544 lines
12 KiB
C
544 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* linux/fs/affs/amigaffs.c
|
|
*
|
|
* (c) 1996 Hans-Joachim Widmaier - Rewritten
|
|
*
|
|
* (C) 1993 Ray Burr - Amiga FFS filesystem.
|
|
*
|
|
* Please send bug reports to: hjw@zvw.de
|
|
*/
|
|
|
|
#include <linux/math64.h>
|
|
#include <linux/iversion.h>
|
|
#include "affs.h"
|
|
|
|
/*
|
|
* Functions for accessing Amiga-FFS structures.
|
|
*/
|
|
|
|
|
|
/* Insert a header block bh into the directory dir
|
|
* caller must hold AFFS_DIR->i_hash_lock!
|
|
*/
|
|
|
|
int
|
|
affs_insert_hash(struct inode *dir, struct buffer_head *bh)
|
|
{
|
|
struct super_block *sb = dir->i_sb;
|
|
struct buffer_head *dir_bh;
|
|
u32 ino, hash_ino;
|
|
int offset;
|
|
|
|
ino = bh->b_blocknr;
|
|
offset = affs_hash_name(sb, AFFS_TAIL(sb, bh)->name + 1, AFFS_TAIL(sb, bh)->name[0]);
|
|
|
|
pr_debug("%s(dir=%lu, ino=%d)\n", __func__, dir->i_ino, ino);
|
|
|
|
dir_bh = affs_bread(sb, dir->i_ino);
|
|
if (!dir_bh)
|
|
return -EIO;
|
|
|
|
hash_ino = be32_to_cpu(AFFS_HEAD(dir_bh)->table[offset]);
|
|
while (hash_ino) {
|
|
affs_brelse(dir_bh);
|
|
dir_bh = affs_bread(sb, hash_ino);
|
|
if (!dir_bh)
|
|
return -EIO;
|
|
hash_ino = be32_to_cpu(AFFS_TAIL(sb, dir_bh)->hash_chain);
|
|
}
|
|
AFFS_TAIL(sb, bh)->parent = cpu_to_be32(dir->i_ino);
|
|
AFFS_TAIL(sb, bh)->hash_chain = 0;
|
|
affs_fix_checksum(sb, bh);
|
|
|
|
if (dir->i_ino == dir_bh->b_blocknr)
|
|
AFFS_HEAD(dir_bh)->table[offset] = cpu_to_be32(ino);
|
|
else
|
|
AFFS_TAIL(sb, dir_bh)->hash_chain = cpu_to_be32(ino);
|
|
|
|
affs_adjust_checksum(dir_bh, ino);
|
|
mark_buffer_dirty_inode(dir_bh, dir);
|
|
affs_brelse(dir_bh);
|
|
|
|
dir->i_mtime = dir->i_ctime = current_time(dir);
|
|
inode_inc_iversion(dir);
|
|
mark_inode_dirty(dir);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Remove a header block from its directory.
|
|
* caller must hold AFFS_DIR->i_hash_lock!
|
|
*/
|
|
|
|
int
|
|
affs_remove_hash(struct inode *dir, struct buffer_head *rem_bh)
|
|
{
|
|
struct super_block *sb;
|
|
struct buffer_head *bh;
|
|
u32 rem_ino, hash_ino;
|
|
__be32 ino;
|
|
int offset, retval;
|
|
|
|
sb = dir->i_sb;
|
|
rem_ino = rem_bh->b_blocknr;
|
|
offset = affs_hash_name(sb, AFFS_TAIL(sb, rem_bh)->name+1, AFFS_TAIL(sb, rem_bh)->name[0]);
|
|
pr_debug("%s(dir=%lu, ino=%d, hashval=%d)\n", __func__, dir->i_ino,
|
|
rem_ino, offset);
|
|
|
|
bh = affs_bread(sb, dir->i_ino);
|
|
if (!bh)
|
|
return -EIO;
|
|
|
|
retval = -ENOENT;
|
|
hash_ino = be32_to_cpu(AFFS_HEAD(bh)->table[offset]);
|
|
while (hash_ino) {
|
|
if (hash_ino == rem_ino) {
|
|
ino = AFFS_TAIL(sb, rem_bh)->hash_chain;
|
|
if (dir->i_ino == bh->b_blocknr)
|
|
AFFS_HEAD(bh)->table[offset] = ino;
|
|
else
|
|
AFFS_TAIL(sb, bh)->hash_chain = ino;
|
|
affs_adjust_checksum(bh, be32_to_cpu(ino) - hash_ino);
|
|
mark_buffer_dirty_inode(bh, dir);
|
|
AFFS_TAIL(sb, rem_bh)->parent = 0;
|
|
retval = 0;
|
|
break;
|
|
}
|
|
affs_brelse(bh);
|
|
bh = affs_bread(sb, hash_ino);
|
|
if (!bh)
|
|
return -EIO;
|
|
hash_ino = be32_to_cpu(AFFS_TAIL(sb, bh)->hash_chain);
|
|
}
|
|
|
|
affs_brelse(bh);
|
|
|
|
dir->i_mtime = dir->i_ctime = current_time(dir);
|
|
inode_inc_iversion(dir);
|
|
mark_inode_dirty(dir);
|
|
|
|
return retval;
|
|
}
|
|
|
|
static void
|
|
affs_fix_dcache(struct inode *inode, u32 entry_ino)
|
|
{
|
|
struct dentry *dentry;
|
|
spin_lock(&inode->i_lock);
|
|
hlist_for_each_entry(dentry, &inode->i_dentry, d_u.d_alias) {
|
|
if (entry_ino == (u32)(long)dentry->d_fsdata) {
|
|
dentry->d_fsdata = (void *)inode->i_ino;
|
|
break;
|
|
}
|
|
}
|
|
spin_unlock(&inode->i_lock);
|
|
}
|
|
|
|
|
|
/* Remove header from link chain */
|
|
|
|
static int
|
|
affs_remove_link(struct dentry *dentry)
|
|
{
|
|
struct inode *dir, *inode = d_inode(dentry);
|
|
struct super_block *sb = inode->i_sb;
|
|
struct buffer_head *bh, *link_bh = NULL;
|
|
u32 link_ino, ino;
|
|
int retval;
|
|
|
|
pr_debug("%s(key=%ld)\n", __func__, inode->i_ino);
|
|
retval = -EIO;
|
|
bh = affs_bread(sb, inode->i_ino);
|
|
if (!bh)
|
|
goto done;
|
|
|
|
link_ino = (u32)(long)dentry->d_fsdata;
|
|
if (inode->i_ino == link_ino) {
|
|
/* we can't remove the head of the link, as its blocknr is still used as ino,
|
|
* so we remove the block of the first link instead.
|
|
*/
|
|
link_ino = be32_to_cpu(AFFS_TAIL(sb, bh)->link_chain);
|
|
link_bh = affs_bread(sb, link_ino);
|
|
if (!link_bh)
|
|
goto done;
|
|
|
|
dir = affs_iget(sb, be32_to_cpu(AFFS_TAIL(sb, link_bh)->parent));
|
|
if (IS_ERR(dir)) {
|
|
retval = PTR_ERR(dir);
|
|
goto done;
|
|
}
|
|
|
|
affs_lock_dir(dir);
|
|
/*
|
|
* if there's a dentry for that block, make it
|
|
* refer to inode itself.
|
|
*/
|
|
affs_fix_dcache(inode, link_ino);
|
|
retval = affs_remove_hash(dir, link_bh);
|
|
if (retval) {
|
|
affs_unlock_dir(dir);
|
|
goto done;
|
|
}
|
|
mark_buffer_dirty_inode(link_bh, inode);
|
|
|
|
memcpy(AFFS_TAIL(sb, bh)->name, AFFS_TAIL(sb, link_bh)->name, 32);
|
|
retval = affs_insert_hash(dir, bh);
|
|
if (retval) {
|
|
affs_unlock_dir(dir);
|
|
goto done;
|
|
}
|
|
mark_buffer_dirty_inode(bh, inode);
|
|
|
|
affs_unlock_dir(dir);
|
|
iput(dir);
|
|
} else {
|
|
link_bh = affs_bread(sb, link_ino);
|
|
if (!link_bh)
|
|
goto done;
|
|
}
|
|
|
|
while ((ino = be32_to_cpu(AFFS_TAIL(sb, bh)->link_chain)) != 0) {
|
|
if (ino == link_ino) {
|
|
__be32 ino2 = AFFS_TAIL(sb, link_bh)->link_chain;
|
|
AFFS_TAIL(sb, bh)->link_chain = ino2;
|
|
affs_adjust_checksum(bh, be32_to_cpu(ino2) - link_ino);
|
|
mark_buffer_dirty_inode(bh, inode);
|
|
retval = 0;
|
|
/* Fix the link count, if bh is a normal header block without links */
|
|
switch (be32_to_cpu(AFFS_TAIL(sb, bh)->stype)) {
|
|
case ST_LINKDIR:
|
|
case ST_LINKFILE:
|
|
break;
|
|
default:
|
|
if (!AFFS_TAIL(sb, bh)->link_chain)
|
|
set_nlink(inode, 1);
|
|
}
|
|
affs_free_block(sb, link_ino);
|
|
goto done;
|
|
}
|
|
affs_brelse(bh);
|
|
bh = affs_bread(sb, ino);
|
|
if (!bh)
|
|
goto done;
|
|
}
|
|
retval = -ENOENT;
|
|
done:
|
|
affs_brelse(link_bh);
|
|
affs_brelse(bh);
|
|
return retval;
|
|
}
|
|
|
|
|
|
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;
|
|
}
|
|
|
|
|
|
/* Remove a filesystem object. If the object to be removed has
|
|
* links to it, one of the links must be changed to inherit
|
|
* the file or directory. As above, any inode will do.
|
|
* The buffer will not be freed. If the header is a link, the
|
|
* block will be marked as free.
|
|
* This function returns a negative error number in case of
|
|
* an error, else 0 if the inode is to be deleted or 1 if not.
|
|
*/
|
|
|
|
int
|
|
affs_remove_header(struct dentry *dentry)
|
|
{
|
|
struct super_block *sb;
|
|
struct inode *inode, *dir;
|
|
struct buffer_head *bh = NULL;
|
|
int retval;
|
|
|
|
dir = d_inode(dentry->d_parent);
|
|
sb = dir->i_sb;
|
|
|
|
retval = -ENOENT;
|
|
inode = d_inode(dentry);
|
|
if (!inode)
|
|
goto done;
|
|
|
|
pr_debug("%s(key=%ld)\n", __func__, inode->i_ino);
|
|
retval = -EIO;
|
|
bh = affs_bread(sb, (u32)(long)dentry->d_fsdata);
|
|
if (!bh)
|
|
goto done;
|
|
|
|
affs_lock_link(inode);
|
|
affs_lock_dir(dir);
|
|
switch (be32_to_cpu(AFFS_TAIL(sb, bh)->stype)) {
|
|
case ST_USERDIR:
|
|
/* if we ever want to support links to dirs
|
|
* i_hash_lock of the inode must only be
|
|
* taken after some checks
|
|
*/
|
|
affs_lock_dir(inode);
|
|
retval = affs_empty_dir(inode);
|
|
affs_unlock_dir(inode);
|
|
if (retval)
|
|
goto done_unlock;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
retval = affs_remove_hash(dir, bh);
|
|
if (retval)
|
|
goto done_unlock;
|
|
mark_buffer_dirty_inode(bh, inode);
|
|
|
|
affs_unlock_dir(dir);
|
|
|
|
if (inode->i_nlink > 1)
|
|
retval = affs_remove_link(dentry);
|
|
else
|
|
clear_nlink(inode);
|
|
affs_unlock_link(inode);
|
|
inode->i_ctime = current_time(inode);
|
|
mark_inode_dirty(inode);
|
|
|
|
done:
|
|
affs_brelse(bh);
|
|
return retval;
|
|
|
|
done_unlock:
|
|
affs_unlock_dir(dir);
|
|
affs_unlock_link(inode);
|
|
goto done;
|
|
}
|
|
|
|
/* Checksum a block, do various consistency checks and optionally return
|
|
the blocks type number. DATA points to the block. If their pointers
|
|
are non-null, *PTYPE and *STYPE are set to the primary and secondary
|
|
block types respectively, *HASHSIZE is set to the size of the hashtable
|
|
(which lets us calculate the block size).
|
|
Returns non-zero if the block is not consistent. */
|
|
|
|
u32
|
|
affs_checksum_block(struct super_block *sb, struct buffer_head *bh)
|
|
{
|
|
__be32 *ptr = (__be32 *)bh->b_data;
|
|
u32 sum;
|
|
int bsize;
|
|
|
|
sum = 0;
|
|
for (bsize = sb->s_blocksize / sizeof(__be32); bsize > 0; bsize--)
|
|
sum += be32_to_cpu(*ptr++);
|
|
return sum;
|
|
}
|
|
|
|
/*
|
|
* Calculate the checksum of a disk block and store it
|
|
* at the indicated position.
|
|
*/
|
|
|
|
void
|
|
affs_fix_checksum(struct super_block *sb, struct buffer_head *bh)
|
|
{
|
|
int cnt = sb->s_blocksize / sizeof(__be32);
|
|
__be32 *ptr = (__be32 *)bh->b_data;
|
|
u32 checksum;
|
|
__be32 *checksumptr;
|
|
|
|
checksumptr = ptr + 5;
|
|
*checksumptr = 0;
|
|
for (checksum = 0; cnt > 0; ptr++, cnt--)
|
|
checksum += be32_to_cpu(*ptr);
|
|
*checksumptr = cpu_to_be32(-checksum);
|
|
}
|
|
|
|
void
|
|
affs_secs_to_datestamp(time64_t secs, struct affs_date *ds)
|
|
{
|
|
u32 days;
|
|
u32 minute;
|
|
s32 rem;
|
|
|
|
secs -= sys_tz.tz_minuteswest * 60 + AFFS_EPOCH_DELTA;
|
|
if (secs < 0)
|
|
secs = 0;
|
|
days = div_s64_rem(secs, 86400, &rem);
|
|
minute = rem / 60;
|
|
rem -= minute * 60;
|
|
|
|
ds->days = cpu_to_be32(days);
|
|
ds->mins = cpu_to_be32(minute);
|
|
ds->ticks = cpu_to_be32(rem * 50);
|
|
}
|
|
|
|
umode_t
|
|
affs_prot_to_mode(u32 prot)
|
|
{
|
|
umode_t mode = 0;
|
|
|
|
if (!(prot & FIBF_NOWRITE))
|
|
mode |= 0200;
|
|
if (!(prot & FIBF_NOREAD))
|
|
mode |= 0400;
|
|
if (!(prot & FIBF_NOEXECUTE))
|
|
mode |= 0100;
|
|
if (prot & FIBF_GRP_WRITE)
|
|
mode |= 0020;
|
|
if (prot & FIBF_GRP_READ)
|
|
mode |= 0040;
|
|
if (prot & FIBF_GRP_EXECUTE)
|
|
mode |= 0010;
|
|
if (prot & FIBF_OTR_WRITE)
|
|
mode |= 0002;
|
|
if (prot & FIBF_OTR_READ)
|
|
mode |= 0004;
|
|
if (prot & FIBF_OTR_EXECUTE)
|
|
mode |= 0001;
|
|
|
|
return mode;
|
|
}
|
|
|
|
void
|
|
affs_mode_to_prot(struct inode *inode)
|
|
{
|
|
u32 prot = AFFS_I(inode)->i_protect;
|
|
umode_t mode = inode->i_mode;
|
|
|
|
/*
|
|
* First, clear all RWED bits for owner, group, other.
|
|
* Then, recalculate them afresh.
|
|
*
|
|
* We'll always clear the delete-inhibit bit for the owner, as that is
|
|
* the classic single-user mode AmigaOS protection bit and we need to
|
|
* stay compatible with all scenarios.
|
|
*
|
|
* Since multi-user AmigaOS is an extension, we'll only set the
|
|
* delete-allow bit if any of the other bits in the same user class
|
|
* (group/other) are used.
|
|
*/
|
|
prot &= ~(FIBF_NOEXECUTE | FIBF_NOREAD
|
|
| FIBF_NOWRITE | FIBF_NODELETE
|
|
| FIBF_GRP_EXECUTE | FIBF_GRP_READ
|
|
| FIBF_GRP_WRITE | FIBF_GRP_DELETE
|
|
| FIBF_OTR_EXECUTE | FIBF_OTR_READ
|
|
| FIBF_OTR_WRITE | FIBF_OTR_DELETE);
|
|
|
|
/* Classic single-user AmigaOS flags. These are inverted. */
|
|
if (!(mode & 0100))
|
|
prot |= FIBF_NOEXECUTE;
|
|
if (!(mode & 0400))
|
|
prot |= FIBF_NOREAD;
|
|
if (!(mode & 0200))
|
|
prot |= FIBF_NOWRITE;
|
|
|
|
/* Multi-user extended flags. Not inverted. */
|
|
if (mode & 0010)
|
|
prot |= FIBF_GRP_EXECUTE;
|
|
if (mode & 0040)
|
|
prot |= FIBF_GRP_READ;
|
|
if (mode & 0020)
|
|
prot |= FIBF_GRP_WRITE;
|
|
if (mode & 0070)
|
|
prot |= FIBF_GRP_DELETE;
|
|
|
|
if (mode & 0001)
|
|
prot |= FIBF_OTR_EXECUTE;
|
|
if (mode & 0004)
|
|
prot |= FIBF_OTR_READ;
|
|
if (mode & 0002)
|
|
prot |= FIBF_OTR_WRITE;
|
|
if (mode & 0007)
|
|
prot |= FIBF_OTR_DELETE;
|
|
|
|
AFFS_I(inode)->i_protect = prot;
|
|
}
|
|
|
|
void
|
|
affs_error(struct super_block *sb, const char *function, const char *fmt, ...)
|
|
{
|
|
struct va_format vaf;
|
|
va_list args;
|
|
|
|
va_start(args, fmt);
|
|
vaf.fmt = fmt;
|
|
vaf.va = &args;
|
|
pr_crit("error (device %s): %s(): %pV\n", sb->s_id, function, &vaf);
|
|
if (!sb_rdonly(sb))
|
|
pr_warn("Remounting filesystem read-only\n");
|
|
sb->s_flags |= SB_RDONLY;
|
|
va_end(args);
|
|
}
|
|
|
|
void
|
|
affs_warning(struct super_block *sb, const char *function, const char *fmt, ...)
|
|
{
|
|
struct va_format vaf;
|
|
va_list args;
|
|
|
|
va_start(args, fmt);
|
|
vaf.fmt = fmt;
|
|
vaf.va = &args;
|
|
pr_warn("(device %s): %s(): %pV\n", sb->s_id, function, &vaf);
|
|
va_end(args);
|
|
}
|
|
|
|
bool
|
|
affs_nofilenametruncate(const struct dentry *dentry)
|
|
{
|
|
return affs_test_opt(AFFS_SB(dentry->d_sb)->s_flags, SF_NO_TRUNCATE);
|
|
}
|
|
|
|
/* Check if the name is valid for a affs object. */
|
|
|
|
int
|
|
affs_check_name(const unsigned char *name, int len, bool notruncate)
|
|
{
|
|
int i;
|
|
|
|
if (len > AFFSNAMEMAX) {
|
|
if (notruncate)
|
|
return -ENAMETOOLONG;
|
|
len = AFFSNAMEMAX;
|
|
}
|
|
for (i = 0; i < len; i++) {
|
|
if (name[i] < ' ' || name[i] == ':'
|
|
|| (name[i] > 0x7e && name[i] < 0xa0))
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* This function copies name to bstr, with at most 30
|
|
* characters length. The bstr will be prepended by
|
|
* a length byte.
|
|
* NOTE: The name will must be already checked by
|
|
* affs_check_name()!
|
|
*/
|
|
|
|
int
|
|
affs_copy_name(unsigned char *bstr, struct dentry *dentry)
|
|
{
|
|
u32 len = min(dentry->d_name.len, AFFSNAMEMAX);
|
|
|
|
*bstr++ = len;
|
|
memcpy(bstr, dentry->d_name.name, len);
|
|
return len;
|
|
}
|