mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-05 18:16:44 +07:00
2b0143b5c9
that's the bulk of filesystem drivers dealing with inodes of their own Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
372 lines
9.4 KiB
C
372 lines
9.4 KiB
C
/*
|
|
* linux/fs/adfs/inode.c
|
|
*
|
|
* Copyright (C) 1997-1999 Russell King
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
#include <linux/buffer_head.h>
|
|
#include <linux/writeback.h>
|
|
#include "adfs.h"
|
|
|
|
/*
|
|
* Lookup/Create a block at offset 'block' into 'inode'. We currently do
|
|
* not support creation of new blocks, so we return -EIO for this case.
|
|
*/
|
|
static int
|
|
adfs_get_block(struct inode *inode, sector_t block, struct buffer_head *bh,
|
|
int create)
|
|
{
|
|
if (!create) {
|
|
if (block >= inode->i_blocks)
|
|
goto abort_toobig;
|
|
|
|
block = __adfs_block_map(inode->i_sb, inode->i_ino, block);
|
|
if (block)
|
|
map_bh(bh, inode->i_sb, block);
|
|
return 0;
|
|
}
|
|
/* don't support allocation of blocks yet */
|
|
return -EIO;
|
|
|
|
abort_toobig:
|
|
return 0;
|
|
}
|
|
|
|
static int adfs_writepage(struct page *page, struct writeback_control *wbc)
|
|
{
|
|
return block_write_full_page(page, adfs_get_block, wbc);
|
|
}
|
|
|
|
static int adfs_readpage(struct file *file, struct page *page)
|
|
{
|
|
return block_read_full_page(page, adfs_get_block);
|
|
}
|
|
|
|
static void adfs_write_failed(struct address_space *mapping, loff_t to)
|
|
{
|
|
struct inode *inode = mapping->host;
|
|
|
|
if (to > inode->i_size)
|
|
truncate_pagecache(inode, inode->i_size);
|
|
}
|
|
|
|
static int adfs_write_begin(struct file *file, struct address_space *mapping,
|
|
loff_t pos, unsigned len, unsigned flags,
|
|
struct page **pagep, void **fsdata)
|
|
{
|
|
int ret;
|
|
|
|
*pagep = NULL;
|
|
ret = cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
|
|
adfs_get_block,
|
|
&ADFS_I(mapping->host)->mmu_private);
|
|
if (unlikely(ret))
|
|
adfs_write_failed(mapping, pos + len);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static sector_t _adfs_bmap(struct address_space *mapping, sector_t block)
|
|
{
|
|
return generic_block_bmap(mapping, block, adfs_get_block);
|
|
}
|
|
|
|
static const struct address_space_operations adfs_aops = {
|
|
.readpage = adfs_readpage,
|
|
.writepage = adfs_writepage,
|
|
.write_begin = adfs_write_begin,
|
|
.write_end = generic_write_end,
|
|
.bmap = _adfs_bmap
|
|
};
|
|
|
|
/*
|
|
* Convert ADFS attributes and filetype to Linux permission.
|
|
*/
|
|
static umode_t
|
|
adfs_atts2mode(struct super_block *sb, struct inode *inode)
|
|
{
|
|
unsigned int attr = ADFS_I(inode)->attr;
|
|
umode_t mode, rmask;
|
|
struct adfs_sb_info *asb = ADFS_SB(sb);
|
|
|
|
if (attr & ADFS_NDA_DIRECTORY) {
|
|
mode = S_IRUGO & asb->s_owner_mask;
|
|
return S_IFDIR | S_IXUGO | mode;
|
|
}
|
|
|
|
switch (ADFS_I(inode)->filetype) {
|
|
case 0xfc0: /* LinkFS */
|
|
return S_IFLNK|S_IRWXUGO;
|
|
|
|
case 0xfe6: /* UnixExec */
|
|
rmask = S_IRUGO | S_IXUGO;
|
|
break;
|
|
|
|
default:
|
|
rmask = S_IRUGO;
|
|
}
|
|
|
|
mode = S_IFREG;
|
|
|
|
if (attr & ADFS_NDA_OWNER_READ)
|
|
mode |= rmask & asb->s_owner_mask;
|
|
|
|
if (attr & ADFS_NDA_OWNER_WRITE)
|
|
mode |= S_IWUGO & asb->s_owner_mask;
|
|
|
|
if (attr & ADFS_NDA_PUBLIC_READ)
|
|
mode |= rmask & asb->s_other_mask;
|
|
|
|
if (attr & ADFS_NDA_PUBLIC_WRITE)
|
|
mode |= S_IWUGO & asb->s_other_mask;
|
|
return mode;
|
|
}
|
|
|
|
/*
|
|
* Convert Linux permission to ADFS attribute. We try to do the reverse
|
|
* of atts2mode, but there is not a 1:1 translation.
|
|
*/
|
|
static int
|
|
adfs_mode2atts(struct super_block *sb, struct inode *inode)
|
|
{
|
|
umode_t mode;
|
|
int attr;
|
|
struct adfs_sb_info *asb = ADFS_SB(sb);
|
|
|
|
/* FIXME: should we be able to alter a link? */
|
|
if (S_ISLNK(inode->i_mode))
|
|
return ADFS_I(inode)->attr;
|
|
|
|
if (S_ISDIR(inode->i_mode))
|
|
attr = ADFS_NDA_DIRECTORY;
|
|
else
|
|
attr = 0;
|
|
|
|
mode = inode->i_mode & asb->s_owner_mask;
|
|
if (mode & S_IRUGO)
|
|
attr |= ADFS_NDA_OWNER_READ;
|
|
if (mode & S_IWUGO)
|
|
attr |= ADFS_NDA_OWNER_WRITE;
|
|
|
|
mode = inode->i_mode & asb->s_other_mask;
|
|
mode &= ~asb->s_owner_mask;
|
|
if (mode & S_IRUGO)
|
|
attr |= ADFS_NDA_PUBLIC_READ;
|
|
if (mode & S_IWUGO)
|
|
attr |= ADFS_NDA_PUBLIC_WRITE;
|
|
|
|
return attr;
|
|
}
|
|
|
|
/*
|
|
* Convert an ADFS time to Unix time. ADFS has a 40-bit centi-second time
|
|
* referenced to 1 Jan 1900 (til 2248) so we need to discard 2208988800 seconds
|
|
* of time to convert from RISC OS epoch to Unix epoch.
|
|
*/
|
|
static void
|
|
adfs_adfs2unix_time(struct timespec *tv, struct inode *inode)
|
|
{
|
|
unsigned int high, low;
|
|
/* 01 Jan 1970 00:00:00 (Unix epoch) as nanoseconds since
|
|
* 01 Jan 1900 00:00:00 (RISC OS epoch)
|
|
*/
|
|
static const s64 nsec_unix_epoch_diff_risc_os_epoch =
|
|
2208988800000000000LL;
|
|
s64 nsec;
|
|
|
|
if (ADFS_I(inode)->stamped == 0)
|
|
goto cur_time;
|
|
|
|
high = ADFS_I(inode)->loadaddr & 0xFF; /* top 8 bits of timestamp */
|
|
low = ADFS_I(inode)->execaddr; /* bottom 32 bits of timestamp */
|
|
|
|
/* convert 40-bit centi-seconds to 32-bit seconds
|
|
* going via nanoseconds to retain precision
|
|
*/
|
|
nsec = (((s64) high << 32) | (s64) low) * 10000000; /* cs to ns */
|
|
|
|
/* Files dated pre 01 Jan 1970 00:00:00. */
|
|
if (nsec < nsec_unix_epoch_diff_risc_os_epoch)
|
|
goto too_early;
|
|
|
|
/* convert from RISC OS to Unix epoch */
|
|
nsec -= nsec_unix_epoch_diff_risc_os_epoch;
|
|
|
|
*tv = ns_to_timespec(nsec);
|
|
return;
|
|
|
|
cur_time:
|
|
*tv = CURRENT_TIME;
|
|
return;
|
|
|
|
too_early:
|
|
tv->tv_sec = tv->tv_nsec = 0;
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Convert an Unix time to ADFS time. We only do this if the entry has a
|
|
* time/date stamp already.
|
|
*/
|
|
static void
|
|
adfs_unix2adfs_time(struct inode *inode, unsigned int secs)
|
|
{
|
|
unsigned int high, low;
|
|
|
|
if (ADFS_I(inode)->stamped) {
|
|
/* convert 32-bit seconds to 40-bit centi-seconds */
|
|
low = (secs & 255) * 100;
|
|
high = (secs / 256) * 100 + (low >> 8) + 0x336e996a;
|
|
|
|
ADFS_I(inode)->loadaddr = (high >> 24) |
|
|
(ADFS_I(inode)->loadaddr & ~0xff);
|
|
ADFS_I(inode)->execaddr = (low & 255) | (high << 8);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Fill in the inode information from the object information.
|
|
*
|
|
* Note that this is an inode-less filesystem, so we can't use the inode
|
|
* number to reference the metadata on the media. Instead, we use the
|
|
* inode number to hold the object ID, which in turn will tell us where
|
|
* the data is held. We also save the parent object ID, and with these
|
|
* two, we can locate the metadata.
|
|
*
|
|
* This does mean that we rely on an objects parent remaining the same at
|
|
* all times - we cannot cope with a cross-directory rename (yet).
|
|
*/
|
|
struct inode *
|
|
adfs_iget(struct super_block *sb, struct object_info *obj)
|
|
{
|
|
struct inode *inode;
|
|
|
|
inode = new_inode(sb);
|
|
if (!inode)
|
|
goto out;
|
|
|
|
inode->i_uid = ADFS_SB(sb)->s_uid;
|
|
inode->i_gid = ADFS_SB(sb)->s_gid;
|
|
inode->i_ino = obj->file_id;
|
|
inode->i_size = obj->size;
|
|
set_nlink(inode, 2);
|
|
inode->i_blocks = (inode->i_size + sb->s_blocksize - 1) >>
|
|
sb->s_blocksize_bits;
|
|
|
|
/*
|
|
* we need to save the parent directory ID so that
|
|
* write_inode can update the directory information
|
|
* for this file. This will need special handling
|
|
* for cross-directory renames.
|
|
*/
|
|
ADFS_I(inode)->parent_id = obj->parent_id;
|
|
ADFS_I(inode)->loadaddr = obj->loadaddr;
|
|
ADFS_I(inode)->execaddr = obj->execaddr;
|
|
ADFS_I(inode)->attr = obj->attr;
|
|
ADFS_I(inode)->filetype = obj->filetype;
|
|
ADFS_I(inode)->stamped = ((obj->loadaddr & 0xfff00000) == 0xfff00000);
|
|
|
|
inode->i_mode = adfs_atts2mode(sb, inode);
|
|
adfs_adfs2unix_time(&inode->i_mtime, inode);
|
|
inode->i_atime = inode->i_mtime;
|
|
inode->i_ctime = inode->i_mtime;
|
|
|
|
if (S_ISDIR(inode->i_mode)) {
|
|
inode->i_op = &adfs_dir_inode_operations;
|
|
inode->i_fop = &adfs_dir_operations;
|
|
} else if (S_ISREG(inode->i_mode)) {
|
|
inode->i_op = &adfs_file_inode_operations;
|
|
inode->i_fop = &adfs_file_operations;
|
|
inode->i_mapping->a_ops = &adfs_aops;
|
|
ADFS_I(inode)->mmu_private = inode->i_size;
|
|
}
|
|
|
|
insert_inode_hash(inode);
|
|
|
|
out:
|
|
return inode;
|
|
}
|
|
|
|
/*
|
|
* Validate and convert a changed access mode/time to their ADFS equivalents.
|
|
* adfs_write_inode will actually write the information back to the directory
|
|
* later.
|
|
*/
|
|
int
|
|
adfs_notify_change(struct dentry *dentry, struct iattr *attr)
|
|
{
|
|
struct inode *inode = d_inode(dentry);
|
|
struct super_block *sb = inode->i_sb;
|
|
unsigned int ia_valid = attr->ia_valid;
|
|
int error;
|
|
|
|
error = inode_change_ok(inode, attr);
|
|
|
|
/*
|
|
* we can't change the UID or GID of any file -
|
|
* we have a global UID/GID in the superblock
|
|
*/
|
|
if ((ia_valid & ATTR_UID && !uid_eq(attr->ia_uid, ADFS_SB(sb)->s_uid)) ||
|
|
(ia_valid & ATTR_GID && !gid_eq(attr->ia_gid, ADFS_SB(sb)->s_gid)))
|
|
error = -EPERM;
|
|
|
|
if (error)
|
|
goto out;
|
|
|
|
/* XXX: this is missing some actual on-disk truncation.. */
|
|
if (ia_valid & ATTR_SIZE)
|
|
truncate_setsize(inode, attr->ia_size);
|
|
|
|
if (ia_valid & ATTR_MTIME) {
|
|
inode->i_mtime = attr->ia_mtime;
|
|
adfs_unix2adfs_time(inode, attr->ia_mtime.tv_sec);
|
|
}
|
|
/*
|
|
* FIXME: should we make these == to i_mtime since we don't
|
|
* have the ability to represent them in our filesystem?
|
|
*/
|
|
if (ia_valid & ATTR_ATIME)
|
|
inode->i_atime = attr->ia_atime;
|
|
if (ia_valid & ATTR_CTIME)
|
|
inode->i_ctime = attr->ia_ctime;
|
|
if (ia_valid & ATTR_MODE) {
|
|
ADFS_I(inode)->attr = adfs_mode2atts(sb, inode);
|
|
inode->i_mode = adfs_atts2mode(sb, inode);
|
|
}
|
|
|
|
/*
|
|
* FIXME: should we be marking this inode dirty even if
|
|
* we don't have any metadata to write back?
|
|
*/
|
|
if (ia_valid & (ATTR_SIZE | ATTR_MTIME | ATTR_MODE))
|
|
mark_inode_dirty(inode);
|
|
out:
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* write an existing inode back to the directory, and therefore the disk.
|
|
* The adfs-specific inode data has already been updated by
|
|
* adfs_notify_change()
|
|
*/
|
|
int adfs_write_inode(struct inode *inode, struct writeback_control *wbc)
|
|
{
|
|
struct super_block *sb = inode->i_sb;
|
|
struct object_info obj;
|
|
int ret;
|
|
|
|
obj.file_id = inode->i_ino;
|
|
obj.name_len = 0;
|
|
obj.parent_id = ADFS_I(inode)->parent_id;
|
|
obj.loadaddr = ADFS_I(inode)->loadaddr;
|
|
obj.execaddr = ADFS_I(inode)->execaddr;
|
|
obj.attr = ADFS_I(inode)->attr;
|
|
obj.size = inode->i_size;
|
|
|
|
ret = adfs_dir_update(sb, &obj, wbc->sync_mode == WB_SYNC_ALL);
|
|
return ret;
|
|
}
|