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mirror of https://github.com/edk2-porting/linux-next.git synced 2024-12-23 12:43:55 +08:00
linux-next/fs/nfs/blocklayout/extent_tree.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

648 lines
15 KiB
C

// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2014-2016 Christoph Hellwig.
*/
#include <linux/vmalloc.h>
#include "blocklayout.h"
#define NFSDBG_FACILITY NFSDBG_PNFS_LD
static inline struct pnfs_block_extent *
ext_node(struct rb_node *node)
{
return rb_entry(node, struct pnfs_block_extent, be_node);
}
static struct pnfs_block_extent *
ext_tree_first(struct rb_root *root)
{
struct rb_node *node = rb_first(root);
return node ? ext_node(node) : NULL;
}
static struct pnfs_block_extent *
ext_tree_prev(struct pnfs_block_extent *be)
{
struct rb_node *node = rb_prev(&be->be_node);
return node ? ext_node(node) : NULL;
}
static struct pnfs_block_extent *
ext_tree_next(struct pnfs_block_extent *be)
{
struct rb_node *node = rb_next(&be->be_node);
return node ? ext_node(node) : NULL;
}
static inline sector_t
ext_f_end(struct pnfs_block_extent *be)
{
return be->be_f_offset + be->be_length;
}
static struct pnfs_block_extent *
__ext_tree_search(struct rb_root *root, sector_t start)
{
struct rb_node *node = root->rb_node;
struct pnfs_block_extent *be = NULL;
while (node) {
be = ext_node(node);
if (start < be->be_f_offset)
node = node->rb_left;
else if (start >= ext_f_end(be))
node = node->rb_right;
else
return be;
}
if (be) {
if (start < be->be_f_offset)
return be;
if (start >= ext_f_end(be))
return ext_tree_next(be);
}
return NULL;
}
static bool
ext_can_merge(struct pnfs_block_extent *be1, struct pnfs_block_extent *be2)
{
if (be1->be_state != be2->be_state)
return false;
if (be1->be_device != be2->be_device)
return false;
if (be1->be_f_offset + be1->be_length != be2->be_f_offset)
return false;
if (be1->be_state != PNFS_BLOCK_NONE_DATA &&
(be1->be_v_offset + be1->be_length != be2->be_v_offset))
return false;
if (be1->be_state == PNFS_BLOCK_INVALID_DATA &&
be1->be_tag != be2->be_tag)
return false;
return true;
}
static struct pnfs_block_extent *
ext_try_to_merge_left(struct rb_root *root, struct pnfs_block_extent *be)
{
struct pnfs_block_extent *left = ext_tree_prev(be);
if (left && ext_can_merge(left, be)) {
left->be_length += be->be_length;
rb_erase(&be->be_node, root);
nfs4_put_deviceid_node(be->be_device);
kfree(be);
return left;
}
return be;
}
static struct pnfs_block_extent *
ext_try_to_merge_right(struct rb_root *root, struct pnfs_block_extent *be)
{
struct pnfs_block_extent *right = ext_tree_next(be);
if (right && ext_can_merge(be, right)) {
be->be_length += right->be_length;
rb_erase(&right->be_node, root);
nfs4_put_deviceid_node(right->be_device);
kfree(right);
}
return be;
}
static void __ext_put_deviceids(struct list_head *head)
{
struct pnfs_block_extent *be, *tmp;
list_for_each_entry_safe(be, tmp, head, be_list) {
nfs4_put_deviceid_node(be->be_device);
kfree(be);
}
}
static void
__ext_tree_insert(struct rb_root *root,
struct pnfs_block_extent *new, bool merge_ok)
{
struct rb_node **p = &root->rb_node, *parent = NULL;
struct pnfs_block_extent *be;
while (*p) {
parent = *p;
be = ext_node(parent);
if (new->be_f_offset < be->be_f_offset) {
if (merge_ok && ext_can_merge(new, be)) {
be->be_f_offset = new->be_f_offset;
if (be->be_state != PNFS_BLOCK_NONE_DATA)
be->be_v_offset = new->be_v_offset;
be->be_length += new->be_length;
be = ext_try_to_merge_left(root, be);
goto free_new;
}
p = &(*p)->rb_left;
} else if (new->be_f_offset >= ext_f_end(be)) {
if (merge_ok && ext_can_merge(be, new)) {
be->be_length += new->be_length;
be = ext_try_to_merge_right(root, be);
goto free_new;
}
p = &(*p)->rb_right;
} else {
BUG();
}
}
rb_link_node(&new->be_node, parent, p);
rb_insert_color(&new->be_node, root);
return;
free_new:
nfs4_put_deviceid_node(new->be_device);
kfree(new);
}
static int
__ext_tree_remove(struct rb_root *root,
sector_t start, sector_t end, struct list_head *tmp)
{
struct pnfs_block_extent *be;
sector_t len1 = 0, len2 = 0;
sector_t orig_v_offset;
sector_t orig_len;
be = __ext_tree_search(root, start);
if (!be)
return 0;
if (be->be_f_offset >= end)
return 0;
orig_v_offset = be->be_v_offset;
orig_len = be->be_length;
if (start > be->be_f_offset)
len1 = start - be->be_f_offset;
if (ext_f_end(be) > end)
len2 = ext_f_end(be) - end;
if (len2 > 0) {
if (len1 > 0) {
struct pnfs_block_extent *new;
new = kzalloc(sizeof(*new), GFP_ATOMIC);
if (!new)
return -ENOMEM;
be->be_length = len1;
new->be_f_offset = end;
if (be->be_state != PNFS_BLOCK_NONE_DATA) {
new->be_v_offset =
orig_v_offset + orig_len - len2;
}
new->be_length = len2;
new->be_state = be->be_state;
new->be_tag = be->be_tag;
new->be_device = nfs4_get_deviceid(be->be_device);
__ext_tree_insert(root, new, true);
} else {
be->be_f_offset = end;
if (be->be_state != PNFS_BLOCK_NONE_DATA) {
be->be_v_offset =
orig_v_offset + orig_len - len2;
}
be->be_length = len2;
}
} else {
if (len1 > 0) {
be->be_length = len1;
be = ext_tree_next(be);
}
while (be && ext_f_end(be) <= end) {
struct pnfs_block_extent *next = ext_tree_next(be);
rb_erase(&be->be_node, root);
list_add_tail(&be->be_list, tmp);
be = next;
}
if (be && be->be_f_offset < end) {
len1 = ext_f_end(be) - end;
be->be_f_offset = end;
if (be->be_state != PNFS_BLOCK_NONE_DATA)
be->be_v_offset += be->be_length - len1;
be->be_length = len1;
}
}
return 0;
}
int
ext_tree_insert(struct pnfs_block_layout *bl, struct pnfs_block_extent *new)
{
struct pnfs_block_extent *be;
struct rb_root *root;
int err = 0;
switch (new->be_state) {
case PNFS_BLOCK_READWRITE_DATA:
case PNFS_BLOCK_INVALID_DATA:
root = &bl->bl_ext_rw;
break;
case PNFS_BLOCK_READ_DATA:
case PNFS_BLOCK_NONE_DATA:
root = &bl->bl_ext_ro;
break;
default:
dprintk("invalid extent type\n");
return -EINVAL;
}
spin_lock(&bl->bl_ext_lock);
retry:
be = __ext_tree_search(root, new->be_f_offset);
if (!be || be->be_f_offset >= ext_f_end(new)) {
__ext_tree_insert(root, new, true);
} else if (new->be_f_offset >= be->be_f_offset) {
if (ext_f_end(new) <= ext_f_end(be)) {
nfs4_put_deviceid_node(new->be_device);
kfree(new);
} else {
sector_t new_len = ext_f_end(new) - ext_f_end(be);
sector_t diff = new->be_length - new_len;
new->be_f_offset += diff;
new->be_v_offset += diff;
new->be_length = new_len;
goto retry;
}
} else if (ext_f_end(new) <= ext_f_end(be)) {
new->be_length = be->be_f_offset - new->be_f_offset;
__ext_tree_insert(root, new, true);
} else {
struct pnfs_block_extent *split;
sector_t new_len = ext_f_end(new) - ext_f_end(be);
sector_t diff = new->be_length - new_len;
split = kmemdup(new, sizeof(*new), GFP_ATOMIC);
if (!split) {
err = -EINVAL;
goto out;
}
split->be_length = be->be_f_offset - split->be_f_offset;
split->be_device = nfs4_get_deviceid(new->be_device);
__ext_tree_insert(root, split, true);
new->be_f_offset += diff;
new->be_v_offset += diff;
new->be_length = new_len;
goto retry;
}
out:
spin_unlock(&bl->bl_ext_lock);
return err;
}
static bool
__ext_tree_lookup(struct rb_root *root, sector_t isect,
struct pnfs_block_extent *ret)
{
struct rb_node *node;
struct pnfs_block_extent *be;
node = root->rb_node;
while (node) {
be = ext_node(node);
if (isect < be->be_f_offset)
node = node->rb_left;
else if (isect >= ext_f_end(be))
node = node->rb_right;
else {
*ret = *be;
return true;
}
}
return false;
}
bool
ext_tree_lookup(struct pnfs_block_layout *bl, sector_t isect,
struct pnfs_block_extent *ret, bool rw)
{
bool found = false;
spin_lock(&bl->bl_ext_lock);
if (!rw)
found = __ext_tree_lookup(&bl->bl_ext_ro, isect, ret);
if (!found)
found = __ext_tree_lookup(&bl->bl_ext_rw, isect, ret);
spin_unlock(&bl->bl_ext_lock);
return found;
}
int ext_tree_remove(struct pnfs_block_layout *bl, bool rw,
sector_t start, sector_t end)
{
int err, err2;
LIST_HEAD(tmp);
spin_lock(&bl->bl_ext_lock);
err = __ext_tree_remove(&bl->bl_ext_ro, start, end, &tmp);
if (rw) {
err2 = __ext_tree_remove(&bl->bl_ext_rw, start, end, &tmp);
if (!err)
err = err2;
}
spin_unlock(&bl->bl_ext_lock);
__ext_put_deviceids(&tmp);
return err;
}
static int
ext_tree_split(struct rb_root *root, struct pnfs_block_extent *be,
sector_t split)
{
struct pnfs_block_extent *new;
sector_t orig_len = be->be_length;
new = kzalloc(sizeof(*new), GFP_ATOMIC);
if (!new)
return -ENOMEM;
be->be_length = split - be->be_f_offset;
new->be_f_offset = split;
if (be->be_state != PNFS_BLOCK_NONE_DATA)
new->be_v_offset = be->be_v_offset + be->be_length;
new->be_length = orig_len - be->be_length;
new->be_state = be->be_state;
new->be_tag = be->be_tag;
new->be_device = nfs4_get_deviceid(be->be_device);
__ext_tree_insert(root, new, false);
return 0;
}
int
ext_tree_mark_written(struct pnfs_block_layout *bl, sector_t start,
sector_t len, u64 lwb)
{
struct rb_root *root = &bl->bl_ext_rw;
sector_t end = start + len;
struct pnfs_block_extent *be;
int err = 0;
LIST_HEAD(tmp);
spin_lock(&bl->bl_ext_lock);
/*
* First remove all COW extents or holes from written to range.
*/
err = __ext_tree_remove(&bl->bl_ext_ro, start, end, &tmp);
if (err)
goto out;
/*
* Then mark all invalid extents in the range as written to.
*/
for (be = __ext_tree_search(root, start); be; be = ext_tree_next(be)) {
if (be->be_f_offset >= end)
break;
if (be->be_state != PNFS_BLOCK_INVALID_DATA || be->be_tag)
continue;
if (be->be_f_offset < start) {
struct pnfs_block_extent *left = ext_tree_prev(be);
if (left && ext_can_merge(left, be)) {
sector_t diff = start - be->be_f_offset;
left->be_length += diff;
be->be_f_offset += diff;
be->be_v_offset += diff;
be->be_length -= diff;
} else {
err = ext_tree_split(root, be, start);
if (err)
goto out;
}
}
if (ext_f_end(be) > end) {
struct pnfs_block_extent *right = ext_tree_next(be);
if (right && ext_can_merge(be, right)) {
sector_t diff = end - be->be_f_offset;
be->be_length -= diff;
right->be_f_offset -= diff;
right->be_v_offset -= diff;
right->be_length += diff;
} else {
err = ext_tree_split(root, be, end);
if (err)
goto out;
}
}
if (be->be_f_offset >= start && ext_f_end(be) <= end) {
be->be_tag = EXTENT_WRITTEN;
be = ext_try_to_merge_left(root, be);
be = ext_try_to_merge_right(root, be);
}
}
out:
if (bl->bl_lwb < lwb)
bl->bl_lwb = lwb;
spin_unlock(&bl->bl_ext_lock);
__ext_put_deviceids(&tmp);
return err;
}
static size_t ext_tree_layoutupdate_size(struct pnfs_block_layout *bl, size_t count)
{
if (bl->bl_scsi_layout)
return sizeof(__be32) + PNFS_SCSI_RANGE_SIZE * count;
else
return sizeof(__be32) + PNFS_BLOCK_EXTENT_SIZE * count;
}
static void ext_tree_free_commitdata(struct nfs4_layoutcommit_args *arg,
size_t buffer_size)
{
if (arg->layoutupdate_pages != &arg->layoutupdate_page) {
int nr_pages = DIV_ROUND_UP(buffer_size, PAGE_SIZE), i;
for (i = 0; i < nr_pages; i++)
put_page(arg->layoutupdate_pages[i]);
vfree(arg->start_p);
kfree(arg->layoutupdate_pages);
} else {
put_page(arg->layoutupdate_page);
}
}
static __be32 *encode_block_extent(struct pnfs_block_extent *be, __be32 *p)
{
p = xdr_encode_opaque_fixed(p, be->be_device->deviceid.data,
NFS4_DEVICEID4_SIZE);
p = xdr_encode_hyper(p, be->be_f_offset << SECTOR_SHIFT);
p = xdr_encode_hyper(p, be->be_length << SECTOR_SHIFT);
p = xdr_encode_hyper(p, 0LL);
*p++ = cpu_to_be32(PNFS_BLOCK_READWRITE_DATA);
return p;
}
static __be32 *encode_scsi_range(struct pnfs_block_extent *be, __be32 *p)
{
p = xdr_encode_hyper(p, be->be_f_offset << SECTOR_SHIFT);
return xdr_encode_hyper(p, be->be_length << SECTOR_SHIFT);
}
static int ext_tree_encode_commit(struct pnfs_block_layout *bl, __be32 *p,
size_t buffer_size, size_t *count, __u64 *lastbyte)
{
struct pnfs_block_extent *be;
int ret = 0;
spin_lock(&bl->bl_ext_lock);
for (be = ext_tree_first(&bl->bl_ext_rw); be; be = ext_tree_next(be)) {
if (be->be_state != PNFS_BLOCK_INVALID_DATA ||
be->be_tag != EXTENT_WRITTEN)
continue;
(*count)++;
if (ext_tree_layoutupdate_size(bl, *count) > buffer_size) {
/* keep counting.. */
ret = -ENOSPC;
continue;
}
if (bl->bl_scsi_layout)
p = encode_scsi_range(be, p);
else
p = encode_block_extent(be, p);
be->be_tag = EXTENT_COMMITTING;
}
*lastbyte = bl->bl_lwb - 1;
bl->bl_lwb = 0;
spin_unlock(&bl->bl_ext_lock);
return ret;
}
int
ext_tree_prepare_commit(struct nfs4_layoutcommit_args *arg)
{
struct pnfs_block_layout *bl = BLK_LO2EXT(NFS_I(arg->inode)->layout);
size_t count = 0, buffer_size = PAGE_SIZE;
__be32 *start_p;
int ret;
dprintk("%s enter\n", __func__);
arg->layoutupdate_page = alloc_page(GFP_NOFS);
if (!arg->layoutupdate_page)
return -ENOMEM;
start_p = page_address(arg->layoutupdate_page);
arg->layoutupdate_pages = &arg->layoutupdate_page;
retry:
ret = ext_tree_encode_commit(bl, start_p + 1, buffer_size, &count, &arg->lastbytewritten);
if (unlikely(ret)) {
ext_tree_free_commitdata(arg, buffer_size);
buffer_size = ext_tree_layoutupdate_size(bl, count);
count = 0;
arg->layoutupdate_pages =
kcalloc(DIV_ROUND_UP(buffer_size, PAGE_SIZE),
sizeof(struct page *), GFP_NOFS);
if (!arg->layoutupdate_pages)
return -ENOMEM;
start_p = __vmalloc(buffer_size, GFP_NOFS, PAGE_KERNEL);
if (!start_p) {
kfree(arg->layoutupdate_pages);
return -ENOMEM;
}
goto retry;
}
*start_p = cpu_to_be32(count);
arg->layoutupdate_len = ext_tree_layoutupdate_size(bl, count);
if (unlikely(arg->layoutupdate_pages != &arg->layoutupdate_page)) {
void *p = start_p, *end = p + arg->layoutupdate_len;
struct page *page = NULL;
int i = 0;
arg->start_p = start_p;
for ( ; p < end; p += PAGE_SIZE) {
page = vmalloc_to_page(p);
arg->layoutupdate_pages[i++] = page;
get_page(page);
}
}
dprintk("%s found %zu ranges\n", __func__, count);
return 0;
}
void
ext_tree_mark_committed(struct nfs4_layoutcommit_args *arg, int status)
{
struct pnfs_block_layout *bl = BLK_LO2EXT(NFS_I(arg->inode)->layout);
struct rb_root *root = &bl->bl_ext_rw;
struct pnfs_block_extent *be;
dprintk("%s status %d\n", __func__, status);
ext_tree_free_commitdata(arg, arg->layoutupdate_len);
spin_lock(&bl->bl_ext_lock);
for (be = ext_tree_first(root); be; be = ext_tree_next(be)) {
if (be->be_state != PNFS_BLOCK_INVALID_DATA ||
be->be_tag != EXTENT_COMMITTING)
continue;
if (status) {
/*
* Mark as written and try again.
*
* XXX: some real error handling here wouldn't hurt..
*/
be->be_tag = EXTENT_WRITTEN;
} else {
be->be_state = PNFS_BLOCK_READWRITE_DATA;
be->be_tag = 0;
}
be = ext_try_to_merge_left(root, be);
be = ext_try_to_merge_right(root, be);
}
spin_unlock(&bl->bl_ext_lock);
}