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[/] [or1k/] [tags/] [LINUX_2_4_26_OR32/] [linux/] [linux-2.4/] [fs/] [affs/] [super.c] - Rev 1279
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/* * linux/fs/affs/inode.c * * (c) 1996 Hans-Joachim Widmaier - Rewritten * * (C) 1993 Ray Burr - Modified for Amiga FFS filesystem. * * (C) 1992 Eric Youngdale Modified for ISO 9660 filesystem. * * (C) 1991 Linus Torvalds - minix filesystem */ #include <linux/module.h> #include <linux/errno.h> #include <linux/fs.h> #include <linux/slab.h> #include <linux/stat.h> #include <linux/sched.h> #include <linux/affs_fs.h> #include <linux/kernel.h> #include <linux/mm.h> #include <linux/string.h> #include <linux/locks.h> #include <linux/genhd.h> #include <linux/amigaffs.h> #include <linux/major.h> #include <linux/blkdev.h> #include <linux/init.h> #include <asm/system.h> #include <asm/uaccess.h> extern int *blk_size[]; extern struct timezone sys_tz; static int affs_statfs(struct super_block *sb, struct statfs *buf); static int affs_remount (struct super_block *sb, int *flags, char *data); static void affs_put_super(struct super_block *sb) { pr_debug("AFFS: put_super()\n"); if (!(sb->s_flags & MS_RDONLY)) { AFFS_ROOT_TAIL(sb, AFFS_SB->s_root_bh)->bm_flag = be32_to_cpu(1); secs_to_datestamp(CURRENT_TIME, &AFFS_ROOT_TAIL(sb, AFFS_SB->s_root_bh)->disk_change); affs_fix_checksum(sb, AFFS_SB->s_root_bh); mark_buffer_dirty(AFFS_SB->s_root_bh); } affs_brelse(AFFS_SB->s_bmap_bh); if (AFFS_SB->s_prefix) kfree(AFFS_SB->s_prefix); kfree(AFFS_SB->s_bitmap); affs_brelse(AFFS_SB->s_root_bh); return; } static void affs_write_super(struct super_block *sb) { int clean = 2; if (!(sb->s_flags & MS_RDONLY)) { // if (AFFS_SB->s_bitmap[i].bm_bh) { // if (buffer_dirty(AFFS_SB->s_bitmap[i].bm_bh)) { // clean = 0; AFFS_ROOT_TAIL(sb, AFFS_SB->s_root_bh)->bm_flag = be32_to_cpu(clean); secs_to_datestamp(CURRENT_TIME, &AFFS_ROOT_TAIL(sb, AFFS_SB->s_root_bh)->disk_change); affs_fix_checksum(sb, AFFS_SB->s_root_bh); mark_buffer_dirty(AFFS_SB->s_root_bh); sb->s_dirt = !clean; /* redo until bitmap synced */ } else sb->s_dirt = 0; pr_debug("AFFS: write_super() at %lu, clean=%d\n", CURRENT_TIME, clean); } static struct super_operations affs_sops = { read_inode: affs_read_inode, write_inode: affs_write_inode, put_inode: affs_put_inode, delete_inode: affs_delete_inode, clear_inode: affs_clear_inode, put_super: affs_put_super, write_super: affs_write_super, statfs: affs_statfs, remount_fs: affs_remount, }; static int parse_options(char *options, uid_t *uid, gid_t *gid, int *mode, int *reserved, s32 *root, int *blocksize, char **prefix, char *volume, unsigned long *mount_opts) { char *this_char, *value, *optn; int f; /* Fill in defaults */ *uid = current->uid; *gid = current->gid; *reserved = 2; *root = -1; *blocksize = -1; volume[0] = ':'; volume[1] = 0; *mount_opts = 0; if (!options) return 1; for (this_char = strtok(options,","); this_char; this_char = strtok(NULL,",")) { f = 0; if ((value = strchr(this_char,'=')) != NULL) *value++ = 0; if ((optn = "protect") && !strcmp(this_char, optn)) { if (value) goto out_inv_arg; *mount_opts |= SF_IMMUTABLE; } else if ((optn = "verbose") && !strcmp(this_char, optn)) { if (value) goto out_inv_arg; *mount_opts |= SF_VERBOSE; } else if ((optn = "mufs") && !strcmp(this_char, optn)) { if (value) goto out_inv_arg; *mount_opts |= SF_MUFS; } else if ((f = !strcmp(this_char,"setuid")) || !strcmp(this_char,"setgid")) { if (value) { if (!*value) { printk("AFFS: Argument for set[ug]id option missing\n"); return 0; } else { (f ? *uid : *gid) = simple_strtoul(value,&value,0); if (*value) { printk("AFFS: Bad set[ug]id argument\n"); return 0; } *mount_opts |= f ? SF_SETUID : SF_SETGID; } } } else if (!strcmp(this_char,"prefix")) { optn = "prefix"; if (!value || !*value) goto out_no_arg; if (*prefix) { /* Free any previous prefix */ kfree(*prefix); *prefix = NULL; } *prefix = kmalloc(strlen(value) + 1,GFP_KERNEL); if (!*prefix) return 0; strcpy(*prefix,value); *mount_opts |= SF_PREFIX; } else if (!strcmp(this_char,"volume")) { optn = "volume"; if (!value || !*value) goto out_no_arg; if (strlen(value) > 30) value[30] = 0; strncpy(volume,value,30); } else if (!strcmp(this_char,"mode")) { optn = "mode"; if (!value || !*value) goto out_no_arg; *mode = simple_strtoul(value,&value,8) & 0777; if (*value) return 0; *mount_opts |= SF_SETMODE; } else if (!strcmp(this_char,"reserved")) { optn = "reserved"; if (!value || !*value) goto out_no_arg; *reserved = simple_strtoul(value,&value,0); if (*value) return 0; } else if (!strcmp(this_char,"root")) { optn = "root"; if (!value || !*value) goto out_no_arg; *root = simple_strtoul(value,&value,0); if (*value) return 0; } else if (!strcmp(this_char,"bs")) { optn = "bs"; if (!value || !*value) goto out_no_arg; *blocksize = simple_strtoul(value,&value,0); if (*value) return 0; if (*blocksize != 512 && *blocksize != 1024 && *blocksize != 2048 && *blocksize != 4096) { printk ("AFFS: Invalid blocksize (512, 1024, 2048, 4096 allowed)\n"); return 0; } } else if (!strcmp (this_char, "grpquota") || !strcmp (this_char, "noquota") || !strcmp (this_char, "quota") || !strcmp (this_char, "usrquota")) /* Silently ignore the quota options */ ; else { printk("AFFS: Unrecognized mount option %s\n", this_char); return 0; } } return 1; out_no_arg: printk("AFFS: The %s option requires an argument\n", optn); return 0; out_inv_arg: printk("AFFS: Option %s does not take an argument\n", optn); return 0; } /* This function definitely needs to be split up. Some fine day I'll * hopefully have the guts to do so. Until then: sorry for the mess. */ static struct super_block * affs_read_super(struct super_block *sb, void *data, int silent) { struct buffer_head *root_bh = NULL; struct buffer_head *boot_bh; struct inode *root_inode = NULL; kdev_t dev = sb->s_dev; s32 root_block; int blocks, size, blocksize; u32 chksum; int num_bm; int i, j; s32 key; uid_t uid; gid_t gid; int reserved; unsigned long mount_flags; pr_debug("AFFS: read_super(%s)\n",data ? (const char *)data : "no options"); sb->s_magic = AFFS_SUPER_MAGIC; sb->s_op = &affs_sops; memset(AFFS_SB, 0, sizeof(*AFFS_SB)); init_MUTEX(&AFFS_SB->s_bmlock); if (!parse_options(data,&uid,&gid,&i,&reserved,&root_block, &blocksize,&AFFS_SB->s_prefix, AFFS_SB->s_volume, &mount_flags)) { printk(KERN_ERR "AFFS: Error parsing options\n"); return NULL; } /* N.B. after this point s_prefix must be released */ AFFS_SB->s_flags = mount_flags; AFFS_SB->s_mode = i; AFFS_SB->s_uid = uid; AFFS_SB->s_gid = gid; AFFS_SB->s_reserved= reserved; /* Get the size of the device in 512-byte blocks. * If we later see that the partition uses bigger * blocks, we will have to change it. */ blocks = blk_size[MAJOR(dev)] ? blk_size[MAJOR(dev)][MINOR(dev)] : 0; if (!blocks) { printk(KERN_ERR "AFFS: Could not determine device size\n"); goto out_error; } size = (BLOCK_SIZE / 512) * blocks; pr_debug("AFFS: initial blksize=%d, blocks=%d\n", 512, blocks); affs_set_blocksize(sb, PAGE_SIZE); /* Try to find root block. Its location depends on the block size. */ i = 512; j = 4096; if (blocksize > 0) { i = j = blocksize; size = size / (blocksize / 512); } for (blocksize = i, key = 0; blocksize <= j; blocksize <<= 1, size >>= 1) { AFFS_SB->s_root_block = root_block; if (root_block < 0) AFFS_SB->s_root_block = (reserved + size - 1) / 2; pr_debug("AFFS: setting blocksize to %d\n", blocksize); affs_set_blocksize(sb, blocksize); AFFS_SB->s_partition_size = size; /* The root block location that was calculated above is not * correct if the partition size is an odd number of 512- * byte blocks, which will be rounded down to a number of * 1024-byte blocks, and if there were an even number of * reserved blocks. Ideally, all partition checkers should * report the real number of blocks of the real blocksize, * but since this just cannot be done, we have to try to * find the root block anyways. In the above case, it is one * block behind the calculated one. So we check this one, too. */ for (num_bm = 0; num_bm < 2; num_bm++) { pr_debug("AFFS: Dev %s, trying root=%u, bs=%d, " "size=%d, reserved=%d\n", kdevname(dev), AFFS_SB->s_root_block + num_bm, blocksize, size, reserved); root_bh = affs_bread(sb, AFFS_SB->s_root_block + num_bm); if (!root_bh) continue; if (!affs_checksum_block(sb, root_bh) && be32_to_cpu(AFFS_ROOT_HEAD(root_bh)->ptype) == T_SHORT && be32_to_cpu(AFFS_ROOT_TAIL(sb, root_bh)->stype) == ST_ROOT) { AFFS_SB->s_hashsize = blocksize / 4 - 56; AFFS_SB->s_root_block += num_bm; key = 1; goto got_root; } affs_brelse(root_bh); root_bh = NULL; } } if (!silent) printk(KERN_ERR "AFFS: No valid root block on device %s\n", kdevname(dev)); goto out_error; /* N.B. after this point bh must be released */ got_root: root_block = AFFS_SB->s_root_block; sb->s_blocksize_bits = blocksize == 512 ? 9 : blocksize == 1024 ? 10 : blocksize == 2048 ? 11 : 12; /* Find out which kind of FS we have */ boot_bh = sb_bread(sb, 0); if (!boot_bh) { printk(KERN_ERR "AFFS: Cannot read boot block\n"); goto out_error; } chksum = be32_to_cpu(*(u32 *)boot_bh->b_data); brelse(boot_bh); /* Dircache filesystems are compatible with non-dircache ones * when reading. As long as they aren't supported, writing is * not recommended. */ if ((chksum == FS_DCFFS || chksum == MUFS_DCFFS || chksum == FS_DCOFS || chksum == MUFS_DCOFS) && !(sb->s_flags & MS_RDONLY)) { printk(KERN_NOTICE "AFFS: Dircache FS - mounting %s read only\n", kdevname(dev)); sb->s_flags |= MS_RDONLY; AFFS_SB->s_flags |= SF_READONLY; } switch (chksum) { case MUFS_FS: case MUFS_INTLFFS: case MUFS_DCFFS: AFFS_SB->s_flags |= SF_MUFS; /* fall thru */ case FS_INTLFFS: case FS_DCFFS: AFFS_SB->s_flags |= SF_INTL; break; case MUFS_FFS: AFFS_SB->s_flags |= SF_MUFS; break; case FS_FFS: break; case MUFS_OFS: AFFS_SB->s_flags |= SF_MUFS; /* fall thru */ case FS_OFS: AFFS_SB->s_flags |= SF_OFS; sb->s_flags |= MS_NOEXEC; break; case MUFS_DCOFS: case MUFS_INTLOFS: AFFS_SB->s_flags |= SF_MUFS; case FS_DCOFS: case FS_INTLOFS: AFFS_SB->s_flags |= SF_INTL | SF_OFS; sb->s_flags |= MS_NOEXEC; break; default: printk(KERN_ERR "AFFS: Unknown filesystem on device %s: %08X\n", kdevname(dev), chksum); goto out_error; } if (mount_flags & SF_VERBOSE) { chksum = cpu_to_be32(chksum); printk(KERN_NOTICE "AFFS: Mounting volume \"%*s\": Type=%.3s\\%c, Blocksize=%d\n", AFFS_ROOT_TAIL(sb, root_bh)->disk_name[0], AFFS_ROOT_TAIL(sb, root_bh)->disk_name + 1, (char *)&chksum,((char *)&chksum)[3] + '0',blocksize); } sb->s_flags |= MS_NODEV | MS_NOSUID; AFFS_SB->s_data_blksize = sb->s_blocksize; if (AFFS_SB->s_flags & SF_OFS) AFFS_SB->s_data_blksize -= 24; /* Keep super block in cache */ AFFS_SB->s_root_bh = root_bh; /* N.B. after this point s_root_bh must be released */ if (affs_init_bitmap(sb)) goto out_error; /* set up enough so that it can read an inode */ root_inode = iget(sb, root_block); sb->s_root = d_alloc_root(root_inode); if (!sb->s_root) { printk(KERN_ERR "AFFS: Get root inode failed\n"); goto out_error; } sb->s_root->d_op = &affs_dentry_operations; pr_debug("AFFS: s_flags=%lX\n",sb->s_flags); return sb; /* * Begin the cascaded cleanup ... */ out_error: if (root_inode) iput(root_inode); if (AFFS_SB->s_bitmap) kfree(AFFS_SB->s_bitmap); affs_brelse(root_bh); if (AFFS_SB->s_prefix) kfree(AFFS_SB->s_prefix); return NULL; } static int affs_remount(struct super_block *sb, int *flags, char *data) { int blocksize; uid_t uid; gid_t gid; int mode; int reserved; int root_block; unsigned long mount_flags; unsigned long read_only = AFFS_SB->s_flags & SF_READONLY; pr_debug("AFFS: remount(flags=0x%x,opts=\"%s\")\n",*flags,data); if (!parse_options(data,&uid,&gid,&mode,&reserved,&root_block, &blocksize,&AFFS_SB->s_prefix,AFFS_SB->s_volume,&mount_flags)) return -EINVAL; AFFS_SB->s_flags = mount_flags | read_only; AFFS_SB->s_mode = mode; AFFS_SB->s_uid = uid; AFFS_SB->s_gid = gid; if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) return 0; if (*flags & MS_RDONLY) { sb->s_dirt = 1; while (sb->s_dirt) affs_write_super(sb); sb->s_flags |= MS_RDONLY; } else if (!(AFFS_SB->s_flags & SF_READONLY)) { sb->s_flags &= ~MS_RDONLY; } else { affs_warning(sb,"remount","Cannot remount fs read/write because of errors"); return -EINVAL; } return 0; } static int affs_statfs(struct super_block *sb, struct statfs *buf) { int free; pr_debug("AFFS: statfs() partsize=%d, reserved=%d\n",AFFS_SB->s_partition_size, AFFS_SB->s_reserved); free = affs_count_free_blocks(sb); buf->f_type = AFFS_SUPER_MAGIC; buf->f_bsize = sb->s_blocksize; buf->f_blocks = AFFS_SB->s_partition_size - AFFS_SB->s_reserved; buf->f_bfree = free; buf->f_bavail = free; return 0; } static DECLARE_FSTYPE_DEV(affs_fs_type, "affs", affs_read_super); static int __init init_affs_fs(void) { return register_filesystem(&affs_fs_type); } static void __exit exit_affs_fs(void) { unregister_filesystem(&affs_fs_type); } EXPORT_NO_SYMBOLS; MODULE_DESCRIPTION("Amiga filesystem support for Linux"); MODULE_LICENSE("GPL"); module_init(init_affs_fs) module_exit(exit_affs_fs)
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