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inode.c
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// SPDX-License-Identifier: LGPL-2.1
/*
*
* Copyright (C) International Business Machines Corp., 2002,2010
* Author(s): Steve French (sfrench@us.ibm.com)
*
*/
#include <linux/fs.h>
#include <linux/stat.h>
#include <linux/slab.h>
#include <linux/pagemap.h>
#include <linux/freezer.h>
#include <linux/sched/signal.h>
#include <linux/wait_bit.h>
#include <linux/fiemap.h>
#include <asm/div64.h>
#include "cifsfs.h"
#include "cifspdu.h"
#include "cifsglob.h"
#include "cifsproto.h"
#include "smb2proto.h"
#include "cifs_debug.h"
#include "cifs_fs_sb.h"
#include "cifs_unicode.h"
#include "fscache.h"
#include "fs_context.h"
#include "cifs_ioctl.h"
static void cifs_set_ops(struct inode *inode)
{
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_STRICT_IO) {
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
inode->i_fop = &cifs_file_strict_nobrl_ops;
else
inode->i_fop = &cifs_file_strict_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_master_tcon(cifs_sb)->ses->server->max_read <
PAGE_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_AUTOMOUNT(inode)) {
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;
}
}
/* check inode attributes against fattr. If they don't match, tag the
* inode for cache invalidation
*/
static void
cifs_revalidate_cache(struct inode *inode, struct cifs_fattr *fattr)
{
struct cifsInodeInfo *cifs_i = CIFS_I(inode);
cifs_dbg(FYI, "%s: revalidating inode %llu\n",
__func__, cifs_i->uniqueid);
if (inode->i_state & I_NEW) {
cifs_dbg(FYI, "%s: inode %llu is new\n",
__func__, cifs_i->uniqueid);
return;
}
/* don't bother with revalidation if we have an oplock */
if (CIFS_CACHE_READ(cifs_i)) {
cifs_dbg(FYI, "%s: inode %llu is oplocked\n",
__func__, cifs_i->uniqueid);
return;
}
/* revalidate if mtime or size have changed */
fattr->cf_mtime = timestamp_truncate(fattr->cf_mtime, inode);
if (timespec64_equal(&inode->i_mtime, &fattr->cf_mtime) &&
cifs_i->server_eof == fattr->cf_eof) {
cifs_dbg(FYI, "%s: inode %llu is unchanged\n",
__func__, cifs_i->uniqueid);
return;
}
cifs_dbg(FYI, "%s: invalidating inode %llu mapping\n",
__func__, cifs_i->uniqueid);
set_bit(CIFS_INO_INVALID_MAPPING, &cifs_i->flags);
}
/*
* copy nlink to the inode, unless it wasn't provided. Provide
* sane values if we don't have an existing one and none was provided
*/
static void
cifs_nlink_fattr_to_inode(struct inode *inode, struct cifs_fattr *fattr)
{
/*
* if we're in a situation where we can't trust what we
* got from the server (readdir, some non-unix cases)
* fake reasonable values
*/
if (fattr->cf_flags & CIFS_FATTR_UNKNOWN_NLINK) {
/* only provide fake values on a new inode */
if (inode->i_state & I_NEW) {
if (fattr->cf_cifsattrs & ATTR_DIRECTORY)
set_nlink(inode, 2);
else
set_nlink(inode, 1);
}
return;
}
/* we trust the server, so update it */
set_nlink(inode, fattr->cf_nlink);
}
/* populate an inode with info from a cifs_fattr struct */
int
cifs_fattr_to_inode(struct inode *inode, struct cifs_fattr *fattr)
{
struct cifsInodeInfo *cifs_i = CIFS_I(inode);
struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
if (!(inode->i_state & I_NEW) &&
unlikely(inode_wrong_type(inode, fattr->cf_mode))) {
CIFS_I(inode)->time = 0; /* force reval */
return -ESTALE;
}
cifs_revalidate_cache(inode, fattr);
spin_lock(&inode->i_lock);
fattr->cf_mtime = timestamp_truncate(fattr->cf_mtime, inode);
fattr->cf_atime = timestamp_truncate(fattr->cf_atime, inode);
fattr->cf_ctime = timestamp_truncate(fattr->cf_ctime, inode);
/* we do not want atime to be less than mtime, it broke some apps */
if (timespec64_compare(&fattr->cf_atime, &fattr->cf_mtime) < 0)
inode->i_atime = fattr->cf_mtime;
else
inode->i_atime = fattr->cf_atime;
inode->i_mtime = fattr->cf_mtime;
inode->i_ctime = fattr->cf_ctime;
inode->i_rdev = fattr->cf_rdev;
cifs_nlink_fattr_to_inode(inode, fattr);
inode->i_uid = fattr->cf_uid;
inode->i_gid = fattr->cf_gid;
/* 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;
cifs_i->cifsAttrs = fattr->cf_cifsattrs;
if (fattr->cf_flags & CIFS_FATTR_NEED_REVAL)
cifs_i->time = 0;
else
cifs_i->time = jiffies;
if (fattr->cf_flags & CIFS_FATTR_DELETE_PENDING)
set_bit(CIFS_INO_DELETE_PENDING, &cifs_i->flags);
else
clear_bit(CIFS_INO_DELETE_PENDING, &cifs_i->flags);
cifs_i->server_eof = fattr->cf_eof;
/*
* Can't safely change the file size here if the client is writing to
* it due to potential races.
*/
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);
if (fattr->cf_flags & CIFS_FATTR_DFS_REFERRAL)
inode->i_flags |= S_AUTOMOUNT;
if (inode->i_state & I_NEW)
cifs_set_ops(inode);
return 0;
}
void
cifs_fill_uniqueid(struct super_block *sb, struct cifs_fattr *fattr)
{
struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
return;
fattr->cf_uniqueid = iunique(sb, ROOT_I);
}
/* 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);
/* old POSIX extensions don't get create time */
fattr->cf_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.
*/
fattr->cf_mode &= ~S_IFMT;
switch (le32_to_cpu(info->Type)) {
case UNIX_FILE:
fattr->cf_mode |= S_IFREG;
fattr->cf_dtype = DT_REG;
break;
case UNIX_SYMLINK:
fattr->cf_mode |= S_IFLNK;
fattr->cf_dtype = DT_LNK;
break;
case UNIX_DIR:
fattr->cf_mode |= S_IFDIR;
fattr->cf_dtype = DT_DIR;
break;
case UNIX_CHARDEV:
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);
break;
case UNIX_BLOCKDEV:
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);
break;
case UNIX_FIFO:
fattr->cf_mode |= S_IFIFO;
fattr->cf_dtype = DT_FIFO;
break;
case UNIX_SOCKET:
fattr->cf_mode |= S_IFSOCK;
fattr->cf_dtype = DT_SOCK;
break;
default:
/* safest to call it a file if we do not know */
fattr->cf_mode |= S_IFREG;
fattr->cf_dtype = DT_REG;
cifs_dbg(FYI, "unknown type %d\n", le32_to_cpu(info->Type));
break;
}
fattr->cf_uid = cifs_sb->ctx->linux_uid;
if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)) {
u64 id = le64_to_cpu(info->Uid);
if (id < ((uid_t)-1)) {
kuid_t uid = make_kuid(&init_user_ns, id);
if (uid_valid(uid))
fattr->cf_uid = uid;
}
}
fattr->cf_gid = cifs_sb->ctx->linux_gid;
if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)) {
u64 id = le64_to_cpu(info->Gid);
if (id < ((gid_t)-1)) {
kgid_t gid = make_kgid(&init_user_ns, id);
if (gid_valid(gid))
fattr->cf_gid = gid;
}
}
fattr->cf_nlink = le64_to_cpu(info->Nlinks);
}
/*
* 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).
*/
static void
cifs_create_dfs_fattr(struct cifs_fattr *fattr, struct super_block *sb)
{
struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
cifs_dbg(FYI, "creating fake fattr for DFS referral\n");
memset(fattr, 0, sizeof(*fattr));
fattr->cf_mode = S_IFDIR | S_IXUGO | S_IRWXU;
fattr->cf_uid = cifs_sb->ctx->linux_uid;
fattr->cf_gid = cifs_sb->ctx->linux_gid;
ktime_get_coarse_real_ts64(&fattr->cf_mtime);
fattr->cf_atime = fattr->cf_ctime = fattr->cf_mtime;
fattr->cf_nlink = 2;
fattr->cf_flags = CIFS_FATTR_DFS_REFERRAL;
}
static int
cifs_get_file_info_unix(struct file *filp)
{
int rc;
unsigned int xid;
FILE_UNIX_BASIC_INFO find_data;
struct cifs_fattr fattr;
struct inode *inode = file_inode(filp);
struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
struct cifsFileInfo *cfile = filp->private_data;
struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
xid = get_xid();
rc = CIFSSMBUnixQFileInfo(xid, tcon, cfile->fid.netfid, &find_data);
if (!rc) {
cifs_unix_basic_to_fattr(&fattr, &find_data, cifs_sb);
} else if (rc == -EREMOTE) {
cifs_create_dfs_fattr(&fattr, inode->i_sb);
rc = 0;
} else
goto cifs_gfiunix_out;
rc = cifs_fattr_to_inode(inode, &fattr);
cifs_gfiunix_out:
free_xid(xid);
return rc;
}
int cifs_get_inode_info_unix(struct inode **pinode,
const unsigned char *full_path,
struct super_block *sb, unsigned int xid)
{
int rc;
FILE_UNIX_BASIC_INFO find_data;
struct cifs_fattr fattr;
struct cifs_tcon *tcon;
struct tcon_link *tlink;
struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
cifs_dbg(FYI, "Getting info on %s\n", full_path);
tlink = cifs_sb_tlink(cifs_sb);
if (IS_ERR(tlink))
return PTR_ERR(tlink);
tcon = tlink_tcon(tlink);
/* could have done a find first instead but this returns more info */
rc = CIFSSMBUnixQPathInfo(xid, tcon, full_path, &find_data,
cifs_sb->local_nls, cifs_remap(cifs_sb));
cifs_put_tlink(tlink);
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;
}
/* check for Minshall+French symlinks */
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) {
int tmprc = check_mf_symlink(xid, tcon, cifs_sb, &fattr,
full_path);
if (tmprc)
cifs_dbg(FYI, "check_mf_symlink: %d\n", tmprc);
}
if (*pinode == NULL) {
/* get new inode */
cifs_fill_uniqueid(sb, &fattr);
*pinode = cifs_iget(sb, &fattr);
if (!*pinode)
rc = -ENOMEM;
} else {
/* we already have inode, update it */
/* if uniqueid is different, return error */
if (unlikely(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM &&
CIFS_I(*pinode)->uniqueid != fattr.cf_uniqueid)) {
CIFS_I(*pinode)->time = 0; /* force reval */
rc = -ESTALE;
goto cgiiu_exit;
}
/* if filetype is different, return error */
rc = cifs_fattr_to_inode(*pinode, &fattr);
}
cgiiu_exit:
return rc;
}
static int
cifs_sfu_type(struct cifs_fattr *fattr, const char *path,
struct cifs_sb_info *cifs_sb, unsigned int xid)
{
int rc;
__u32 oplock;
struct tcon_link *tlink;
struct cifs_tcon *tcon;
struct cifs_fid fid;
struct cifs_open_parms oparms;
struct cifs_io_parms io_parms = {0};
char buf[24];
unsigned int bytes_read;
char *pbuf;
int buf_type = CIFS_NO_BUFFER;
pbuf = buf;
fattr->cf_mode &= ~S_IFMT;
if (fattr->cf_eof == 0) {
fattr->cf_mode |= S_IFIFO;
fattr->cf_dtype = DT_FIFO;
return 0;
} else if (fattr->cf_eof < 8) {
fattr->cf_mode |= S_IFREG;
fattr->cf_dtype = DT_REG;
return -EINVAL; /* EOPNOTSUPP? */
}
tlink = cifs_sb_tlink(cifs_sb);
if (IS_ERR(tlink))
return PTR_ERR(tlink);
tcon = tlink_tcon(tlink);
oparms.tcon = tcon;
oparms.cifs_sb = cifs_sb;
oparms.desired_access = GENERIC_READ;
oparms.create_options = cifs_create_options(cifs_sb, CREATE_NOT_DIR);
oparms.disposition = FILE_OPEN;
oparms.path = path;
oparms.fid = &fid;
oparms.reconnect = false;
if (tcon->ses->server->oplocks)
oplock = REQ_OPLOCK;
else
oplock = 0;
rc = tcon->ses->server->ops->open(xid, &oparms, &oplock, NULL);
if (rc) {
cifs_dbg(FYI, "check sfu type of %s, open rc = %d\n", path, rc);
cifs_put_tlink(tlink);
return rc;
}
/* Read header */
io_parms.netfid = fid.netfid;
io_parms.pid = current->tgid;
io_parms.tcon = tcon;
io_parms.offset = 0;
io_parms.length = 24;
rc = tcon->ses->server->ops->sync_read(xid, &fid, &io_parms,
&bytes_read, &pbuf, &buf_type);
if ((rc == 0) && (bytes_read >= 8)) {
if (memcmp("IntxBLK", pbuf, 8) == 0) {
cifs_dbg(FYI, "Block device\n");
fattr->cf_mode |= S_IFBLK;
fattr->cf_dtype = DT_BLK;
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));
fattr->cf_rdev = MKDEV(mjr, mnr);
}
} else if (memcmp("IntxCHR", pbuf, 8) == 0) {
cifs_dbg(FYI, "Char device\n");
fattr->cf_mode |= S_IFCHR;
fattr->cf_dtype = DT_CHR;
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));
fattr->cf_rdev = MKDEV(mjr, mnr);
}
} else if (memcmp("IntxLNK", pbuf, 7) == 0) {
cifs_dbg(FYI, "Symlink\n");
fattr->cf_mode |= S_IFLNK;
fattr->cf_dtype = DT_LNK;
} else {
fattr->cf_mode |= S_IFREG; /* file? */
fattr->cf_dtype = DT_REG;
rc = -EOPNOTSUPP;
}
} else {
fattr->cf_mode |= S_IFREG; /* then it is a file */
fattr->cf_dtype = DT_REG;
rc = -EOPNOTSUPP; /* or some unknown SFU type */
}
tcon->ses->server->ops->close(xid, tcon, &fid);
cifs_put_tlink(tlink);
return rc;
}
#define SFBITS_MASK (S_ISVTX | S_ISGID | S_ISUID) /* SETFILEBITS valid bits */
/*
* 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, unsigned int xid)
{
#ifdef CONFIG_CIFS_XATTR
ssize_t rc;
char ea_value[4];
__u32 mode;
struct tcon_link *tlink;
struct cifs_tcon *tcon;
tlink = cifs_sb_tlink(cifs_sb);
if (IS_ERR(tlink))
return PTR_ERR(tlink);
tcon = tlink_tcon(tlink);
if (tcon->ses->server->ops->query_all_EAs == NULL) {
cifs_put_tlink(tlink);
return -EOPNOTSUPP;
}
rc = tcon->ses->server->ops->query_all_EAs(xid, tcon, path,
"SETFILEBITS", ea_value, 4 /* size of buf */,
cifs_sb);
cifs_put_tlink(tlink);
if (rc < 0)
return (int)rc;
else if (rc > 3) {
mode = le32_to_cpu(*((__le32 *)ea_value));
fattr->cf_mode &= ~SFBITS_MASK;
cifs_dbg(FYI, "special bits 0%o org mode 0%o\n",
mode, fattr->cf_mode);
fattr->cf_mode = (mode & SFBITS_MASK) | fattr->cf_mode;
cifs_dbg(FYI, "special mode bits 0%o\n", mode);
}
return 0;
#else
return -EOPNOTSUPP;
#endif
}
/* Fill a cifs_fattr struct with info from POSIX info struct */
static void
smb311_posix_info_to_fattr(struct cifs_fattr *fattr, struct smb311_posix_qinfo *info,
struct super_block *sb, bool adjust_tz, bool symlink)
{
struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
memset(fattr, 0, sizeof(*fattr));
/* no fattr->flags to set */
fattr->cf_cifsattrs = le32_to_cpu(info->DosAttributes);
fattr->cf_uniqueid = le64_to_cpu(info->Inode);
if (info->LastAccessTime)
fattr->cf_atime = cifs_NTtimeToUnix(info->LastAccessTime);
else
ktime_get_coarse_real_ts64(&fattr->cf_atime);
fattr->cf_ctime = cifs_NTtimeToUnix(info->ChangeTime);
fattr->cf_mtime = cifs_NTtimeToUnix(info->LastWriteTime);
if (adjust_tz) {
fattr->cf_ctime.tv_sec += tcon->ses->server->timeAdj;
fattr->cf_mtime.tv_sec += tcon->ses->server->timeAdj;
}
fattr->cf_eof = le64_to_cpu(info->EndOfFile);
fattr->cf_bytes = le64_to_cpu(info->AllocationSize);
fattr->cf_createtime = le64_to_cpu(info->CreationTime);
fattr->cf_nlink = le32_to_cpu(info->HardLinks);
fattr->cf_mode = (umode_t) le32_to_cpu(info->Mode);
/* The srv fs device id is overridden on network mount so setting rdev isn't needed here */
/* fattr->cf_rdev = le32_to_cpu(info->DeviceId); */
if (symlink) {
fattr->cf_mode |= S_IFLNK;
fattr->cf_dtype = DT_LNK;
} else if (fattr->cf_cifsattrs & ATTR_DIRECTORY) {
fattr->cf_mode |= S_IFDIR;
fattr->cf_dtype = DT_DIR;
} else { /* file */
fattr->cf_mode |= S_IFREG;
fattr->cf_dtype = DT_REG;
}
/* else if reparse point ... TODO: add support for FIFO and blk dev; special file types */
fattr->cf_uid = cifs_sb->ctx->linux_uid; /* TODO: map uid and gid from SID */
fattr->cf_gid = cifs_sb->ctx->linux_gid;
cifs_dbg(FYI, "POSIX query info: mode 0x%x uniqueid 0x%llx nlink %d\n",
fattr->cf_mode, fattr->cf_uniqueid, fattr->cf_nlink);
}
/* Fill a cifs_fattr struct with info from FILE_ALL_INFO */
static void
cifs_all_info_to_fattr(struct cifs_fattr *fattr, FILE_ALL_INFO *info,
struct super_block *sb, bool adjust_tz,
bool symlink, u32 reparse_tag)
{
struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
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
ktime_get_coarse_real_ts64(&fattr->cf_atime);
fattr->cf_ctime = cifs_NTtimeToUnix(info->ChangeTime);
fattr->cf_mtime = cifs_NTtimeToUnix(info->LastWriteTime);
if (adjust_tz) {
fattr->cf_ctime.tv_sec += tcon->ses->server->timeAdj;
fattr->cf_mtime.tv_sec += tcon->ses->server->timeAdj;
}
fattr->cf_eof = le64_to_cpu(info->EndOfFile);
fattr->cf_bytes = le64_to_cpu(info->AllocationSize);
fattr->cf_createtime = le64_to_cpu(info->CreationTime);
fattr->cf_nlink = le32_to_cpu(info->NumberOfLinks);
if (reparse_tag == IO_REPARSE_TAG_LX_SYMLINK) {
fattr->cf_mode |= S_IFLNK | cifs_sb->ctx->file_mode;
fattr->cf_dtype = DT_LNK;
} else if (reparse_tag == IO_REPARSE_TAG_LX_FIFO) {
fattr->cf_mode |= S_IFIFO | cifs_sb->ctx->file_mode;
fattr->cf_dtype = DT_FIFO;
} else if (reparse_tag == IO_REPARSE_TAG_AF_UNIX) {
fattr->cf_mode |= S_IFSOCK | cifs_sb->ctx->file_mode;
fattr->cf_dtype = DT_SOCK;
} else if (reparse_tag == IO_REPARSE_TAG_LX_CHR) {
fattr->cf_mode |= S_IFCHR | cifs_sb->ctx->file_mode;
fattr->cf_dtype = DT_CHR;
} else if (reparse_tag == IO_REPARSE_TAG_LX_BLK) {
fattr->cf_mode |= S_IFBLK | cifs_sb->ctx->file_mode;
fattr->cf_dtype = DT_BLK;
} else if (symlink) { /* TODO add more reparse tag checks */
fattr->cf_mode = S_IFLNK;
fattr->cf_dtype = DT_LNK;
} else if (fattr->cf_cifsattrs & ATTR_DIRECTORY) {
fattr->cf_mode = S_IFDIR | cifs_sb->ctx->dir_mode;
fattr->cf_dtype = DT_DIR;
/*
* Server can return wrong NumberOfLinks value for directories
* when Unix extensions are disabled - fake it.
*/
if (!tcon->unix_ext)
fattr->cf_flags |= CIFS_FATTR_UNKNOWN_NLINK;
} else {
fattr->cf_mode = S_IFREG | cifs_sb->ctx->file_mode;
fattr->cf_dtype = DT_REG;
/* clear write bits if ATTR_READONLY is set */
if (fattr->cf_cifsattrs & ATTR_READONLY)
fattr->cf_mode &= ~(S_IWUGO);
/*
* Don't accept zero nlink from non-unix servers unless
* delete is pending. Instead mark it as unknown.
*/
if ((fattr->cf_nlink < 1) && !tcon->unix_ext &&
!info->DeletePending) {
cifs_dbg(VFS, "bogus file nlink value %u\n",
fattr->cf_nlink);
fattr->cf_flags |= CIFS_FATTR_UNKNOWN_NLINK;
}
}
fattr->cf_uid = cifs_sb->ctx->linux_uid;
fattr->cf_gid = cifs_sb->ctx->linux_gid;
}
static int
cifs_get_file_info(struct file *filp)
{
int rc;
unsigned int xid;
FILE_ALL_INFO find_data;
struct cifs_fattr fattr;
struct inode *inode = file_inode(filp);
struct cifsFileInfo *cfile = filp->private_data;
struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
struct TCP_Server_Info *server = tcon->ses->server;
if (!server->ops->query_file_info)
return -ENOSYS;
xid = get_xid();
rc = server->ops->query_file_info(xid, tcon, &cfile->fid, &find_data);
switch (rc) {
case 0:
/* TODO: add support to query reparse tag */
cifs_all_info_to_fattr(&fattr, &find_data, inode->i_sb, false,
false, 0 /* no reparse tag */);
break;
case -EREMOTE:
cifs_create_dfs_fattr(&fattr, inode->i_sb);
rc = 0;
break;
case -EOPNOTSUPP:
case -EINVAL:
/*
* FIXME: legacy server -- fall back to path-based call?
* for now, just skip revalidating and mark inode for
* immediate reval.
*/
rc = 0;
CIFS_I(inode)->time = 0;
goto cgfi_exit;
default:
goto cgfi_exit;
}
/*
* don't bother with SFU junk here -- just mark inode as needing
* revalidation.
*/
fattr.cf_uniqueid = CIFS_I(inode)->uniqueid;
fattr.cf_flags |= CIFS_FATTR_NEED_REVAL;
/* if filetype is different, return error */
rc = cifs_fattr_to_inode(inode, &fattr);
cgfi_exit:
free_xid(xid);
return rc;
}
/* Simple function to return a 64 bit hash of string. Rarely called */
static __u64 simple_hashstr(const char *str)
{
const __u64 hash_mult = 1125899906842597ULL; /* a big enough prime */
__u64 hash = 0;
while (*str)
hash = (hash + (__u64) *str++) * hash_mult;
return hash;
}
/**
* cifs_backup_query_path_info - SMB1 fallback code to get ino
*
* Fallback code to get file metadata when we don't have access to
* full_path (EACCES) and have backup creds.
*
* @xid: transaction id used to identify original request in logs
* @tcon: information about the server share we have mounted
* @sb: the superblock stores info such as disk space available
* @full_path: name of the file we are getting the metadata for
* @resp_buf: will be set to cifs resp buf and needs to be freed with
* cifs_buf_release() when done with @data
* @data: will be set to search info result buffer
*/
static int
cifs_backup_query_path_info(int xid,
struct cifs_tcon *tcon,
struct super_block *sb,
const char *full_path,
void **resp_buf,
FILE_ALL_INFO **data)
{
struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
struct cifs_search_info info = {0};
u16 flags;
int rc;
*resp_buf = NULL;
info.endOfSearch = false;
if (tcon->unix_ext)
info.info_level = SMB_FIND_FILE_UNIX;
else if ((tcon->ses->capabilities &
tcon->ses->server->vals->cap_nt_find) == 0)
info.info_level = SMB_FIND_FILE_INFO_STANDARD;
else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
info.info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO;
else /* no srvino useful for fallback to some netapp */
info.info_level = SMB_FIND_FILE_DIRECTORY_INFO;
flags = CIFS_SEARCH_CLOSE_ALWAYS |
CIFS_SEARCH_CLOSE_AT_END |
CIFS_SEARCH_BACKUP_SEARCH;
rc = CIFSFindFirst(xid, tcon, full_path,
cifs_sb, NULL, flags, &info, false);
if (rc)
return rc;
*resp_buf = (void *)info.ntwrk_buf_start;
*data = (FILE_ALL_INFO *)info.srch_entries_start;
return 0;
}
static void
cifs_set_fattr_ino(int xid,
struct cifs_tcon *tcon,
struct super_block *sb,
struct inode **inode,
const char *full_path,
FILE_ALL_INFO *data,
struct cifs_fattr *fattr)
{
struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
struct TCP_Server_Info *server = tcon->ses->server;
int rc;
if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
if (*inode)
fattr->cf_uniqueid = CIFS_I(*inode)->uniqueid;
else
fattr->cf_uniqueid = iunique(sb, ROOT_I);
return;
}
/*
* If we have an inode pass a NULL tcon to ensure we don't
* make a round trip to the server. This only works for SMB2+.
*/
rc = server->ops->get_srv_inum(xid,
*inode ? NULL : tcon,
cifs_sb, full_path,
&fattr->cf_uniqueid,
data);
if (rc) {
/*
* If that fails reuse existing ino or generate one
* and disable server ones
*/
if (*inode)
fattr->cf_uniqueid = CIFS_I(*inode)->uniqueid;
else {
fattr->cf_uniqueid = iunique(sb, ROOT_I);
cifs_autodisable_serverino(cifs_sb);
}
return;
}
/* If no errors, check for zero root inode (invalid) */
if (fattr->cf_uniqueid == 0 && strlen(full_path) == 0) {
cifs_dbg(FYI, "Invalid (0) inodenum\n");
if (*inode) {
/* reuse */
fattr->cf_uniqueid = CIFS_I(*inode)->uniqueid;
} else {
/* make an ino by hashing the UNC */
fattr->cf_flags |= CIFS_FATTR_FAKE_ROOT_INO;
fattr->cf_uniqueid = simple_hashstr(tcon->treeName);
}
}
}
static inline bool is_inode_cache_good(struct inode *ino)
{
return ino && CIFS_CACHE_READ(CIFS_I(ino)) && CIFS_I(ino)->time != 0;
}
int
cifs_get_inode_info(struct inode **inode,
const char *full_path,
FILE_ALL_INFO *in_data,
struct super_block *sb, int xid,
const struct cifs_fid *fid)
{
struct cifs_tcon *tcon;
struct TCP_Server_Info *server;
struct tcon_link *tlink;
struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
bool adjust_tz = false;
struct cifs_fattr fattr = {0};
bool is_reparse_point = false;
FILE_ALL_INFO *data = in_data;
FILE_ALL_INFO *tmp_data = NULL;
void *smb1_backup_rsp_buf = NULL;
int rc = 0;
int tmprc = 0;
__u32 reparse_tag = 0;
tlink = cifs_sb_tlink(cifs_sb);
if (IS_ERR(tlink))
return PTR_ERR(tlink);
tcon = tlink_tcon(tlink);
server = tcon->ses->server;
/*
* 1. Fetch file metadata if not provided (data)
*/
if (!data) {
if (is_inode_cache_good(*inode)) {
cifs_dbg(FYI, "No need to revalidate cached inode sizes\n");
goto out;
}
tmp_data = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
if (!tmp_data) {
rc = -ENOMEM;
goto out;
}
rc = server->ops->query_path_info(xid, tcon, cifs_sb,
full_path, tmp_data,
&adjust_tz, &is_reparse_point);
data = tmp_data;
}
/*
* 2. Convert it to internal cifs metadata (fattr)
*/
switch (rc) {
case 0:
/*
* If the file is a reparse point, it is more complicated
* since we have to check if its reparse tag matches a known
* special file type e.g. symlink or fifo or char etc.
*/
if ((le32_to_cpu(data->Attributes) & ATTR_REPARSE) &&
server->ops->query_reparse_tag) {
rc = server->ops->query_reparse_tag(xid, tcon, cifs_sb,
full_path, &reparse_tag);
cifs_dbg(FYI, "reparse tag 0x%x\n", reparse_tag);
}
cifs_all_info_to_fattr(&fattr, data, sb, adjust_tz,
is_reparse_point, reparse_tag);
break;
case -EREMOTE:
/* DFS link, no metadata available on this server */
cifs_create_dfs_fattr(&fattr, sb);
rc = 0;
break;
case -EACCES:
/*
* perm errors, try again with backup flags if possible
*
* For SMB2 and later the backup intent flag
* is already sent if needed on open and there
* is no path based FindFirst operation to use
* to retry with
*/
if (backup_cred(cifs_sb) && is_smb1_server(server)) {
/* for easier reading */
FILE_DIRECTORY_INFO *fdi;
SEARCH_ID_FULL_DIR_INFO *si;
rc = cifs_backup_query_path_info(xid, tcon, sb,
full_path,
&smb1_backup_rsp_buf,
&data);