1 // SPDX-License-Identifier: GPL-2.0 1 // SPDX-License-Identifier: GPL-2.0
2 /* 2 /*
3 * Copyright (c) 2000-2005 Silicon Graphics, I 3 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
4 * All Rights Reserved. 4 * All Rights Reserved.
5 */ 5 */
6 #include "xfs.h" 6 #include "xfs.h"
7 #include "xfs_fs.h" 7 #include "xfs_fs.h"
8 #include "xfs_shared.h" 8 #include "xfs_shared.h"
9 #include "xfs_format.h" 9 #include "xfs_format.h"
10 #include "xfs_log_format.h" 10 #include "xfs_log_format.h"
11 #include "xfs_trans_resv.h" 11 #include "xfs_trans_resv.h"
12 #include "xfs_sb.h" 12 #include "xfs_sb.h"
13 #include "xfs_mount.h" 13 #include "xfs_mount.h"
14 #include "xfs_trans.h" 14 #include "xfs_trans.h"
15 #include "xfs_error.h" 15 #include "xfs_error.h"
16 #include "xfs_alloc.h" 16 #include "xfs_alloc.h"
17 #include "xfs_fsops.h" 17 #include "xfs_fsops.h"
18 #include "xfs_trans_space.h" 18 #include "xfs_trans_space.h"
19 #include "xfs_log.h" 19 #include "xfs_log.h"
20 #include "xfs_log_priv.h" 20 #include "xfs_log_priv.h"
21 #include "xfs_ag.h" 21 #include "xfs_ag.h"
22 #include "xfs_ag_resv.h" 22 #include "xfs_ag_resv.h"
23 #include "xfs_trace.h" 23 #include "xfs_trace.h"
24 24
25 /* 25 /*
26 * Write new AG headers to disk. Non-transacti 26 * Write new AG headers to disk. Non-transactional, but need to be
27 * written and completed prior to the growfs t 27 * written and completed prior to the growfs transaction being logged.
28 * To do this, we use a delayed write buffer l 28 * To do this, we use a delayed write buffer list and wait for
29 * submission and IO completion of the list as 29 * submission and IO completion of the list as a whole. This allows the
30 * IO subsystem to merge all the AG headers in 30 * IO subsystem to merge all the AG headers in a single AG into a single
31 * IO and hide most of the latency of the IO f 31 * IO and hide most of the latency of the IO from us.
32 * 32 *
33 * This also means that if we get an error whi 33 * This also means that if we get an error whilst building the buffer
34 * list to write, we can cancel the entire lis 34 * list to write, we can cancel the entire list without having written
35 * anything. 35 * anything.
36 */ 36 */
37 static int 37 static int
38 xfs_resizefs_init_new_ags( 38 xfs_resizefs_init_new_ags(
39 struct xfs_trans *tp, 39 struct xfs_trans *tp,
40 struct aghdr_init_data *id, 40 struct aghdr_init_data *id,
41 xfs_agnumber_t oagcount, 41 xfs_agnumber_t oagcount,
42 xfs_agnumber_t nagcount, 42 xfs_agnumber_t nagcount,
43 xfs_rfsblock_t delta, 43 xfs_rfsblock_t delta,
44 struct xfs_perag *last_pag, 44 struct xfs_perag *last_pag,
45 bool *lastag_extend 45 bool *lastag_extended)
46 { 46 {
47 struct xfs_mount *mp = tp->t_mo 47 struct xfs_mount *mp = tp->t_mountp;
48 xfs_rfsblock_t nb = mp->m_sb. 48 xfs_rfsblock_t nb = mp->m_sb.sb_dblocks + delta;
49 int error; 49 int error;
50 50
51 *lastag_extended = false; 51 *lastag_extended = false;
52 52
53 INIT_LIST_HEAD(&id->buffer_list); 53 INIT_LIST_HEAD(&id->buffer_list);
54 for (id->agno = nagcount - 1; 54 for (id->agno = nagcount - 1;
55 id->agno >= oagcount; 55 id->agno >= oagcount;
56 id->agno--, delta -= id->agsize) 56 id->agno--, delta -= id->agsize) {
57 57
58 if (id->agno == nagcount - 1) 58 if (id->agno == nagcount - 1)
59 id->agsize = nb - (id- 59 id->agsize = nb - (id->agno *
60 (xfs_r 60 (xfs_rfsblock_t)mp->m_sb.sb_agblocks);
61 else 61 else
62 id->agsize = mp->m_sb. 62 id->agsize = mp->m_sb.sb_agblocks;
63 63
64 error = xfs_ag_init_headers(mp 64 error = xfs_ag_init_headers(mp, id);
65 if (error) { 65 if (error) {
66 xfs_buf_delwri_cancel( 66 xfs_buf_delwri_cancel(&id->buffer_list);
67 return error; 67 return error;
68 } 68 }
69 } 69 }
70 70
71 error = xfs_buf_delwri_submit(&id->buf 71 error = xfs_buf_delwri_submit(&id->buffer_list);
72 if (error) 72 if (error)
73 return error; 73 return error;
74 74
75 if (delta) { 75 if (delta) {
76 *lastag_extended = true; 76 *lastag_extended = true;
77 error = xfs_ag_extend_space(la 77 error = xfs_ag_extend_space(last_pag, tp, delta);
78 } 78 }
79 return error; 79 return error;
80 } 80 }
81 81
82 /* 82 /*
83 * growfs operations 83 * growfs operations
84 */ 84 */
85 static int 85 static int
86 xfs_growfs_data_private( 86 xfs_growfs_data_private(
87 struct xfs_mount *mp, 87 struct xfs_mount *mp, /* mount point for filesystem */
88 struct xfs_growfs_data *in) 88 struct xfs_growfs_data *in) /* growfs data input struct */
89 { 89 {
90 xfs_agnumber_t oagcount = mp- 90 xfs_agnumber_t oagcount = mp->m_sb.sb_agcount;
91 struct xfs_buf *bp; 91 struct xfs_buf *bp;
92 int error; 92 int error;
93 xfs_agnumber_t nagcount; 93 xfs_agnumber_t nagcount;
94 xfs_agnumber_t nagimax = 0; 94 xfs_agnumber_t nagimax = 0;
95 xfs_rfsblock_t nb, nb_div, nb 95 xfs_rfsblock_t nb, nb_div, nb_mod;
96 int64_t delta; 96 int64_t delta;
97 bool lastag_extende 97 bool lastag_extended = false;
98 struct xfs_trans *tp; 98 struct xfs_trans *tp;
99 struct aghdr_init_data id = {}; 99 struct aghdr_init_data id = {};
100 struct xfs_perag *last_pag; 100 struct xfs_perag *last_pag;
101 101
102 nb = in->newblocks; 102 nb = in->newblocks;
103 error = xfs_sb_validate_fsb_count(&mp- 103 error = xfs_sb_validate_fsb_count(&mp->m_sb, nb);
104 if (error) 104 if (error)
105 return error; 105 return error;
106 106
107 if (nb > mp->m_sb.sb_dblocks) { 107 if (nb > mp->m_sb.sb_dblocks) {
108 error = xfs_buf_read_uncached( 108 error = xfs_buf_read_uncached(mp->m_ddev_targp,
109 XFS_FSB_TO_BB( 109 XFS_FSB_TO_BB(mp, nb) - XFS_FSS_TO_BB(mp, 1),
110 XFS_FSS_TO_BB( 110 XFS_FSS_TO_BB(mp, 1), 0, &bp, NULL);
111 if (error) 111 if (error)
112 return error; 112 return error;
113 xfs_buf_relse(bp); 113 xfs_buf_relse(bp);
114 } 114 }
115 115
116 nb_div = nb; 116 nb_div = nb;
117 nb_mod = do_div(nb_div, mp->m_sb.sb_ag 117 nb_mod = do_div(nb_div, mp->m_sb.sb_agblocks);
118 if (nb_mod && nb_mod >= XFS_MIN_AG_BLO 118 if (nb_mod && nb_mod >= XFS_MIN_AG_BLOCKS)
119 nb_div++; 119 nb_div++;
120 else if (nb_mod) 120 else if (nb_mod)
121 nb = nb_div * mp->m_sb.sb_agbl 121 nb = nb_div * mp->m_sb.sb_agblocks;
122 122
123 if (nb_div > XFS_MAX_AGNUMBER + 1) { 123 if (nb_div > XFS_MAX_AGNUMBER + 1) {
124 nb_div = XFS_MAX_AGNUMBER + 1; 124 nb_div = XFS_MAX_AGNUMBER + 1;
125 nb = nb_div * mp->m_sb.sb_agbl 125 nb = nb_div * mp->m_sb.sb_agblocks;
126 } 126 }
127 nagcount = nb_div; 127 nagcount = nb_div;
128 delta = nb - mp->m_sb.sb_dblocks; 128 delta = nb - mp->m_sb.sb_dblocks;
129 /* 129 /*
130 * Reject filesystems with a single AG 130 * Reject filesystems with a single AG because they are not
131 * supported, and reject a shrink oper 131 * supported, and reject a shrink operation that would cause a
132 * filesystem to become unsupported. 132 * filesystem to become unsupported.
133 */ 133 */
134 if (delta < 0 && nagcount < 2) 134 if (delta < 0 && nagcount < 2)
135 return -EINVAL; 135 return -EINVAL;
136 136
137 /* No work to do */ 137 /* No work to do */
138 if (delta == 0) 138 if (delta == 0)
139 return 0; 139 return 0;
140 140
141 /* TODO: shrinking the entire AGs hasn 141 /* TODO: shrinking the entire AGs hasn't yet completed */
142 if (nagcount < oagcount) 142 if (nagcount < oagcount)
143 return -EINVAL; 143 return -EINVAL;
144 144
145 /* allocate the new per-ag structures 145 /* allocate the new per-ag structures */
146 error = xfs_initialize_perag(mp, oagco 146 error = xfs_initialize_perag(mp, oagcount, nagcount, nb, &nagimax);
147 if (error) 147 if (error)
148 return error; 148 return error;
149 149
150 if (delta > 0) 150 if (delta > 0)
151 error = xfs_trans_alloc(mp, &M 151 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_growdata,
152 XFS_GROWFS_SPA 152 XFS_GROWFS_SPACE_RES(mp), 0, XFS_TRANS_RESERVE,
153 &tp); 153 &tp);
154 else 154 else
155 error = xfs_trans_alloc(mp, &M 155 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_growdata, -delta, 0,
156 0, &tp); 156 0, &tp);
157 if (error) 157 if (error)
158 goto out_free_unused_perag; 158 goto out_free_unused_perag;
159 159
160 last_pag = xfs_perag_get(mp, oagcount 160 last_pag = xfs_perag_get(mp, oagcount - 1);
161 if (delta > 0) { 161 if (delta > 0) {
162 error = xfs_resizefs_init_new_ 162 error = xfs_resizefs_init_new_ags(tp, &id, oagcount, nagcount,
163 delta, last_pa 163 delta, last_pag, &lastag_extended);
164 } else { 164 } else {
165 xfs_warn_mount(mp, XFS_OPSTATE 165 xfs_warn_mount(mp, XFS_OPSTATE_WARNED_SHRINK,
166 "EXPERIMENTAL online shrink feature in 166 "EXPERIMENTAL online shrink feature in use. Use at your own risk!");
167 167
168 error = xfs_ag_shrink_space(la 168 error = xfs_ag_shrink_space(last_pag, &tp, -delta);
169 } 169 }
170 xfs_perag_put(last_pag); 170 xfs_perag_put(last_pag);
171 if (error) 171 if (error)
172 goto out_trans_cancel; 172 goto out_trans_cancel;
173 173
174 /* 174 /*
175 * Update changed superblock fields tr 175 * Update changed superblock fields transactionally. These are not
176 * seen by the rest of the world until 176 * seen by the rest of the world until the transaction commit applies
177 * them atomically to the superblock. 177 * them atomically to the superblock.
178 */ 178 */
179 if (nagcount > oagcount) 179 if (nagcount > oagcount)
180 xfs_trans_mod_sb(tp, XFS_TRANS 180 xfs_trans_mod_sb(tp, XFS_TRANS_SB_AGCOUNT, nagcount - oagcount);
181 if (delta) 181 if (delta)
182 xfs_trans_mod_sb(tp, XFS_TRANS 182 xfs_trans_mod_sb(tp, XFS_TRANS_SB_DBLOCKS, delta);
183 if (id.nfree) 183 if (id.nfree)
184 xfs_trans_mod_sb(tp, XFS_TRANS 184 xfs_trans_mod_sb(tp, XFS_TRANS_SB_FDBLOCKS, id.nfree);
185 185
186 /* 186 /*
187 * Sync sb counters now to reflect the 187 * Sync sb counters now to reflect the updated values. This is
188 * particularly important for shrink b 188 * particularly important for shrink because the write verifier
189 * will fail if sb_fdblocks is ever la 189 * will fail if sb_fdblocks is ever larger than sb_dblocks.
190 */ 190 */
191 if (xfs_has_lazysbcount(mp)) 191 if (xfs_has_lazysbcount(mp))
192 xfs_log_sb(tp); 192 xfs_log_sb(tp);
193 193
194 xfs_trans_set_sync(tp); 194 xfs_trans_set_sync(tp);
195 error = xfs_trans_commit(tp); 195 error = xfs_trans_commit(tp);
196 if (error) 196 if (error)
197 return error; 197 return error;
198 198
199 /* New allocation groups fully initial 199 /* New allocation groups fully initialized, so update mount struct */
200 if (nagimax) 200 if (nagimax)
201 mp->m_maxagi = nagimax; 201 mp->m_maxagi = nagimax;
202 xfs_set_low_space_thresholds(mp); 202 xfs_set_low_space_thresholds(mp);
203 mp->m_alloc_set_aside = xfs_alloc_set_ 203 mp->m_alloc_set_aside = xfs_alloc_set_aside(mp);
204 204
205 if (delta > 0) { 205 if (delta > 0) {
206 /* 206 /*
207 * If we expanded the last AG, 207 * If we expanded the last AG, free the per-AG reservation
208 * so we can reinitialize it w 208 * so we can reinitialize it with the new size.
209 */ 209 */
210 if (lastag_extended) { 210 if (lastag_extended) {
211 struct xfs_perag 211 struct xfs_perag *pag;
212 212
213 pag = xfs_perag_get(mp 213 pag = xfs_perag_get(mp, id.agno);
214 xfs_ag_resv_free(pag); 214 xfs_ag_resv_free(pag);
215 xfs_perag_put(pag); 215 xfs_perag_put(pag);
216 } 216 }
217 /* 217 /*
218 * Reserve AG metadata blocks. 218 * Reserve AG metadata blocks. ENOSPC here does not mean there
219 * was a growfs failure, just 219 * was a growfs failure, just that there still isn't space for
220 * new user data after the gro 220 * new user data after the grow has been run.
221 */ 221 */
222 error = xfs_fs_reserve_ag_bloc 222 error = xfs_fs_reserve_ag_blocks(mp);
223 if (error == -ENOSPC) 223 if (error == -ENOSPC)
224 error = 0; 224 error = 0;
225 } 225 }
226 return error; 226 return error;
227 227
228 out_trans_cancel: 228 out_trans_cancel:
229 xfs_trans_cancel(tp); 229 xfs_trans_cancel(tp);
230 out_free_unused_perag: 230 out_free_unused_perag:
231 if (nagcount > oagcount) 231 if (nagcount > oagcount)
232 xfs_free_perag_range(mp, oagco 232 xfs_free_perag_range(mp, oagcount, nagcount);
233 return error; 233 return error;
234 } 234 }
235 235
236 static int 236 static int
237 xfs_growfs_log_private( 237 xfs_growfs_log_private(
238 struct xfs_mount *mp, /* mou 238 struct xfs_mount *mp, /* mount point for filesystem */
239 struct xfs_growfs_log *in) /* gro 239 struct xfs_growfs_log *in) /* growfs log input struct */
240 { 240 {
241 xfs_extlen_t nb; 241 xfs_extlen_t nb;
242 242
243 nb = in->newblocks; 243 nb = in->newblocks;
244 if (nb < XFS_MIN_LOG_BLOCKS || nb < XF 244 if (nb < XFS_MIN_LOG_BLOCKS || nb < XFS_B_TO_FSB(mp, XFS_MIN_LOG_BYTES))
245 return -EINVAL; 245 return -EINVAL;
246 if (nb == mp->m_sb.sb_logblocks && 246 if (nb == mp->m_sb.sb_logblocks &&
247 in->isint == (mp->m_sb.sb_logstart 247 in->isint == (mp->m_sb.sb_logstart != 0))
248 return -EINVAL; 248 return -EINVAL;
249 /* 249 /*
250 * Moving the log is hard, need new in 250 * Moving the log is hard, need new interfaces to sync
251 * the log first, hold off all activit 251 * the log first, hold off all activity while moving it.
252 * Can have shorter or longer log in t 252 * Can have shorter or longer log in the same space,
253 * or transform internal to external l 253 * or transform internal to external log or vice versa.
254 */ 254 */
255 return -ENOSYS; 255 return -ENOSYS;
256 } 256 }
257 257
258 static int 258 static int
259 xfs_growfs_imaxpct( 259 xfs_growfs_imaxpct(
260 struct xfs_mount *mp, 260 struct xfs_mount *mp,
261 __u32 imaxpct) 261 __u32 imaxpct)
262 { 262 {
263 struct xfs_trans *tp; 263 struct xfs_trans *tp;
264 int dpct; 264 int dpct;
265 int error; 265 int error;
266 266
267 if (imaxpct > 100) 267 if (imaxpct > 100)
268 return -EINVAL; 268 return -EINVAL;
269 269
270 error = xfs_trans_alloc(mp, &M_RES(mp) 270 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_growdata,
271 XFS_GROWFS_SPACE_RES(m 271 XFS_GROWFS_SPACE_RES(mp), 0, XFS_TRANS_RESERVE, &tp);
272 if (error) 272 if (error)
273 return error; 273 return error;
274 274
275 dpct = imaxpct - mp->m_sb.sb_imax_pct; 275 dpct = imaxpct - mp->m_sb.sb_imax_pct;
276 xfs_trans_mod_sb(tp, XFS_TRANS_SB_IMAX 276 xfs_trans_mod_sb(tp, XFS_TRANS_SB_IMAXPCT, dpct);
277 xfs_trans_set_sync(tp); 277 xfs_trans_set_sync(tp);
278 return xfs_trans_commit(tp); 278 return xfs_trans_commit(tp);
279 } 279 }
280 280
281 /* 281 /*
282 * protected versions of growfs function acqui 282 * protected versions of growfs function acquire and release locks on the mount
283 * point - exported through ioctls: XFS_IOC_FS 283 * point - exported through ioctls: XFS_IOC_FSGROWFSDATA, XFS_IOC_FSGROWFSLOG,
284 * XFS_IOC_FSGROWFSRT 284 * XFS_IOC_FSGROWFSRT
285 */ 285 */
286 int 286 int
287 xfs_growfs_data( 287 xfs_growfs_data(
288 struct xfs_mount *mp, 288 struct xfs_mount *mp,
289 struct xfs_growfs_data *in) 289 struct xfs_growfs_data *in)
290 { 290 {
291 int error = 0; 291 int error = 0;
292 292
293 if (!capable(CAP_SYS_ADMIN)) 293 if (!capable(CAP_SYS_ADMIN))
294 return -EPERM; 294 return -EPERM;
295 if (!mutex_trylock(&mp->m_growlock)) 295 if (!mutex_trylock(&mp->m_growlock))
296 return -EWOULDBLOCK; 296 return -EWOULDBLOCK;
297 297
298 /* update imaxpct separately to the ph 298 /* update imaxpct separately to the physical grow of the filesystem */
299 if (in->imaxpct != mp->m_sb.sb_imax_pc 299 if (in->imaxpct != mp->m_sb.sb_imax_pct) {
300 error = xfs_growfs_imaxpct(mp, 300 error = xfs_growfs_imaxpct(mp, in->imaxpct);
301 if (error) 301 if (error)
302 goto out_error; 302 goto out_error;
303 } 303 }
304 304
305 if (in->newblocks != mp->m_sb.sb_dbloc 305 if (in->newblocks != mp->m_sb.sb_dblocks) {
306 error = xfs_growfs_data_privat 306 error = xfs_growfs_data_private(mp, in);
307 if (error) 307 if (error)
308 goto out_error; 308 goto out_error;
309 } 309 }
310 310
311 /* Post growfs calculations needed to 311 /* Post growfs calculations needed to reflect new state in operations */
312 if (mp->m_sb.sb_imax_pct) { 312 if (mp->m_sb.sb_imax_pct) {
313 uint64_t icount = mp->m_sb.sb_ 313 uint64_t icount = mp->m_sb.sb_dblocks * mp->m_sb.sb_imax_pct;
314 do_div(icount, 100); 314 do_div(icount, 100);
315 M_IGEO(mp)->maxicount = XFS_FS 315 M_IGEO(mp)->maxicount = XFS_FSB_TO_INO(mp, icount);
316 } else 316 } else
317 M_IGEO(mp)->maxicount = 0; 317 M_IGEO(mp)->maxicount = 0;
318 318
319 /* Update secondary superblocks now th 319 /* Update secondary superblocks now the physical grow has completed */
320 error = xfs_update_secondary_sbs(mp); 320 error = xfs_update_secondary_sbs(mp);
321 321
322 out_error: 322 out_error:
323 /* 323 /*
324 * Increment the generation unconditio 324 * Increment the generation unconditionally, the error could be from
325 * updating the secondary superblocks, 325 * updating the secondary superblocks, in which case the new size
326 * is live already. 326 * is live already.
327 */ 327 */
328 mp->m_generation++; 328 mp->m_generation++;
329 mutex_unlock(&mp->m_growlock); 329 mutex_unlock(&mp->m_growlock);
330 return error; 330 return error;
331 } 331 }
332 332
333 int 333 int
334 xfs_growfs_log( 334 xfs_growfs_log(
335 xfs_mount_t *mp, 335 xfs_mount_t *mp,
336 struct xfs_growfs_log *in) 336 struct xfs_growfs_log *in)
337 { 337 {
338 int error; 338 int error;
339 339
340 if (!capable(CAP_SYS_ADMIN)) 340 if (!capable(CAP_SYS_ADMIN))
341 return -EPERM; 341 return -EPERM;
342 if (!mutex_trylock(&mp->m_growlock)) 342 if (!mutex_trylock(&mp->m_growlock))
343 return -EWOULDBLOCK; 343 return -EWOULDBLOCK;
344 error = xfs_growfs_log_private(mp, in) 344 error = xfs_growfs_log_private(mp, in);
345 mutex_unlock(&mp->m_growlock); 345 mutex_unlock(&mp->m_growlock);
346 return error; 346 return error;
347 } 347 }
348 348
349 /* 349 /*
350 * Reserve the requested number of blocks if a 350 * Reserve the requested number of blocks if available. Otherwise return
351 * as many as possible to satisfy the request. 351 * as many as possible to satisfy the request. The actual number
352 * reserved are returned in outval. 352 * reserved are returned in outval.
353 */ 353 */
354 int 354 int
355 xfs_reserve_blocks( 355 xfs_reserve_blocks(
356 struct xfs_mount *mp, 356 struct xfs_mount *mp,
357 uint64_t request) 357 uint64_t request)
358 { 358 {
359 int64_t lcounter, delt 359 int64_t lcounter, delta;
360 int64_t fdblks_delta = 360 int64_t fdblks_delta = 0;
361 int64_t free; 361 int64_t free;
362 int error = 0; 362 int error = 0;
363 363
364 /* 364 /*
365 * With per-cpu counters, this becomes 365 * With per-cpu counters, this becomes an interesting problem. we need
366 * to work out if we are freeing or al 366 * to work out if we are freeing or allocation blocks first, then we can
367 * do the modification as necessary. 367 * do the modification as necessary.
368 * 368 *
369 * We do this under the m_sb_lock so t 369 * We do this under the m_sb_lock so that if we are near ENOSPC, we will
370 * hold out any changes while we work 370 * hold out any changes while we work out what to do. This means that
371 * the amount of free space can change 371 * the amount of free space can change while we do this, so we need to
372 * retry if we end up trying to reserv 372 * retry if we end up trying to reserve more space than is available.
373 */ 373 */
374 spin_lock(&mp->m_sb_lock); 374 spin_lock(&mp->m_sb_lock);
375 375
376 /* 376 /*
377 * If our previous reservation was lar 377 * If our previous reservation was larger than the current value,
378 * then move any unused blocks back to 378 * then move any unused blocks back to the free pool. Modify the resblks
379 * counters directly since we shouldn' 379 * counters directly since we shouldn't have any problems unreserving
380 * space. 380 * space.
381 */ 381 */
382 if (mp->m_resblks > request) { 382 if (mp->m_resblks > request) {
383 lcounter = mp->m_resblks_avail 383 lcounter = mp->m_resblks_avail - request;
384 if (lcounter > 0) { 384 if (lcounter > 0) { /* release unused blocks */
385 fdblks_delta = lcounte 385 fdblks_delta = lcounter;
386 mp->m_resblks_avail -= 386 mp->m_resblks_avail -= lcounter;
387 } 387 }
388 mp->m_resblks = request; 388 mp->m_resblks = request;
389 if (fdblks_delta) { 389 if (fdblks_delta) {
390 spin_unlock(&mp->m_sb_ 390 spin_unlock(&mp->m_sb_lock);
391 xfs_add_fdblocks(mp, f 391 xfs_add_fdblocks(mp, fdblks_delta);
392 spin_lock(&mp->m_sb_lo 392 spin_lock(&mp->m_sb_lock);
393 } 393 }
394 394
395 goto out; 395 goto out;
396 } 396 }
397 397
398 /* 398 /*
399 * If the request is larger than the c 399 * If the request is larger than the current reservation, reserve the
400 * blocks before we update the reserve 400 * blocks before we update the reserve counters. Sample m_fdblocks and
401 * perform a partial reservation if th 401 * perform a partial reservation if the request exceeds free space.
402 * 402 *
403 * The code below estimates how many b 403 * The code below estimates how many blocks it can request from
404 * fdblocks to stash in the reserve po 404 * fdblocks to stash in the reserve pool. This is a classic TOCTOU
405 * race since fdblocks updates are not 405 * race since fdblocks updates are not always coordinated via
406 * m_sb_lock. Set the reserve size ev 406 * m_sb_lock. Set the reserve size even if there's not enough free
407 * space to fill it because mod_fdbloc 407 * space to fill it because mod_fdblocks will refill an undersized
408 * reserve when it can. 408 * reserve when it can.
409 */ 409 */
410 free = percpu_counter_sum(&mp->m_fdblo 410 free = percpu_counter_sum(&mp->m_fdblocks) -
411 411 xfs_fdblocks_unavailable(mp);
412 delta = request - mp->m_resblks; 412 delta = request - mp->m_resblks;
413 mp->m_resblks = request; 413 mp->m_resblks = request;
414 if (delta > 0 && free > 0) { 414 if (delta > 0 && free > 0) {
415 /* 415 /*
416 * We'll either succeed in get 416 * We'll either succeed in getting space from the free block
417 * count or we'll get an ENOSP 417 * count or we'll get an ENOSPC. Don't set the reserved flag
418 * here - we don't want to res 418 * here - we don't want to reserve the extra reserve blocks
419 * from the reserve. 419 * from the reserve.
420 * 420 *
421 * The desired reserve size ca 421 * The desired reserve size can change after we drop the lock.
422 * Use mod_fdblocks to put the 422 * Use mod_fdblocks to put the space into the reserve or into
423 * fdblocks as appropriate. 423 * fdblocks as appropriate.
424 */ 424 */
425 fdblks_delta = min(free, delta 425 fdblks_delta = min(free, delta);
426 spin_unlock(&mp->m_sb_lock); 426 spin_unlock(&mp->m_sb_lock);
427 error = xfs_dec_fdblocks(mp, f 427 error = xfs_dec_fdblocks(mp, fdblks_delta, 0);
428 if (!error) 428 if (!error)
429 xfs_add_fdblocks(mp, f 429 xfs_add_fdblocks(mp, fdblks_delta);
430 spin_lock(&mp->m_sb_lock); 430 spin_lock(&mp->m_sb_lock);
431 } 431 }
432 out: 432 out:
433 spin_unlock(&mp->m_sb_lock); 433 spin_unlock(&mp->m_sb_lock);
434 return error; 434 return error;
435 } 435 }
436 436
437 int 437 int
438 xfs_fs_goingdown( 438 xfs_fs_goingdown(
439 xfs_mount_t *mp, 439 xfs_mount_t *mp,
440 uint32_t inflags) 440 uint32_t inflags)
441 { 441 {
442 switch (inflags) { 442 switch (inflags) {
443 case XFS_FSOP_GOING_FLAGS_DEFAULT: { 443 case XFS_FSOP_GOING_FLAGS_DEFAULT: {
444 if (!bdev_freeze(mp->m_super-> 444 if (!bdev_freeze(mp->m_super->s_bdev)) {
445 xfs_force_shutdown(mp, 445 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
446 bdev_thaw(mp->m_super- 446 bdev_thaw(mp->m_super->s_bdev);
447 } 447 }
448 break; 448 break;
449 } 449 }
450 case XFS_FSOP_GOING_FLAGS_LOGFLUSH: 450 case XFS_FSOP_GOING_FLAGS_LOGFLUSH:
451 xfs_force_shutdown(mp, SHUTDOW 451 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
452 break; 452 break;
453 case XFS_FSOP_GOING_FLAGS_NOLOGFLUSH: 453 case XFS_FSOP_GOING_FLAGS_NOLOGFLUSH:
454 xfs_force_shutdown(mp, 454 xfs_force_shutdown(mp,
455 SHUTDOWN_FORCE 455 SHUTDOWN_FORCE_UMOUNT | SHUTDOWN_LOG_IO_ERROR);
456 break; 456 break;
457 default: 457 default:
458 return -EINVAL; 458 return -EINVAL;
459 } 459 }
460 460
461 return 0; 461 return 0;
462 } 462 }
463 463
464 /* 464 /*
465 * Force a shutdown of the filesystem instantl 465 * Force a shutdown of the filesystem instantly while keeping the filesystem
466 * consistent. We don't do an unmount here; ju 466 * consistent. We don't do an unmount here; just shutdown the shop, make sure
467 * that absolutely nothing persistent happens 467 * that absolutely nothing persistent happens to this filesystem after this
468 * point. 468 * point.
469 * 469 *
470 * The shutdown state change is atomic, result 470 * The shutdown state change is atomic, resulting in the first and only the
471 * first shutdown call processing the shutdown 471 * first shutdown call processing the shutdown. This means we only shutdown the
472 * log once as it requires, and we don't spam 472 * log once as it requires, and we don't spam the logs when multiple concurrent
473 * shutdowns race to set the shutdown flags. 473 * shutdowns race to set the shutdown flags.
474 */ 474 */
475 void 475 void
476 xfs_do_force_shutdown( 476 xfs_do_force_shutdown(
477 struct xfs_mount *mp, 477 struct xfs_mount *mp,
478 uint32_t flags, 478 uint32_t flags,
479 char *fname, 479 char *fname,
480 int lnnum) 480 int lnnum)
481 { 481 {
482 int tag; 482 int tag;
483 const char *why; 483 const char *why;
484 484
485 485
486 if (xfs_set_shutdown(mp)) { 486 if (xfs_set_shutdown(mp)) {
487 xlog_shutdown_wait(mp->m_log); 487 xlog_shutdown_wait(mp->m_log);
488 return; 488 return;
489 } 489 }
490 if (mp->m_sb_bp) 490 if (mp->m_sb_bp)
491 mp->m_sb_bp->b_flags |= XBF_DO 491 mp->m_sb_bp->b_flags |= XBF_DONE;
492 492
493 if (flags & SHUTDOWN_FORCE_UMOUNT) 493 if (flags & SHUTDOWN_FORCE_UMOUNT)
494 xfs_alert(mp, "User initiated 494 xfs_alert(mp, "User initiated shutdown received.");
495 495
496 if (xlog_force_shutdown(mp->m_log, fla 496 if (xlog_force_shutdown(mp->m_log, flags)) {
497 tag = XFS_PTAG_SHUTDOWN_LOGERR 497 tag = XFS_PTAG_SHUTDOWN_LOGERROR;
498 why = "Log I/O Error"; 498 why = "Log I/O Error";
499 } else if (flags & SHUTDOWN_CORRUPT_IN 499 } else if (flags & SHUTDOWN_CORRUPT_INCORE) {
500 tag = XFS_PTAG_SHUTDOWN_CORRUP 500 tag = XFS_PTAG_SHUTDOWN_CORRUPT;
501 why = "Corruption of in-memory 501 why = "Corruption of in-memory data";
502 } else if (flags & SHUTDOWN_CORRUPT_ON 502 } else if (flags & SHUTDOWN_CORRUPT_ONDISK) {
503 tag = XFS_PTAG_SHUTDOWN_CORRUP 503 tag = XFS_PTAG_SHUTDOWN_CORRUPT;
504 why = "Corruption of on-disk m 504 why = "Corruption of on-disk metadata";
505 } else if (flags & SHUTDOWN_DEVICE_REM 505 } else if (flags & SHUTDOWN_DEVICE_REMOVED) {
506 tag = XFS_PTAG_SHUTDOWN_IOERRO 506 tag = XFS_PTAG_SHUTDOWN_IOERROR;
507 why = "Block device removal"; 507 why = "Block device removal";
508 } else { 508 } else {
509 tag = XFS_PTAG_SHUTDOWN_IOERRO 509 tag = XFS_PTAG_SHUTDOWN_IOERROR;
510 why = "Metadata I/O Error"; 510 why = "Metadata I/O Error";
511 } 511 }
512 512
513 trace_xfs_force_shutdown(mp, tag, flag 513 trace_xfs_force_shutdown(mp, tag, flags, fname, lnnum);
514 514
515 xfs_alert_tag(mp, tag, 515 xfs_alert_tag(mp, tag,
516 "%s (0x%x) detected at %pS (%s:%d). Shutting 516 "%s (0x%x) detected at %pS (%s:%d). Shutting down filesystem.",
517 why, flags, __return_a 517 why, flags, __return_address, fname, lnnum);
518 xfs_alert(mp, 518 xfs_alert(mp,
519 "Please unmount the filesystem 519 "Please unmount the filesystem and rectify the problem(s)");
520 if (xfs_error_level >= XFS_ERRLEVEL_HI 520 if (xfs_error_level >= XFS_ERRLEVEL_HIGH)
521 xfs_stack_trace(); 521 xfs_stack_trace();
522 } 522 }
523 523
524 /* 524 /*
525 * Reserve free space for per-AG metadata. 525 * Reserve free space for per-AG metadata.
526 */ 526 */
527 int 527 int
528 xfs_fs_reserve_ag_blocks( 528 xfs_fs_reserve_ag_blocks(
529 struct xfs_mount *mp) 529 struct xfs_mount *mp)
530 { 530 {
531 xfs_agnumber_t agno; 531 xfs_agnumber_t agno;
532 struct xfs_perag *pag; 532 struct xfs_perag *pag;
533 int error = 0; 533 int error = 0;
534 int err2; 534 int err2;
535 535
536 mp->m_finobt_nores = false; 536 mp->m_finobt_nores = false;
537 for_each_perag(mp, agno, pag) { 537 for_each_perag(mp, agno, pag) {
538 err2 = xfs_ag_resv_init(pag, N 538 err2 = xfs_ag_resv_init(pag, NULL);
539 if (err2 && !error) 539 if (err2 && !error)
540 error = err2; 540 error = err2;
541 } 541 }
542 542
543 if (error && error != -ENOSPC) { 543 if (error && error != -ENOSPC) {
544 xfs_warn(mp, 544 xfs_warn(mp,
545 "Error %d reserving per-AG metadata re 545 "Error %d reserving per-AG metadata reserve pool.", error);
546 xfs_force_shutdown(mp, SHUTDOW 546 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
547 } 547 }
548 548
549 return error; 549 return error;
550 } 550 }
551 551
552 /* 552 /*
553 * Free space reserved for per-AG metadata. 553 * Free space reserved for per-AG metadata.
554 */ 554 */
555 void 555 void
556 xfs_fs_unreserve_ag_blocks( 556 xfs_fs_unreserve_ag_blocks(
557 struct xfs_mount *mp) 557 struct xfs_mount *mp)
558 { 558 {
559 xfs_agnumber_t agno; 559 xfs_agnumber_t agno;
560 struct xfs_perag *pag; 560 struct xfs_perag *pag;
561 561
562 for_each_perag(mp, agno, pag) 562 for_each_perag(mp, agno, pag)
563 xfs_ag_resv_free(pag); 563 xfs_ag_resv_free(pag);
564 } 564 }
565 565
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