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git.proxmox.com Git - mirror_ubuntu-jammy-kernel.git/blob - fs/jfs/resize.c
1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Copyright (C) International Business Machines Corp., 2000-2004
7 #include <linux/buffer_head.h>
8 #include <linux/quotaops.h>
9 #include <linux/blkdev.h>
10 #include "jfs_incore.h"
11 #include "jfs_filsys.h"
12 #include "jfs_metapage.h"
13 #include "jfs_dinode.h"
16 #include "jfs_superblock.h"
17 #include "jfs_txnmgr.h"
18 #include "jfs_debug.h"
20 #define BITSPERPAGE (PSIZE << 3)
22 #define MEGABYTE (1 << L2MEGABYTE)
23 #define MEGABYTE32 (MEGABYTE << 5)
25 /* convert block number to bmap file page number */
26 #define BLKTODMAPN(b)\
27 (((b) >> 13) + ((b) >> 23) + ((b) >> 33) + 3 + 1)
32 * function: extend file system;
34 * |-------------------------------|----------|----------|
35 * file system space fsck inline log
39 * new LVSize: in LV blocks (required)
40 * new LogSize: in LV blocks (optional)
41 * new FSSize: in LV blocks (optional)
44 * 1. set new LogSize as specified or default from new LVSize;
45 * 2. compute new FSCKSize from new LVSize;
46 * 3. set new FSSize as MIN(FSSize, LVSize-(LogSize+FSCKSize)) where
47 * assert(new FSSize >= old FSSize),
48 * i.e., file system must not be shrunk;
50 int jfs_extendfs(struct super_block
*sb
, s64 newLVSize
, int newLogSize
)
53 struct jfs_sb_info
*sbi
= JFS_SBI(sb
);
54 struct inode
*ipbmap
= sbi
->ipbmap
;
55 struct inode
*ipbmap2
;
56 struct inode
*ipimap
= sbi
->ipimap
;
57 struct jfs_log
*log
= sbi
->log
;
58 struct bmap
*bmp
= sbi
->bmap
;
59 s64 newLogAddress
, newFSCKAddress
;
61 s64 newMapSize
= 0, mapSize
;
62 s64 XAddress
, XSize
, nblocks
, xoff
, xaddr
, t64
;
66 int newNpages
= 0, nPages
, newPage
, xlen
, t32
;
68 int log_formatted
= 0;
69 struct inode
*iplist
[1];
70 struct jfs_superblock
*j_sb
, *j_sb2
;
72 int agsizechanged
= 0;
73 struct buffer_head
*bh
, *bh2
;
75 /* If the volume hasn't grown, get out now */
77 if (sbi
->mntflag
& JFS_INLINELOG
)
78 oldLVSize
= addressPXD(&sbi
->logpxd
) + lengthPXD(&sbi
->logpxd
);
80 oldLVSize
= addressPXD(&sbi
->fsckpxd
) +
81 lengthPXD(&sbi
->fsckpxd
);
83 if (oldLVSize
>= newLVSize
) {
85 "jfs_extendfs: volume hasn't grown, returning\n");
89 VolumeSize
= i_size_read(sb
->s_bdev
->bd_inode
) >> sb
->s_blocksize_bits
;
92 if (newLVSize
> VolumeSize
) {
93 printk(KERN_WARNING
"jfs_extendfs: invalid size\n");
98 /* check the device */
99 bh
= sb_bread(sb
, newLVSize
- 1);
101 printk(KERN_WARNING
"jfs_extendfs: invalid size\n");
108 /* Can't extend write-protected drive */
110 if (isReadOnly(ipbmap
)) {
111 printk(KERN_WARNING
"jfs_extendfs: read-only file system\n");
117 * reconfigure LV spaces
118 * ---------------------
120 * validate new size, or, if not specified, determine new size
124 * reconfigure inline log space:
126 if ((sbi
->mntflag
& JFS_INLINELOG
)) {
127 if (newLogSize
== 0) {
129 * no size specified: default to 1/256 of aggregate
130 * size; rounded up to a megabyte boundary;
132 newLogSize
= newLVSize
>> 8;
133 t32
= (1 << (20 - sbi
->l2bsize
)) - 1;
134 newLogSize
= (newLogSize
+ t32
) & ~t32
;
136 min(newLogSize
, MEGABYTE32
>> sbi
->l2bsize
);
139 * convert the newLogSize to fs blocks.
141 * Since this is given in megabytes, it will always be
142 * an even number of pages.
144 newLogSize
= (newLogSize
* MEGABYTE
) >> sbi
->l2bsize
;
150 newLogAddress
= newLVSize
- newLogSize
;
153 * reconfigure fsck work space:
155 * configure it to the end of the logical volume regardless of
156 * whether file system extends to the end of the aggregate;
157 * Need enough 4k pages to cover:
158 * - 1 bit per block in aggregate rounded up to BPERDMAP boundary
159 * - 1 extra page to handle control page and intermediate level pages
160 * - 50 extra pages for the chkdsk service log
162 t64
= ((newLVSize
- newLogSize
+ BPERDMAP
- 1) >> L2BPERDMAP
)
164 t32
= DIV_ROUND_UP(t64
, BITSPERPAGE
) + 1 + 50;
165 newFSCKSize
= t32
<< sbi
->l2nbperpage
;
166 newFSCKAddress
= newLogAddress
- newFSCKSize
;
169 * compute new file system space;
171 newFSSize
= newLVSize
- newLogSize
- newFSCKSize
;
173 /* file system cannot be shrunk */
174 if (newFSSize
< bmp
->db_mapsize
) {
180 * If we're expanding enough that the inline log does not overlap
181 * the old one, we can format the new log before we quiesce the
184 if ((sbi
->mntflag
& JFS_INLINELOG
) && (newLogAddress
> oldLVSize
)) {
185 if ((rc
= lmLogFormat(log
, newLogAddress
, newLogSize
)))
190 * quiesce file system
192 * (prepare to move the inline log and to prevent map update)
194 * block any new transactions and wait for completion of
195 * all wip transactions and flush modified pages s.t.
196 * on-disk file system is in consistent state and
197 * log is not required for recovery.
201 /* Reset size of direct inode */
202 sbi
->direct_inode
->i_size
= i_size_read(sb
->s_bdev
->bd_inode
);
204 if (sbi
->mntflag
& JFS_INLINELOG
) {
206 * deactivate old inline log
211 * mark on-disk super block for fs in transition;
213 * update on-disk superblock for the new space configuration
214 * of inline log space and fsck work space descriptors:
215 * N.B. FS descriptor is NOT updated;
218 * logredo(): if FM_EXTENDFS, return to fsck() for cleanup;
219 * fsck(): if FM_EXTENDFS, reformat inline log and fsck
220 * workspace from superblock inline log descriptor and fsck
221 * workspace descriptor;
224 /* read in superblock */
225 if ((rc
= readSuper(sb
, &bh
)))
227 j_sb
= (struct jfs_superblock
*)bh
->b_data
;
229 /* mark extendfs() in progress */
230 j_sb
->s_state
|= cpu_to_le32(FM_EXTENDFS
);
231 j_sb
->s_xsize
= cpu_to_le64(newFSSize
);
232 PXDaddress(&j_sb
->s_xfsckpxd
, newFSCKAddress
);
233 PXDlength(&j_sb
->s_xfsckpxd
, newFSCKSize
);
234 PXDaddress(&j_sb
->s_xlogpxd
, newLogAddress
);
235 PXDlength(&j_sb
->s_xlogpxd
, newLogSize
);
237 /* synchronously update superblock */
238 mark_buffer_dirty(bh
);
239 sync_dirty_buffer(bh
);
243 * format new inline log synchronously;
245 * crash recovery: if log move in progress,
246 * reformat log and exit success;
249 if ((rc
= lmLogFormat(log
, newLogAddress
, newLogSize
)))
255 log
->base
= newLogAddress
;
256 log
->size
= newLogSize
>> (L2LOGPSIZE
- sb
->s_blocksize_bits
);
257 if ((rc
= lmLogInit(log
)))
262 * extend block allocation map
263 * ---------------------------
265 * extendfs() for new extension, retry after crash recovery;
267 * note: both logredo() and fsck() rebuild map from
268 * the bitmap and configuration parameter from superblock
269 * (disregarding all other control information in the map);
272 * s_size: aggregate size in physical blocks;
275 * compute the new block allocation map configuration
278 * di_size: map file size in byte;
279 * di_nblocks: number of blocks allocated for map file;
280 * di_mapsize: number of blocks in aggregate (covered by map);
282 * db_mapsize: number of blocks in aggregate (covered by map);
284 newMapSize
= newFSSize
;
285 /* number of data pages of new bmap file:
286 * roundup new size to full dmap page boundary and
287 * add 1 extra dmap page for next extendfs()
289 t64
= (newMapSize
- 1) + BPERDMAP
;
290 newNpages
= BLKTODMAPN(t64
) + 1;
293 * extend map from current map (WITHOUT growing mapfile)
295 * map new extension with unmapped part of the last partial
296 * dmap page, if applicable, and extra page(s) allocated
297 * at end of bmap by mkfs() or previous extendfs();
300 /* compute number of blocks requested to extend */
301 mapSize
= bmp
->db_mapsize
;
302 XAddress
= mapSize
; /* eXtension Address */
303 XSize
= newMapSize
- mapSize
; /* eXtension Size */
304 old_agsize
= bmp
->db_agsize
; /* We need to know if this changes */
306 /* compute number of blocks that can be extended by current mapfile */
307 t64
= dbMapFileSizeToMapSize(ipbmap
);
309 printk(KERN_ERR
"jfs_extendfs: mapSize (0x%Lx) > t64 (0x%Lx)\n",
310 (long long) mapSize
, (long long) t64
);
314 nblocks
= min(t64
- mapSize
, XSize
);
317 * update map pages for new extension:
319 * update/init dmap and bubble up the control hierarchy
320 * incrementally fold up dmaps into upper levels;
321 * update bmap control page;
323 if ((rc
= dbExtendFS(ipbmap
, XAddress
, nblocks
)))
326 agsizechanged
|= (bmp
->db_agsize
!= old_agsize
);
329 * the map now has extended to cover additional nblocks:
330 * dn_mapsize = oldMapsize + nblocks;
332 /* ipbmap->i_mapsize += nblocks; */
336 * grow map file to cover remaining extension
337 * and/or one extra dmap page for next extendfs();
339 * allocate new map pages and its backing blocks, and
340 * update map file xtree
342 /* compute number of data pages of current bmap file */
343 nPages
= ipbmap
->i_size
>> L2PSIZE
;
345 /* need to grow map file ? */
346 if (nPages
== newNpages
)
350 * grow bmap file for the new map pages required:
352 * allocate growth at the start of newly extended region;
353 * bmap file only grows sequentially, i.e., both data pages
354 * and possibly xtree index pages may grow in append mode,
355 * s.t. logredo() can reconstruct pre-extension state
356 * by washing away bmap file of pages outside s_size boundary;
359 * journal map file growth as if a regular file growth:
360 * (note: bmap is created with di_mode = IFJOURNAL|IFREG);
362 * journaling of bmap file growth is not required since
363 * logredo() do/can not use log records of bmap file growth
364 * but it provides careful write semantics, pmap update, etc.;
366 /* synchronous write of data pages: bmap data pages are
367 * cached in meta-data cache, and not written out
370 rc
= filemap_fdatawait(ipbmap
->i_mapping
);
374 rc
= filemap_write_and_wait(ipbmap
->i_mapping
);
378 diWriteSpecial(ipbmap
, 0);
380 newPage
= nPages
; /* first new page number */
381 xoff
= newPage
<< sbi
->l2nbperpage
;
382 xlen
= (newNpages
- nPages
) << sbi
->l2nbperpage
;
383 xlen
= min(xlen
, (int) nblocks
) & ~(sbi
->nbperpage
- 1);
386 tid
= txBegin(sb
, COMMIT_FORCE
);
388 if ((rc
= xtAppend(tid
, ipbmap
, 0, xoff
, nblocks
, &xlen
, &xaddr
, 0))) {
392 /* update bmap file size */
393 ipbmap
->i_size
+= xlen
<< sbi
->l2bsize
;
394 inode_add_bytes(ipbmap
, xlen
<< sbi
->l2bsize
);
397 rc
= txCommit(tid
, 1, &iplist
[0], COMMIT_FORCE
);
405 * map file has been grown now to cover extension to further out;
406 * di_size = new map file size;
408 * if huge extension, the previous extension based on previous
409 * map file size may not have been sufficient to cover whole extension
410 * (it could have been used up for new map pages),
411 * but the newly grown map file now covers lot bigger new free space
412 * available for further extension of map;
414 /* any more blocks to extend ? */
420 dbFinalizeBmap(ipbmap
);
423 * update inode allocation map
424 * ---------------------------
426 * move iag lists from old to new iag;
427 * agstart field is not updated for logredo() to reconstruct
428 * iag lists if system crash occurs.
429 * (computation of ag number from agstart based on agsize
430 * will correctly identify the new ag);
432 /* if new AG size the same as old AG size, done! */
434 if ((rc
= diExtendFS(ipimap
, ipbmap
)))
438 if ((rc
= diSync(ipimap
)))
446 * extension is committed when on-disk super block is
447 * updated with new descriptors: logredo will recover
448 * crash before it to pre-extension state;
451 /* sync log to skip log replay of bmap file growth transaction; */
452 /* lmLogSync(log, 1); */
455 * synchronous write bmap global control page;
456 * for crash before completion of write
457 * logredo() will recover to pre-extendfs state;
458 * for crash after completion of write,
459 * logredo() will recover post-extendfs state;
461 if ((rc
= dbSync(ipbmap
)))
465 * copy primary bmap inode to secondary bmap inode
468 ipbmap2
= diReadSpecial(sb
, BMAP_I
, 1);
469 if (ipbmap2
== NULL
) {
470 printk(KERN_ERR
"jfs_extendfs: diReadSpecial(bmap) failed\n");
473 memcpy(&JFS_IP(ipbmap2
)->i_xtroot
, &JFS_IP(ipbmap
)->i_xtroot
, 288);
474 ipbmap2
->i_size
= ipbmap
->i_size
;
475 ipbmap2
->i_blocks
= ipbmap
->i_blocks
;
477 diWriteSpecial(ipbmap2
, 1);
478 diFreeSpecial(ipbmap2
);
483 if ((rc
= readSuper(sb
, &bh
)))
485 j_sb
= (struct jfs_superblock
*)bh
->b_data
;
487 /* mark extendfs() completion */
488 j_sb
->s_state
&= cpu_to_le32(~FM_EXTENDFS
);
489 j_sb
->s_size
= cpu_to_le64(bmp
->db_mapsize
<<
490 le16_to_cpu(j_sb
->s_l2bfactor
));
491 j_sb
->s_agsize
= cpu_to_le32(bmp
->db_agsize
);
493 /* update inline log space descriptor */
494 if (sbi
->mntflag
& JFS_INLINELOG
) {
495 PXDaddress(&(j_sb
->s_logpxd
), newLogAddress
);
496 PXDlength(&(j_sb
->s_logpxd
), newLogSize
);
499 /* record log's mount serial number */
500 j_sb
->s_logserial
= cpu_to_le32(log
->serial
);
502 /* update fsck work space descriptor */
503 PXDaddress(&(j_sb
->s_fsckpxd
), newFSCKAddress
);
504 PXDlength(&(j_sb
->s_fsckpxd
), newFSCKSize
);
506 /* sb->s_fsckloglen remains the same */
508 /* Update secondary superblock */
509 bh2
= sb_bread(sb
, SUPER2_OFF
>> sb
->s_blocksize_bits
);
511 j_sb2
= (struct jfs_superblock
*)bh2
->b_data
;
512 memcpy(j_sb2
, j_sb
, sizeof (struct jfs_superblock
));
514 mark_buffer_dirty(bh
);
515 sync_dirty_buffer(bh2
);
519 /* write primary superblock */
520 mark_buffer_dirty(bh
);
521 sync_dirty_buffer(bh
);
531 * resume file system transactions