2 Unix SMB/CIFS implementation.
3 Samba VFS module for handling offline files
4 with Tivoli Storage Manager Space Management
6 (c) Alexander Bokovoy, 2007, 2008
7 (c) Andrew Tridgell, 2007, 2008
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program. If not, see <http://www.gnu.org/licenses/>.
23 This VFS module accepts following options:
24 tsmsm: hsm script = <path to hsm script> (default does nothing)
25 hsm script should point to a shell script which accepts two arguments:
26 <operation> <filepath>
27 where <operation> is currently 'offline' to set offline status of the <filepath>
29 tsmsm: online ratio = ratio to check reported size against actual file size (0.5 by default)
30 tsmsm: dmapi attribute = name of DMAPI attribute that is present when a file is offline.
31 Default is "IBMobj" (which is what GPFS uses)
33 The TSMSM VFS module tries to avoid calling expensive DMAPI calls with some heuristics
34 based on the fact that number of blocks reported of a file multiplied by 512 will be
35 bigger than 'online ratio' of actual size for online (non-migrated) files.
37 If checks fail, we call DMAPI and ask for specific attribute which present for
38 offline (migrated) files. If this attribute presents, we consider file offline.
42 #include "smbd/smbd.h"
45 #error "This module requires DMAPI support!"
48 #ifdef HAVE_XFS_DMAPI_H
49 #include <xfs/dmapi.h>
50 #elif defined(HAVE_SYS_DMI_H)
52 #elif defined(HAVE_SYS_JFSDMAPI_H)
53 #include <sys/jfsdmapi.h>
54 #elif defined(HAVE_SYS_DMAPI_H)
55 #include <sys/dmapi.h>
56 #elif defined(HAVE_DMAPI_H)
60 #ifndef _ISOC99_SOURCE
61 #define _ISOC99_SOURCE
66 /* optimisation tunables - used to avoid the DMAPI slow path */
67 #define FILE_IS_ONLINE_RATIO 0.5
69 /* default attribute name to look for */
70 #define DM_ATTRIB_OBJECT "IBMObj"
75 const char *attrib_name;
76 const char *attrib_value;
79 static void tsmsm_free_data(void **pptr) {
80 struct tsmsm_struct **tsmd = (struct tsmsm_struct **)pptr;
86 called when a client connects to a share
88 static int tsmsm_connect(struct vfs_handle_struct *handle,
91 struct tsmsm_struct *tsmd;
94 int ret = SMB_VFS_NEXT_CONNECT(handle, service, user);
100 tsmd = talloc_zero(handle, struct tsmsm_struct);
102 SMB_VFS_NEXT_DISCONNECT(handle);
103 DEBUG(0,("tsmsm_connect: out of memory!\n"));
107 if (!dmapi_have_session()) {
108 SMB_VFS_NEXT_DISCONNECT(handle);
109 DEBUG(0,("tsmsm_connect: no DMAPI session for Samba is available!\n"));
114 tsmname = (handle->param ? handle->param : "tsmsm");
116 /* Get 'hsm script' and 'dmapi attribute' parameters to tsmd context */
117 tsmd->hsmscript = lp_parm_talloc_string(
118 tsmd, SNUM(handle->conn), tsmname,
120 talloc_steal(tsmd, tsmd->hsmscript);
122 tsmd->attrib_name = lp_parm_talloc_string(
123 tsmd, SNUM(handle->conn), tsmname,
124 "dmapi attribute", DM_ATTRIB_OBJECT);
125 talloc_steal(tsmd, tsmd->attrib_name);
127 tsmd->attrib_value = lp_parm_talloc_string(
128 tsmd, SNUM(handle->conn), tsmname,
129 "dmapi value", NULL);
130 talloc_steal(tsmd, tsmd->attrib_value);
132 /* retrieve 'online ratio'. In case of error default to FILE_IS_ONLINE_RATIO */
133 fres = lp_parm_const_string(SNUM(handle->conn), tsmname,
134 "online ratio", NULL);
136 tsmd->online_ratio = FILE_IS_ONLINE_RATIO;
138 tsmd->online_ratio = strtof(fres, NULL);
139 if (tsmd->online_ratio > 1.0 ||
140 tsmd->online_ratio <= 0.0) {
141 DEBUG(1, ("tsmsm_connect: invalid online ration %f - using %f.\n",
142 tsmd->online_ratio, (float)FILE_IS_ONLINE_RATIO));
146 /* Store the private data. */
147 SMB_VFS_HANDLE_SET_DATA(handle, tsmd, tsmsm_free_data,
148 struct tsmsm_struct, return -1);
152 static bool tsmsm_is_offline(struct vfs_handle_struct *handle,
153 const struct smb_filename *fname,
154 SMB_STRUCT_STAT *stbuf)
156 struct tsmsm_struct *tsmd = (struct tsmsm_struct *) handle->data;
157 const dm_sessid_t *dmsession_id;
158 void *dmhandle = NULL;
159 size_t dmhandle_len = 0;
161 dm_attrname_t dmname;
169 status = get_full_smb_filename(talloc_tos(), fname, &path);
170 if (!NT_STATUS_IS_OK(status)) {
171 errno = map_errno_from_nt_status(status);
175 /* if the file has more than FILE_IS_ONLINE_RATIO of blocks available,
176 then assume it is not offline (it may not be 100%, as it could be sparse) */
177 if (512 * stbuf->st_ex_blocks >=
178 stbuf->st_ex_size * tsmd->online_ratio) {
179 DEBUG(10,("%s not offline: st_blocks=%llu st_size=%llu "
180 "online_ratio=%.2f\n", path,
181 (unsigned long long)stbuf->st_ex_blocks,
182 (unsigned long long)stbuf->st_ex_size, tsmd->online_ratio));
186 dmsession_id = dmapi_get_current_session();
187 if (dmsession_id == NULL) {
188 DEBUG(2, ("tsmsm_is_offline: no DMAPI session available? "
189 "Assume file is online.\n"));
193 /* using POSIX capabilities does not work here. It's a slow path, so
194 * become_root() is just as good anyway (tridge)
197 /* Also, AIX has DMAPI but no POSIX capablities support. In this case,
198 * we need to be root to do DMAPI manipulations.
202 /* go the slow DMAPI route */
203 if (dm_path_to_handle((char*)path, &dmhandle, &dmhandle_len) != 0) {
204 DEBUG(2,("dm_path_to_handle failed - assuming offline (%s) - %s\n",
205 path, strerror(errno)));
210 memset(&dmname, 0, sizeof(dmname));
211 strlcpy((char *)&dmname.an_chars[0], tsmd->attrib_name, sizeof(dmname.an_chars));
213 if (tsmd->attrib_value != NULL) {
214 buflen = strlen(tsmd->attrib_value);
218 buf = talloc_zero_size(tsmd, buflen);
220 DEBUG(0,("out of memory in tsmsm_is_offline -- assuming online (%s)\n", path));
229 ret = dm_get_dmattr(*dmsession_id, dmhandle, dmhandle_len,
230 DM_NO_TOKEN, &dmname, buflen, buf, &rlen);
231 if (ret == -1 && errno == EINVAL) {
232 DEBUG(0, ("Stale DMAPI session, re-creating it.\n"));
234 if (dmapi_new_session()) {
235 dmsession_id = dmapi_get_current_session();
238 ("Unable to re-create DMAPI session, assuming offline (%s) - %s\n",
239 path, strerror(errno)));
241 dm_handle_free(dmhandle, dmhandle_len);
245 } while (ret == -1 && lerrno == EINVAL);
247 /* check if we need a specific attribute value */
248 if (tsmd->attrib_value != NULL) {
249 offline = (ret == 0 && rlen == buflen &&
250 memcmp(buf, tsmd->attrib_value, buflen) == 0);
252 /* its offline if the specified DMAPI attribute exists */
253 offline = (ret == 0 || (ret == -1 && errno == E2BIG));
256 DEBUG(10,("dm_get_dmattr %s ret=%d (%s)\n", path, ret, strerror(errno)));
260 dm_handle_free(dmhandle, dmhandle_len);
269 static bool tsmsm_aio_force(struct vfs_handle_struct *handle, struct files_struct *fsp)
271 SMB_STRUCT_STAT sbuf;
272 struct tsmsm_struct *tsmd = (struct tsmsm_struct *) handle->data;
273 /* see if the file might be offline. This is called before each IO
274 to ensure we use AIO if the file is offline. We don't do the full dmapi
275 call as that would be too slow, instead we err on the side of using AIO
276 if the file might be offline
278 if(SMB_VFS_FSTAT(fsp, &sbuf) == 0) {
279 DEBUG(10,("tsmsm_aio_force st_blocks=%llu st_size=%llu "
280 "online_ratio=%.2f\n", (unsigned long long)sbuf.st_ex_blocks,
281 (unsigned long long)sbuf.st_ex_size, tsmd->online_ratio));
282 return !(512 * sbuf.st_ex_blocks >=
283 sbuf.st_ex_size * tsmd->online_ratio);
288 static ssize_t tsmsm_aio_return(struct vfs_handle_struct *handle, struct files_struct *fsp,
289 SMB_STRUCT_AIOCB *aiocb)
293 result = SMB_VFS_NEXT_AIO_RETURN(handle, fsp, aiocb);
295 notify_fname(handle->conn, NOTIFY_ACTION_MODIFIED,
296 FILE_NOTIFY_CHANGE_ATTRIBUTES,
297 fsp->fsp_name->base_name);
303 static ssize_t tsmsm_sendfile(vfs_handle_struct *handle, int tofd, files_struct *fsp, const DATA_BLOB *hdr,
304 off_t offset, size_t n)
306 bool file_offline = tsmsm_aio_force(handle, fsp);
309 DEBUG(10,("tsmsm_sendfile on offline file - rejecting\n"));
314 return SMB_VFS_NEXT_SENDFILE(handle, tofd, fsp, hdr, offset, n);
317 /* We do overload pread to allow notification when file becomes online after offline status */
318 /* We don't intercept SMB_VFS_READ here because all file I/O now goes through SMB_VFS_PREAD instead */
319 static ssize_t tsmsm_pread(struct vfs_handle_struct *handle, struct files_struct *fsp,
320 void *data, size_t n, off_t offset) {
322 bool notify_online = tsmsm_aio_force(handle, fsp);
324 result = SMB_VFS_NEXT_PREAD(handle, fsp, data, n, offset);
325 if((result != -1) && notify_online) {
326 /* We can't actually force AIO at this point (came here not from reply_read_and_X)
327 what we can do is to send notification that file became online
329 notify_fname(handle->conn, NOTIFY_ACTION_MODIFIED,
330 FILE_NOTIFY_CHANGE_ATTRIBUTES,
331 fsp->fsp_name->base_name);
337 static ssize_t tsmsm_pwrite(struct vfs_handle_struct *handle, struct files_struct *fsp,
338 const void *data, size_t n, off_t offset) {
340 bool notify_online = tsmsm_aio_force(handle, fsp);
342 result = SMB_VFS_NEXT_PWRITE(handle, fsp, data, n, offset);
343 if((result != -1) && notify_online) {
344 /* We can't actually force AIO at this point (came here not from reply_read_and_X)
345 what we can do is to send notification that file became online
347 notify_fname(handle->conn, NOTIFY_ACTION_MODIFIED,
348 FILE_NOTIFY_CHANGE_ATTRIBUTES,
349 fsp->fsp_name->base_name);
355 static int tsmsm_set_offline(struct vfs_handle_struct *handle,
356 const struct smb_filename *fname)
358 struct tsmsm_struct *tsmd = (struct tsmsm_struct *) handle->data;
364 if (tsmd->hsmscript == NULL) {
365 /* no script enabled */
366 DEBUG(1, ("tsmsm_set_offline: No 'tsmsm:hsm script' configured\n"));
370 status = get_full_smb_filename(talloc_tos(), fname, &path);
371 if (!NT_STATUS_IS_OK(status)) {
372 errno = map_errno_from_nt_status(status);
376 /* Now, call the script */
377 command = talloc_asprintf(tsmd, "%s offline \"%s\"", tsmd->hsmscript, path);
379 DEBUG(1, ("tsmsm_set_offline: can't allocate memory to run hsm script"));
382 DEBUG(10, ("tsmsm_set_offline: Running [%s]\n", command));
383 if((result = smbrun(command, NULL)) != 0) {
384 DEBUG(1,("tsmsm_set_offline: Running [%s] returned %d\n", command, result));
386 TALLOC_FREE(command);
390 static uint32_t tsmsm_fs_capabilities(struct vfs_handle_struct *handle,
391 enum timestamp_set_resolution *p_ts_res)
393 return SMB_VFS_NEXT_FS_CAPABILITIES(handle, p_ts_res) | FILE_SUPPORTS_REMOTE_STORAGE | FILE_SUPPORTS_REPARSE_POINTS;
396 static struct vfs_fn_pointers tsmsm_fns = {
397 .connect_fn = tsmsm_connect,
398 .fs_capabilities_fn = tsmsm_fs_capabilities,
399 .aio_force_fn = tsmsm_aio_force,
400 .aio_return_fn = tsmsm_aio_return,
401 .pread_fn = tsmsm_pread,
402 .pwrite_fn = tsmsm_pwrite,
403 .sendfile_fn = tsmsm_sendfile,
404 .is_offline_fn = tsmsm_is_offline,
405 .set_offline_fn = tsmsm_set_offline,
408 NTSTATUS vfs_tsmsm_init(void);
409 NTSTATUS vfs_tsmsm_init(void)
411 return smb_register_vfs(SMB_VFS_INTERFACE_VERSION,
412 "tsmsm", &tsmsm_fns);