inode.c 53.0 KB
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/*
 *   fs/cifs/inode.c
 *
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 *   Copyright (C) International Business Machines  Corp., 2002,2008
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 *   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/pagemap.h>
#include <asm/div64.h>
#include "cifsfs.h"
#include "cifspdu.h"
#include "cifsglob.h"
#include "cifsproto.h"
#include "cifs_debug.h"
#include "cifs_fs_sb.h"

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static void cifs_set_ops(struct inode *inode, const bool is_dfs_referral)
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{
	struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);

	switch (inode->i_mode & S_IFMT) {
	case S_IFREG:
		inode->i_op = &cifs_file_inode_ops;
		if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
			if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
				inode->i_fop = &cifs_file_direct_nobrl_ops;
			else
				inode->i_fop = &cifs_file_direct_ops;
		} else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
			inode->i_fop = &cifs_file_nobrl_ops;
		else { /* not direct, send byte range locks */
			inode->i_fop = &cifs_file_ops;
		}


		/* check if server can support readpages */
		if (cifs_sb->tcon->ses->server->maxBuf <
				PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE)
			inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
		else
			inode->i_data.a_ops = &cifs_addr_ops;
		break;
	case S_IFDIR:
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#ifdef CONFIG_CIFS_DFS_UPCALL
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		if (is_dfs_referral) {
			inode->i_op = &cifs_dfs_referral_inode_operations;
		} else {
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#else /* NO DFS support, treat as a directory */
		{
#endif
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			inode->i_op = &cifs_dir_inode_ops;
			inode->i_fop = &cifs_dir_ops;
		}
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		break;
	case S_IFLNK:
		inode->i_op = &cifs_symlink_inode_ops;
		break;
	default:
		init_special_inode(inode, inode->i_mode, inode->i_rdev);
		break;
	}
}

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/* populate an inode with info from a cifs_fattr struct */
void
cifs_fattr_to_inode(struct inode *inode, struct cifs_fattr *fattr)
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{
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	struct cifsInodeInfo *cifs_i = CIFS_I(inode);
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	struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
	unsigned long oldtime = cifs_i->time;
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	inode->i_atime = fattr->cf_atime;
	inode->i_mtime = fattr->cf_mtime;
	inode->i_ctime = fattr->cf_ctime;
	inode->i_rdev = fattr->cf_rdev;
	inode->i_nlink = fattr->cf_nlink;
	inode->i_uid = fattr->cf_uid;
	inode->i_gid = fattr->cf_gid;

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	/* if dynperm is set, don't clobber existing mode */
	if (inode->i_state & I_NEW ||
	    !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM))
		inode->i_mode = fattr->cf_mode;

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	cifs_i->cifsAttrs = fattr->cf_cifsattrs;
	cifs_i->uniqueid = fattr->cf_uniqueid;
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	if (fattr->cf_flags & CIFS_FATTR_NEED_REVAL)
		cifs_i->time = 0;
	else
		cifs_i->time = jiffies;

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	cFYI(1, ("inode 0x%p old_time=%ld new_time=%ld", inode,
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		 oldtime, cifs_i->time));

	cifs_i->delete_pending = fattr->cf_flags & CIFS_FATTR_DELETE_PENDING;
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	/*
	 * Can't safely change the file size here if the client is writing to
	 * it due to potential races.
	 */
	spin_lock(&inode->i_lock);
	if (is_size_safe_to_change(cifs_i, fattr->cf_eof)) {
		i_size_write(inode, fattr->cf_eof);

		/*
		 * i_blocks is not related to (i_size / i_blksize),
		 * but instead 512 byte (2**9) size is required for
		 * calculating num blocks.
		 */
		inode->i_blocks = (512 - 1 + fattr->cf_bytes) >> 9;
	}
	spin_unlock(&inode->i_lock);

	cifs_set_ops(inode, fattr->cf_flags & CIFS_FATTR_DFS_REFERRAL);
}

/* Fill a cifs_fattr struct with info from FILE_UNIX_BASIC_INFO. */
void
cifs_unix_basic_to_fattr(struct cifs_fattr *fattr, FILE_UNIX_BASIC_INFO *info,
			 struct cifs_sb_info *cifs_sb)
{
	memset(fattr, 0, sizeof(*fattr));
	fattr->cf_uniqueid = le64_to_cpu(info->UniqueId);
	fattr->cf_bytes = le64_to_cpu(info->NumOfBytes);
	fattr->cf_eof = le64_to_cpu(info->EndOfFile);

	fattr->cf_atime = cifs_NTtimeToUnix(info->LastAccessTime);
	fattr->cf_mtime = cifs_NTtimeToUnix(info->LastModificationTime);
	fattr->cf_ctime = cifs_NTtimeToUnix(info->LastStatusChange);
	fattr->cf_mode = le64_to_cpu(info->Permissions);
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	/*
	 * Since we set the inode type below we need to mask off
	 * to avoid strange results if bits set above.
	 */
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	fattr->cf_mode &= ~S_IFMT;
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	switch (le32_to_cpu(info->Type)) {
	case UNIX_FILE:
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		fattr->cf_mode |= S_IFREG;
		fattr->cf_dtype = DT_REG;
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		break;
	case UNIX_SYMLINK:
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		fattr->cf_mode |= S_IFLNK;
		fattr->cf_dtype = DT_LNK;
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		break;
	case UNIX_DIR:
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		fattr->cf_mode |= S_IFDIR;
		fattr->cf_dtype = DT_DIR;
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		break;
	case UNIX_CHARDEV:
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		fattr->cf_mode |= S_IFCHR;
		fattr->cf_dtype = DT_CHR;
		fattr->cf_rdev = MKDEV(le64_to_cpu(info->DevMajor),
				       le64_to_cpu(info->DevMinor) & MINORMASK);
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		break;
	case UNIX_BLOCKDEV:
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		fattr->cf_mode |= S_IFBLK;
		fattr->cf_dtype = DT_BLK;
		fattr->cf_rdev = MKDEV(le64_to_cpu(info->DevMajor),
				       le64_to_cpu(info->DevMinor) & MINORMASK);
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		break;
	case UNIX_FIFO:
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		fattr->cf_mode |= S_IFIFO;
		fattr->cf_dtype = DT_FIFO;
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		break;
	case UNIX_SOCKET:
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		fattr->cf_mode |= S_IFSOCK;
		fattr->cf_dtype = DT_SOCK;
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		break;
	default:
		/* safest to call it a file if we do not know */
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		fattr->cf_mode |= S_IFREG;
		fattr->cf_dtype = DT_REG;
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		cFYI(1, ("unknown type %d", le32_to_cpu(info->Type)));
		break;
	}

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	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
		fattr->cf_uid = cifs_sb->mnt_uid;
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	else
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		fattr->cf_uid = le64_to_cpu(info->Uid);
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	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
		fattr->cf_gid = cifs_sb->mnt_gid;
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	else
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		fattr->cf_gid = le64_to_cpu(info->Gid);
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	fattr->cf_nlink = le64_to_cpu(info->Nlinks);
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}

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/*
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 * Fill a cifs_fattr struct with fake inode info.
 *
 * Needed to setup cifs_fattr data for the directory which is the
 * junction to the new submount (ie to setup the fake directory
 * which represents a DFS referral).
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 */
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void
cifs_create_dfs_fattr(struct cifs_fattr *fattr, struct super_block *sb)
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{
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	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
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	cFYI(1, ("creating fake fattr for DFS referral"));

	memset(fattr, 0, sizeof(*fattr));
	fattr->cf_mode = S_IFDIR | S_IXUGO | S_IRWXU;
	fattr->cf_uid = cifs_sb->mnt_uid;
	fattr->cf_gid = cifs_sb->mnt_gid;
	fattr->cf_atime = CURRENT_TIME;
	fattr->cf_ctime = CURRENT_TIME;
	fattr->cf_mtime = CURRENT_TIME;
	fattr->cf_nlink = 2;
	fattr->cf_flags |= CIFS_FATTR_DFS_REFERRAL;
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}

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int cifs_get_inode_info_unix(struct inode **pinode,
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			     const unsigned char *full_path,
			     struct super_block *sb, int xid)
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{
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	int rc;
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	FILE_UNIX_BASIC_INFO find_data;
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	struct cifs_fattr fattr;
	struct cifsTconInfo *tcon;
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	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);

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	tcon = cifs_sb->tcon;
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	cFYI(1, ("Getting info on %s", full_path));
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	/* could have done a find first instead but this returns more info */
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	rc = CIFSSMBUnixQPathInfo(xid, tcon, full_path, &find_data,
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				  cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
					CIFS_MOUNT_MAP_SPECIAL_CHR);
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	if (!rc) {
		cifs_unix_basic_to_fattr(&fattr, &find_data, cifs_sb);
	} else if (rc == -EREMOTE) {
		cifs_create_dfs_fattr(&fattr, sb);
		rc = 0;
	} else {
		return rc;
	}
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	if (*pinode == NULL) {
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		/* get new inode */
		*pinode = cifs_iget(sb, &fattr);
		if (!*pinode)
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			rc = -ENOMEM;
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	} else {
		/* we already have inode, update it */
		cifs_fattr_to_inode(*pinode, &fattr);
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	}
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	return rc;
}

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static int
cifs_sfu_type(struct cifs_fattr *fattr, const unsigned char *path,
	      struct cifs_sb_info *cifs_sb, int xid)
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{
	int rc;
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	int oplock = 0;
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	__u16 netfid;
	struct cifsTconInfo *pTcon = cifs_sb->tcon;
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	char buf[24];
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	unsigned int bytes_read;
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	char *pbuf;
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	pbuf = buf;

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	fattr->cf_mode &= ~S_IFMT;

	if (fattr->cf_eof == 0) {
		fattr->cf_mode |= S_IFIFO;
		fattr->cf_dtype = DT_FIFO;
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		return 0;
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	} else if (fattr->cf_eof < 8) {
		fattr->cf_mode |= S_IFREG;
		fattr->cf_dtype = DT_REG;
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		return -EINVAL;	 /* EOPNOTSUPP? */
	}
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	rc = CIFSSMBOpen(xid, pTcon, path, FILE_OPEN, GENERIC_READ,
			 CREATE_NOT_DIR, &netfid, &oplock, NULL,
			 cifs_sb->local_nls,
			 cifs_sb->mnt_cifs_flags &
				CIFS_MOUNT_MAP_SPECIAL_CHR);
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	if (rc == 0) {
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		int buf_type = CIFS_NO_BUFFER;
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			/* Read header */
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		rc = CIFSSMBRead(xid, pTcon, netfid,
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				 24 /* length */, 0 /* offset */,
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				 &bytes_read, &pbuf, &buf_type);
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		if ((rc == 0) && (bytes_read >= 8)) {
			if (memcmp("IntxBLK", pbuf, 8) == 0) {
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				cFYI(1, ("Block device"));
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				fattr->cf_mode |= S_IFBLK;
				fattr->cf_dtype = DT_BLK;
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				if (bytes_read == 24) {
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					/* we have enough to decode dev num */
					__u64 mjr; /* major */
					__u64 mnr; /* minor */
					mjr = le64_to_cpu(*(__le64 *)(pbuf+8));
					mnr = le64_to_cpu(*(__le64 *)(pbuf+16));
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					fattr->cf_rdev = MKDEV(mjr, mnr);
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				}
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			} else if (memcmp("IntxCHR", pbuf, 8) == 0) {
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				cFYI(1, ("Char device"));
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				fattr->cf_mode |= S_IFCHR;
				fattr->cf_dtype = DT_CHR;
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				if (bytes_read == 24) {
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					/* we have enough to decode dev num */
					__u64 mjr; /* major */
					__u64 mnr; /* minor */
					mjr = le64_to_cpu(*(__le64 *)(pbuf+8));
					mnr = le64_to_cpu(*(__le64 *)(pbuf+16));
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					fattr->cf_rdev = MKDEV(mjr, mnr);
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				}
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			} else if (memcmp("IntxLNK", pbuf, 7) == 0) {
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				cFYI(1, ("Symlink"));
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				fattr->cf_mode |= S_IFLNK;
				fattr->cf_dtype = DT_LNK;
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			} else {
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				fattr->cf_mode |= S_IFREG; /* file? */
				fattr->cf_dtype = DT_REG;
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				rc = -EOPNOTSUPP;
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			}
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		} else {
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			fattr->cf_mode |= S_IFREG; /* then it is a file */
			fattr->cf_dtype = DT_REG;
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			rc = -EOPNOTSUPP; /* or some unknown SFU type */
		}
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		CIFSSMBClose(xid, pTcon, netfid);
	}
	return rc;
}

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#define SFBITS_MASK (S_ISVTX | S_ISGID | S_ISUID)  /* SETFILEBITS valid bits */

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/*
 * Fetch mode bits as provided by SFU.
 *
 * FIXME: Doesn't this clobber the type bit we got from cifs_sfu_type ?
 */
static int cifs_sfu_mode(struct cifs_fattr *fattr, const unsigned char *path,
			 struct cifs_sb_info *cifs_sb, int xid)
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{
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#ifdef CONFIG_CIFS_XATTR
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	ssize_t rc;
	char ea_value[4];
	__u32 mode;

	rc = CIFSSMBQueryEA(xid, cifs_sb->tcon, path, "SETFILEBITS",
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			    ea_value, 4 /* size of buf */, cifs_sb->local_nls,
			    cifs_sb->mnt_cifs_flags &
				CIFS_MOUNT_MAP_SPECIAL_CHR);
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	if (rc < 0)
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		return (int)rc;
	else if (rc > 3) {
		mode = le32_to_cpu(*((__le32 *)ea_value));
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		fattr->cf_mode &= ~SFBITS_MASK;
		cFYI(1, ("special bits 0%o org mode 0%o", mode,
			 fattr->cf_mode));
		fattr->cf_mode = (mode & SFBITS_MASK) | fattr->cf_mode;
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		cFYI(1, ("special mode bits 0%o", mode));
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	}
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	return 0;
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#else
	return -EOPNOTSUPP;
#endif
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}

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/* Fill a cifs_fattr struct with info from FILE_ALL_INFO */
void
cifs_all_info_to_fattr(struct cifs_fattr *fattr, FILE_ALL_INFO *info,
		       struct cifs_sb_info *cifs_sb, bool adjust_tz)
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{
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	memset(fattr, 0, sizeof(*fattr));
	fattr->cf_cifsattrs = le32_to_cpu(info->Attributes);
	if (info->DeletePending)
		fattr->cf_flags |= CIFS_FATTR_DELETE_PENDING;

	if (info->LastAccessTime)
		fattr->cf_atime = cifs_NTtimeToUnix(info->LastAccessTime);
	else
		fattr->cf_atime = CURRENT_TIME;

	fattr->cf_ctime = cifs_NTtimeToUnix(info->ChangeTime);
	fattr->cf_mtime = cifs_NTtimeToUnix(info->LastWriteTime);

	if (adjust_tz) {
		fattr->cf_ctime.tv_sec += cifs_sb->tcon->ses->server->timeAdj;
		fattr->cf_mtime.tv_sec += cifs_sb->tcon->ses->server->timeAdj;
	}

	fattr->cf_eof = le64_to_cpu(info->EndOfFile);
	fattr->cf_bytes = le64_to_cpu(info->AllocationSize);

	if (fattr->cf_cifsattrs & ATTR_DIRECTORY) {
		fattr->cf_mode = S_IFDIR | cifs_sb->mnt_dir_mode;
		fattr->cf_dtype = DT_DIR;
	} else {
		fattr->cf_mode = S_IFREG | cifs_sb->mnt_file_mode;
		fattr->cf_dtype = DT_REG;

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		/* clear write bits if ATTR_READONLY is set */
		if (fattr->cf_cifsattrs & ATTR_READONLY)
			fattr->cf_mode &= ~(S_IWUGO);
	}
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	fattr->cf_nlink = le32_to_cpu(info->NumberOfLinks);

	fattr->cf_uid = cifs_sb->mnt_uid;
	fattr->cf_gid = cifs_sb->mnt_gid;
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}

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int cifs_get_inode_info(struct inode **pinode,
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	const unsigned char *full_path, FILE_ALL_INFO *pfindData,
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	struct super_block *sb, int xid, const __u16 *pfid)
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{
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	int rc = 0, tmprc;
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	struct cifsTconInfo *pTcon;
	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
	char *buf = NULL;
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	bool adjustTZ = false;
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	struct cifs_fattr fattr;
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	pTcon = cifs_sb->tcon;
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	cFYI(1, ("Getting info on %s", full_path));
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	if ((pfindData == NULL) && (*pinode != NULL)) {
		if (CIFS_I(*pinode)->clientCanCacheRead) {
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			cFYI(1, ("No need to revalidate cached inode sizes"));
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			return rc;
		}
	}

	/* if file info not passed in then get it from server */
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	if (pfindData == NULL) {
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		buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
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		if (buf == NULL)
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			return -ENOMEM;
		pfindData = (FILE_ALL_INFO *)buf;
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		/* could do find first instead but this returns more info */
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		rc = CIFSSMBQPathInfo(xid, pTcon, full_path, pfindData,
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			      0 /* not legacy */,
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			      cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
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				CIFS_MOUNT_MAP_SPECIAL_CHR);
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		/* BB optimize code so we do not make the above call
		when server claims no NT SMB support and the above call
		failed at least once - set flag in tcon or mount */
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		if ((rc == -EOPNOTSUPP) || (rc == -EINVAL)) {
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			rc = SMBQueryInformation(xid, pTcon, full_path,
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					pfindData, cifs_sb->local_nls,
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					cifs_sb->mnt_cifs_flags &
					  CIFS_MOUNT_MAP_SPECIAL_CHR);
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			adjustTZ = true;
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		}
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	}
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	if (!rc) {
		cifs_all_info_to_fattr(&fattr, (FILE_ALL_INFO *) pfindData,
				       cifs_sb, adjustTZ);
	} else if (rc == -EREMOTE) {
		cifs_create_dfs_fattr(&fattr, sb);
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		rc = 0;
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	} else {
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		goto cgii_exit;
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	}
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	/*
	 * If an inode wasn't passed in, then get the inode number
	 *
	 * Is an i_ino of zero legal? Can we use that to check if the server
	 * supports returning inode numbers?  Are there other sanity checks we
	 * can use to ensure that the server is really filling in that field?
	 *
	 * We can not use the IndexNumber field by default from Windows or
	 * Samba (in ALL_INFO buf) but we can request it explicitly. The SNIA
	 * CIFS spec claims that this value is unique within the scope of a
	 * share, and the windows docs hint that it's actually unique
	 * per-machine.
	 *
	 * There may be higher info levels that work but are there Windows
	 * server or network appliances for which IndexNumber field is not
	 * guaranteed unique?
	 */
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	if (*pinode == NULL) {
		if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
			int rc1 = 0;

			rc1 = CIFSGetSrvInodeNumber(xid, pTcon,
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					full_path, &fattr.cf_uniqueid,
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					cifs_sb->local_nls,
					cifs_sb->mnt_cifs_flags &
						CIFS_MOUNT_MAP_SPECIAL_CHR);
515
			if (rc1) {
516 517
				cFYI(1, ("GetSrvInodeNum rc %d", rc1));
				fattr.cf_uniqueid = iunique(sb, ROOT_I);
518 519 520 521
				/* disable serverino if call not supported */
				if (rc1 == -EINVAL)
					cifs_sb->mnt_cifs_flags &=
							~CIFS_MOUNT_SERVER_INUM;
522 523
			}
		} else {
524
			fattr.cf_uniqueid = iunique(sb, ROOT_I);
525
		}
526
	} else {
527
		fattr.cf_uniqueid = CIFS_I(*pinode)->uniqueid;
528 529
	}

530 531 532 533 534 535
	/* query for SFU type info if supported and needed */
	if (fattr.cf_cifsattrs & ATTR_SYSTEM &&
	    cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
		tmprc = cifs_sfu_type(&fattr, full_path, cifs_sb, xid);
		if (tmprc)
			cFYI(1, ("cifs_sfu_type failed: %d", tmprc));
536
	}
L
Linus Torvalds 已提交
537

S
Steve French 已提交
538
#ifdef CONFIG_CIFS_EXPERIMENTAL
539 540 541
	/* fill in 0777 bits from ACL */
	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
		cFYI(1, ("Getting mode bits from ACL"));
542
		cifs_acl_to_fattr(cifs_sb, &fattr, *pinode, full_path, pfid);
543
	}
S
Steve French 已提交
544
#endif
545

546 547 548
	/* fill in remaining high mode bits e.g. SUID, VTX */
	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
		cifs_sfu_mode(&fattr, full_path, cifs_sb, xid);
549

550 551 552 553 554 555 556
	if (!*pinode) {
		*pinode = cifs_iget(sb, &fattr);
		if (!*pinode)
			rc = -ENOMEM;
	} else {
		cifs_fattr_to_inode(*pinode, &fattr);
	}
557

558
cgii_exit:
L
Linus Torvalds 已提交
559 560 561 562
	kfree(buf);
	return rc;
}

563 564 565 566
static const struct inode_operations cifs_ipc_inode_ops = {
	.lookup = cifs_lookup,
};

567
char *cifs_build_path_to_root(struct cifs_sb_info *cifs_sb)
568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607
{
	int pplen = cifs_sb->prepathlen;
	int dfsplen;
	char *full_path = NULL;

	/* if no prefix path, simply set path to the root of share to "" */
	if (pplen == 0) {
		full_path = kmalloc(1, GFP_KERNEL);
		if (full_path)
			full_path[0] = 0;
		return full_path;
	}

	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;

	full_path = kmalloc(dfsplen + pplen + 1, GFP_KERNEL);
	if (full_path == NULL)
		return full_path;

	if (dfsplen) {
		strncpy(full_path, cifs_sb->tcon->treeName, dfsplen);
		/* switch slash direction in prepath depending on whether
		 * windows or posix style path names
		 */
		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->prepath, pplen);
	full_path[dfsplen + pplen] = 0; /* add trailing null */
	return full_path;
}

608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655
static int
cifs_find_inode(struct inode *inode, void *opaque)
{
	struct cifs_fattr *fattr = (struct cifs_fattr *) opaque;

	if (CIFS_I(inode)->uniqueid != fattr->cf_uniqueid)
		return 0;

	return 1;
}

static int
cifs_init_inode(struct inode *inode, void *opaque)
{
	struct cifs_fattr *fattr = (struct cifs_fattr *) opaque;

	CIFS_I(inode)->uniqueid = fattr->cf_uniqueid;
	return 0;
}

/* Given fattrs, get a corresponding inode */
struct inode *
cifs_iget(struct super_block *sb, struct cifs_fattr *fattr)
{
	unsigned long hash;
	struct inode *inode;

	cFYI(1, ("looking for uniqueid=%llu", fattr->cf_uniqueid));

	/* hash down to 32-bits on 32-bit arch */
	hash = cifs_uniqueid_to_ino_t(fattr->cf_uniqueid);

	inode = iget5_locked(sb, hash, cifs_find_inode, cifs_init_inode, fattr);

	/* we have fattrs in hand, update the inode */
	if (inode) {
		cifs_fattr_to_inode(inode, fattr);
		if (sb->s_flags & MS_NOATIME)
			inode->i_flags |= S_NOATIME | S_NOCMTIME;
		if (inode->i_state & I_NEW) {
			inode->i_ino = hash;
			unlock_new_inode(inode);
		}
	}

	return inode;
}

L
Linus Torvalds 已提交
656
/* gets root inode */
657
struct inode *cifs_root_iget(struct super_block *sb, unsigned long ino)
L
Linus Torvalds 已提交
658
{
659
	int xid;
L
Linus Torvalds 已提交
660
	struct cifs_sb_info *cifs_sb;
661
	struct inode *inode = NULL;
662
	long rc;
663
	char *full_path;
664

665
	cifs_sb = CIFS_SB(sb);
666
	full_path = cifs_build_path_to_root(cifs_sb);
667 668
	if (full_path == NULL)
		return ERR_PTR(-ENOMEM);
669

670
	xid = GetXid();
671
	if (cifs_sb->tcon->unix_ext)
672
		rc = cifs_get_inode_info_unix(&inode, full_path, sb, xid);
673 674
	else
		rc = cifs_get_inode_info(&inode, full_path, NULL, sb,
675
						xid, NULL);
676 677 678

	if (!inode)
		return ERR_PTR(-ENOMEM);
679

680 681 682 683 684 685 686 687
	if (rc && cifs_sb->tcon->ipc) {
		cFYI(1, ("ipc connection - fake read inode"));
		inode->i_mode |= S_IFDIR;
		inode->i_nlink = 2;
		inode->i_op = &cifs_ipc_inode_ops;
		inode->i_fop = &simple_dir_operations;
		inode->i_uid = cifs_sb->mnt_uid;
		inode->i_gid = cifs_sb->mnt_gid;
688
	} else if (rc) {
689
		kfree(full_path);
690 691 692
		_FreeXid(xid);
		iget_failed(inode);
		return ERR_PTR(rc);
693 694
	}

695

696
	kfree(full_path);
697 698 699
	/* can not call macro FreeXid here since in a void func
	 * TODO: This is no longer true
	 */
L
Linus Torvalds 已提交
700
	_FreeXid(xid);
701
	return inode;
L
Linus Torvalds 已提交
702 703
}

704 705 706 707 708 709 710 711 712 713 714 715 716 717 718
static int
cifs_set_file_info(struct inode *inode, struct iattr *attrs, int xid,
		    char *full_path, __u32 dosattr)
{
	int rc;
	int oplock = 0;
	__u16 netfid;
	__u32 netpid;
	bool set_time = false;
	struct cifsFileInfo *open_file;
	struct cifsInodeInfo *cifsInode = CIFS_I(inode);
	struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
	struct cifsTconInfo *pTcon = cifs_sb->tcon;
	FILE_BASIC_INFO	info_buf;

S
Steve French 已提交
719 720 721
	if (attrs == NULL)
		return -EINVAL;

722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770
	if (attrs->ia_valid & ATTR_ATIME) {
		set_time = true;
		info_buf.LastAccessTime =
			cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_atime));
	} else
		info_buf.LastAccessTime = 0;

	if (attrs->ia_valid & ATTR_MTIME) {
		set_time = true;
		info_buf.LastWriteTime =
		    cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_mtime));
	} else
		info_buf.LastWriteTime = 0;

	/*
	 * Samba throws this field away, but windows may actually use it.
	 * Do not set ctime unless other time stamps are changed explicitly
	 * (i.e. by utimes()) since we would then have a mix of client and
	 * server times.
	 */
	if (set_time && (attrs->ia_valid & ATTR_CTIME)) {
		cFYI(1, ("CIFS - CTIME changed"));
		info_buf.ChangeTime =
		    cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_ctime));
	} else
		info_buf.ChangeTime = 0;

	info_buf.CreationTime = 0;	/* don't change */
	info_buf.Attributes = cpu_to_le32(dosattr);

	/*
	 * If the file is already open for write, just use that fileid
	 */
	open_file = find_writable_file(cifsInode);
	if (open_file) {
		netfid = open_file->netfid;
		netpid = open_file->pid;
		goto set_via_filehandle;
	}

	/*
	 * NT4 apparently returns success on this call, but it doesn't
	 * really work.
	 */
	if (!(pTcon->ses->flags & CIFS_SES_NT4)) {
		rc = CIFSSMBSetPathInfo(xid, pTcon, full_path,
				     &info_buf, cifs_sb->local_nls,
				     cifs_sb->mnt_cifs_flags &
					CIFS_MOUNT_MAP_SPECIAL_CHR);
771 772 773 774
		if (rc == 0) {
			cifsInode->cifsAttrs = dosattr;
			goto out;
		} else if (rc != -EOPNOTSUPP && rc != -EINVAL)
775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796
			goto out;
	}

	cFYI(1, ("calling SetFileInfo since SetPathInfo for "
		 "times not supported by this server"));
	rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN,
			 SYNCHRONIZE | FILE_WRITE_ATTRIBUTES,
			 CREATE_NOT_DIR, &netfid, &oplock,
			 NULL, cifs_sb->local_nls,
			 cifs_sb->mnt_cifs_flags &
				CIFS_MOUNT_MAP_SPECIAL_CHR);

	if (rc != 0) {
		if (rc == -EIO)
			rc = -EINVAL;
		goto out;
	}

	netpid = current->tgid;

set_via_filehandle:
	rc = CIFSSMBSetFileInfo(xid, pTcon, &info_buf, netfid, netpid);
797 798 799
	if (!rc)
		cifsInode->cifsAttrs = dosattr;

800 801 802 803 804 805 806 807
	if (open_file == NULL)
		CIFSSMBClose(xid, pTcon, netfid);
	else
		atomic_dec(&open_file->wrtPending);
out:
	return rc;
}

808 809 810 811 812 813
/*
 * open the given file (if it isn't already), set the DELETE_ON_CLOSE bit
 * and rename it to a random name that hopefully won't conflict with
 * anything else.
 */
static int
814
cifs_rename_pending_delete(char *full_path, struct dentry *dentry, int xid)
815 816 817 818
{
	int oplock = 0;
	int rc;
	__u16 netfid;
819
	struct inode *inode = dentry->d_inode;
820 821 822
	struct cifsInodeInfo *cifsInode = CIFS_I(inode);
	struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
	struct cifsTconInfo *tcon = cifs_sb->tcon;
823 824
	__u32 dosattr, origattr;
	FILE_BASIC_INFO *info_buf = NULL;
825 826

	rc = CIFSSMBOpen(xid, tcon, full_path, FILE_OPEN,
827
			 DELETE|FILE_WRITE_ATTRIBUTES, CREATE_NOT_DIR,
828 829 830 831 832
			 &netfid, &oplock, NULL, cifs_sb->local_nls,
			 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
	if (rc != 0)
		goto out;

833 834 835 836 837
	origattr = cifsInode->cifsAttrs;
	if (origattr == 0)
		origattr |= ATTR_NORMAL;

	dosattr = origattr & ~ATTR_READONLY;
838 839 840 841
	if (dosattr == 0)
		dosattr |= ATTR_NORMAL;
	dosattr |= ATTR_HIDDEN;

842 843 844 845 846 847 848 849 850 851 852 853
	/* set ATTR_HIDDEN and clear ATTR_READONLY, but only if needed */
	if (dosattr != origattr) {
		info_buf = kzalloc(sizeof(*info_buf), GFP_KERNEL);
		if (info_buf == NULL) {
			rc = -ENOMEM;
			goto out_close;
		}
		info_buf->Attributes = cpu_to_le32(dosattr);
		rc = CIFSSMBSetFileInfo(xid, tcon, info_buf, netfid,
					current->tgid);
		/* although we would like to mark the file hidden
 		   if that fails we will still try to rename it */
S
Steve French 已提交
854
		if (rc != 0)
855 856 857
			cifsInode->cifsAttrs = dosattr;
		else
			dosattr = origattr; /* since not able to change them */
858 859
	}

860 861
	/* rename the file */
	rc = CIFSSMBRenameOpenFile(xid, tcon, netfid, NULL, cifs_sb->local_nls,
862 863
				   cifs_sb->mnt_cifs_flags &
					    CIFS_MOUNT_MAP_SPECIAL_CHR);
864 865 866 867
	if (rc != 0) {
		rc = -ETXTBSY;
		goto undo_setattr;
	}
868

869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888
	/* try to set DELETE_ON_CLOSE */
	if (!cifsInode->delete_pending) {
		rc = CIFSSMBSetFileDisposition(xid, tcon, true, netfid,
					       current->tgid);
		/*
		 * some samba versions return -ENOENT when we try to set the
		 * file disposition here. Likely a samba bug, but work around
		 * it for now. This means that some cifsXXX files may hang
		 * around after they shouldn't.
		 *
		 * BB: remove this hack after more servers have the fix
		 */
		if (rc == -ENOENT)
			rc = 0;
		else if (rc != 0) {
			rc = -ETXTBSY;
			goto undo_rename;
		}
		cifsInode->delete_pending = true;
	}
889

890 891 892
out_close:
	CIFSSMBClose(xid, tcon, netfid);
out:
893
	kfree(info_buf);
894
	return rc;
895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913

	/*
	 * reset everything back to the original state. Don't bother
	 * dealing with errors here since we can't do anything about
	 * them anyway.
	 */
undo_rename:
	CIFSSMBRenameOpenFile(xid, tcon, netfid, dentry->d_name.name,
				cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
					    CIFS_MOUNT_MAP_SPECIAL_CHR);
undo_setattr:
	if (dosattr != origattr) {
		info_buf->Attributes = cpu_to_le32(origattr);
		if (!CIFSSMBSetFileInfo(xid, tcon, info_buf, netfid,
					current->tgid))
			cifsInode->cifsAttrs = origattr;
	}

	goto out_close;
914 915
}

916 917 918 919 920 921 922 923

/*
 * If dentry->d_inode is null (usually meaning the cached dentry
 * is a negative dentry) then we would attempt a standard SMB delete, but
 * if that fails we can not attempt the fall back mechanisms on EACESS
 * but will return the EACESS to the caller.  Note that the VFS does not call
 * unlink on negative dentries currently.
 */
924
int cifs_unlink(struct inode *dir, struct dentry *dentry)
L
Linus Torvalds 已提交
925 926 927 928
{
	int rc = 0;
	int xid;
	char *full_path = NULL;
929
	struct inode *inode = dentry->d_inode;
930
	struct cifsInodeInfo *cifs_inode;
931 932 933
	struct super_block *sb = dir->i_sb;
	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
	struct cifsTconInfo *tcon = cifs_sb->tcon;
934 935
	struct iattr *attrs = NULL;
	__u32 dosattr = 0, origattr = 0;
L
Linus Torvalds 已提交
936

937
	cFYI(1, ("cifs_unlink, dir=0x%p, dentry=0x%p", dir, dentry));
L
Linus Torvalds 已提交
938 939 940

	xid = GetXid();

941 942 943
	/* Unlink can be called from rename so we can not take the
	 * sb->s_vfs_rename_mutex here */
	full_path = build_path_from_dentry(dentry);
L
Linus Torvalds 已提交
944
	if (full_path == NULL) {
945
		rc = -ENOMEM;
L
Linus Torvalds 已提交
946
		FreeXid(xid);
947
		return rc;
L
Linus Torvalds 已提交
948
	}
949

950
	if ((tcon->ses->capabilities & CAP_UNIX) &&
951
		(CIFS_UNIX_POSIX_PATH_OPS_CAP &
952 953
			le64_to_cpu(tcon->fsUnixInfo.Capability))) {
		rc = CIFSPOSIXDelFile(xid, tcon, full_path,
954
			SMB_POSIX_UNLINK_FILE_TARGET, cifs_sb->local_nls,
955
			cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
956 957 958 959
		cFYI(1, ("posix del rc %d", rc));
		if ((rc == 0) || (rc == -ENOENT))
			goto psx_del_no_retry;
	}
L
Linus Torvalds 已提交
960

961
retry_std_delete:
962
	rc = CIFSSMBDelFile(xid, tcon, full_path, cifs_sb->local_nls,
963
			cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
964

965
psx_del_no_retry:
L
Linus Torvalds 已提交
966
	if (!rc) {
967 968
		if (inode)
			drop_nlink(inode);
L
Linus Torvalds 已提交
969
	} else if (rc == -ENOENT) {
970
		d_drop(dentry);
L
Linus Torvalds 已提交
971
	} else if (rc == -ETXTBSY) {
972
		rc = cifs_rename_pending_delete(full_path, dentry, xid);
973 974
		if (rc == 0)
			drop_nlink(inode);
975
	} else if ((rc == -EACCES) && (dosattr == 0) && inode) {
976 977 978 979
		attrs = kzalloc(sizeof(*attrs), GFP_KERNEL);
		if (attrs == NULL) {
			rc = -ENOMEM;
			goto out_reval;
L
Linus Torvalds 已提交
980
		}
981 982

		/* try to reset dos attributes */
983 984
		cifs_inode = CIFS_I(inode);
		origattr = cifs_inode->cifsAttrs;
985 986 987
		if (origattr == 0)
			origattr |= ATTR_NORMAL;
		dosattr = origattr & ~ATTR_READONLY;
988 989 990 991 992 993 994
		if (dosattr == 0)
			dosattr |= ATTR_NORMAL;
		dosattr |= ATTR_HIDDEN;

		rc = cifs_set_file_info(inode, attrs, xid, full_path, dosattr);
		if (rc != 0)
			goto out_reval;
995 996

		goto retry_std_delete;
L
Linus Torvalds 已提交
997
	}
998 999 1000 1001 1002

	/* undo the setattr if we errored out and it's needed */
	if (rc != 0 && dosattr != 0)
		cifs_set_file_info(inode, attrs, xid, full_path, origattr);

1003
out_reval:
1004
	if (inode) {
1005 1006
		cifs_inode = CIFS_I(inode);
		cifs_inode->time = 0;	/* will force revalidate to get info
1007 1008
					   when needed */
		inode->i_ctime = current_fs_time(sb);
1009
	}
1010
	dir->i_ctime = dir->i_mtime = current_fs_time(sb);
1011
	cifs_inode = CIFS_I(dir);
1012
	CIFS_I(dir)->time = 0;	/* force revalidate of dir as well */
L
Linus Torvalds 已提交
1013 1014

	kfree(full_path);
1015
	kfree(attrs);
L
Linus Torvalds 已提交
1016 1017 1018 1019 1020 1021
	FreeXid(xid);
	return rc;
}

int cifs_mkdir(struct inode *inode, struct dentry *direntry, int mode)
{
1022
	int rc = 0, tmprc;
L
Linus Torvalds 已提交
1023 1024 1025 1026 1027
	int xid;
	struct cifs_sb_info *cifs_sb;
	struct cifsTconInfo *pTcon;
	char *full_path = NULL;
	struct inode *newinode = NULL;
1028
	struct cifs_fattr fattr;
L
Linus Torvalds 已提交
1029

1030
	cFYI(1, ("In cifs_mkdir, mode = 0x%x inode = 0x%p", mode, inode));
L
Linus Torvalds 已提交
1031 1032 1033 1034 1035 1036

	xid = GetXid();

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

1037
	full_path = build_path_from_dentry(direntry);
L
Linus Torvalds 已提交
1038
	if (full_path == NULL) {
1039
		rc = -ENOMEM;
L
Linus Torvalds 已提交
1040
		FreeXid(xid);
1041
		return rc;
L
Linus Torvalds 已提交
1042
	}
1043

S
Steve French 已提交
1044 1045
	if ((pTcon->ses->capabilities & CAP_UNIX) &&
		(CIFS_UNIX_POSIX_PATH_OPS_CAP &
1046 1047
			le64_to_cpu(pTcon->fsUnixInfo.Capability))) {
		u32 oplock = 0;
1048
		FILE_UNIX_BASIC_INFO *pInfo =
1049
			kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
S
Steve French 已提交
1050
		if (pInfo == NULL) {
1051 1052 1053
			rc = -ENOMEM;
			goto mkdir_out;
		}
1054

A
Al Viro 已提交
1055
		mode &= ~current_umask();
1056 1057
		rc = CIFSPOSIXCreate(xid, pTcon, SMB_O_DIRECTORY | SMB_O_CREAT,
				mode, NULL /* netfid */, pInfo, &oplock,
S
Steve French 已提交
1058 1059
				full_path, cifs_sb->local_nls,
				cifs_sb->mnt_cifs_flags &
1060
					CIFS_MOUNT_MAP_SPECIAL_CHR);
1061 1062 1063 1064
		if (rc == -EOPNOTSUPP) {
			kfree(pInfo);
			goto mkdir_retry_old;
		} else if (rc) {
1065 1066 1067
			cFYI(1, ("posix mkdir returned 0x%x", rc));
			d_drop(direntry);
		} else {
1068 1069
			if (pInfo->Type == cpu_to_le32(-1)) {
				/* no return info, go query for it */
1070
				kfree(pInfo);
S
Steve French 已提交
1071
				goto mkdir_get_info;
1072
			}
S
Steve French 已提交
1073 1074
/*BB check (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID ) to see if need
	to set uid/gid */
1075 1076 1077 1078 1079
			inc_nlink(inode);
			if (pTcon->nocase)
				direntry->d_op = &cifs_ci_dentry_ops;
			else
				direntry->d_op = &cifs_dentry_ops;
1080

1081 1082 1083
			cifs_unix_basic_to_fattr(&fattr, pInfo, cifs_sb);
			newinode = cifs_iget(inode->i_sb, &fattr);
			if (!newinode) {
1084
				kfree(pInfo);
1085
				goto mkdir_get_info;
1086
			}
1087

1088
			d_instantiate(direntry, newinode);
1089 1090

#ifdef CONFIG_CIFS_DEBUG2
S
Steve French 已提交
1091
			cFYI(1, ("instantiated dentry %p %s to inode %p",
1092 1093
				direntry, direntry->d_name.name, newinode));

S
Steve French 已提交
1094 1095
			if (newinode->i_nlink != 2)
				cFYI(1, ("unexpected number of links %d",
1096 1097
					newinode->i_nlink));
#endif
1098 1099 1100
		}
		kfree(pInfo);
		goto mkdir_out;
S
Steve French 已提交
1101
	}
1102
mkdir_retry_old:
L
Linus Torvalds 已提交
1103
	/* BB add setting the equivalent of mode via CreateX w/ACLs */
1104 1105
	rc = CIFSSMBMkDir(xid, pTcon, full_path, cifs_sb->local_nls,
			  cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
L
Linus Torvalds 已提交
1106
	if (rc) {
1107
		cFYI(1, ("cifs_mkdir returned 0x%x", rc));
L
Linus Torvalds 已提交
1108 1109
		d_drop(direntry);
	} else {
S
Steve French 已提交
1110
mkdir_get_info:
1111
		inc_nlink(inode);
1112
		if (pTcon->unix_ext)
L
Linus Torvalds 已提交
1113
			rc = cifs_get_inode_info_unix(&newinode, full_path,
S
Steve French 已提交
1114
						      inode->i_sb, xid);
L
Linus Torvalds 已提交
1115 1116
		else
			rc = cifs_get_inode_info(&newinode, full_path, NULL,
1117
						 inode->i_sb, xid, NULL);
L
Linus Torvalds 已提交
1118

1119 1120 1121 1122
		if (pTcon->nocase)
			direntry->d_op = &cifs_ci_dentry_ops;
		else
			direntry->d_op = &cifs_dentry_ops;
L
Linus Torvalds 已提交
1123
		d_instantiate(direntry, newinode);
1124
		 /* setting nlink not necessary except in cases where we
S
Steve French 已提交
1125
		  * failed to get it from the server or was set bogus */
1126
		if ((direntry->d_inode) && (direntry->d_inode->i_nlink < 2))
S
Steve French 已提交
1127
				direntry->d_inode->i_nlink = 2;
1128

A
Al Viro 已提交
1129
		mode &= ~current_umask();
1130 1131 1132 1133
		/* must turn on setgid bit if parent dir has it */
		if (inode->i_mode & S_ISGID)
			mode |= S_ISGID;

1134
		if (pTcon->unix_ext) {
1135 1136 1137 1138 1139 1140 1141
			struct cifs_unix_set_info_args args = {
				.mode	= mode,
				.ctime	= NO_CHANGE_64,
				.atime	= NO_CHANGE_64,
				.mtime	= NO_CHANGE_64,
				.device	= 0,
			};
1142
			if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
1143
				args.uid = (__u64)current_fsuid();
1144 1145 1146
				if (inode->i_mode & S_ISGID)
					args.gid = (__u64)inode->i_gid;
				else
1147
					args.gid = (__u64)current_fsgid();
L
Linus Torvalds 已提交
1148
			} else {
1149 1150
				args.uid = NO_CHANGE_64;
				args.gid = NO_CHANGE_64;
L
Linus Torvalds 已提交
1151
			}
1152 1153 1154 1155
			CIFSSMBUnixSetPathInfo(xid, pTcon, full_path, &args,
					       cifs_sb->local_nls,
					       cifs_sb->mnt_cifs_flags &
						CIFS_MOUNT_MAP_SPECIAL_CHR);
S
Steve French 已提交
1156
		} else {
1157 1158 1159
			if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) &&
			    (mode & S_IWUGO) == 0) {
				FILE_BASIC_INFO pInfo;
1160 1161 1162
				struct cifsInodeInfo *cifsInode;
				u32 dosattrs;

1163
				memset(&pInfo, 0, sizeof(pInfo));
1164 1165 1166 1167 1168 1169
				cifsInode = CIFS_I(newinode);
				dosattrs = cifsInode->cifsAttrs|ATTR_READONLY;
				pInfo.Attributes = cpu_to_le32(dosattrs);
				tmprc = CIFSSMBSetPathInfo(xid, pTcon,
						full_path, &pInfo,
						cifs_sb->local_nls,
1170 1171
						cifs_sb->mnt_cifs_flags &
						CIFS_MOUNT_MAP_SPECIAL_CHR);
1172 1173
				if (tmprc == 0)
					cifsInode->cifsAttrs = dosattrs;
1174
			}
S
Steve French 已提交
1175
			if (direntry->d_inode) {
1176 1177 1178 1179
				if (cifs_sb->mnt_cifs_flags &
				     CIFS_MOUNT_DYNPERM)
					direntry->d_inode->i_mode =
						(mode | S_IFDIR);
S
Steve French 已提交
1180

S
Steve French 已提交
1181
				if (cifs_sb->mnt_cifs_flags &
1182
				     CIFS_MOUNT_SET_UID) {
S
Steve French 已提交
1183
					direntry->d_inode->i_uid =
1184
						current_fsuid();
1185 1186 1187 1188 1189
					if (inode->i_mode & S_ISGID)
						direntry->d_inode->i_gid =
							inode->i_gid;
					else
						direntry->d_inode->i_gid =
1190
							current_fsgid();
1191 1192
				}
			}
1193
		}
L
Linus Torvalds 已提交
1194
	}
S
Steve French 已提交
1195
mkdir_out:
L
Linus Torvalds 已提交
1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209
	kfree(full_path);
	FreeXid(xid);
	return rc;
}

int cifs_rmdir(struct inode *inode, struct dentry *direntry)
{
	int rc = 0;
	int xid;
	struct cifs_sb_info *cifs_sb;
	struct cifsTconInfo *pTcon;
	char *full_path = NULL;
	struct cifsInodeInfo *cifsInode;

1210
	cFYI(1, ("cifs_rmdir, inode = 0x%p", inode));
L
Linus Torvalds 已提交
1211 1212 1213 1214 1215 1216

	xid = GetXid();

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

1217
	full_path = build_path_from_dentry(direntry);
L
Linus Torvalds 已提交
1218
	if (full_path == NULL) {
1219
		rc = -ENOMEM;
L
Linus Torvalds 已提交
1220
		FreeXid(xid);
1221
		return rc;
L
Linus Torvalds 已提交
1222 1223
	}

1224 1225
	rc = CIFSSMBRmDir(xid, pTcon, full_path, cifs_sb->local_nls,
			  cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
L
Linus Torvalds 已提交
1226 1227

	if (!rc) {
1228
		drop_nlink(inode);
1229
		spin_lock(&direntry->d_inode->i_lock);
S
Steve French 已提交
1230
		i_size_write(direntry->d_inode, 0);
1231
		clear_nlink(direntry->d_inode);
1232
		spin_unlock(&direntry->d_inode->i_lock);
L
Linus Torvalds 已提交
1233 1234 1235 1236 1237
	}

	cifsInode = CIFS_I(direntry->d_inode);
	cifsInode->time = 0;	/* force revalidate to go get info when
				   needed */
1238 1239 1240 1241 1242

	cifsInode = CIFS_I(inode);
	cifsInode->time = 0;	/* force revalidate to get parent dir info
				   since cached search results now invalid */

L
Linus Torvalds 已提交
1243 1244 1245 1246 1247 1248 1249 1250
	direntry->d_inode->i_ctime = inode->i_ctime = inode->i_mtime =
		current_fs_time(inode->i_sb);

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

1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290
static int
cifs_do_rename(int xid, struct dentry *from_dentry, const char *fromPath,
		struct dentry *to_dentry, const char *toPath)
{
	struct cifs_sb_info *cifs_sb = CIFS_SB(from_dentry->d_sb);
	struct cifsTconInfo *pTcon = cifs_sb->tcon;
	__u16 srcfid;
	int oplock, rc;

	/* try path-based rename first */
	rc = CIFSSMBRename(xid, pTcon, fromPath, toPath, cifs_sb->local_nls,
			   cifs_sb->mnt_cifs_flags &
				CIFS_MOUNT_MAP_SPECIAL_CHR);

	/*
	 * don't bother with rename by filehandle unless file is busy and
	 * source Note that cross directory moves do not work with
	 * rename by filehandle to various Windows servers.
	 */
	if (rc == 0 || rc != -ETXTBSY)
		return rc;

	/* open the file to be renamed -- we need DELETE perms */
	rc = CIFSSMBOpen(xid, pTcon, fromPath, FILE_OPEN, DELETE,
			 CREATE_NOT_DIR, &srcfid, &oplock, NULL,
			 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
				CIFS_MOUNT_MAP_SPECIAL_CHR);

	if (rc == 0) {
		rc = CIFSSMBRenameOpenFile(xid, pTcon, srcfid,
				(const char *) to_dentry->d_name.name,
				cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
					CIFS_MOUNT_MAP_SPECIAL_CHR);

		CIFSSMBClose(xid, pTcon, srcfid);
	}

	return rc;
}

1291 1292
int cifs_rename(struct inode *source_dir, struct dentry *source_dentry,
	struct inode *target_dir, struct dentry *target_dentry)
L
Linus Torvalds 已提交
1293
{
1294 1295
	char *fromName = NULL;
	char *toName = NULL;
L
Linus Torvalds 已提交
1296 1297
	struct cifs_sb_info *cifs_sb_source;
	struct cifs_sb_info *cifs_sb_target;
1298
	struct cifsTconInfo *tcon;
1299 1300
	FILE_UNIX_BASIC_INFO *info_buf_source = NULL;
	FILE_UNIX_BASIC_INFO *info_buf_target;
1301
	int xid, rc, tmprc;
L
Linus Torvalds 已提交
1302

1303 1304 1305
	cifs_sb_target = CIFS_SB(target_dir->i_sb);
	cifs_sb_source = CIFS_SB(source_dir->i_sb);
	tcon = cifs_sb_source->tcon;
L
Linus Torvalds 已提交
1306

1307 1308 1309 1310 1311 1312
	xid = GetXid();

	/*
	 * BB: this might be allowed if same server, but different share.
	 * Consider adding support for this
	 */
1313
	if (tcon != cifs_sb_target->tcon) {
1314 1315
		rc = -EXDEV;
		goto cifs_rename_exit;
L
Linus Torvalds 已提交
1316 1317
	}

1318 1319 1320 1321
	/*
	 * we already have the rename sem so we do not need to
	 * grab it again here to protect the path integrity
	 */
1322
	fromName = build_path_from_dentry(source_dentry);
1323 1324 1325 1326 1327
	if (fromName == NULL) {
		rc = -ENOMEM;
		goto cifs_rename_exit;
	}

1328
	toName = build_path_from_dentry(target_dentry);
1329
	if (toName == NULL) {
L
Linus Torvalds 已提交
1330 1331 1332 1333
		rc = -ENOMEM;
		goto cifs_rename_exit;
	}

1334 1335
	rc = cifs_do_rename(xid, source_dentry, fromName,
			    target_dentry, toName);
1336

1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350
	if (rc == -EEXIST && tcon->unix_ext) {
		/*
		 * Are src and dst hardlinks of same inode? We can
		 * only tell with unix extensions enabled
		 */
		info_buf_source =
			kmalloc(2 * sizeof(FILE_UNIX_BASIC_INFO),
					GFP_KERNEL);
		if (info_buf_source == NULL) {
			rc = -ENOMEM;
			goto cifs_rename_exit;
		}

		info_buf_target = info_buf_source + 1;
1351
		tmprc = CIFSSMBUnixQPathInfo(xid, tcon, fromName,
1352 1353 1354 1355
					info_buf_source,
					cifs_sb_source->local_nls,
					cifs_sb_source->mnt_cifs_flags &
					CIFS_MOUNT_MAP_SPECIAL_CHR);
1356
		if (tmprc != 0)
1357
			goto unlink_target;
1358

1359
		tmprc = CIFSSMBUnixQPathInfo(xid, tcon,
1360 1361 1362 1363 1364 1365
					toName, info_buf_target,
					cifs_sb_target->local_nls,
					/* remap based on source sb */
					cifs_sb_source->mnt_cifs_flags &
					CIFS_MOUNT_MAP_SPECIAL_CHR);

1366
		if (tmprc == 0 && (info_buf_source->UniqueId ==
1367
				   info_buf_target->UniqueId)) {
1368
			/* same file, POSIX says that this is a noop */
1369
			rc = 0;
1370
			goto cifs_rename_exit;
1371
		}
1372
	} /* else ... BB we could add the same check for Windows by
1373
		     checking the UniqueId via FILE_INTERNAL_INFO */
1374

1375
unlink_target:
1376 1377
	/* Try unlinking the target dentry if it's not negative */
	if (target_dentry->d_inode && (rc == -EACCES || rc == -EEXIST)) {
1378
		tmprc = cifs_unlink(target_dir, target_dentry);
1379 1380 1381 1382 1383
		if (tmprc)
			goto cifs_rename_exit;

		rc = cifs_do_rename(xid, source_dentry, fromName,
				    target_dentry, toName);
L
Linus Torvalds 已提交
1384 1385 1386
	}

cifs_rename_exit:
1387
	kfree(info_buf_source);
L
Linus Torvalds 已提交
1388 1389 1390 1391 1392 1393 1394 1395 1396
	kfree(fromName);
	kfree(toName);
	FreeXid(xid);
	return rc;
}

int cifs_revalidate(struct dentry *direntry)
{
	int xid;
1397
	int rc = 0, wbrc = 0;
L
Linus Torvalds 已提交
1398 1399 1400 1401 1402
	char *full_path;
	struct cifs_sb_info *cifs_sb;
	struct cifsInodeInfo *cifsInode;
	loff_t local_size;
	struct timespec local_mtime;
1403
	bool invalidate_inode = false;
L
Linus Torvalds 已提交
1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422

	if (direntry->d_inode == NULL)
		return -ENOENT;

	cifsInode = CIFS_I(direntry->d_inode);

	if (cifsInode == NULL)
		return -ENOENT;

	/* no sense revalidating inode info on file that no one can write */
	if (CIFS_I(direntry->d_inode)->clientCanCacheRead)
		return rc;

	xid = GetXid();

	cifs_sb = CIFS_SB(direntry->d_sb);

	/* can not safely grab the rename sem here if rename calls revalidate
	   since that would deadlock */
1423
	full_path = build_path_from_dentry(direntry);
L
Linus Torvalds 已提交
1424
	if (full_path == NULL) {
1425
		rc = -ENOMEM;
L
Linus Torvalds 已提交
1426
		FreeXid(xid);
1427
		return rc;
L
Linus Torvalds 已提交
1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451
	}
	cFYI(1, ("Revalidate: %s inode 0x%p count %d dentry: 0x%p d_time %ld "
		 "jiffies %ld", full_path, direntry->d_inode,
		 direntry->d_inode->i_count.counter, direntry,
		 direntry->d_time, jiffies));

	if (cifsInode->time == 0) {
		/* was set to zero previously to force revalidate */
	} else if (time_before(jiffies, cifsInode->time + HZ) &&
		   lookupCacheEnabled) {
		if ((S_ISREG(direntry->d_inode->i_mode) == 0) ||
		    (direntry->d_inode->i_nlink == 1)) {
			kfree(full_path);
			FreeXid(xid);
			return rc;
		} else {
			cFYI(1, ("Have to revalidate file due to hardlinks"));
		}
	}

	/* save mtime and size */
	local_mtime = direntry->d_inode->i_mtime;
	local_size = direntry->d_inode->i_size;

1452
	if (cifs_sb->tcon->unix_ext) {
L
Linus Torvalds 已提交
1453
		rc = cifs_get_inode_info_unix(&direntry->d_inode, full_path,
S
Steve French 已提交
1454
					      direntry->d_sb, xid);
L
Linus Torvalds 已提交
1455 1456 1457 1458 1459 1460 1461 1462
		if (rc) {
			cFYI(1, ("error on getting revalidate info %d", rc));
/*			if (rc != -ENOENT)
				rc = 0; */	/* BB should we cache info on
						   certain errors? */
		}
	} else {
		rc = cifs_get_inode_info(&direntry->d_inode, full_path, NULL,
1463
					 direntry->d_sb, xid, NULL);
L
Linus Torvalds 已提交
1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475
		if (rc) {
			cFYI(1, ("error on getting revalidate info %d", rc));
/*			if (rc != -ENOENT)
				rc = 0; */	/* BB should we cache info on
						   certain errors? */
		}
	}
	/* should we remap certain errors, access denied?, to zero */

	/* if not oplocked, we invalidate inode pages if mtime or file size
	   had changed on server */

S
Steve French 已提交
1476
	if (timespec_equal(&local_mtime, &direntry->d_inode->i_mtime) &&
L
Linus Torvalds 已提交
1477 1478 1479 1480 1481 1482 1483 1484 1485
	    (local_size == direntry->d_inode->i_size)) {
		cFYI(1, ("cifs_revalidate - inode unchanged"));
	} else {
		/* file may have changed on server */
		if (cifsInode->clientCanCacheRead) {
			/* no need to invalidate inode pages since we were the
			   only ones who could have modified the file and the
			   server copy is staler than ours */
		} else {
1486
			invalidate_inode = true;
L
Linus Torvalds 已提交
1487 1488 1489 1490
		}
	}

	/* can not grab this sem since kernel filesys locking documentation
1491 1492 1493
	   indicates i_mutex may be taken by the kernel on lookup and rename
	   which could deadlock if we grab the i_mutex here as well */
/*	mutex_lock(&direntry->d_inode->i_mutex);*/
L
Linus Torvalds 已提交
1494 1495 1496 1497
	/* need to write out dirty pages here  */
	if (direntry->d_inode->i_mapping) {
		/* do we need to lock inode until after invalidate completes
		   below? */
1498 1499 1500
		wbrc = filemap_fdatawrite(direntry->d_inode->i_mapping);
		if (wbrc)
			CIFS_I(direntry->d_inode)->write_behind_rc = wbrc;
L
Linus Torvalds 已提交
1501 1502
	}
	if (invalidate_inode) {
1503 1504
	/* shrink_dcache not necessary now that cifs dentry ops
	are exported for negative dentries */
S
Steve French 已提交
1505
/*		if (S_ISDIR(direntry->d_inode->i_mode))
1506 1507
			shrink_dcache_parent(direntry); */
		if (S_ISREG(direntry->d_inode->i_mode)) {
1508
			if (direntry->d_inode->i_mapping) {
1509 1510 1511
				wbrc = filemap_fdatawait(direntry->d_inode->i_mapping);
				if (wbrc)
					CIFS_I(direntry->d_inode)->write_behind_rc = wbrc;
1512
			}
1513 1514 1515 1516 1517 1518 1519
			/* may eventually have to do this for open files too */
			if (list_empty(&(cifsInode->openFileList))) {
				/* changed on server - flush read ahead pages */
				cFYI(1, ("Invalidating read ahead data on "
					 "closed file"));
				invalidate_remote_inode(direntry->d_inode);
			}
L
Linus Torvalds 已提交
1520 1521
		}
	}
1522
/*	mutex_unlock(&direntry->d_inode->i_mutex); */
1523

L
Linus Torvalds 已提交
1524 1525 1526 1527 1528 1529 1530 1531 1532
	kfree(full_path);
	FreeXid(xid);
	return rc;
}

int cifs_getattr(struct vfsmount *mnt, struct dentry *dentry,
	struct kstat *stat)
{
	int err = cifs_revalidate(dentry);
S
Steve French 已提交
1533
	if (!err) {
L
Linus Torvalds 已提交
1534
		generic_fillattr(dentry->d_inode, stat);
S
Steve French 已提交
1535
		stat->blksize = CIFS_MAX_MSGSIZE;
1536
		stat->ino = CIFS_I(dentry->d_inode)->uniqueid;
S
Steve French 已提交
1537
	}
L
Linus Torvalds 已提交
1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551
	return err;
}

static int cifs_truncate_page(struct address_space *mapping, loff_t from)
{
	pgoff_t index = from >> PAGE_CACHE_SHIFT;
	unsigned offset = from & (PAGE_CACHE_SIZE - 1);
	struct page *page;
	int rc = 0;

	page = grab_cache_page(mapping, index);
	if (!page)
		return -ENOMEM;

1552
	zero_user_segment(page, offset, PAGE_CACHE_SIZE);
L
Linus Torvalds 已提交
1553 1554 1555 1556 1557
	unlock_page(page);
	page_cache_release(page);
	return rc;
}

S
Steve French 已提交
1558
static int cifs_vmtruncate(struct inode *inode, loff_t offset)
1559 1560 1561 1562
{
	struct address_space *mapping = inode->i_mapping;
	unsigned long limit;

1563
	spin_lock(&inode->i_lock);
1564 1565 1566 1567 1568 1569
	if (inode->i_size < offset)
		goto do_expand;
	/*
	 * truncation of in-use swapfiles is disallowed - it would cause
	 * subsequent swapout to scribble on the now-freed blocks.
	 */
1570 1571
	if (IS_SWAPFILE(inode)) {
		spin_unlock(&inode->i_lock);
1572
		goto out_busy;
1573
	}
1574 1575
	i_size_write(inode, offset);
	spin_unlock(&inode->i_lock);
1576 1577 1578 1579 1580 1581 1582 1583
	/*
	 * unmap_mapping_range is called twice, first simply for efficiency
	 * so that truncate_inode_pages does fewer single-page unmaps. However
	 * after this first call, and before truncate_inode_pages finishes,
	 * it is possible for private pages to be COWed, which remain after
	 * truncate_inode_pages finishes, hence the second unmap_mapping_range
	 * call must be made for correctness.
	 */
1584 1585
	unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
	truncate_inode_pages(mapping, offset);
1586
	unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
1587 1588 1589 1590
	goto out_truncate;

do_expand:
	limit = current->signal->rlim[RLIMIT_FSIZE].rlim_cur;
1591 1592
	if (limit != RLIM_INFINITY && offset > limit) {
		spin_unlock(&inode->i_lock);
1593
		goto out_sig;
1594 1595 1596
	}
	if (offset > inode->i_sb->s_maxbytes) {
		spin_unlock(&inode->i_lock);
1597
		goto out_big;
1598
	}
1599
	i_size_write(inode, offset);
1600
	spin_unlock(&inode->i_lock);
1601
out_truncate:
A
Al Viro 已提交
1602
	if (inode->i_op->truncate)
1603 1604 1605 1606 1607 1608 1609 1610 1611 1612
		inode->i_op->truncate(inode);
	return 0;
out_sig:
	send_sig(SIGXFSZ, current, 0);
out_big:
	return -EFBIG;
out_busy:
	return -ETXTBSY;
}

1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681
static int
cifs_set_file_size(struct inode *inode, struct iattr *attrs,
		   int xid, char *full_path)
{
	int rc;
	struct cifsFileInfo *open_file;
	struct cifsInodeInfo *cifsInode = CIFS_I(inode);
	struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
	struct cifsTconInfo *pTcon = cifs_sb->tcon;

	/*
	 * To avoid spurious oplock breaks from server, in the case of
	 * inodes that we already have open, avoid doing path based
	 * setting of file size if we can do it by handle.
	 * This keeps our caching token (oplock) and avoids timeouts
	 * when the local oplock break takes longer to flush
	 * writebehind data than the SMB timeout for the SetPathInfo
	 * request would allow
	 */
	open_file = find_writable_file(cifsInode);
	if (open_file) {
		__u16 nfid = open_file->netfid;
		__u32 npid = open_file->pid;
		rc = CIFSSMBSetFileSize(xid, pTcon, attrs->ia_size, nfid,
					npid, false);
		atomic_dec(&open_file->wrtPending);
		cFYI(1, ("SetFSize for attrs rc = %d", rc));
		if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
			unsigned int bytes_written;
			rc = CIFSSMBWrite(xid, pTcon, nfid, 0, attrs->ia_size,
					  &bytes_written, NULL, NULL, 1);
			cFYI(1, ("Wrt seteof rc %d", rc));
		}
	} else
		rc = -EINVAL;

	if (rc != 0) {
		/* Set file size by pathname rather than by handle
		   either because no valid, writeable file handle for
		   it was found or because there was an error setting
		   it by handle */
		rc = CIFSSMBSetEOF(xid, pTcon, full_path, attrs->ia_size,
				   false, cifs_sb->local_nls,
				   cifs_sb->mnt_cifs_flags &
					CIFS_MOUNT_MAP_SPECIAL_CHR);
		cFYI(1, ("SetEOF by path (setattrs) rc = %d", rc));
		if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
			__u16 netfid;
			int oplock = 0;

			rc = SMBLegacyOpen(xid, pTcon, full_path,
				FILE_OPEN, GENERIC_WRITE,
				CREATE_NOT_DIR, &netfid, &oplock, NULL,
				cifs_sb->local_nls,
				cifs_sb->mnt_cifs_flags &
					CIFS_MOUNT_MAP_SPECIAL_CHR);
			if (rc == 0) {
				unsigned int bytes_written;
				rc = CIFSSMBWrite(xid, pTcon, netfid, 0,
						  attrs->ia_size,
						  &bytes_written, NULL,
						  NULL, 1);
				cFYI(1, ("wrt seteof rc %d", rc));
				CIFSSMBClose(xid, pTcon, netfid);
			}
		}
	}

	if (rc == 0) {
1682
		cifsInode->server_eof = attrs->ia_size;
1683 1684 1685 1686 1687 1688 1689
		rc = cifs_vmtruncate(inode, attrs->ia_size);
		cifs_truncate_page(inode->i_mapping, inode->i_size);
	}

	return rc;
}

1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700
static int
cifs_setattr_unix(struct dentry *direntry, struct iattr *attrs)
{
	int rc;
	int xid;
	char *full_path = NULL;
	struct inode *inode = direntry->d_inode;
	struct cifsInodeInfo *cifsInode = CIFS_I(inode);
	struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
	struct cifsTconInfo *pTcon = cifs_sb->tcon;
	struct cifs_unix_set_info_args *args = NULL;
1701
	struct cifsFileInfo *open_file;
1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722

	cFYI(1, ("setattr_unix on file %s attrs->ia_valid=0x%x",
		 direntry->d_name.name, attrs->ia_valid));

	xid = GetXid();

	if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) == 0) {
		/* check if we have permission to change attrs */
		rc = inode_change_ok(inode, attrs);
		if (rc < 0)
			goto out;
		else
			rc = 0;
	}

	full_path = build_path_from_dentry(direntry);
	if (full_path == NULL) {
		rc = -ENOMEM;
		goto out;
	}

J
Jeff Layton 已提交
1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737
	/*
	 * Attempt to flush data before changing attributes. We need to do
	 * this for ATTR_SIZE and ATTR_MTIME for sure, and if we change the
	 * ownership or mode then we may also need to do this. Here, we take
	 * the safe way out and just do the flush on all setattr requests. If
	 * the flush returns error, store it to report later and continue.
	 *
	 * BB: This should be smarter. Why bother flushing pages that
	 * will be truncated anyway? Also, should we error out here if
	 * the flush returns error?
	 */
	rc = filemap_write_and_wait(inode->i_mapping);
	if (rc != 0) {
		cifsInode->write_behind_rc = rc;
		rc = 0;
1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787
	}

	if (attrs->ia_valid & ATTR_SIZE) {
		rc = cifs_set_file_size(inode, attrs, xid, full_path);
		if (rc != 0)
			goto out;
	}

	/* skip mode change if it's just for clearing setuid/setgid */
	if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
		attrs->ia_valid &= ~ATTR_MODE;

	args = kmalloc(sizeof(*args), GFP_KERNEL);
	if (args == NULL) {
		rc = -ENOMEM;
		goto out;
	}

	/* set up the struct */
	if (attrs->ia_valid & ATTR_MODE)
		args->mode = attrs->ia_mode;
	else
		args->mode = NO_CHANGE_64;

	if (attrs->ia_valid & ATTR_UID)
		args->uid = attrs->ia_uid;
	else
		args->uid = NO_CHANGE_64;

	if (attrs->ia_valid & ATTR_GID)
		args->gid = attrs->ia_gid;
	else
		args->gid = NO_CHANGE_64;

	if (attrs->ia_valid & ATTR_ATIME)
		args->atime = cifs_UnixTimeToNT(attrs->ia_atime);
	else
		args->atime = NO_CHANGE_64;

	if (attrs->ia_valid & ATTR_MTIME)
		args->mtime = cifs_UnixTimeToNT(attrs->ia_mtime);
	else
		args->mtime = NO_CHANGE_64;

	if (attrs->ia_valid & ATTR_CTIME)
		args->ctime = cifs_UnixTimeToNT(attrs->ia_ctime);
	else
		args->ctime = NO_CHANGE_64;

	args->device = 0;
1788 1789 1790 1791 1792 1793 1794 1795
	open_file = find_writable_file(cifsInode);
	if (open_file) {
		u16 nfid = open_file->netfid;
		u32 npid = open_file->pid;
		rc = CIFSSMBUnixSetFileInfo(xid, pTcon, args, nfid, npid);
		atomic_dec(&open_file->wrtPending);
	} else {
		rc = CIFSSMBUnixSetPathInfo(xid, pTcon, full_path, args,
1796 1797 1798
				    cifs_sb->local_nls,
				    cifs_sb->mnt_cifs_flags &
					CIFS_MOUNT_MAP_SPECIAL_CHR);
1799
	}
1800 1801 1802 1803 1804 1805 1806 1807 1808 1809

	if (!rc)
		rc = inode_setattr(inode, attrs);
out:
	kfree(args);
	kfree(full_path);
	FreeXid(xid);
	return rc;
}

1810 1811
static int
cifs_setattr_nounix(struct dentry *direntry, struct iattr *attrs)
L
Linus Torvalds 已提交
1812 1813
{
	int xid;
1814 1815 1816
	struct inode *inode = direntry->d_inode;
	struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
	struct cifsInodeInfo *cifsInode = CIFS_I(inode);
L
Linus Torvalds 已提交
1817 1818
	char *full_path = NULL;
	int rc = -EACCES;
1819
	__u32 dosattr = 0;
1820
	__u64 mode = NO_CHANGE_64;
1821

L
Linus Torvalds 已提交
1822 1823
	xid = GetXid();

1824
	cFYI(1, ("setattr on file %s attrs->iavalid 0x%x",
L
Linus Torvalds 已提交
1825
		 direntry->d_name.name, attrs->ia_valid));
1826

1827
	if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) == 0) {
1828
		/* check if we have permission to change attrs */
1829
		rc = inode_change_ok(inode, attrs);
S
Steve French 已提交
1830
		if (rc < 0) {
1831 1832 1833 1834 1835
			FreeXid(xid);
			return rc;
		} else
			rc = 0;
	}
1836

1837
	full_path = build_path_from_dentry(direntry);
L
Linus Torvalds 已提交
1838
	if (full_path == NULL) {
1839
		rc = -ENOMEM;
L
Linus Torvalds 已提交
1840
		FreeXid(xid);
1841
		return rc;
L
Linus Torvalds 已提交
1842 1843
	}

J
Jeff Layton 已提交
1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858
	/*
	 * Attempt to flush data before changing attributes. We need to do
	 * this for ATTR_SIZE and ATTR_MTIME for sure, and if we change the
	 * ownership or mode then we may also need to do this. Here, we take
	 * the safe way out and just do the flush on all setattr requests. If
	 * the flush returns error, store it to report later and continue.
	 *
	 * BB: This should be smarter. Why bother flushing pages that
	 * will be truncated anyway? Also, should we error out here if
	 * the flush returns error?
	 */
	rc = filemap_write_and_wait(inode->i_mapping);
	if (rc != 0) {
		cifsInode->write_behind_rc = rc;
		rc = 0;
1859
	}
1860

1861
	if (attrs->ia_valid & ATTR_SIZE) {
1862 1863
		rc = cifs_set_file_size(inode, attrs, xid, full_path);
		if (rc != 0)
1864
			goto cifs_setattr_exit;
L
Linus Torvalds 已提交
1865
	}
1866 1867 1868 1869 1870 1871 1872 1873

	/*
	 * Without unix extensions we can't send ownership changes to the
	 * server, so silently ignore them. This is consistent with how
	 * local DOS/Windows filesystems behave (VFAT, NTFS, etc). With
	 * CIFSACL support + proper Windows to Unix idmapping, we may be
	 * able to support this in the future.
	 */
1874
	if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID))
1875
		attrs->ia_valid &= ~(ATTR_UID | ATTR_GID);
L
Linus Torvalds 已提交
1876

1877 1878 1879 1880
	/* skip mode change if it's just for clearing setuid/setgid */
	if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
		attrs->ia_valid &= ~ATTR_MODE;

L
Linus Torvalds 已提交
1881
	if (attrs->ia_valid & ATTR_MODE) {
1882
		cFYI(1, ("Mode changed to 0%o", attrs->ia_mode));
L
Linus Torvalds 已提交
1883 1884 1885
		mode = attrs->ia_mode;
	}

1886
	if (attrs->ia_valid & ATTR_MODE) {
1887
		rc = 0;
1888 1889
#ifdef CONFIG_CIFS_EXPERIMENTAL
		if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
1890
			rc = mode_to_acl(inode, full_path, mode);
1891
		else
1892
#endif
1893 1894
		if (((mode & S_IWUGO) == 0) &&
		    (cifsInode->cifsAttrs & ATTR_READONLY) == 0) {
1895 1896 1897

			dosattr = cifsInode->cifsAttrs | ATTR_READONLY;

1898 1899 1900 1901 1902
			/* fix up mode if we're not using dynperm */
			if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM) == 0)
				attrs->ia_mode = inode->i_mode & ~S_IWUGO;
		} else if ((mode & S_IWUGO) &&
			   (cifsInode->cifsAttrs & ATTR_READONLY)) {
1903 1904 1905 1906 1907

			dosattr = cifsInode->cifsAttrs & ~ATTR_READONLY;
			/* Attributes of 0 are ignored */
			if (dosattr == 0)
				dosattr |= ATTR_NORMAL;
1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921

			/* reset local inode permissions to normal */
			if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) {
				attrs->ia_mode &= ~(S_IALLUGO);
				if (S_ISDIR(inode->i_mode))
					attrs->ia_mode |=
						cifs_sb->mnt_dir_mode;
				else
					attrs->ia_mode |=
						cifs_sb->mnt_file_mode;
			}
		} else if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) {
			/* ignore mode change - ATTR_READONLY hasn't changed */
			attrs->ia_valid &= ~ATTR_MODE;
L
Linus Torvalds 已提交
1922 1923 1924
		}
	}

1925 1926 1927 1928
	if (attrs->ia_valid & (ATTR_MTIME|ATTR_ATIME|ATTR_CTIME) ||
	    ((attrs->ia_valid & ATTR_MODE) && dosattr)) {
		rc = cifs_set_file_info(inode, attrs, xid, full_path, dosattr);
		/* BB: check for rc = -EOPNOTSUPP and switch to legacy mode */
L
Linus Torvalds 已提交
1929

1930 1931 1932 1933 1934
		/* Even if error on time set, no sense failing the call if
		the server would set the time to a reasonable value anyway,
		and this check ensures that we are not being called from
		sys_utimes in which case we ought to fail the call back to
		the user when the server rejects the call */
S
Steve French 已提交
1935
		if ((rc) && (attrs->ia_valid &
1936
				(ATTR_MODE | ATTR_GID | ATTR_UID | ATTR_SIZE)))
1937
			rc = 0;
L
Linus Torvalds 已提交
1938 1939 1940 1941 1942
	}

	/* do not need local check to inode_check_ok since the server does
	   that */
	if (!rc)
1943
		rc = inode_setattr(inode, attrs);
1944
cifs_setattr_exit:
L
Linus Torvalds 已提交
1945 1946 1947 1948 1949
	kfree(full_path);
	FreeXid(xid);
	return rc;
}

1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964
int
cifs_setattr(struct dentry *direntry, struct iattr *attrs)
{
	struct inode *inode = direntry->d_inode;
	struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
	struct cifsTconInfo *pTcon = cifs_sb->tcon;

	if (pTcon->unix_ext)
		return cifs_setattr_unix(direntry, attrs);

	return cifs_setattr_nounix(direntry, attrs);

	/* BB: add cifs_setattr_legacy for really old servers */
}

1965
#if 0
L
Linus Torvalds 已提交
1966 1967
void cifs_delete_inode(struct inode *inode)
{
1968
	cFYI(1, ("In cifs_delete_inode, inode = 0x%p", inode));
L
Linus Torvalds 已提交
1969 1970 1971
	/* may have to add back in if and when safe distributed caching of
	   directories added e.g. via FindNotify */
}
1972
#endif