mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 09:19:51 +00:00
![Wolfram Sang](/assets/img/avatar_default.png)
Follow the advice of the below link and prefer 'strscpy' in this subsystem. Conversion is 1:1 because the return value is not used. Generated by a coccinelle script. Link: https://lore.kernel.org/r/CAHk-=wgfRnXz0W3D37d01q3JFkr_i_uTL=V6A6G1oUZcprmknw@mail.gmail.com/ Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
681 lines
17 KiB
C
681 lines
17 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* 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 <linux/cred.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/writeback.h>
|
|
#include <linux/blkdev.h>
|
|
#include <linux/seq_file.h>
|
|
#include <linux/iversion.h>
|
|
#include "affs.h"
|
|
|
|
static int affs_statfs(struct dentry *dentry, struct kstatfs *buf);
|
|
static int affs_show_options(struct seq_file *m, struct dentry *root);
|
|
static int affs_remount (struct super_block *sb, int *flags, char *data);
|
|
|
|
static void
|
|
affs_commit_super(struct super_block *sb, int wait)
|
|
{
|
|
struct affs_sb_info *sbi = AFFS_SB(sb);
|
|
struct buffer_head *bh = sbi->s_root_bh;
|
|
struct affs_root_tail *tail = AFFS_ROOT_TAIL(sb, bh);
|
|
|
|
lock_buffer(bh);
|
|
affs_secs_to_datestamp(ktime_get_real_seconds(), &tail->disk_change);
|
|
affs_fix_checksum(sb, bh);
|
|
unlock_buffer(bh);
|
|
|
|
mark_buffer_dirty(bh);
|
|
if (wait)
|
|
sync_dirty_buffer(bh);
|
|
}
|
|
|
|
static void
|
|
affs_put_super(struct super_block *sb)
|
|
{
|
|
struct affs_sb_info *sbi = AFFS_SB(sb);
|
|
pr_debug("%s()\n", __func__);
|
|
|
|
cancel_delayed_work_sync(&sbi->sb_work);
|
|
}
|
|
|
|
static int
|
|
affs_sync_fs(struct super_block *sb, int wait)
|
|
{
|
|
affs_commit_super(sb, wait);
|
|
return 0;
|
|
}
|
|
|
|
static void flush_superblock(struct work_struct *work)
|
|
{
|
|
struct affs_sb_info *sbi;
|
|
struct super_block *sb;
|
|
|
|
sbi = container_of(work, struct affs_sb_info, sb_work.work);
|
|
sb = sbi->sb;
|
|
|
|
spin_lock(&sbi->work_lock);
|
|
sbi->work_queued = 0;
|
|
spin_unlock(&sbi->work_lock);
|
|
|
|
affs_commit_super(sb, 1);
|
|
}
|
|
|
|
void affs_mark_sb_dirty(struct super_block *sb)
|
|
{
|
|
struct affs_sb_info *sbi = AFFS_SB(sb);
|
|
unsigned long delay;
|
|
|
|
if (sb_rdonly(sb))
|
|
return;
|
|
|
|
spin_lock(&sbi->work_lock);
|
|
if (!sbi->work_queued) {
|
|
delay = msecs_to_jiffies(dirty_writeback_interval * 10);
|
|
queue_delayed_work(system_long_wq, &sbi->sb_work, delay);
|
|
sbi->work_queued = 1;
|
|
}
|
|
spin_unlock(&sbi->work_lock);
|
|
}
|
|
|
|
static struct kmem_cache * affs_inode_cachep;
|
|
|
|
static struct inode *affs_alloc_inode(struct super_block *sb)
|
|
{
|
|
struct affs_inode_info *i;
|
|
|
|
i = alloc_inode_sb(sb, affs_inode_cachep, GFP_KERNEL);
|
|
if (!i)
|
|
return NULL;
|
|
|
|
inode_set_iversion(&i->vfs_inode, 1);
|
|
i->i_lc = NULL;
|
|
i->i_ext_bh = NULL;
|
|
i->i_pa_cnt = 0;
|
|
|
|
return &i->vfs_inode;
|
|
}
|
|
|
|
static void affs_free_inode(struct inode *inode)
|
|
{
|
|
kmem_cache_free(affs_inode_cachep, AFFS_I(inode));
|
|
}
|
|
|
|
static void init_once(void *foo)
|
|
{
|
|
struct affs_inode_info *ei = (struct affs_inode_info *) foo;
|
|
|
|
mutex_init(&ei->i_link_lock);
|
|
mutex_init(&ei->i_ext_lock);
|
|
inode_init_once(&ei->vfs_inode);
|
|
}
|
|
|
|
static int __init init_inodecache(void)
|
|
{
|
|
affs_inode_cachep = kmem_cache_create("affs_inode_cache",
|
|
sizeof(struct affs_inode_info),
|
|
0, (SLAB_RECLAIM_ACCOUNT|
|
|
SLAB_MEM_SPREAD|SLAB_ACCOUNT),
|
|
init_once);
|
|
if (affs_inode_cachep == NULL)
|
|
return -ENOMEM;
|
|
return 0;
|
|
}
|
|
|
|
static void destroy_inodecache(void)
|
|
{
|
|
/*
|
|
* Make sure all delayed rcu free inodes are flushed before we
|
|
* destroy cache.
|
|
*/
|
|
rcu_barrier();
|
|
kmem_cache_destroy(affs_inode_cachep);
|
|
}
|
|
|
|
static const struct super_operations affs_sops = {
|
|
.alloc_inode = affs_alloc_inode,
|
|
.free_inode = affs_free_inode,
|
|
.write_inode = affs_write_inode,
|
|
.evict_inode = affs_evict_inode,
|
|
.put_super = affs_put_super,
|
|
.sync_fs = affs_sync_fs,
|
|
.statfs = affs_statfs,
|
|
.remount_fs = affs_remount,
|
|
.show_options = affs_show_options,
|
|
};
|
|
|
|
enum {
|
|
Opt_bs, Opt_mode, Opt_mufs, Opt_notruncate, Opt_prefix, Opt_protect,
|
|
Opt_reserved, Opt_root, Opt_setgid, Opt_setuid,
|
|
Opt_verbose, Opt_volume, Opt_ignore, Opt_err,
|
|
};
|
|
|
|
static const match_table_t tokens = {
|
|
{Opt_bs, "bs=%u"},
|
|
{Opt_mode, "mode=%o"},
|
|
{Opt_mufs, "mufs"},
|
|
{Opt_notruncate, "nofilenametruncate"},
|
|
{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, kuid_t *uid, kgid_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 0;
|
|
if (n != 512 && n != 1024 && n != 2048
|
|
&& n != 4096) {
|
|
pr_warn("Invalid blocksize (512, 1024, 2048, 4096 allowed)\n");
|
|
return 0;
|
|
}
|
|
*blocksize = n;
|
|
break;
|
|
case Opt_mode:
|
|
if (match_octal(&args[0], &option))
|
|
return 0;
|
|
*mode = option & 0777;
|
|
affs_set_opt(*mount_opts, SF_SETMODE);
|
|
break;
|
|
case Opt_mufs:
|
|
affs_set_opt(*mount_opts, SF_MUFS);
|
|
break;
|
|
case Opt_notruncate:
|
|
affs_set_opt(*mount_opts, SF_NO_TRUNCATE);
|
|
break;
|
|
case Opt_prefix:
|
|
kfree(*prefix);
|
|
*prefix = match_strdup(&args[0]);
|
|
if (!*prefix)
|
|
return 0;
|
|
affs_set_opt(*mount_opts, SF_PREFIX);
|
|
break;
|
|
case Opt_protect:
|
|
affs_set_opt(*mount_opts, SF_IMMUTABLE);
|
|
break;
|
|
case Opt_reserved:
|
|
if (match_int(&args[0], reserved))
|
|
return 0;
|
|
break;
|
|
case Opt_root:
|
|
if (match_int(&args[0], root))
|
|
return 0;
|
|
break;
|
|
case Opt_setgid:
|
|
if (match_int(&args[0], &option))
|
|
return 0;
|
|
*gid = make_kgid(current_user_ns(), option);
|
|
if (!gid_valid(*gid))
|
|
return 0;
|
|
affs_set_opt(*mount_opts, SF_SETGID);
|
|
break;
|
|
case Opt_setuid:
|
|
if (match_int(&args[0], &option))
|
|
return 0;
|
|
*uid = make_kuid(current_user_ns(), option);
|
|
if (!uid_valid(*uid))
|
|
return 0;
|
|
affs_set_opt(*mount_opts, SF_SETUID);
|
|
break;
|
|
case Opt_verbose:
|
|
affs_set_opt(*mount_opts, SF_VERBOSE);
|
|
break;
|
|
case Opt_volume: {
|
|
char *vol = match_strdup(&args[0]);
|
|
if (!vol)
|
|
return 0;
|
|
strscpy(volume, vol, 32);
|
|
kfree(vol);
|
|
break;
|
|
}
|
|
case Opt_ignore:
|
|
/* Silently ignore the quota options */
|
|
break;
|
|
default:
|
|
pr_warn("Unrecognized mount option \"%s\" or missing value\n",
|
|
p);
|
|
return 0;
|
|
}
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
static int affs_show_options(struct seq_file *m, struct dentry *root)
|
|
{
|
|
struct super_block *sb = root->d_sb;
|
|
struct affs_sb_info *sbi = AFFS_SB(sb);
|
|
|
|
if (sb->s_blocksize)
|
|
seq_printf(m, ",bs=%lu", sb->s_blocksize);
|
|
if (affs_test_opt(sbi->s_flags, SF_SETMODE))
|
|
seq_printf(m, ",mode=%o", sbi->s_mode);
|
|
if (affs_test_opt(sbi->s_flags, SF_MUFS))
|
|
seq_puts(m, ",mufs");
|
|
if (affs_test_opt(sbi->s_flags, SF_NO_TRUNCATE))
|
|
seq_puts(m, ",nofilenametruncate");
|
|
if (affs_test_opt(sbi->s_flags, SF_PREFIX))
|
|
seq_printf(m, ",prefix=%s", sbi->s_prefix);
|
|
if (affs_test_opt(sbi->s_flags, SF_IMMUTABLE))
|
|
seq_puts(m, ",protect");
|
|
if (sbi->s_reserved != 2)
|
|
seq_printf(m, ",reserved=%u", sbi->s_reserved);
|
|
if (sbi->s_root_block != (sbi->s_reserved + sbi->s_partition_size - 1) / 2)
|
|
seq_printf(m, ",root=%u", sbi->s_root_block);
|
|
if (affs_test_opt(sbi->s_flags, SF_SETGID))
|
|
seq_printf(m, ",setgid=%u",
|
|
from_kgid_munged(&init_user_ns, sbi->s_gid));
|
|
if (affs_test_opt(sbi->s_flags, SF_SETUID))
|
|
seq_printf(m, ",setuid=%u",
|
|
from_kuid_munged(&init_user_ns, sbi->s_uid));
|
|
if (affs_test_opt(sbi->s_flags, SF_VERBOSE))
|
|
seq_puts(m, ",verbose");
|
|
if (sbi->s_volume[0])
|
|
seq_printf(m, ",volume=%s", sbi->s_volume);
|
|
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 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;
|
|
kuid_t uid;
|
|
kgid_t gid;
|
|
int reserved;
|
|
unsigned long mount_flags;
|
|
int tmp_flags; /* fix remount prototype... */
|
|
u8 sig[4];
|
|
int ret;
|
|
|
|
pr_debug("read_super(%s)\n", data ? (const char *)data : "no options");
|
|
|
|
sb->s_magic = AFFS_SUPER_MAGIC;
|
|
sb->s_op = &affs_sops;
|
|
sb->s_flags |= SB_NODIRATIME;
|
|
|
|
sb->s_time_gran = NSEC_PER_SEC;
|
|
sb->s_time_min = sys_tz.tz_minuteswest * 60 + AFFS_EPOCH_DELTA;
|
|
sb->s_time_max = 86400LL * U32_MAX + 86400 + sb->s_time_min;
|
|
|
|
sbi = kzalloc(sizeof(struct affs_sb_info), GFP_KERNEL);
|
|
if (!sbi)
|
|
return -ENOMEM;
|
|
|
|
sb->s_fs_info = sbi;
|
|
sbi->sb = sb;
|
|
mutex_init(&sbi->s_bmlock);
|
|
spin_lock_init(&sbi->symlink_lock);
|
|
spin_lock_init(&sbi->work_lock);
|
|
INIT_DELAYED_WORK(&sbi->sb_work, flush_superblock);
|
|
|
|
if (!parse_options(data,&uid,&gid,&i,&reserved,&root_block,
|
|
&blocksize,&sbi->s_prefix,
|
|
sbi->s_volume, &mount_flags)) {
|
|
pr_err("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 = bdev_nr_sectors(sb->s_bdev);
|
|
pr_debug("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 = bdev_logical_block_size(sb->s_bdev);
|
|
j = PAGE_SIZE;
|
|
if (blocksize > 0) {
|
|
i = j = blocksize;
|
|
size = size / (blocksize / 512);
|
|
}
|
|
|
|
for (blocksize = i; 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("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("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;
|
|
goto got_root;
|
|
}
|
|
affs_brelse(root_bh);
|
|
root_bh = NULL;
|
|
}
|
|
}
|
|
if (!silent)
|
|
pr_err("No valid root block on device %s\n", sb->s_id);
|
|
return -EINVAL;
|
|
|
|
/* N.B. after this point bh must be released */
|
|
got_root:
|
|
/* Keep super block in cache */
|
|
sbi->s_root_bh = root_bh;
|
|
root_block = sbi->s_root_block;
|
|
|
|
/* Find out which kind of FS we have */
|
|
boot_bh = sb_bread(sb, 0);
|
|
if (!boot_bh) {
|
|
pr_err("Cannot read boot block\n");
|
|
return -EINVAL;
|
|
}
|
|
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_rdonly(sb)) {
|
|
pr_notice("Dircache FS - mounting %s read only\n", sb->s_id);
|
|
sb->s_flags |= SB_RDONLY;
|
|
}
|
|
switch (chksum) {
|
|
case MUFS_FS:
|
|
case MUFS_INTLFFS:
|
|
case MUFS_DCFFS:
|
|
affs_set_opt(sbi->s_flags, SF_MUFS);
|
|
fallthrough;
|
|
case FS_INTLFFS:
|
|
case FS_DCFFS:
|
|
affs_set_opt(sbi->s_flags, SF_INTL);
|
|
break;
|
|
case MUFS_FFS:
|
|
affs_set_opt(sbi->s_flags, SF_MUFS);
|
|
break;
|
|
case FS_FFS:
|
|
break;
|
|
case MUFS_OFS:
|
|
affs_set_opt(sbi->s_flags, SF_MUFS);
|
|
fallthrough;
|
|
case FS_OFS:
|
|
affs_set_opt(sbi->s_flags, SF_OFS);
|
|
sb->s_flags |= SB_NOEXEC;
|
|
break;
|
|
case MUFS_DCOFS:
|
|
case MUFS_INTLOFS:
|
|
affs_set_opt(sbi->s_flags, SF_MUFS);
|
|
fallthrough;
|
|
case FS_DCOFS:
|
|
case FS_INTLOFS:
|
|
affs_set_opt(sbi->s_flags, SF_INTL);
|
|
affs_set_opt(sbi->s_flags, SF_OFS);
|
|
sb->s_flags |= SB_NOEXEC;
|
|
break;
|
|
default:
|
|
pr_err("Unknown filesystem on device %s: %08X\n",
|
|
sb->s_id, chksum);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (affs_test_opt(mount_flags, SF_VERBOSE)) {
|
|
u8 len = AFFS_ROOT_TAIL(sb, root_bh)->disk_name[0];
|
|
pr_notice("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 |= SB_NODEV | SB_NOSUID;
|
|
|
|
sbi->s_data_blksize = sb->s_blocksize;
|
|
if (affs_test_opt(sbi->s_flags, SF_OFS))
|
|
sbi->s_data_blksize -= 24;
|
|
|
|
tmp_flags = sb->s_flags;
|
|
ret = affs_init_bitmap(sb, &tmp_flags);
|
|
if (ret)
|
|
return ret;
|
|
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))
|
|
return PTR_ERR(root_inode);
|
|
|
|
if (affs_test_opt(AFFS_SB(sb)->s_flags, SF_INTL))
|
|
sb->s_d_op = &affs_intl_dentry_operations;
|
|
else
|
|
sb->s_d_op = &affs_dentry_operations;
|
|
|
|
sb->s_root = d_make_root(root_inode);
|
|
if (!sb->s_root) {
|
|
pr_err("AFFS: Get root inode failed\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
sb->s_export_op = &affs_export_ops;
|
|
pr_debug("s_flags=%lX\n", sb->s_flags);
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
affs_remount(struct super_block *sb, int *flags, char *data)
|
|
{
|
|
struct affs_sb_info *sbi = AFFS_SB(sb);
|
|
int blocksize;
|
|
kuid_t uid;
|
|
kgid_t gid;
|
|
int mode;
|
|
int reserved;
|
|
int root_block;
|
|
unsigned long mount_flags;
|
|
int res = 0;
|
|
char volume[32];
|
|
char *prefix = NULL;
|
|
|
|
pr_debug("%s(flags=0x%x,opts=\"%s\")\n", __func__, *flags, data);
|
|
|
|
sync_filesystem(sb);
|
|
*flags |= SB_NODIRATIME;
|
|
|
|
memcpy(volume, sbi->s_volume, 32);
|
|
if (!parse_options(data, &uid, &gid, &mode, &reserved, &root_block,
|
|
&blocksize, &prefix, volume,
|
|
&mount_flags)) {
|
|
kfree(prefix);
|
|
return -EINVAL;
|
|
}
|
|
|
|
flush_delayed_work(&sbi->sb_work);
|
|
|
|
sbi->s_flags = mount_flags;
|
|
sbi->s_mode = mode;
|
|
sbi->s_uid = uid;
|
|
sbi->s_gid = gid;
|
|
/* protect against readers */
|
|
spin_lock(&sbi->symlink_lock);
|
|
if (prefix) {
|
|
kfree(sbi->s_prefix);
|
|
sbi->s_prefix = prefix;
|
|
}
|
|
memcpy(sbi->s_volume, volume, 32);
|
|
spin_unlock(&sbi->symlink_lock);
|
|
|
|
if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb))
|
|
return 0;
|
|
|
|
if (*flags & SB_RDONLY)
|
|
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;
|
|
u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
|
|
|
|
pr_debug("%s() partsize=%d, reserved=%d\n",
|
|
__func__, 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;
|
|
buf->f_fsid = u64_to_fsid(id);
|
|
buf->f_namelen = AFFSNAMEMAX;
|
|
return 0;
|
|
}
|
|
|
|
static struct dentry *affs_mount(struct file_system_type *fs_type,
|
|
int flags, const char *dev_name, void *data)
|
|
{
|
|
return mount_bdev(fs_type, flags, dev_name, data, affs_fill_super);
|
|
}
|
|
|
|
static void affs_kill_sb(struct super_block *sb)
|
|
{
|
|
struct affs_sb_info *sbi = AFFS_SB(sb);
|
|
kill_block_super(sb);
|
|
if (sbi) {
|
|
affs_free_bitmap(sb);
|
|
affs_brelse(sbi->s_root_bh);
|
|
kfree(sbi->s_prefix);
|
|
mutex_destroy(&sbi->s_bmlock);
|
|
kfree(sbi);
|
|
}
|
|
}
|
|
|
|
static struct file_system_type affs_fs_type = {
|
|
.owner = THIS_MODULE,
|
|
.name = "affs",
|
|
.mount = affs_mount,
|
|
.kill_sb = affs_kill_sb,
|
|
.fs_flags = FS_REQUIRES_DEV,
|
|
};
|
|
MODULE_ALIAS_FS("affs");
|
|
|
|
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)
|