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-rw-r--r--fs/jfs/jfs_mount.c496
1 files changed, 496 insertions, 0 deletions
diff --git a/fs/jfs/jfs_mount.c b/fs/jfs/jfs_mount.c
new file mode 100644
index 000000000..48d1f70f7
--- /dev/null
+++ b/fs/jfs/jfs_mount.c
@@ -0,0 +1,496 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) International Business Machines Corp., 2000-2004
+ */
+
+/*
+ * Module: jfs_mount.c
+ *
+ * note: file system in transition to aggregate/fileset:
+ *
+ * file system mount is interpreted as the mount of aggregate,
+ * if not already mounted, and mount of the single/only fileset in
+ * the aggregate;
+ *
+ * a file system/aggregate is represented by an internal inode
+ * (aka mount inode) initialized with aggregate superblock;
+ * each vfs represents a fileset, and points to its "fileset inode
+ * allocation map inode" (aka fileset inode):
+ * (an aggregate itself is structured recursively as a filset:
+ * an internal vfs is constructed and points to its "fileset inode
+ * allocation map inode" (aka aggregate inode) where each inode
+ * represents a fileset inode) so that inode number is mapped to
+ * on-disk inode in uniform way at both aggregate and fileset level;
+ *
+ * each vnode/inode of a fileset is linked to its vfs (to facilitate
+ * per fileset inode operations, e.g., unmount of a fileset, etc.);
+ * each inode points to the mount inode (to facilitate access to
+ * per aggregate information, e.g., block size, etc.) as well as
+ * its file set inode.
+ *
+ * aggregate
+ * ipmnt
+ * mntvfs -> fileset ipimap+ -> aggregate ipbmap -> aggregate ipaimap;
+ * fileset vfs -> vp(1) <-> ... <-> vp(n) <->vproot;
+ */
+
+#include <linux/fs.h>
+#include <linux/buffer_head.h>
+#include <linux/blkdev.h>
+#include <linux/log2.h>
+
+#include "jfs_incore.h"
+#include "jfs_filsys.h"
+#include "jfs_superblock.h"
+#include "jfs_dmap.h"
+#include "jfs_imap.h"
+#include "jfs_metapage.h"
+#include "jfs_debug.h"
+
+
+/*
+ * forward references
+ */
+static int chkSuper(struct super_block *);
+static int logMOUNT(struct super_block *sb);
+
+/*
+ * NAME: jfs_mount(sb)
+ *
+ * FUNCTION: vfs_mount()
+ *
+ * PARAMETER: sb - super block
+ *
+ * RETURN: -EBUSY - device already mounted or open for write
+ * -EBUSY - cvrdvp already mounted;
+ * -EBUSY - mount table full
+ * -ENOTDIR- cvrdvp not directory on a device mount
+ * -ENXIO - device open failure
+ */
+int jfs_mount(struct super_block *sb)
+{
+ int rc = 0; /* Return code */
+ struct jfs_sb_info *sbi = JFS_SBI(sb);
+ struct inode *ipaimap = NULL;
+ struct inode *ipaimap2 = NULL;
+ struct inode *ipimap = NULL;
+ struct inode *ipbmap = NULL;
+
+ /*
+ * read/validate superblock
+ * (initialize mount inode from the superblock)
+ */
+ if ((rc = chkSuper(sb))) {
+ goto out;
+ }
+
+ ipaimap = diReadSpecial(sb, AGGREGATE_I, 0);
+ if (ipaimap == NULL) {
+ jfs_err("jfs_mount: Failed to read AGGREGATE_I");
+ rc = -EIO;
+ goto out;
+ }
+ sbi->ipaimap = ipaimap;
+
+ jfs_info("jfs_mount: ipaimap:0x%p", ipaimap);
+
+ /*
+ * initialize aggregate inode allocation map
+ */
+ if ((rc = diMount(ipaimap))) {
+ jfs_err("jfs_mount: diMount(ipaimap) failed w/rc = %d", rc);
+ goto err_ipaimap;
+ }
+
+ /*
+ * open aggregate block allocation map
+ */
+ ipbmap = diReadSpecial(sb, BMAP_I, 0);
+ if (ipbmap == NULL) {
+ rc = -EIO;
+ goto err_umount_ipaimap;
+ }
+
+ jfs_info("jfs_mount: ipbmap:0x%p", ipbmap);
+
+ sbi->ipbmap = ipbmap;
+
+ /*
+ * initialize aggregate block allocation map
+ */
+ if ((rc = dbMount(ipbmap))) {
+ jfs_err("jfs_mount: dbMount failed w/rc = %d", rc);
+ goto err_ipbmap;
+ }
+
+ /*
+ * open the secondary aggregate inode allocation map
+ *
+ * This is a duplicate of the aggregate inode allocation map.
+ *
+ * hand craft a vfs in the same fashion as we did to read ipaimap.
+ * By adding INOSPEREXT (32) to the inode number, we are telling
+ * diReadSpecial that we are reading from the secondary aggregate
+ * inode table. This also creates a unique entry in the inode hash
+ * table.
+ */
+ if ((sbi->mntflag & JFS_BAD_SAIT) == 0) {
+ ipaimap2 = diReadSpecial(sb, AGGREGATE_I, 1);
+ if (!ipaimap2) {
+ jfs_err("jfs_mount: Failed to read AGGREGATE_I");
+ rc = -EIO;
+ goto err_umount_ipbmap;
+ }
+ sbi->ipaimap2 = ipaimap2;
+
+ jfs_info("jfs_mount: ipaimap2:0x%p", ipaimap2);
+
+ /*
+ * initialize secondary aggregate inode allocation map
+ */
+ if ((rc = diMount(ipaimap2))) {
+ jfs_err("jfs_mount: diMount(ipaimap2) failed, rc = %d",
+ rc);
+ goto err_ipaimap2;
+ }
+ } else
+ /* Secondary aggregate inode table is not valid */
+ sbi->ipaimap2 = NULL;
+
+ /*
+ * mount (the only/single) fileset
+ */
+ /*
+ * open fileset inode allocation map (aka fileset inode)
+ */
+ ipimap = diReadSpecial(sb, FILESYSTEM_I, 0);
+ if (ipimap == NULL) {
+ jfs_err("jfs_mount: Failed to read FILESYSTEM_I");
+ /* open fileset secondary inode allocation map */
+ rc = -EIO;
+ goto err_umount_ipaimap2;
+ }
+ jfs_info("jfs_mount: ipimap:0x%p", ipimap);
+
+ /* map further access of per fileset inodes by the fileset inode */
+ sbi->ipimap = ipimap;
+
+ /* initialize fileset inode allocation map */
+ if ((rc = diMount(ipimap))) {
+ jfs_err("jfs_mount: diMount failed w/rc = %d", rc);
+ goto err_ipimap;
+ }
+
+ return rc;
+
+ /*
+ * unwind on error
+ */
+err_ipimap:
+ /* close fileset inode allocation map inode */
+ diFreeSpecial(ipimap);
+err_umount_ipaimap2:
+ /* close secondary aggregate inode allocation map */
+ if (ipaimap2)
+ diUnmount(ipaimap2, 1);
+err_ipaimap2:
+ /* close aggregate inodes */
+ if (ipaimap2)
+ diFreeSpecial(ipaimap2);
+err_umount_ipbmap: /* close aggregate block allocation map */
+ dbUnmount(ipbmap, 1);
+err_ipbmap: /* close aggregate inodes */
+ diFreeSpecial(ipbmap);
+err_umount_ipaimap: /* close aggregate inode allocation map */
+ diUnmount(ipaimap, 1);
+err_ipaimap: /* close aggregate inodes */
+ diFreeSpecial(ipaimap);
+out:
+ if (rc)
+ jfs_err("Mount JFS Failure: %d", rc);
+
+ return rc;
+}
+
+/*
+ * NAME: jfs_mount_rw(sb, remount)
+ *
+ * FUNCTION: Completes read-write mount, or remounts read-only volume
+ * as read-write
+ */
+int jfs_mount_rw(struct super_block *sb, int remount)
+{
+ struct jfs_sb_info *sbi = JFS_SBI(sb);
+ int rc;
+
+ /*
+ * If we are re-mounting a previously read-only volume, we want to
+ * re-read the inode and block maps, since fsck.jfs may have updated
+ * them.
+ */
+ if (remount) {
+ if (chkSuper(sb) || (sbi->state != FM_CLEAN))
+ return -EINVAL;
+
+ truncate_inode_pages(sbi->ipimap->i_mapping, 0);
+ truncate_inode_pages(sbi->ipbmap->i_mapping, 0);
+ diUnmount(sbi->ipimap, 1);
+ if ((rc = diMount(sbi->ipimap))) {
+ jfs_err("jfs_mount_rw: diMount failed!");
+ return rc;
+ }
+
+ dbUnmount(sbi->ipbmap, 1);
+ if ((rc = dbMount(sbi->ipbmap))) {
+ jfs_err("jfs_mount_rw: dbMount failed!");
+ return rc;
+ }
+ }
+
+ /*
+ * open/initialize log
+ */
+ if ((rc = lmLogOpen(sb)))
+ return rc;
+
+ /*
+ * update file system superblock;
+ */
+ if ((rc = updateSuper(sb, FM_MOUNT))) {
+ jfs_err("jfs_mount: updateSuper failed w/rc = %d", rc);
+ lmLogClose(sb);
+ return rc;
+ }
+
+ /*
+ * write MOUNT log record of the file system
+ */
+ logMOUNT(sb);
+
+ return rc;
+}
+
+/*
+ * chkSuper()
+ *
+ * validate the superblock of the file system to be mounted and
+ * get the file system parameters.
+ *
+ * returns
+ * 0 with fragsize set if check successful
+ * error code if not successful
+ */
+static int chkSuper(struct super_block *sb)
+{
+ int rc = 0;
+ struct jfs_sb_info *sbi = JFS_SBI(sb);
+ struct jfs_superblock *j_sb;
+ struct buffer_head *bh;
+ int AIM_bytesize, AIT_bytesize;
+ int expected_AIM_bytesize, expected_AIT_bytesize;
+ s64 AIM_byte_addr, AIT_byte_addr, fsckwsp_addr;
+ s64 byte_addr_diff0, byte_addr_diff1;
+ s32 bsize;
+
+ if ((rc = readSuper(sb, &bh)))
+ return rc;
+ j_sb = (struct jfs_superblock *)bh->b_data;
+
+ /*
+ * validate superblock
+ */
+ /* validate fs signature */
+ if (strncmp(j_sb->s_magic, JFS_MAGIC, 4) ||
+ le32_to_cpu(j_sb->s_version) > JFS_VERSION) {
+ rc = -EINVAL;
+ goto out;
+ }
+
+ bsize = le32_to_cpu(j_sb->s_bsize);
+ if (bsize != PSIZE) {
+ jfs_err("Only 4K block size supported!");
+ rc = -EINVAL;
+ goto out;
+ }
+
+ jfs_info("superblock: flag:0x%08x state:0x%08x size:0x%Lx",
+ le32_to_cpu(j_sb->s_flag), le32_to_cpu(j_sb->s_state),
+ (unsigned long long) le64_to_cpu(j_sb->s_size));
+
+ /* validate the descriptors for Secondary AIM and AIT */
+ if ((j_sb->s_flag & cpu_to_le32(JFS_BAD_SAIT)) !=
+ cpu_to_le32(JFS_BAD_SAIT)) {
+ expected_AIM_bytesize = 2 * PSIZE;
+ AIM_bytesize = lengthPXD(&(j_sb->s_aim2)) * bsize;
+ expected_AIT_bytesize = 4 * PSIZE;
+ AIT_bytesize = lengthPXD(&(j_sb->s_ait2)) * bsize;
+ AIM_byte_addr = addressPXD(&(j_sb->s_aim2)) * bsize;
+ AIT_byte_addr = addressPXD(&(j_sb->s_ait2)) * bsize;
+ byte_addr_diff0 = AIT_byte_addr - AIM_byte_addr;
+ fsckwsp_addr = addressPXD(&(j_sb->s_fsckpxd)) * bsize;
+ byte_addr_diff1 = fsckwsp_addr - AIT_byte_addr;
+ if ((AIM_bytesize != expected_AIM_bytesize) ||
+ (AIT_bytesize != expected_AIT_bytesize) ||
+ (byte_addr_diff0 != AIM_bytesize) ||
+ (byte_addr_diff1 <= AIT_bytesize))
+ j_sb->s_flag |= cpu_to_le32(JFS_BAD_SAIT);
+ }
+
+ if ((j_sb->s_flag & cpu_to_le32(JFS_GROUPCOMMIT)) !=
+ cpu_to_le32(JFS_GROUPCOMMIT))
+ j_sb->s_flag |= cpu_to_le32(JFS_GROUPCOMMIT);
+
+ /* validate fs state */
+ if (j_sb->s_state != cpu_to_le32(FM_CLEAN) &&
+ !sb_rdonly(sb)) {
+ jfs_err("jfs_mount: Mount Failure: File System Dirty.");
+ rc = -EINVAL;
+ goto out;
+ }
+
+ sbi->state = le32_to_cpu(j_sb->s_state);
+ sbi->mntflag = le32_to_cpu(j_sb->s_flag);
+
+ /*
+ * JFS always does I/O by 4K pages. Don't tell the buffer cache
+ * that we use anything else (leave s_blocksize alone).
+ */
+ sbi->bsize = bsize;
+ sbi->l2bsize = le16_to_cpu(j_sb->s_l2bsize);
+
+ /* check some fields for possible corruption */
+ if (sbi->l2bsize != ilog2((u32)bsize) ||
+ j_sb->pad != 0 ||
+ le32_to_cpu(j_sb->s_state) > FM_STATE_MAX) {
+ rc = -EINVAL;
+ jfs_err("jfs_mount: Mount Failure: superblock is corrupt!");
+ goto out;
+ }
+
+ /*
+ * For now, ignore s_pbsize, l2bfactor. All I/O going through buffer
+ * cache.
+ */
+ sbi->nbperpage = PSIZE >> sbi->l2bsize;
+ sbi->l2nbperpage = L2PSIZE - sbi->l2bsize;
+ sbi->l2niperblk = sbi->l2bsize - L2DISIZE;
+ if (sbi->mntflag & JFS_INLINELOG)
+ sbi->logpxd = j_sb->s_logpxd;
+ else {
+ sbi->logdev = new_decode_dev(le32_to_cpu(j_sb->s_logdev));
+ uuid_copy(&sbi->uuid, &j_sb->s_uuid);
+ uuid_copy(&sbi->loguuid, &j_sb->s_loguuid);
+ }
+ sbi->fsckpxd = j_sb->s_fsckpxd;
+ sbi->ait2 = j_sb->s_ait2;
+
+ out:
+ brelse(bh);
+ return rc;
+}
+
+
+/*
+ * updateSuper()
+ *
+ * update synchronously superblock if it is mounted read-write.
+ */
+int updateSuper(struct super_block *sb, uint state)
+{
+ struct jfs_superblock *j_sb;
+ struct jfs_sb_info *sbi = JFS_SBI(sb);
+ struct buffer_head *bh;
+ int rc;
+
+ if (sbi->flag & JFS_NOINTEGRITY) {
+ if (state == FM_DIRTY) {
+ sbi->p_state = state;
+ return 0;
+ } else if (state == FM_MOUNT) {
+ sbi->p_state = sbi->state;
+ state = FM_DIRTY;
+ } else if (state == FM_CLEAN) {
+ state = sbi->p_state;
+ } else
+ jfs_err("updateSuper: bad state");
+ } else if (sbi->state == FM_DIRTY)
+ return 0;
+
+ if ((rc = readSuper(sb, &bh)))
+ return rc;
+
+ j_sb = (struct jfs_superblock *)bh->b_data;
+
+ j_sb->s_state = cpu_to_le32(state);
+ sbi->state = state;
+
+ if (state == FM_MOUNT) {
+ /* record log's dev_t and mount serial number */
+ j_sb->s_logdev = cpu_to_le32(new_encode_dev(sbi->log->bdev->bd_dev));
+ j_sb->s_logserial = cpu_to_le32(sbi->log->serial);
+ } else if (state == FM_CLEAN) {
+ /*
+ * If this volume is shared with OS/2, OS/2 will need to
+ * recalculate DASD usage, since we don't deal with it.
+ */
+ if (j_sb->s_flag & cpu_to_le32(JFS_DASD_ENABLED))
+ j_sb->s_flag |= cpu_to_le32(JFS_DASD_PRIME);
+ }
+
+ mark_buffer_dirty(bh);
+ sync_dirty_buffer(bh);
+ brelse(bh);
+
+ return 0;
+}
+
+
+/*
+ * readSuper()
+ *
+ * read superblock by raw sector address
+ */
+int readSuper(struct super_block *sb, struct buffer_head **bpp)
+{
+ /* read in primary superblock */
+ *bpp = sb_bread(sb, SUPER1_OFF >> sb->s_blocksize_bits);
+ if (*bpp)
+ return 0;
+
+ /* read in secondary/replicated superblock */
+ *bpp = sb_bread(sb, SUPER2_OFF >> sb->s_blocksize_bits);
+ if (*bpp)
+ return 0;
+
+ return -EIO;
+}
+
+
+/*
+ * logMOUNT()
+ *
+ * function: write a MOUNT log record for file system.
+ *
+ * MOUNT record keeps logredo() from processing log records
+ * for this file system past this point in log.
+ * it is harmless if mount fails.
+ *
+ * note: MOUNT record is at aggregate level, not at fileset level,
+ * since log records of previous mounts of a fileset
+ * (e.g., AFTER record of extent allocation) have to be processed
+ * to update block allocation map at aggregate level.
+ */
+static int logMOUNT(struct super_block *sb)
+{
+ struct jfs_log *log = JFS_SBI(sb)->log;
+ struct lrd lrd;
+
+ lrd.logtid = 0;
+ lrd.backchain = 0;
+ lrd.type = cpu_to_le16(LOG_MOUNT);
+ lrd.length = 0;
+ lrd.aggregate = cpu_to_le32(new_encode_dev(sb->s_bdev->bd_dev));
+ lmLog(log, NULL, &lrd, NULL);
+
+ return 0;
+}
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