mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-28 20:02:17 +00:00
![Steve French](/assets/img/avatar_default.png)
checkpatch complains about source files with filenames (e.g. in these cases just below the SPDX header in comments at the top of various files in fs/cifs). It also is helpful to change this now so will be less confusing when the parent directory is renamed e.g. from fs/cifs to fs/smb_client (or fs/smbfs) Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com> Signed-off-by: Steve French <stfrench@microsoft.com>
1056 lines
30 KiB
C
1056 lines
30 KiB
C
// SPDX-License-Identifier: LGPL-2.1
|
|
/*
|
|
*
|
|
* Directory search handling
|
|
*
|
|
* Copyright (C) International Business Machines Corp., 2004, 2008
|
|
* Copyright (C) Red Hat, Inc., 2011
|
|
* Author(s): Steve French (sfrench@us.ibm.com)
|
|
*
|
|
*/
|
|
#include <linux/fs.h>
|
|
#include <linux/pagemap.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/stat.h>
|
|
#include "cifspdu.h"
|
|
#include "cifsglob.h"
|
|
#include "cifsproto.h"
|
|
#include "cifs_unicode.h"
|
|
#include "cifs_debug.h"
|
|
#include "cifs_fs_sb.h"
|
|
#include "cifsfs.h"
|
|
#include "smb2proto.h"
|
|
#include "fs_context.h"
|
|
|
|
/*
|
|
* To be safe - for UCS to UTF-8 with strings loaded with the rare long
|
|
* characters alloc more to account for such multibyte target UTF-8
|
|
* characters.
|
|
*/
|
|
#define UNICODE_NAME_MAX ((4 * NAME_MAX) + 2)
|
|
|
|
#ifdef CONFIG_CIFS_DEBUG2
|
|
static void dump_cifs_file_struct(struct file *file, char *label)
|
|
{
|
|
struct cifsFileInfo *cf;
|
|
|
|
if (file) {
|
|
cf = file->private_data;
|
|
if (cf == NULL) {
|
|
cifs_dbg(FYI, "empty cifs private file data\n");
|
|
return;
|
|
}
|
|
if (cf->invalidHandle)
|
|
cifs_dbg(FYI, "Invalid handle\n");
|
|
if (cf->srch_inf.endOfSearch)
|
|
cifs_dbg(FYI, "end of search\n");
|
|
if (cf->srch_inf.emptyDir)
|
|
cifs_dbg(FYI, "empty dir\n");
|
|
}
|
|
}
|
|
#else
|
|
static inline void dump_cifs_file_struct(struct file *file, char *label)
|
|
{
|
|
}
|
|
#endif /* DEBUG2 */
|
|
|
|
/*
|
|
* Attempt to preload the dcache with the results from the FIND_FIRST/NEXT
|
|
*
|
|
* Find the dentry that matches "name". If there isn't one, create one. If it's
|
|
* a negative dentry or the uniqueid or filetype(mode) changed,
|
|
* then drop it and recreate it.
|
|
*/
|
|
static void
|
|
cifs_prime_dcache(struct dentry *parent, struct qstr *name,
|
|
struct cifs_fattr *fattr)
|
|
{
|
|
struct dentry *dentry, *alias;
|
|
struct inode *inode;
|
|
struct super_block *sb = parent->d_sb;
|
|
struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
|
|
DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq);
|
|
|
|
cifs_dbg(FYI, "%s: for %s\n", __func__, name->name);
|
|
|
|
dentry = d_hash_and_lookup(parent, name);
|
|
if (!dentry) {
|
|
/*
|
|
* If we know that the inode will need to be revalidated
|
|
* immediately, then don't create a new dentry for it.
|
|
* We'll end up doing an on the wire call either way and
|
|
* this spares us an invalidation.
|
|
*/
|
|
if (fattr->cf_flags & CIFS_FATTR_NEED_REVAL)
|
|
return;
|
|
retry:
|
|
dentry = d_alloc_parallel(parent, name, &wq);
|
|
}
|
|
if (IS_ERR(dentry))
|
|
return;
|
|
if (!d_in_lookup(dentry)) {
|
|
inode = d_inode(dentry);
|
|
if (inode) {
|
|
if (d_mountpoint(dentry)) {
|
|
dput(dentry);
|
|
return;
|
|
}
|
|
/*
|
|
* If we're generating inode numbers, then we don't
|
|
* want to clobber the existing one with the one that
|
|
* the readdir code created.
|
|
*/
|
|
if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM))
|
|
fattr->cf_uniqueid = CIFS_I(inode)->uniqueid;
|
|
|
|
/* update inode in place
|
|
* if both i_ino and i_mode didn't change */
|
|
if (CIFS_I(inode)->uniqueid == fattr->cf_uniqueid &&
|
|
cifs_fattr_to_inode(inode, fattr) == 0) {
|
|
dput(dentry);
|
|
return;
|
|
}
|
|
}
|
|
d_invalidate(dentry);
|
|
dput(dentry);
|
|
goto retry;
|
|
} else {
|
|
inode = cifs_iget(sb, fattr);
|
|
if (!inode)
|
|
inode = ERR_PTR(-ENOMEM);
|
|
alias = d_splice_alias(inode, dentry);
|
|
d_lookup_done(dentry);
|
|
if (alias && !IS_ERR(alias))
|
|
dput(alias);
|
|
}
|
|
dput(dentry);
|
|
}
|
|
|
|
static bool reparse_file_needs_reval(const struct cifs_fattr *fattr)
|
|
{
|
|
if (!(fattr->cf_cifsattrs & ATTR_REPARSE))
|
|
return false;
|
|
/*
|
|
* The DFS tags should be only intepreted by server side as per
|
|
* MS-FSCC 2.1.2.1, but let's include them anyway.
|
|
*
|
|
* Besides, if cf_cifstag is unset (0), then we still need it to be
|
|
* revalidated to know exactly what reparse point it is.
|
|
*/
|
|
switch (fattr->cf_cifstag) {
|
|
case IO_REPARSE_TAG_DFS:
|
|
case IO_REPARSE_TAG_DFSR:
|
|
case IO_REPARSE_TAG_SYMLINK:
|
|
case IO_REPARSE_TAG_NFS:
|
|
case 0:
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
static void
|
|
cifs_fill_common_info(struct cifs_fattr *fattr, struct cifs_sb_info *cifs_sb)
|
|
{
|
|
fattr->cf_uid = cifs_sb->ctx->linux_uid;
|
|
fattr->cf_gid = cifs_sb->ctx->linux_gid;
|
|
|
|
/*
|
|
* The IO_REPARSE_TAG_LX_ tags originally were used by WSL but they
|
|
* are preferred by the Linux client in some cases since, unlike
|
|
* the NFS reparse tag (or EAs), they don't require an extra query
|
|
* to determine which type of special file they represent.
|
|
* TODO: go through all documented reparse tags to see if we can
|
|
* reasonably map some of them to directories vs. files vs. symlinks
|
|
*/
|
|
if (fattr->cf_cifsattrs & ATTR_DIRECTORY) {
|
|
fattr->cf_mode = S_IFDIR | cifs_sb->ctx->dir_mode;
|
|
fattr->cf_dtype = DT_DIR;
|
|
} else if (fattr->cf_cifstag == IO_REPARSE_TAG_LX_SYMLINK) {
|
|
fattr->cf_mode |= S_IFLNK | cifs_sb->ctx->file_mode;
|
|
fattr->cf_dtype = DT_LNK;
|
|
} else if (fattr->cf_cifstag == IO_REPARSE_TAG_LX_FIFO) {
|
|
fattr->cf_mode |= S_IFIFO | cifs_sb->ctx->file_mode;
|
|
fattr->cf_dtype = DT_FIFO;
|
|
} else if (fattr->cf_cifstag == IO_REPARSE_TAG_AF_UNIX) {
|
|
fattr->cf_mode |= S_IFSOCK | cifs_sb->ctx->file_mode;
|
|
fattr->cf_dtype = DT_SOCK;
|
|
} else if (fattr->cf_cifstag == IO_REPARSE_TAG_LX_CHR) {
|
|
fattr->cf_mode |= S_IFCHR | cifs_sb->ctx->file_mode;
|
|
fattr->cf_dtype = DT_CHR;
|
|
} else if (fattr->cf_cifstag == IO_REPARSE_TAG_LX_BLK) {
|
|
fattr->cf_mode |= S_IFBLK | cifs_sb->ctx->file_mode;
|
|
fattr->cf_dtype = DT_BLK;
|
|
} else { /* TODO: should we mark some other reparse points (like DFSR) as directories? */
|
|
fattr->cf_mode = S_IFREG | cifs_sb->ctx->file_mode;
|
|
fattr->cf_dtype = DT_REG;
|
|
}
|
|
|
|
/*
|
|
* We need to revalidate it further to make a decision about whether it
|
|
* is a symbolic link, DFS referral or a reparse point with a direct
|
|
* access like junctions, deduplicated files, NFS symlinks.
|
|
*/
|
|
if (reparse_file_needs_reval(fattr))
|
|
fattr->cf_flags |= CIFS_FATTR_NEED_REVAL;
|
|
|
|
/* non-unix readdir doesn't provide nlink */
|
|
fattr->cf_flags |= CIFS_FATTR_UNKNOWN_NLINK;
|
|
|
|
if (fattr->cf_cifsattrs & ATTR_READONLY)
|
|
fattr->cf_mode &= ~S_IWUGO;
|
|
|
|
/*
|
|
* We of course don't get ACL info in FIND_FIRST/NEXT results, so
|
|
* mark it for revalidation so that "ls -l" will look right. It might
|
|
* be super-slow, but if we don't do this then the ownership of files
|
|
* may look wrong since the inodes may not have timed out by the time
|
|
* "ls" does a stat() call on them.
|
|
*/
|
|
if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) ||
|
|
(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID))
|
|
fattr->cf_flags |= CIFS_FATTR_NEED_REVAL;
|
|
|
|
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL &&
|
|
fattr->cf_cifsattrs & ATTR_SYSTEM) {
|
|
if (fattr->cf_eof == 0) {
|
|
fattr->cf_mode &= ~S_IFMT;
|
|
fattr->cf_mode |= S_IFIFO;
|
|
fattr->cf_dtype = DT_FIFO;
|
|
} else {
|
|
/*
|
|
* trying to get the type and mode via SFU can be slow,
|
|
* so just call those regular files for now, and mark
|
|
* for reval
|
|
*/
|
|
fattr->cf_flags |= CIFS_FATTR_NEED_REVAL;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Fill a cifs_fattr struct with info from SMB_FIND_FILE_POSIX_INFO. */
|
|
static void
|
|
cifs_posix_to_fattr(struct cifs_fattr *fattr, struct smb2_posix_info *info,
|
|
struct cifs_sb_info *cifs_sb)
|
|
{
|
|
struct smb2_posix_info_parsed parsed;
|
|
|
|
posix_info_parse(info, NULL, &parsed);
|
|
|
|
memset(fattr, 0, sizeof(*fattr));
|
|
fattr->cf_uniqueid = le64_to_cpu(info->Inode);
|
|
fattr->cf_bytes = le64_to_cpu(info->AllocationSize);
|
|
fattr->cf_eof = le64_to_cpu(info->EndOfFile);
|
|
|
|
fattr->cf_atime = cifs_NTtimeToUnix(info->LastAccessTime);
|
|
fattr->cf_mtime = cifs_NTtimeToUnix(info->LastWriteTime);
|
|
fattr->cf_ctime = cifs_NTtimeToUnix(info->CreationTime);
|
|
|
|
fattr->cf_nlink = le32_to_cpu(info->HardLinks);
|
|
fattr->cf_cifsattrs = le32_to_cpu(info->DosAttributes);
|
|
|
|
/*
|
|
* Since we set the inode type below we need to mask off
|
|
* to avoid strange results if bits set above.
|
|
* XXX: why not make server&client use the type bits?
|
|
*/
|
|
fattr->cf_mode = le32_to_cpu(info->Mode) & ~S_IFMT;
|
|
|
|
cifs_dbg(FYI, "posix fattr: dev %d, reparse %d, mode %o\n",
|
|
le32_to_cpu(info->DeviceId),
|
|
le32_to_cpu(info->ReparseTag),
|
|
le32_to_cpu(info->Mode));
|
|
|
|
if (fattr->cf_cifsattrs & ATTR_DIRECTORY) {
|
|
fattr->cf_mode |= S_IFDIR;
|
|
fattr->cf_dtype = DT_DIR;
|
|
} else {
|
|
/*
|
|
* mark anything that is not a dir as regular
|
|
* file. special files should have the REPARSE
|
|
* attribute and will be marked as needing revaluation
|
|
*/
|
|
fattr->cf_mode |= S_IFREG;
|
|
fattr->cf_dtype = DT_REG;
|
|
}
|
|
|
|
if (reparse_file_needs_reval(fattr))
|
|
fattr->cf_flags |= CIFS_FATTR_NEED_REVAL;
|
|
|
|
sid_to_id(cifs_sb, &parsed.owner, fattr, SIDOWNER);
|
|
sid_to_id(cifs_sb, &parsed.group, fattr, SIDGROUP);
|
|
}
|
|
|
|
static void __dir_info_to_fattr(struct cifs_fattr *fattr, const void *info)
|
|
{
|
|
const FILE_DIRECTORY_INFO *fi = info;
|
|
|
|
memset(fattr, 0, sizeof(*fattr));
|
|
fattr->cf_cifsattrs = le32_to_cpu(fi->ExtFileAttributes);
|
|
fattr->cf_eof = le64_to_cpu(fi->EndOfFile);
|
|
fattr->cf_bytes = le64_to_cpu(fi->AllocationSize);
|
|
fattr->cf_createtime = le64_to_cpu(fi->CreationTime);
|
|
fattr->cf_atime = cifs_NTtimeToUnix(fi->LastAccessTime);
|
|
fattr->cf_ctime = cifs_NTtimeToUnix(fi->ChangeTime);
|
|
fattr->cf_mtime = cifs_NTtimeToUnix(fi->LastWriteTime);
|
|
}
|
|
|
|
void
|
|
cifs_dir_info_to_fattr(struct cifs_fattr *fattr, FILE_DIRECTORY_INFO *info,
|
|
struct cifs_sb_info *cifs_sb)
|
|
{
|
|
__dir_info_to_fattr(fattr, info);
|
|
cifs_fill_common_info(fattr, cifs_sb);
|
|
}
|
|
|
|
static void cifs_fulldir_info_to_fattr(struct cifs_fattr *fattr,
|
|
SEARCH_ID_FULL_DIR_INFO *info,
|
|
struct cifs_sb_info *cifs_sb)
|
|
{
|
|
__dir_info_to_fattr(fattr, info);
|
|
|
|
/* See MS-FSCC 2.4.19 FileIdFullDirectoryInformation */
|
|
if (fattr->cf_cifsattrs & ATTR_REPARSE)
|
|
fattr->cf_cifstag = le32_to_cpu(info->EaSize);
|
|
cifs_fill_common_info(fattr, cifs_sb);
|
|
}
|
|
|
|
static void
|
|
cifs_std_info_to_fattr(struct cifs_fattr *fattr, FIND_FILE_STANDARD_INFO *info,
|
|
struct cifs_sb_info *cifs_sb)
|
|
{
|
|
int offset = cifs_sb_master_tcon(cifs_sb)->ses->server->timeAdj;
|
|
|
|
memset(fattr, 0, sizeof(*fattr));
|
|
fattr->cf_atime = cnvrtDosUnixTm(info->LastAccessDate,
|
|
info->LastAccessTime, offset);
|
|
fattr->cf_ctime = cnvrtDosUnixTm(info->LastWriteDate,
|
|
info->LastWriteTime, offset);
|
|
fattr->cf_mtime = cnvrtDosUnixTm(info->LastWriteDate,
|
|
info->LastWriteTime, offset);
|
|
|
|
fattr->cf_cifsattrs = le16_to_cpu(info->Attributes);
|
|
fattr->cf_bytes = le32_to_cpu(info->AllocationSize);
|
|
fattr->cf_eof = le32_to_cpu(info->DataSize);
|
|
|
|
cifs_fill_common_info(fattr, cifs_sb);
|
|
}
|
|
|
|
/* BB eventually need to add the following helper function to
|
|
resolve NT_STATUS_STOPPED_ON_SYMLINK return code when
|
|
we try to do FindFirst on (NTFS) directory symlinks */
|
|
/*
|
|
int get_symlink_reparse_path(char *full_path, struct cifs_sb_info *cifs_sb,
|
|
unsigned int xid)
|
|
{
|
|
__u16 fid;
|
|
int len;
|
|
int oplock = 0;
|
|
int rc;
|
|
struct cifs_tcon *ptcon = cifs_sb_tcon(cifs_sb);
|
|
char *tmpbuffer;
|
|
|
|
rc = CIFSSMBOpen(xid, ptcon, full_path, FILE_OPEN, GENERIC_READ,
|
|
OPEN_REPARSE_POINT, &fid, &oplock, NULL,
|
|
cifs_sb->local_nls,
|
|
cifs_remap(cifs_sb);
|
|
if (!rc) {
|
|
tmpbuffer = kmalloc(maxpath);
|
|
rc = CIFSSMBQueryReparseLinkInfo(xid, ptcon, full_path,
|
|
tmpbuffer,
|
|
maxpath -1,
|
|
fid,
|
|
cifs_sb->local_nls);
|
|
if (CIFSSMBClose(xid, ptcon, fid)) {
|
|
cifs_dbg(FYI, "Error closing temporary reparsepoint open\n");
|
|
}
|
|
}
|
|
}
|
|
*/
|
|
|
|
static int
|
|
_initiate_cifs_search(const unsigned int xid, struct file *file,
|
|
const char *full_path)
|
|
{
|
|
__u16 search_flags;
|
|
int rc = 0;
|
|
struct cifsFileInfo *cifsFile;
|
|
struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(file);
|
|
struct tcon_link *tlink = NULL;
|
|
struct cifs_tcon *tcon;
|
|
struct TCP_Server_Info *server;
|
|
|
|
if (file->private_data == NULL) {
|
|
tlink = cifs_sb_tlink(cifs_sb);
|
|
if (IS_ERR(tlink))
|
|
return PTR_ERR(tlink);
|
|
|
|
cifsFile = kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL);
|
|
if (cifsFile == NULL) {
|
|
rc = -ENOMEM;
|
|
goto error_exit;
|
|
}
|
|
spin_lock_init(&cifsFile->file_info_lock);
|
|
file->private_data = cifsFile;
|
|
cifsFile->tlink = cifs_get_tlink(tlink);
|
|
tcon = tlink_tcon(tlink);
|
|
} else {
|
|
cifsFile = file->private_data;
|
|
tcon = tlink_tcon(cifsFile->tlink);
|
|
}
|
|
|
|
server = tcon->ses->server;
|
|
|
|
if (!server->ops->query_dir_first) {
|
|
rc = -ENOSYS;
|
|
goto error_exit;
|
|
}
|
|
|
|
cifsFile->invalidHandle = true;
|
|
cifsFile->srch_inf.endOfSearch = false;
|
|
|
|
cifs_dbg(FYI, "Full path: %s start at: %lld\n", full_path, file->f_pos);
|
|
|
|
ffirst_retry:
|
|
/* test for Unix extensions */
|
|
/* but now check for them on the share/mount not on the SMB session */
|
|
/* if (cap_unix(tcon->ses) { */
|
|
if (tcon->unix_ext)
|
|
cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX;
|
|
else if (tcon->posix_extensions)
|
|
cifsFile->srch_inf.info_level = SMB_FIND_FILE_POSIX_INFO;
|
|
else if ((tcon->ses->capabilities &
|
|
tcon->ses->server->vals->cap_nt_find) == 0) {
|
|
cifsFile->srch_inf.info_level = SMB_FIND_FILE_INFO_STANDARD;
|
|
} else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
|
|
cifsFile->srch_inf.info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO;
|
|
} else /* not srvinos - BB fixme add check for backlevel? */ {
|
|
cifsFile->srch_inf.info_level = SMB_FIND_FILE_DIRECTORY_INFO;
|
|
}
|
|
|
|
search_flags = CIFS_SEARCH_CLOSE_AT_END | CIFS_SEARCH_RETURN_RESUME;
|
|
if (backup_cred(cifs_sb))
|
|
search_flags |= CIFS_SEARCH_BACKUP_SEARCH;
|
|
|
|
rc = server->ops->query_dir_first(xid, tcon, full_path, cifs_sb,
|
|
&cifsFile->fid, search_flags,
|
|
&cifsFile->srch_inf);
|
|
|
|
if (rc == 0)
|
|
cifsFile->invalidHandle = false;
|
|
/* BB add following call to handle readdir on new NTFS symlink errors
|
|
else if STATUS_STOPPED_ON_SYMLINK
|
|
call get_symlink_reparse_path and retry with new path */
|
|
else if ((rc == -EOPNOTSUPP) &&
|
|
(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
|
|
cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
|
|
goto ffirst_retry;
|
|
}
|
|
error_exit:
|
|
cifs_put_tlink(tlink);
|
|
return rc;
|
|
}
|
|
|
|
static int
|
|
initiate_cifs_search(const unsigned int xid, struct file *file,
|
|
const char *full_path)
|
|
{
|
|
int rc, retry_count = 0;
|
|
|
|
do {
|
|
rc = _initiate_cifs_search(xid, file, full_path);
|
|
/*
|
|
* If we don't have enough credits to start reading the
|
|
* directory just try again after short wait.
|
|
*/
|
|
if (rc != -EDEADLK)
|
|
break;
|
|
|
|
usleep_range(512, 2048);
|
|
} while (retry_count++ < 5);
|
|
|
|
return rc;
|
|
}
|
|
|
|
/* return length of unicode string in bytes */
|
|
static int cifs_unicode_bytelen(const char *str)
|
|
{
|
|
int len;
|
|
const __le16 *ustr = (const __le16 *)str;
|
|
|
|
for (len = 0; len <= PATH_MAX; len++) {
|
|
if (ustr[len] == 0)
|
|
return len << 1;
|
|
}
|
|
cifs_dbg(FYI, "Unicode string longer than PATH_MAX found\n");
|
|
return len << 1;
|
|
}
|
|
|
|
static char *nxt_dir_entry(char *old_entry, char *end_of_smb, int level)
|
|
{
|
|
char *new_entry;
|
|
FILE_DIRECTORY_INFO *pDirInfo = (FILE_DIRECTORY_INFO *)old_entry;
|
|
|
|
if (level == SMB_FIND_FILE_INFO_STANDARD) {
|
|
FIND_FILE_STANDARD_INFO *pfData;
|
|
pfData = (FIND_FILE_STANDARD_INFO *)pDirInfo;
|
|
|
|
new_entry = old_entry + sizeof(FIND_FILE_STANDARD_INFO) +
|
|
pfData->FileNameLength;
|
|
} else {
|
|
u32 next_offset = le32_to_cpu(pDirInfo->NextEntryOffset);
|
|
|
|
if (old_entry + next_offset < old_entry) {
|
|
cifs_dbg(VFS, "Invalid offset %u\n", next_offset);
|
|
return NULL;
|
|
}
|
|
new_entry = old_entry + next_offset;
|
|
}
|
|
cifs_dbg(FYI, "new entry %p old entry %p\n", new_entry, old_entry);
|
|
/* validate that new_entry is not past end of SMB */
|
|
if (new_entry >= end_of_smb) {
|
|
cifs_dbg(VFS, "search entry %p began after end of SMB %p old entry %p\n",
|
|
new_entry, end_of_smb, old_entry);
|
|
return NULL;
|
|
} else if (((level == SMB_FIND_FILE_INFO_STANDARD) &&
|
|
(new_entry + sizeof(FIND_FILE_STANDARD_INFO) > end_of_smb))
|
|
|| ((level != SMB_FIND_FILE_INFO_STANDARD) &&
|
|
(new_entry + sizeof(FILE_DIRECTORY_INFO) > end_of_smb))) {
|
|
cifs_dbg(VFS, "search entry %p extends after end of SMB %p\n",
|
|
new_entry, end_of_smb);
|
|
return NULL;
|
|
} else
|
|
return new_entry;
|
|
|
|
}
|
|
|
|
struct cifs_dirent {
|
|
const char *name;
|
|
size_t namelen;
|
|
u32 resume_key;
|
|
u64 ino;
|
|
};
|
|
|
|
static void cifs_fill_dirent_posix(struct cifs_dirent *de,
|
|
const struct smb2_posix_info *info)
|
|
{
|
|
struct smb2_posix_info_parsed parsed;
|
|
|
|
/* payload should have already been checked at this point */
|
|
if (posix_info_parse(info, NULL, &parsed) < 0) {
|
|
cifs_dbg(VFS, "Invalid POSIX info payload\n");
|
|
return;
|
|
}
|
|
|
|
de->name = parsed.name;
|
|
de->namelen = parsed.name_len;
|
|
de->resume_key = info->Ignored;
|
|
de->ino = le64_to_cpu(info->Inode);
|
|
}
|
|
|
|
static void cifs_fill_dirent_unix(struct cifs_dirent *de,
|
|
const FILE_UNIX_INFO *info, bool is_unicode)
|
|
{
|
|
de->name = &info->FileName[0];
|
|
if (is_unicode)
|
|
de->namelen = cifs_unicode_bytelen(de->name);
|
|
else
|
|
de->namelen = strnlen(de->name, PATH_MAX);
|
|
de->resume_key = info->ResumeKey;
|
|
de->ino = le64_to_cpu(info->basic.UniqueId);
|
|
}
|
|
|
|
static void cifs_fill_dirent_dir(struct cifs_dirent *de,
|
|
const FILE_DIRECTORY_INFO *info)
|
|
{
|
|
de->name = &info->FileName[0];
|
|
de->namelen = le32_to_cpu(info->FileNameLength);
|
|
de->resume_key = info->FileIndex;
|
|
}
|
|
|
|
static void cifs_fill_dirent_full(struct cifs_dirent *de,
|
|
const FILE_FULL_DIRECTORY_INFO *info)
|
|
{
|
|
de->name = &info->FileName[0];
|
|
de->namelen = le32_to_cpu(info->FileNameLength);
|
|
de->resume_key = info->FileIndex;
|
|
}
|
|
|
|
static void cifs_fill_dirent_search(struct cifs_dirent *de,
|
|
const SEARCH_ID_FULL_DIR_INFO *info)
|
|
{
|
|
de->name = &info->FileName[0];
|
|
de->namelen = le32_to_cpu(info->FileNameLength);
|
|
de->resume_key = info->FileIndex;
|
|
de->ino = le64_to_cpu(info->UniqueId);
|
|
}
|
|
|
|
static void cifs_fill_dirent_both(struct cifs_dirent *de,
|
|
const FILE_BOTH_DIRECTORY_INFO *info)
|
|
{
|
|
de->name = &info->FileName[0];
|
|
de->namelen = le32_to_cpu(info->FileNameLength);
|
|
de->resume_key = info->FileIndex;
|
|
}
|
|
|
|
static void cifs_fill_dirent_std(struct cifs_dirent *de,
|
|
const FIND_FILE_STANDARD_INFO *info)
|
|
{
|
|
de->name = &info->FileName[0];
|
|
/* one byte length, no endianess conversion */
|
|
de->namelen = info->FileNameLength;
|
|
de->resume_key = info->ResumeKey;
|
|
}
|
|
|
|
static int cifs_fill_dirent(struct cifs_dirent *de, const void *info,
|
|
u16 level, bool is_unicode)
|
|
{
|
|
memset(de, 0, sizeof(*de));
|
|
|
|
switch (level) {
|
|
case SMB_FIND_FILE_POSIX_INFO:
|
|
cifs_fill_dirent_posix(de, info);
|
|
break;
|
|
case SMB_FIND_FILE_UNIX:
|
|
cifs_fill_dirent_unix(de, info, is_unicode);
|
|
break;
|
|
case SMB_FIND_FILE_DIRECTORY_INFO:
|
|
cifs_fill_dirent_dir(de, info);
|
|
break;
|
|
case SMB_FIND_FILE_FULL_DIRECTORY_INFO:
|
|
cifs_fill_dirent_full(de, info);
|
|
break;
|
|
case SMB_FIND_FILE_ID_FULL_DIR_INFO:
|
|
cifs_fill_dirent_search(de, info);
|
|
break;
|
|
case SMB_FIND_FILE_BOTH_DIRECTORY_INFO:
|
|
cifs_fill_dirent_both(de, info);
|
|
break;
|
|
case SMB_FIND_FILE_INFO_STANDARD:
|
|
cifs_fill_dirent_std(de, info);
|
|
break;
|
|
default:
|
|
cifs_dbg(FYI, "Unknown findfirst level %d\n", level);
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
#define UNICODE_DOT cpu_to_le16(0x2e)
|
|
|
|
/* return 0 if no match and 1 for . (current directory) and 2 for .. (parent) */
|
|
static int cifs_entry_is_dot(struct cifs_dirent *de, bool is_unicode)
|
|
{
|
|
int rc = 0;
|
|
|
|
if (!de->name)
|
|
return 0;
|
|
|
|
if (is_unicode) {
|
|
__le16 *ufilename = (__le16 *)de->name;
|
|
if (de->namelen == 2) {
|
|
/* check for . */
|
|
if (ufilename[0] == UNICODE_DOT)
|
|
rc = 1;
|
|
} else if (de->namelen == 4) {
|
|
/* check for .. */
|
|
if (ufilename[0] == UNICODE_DOT &&
|
|
ufilename[1] == UNICODE_DOT)
|
|
rc = 2;
|
|
}
|
|
} else /* ASCII */ {
|
|
if (de->namelen == 1) {
|
|
if (de->name[0] == '.')
|
|
rc = 1;
|
|
} else if (de->namelen == 2) {
|
|
if (de->name[0] == '.' && de->name[1] == '.')
|
|
rc = 2;
|
|
}
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
/* Check if directory that we are searching has changed so we can decide
|
|
whether we can use the cached search results from the previous search */
|
|
static int is_dir_changed(struct file *file)
|
|
{
|
|
struct inode *inode = file_inode(file);
|
|
struct cifsInodeInfo *cifsInfo = CIFS_I(inode);
|
|
|
|
if (cifsInfo->time == 0)
|
|
return 1; /* directory was changed, perhaps due to unlink */
|
|
else
|
|
return 0;
|
|
|
|
}
|
|
|
|
static int cifs_save_resume_key(const char *current_entry,
|
|
struct cifsFileInfo *file_info)
|
|
{
|
|
struct cifs_dirent de;
|
|
int rc;
|
|
|
|
rc = cifs_fill_dirent(&de, current_entry, file_info->srch_inf.info_level,
|
|
file_info->srch_inf.unicode);
|
|
if (!rc) {
|
|
file_info->srch_inf.presume_name = de.name;
|
|
file_info->srch_inf.resume_name_len = de.namelen;
|
|
file_info->srch_inf.resume_key = de.resume_key;
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* Find the corresponding entry in the search. Note that the SMB server returns
|
|
* search entries for . and .. which complicates logic here if we choose to
|
|
* parse for them and we do not assume that they are located in the findfirst
|
|
* return buffer. We start counting in the buffer with entry 2 and increment for
|
|
* every entry (do not increment for . or .. entry).
|
|
*/
|
|
static int
|
|
find_cifs_entry(const unsigned int xid, struct cifs_tcon *tcon, loff_t pos,
|
|
struct file *file, const char *full_path,
|
|
char **current_entry, int *num_to_ret)
|
|
{
|
|
__u16 search_flags;
|
|
int rc = 0;
|
|
int pos_in_buf = 0;
|
|
loff_t first_entry_in_buffer;
|
|
loff_t index_to_find = pos;
|
|
struct cifsFileInfo *cfile = file->private_data;
|
|
struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(file);
|
|
struct TCP_Server_Info *server = tcon->ses->server;
|
|
/* check if index in the buffer */
|
|
|
|
if (!server->ops->query_dir_first || !server->ops->query_dir_next)
|
|
return -ENOSYS;
|
|
|
|
if ((cfile == NULL) || (current_entry == NULL) || (num_to_ret == NULL))
|
|
return -ENOENT;
|
|
|
|
*current_entry = NULL;
|
|
first_entry_in_buffer = cfile->srch_inf.index_of_last_entry -
|
|
cfile->srch_inf.entries_in_buffer;
|
|
|
|
/*
|
|
* If first entry in buf is zero then is first buffer
|
|
* in search response data which means it is likely . and ..
|
|
* will be in this buffer, although some servers do not return
|
|
* . and .. for the root of a drive and for those we need
|
|
* to start two entries earlier.
|
|
*/
|
|
|
|
dump_cifs_file_struct(file, "In fce ");
|
|
if (((index_to_find < cfile->srch_inf.index_of_last_entry) &&
|
|
is_dir_changed(file)) || (index_to_find < first_entry_in_buffer)) {
|
|
/* close and restart search */
|
|
cifs_dbg(FYI, "search backing up - close and restart search\n");
|
|
spin_lock(&cfile->file_info_lock);
|
|
if (server->ops->dir_needs_close(cfile)) {
|
|
cfile->invalidHandle = true;
|
|
spin_unlock(&cfile->file_info_lock);
|
|
if (server->ops->close_dir)
|
|
server->ops->close_dir(xid, tcon, &cfile->fid);
|
|
} else
|
|
spin_unlock(&cfile->file_info_lock);
|
|
if (cfile->srch_inf.ntwrk_buf_start) {
|
|
cifs_dbg(FYI, "freeing SMB ff cache buf on search rewind\n");
|
|
if (cfile->srch_inf.smallBuf)
|
|
cifs_small_buf_release(cfile->srch_inf.
|
|
ntwrk_buf_start);
|
|
else
|
|
cifs_buf_release(cfile->srch_inf.
|
|
ntwrk_buf_start);
|
|
cfile->srch_inf.ntwrk_buf_start = NULL;
|
|
}
|
|
rc = initiate_cifs_search(xid, file, full_path);
|
|
if (rc) {
|
|
cifs_dbg(FYI, "error %d reinitiating a search on rewind\n",
|
|
rc);
|
|
return rc;
|
|
}
|
|
/* FindFirst/Next set last_entry to NULL on malformed reply */
|
|
if (cfile->srch_inf.last_entry)
|
|
cifs_save_resume_key(cfile->srch_inf.last_entry, cfile);
|
|
}
|
|
|
|
search_flags = CIFS_SEARCH_CLOSE_AT_END | CIFS_SEARCH_RETURN_RESUME;
|
|
if (backup_cred(cifs_sb))
|
|
search_flags |= CIFS_SEARCH_BACKUP_SEARCH;
|
|
|
|
while ((index_to_find >= cfile->srch_inf.index_of_last_entry) &&
|
|
(rc == 0) && !cfile->srch_inf.endOfSearch) {
|
|
cifs_dbg(FYI, "calling findnext2\n");
|
|
rc = server->ops->query_dir_next(xid, tcon, &cfile->fid,
|
|
search_flags,
|
|
&cfile->srch_inf);
|
|
/* FindFirst/Next set last_entry to NULL on malformed reply */
|
|
if (cfile->srch_inf.last_entry)
|
|
cifs_save_resume_key(cfile->srch_inf.last_entry, cfile);
|
|
if (rc)
|
|
return -ENOENT;
|
|
}
|
|
if (index_to_find < cfile->srch_inf.index_of_last_entry) {
|
|
/* we found the buffer that contains the entry */
|
|
/* scan and find it */
|
|
int i;
|
|
char *cur_ent;
|
|
char *end_of_smb;
|
|
|
|
if (cfile->srch_inf.ntwrk_buf_start == NULL) {
|
|
cifs_dbg(VFS, "ntwrk_buf_start is NULL during readdir\n");
|
|
return -EIO;
|
|
}
|
|
|
|
end_of_smb = cfile->srch_inf.ntwrk_buf_start +
|
|
server->ops->calc_smb_size(
|
|
cfile->srch_inf.ntwrk_buf_start,
|
|
server);
|
|
|
|
cur_ent = cfile->srch_inf.srch_entries_start;
|
|
first_entry_in_buffer = cfile->srch_inf.index_of_last_entry
|
|
- cfile->srch_inf.entries_in_buffer;
|
|
pos_in_buf = index_to_find - first_entry_in_buffer;
|
|
cifs_dbg(FYI, "found entry - pos_in_buf %d\n", pos_in_buf);
|
|
|
|
for (i = 0; (i < (pos_in_buf)) && (cur_ent != NULL); i++) {
|
|
/* go entry by entry figuring out which is first */
|
|
cur_ent = nxt_dir_entry(cur_ent, end_of_smb,
|
|
cfile->srch_inf.info_level);
|
|
}
|
|
if ((cur_ent == NULL) && (i < pos_in_buf)) {
|
|
/* BB fixme - check if we should flag this error */
|
|
cifs_dbg(VFS, "reached end of buf searching for pos in buf %d index to find %lld rc %d\n",
|
|
pos_in_buf, index_to_find, rc);
|
|
}
|
|
rc = 0;
|
|
*current_entry = cur_ent;
|
|
} else {
|
|
cifs_dbg(FYI, "index not in buffer - could not findnext into it\n");
|
|
return 0;
|
|
}
|
|
|
|
if (pos_in_buf >= cfile->srch_inf.entries_in_buffer) {
|
|
cifs_dbg(FYI, "can not return entries pos_in_buf beyond last\n");
|
|
*num_to_ret = 0;
|
|
} else
|
|
*num_to_ret = cfile->srch_inf.entries_in_buffer - pos_in_buf;
|
|
|
|
return rc;
|
|
}
|
|
|
|
static int cifs_filldir(char *find_entry, struct file *file,
|
|
struct dir_context *ctx,
|
|
char *scratch_buf, unsigned int max_len)
|
|
{
|
|
struct cifsFileInfo *file_info = file->private_data;
|
|
struct super_block *sb = file_inode(file)->i_sb;
|
|
struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
|
|
struct cifs_dirent de = { NULL, };
|
|
struct cifs_fattr fattr;
|
|
struct qstr name;
|
|
int rc = 0;
|
|
ino_t ino;
|
|
|
|
rc = cifs_fill_dirent(&de, find_entry, file_info->srch_inf.info_level,
|
|
file_info->srch_inf.unicode);
|
|
if (rc)
|
|
return rc;
|
|
|
|
if (de.namelen > max_len) {
|
|
cifs_dbg(VFS, "bad search response length %zd past smb end\n",
|
|
de.namelen);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* skip . and .. since we added them first */
|
|
if (cifs_entry_is_dot(&de, file_info->srch_inf.unicode))
|
|
return 0;
|
|
|
|
if (file_info->srch_inf.unicode) {
|
|
struct nls_table *nlt = cifs_sb->local_nls;
|
|
int map_type;
|
|
|
|
map_type = cifs_remap(cifs_sb);
|
|
name.name = scratch_buf;
|
|
name.len =
|
|
cifs_from_utf16((char *)name.name, (__le16 *)de.name,
|
|
UNICODE_NAME_MAX,
|
|
min_t(size_t, de.namelen,
|
|
(size_t)max_len), nlt, map_type);
|
|
name.len -= nls_nullsize(nlt);
|
|
} else {
|
|
name.name = de.name;
|
|
name.len = de.namelen;
|
|
}
|
|
|
|
switch (file_info->srch_inf.info_level) {
|
|
case SMB_FIND_FILE_POSIX_INFO:
|
|
cifs_posix_to_fattr(&fattr,
|
|
(struct smb2_posix_info *)find_entry,
|
|
cifs_sb);
|
|
break;
|
|
case SMB_FIND_FILE_UNIX:
|
|
cifs_unix_basic_to_fattr(&fattr,
|
|
&((FILE_UNIX_INFO *)find_entry)->basic,
|
|
cifs_sb);
|
|
break;
|
|
case SMB_FIND_FILE_INFO_STANDARD:
|
|
cifs_std_info_to_fattr(&fattr,
|
|
(FIND_FILE_STANDARD_INFO *)find_entry,
|
|
cifs_sb);
|
|
break;
|
|
case SMB_FIND_FILE_ID_FULL_DIR_INFO:
|
|
cifs_fulldir_info_to_fattr(&fattr,
|
|
(SEARCH_ID_FULL_DIR_INFO *)find_entry,
|
|
cifs_sb);
|
|
break;
|
|
default:
|
|
cifs_dir_info_to_fattr(&fattr,
|
|
(FILE_DIRECTORY_INFO *)find_entry,
|
|
cifs_sb);
|
|
break;
|
|
}
|
|
|
|
if (de.ino && (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
|
|
fattr.cf_uniqueid = de.ino;
|
|
} else {
|
|
fattr.cf_uniqueid = iunique(sb, ROOT_I);
|
|
cifs_autodisable_serverino(cifs_sb);
|
|
}
|
|
|
|
if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) &&
|
|
couldbe_mf_symlink(&fattr))
|
|
/*
|
|
* trying to get the type and mode can be slow,
|
|
* so just call those regular files for now, and mark
|
|
* for reval
|
|
*/
|
|
fattr.cf_flags |= CIFS_FATTR_NEED_REVAL;
|
|
|
|
cifs_prime_dcache(file_dentry(file), &name, &fattr);
|
|
|
|
ino = cifs_uniqueid_to_ino_t(fattr.cf_uniqueid);
|
|
return !dir_emit(ctx, name.name, name.len, ino, fattr.cf_dtype);
|
|
}
|
|
|
|
|
|
int cifs_readdir(struct file *file, struct dir_context *ctx)
|
|
{
|
|
int rc = 0;
|
|
unsigned int xid;
|
|
int i;
|
|
struct cifs_tcon *tcon;
|
|
struct cifsFileInfo *cifsFile = NULL;
|
|
char *current_entry;
|
|
int num_to_fill = 0;
|
|
char *tmp_buf = NULL;
|
|
char *end_of_smb;
|
|
unsigned int max_len;
|
|
const char *full_path;
|
|
void *page = alloc_dentry_path();
|
|
|
|
xid = get_xid();
|
|
|
|
full_path = build_path_from_dentry(file_dentry(file), page);
|
|
if (IS_ERR(full_path)) {
|
|
rc = PTR_ERR(full_path);
|
|
goto rddir2_exit;
|
|
}
|
|
|
|
/*
|
|
* Ensure FindFirst doesn't fail before doing filldir() for '.' and
|
|
* '..'. Otherwise we won't be able to notify VFS in case of failure.
|
|
*/
|
|
if (file->private_data == NULL) {
|
|
rc = initiate_cifs_search(xid, file, full_path);
|
|
cifs_dbg(FYI, "initiate cifs search rc %d\n", rc);
|
|
if (rc)
|
|
goto rddir2_exit;
|
|
}
|
|
|
|
if (!dir_emit_dots(file, ctx))
|
|
goto rddir2_exit;
|
|
|
|
/* 1) If search is active,
|
|
is in current search buffer?
|
|
if it before then restart search
|
|
if after then keep searching till find it */
|
|
|
|
cifsFile = file->private_data;
|
|
if (cifsFile->srch_inf.endOfSearch) {
|
|
if (cifsFile->srch_inf.emptyDir) {
|
|
cifs_dbg(FYI, "End of search, empty dir\n");
|
|
rc = 0;
|
|
goto rddir2_exit;
|
|
}
|
|
} /* else {
|
|
cifsFile->invalidHandle = true;
|
|
tcon->ses->server->close(xid, tcon, &cifsFile->fid);
|
|
} */
|
|
|
|
tcon = tlink_tcon(cifsFile->tlink);
|
|
rc = find_cifs_entry(xid, tcon, ctx->pos, file, full_path,
|
|
¤t_entry, &num_to_fill);
|
|
if (rc) {
|
|
cifs_dbg(FYI, "fce error %d\n", rc);
|
|
goto rddir2_exit;
|
|
} else if (current_entry != NULL) {
|
|
cifs_dbg(FYI, "entry %lld found\n", ctx->pos);
|
|
} else {
|
|
cifs_dbg(FYI, "Could not find entry\n");
|
|
goto rddir2_exit;
|
|
}
|
|
cifs_dbg(FYI, "loop through %d times filling dir for net buf %p\n",
|
|
num_to_fill, cifsFile->srch_inf.ntwrk_buf_start);
|
|
max_len = tcon->ses->server->ops->calc_smb_size(
|
|
cifsFile->srch_inf.ntwrk_buf_start,
|
|
tcon->ses->server);
|
|
end_of_smb = cifsFile->srch_inf.ntwrk_buf_start + max_len;
|
|
|
|
tmp_buf = kmalloc(UNICODE_NAME_MAX, GFP_KERNEL);
|
|
if (tmp_buf == NULL) {
|
|
rc = -ENOMEM;
|
|
goto rddir2_exit;
|
|
}
|
|
|
|
for (i = 0; i < num_to_fill; i++) {
|
|
if (current_entry == NULL) {
|
|
/* evaluate whether this case is an error */
|
|
cifs_dbg(VFS, "past SMB end, num to fill %d i %d\n",
|
|
num_to_fill, i);
|
|
break;
|
|
}
|
|
/*
|
|
* if buggy server returns . and .. late do we want to
|
|
* check for that here?
|
|
*/
|
|
*tmp_buf = 0;
|
|
rc = cifs_filldir(current_entry, file, ctx,
|
|
tmp_buf, max_len);
|
|
if (rc) {
|
|
if (rc > 0)
|
|
rc = 0;
|
|
break;
|
|
}
|
|
|
|
ctx->pos++;
|
|
if (ctx->pos ==
|
|
cifsFile->srch_inf.index_of_last_entry) {
|
|
cifs_dbg(FYI, "last entry in buf at pos %lld %s\n",
|
|
ctx->pos, tmp_buf);
|
|
cifs_save_resume_key(current_entry, cifsFile);
|
|
break;
|
|
} else
|
|
current_entry =
|
|
nxt_dir_entry(current_entry, end_of_smb,
|
|
cifsFile->srch_inf.info_level);
|
|
}
|
|
kfree(tmp_buf);
|
|
|
|
rddir2_exit:
|
|
free_dentry_path(page);
|
|
free_xid(xid);
|
|
return rc;
|
|
}
|