![Stuart Swales](/assets/img/avatar_default.png)
ADFS (FileCore) storage complies with the RISC OS filetype specification (12 bits of file type information is stored in the file load address, rather than using a file extension). The existing driver largely ignores this information and does not present it to the end user. It is desirable that stored filetypes be made visible to the end user to facilitate a precise copy of data and metadata from a hard disc (or image thereof) into a RISC OS emulator (such as RPCEmu) or to a network share which can be accessed by real Acorn systems. This patch implements a per-mount filetype suffix option (use -o ftsuffix=1) to present any filetype as a ,xyz hexadecimal suffix on each file. This type suffix is compatible with that used by RISC OS systems that access network servers using NFS client software and by RPCemu's host filing system. Signed-off-by: Stuart Swales <stuart.swales.croftnuisk@gmail.com> Cc: Russell King <rmk@arm.linux.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
368 lines
9.3 KiB
C
368 lines
9.3 KiB
C
/*
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* linux/fs/adfs/inode.c
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*
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* Copyright (C) 1997-1999 Russell King
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/buffer_head.h>
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#include <linux/writeback.h>
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#include "adfs.h"
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/*
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* Lookup/Create a block at offset 'block' into 'inode'. We currently do
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* not support creation of new blocks, so we return -EIO for this case.
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*/
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static int
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adfs_get_block(struct inode *inode, sector_t block, struct buffer_head *bh,
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int create)
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{
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if (!create) {
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if (block >= inode->i_blocks)
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goto abort_toobig;
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block = __adfs_block_map(inode->i_sb, inode->i_ino, block);
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if (block)
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map_bh(bh, inode->i_sb, block);
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return 0;
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}
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/* don't support allocation of blocks yet */
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return -EIO;
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abort_toobig:
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return 0;
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}
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static int adfs_writepage(struct page *page, struct writeback_control *wbc)
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{
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return block_write_full_page(page, adfs_get_block, wbc);
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}
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static int adfs_readpage(struct file *file, struct page *page)
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{
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return block_read_full_page(page, adfs_get_block);
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}
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static int adfs_write_begin(struct file *file, struct address_space *mapping,
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loff_t pos, unsigned len, unsigned flags,
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struct page **pagep, void **fsdata)
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{
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int ret;
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*pagep = NULL;
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ret = cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
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adfs_get_block,
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&ADFS_I(mapping->host)->mmu_private);
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if (unlikely(ret)) {
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loff_t isize = mapping->host->i_size;
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if (pos + len > isize)
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vmtruncate(mapping->host, isize);
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}
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return ret;
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}
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static sector_t _adfs_bmap(struct address_space *mapping, sector_t block)
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{
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return generic_block_bmap(mapping, block, adfs_get_block);
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}
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static const struct address_space_operations adfs_aops = {
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.readpage = adfs_readpage,
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.writepage = adfs_writepage,
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.sync_page = block_sync_page,
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.write_begin = adfs_write_begin,
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.write_end = generic_write_end,
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.bmap = _adfs_bmap
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};
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/*
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* Convert ADFS attributes and filetype to Linux permission.
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*/
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static umode_t
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adfs_atts2mode(struct super_block *sb, struct inode *inode)
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{
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unsigned int attr = ADFS_I(inode)->attr;
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umode_t mode, rmask;
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struct adfs_sb_info *asb = ADFS_SB(sb);
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if (attr & ADFS_NDA_DIRECTORY) {
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mode = S_IRUGO & asb->s_owner_mask;
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return S_IFDIR | S_IXUGO | mode;
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}
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switch (ADFS_I(inode)->filetype) {
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case 0xfc0: /* LinkFS */
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return S_IFLNK|S_IRWXUGO;
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case 0xfe6: /* UnixExec */
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rmask = S_IRUGO | S_IXUGO;
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break;
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default:
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rmask = S_IRUGO;
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}
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mode = S_IFREG;
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if (attr & ADFS_NDA_OWNER_READ)
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mode |= rmask & asb->s_owner_mask;
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if (attr & ADFS_NDA_OWNER_WRITE)
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mode |= S_IWUGO & asb->s_owner_mask;
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if (attr & ADFS_NDA_PUBLIC_READ)
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mode |= rmask & asb->s_other_mask;
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if (attr & ADFS_NDA_PUBLIC_WRITE)
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mode |= S_IWUGO & asb->s_other_mask;
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return mode;
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}
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/*
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* Convert Linux permission to ADFS attribute. We try to do the reverse
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* of atts2mode, but there is not a 1:1 translation.
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*/
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static int
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adfs_mode2atts(struct super_block *sb, struct inode *inode)
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{
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umode_t mode;
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int attr;
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struct adfs_sb_info *asb = ADFS_SB(sb);
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/* FIXME: should we be able to alter a link? */
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if (S_ISLNK(inode->i_mode))
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return ADFS_I(inode)->attr;
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if (S_ISDIR(inode->i_mode))
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attr = ADFS_NDA_DIRECTORY;
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else
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attr = 0;
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mode = inode->i_mode & asb->s_owner_mask;
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if (mode & S_IRUGO)
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attr |= ADFS_NDA_OWNER_READ;
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if (mode & S_IWUGO)
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attr |= ADFS_NDA_OWNER_WRITE;
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mode = inode->i_mode & asb->s_other_mask;
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mode &= ~asb->s_owner_mask;
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if (mode & S_IRUGO)
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attr |= ADFS_NDA_PUBLIC_READ;
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if (mode & S_IWUGO)
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attr |= ADFS_NDA_PUBLIC_WRITE;
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return attr;
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}
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/*
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* Convert an ADFS time to Unix time. ADFS has a 40-bit centi-second time
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* referenced to 1 Jan 1900 (til 2248) so we need to discard 2208988800 seconds
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* of time to convert from RISC OS epoch to Unix epoch.
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*/
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static void
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adfs_adfs2unix_time(struct timespec *tv, struct inode *inode)
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{
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unsigned int high, low;
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/* 01 Jan 1970 00:00:00 (Unix epoch) as nanoseconds since
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* 01 Jan 1900 00:00:00 (RISC OS epoch)
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*/
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static const s64 nsec_unix_epoch_diff_risc_os_epoch =
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2208988800000000000LL;
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s64 nsec;
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if (ADFS_I(inode)->stamped == 0)
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goto cur_time;
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high = ADFS_I(inode)->loadaddr & 0xFF; /* top 8 bits of timestamp */
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low = ADFS_I(inode)->execaddr; /* bottom 32 bits of timestamp */
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/* convert 40-bit centi-seconds to 32-bit seconds
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* going via nanoseconds to retain precision
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*/
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nsec = (((s64) high << 32) | (s64) low) * 10000000; /* cs to ns */
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/* Files dated pre 01 Jan 1970 00:00:00. */
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if (nsec < nsec_unix_epoch_diff_risc_os_epoch)
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goto too_early;
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/* convert from RISC OS to Unix epoch */
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nsec -= nsec_unix_epoch_diff_risc_os_epoch;
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*tv = ns_to_timespec(nsec);
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return;
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cur_time:
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*tv = CURRENT_TIME;
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return;
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too_early:
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tv->tv_sec = tv->tv_nsec = 0;
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return;
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}
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/*
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* Convert an Unix time to ADFS time. We only do this if the entry has a
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* time/date stamp already.
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*/
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static void
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adfs_unix2adfs_time(struct inode *inode, unsigned int secs)
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{
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unsigned int high, low;
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if (ADFS_I(inode)->stamped) {
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/* convert 32-bit seconds to 40-bit centi-seconds */
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low = (secs & 255) * 100;
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high = (secs / 256) * 100 + (low >> 8) + 0x336e996a;
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ADFS_I(inode)->loadaddr = (high >> 24) |
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(ADFS_I(inode)->loadaddr & ~0xff);
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ADFS_I(inode)->execaddr = (low & 255) | (high << 8);
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}
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}
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/*
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* Fill in the inode information from the object information.
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*
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* Note that this is an inode-less filesystem, so we can't use the inode
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* number to reference the metadata on the media. Instead, we use the
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* inode number to hold the object ID, which in turn will tell us where
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* the data is held. We also save the parent object ID, and with these
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* two, we can locate the metadata.
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*
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* This does mean that we rely on an objects parent remaining the same at
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* all times - we cannot cope with a cross-directory rename (yet).
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*/
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struct inode *
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adfs_iget(struct super_block *sb, struct object_info *obj)
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{
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struct inode *inode;
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inode = new_inode(sb);
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if (!inode)
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goto out;
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inode->i_uid = ADFS_SB(sb)->s_uid;
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inode->i_gid = ADFS_SB(sb)->s_gid;
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inode->i_ino = obj->file_id;
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inode->i_size = obj->size;
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inode->i_nlink = 2;
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inode->i_blocks = (inode->i_size + sb->s_blocksize - 1) >>
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sb->s_blocksize_bits;
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/*
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* we need to save the parent directory ID so that
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* write_inode can update the directory information
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* for this file. This will need special handling
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* for cross-directory renames.
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*/
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ADFS_I(inode)->parent_id = obj->parent_id;
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ADFS_I(inode)->loadaddr = obj->loadaddr;
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ADFS_I(inode)->execaddr = obj->execaddr;
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ADFS_I(inode)->attr = obj->attr;
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ADFS_I(inode)->filetype = obj->filetype;
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ADFS_I(inode)->stamped = ((obj->loadaddr & 0xfff00000) == 0xfff00000);
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inode->i_mode = adfs_atts2mode(sb, inode);
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adfs_adfs2unix_time(&inode->i_mtime, inode);
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inode->i_atime = inode->i_mtime;
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inode->i_ctime = inode->i_mtime;
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if (S_ISDIR(inode->i_mode)) {
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inode->i_op = &adfs_dir_inode_operations;
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inode->i_fop = &adfs_dir_operations;
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} else if (S_ISREG(inode->i_mode)) {
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inode->i_op = &adfs_file_inode_operations;
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inode->i_fop = &adfs_file_operations;
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inode->i_mapping->a_ops = &adfs_aops;
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ADFS_I(inode)->mmu_private = inode->i_size;
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}
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insert_inode_hash(inode);
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out:
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return inode;
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}
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/*
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* Validate and convert a changed access mode/time to their ADFS equivalents.
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* adfs_write_inode will actually write the information back to the directory
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* later.
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*/
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int
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adfs_notify_change(struct dentry *dentry, struct iattr *attr)
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{
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struct inode *inode = dentry->d_inode;
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struct super_block *sb = inode->i_sb;
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unsigned int ia_valid = attr->ia_valid;
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int error;
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error = inode_change_ok(inode, attr);
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/*
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* we can't change the UID or GID of any file -
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* we have a global UID/GID in the superblock
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*/
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if ((ia_valid & ATTR_UID && attr->ia_uid != ADFS_SB(sb)->s_uid) ||
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(ia_valid & ATTR_GID && attr->ia_gid != ADFS_SB(sb)->s_gid))
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error = -EPERM;
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if (error)
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goto out;
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/* XXX: this is missing some actual on-disk truncation.. */
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if (ia_valid & ATTR_SIZE)
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truncate_setsize(inode, attr->ia_size);
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if (ia_valid & ATTR_MTIME) {
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inode->i_mtime = attr->ia_mtime;
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adfs_unix2adfs_time(inode, attr->ia_mtime.tv_sec);
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}
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/*
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* FIXME: should we make these == to i_mtime since we don't
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* have the ability to represent them in our filesystem?
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*/
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if (ia_valid & ATTR_ATIME)
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inode->i_atime = attr->ia_atime;
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if (ia_valid & ATTR_CTIME)
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inode->i_ctime = attr->ia_ctime;
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if (ia_valid & ATTR_MODE) {
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ADFS_I(inode)->attr = adfs_mode2atts(sb, inode);
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inode->i_mode = adfs_atts2mode(sb, inode);
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}
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/*
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* FIXME: should we be marking this inode dirty even if
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* we don't have any metadata to write back?
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*/
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if (ia_valid & (ATTR_SIZE | ATTR_MTIME | ATTR_MODE))
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mark_inode_dirty(inode);
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out:
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return error;
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}
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/*
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* write an existing inode back to the directory, and therefore the disk.
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* The adfs-specific inode data has already been updated by
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* adfs_notify_change()
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*/
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int adfs_write_inode(struct inode *inode, struct writeback_control *wbc)
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{
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struct super_block *sb = inode->i_sb;
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struct object_info obj;
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int ret;
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obj.file_id = inode->i_ino;
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obj.name_len = 0;
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obj.parent_id = ADFS_I(inode)->parent_id;
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obj.loadaddr = ADFS_I(inode)->loadaddr;
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obj.execaddr = ADFS_I(inode)->execaddr;
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obj.attr = ADFS_I(inode)->attr;
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obj.size = inode->i_size;
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ret = adfs_dir_update(sb, &obj, wbc->sync_mode == WB_SYNC_ALL);
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return ret;
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}
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