You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
574 lines
14 KiB
574 lines
14 KiB
/* |
|
* 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/init.h> |
|
#include <linux/statfs.h> |
|
#include <linux/parser.h> |
|
#include <linux/magic.h> |
|
#include <linux/sched.h> |
|
#include "affs.h" |
|
|
|
extern struct timezone sys_tz; |
|
|
|
static int affs_statfs(struct dentry *dentry, struct kstatfs *buf); |
|
static int affs_remount (struct super_block *sb, int *flags, char *data); |
|
|
|
static void |
|
affs_put_super(struct super_block *sb) |
|
{ |
|
struct affs_sb_info *sbi = AFFS_SB(sb); |
|
pr_debug("AFFS: put_super()\n"); |
|
|
|
if (!(sb->s_flags & MS_RDONLY)) { |
|
AFFS_ROOT_TAIL(sb, sbi->s_root_bh)->bm_flag = cpu_to_be32(1); |
|
secs_to_datestamp(get_seconds(), |
|
&AFFS_ROOT_TAIL(sb, sbi->s_root_bh)->disk_change); |
|
affs_fix_checksum(sb, sbi->s_root_bh); |
|
mark_buffer_dirty(sbi->s_root_bh); |
|
} |
|
|
|
kfree(sbi->s_prefix); |
|
affs_free_bitmap(sb); |
|
affs_brelse(sbi->s_root_bh); |
|
kfree(sbi); |
|
sb->s_fs_info = NULL; |
|
return; |
|
} |
|
|
|
static void |
|
affs_write_super(struct super_block *sb) |
|
{ |
|
int clean = 2; |
|
struct affs_sb_info *sbi = AFFS_SB(sb); |
|
|
|
if (!(sb->s_flags & MS_RDONLY)) { |
|
// if (sbi->s_bitmap[i].bm_bh) { |
|
// if (buffer_dirty(sbi->s_bitmap[i].bm_bh)) { |
|
// clean = 0; |
|
AFFS_ROOT_TAIL(sb, sbi->s_root_bh)->bm_flag = cpu_to_be32(clean); |
|
secs_to_datestamp(get_seconds(), |
|
&AFFS_ROOT_TAIL(sb, sbi->s_root_bh)->disk_change); |
|
affs_fix_checksum(sb, sbi->s_root_bh); |
|
mark_buffer_dirty(sbi->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", get_seconds(), clean); |
|
} |
|
|
|
static struct kmem_cache * affs_inode_cachep; |
|
|
|
static struct inode *affs_alloc_inode(struct super_block *sb) |
|
{ |
|
struct affs_inode_info *ei; |
|
ei = (struct affs_inode_info *)kmem_cache_alloc(affs_inode_cachep, GFP_KERNEL); |
|
if (!ei) |
|
return NULL; |
|
ei->vfs_inode.i_version = 1; |
|
return &ei->vfs_inode; |
|
} |
|
|
|
static void affs_destroy_inode(struct inode *inode) |
|
{ |
|
kmem_cache_free(affs_inode_cachep, AFFS_I(inode)); |
|
} |
|
|
|
static void init_once(struct kmem_cache *cachep, void *foo) |
|
{ |
|
struct affs_inode_info *ei = (struct affs_inode_info *) foo; |
|
|
|
init_MUTEX(&ei->i_link_lock); |
|
init_MUTEX(&ei->i_ext_lock); |
|
inode_init_once(&ei->vfs_inode); |
|
} |
|
|
|
static int init_inodecache(void) |
|
{ |
|
affs_inode_cachep = kmem_cache_create("affs_inode_cache", |
|
sizeof(struct affs_inode_info), |
|
0, (SLAB_RECLAIM_ACCOUNT| |
|
SLAB_MEM_SPREAD), |
|
init_once); |
|
if (affs_inode_cachep == NULL) |
|
return -ENOMEM; |
|
return 0; |
|
} |
|
|
|
static void destroy_inodecache(void) |
|
{ |
|
kmem_cache_destroy(affs_inode_cachep); |
|
} |
|
|
|
static const struct super_operations affs_sops = { |
|
.alloc_inode = affs_alloc_inode, |
|
.destroy_inode = affs_destroy_inode, |
|
.write_inode = affs_write_inode, |
|
.put_inode = affs_put_inode, |
|
.drop_inode = affs_drop_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, |
|
}; |
|
|
|
enum { |
|
Opt_bs, Opt_mode, Opt_mufs, Opt_prefix, Opt_protect, |
|
Opt_reserved, Opt_root, Opt_setgid, Opt_setuid, |
|
Opt_verbose, Opt_volume, Opt_ignore, Opt_err, |
|
}; |
|
|
|
static match_table_t tokens = { |
|
{Opt_bs, "bs=%u"}, |
|
{Opt_mode, "mode=%o"}, |
|
{Opt_mufs, "mufs"}, |
|
{Opt_prefix, "prefix=%s"}, |
|
{Opt_protect, "protect"}, |
|
{Opt_reserved, "reserved=%u"}, |
|
{Opt_root, "root=%u"}, |
|
{Opt_setgid, "setgid=%u"}, |
|
{Opt_setuid, "setuid=%u"}, |
|
{Opt_verbose, "verbose"}, |
|
{Opt_volume, "volume=%s"}, |
|
{Opt_ignore, "grpquota"}, |
|
{Opt_ignore, "noquota"}, |
|
{Opt_ignore, "quota"}, |
|
{Opt_ignore, "usrquota"}, |
|
{Opt_err, NULL}, |
|
}; |
|
|
|
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 *p; |
|
substring_t args[MAX_OPT_ARGS]; |
|
|
|
/* 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; |
|
|
|
while ((p = strsep(&options, ",")) != NULL) { |
|
int token, n, option; |
|
if (!*p) |
|
continue; |
|
|
|
token = match_token(p, tokens, args); |
|
switch (token) { |
|
case Opt_bs: |
|
if (match_int(&args[0], &n)) |
|
return -EINVAL; |
|
if (n != 512 && n != 1024 && n != 2048 |
|
&& n != 4096) { |
|
printk ("AFFS: Invalid blocksize (512, 1024, 2048, 4096 allowed)\n"); |
|
return 0; |
|
} |
|
*blocksize = n; |
|
break; |
|
case Opt_mode: |
|
if (match_octal(&args[0], &option)) |
|
return 1; |
|
*mode = option & 0777; |
|
*mount_opts |= SF_SETMODE; |
|
break; |
|
case Opt_mufs: |
|
*mount_opts |= SF_MUFS; |
|
break; |
|
case Opt_prefix: |
|
/* Free any previous prefix */ |
|
kfree(*prefix); |
|
*prefix = NULL; |
|
*prefix = match_strdup(&args[0]); |
|
if (!*prefix) |
|
return 0; |
|
*mount_opts |= SF_PREFIX; |
|
break; |
|
case Opt_protect: |
|
*mount_opts |= SF_IMMUTABLE; |
|
break; |
|
case Opt_reserved: |
|
if (match_int(&args[0], reserved)) |
|
return 1; |
|
break; |
|
case Opt_root: |
|
if (match_int(&args[0], root)) |
|
return 1; |
|
break; |
|
case Opt_setgid: |
|
if (match_int(&args[0], &option)) |
|
return 1; |
|
*gid = option; |
|
*mount_opts |= SF_SETGID; |
|
break; |
|
case Opt_setuid: |
|
if (match_int(&args[0], &option)) |
|
return -EINVAL; |
|
*uid = option; |
|
*mount_opts |= SF_SETUID; |
|
break; |
|
case Opt_verbose: |
|
*mount_opts |= SF_VERBOSE; |
|
break; |
|
case Opt_volume: { |
|
char *vol = match_strdup(&args[0]); |
|
strlcpy(volume, vol, 32); |
|
kfree(vol); |
|
break; |
|
} |
|
case Opt_ignore: |
|
/* Silently ignore the quota options */ |
|
break; |
|
default: |
|
printk("AFFS: Unrecognized mount option \"%s\" " |
|
"or missing value\n", p); |
|
return 0; |
|
} |
|
} |
|
return 1; |
|
} |
|
|
|
/* 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 int affs_fill_super(struct super_block *sb, void *data, int silent) |
|
{ |
|
struct affs_sb_info *sbi; |
|
struct buffer_head *root_bh = NULL; |
|
struct buffer_head *boot_bh; |
|
struct inode *root_inode = NULL; |
|
s32 root_block; |
|
int size, blocksize; |
|
u32 chksum; |
|
int num_bm; |
|
int i, j; |
|
s32 key; |
|
uid_t uid; |
|
gid_t gid; |
|
int reserved; |
|
unsigned long mount_flags; |
|
int tmp_flags; /* fix remount prototype... */ |
|
u8 sig[4]; |
|
int ret = -EINVAL; |
|
|
|
pr_debug("AFFS: read_super(%s)\n",data ? (const char *)data : "no options"); |
|
|
|
sb->s_magic = AFFS_SUPER_MAGIC; |
|
sb->s_op = &affs_sops; |
|
sb->s_flags |= MS_NODIRATIME; |
|
|
|
sbi = kzalloc(sizeof(struct affs_sb_info), GFP_KERNEL); |
|
if (!sbi) |
|
return -ENOMEM; |
|
sb->s_fs_info = sbi; |
|
init_MUTEX(&sbi->s_bmlock); |
|
|
|
if (!parse_options(data,&uid,&gid,&i,&reserved,&root_block, |
|
&blocksize,&sbi->s_prefix, |
|
sbi->s_volume, &mount_flags)) { |
|
printk(KERN_ERR "AFFS: Error parsing options\n"); |
|
return -EINVAL; |
|
} |
|
/* N.B. after this point s_prefix must be released */ |
|
|
|
sbi->s_flags = mount_flags; |
|
sbi->s_mode = i; |
|
sbi->s_uid = uid; |
|
sbi->s_gid = gid; |
|
sbi->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. |
|
*/ |
|
|
|
size = sb->s_bdev->bd_inode->i_size >> 9; |
|
pr_debug("AFFS: initial blocksize=%d, #blocks=%d\n", 512, size); |
|
|
|
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) { |
|
sbi->s_root_block = root_block; |
|
if (root_block < 0) |
|
sbi->s_root_block = (reserved + size - 1) / 2; |
|
pr_debug("AFFS: setting blocksize to %d\n", blocksize); |
|
affs_set_blocksize(sb, blocksize); |
|
sbi->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", |
|
sb->s_id, |
|
sbi->s_root_block + num_bm, |
|
blocksize, size, reserved); |
|
root_bh = affs_bread(sb, sbi->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) { |
|
sbi->s_hashsize = blocksize / 4 - 56; |
|
sbi->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", |
|
sb->s_id); |
|
goto out_error; |
|
|
|
/* N.B. after this point bh must be released */ |
|
got_root: |
|
root_block = sbi->s_root_block; |
|
|
|
/* 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; |
|
} |
|
memcpy(sig, boot_bh->b_data, 4); |
|
brelse(boot_bh); |
|
chksum = be32_to_cpu(*(__be32 *)sig); |
|
|
|
/* 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", |
|
sb->s_id); |
|
sb->s_flags |= MS_RDONLY; |
|
} |
|
switch (chksum) { |
|
case MUFS_FS: |
|
case MUFS_INTLFFS: |
|
case MUFS_DCFFS: |
|
sbi->s_flags |= SF_MUFS; |
|
/* fall thru */ |
|
case FS_INTLFFS: |
|
case FS_DCFFS: |
|
sbi->s_flags |= SF_INTL; |
|
break; |
|
case MUFS_FFS: |
|
sbi->s_flags |= SF_MUFS; |
|
break; |
|
case FS_FFS: |
|
break; |
|
case MUFS_OFS: |
|
sbi->s_flags |= SF_MUFS; |
|
/* fall thru */ |
|
case FS_OFS: |
|
sbi->s_flags |= SF_OFS; |
|
sb->s_flags |= MS_NOEXEC; |
|
break; |
|
case MUFS_DCOFS: |
|
case MUFS_INTLOFS: |
|
sbi->s_flags |= SF_MUFS; |
|
case FS_DCOFS: |
|
case FS_INTLOFS: |
|
sbi->s_flags |= SF_INTL | SF_OFS; |
|
sb->s_flags |= MS_NOEXEC; |
|
break; |
|
default: |
|
printk(KERN_ERR "AFFS: Unknown filesystem on device %s: %08X\n", |
|
sb->s_id, chksum); |
|
goto out_error; |
|
} |
|
|
|
if (mount_flags & SF_VERBOSE) { |
|
u8 len = AFFS_ROOT_TAIL(sb, root_bh)->disk_name[0]; |
|
printk(KERN_NOTICE "AFFS: Mounting volume \"%.*s\": Type=%.3s\\%c, Blocksize=%d\n", |
|
len > 31 ? 31 : len, |
|
AFFS_ROOT_TAIL(sb, root_bh)->disk_name + 1, |
|
sig, sig[3] + '0', blocksize); |
|
} |
|
|
|
sb->s_flags |= MS_NODEV | MS_NOSUID; |
|
|
|
sbi->s_data_blksize = sb->s_blocksize; |
|
if (sbi->s_flags & SF_OFS) |
|
sbi->s_data_blksize -= 24; |
|
|
|
/* Keep super block in cache */ |
|
sbi->s_root_bh = root_bh; |
|
/* N.B. after this point s_root_bh must be released */ |
|
|
|
tmp_flags = sb->s_flags; |
|
if (affs_init_bitmap(sb, &tmp_flags)) |
|
goto out_error; |
|
sb->s_flags = tmp_flags; |
|
|
|
/* set up enough so that it can read an inode */ |
|
|
|
root_inode = affs_iget(sb, root_block); |
|
if (IS_ERR(root_inode)) { |
|
ret = PTR_ERR(root_inode); |
|
goto out_error_noinode; |
|
} |
|
|
|
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 0; |
|
|
|
/* |
|
* Begin the cascaded cleanup ... |
|
*/ |
|
out_error: |
|
if (root_inode) |
|
iput(root_inode); |
|
out_error_noinode: |
|
kfree(sbi->s_bitmap); |
|
affs_brelse(root_bh); |
|
kfree(sbi->s_prefix); |
|
kfree(sbi); |
|
sb->s_fs_info = NULL; |
|
return ret; |
|
} |
|
|
|
static int |
|
affs_remount(struct super_block *sb, int *flags, char *data) |
|
{ |
|
struct affs_sb_info *sbi = AFFS_SB(sb); |
|
int blocksize; |
|
uid_t uid; |
|
gid_t gid; |
|
int mode; |
|
int reserved; |
|
int root_block; |
|
unsigned long mount_flags; |
|
int res = 0; |
|
|
|
pr_debug("AFFS: remount(flags=0x%x,opts=\"%s\")\n",*flags,data); |
|
|
|
*flags |= MS_NODIRATIME; |
|
|
|
if (!parse_options(data,&uid,&gid,&mode,&reserved,&root_block, |
|
&blocksize,&sbi->s_prefix,sbi->s_volume,&mount_flags)) |
|
return -EINVAL; |
|
sbi->s_flags = mount_flags; |
|
sbi->s_mode = mode; |
|
sbi->s_uid = uid; |
|
sbi->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); |
|
affs_free_bitmap(sb); |
|
} else |
|
res = affs_init_bitmap(sb, flags); |
|
|
|
return res; |
|
} |
|
|
|
static int |
|
affs_statfs(struct dentry *dentry, struct kstatfs *buf) |
|
{ |
|
struct super_block *sb = dentry->d_sb; |
|
int free; |
|
|
|
pr_debug("AFFS: statfs() partsize=%d, reserved=%d\n",AFFS_SB(sb)->s_partition_size, |
|
AFFS_SB(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(sb)->s_partition_size - AFFS_SB(sb)->s_reserved; |
|
buf->f_bfree = free; |
|
buf->f_bavail = free; |
|
return 0; |
|
} |
|
|
|
static int affs_get_sb(struct file_system_type *fs_type, |
|
int flags, const char *dev_name, void *data, struct vfsmount *mnt) |
|
{ |
|
return get_sb_bdev(fs_type, flags, dev_name, data, affs_fill_super, |
|
mnt); |
|
} |
|
|
|
static struct file_system_type affs_fs_type = { |
|
.owner = THIS_MODULE, |
|
.name = "affs", |
|
.get_sb = affs_get_sb, |
|
.kill_sb = kill_block_super, |
|
.fs_flags = FS_REQUIRES_DEV, |
|
}; |
|
|
|
static int __init init_affs_fs(void) |
|
{ |
|
int err = init_inodecache(); |
|
if (err) |
|
goto out1; |
|
err = register_filesystem(&affs_fs_type); |
|
if (err) |
|
goto out; |
|
return 0; |
|
out: |
|
destroy_inodecache(); |
|
out1: |
|
return err; |
|
} |
|
|
|
static void __exit exit_affs_fs(void) |
|
{ |
|
unregister_filesystem(&affs_fs_type); |
|
destroy_inodecache(); |
|
} |
|
|
|
MODULE_DESCRIPTION("Amiga filesystem support for Linux"); |
|
MODULE_LICENSE("GPL"); |
|
|
|
module_init(init_affs_fs) |
|
module_exit(exit_affs_fs)
|
|
|