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![Al Viro](/assets/img/avatar_default.png)
Get rid of boilerplate in most of ->statfs() instances... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
494 lines
11 KiB
C
494 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* linux/fs/adfs/super.c
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*
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* Copyright (C) 1997-1999 Russell King
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/parser.h>
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#include <linux/mount.h>
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#include <linux/seq_file.h>
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#include <linux/slab.h>
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#include <linux/statfs.h>
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#include <linux/user_namespace.h>
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#include <linux/blkdev.h>
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#include "adfs.h"
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#include "dir_f.h"
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#include "dir_fplus.h"
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#define ADFS_SB_FLAGS SB_NOATIME
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#define ADFS_DEFAULT_OWNER_MASK S_IRWXU
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#define ADFS_DEFAULT_OTHER_MASK (S_IRWXG | S_IRWXO)
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void __adfs_error(struct super_block *sb, const char *function, const char *fmt, ...)
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{
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struct va_format vaf;
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va_list args;
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va_start(args, fmt);
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vaf.fmt = fmt;
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vaf.va = &args;
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printk(KERN_CRIT "ADFS-fs error (device %s)%s%s: %pV\n",
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sb->s_id, function ? ": " : "",
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function ? function : "", &vaf);
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va_end(args);
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}
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void adfs_msg(struct super_block *sb, const char *pfx, const char *fmt, ...)
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{
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struct va_format vaf;
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va_list args;
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va_start(args, fmt);
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vaf.fmt = fmt;
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vaf.va = &args;
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printk("%sADFS-fs (%s): %pV\n", pfx, sb->s_id, &vaf);
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va_end(args);
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}
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static int adfs_checkdiscrecord(struct adfs_discrecord *dr)
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{
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unsigned int max_idlen;
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int i;
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/* sector size must be 256, 512 or 1024 bytes */
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if (dr->log2secsize != 8 &&
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dr->log2secsize != 9 &&
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dr->log2secsize != 10)
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return 1;
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/* idlen must be at least log2secsize + 3 */
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if (dr->idlen < dr->log2secsize + 3)
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return 1;
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/* we cannot have such a large disc that we
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* are unable to represent sector offsets in
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* 32 bits. This works out at 2.0 TB.
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*/
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if (le32_to_cpu(dr->disc_size_high) >> dr->log2secsize)
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return 1;
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/*
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* Maximum idlen is limited to 16 bits for new directories by
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* the three-byte storage of an indirect disc address. For
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* big directories, idlen must be no greater than 19 v2 [1.0]
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*/
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max_idlen = dr->format_version ? 19 : 16;
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if (dr->idlen > max_idlen)
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return 1;
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/* reserved bytes should be zero */
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for (i = 0; i < sizeof(dr->unused52); i++)
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if (dr->unused52[i] != 0)
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return 1;
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return 0;
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}
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static void adfs_put_super(struct super_block *sb)
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{
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struct adfs_sb_info *asb = ADFS_SB(sb);
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adfs_free_map(sb);
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kfree_rcu(asb, rcu);
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}
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static int adfs_show_options(struct seq_file *seq, struct dentry *root)
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{
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struct adfs_sb_info *asb = ADFS_SB(root->d_sb);
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if (!uid_eq(asb->s_uid, GLOBAL_ROOT_UID))
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seq_printf(seq, ",uid=%u", from_kuid_munged(&init_user_ns, asb->s_uid));
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if (!gid_eq(asb->s_gid, GLOBAL_ROOT_GID))
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seq_printf(seq, ",gid=%u", from_kgid_munged(&init_user_ns, asb->s_gid));
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if (asb->s_owner_mask != ADFS_DEFAULT_OWNER_MASK)
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seq_printf(seq, ",ownmask=%o", asb->s_owner_mask);
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if (asb->s_other_mask != ADFS_DEFAULT_OTHER_MASK)
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seq_printf(seq, ",othmask=%o", asb->s_other_mask);
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if (asb->s_ftsuffix != 0)
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seq_printf(seq, ",ftsuffix=%u", asb->s_ftsuffix);
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return 0;
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}
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enum {Opt_uid, Opt_gid, Opt_ownmask, Opt_othmask, Opt_ftsuffix, Opt_err};
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static const match_table_t tokens = {
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{Opt_uid, "uid=%u"},
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{Opt_gid, "gid=%u"},
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{Opt_ownmask, "ownmask=%o"},
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{Opt_othmask, "othmask=%o"},
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{Opt_ftsuffix, "ftsuffix=%u"},
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{Opt_err, NULL}
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};
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static int parse_options(struct super_block *sb, struct adfs_sb_info *asb,
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char *options)
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{
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char *p;
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int option;
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if (!options)
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return 0;
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while ((p = strsep(&options, ",")) != NULL) {
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substring_t args[MAX_OPT_ARGS];
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int token;
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if (!*p)
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continue;
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token = match_token(p, tokens, args);
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switch (token) {
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case Opt_uid:
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if (match_int(args, &option))
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return -EINVAL;
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asb->s_uid = make_kuid(current_user_ns(), option);
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if (!uid_valid(asb->s_uid))
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return -EINVAL;
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break;
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case Opt_gid:
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if (match_int(args, &option))
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return -EINVAL;
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asb->s_gid = make_kgid(current_user_ns(), option);
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if (!gid_valid(asb->s_gid))
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return -EINVAL;
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break;
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case Opt_ownmask:
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if (match_octal(args, &option))
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return -EINVAL;
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asb->s_owner_mask = option;
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break;
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case Opt_othmask:
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if (match_octal(args, &option))
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return -EINVAL;
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asb->s_other_mask = option;
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break;
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case Opt_ftsuffix:
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if (match_int(args, &option))
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return -EINVAL;
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asb->s_ftsuffix = option;
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break;
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default:
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adfs_msg(sb, KERN_ERR,
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"unrecognised mount option \"%s\" or missing value",
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p);
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return -EINVAL;
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}
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}
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return 0;
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}
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static int adfs_remount(struct super_block *sb, int *flags, char *data)
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{
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struct adfs_sb_info temp_asb;
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int ret;
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sync_filesystem(sb);
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*flags |= ADFS_SB_FLAGS;
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temp_asb = *ADFS_SB(sb);
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ret = parse_options(sb, &temp_asb, data);
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if (ret == 0)
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*ADFS_SB(sb) = temp_asb;
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return ret;
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}
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static int adfs_statfs(struct dentry *dentry, struct kstatfs *buf)
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{
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struct super_block *sb = dentry->d_sb;
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struct adfs_sb_info *sbi = ADFS_SB(sb);
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u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
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adfs_map_statfs(sb, buf);
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buf->f_type = ADFS_SUPER_MAGIC;
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buf->f_namelen = sbi->s_namelen;
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buf->f_bsize = sb->s_blocksize;
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buf->f_ffree = (long)(buf->f_bfree * buf->f_files) / (long)buf->f_blocks;
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buf->f_fsid = u64_to_fsid(id);
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return 0;
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}
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static struct kmem_cache *adfs_inode_cachep;
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static struct inode *adfs_alloc_inode(struct super_block *sb)
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{
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struct adfs_inode_info *ei;
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ei = kmem_cache_alloc(adfs_inode_cachep, GFP_KERNEL);
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if (!ei)
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return NULL;
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return &ei->vfs_inode;
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}
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static void adfs_free_inode(struct inode *inode)
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{
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kmem_cache_free(adfs_inode_cachep, ADFS_I(inode));
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}
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static int adfs_drop_inode(struct inode *inode)
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{
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/* always drop inodes if we are read-only */
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return !IS_ENABLED(CONFIG_ADFS_FS_RW) || IS_RDONLY(inode);
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}
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static void init_once(void *foo)
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{
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struct adfs_inode_info *ei = (struct adfs_inode_info *) foo;
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inode_init_once(&ei->vfs_inode);
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}
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static int __init init_inodecache(void)
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{
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adfs_inode_cachep = kmem_cache_create("adfs_inode_cache",
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sizeof(struct adfs_inode_info),
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0, (SLAB_RECLAIM_ACCOUNT|
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SLAB_MEM_SPREAD|SLAB_ACCOUNT),
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init_once);
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if (adfs_inode_cachep == NULL)
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return -ENOMEM;
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return 0;
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}
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static void destroy_inodecache(void)
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{
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/*
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* Make sure all delayed rcu free inodes are flushed before we
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* destroy cache.
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*/
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rcu_barrier();
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kmem_cache_destroy(adfs_inode_cachep);
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}
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static const struct super_operations adfs_sops = {
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.alloc_inode = adfs_alloc_inode,
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.free_inode = adfs_free_inode,
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.drop_inode = adfs_drop_inode,
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.write_inode = adfs_write_inode,
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.put_super = adfs_put_super,
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.statfs = adfs_statfs,
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.remount_fs = adfs_remount,
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.show_options = adfs_show_options,
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};
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static int adfs_probe(struct super_block *sb, unsigned int offset, int silent,
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int (*validate)(struct super_block *sb,
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struct buffer_head *bh,
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struct adfs_discrecord **bhp))
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{
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struct adfs_sb_info *asb = ADFS_SB(sb);
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struct adfs_discrecord *dr;
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struct buffer_head *bh;
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unsigned int blocksize = BLOCK_SIZE;
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int ret, try;
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for (try = 0; try < 2; try++) {
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/* try to set the requested block size */
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if (sb->s_blocksize != blocksize &&
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!sb_set_blocksize(sb, blocksize)) {
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if (!silent)
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adfs_msg(sb, KERN_ERR,
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"error: unsupported blocksize");
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return -EINVAL;
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}
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/* read the buffer */
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bh = sb_bread(sb, offset >> sb->s_blocksize_bits);
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if (!bh) {
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adfs_msg(sb, KERN_ERR,
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"error: unable to read block %u, try %d",
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offset >> sb->s_blocksize_bits, try);
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return -EIO;
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}
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/* validate it */
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ret = validate(sb, bh, &dr);
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if (ret) {
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brelse(bh);
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return ret;
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}
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/* does the block size match the filesystem block size? */
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blocksize = 1 << dr->log2secsize;
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if (sb->s_blocksize == blocksize) {
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asb->s_map = adfs_read_map(sb, dr);
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brelse(bh);
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return PTR_ERR_OR_ZERO(asb->s_map);
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}
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brelse(bh);
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}
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return -EIO;
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}
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static int adfs_validate_bblk(struct super_block *sb, struct buffer_head *bh,
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struct adfs_discrecord **drp)
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{
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struct adfs_discrecord *dr;
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unsigned char *b_data;
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b_data = bh->b_data + (ADFS_DISCRECORD % sb->s_blocksize);
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if (adfs_checkbblk(b_data))
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return -EILSEQ;
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/* Do some sanity checks on the ADFS disc record */
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dr = (struct adfs_discrecord *)(b_data + ADFS_DR_OFFSET);
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if (adfs_checkdiscrecord(dr))
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return -EILSEQ;
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*drp = dr;
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return 0;
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}
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static int adfs_validate_dr0(struct super_block *sb, struct buffer_head *bh,
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struct adfs_discrecord **drp)
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{
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struct adfs_discrecord *dr;
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/* Do some sanity checks on the ADFS disc record */
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dr = (struct adfs_discrecord *)(bh->b_data + 4);
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if (adfs_checkdiscrecord(dr) || dr->nzones_high || dr->nzones != 1)
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return -EILSEQ;
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*drp = dr;
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return 0;
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}
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static int adfs_fill_super(struct super_block *sb, void *data, int silent)
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{
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struct adfs_discrecord *dr;
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struct object_info root_obj;
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struct adfs_sb_info *asb;
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struct inode *root;
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int ret = -EINVAL;
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sb->s_flags |= ADFS_SB_FLAGS;
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asb = kzalloc(sizeof(*asb), GFP_KERNEL);
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if (!asb)
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return -ENOMEM;
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sb->s_fs_info = asb;
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sb->s_magic = ADFS_SUPER_MAGIC;
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sb->s_time_gran = 10000000;
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/* set default options */
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asb->s_uid = GLOBAL_ROOT_UID;
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asb->s_gid = GLOBAL_ROOT_GID;
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asb->s_owner_mask = ADFS_DEFAULT_OWNER_MASK;
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asb->s_other_mask = ADFS_DEFAULT_OTHER_MASK;
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asb->s_ftsuffix = 0;
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if (parse_options(sb, asb, data))
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goto error;
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/* Try to probe the filesystem boot block */
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ret = adfs_probe(sb, ADFS_DISCRECORD, 1, adfs_validate_bblk);
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if (ret == -EILSEQ)
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ret = adfs_probe(sb, 0, silent, adfs_validate_dr0);
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if (ret == -EILSEQ) {
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if (!silent)
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adfs_msg(sb, KERN_ERR,
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"error: can't find an ADFS filesystem on dev %s.",
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sb->s_id);
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ret = -EINVAL;
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}
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if (ret)
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goto error;
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/* set up enough so that we can read an inode */
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sb->s_op = &adfs_sops;
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dr = adfs_map_discrecord(asb->s_map);
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root_obj.parent_id = root_obj.indaddr = le32_to_cpu(dr->root);
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root_obj.name_len = 0;
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/* Set root object date as 01 Jan 1987 00:00:00 */
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root_obj.loadaddr = 0xfff0003f;
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root_obj.execaddr = 0xec22c000;
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root_obj.size = ADFS_NEWDIR_SIZE;
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root_obj.attr = ADFS_NDA_DIRECTORY | ADFS_NDA_OWNER_READ |
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ADFS_NDA_OWNER_WRITE | ADFS_NDA_PUBLIC_READ;
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/*
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* If this is a F+ disk with variable length directories,
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* get the root_size from the disc record.
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*/
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if (dr->format_version) {
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root_obj.size = le32_to_cpu(dr->root_size);
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asb->s_dir = &adfs_fplus_dir_ops;
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asb->s_namelen = ADFS_FPLUS_NAME_LEN;
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} else {
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asb->s_dir = &adfs_f_dir_ops;
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asb->s_namelen = ADFS_F_NAME_LEN;
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}
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/*
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* ,xyz hex filetype suffix may be added by driver
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* to files that have valid RISC OS filetype
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*/
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if (asb->s_ftsuffix)
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asb->s_namelen += 4;
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sb->s_d_op = &adfs_dentry_operations;
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root = adfs_iget(sb, &root_obj);
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sb->s_root = d_make_root(root);
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if (!sb->s_root) {
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adfs_free_map(sb);
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adfs_error(sb, "get root inode failed\n");
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ret = -EIO;
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goto error;
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}
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return 0;
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error:
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sb->s_fs_info = NULL;
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kfree(asb);
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return ret;
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}
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static struct dentry *adfs_mount(struct file_system_type *fs_type,
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int flags, const char *dev_name, void *data)
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{
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return mount_bdev(fs_type, flags, dev_name, data, adfs_fill_super);
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}
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static struct file_system_type adfs_fs_type = {
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.owner = THIS_MODULE,
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.name = "adfs",
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.mount = adfs_mount,
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.kill_sb = kill_block_super,
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.fs_flags = FS_REQUIRES_DEV,
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};
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MODULE_ALIAS_FS("adfs");
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static int __init init_adfs_fs(void)
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{
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int err = init_inodecache();
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if (err)
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goto out1;
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err = register_filesystem(&adfs_fs_type);
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if (err)
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goto out;
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return 0;
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out:
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destroy_inodecache();
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out1:
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return err;
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}
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static void __exit exit_adfs_fs(void)
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{
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unregister_filesystem(&adfs_fs_type);
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destroy_inodecache();
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}
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module_init(init_adfs_fs)
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module_exit(exit_adfs_fs)
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MODULE_LICENSE("GPL");
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