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remarkable-linux/fs/affs/amigaffs.c
Greg Kroah-Hartman b24413180f License cleanup: add SPDX GPL-2.0 license identifier to files with no license 
Many source files in the tree are missing licensing information, which
makes it harder for compliance tools to determine the correct license.

By default all files without license information are under the default
license of the kernel, which is GPL version 2.

Update the files which contain no license information with the 'GPL-2.0'
SPDX license identifier.  The SPDX identifier is a legally binding
shorthand, which can be used instead of the full boiler plate text.

This patch is based on work done by Thomas Gleixner and Kate Stewart and
Philippe Ombredanne.

How this work was done:

Patches were generated and checked against linux-4.14-rc6 for a subset of
the use cases:
 - file had no licensing information it it.
 - file was a */uapi/* one with no licensing information in it,
 - file was a */uapi/* one with existing licensing information,

Further patches will be generated in subsequent months to fix up cases
where non-standard license headers were used, and references to license
had to be inferred by heuristics based on keywords.

The analysis to determine which SPDX License Identifier to be applied to
a file was done in a spreadsheet of side by side results from of the
output of two independent scanners (ScanCode & Windriver) producing SPDX
tag:value files created by Philippe Ombredanne.  Philippe prepared the
base worksheet, and did an initial spot review of a few 1000 files.

The 4.13 kernel was the starting point of the analysis with 60,537 files
assessed.  Kate Stewart did a file by file comparison of the scanner
results in the spreadsheet to determine which SPDX license identifier(s)
to be applied to the file. She confirmed any determination that was not
immediately clear with lawyers working with the Linux Foundation.

Criteria used to select files for SPDX license identifier tagging was:
 - Files considered eligible had to be source code files.
 - Make and config files were included as candidates if they contained >5
   lines of source
 - File already had some variant of a license header in it (even if <5
   lines).

All documentation files were explicitly excluded.

The following heuristics were used to determine which SPDX license
identifiers to apply.

 - when both scanners couldn't find any license traces, file was
   considered to have no license information in it, and the top level
   COPYING file license applied.

   For non */uapi/* files that summary was:

   SPDX license identifier                            # files
   ---------------------------------------------------|-------
   GPL-2.0                                              11139

   and resulted in the first patch in this series.

   If that file was a */uapi/* path one, it was "GPL-2.0 WITH
   Linux-syscall-note" otherwise it was "GPL-2.0".  Results of that was:

   SPDX license identifier                            # files
   ---------------------------------------------------|-------
   GPL-2.0 WITH Linux-syscall-note                        930

   and resulted in the second patch in this series.

 - if a file had some form of licensing information in it, and was one
   of the */uapi/* ones, it was denoted with the Linux-syscall-note if
   any GPL family license was found in the file or had no licensing in
   it (per prior point).  Results summary:

   SPDX license identifier                            # files
   ---------------------------------------------------|------
   GPL-2.0 WITH Linux-syscall-note                       270
   GPL-2.0+ WITH Linux-syscall-note                      169
   ((GPL-2.0 WITH Linux-syscall-note) OR BSD-2-Clause)    21
   ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause)    17
   LGPL-2.1+ WITH Linux-syscall-note                      15
   GPL-1.0+ WITH Linux-syscall-note                       14
   ((GPL-2.0+ WITH Linux-syscall-note) OR BSD-3-Clause)    5
   LGPL-2.0+ WITH Linux-syscall-note                       4
   LGPL-2.1 WITH Linux-syscall-note                        3
   ((GPL-2.0 WITH Linux-syscall-note) OR MIT)              3
   ((GPL-2.0 WITH Linux-syscall-note) AND MIT)             1

   and that resulted in the third patch in this series.

 - when the two scanners agreed on the detected license(s), that became
   the concluded license(s).

 - when there was disagreement between the two scanners (one detected a
   license but the other didn't, or they both detected different
   licenses) a manual inspection of the file occurred.

 - In most cases a manual inspection of the information in the file
   resulted in a clear resolution of the license that should apply (and
   which scanner probably needed to revisit its heuristics).

 - When it was not immediately clear, the license identifier was
   confirmed with lawyers working with the Linux Foundation.

 - If there was any question as to the appropriate license identifier,
   the file was flagged for further research and to be revisited later
   in time.

In total, over 70 hours of logged manual review was done on the
spreadsheet to determine the SPDX license identifiers to apply to the
source files by Kate, Philippe, Thomas and, in some cases, confirmation
by lawyers working with the Linux Foundation.

Kate also obtained a third independent scan of the 4.13 code base from
FOSSology, and compared selected files where the other two scanners
disagreed against that SPDX file, to see if there was new insights.  The
Windriver scanner is based on an older version of FOSSology in part, so
they are related.

Thomas did random spot checks in about 500 files from the spreadsheets
for the uapi headers and agreed with SPDX license identifier in the
files he inspected. For the non-uapi files Thomas did random spot checks
in about 15000 files.

In initial set of patches against 4.14-rc6, 3 files were found to have
copy/paste license identifier errors, and have been fixed to reflect the
correct identifier.

Additionally Philippe spent 10 hours this week doing a detailed manual
inspection and review of the 12,461 patched files from the initial patch
version early this week with:
 - a full scancode scan run, collecting the matched texts, detected
   license ids and scores
 - reviewing anything where there was a license detected (about 500+
   files) to ensure that the applied SPDX license was correct
 - reviewing anything where there was no detection but the patch license
   was not GPL-2.0 WITH Linux-syscall-note to ensure that the applied
   SPDX license was correct

This produced a worksheet with 20 files needing minor correction.  This
worksheet was then exported into 3 different .csv files for the
different types of files to be modified.

These .csv files were then reviewed by Greg.  Thomas wrote a script to
parse the csv files and add the proper SPDX tag to the file, in the
format that the file expected.  This script was further refined by Greg
based on the output to detect more types of files automatically and to
distinguish between header and source .c files (which need different
comment types.)  Finally Greg ran the script using the .csv files to
generate the patches.

Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-11-02 11:10:55 +01:00

516 lines
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// 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 "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);
dir->i_version++;
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);
dir->i_version++;
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 + ((8 * 365 + 2) * 24 * 60 * 60);
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;
if (!(mode & 0100))
prot |= FIBF_NOEXECUTE;
if (!(mode & 0400))
prot |= FIBF_NOREAD;
if (!(mode & 0200))
prot |= FIBF_NOWRITE;
if (mode & 0010)
prot |= FIBF_GRP_EXECUTE;
if (mode & 0040)
prot |= FIBF_GRP_READ;
if (mode & 0020)
prot |= FIBF_GRP_WRITE;
if (mode & 0001)
prot |= FIBF_OTR_EXECUTE;
if (mode & 0004)
prot |= FIBF_OTR_READ;
if (mode & 0002)
prot |= FIBF_OTR_WRITE;
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 |= MS_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;
}
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