int
affs_notify_change(struct dentry *dentry, struct iattr *attr)
{
struct inode *inode = dentry->d_inode;
int error;
pr_debug("AFFS: notify_change(%lu,0x%x)\n",inode->i_ino,attr->ia_valid);
error = inode_change_ok(inode,attr);
if (error)
goto out;
if (((attr->ia_valid & ATTR_UID) && (AFFS_SB(inode->i_sb)->s_flags & SF_SETUID)) ||
((attr->ia_valid & ATTR_GID) && (AFFS_SB(inode->i_sb)->s_flags & SF_SETGID)) ||
((attr->ia_valid & ATTR_MODE) &&
(AFFS_SB(inode->i_sb)->s_flags & (SF_SETMODE | SF_IMMUTABLE)))) {
if (!(AFFS_SB(inode->i_sb)->s_flags & SF_QUIET))
error = -EPERM;
goto out;
}
error = inode_setattr(inode, attr);
if (!error && (attr->ia_valid & ATTR_MODE))
mode_to_prot(inode);
out:
return error;
}
static int affs_symlink_readpage(struct file *file, struct page *page)
{
struct buffer_head *bh;
struct inode *inode = page->mapping->host;
char *link = kmap(page);
struct slink_front *lf;
int err;
int i, j;
char c;
char lc;
char *pf;
pr_debug("AFFS: follow_link(ino=%lu)\n",inode->i_ino);
err = -EIO;
bh = affs_bread(inode->i_sb, inode->i_ino);
if (!bh)
goto fail;
i = 0;
j = 0;
lf = (struct slink_front *)bh->b_data;
lc = 0;
pf = AFFS_SB(inode->i_sb)->s_prefix ? AFFS_SB(inode->i_sb)->s_prefix : "/";
if (strchr(lf->symname,':')) { /* Handle assign or volume name */
while (i < 1023 && (c = pf[i]))
link[i++] = c;
while (i < 1023 && lf->symname[j] != ':')
link[i++] = lf->symname[j++];
if (i < 1023)
link[i++] = '/';
j++;
lc = '/';
}
while (i < 1023 && (c = lf->symname[j])) {
if (c == '/' && lc == '/' && i < 1020) { /* parent dir */
link[i++] = '.';
link[i++] = '.';
}
link[i++] = c;
lc = c;
j++;
}
link[i] = '\0';
affs_brelse(bh);
SetPageUptodate(page);
kunmap(page);
unlock_page(page);
return 0;
fail:
SetPageError(page);
kunmap(page);
unlock_page(page);
return err;
}
int
affs_write_inode(struct inode *inode, struct writeback_control *wbc)
{
struct super_block *sb = inode->i_sb;
struct buffer_head *bh;
struct affs_tail *tail;
uid_t uid;
gid_t gid;
pr_debug("write_inode(%lu)\n", inode->i_ino);
if (!inode->i_nlink)
// possibly free block
return 0;
bh = affs_bread(sb, inode->i_ino);
if (!bh) {
affs_error(sb,"write_inode","Cannot read block %lu",inode->i_ino);
return -EIO;
}
tail = AFFS_TAIL(sb, bh);
if (tail->stype == cpu_to_be32(ST_ROOT)) {
affs_secs_to_datestamp(inode->i_mtime.tv_sec,
&AFFS_ROOT_TAIL(sb, bh)->root_change);
} else {
tail->protect = cpu_to_be32(AFFS_I(inode)->i_protect);
tail->size = cpu_to_be32(inode->i_size);
affs_secs_to_datestamp(inode->i_mtime.tv_sec, &tail->change);
if (!(inode->i_ino == AFFS_SB(sb)->s_root_block)) {
uid = i_uid_read(inode);
gid = i_gid_read(inode);
if (affs_test_opt(AFFS_SB(sb)->s_flags, SF_MUFS)) {
if (uid == 0 || uid == 0xFFFF)
uid = uid ^ ~0;
if (gid == 0 || gid == 0xFFFF)
gid = gid ^ ~0;
}
if (!affs_test_opt(AFFS_SB(sb)->s_flags, SF_SETUID))
tail->uid = cpu_to_be16(uid);
if (!affs_test_opt(AFFS_SB(sb)->s_flags, SF_SETGID))
tail->gid = cpu_to_be16(gid);
}
}
affs_fix_checksum(sb, bh);
mark_buffer_dirty_inode(bh, inode);
affs_brelse(bh);
affs_free_prealloc(inode);
return 0;
}
static int
affs_statfs(struct super_block *sb, struct kstatfs *buf)
{
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;
}
struct dentry *
affs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
{
struct super_block *sb = dir->i_sb;
struct buffer_head *bh;
struct inode *inode = NULL;
pr_debug("AFFS: lookup(\"%.*s\")\n",(int)dentry->d_name.len,dentry->d_name.name);
affs_lock_dir(dir);
bh = affs_find_entry(dir, dentry);
affs_unlock_dir(dir);
if (IS_ERR(bh))
return ERR_CAST(bh);
if (bh) {
u32 ino = bh->b_blocknr;
/* store the real header ino in d_fsdata for faster lookups */
dentry->d_fsdata = (void *)(long)ino;
switch (be32_to_cpu(AFFS_TAIL(sb, bh)->stype)) {
//link to dirs disabled
//case ST_LINKDIR:
case ST_LINKFILE:
ino = be32_to_cpu(AFFS_TAIL(sb, bh)->original);
}
affs_brelse(bh);
inode = affs_iget(sb, ino);
if (IS_ERR(inode))
return ERR_PTR(PTR_ERR(inode));
}
dentry->d_op = AFFS_SB(sb)->s_flags & SF_INTL ? &affs_intl_dentry_operations : &affs_dentry_operations;
d_add(dentry, inode);
return NULL;
}
int
affs_create(struct inode *dir, struct dentry *dentry, umode_t mode, bool excl)
{
struct super_block *sb = dir->i_sb;
struct inode *inode;
int error;
pr_debug("%s(%lu,\"%pd\",0%ho)\n",
__func__, dir->i_ino, dentry, mode);
inode = affs_new_inode(dir);
if (!inode)
return -ENOSPC;
inode->i_mode = mode;
mode_to_prot(inode);
mark_inode_dirty(inode);
inode->i_op = &affs_file_inode_operations;
inode->i_fop = &affs_file_operations;
inode->i_mapping->a_ops = (AFFS_SB(sb)->s_flags & SF_OFS) ? &affs_aops_ofs : &affs_aops;
error = affs_add_entry(dir, inode, dentry, ST_FILE);
if (error) {
clear_nlink(inode);
iput(inode);
return error;
}
return 0;
}
int
affs_create(struct inode *dir, struct dentry *dentry, int mode, struct nameidata *nd)
{
struct super_block *sb = dir->i_sb;
struct inode *inode;
int error;
pr_debug("AFFS: create(%lu,\"%.*s\",0%o)\n",dir->i_ino,(int)dentry->d_name.len,
dentry->d_name.name,mode);
inode = affs_new_inode(dir);
if (!inode)
return -ENOSPC;
inode->i_mode = mode;
mode_to_prot(inode);
mark_inode_dirty(inode);
inode->i_op = &affs_file_inode_operations;
inode->i_fop = &affs_file_operations;
inode->i_mapping->a_ops = (AFFS_SB(sb)->s_flags & SF_OFS) ? &affs_aops_ofs : &affs_aops;
error = affs_add_entry(dir, inode, dentry, ST_FILE);
if (error) {
inode->i_nlink = 0;
iput(inode);
return error;
}
return 0;
}
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;
char *new_opts = kstrdup(data, GFP_KERNEL);
char volume[32];
char *prefix = NULL;
pr_debug("AFFS: remount(flags=0x%x,opts=\"%s\")\n",*flags,data);
*flags |= MS_NODIRATIME;
memcpy(volume, sbi->s_volume, 32);
if (!parse_options(data, &uid, &gid, &mode, &reserved, &root_block,
&blocksize, &prefix, volume,
&mount_flags)) {
kfree(prefix);
kfree(new_opts);
return -EINVAL;
}
lock_kernel();
replace_mount_options(sb, new_opts);
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 ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) {
unlock_kernel();
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);
unlock_kernel();
return res;
}
static void
affs_put_super(struct super_block *sb)
{
struct affs_sb_info *sbi = AFFS_SB(sb);
pr_debug("AFFS: put_super()\n");
cancel_delayed_work_sync(&sbi->sb_work);
}
int
affs_notify_change(struct dentry *dentry, struct iattr *attr)
{
struct inode *inode = d_inode(dentry);
int error;
pr_debug("notify_change(%lu,0x%x)\n", inode->i_ino, attr->ia_valid);
error = setattr_prepare(dentry, attr);
if (error)
goto out;
if (((attr->ia_valid & ATTR_UID) &&
affs_test_opt(AFFS_SB(inode->i_sb)->s_flags, SF_SETUID)) ||
((attr->ia_valid & ATTR_GID) &&
affs_test_opt(AFFS_SB(inode->i_sb)->s_flags, SF_SETGID)) ||
((attr->ia_valid & ATTR_MODE) &&
(AFFS_SB(inode->i_sb)->s_flags &
(AFFS_MOUNT_SF_SETMODE | AFFS_MOUNT_SF_IMMUTABLE)))) {
if (!affs_test_opt(AFFS_SB(inode->i_sb)->s_flags, SF_QUIET))
error = -EPERM;
goto out;
}
if ((attr->ia_valid & ATTR_SIZE) &&
attr->ia_size != i_size_read(inode)) {
error = inode_newsize_ok(inode, attr->ia_size);
if (error)
return error;
truncate_setsize(inode, attr->ia_size);
affs_truncate(inode);
}
setattr_copy(inode, attr);
mark_inode_dirty(inode);
if (attr->ia_valid & ATTR_MODE)
affs_mode_to_prot(inode);
out:
return error;
}
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);
kfree(sbi);
}
}
int
affs_hash_name(struct super_block *sb, const u8 *name, unsigned int len)
{
toupper_t toupper = affs_get_toupper(sb);
int hash;
hash = len = min(len, 30u);
for (; len > 0; len--)
hash = (hash * 13 + toupper(*name++)) & 0x7ff;
return hash % AFFS_SB(sb)->s_hashsize;
}
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("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;
buf->f_fsid.val[0] = (u32)id;
buf->f_fsid.val[1] = (u32)(id >> 32);
buf->f_namelen = 30;
return 0;
}
static void
affs_commit_super(struct super_block *sb, int clean)
{
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);
tail->bm_flag = cpu_to_be32(clean);
secs_to_datestamp(get_seconds(), &tail->disk_change);
affs_fix_checksum(sb, bh);
mark_buffer_dirty(bh);
}
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) && sb->s_dirt)
affs_commit_super(sb, 1, 1);
kfree(sbi->s_prefix);
affs_free_bitmap(sb);
affs_brelse(sbi->s_root_bh);
kfree(sbi);
sb->s_fs_info = NULL;
}
int
affs_notify_change(struct dentry *dentry, struct iattr *attr)
{
struct inode *inode = dentry->d_inode;
int error;
pr_debug("AFFS: notify_change(%lu,0x%x)\n",inode->i_ino,attr->ia_valid);
error = inode_change_ok(inode,attr);
if (error)
goto out;
if (((attr->ia_valid & ATTR_UID) && (AFFS_SB(inode->i_sb)->s_flags & SF_SETUID)) ||
((attr->ia_valid & ATTR_GID) && (AFFS_SB(inode->i_sb)->s_flags & SF_SETGID)) ||
((attr->ia_valid & ATTR_MODE) &&
(AFFS_SB(inode->i_sb)->s_flags & (SF_SETMODE | SF_IMMUTABLE)))) {
if (!(AFFS_SB(inode->i_sb)->s_flags & SF_QUIET))
error = -EPERM;
goto out;
}
if ((attr->ia_valid & ATTR_SIZE) &&
attr->ia_size != i_size_read(inode)) {
error = vmtruncate(inode, attr->ia_size);
if (error)
return error;
}
setattr_copy(inode, attr);
mark_inode_dirty(inode);
if (attr->ia_valid & ATTR_MODE)
mode_to_prot(inode);
out:
return error;
}
void affs_mark_sb_dirty(struct super_block *sb)
{
struct affs_sb_info *sbi = AFFS_SB(sb);
unsigned long delay;
if (sb->s_flags & MS_RDONLY)
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 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);
secs_to_datestamp(get_seconds(), &tail->disk_change);
affs_fix_checksum(sb, bh);
unlock_buffer(bh);
mark_buffer_dirty(bh);
if (wait)
sync_dirty_buffer(bh);
}
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;
char *new_opts = kstrdup(data, GFP_KERNEL);
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)) {
kfree(new_opts);
return -EINVAL;
}
kfree(sb->s_options);
sb->s_options = new_opts;
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 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 int
affs_empty_dir(struct inode *inode)
{
struct super_block *sb = inode->i_sb;
struct buffer_head *bh;
int retval, size;
retval = -EIO;
bh = affs_bread(sb, inode->i_ino);
if (!bh)
goto done;
retval = -ENOTEMPTY;
for (size = AFFS_SB(sb)->s_hashsize - 1; size >= 0; size--)
if (AFFS_HEAD(bh)->table[size])
goto not_empty;
retval = 0;
not_empty:
affs_brelse(bh);
done:
return retval;
}
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;
unsigned long read_only = sbi->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,&sbi->s_prefix,sbi->s_volume,&mount_flags))
return -EINVAL;
sbi->s_flags = mount_flags | read_only;
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);
sb->s_flags |= MS_RDONLY;
} else if (!(sbi->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_readdir(struct file *file, struct dir_context *ctx)
{
struct inode *inode = file_inode(file);
struct super_block *sb = inode->i_sb;
struct buffer_head *dir_bh = NULL;
struct buffer_head *fh_bh = NULL;
unsigned char *name;
int namelen;
u32 i;
int hash_pos;
int chain_pos;
u32 ino;
int error = 0;
pr_debug("%s(ino=%lu,f_pos=%llx)\n", __func__, inode->i_ino, ctx->pos);
if (ctx->pos < 2) {
file->private_data = (void *)0;
if (!dir_emit_dots(file, ctx))
return 0;
}
affs_lock_dir(inode);
chain_pos = (ctx->pos - 2) & 0xffff;
hash_pos = (ctx->pos - 2) >> 16;
if (chain_pos == 0xffff) {
affs_warning(sb, "readdir", "More than 65535 entries in chain");
chain_pos = 0;
hash_pos++;
ctx->pos = ((hash_pos << 16) | chain_pos) + 2;
}
dir_bh = affs_bread(sb, inode->i_ino);
if (!dir_bh)
goto out_unlock_dir;
/* If the directory hasn't changed since the last call to readdir(),
* we can jump directly to where we left off.
*/
ino = (u32)(long)file->private_data;
if (ino && file->f_version == inode->i_version) {
pr_debug("readdir() left off=%d\n", ino);
goto inside;
}
ino = be32_to_cpu(AFFS_HEAD(dir_bh)->table[hash_pos]);
for (i = 0; ino && i < chain_pos; i++) {
fh_bh = affs_bread(sb, ino);
if (!fh_bh) {
affs_error(sb, "readdir","Cannot read block %d", i);
error = -EIO;
goto out_brelse_dir;
}
ino = be32_to_cpu(AFFS_TAIL(sb, fh_bh)->hash_chain);
affs_brelse(fh_bh);
fh_bh = NULL;
}
if (ino)
goto inside;
hash_pos++;
for (; hash_pos < AFFS_SB(sb)->s_hashsize; hash_pos++) {
ino = be32_to_cpu(AFFS_HEAD(dir_bh)->table[hash_pos]);
if (!ino)
continue;
ctx->pos = (hash_pos << 16) + 2;
inside:
do {
fh_bh = affs_bread(sb, ino);
if (!fh_bh) {
affs_error(sb, "readdir",
"Cannot read block %d", ino);
break;
}
namelen = min(AFFS_TAIL(sb, fh_bh)->name[0],
(u8)AFFSNAMEMAX);
name = AFFS_TAIL(sb, fh_bh)->name + 1;
pr_debug("readdir(): dir_emit(\"%.*s\", ino=%u), hash=%d, f_pos=%llx\n",
namelen, name, ino, hash_pos, ctx->pos);
if (!dir_emit(ctx, name, namelen, ino, DT_UNKNOWN))
goto done;
ctx->pos++;
ino = be32_to_cpu(AFFS_TAIL(sb, fh_bh)->hash_chain);
affs_brelse(fh_bh);
fh_bh = NULL;
} while (ino);
}
done:
file->f_version = inode->i_version;
file->private_data = (void *)(long)ino;
affs_brelse(fh_bh);
out_brelse_dir:
affs_brelse(dir_bh);
out_unlock_dir:
affs_unlock_dir(inode);
return error;
}
static inline toupper_t
affs_get_toupper(struct super_block *sb)
{
return affs_test_opt(AFFS_SB(sb)->s_flags, SF_INTL) ?
affs_intl_toupper : affs_toupper;
}
static inline toupper_t
affs_get_toupper(struct super_block *sb)
{
return AFFS_SB(sb)->s_flags & SF_INTL ? affs_intl_toupper : affs_toupper;
}
int
affs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
{
struct super_block *sb = dir->i_sb;
struct buffer_head *bh;
struct inode *inode;
char *p;
int i, maxlen, error;
char c, lc;
pr_debug("AFFS: symlink(%lu,\"%.*s\" -> \"%s\")\n",dir->i_ino,
(int)dentry->d_name.len,dentry->d_name.name,symname);
maxlen = AFFS_SB(sb)->s_hashsize * sizeof(u32) - 1;
inode = affs_new_inode(dir);
if (!inode)
return -ENOSPC;
inode->i_op = &affs_symlink_inode_operations;
inode->i_data.a_ops = &affs_symlink_aops;
inode->i_mode = S_IFLNK | 0777;
mode_to_prot(inode);
error = -EIO;
bh = affs_bread(sb, inode->i_ino);
if (!bh)
goto err;
i = 0;
p = (char *)AFFS_HEAD(bh)->table;
lc = '/';
if (*symname == '/') {
struct affs_sb_info *sbi = AFFS_SB(sb);
while (*symname == '/')
symname++;
spin_lock(&sbi->symlink_lock);
while (sbi->s_volume[i]) /* Cannot overflow */
*p++ = sbi->s_volume[i++];
spin_unlock(&sbi->symlink_lock);
}
while (i < maxlen && (c = *symname++)) {
if (c == '.' && lc == '/' && *symname == '.' && symname[1] == '/') {
*p++ = '/';
i++;
symname += 2;
lc = '/';
} else if (c == '.' && lc == '/' && *symname == '/') {
symname++;
lc = '/';
} else {
*p++ = c;
lc = c;
i++;
}
if (lc == '/')
while (*symname == '/')
symname++;
}
*p = 0;
mark_buffer_dirty_inode(bh, inode);
affs_brelse(bh);
mark_inode_dirty(inode);
error = affs_add_entry(dir, inode, dentry, ST_SOFTLINK);
if (error)
goto err;
return 0;
err:
inode->i_nlink = 0;
mark_inode_dirty(inode);
iput(inode);
return error;
}
struct inode *affs_iget(struct super_block *sb, unsigned long ino)
{
struct affs_sb_info *sbi = AFFS_SB(sb);
struct buffer_head *bh;
// struct affs_head *head;
struct affs_tail *tail;
struct inode *inode;
u32 block;
u32 size;
u32 prot;
u16 id;
inode = iget_locked(sb, ino);
if (!inode)
return ERR_PTR(-ENOMEM);
if (!(inode->i_state & I_NEW))
return inode;
pr_debug("AFFS: affs_iget(%lu)\n", inode->i_ino);
block = inode->i_ino;
bh = affs_bread(sb, block);
if (!bh) {
affs_warning(sb, "read_inode", "Cannot read block %d", block);
goto bad_inode;
}
if (affs_checksum_block(sb, bh) || be32_to_cpu(AFFS_HEAD(bh)->ptype) != T_SHORT) {
affs_warning(sb,"read_inode",
"Checksum or type (ptype=%d) error on inode %d",
AFFS_HEAD(bh)->ptype, block);
goto bad_inode;
}
// head = AFFS_HEAD(bh);
tail = AFFS_TAIL(sb, bh);
prot = be32_to_cpu(tail->protect);
inode->i_size = 0;
inode->i_nlink = 1;
inode->i_mode = 0;
AFFS_I(inode)->i_extcnt = 1;
AFFS_I(inode)->i_ext_last = ~1;
AFFS_I(inode)->i_protect = prot;
atomic_set(&AFFS_I(inode)->i_opencnt, 0);
AFFS_I(inode)->i_blkcnt = 0;
AFFS_I(inode)->i_lc = NULL;
AFFS_I(inode)->i_lc_size = 0;
AFFS_I(inode)->i_lc_shift = 0;
AFFS_I(inode)->i_lc_mask = 0;
AFFS_I(inode)->i_ac = NULL;
AFFS_I(inode)->i_ext_bh = NULL;
AFFS_I(inode)->mmu_private = 0;
AFFS_I(inode)->i_lastalloc = 0;
AFFS_I(inode)->i_pa_cnt = 0;
if (sbi->s_flags & SF_SETMODE)
inode->i_mode = sbi->s_mode;
else
inode->i_mode = prot_to_mode(prot);
id = be16_to_cpu(tail->uid);
if (id == 0 || sbi->s_flags & SF_SETUID)
inode->i_uid = sbi->s_uid;
else if (id == 0xFFFF && sbi->s_flags & SF_MUFS)
inode->i_uid = 0;
else
inode->i_uid = id;
id = be16_to_cpu(tail->gid);
if (id == 0 || sbi->s_flags & SF_SETGID)
inode->i_gid = sbi->s_gid;
else if (id == 0xFFFF && sbi->s_flags & SF_MUFS)
inode->i_gid = 0;
else
inode->i_gid = id;
switch (be32_to_cpu(tail->stype)) {
case ST_ROOT:
inode->i_uid = sbi->s_uid;
inode->i_gid = sbi->s_gid;
/* fall through */
case ST_USERDIR:
if (be32_to_cpu(tail->stype) == ST_USERDIR ||
sbi->s_flags & SF_SETMODE) {
if (inode->i_mode & S_IRUSR)
inode->i_mode |= S_IXUSR;
if (inode->i_mode & S_IRGRP)
inode->i_mode |= S_IXGRP;
if (inode->i_mode & S_IROTH)
inode->i_mode |= S_IXOTH;
inode->i_mode |= S_IFDIR;
} else
inode->i_mode = S_IRUGO | S_IXUGO | S_IWUSR | S_IFDIR;
/* Maybe it should be controlled by mount parameter? */
//inode->i_mode |= S_ISVTX;
inode->i_op = &affs_dir_inode_operations;
inode->i_fop = &affs_dir_operations;
break;
case ST_LINKDIR:
#if 0
affs_warning(sb, "read_inode", "inode is LINKDIR");
goto bad_inode;
#else
inode->i_mode |= S_IFDIR;
/* ... and leave ->i_op and ->i_fop pointing to empty */
break;
#endif
case ST_LINKFILE:
affs_warning(sb, "read_inode", "inode is LINKFILE");
goto bad_inode;
case ST_FILE:
size = be32_to_cpu(tail->size);
inode->i_mode |= S_IFREG;
AFFS_I(inode)->mmu_private = inode->i_size = size;
if (inode->i_size) {
AFFS_I(inode)->i_blkcnt = (size - 1) /
sbi->s_data_blksize + 1;
AFFS_I(inode)->i_extcnt = (AFFS_I(inode)->i_blkcnt - 1) /
sbi->s_hashsize + 1;
}
if (tail->link_chain)
inode->i_nlink = 2;
inode->i_mapping->a_ops = (sbi->s_flags & SF_OFS) ? &affs_aops_ofs : &affs_aops;
inode->i_op = &affs_file_inode_operations;
inode->i_fop = &affs_file_operations;
break;
case ST_SOFTLINK:
inode->i_mode |= S_IFLNK;
inode->i_op = &affs_symlink_inode_operations;
inode->i_data.a_ops = &affs_symlink_aops;
break;
}
inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec
= (be32_to_cpu(tail->change.days) * (24 * 60 * 60) +
be32_to_cpu(tail->change.mins) * 60 +
be32_to_cpu(tail->change.ticks) / 50 +
((8 * 365 + 2) * 24 * 60 * 60)) +
sys_tz.tz_minuteswest * 60;
inode->i_mtime.tv_nsec = inode->i_ctime.tv_nsec = inode->i_atime.tv_nsec = 0;
affs_brelse(bh);
unlock_new_inode(inode);
return inode;
bad_inode:
affs_brelse(bh);
iget_failed(inode);
return ERR_PTR(-EIO);
}
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;
kuid_t uid;
kgid_t gid;
int reserved;
unsigned long mount_flags;
int tmp_flags; /* fix remount prototype... */
u8 sig[4];
int ret;
save_mount_options(sb, data);
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;
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)) {
printk(KERN_ERR "AFFS: Error parsing options\n");
kfree(sbi->s_prefix);
kfree(sbi);
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);
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) {
printk(KERN_ERR "AFFS: 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->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);
return -EINVAL;
}
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;
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_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) {
printk(KERN_ERR "AFFS: Get root inode failed\n");
return -ENOMEM;
}
pr_debug("AFFS: s_flags=%lX\n",sb->s_flags);
return 0;
}
static int
affs_readdir(struct file *filp, void *dirent, filldir_t filldir)
{
struct inode *inode = filp->f_path.dentry->d_inode;
struct super_block *sb = inode->i_sb;
struct buffer_head *dir_bh;
struct buffer_head *fh_bh;
unsigned char *name;
int namelen;
u32 i;
int hash_pos;
int chain_pos;
u32 f_pos;
u32 ino;
int stored;
int res;
pr_debug("AFFS: readdir(ino=%lu,f_pos=%lx)\n",inode->i_ino,(unsigned long)filp->f_pos);
stored = 0;
res = -EIO;
dir_bh = NULL;
fh_bh = NULL;
f_pos = filp->f_pos;
if (f_pos == 0) {
filp->private_data = (void *)0;
if (filldir(dirent, ".", 1, f_pos, inode->i_ino, DT_DIR) < 0)
return 0;
filp->f_pos = f_pos = 1;
stored++;
}
if (f_pos == 1) {
if (filldir(dirent, "..", 2, f_pos, parent_ino(filp->f_path.dentry), DT_DIR) < 0)
return stored;
filp->f_pos = f_pos = 2;
stored++;
}
affs_lock_dir(inode);
chain_pos = (f_pos - 2) & 0xffff;
hash_pos = (f_pos - 2) >> 16;
if (chain_pos == 0xffff) {
affs_warning(sb, "readdir", "More than 65535 entries in chain");
chain_pos = 0;
hash_pos++;
filp->f_pos = ((hash_pos << 16) | chain_pos) + 2;
}
dir_bh = affs_bread(sb, inode->i_ino);
if (!dir_bh)
goto readdir_out;
ino = (u32)(long)filp->private_data;
if (ino && filp->f_version == inode->i_version) {
pr_debug("AFFS: readdir() left off=%d\n", ino);
goto inside;
}
ino = be32_to_cpu(AFFS_HEAD(dir_bh)->table[hash_pos]);
for (i = 0; ino && i < chain_pos; i++) {
fh_bh = affs_bread(sb, ino);
if (!fh_bh) {
affs_error(sb, "readdir","Cannot read block %d", i);
goto readdir_out;
}
ino = be32_to_cpu(AFFS_TAIL(sb, fh_bh)->hash_chain);
affs_brelse(fh_bh);
fh_bh = NULL;
}
if (ino)
goto inside;
hash_pos++;
for (; hash_pos < AFFS_SB(sb)->s_hashsize; hash_pos++) {
ino = be32_to_cpu(AFFS_HEAD(dir_bh)->table[hash_pos]);
if (!ino)
continue;
f_pos = (hash_pos << 16) + 2;
inside:
do {
fh_bh = affs_bread(sb, ino);
if (!fh_bh) {
affs_error(sb, "readdir","Cannot read block %d", ino);
goto readdir_done;
}
namelen = min(AFFS_TAIL(sb, fh_bh)->name[0], (u8)30);
name = AFFS_TAIL(sb, fh_bh)->name + 1;
pr_debug("AFFS: readdir(): filldir(\"%.*s\", ino=%u), hash=%d, f_pos=%x\n",
namelen, name, ino, hash_pos, f_pos);
if (filldir(dirent, name, namelen, f_pos, ino, DT_UNKNOWN) < 0)
goto readdir_done;
stored++;
f_pos++;
ino = be32_to_cpu(AFFS_TAIL(sb, fh_bh)->hash_chain);
affs_brelse(fh_bh);
fh_bh = NULL;
} while (ino);
}
readdir_done:
filp->f_pos = f_pos;
filp->f_version = inode->i_version;
filp->private_data = (void *)(long)ino;
res = stored;
readdir_out:
affs_brelse(dir_bh);
affs_brelse(fh_bh);
affs_unlock_dir(inode);
pr_debug("AFFS: readdir()=%d\n", stored);
return res;
}
