1b2441318SGreg Kroah-Hartman // SPDX-License-Identifier: GPL-2.0
21da177e4SLinus Torvalds /*
31da177e4SLinus Torvalds * super.c
41da177e4SLinus Torvalds *
51da177e4SLinus Torvalds * Copyright (c) 1999 Al Smith
61da177e4SLinus Torvalds *
71da177e4SLinus Torvalds * Portions derived from work (c) 1995,1996 Christian Vogelgsang.
81da177e4SLinus Torvalds */
91da177e4SLinus Torvalds
101da177e4SLinus Torvalds #include <linux/init.h>
111da177e4SLinus Torvalds #include <linux/module.h>
12a5694255SChristoph Hellwig #include <linux/exportfs.h>
131da177e4SLinus Torvalds #include <linux/slab.h>
141da177e4SLinus Torvalds #include <linux/buffer_head.h>
151da177e4SLinus Torvalds #include <linux/vfs.h>
16621c1f42SChristoph Hellwig #include <linux/blkdev.h>
171da177e4SLinus Torvalds
1845254b4fSChristoph Hellwig #include "efs.h"
1945254b4fSChristoph Hellwig #include <linux/efs_vh.h>
2045254b4fSChristoph Hellwig #include <linux/efs_fs_sb.h>
2145254b4fSChristoph Hellwig
22726c3342SDavid Howells static int efs_statfs(struct dentry *dentry, struct kstatfs *buf);
231da177e4SLinus Torvalds static int efs_fill_super(struct super_block *s, void *d, int silent);
241da177e4SLinus Torvalds
efs_mount(struct file_system_type * fs_type,int flags,const char * dev_name,void * data)25152a0836SAl Viro static struct dentry *efs_mount(struct file_system_type *fs_type,
26152a0836SAl Viro int flags, const char *dev_name, void *data)
271da177e4SLinus Torvalds {
28152a0836SAl Viro return mount_bdev(fs_type, flags, dev_name, data, efs_fill_super);
291da177e4SLinus Torvalds }
301da177e4SLinus Torvalds
efs_kill_sb(struct super_block * s)315a9ed6f5SAl Viro static void efs_kill_sb(struct super_block *s)
325a9ed6f5SAl Viro {
335a9ed6f5SAl Viro struct efs_sb_info *sbi = SUPER_INFO(s);
345a9ed6f5SAl Viro kill_block_super(s);
355a9ed6f5SAl Viro kfree(sbi);
365a9ed6f5SAl Viro }
375a9ed6f5SAl Viro
381da177e4SLinus Torvalds static struct file_system_type efs_fs_type = {
391da177e4SLinus Torvalds .owner = THIS_MODULE,
401da177e4SLinus Torvalds .name = "efs",
41152a0836SAl Viro .mount = efs_mount,
425a9ed6f5SAl Viro .kill_sb = efs_kill_sb,
431da177e4SLinus Torvalds .fs_flags = FS_REQUIRES_DEV,
441da177e4SLinus Torvalds };
457f78e035SEric W. Biederman MODULE_ALIAS_FS("efs");
461da177e4SLinus Torvalds
471da177e4SLinus Torvalds static struct pt_types sgi_pt_types[] = {
481da177e4SLinus Torvalds {0x00, "SGI vh"},
491da177e4SLinus Torvalds {0x01, "SGI trkrepl"},
501da177e4SLinus Torvalds {0x02, "SGI secrepl"},
511da177e4SLinus Torvalds {0x03, "SGI raw"},
521da177e4SLinus Torvalds {0x04, "SGI bsd"},
531da177e4SLinus Torvalds {SGI_SYSV, "SGI sysv"},
541da177e4SLinus Torvalds {0x06, "SGI vol"},
551da177e4SLinus Torvalds {SGI_EFS, "SGI efs"},
561da177e4SLinus Torvalds {0x08, "SGI lv"},
571da177e4SLinus Torvalds {0x09, "SGI rlv"},
581da177e4SLinus Torvalds {0x0A, "SGI xfs"},
591da177e4SLinus Torvalds {0x0B, "SGI xfslog"},
601da177e4SLinus Torvalds {0x0C, "SGI xlv"},
611da177e4SLinus Torvalds {0x82, "Linux swap"},
621da177e4SLinus Torvalds {0x83, "Linux native"},
631da177e4SLinus Torvalds {0, NULL}
641da177e4SLinus Torvalds };
651da177e4SLinus Torvalds
661da177e4SLinus Torvalds
67e18b890bSChristoph Lameter static struct kmem_cache * efs_inode_cachep;
681da177e4SLinus Torvalds
efs_alloc_inode(struct super_block * sb)691da177e4SLinus Torvalds static struct inode *efs_alloc_inode(struct super_block *sb)
701da177e4SLinus Torvalds {
711da177e4SLinus Torvalds struct efs_inode_info *ei;
72*fd60b288SMuchun Song ei = alloc_inode_sb(sb, efs_inode_cachep, GFP_KERNEL);
731da177e4SLinus Torvalds if (!ei)
741da177e4SLinus Torvalds return NULL;
751da177e4SLinus Torvalds return &ei->vfs_inode;
761da177e4SLinus Torvalds }
771da177e4SLinus Torvalds
efs_free_inode(struct inode * inode)78f415c511SAl Viro static void efs_free_inode(struct inode *inode)
79fa0d7e3dSNick Piggin {
80fa0d7e3dSNick Piggin kmem_cache_free(efs_inode_cachep, INODE_INFO(inode));
81fa0d7e3dSNick Piggin }
82fa0d7e3dSNick Piggin
init_once(void * foo)8351cc5068SAlexey Dobriyan static void init_once(void *foo)
841da177e4SLinus Torvalds {
851da177e4SLinus Torvalds struct efs_inode_info *ei = (struct efs_inode_info *) foo;
861da177e4SLinus Torvalds
871da177e4SLinus Torvalds inode_init_once(&ei->vfs_inode);
881da177e4SLinus Torvalds }
891da177e4SLinus Torvalds
init_inodecache(void)907a42d4b6SFabian Frederick static int __init init_inodecache(void)
911da177e4SLinus Torvalds {
921da177e4SLinus Torvalds efs_inode_cachep = kmem_cache_create("efs_inode_cache",
935d097056SVladimir Davydov sizeof(struct efs_inode_info), 0,
945d097056SVladimir Davydov SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|
955d097056SVladimir Davydov SLAB_ACCOUNT, init_once);
961da177e4SLinus Torvalds if (efs_inode_cachep == NULL)
971da177e4SLinus Torvalds return -ENOMEM;
981da177e4SLinus Torvalds return 0;
991da177e4SLinus Torvalds }
1001da177e4SLinus Torvalds
destroy_inodecache(void)1011da177e4SLinus Torvalds static void destroy_inodecache(void)
1021da177e4SLinus Torvalds {
1038c0a8537SKirill A. Shutemov /*
1048c0a8537SKirill A. Shutemov * Make sure all delayed rcu free inodes are flushed before we
1058c0a8537SKirill A. Shutemov * destroy cache.
1068c0a8537SKirill A. Shutemov */
1078c0a8537SKirill A. Shutemov rcu_barrier();
1081a1d92c1SAlexey Dobriyan kmem_cache_destroy(efs_inode_cachep);
1091da177e4SLinus Torvalds }
1101da177e4SLinus Torvalds
efs_remount(struct super_block * sb,int * flags,char * data)1111da177e4SLinus Torvalds static int efs_remount(struct super_block *sb, int *flags, char *data)
1121da177e4SLinus Torvalds {
11302b9984dSTheodore Ts'o sync_filesystem(sb);
1141751e8a6SLinus Torvalds *flags |= SB_RDONLY;
1151da177e4SLinus Torvalds return 0;
1161da177e4SLinus Torvalds }
1171da177e4SLinus Torvalds
118ee9b6d61SJosef 'Jeff' Sipek static const struct super_operations efs_superblock_operations = {
1191da177e4SLinus Torvalds .alloc_inode = efs_alloc_inode,
120f415c511SAl Viro .free_inode = efs_free_inode,
1211da177e4SLinus Torvalds .statfs = efs_statfs,
1221da177e4SLinus Torvalds .remount_fs = efs_remount,
1231da177e4SLinus Torvalds };
1241da177e4SLinus Torvalds
12539655164SChristoph Hellwig static const struct export_operations efs_export_ops = {
12605da0804SChristoph Hellwig .fh_to_dentry = efs_fh_to_dentry,
12705da0804SChristoph Hellwig .fh_to_parent = efs_fh_to_parent,
1281da177e4SLinus Torvalds .get_parent = efs_get_parent,
1291da177e4SLinus Torvalds };
1301da177e4SLinus Torvalds
init_efs_fs(void)1311da177e4SLinus Torvalds static int __init init_efs_fs(void) {
1321da177e4SLinus Torvalds int err;
133f403d1dbSFabian Frederick pr_info(EFS_VERSION" - http://aeschi.ch.eu.org/efs/\n");
1341da177e4SLinus Torvalds err = init_inodecache();
1351da177e4SLinus Torvalds if (err)
1361da177e4SLinus Torvalds goto out1;
1371da177e4SLinus Torvalds err = register_filesystem(&efs_fs_type);
1381da177e4SLinus Torvalds if (err)
1391da177e4SLinus Torvalds goto out;
1401da177e4SLinus Torvalds return 0;
1411da177e4SLinus Torvalds out:
1421da177e4SLinus Torvalds destroy_inodecache();
1431da177e4SLinus Torvalds out1:
1441da177e4SLinus Torvalds return err;
1451da177e4SLinus Torvalds }
1461da177e4SLinus Torvalds
exit_efs_fs(void)1471da177e4SLinus Torvalds static void __exit exit_efs_fs(void) {
1481da177e4SLinus Torvalds unregister_filesystem(&efs_fs_type);
1491da177e4SLinus Torvalds destroy_inodecache();
1501da177e4SLinus Torvalds }
1511da177e4SLinus Torvalds
1521da177e4SLinus Torvalds module_init(init_efs_fs)
module_exit(exit_efs_fs)1531da177e4SLinus Torvalds module_exit(exit_efs_fs)
1541da177e4SLinus Torvalds
1551da177e4SLinus Torvalds static efs_block_t efs_validate_vh(struct volume_header *vh) {
1561da177e4SLinus Torvalds int i;
1571da177e4SLinus Torvalds __be32 cs, *ui;
1581da177e4SLinus Torvalds int csum;
1591da177e4SLinus Torvalds efs_block_t sblock = 0; /* shuts up gcc */
1601da177e4SLinus Torvalds struct pt_types *pt_entry;
1611da177e4SLinus Torvalds int pt_type, slice = -1;
1621da177e4SLinus Torvalds
1631da177e4SLinus Torvalds if (be32_to_cpu(vh->vh_magic) != VHMAGIC) {
1641da177e4SLinus Torvalds /*
1651da177e4SLinus Torvalds * assume that we're dealing with a partition and allow
1661da177e4SLinus Torvalds * read_super() to try and detect a valid superblock
1671da177e4SLinus Torvalds * on the next block.
1681da177e4SLinus Torvalds */
1691da177e4SLinus Torvalds return 0;
1701da177e4SLinus Torvalds }
1711da177e4SLinus Torvalds
1721da177e4SLinus Torvalds ui = ((__be32 *) (vh + 1)) - 1;
1731da177e4SLinus Torvalds for(csum = 0; ui >= ((__be32 *) vh);) {
1741da177e4SLinus Torvalds cs = *ui--;
1751da177e4SLinus Torvalds csum += be32_to_cpu(cs);
1761da177e4SLinus Torvalds }
1771da177e4SLinus Torvalds if (csum) {
178f403d1dbSFabian Frederick pr_warn("SGI disklabel: checksum bad, label corrupted\n");
1791da177e4SLinus Torvalds return 0;
1801da177e4SLinus Torvalds }
1811da177e4SLinus Torvalds
1821da177e4SLinus Torvalds #ifdef DEBUG
183d1826f2aSFabian Frederick pr_debug("bf: \"%16s\"\n", vh->vh_bootfile);
1841da177e4SLinus Torvalds
1851da177e4SLinus Torvalds for(i = 0; i < NVDIR; i++) {
1861da177e4SLinus Torvalds int j;
1871da177e4SLinus Torvalds char name[VDNAMESIZE+1];
1881da177e4SLinus Torvalds
1891da177e4SLinus Torvalds for(j = 0; j < VDNAMESIZE; j++) {
1901da177e4SLinus Torvalds name[j] = vh->vh_vd[i].vd_name[j];
1911da177e4SLinus Torvalds }
1921da177e4SLinus Torvalds name[j] = (char) 0;
1931da177e4SLinus Torvalds
1941da177e4SLinus Torvalds if (name[0]) {
195d1826f2aSFabian Frederick pr_debug("vh: %8s block: 0x%08x size: 0x%08x\n",
196d1826f2aSFabian Frederick name, (int) be32_to_cpu(vh->vh_vd[i].vd_lbn),
1971da177e4SLinus Torvalds (int) be32_to_cpu(vh->vh_vd[i].vd_nbytes));
1981da177e4SLinus Torvalds }
1991da177e4SLinus Torvalds }
2001da177e4SLinus Torvalds #endif
2011da177e4SLinus Torvalds
2021da177e4SLinus Torvalds for(i = 0; i < NPARTAB; i++) {
2031da177e4SLinus Torvalds pt_type = (int) be32_to_cpu(vh->vh_pt[i].pt_type);
2041da177e4SLinus Torvalds for(pt_entry = sgi_pt_types; pt_entry->pt_name; pt_entry++) {
2051da177e4SLinus Torvalds if (pt_type == pt_entry->pt_type) break;
2061da177e4SLinus Torvalds }
2071da177e4SLinus Torvalds #ifdef DEBUG
2081da177e4SLinus Torvalds if (be32_to_cpu(vh->vh_pt[i].pt_nblks)) {
209d1826f2aSFabian Frederick pr_debug("pt %2d: start: %08d size: %08d type: 0x%02x (%s)\n",
210d1826f2aSFabian Frederick i, (int)be32_to_cpu(vh->vh_pt[i].pt_firstlbn),
2111da177e4SLinus Torvalds (int)be32_to_cpu(vh->vh_pt[i].pt_nblks),
212d1826f2aSFabian Frederick pt_type, (pt_entry->pt_name) ?
213d1826f2aSFabian Frederick pt_entry->pt_name : "unknown");
2141da177e4SLinus Torvalds }
2151da177e4SLinus Torvalds #endif
2161da177e4SLinus Torvalds if (IS_EFS(pt_type)) {
2171da177e4SLinus Torvalds sblock = be32_to_cpu(vh->vh_pt[i].pt_firstlbn);
2181da177e4SLinus Torvalds slice = i;
2191da177e4SLinus Torvalds }
2201da177e4SLinus Torvalds }
2211da177e4SLinus Torvalds
2221da177e4SLinus Torvalds if (slice == -1) {
223f403d1dbSFabian Frederick pr_notice("partition table contained no EFS partitions\n");
2241da177e4SLinus Torvalds #ifdef DEBUG
2251da177e4SLinus Torvalds } else {
226f403d1dbSFabian Frederick pr_info("using slice %d (type %s, offset 0x%x)\n", slice,
2271da177e4SLinus Torvalds (pt_entry->pt_name) ? pt_entry->pt_name : "unknown",
2281da177e4SLinus Torvalds sblock);
2291da177e4SLinus Torvalds #endif
2301da177e4SLinus Torvalds }
231014c2544SJesper Juhl return sblock;
2321da177e4SLinus Torvalds }
2331da177e4SLinus Torvalds
efs_validate_super(struct efs_sb_info * sb,struct efs_super * super)2341da177e4SLinus Torvalds static int efs_validate_super(struct efs_sb_info *sb, struct efs_super *super) {
2351da177e4SLinus Torvalds
236014c2544SJesper Juhl if (!IS_EFS_MAGIC(be32_to_cpu(super->fs_magic)))
237014c2544SJesper Juhl return -1;
2381da177e4SLinus Torvalds
2391da177e4SLinus Torvalds sb->fs_magic = be32_to_cpu(super->fs_magic);
2401da177e4SLinus Torvalds sb->total_blocks = be32_to_cpu(super->fs_size);
2411da177e4SLinus Torvalds sb->first_block = be32_to_cpu(super->fs_firstcg);
2421da177e4SLinus Torvalds sb->group_size = be32_to_cpu(super->fs_cgfsize);
2431da177e4SLinus Torvalds sb->data_free = be32_to_cpu(super->fs_tfree);
2441da177e4SLinus Torvalds sb->inode_free = be32_to_cpu(super->fs_tinode);
2451da177e4SLinus Torvalds sb->inode_blocks = be16_to_cpu(super->fs_cgisize);
2461da177e4SLinus Torvalds sb->total_groups = be16_to_cpu(super->fs_ncg);
2471da177e4SLinus Torvalds
2481da177e4SLinus Torvalds return 0;
2491da177e4SLinus Torvalds }
2501da177e4SLinus Torvalds
efs_fill_super(struct super_block * s,void * d,int silent)2511da177e4SLinus Torvalds static int efs_fill_super(struct super_block *s, void *d, int silent)
2521da177e4SLinus Torvalds {
2531da177e4SLinus Torvalds struct efs_sb_info *sb;
2541da177e4SLinus Torvalds struct buffer_head *bh;
2551da177e4SLinus Torvalds struct inode *root;
2561da177e4SLinus Torvalds
257f8314dc6SPanagiotis Issaris sb = kzalloc(sizeof(struct efs_sb_info), GFP_KERNEL);
2581da177e4SLinus Torvalds if (!sb)
2591da177e4SLinus Torvalds return -ENOMEM;
2601da177e4SLinus Torvalds s->s_fs_info = sb;
26122b13969SDeepa Dinamani s->s_time_min = 0;
26222b13969SDeepa Dinamani s->s_time_max = U32_MAX;
2631da177e4SLinus Torvalds
2641da177e4SLinus Torvalds s->s_magic = EFS_SUPER_MAGIC;
2651da177e4SLinus Torvalds if (!sb_set_blocksize(s, EFS_BLOCKSIZE)) {
266f403d1dbSFabian Frederick pr_err("device does not support %d byte blocks\n",
2671da177e4SLinus Torvalds EFS_BLOCKSIZE);
2685a9ed6f5SAl Viro return -EINVAL;
2691da177e4SLinus Torvalds }
2701da177e4SLinus Torvalds
2711da177e4SLinus Torvalds /* read the vh (volume header) block */
2721da177e4SLinus Torvalds bh = sb_bread(s, 0);
2731da177e4SLinus Torvalds
2741da177e4SLinus Torvalds if (!bh) {
275f403d1dbSFabian Frederick pr_err("cannot read volume header\n");
2764108124fSHeloise return -EIO;
2771da177e4SLinus Torvalds }
2781da177e4SLinus Torvalds
2791da177e4SLinus Torvalds /*
2801da177e4SLinus Torvalds * if this returns zero then we didn't find any partition table.
2811da177e4SLinus Torvalds * this isn't (yet) an error - just assume for the moment that
2821da177e4SLinus Torvalds * the device is valid and go on to search for a superblock.
2831da177e4SLinus Torvalds */
2841da177e4SLinus Torvalds sb->fs_start = efs_validate_vh((struct volume_header *) bh->b_data);
2851da177e4SLinus Torvalds brelse(bh);
2861da177e4SLinus Torvalds
2871da177e4SLinus Torvalds if (sb->fs_start == -1) {
2885a9ed6f5SAl Viro return -EINVAL;
2891da177e4SLinus Torvalds }
2901da177e4SLinus Torvalds
2911da177e4SLinus Torvalds bh = sb_bread(s, sb->fs_start + EFS_SUPER);
2921da177e4SLinus Torvalds if (!bh) {
293f403d1dbSFabian Frederick pr_err("cannot read superblock\n");
2944108124fSHeloise return -EIO;
2951da177e4SLinus Torvalds }
2961da177e4SLinus Torvalds
2971da177e4SLinus Torvalds if (efs_validate_super(sb, (struct efs_super *) bh->b_data)) {
2981da177e4SLinus Torvalds #ifdef DEBUG
299f403d1dbSFabian Frederick pr_warn("invalid superblock at block %u\n",
300f403d1dbSFabian Frederick sb->fs_start + EFS_SUPER);
3011da177e4SLinus Torvalds #endif
3021da177e4SLinus Torvalds brelse(bh);
3035a9ed6f5SAl Viro return -EINVAL;
3041da177e4SLinus Torvalds }
3051da177e4SLinus Torvalds brelse(bh);
3061da177e4SLinus Torvalds
307bc98a42cSDavid Howells if (!sb_rdonly(s)) {
3081da177e4SLinus Torvalds #ifdef DEBUG
309f403d1dbSFabian Frederick pr_info("forcing read-only mode\n");
3101da177e4SLinus Torvalds #endif
3111751e8a6SLinus Torvalds s->s_flags |= SB_RDONLY;
3121da177e4SLinus Torvalds }
3131da177e4SLinus Torvalds s->s_op = &efs_superblock_operations;
3141da177e4SLinus Torvalds s->s_export_op = &efs_export_ops;
315298384cdSDavid Howells root = efs_iget(s, EFS_ROOTINODE);
316298384cdSDavid Howells if (IS_ERR(root)) {
317f403d1dbSFabian Frederick pr_err("get root inode failed\n");
3185a9ed6f5SAl Viro return PTR_ERR(root);
319298384cdSDavid Howells }
320298384cdSDavid Howells
32148fde701SAl Viro s->s_root = d_make_root(root);
322298384cdSDavid Howells if (!(s->s_root)) {
323f403d1dbSFabian Frederick pr_err("get root dentry failed\n");
3245a9ed6f5SAl Viro return -ENOMEM;
3251da177e4SLinus Torvalds }
3261da177e4SLinus Torvalds
3271da177e4SLinus Torvalds return 0;
3281da177e4SLinus Torvalds }
3291da177e4SLinus Torvalds
efs_statfs(struct dentry * dentry,struct kstatfs * buf)330726c3342SDavid Howells static int efs_statfs(struct dentry *dentry, struct kstatfs *buf) {
331514c91a9SColy Li struct super_block *sb = dentry->d_sb;
332514c91a9SColy Li struct efs_sb_info *sbi = SUPER_INFO(sb);
333514c91a9SColy Li u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
3341da177e4SLinus Torvalds
3351da177e4SLinus Torvalds buf->f_type = EFS_SUPER_MAGIC; /* efs magic number */
3361da177e4SLinus Torvalds buf->f_bsize = EFS_BLOCKSIZE; /* blocksize */
337514c91a9SColy Li buf->f_blocks = sbi->total_groups * /* total data blocks */
338514c91a9SColy Li (sbi->group_size - sbi->inode_blocks);
339514c91a9SColy Li buf->f_bfree = sbi->data_free; /* free data blocks */
340514c91a9SColy Li buf->f_bavail = sbi->data_free; /* free blocks for non-root */
341514c91a9SColy Li buf->f_files = sbi->total_groups * /* total inodes */
342514c91a9SColy Li sbi->inode_blocks *
3431da177e4SLinus Torvalds (EFS_BLOCKSIZE / sizeof(struct efs_dinode));
344514c91a9SColy Li buf->f_ffree = sbi->inode_free; /* free inodes */
3456d1349c7SAl Viro buf->f_fsid = u64_to_fsid(id);
3461da177e4SLinus Torvalds buf->f_namelen = EFS_MAXNAMELEN; /* max filename length */
3471da177e4SLinus Torvalds
3481da177e4SLinus Torvalds return 0;
3491da177e4SLinus Torvalds }
3501da177e4SLinus Torvalds
351