[GitHub/mt8127/android_kernel_alcatel_ttab.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 (sfrench@us.ibm.com)
 *
 *   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;
	char *full_path;
	char dirsep;

	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 */

	dirsep = CIFS_DIR_SEP(CIFS_SB(direntry->d_sb));
	pplen = CIFS_SB(direntry->d_sb)->prepathlen;
cifs_bp_rename_retry:
	namelen = pplen;
	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) {
		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 */
	strncpy(full_path, 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 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;
	int 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;
	}
	if (cifs_sb->tcon->ses->capabilities & CAP_NT_SMBS)
		rc = CIFSSMBOpen(xid, pTcon, full_path, disposition,
			 desiredAccess, CREATE_NOT_DIR,
			 &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_NOT_DIR,
			&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)) {
			mode &= ~current->fs->umask;
			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);
			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) == FALSE)) {
			/* 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 == TRUE) {
					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);

	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(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 (sfrench@us.ibm.com)
	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;
1da177e4	52	char *full_path;
88274815	53	char dirsep;
1da177e4	54
5fdae1f6	55	if (direntry == NULL)
1da177e4 LT	56	return NULL; /* not much we can do if dentry is freed and
	57	we need to reopen the file after it was closed implicitly
	58	when the server crashed */
	59
88274815	60	dirsep = CIFS_DIR_SEP(CIFS_SB(direntry->d_sb));
2fe87f02	61	pplen = CIFS_SB(direntry->d_sb)->prepathlen;
1da177e4	62	cifs_bp_rename_retry:
5fdae1f6	63	namelen = pplen;
1da177e4 LT	64	for (temp = direntry; !IS_ROOT(temp);) {
	65	namelen += (1 + temp->d_name.len);
	66	temp = temp->d_parent;
5fdae1f6 SF	67	if (temp == NULL) {
5fdae1f6 SF	68	cERROR(1, ("corrupt dentry"));
1da177e4 LT	69	return NULL;
	70	}
	71	}
	72
	73	full_path = kmalloc(namelen+1, GFP_KERNEL);
5fdae1f6	74	if (full_path == NULL)
1da177e4 LT	75	return full_path;
1da177e4 LT	76	full_path[namelen] = 0; /* trailing null */
1da177e4 LT	77	for (temp = direntry; !IS_ROOT(temp);) {
	78	namelen -= 1 + temp->d_name.len;
	79	if (namelen < 0) {
	80	break;
	81	} else {
7f57356b	82	full_path[namelen] = dirsep;
1da177e4 LT	83	strncpy(full_path + namelen + 1, temp->d_name.name,
1da177e4 LT	84	temp->d_name.len);
2fe87f02	85	cFYI(0, ("name: %s", full_path + namelen));
1da177e4 LT	86	}
1da177e4 LT	87	temp = temp->d_parent;
5fdae1f6 SF	88	if (temp == NULL) {
5fdae1f6 SF	89	cERROR(1, ("corrupt dentry"));
1da177e4 LT	90	kfree(full_path);
	91	return NULL;
	92	}
	93	}
2fe87f02	94	if (namelen != pplen) {
1da177e4	95	cERROR(1,
2fe87f02	96	("did not end path lookup where expected namelen is %d",
1da177e4	97	namelen));
5fdae1f6	98	/* presumably this is only possible if racing with a rename
1da177e4 LT	99	of one of the parent directories (we can not lock the dentries
	100	above us to prevent this, but retrying should be harmless) */
	101	kfree(full_path);
1da177e4 LT	102	goto cifs_bp_rename_retry;
1da177e4 LT	103	}
2fe87f02 SF	104	/* DIR_SEP already set for byte 0 / vs \ but not for
	105	subsequent slashes in prepath which currently must
	106	be entered the right way - not sure if there is an alternative
	107	since the '\' is a valid posix character so we can not switch
	108	those safely to '/' if any are found in the middle of the prepath */
	109	/* BB test paths to Windows with '/' in the midst of prepath */
5fdae1f6	110	strncpy(full_path, CIFS_SB(direntry->d_sb)->prepath, pplen);
1da177e4 LT	111	return full_path;
	112	}
	113
3979877e	114	/* Inode operations in similar order to how they appear in Linux file fs.h */
1da177e4 LT	115
	116	int
	117	cifs_create(struct inode inode, struct dentry direntry, int mode,
	118	struct nameidata *nd)
	119	{
	120	int rc = -ENOENT;
	121	int xid;
	122	int oplock = 0;
	123	int desiredAccess = GENERIC_READ \| GENERIC_WRITE;
	124	__u16 fileHandle;
	125	struct cifs_sb_info *cifs_sb;
	126	struct cifsTconInfo *pTcon;
	127	char *full_path = NULL;
fb8c4b14	128	FILE_ALL_INFO *buf = NULL;
1da177e4	129	struct inode *newinode = NULL;
fb8c4b14 SF	130	struct cifsFileInfo *pCifsFile = NULL;
fb8c4b14 SF	131	struct cifsInodeInfo *pCifsInode;
1da177e4 LT	132	int disposition = FILE_OVERWRITE_IF;
	133	int write_only = FALSE;
	134
	135	xid = GetXid();
	136
	137	cifs_sb = CIFS_SB(inode->i_sb);
	138	pTcon = cifs_sb->tcon;
	139
1da177e4	140	full_path = build_path_from_dentry(direntry);
5fdae1f6	141	if (full_path == NULL) {
1da177e4 LT	142	FreeXid(xid);
	143	return -ENOMEM;
	144	}
	145
5fdae1f6	146	if (nd && (nd->flags & LOOKUP_OPEN)) {
e08fc045 MS	147	int oflags = nd->intent.open.flags;
	148
	149	desiredAccess = 0;
	150	if (oflags & FMODE_READ)
	151	desiredAccess \|= GENERIC_READ;
	152	if (oflags & FMODE_WRITE) {
	153	desiredAccess \|= GENERIC_WRITE;
	154	if (!(oflags & FMODE_READ))
	155	write_only = TRUE;
1da177e4 LT	156	}
1da177e4 LT	157
5fdae1f6	158	if ((oflags & (O_CREAT \| O_EXCL)) == (O_CREAT \| O_EXCL))
1da177e4	159	disposition = FILE_CREATE;
5fdae1f6	160	else if ((oflags & (O_CREAT \| O_TRUNC)) == (O_CREAT \| O_TRUNC))
1da177e4	161	disposition = FILE_OVERWRITE_IF;
5fdae1f6	162	else if ((oflags & O_CREAT) == O_CREAT)
1da177e4	163	disposition = FILE_OPEN_IF;
ad7a2926	164	else
5fdae1f6	165	cFYI(1, ("Create flag not set in create function"));
1da177e4 LT	166	}
1da177e4 LT	167
5fdae1f6 SF	168	/* BB add processing to set equivalent of mode - e.g. via CreateX with
5fdae1f6 SF	169	ACLs */
1da177e4 LT	170	if (oplockEnabled)
	171	oplock = REQ_OPLOCK;
	172
5fdae1f6 SF	173	buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
5fdae1f6 SF	174	if (buf == NULL) {
1da177e4 LT	175	kfree(full_path);
	176	FreeXid(xid);
	177	return -ENOMEM;
	178	}
5fdae1f6	179	if (cifs_sb->tcon->ses->capabilities & CAP_NT_SMBS)
5bafd765	180	rc = CIFSSMBOpen(xid, pTcon, full_path, disposition,
1da177e4	181	desiredAccess, CREATE_NOT_DIR,
737b758c SF	182	&fileHandle, &oplock, buf, cifs_sb->local_nls,
737b758c SF	183	cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
5bafd765 SF	184	else
	185	rc = -EIO; /* no NT SMB support fall into legacy open below */
	186
5fdae1f6	187	if (rc == -EIO) {
a9d02ad4 SF	188	/* old server, retry the open legacy style */
	189	rc = SMBLegacyOpen(xid, pTcon, full_path, disposition,
	190	desiredAccess, CREATE_NOT_DIR,
	191	&fileHandle, &oplock, buf, cifs_sb->local_nls,
	192	cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
5fdae1f6	193	}
1da177e4	194	if (rc) {
26a21b98	195	cFYI(1, ("cifs_create returned 0x%x", rc));
1da177e4 LT	196	} else {
	197	/* If Open reported that we actually created a file
	198	then we now have to set the mode if possible */
c18c842b	199	if ((pTcon->unix_ext) && (oplock & CIFS_CREATE_ACTION)) {
3ce53fc4	200	mode &= ~current->fs->umask;
5fdae1f6	201	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
1da177e4	202	CIFSSMBUnixSetPerms(xid, pTcon, full_path, mode,
83451879 SF	203	(__u64)current->fsuid,
83451879 SF	204	(__u64)current->fsgid,
1da177e4	205	0 /* dev */,
5fdae1f6 SF	206	cifs_sb->local_nls,
5fdae1f6 SF	207	cifs_sb->mnt_cifs_flags &
737b758c	208	CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4 LT	209	} else {
	210	CIFSSMBUnixSetPerms(xid, pTcon, full_path, mode,
	211	(__u64)-1,
	212	(__u64)-1,
	213	0 /* dev */,
737b758c	214	cifs_sb->local_nls,
5fdae1f6	215	cifs_sb->mnt_cifs_flags &
737b758c	216	CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4	217	}
3ce53fc4	218	} else {
5fdae1f6 SF	219	/* BB implement mode setting via Windows security
	220	descriptors e.g. */
	221	/* CIFSSMBWinSetPerms(xid,pTcon,path,mode,-1,-1,nls);*/
	222
	223	/* Could set r/o dos attribute if mode & 0222 == 0 */
1da177e4 LT	224	}
1da177e4 LT	225
c18c842b SF	226	/* server might mask mode so we have to query for it */
c18c842b SF	227	if (pTcon->unix_ext)
1da177e4	228	rc = cifs_get_inode_info_unix(&newinode, full_path,
5fdae1f6	229	inode->i_sb, xid);
1da177e4 LT	230	else {
1da177e4 LT	231	rc = cifs_get_inode_info(&newinode, full_path,
5fdae1f6 SF	232	buf, inode->i_sb, xid);
5fdae1f6 SF	233	if (newinode) {
1da177e4	234	newinode->i_mode = mode;
5fdae1f6 SF	235	if ((oplock & CIFS_CREATE_ACTION) &&
5fdae1f6 SF	236	(cifs_sb->mnt_cifs_flags &
6473a559 SF	237	CIFS_MOUNT_SET_UID)) {
	238	newinode->i_uid = current->fsuid;
	239	newinode->i_gid = current->fsgid;
	240	}
	241	}
1da177e4 LT	242	}
	243
	244	if (rc != 0) {
4a6d87f1 SF	245	cFYI(1,
4a6d87f1 SF	246	("Create worked but get_inode_info failed rc = %d",
1da177e4 LT	247	rc));
1da177e4 LT	248	} else {
b92327fe SF	249	if (pTcon->nocase)
	250	direntry->d_op = &cifs_ci_dentry_ops;
	251	else
	252	direntry->d_op = &cifs_dentry_ops;
1da177e4 LT	253	d_instantiate(direntry, newinode);
1da177e4 LT	254	}
7521a3c5 SF	255	if ((nd == NULL /* nfsd case - nfs srv does not set nd */) \|\|
7521a3c5 SF	256	((nd->flags & LOOKUP_OPEN) == FALSE)) {
1da177e4 LT	257	/* mknod case - do not leave file open */
1da177e4 LT	258	CIFSSMBClose(xid, pTcon, fileHandle);
5fdae1f6	259	} else if (newinode) {
d14537f1	260	pCifsFile =
92ad9b93	261	kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL);
221601c3	262
5fdae1f6	263	if (pCifsFile == NULL)
d14537f1	264	goto cifs_create_out;
d14537f1 SF	265	pCifsFile->netfid = fileHandle;
	266	pCifsFile->pid = current->tgid;
	267	pCifsFile->pInode = newinode;
	268	pCifsFile->invalidHandle = FALSE;
	269	pCifsFile->closePend = FALSE;
	270	init_MUTEX(&pCifsFile->fh_sem);
796e5661	271	mutex_init(&pCifsFile->lock_mutex);
e466e487	272	INIT_LIST_HEAD(&pCifsFile->llist);
5fdae1f6	273	atomic_set(&pCifsFile->wrtPending, 0);
e466e487	274
5fdae1f6	275	/* set the following in open now
d14537f1 SF	276	pCifsFile->pfile = file; */
d14537f1 SF	277	write_lock(&GlobalSMBSeslock);
5fdae1f6	278	list_add(&pCifsFile->tlist, &pTcon->openFileList);
d14537f1	279	pCifsInode = CIFS_I(newinode);
5fdae1f6	280	if (pCifsInode) {
1da177e4	281	/* if readable file instance put first in list*/
d14537f1	282	if (write_only == TRUE) {
5fdae1f6	283	list_add_tail(&pCifsFile->flist,
d14537f1 SF	284	&pCifsInode->openFileList);
	285	} else {
	286	list_add(&pCifsFile->flist,
	287	&pCifsInode->openFileList);
1da177e4	288	}
5fdae1f6	289	if ((oplock & 0xF) == OPLOCK_EXCLUSIVE) {
d14537f1 SF	290	pCifsInode->clientCanCacheAll = TRUE;
d14537f1 SF	291	pCifsInode->clientCanCacheRead = TRUE;
221601c3	292	cFYI(1, ("Exclusive Oplock inode %p",
d14537f1	293	newinode));
5fdae1f6	294	} else if ((oplock & 0xF) == OPLOCK_READ)
d14537f1	295	pCifsInode->clientCanCacheRead = TRUE;
1da177e4	296	}
d14537f1	297	write_unlock(&GlobalSMBSeslock);
1da177e4	298	}
5fdae1f6	299	}
d14537f1 SF	300	cifs_create_out:
	301	kfree(buf);
	302	kfree(full_path);
1da177e4	303	FreeXid(xid);
1da177e4 LT	304	return rc;
	305	}
	306
5fdae1f6 SF	307	int cifs_mknod(struct inode inode, struct dentry direntry, int mode,
5fdae1f6 SF	308	dev_t device_number)
1da177e4 LT	309	{
	310	int rc = -EPERM;
	311	int xid;
	312	struct cifs_sb_info *cifs_sb;
	313	struct cifsTconInfo *pTcon;
	314	char *full_path = NULL;
fb8c4b14	315	struct inode *newinode = NULL;
1da177e4 LT	316
	317	if (!old_valid_dev(device_number))
	318	return -EINVAL;
	319
	320	xid = GetXid();
	321
	322	cifs_sb = CIFS_SB(inode->i_sb);
	323	pTcon = cifs_sb->tcon;
	324
1da177e4	325	full_path = build_path_from_dentry(direntry);
5fdae1f6	326	if (full_path == NULL)
1da177e4	327	rc = -ENOMEM;
c18c842b	328	else if (pTcon->unix_ext) {
3ce53fc4	329	mode &= ~current->fs->umask;
5fdae1f6	330	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
1da177e4	331	rc = CIFSSMBUnixSetPerms(xid, pTcon, full_path,
5fdae1f6 SF	332	mode, (__u64)current->fsuid,
5fdae1f6 SF	333	(__u64)current->fsgid,
737b758c	334	device_number, cifs_sb->local_nls,
5fdae1f6	335	cifs_sb->mnt_cifs_flags &
737b758c	336	CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4 LT	337	} else {
	338	rc = CIFSSMBUnixSetPerms(xid, pTcon,
	339	full_path, mode, (__u64)-1, (__u64)-1,
737b758c	340	device_number, cifs_sb->local_nls,
5fdae1f6	341	cifs_sb->mnt_cifs_flags &
737b758c	342	CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4 LT	343	}
1da177e4 LT	344
5fdae1f6	345	if (!rc) {
1da177e4	346	rc = cifs_get_inode_info_unix(&newinode, full_path,
5fdae1f6	347	inode->i_sb, xid);
b92327fe SF	348	if (pTcon->nocase)
	349	direntry->d_op = &cifs_ci_dentry_ops;
	350	else
	351	direntry->d_op = &cifs_dentry_ops;
5fdae1f6	352	if (rc == 0)
1da177e4 LT	353	d_instantiate(direntry, newinode);
1da177e4 LT	354	}
d7245c2c	355	} else {
5fdae1f6	356	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
eda3c029 SF	357	int oplock = 0;
eda3c029 SF	358	u16 fileHandle;
ad7a2926	359	FILE_ALL_INFO *buf;
d7245c2c	360
5fdae1f6	361	cFYI(1, ("sfu compat create special file"));
d7245c2c	362
5fdae1f6 SF	363	buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
5fdae1f6 SF	364	if (buf == NULL) {
eda3c029 SF	365	kfree(full_path);
	366	FreeXid(xid);
	367	return -ENOMEM;
	368	}
	369
	370	rc = CIFSSMBOpen(xid, pTcon, full_path,
	371	FILE_CREATE, /* fail if exists */
5fdae1f6	372	GENERIC_WRITE /* BB would
eda3c029 SF	373	WRITE_OWNER \| WRITE_DAC be better? */,
	374	/* Create a file and set the
	375	file attribute to SYSTEM */
	376	CREATE_NOT_DIR \| CREATE_OPTION_SPECIAL,
	377	&fileHandle, &oplock, buf,
	378	cifs_sb->local_nls,
5fdae1f6	379	cifs_sb->mnt_cifs_flags &
eda3c029 SF	380	CIFS_MOUNT_MAP_SPECIAL_CHR);
eda3c029 SF	381
5bafd765 SF	382	/* BB FIXME - add handling for backlevel servers
5bafd765 SF	383	which need legacy open and check for all
5fdae1f6 SF	384	calls to SMBOpen for fallback to SMBLeagcyOpen */
5fdae1f6 SF	385	if (!rc) {
eda3c029	386	/* BB Do not bother to decode buf since no
86c96b4b SF	387	local inode yet to put timestamps in,
86c96b4b SF	388	but we can reuse it safely */
77159b4d	389	unsigned int bytes_written;
86c96b4b SF	390	struct win_dev *pdev;
86c96b4b SF	391	pdev = (struct win_dev *)buf;
5fdae1f6	392	if (S_ISCHR(mode)) {
86c96b4b SF	393	memcpy(pdev->type, "IntxCHR", 8);
	394	pdev->major =
	395	cpu_to_le64(MAJOR(device_number));
5fdae1f6	396	pdev->minor =
86c96b4b SF	397	cpu_to_le64(MINOR(device_number));
	398	rc = CIFSSMBWrite(xid, pTcon,
	399	fileHandle,
	400	sizeof(struct win_dev),
	401	0, &bytes_written, (char *)pdev,
	402	NULL, 0);
5fdae1f6	403	} else if (S_ISBLK(mode)) {
86c96b4b SF	404	memcpy(pdev->type, "IntxBLK", 8);
	405	pdev->major =
	406	cpu_to_le64(MAJOR(device_number));
	407	pdev->minor =
	408	cpu_to_le64(MINOR(device_number));
	409	rc = CIFSSMBWrite(xid, pTcon,
	410	fileHandle,
	411	sizeof(struct win_dev),
	412	0, &bytes_written, (char *)pdev,
	413	NULL, 0);
	414	} /* else if(S_ISFIFO */
eda3c029 SF	415	CIFSSMBClose(xid, pTcon, fileHandle);
	416	d_drop(direntry);
	417	}
	418	kfree(buf);
d7245c2c SF	419	/* add code here to set EAs */
d7245c2c SF	420	}
1da177e4 LT	421	}
1da177e4 LT	422
d14537f1	423	kfree(full_path);
1da177e4	424	FreeXid(xid);
1da177e4 LT	425	return rc;
	426	}
	427
	428
	429	struct dentry *
5fdae1f6 SF	430	cifs_lookup(struct inode parent_dir_inode, struct dentry direntry,
5fdae1f6 SF	431	struct nameidata *nd)
1da177e4 LT	432	{
	433	int xid;
	434	int rc = 0; /* to get around spurious gcc warning, set to zero here */
	435	struct cifs_sb_info *cifs_sb;
	436	struct cifsTconInfo *pTcon;
	437	struct inode *newInode = NULL;
	438	char *full_path = NULL;
	439
	440	xid = GetXid();
	441
92ad9b93	442	cFYI(1, (" parent inode = 0x%p name is: %s and dentry = 0x%p",
1da177e4 LT	443	parent_dir_inode, direntry->d_name.name, direntry));
1da177e4 LT	444
1da177e4 LT	445	/* check whether path exists */
	446
	447	cifs_sb = CIFS_SB(parent_dir_inode->i_sb);
	448	pTcon = cifs_sb->tcon;
	449
296034f7 SF	450	/*
	451	* Don't allow the separator character in a path component.
	452	* The VFS will not allow "/", but "\" is allowed by posix.
	453	*/
	454	if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)) {
	455	int i;
	456	for (i = 0; i < direntry->d_name.len; i++)
	457	if (direntry->d_name.name[i] == '\\') {
	458	cFYI(1, ("Invalid file name"));
	459	FreeXid(xid);
	460	return ERR_PTR(-EINVAL);
	461	}
	462	}
	463
1da177e4 LT	464	/* can not grab the rename sem here since it would
	465	deadlock in the cases (beginning of sys_rename itself)
	466	in which we already have the sb rename sem */
	467	full_path = build_path_from_dentry(direntry);
5fdae1f6	468	if (full_path == NULL) {
1da177e4 LT	469	FreeXid(xid);
	470	return ERR_PTR(-ENOMEM);
	471	}
	472
	473	if (direntry->d_inode != NULL) {
	474	cFYI(1, (" non-NULL inode in lookup"));
	475	} else {
	476	cFYI(1, (" NULL inode in lookup"));
	477	}
	478	cFYI(1,
	479	(" Full path: %s inode = 0x%p", full_path, direntry->d_inode));
	480
c18c842b	481	if (pTcon->unix_ext)
1da177e4	482	rc = cifs_get_inode_info_unix(&newInode, full_path,
5fdae1f6	483	parent_dir_inode->i_sb, xid);
1da177e4 LT	484	else
1da177e4 LT	485	rc = cifs_get_inode_info(&newInode, full_path, NULL,
5fdae1f6	486	parent_dir_inode->i_sb, xid);
1da177e4 LT	487
1da177e4 LT	488	if ((rc == 0) && (newInode != NULL)) {
b92327fe SF	489	if (pTcon->nocase)
	490	direntry->d_op = &cifs_ci_dentry_ops;
	491	else
	492	direntry->d_op = &cifs_dentry_ops;
1da177e4 LT	493	d_add(direntry, newInode);
1da177e4 LT	494
5fdae1f6	495	/* since paths are not looked up by component - the parent
3abb9272	496	directories are presumed to be good here */
1da177e4 LT	497	renew_parental_timestamps(direntry);
	498
	499	} else if (rc == -ENOENT) {
	500	rc = 0;
3abb9272 SF	501	direntry->d_time = jiffies;
	502	if (pTcon->nocase)
	503	direntry->d_op = &cifs_ci_dentry_ops;
	504	else
	505	direntry->d_op = &cifs_dentry_ops;
1da177e4	506	d_add(direntry, NULL);
5fdae1f6 SF	507	/* if it was once a directory (but how can we tell?) we could do
5fdae1f6 SF	508	shrink_dcache_parent(direntry); */
ed2b9170 SF	509	} else if (rc != -EACCES) {
	510	cERROR(1, ("Unexpected lookup error %d", rc));
	511	/* We special case check for Access Denied - since that
	512	is a common return code */
1da177e4 LT	513	}
1da177e4 LT	514
d14537f1	515	kfree(full_path);
1da177e4 LT	516	FreeXid(xid);
	517	return ERR_PTR(rc);
	518	}
	519
1da177e4 LT	520	static int
	521	cifs_d_revalidate(struct dentry direntry, struct nameidata nd)
	522	{
	523	int isValid = 1;
	524
1da177e4	525	if (direntry->d_inode) {
ad7a2926	526	if (cifs_revalidate(direntry))
1da177e4	527	return 0;
1da177e4	528	} else {
3abb9272 SF	529	cFYI(1, ("neg dentry 0x%p name = %s",
3abb9272 SF	530	direntry, direntry->d_name.name));
5fdae1f6	531	if (time_after(jiffies, direntry->d_time + HZ) \|\|
3abb9272 SF	532	!lookupCacheEnabled) {
	533	d_drop(direntry);
	534	isValid = 0;
5fdae1f6	535	}
1da177e4 LT	536	}
1da177e4 LT	537
1da177e4 LT	538	return isValid;
	539	}
	540
	541	/* static int cifs_d_delete(struct dentry *direntry)
	542	{
	543	int rc = 0;
	544
	545	cFYI(1, ("In cifs d_delete, name = %s", direntry->d_name.name));
	546
	547	return rc;
	548	} */
	549
	550	struct dentry_operations cifs_dentry_ops = {
	551	.d_revalidate = cifs_d_revalidate,
5fdae1f6	552	/* d_delete: cifs_d_delete, / / not needed except for debugging */
1da177e4	553	};
b92327fe SF	554
	555	static int cifs_ci_hash(struct dentry dentry, struct qstr q)
	556	{
	557	struct nls_table *codepage = CIFS_SB(dentry->d_inode->i_sb)->local_nls;
	558	unsigned long hash;
	559	int i;
	560
	561	hash = init_name_hash();
	562	for (i = 0; i < q->len; i++)
	563	hash = partial_name_hash(nls_tolower(codepage, q->name[i]),
	564	hash);
	565	q->hash = end_name_hash(hash);
	566
	567	return 0;
	568	}
	569
	570	static int cifs_ci_compare(struct dentry dentry, struct qstr a,
	571	struct qstr *b)
	572	{
	573	struct nls_table *codepage = CIFS_SB(dentry->d_inode->i_sb)->local_nls;
	574
	575	if ((a->len == b->len) &&
	576	(nls_strnicmp(codepage, a->name, b->name, a->len) == 0)) {
	577	/*
	578	* To preserve case, don't let an existing negative dentry's
	579	* case take precedence. If a is not a negative dentry, this
	580	* should have no side effects
	581	*/
44093ca2	582	memcpy(a->name, b->name, a->len);
b92327fe SF	583	return 0;
	584	}
	585	return 1;
	586	}
	587
	588	struct dentry_operations cifs_ci_dentry_ops = {
	589	.d_revalidate = cifs_d_revalidate,
	590	.d_hash = cifs_ci_hash,
	591	.d_compare = cifs_ci_compare,
	592	};