inode.c

linux 内核源代码

				(*pinode)->i_flags |= S_NOATIME | S_NOCMTIME;
			insert_inode_hash(*pinode);
		}
		inode = *pinode;
		cifsInfo = CIFS_I(inode);
		cifsInfo->cifsAttrs = attr;
		cFYI(1, ("Old time %ld", cifsInfo->time));
		cifsInfo->time = jiffies;
		cFYI(1, ("New time %ld", cifsInfo->time));

		/* blksize needs to be multiple of two. So safer to default to
		blksize and blkbits set in superblock so 2**blkbits and blksize
		will match rather than setting to:
		(pTcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE) & 0xFFFFFE00;*/

		/* Linux can not store file creation time so ignore it */
		if (pfindData->LastAccessTime)
			inode->i_atime = cifs_NTtimeToUnix
				(le64_to_cpu(pfindData->LastAccessTime));
		else /* do not need to use current_fs_time - time not stored */
			inode->i_atime = CURRENT_TIME;
		inode->i_mtime =
		    cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastWriteTime));
		inode->i_ctime =
		    cifs_NTtimeToUnix(le64_to_cpu(pfindData->ChangeTime));
		cFYI(0, ("Attributes came in as 0x%x", attr));
		if (adjustTZ && (pTcon->ses) && (pTcon->ses->server)) {
			inode->i_ctime.tv_sec += pTcon->ses->server->timeAdj;
			inode->i_mtime.tv_sec += pTcon->ses->server->timeAdj;
		}

		/* set default mode. will override for dirs below */
		if (atomic_read(&cifsInfo->inUse) == 0)
			/* new inode, can safely set these fields */
			inode->i_mode = cifs_sb->mnt_file_mode;
		else /* since we set the inode type below we need to mask off
		     to avoid strange results if type changes and both
		     get orred in */
			inode->i_mode &= ~S_IFMT;
/*		if (attr & ATTR_REPARSE)  */
		/* We no longer handle these as symlinks because we could not
		   follow them due to the absolute path with drive letter */
		if (attr & ATTR_DIRECTORY) {
		/* override default perms since we do not do byte range locking
		   on dirs */
			inode->i_mode = cifs_sb->mnt_dir_mode;
			inode->i_mode |= S_IFDIR;
		} else if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) &&
			   (cifsInfo->cifsAttrs & ATTR_SYSTEM) &&
			   /* No need to le64 convert size of zero */
			   (pfindData->EndOfFile == 0)) {
			inode->i_mode = cifs_sb->mnt_file_mode;
			inode->i_mode |= S_IFIFO;
/* BB Finish for SFU style symlinks and devices */
		} else if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) &&
			   (cifsInfo->cifsAttrs & ATTR_SYSTEM)) {
			if (decode_sfu_inode(inode,
					 le64_to_cpu(pfindData->EndOfFile),
					 search_path,
					 cifs_sb, xid)) {
				cFYI(1, ("Unrecognized sfu inode type"));
			}
			cFYI(1, ("sfu mode 0%o", inode->i_mode));
		} else {
			inode->i_mode |= S_IFREG;
			/* treat the dos attribute of read-only as read-only
			   mode e.g. 555 */
			if (cifsInfo->cifsAttrs & ATTR_READONLY)
				inode->i_mode &= ~(S_IWUGO);
			else if ((inode->i_mode & S_IWUGO) == 0)
				/* the ATTR_READONLY flag may have been	*/
				/* changed on server -- set any w bits	*/
				/* allowed by mnt_file_mode		*/
				inode->i_mode |= (S_IWUGO &
						  cifs_sb->mnt_file_mode);
		/* BB add code here -
		   validate if device or weird share or device type? */
		}

		spin_lock(&inode->i_lock);
		if (is_size_safe_to_change(cifsInfo, le64_to_cpu(pfindData->EndOfFile))) {
			/* can not safely shrink the file size here if the
			   client is writing to it due to potential races */
			i_size_write(inode, le64_to_cpu(pfindData->EndOfFile));

			/* 512 bytes (2**9) is the fake blocksize that must be
			   used for this calculation */
			inode->i_blocks = (512 - 1 + le64_to_cpu(
					   pfindData->AllocationSize)) >> 9;
		}
		spin_unlock(&inode->i_lock);

		inode->i_nlink = le32_to_cpu(pfindData->NumberOfLinks);

		/* BB fill in uid and gid here? with help from winbind?
		   or retrieve from NTFS stream extended attribute */
#ifdef CONFIG_CIFS_EXPERIMENTAL
		/* fill in 0777 bits from ACL */
		if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
			cFYI(1, ("Getting mode bits from ACL"));
			acl_to_uid_mode(inode, search_path);
		}
#endif
		if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
			/* fill in remaining high mode bits e.g. SUID, VTX */
			get_sfu_mode(inode, search_path, cifs_sb, xid);
		} else if (atomic_read(&cifsInfo->inUse) == 0) {
			inode->i_uid = cifs_sb->mnt_uid;
			inode->i_gid = cifs_sb->mnt_gid;
			/* set so we do not keep refreshing these fields with
			   bad data after user has changed them in memory */
			atomic_set(&cifsInfo->inUse, 1);
		}

		if (S_ISREG(inode->i_mode)) {
			cFYI(1, ("File inode"));
			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;

			if (pTcon->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;
		} else if (S_ISDIR(inode->i_mode)) {
			cFYI(1, ("Directory inode"));
			inode->i_op = &cifs_dir_inode_ops;
			inode->i_fop = &cifs_dir_ops;
		} else if (S_ISLNK(inode->i_mode)) {
			cFYI(1, ("Symbolic Link inode"));
			inode->i_op = &cifs_symlink_inode_ops;
		} else {
			init_special_inode(inode, inode->i_mode,
					   inode->i_rdev);
		}
	}
	kfree(buf);
	return rc;
}

static const struct inode_operations cifs_ipc_inode_ops = {
	.lookup = cifs_lookup,
};

/* gets root inode */
void cifs_read_inode(struct inode *inode)
{
	int xid, rc;
	struct cifs_sb_info *cifs_sb;

	cifs_sb = CIFS_SB(inode->i_sb);
	xid = GetXid();

	if (cifs_sb->tcon->unix_ext)
		rc = cifs_get_inode_info_unix(&inode, "", inode->i_sb, xid);
	else
		rc = cifs_get_inode_info(&inode, "", NULL, inode->i_sb, xid);
	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;
	}

	/* can not call macro FreeXid here since in a void func */
	_FreeXid(xid);
}

int cifs_unlink(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;
	FILE_BASIC_INFO *pinfo_buf;

	cFYI(1, ("cifs_unlink, inode = 0x%p", inode));

	xid = GetXid();

	if (inode)
		cifs_sb = CIFS_SB(inode->i_sb);
	else
		cifs_sb = CIFS_SB(direntry->d_sb);
	pTcon = cifs_sb->tcon;

	/* Unlink can be called from rename so we can not grab the sem here
	   since we deadlock otherwise */
/*	mutex_lock(&direntry->d_sb->s_vfs_rename_mutex);*/
	full_path = build_path_from_dentry(direntry);
/*	mutex_unlock(&direntry->d_sb->s_vfs_rename_mutex);*/
	if (full_path == NULL) {
		FreeXid(xid);
		return -ENOMEM;
	}

	if ((pTcon->ses->capabilities & CAP_UNIX) &&
		(CIFS_UNIX_POSIX_PATH_OPS_CAP &
			le64_to_cpu(pTcon->fsUnixInfo.Capability))) {
		rc = CIFSPOSIXDelFile(xid, pTcon, full_path,
			SMB_POSIX_UNLINK_FILE_TARGET, cifs_sb->local_nls,
			cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
		cFYI(1, ("posix del rc %d", rc));
		if ((rc == 0) || (rc == -ENOENT))
			goto psx_del_no_retry;
	}

	rc = CIFSSMBDelFile(xid, pTcon, full_path, cifs_sb->local_nls,
			cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
psx_del_no_retry:
	if (!rc) {
		if (direntry->d_inode)
			drop_nlink(direntry->d_inode);
	} else if (rc == -ENOENT) {
		d_drop(direntry);
	} else if (rc == -ETXTBSY) {
		int oplock = FALSE;
		__u16 netfid;

		rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN, DELETE,
				 CREATE_NOT_DIR | CREATE_DELETE_ON_CLOSE,
				 &netfid, &oplock, NULL, cifs_sb->local_nls,
				 cifs_sb->mnt_cifs_flags &
					CIFS_MOUNT_MAP_SPECIAL_CHR);
		if (rc == 0) {
			CIFSSMBRenameOpenFile(xid, pTcon, netfid, NULL,
					      cifs_sb->local_nls,
					      cifs_sb->mnt_cifs_flags &
						CIFS_MOUNT_MAP_SPECIAL_CHR);
			CIFSSMBClose(xid, pTcon, netfid);
			if (direntry->d_inode)
				drop_nlink(direntry->d_inode);
		}
	} else if (rc == -EACCES) {
		/* try only if r/o attribute set in local lookup data? */
		pinfo_buf = kzalloc(sizeof(FILE_BASIC_INFO), GFP_KERNEL);
		if (pinfo_buf) {
			/* ATTRS set to normal clears r/o bit */
			pinfo_buf->Attributes = cpu_to_le32(ATTR_NORMAL);
			if (!(pTcon->ses->flags & CIFS_SES_NT4))
				rc = CIFSSMBSetTimes(xid, pTcon, full_path,
						     pinfo_buf,
						     cifs_sb->local_nls,
						     cifs_sb->mnt_cifs_flags &
							CIFS_MOUNT_MAP_SPECIAL_CHR);
			else
				rc = -EOPNOTSUPP;

			if (rc == -EOPNOTSUPP) {
				int oplock = FALSE;
				__u16 netfid;
			/*	rc = CIFSSMBSetAttrLegacy(xid, pTcon,
							  full_path,
							  (__u16)ATTR_NORMAL,
							  cifs_sb->local_nls);
			   For some strange reason it seems that NT4 eats the
			   old setattr call without actually setting the
			   attributes so on to the third attempted workaround
			   */

			/* BB could scan to see if we already have it open
			   and pass in pid of opener to function */
				rc = CIFSSMBOpen(xid, pTcon, full_path,
						 FILE_OPEN, SYNCHRONIZE |
						 FILE_WRITE_ATTRIBUTES, 0,
						 &netfid, &oplock, NULL,
						 cifs_sb->local_nls,
						 cifs_sb->mnt_cifs_flags &
						    CIFS_MOUNT_MAP_SPECIAL_CHR);
				if (rc == 0) {
					rc = CIFSSMBSetFileTimes(xid, pTcon,
								 pinfo_buf,
								 netfid);
					CIFSSMBClose(xid, pTcon, netfid);
				}
			}
			kfree(pinfo_buf);
		}
		if (rc == 0) {
			rc = CIFSSMBDelFile(xid, pTcon, full_path,
					    cifs_sb->local_nls,
					    cifs_sb->mnt_cifs_flags &
						CIFS_MOUNT_MAP_SPECIAL_CHR);
			if (!rc) {
				if (direntry->d_inode)
					drop_nlink(direntry->d_inode);
			} else if (rc == -ETXTBSY) {
				int oplock = FALSE;
				__u16 netfid;

				rc = CIFSSMBOpen(xid, pTcon, full_path,
						 FILE_OPEN, DELETE,
						 CREATE_NOT_DIR |
						 CREATE_DELETE_ON_CLOSE,
						 &netfid, &oplock, NULL,
						 cifs_sb->local_nls,
						 cifs_sb->mnt_cifs_flags &
						    CIFS_MOUNT_MAP_SPECIAL_CHR);
				if (rc == 0) {
					CIFSSMBRenameOpenFile(xid, pTcon,
						netfid, NULL,
						cifs_sb->local_nls,
						cifs_sb->mnt_cifs_flags &
						    CIFS_MOUNT_MAP_SPECIAL_CHR);
					CIFSSMBClose(xid, pTcon, netfid);
					if (direntry->d_inode)
						drop_nlink(direntry->d_inode);
				}
			/* BB if rc = -ETXTBUSY goto the rename logic BB */
			}
		}
	}
	if (direntry->d_inode) {
		cifsInode = CIFS_I(direntry->d_inode);
		cifsInode->time = 0;	/* will force revalidate to get info
					   when needed */
		direntry->d_inode->i_ctime = current_fs_time(inode->i_sb);
	}
	if (inode) {
		inode->i_ctime = inode->i_mtime = current_fs_time(inode->i_sb);
		cifsInode = CIFS_I(inode);
		cifsInode->time = 0;	/* force revalidate of dir as well */
	}

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

static void posix_fill_in_inode(struct inode *tmp_inode,
	FILE_UNIX_BASIC_INFO *pData, int *pobject_type, int isNewInode)
{
	loff_t local_size;
	struct timespec local_mtime;

	struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
	struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);

	__u32 type = le32_to_cpu(pData->Type);
	__u64 num_of_bytes = le64_to_cpu(pData->NumOfBytes);
	__u64 end_of_file = le64_to_cpu(pData->EndOfFile);
	cifsInfo->time = jiffies;
	atomic_inc(&cifsInfo->inUse);

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

	tmp_inode->i_atime =
	    cifs_NTtimeToUnix(le64_to_cpu(pData->LastAccessTime));
	tmp_inode->i_mtime =
	    cifs_NTtimeToUnix(le64_to_cpu(pData->LastModificationTime));
	tmp_inode->i_ctime =
	    cifs_NTtimeToUnix(le64_to_cpu(pData->LastStatusChange));

	tmp_inode->i_mode = le64_to_cpu(pData->Permissions);
	/* since we set the inode type below we need to mask off type
	   to avoid strange results if bits above were corrupt */
	tmp_inode->i_mode &= ~S_IFMT;
	if (type == UNIX_FILE) {
		*pobject_type = DT_REG;
		tmp_inode->i_mode |= S_IFREG;
	} else if (type == UNIX_SYMLINK) {
		*pobject_type = DT_LNK;
		tmp_inode->i_mode |= S_IFLNK;
	} else if (type == UNIX_DIR) {
		*pobject_type = DT_DIR;
		tmp_inode->i_mode |= S_IFDIR;
	} else if (type == UNIX_CHARDEV) {
		*pobject_type = DT_CHR;
		tmp_inode->i_mode |= S_IFCHR;
		tmp_inode->i_rdev = MKDEV(le64_to_cpu(pData->DevMajor),
				le64_to_cpu(pData->DevMinor) & MINORMASK);
	} else if (type == UNIX_BLOCKDEV) {
		*pobject_type = DT_BLK;
		tmp_inode->i_mode |= S_IFBLK;
		tmp_inode->i_rdev = MKDEV(le64_to_cpu(pData->DevMajor),
				le64_to_cpu(pData->DevMinor) & MINORMASK);
	} else if (type == UNIX_FIFO) {
		*pobject_type = DT_FIFO;
		tmp_inode->i_mode |= S_IFIFO;
	} else if (type == UNIX_SOCKET) {
		*pobject_type = DT_SOCK;
		tmp_inode->i_mode |= S_IFSOCK;
	} else {
		/* safest to just call it a file */
		*pobject_type = DT_REG;
		tmp_inode->i_mode |= S_IFREG;
		cFYI(1, ("unknown inode type %d", type));
	}

#ifdef CONFIG_CIFS_DEBUG2
	cFYI(1, ("object type: %d", type));
#endif
	tmp_inode->i_uid = le64_to_cpu(pData->Uid);
	tmp_inode->i_gid = le64_to_cpu(pData->Gid);
	tmp_inode->i_nlink = le64_to_cpu(pData->Nlinks);

	spin_lock(&tmp_inode->i_lock);
	if (is_size_safe_to_change(cifsInfo, end_of_file)) {
		/* can not safely change the file size here if the
		client is writing to it due to potential races */
		i_size_write(tmp_inode, end_of_file);

	/* 512 bytes (2**9) is the fake blocksize that must be used */
	/* for this calculation, not the real blocksize */
		tmp_inode->i_blocks = (512 - 1 + num_of_bytes) >> 9;
	}
	spin_unlock(&tmp_inode->i_lock);

	if (S_ISREG(tmp_inode->i_mode)) {
		cFYI(1, ("File inode"));
		tmp_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)
				tmp_inode->i_fop = &cifs_file_direct_nobrl_ops;
			else
				tmp_inode->i_fop = &cifs_file_direct_ops;