Contributors: 23
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Linus Torvalds (pre-git) |
1008 |
66.19% |
11 |
20.37% |
| Russell King |
164 |
10.77% |
7 |
12.96% |
| Linus Torvalds |
65 |
4.27% |
3 |
5.56% |
| Marco Stornelli |
43 |
2.82% |
1 |
1.85% |
| Stuart Swales |
41 |
2.69% |
2 |
3.70% |
| Christoph Hellwig |
41 |
2.69% |
6 |
11.11% |
| Dave Jones |
40 |
2.63% |
1 |
1.85% |
| Nicholas Piggin |
37 |
2.43% |
2 |
3.70% |
| Matthew Wilcox |
14 |
0.92% |
3 |
5.56% |
| Deepa Dinamani |
12 |
0.79% |
2 |
3.70% |
| Andi Kleen |
10 |
0.66% |
1 |
1.85% |
| Eric W. Biedermann |
10 |
0.66% |
1 |
1.85% |
| Andrew Morton |
9 |
0.59% |
2 |
3.70% |
| Christian Brauner |
8 |
0.53% |
2 |
3.70% |
| Miklos Szeredi |
4 |
0.26% |
1 |
1.85% |
| Arnd Bergmann |
4 |
0.26% |
1 |
1.85% |
| David Howells |
3 |
0.20% |
1 |
1.85% |
| Thomas Gleixner |
2 |
0.13% |
1 |
1.85% |
| Jan Kara |
2 |
0.13% |
1 |
1.85% |
| Andrey V. Savochkin |
2 |
0.13% |
1 |
1.85% |
| Al Viro |
2 |
0.13% |
2 |
3.70% |
| Chi Minghao |
1 |
0.07% |
1 |
1.85% |
| Andries E. Brouwer |
1 |
0.07% |
1 |
1.85% |
| Total |
1523 |
|
54 |
|
// SPDX-License-Identifier: GPL-2.0-only
/*
* linux/fs/adfs/inode.c
*
* Copyright (C) 1997-1999 Russell King
*/
#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, ADFS_I(inode)->indaddr,
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_read_folio(struct file *file, struct folio *folio)
{
return block_read_full_folio(folio, 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,
struct page **pagep, void **fsdata)
{
int ret;
*pagep = NULL;
ret = cont_write_begin(file, mapping, pos, len, 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 = {
.dirty_folio = block_dirty_folio,
.invalidate_folio = block_invalidate_folio,
.read_folio = adfs_read_folio,
.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_filetype(ADFS_I(inode)->loadaddr)) {
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 ia_mode)
{
struct adfs_sb_info *asb = ADFS_SB(sb);
umode_t mode;
int attr;
/* FIXME: should we be able to alter a link? */
if (S_ISLNK(inode->i_mode))
return ADFS_I(inode)->attr;
/* Directories do not have read/write permissions on the media */
if (S_ISDIR(inode->i_mode))
return ADFS_NDA_DIRECTORY;
attr = 0;
mode = ia_mode & asb->s_owner_mask;
if (mode & S_IRUGO)
attr |= ADFS_NDA_OWNER_READ;
if (mode & S_IWUGO)
attr |= ADFS_NDA_OWNER_WRITE;
mode = ia_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;
}
static const s64 nsec_unix_epoch_diff_risc_os_epoch = 2208988800000000000LL;
/*
* 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 timespec64 *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)
*/
s64 nsec;
if (!adfs_inode_is_stamped(inode))
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_timespec64(nsec);
return;
cur_time:
*tv = current_time(inode);
return;
too_early:
tv->tv_sec = tv->tv_nsec = 0;
return;
}
/* Convert an Unix time to ADFS time for an entry that is already stamped. */
static void adfs_unix2adfs_time(struct inode *inode,
const struct timespec64 *ts)
{
s64 cs, nsec = timespec64_to_ns(ts);
/* convert from Unix to RISC OS epoch */
nsec += nsec_unix_epoch_diff_risc_os_epoch;
/* convert from nanoseconds to centiseconds */
cs = div_s64(nsec, 10000000);
cs = clamp_t(s64, cs, 0, 0xffffffffff);
ADFS_I(inode)->loadaddr &= ~0xff;
ADFS_I(inode)->loadaddr |= (cs >> 32) & 0xff;
ADFS_I(inode)->execaddr = cs;
}
/*
* 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->indaddr;
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)->indaddr = obj->indaddr;
ADFS_I(inode)->loadaddr = obj->loadaddr;
ADFS_I(inode)->execaddr = obj->execaddr;
ADFS_I(inode)->attr = obj->attr;
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;
}
inode_fake_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 user_namespace *mnt_userns, 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 = setattr_prepare(&init_user_ns, dentry, 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 && adfs_inode_is_stamped(inode)) {
adfs_unix2adfs_time(inode, &attr->ia_mtime);
adfs_adfs2unix_time(&inode->i_mtime, inode);
}
/*
* 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, attr->ia_mode);
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;
obj.indaddr = ADFS_I(inode)->indaddr;
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;
return adfs_dir_update(sb, &obj, wbc->sync_mode == WB_SYNC_ALL);
}