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git.ipfire.org Git - people/ms/linux.git/blob - fs/jfs/jfs_mount.c
1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Copyright (C) International Business Machines Corp., 2000-2004
9 * note: file system in transition to aggregate/fileset:
11 * file system mount is interpreted as the mount of aggregate,
12 * if not already mounted, and mount of the single/only fileset in
15 * a file system/aggregate is represented by an internal inode
16 * (aka mount inode) initialized with aggregate superblock;
17 * each vfs represents a fileset, and points to its "fileset inode
18 * allocation map inode" (aka fileset inode):
19 * (an aggregate itself is structured recursively as a filset:
20 * an internal vfs is constructed and points to its "fileset inode
21 * allocation map inode" (aka aggregate inode) where each inode
22 * represents a fileset inode) so that inode number is mapped to
23 * on-disk inode in uniform way at both aggregate and fileset level;
25 * each vnode/inode of a fileset is linked to its vfs (to facilitate
26 * per fileset inode operations, e.g., unmount of a fileset, etc.);
27 * each inode points to the mount inode (to facilitate access to
28 * per aggregate information, e.g., block size, etc.) as well as
33 * mntvfs -> fileset ipimap+ -> aggregate ipbmap -> aggregate ipaimap;
34 * fileset vfs -> vp(1) <-> ... <-> vp(n) <->vproot;
38 #include <linux/buffer_head.h>
39 #include <linux/blkdev.h>
40 #include <linux/log2.h>
42 #include "jfs_incore.h"
43 #include "jfs_filsys.h"
44 #include "jfs_superblock.h"
47 #include "jfs_metapage.h"
48 #include "jfs_debug.h"
54 static int chkSuper(struct super_block
*);
55 static int logMOUNT(struct super_block
*sb
);
60 * FUNCTION: vfs_mount()
62 * PARAMETER: sb - super block
64 * RETURN: -EBUSY - device already mounted or open for write
65 * -EBUSY - cvrdvp already mounted;
66 * -EBUSY - mount table full
67 * -ENOTDIR- cvrdvp not directory on a device mount
68 * -ENXIO - device open failure
70 int jfs_mount(struct super_block
*sb
)
72 int rc
= 0; /* Return code */
73 struct jfs_sb_info
*sbi
= JFS_SBI(sb
);
74 struct inode
*ipaimap
= NULL
;
75 struct inode
*ipaimap2
= NULL
;
76 struct inode
*ipimap
= NULL
;
77 struct inode
*ipbmap
= NULL
;
80 * read/validate superblock
81 * (initialize mount inode from the superblock)
83 if ((rc
= chkSuper(sb
))) {
87 ipaimap
= diReadSpecial(sb
, AGGREGATE_I
, 0);
88 if (ipaimap
== NULL
) {
89 jfs_err("jfs_mount: Failed to read AGGREGATE_I");
93 sbi
->ipaimap
= ipaimap
;
95 jfs_info("jfs_mount: ipaimap:0x%p", ipaimap
);
98 * initialize aggregate inode allocation map
100 if ((rc
= diMount(ipaimap
))) {
101 jfs_err("jfs_mount: diMount(ipaimap) failed w/rc = %d", rc
);
106 * open aggregate block allocation map
108 ipbmap
= diReadSpecial(sb
, BMAP_I
, 0);
109 if (ipbmap
== NULL
) {
111 goto err_umount_ipaimap
;
114 jfs_info("jfs_mount: ipbmap:0x%p", ipbmap
);
116 sbi
->ipbmap
= ipbmap
;
119 * initialize aggregate block allocation map
121 if ((rc
= dbMount(ipbmap
))) {
122 jfs_err("jfs_mount: dbMount failed w/rc = %d", rc
);
127 * open the secondary aggregate inode allocation map
129 * This is a duplicate of the aggregate inode allocation map.
131 * hand craft a vfs in the same fashion as we did to read ipaimap.
132 * By adding INOSPEREXT (32) to the inode number, we are telling
133 * diReadSpecial that we are reading from the secondary aggregate
134 * inode table. This also creates a unique entry in the inode hash
137 if ((sbi
->mntflag
& JFS_BAD_SAIT
) == 0) {
138 ipaimap2
= diReadSpecial(sb
, AGGREGATE_I
, 1);
140 jfs_err("jfs_mount: Failed to read AGGREGATE_I");
142 goto err_umount_ipbmap
;
144 sbi
->ipaimap2
= ipaimap2
;
146 jfs_info("jfs_mount: ipaimap2:0x%p", ipaimap2
);
149 * initialize secondary aggregate inode allocation map
151 if ((rc
= diMount(ipaimap2
))) {
152 jfs_err("jfs_mount: diMount(ipaimap2) failed, rc = %d",
157 /* Secondary aggregate inode table is not valid */
158 sbi
->ipaimap2
= NULL
;
161 * mount (the only/single) fileset
164 * open fileset inode allocation map (aka fileset inode)
166 ipimap
= diReadSpecial(sb
, FILESYSTEM_I
, 0);
167 if (ipimap
== NULL
) {
168 jfs_err("jfs_mount: Failed to read FILESYSTEM_I");
169 /* open fileset secondary inode allocation map */
171 goto err_umount_ipaimap2
;
173 jfs_info("jfs_mount: ipimap:0x%p", ipimap
);
175 /* map further access of per fileset inodes by the fileset inode */
176 sbi
->ipimap
= ipimap
;
178 /* initialize fileset inode allocation map */
179 if ((rc
= diMount(ipimap
))) {
180 jfs_err("jfs_mount: diMount failed w/rc = %d", rc
);
190 /* close fileset inode allocation map inode */
191 diFreeSpecial(ipimap
);
193 /* close secondary aggregate inode allocation map */
195 diUnmount(ipaimap2
, 1);
197 /* close aggregate inodes */
199 diFreeSpecial(ipaimap2
);
200 err_umount_ipbmap
: /* close aggregate block allocation map */
201 dbUnmount(ipbmap
, 1);
202 err_ipbmap
: /* close aggregate inodes */
203 diFreeSpecial(ipbmap
);
204 err_umount_ipaimap
: /* close aggregate inode allocation map */
205 diUnmount(ipaimap
, 1);
206 err_ipaimap
: /* close aggregate inodes */
207 diFreeSpecial(ipaimap
);
210 jfs_err("Mount JFS Failure: %d", rc
);
216 * NAME: jfs_mount_rw(sb, remount)
218 * FUNCTION: Completes read-write mount, or remounts read-only volume
221 int jfs_mount_rw(struct super_block
*sb
, int remount
)
223 struct jfs_sb_info
*sbi
= JFS_SBI(sb
);
227 * If we are re-mounting a previously read-only volume, we want to
228 * re-read the inode and block maps, since fsck.jfs may have updated
232 if (chkSuper(sb
) || (sbi
->state
!= FM_CLEAN
))
235 truncate_inode_pages(sbi
->ipimap
->i_mapping
, 0);
236 truncate_inode_pages(sbi
->ipbmap
->i_mapping
, 0);
237 diUnmount(sbi
->ipimap
, 1);
238 if ((rc
= diMount(sbi
->ipimap
))) {
239 jfs_err("jfs_mount_rw: diMount failed!");
243 dbUnmount(sbi
->ipbmap
, 1);
244 if ((rc
= dbMount(sbi
->ipbmap
))) {
245 jfs_err("jfs_mount_rw: dbMount failed!");
251 * open/initialize log
253 if ((rc
= lmLogOpen(sb
)))
257 * update file system superblock;
259 if ((rc
= updateSuper(sb
, FM_MOUNT
))) {
260 jfs_err("jfs_mount: updateSuper failed w/rc = %d", rc
);
266 * write MOUNT log record of the file system
276 * validate the superblock of the file system to be mounted and
277 * get the file system parameters.
280 * 0 with fragsize set if check successful
281 * error code if not successful
283 static int chkSuper(struct super_block
*sb
)
286 struct jfs_sb_info
*sbi
= JFS_SBI(sb
);
287 struct jfs_superblock
*j_sb
;
288 struct buffer_head
*bh
;
289 int AIM_bytesize
, AIT_bytesize
;
290 int expected_AIM_bytesize
, expected_AIT_bytesize
;
291 s64 AIM_byte_addr
, AIT_byte_addr
, fsckwsp_addr
;
292 s64 byte_addr_diff0
, byte_addr_diff1
;
295 if ((rc
= readSuper(sb
, &bh
)))
297 j_sb
= (struct jfs_superblock
*)bh
->b_data
;
300 * validate superblock
302 /* validate fs signature */
303 if (strncmp(j_sb
->s_magic
, JFS_MAGIC
, 4) ||
304 le32_to_cpu(j_sb
->s_version
) > JFS_VERSION
) {
309 bsize
= le32_to_cpu(j_sb
->s_bsize
);
310 if (bsize
!= PSIZE
) {
311 jfs_err("Only 4K block size supported!");
316 jfs_info("superblock: flag:0x%08x state:0x%08x size:0x%Lx",
317 le32_to_cpu(j_sb
->s_flag
), le32_to_cpu(j_sb
->s_state
),
318 (unsigned long long) le64_to_cpu(j_sb
->s_size
));
320 /* validate the descriptors for Secondary AIM and AIT */
321 if ((j_sb
->s_flag
& cpu_to_le32(JFS_BAD_SAIT
)) !=
322 cpu_to_le32(JFS_BAD_SAIT
)) {
323 expected_AIM_bytesize
= 2 * PSIZE
;
324 AIM_bytesize
= lengthPXD(&(j_sb
->s_aim2
)) * bsize
;
325 expected_AIT_bytesize
= 4 * PSIZE
;
326 AIT_bytesize
= lengthPXD(&(j_sb
->s_ait2
)) * bsize
;
327 AIM_byte_addr
= addressPXD(&(j_sb
->s_aim2
)) * bsize
;
328 AIT_byte_addr
= addressPXD(&(j_sb
->s_ait2
)) * bsize
;
329 byte_addr_diff0
= AIT_byte_addr
- AIM_byte_addr
;
330 fsckwsp_addr
= addressPXD(&(j_sb
->s_fsckpxd
)) * bsize
;
331 byte_addr_diff1
= fsckwsp_addr
- AIT_byte_addr
;
332 if ((AIM_bytesize
!= expected_AIM_bytesize
) ||
333 (AIT_bytesize
!= expected_AIT_bytesize
) ||
334 (byte_addr_diff0
!= AIM_bytesize
) ||
335 (byte_addr_diff1
<= AIT_bytesize
))
336 j_sb
->s_flag
|= cpu_to_le32(JFS_BAD_SAIT
);
339 if ((j_sb
->s_flag
& cpu_to_le32(JFS_GROUPCOMMIT
)) !=
340 cpu_to_le32(JFS_GROUPCOMMIT
))
341 j_sb
->s_flag
|= cpu_to_le32(JFS_GROUPCOMMIT
);
343 /* validate fs state */
344 if (j_sb
->s_state
!= cpu_to_le32(FM_CLEAN
) &&
346 jfs_err("jfs_mount: Mount Failure: File System Dirty.");
351 sbi
->state
= le32_to_cpu(j_sb
->s_state
);
352 sbi
->mntflag
= le32_to_cpu(j_sb
->s_flag
);
355 * JFS always does I/O by 4K pages. Don't tell the buffer cache
356 * that we use anything else (leave s_blocksize alone).
359 sbi
->l2bsize
= le16_to_cpu(j_sb
->s_l2bsize
);
361 /* check some fields for possible corruption */
362 if (sbi
->l2bsize
!= ilog2((u32
)bsize
) ||
364 le32_to_cpu(j_sb
->s_state
) > FM_STATE_MAX
) {
366 jfs_err("jfs_mount: Mount Failure: superblock is corrupt!");
371 * For now, ignore s_pbsize, l2bfactor. All I/O going through buffer
374 sbi
->nbperpage
= PSIZE
>> sbi
->l2bsize
;
375 sbi
->l2nbperpage
= L2PSIZE
- sbi
->l2bsize
;
376 sbi
->l2niperblk
= sbi
->l2bsize
- L2DISIZE
;
377 if (sbi
->mntflag
& JFS_INLINELOG
)
378 sbi
->logpxd
= j_sb
->s_logpxd
;
380 sbi
->logdev
= new_decode_dev(le32_to_cpu(j_sb
->s_logdev
));
381 uuid_copy(&sbi
->uuid
, &j_sb
->s_uuid
);
382 uuid_copy(&sbi
->loguuid
, &j_sb
->s_loguuid
);
384 sbi
->fsckpxd
= j_sb
->s_fsckpxd
;
385 sbi
->ait2
= j_sb
->s_ait2
;
396 * update synchronously superblock if it is mounted read-write.
398 int updateSuper(struct super_block
*sb
, uint state
)
400 struct jfs_superblock
*j_sb
;
401 struct jfs_sb_info
*sbi
= JFS_SBI(sb
);
402 struct buffer_head
*bh
;
405 if (sbi
->flag
& JFS_NOINTEGRITY
) {
406 if (state
== FM_DIRTY
) {
407 sbi
->p_state
= state
;
409 } else if (state
== FM_MOUNT
) {
410 sbi
->p_state
= sbi
->state
;
412 } else if (state
== FM_CLEAN
) {
413 state
= sbi
->p_state
;
415 jfs_err("updateSuper: bad state");
416 } else if (sbi
->state
== FM_DIRTY
)
419 if ((rc
= readSuper(sb
, &bh
)))
422 j_sb
= (struct jfs_superblock
*)bh
->b_data
;
424 j_sb
->s_state
= cpu_to_le32(state
);
427 if (state
== FM_MOUNT
) {
428 /* record log's dev_t and mount serial number */
429 j_sb
->s_logdev
= cpu_to_le32(new_encode_dev(sbi
->log
->bdev
->bd_dev
));
430 j_sb
->s_logserial
= cpu_to_le32(sbi
->log
->serial
);
431 } else if (state
== FM_CLEAN
) {
433 * If this volume is shared with OS/2, OS/2 will need to
434 * recalculate DASD usage, since we don't deal with it.
436 if (j_sb
->s_flag
& cpu_to_le32(JFS_DASD_ENABLED
))
437 j_sb
->s_flag
|= cpu_to_le32(JFS_DASD_PRIME
);
440 mark_buffer_dirty(bh
);
441 sync_dirty_buffer(bh
);
451 * read superblock by raw sector address
453 int readSuper(struct super_block
*sb
, struct buffer_head
**bpp
)
455 /* read in primary superblock */
456 *bpp
= sb_bread(sb
, SUPER1_OFF
>> sb
->s_blocksize_bits
);
460 /* read in secondary/replicated superblock */
461 *bpp
= sb_bread(sb
, SUPER2_OFF
>> sb
->s_blocksize_bits
);
472 * function: write a MOUNT log record for file system.
474 * MOUNT record keeps logredo() from processing log records
475 * for this file system past this point in log.
476 * it is harmless if mount fails.
478 * note: MOUNT record is at aggregate level, not at fileset level,
479 * since log records of previous mounts of a fileset
480 * (e.g., AFTER record of extent allocation) have to be processed
481 * to update block allocation map at aggregate level.
483 static int logMOUNT(struct super_block
*sb
)
485 struct jfs_log
*log
= JFS_SBI(sb
)->log
;
490 lrd
.type
= cpu_to_le16(LOG_MOUNT
);
492 lrd
.aggregate
= cpu_to_le32(new_encode_dev(sb
->s_bdev
->bd_dev
));
493 lmLog(log
, NULL
, &lrd
, NULL
);