1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
4 * Object Devices Class Driver
6 * Copyright (C) 2001-2003 Cluster File Systems, Inc.
8 * This file is part of the Lustre file system, http://www.lustre.org
9 * Lustre is a trademark of Cluster File Systems, Inc.
11 * You may have signed or agreed to another license before downloading
12 * this software. If so, you are bound by the terms and conditions
13 * of that agreement, and the following does not apply to you. See the
14 * LICENSE file included with this distribution for more information.
16 * If you did not agree to a different license, then this copy of Lustre
17 * is open source software; you can redistribute it and/or modify it
18 * under the terms of version 2 of the GNU General Public License as
19 * published by the Free Software Foundation.
21 * In either case, Lustre is distributed in the hope that it will be
22 * useful, but WITHOUT ANY WARRANTY; without even the implied warranty
23 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
24 * license text for more details.
26 * These are the only exported functions, they provide some generic
27 * infrastructure for managing object devices
30 #define DEBUG_SUBSYSTEM S_CLASS
32 # define EXPORT_SYMTAB
36 #include <liblustre.h>
38 #include <linux/module.h>
39 #include <obd_class.h>
40 #include <lustre/lustre_idl.h>
45 #include <linux/pagemap.h> /* for PAGE_CACHE_SIZE */
47 void obdo_from_iattr(struct obdo *oa, struct iattr *attr, unsigned int ia_valid)
49 if (ia_valid & ATTR_ATIME) {
50 oa->o_atime = LTIME_S(attr->ia_atime);
51 oa->o_valid |= OBD_MD_FLATIME;
53 if (ia_valid & ATTR_MTIME) {
54 oa->o_mtime = LTIME_S(attr->ia_mtime);
55 oa->o_valid |= OBD_MD_FLMTIME;
57 if (ia_valid & ATTR_CTIME) {
58 oa->o_ctime = LTIME_S(attr->ia_ctime);
59 oa->o_valid |= OBD_MD_FLCTIME;
61 if (ia_valid & ATTR_SIZE) {
62 oa->o_size = attr->ia_size;
63 oa->o_valid |= OBD_MD_FLSIZE;
65 if (ia_valid & ATTR_MODE) {
66 oa->o_mode = attr->ia_mode;
67 oa->o_valid |= OBD_MD_FLTYPE | OBD_MD_FLMODE;
68 if (!in_group_p(oa->o_gid) && !capable(CAP_FSETID))
69 oa->o_mode &= ~S_ISGID;
71 if (ia_valid & ATTR_UID) {
72 oa->o_uid = attr->ia_uid;
73 oa->o_valid |= OBD_MD_FLUID;
75 if (ia_valid & ATTR_GID) {
76 oa->o_gid = attr->ia_gid;
77 oa->o_valid |= OBD_MD_FLGID;
80 EXPORT_SYMBOL(obdo_from_iattr);
82 void iattr_from_obdo(struct iattr *attr, struct obdo *oa, obd_flag valid)
86 if (valid & (OBD_MD_FLCTIME | OBD_MD_FLMTIME))
87 CDEBUG(D_INODE, "valid "LPX64", new time "LPU64"/"LPU64"\n",
88 oa->o_valid, oa->o_mtime, oa->o_ctime);
91 if (valid & OBD_MD_FLATIME) {
92 LTIME_S(attr->ia_atime) = oa->o_atime;
93 attr->ia_valid |= ATTR_ATIME;
95 if (valid & OBD_MD_FLMTIME) {
96 LTIME_S(attr->ia_mtime) = oa->o_mtime;
97 attr->ia_valid |= ATTR_MTIME;
99 if (valid & OBD_MD_FLCTIME) {
100 LTIME_S(attr->ia_ctime) = oa->o_ctime;
101 attr->ia_valid |= ATTR_CTIME;
103 if (valid & OBD_MD_FLSIZE) {
104 attr->ia_size = oa->o_size;
105 attr->ia_valid |= ATTR_SIZE;
107 #if 0 /* you shouldn't be able to change a file's type with setattr */
108 if (valid & OBD_MD_FLTYPE) {
109 attr->ia_mode = (attr->ia_mode & ~S_IFMT)|(oa->o_mode & S_IFMT);
110 attr->ia_valid |= ATTR_MODE;
113 if (valid & OBD_MD_FLMODE) {
114 attr->ia_mode = (attr->ia_mode & S_IFMT)|(oa->o_mode & ~S_IFMT);
115 attr->ia_valid |= ATTR_MODE;
116 if (!in_group_p(oa->o_gid) && !capable(CAP_FSETID))
117 attr->ia_mode &= ~S_ISGID;
119 if (valid & OBD_MD_FLUID) {
120 attr->ia_uid = oa->o_uid;
121 attr->ia_valid |= ATTR_UID;
123 if (valid & OBD_MD_FLGID) {
124 attr->ia_gid = oa->o_gid;
125 attr->ia_valid |= ATTR_GID;
128 EXPORT_SYMBOL(iattr_from_obdo);
130 /* WARNING: the file systems must take care not to tinker with
131 attributes they don't manage (such as blocks). */
132 void obdo_from_inode(struct obdo *dst, struct inode *src, obd_flag valid)
134 obd_flag newvalid = 0;
136 if (valid & (OBD_MD_FLCTIME | OBD_MD_FLMTIME))
137 CDEBUG(D_INODE, "valid %x, new time %lu/%lu\n",
138 valid, LTIME_S(src->i_mtime),
139 LTIME_S(src->i_ctime));
141 if (valid & OBD_MD_FLATIME) {
142 dst->o_atime = LTIME_S(src->i_atime);
143 newvalid |= OBD_MD_FLATIME;
145 if (valid & OBD_MD_FLMTIME) {
146 dst->o_mtime = LTIME_S(src->i_mtime);
147 newvalid |= OBD_MD_FLMTIME;
149 if (valid & OBD_MD_FLCTIME) {
150 dst->o_ctime = LTIME_S(src->i_ctime);
151 newvalid |= OBD_MD_FLCTIME;
153 if (valid & OBD_MD_FLSIZE) {
154 dst->o_size = src->i_size;
155 newvalid |= OBD_MD_FLSIZE;
157 if (valid & OBD_MD_FLBLOCKS) { /* allocation of space (x512 bytes) */
158 dst->o_blocks = src->i_blocks;
159 newvalid |= OBD_MD_FLBLOCKS;
161 if (valid & OBD_MD_FLBLKSZ) { /* optimal block size */
162 dst->o_blksize = 1<<src->i_blkbits;
163 newvalid |= OBD_MD_FLBLKSZ;
165 if (valid & OBD_MD_FLTYPE) {
166 dst->o_mode = (dst->o_mode & S_IALLUGO)|(src->i_mode & S_IFMT);
167 newvalid |= OBD_MD_FLTYPE;
169 if (valid & OBD_MD_FLMODE) {
170 dst->o_mode = (dst->o_mode & S_IFMT)|(src->i_mode & S_IALLUGO);
171 newvalid |= OBD_MD_FLMODE;
173 if (valid & OBD_MD_FLUID) {
174 dst->o_uid = src->i_uid;
175 newvalid |= OBD_MD_FLUID;
177 if (valid & OBD_MD_FLGID) {
178 dst->o_gid = src->i_gid;
179 newvalid |= OBD_MD_FLGID;
181 if (valid & OBD_MD_FLFLAGS) {
182 dst->o_flags = src->i_flags;
183 newvalid |= OBD_MD_FLFLAGS;
185 if (valid & OBD_MD_FLGENER) {
186 dst->o_generation = src->i_generation;
187 newvalid |= OBD_MD_FLGENER;
189 if (valid & OBD_MD_FLFID) {
190 dst->o_fid = src->i_ino;
191 newvalid |= OBD_MD_FLFID;
194 dst->o_valid |= newvalid;
196 EXPORT_SYMBOL(obdo_from_inode);
198 void obdo_refresh_inode(struct inode *dst, struct obdo *src, obd_flag valid)
200 valid &= src->o_valid;
202 if (valid & (OBD_MD_FLCTIME | OBD_MD_FLMTIME))
204 "valid "LPX64", cur time %lu/%lu, new "LPU64"/"LPU64"\n",
205 src->o_valid, LTIME_S(dst->i_mtime),
206 LTIME_S(dst->i_ctime), src->o_mtime, src->o_ctime);
208 if (valid & OBD_MD_FLATIME && src->o_atime > LTIME_S(dst->i_atime))
209 LTIME_S(dst->i_atime) = src->o_atime;
211 /* mtime is always updated with ctime, but can be set in past.
212 As write and utime(2) may happen within 1 second, and utime's
213 mtime has a priority over write's one, leave mtime from mds
214 for the same ctimes. */
215 if (valid & OBD_MD_FLCTIME && src->o_ctime > LTIME_S(dst->i_ctime)) {
216 LTIME_S(dst->i_ctime) = src->o_ctime;
217 if (valid & OBD_MD_FLMTIME)
218 LTIME_S(dst->i_mtime) = src->o_mtime;
220 if (valid & OBD_MD_FLSIZE)
221 dst->i_size = src->o_size;
222 /* optimum IO size */
223 if (valid & OBD_MD_FLBLKSZ && src->o_blksize > (1<<dst->i_blkbits)) {
224 dst->i_blkbits = ffs(src->o_blksize)-1;
225 #ifdef HAVE_INODE_BLKSIZE
226 dst->i_blksize = src->o_blksize;
230 if (dst->i_blkbits < CFS_PAGE_SHIFT) {
231 #ifdef HAVE_INODE_BLKSIZE
232 dst->i_blksize = CFS_PAGE_SIZE;
234 dst->i_blkbits = CFS_PAGE_SHIFT;
237 /* allocation of space */
238 if (valid & OBD_MD_FLBLOCKS && src->o_blocks > dst->i_blocks)
239 dst->i_blocks = src->o_blocks;
241 EXPORT_SYMBOL(obdo_refresh_inode);
243 void obdo_to_inode(struct inode *dst, struct obdo *src, obd_flag valid)
245 valid &= src->o_valid;
247 if (valid & (OBD_MD_FLCTIME | OBD_MD_FLMTIME))
249 "valid "LPX64", cur time %lu/%lu, new "LPU64"/"LPU64"\n",
250 src->o_valid, LTIME_S(dst->i_mtime),
251 LTIME_S(dst->i_ctime), src->o_mtime, src->o_ctime);
253 if (valid & OBD_MD_FLATIME)
254 LTIME_S(dst->i_atime) = src->o_atime;
255 if (valid & OBD_MD_FLMTIME)
256 LTIME_S(dst->i_mtime) = src->o_mtime;
257 if (valid & OBD_MD_FLCTIME && src->o_ctime > LTIME_S(dst->i_ctime))
258 LTIME_S(dst->i_ctime) = src->o_ctime;
259 if (valid & OBD_MD_FLSIZE)
260 dst->i_size = src->o_size;
261 if (valid & OBD_MD_FLBLOCKS) { /* allocation of space */
262 dst->i_blocks = src->o_blocks;
263 if (dst->i_blocks < src->o_blocks) /* overflow */
267 if (valid & OBD_MD_FLBLKSZ) {
268 dst->i_blkbits = ffs(src->o_blksize)-1;
269 #ifdef HAVE_INODE_BLKSIZE
270 dst->i_blksize = src->o_blksize;
273 if (valid & OBD_MD_FLTYPE)
274 dst->i_mode = (dst->i_mode & ~S_IFMT) | (src->o_mode & S_IFMT);
275 if (valid & OBD_MD_FLMODE)
276 dst->i_mode = (dst->i_mode & S_IFMT) | (src->o_mode & ~S_IFMT);
277 if (valid & OBD_MD_FLUID)
278 dst->i_uid = src->o_uid;
279 if (valid & OBD_MD_FLGID)
280 dst->i_gid = src->o_gid;
281 if (valid & OBD_MD_FLFLAGS)
282 dst->i_flags = src->o_flags;
283 if (valid & OBD_MD_FLGENER)
284 dst->i_generation = src->o_generation;
286 EXPORT_SYMBOL(obdo_to_inode);