| 1 | .\" Title: vfs_gpfs
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| 2 | .\" Author: [see the "AUTHOR" section]
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| 3 | .\" Generator: DocBook XSL Stylesheets v1.74.0 <http://docbook.sf.net/>
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| 4 | .\" Date: 01/27/2009
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| 5 | .\" Manual: System Administration tools
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| 6 | .\" Source: Samba 3.3
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| 7 | .\" Language: English
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| 8 | .\"
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| 9 | .TH "VFS_GPFS" "8" "01/27/2009" "Samba 3\&.3" "System Administration tools"
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| 10 | .\" -----------------------------------------------------------------
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| 159 | .\" -----------------------------------------------------------------
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| 166 | .\" -----------------------------------------------------------------
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| 167 | .\" * MAIN CONTENT STARTS HERE *
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| 168 | .\" -----------------------------------------------------------------
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| 169 | .SH "Name"
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| 170 | vfs_gpfs \- gpfs specific samba extensions like acls and prealloc
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| 171 | .SH "Synopsis"
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| 172 | .fam C
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| 173 | .HP \w'\ 'u
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| 174 | \FCvfs objects = gpfs\F[]
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| 175 | .fam
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| 176 | .SH "DESCRIPTION"
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| 177 | .PP
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| 178 | This VFS module is part of the
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| 179 | \fBsamba\fR(7)
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| 180 | suite\&.
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| 181 | .PP
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| 182 | The
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| 183 | \FCgpfs\F[]
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| 184 | VFS module is the home for all gpfs extensions that Samba requires for proper integration with GPFS\&. It uses the GPL library interfaces provided by GPFS\&.
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| 185 | .PP
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| 186 | Currently the gpfs vfs module provides extensions in following areas :
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| 187 | .sp
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| 188 | .RS 4
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| 189 | .ie n \{\
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| 190 | \h'-04'\(bu\h'+03'\c
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| 191 | .\}
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| 192 | .el \{\
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| 193 | .sp -1
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| 194 | .IP \(bu 2.3
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| 195 | .\}
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| 196 | NFSv4 ACL Interfaces with configurable options for GPFS
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| 197 | .RE
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| 198 | .sp
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| 199 | .RS 4
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| 200 | .ie n \{\
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| 201 | \h'-04'\(bu\h'+03'\c
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| 202 | .\}
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| 203 | .el \{\
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| 204 | .sp -1
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| 205 | .IP \(bu 2.3
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| 206 | .\}
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| 207 | Kernel oplock support on GPFS
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| 208 | .RE
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| 209 | .sp
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| 210 | .RS 4
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| 211 | .ie n \{\
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| 212 | \h'-04'\(bu\h'+03'\c
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| 213 | .\}
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| 214 | .el \{\
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| 215 | .sp -1
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| 216 | .IP \(bu 2.3
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| 217 | .\}
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| 218 | Lease support on GPFS
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| 219 | .sp
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| 220 | .RE
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| 221 | .PP
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| 222 | \FCNOTE:\F[]This module follows the posix\-acl behaviour and hence allows permission stealing via chown\&. Samba might allow at a later point in time, to restrict the chown via this module as such restrictions are the responsibility of the underlying filesystem than of Samba\&.
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| 223 | .PP
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| 224 | This module is stackable\&.
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| 225 | .SH "OPTIONS"
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| 226 | .PP
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| 227 | nfs4:mode = [ simple | special ]
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| 228 | .RS 4
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| 229 | Enable/Disable substitution of special IDs on GPFS\&. This parameter should not affect the windows users in anyway\&. It only ensures that Samba sets the special IDs \- OWNER@ and GROUP@ ( mappings to simple uids ) that are relevant to GPFS\&.
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| 230 | .sp
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| 231 | The following MODEs are understood by the module:
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| 232 | .sp
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| 233 | .RS 4
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| 234 | .ie n \{\
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| 235 | \h'-04'\(bu\h'+03'\c
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| 236 | .\}
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| 237 | .el \{\
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| 238 | .sp -1
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| 239 | .IP \(bu 2.3
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| 240 | .\}
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| 241 | \FCsimple(default)\F[]
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| 242 | \- do not use special IDs in GPFS ACEs
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| 243 | .RE
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| 244 | .sp
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| 245 | .RS 4
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| 246 | .ie n \{\
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| 247 | \h'-04'\(bu\h'+03'\c
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| 248 | .\}
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| 249 | .el \{\
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| 250 | .sp -1
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| 251 | .IP \(bu 2.3
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| 252 | .\}
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| 253 | \FCspecial\F[]
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| 254 | \- use special IDs in GPFS ACEs\&.
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| 255 | .sp
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| 256 | .RE
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| 257 | .RE
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| 258 | .PP
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| 259 | nfs4:acedup = [dontcare|reject|ignore|merge]
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| 260 | .RS 4
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| 261 | This parameter configures how Samba handles duplicate ACEs encountered in GPFS ACLs\&. GPFS allows/creates duplicate ACE for different bits for same ID\&.
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| 262 | .sp
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| 263 | Following is the behaviour of Samba for different values :
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| 264 | .sp
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| 265 | .RS 4
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| 266 | .ie n \{\
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| 267 | \h'-04'\(bu\h'+03'\c
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| 268 | .\}
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| 269 | .el \{\
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| 270 | .sp -1
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| 271 | .IP \(bu 2.3
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| 272 | .\}
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| 273 | \FCdontcare (default)\F[]
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| 274 | \- copy the ACEs as they come
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| 275 | .RE
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| 276 | .sp
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| 277 | .RS 4
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| 278 | .ie n \{\
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| 279 | \h'-04'\(bu\h'+03'\c
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| 280 | .\}
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| 281 | .el \{\
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| 282 | .sp -1
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| 283 | .IP \(bu 2.3
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| 284 | .\}
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| 285 | \FCreject\F[]
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| 286 | \- stop operation and exit with error on ACL set op
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| 287 | .RE
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| 288 | .sp
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| 289 | .RS 4
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| 290 | .ie n \{\
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| 291 | \h'-04'\(bu\h'+03'\c
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| 292 | .\}
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| 293 | .el \{\
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| 294 | .sp -1
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| 295 | .IP \(bu 2.3
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| 296 | .\}
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| 297 | \FCignore\F[]
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| 298 | \- don\'t include the second matching ACE
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| 299 | .RE
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| 300 | .sp
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| 301 | .RS 4
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| 302 | .ie n \{\
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| 303 | \h'-04'\(bu\h'+03'\c
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| 304 | .\}
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| 305 | .el \{\
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| 306 | .sp -1
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| 307 | .IP \(bu 2.3
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| 308 | .\}
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| 309 | \FCmerge\F[]
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| 310 | \- bitwise OR the 2 ace\&.flag fields and 2 ace\&.mask fields of the 2 duplicate ACEs into 1 ACE
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| 311 | .sp
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| 312 | .RE
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| 313 | .RE
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| 314 | .PP
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| 315 | nfs4:chown = [yes|no]
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| 316 | .RS 4
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| 317 | This parameter allows enabling or disabling the chown supported by the underlying filesystem\&. This parameter should be enabled with care as it might leave your system insecure\&.
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| 318 | .sp
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| 319 | Some filesystems allow chown as a) giving b) stealing\&. It is the latter that is considered a risk\&.
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| 320 | .sp
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| 321 | Following is the behaviour of Samba for different values :
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| 322 | .sp
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| 323 | .RS 4
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| 324 | .ie n \{\
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| 325 | \h'-04'\(bu\h'+03'\c
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| 326 | .\}
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| 327 | .el \{\
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| 328 | .sp -1
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| 329 | .IP \(bu 2.3
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| 330 | .\}
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| 331 | \FCyes\F[]
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| 332 | \- Enable chown if as supported by the under filesystem
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| 333 | .RE
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| 334 | .sp
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| 335 | .RS 4
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| 336 | .ie n \{\
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| 337 | \h'-04'\(bu\h'+03'\c
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| 338 | .\}
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| 339 | .el \{\
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| 340 | .sp -1
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| 341 | .IP \(bu 2.3
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| 342 | .\}
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| 343 | \FCno (default)\F[]
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| 344 | \- Disable chown
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| 345 | .sp
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| 346 | .RE
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| 347 | .RE
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| 348 | .SH "EXAMPLES"
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| 349 | .PP
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| 350 | A GPFS mount can be exported via Samba as follows :
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| 351 | .sp
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| 352 | .if n \{\
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| 353 | .RS 4
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| 354 | .\}
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| 355 | .fam C
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| 356 | .ps -1
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| 357 | .nf
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| 358 | .if t \{\
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| 359 | .sp -1
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| 360 | .\}
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| 361 | .BB lightgray adjust-for-leading-newline
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| 362 | .sp -1
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| 363 |
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| 364 | \fI[samba_gpfs_share]\fR
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| 365 | \m[blue]\fBvfs objects = gpfs\fR\m[]
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| 366 | \m[blue]\fBpath = /test/gpfs_mount\fR\m[]
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| 367 | \m[blue]\fBnfs4: mode = special\fR\m[]
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| 368 | \m[blue]\fBnfs4: acedup = merge\fR\m[]
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| 369 | .EB lightgray adjust-for-leading-newline
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| 370 | .if t \{\
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| 371 | .sp 1
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| 372 | .\}
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| 373 | .fi
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| 374 | .fam
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| 375 | .ps +1
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| 376 | .if n \{\
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| 377 | .RE
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| 378 | .\}
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| 379 | .SH "CAVEATS"
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| 380 | .PP
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| 381 | The gpfs gpl libraries are required by
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| 382 | \FCgpfs\F[]
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| 383 | VFS module during both compilation and runtime\&. Also this VFS module is tested to work on SLES 9/10 and RHEL 4\&.4
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| 384 | .SH "VERSION"
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| 385 | .PP
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| 386 | This man page is correct for version 3\&.0\&.25 of the Samba suite\&.
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| 387 | .SH "AUTHOR"
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| 388 | .PP
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| 389 | The original Samba software and related utilities were created by Andrew Tridgell\&. Samba is now developed by the Samba Team as an Open Source project similar to the way the Linux kernel is developed\&.
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| 390 | .PP
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| 391 | The GPFS VFS module was created with contributions from Volker Lendecke and the developers at IBM\&.
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| 392 | .PP
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| 393 | This manpage was created by the IBM FSCC team
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