/* 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 int xid, struct cifsTconInfo *pTcon,
	struct file *file, char **ppCurrentEntry, int *num_to_ret)
{
	int rc = 0;
	int pos_in_buf = 0;
	loff_t first_entry_in_buffer;
	loff_t index_to_find = file->f_pos;
	struct cifsFileInfo *cifsFile = file->private_data;
	/* check if index in the buffer */

	if ((cifsFile == NULL) || (ppCurrentEntry == NULL) ||
	   (num_to_ret == NULL))
		return -ENOENT;

	*ppCurrentEntry = NULL;
	first_entry_in_buffer =
		cifsFile->srch_inf.index_of_last_entry -
			cifsFile->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 < cifsFile->srch_inf.index_of_last_entry) &&
	     is_dir_changed(file)) ||
	   (index_to_find < first_entry_in_buffer)) {
		/* close and restart search */
		cFYI(1, ("search backing up - close and restart search"));
		write_lock(&GlobalSMBSeslock);
		if (!cifsFile->srch_inf.endOfSearch &&
		    !cifsFile->invalidHandle) {
			cifsFile->invalidHandle = true;
			write_unlock(&GlobalSMBSeslock);
			CIFSFindClose(xid, pTcon, cifsFile->netfid);
		} else
			write_unlock(&GlobalSMBSeslock);
		if (cifsFile->srch_inf.ntwrk_buf_start) {
			cFYI(1, ("freeing SMB ff cache buf on search rewind"));
			if (cifsFile->srch_inf.smallBuf)
				cifs_small_buf_release(cifsFile->srch_inf.
						ntwrk_buf_start);
			else
				cifs_buf_release(cifsFile->srch_inf.
						ntwrk_buf_start);
			cifsFile->srch_inf.ntwrk_buf_start = NULL;
		}
		rc = initiate_cifs_search(xid, file);
		if (rc) {
			cFYI(1, ("error %d reinitiating a search on rewind",
				 rc));
			return rc;
		}
		cifs_save_resume_key(cifsFile->srch_inf.last_entry, cifsFile);
	}

	while ((index_to_find >= cifsFile->srch_inf.index_of_last_entry) &&
	      (rc == 0) && !cifsFile->srch_inf.endOfSearch) {
		cFYI(1, ("calling findnext2"));
		rc = CIFSFindNext(xid, pTcon, cifsFile->netfid,
				  &cifsFile->srch_inf);
		cifs_save_resume_key(cifsFile->srch_inf.last_entry, cifsFile);
		if (rc)
			return -ENOENT;
	}
	if (index_to_find < cifsFile->srch_inf.index_of_last_entry) {
		/* we found the buffer that contains the entry */
		/* scan and find it */
		int i;
		char *current_entry;
		char *end_of_smb = cifsFile->srch_inf.ntwrk_buf_start +
			smbCalcSize((struct smb_hdr *)
				cifsFile->srch_inf.ntwrk_buf_start);

		current_entry = cifsFile->srch_inf.srch_entries_start;
		first_entry_in_buffer = cifsFile->srch_inf.index_of_last_entry
					- cifsFile->srch_inf.entries_in_buffer;
		pos_in_buf = index_to_find - first_entry_in_buffer;
		cFYI(1, ("found entry - pos_in_buf %d", pos_in_buf));

		for (i = 0; (i < (pos_in_buf)) && (current_entry != NULL); i++) {
			/* go entry by entry figuring out which is first */
			current_entry = nxt_dir_entry(current_entry, end_of_smb,
						cifsFile->srch_inf.info_level);
		}
		if ((current_entry == NULL) && (i < pos_in_buf)) {
			/* BB fixme - check if we should flag this error */
			cERROR(1, ("reached end of buf searching for pos in buf"
			  " %d index to find %lld rc %d",
			  pos_in_buf, index_to_find, rc));
		}
		rc = 0;
		*ppCurrentEntry = current_entry;
	} else {
		cFYI(1, ("index not in buffer - could not findnext into it"));
		return 0;
	}

	if (pos_in_buf >= cifsFile->srch_inf.entries_in_buffer) {
		cFYI(1, ("can not return entries pos_in_buf beyond last"));
		*num_to_ret = 0;
	} else
		*num_to_ret = cifsFile->srch_inf.entries_in_buffer - pos_in_buf;

	return rc;
}
int cifs_readdir(struct file *file, void *direntry, filldir_t filldir)
{
	int rc = 0;
	int xid, i;
	struct cifs_sb_info *cifs_sb;
	struct cifsTconInfo *pTcon;
	struct cifsFileInfo *cifsFile = NULL;
	char *current_entry;
	int num_to_fill = 0;
	char *tmp_buf = NULL;
	char *end_of_smb;
	int max_len;

	xid = GetXid();

	cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
	pTcon = cifs_sb->tcon;
	if (pTcon == NULL)
		return -EINVAL;

	switch ((int) file->f_pos) {
	case 0:
		if (filldir(direntry, ".", 1, file->f_pos,
		     file->f_path.dentry->d_inode->i_ino, DT_DIR) < 0) {
			cERROR(1, ("Filldir for current dir failed"));
			rc = -ENOMEM;
			break;
		}
		file->f_pos++;
	case 1:
		if (filldir(direntry, "..", 2, file->f_pos,
		     file->f_path.dentry->d_parent->d_inode->i_ino, DT_DIR) < 0) {
			cERROR(1, ("Filldir for parent dir failed"));
			rc = -ENOMEM;
			break;
		}
		file->f_pos++;
	default:
		/* 1) If search is active,
			is in current search buffer?
			if it before then restart search
			if after then keep searching till find it */

		if (file->private_data == NULL) {
			rc = initiate_cifs_search(xid, file);
			cFYI(1, ("initiate cifs search rc %d", rc));
			if (rc) {
				FreeXid(xid);
				return rc;
			}
		}
		if (file->private_data == NULL) {
			rc = -EINVAL;
			FreeXid(xid);
			return rc;
		}
		cifsFile = file->private_data;
		if (cifsFile->srch_inf.endOfSearch) {
			if (cifsFile->srch_inf.emptyDir) {
				cFYI(1, ("End of search, empty dir"));
				rc = 0;
				break;
			}
		} /* else {
			cifsFile->invalidHandle = true;
			CIFSFindClose(xid, pTcon, cifsFile->netfid);
		} */

		rc = find_cifs_entry(xid, pTcon, file,
				&current_entry, &num_to_fill);
		if (rc) {
			cFYI(1, ("fce error %d", rc));
			goto rddir2_exit;
		} else if (current_entry != NULL) {
			cFYI(1, ("entry %lld found", file->f_pos));
		} else {
			cFYI(1, ("could not find entry"));
			goto rddir2_exit;
		}
		cFYI(1, ("loop through %d times filling dir for net buf %p",
			num_to_fill, cifsFile->srch_inf.ntwrk_buf_start));
		max_len = smbCalcSize((struct smb_hdr *)
				cifsFile->srch_inf.ntwrk_buf_start);
		end_of_smb = cifsFile->srch_inf.ntwrk_buf_start + max_len;

		/* 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. cifs_unicode.c,
		which actually does the conversion, has the same limit */
		tmp_buf = kmalloc((2 * NAME_MAX) + 4, GFP_KERNEL);
		for (i = 0; (i < num_to_fill) && (rc == 0); i++) {
			if (current_entry == NULL) {
				/* evaluate whether this case is an error */
				cERROR(1, ("past SMB end,  num to fill %d i %d",
					  num_to_fill, i));
				break;
			}
			/* if buggy server returns . and .. late do
			we want to check for that here? */
			rc = cifs_filldir(current_entry, file,
					filldir, direntry, tmp_buf, max_len);
			if (rc == -EOVERFLOW) {
				rc = 0;
				break;
			}

			file->f_pos++;
			if (file->f_pos ==
				cifsFile->srch_inf.index_of_last_entry) {
				cFYI(1, ("last entry in buf at pos %lld %s",
					file->f_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);
		break;
	} /* end switch */

rddir2_exit:
	FreeXid(xid);
	return rc;
}
Example #3
0
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;

	xid = get_xid();

	/*
	 * 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);
		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, &current_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);
	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_xid(xid);
	return rc;
}
Example #4
0
/*
 * 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, 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(&cifs_file_list_lock);
		if (server->ops->dir_needs_close(cfile)) {
			cfile->invalidHandle = true;
			spin_unlock(&cifs_file_list_lock);
			if (server->ops->close_dir)
				server->ops->close_dir(xid, tcon, &cfile->fid);
		} else
			spin_unlock(&cifs_file_list_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);
		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 = cfile->srch_inf.ntwrk_buf_start +
			server->ops->calc_smb_size(
					cfile->srch_inf.ntwrk_buf_start);

		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;
}
Example #5
0
int cifs_readdir(struct file *file, void *direntry, filldir_t filldir)
{
	int rc = 0;
	int xid, i;
	struct cifs_tcon *pTcon;
	struct cifsFileInfo *cifsFile = NULL;
	char *current_entry;
	int num_to_fill = 0;
	char *tmp_buf = NULL;
	char *end_of_smb;
	unsigned int max_len;

	xid = GetXid();

	/*
	 * 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);
		cFYI(1, "initiate cifs search rc %d", rc);
		if (rc)
			goto rddir2_exit;
	}

	switch ((int) file->f_pos) {
	case 0:
		if (filldir(direntry, ".", 1, file->f_pos,
		     file->f_path.dentry->d_inode->i_ino, DT_DIR) < 0) {
			cERROR(1, "Filldir for current dir failed");
			rc = -ENOMEM;
			break;
		}
		file->f_pos++;
	case 1:
		if (filldir(direntry, "..", 2, file->f_pos,
		     parent_ino(file->f_path.dentry), DT_DIR) < 0) {
			cERROR(1, "Filldir for parent dir failed");
			rc = -ENOMEM;
			break;
		}
		file->f_pos++;
	default:
		/* 1) If search is active,
			is in current search buffer?
			if it before then restart search
			if after then keep searching till find it */

		if (file->private_data == NULL) {
			rc = -EINVAL;
			FreeXid(xid);
			return rc;
		}
		cifsFile = file->private_data;
		if (cifsFile->srch_inf.endOfSearch) {
			if (cifsFile->srch_inf.emptyDir) {
				cFYI(1, "End of search, empty dir");
				rc = 0;
				break;
			}
		} /* else {
			cifsFile->invalidHandle = true;
			CIFSFindClose(xid, pTcon, cifsFile->netfid);
		} */

		pTcon = tlink_tcon(cifsFile->tlink);
		rc = find_cifs_entry(xid, pTcon, file,
				&current_entry, &num_to_fill);
		if (rc) {
			cFYI(1, "fce error %d", rc);
			goto rddir2_exit;
		} else if (current_entry != NULL) {
			cFYI(1, "entry %lld found", file->f_pos);
		} else {
			cFYI(1, "could not find entry");
			goto rddir2_exit;
		}
		cFYI(1, "loop through %d times filling dir for net buf %p",
			num_to_fill, cifsFile->srch_inf.ntwrk_buf_start);
		max_len = smbCalcSize((struct smb_hdr *)
				cifsFile->srch_inf.ntwrk_buf_start);
		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;
			break;
		}

		for (i = 0; (i < num_to_fill) && (rc == 0); i++) {
			if (current_entry == NULL) {
				/* evaluate whether this case is an error */
				cERROR(1, "past SMB end,  num to fill %d i %d",
					  num_to_fill, i);
				break;
			}
			/* if buggy server returns . and .. late do
			we want to check for that here? */
			rc = cifs_filldir(current_entry, file,
					filldir, direntry, tmp_buf, max_len);
			if (rc == -EOVERFLOW) {
				rc = 0;
				break;
			}

			file->f_pos++;
			if (file->f_pos ==
				cifsFile->srch_inf.index_of_last_entry) {
				cFYI(1, "last entry in buf at pos %lld %s",
					file->f_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);
		break;
	} /* end switch */

rddir2_exit:
	FreeXid(xid);
	return rc;
}
Example #6
0
int cifs_readdir(struct file *file, void *direntry, filldir_t filldir)
{
	int rc = 0;
	int xid, i;
	struct cifs_tcon *pTcon;
	struct cifsFileInfo *cifsFile = NULL;
	char *current_entry;
	int num_to_fill = 0;
	char *tmp_buf = NULL;
	char *end_of_smb;
	unsigned int max_len;

	xid = GetXid();

	if (file->private_data == NULL) {
		rc = initiate_cifs_search(xid, file);
		cFYI(1, "initiate cifs search rc %d", rc);
		if (rc)
			goto rddir2_exit;
	}

	switch ((int) file->f_pos) {
	case 0:
		if (filldir(direntry, ".", 1, file->f_pos,
		     file->f_path.dentry->d_inode->i_ino, DT_DIR) < 0) {
			cERROR(1, "Filldir for current dir failed");
			rc = -ENOMEM;
			break;
		}
		file->f_pos++;
	case 1:
		if (filldir(direntry, "..", 2, file->f_pos,
		     parent_ino(file->f_path.dentry), DT_DIR) < 0) {
			cERROR(1, "Filldir for parent dir failed");
			rc = -ENOMEM;
			break;
		}
		file->f_pos++;
	default:

		if (file->private_data == NULL) {
			rc = -EINVAL;
			FreeXid(xid);
			return rc;
		}
		cifsFile = file->private_data;
		if (cifsFile->srch_inf.endOfSearch) {
			if (cifsFile->srch_inf.emptyDir) {
				cFYI(1, "End of search, empty dir");
				rc = 0;
				break;
			}
		} 

		pTcon = tlink_tcon(cifsFile->tlink);
		rc = find_cifs_entry(xid, pTcon, file,
				&current_entry, &num_to_fill);
		if (rc) {
			cFYI(1, "fce error %d", rc);
			goto rddir2_exit;
		} else if (current_entry != NULL) {
			cFYI(1, "entry %lld found", file->f_pos);
		} else {
			cFYI(1, "could not find entry");
			goto rddir2_exit;
		}
		cFYI(1, "loop through %d times filling dir for net buf %p",
			num_to_fill, cifsFile->srch_inf.ntwrk_buf_start);
		max_len = smbCalcSize((struct smb_hdr *)
				cifsFile->srch_inf.ntwrk_buf_start);
		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;
			break;
		}

		for (i = 0; (i < num_to_fill) && (rc == 0); i++) {
			if (current_entry == NULL) {
				
				cERROR(1, "past SMB end,  num to fill %d i %d",
					  num_to_fill, i);
				break;
			}
			rc = cifs_filldir(current_entry, file,
					filldir, direntry, tmp_buf, max_len);
			if (rc == -EOVERFLOW) {
				rc = 0;
				break;
			}

			file->f_pos++;
			if (file->f_pos ==
				cifsFile->srch_inf.index_of_last_entry) {
				cFYI(1, "last entry in buf at pos %lld %s",
					file->f_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);
		break;
	} 

rddir2_exit:
	FreeXid(xid);
	return rc;
}
Example #7
0
static int find_cifs_entry(const int xid, struct cifs_tcon *pTcon,
	struct file *file, char **ppCurrentEntry, int *num_to_ret)
{
	int rc = 0;
	int pos_in_buf = 0;
	loff_t first_entry_in_buffer;
	loff_t index_to_find = file->f_pos;
	struct cifsFileInfo *cifsFile = file->private_data;
	

	if ((cifsFile == NULL) || (ppCurrentEntry == NULL) ||
	   (num_to_ret == NULL))
		return -ENOENT;

	*ppCurrentEntry = NULL;
	first_entry_in_buffer =
		cifsFile->srch_inf.index_of_last_entry -
			cifsFile->srch_inf.entries_in_buffer;


	dump_cifs_file_struct(file, "In fce ");
	if (((index_to_find < cifsFile->srch_inf.index_of_last_entry) &&
	     is_dir_changed(file)) ||
	   (index_to_find < first_entry_in_buffer)) {
		
		cFYI(1, "search backing up - close and restart search");
		spin_lock(&cifs_file_list_lock);
		if (!cifsFile->srch_inf.endOfSearch &&
		    !cifsFile->invalidHandle) {
			cifsFile->invalidHandle = true;
			spin_unlock(&cifs_file_list_lock);
			CIFSFindClose(xid, pTcon, cifsFile->netfid);
		} else
			spin_unlock(&cifs_file_list_lock);
		if (cifsFile->srch_inf.ntwrk_buf_start) {
			cFYI(1, "freeing SMB ff cache buf on search rewind");
			if (cifsFile->srch_inf.smallBuf)
				cifs_small_buf_release(cifsFile->srch_inf.
						ntwrk_buf_start);
			else
				cifs_buf_release(cifsFile->srch_inf.
						ntwrk_buf_start);
			cifsFile->srch_inf.ntwrk_buf_start = NULL;
		}
		rc = initiate_cifs_search(xid, file);
		if (rc) {
			cFYI(1, "error %d reinitiating a search on rewind",
				 rc);
			return rc;
		}
		
		if (cifsFile->srch_inf.last_entry)
			cifs_save_resume_key(cifsFile->srch_inf.last_entry,
						cifsFile);
	}

	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 >= cifsFile->srch_inf.index_of_last_entry) &&
	      (rc == 0) && !cifsFile->srch_inf.endOfSearch) {
		cFYI(1, "calling findnext2");
		rc = CIFSFindNext(xid, pTcon, cifsFile->netfid, search_flags,
				  &cifsFile->srch_inf);
		
		if (cifsFile->srch_inf.last_entry)
			cifs_save_resume_key(cifsFile->srch_inf.last_entry,
						cifsFile);
		if (rc)
			return -ENOENT;
	}
	if (index_to_find < cifsFile->srch_inf.index_of_last_entry) {
		
		
		int i;
		char *current_entry;
		char *end_of_smb = cifsFile->srch_inf.ntwrk_buf_start +
			smbCalcSize((struct smb_hdr *)
				cifsFile->srch_inf.ntwrk_buf_start);

		current_entry = cifsFile->srch_inf.srch_entries_start;
		first_entry_in_buffer = cifsFile->srch_inf.index_of_last_entry
					- cifsFile->srch_inf.entries_in_buffer;
		pos_in_buf = index_to_find - first_entry_in_buffer;
		cFYI(1, "found entry - pos_in_buf %d", pos_in_buf);

		for (i = 0; (i < (pos_in_buf)) && (current_entry != NULL); i++) {
			
			current_entry = nxt_dir_entry(current_entry, end_of_smb,
						cifsFile->srch_inf.info_level);
		}
		if ((current_entry == NULL) && (i < pos_in_buf)) {
			
			cERROR(1, "reached end of buf searching for pos in buf"
			  " %d index to find %lld rc %d",
			  pos_in_buf, index_to_find, rc);
		}
		rc = 0;
		*ppCurrentEntry = current_entry;
	} else {
		cFYI(1, "index not in buffer - could not findnext into it");
		return 0;
	}

	if (pos_in_buf >= cifsFile->srch_inf.entries_in_buffer) {
		cFYI(1, "can not return entries pos_in_buf beyond last");
		*num_to_ret = 0;
	} else
		*num_to_ret = cifsFile->srch_inf.entries_in_buffer - pos_in_buf;

	return rc;
}