inode.c

Linux Kernel 2.6.9 for OMAP1710

/*
 *   fs/cifs/inode.c
 *
 *   Copyright (C) International Business Machines  Corp., 2002,2003
 *   Author(s): Steve French ([e-mail])
 *
 *   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/buffer_head.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"

extern int is_size_safe_to_change(struct cifsInodeInfo *);

int
cifs_get_inode_info_unix(struct inode **pinode,
			 const unsigned char *search_path,
			 struct super_block *sb,int xid)
{
	int rc = 0;
	FILE_UNIX_BASIC_INFO findData;
	struct cifsTconInfo *pTcon;
	struct inode *inode;
	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
	char *tmp_path;

	pTcon = cifs_sb->tcon;
	cFYI(1, (" Getting info on %s ", search_path));
	/* we could have done a find first instead but this returns more info */
	rc = CIFSSMBUnixQPathInfo(xid, pTcon, search_path, &findData,
				  cifs_sb->local_nls);
	/* dump_mem("\nUnixQPathInfo return data", &findData, sizeof(findData)); */
	if (rc) {
		if (rc == -EREMOTE) {
			tmp_path =
			    kmalloc(strnlen
				    (pTcon->treeName,
				     MAX_TREE_SIZE + 1) +
				    strnlen(search_path, MAX_PATHCONF) + 1,
				    GFP_KERNEL);
			if (tmp_path == NULL) {
				return -ENOMEM;
			}
        /* have to skip first of the double backslash of UNC name */
			strncpy(tmp_path, pTcon->treeName, MAX_TREE_SIZE);	
			strncat(tmp_path, search_path, MAX_PATHCONF);
			rc = connect_to_dfs_path(xid, pTcon->ses,
						 /* treename + */ tmp_path,
						 cifs_sb->local_nls);
			kfree(tmp_path);

			/* BB fix up inode etc. */
		} else if (rc) {
			return rc;
		}

	} else {
		struct cifsInodeInfo *cifsInfo;
		__u32 type = le32_to_cpu(findData.Type);
		__u64 num_of_bytes = le64_to_cpu(findData.NumOfBytes);
		__u64 end_of_file = le64_to_cpu(findData.EndOfFile);

		/* get new inode */
		if (*pinode == NULL) {
			*pinode = new_inode(sb);
			if(*pinode == NULL) 
				return -ENOMEM;
			insert_inode_hash(*pinode);
		}
			
		inode = *pinode;
		cifsInfo = CIFS_I(inode);

		cFYI(1, (" Old time %ld ", cifsInfo->time));
		cifsInfo->time = jiffies;
		cFYI(1, (" New time %ld ", cifsInfo->time));
		atomic_set(&cifsInfo->inUse,1);	/* ok to set on every refresh of inode */

		inode->i_atime =
		    cifs_NTtimeToUnix(le64_to_cpu(findData.LastAccessTime));
		inode->i_mtime =
		    cifs_NTtimeToUnix(le64_to_cpu
				(findData.LastModificationTime));
		inode->i_ctime =
		    cifs_NTtimeToUnix(le64_to_cpu(findData.LastStatusChange));
		inode->i_mode = le64_to_cpu(findData.Permissions);
		if (type == UNIX_FILE) {
			inode->i_mode |= S_IFREG;
		} else if (type == UNIX_SYMLINK) {
			inode->i_mode |= S_IFLNK;
		} else if (type == UNIX_DIR) {
			inode->i_mode |= S_IFDIR;
		} else if (type == UNIX_CHARDEV) {
			inode->i_mode |= S_IFCHR;
			inode->i_rdev = MKDEV(le64_to_cpu(findData.DevMajor),
				le64_to_cpu(findData.DevMinor) & MINORMASK);
		} else if (type == UNIX_BLOCKDEV) {
			inode->i_mode |= S_IFBLK;
			inode->i_rdev = MKDEV(le64_to_cpu(findData.DevMajor),
				le64_to_cpu(findData.DevMinor) & MINORMASK);
		} else if (type == UNIX_FIFO) {
			inode->i_mode |= S_IFIFO;
		} else if (type == UNIX_SOCKET) {
			inode->i_mode |= S_IFSOCK;
		}
		inode->i_uid = le64_to_cpu(findData.Uid);
		inode->i_gid = le64_to_cpu(findData.Gid);
		inode->i_nlink = le64_to_cpu(findData.Nlinks);

		if(is_size_safe_to_change(cifsInfo)) {
		/* can not safely change the file size here if the 
		   client is writing to it due to potential races */

			i_size_write(inode, end_of_file);
/* 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 */
/*		inode->i_blksize =
		    (pTcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE) & 0xFFFFFE00;*/

		/* This seems incredibly stupid but it turns out that
		i_blocks is not related to (i_size / i_blksize), instead a
		size of 512 is required to be used for calculating num blocks */
		 

/*		inode->i_blocks = 
	                (inode->i_blksize - 1 + num_of_bytes) >> inode->i_blkbits;*/

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

		if (num_of_bytes < end_of_file)
			cFYI(1, ("Server inconsistency Error: it says allocation size less than end of file "));
		cFYI(1,
		     ("Size %ld and blocks %ld ",
		      (unsigned long) inode->i_size, inode->i_blocks));
		if (S_ISREG(inode->i_mode)) {
			cFYI(1, (" File inode "));
			inode->i_op = &cifs_file_inode_ops;
			inode->i_fop = &cifs_file_ops;
			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;
/* tmp_inode->i_fop = *//* do not need to set to anything */
		} else {
			cFYI(1, (" Init special inode "));
			init_special_inode(inode, inode->i_mode,
					   inode->i_rdev);
		}
	}
	return rc;
}

int
cifs_get_inode_info(struct inode **pinode, const unsigned char *search_path, 
		FILE_ALL_INFO * pfindData, struct super_block *sb, int xid)
{
	int rc = 0;
	struct cifsTconInfo *pTcon;
	struct inode *inode;
	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
	char *tmp_path;
	char *buf = NULL;

	pTcon = cifs_sb->tcon;
	cFYI(1,("Getting info on %s ", search_path));

	if((pfindData == NULL) && (*pinode != NULL)) {
		if(CIFS_I(*pinode)->clientCanCacheRead) {
			cFYI(1,("No need to revalidate inode sizes on cached file "));
			return rc;
		}
	}

	/* if file info not passed in then get it from server */
	if(pfindData == NULL) {
		buf = kmalloc(sizeof(FILE_ALL_INFO),GFP_KERNEL);
		if(buf == NULL)
			return -ENOMEM;
		pfindData = (FILE_ALL_INFO *)buf;
	/* could do find first instead but this returns more info */
		rc = CIFSSMBQPathInfo(xid, pTcon, search_path, pfindData,
			      cifs_sb->local_nls);
	}
	/* dump_mem("\nQPathInfo return data",&findData, sizeof(findData)); */
	if (rc) {
		if (rc == -EREMOTE) {
			tmp_path =
			    kmalloc(strnlen
				    (pTcon->treeName,
				     MAX_TREE_SIZE + 1) +
				    strnlen(search_path, MAX_PATHCONF) + 1,
				    GFP_KERNEL);
			if (tmp_path == NULL) {
				if(buf)
					kfree(buf);
				return -ENOMEM;
			}

			strncpy(tmp_path, pTcon->treeName, MAX_TREE_SIZE);
			strncat(tmp_path, search_path, MAX_PATHCONF);
			rc = connect_to_dfs_path(xid, pTcon->ses,
						 /* treename + */ tmp_path,
						 cifs_sb->local_nls);
			kfree(tmp_path);
			/* BB fix up inode etc. */
		} else if (rc) {
			if(buf)
				kfree(buf);
			return rc;
		}
	} else {
		struct cifsInodeInfo *cifsInfo;
		__u32 attr = le32_to_cpu(pfindData->Attributes);

		/* get new inode */
		if (*pinode == NULL) {
			*pinode = new_inode(sb);
			if(*pinode == NULL)
				return -ENOMEM;
			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 */
/*		inode->i_blksize =
		    (pTcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE) & 0xFFFFFE00;*/

		/* Linux can not store file creation time unfortunately so we ignore it */
		inode->i_atime =
		    cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
		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));

		/* 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;

		if (attr & ATTR_REPARSE) {
	/* Can IFLNK be set as it basically is on windows with IFREG or IFDIR? */
			inode->i_mode |= S_IFLNK;
		} else 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 {
			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);
   /* BB add code here - validate if device or weird share or device type? */
		}
		if(is_size_safe_to_change(cifsInfo)) {
		/* can not safely change 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;
		}

		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 */
		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;
			inode->i_fop = &cifs_file_ops;
			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);
		}
	}
	if(buf)
	    kfree(buf);
	return rc;
}

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

	cifs_sb = CIFS_SB(inode->i_sb);
	xid = GetXid();
	if (cifs_sb->tcon->ses->capabilities & CAP_UNIX)
		cifs_get_inode_info_unix(&inode, "", inode->i_sb,xid);
	else
		cifs_get_inode_info(&inode, "", NULL, inode->i_sb,xid);
	/* 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 with ", inode));

	xid = GetXid();

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

/* Unlink can be called from rename so we can not grab
	the sem here since we deadlock otherwise */
/*	down(&direntry->d_sb->s_vfs_rename_sem);*/
	full_path = build_path_from_dentry(direntry);
/*	up(&direntry->d_sb->s_vfs_rename_sem);*/
	if(full_path == NULL) {
		FreeXid(xid);
		return -ENOMEM;
	}
	rc = CIFSSMBDelFile(xid, pTcon, full_path, cifs_sb->local_nls);

	if (!rc) {
		direntry->d_inode->i_nlink--;
	} 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);
		if(rc==0) {
			CIFSSMBRenameOpenFile(xid,pTcon,netfid,
				NULL, cifs_sb->local_nls);
			CIFSSMBClose(xid, pTcon, netfid);
			direntry->d_inode->i_nlink--;
		}
	} else if (rc == -EACCES) {
		/* try only if r/o attribute set in local lookup data? */
		pinfo_buf = (FILE_BASIC_INFO *)kmalloc(sizeof(FILE_BASIC_INFO),GFP_KERNEL);
		if(pinfo_buf) {
			memset(pinfo_buf,0,sizeof(FILE_BASIC_INFO));        
		/* ATTRS set to normal clears r/o bit */
			pinfo_buf->Attributes = cpu_to_le32(ATTR_NORMAL);
			rc = CIFSSMBSetTimes(xid, pTcon, full_path, pinfo_buf,
				cifs_sb->local_nls);
			kfree(pinfo_buf);
		}
		if(rc==0) {
			rc = CIFSSMBDelFile(xid, pTcon, full_path, cifs_sb->local_nls);
			if (!rc) {
				direntry->d_inode->i_nlink--;
			} 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);
				if(rc==0) {
					CIFSSMBRenameOpenFile(xid,pTcon,netfid,NULL,cifs_sb->local_nls);
					CIFSSMBClose(xid, pTcon, netfid);
		                        direntry->d_inode->i_nlink--;
				}
			/* BB if rc = -ETXTBUSY goto the rename logic BB */
			}
		}
	}
	cifsInode = CIFS_I(direntry->d_inode);
	cifsInode->time = 0;	/* will force revalidate to get info when needed */
	direntry->d_inode->i_ctime = inode->i_ctime = inode->i_mtime =
	    CURRENT_TIME;
	cifsInode = CIFS_I(inode);
	cifsInode->time = 0;	/* force revalidate of dir as well */

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

int
cifs_mkdir(struct inode *inode, struct dentry *direntry, int mode)
{
	int rc = 0;
	int xid;
	struct cifs_sb_info *cifs_sb;
	struct cifsTconInfo *pTcon;
	char *full_path = NULL;
	struct inode *newinode = NULL;

	cFYI(1, ("In cifs_mkdir, mode = 0x%x inode = 0x%p ", mode, inode));

	xid = GetXid();

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

	down(&inode->i_sb->s_vfs_rename_sem);
	full_path = build_path_from_dentry(direntry);
	up(&inode->i_sb->s_vfs_rename_sem);
	if(full_path == NULL) {
		FreeXid(xid);
		return -ENOMEM;
	}
	/* BB add setting the equivalent of mode via CreateX w/ACLs */
	rc = CIFSSMBMkDir(xid, pTcon, full_path, cifs_sb->local_nls);
	if (rc) {
		cFYI(1, ("cifs_mkdir returned 0x%x ", rc));
		d_drop(direntry);
	} else {
		inode->i_nlink++;
		if (pTcon->ses->capabilities & CAP_UNIX)
			rc = cifs_get_inode_info_unix(&newinode, full_path,
						      inode->i_sb,xid);
		else
			rc = cifs_get_inode_info(&newinode, full_path,NULL,
						 inode->i_sb,xid);

		direntry->d_op = &cifs_dentry_ops;
		d_instantiate(direntry, newinode);
		if(direntry->d_inode)
			direntry->d_inode->i_nlink = 2;
		if (cifs_sb->tcon->ses->capabilities & CAP_UNIX)
			if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
				CIFSSMBUnixSetPerms(xid, pTcon, full_path, mode,
						(__u64)current->euid,  
						(__u64)current->egid,
						0 /* dev_t */,
						cifs_sb->local_nls);