (!(oflags & FMODE_READ))
4b18f2a9	174	write_only = true;
1da177e4 LT	175	}
1da177e4 LT	176
5fdae1f6	177	if ((oflags & (O_CREAT \| O_EXCL)) == (O_CREAT \| O_EXCL))
1da177e4	178	disposition = FILE_CREATE;
5fdae1f6	179	else if ((oflags & (O_CREAT \| O_TRUNC)) == (O_CREAT \| O_TRUNC))
1da177e4	180	disposition = FILE_OVERWRITE_IF;
5fdae1f6	181	else if ((oflags & O_CREAT) == O_CREAT)
1da177e4	182	disposition = FILE_OPEN_IF;
ad7a2926	183	else
5fdae1f6	184	cFYI(1, ("Create flag not set in create function"));
1da177e4 LT	185	}
1da177e4 LT	186
5fdae1f6 SF	187	/* BB add processing to set equivalent of mode - e.g. via CreateX with
5fdae1f6 SF	188	ACLs */
1da177e4 LT	189	if (oplockEnabled)
	190	oplock = REQ_OPLOCK;
	191
5fdae1f6 SF	192	buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
5fdae1f6 SF	193	if (buf == NULL) {
1da177e4 LT	194	kfree(full_path);
	195	FreeXid(xid);
	196	return -ENOMEM;
	197	}
67750fb9 JL	198
	199	mode &= ~current->fs->umask;
	200
	201	/*
	202	* if we're not using unix extensions, see if we need to set
	203	* ATTR_READONLY on the create call
	204	*/
	205	if (!pTcon->unix_ext && (mode & S_IWUGO) == 0)
	206	create_options \|= CREATE_OPTION_READONLY;
	207
5fdae1f6	208	if (cifs_sb->tcon->ses->capabilities & CAP_NT_SMBS)
5bafd765	209	rc = CIFSSMBOpen(xid, pTcon, full_path, disposition,
67750fb9	210	desiredAccess, create_options,
737b758c SF	211	&fileHandle, &oplock, buf, cifs_sb->local_nls,
737b758c SF	212	cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
5bafd765 SF	213	else
	214	rc = -EIO; /* no NT SMB support fall into legacy open below */
	215
5fdae1f6	216	if (rc == -EIO) {
a9d02ad4 SF	217	/* old server, retry the open legacy style */
a9d02ad4 SF	218	rc = SMBLegacyOpen(xid, pTcon, full_path, disposition,
67750fb9	219	desiredAccess, create_options,
a9d02ad4 SF	220	&fileHandle, &oplock, buf, cifs_sb->local_nls,
a9d02ad4 SF	221	cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
5fdae1f6	222	}
1da177e4	223	if (rc) {
26a21b98	224	cFYI(1, ("cifs_create returned 0x%x", rc));
1da177e4 LT	225	} else {
	226	/* If Open reported that we actually created a file
	227	then we now have to set the mode if possible */
c18c842b	228	if ((pTcon->unix_ext) && (oplock & CIFS_CREATE_ACTION)) {
5fdae1f6	229	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
1da177e4	230	CIFSSMBUnixSetPerms(xid, pTcon, full_path, mode,
83451879 SF	231	(__u64)current->fsuid,
83451879 SF	232	(__u64)current->fsgid,
1da177e4	233	0 /* dev */,
5fdae1f6 SF	234	cifs_sb->local_nls,
5fdae1f6 SF	235	cifs_sb->mnt_cifs_flags &
737b758c	236	CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4 LT	237	} else {
	238	CIFSSMBUnixSetPerms(xid, pTcon, full_path, mode,
	239	(__u64)-1,
	240	(__u64)-1,
	241	0 /* dev */,
737b758c	242	cifs_sb->local_nls,
5fdae1f6	243	cifs_sb->mnt_cifs_flags &
737b758c	244	CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4	245	}
3ce53fc4	246	} else {
5fdae1f6 SF	247	/* BB implement mode setting via Windows security
	248	descriptors e.g. */
	249	/* CIFSSMBWinSetPerms(xid,pTcon,path,mode,-1,-1,nls);*/
	250
	251	/* Could set r/o dos attribute if mode & 0222 == 0 */
1da177e4 LT	252	}
1da177e4 LT	253
c18c842b SF	254	/* server might mask mode so we have to query for it */
c18c842b SF	255	if (pTcon->unix_ext)
1da177e4	256	rc = cifs_get_inode_info_unix(&newinode, full_path,
5fdae1f6	257	inode->i_sb, xid);
1da177e4 LT	258	else {
1da177e4 LT	259	rc = cifs_get_inode_info(&newinode, full_path,
8b1327f6 SF	260	buf, inode->i_sb, xid,
8b1327f6 SF	261	&fileHandle);
5fdae1f6	262	if (newinode) {
1da177e4	263	newinode->i_mode = mode;
5fdae1f6 SF	264	if ((oplock & CIFS_CREATE_ACTION) &&
5fdae1f6 SF	265	(cifs_sb->mnt_cifs_flags &
6473a559 SF	266	CIFS_MOUNT_SET_UID)) {
	267	newinode->i_uid = current->fsuid;
	268	newinode->i_gid = current->fsgid;
	269	}
	270	}
1da177e4 LT	271	}
	272
	273	if (rc != 0) {
4a6d87f1 SF	274	cFYI(1,
4a6d87f1 SF	275	("Create worked but get_inode_info failed rc = %d",
1da177e4 LT	276	rc));
1da177e4 LT	277	} else {
b92327fe SF	278	if (pTcon->nocase)
	279	direntry->d_op = &cifs_ci_dentry_ops;
	280	else
	281	direntry->d_op = &cifs_dentry_ops;
1da177e4 LT	282	d_instantiate(direntry, newinode);
1da177e4 LT	283	}
7521a3c5	284	if ((nd == NULL /* nfsd case - nfs srv does not set nd */) \|\|
4b18f2a9	285	(!(nd->flags & LOOKUP_OPEN))) {
1da177e4 LT	286	/* mknod case - do not leave file open */
1da177e4 LT	287	CIFSSMBClose(xid, pTcon, fileHandle);
5fdae1f6	288	} else if (newinode) {
d14537f1	289	pCifsFile =
92ad9b93	290	kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL);
221601c3	291
5fdae1f6	292	if (pCifsFile == NULL)
d14537f1	293	goto cifs_create_out;
d14537f1 SF	294	pCifsFile->netfid = fileHandle;
	295	pCifsFile->pid = current->tgid;
	296	pCifsFile->pInode = newinode;
4b18f2a9 SF	297	pCifsFile->invalidHandle = false;
4b18f2a9 SF	298	pCifsFile->closePend = false;
d14537f1	299	init_MUTEX(&pCifsFile->fh_sem);
796e5661	300	mutex_init(&pCifsFile->lock_mutex);
e466e487	301	INIT_LIST_HEAD(&pCifsFile->llist);
5fdae1f6	302	atomic_set(&pCifsFile->wrtPending, 0);
e466e487	303
5fdae1f6	304	/* set the following in open now
d14537f1 SF	305	pCifsFile->pfile = file; */
d14537f1 SF	306	write_lock(&GlobalSMBSeslock);
5fdae1f6	307	list_add(&pCifsFile->tlist, &pTcon->openFileList);
d14537f1	308	pCifsInode = CIFS_I(newinode);
5fdae1f6	309	if (pCifsInode) {
1da177e4	310	/* if readable file instance put first in list*/
4b18f2a9	311	if (write_only) {
5fdae1f6	312	list_add_tail(&pCifsFile->flist,
d14537f1 SF	313	&pCifsInode->openFileList);
	314	} else {
	315	list_add(&pCifsFile->flist,
	316	&pCifsInode->openFileList);
1da177e4	317	}
5fdae1f6	318	if ((oplock & 0xF) == OPLOCK_EXCLUSIVE) {
4b18f2a9 SF	319	pCifsInode->clientCanCacheAll = true;
4b18f2a9 SF	320	pCifsInode->clientCanCacheRead = true;
221601c3	321	cFYI(1, ("Exclusive Oplock inode %p",
d14537f1	322	newinode));
5fdae1f6	323	} else if ((oplock & 0xF) == OPLOCK_READ)
4b18f2a9	324	pCifsInode->clientCanCacheRead = true;
1da177e4	325	}
d14537f1	326	write_unlock(&GlobalSMBSeslock);
1da177e4	327	}
5fdae1f6	328	}
d14537f1 SF	329	cifs_create_out:
	330	kfree(buf);
	331	kfree(full_path);
1da177e4	332	FreeXid(xid);
1da177e4 LT	333	return rc;
	334	}
	335
5fdae1f6 SF	336	int cifs_mknod(struct inode inode, struct dentry direntry, int mode,
5fdae1f6 SF	337	dev_t device_number)
1da177e4 LT	338	{
	339	int rc = -EPERM;
	340	int xid;
	341	struct cifs_sb_info *cifs_sb;
	342	struct cifsTconInfo *pTcon;
	343	char *full_path = NULL;
fb8c4b14	344	struct inode *newinode = NULL;
1da177e4 LT	345
	346	if (!old_valid_dev(device_number))
	347	return -EINVAL;
	348
	349	xid = GetXid();
	350
	351	cifs_sb = CIFS_SB(inode->i_sb);
	352	pTcon = cifs_sb->tcon;
	353
1da177e4	354	full_path = build_path_from_dentry(direntry);
5fdae1f6	355	if (full_path == NULL)
1da177e4	356	rc = -ENOMEM;
c18c842b	357	else if (pTcon->unix_ext) {
3ce53fc4	358	mode &= ~current->fs->umask;
5fdae1f6	359	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
1da177e4	360	rc = CIFSSMBUnixSetPerms(xid, pTcon, full_path,
5fdae1f6 SF	361	mode, (__u64)current->fsuid,
5fdae1f6 SF	362	(__u64)current->fsgid,
737b758c	363	device_number, cifs_sb->local_nls,
5fdae1f6	364	cifs_sb->mnt_cifs_flags &
737b758c	365	CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4 LT	366	} else {
	367	rc = CIFSSMBUnixSetPerms(xid, pTcon,
	368	full_path, mode, (__u64)-1, (__u64)-1,
737b758c	369	device_number, cifs_sb->local_nls,
5fdae1f6	370	cifs_sb->mnt_cifs_flags &
737b758c	371	CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4 LT	372	}
1da177e4 LT	373
5fdae1f6	374	if (!rc) {
1da177e4	375	rc = cifs_get_inode_info_unix(&newinode, full_path,
5fdae1f6	376	inode->i_sb, xid);
b92327fe SF	377	if (pTcon->nocase)
	378	direntry->d_op = &cifs_ci_dentry_ops;
	379	else
	380	direntry->d_op = &cifs_dentry_ops;
5fdae1f6	381	if (rc == 0)
1da177e4 LT	382	d_instantiate(direntry, newinode);
1da177e4 LT	383	}
d7245c2c	384	} else {
5fdae1f6	385	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
eda3c029 SF	386	int oplock = 0;
eda3c029 SF	387	u16 fileHandle;
ad7a2926	388	FILE_ALL_INFO *buf;
d7245c2c	389
5fdae1f6	390	cFYI(1, ("sfu compat create special file"));
d7245c2c	391
5fdae1f6 SF	392	buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
5fdae1f6 SF	393	if (buf == NULL) {
eda3c029 SF	394	kfree(full_path);
	395	FreeXid(xid);
	396	return -ENOMEM;
	397	}
	398
	399	rc = CIFSSMBOpen(xid, pTcon, full_path,
	400	FILE_CREATE, /* fail if exists */
5fdae1f6	401	GENERIC_WRITE /* BB would
eda3c029 SF	402	WRITE_OWNER \| WRITE_DAC be better? */,
	403	/* Create a file and set the
	404	file attribute to SYSTEM */
	405	CREATE_NOT_DIR \| CREATE_OPTION_SPECIAL,
	406	&fileHandle, &oplock, buf,
	407	cifs_sb->local_nls,
5fdae1f6	408	cifs_sb->mnt_cifs_flags &
eda3c029 SF	409	CIFS_MOUNT_MAP_SPECIAL_CHR);
eda3c029 SF	410
5bafd765 SF	411	/* BB FIXME - add handling for backlevel servers
5bafd765 SF	412	which need legacy open and check for all
5fdae1f6 SF	413	calls to SMBOpen for fallback to SMBLeagcyOpen */
5fdae1f6 SF	414	if (!rc) {
eda3c029	415	/* BB Do not bother to decode buf since no
86c96b4b SF	416	local inode yet to put timestamps in,
86c96b4b SF	417	but we can reuse it safely */
77159b4d	418	unsigned int bytes_written;
86c96b4b SF	419	struct win_dev *pdev;
86c96b4b SF	420	pdev = (struct win_dev *)buf;
5fdae1f6	421	if (S_ISCHR(mode)) {
86c96b4b SF	422	memcpy(pdev->type, "IntxCHR", 8);
	423	pdev->major =
	424	cpu_to_le64(MAJOR(device_number));
5fdae1f6	425	pdev->minor =
86c96b4b SF	426	cpu_to_le64(MINOR(device_number));
	427	rc = CIFSSMBWrite(xid, pTcon,
	428	fileHandle,
	429	sizeof(struct win_dev),
	430	0, &bytes_written, (char *)pdev,
	431	NULL, 0);
5fdae1f6	432	} else if (S_ISBLK(mode)) {
86c96b4b SF	433	memcpy(pdev->type, "IntxBLK", 8);
	434	pdev->major =
	435	cpu_to_le64(MAJOR(device_number));
	436	pdev->minor =
	437	cpu_to_le64(MINOR(device_number));
	438	rc = CIFSSMBWrite(xid, pTcon,
	439	fileHandle,
	440	sizeof(struct win_dev),
	441	0, &bytes_written, (char *)pdev,
	442	NULL, 0);
	443	} /* else if(S_ISFIFO */
eda3c029 SF	444	CIFSSMBClose(xid, pTcon, fileHandle);
	445	d_drop(direntry);
	446	}
	447	kfree(buf);
d7245c2c SF	448	/* add code here to set EAs */
d7245c2c SF	449	}
1da177e4 LT	450	}
1da177e4 LT	451
d14537f1	452	kfree(full_path);
1da177e4	453	FreeXid(xid);
1da177e4 LT	454	return rc;
	455	}
	456
	457
	458	struct dentry *
5fdae1f6 SF	459	cifs_lookup(struct inode parent_dir_inode, struct dentry direntry,
5fdae1f6 SF	460	struct nameidata *nd)
1da177e4 LT	461	{
	462	int xid;
	463	int rc = 0; /* to get around spurious gcc warning, set to zero here */
	464	struct cifs_sb_info *cifs_sb;
	465	struct cifsTconInfo *pTcon;
	466	struct inode *newInode = NULL;
	467	char *full_path = NULL;
	468
	469	xid = GetXid();
	470
92ad9b93	471	cFYI(1, (" parent inode = 0x%p name is: %s and dentry = 0x%p",
1da177e4 LT	472	parent_dir_inode, direntry->d_name.name, direntry));
1da177e4 LT	473
1da177e4 LT	474	/* check whether path exists */
	475
	476	cifs_sb = CIFS_SB(parent_dir_inode->i_sb);
	477	pTcon = cifs_sb->tcon;
	478
296034f7 SF	479	/*
	480	* Don't allow the separator character in a path component.
	481	* The VFS will not allow "/", but "\" is allowed by posix.
	482	*/
	483	if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)) {
	484	int i;
	485	for (i = 0; i < direntry->d_name.len; i++)
	486	if (direntry->d_name.name[i] == '\\') {
	487	cFYI(1, ("Invalid file name"));
	488	FreeXid(xid);
	489	return ERR_PTR(-EINVAL);
	490	}
	491	}
	492
1da177e4 LT	493	/* can not grab the rename sem here since it would
	494	deadlock in the cases (beginning of sys_rename itself)
	495	in which we already have the sb rename sem */
	496	full_path = build_path_from_dentry(direntry);
5fdae1f6	497	if (full_path == NULL) {
1da177e4 LT	498	FreeXid(xid);
	499	return ERR_PTR(-ENOMEM);
	500	}
	501
	502	if (direntry->d_inode != NULL) {
	503	cFYI(1, (" non-NULL inode in lookup"));
	504	} else {
	505	cFYI(1, (" NULL inode in lookup"));
	506	}
	507	cFYI(1,
	508	(" Full path: %s inode = 0x%p", full_path, direntry->d_inode));
	509
c18c842b	510	if (pTcon->unix_ext)
1da177e4	511	rc = cifs_get_inode_info_unix(&newInode, full_path,
5fdae1f6	512	parent_dir_inode->i_sb, xid);
1da177e4 LT	513	else
1da177e4 LT	514	rc = cifs_get_inode_info(&newInode, full_path, NULL,
8b1327f6	515	parent_dir_inode->i_sb, xid, NULL);
1da177e4 LT	516
1da177e4 LT	517	if ((rc == 0) && (newInode != NULL)) {
b92327fe SF	518	if (pTcon->nocase)
	519	direntry->d_op = &cifs_ci_dentry_ops;
	520	else
	521	direntry->d_op = &cifs_dentry_ops;
1da177e4 LT	522	d_add(direntry, newInode);
1da177e4 LT	523
5fdae1f6	524	/* since paths are not looked up by component - the parent
3abb9272	525	directories are presumed to be good here */
1da177e4 LT	526	renew_parental_timestamps(direntry);
	527
	528	} else if (rc == -ENOENT) {
	529	rc = 0;
3abb9272 SF	530	direntry->d_time = jiffies;
	531	if (pTcon->nocase)
	532	direntry->d_op = &cifs_ci_dentry_ops;
	533	else
	534	direntry->d_op = &cifs_dentry_ops;
1da177e4	535	d_add(direntry, NULL);
5fdae1f6 SF	536	/* if it was once a directory (but how can we tell?) we could do
5fdae1f6 SF	537	shrink_dcache_parent(direntry); */
ed2b9170 SF	538	} else if (rc != -EACCES) {
	539	cERROR(1, ("Unexpected lookup error %d", rc));
	540	/* We special case check for Access Denied - since that
	541	is a common return code */
1da177e4 LT	542	}
1da177e4 LT	543
d14537f1	544	kfree(full_path);
1da177e4 LT	545	FreeXid(xid);
	546	return ERR_PTR(rc);
	547	}
	548
1da177e4 LT	549	static int
	550	cifs_d_revalidate(struct dentry direntry, struct nameidata nd)
	551	{
	552	int isValid = 1;
	553
1da177e4	554	if (direntry->d_inode) {
ad7a2926	555	if (cifs_revalidate(direntry))
1da177e4	556	return 0;
1da177e4	557	} else {
3abb9272 SF	558	cFYI(1, ("neg dentry 0x%p name = %s",
3abb9272 SF	559	direntry, direntry->d_name.name));
5fdae1f6	560	if (time_after(jiffies, direntry->d_time + HZ) \|\|
3abb9272 SF	561	!lookupCacheEnabled) {
	562	d_drop(direntry);
	563	isValid = 0;
5fdae1f6	564	}
1da177e4 LT	565	}
1da177e4 LT	566
1da177e4 LT	567	return isValid;
	568	}
	569
	570	/* static int cifs_d_delete(struct dentry *direntry)
	571	{
	572	int rc = 0;
	573
	574	cFYI(1, ("In cifs d_delete, name = %s", direntry->d_name.name));
	575
	576	return rc;
	577	} */
	578
	579	struct dentry_operations cifs_dentry_ops = {
	580	.d_revalidate = cifs_d_revalidate,
5fdae1f6	581	/* d_delete: cifs_d_delete, / / not needed except for debugging */
1da177e4	582	};
b92327fe SF	583
	584	static int cifs_ci_hash(struct dentry dentry, struct qstr q)
	585	{
	586	struct nls_table *codepage = CIFS_SB(dentry->d_inode->i_sb)->local_nls;
	587	unsigned long hash;
	588	int i;
	589
	590	hash = init_name_hash();
	591	for (i = 0; i < q->len; i++)
	592	hash = partial_name_hash(nls_tolower(codepage, q->name[i]),
	593	hash);
	594	q->hash = end_name_hash(hash);
	595
	596	return 0;
	597	}
	598
	599	static int cifs_ci_compare(struct dentry dentry, struct qstr a,
	600	struct qstr *b)
	601	{
	602	struct nls_table *codepage = CIFS_SB(dentry->d_inode->i_sb)->local_nls;
	603
	604	if ((a->len == b->len) &&
	605	(nls_strnicmp(codepage, a->name, b->name, a->len) == 0)) {
	606	/*
	607	* To preserve case, don't let an existing negative dentry's
	608	* case take precedence. If a is not a negative dentry, this
	609	* should have no side effects
	610	*/
c3291637	611	memcpy((void *)a->name, b->name, a->len);
b92327fe SF	612	return 0;
	613	}
	614	return 1;
	615	}
	616
	617	struct dentry_operations cifs_ci_dentry_ops = {
	618	.d_revalidate = cifs_d_revalidate,
	619	.d_hash = cifs_ci_hash,
	620	.d_compare = cifs_ci_compare,
	621	};