4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; if not, write to the
18 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
19 * Boston, MA 021110-1307, USA
24 * Copyright (c) 2013, 2016, Intel Corporation.
25 * Use is subject to license terms.
27 * Author: Di Wang <di.wang@intel.com>
30 #include <lustre/lustre_idl.h>
32 #include <lustre_linkea.h>
34 int linkea_data_new(struct linkea_data *ldata, struct lu_buf *buf)
36 ldata->ld_buf = lu_buf_check_and_alloc(buf, PAGE_SIZE);
37 if (ldata->ld_buf->lb_buf == NULL)
39 ldata->ld_leh = ldata->ld_buf->lb_buf;
40 ldata->ld_leh->leh_magic = LINK_EA_MAGIC;
41 ldata->ld_leh->leh_reccount = 0;
42 ldata->ld_leh->leh_len = sizeof(struct link_ea_header);
43 ldata->ld_leh->leh_overflow_time = 0;
44 ldata->ld_leh->leh_padding = 0;
47 EXPORT_SYMBOL(linkea_data_new);
49 int linkea_init(struct linkea_data *ldata)
51 struct link_ea_header *leh;
53 LASSERT(ldata->ld_buf != NULL);
54 leh = ldata->ld_buf->lb_buf;
55 if (leh->leh_magic == __swab32(LINK_EA_MAGIC)) {
56 leh->leh_magic = LINK_EA_MAGIC;
57 leh->leh_reccount = __swab32(leh->leh_reccount);
58 leh->leh_len = __swab64(leh->leh_len);
59 leh->leh_overflow_time = __swab32(leh->leh_overflow_time);
60 leh->leh_padding = __swab32(leh->leh_padding);
61 /* individual entries are swabbed by linkea_entry_unpack() */
64 if (leh->leh_magic != LINK_EA_MAGIC)
67 if (leh->leh_reccount == 0 && leh->leh_overflow_time == 0)
73 EXPORT_SYMBOL(linkea_init);
75 int linkea_init_with_rec(struct linkea_data *ldata)
79 rc = linkea_init(ldata);
80 if (!rc && ldata->ld_leh->leh_reccount == 0)
85 EXPORT_SYMBOL(linkea_init_with_rec);
88 * Pack a link_ea_entry.
89 * All elements are stored as chars to avoid alignment issues.
90 * Numbers are always big-endian
91 * \retval record length
93 int linkea_entry_pack(struct link_ea_entry *lee, const struct lu_name *lname,
94 const struct lu_fid *pfid)
100 if (OBD_FAIL_CHECK(OBD_FAIL_LFSCK_MUL_REF))
102 if (OBD_FAIL_CHECK(OBD_FAIL_LFSCK_LINKEA_CRASH))
104 fid_cpu_to_be(&tmpfid, &tmpfid);
105 memcpy(&lee->lee_parent_fid, &tmpfid, sizeof(tmpfid));
106 memcpy(lee->lee_name, lname->ln_name, lname->ln_namelen);
107 reclen = sizeof(struct link_ea_entry) + lname->ln_namelen;
109 lee->lee_reclen[0] = (reclen >> 8) & 0xff;
110 lee->lee_reclen[1] = reclen & 0xff;
113 EXPORT_SYMBOL(linkea_entry_pack);
115 void linkea_entry_unpack(const struct link_ea_entry *lee, int *reclen,
116 struct lu_name *lname, struct lu_fid *pfid)
118 LASSERT(lee != NULL);
120 *reclen = (lee->lee_reclen[0] << 8) | lee->lee_reclen[1];
121 memcpy(pfid, &lee->lee_parent_fid, sizeof(*pfid));
122 fid_be_to_cpu(pfid, pfid);
124 lname->ln_name = lee->lee_name;
125 lname->ln_namelen = *reclen - sizeof(struct link_ea_entry);
128 EXPORT_SYMBOL(linkea_entry_unpack);
131 * Add a record to the end of link ea buf
133 int linkea_add_buf(struct linkea_data *ldata, const struct lu_name *lname,
134 const struct lu_fid *pfid)
136 struct link_ea_header *leh = ldata->ld_leh;
139 LASSERT(leh != NULL);
141 if (lname == NULL || pfid == NULL)
144 reclen = lname->ln_namelen + sizeof(struct link_ea_entry);
145 if (unlikely(leh->leh_len + reclen > MAX_LINKEA_SIZE)) {
146 /* Use 32-bits to save the overflow time, although it will
147 * shrink the cfs_time_current_sec() returned 64-bits value
148 * to 32-bits value, it is still quite large and can be used
149 * for about 140 years. That is enough. */
150 leh->leh_overflow_time = cfs_time_current_sec();
151 if (unlikely(leh->leh_overflow_time == 0))
152 leh->leh_overflow_time++;
154 CDEBUG(D_INODE, "No enough space to hold linkea entry '"
155 DFID": %.*s' at %u\n", PFID(pfid), lname->ln_namelen,
156 lname->ln_name, leh->leh_overflow_time);
160 if (leh->leh_len + reclen > ldata->ld_buf->lb_len) {
161 if (lu_buf_check_and_grow(ldata->ld_buf,
162 leh->leh_len + reclen) < 0)
165 leh = ldata->ld_leh = ldata->ld_buf->lb_buf;
168 ldata->ld_lee = ldata->ld_buf->lb_buf + leh->leh_len;
169 ldata->ld_reclen = linkea_entry_pack(ldata->ld_lee, lname, pfid);
170 leh->leh_len += ldata->ld_reclen;
172 CDEBUG(D_INODE, "New link_ea name '"DFID":%.*s' is added\n",
173 PFID(pfid), lname->ln_namelen, lname->ln_name);
176 EXPORT_SYMBOL(linkea_add_buf);
178 /** Del the current record from the link ea buf */
179 void linkea_del_buf(struct linkea_data *ldata, const struct lu_name *lname)
181 LASSERT(ldata->ld_leh != NULL && ldata->ld_lee != NULL);
182 LASSERT(ldata->ld_leh->leh_reccount > 0);
184 ldata->ld_leh->leh_reccount--;
185 ldata->ld_leh->leh_len -= ldata->ld_reclen;
186 memmove(ldata->ld_lee, (char *)ldata->ld_lee + ldata->ld_reclen,
187 (char *)ldata->ld_leh + ldata->ld_leh->leh_len -
188 (char *)ldata->ld_lee);
189 CDEBUG(D_INODE, "Old link_ea name '%.*s' is removed\n",
190 lname->ln_namelen, lname->ln_name);
192 if ((char *)ldata->ld_lee >= ((char *)ldata->ld_leh +
193 ldata->ld_leh->leh_len))
194 ldata->ld_lee = NULL;
196 EXPORT_SYMBOL(linkea_del_buf);
198 int linkea_links_new(struct linkea_data *ldata, struct lu_buf *buf,
199 const struct lu_name *cname, const struct lu_fid *pfid)
203 rc = linkea_data_new(ldata, buf);
205 rc = linkea_add_buf(ldata, cname, pfid);
209 EXPORT_SYMBOL(linkea_links_new);
212 * Mark the linkEA as overflow with current timestamp,
213 * and remove the last linkEA entry.
215 * Return the new linkEA size.
217 int linkea_overflow_shrink(struct linkea_data *ldata)
219 struct link_ea_header *leh;
220 struct lu_name tname;
224 leh = ldata->ld_leh = ldata->ld_buf->lb_buf;
225 if (leh->leh_magic == __swab32(LINK_EA_MAGIC)) {
226 leh->leh_magic = LINK_EA_MAGIC;
227 leh->leh_reccount = __swab32(leh->leh_reccount);
228 leh->leh_overflow_time = __swab32(leh->leh_overflow_time);
229 leh->leh_padding = __swab32(leh->leh_padding);
232 LASSERT(leh->leh_reccount > 0);
234 leh->leh_len = sizeof(struct link_ea_header);
236 if (unlikely(leh->leh_reccount == 0))
239 leh->leh_overflow_time = cfs_time_current_sec();
240 if (unlikely(leh->leh_overflow_time == 0))
241 leh->leh_overflow_time++;
242 ldata->ld_reclen = 0;
243 ldata->ld_lee = (struct link_ea_entry *)(leh + 1);
244 for (count = 0; count < leh->leh_reccount; count++) {
245 linkea_entry_unpack(ldata->ld_lee, &ldata->ld_reclen,
247 leh->leh_len += ldata->ld_reclen;
248 ldata->ld_lee = (struct link_ea_entry *)((char *)ldata->ld_lee +
252 linkea_entry_unpack(ldata->ld_lee, &ldata->ld_reclen, &tname, &tfid);
253 CDEBUG(D_INODE, "No enough space to hold the last linkea entry '"
254 DFID": %.*s', shrink it, left %d linkea entries, size %llu\n",
255 PFID(&tfid), tname.ln_namelen, tname.ln_name,
256 leh->leh_reccount, leh->leh_len);
260 EXPORT_SYMBOL(linkea_overflow_shrink);
263 * Check if such a link exists in linkEA.
265 * \param ldata link data the search to be done on
266 * \param lname name in the parent's directory entry pointing to this object
267 * \param pfid parent fid the link to be found for
270 * \retval -ENOENT link does not exist
271 * \retval -ve on error
273 int linkea_links_find(struct linkea_data *ldata, const struct lu_name *lname,
274 const struct lu_fid *pfid)
276 struct lu_name tmpname;
277 struct lu_fid tmpfid;
280 LASSERT(ldata->ld_leh != NULL);
282 /* link #0, if leh_reccount == 0 we skip the loop and return -ENOENT */
283 if (likely(ldata->ld_leh->leh_reccount > 0))
284 ldata->ld_lee = (struct link_ea_entry *)(ldata->ld_leh + 1);
286 for (count = 0; count < ldata->ld_leh->leh_reccount; count++) {
287 linkea_entry_unpack(ldata->ld_lee, &ldata->ld_reclen,
289 if (tmpname.ln_namelen == lname->ln_namelen &&
290 lu_fid_eq(&tmpfid, pfid) &&
291 (strncmp(tmpname.ln_name, lname->ln_name,
292 tmpname.ln_namelen) == 0))
294 ldata->ld_lee = (struct link_ea_entry *)((char *)ldata->ld_lee +
298 if (count == ldata->ld_leh->leh_reccount) {
299 CDEBUG(D_INODE, "Old link_ea name '%.*s' not found\n",
300 lname->ln_namelen, lname->ln_name);
301 ldata->ld_lee = NULL;
302 ldata->ld_reclen = 0;
307 EXPORT_SYMBOL(linkea_links_find);