| 1 | '\" t
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| 2 | .\" Title: vfs_gpfs
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| 3 | .\" Author: [see the "AUTHOR" section]
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| 4 | .\" Generator: DocBook XSL Stylesheets v1.75.2 <http://docbook.sf.net/>
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| 5 | .\" Date: 01/14/2010
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| 6 | .\" Manual: System Administration tools
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| 7 | .\" Source: Samba 3.3
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| 8 | .\" Language: English
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| 9 | .\"
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| 10 | .TH "VFS_GPFS" "8" "01/14/2010" "Samba 3\&.3" "System Administration tools"
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| 11 | .\" -----------------------------------------------------------------
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| 12 | .\" * set default formatting
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| 13 | .\" -----------------------------------------------------------------
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| 14 | .\" disable hyphenation
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| 15 | .nh
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| 16 | .\" disable justification (adjust text to left margin only)
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| 17 | .ad l
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| 18 | .\" -----------------------------------------------------------------
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| 19 | .\" * MAIN CONTENT STARTS HERE *
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| 20 | .\" -----------------------------------------------------------------
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| 21 | .SH "NAME"
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| 22 | vfs_gpfs \- gpfs specific samba extensions like acls and prealloc
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| 23 | .SH "SYNOPSIS"
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| 24 | .HP \w'\ 'u
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| 25 | vfs objects = gpfs
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| 26 | .SH "DESCRIPTION"
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| 27 | .PP
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| 28 | This VFS module is part of the
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| 29 | \fBsamba\fR(7)
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| 30 | suite\&.
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| 31 | .PP
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| 32 | The
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| 33 | gpfs
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| 34 | 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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| 35 | .PP
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| 36 | Currently the gpfs vfs module provides extensions in following areas :
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| 37 | .sp
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| 38 | .RS 4
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| 39 | .ie n \{\
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| 40 | \h'-04'\(bu\h'+03'\c
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| 41 | .\}
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| 42 | .el \{\
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| 43 | .sp -1
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| 44 | .IP \(bu 2.3
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| 45 | .\}
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| 46 | NFSv4 ACL Interfaces with configurable options for GPFS
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| 47 | .RE
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| 48 | .sp
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| 49 | .RS 4
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| 50 | .ie n \{\
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| 51 | \h'-04'\(bu\h'+03'\c
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| 52 | .\}
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| 53 | .el \{\
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| 54 | .sp -1
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| 55 | .IP \(bu 2.3
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| 56 | .\}
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| 57 | Kernel oplock support on GPFS
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| 58 | .RE
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| 59 | .sp
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| 60 | .RS 4
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| 61 | .ie n \{\
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| 62 | \h'-04'\(bu\h'+03'\c
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| 63 | .\}
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| 64 | .el \{\
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| 65 | .sp -1
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| 66 | .IP \(bu 2.3
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| 67 | .\}
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| 68 | Lease support on GPFS
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| 69 | .sp
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| 70 | .RE
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| 71 | .PP
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| 72 | NOTE: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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| 73 | .PP
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| 74 | This module is stackable\&.
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| 75 | .SH "OPTIONS"
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| 76 | .PP
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| 77 | nfs4:mode = [ simple | special ]
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| 78 | .RS 4
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| 79 | 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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| 80 | .sp
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| 81 | The following MODEs are understood by the module:
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| 82 | .sp
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| 83 | .RS 4
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| 84 | .ie n \{\
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| 85 | \h'-04'\(bu\h'+03'\c
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| 86 | .\}
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| 87 | .el \{\
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| 88 | .sp -1
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| 89 | .IP \(bu 2.3
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| 90 | .\}
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| 91 | simple(default)
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| 92 | \- do not use special IDs in GPFS ACEs
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| 93 | .RE
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| 94 | .sp
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| 95 | .RS 4
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| 96 | .ie n \{\
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| 97 | \h'-04'\(bu\h'+03'\c
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| 98 | .\}
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| 99 | .el \{\
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| 100 | .sp -1
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| 101 | .IP \(bu 2.3
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| 102 | .\}
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| 103 | special
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| 104 | \- use special IDs in GPFS ACEs\&.
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| 105 | .sp
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| 106 | .RE
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| 107 | .RE
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| 108 | .PP
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| 109 | nfs4:acedup = [dontcare|reject|ignore|merge]
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| 110 | .RS 4
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| 111 | 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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| 112 | .sp
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| 113 | Following is the behaviour of Samba for different values :
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| 114 | .sp
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| 115 | .RS 4
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| 116 | .ie n \{\
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| 117 | \h'-04'\(bu\h'+03'\c
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| 118 | .\}
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| 119 | .el \{\
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| 120 | .sp -1
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| 121 | .IP \(bu 2.3
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| 122 | .\}
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| 123 | dontcare (default)
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| 124 | \- copy the ACEs as they come
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| 125 | .RE
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| 126 | .sp
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| 127 | .RS 4
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| 128 | .ie n \{\
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| 129 | \h'-04'\(bu\h'+03'\c
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| 130 | .\}
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| 131 | .el \{\
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| 132 | .sp -1
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| 133 | .IP \(bu 2.3
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| 134 | .\}
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| 135 | reject
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| 136 | \- stop operation and exit with error on ACL set op
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| 137 | .RE
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| 138 | .sp
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| 139 | .RS 4
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| 140 | .ie n \{\
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| 141 | \h'-04'\(bu\h'+03'\c
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| 142 | .\}
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| 143 | .el \{\
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| 144 | .sp -1
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| 145 | .IP \(bu 2.3
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| 146 | .\}
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| 147 | ignore
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| 148 | \- don\'t include the second matching ACE
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| 149 | .RE
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| 150 | .sp
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| 151 | .RS 4
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| 152 | .ie n \{\
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| 153 | \h'-04'\(bu\h'+03'\c
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| 154 | .\}
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| 155 | .el \{\
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| 156 | .sp -1
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| 157 | .IP \(bu 2.3
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| 158 | .\}
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| 159 | merge
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| 160 | \- bitwise OR the 2 ace\&.flag fields and 2 ace\&.mask fields of the 2 duplicate ACEs into 1 ACE
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| 161 | .sp
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| 162 | .RE
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| 163 | .RE
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| 164 | .PP
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| 165 | nfs4:chown = [yes|no]
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| 166 | .RS 4
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| 167 | 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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| 168 | .sp
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| 169 | Some filesystems allow chown as a) giving b) stealing\&. It is the latter that is considered a risk\&.
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| 170 | .sp
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| 171 | Following is the behaviour of Samba for different values :
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| 172 | .sp
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| 173 | .RS 4
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| 174 | .ie n \{\
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| 175 | \h'-04'\(bu\h'+03'\c
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| 176 | .\}
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| 177 | .el \{\
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| 178 | .sp -1
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| 179 | .IP \(bu 2.3
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| 180 | .\}
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| 181 | yes
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| 182 | \- Enable chown if as supported by the under filesystem
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| 183 | .RE
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| 184 | .sp
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| 185 | .RS 4
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| 186 | .ie n \{\
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| 187 | \h'-04'\(bu\h'+03'\c
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| 188 | .\}
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| 189 | .el \{\
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| 190 | .sp -1
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| 191 | .IP \(bu 2.3
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| 192 | .\}
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| 193 | no (default)
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| 194 | \- Disable chown
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| 195 | .sp
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| 196 | .RE
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| 197 | .RE
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| 198 | .SH "EXAMPLES"
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| 199 | .PP
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| 200 | A GPFS mount can be exported via Samba as follows :
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| 201 | .sp
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| 202 | .if n \{\
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| 203 | .RS 4
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| 204 | .\}
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| 205 | .nf
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| 206 | \fI[samba_gpfs_share]\fR
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| 207 | \m[blue]\fBvfs objects = gpfs\fR\m[]
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| 208 | \m[blue]\fBpath = /test/gpfs_mount\fR\m[]
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| 209 | \m[blue]\fBnfs4: mode = special\fR\m[]
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| 210 | \m[blue]\fBnfs4: acedup = merge\fR\m[]
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| 211 | .fi
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| 212 | .if n \{\
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| 213 | .RE
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| 214 | .\}
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| 215 | .SH "CAVEATS"
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| 216 | .PP
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| 217 | The gpfs gpl libraries are required by
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| 218 | gpfs
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| 219 | 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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| 220 | .SH "VERSION"
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| 221 | .PP
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| 222 | This man page is correct for version 3\&.0\&.25 of the Samba suite\&.
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| 223 | .SH "AUTHOR"
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| 224 | .PP
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| 225 | 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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| 226 | .PP
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| 227 | The GPFS VFS module was created with contributions from Volker Lendecke and the developers at IBM\&.
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| 228 | .PP
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| 229 | This manpage was created by the IBM FSCC team
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