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git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blob - fs/jfs/resize.c
2 * Copyright (C) International Business Machines Corp., 2000-2004
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
12 * the GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 #include <linux/buffer_head.h>
21 #include <linux/quotaops.h>
22 #include "jfs_incore.h"
23 #include "jfs_filsys.h"
24 #include "jfs_metapage.h"
25 #include "jfs_dinode.h"
28 #include "jfs_superblock.h"
29 #include "jfs_txnmgr.h"
30 #include "jfs_debug.h"
32 #define BITSPERPAGE (PSIZE << 3)
34 #define MEGABYTE (1 << L2MEGABYTE)
35 #define MEGABYTE32 (MEGABYTE << 5)
37 /* convert block number to bmap file page number */
38 #define BLKTODMAPN(b)\
39 (((b) >> 13) + ((b) >> 23) + ((b) >> 33) + 3 + 1)
44 * function: extend file system;
46 * |-------------------------------|----------|----------|
47 * file system space fsck inline log
51 * new LVSize: in LV blocks (required)
52 * new LogSize: in LV blocks (optional)
53 * new FSSize: in LV blocks (optional)
56 * 1. set new LogSize as specified or default from new LVSize;
57 * 2. compute new FSCKSize from new LVSize;
58 * 3. set new FSSize as MIN(FSSize, LVSize-(LogSize+FSCKSize)) where
59 * assert(new FSSize >= old FSSize),
60 * i.e., file system must not be shrunk;
62 int jfs_extendfs(struct super_block
*sb
, s64 newLVSize
, int newLogSize
)
65 struct jfs_sb_info
*sbi
= JFS_SBI(sb
);
66 struct inode
*ipbmap
= sbi
->ipbmap
;
67 struct inode
*ipbmap2
;
68 struct inode
*ipimap
= sbi
->ipimap
;
69 struct jfs_log
*log
= sbi
->log
;
70 struct bmap
*bmp
= sbi
->bmap
;
71 s64 newLogAddress
, newFSCKAddress
;
73 s64 newMapSize
= 0, mapSize
;
74 s64 XAddress
, XSize
, nblocks
, xoff
, xaddr
, t64
;
78 int newNpages
= 0, nPages
, newPage
, xlen
, t32
;
80 int log_formatted
= 0;
81 struct inode
*iplist
[1];
82 struct jfs_superblock
*j_sb
, *j_sb2
;
84 int agsizechanged
= 0;
85 struct buffer_head
*bh
, *bh2
;
87 /* If the volume hasn't grown, get out now */
89 if (sbi
->mntflag
& JFS_INLINELOG
)
90 oldLVSize
= addressPXD(&sbi
->logpxd
) + lengthPXD(&sbi
->logpxd
);
92 oldLVSize
= addressPXD(&sbi
->fsckpxd
) +
93 lengthPXD(&sbi
->fsckpxd
);
95 if (oldLVSize
>= newLVSize
) {
97 "jfs_extendfs: volume hasn't grown, returning\n");
101 VolumeSize
= sb
->s_bdev
->bd_inode
->i_size
>> sb
->s_blocksize_bits
;
104 if (newLVSize
> VolumeSize
) {
105 printk(KERN_WARNING
"jfs_extendfs: invalid size\n");
110 /* check the device */
111 bh
= sb_bread(sb
, newLVSize
- 1);
113 printk(KERN_WARNING
"jfs_extendfs: invalid size\n");
120 /* Can't extend write-protected drive */
122 if (isReadOnly(ipbmap
)) {
123 printk(KERN_WARNING
"jfs_extendfs: read-only file system\n");
129 * reconfigure LV spaces
130 * ---------------------
132 * validate new size, or, if not specified, determine new size
136 * reconfigure inline log space:
138 if ((sbi
->mntflag
& JFS_INLINELOG
)) {
139 if (newLogSize
== 0) {
141 * no size specified: default to 1/256 of aggregate
142 * size; rounded up to a megabyte boundary;
144 newLogSize
= newLVSize
>> 8;
145 t32
= (1 << (20 - sbi
->l2bsize
)) - 1;
146 newLogSize
= (newLogSize
+ t32
) & ~t32
;
148 min(newLogSize
, MEGABYTE32
>> sbi
->l2bsize
);
151 * convert the newLogSize to fs blocks.
153 * Since this is given in megabytes, it will always be
154 * an even number of pages.
156 newLogSize
= (newLogSize
* MEGABYTE
) >> sbi
->l2bsize
;
162 newLogAddress
= newLVSize
- newLogSize
;
165 * reconfigure fsck work space:
167 * configure it to the end of the logical volume regardless of
168 * whether file system extends to the end of the aggregate;
169 * Need enough 4k pages to cover:
170 * - 1 bit per block in aggregate rounded up to BPERDMAP boundary
171 * - 1 extra page to handle control page and intermediate level pages
172 * - 50 extra pages for the chkdsk service log
174 t64
= ((newLVSize
- newLogSize
+ BPERDMAP
- 1) >> L2BPERDMAP
)
176 t32
= DIV_ROUND_UP(t64
, BITSPERPAGE
) + 1 + 50;
177 newFSCKSize
= t32
<< sbi
->l2nbperpage
;
178 newFSCKAddress
= newLogAddress
- newFSCKSize
;
181 * compute new file system space;
183 newFSSize
= newLVSize
- newLogSize
- newFSCKSize
;
185 /* file system cannot be shrunk */
186 if (newFSSize
< bmp
->db_mapsize
) {
192 * If we're expanding enough that the inline log does not overlap
193 * the old one, we can format the new log before we quiesce the
196 if ((sbi
->mntflag
& JFS_INLINELOG
) && (newLogAddress
> oldLVSize
)) {
197 if ((rc
= lmLogFormat(log
, newLogAddress
, newLogSize
)))
202 * quiesce file system
204 * (prepare to move the inline log and to prevent map update)
206 * block any new transactions and wait for completion of
207 * all wip transactions and flush modified pages s.t.
208 * on-disk file system is in consistent state and
209 * log is not required for recovery.
213 /* Reset size of direct inode */
214 sbi
->direct_inode
->i_size
= sb
->s_bdev
->bd_inode
->i_size
;
216 if (sbi
->mntflag
& JFS_INLINELOG
) {
218 * deactivate old inline log
223 * mark on-disk super block for fs in transition;
225 * update on-disk superblock for the new space configuration
226 * of inline log space and fsck work space descriptors:
227 * N.B. FS descriptor is NOT updated;
230 * logredo(): if FM_EXTENDFS, return to fsck() for cleanup;
231 * fsck(): if FM_EXTENDFS, reformat inline log and fsck
232 * workspace from superblock inline log descriptor and fsck
233 * workspace descriptor;
236 /* read in superblock */
237 if ((rc
= readSuper(sb
, &bh
)))
239 j_sb
= (struct jfs_superblock
*)bh
->b_data
;
241 /* mark extendfs() in progress */
242 j_sb
->s_state
|= cpu_to_le32(FM_EXTENDFS
);
243 j_sb
->s_xsize
= cpu_to_le64(newFSSize
);
244 PXDaddress(&j_sb
->s_xfsckpxd
, newFSCKAddress
);
245 PXDlength(&j_sb
->s_xfsckpxd
, newFSCKSize
);
246 PXDaddress(&j_sb
->s_xlogpxd
, newLogAddress
);
247 PXDlength(&j_sb
->s_xlogpxd
, newLogSize
);
249 /* synchronously update superblock */
250 mark_buffer_dirty(bh
);
251 sync_dirty_buffer(bh
);
255 * format new inline log synchronously;
257 * crash recovery: if log move in progress,
258 * reformat log and exit success;
261 if ((rc
= lmLogFormat(log
, newLogAddress
, newLogSize
)))
267 log
->base
= newLogAddress
;
268 log
->size
= newLogSize
>> (L2LOGPSIZE
- sb
->s_blocksize_bits
);
269 if ((rc
= lmLogInit(log
)))
274 * extend block allocation map
275 * ---------------------------
277 * extendfs() for new extension, retry after crash recovery;
279 * note: both logredo() and fsck() rebuild map from
280 * the bitmap and configuration parameter from superblock
281 * (disregarding all other control information in the map);
284 * s_size: aggregate size in physical blocks;
287 * compute the new block allocation map configuration
290 * di_size: map file size in byte;
291 * di_nblocks: number of blocks allocated for map file;
292 * di_mapsize: number of blocks in aggregate (covered by map);
294 * db_mapsize: number of blocks in aggregate (covered by map);
296 newMapSize
= newFSSize
;
297 /* number of data pages of new bmap file:
298 * roundup new size to full dmap page boundary and
299 * add 1 extra dmap page for next extendfs()
301 t64
= (newMapSize
- 1) + BPERDMAP
;
302 newNpages
= BLKTODMAPN(t64
) + 1;
305 * extend map from current map (WITHOUT growing mapfile)
307 * map new extension with unmapped part of the last partial
308 * dmap page, if applicable, and extra page(s) allocated
309 * at end of bmap by mkfs() or previous extendfs();
312 /* compute number of blocks requested to extend */
313 mapSize
= bmp
->db_mapsize
;
314 XAddress
= mapSize
; /* eXtension Address */
315 XSize
= newMapSize
- mapSize
; /* eXtension Size */
316 old_agsize
= bmp
->db_agsize
; /* We need to know if this changes */
318 /* compute number of blocks that can be extended by current mapfile */
319 t64
= dbMapFileSizeToMapSize(ipbmap
);
321 printk(KERN_ERR
"jfs_extendfs: mapSize (0x%Lx) > t64 (0x%Lx)\n",
322 (long long) mapSize
, (long long) t64
);
326 nblocks
= min(t64
- mapSize
, XSize
);
329 * update map pages for new extension:
331 * update/init dmap and bubble up the control hierarchy
332 * incrementally fold up dmaps into upper levels;
333 * update bmap control page;
335 if ((rc
= dbExtendFS(ipbmap
, XAddress
, nblocks
)))
338 agsizechanged
|= (bmp
->db_agsize
!= old_agsize
);
341 * the map now has extended to cover additional nblocks:
342 * dn_mapsize = oldMapsize + nblocks;
344 /* ipbmap->i_mapsize += nblocks; */
348 * grow map file to cover remaining extension
349 * and/or one extra dmap page for next extendfs();
351 * allocate new map pages and its backing blocks, and
352 * update map file xtree
354 /* compute number of data pages of current bmap file */
355 nPages
= ipbmap
->i_size
>> L2PSIZE
;
357 /* need to grow map file ? */
358 if (nPages
== newNpages
)
362 * grow bmap file for the new map pages required:
364 * allocate growth at the start of newly extended region;
365 * bmap file only grows sequentially, i.e., both data pages
366 * and possibly xtree index pages may grow in append mode,
367 * s.t. logredo() can reconstruct pre-extension state
368 * by washing away bmap file of pages outside s_size boundary;
371 * journal map file growth as if a regular file growth:
372 * (note: bmap is created with di_mode = IFJOURNAL|IFREG);
374 * journaling of bmap file growth is not required since
375 * logredo() do/can not use log records of bmap file growth
376 * but it provides careful write semantics, pmap update, etc.;
378 /* synchronous write of data pages: bmap data pages are
379 * cached in meta-data cache, and not written out
382 filemap_fdatawait(ipbmap
->i_mapping
);
383 filemap_write_and_wait(ipbmap
->i_mapping
);
384 diWriteSpecial(ipbmap
, 0);
386 newPage
= nPages
; /* first new page number */
387 xoff
= newPage
<< sbi
->l2nbperpage
;
388 xlen
= (newNpages
- nPages
) << sbi
->l2nbperpage
;
389 xlen
= min(xlen
, (int) nblocks
) & ~(sbi
->nbperpage
- 1);
392 tid
= txBegin(sb
, COMMIT_FORCE
);
394 if ((rc
= xtAppend(tid
, ipbmap
, 0, xoff
, nblocks
, &xlen
, &xaddr
, 0))) {
398 /* update bmap file size */
399 ipbmap
->i_size
+= xlen
<< sbi
->l2bsize
;
400 inode_add_bytes(ipbmap
, xlen
<< sbi
->l2bsize
);
403 rc
= txCommit(tid
, 1, &iplist
[0], COMMIT_FORCE
);
411 * map file has been grown now to cover extension to further out;
412 * di_size = new map file size;
414 * if huge extension, the previous extension based on previous
415 * map file size may not have been sufficient to cover whole extension
416 * (it could have been used up for new map pages),
417 * but the newly grown map file now covers lot bigger new free space
418 * available for further extension of map;
420 /* any more blocks to extend ? */
426 dbFinalizeBmap(ipbmap
);
429 * update inode allocation map
430 * ---------------------------
432 * move iag lists from old to new iag;
433 * agstart field is not updated for logredo() to reconstruct
434 * iag lists if system crash occurs.
435 * (computation of ag number from agstart based on agsize
436 * will correctly identify the new ag);
438 /* if new AG size the same as old AG size, done! */
440 if ((rc
= diExtendFS(ipimap
, ipbmap
)))
444 if ((rc
= diSync(ipimap
)))
452 * extension is committed when on-disk super block is
453 * updated with new descriptors: logredo will recover
454 * crash before it to pre-extension state;
457 /* sync log to skip log replay of bmap file growth transaction; */
458 /* lmLogSync(log, 1); */
461 * synchronous write bmap global control page;
462 * for crash before completion of write
463 * logredo() will recover to pre-extendfs state;
464 * for crash after completion of write,
465 * logredo() will recover post-extendfs state;
467 if ((rc
= dbSync(ipbmap
)))
471 * copy primary bmap inode to secondary bmap inode
474 ipbmap2
= diReadSpecial(sb
, BMAP_I
, 1);
475 if (ipbmap2
== NULL
) {
476 printk(KERN_ERR
"jfs_extendfs: diReadSpecial(bmap) failed\n");
479 memcpy(&JFS_IP(ipbmap2
)->i_xtroot
, &JFS_IP(ipbmap
)->i_xtroot
, 288);
480 ipbmap2
->i_size
= ipbmap
->i_size
;
481 ipbmap2
->i_blocks
= ipbmap
->i_blocks
;
483 diWriteSpecial(ipbmap2
, 1);
484 diFreeSpecial(ipbmap2
);
489 if ((rc
= readSuper(sb
, &bh
)))
491 j_sb
= (struct jfs_superblock
*)bh
->b_data
;
493 /* mark extendfs() completion */
494 j_sb
->s_state
&= cpu_to_le32(~FM_EXTENDFS
);
495 j_sb
->s_size
= cpu_to_le64(bmp
->db_mapsize
<<
496 le16_to_cpu(j_sb
->s_l2bfactor
));
497 j_sb
->s_agsize
= cpu_to_le32(bmp
->db_agsize
);
499 /* update inline log space descriptor */
500 if (sbi
->mntflag
& JFS_INLINELOG
) {
501 PXDaddress(&(j_sb
->s_logpxd
), newLogAddress
);
502 PXDlength(&(j_sb
->s_logpxd
), newLogSize
);
505 /* record log's mount serial number */
506 j_sb
->s_logserial
= cpu_to_le32(log
->serial
);
508 /* update fsck work space descriptor */
509 PXDaddress(&(j_sb
->s_fsckpxd
), newFSCKAddress
);
510 PXDlength(&(j_sb
->s_fsckpxd
), newFSCKSize
);
512 /* sb->s_fsckloglen remains the same */
514 /* Update secondary superblock */
515 bh2
= sb_bread(sb
, SUPER2_OFF
>> sb
->s_blocksize_bits
);
517 j_sb2
= (struct jfs_superblock
*)bh2
->b_data
;
518 memcpy(j_sb2
, j_sb
, sizeof (struct jfs_superblock
));
520 mark_buffer_dirty(bh
);
521 sync_dirty_buffer(bh2
);
525 /* write primary superblock */
526 mark_buffer_dirty(bh
);
527 sync_dirty_buffer(bh
);
533 jfs_error(sb
, "jfs_extendfs");
537 * resume file system transactions