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1036 lines
29 KiB
1036 lines
29 KiB
// SPDX-License-Identifier: LGPL-2.1 |
|
/* |
|
* fs/cifs/readdir.c |
|
* |
|
* Directory search handling |
|
* |
|
* Copyright (C) International Business Machines Corp., 2004, 2008 |
|
* Copyright (C) Red Hat, Inc., 2011 |
|
* Author(s): Steve French ([email protected]) |
|
* |
|
*/ |
|
#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 |
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static inline void dump_cifs_file_struct(struct file *file, char *label) |
|
{ |
|
} |
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#endif /* DEBUG2 */ |
|
|
|
/* |
|
* Attempt to preload the dcache with the results from the FIND_FIRST/NEXT |
|
* |
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* 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. |
|
*/ |
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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); |
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if (inode) { |
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if (d_mountpoint(dentry)) { |
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dput(dentry); |
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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. |
|
*/ |
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if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) |
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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, |
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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); |
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fattr->cf_eof = le64_to_cpu(info->EndOfFile); |
|
|
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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; |
|
} |
|
|
|
/* 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; |
|
}
|
|
|