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inode.c
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inode.c
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/*
* fs/cifs/inode.c
*
* Copyright (C) International Business Machines Corp., 2002,2008
* Author(s): Steve French ([email protected])
*
* This library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
* the GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/fs.h>
#include <linux/stat.h>
#include <linux/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"
static void cifs_set_ops(struct inode *inode, const bool is_dfs_referral)
{
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:
#ifdef CONFIG_CIFS_DFS_UPCALL
if (is_dfs_referral) {
inode->i_op = &cifs_dfs_referral_inode_operations;
} else {
#else /* NO DFS support, treat as a directory */
{
#endif
inode->i_op = &cifs_dir_inode_ops;
inode->i_fop = &cifs_dir_ops;
}
break;
case S_IFLNK:
inode->i_op = &cifs_symlink_inode_ops;
break;
default:
init_special_inode(inode, inode->i_mode, inode->i_rdev);
break;
}
}
static void cifs_unix_info_to_inode(struct inode *inode,
FILE_UNIX_BASIC_INFO *info, int force_uid_gid)
{
struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
struct cifsInodeInfo *cifsInfo = CIFS_I(inode);
__u64 num_of_bytes = le64_to_cpu(info->NumOfBytes);
__u64 end_of_file = le64_to_cpu(info->EndOfFile);
inode->i_atime = cifs_NTtimeToUnix(le64_to_cpu(info->LastAccessTime));
inode->i_mtime =
cifs_NTtimeToUnix(le64_to_cpu(info->LastModificationTime));
inode->i_ctime = cifs_NTtimeToUnix(le64_to_cpu(info->LastStatusChange));
inode->i_mode = le64_to_cpu(info->Permissions);
/*
* Since we set the inode type below we need to mask off
* to avoid strange results if bits set above.
*/
inode->i_mode &= ~S_IFMT;
switch (le32_to_cpu(info->Type)) {
case UNIX_FILE:
inode->i_mode |= S_IFREG;
break;
case UNIX_SYMLINK:
inode->i_mode |= S_IFLNK;
break;
case UNIX_DIR:
inode->i_mode |= S_IFDIR;
break;
case UNIX_CHARDEV:
inode->i_mode |= S_IFCHR;
inode->i_rdev = MKDEV(le64_to_cpu(info->DevMajor),
le64_to_cpu(info->DevMinor) & MINORMASK);
break;
case UNIX_BLOCKDEV:
inode->i_mode |= S_IFBLK;
inode->i_rdev = MKDEV(le64_to_cpu(info->DevMajor),
le64_to_cpu(info->DevMinor) & MINORMASK);
break;
case UNIX_FIFO:
inode->i_mode |= S_IFIFO;
break;
case UNIX_SOCKET:
inode->i_mode |= S_IFSOCK;
break;
default:
/* safest to call it a file if we do not know */
inode->i_mode |= S_IFREG;
cFYI(1, ("unknown type %d", le32_to_cpu(info->Type)));
break;
}
if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID) &&
!force_uid_gid)
inode->i_uid = cifs_sb->mnt_uid;
else
inode->i_uid = le64_to_cpu(info->Uid);
if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID) &&
!force_uid_gid)
inode->i_gid = cifs_sb->mnt_gid;
else
inode->i_gid = le64_to_cpu(info->Gid);
inode->i_nlink = le64_to_cpu(info->Nlinks);
spin_lock(&inode->i_lock);
if (is_size_safe_to_change(cifsInfo, end_of_file)) {
/*
* We 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);
/*
* 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 + num_of_bytes) >> 9;
}
spin_unlock(&inode->i_lock);
}
/*
* Needed to setup inode data for the directory which is the
* junction to the new submount (ie to setup the fake directory
* which represents a DFS referral)
*/
static void fill_fake_finddataunix(FILE_UNIX_BASIC_INFO *pfnd_dat,
struct super_block *sb)
{
struct inode *pinode = NULL;
memset(pfnd_dat, 0, sizeof(FILE_UNIX_BASIC_INFO));
/* __le64 pfnd_dat->EndOfFile = cpu_to_le64(0);
__le64 pfnd_dat->NumOfBytes = cpu_to_le64(0);
__u64 UniqueId = 0; */
pfnd_dat->LastStatusChange =
cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
pfnd_dat->LastAccessTime =
cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
pfnd_dat->LastModificationTime =
cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
pfnd_dat->Type = cpu_to_le32(UNIX_DIR);
pfnd_dat->Permissions = cpu_to_le64(S_IXUGO | S_IRWXU);
pfnd_dat->Nlinks = cpu_to_le64(2);
if (sb->s_root)
pinode = sb->s_root->d_inode;
if (pinode == NULL)
return;
/* fill in default values for the remaining based on root
inode since we can not query the server for this inode info */
pfnd_dat->DevMajor = cpu_to_le64(MAJOR(pinode->i_rdev));
pfnd_dat->DevMinor = cpu_to_le64(MINOR(pinode->i_rdev));
pfnd_dat->Uid = cpu_to_le64(pinode->i_uid);
pfnd_dat->Gid = cpu_to_le64(pinode->i_gid);
}
/**
* cifs_new inode - create new inode, initialize, and hash it
* @sb - pointer to superblock
* @inum - if valid pointer and serverino is enabled, replace i_ino with val
*
* Create a new inode, initialize it for CIFS and hash it. Returns the new
* inode or NULL if one couldn't be allocated.
*
* If the share isn't mounted with "serverino" or inum is a NULL pointer then
* we'll just use the inode number assigned by new_inode(). Note that this can
* mean i_ino collisions since the i_ino assigned by new_inode is not
* guaranteed to be unique.
*/
struct inode *
cifs_new_inode(struct super_block *sb, __u64 *inum)
{
struct inode *inode;
inode = new_inode(sb);
if (inode == NULL)
return NULL;
/*
* BB: Is i_ino == 0 legal? Here, we assume that it is. If it isn't we
* stop passing inum as ptr. Are there sanity checks we can use to
* ensure that the server is really filling in that field? Also,
* if serverino is disabled, perhaps we should be using iunique()?
*/
if (inum && (CIFS_SB(sb)->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM))
inode->i_ino = (unsigned long) *inum;
/*
* must set this here instead of cifs_alloc_inode since VFS will
* clobber i_flags
*/
if (sb->s_flags & MS_NOATIME)
inode->i_flags |= S_NOATIME | S_NOCMTIME;
insert_inode_hash(inode);
return inode;
}
int cifs_get_inode_info_unix(struct inode **pinode,
const unsigned char *full_path, struct super_block *sb, int xid)
{
int rc = 0;
FILE_UNIX_BASIC_INFO find_data;
struct cifsTconInfo *pTcon;
struct inode *inode;
struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
bool is_dfs_referral = false;
struct cifsInodeInfo *cifsInfo;
__u64 num_of_bytes;
__u64 end_of_file;
pTcon = cifs_sb->tcon;
cFYI(1, ("Getting info on %s", full_path));
/* could have done a find first instead but this returns more info */
rc = CIFSSMBUnixQPathInfo(xid, pTcon, full_path, &find_data,
cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
CIFS_MOUNT_MAP_SPECIAL_CHR);
if (rc == -EREMOTE && !is_dfs_referral) {
is_dfs_referral = true;
cFYI(DBG2, ("DFS ref"));
/* for DFS, server does not give us real inode data */
fill_fake_finddataunix(&find_data, sb);
rc = 0;
} else if (rc)
goto cgiiu_exit;
num_of_bytes = le64_to_cpu(find_data.NumOfBytes);
end_of_file = le64_to_cpu(find_data.EndOfFile);
/* get new inode */
if (*pinode == NULL) {
*pinode = cifs_new_inode(sb, &find_data.UniqueId);
if (*pinode == NULL) {
rc = -ENOMEM;
goto cgiiu_exit;
}
}
inode = *pinode;
cifsInfo = CIFS_I(inode);
cFYI(1, ("Old time %ld", cifsInfo->time));
cifsInfo->time = jiffies;
cFYI(1, ("New time %ld", cifsInfo->time));
/* this is ok to set on every inode revalidate */
atomic_set(&cifsInfo->inUse, 1);
cifs_unix_info_to_inode(inode, &find_data, 0);
if (num_of_bytes < end_of_file)
cFYI(1, ("allocation size less than end of file"));
cFYI(1, ("Size %ld and blocks %llu",
(unsigned long) inode->i_size,
(unsigned long long)inode->i_blocks));
cifs_set_ops(inode, is_dfs_referral);
cgiiu_exit:
return rc;
}
static int decode_sfu_inode(struct inode *inode, __u64 size,
const unsigned char *path,
struct cifs_sb_info *cifs_sb, int xid)
{
int rc;
int oplock = 0;
__u16 netfid;
struct cifsTconInfo *pTcon = cifs_sb->tcon;
char buf[24];
unsigned int bytes_read;
char *pbuf;
pbuf = buf;
if (size == 0) {
inode->i_mode |= S_IFIFO;
return 0;
} else if (size < 8) {
return -EINVAL; /* EOPNOTSUPP? */
}
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);
if (rc == 0) {
int buf_type = CIFS_NO_BUFFER;
/* Read header */
rc = CIFSSMBRead(xid, pTcon,
netfid,
24 /* length */, 0 /* offset */,
&bytes_read, &pbuf, &buf_type);
if ((rc == 0) && (bytes_read >= 8)) {
if (memcmp("IntxBLK", pbuf, 8) == 0) {
cFYI(1, ("Block device"));
inode->i_mode |= S_IFBLK;
if (bytes_read == 24) {
/* 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));
inode->i_rdev = MKDEV(mjr, mnr);
}
} else if (memcmp("IntxCHR", pbuf, 8) == 0) {
cFYI(1, ("Char device"));
inode->i_mode |= S_IFCHR;
if (bytes_read == 24) {
/* 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));
inode->i_rdev = MKDEV(mjr, mnr);
}
} else if (memcmp("IntxLNK", pbuf, 7) == 0) {
cFYI(1, ("Symlink"));
inode->i_mode |= S_IFLNK;
} else {
inode->i_mode |= S_IFREG; /* file? */
rc = -EOPNOTSUPP;
}
} else {
inode->i_mode |= S_IFREG; /* then it is a file */
rc = -EOPNOTSUPP; /* or some unknown SFU type */
}
CIFSSMBClose(xid, pTcon, netfid);
}
return rc;
}
#define SFBITS_MASK (S_ISVTX | S_ISGID | S_ISUID) /* SETFILEBITS valid bits */
static int get_sfu_mode(struct inode *inode,
const unsigned char *path,
struct cifs_sb_info *cifs_sb, int xid)
{
#ifdef CONFIG_CIFS_XATTR
ssize_t rc;
char ea_value[4];
__u32 mode;
rc = CIFSSMBQueryEA(xid, cifs_sb->tcon, path, "SETFILEBITS",
ea_value, 4 /* size of buf */, cifs_sb->local_nls,
cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
if (rc < 0)
return (int)rc;
else if (rc > 3) {
mode = le32_to_cpu(*((__le32 *)ea_value));
inode->i_mode &= ~SFBITS_MASK;
cFYI(1, ("special bits 0%o org mode 0%o", mode, inode->i_mode));
inode->i_mode = (mode & SFBITS_MASK) | inode->i_mode;
cFYI(1, ("special mode bits 0%o", mode));
return 0;
} else {
return 0;
}
#else
return -EOPNOTSUPP;
#endif
}
/*
* Needed to setup inode data for the directory which is the
* junction to the new submount (ie to setup the fake directory
* which represents a DFS referral)
*/
static void fill_fake_finddata(FILE_ALL_INFO *pfnd_dat,
struct super_block *sb)
{
memset(pfnd_dat, 0, sizeof(FILE_ALL_INFO));
/* __le64 pfnd_dat->AllocationSize = cpu_to_le64(0);
__le64 pfnd_dat->EndOfFile = cpu_to_le64(0);
__u8 pfnd_dat->DeletePending = 0;
__u8 pfnd_data->Directory = 0;
__le32 pfnd_dat->EASize = 0;
__u64 pfnd_dat->IndexNumber = 0;
__u64 pfnd_dat->IndexNumber1 = 0; */
pfnd_dat->CreationTime =
cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
pfnd_dat->LastAccessTime =
cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
pfnd_dat->LastWriteTime =
cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
pfnd_dat->ChangeTime =
cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
pfnd_dat->Attributes = cpu_to_le32(ATTR_DIRECTORY);
pfnd_dat->NumberOfLinks = cpu_to_le32(2);
}
int cifs_get_inode_info(struct inode **pinode,
const unsigned char *full_path, FILE_ALL_INFO *pfindData,
struct super_block *sb, int xid, const __u16 *pfid)
{
int rc = 0;
__u32 attr;
struct cifsInodeInfo *cifsInfo;
struct cifsTconInfo *pTcon;
struct inode *inode;
struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
char *buf = NULL;
bool adjustTZ = false;
bool is_dfs_referral = false;
umode_t default_mode;
pTcon = cifs_sb->tcon;
cFYI(1, ("Getting info on %s", full_path));
if ((pfindData == NULL) && (*pinode != NULL)) {
if (CIFS_I(*pinode)->clientCanCacheRead) {
cFYI(1, ("No need to revalidate cached inode sizes"));
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, full_path, pfindData,
0 /* not legacy */,
cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
CIFS_MOUNT_MAP_SPECIAL_CHR);
/* 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 */
if ((rc == -EOPNOTSUPP) || (rc == -EINVAL)) {
rc = SMBQueryInformation(xid, pTcon, full_path,
pfindData, cifs_sb->local_nls,
cifs_sb->mnt_cifs_flags &
CIFS_MOUNT_MAP_SPECIAL_CHR);
adjustTZ = true;
}
}
/* dump_mem("\nQPathInfo return data",&findData, sizeof(findData)); */
if (rc == -EREMOTE) {
is_dfs_referral = true;
fill_fake_finddata(pfindData, sb);
rc = 0;
} else if (rc)
goto cgii_exit;
attr = le32_to_cpu(pfindData->Attributes);
/* get new inode */
if (*pinode == NULL) {
__u64 inode_num;
__u64 *pinum = &inode_num;
/* 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. It may not be unique presumably if
the server has multiple devices mounted under one share */
/* There may be higher info levels that work but are
there Windows server or network appliances for which
IndexNumber field is not guaranteed unique? */
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
int rc1 = 0;
rc1 = CIFSGetSrvInodeNumber(xid, pTcon,
full_path, pinum,
cifs_sb->local_nls,
cifs_sb->mnt_cifs_flags &
CIFS_MOUNT_MAP_SPECIAL_CHR);
if (rc1) {
cFYI(1, ("GetSrvInodeNum rc %d", rc1));
pinum = NULL;
/* BB EOPNOSUPP disable SERVER_INUM? */
}
} else {
pinum = NULL;
}
*pinode = cifs_new_inode(sb, pinum);
if (*pinode == NULL) {
rc = -ENOMEM;
goto cgii_exit;
}
}
inode = *pinode;
cifsInfo = CIFS_I(inode);
cifsInfo->cifsAttrs = attr;
cifsInfo->delete_pending = pfindData->DeletePending ? true : false;
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(DBG2, ("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;
}
/* get default inode mode */
if (attr & ATTR_DIRECTORY)
default_mode = cifs_sb->mnt_dir_mode;
else
default_mode = cifs_sb->mnt_file_mode;
/* set permission bits */
if (atomic_read(&cifsInfo->inUse) == 0 ||
(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM) == 0)
inode->i_mode = default_mode;
else {
/* just reenable write bits if !ATTR_READONLY */
if ((inode->i_mode & S_IWUGO) == 0 &&
(attr & ATTR_READONLY) == 0)
inode->i_mode |= (S_IWUGO & default_mode);
inode->i_mode &= ~S_IFMT;
}
/* clear write bits if ATTR_READONLY is set */
if (attr & ATTR_READONLY)
inode->i_mode &= ~S_IWUGO;
/* set inode type */
if ((attr & ATTR_SYSTEM) &&
(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)) {
/* no need to fix endianness on 0 */
if (pfindData->EndOfFile == 0)
inode->i_mode |= S_IFIFO;
else if (decode_sfu_inode(inode,
le64_to_cpu(pfindData->EndOfFile),
full_path, cifs_sb, xid))
cFYI(1, ("unknown SFU file type\n"));
} else {
if (attr & ATTR_DIRECTORY)
inode->i_mode |= S_IFDIR;
else
inode->i_mode |= S_IFREG;
}
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, full_path, pfid);
}
#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, full_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);
}
cifs_set_ops(inode, is_dfs_referral);
cgii_exit:
kfree(buf);
return rc;
}
static const struct inode_operations cifs_ipc_inode_ops = {
.lookup = cifs_lookup,
};
char *cifs_build_path_to_root(struct cifs_sb_info *cifs_sb)
{
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;
}
/* gets root inode */
struct inode *cifs_iget(struct super_block *sb, unsigned long ino)
{
int xid;
struct cifs_sb_info *cifs_sb;
struct inode *inode;
long rc;
char *full_path;
inode = iget_locked(sb, ino);
if (!inode)
return ERR_PTR(-ENOMEM);
if (!(inode->i_state & I_NEW))
return inode;
cifs_sb = CIFS_SB(inode->i_sb);
full_path = cifs_build_path_to_root(cifs_sb);
if (full_path == NULL)
return ERR_PTR(-ENOMEM);
xid = GetXid();
if (cifs_sb->tcon->unix_ext)
rc = cifs_get_inode_info_unix(&inode, full_path, inode->i_sb,
xid);
else
rc = cifs_get_inode_info(&inode, full_path, NULL, inode->i_sb,
xid, NULL);
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;
} else if (rc) {
kfree(full_path);
_FreeXid(xid);
iget_failed(inode);
return ERR_PTR(rc);
}
unlock_new_inode(inode);
kfree(full_path);
/* can not call macro FreeXid here since in a void func
* TODO: This is no longer true
*/
_FreeXid(xid);
return inode;
}
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;
if (attrs == NULL)
return -EINVAL;
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);
if (rc == 0) {
cifsInode->cifsAttrs = dosattr;
goto out;
} else if (rc != -EOPNOTSUPP && rc != -EINVAL)
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);
if (!rc)
cifsInode->cifsAttrs = dosattr;
if (open_file == NULL)
CIFSSMBClose(xid, pTcon, netfid);
else
atomic_dec(&open_file->wrtPending);
out:
return rc;
}
/*
* 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
cifs_rename_pending_delete(char *full_path, struct dentry *dentry, int xid)
{
int oplock = 0;
int rc;
__u16 netfid;
struct inode *inode = dentry->d_inode;
struct cifsInodeInfo *cifsInode = CIFS_I(inode);
struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
struct cifsTconInfo *tcon = cifs_sb->tcon;
__u32 dosattr, origattr;
FILE_BASIC_INFO *info_buf = NULL;
rc = CIFSSMBOpen(xid, tcon, full_path, FILE_OPEN,
DELETE|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)
goto out;
origattr = cifsInode->cifsAttrs;
if (origattr == 0)
origattr |= ATTR_NORMAL;
dosattr = origattr & ~ATTR_READONLY;
if (dosattr == 0)
dosattr |= ATTR_NORMAL;
dosattr |= ATTR_HIDDEN;
/* 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 */
if (rc != 0)
cifsInode->cifsAttrs = dosattr;
else
dosattr = origattr; /* since not able to change them */
}
/* rename the file */
rc = CIFSSMBRenameOpenFile(xid, tcon, netfid, NULL, cifs_sb->local_nls,
cifs_sb->mnt_cifs_flags &
CIFS_MOUNT_MAP_SPECIAL_CHR);
if (rc != 0) {
rc = -ETXTBSY;
goto undo_setattr;
}
/* 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;
}
out_close:
CIFSSMBClose(xid, tcon, netfid);
out:
kfree(info_buf);
return rc;
/*
* 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;
}
int cifs_unlink(struct inode *dir, struct dentry *dentry)
{
int rc = 0;
int xid;
char *full_path = NULL;
struct inode *inode = dentry->d_inode;
struct cifsInodeInfo *cifsInode = CIFS_I(inode);
struct super_block *sb = dir->i_sb;
struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
struct cifsTconInfo *tcon = cifs_sb->tcon;
struct iattr *attrs = NULL;
__u32 dosattr = 0, origattr = 0;
cFYI(1, ("cifs_unlink, dir=0x%p, dentry=0x%p", dir, dentry));
xid = GetXid();
/* 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);
if (full_path == NULL) {
FreeXid(xid);
return -ENOMEM;
}
if ((tcon->ses->capabilities & CAP_UNIX) &&
(CIFS_UNIX_POSIX_PATH_OPS_CAP &
le64_to_cpu(tcon->fsUnixInfo.Capability))) {
rc = CIFSPOSIXDelFile(xid, tcon, 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;
}
retry_std_delete:
rc = CIFSSMBDelFile(xid, tcon, full_path, cifs_sb->local_nls,