cifs: plumb smb2 POSIX dir enumeration
* add code to request POSIX info level * parse dir entries and fill cifs_fattr to get correct inode data since the POSIX payload is variable size the number of entries in a FIND response needs to be computed differently. Dirs and regular files are properly reported along with mode bits, hardlink number, c/m/atime. No special files yet (see below). Current experimental version of Samba with the extension unfortunately has issues with wildcards and needs the following patch: > --- i/source3/smbd/smb2_query_directory.c > +++ w/source3/smbd/smb2_query_directory.c > @@ -397,9 +397,7 @@ smbd_smb2_query_directory_send(TALLOC_CTX > *mem_ctx, > } > } > > - if (!state->smbreq->posix_pathnames) { > wcard_has_wild = ms_has_wild(state->in_file_name); > - } > > /* Ensure we've canonicalized any search path if not a wildcard. */ > if (!wcard_has_wild) { > Also for special files despite reporting them as reparse point samba doesn't set the reparse tag field. This patch will mark them as needing re-evaluation but the re-evaluate code doesn't deal with it yet. Signed-off-by: Aurelien Aptel <aaptel@suse.com> Signed-off-by: Steve French <stfrench@microsoft.com>
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@ -32,6 +32,7 @@
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#include "cifs_debug.h"
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#include "cifs_fs_sb.h"
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#include "cifsfs.h"
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#include "smb2proto.h"
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/*
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* To be safe - for UCS to UTF-8 with strings loaded with the rare long
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@ -217,6 +218,60 @@ cifs_fill_common_info(struct cifs_fattr *fattr, struct cifs_sb_info *cifs_sb)
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}
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}
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/* Fill a cifs_fattr struct with info from SMB_FIND_FILE_POSIX_INFO. */
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static void
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cifs_posix_to_fattr(struct cifs_fattr *fattr, struct smb2_posix_info *info,
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struct cifs_sb_info *cifs_sb)
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{
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struct smb2_posix_info_parsed parsed;
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posix_info_parse(info, NULL, &parsed);
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memset(fattr, 0, sizeof(*fattr));
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fattr->cf_uniqueid = le64_to_cpu(info->Inode);
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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);
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fattr->cf_mtime = cifs_NTtimeToUnix(info->LastWriteTime);
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fattr->cf_ctime = cifs_NTtimeToUnix(info->CreationTime);
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fattr->cf_nlink = le32_to_cpu(info->HardLinks);
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fattr->cf_cifsattrs = le32_to_cpu(info->DosAttributes);
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/*
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* Since we set the inode type below we need to mask off
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* to avoid strange results if bits set above.
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* XXX: why not make server&client use the type bits?
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*/
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fattr->cf_mode = le32_to_cpu(info->Mode) & ~S_IFMT;
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cifs_dbg(VFS, "XXX dev %d, reparse %d, mode %o",
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le32_to_cpu(info->DeviceId),
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le32_to_cpu(info->ReparseTag),
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le32_to_cpu(info->Mode));
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if (fattr->cf_cifsattrs & ATTR_DIRECTORY) {
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fattr->cf_mode |= S_IFDIR;
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fattr->cf_dtype = DT_DIR;
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} else {
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/*
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* mark anything that is not a dir as regular
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* file. special files should have the REPARSE
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* attribute and will be marked as needing revaluation
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*/
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fattr->cf_mode |= S_IFREG;
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fattr->cf_dtype = DT_REG;
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}
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if (reparse_file_needs_reval(fattr))
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fattr->cf_flags |= CIFS_FATTR_NEED_REVAL;
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/* TODO map SIDs */
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fattr->cf_uid = cifs_sb->mnt_uid;
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fattr->cf_gid = cifs_sb->mnt_gid;
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}
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static void __dir_info_to_fattr(struct cifs_fattr *fattr, const void *info)
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{
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const FILE_DIRECTORY_INFO *fi = info;
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@ -359,6 +414,8 @@ ffirst_retry:
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/* if (cap_unix(tcon->ses) { */
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if (tcon->unix_ext)
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cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX;
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else if (tcon->posix_extensions)
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cifsFile->srch_inf.info_level = SMB_FIND_FILE_POSIX_INFO;
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else if ((tcon->ses->capabilities &
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tcon->ses->server->vals->cap_nt_find) == 0) {
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cifsFile->srch_inf.info_level = SMB_FIND_FILE_INFO_STANDARD;
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@ -451,6 +508,23 @@ struct cifs_dirent {
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u64 ino;
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};
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static void cifs_fill_dirent_posix(struct cifs_dirent *de,
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const struct smb2_posix_info *info)
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{
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struct smb2_posix_info_parsed parsed;
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/* payload should have already been checked at this point */
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if (posix_info_parse(info, NULL, &parsed) < 0) {
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cifs_dbg(VFS, "invalid POSIX info payload");
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return;
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}
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de->name = parsed.name;
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de->namelen = parsed.name_len;
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de->resume_key = info->Ignored;
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de->ino = le64_to_cpu(info->Inode);
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}
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static void cifs_fill_dirent_unix(struct cifs_dirent *de,
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const FILE_UNIX_INFO *info, bool is_unicode)
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{
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@ -511,6 +585,9 @@ static int cifs_fill_dirent(struct cifs_dirent *de, const void *info,
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memset(de, 0, sizeof(*de));
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switch (level) {
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case SMB_FIND_FILE_POSIX_INFO:
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cifs_fill_dirent_posix(de, info);
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break;
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case SMB_FIND_FILE_UNIX:
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cifs_fill_dirent_unix(de, info, is_unicode);
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break;
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@ -786,6 +863,11 @@ static int cifs_filldir(char *find_entry, struct file *file,
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}
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switch (file_info->srch_inf.info_level) {
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case SMB_FIND_FILE_POSIX_INFO:
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cifs_posix_to_fattr(&fattr,
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(struct smb2_posix_info *)find_entry,
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cifs_sb);
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break;
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case SMB_FIND_FILE_UNIX:
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cifs_unix_basic_to_fattr(&fattr,
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&((FILE_UNIX_INFO *)find_entry)->basic,
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@ -4398,7 +4398,8 @@ static int posix_info_extra_size(const void *beg, const void *end)
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}
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static unsigned int
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num_entries(char *bufstart, char *end_of_buf, char **lastentry, size_t size)
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num_entries(int infotype, char *bufstart, char *end_of_buf, char **lastentry,
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size_t size)
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{
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int len;
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unsigned int entrycount = 0;
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@ -4422,8 +4423,13 @@ num_entries(char *bufstart, char *end_of_buf, char **lastentry, size_t size)
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entryptr = entryptr + next_offset;
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dir_info = (FILE_DIRECTORY_INFO *)entryptr;
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if (infotype == SMB_FIND_FILE_POSIX_INFO)
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len = posix_info_extra_size(entryptr, end_of_buf);
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else
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len = le32_to_cpu(dir_info->FileNameLength);
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if (entryptr + len < entryptr ||
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if (len < 0 ||
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entryptr + len < entryptr ||
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entryptr + len > end_of_buf ||
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entryptr + len + size > end_of_buf) {
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cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
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@ -4473,6 +4479,9 @@ int SMB2_query_directory_init(const unsigned int xid,
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case SMB_FIND_FILE_ID_FULL_DIR_INFO:
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req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
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break;
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case SMB_FIND_FILE_POSIX_INFO:
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req->FileInformationClass = SMB_FIND_FILE_POSIX_INFO;
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break;
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default:
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cifs_tcon_dbg(VFS, "info level %u isn't supported\n",
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info_level);
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@ -4538,6 +4547,10 @@ smb2_parse_query_directory(struct cifs_tcon *tcon,
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case SMB_FIND_FILE_ID_FULL_DIR_INFO:
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info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
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break;
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case SMB_FIND_FILE_POSIX_INFO:
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/* note that posix payload are variable size */
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info_buf_size = sizeof(struct smb2_posix_info);
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break;
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default:
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cifs_tcon_dbg(VFS, "info level %u isn't supported\n",
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srch_inf->info_level);
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@ -4547,8 +4560,10 @@ smb2_parse_query_directory(struct cifs_tcon *tcon,
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rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
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le32_to_cpu(rsp->OutputBufferLength), rsp_iov,
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info_buf_size);
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if (rc)
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if (rc) {
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cifs_tcon_dbg(VFS, "bad info payload");
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return rc;
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}
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srch_inf->unicode = true;
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@ -4562,9 +4577,14 @@ smb2_parse_query_directory(struct cifs_tcon *tcon,
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srch_inf->srch_entries_start = srch_inf->last_entry =
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(char *)rsp + le16_to_cpu(rsp->OutputBufferOffset);
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end_of_smb = rsp_iov->iov_len + (char *)rsp;
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srch_inf->entries_in_buffer =
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num_entries(srch_inf->srch_entries_start, end_of_smb,
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&srch_inf->last_entry, info_buf_size);
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srch_inf->entries_in_buffer = num_entries(
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srch_inf->info_level,
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srch_inf->srch_entries_start,
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end_of_smb,
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&srch_inf->last_entry,
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info_buf_size);
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srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
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cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
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srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
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