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
7 (c) Andrew Tridgell, 2007
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> (/bin/true by default, i.e. 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)
31 The TSMSM VFS module tries to avoid calling expensive DMAPI calls with some heuristics
32 based on the fact that number of blocks reported of a file multiplied by 512 will be
33 bigger than 'online ratio' of actual size for online (non-migrated) files.
35 If checks fail, we call DMAPI and ask for specific IBM attribute which present for
36 offline (migrated) files. If this attribute presents, we consider file offline.
42 #error "This module requires DMAPI support!"
45 #ifdef HAVE_XFS_DMAPI_H
46 #include <xfs/dmapi.h>
47 #elif defined(HAVE_SYS_DMI_H)
49 #elif defined(HAVE_SYS_JFSDMAPI_H)
50 #include <sys/jfsdmapi.h>
51 #elif defined(HAVE_SYS_DMAPI_H)
52 #include <sys/dmapi.h>
53 #elif defined(HAVE_DMAPI_H)
57 #ifndef _ISOC99_SOURCE
58 #define _ISOC99_SOURCE
63 /* optimisation tunables - used to avoid the DMAPI slow path */
64 #define FILE_IS_ONLINE_RATIO 0.5
65 #define DM_ATTRIB_OBJECT "IBMObj"
66 #define DM_ATTRIB_MIGRATED "IBMMig"
74 #define TSM_STRINGIFY(a) #a
75 #define TSM_TOSTRING(a) TSM_STRINGIFY(a)
77 static void tsmsm_free_data(void **pptr) {
78 struct tsmsm_struct **tsmd = (struct tsmsm_struct **)pptr;
83 static int tsmsm_connect(struct vfs_handle_struct *handle,
86 struct tsmsm_struct *tsmd = TALLOC_ZERO_P(handle, struct tsmsm_struct);
87 const char *hsmscript, *tsmname;
91 DEBUG(0,("tsmsm_connect: out of memory!\n"));
95 tsmd->sid = *(dm_sessid_t*) dmapi_get_current_session();
97 if (tsmd->sid == DM_NO_SESSION) {
98 DEBUG(0,("tsmsm_connect: no DMAPI session for Samba is available!\n"));
103 tsmname = (handle->param ? handle->param : "tsmsm");
104 hsmscript = lp_parm_const_string(SNUM(handle->conn), tsmname,
107 tsmd->hsmscript = talloc_strdup(tsmd, hsmscript);
108 if(!tsmd->hsmscript) {
109 DEBUG(1, ("tsmsm_connect: can't allocate memory for hsm script path"));
114 DEBUG(1, ("tsmsm_connect: can't call hsm script because it "
115 "is not set to anything in the smb.conf\n"
116 "Use %s: 'hsm script = path' to set it\n",
122 fres = lp_parm_const_string(SNUM(handle->conn), tsmname,
123 "online ratio", TSM_TOSTRING(FILE_IS_ONLINE_RATIO));
124 tsmd->online_ratio = strtof(fres, NULL);
125 if((tsmd->online_ratio == (float)0) || ((errno == ERANGE) &&
126 ((tsmd->online_ratio == HUGE_VALF) ||
127 (tsmd->online_ratio == HUGE_VALL)))) {
128 DEBUG(1, ("tsmsm_connect: error while getting online ratio from smb.conf."
129 "Default to %s.\n", TSM_TOSTRING(FILE_IS_ONLINE_RATIO)));
130 tsmd->online_ratio = FILE_IS_ONLINE_RATIO;
133 /* Store the private data. */
134 SMB_VFS_HANDLE_SET_DATA(handle, tsmd, tsmsm_free_data,
135 struct tsmsm_struct, return -1);
136 return SMB_VFS_NEXT_CONNECT(handle, service, user);
139 static int tsmsm_is_offline(struct vfs_handle_struct *handle,
141 SMB_STRUCT_STAT *stbuf,
143 struct tsmsm_struct *tsmd = (struct tsmsm_struct *) handle->data;
144 void *dmhandle = NULL;
145 size_t dmhandle_len = 0;
147 dm_attrname_t dmname;
150 /* if the file has more than FILE_IS_ONLINE_RATIO of blocks available,
151 then assume it is not offline (it may not be 100%, as it could be sparse) */
152 if (512 * (off_t)stbuf->st_blocks >= stbuf->st_size * tsmd->online_ratio) {
154 DEBUG(10,("%s not offline: st_blocks=%ld st_size=%ld online_ratio=%.2f\n",
155 path, stbuf->st_blocks, stbuf->st_size, tsmd->online_ratio));
159 /* using POSIX capabilities does not work here. It's a slow path, so
160 * become_root() is just as good anyway (tridge)
163 /* Also, AIX has DMAPI but no POSIX capablities support. In this case,
164 * we need to be root to do DMAPI manipulations.
168 /* go the slow DMAPI route */
169 if (dm_path_to_handle((char*)path, &dmhandle, &dmhandle_len) != 0) {
171 DEBUG(2,("dm_path_to_handle failed - assuming offline (%s) - %s\n",
172 path, strerror(errno)));
177 memset(&dmname, 0, sizeof(dmname));
178 strlcpy((char *)&dmname.an_chars[0], DM_ATTRIB_OBJECT, sizeof(dmname.an_chars));
180 ret = dm_get_dmattr(tsmd->sid, dmhandle, dmhandle_len,
181 DM_NO_TOKEN, &dmname, 0, NULL, &rlen);
183 /* its offline if the IBMObj attribute exists */
184 *offline = (ret == 0 || (ret == -1 && errno == E2BIG));
186 DEBUG(10,("dm_get_dmattr %s ret=%d (%s)\n", path, ret, strerror(errno)));
190 dm_handle_free(dmhandle, dmhandle_len);
198 static bool tsmsm_aio_force(struct vfs_handle_struct *handle, struct files_struct *fsp)
200 SMB_STRUCT_STAT sbuf;
201 struct tsmsm_struct *tsmd = (struct tsmsm_struct *) handle->data;
202 /* see if the file might be offline. This is called before each IO
203 to ensure we use AIO if the file is offline. We don't do the full dmapi
204 call as that would be too slow, instead we err on the side of using AIO
205 if the file might be offline
207 if(SMB_VFS_FSTAT(fsp, &sbuf) == 0) {
208 DEBUG(10,("tsmsm_aio_force st_blocks=%ld st_size=%ld online_ratio=%.2f\n",
209 sbuf.st_blocks, sbuf.st_size, tsmd->online_ratio));
210 return !(512 * (off_t)sbuf.st_blocks >= sbuf.st_size * tsmd->online_ratio);
215 static ssize_t tsmsm_aio_return(struct vfs_handle_struct *handle, struct files_struct *fsp,
216 SMB_STRUCT_AIOCB *aiocb)
220 result = SMB_VFS_NEXT_AIO_RETURN(handle, fsp, aiocb);
222 notify_fname(handle->conn, NOTIFY_ACTION_MODIFIED,
223 FILE_NOTIFY_CHANGE_ATTRIBUTES,
230 static ssize_t tsmsm_sendfile(vfs_handle_struct *handle, int tofd, files_struct *fsp, const DATA_BLOB *hdr,
231 SMB_OFF_T offset, size_t n)
233 bool file_online = tsmsm_aio_force(handle, fsp);
238 return SMB_VFS_NEXT_SENDFILE(handle, tofd, fsp, hdr, offset, n);
241 /* We do overload pread to allow notification when file becomes online after offline status */
242 /* We don't intercept SMB_VFS_READ here because all file I/O now goes through SMB_VFS_PREAD instead */
243 static ssize_t tsmsm_pread(struct vfs_handle_struct *handle, struct files_struct *fsp,
244 void *data, size_t n, SMB_OFF_T offset) {
246 bool notify_online = tsmsm_aio_force(handle, fsp);
248 result = SMB_VFS_NEXT_PREAD(handle, fsp, data, n, offset);
249 if((result != -1) && notify_online) {
250 /* We can't actually force AIO at this point (came here not from reply_read_and_X)
251 what we can do is to send notification that file became online
253 notify_fname(handle->conn, NOTIFY_ACTION_MODIFIED,
254 FILE_NOTIFY_CHANGE_ATTRIBUTES,
261 static ssize_t tsmsm_pwrite(struct vfs_handle_struct *handle, struct files_struct *fsp,
262 void *data, size_t n, SMB_OFF_T offset) {
264 bool notify_online = tsmsm_aio_force(handle, fsp);
266 result = SMB_VFS_NEXT_PWRITE(handle, fsp, data, n, offset);
267 if((result != -1) && notify_online) {
268 /* We can't actually force AIO at this point (came here not from reply_read_and_X)
269 what we can do is to send notification that file became online
271 notify_fname(handle->conn, NOTIFY_ACTION_MODIFIED,
272 FILE_NOTIFY_CHANGE_ATTRIBUTES,
279 static int tsmsm_set_offline(struct vfs_handle_struct *handle,
281 struct tsmsm_struct *tsmd = (struct tsmsm_struct *) handle->data;
285 /* Now, call the script */
286 command = talloc_asprintf(tsmd, "%s offline \"%s\"", tsmd->hsmscript, path);
288 DEBUG(1, ("tsmsm_set_offline: can't allocate memory to run hsm script"));
291 DEBUG(10, ("tsmsm_set_offline: Running [%s]\n", command));
292 if((result = smbrun(command, NULL)) != 0) {
293 DEBUG(1,("tsmsm_set_offline: Running [%s] returned %d\n", command, result));
295 TALLOC_FREE(command);
299 static bool tsmsm_is_remotestorage(struct vfs_handle_struct *handle, const char *path) {
303 static vfs_op_tuple vfs_tsmsm_ops[] = {
305 /* Disk operations */
307 {SMB_VFS_OP(tsmsm_connect), SMB_VFS_OP_CONNECT,
308 SMB_VFS_LAYER_TRANSPARENT},
309 {SMB_VFS_OP(tsmsm_aio_force), SMB_VFS_OP_AIO_FORCE,
310 SMB_VFS_LAYER_TRANSPARENT},
311 {SMB_VFS_OP(tsmsm_aio_return), SMB_VFS_OP_AIO_RETURN,
312 SMB_VFS_LAYER_TRANSPARENT},
313 {SMB_VFS_OP(tsmsm_pread), SMB_VFS_OP_PREAD,
314 SMB_VFS_LAYER_TRANSPARENT},
315 {SMB_VFS_OP(tsmsm_pwrite), SMB_VFS_OP_PWRITE,
316 SMB_VFS_LAYER_TRANSPARENT},
317 {SMB_VFS_OP(tsmsm_sendfile), SMB_VFS_OP_SENDFILE,
318 SMB_VFS_LAYER_TRANSPARENT},
319 {SMB_VFS_OP(tsmsm_is_offline),SMB_VFS_OP_IS_OFFLINE,
320 SMB_VFS_LAYER_OPAQUE},
321 {SMB_VFS_OP(tsmsm_set_offline),SMB_VFS_OP_SET_OFFLINE,
322 SMB_VFS_LAYER_OPAQUE},
323 {SMB_VFS_OP(tsmsm_is_remotestorage),SMB_VFS_OP_IS_REMOTESTORAGE,
324 SMB_VFS_LAYER_OPAQUE},
326 /* Finish VFS operations definition */
328 {SMB_VFS_OP(NULL), SMB_VFS_OP_NOOP,
332 NTSTATUS vfs_tsmsm_init(void);
333 NTSTATUS vfs_tsmsm_init(void)
335 return smb_register_vfs(SMB_VFS_INTERFACE_VERSION,
336 "tsmsm", vfs_tsmsm_ops);