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ANDROID: Revert fs/squashfs back to linux-4.14.y

Browse Source 
Bug: 29521202
Test: local build test only
Change-Id: I117e6e733f0ece85fd4d90604efc4d59fa545464
Signed-off-by: Alistair Strachan <astrachan@google.com>
This commit is contained in:
Alistair Strachan 2018-12-19 15:37:41 -08:00
parent 2eaa69bd84
commit e9c7ae0eb4
17 changed files with 643 additions and 897 deletions
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28
fs/squashfs/Kconfig
View File

@ -25,6 +25,34 @@ config SQUASHFS
If unsure, say N.
choice
prompt "File decompression options"
depends on SQUASHFS
help
Squashfs now supports two options for decompressing file
data. Traditionally Squashfs has decompressed into an
intermediate buffer and then memcopied it into the page cache.
Squashfs now supports the ability to decompress directly into
the page cache.
If unsure, select "Decompress file data into an intermediate buffer"
config SQUASHFS_FILE_CACHE
bool "Decompress file data into an intermediate buffer"
help
Decompress file data into an intermediate buffer and then
memcopy it into the page cache.
config SQUASHFS_FILE_DIRECT
bool "Decompress files directly into the page cache"
help
Directly decompress file data into the page cache.
Doing so can significantly improve performance because
it eliminates a memcpy and it also removes the lock contention
on the single buffer.
endchoice
choice
prompt "Decompressor parallelisation options"
depends on SQUASHFS

3
fs/squashfs/Makefile
View File

@ -6,7 +6,8 @@
obj-$(CONFIG_SQUASHFS) += squashfs.o
squashfs-y += block.o cache.o dir.o export.o file.o fragment.o id.o inode.o
squashfs-y += namei.o super.o symlink.o decompressor.o
squashfs-y += file_direct.o page_actor.o
squashfs-$(CONFIG_SQUASHFS_FILE_CACHE) += file_cache.o
squashfs-$(CONFIG_SQUASHFS_FILE_DIRECT) += file_direct.o page_actor.o
squashfs-$(CONFIG_SQUASHFS_DECOMP_SINGLE) += decompressor_single.o
squashfs-$(CONFIG_SQUASHFS_DECOMP_MULTI) += decompressor_multi.o
squashfs-$(CONFIG_SQUASHFS_DECOMP_MULTI_PERCPU) += decompressor_multi_percpu.o

558
fs/squashfs/block.c
View File

@ -28,13 +28,10 @@
#include <linux/fs.h>
#include <linux/vfs.h>
#include <linux/bio.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/pagemap.h>
#include <linux/buffer_head.h>
#include <linux/bio.h>
#include <linux/workqueue.h>
#include "squashfs_fs.h"
#include "squashfs_fs_sb.h"
@ -42,382 +39,45 @@
#include "decompressor.h"
#include "page_actor.h"
static struct workqueue_struct *squashfs_read_wq;
struct squashfs_read_request {
struct super_block *sb;
u64 index;
int length;
int compressed;
int offset;
u64 read_end;
struct squashfs_page_actor *output;
enum {
SQUASHFS_COPY,
SQUASHFS_DECOMPRESS,
SQUASHFS_METADATA,
} data_processing;
bool synchronous;
/*
* If the read is synchronous, it is possible to retrieve information
* about the request by setting these pointers.
/*
* Read the metadata block length, this is stored in the first two
* bytes of the metadata block.
*/
int *res;
int *bytes_read;
int *bytes_uncompressed;
int nr_buffers;
struct buffer_head **bh;
struct work_struct offload;
};
struct squashfs_bio_request {
struct buffer_head **bh;
int nr_buffers;
};
static int squashfs_bio_submit(struct squashfs_read_request *req);
int squashfs_init_read_wq(void)
static struct buffer_head *get_block_length(struct super_block *sb,
u64 *cur_index, int *offset, int *length)
{
squashfs_read_wq = create_workqueue("SquashFS read wq");
return !!squashfs_read_wq;
}
void squashfs_destroy_read_wq(void)
{
flush_workqueue(squashfs_read_wq);
destroy_workqueue(squashfs_read_wq);
}
static void free_read_request(struct squashfs_read_request *req, int error)
{
if (!req->synchronous)
squashfs_page_actor_free(req->output, error);
if (req->res)
*(req->res) = error;
kfree(req->bh);
kfree(req);
}
static void squashfs_process_blocks(struct squashfs_read_request *req)
{
int error = 0;
int bytes, i, length;
struct squashfs_sb_info *msblk = req->sb->s_fs_info;
struct squashfs_page_actor *actor = req->output;
struct buffer_head **bh = req->bh;
int nr_buffers = req->nr_buffers;
for (i = 0; i < nr_buffers; ++i) {
if (!bh[i])
continue;
wait_on_buffer(bh[i]);
if (!buffer_uptodate(bh[i]))
error = -EIO;
}
if (error)
goto cleanup;
if (req->data_processing == SQUASHFS_METADATA) {
/* Extract the length of the metadata block */
if (req->offset != msblk->devblksize - 1) {
length = le16_to_cpup((__le16 *)
(bh[0]->b_data + req->offset));
} else {
length = (unsigned char)bh[0]->b_data[req->offset];
length |= (unsigned char)bh[1]->b_data[0] << 8;
}
req->compressed = SQUASHFS_COMPRESSED(length);
req->data_processing = req->compressed ? SQUASHFS_DECOMPRESS
: SQUASHFS_COPY;
length = SQUASHFS_COMPRESSED_SIZE(length);
if (req->index + length + 2 > req->read_end) {
for (i = 0; i < nr_buffers; ++i)
put_bh(bh[i]);
kfree(bh);
req->length = length;
req->index += 2;
squashfs_bio_submit(req);
return;
}
req->length = length;
req->offset = (req->offset + 2) % PAGE_SIZE;
if (req->offset < 2) {
put_bh(bh[0]);
++bh;
--nr_buffers;
}
}
if (req->bytes_read)
*(req->bytes_read) = req->length;
if (req->data_processing == SQUASHFS_COPY) {
squashfs_bh_to_actor(bh, nr_buffers, req->output, req->offset,
req->length, msblk->devblksize);
} else if (req->data_processing == SQUASHFS_DECOMPRESS) {
req->length = squashfs_decompress(msblk, bh, nr_buffers,
req->offset, req->length, actor);
if (req->length < 0) {
error = -EIO;
goto cleanup;
}
}
/* Last page may have trailing bytes not filled */
bytes = req->length % PAGE_SIZE;
if (bytes && actor->page[actor->pages - 1])
zero_user_segment(actor->page[actor->pages - 1], bytes,
PAGE_SIZE);
cleanup:
if (req->bytes_uncompressed)
*(req->bytes_uncompressed) = req->length;
if (error) {
for (i = 0; i < nr_buffers; ++i)
if (bh[i])
put_bh(bh[i]);
}
free_read_request(req, error);
}
static void read_wq_handler(struct work_struct *work)
{
squashfs_process_blocks(container_of(work,
struct squashfs_read_request, offload));
}
static void squashfs_bio_end_io(struct bio *bio)
{
int i;
blk_status_t error = bio->bi_status;
struct squashfs_bio_request *bio_req = bio->bi_private;
bio_put(bio);
for (i = 0; i < bio_req->nr_buffers; ++i) {
if (!bio_req->bh[i])
continue;
if (!error)
set_buffer_uptodate(bio_req->bh[i]);
else
clear_buffer_uptodate(bio_req->bh[i]);
unlock_buffer(bio_req->bh[i]);
}
kfree(bio_req);
}
static int bh_is_optional(struct squashfs_read_request *req, int idx)
{
int start_idx, end_idx;
struct squashfs_sb_info *msblk = req->sb->s_fs_info;
start_idx = (idx * msblk->devblksize - req->offset) >> PAGE_SHIFT;
end_idx = ((idx + 1) * msblk->devblksize - req->offset + 1) >> PAGE_SHIFT;
if (start_idx >= req->output->pages)
return 1;
if (start_idx < 0)
start_idx = end_idx;
if (end_idx >= req->output->pages)
end_idx = start_idx;
return !req->output->page[start_idx] && !req->output->page[end_idx];
}
static int actor_getblks(struct squashfs_read_request *req, u64 block)
{
int i;
req->bh = kmalloc_array(req->nr_buffers, sizeof(*(req->bh)), GFP_NOIO);
if (!req->bh)
return -ENOMEM;
for (i = 0; i < req->nr_buffers; ++i) {
/*
* When dealing with an uncompressed block, the actor may
* contains NULL pages. There's no need to read the buffers
* associated with these pages.
*/
if (!req->compressed && bh_is_optional(req, i)) {
req->bh[i] = NULL;
continue;
}
req->bh[i] = sb_getblk(req->sb, block + i);
if (!req->bh[i]) {
while (--i) {
if (req->bh[i])
put_bh(req->bh[i]);
}
return -1;
}
}
return 0;
}
static int squashfs_bio_submit(struct squashfs_read_request *req)
{
struct bio *bio = NULL;
struct squashfs_sb_info *msblk = sb->s_fs_info;
struct buffer_head *bh;
struct squashfs_bio_request *bio_req = NULL;
int b = 0, prev_block = 0;
struct squashfs_sb_info *msblk = req->sb->s_fs_info;
u64 read_start = round_down(req->index, msblk->devblksize);
u64 read_end = round_up(req->index + req->length, msblk->devblksize);
sector_t block = read_start >> msblk->devblksize_log2;
sector_t block_end = read_end >> msblk->devblksize_log2;
int offset = read_start - round_down(req->index, PAGE_SIZE);
int nr_buffers = block_end - block;
int blksz = msblk->devblksize;
int bio_max_pages = nr_buffers > BIO_MAX_PAGES ? BIO_MAX_PAGES
: nr_buffers;
bh = sb_bread(sb, *cur_index);
if (bh == NULL)
return NULL;
/* Setup the request */
req->read_end = read_end;
req->offset = req->index - read_start;
req->nr_buffers = nr_buffers;
if (actor_getblks(req, block) < 0)
goto getblk_failed;
if (msblk->devblksize - *offset == 1) {
*length = (unsigned char) bh->b_data[*offset];
put_bh(bh);
bh = sb_bread(sb, ++(*cur_index));
if (bh == NULL)
return NULL;
*length |= (unsigned char) bh->b_data[0] << 8;
*offset = 1;
} else {
*length = (unsigned char) bh->b_data[*offset] |
(unsigned char) bh->b_data[*offset + 1] << 8;
*offset += 2;
/* Create and submit the BIOs */
for (b = 0; b < nr_buffers; ++b, offset += blksz) {
bh = req->bh[b];
if (!bh || !trylock_buffer(bh))
continue;
if (buffer_uptodate(bh)) {
unlock_buffer(bh);
continue;
}
offset %= PAGE_SIZE;
/* Append the buffer to the current BIO if it is contiguous */
if (bio && bio_req && prev_block + 1 == b) {
if (bio_add_page(bio, bh->b_page, blksz, offset)) {
bio_req->nr_buffers += 1;
prev_block = b;
continue;
if (*offset == msblk->devblksize) {
put_bh(bh);
bh = sb_bread(sb, ++(*cur_index));
if (bh == NULL)
return NULL;
*offset = 0;
}
}
/* Otherwise, submit the current BIO and create a new one */
if (bio)
submit_bio(bio);
bio_req = kcalloc(1, sizeof(struct squashfs_bio_request),
GFP_NOIO);
if (!bio_req)
goto req_alloc_failed;
bio_req->bh = &req->bh[b];
bio = bio_alloc(GFP_NOIO, bio_max_pages);
if (!bio)
goto bio_alloc_failed;
bio_set_dev(bio, req->sb->s_bdev);
bio->bi_iter.bi_sector = (block + b)
<< (msblk->devblksize_log2 - 9);
bio_set_op_attrs(bio, REQ_OP_READ, 0);
bio->bi_private = bio_req;
bio->bi_end_io = squashfs_bio_end_io;
bio_add_page(bio, bh->b_page, blksz, offset);
bio_req->nr_buffers += 1;
prev_block = b;
}
if (bio)
submit_bio(bio);
if (req->synchronous)
squashfs_process_blocks(req);
else {
INIT_WORK(&req->offload, read_wq_handler);
schedule_work(&req->offload);
}
return 0;
bio_alloc_failed:
kfree(bio_req);
req_alloc_failed:
unlock_buffer(bh);
while (--nr_buffers >= b)
if (req->bh[nr_buffers])
put_bh(req->bh[nr_buffers]);
while (--b >= 0)
if (req->bh[b])
wait_on_buffer(req->bh[b]);
getblk_failed:
free_read_request(req, -ENOMEM);
return -ENOMEM;
return bh;
}
static int read_metadata_block(struct squashfs_read_request *req,
u64 *next_index)
{
int ret, error, bytes_read = 0, bytes_uncompressed = 0;
struct squashfs_sb_info *msblk = req->sb->s_fs_info;
if (req->index + 2 > msblk->bytes_used) {
free_read_request(req, -EINVAL);
return -EINVAL;
}
req->length = 2;
/* Do not read beyond the end of the device */
if (req->index + req->length > msblk->bytes_used)
req->length = msblk->bytes_used - req->index;
req->data_processing = SQUASHFS_METADATA;
/*
* Reading metadata is always synchronous because we don't know the
* length in advance and the function is expected to update
* 'next_index' and return the length.
*/
req->synchronous = true;
req->res = &error;
req->bytes_read = &bytes_read;
req->bytes_uncompressed = &bytes_uncompressed;
TRACE("Metadata block @ 0x%llx, %scompressed size %d, src size %d\n",
req->index, req->compressed ? "" : "un", bytes_read,
req->output->length);
ret = squashfs_bio_submit(req);
if (ret)
return ret;
if (error)
return error;
if (next_index)
*next_index += 2 + bytes_read;
return bytes_uncompressed;
}
static int read_data_block(struct squashfs_read_request *req, int length,
u64 *next_index, bool synchronous)
{
int ret, error = 0, bytes_uncompressed = 0, bytes_read = 0;
req->compressed = SQUASHFS_COMPRESSED_BLOCK(length);
req->length = length = SQUASHFS_COMPRESSED_SIZE_BLOCK(length);
req->data_processing = req->compressed ? SQUASHFS_DECOMPRESS
: SQUASHFS_COPY;
req->synchronous = synchronous;
if (synchronous) {
req->res = &error;
req->bytes_read = &bytes_read;
req->bytes_uncompressed = &bytes_uncompressed;
}
TRACE("Data block @ 0x%llx, %scompressed size %d, src size %d\n",
req->index, req->compressed ? "" : "un", req->length,
req->output->length);
ret = squashfs_bio_submit(req);
if (ret)
return ret;
if (synchronous)
ret = error ? error : bytes_uncompressed;
if (next_index)
*next_index += length;
return ret;
}
/*
* Read and decompress a metadata block or datablock. Length is non-zero
@ -428,50 +88,130 @@ static int read_data_block(struct squashfs_read_request *req, int length,
* generated a larger block - this does occasionally happen with compression
* algorithms).
*/
static int __squashfs_read_data(struct super_block *sb, u64 index, int length,
u64 *next_index, struct squashfs_page_actor *output, bool sync)
{
struct squashfs_read_request *req;
req = kcalloc(1, sizeof(struct squashfs_read_request), GFP_KERNEL);
if (!req) {
if (!sync)
squashfs_page_actor_free(output, -ENOMEM);
return -ENOMEM;
}
req->sb = sb;
req->index = index;
req->output = output;
if (next_index)
*next_index = index;
if (length)
length = read_data_block(req, length, next_index, sync);
else
length = read_metadata_block(req, next_index);
if (length < 0) {
ERROR("squashfs_read_data failed to read block 0x%llx\n",
(unsigned long long)index);
return -EIO;
}
return length;
}
int squashfs_read_data(struct super_block *sb, u64 index, int length,
u64 *next_index, struct squashfs_page_actor *output)
{
return __squashfs_read_data(sb, index, length, next_index, output,
true);
}
struct squashfs_sb_info *msblk = sb->s_fs_info;
struct buffer_head **bh;
int offset = index & ((1 << msblk->devblksize_log2) - 1);
u64 cur_index = index >> msblk->devblksize_log2;
int bytes, compressed, b = 0, k = 0, avail, i;
int squashfs_read_data_async(struct super_block *sb, u64 index, int length,
u64 *next_index, struct squashfs_page_actor *output)
{
bh = kcalloc(((output->length + msblk->devblksize - 1)
>> msblk->devblksize_log2) + 1, sizeof(*bh), GFP_KERNEL);
if (bh == NULL)
return -ENOMEM;
return __squashfs_read_data(sb, index, length, next_index, output,
false);
if (length) {
/*
* Datablock.
*/
bytes = -offset;
compressed = SQUASHFS_COMPRESSED_BLOCK(length);
length = SQUASHFS_COMPRESSED_SIZE_BLOCK(length);
if (next_index)
*next_index = index + length;
TRACE("Block @ 0x%llx, %scompressed size %d, src size %d\n",
index, compressed ? "" : "un", length, output->length);
if (length < 0 || length > output->length ||
(index + length) > msblk->bytes_used)
goto read_failure;
for (b = 0; bytes < length; b++, cur_index++) {
bh[b] = sb_getblk(sb, cur_index);
if (bh[b] == NULL)
goto block_release;
bytes += msblk->devblksize;
}
ll_rw_block(REQ_OP_READ, 0, b, bh);
} else {
/*
* Metadata block.
*/
if ((index + 2) > msblk->bytes_used)
goto read_failure;
bh[0] = get_block_length(sb, &cur_index, &offset, &length);
if (bh[0] == NULL)
goto read_failure;
b = 1;
bytes = msblk->devblksize - offset;
compressed = SQUASHFS_COMPRESSED(length);
length = SQUASHFS_COMPRESSED_SIZE(length);
if (next_index)
*next_index = index + length + 2;
TRACE("Block @ 0x%llx, %scompressed size %d\n", index,
compressed ? "" : "un", length);
if (length < 0 || length > output->length ||
(index + length) > msblk->bytes_used)
goto block_release;
for (; bytes < length; b++) {
bh[b] = sb_getblk(sb, ++cur_index);
if (bh[b] == NULL)
goto block_release;
bytes += msblk->devblksize;
}
ll_rw_block(REQ_OP_READ, 0, b - 1, bh + 1);
}
for (i = 0; i < b; i++) {
wait_on_buffer(bh[i]);
if (!buffer_uptodate(bh[i]))
goto block_release;
}
if (compressed) {
if (!msblk->stream)
goto read_failure;
length = squashfs_decompress(msblk, bh, b, offset, length,
output);
if (length < 0)
goto read_failure;
} else {
/*
* Block is uncompressed.
*/
int in, pg_offset = 0;
void *data = squashfs_first_page(output);
for (bytes = length; k < b; k++) {
in = min(bytes, msblk->devblksize - offset);
bytes -= in;
while (in) {
if (pg_offset == PAGE_SIZE) {
data = squashfs_next_page(output);
pg_offset = 0;
}
avail = min_t(int, in, PAGE_SIZE -
pg_offset);
memcpy(data + pg_offset, bh[k]->b_data + offset,
avail);
in -= avail;
pg_offset += avail;
offset += avail;
}
offset = 0;
put_bh(bh[k]);
}
squashfs_finish_page(output);
}
kfree(bh);
return length;
block_release:
for (; k < b; k++)
put_bh(bh[k]);
read_failure:
ERROR("squashfs_read_data failed to read block 0x%llx\n",
(unsigned long long) index);
kfree(bh);
return -EIO;
}

73
fs/squashfs/cache.c
View File

@ -209,14 +209,17 @@ void squashfs_cache_put(struct squashfs_cache_entry *entry)
*/
void squashfs_cache_delete(struct squashfs_cache *cache)
{
int i;
int i, j;
if (cache == NULL)
return;
for (i = 0; i < cache->entries; i++) {
if (cache->entry[i].page)
free_page_array(cache->entry[i].page, cache->pages);
if (cache->entry[i].data) {
for (j = 0; j < cache->pages; j++)
kfree(cache->entry[i].data[j]);
kfree(cache->entry[i].data);
}
kfree(cache->entry[i].actor);
}
@ -233,7 +236,7 @@ void squashfs_cache_delete(struct squashfs_cache *cache)
struct squashfs_cache *squashfs_cache_init(char *name, int entries,
int block_size)
{
int i;
int i, j;
struct squashfs_cache *cache = kzalloc(sizeof(*cache), GFP_KERNEL);
if (cache == NULL) {
@ -265,13 +268,22 @@ struct squashfs_cache *squashfs_cache_init(char *name, int entries,
init_waitqueue_head(&cache->entry[i].wait_queue);
entry->cache = cache;
entry->block = SQUASHFS_INVALID_BLK;
entry->page = alloc_page_array(cache->pages, GFP_KERNEL);
if (!entry->page) {
entry->data = kcalloc(cache->pages, sizeof(void *), GFP_KERNEL);
if (entry->data == NULL) {
ERROR("Failed to allocate %s cache entry\n", name);
goto cleanup;
}
entry->actor = squashfs_page_actor_init(entry->page,
cache->pages, 0, NULL);
for (j = 0; j < cache->pages; j++) {
entry->data[j] = kmalloc(PAGE_SIZE, GFP_KERNEL);
if (entry->data[j] == NULL) {
ERROR("Failed to allocate %s buffer\n", name);
goto cleanup;
}
}
entry->actor = squashfs_page_actor_init(entry->data,
cache->pages, 0);
if (entry->actor == NULL) {
ERROR("Failed to allocate %s cache entry\n", name);
goto cleanup;
@ -302,20 +314,18 @@ int squashfs_copy_data(void *buffer, struct squashfs_cache_entry *entry,
return min(length, entry->length - offset);
while (offset < entry->length) {
void *buff = kmap_atomic(entry->page[offset / PAGE_SIZE])
void *buff = entry->data[offset / PAGE_SIZE]
+ (offset % PAGE_SIZE);
int bytes = min_t(int, entry->length - offset,
PAGE_SIZE - (offset % PAGE_SIZE));
if (bytes >= remaining) {
memcpy(buffer, buff, remaining);
kunmap_atomic(buff);
remaining = 0;
break;
}
memcpy(buffer, buff, bytes);
kunmap_atomic(buff);
buffer += bytes;
remaining -= bytes;
offset += bytes;
@ -409,38 +419,43 @@ struct squashfs_cache_entry *squashfs_get_datablock(struct super_block *sb,
void *squashfs_read_table(struct super_block *sb, u64 block, int length)
{
int pages = (length + PAGE_SIZE - 1) >> PAGE_SHIFT;
struct page **page;
void *buff;
int res;
int i, res;
void *table, *buffer, **data;
struct squashfs_page_actor *actor;
page = alloc_page_array(pages, GFP_KERNEL);
if (!page)
table = buffer = kmalloc(length, GFP_KERNEL);
if (table == NULL)
return ERR_PTR(-ENOMEM);
actor = squashfs_page_actor_init(page, pages, length, NULL);
if (actor == NULL) {
data = kcalloc(pages, sizeof(void *), GFP_KERNEL);
if (data == NULL) {
res = -ENOMEM;
goto failed;
}
actor = squashfs_page_actor_init(data, pages, length);
if (actor == NULL) {
res = -ENOMEM;
goto failed2;
}
for (i = 0; i < pages; i++, buffer += PAGE_SIZE)
data[i] = buffer;
res = squashfs_read_data(sb, block, length |
SQUASHFS_COMPRESSED_BIT_BLOCK, NULL, actor);
if (res < 0)
goto failed2;
kfree(data);
kfree(actor);
buff = kmalloc(length, GFP_KERNEL);
if (!buff)
goto failed2;
squashfs_actor_to_buf(actor, buff, length);
squashfs_page_actor_free(actor, 0);
free_page_array(page, pages);
return buff;
if (res < 0)
goto failed;
return table;
failed2:
squashfs_page_actor_free(actor, 0);
kfree(data);
failed:
free_page_array(page, pages);
kfree(table);
return ERR_PTR(res);
}

35
fs/squashfs/decompressor.c
View File

@ -24,8 +24,7 @@
#include <linux/types.h>
#include <linux/mutex.h>
#include <linux/slab.h>
#include <linux/highmem.h>
#include <linux/fs.h>
#include <linux/buffer_head.h>
#include "squashfs_fs.h"
#include "squashfs_fs_sb.h"
@ -102,26 +101,24 @@ const struct squashfs_decompressor *squashfs_lookup_decompressor(int id)
static void *get_comp_opts(struct super_block *sb, unsigned short flags)
{
struct squashfs_sb_info *msblk = sb->s_fs_info;
void *comp_opts, *buffer = NULL;
struct page *page;
void *buffer = NULL, *comp_opts;
struct squashfs_page_actor *actor = NULL;
int length = 0;
if (!SQUASHFS_COMP_OPTS(flags))
return squashfs_comp_opts(msblk, buffer, length);
/*
* Read decompressor specific options from file system if present
*/
if (SQUASHFS_COMP_OPTS(flags)) {
buffer = kmalloc(PAGE_SIZE, GFP_KERNEL);
if (buffer == NULL) {
comp_opts = ERR_PTR(-ENOMEM);
goto out;
}
page = alloc_page(GFP_KERNEL);
if (!page)
return ERR_PTR(-ENOMEM);
actor = squashfs_page_actor_init(&page, 1, 0, NULL);
actor = squashfs_page_actor_init(&buffer, 1, 0);
if (actor == NULL) {
comp_opts = ERR_PTR(-ENOMEM);
goto actor_error;
goto out;
}
length = squashfs_read_data(sb,
@ -129,17 +126,15 @@ static void *get_comp_opts(struct super_block *sb, unsigned short flags)
if (length < 0) {
comp_opts = ERR_PTR(length);
goto read_error;
goto out;
}
}
buffer = kmap_atomic(page);
comp_opts = squashfs_comp_opts(msblk, buffer, length);
kunmap_atomic(buffer);
read_error:
squashfs_page_actor_free(actor, 0);
actor_error:
__free_page(page);
out:
kfree(actor);
kfree(buffer);
return comp_opts;
}

125
fs/squashfs/file.c
View File

@ -47,7 +47,6 @@
#include <linux/string.h>
#include <linux/pagemap.h>
#include <linux/mutex.h>
#include <linux/mm_inline.h>
#include "squashfs_fs.h"
#include "squashfs_fs_sb.h"
@ -452,129 +451,63 @@ static int squashfs_readpage_fragment(struct page *page, int expected)
return res;
}
static int squashfs_readpages_fragment(struct page *page,
struct list_head *readahead_pages, struct address_space *mapping,
int expected)
{
if (!page) {
page = lru_to_page(readahead_pages);
list_del(&page->lru);
if (add_to_page_cache_lru(page, mapping, page->index,
mapping_gfp_constraint(mapping, GFP_KERNEL))) {
put_page(page);
return 0;
}
}
return squashfs_readpage_fragment(page, expected);
}
static int squashfs_readpage_sparse(struct page *page, int expected)
{
squashfs_copy_cache(page, NULL, expected, 0);
return 0;
}
static int squashfs_readpages_sparse(struct page *page,
struct list_head *readahead_pages, struct address_space *mapping,
int expected)
static int squashfs_readpage(struct file *file, struct page *page)
{
if (!page) {
page = lru_to_page(readahead_pages);
list_del(&page->lru);
if (add_to_page_cache_lru(page, mapping, page->index,
mapping_gfp_constraint(mapping, GFP_KERNEL))) {
put_page(page);
return 0;
}
}
return squashfs_readpage_sparse(page, expected);
}
static int __squashfs_readpages(struct file *file, struct page *page,
struct list_head *readahead_pages, unsigned int nr_pages,
struct address_space *mapping)
{
struct inode *inode = mapping->host;
struct inode *inode = page->mapping->host;
struct squashfs_sb_info *msblk = inode->i_sb->s_fs_info;
int index = page->index >> (msblk->block_log - PAGE_SHIFT);
int file_end = i_size_read(inode) >> msblk->block_log;
int res;
do {
struct page *cur_page = page ? page
: lru_to_page(readahead_pages);
int page_index = cur_page->index;
int index = page_index >> (msblk->block_log - PAGE_SHIFT);
int expected = index == file_end ?
(i_size_read(inode) & (msblk->block_size - 1)) :
msblk->block_size;
int res;
void *pageaddr;
if (page_index >= ((i_size_read(inode) + PAGE_SIZE - 1) >>
TRACE("Entered squashfs_readpage, page index %lx, start block %llx\n",
page->index, squashfs_i(inode)->start);
if (page->index >= ((i_size_read(inode) + PAGE_SIZE - 1) >>
PAGE_SHIFT))
return 1;
goto out;
if (index < file_end || squashfs_i(inode)->fragment_block ==
SQUASHFS_INVALID_BLK) {
u64 block = 0;
int bsize = read_blocklist(inode, index, &block);
if (bsize < 0)
return -1;
goto error_out;
if (bsize == 0) {
res = squashfs_readpages_sparse(page,
readahead_pages, mapping, expected);
} else {
res = squashfs_readpages_block(page,
readahead_pages, &nr_pages, mapping,
page_index, block, bsize);
}
} else {
res = squashfs_readpages_fragment(page,
readahead_pages, mapping, expected);
}
if (res)
return 0;
page = NULL;
} while (readahead_pages && !list_empty(readahead_pages));
return 0;
}
static int squashfs_readpage(struct file *file, struct page *page)
{
int ret;
TRACE("Entered squashfs_readpage, page index %lx, start block %llx\n",
page->index, squashfs_i(page->mapping->host)->start);
get_page(page);
ret = __squashfs_readpages(file, page, NULL, 1, page->mapping);
if (ret) {
flush_dcache_page(page);
if (ret < 0)
SetPageError(page);
if (bsize == 0)
res = squashfs_readpage_sparse(page, expected);
else
SetPageUptodate(page);
zero_user_segment(page, 0, PAGE_SIZE);
unlock_page(page);
put_page(page);
}
res = squashfs_readpage_block(page, block, bsize, expected);
} else
res = squashfs_readpage_fragment(page, expected);
if (!res)
return 0;
}
static int squashfs_readpages(struct file *file, struct address_space *mapping,
struct list_head *pages, unsigned int nr_pages)
{
TRACE("Entered squashfs_readpages, %u pages, first page index %lx\n",
nr_pages, lru_to_page(pages)->index);
__squashfs_readpages(file, NULL, pages, nr_pages, mapping);
error_out:
SetPageError(page);
out:
pageaddr = kmap_atomic(page);
memset(pageaddr, 0, PAGE_SIZE);
kunmap_atomic(pageaddr);
flush_dcache_page(page);
if (!PageError(page))
SetPageUptodate(page);
unlock_page(page);
return 0;
}
const struct address_space_operations squashfs_aops = {
.readpage = squashfs_readpage,
.readpages = squashfs_readpages,
.readpage = squashfs_readpage
};

38
fs/squashfs/file_cache.c Normal file
View File

@ -0,0 +1,38 @@
/*
* Copyright (c) 2013
* Phillip Lougher <phillip@squashfs.org.uk>
*
* This work is licensed under the terms of the GNU GPL, version 2. See
* the COPYING file in the top-level directory.
*/
#include <linux/fs.h>
#include <linux/vfs.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/pagemap.h>
#include <linux/mutex.h>
#include "squashfs_fs.h"
#include "squashfs_fs_sb.h"
#include "squashfs_fs_i.h"
#include "squashfs.h"
/* Read separately compressed datablock and memcopy into page cache */
int squashfs_readpage_block(struct page *page, u64 block, int bsize, int expected)
{
struct inode *i = page->mapping->host;
struct squashfs_cache_entry *buffer = squashfs_get_datablock(i->i_sb,
block, bsize);
int res = buffer->error;
if (res)
ERROR("Unable to read page, block %llx, size %x\n", block,
bsize);
else
squashfs_copy_cache(page, buffer, expected, 0);
squashfs_cache_put(buffer);
return res;
}

238
fs/squashfs/file_direct.c
View File

@ -13,7 +13,6 @@
#include <linux/string.h>
#include <linux/pagemap.h>
#include <linux/mutex.h>
#include <linux/mm_inline.h>
#include "squashfs_fs.h"
#include "squashfs_fs_sb.h"
@ -21,66 +20,50 @@
#include "squashfs.h"
#include "page_actor.h"
static void release_actor_pages(struct page **page, int pages, int error)
static int squashfs_read_cache(struct page *target_page, u64 block, int bsize,
int pages, struct page **page, int bytes);
/* Read separately compressed datablock directly into page cache */
int squashfs_readpage_block(struct page *target_page, u64 block, int bsize,
int expected)
{
int i;
struct inode *inode = target_page->mapping->host;
struct squashfs_sb_info *msblk = inode->i_sb->s_fs_info;
for (i = 0; i < pages; i++) {
if (!page[i])
continue;
flush_dcache_page(page[i]);
if (!error)
SetPageUptodate(page[i]);
else {
SetPageError(page[i]);
zero_user_segment(page[i], 0, PAGE_SIZE);
}
unlock_page(page[i]);
put_page(page[i]);
}
kfree(page);
}
int file_end = (i_size_read(inode) - 1) >> PAGE_SHIFT;
int mask = (1 << (msblk->block_log - PAGE_SHIFT)) - 1;
int start_index = target_page->index & ~mask;
int end_index = start_index | mask;
int i, n, pages, missing_pages, bytes, res = -ENOMEM;
struct page **page;
struct squashfs_page_actor *actor;
void *pageaddr;
/*
if (end_index > file_end)
end_index = file_end;
pages = end_index - start_index + 1;
page = kmalloc_array(pages, sizeof(void *), GFP_KERNEL);
if (page == NULL)
return res;
/*
* Create a "page actor" which will kmap and kunmap the
* page cache pages appropriately within the decompressor
*/
static struct squashfs_page_actor *actor_from_page_cache(
unsigned int actor_pages, struct page *target_page,
struct list_head *rpages, unsigned int *nr_pages, int start_index,
struct address_space *mapping)
{
struct page **page;
struct squashfs_page_actor *actor;
int i, n;
gfp_t gfp = mapping_gfp_constraint(mapping, GFP_KERNEL);
actor = squashfs_page_actor_init_special(page, pages, 0);
if (actor == NULL)
goto out;
page = kmalloc_array(actor_pages, sizeof(void *), GFP_KERNEL);
if (!page)
return NULL;
/* Try to grab all the pages covered by the Squashfs block */
for (missing_pages = 0, i = 0, n = start_index; i < pages; i++, n++) {
page[i] = (n == target_page->index) ? target_page :
grab_cache_page_nowait(target_page->mapping, n);
for (i = 0, n = start_index; i < actor_pages; i++, n++) {
if (target_page == NULL && rpages && !list_empty(rpages)) {
struct page *cur_page = lru_to_page(rpages);
if (cur_page->index < start_index + actor_pages) {
list_del(&cur_page->lru);
--(*nr_pages);
if (add_to_page_cache_lru(cur_page, mapping,
cur_page->index, gfp))
put_page(cur_page);
else
target_page = cur_page;
} else
rpages = NULL;
}
if (target_page && target_page->index == n) {
page[i] = target_page;
target_page = NULL;
} else {
page[i] = grab_cache_page_nowait(mapping, n);
if (page[i] == NULL)
if (page[i] == NULL) {
missing_pages++;
continue;
}
@ -88,69 +71,106 @@ static struct squashfs_page_actor *actor_from_page_cache(
unlock_page(page[i]);
put_page(page[i]);
page[i] = NULL;
missing_pages++;
}
}
actor = squashfs_page_actor_init(page, actor_pages, 0,
release_actor_pages);
if (!actor) {
release_actor_pages(page, actor_pages, -ENOMEM);
kfree(page);
return NULL;
}
return actor;
}
int squashfs_readpages_block(struct page *target_page,
struct list_head *readahead_pages,
unsigned int *nr_pages,
struct address_space *mapping,
int page_index, u64 block, int bsize)
{
struct squashfs_page_actor *actor;
struct inode *inode = mapping->host;
struct squashfs_sb_info *msblk = inode->i_sb->s_fs_info;
int start_index, end_index, file_end, actor_pages, res;
int mask = (1 << (msblk->block_log - PAGE_SHIFT)) - 1;
if (missing_pages) {
/*
* If readpage() is called on an uncompressed datablock, we can just
* read the pages instead of fetching the whole block.
* This greatly improves the performance when a process keep doing
* random reads because we only fetch the necessary data.
* The readahead algorithm will take care of doing speculative reads
* if necessary.
* We can't read more than 1 block even if readahead provides use more
* pages because we don't know yet if the next block is compressed or
* not.
* Couldn't get one or more pages, this page has either
* been VM reclaimed, but others are still in the page cache
* and uptodate, or we're racing with another thread in
* squashfs_readpage also trying to grab them. Fall back to
* using an intermediate buffer.
*/
if (bsize && !SQUASHFS_COMPRESSED_BLOCK(bsize)) {
u64 block_end = block + msblk->block_size;
res = squashfs_read_cache(target_page, block, bsize, pages,
page, expected);
if (res < 0)
goto mark_errored;
block += (page_index & mask) * PAGE_SIZE;
actor_pages = (block_end - block) / PAGE_SIZE;
if (*nr_pages < actor_pages)
actor_pages = *nr_pages;
start_index = page_index;
bsize = min_t(int, bsize, (PAGE_SIZE * actor_pages)
| SQUASHFS_COMPRESSED_BIT_BLOCK);
} else {
file_end = (i_size_read(inode) - 1) >> PAGE_SHIFT;
start_index = page_index & ~mask;
end_index = start_index | mask;
if (end_index > file_end)
end_index = file_end;
actor_pages = end_index - start_index + 1;
goto out;
}
actor = actor_from_page_cache(actor_pages, target_page,
readahead_pages, nr_pages, start_index,
mapping);
if (!actor)
return -ENOMEM;
/* Decompress directly into the page cache buffers */
res = squashfs_read_data(inode->i_sb, block, bsize, NULL, actor);
if (res < 0)
goto mark_errored;
res = squashfs_read_data_async(inode->i_sb, block, bsize, NULL,
actor);
return res < 0 ? res : 0;
if (res != expected) {
res = -EIO;
goto mark_errored;
}
/* Last page may have trailing bytes not filled */
bytes = res % PAGE_SIZE;
if (bytes) {
pageaddr = kmap_atomic(page[pages - 1]);
memset(pageaddr + bytes, 0, PAGE_SIZE - bytes);
kunmap_atomic(pageaddr);
}
/* Mark pages as uptodate, unlock and release */
for (i = 0; i < pages; i++) {
flush_dcache_page(page[i]);
SetPageUptodate(page[i]);
unlock_page(page[i]);
if (page[i] != target_page)
put_page(page[i]);
}
kfree(actor);
kfree(page);
return 0;
mark_errored:
/* Decompression failed, mark pages as errored. Target_page is
* dealt with by the caller
*/
for (i = 0; i < pages; i++) {
if (page[i] == NULL || page[i] == target_page)
continue;
flush_dcache_page(page[i]);
SetPageError(page[i]);
unlock_page(page[i]);
put_page(page[i]);
}
out:
kfree(actor);
kfree(page);
return res;
}
static int squashfs_read_cache(struct page *target_page, u64 block, int bsize,
int pages, struct page **page, int bytes)
{
struct inode *i = target_page->mapping->host;
struct squashfs_cache_entry *buffer = squashfs_get_datablock(i->i_sb,
block, bsize);
int res = buffer->error, n, offset = 0;
if (res) {
ERROR("Unable to read page, block %llx, size %x\n", block,
bsize);
goto out;
}
for (n = 0; n < pages && bytes > 0; n++,
bytes -= PAGE_SIZE, offset += PAGE_SIZE) {
int avail = min_t(int, bytes, PAGE_SIZE);
if (page[n] == NULL)
continue;
squashfs_fill_page(page[n], buffer, offset, avail);
unlock_page(page[n]);
if (page[n] != target_page)
put_page(page[n]);
}
out:
squashfs_cache_put(buffer);
return res;
}

30
fs/squashfs/lz4_wrapper.c
View File

@ -94,17 +94,39 @@ static int lz4_uncompress(struct squashfs_sb_info *msblk, void *strm,
struct buffer_head **bh, int b, int offset, int length,
struct squashfs_page_actor *output)
{
int res;
struct squashfs_lz4 *stream = strm;
void *buff = stream->input, *data;
int avail, i, bytes = length, res;
for (i = 0; i < b; i++) {
avail = min(bytes, msblk->devblksize - offset);
memcpy(buff, bh[i]->b_data + offset, avail);
buff += avail;
bytes -= avail;
offset = 0;
put_bh(bh[i]);
}
squashfs_bh_to_buf(bh, b, stream->input, offset, length,
msblk->devblksize);
res = LZ4_decompress_safe(stream->input, stream->output,
length, output->length);
if (res < 0)
return -EIO;
squashfs_buf_to_actor(stream->output, output, res);
bytes = res;
data = squashfs_first_page(output);
buff = stream->output;
while (data) {
if (bytes <= PAGE_SIZE) {
memcpy(data, buff, bytes);
break;
}
memcpy(data, buff, PAGE_SIZE);
buff += PAGE_SIZE;
bytes -= PAGE_SIZE;
data = squashfs_next_page(output);
}
squashfs_finish_page(output);
return res;
}

40
fs/squashfs/lzo_wrapper.c
View File

@ -79,19 +79,45 @@ static int lzo_uncompress(struct squashfs_sb_info *msblk, void *strm,
struct buffer_head **bh, int b, int offset, int length,
struct squashfs_page_actor *output)
{
int res;
size_t out_len = output->length;
struct squashfs_lzo *stream = strm;
void *buff = stream->input, *data;
int avail, i, bytes = length, res;
size_t out_len = output->length;
for (i = 0; i < b; i++) {
avail = min(bytes, msblk->devblksize - offset);
memcpy(buff, bh[i]->b_data + offset, avail);
buff += avail;
bytes -= avail;
offset = 0;
put_bh(bh[i]);
}
squashfs_bh_to_buf(bh, b, stream->input, offset, length,
msblk->devblksize);
res = lzo1x_decompress_safe(stream->input, (size_t)length,
stream->output, &out_len);
if (res != LZO_E_OK)
return -EIO;
squashfs_buf_to_actor(stream->output, output, out_len);
goto failed;
return out_len;
res = bytes = (int)out_len;
data = squashfs_first_page(output);
buff = stream->output;
while (data) {
if (bytes <= PAGE_SIZE) {
memcpy(data, buff, bytes);
break;
} else {
memcpy(data, buff, PAGE_SIZE);
buff += PAGE_SIZE;
bytes -= PAGE_SIZE;
data = squashfs_next_page(output);
}
}
squashfs_finish_page(output);
return res;
failed:
return -EIO;
}
const struct squashfs_decompressor squashfs_lzo_comp_ops = {

201
fs/squashfs/page_actor.c
View File

@ -9,11 +9,79 @@
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/pagemap.h>
#include <linux/buffer_head.h>
#include "page_actor.h"
struct squashfs_page_actor *squashfs_page_actor_init(struct page **page,
int pages, int length, void (*release_pages)(struct page **, int, int))
/*
* This file contains implementations of page_actor for decompressing into
* an intermediate buffer, and for decompressing directly into the
* page cache.
*
* Calling code should avoid sleeping between calls to squashfs_first_page()
* and squashfs_finish_page().
*/
/* Implementation of page_actor for decompressing into intermediate buffer */
static void *cache_first_page(struct squashfs_page_actor *actor)
{
actor->next_page = 1;
return actor->buffer[0];
}
static void *cache_next_page(struct squashfs_page_actor *actor)
{
if (actor->next_page == actor->pages)
return NULL;
return actor->buffer[actor->next_page++];
}
static void cache_finish_page(struct squashfs_page_actor *actor)
{
/* empty */
}
struct squashfs_page_actor *squashfs_page_actor_init(void **buffer,
int pages, int length)
{
struct squashfs_page_actor *actor = kmalloc(sizeof(*actor), GFP_KERNEL);
if (actor == NULL)
return NULL;
actor->length = length ? : pages * PAGE_SIZE;
actor->buffer = buffer;
actor->pages = pages;
actor->next_page = 0;
actor->squashfs_first_page = cache_first_page;
actor->squashfs_next_page = cache_next_page;
actor->squashfs_finish_page = cache_finish_page;
return actor;
}
/* Implementation of page_actor for decompressing directly into page cache. */
static void *direct_first_page(struct squashfs_page_actor *actor)
{
actor->next_page = 1;
return actor->pageaddr = kmap_atomic(actor->page[0]);
}
static void *direct_next_page(struct squashfs_page_actor *actor)
{
if (actor->pageaddr)
kunmap_atomic(actor->pageaddr);
return actor->pageaddr = actor->next_page == actor->pages ? NULL :
kmap_atomic(actor->page[actor->next_page++]);
}
static void direct_finish_page(struct squashfs_page_actor *actor)
{
if (actor->pageaddr)
kunmap_atomic(actor->pageaddr);
}
struct squashfs_page_actor *squashfs_page_actor_init_special(struct page **page,
int pages, int length)
{
struct squashfs_page_actor *actor = kmalloc(sizeof(*actor), GFP_KERNEL);
@ -25,129 +93,8 @@ struct squashfs_page_actor *squashfs_page_actor_init(struct page **page,
actor->pages = pages;
actor->next_page = 0;
actor->pageaddr = NULL;
actor->release_pages = release_pages;
actor->squashfs_first_page = direct_first_page;
actor->squashfs_next_page = direct_next_page;
actor->squashfs_finish_page = direct_finish_page;
return actor;
}
void squashfs_page_actor_free(struct squashfs_page_actor *actor, int error)
{
if (!actor)
return;
if (actor->release_pages)
actor->release_pages(actor->page, actor->pages, error);
kfree(actor);
}
void squashfs_actor_to_buf(struct squashfs_page_actor *actor, void *buf,
int length)
{
void *pageaddr;
int pos = 0, avail, i;
for (i = 0; i < actor->pages && pos < length; ++i) {
avail = min_t(int, length - pos, PAGE_SIZE);
if (actor->page[i]) {
pageaddr = kmap_atomic(actor->page[i]);
memcpy(buf + pos, pageaddr, avail);
kunmap_atomic(pageaddr);
}
pos += avail;
}
}
void squashfs_buf_to_actor(void *buf, struct squashfs_page_actor *actor,
int length)
{
void *pageaddr;
int pos = 0, avail, i;
for (i = 0; i < actor->pages && pos < length; ++i) {
avail = min_t(int, length - pos, PAGE_SIZE);
if (actor->page[i]) {
pageaddr = kmap_atomic(actor->page[i]);
memcpy(pageaddr, buf + pos, avail);
kunmap_atomic(pageaddr);
}
pos += avail;
}
}
void squashfs_bh_to_actor(struct buffer_head **bh, int nr_buffers,
struct squashfs_page_actor *actor, int offset, int length, int blksz)
{
void *kaddr = NULL;
int bytes = 0, pgoff = 0, b = 0, p = 0, avail, i;
while (bytes < length) {
if (actor->page[p]) {
kaddr = kmap_atomic(actor->page[p]);
while (pgoff < PAGE_SIZE && bytes < length) {
avail = min_t(int, blksz - offset,
PAGE_SIZE - pgoff);
memcpy(kaddr + pgoff, bh[b]->b_data + offset,
avail);
pgoff += avail;
bytes += avail;
offset = (offset + avail) % blksz;
if (!offset) {
put_bh(bh[b]);
++b;
}
}
kunmap_atomic(kaddr);
pgoff = 0;
} else {
for (i = 0; i < PAGE_SIZE / blksz; ++i) {
if (bh[b])
put_bh(bh[b]);
++b;
}
bytes += PAGE_SIZE;
}
++p;
}
}
void squashfs_bh_to_buf(struct buffer_head **bh, int nr_buffers, void *buf,
int offset, int length, int blksz)
{
int i, avail, bytes = 0;
for (i = 0; i < nr_buffers && bytes < length; ++i) {
avail = min_t(int, length - bytes, blksz - offset);
if (bh[i]) {
memcpy(buf + bytes, bh[i]->b_data + offset, avail);
put_bh(bh[i]);
}
bytes += avail;
offset = 0;
}
}
void free_page_array(struct page **page, int nr_pages)
{
int i;
for (i = 0; i < nr_pages; ++i)
__free_page(page[i]);
kfree(page);
}
struct page **alloc_page_array(int nr_pages, int gfp_mask)
{
int i;
struct page **page;
page = kcalloc(nr_pages, sizeof(struct page *), gfp_mask);
if (!page)
return NULL;
for (i = 0; i < nr_pages; ++i) {
page[i] = alloc_page(gfp_mask);
if (!page[i]) {
free_page_array(page, i);
return NULL;
}
}
return page;
}

84
fs/squashfs/page_actor.h
View File

@ -5,61 +5,77 @@
* Phillip Lougher <phillip@squashfs.org.uk>
*
* This work is licensed under the terms of the GNU GPL, version 2. See
* the COPYING file in the top-level squashfsory.
* the COPYING file in the top-level directory.
*/
#ifndef CONFIG_SQUASHFS_FILE_DIRECT
struct squashfs_page_actor {
struct page **page;
void *pageaddr;
void **page;
int pages;
int length;
int next_page;
void (*release_pages)(struct page **, int, int);
};
extern struct squashfs_page_actor *squashfs_page_actor_init(struct page **,
int, int, void (*)(struct page **, int, int));
extern void squashfs_page_actor_free(struct squashfs_page_actor *, int);
static inline struct squashfs_page_actor *squashfs_page_actor_init(void **page,
int pages, int length)
{
struct squashfs_page_actor *actor = kmalloc(sizeof(*actor), GFP_KERNEL);
extern void squashfs_actor_to_buf(struct squashfs_page_actor *, void *, int);
extern void squashfs_buf_to_actor(void *, struct squashfs_page_actor *, int);
extern void squashfs_bh_to_actor(struct buffer_head **, int,
struct squashfs_page_actor *, int, int, int);
extern void squashfs_bh_to_buf(struct buffer_head **, int, void *, int, int,
int);
if (actor == NULL)
return NULL;
actor->length = length ? : pages * PAGE_SIZE;
actor->page = page;
actor->pages = pages;
actor->next_page = 0;
return actor;
}
/*
* Calling code should avoid sleeping between calls to squashfs_first_page()
* and squashfs_finish_page().
*/
static inline void *squashfs_first_page(struct squashfs_page_actor *actor)
{
actor->next_page = 1;
return actor->pageaddr = actor->page[0] ? kmap_atomic(actor->page[0])
: NULL;
return actor->page[0];
}
static inline void *squashfs_next_page(struct squashfs_page_actor *actor)
{
if (!IS_ERR_OR_NULL(actor->pageaddr))
kunmap_atomic(actor->pageaddr);
if (actor->next_page == actor->pages)
return actor->pageaddr = ERR_PTR(-ENODATA);
actor->pageaddr = actor->page[actor->next_page] ?
kmap_atomic(actor->page[actor->next_page]) : NULL;
++actor->next_page;
return actor->pageaddr;
return actor->next_page == actor->pages ? NULL :
actor->page[actor->next_page++];
}
static inline void squashfs_finish_page(struct squashfs_page_actor *actor)
{
if (!IS_ERR_OR_NULL(actor->pageaddr))
kunmap_atomic(actor->pageaddr);
/* empty */
}
#else
struct squashfs_page_actor {
union {
void **buffer;
struct page **page;
};
void *pageaddr;
void *(*squashfs_first_page)(struct squashfs_page_actor *);
void *(*squashfs_next_page)(struct squashfs_page_actor *);
void (*squashfs_finish_page)(struct squashfs_page_actor *);
int pages;
int length;
int next_page;
};
extern struct page **alloc_page_array(int, int);
extern void free_page_array(struct page **, int);
extern struct squashfs_page_actor *squashfs_page_actor_init(void **, int, int);
extern struct squashfs_page_actor *squashfs_page_actor_init_special(struct page
**, int, int);
static inline void *squashfs_first_page(struct squashfs_page_actor *actor)
{
return actor->squashfs_first_page(actor);
}
static inline void *squashfs_next_page(struct squashfs_page_actor *actor)
{
return actor->squashfs_next_page(actor);
}
static inline void squashfs_finish_page(struct squashfs_page_actor *actor)
{
actor->squashfs_finish_page(actor);
}
#endif
#endif

9
fs/squashfs/squashfs.h
View File

@ -28,12 +28,8 @@
#define WARNING(s, args...) pr_warn("SQUASHFS: "s, ## args)
/* block.c */
extern int squashfs_init_read_wq(void);
extern void squashfs_destroy_read_wq(void);
extern int squashfs_read_data(struct super_block *, u64, int, u64 *,
struct squashfs_page_actor *);
extern int squashfs_read_data_async(struct super_block *, u64, int, u64 *,
struct squashfs_page_actor *);
/* cache.c */
extern struct squashfs_cache *squashfs_cache_init(char *, int, int);
@ -75,9 +71,8 @@ void squashfs_fill_page(struct page *, struct squashfs_cache_entry *, int, int);
void squashfs_copy_cache(struct page *, struct squashfs_cache_entry *, int,
int);
/* file_direct.c */
extern int squashfs_readpages_block(struct page *, struct list_head *,
unsigned int *, struct address_space *, int, u64, int);
/* file_xxx.c */
extern int squashfs_readpage_block(struct page *, u64, int, int);
/* id.c */
extern int squashfs_get_id(struct super_block *, unsigned int, unsigned int *);

2
fs/squashfs/squashfs_fs_sb.h
View File

@ -49,7 +49,7 @@ struct squashfs_cache_entry {
int num_waiters;
wait_queue_head_t wait_queue;
struct squashfs_cache *cache;
struct page **page;
void **data;
struct squashfs_page_actor *actor;
};

7
fs/squashfs/super.c
View File

@ -445,15 +445,9 @@ static int __init init_squashfs_fs(void)
if (err)
return err;
if (!squashfs_init_read_wq()) {
destroy_inodecache();
return -ENOMEM;
}
err = register_filesystem(&squashfs_fs_type);
if (err) {
destroy_inodecache();
squashfs_destroy_read_wq();
return err;
}
@ -467,7 +461,6 @@ static void __exit exit_squashfs_fs(void)
{
unregister_filesystem(&squashfs_fs_type);
destroy_inodecache();
squashfs_destroy_read_wq();
}

15
fs/squashfs/xz_wrapper.c
View File

@ -55,7 +55,7 @@ static void *squashfs_xz_comp_opts(struct squashfs_sb_info *msblk,
struct comp_opts *opts;
int err = 0, n;
opts = kmalloc(sizeof(*opts), GFP_ATOMIC);
opts = kmalloc(sizeof(*opts), GFP_KERNEL);
if (opts == NULL) {
err = -ENOMEM;
goto out2;
@ -136,7 +136,6 @@ static int squashfs_xz_uncompress(struct squashfs_sb_info *msblk, void *strm,
enum xz_ret xz_err;
int avail, total = 0, k = 0;
struct squashfs_xz *stream = strm;
void *buf = NULL;
xz_dec_reset(stream->state);
stream->buf.in_pos = 0;
@ -157,20 +156,12 @@ static int squashfs_xz_uncompress(struct squashfs_sb_info *msblk, void *strm,
if (stream->buf.out_pos == stream->buf.out_size) {
stream->buf.out = squashfs_next_page(output);
if (!IS_ERR(stream->buf.out)) {
if (stream->buf.out != NULL) {
stream->buf.out_pos = 0;
total += PAGE_SIZE;
}
}
if (!stream->buf.out) {
if (!buf) {
buf = kmalloc(PAGE_SIZE, GFP_ATOMIC);
if (!buf)
goto out;
}
stream->buf.out = buf;
}
xz_err = xz_dec_run(stream->state, &stream->buf);
if (stream->buf.in_pos == stream->buf.in_size && k < b)
@ -182,13 +173,11 @@ static int squashfs_xz_uncompress(struct squashfs_sb_info *msblk, void *strm,
if (xz_err != XZ_STREAM_END || k < b)
goto out;
kfree(buf);
return total + stream->buf.out_pos;
out:
for (; k < b; k++)
put_bh(bh[k]);
kfree(buf);
return -EIO;
}

14
fs/squashfs/zlib_wrapper.c
View File

@ -66,7 +66,6 @@ static int zlib_uncompress(struct squashfs_sb_info *msblk, void *strm,
struct buffer_head **bh, int b, int offset, int length,
struct squashfs_page_actor *output)
{
void *buf = NULL;
int zlib_err, zlib_init = 0, k = 0;
z_stream *stream = strm;
@ -85,19 +84,10 @@ static int zlib_uncompress(struct squashfs_sb_info *msblk, void *strm,
if (stream->avail_out == 0) {
stream->next_out = squashfs_next_page(output);
if (!IS_ERR(stream->next_out))
if (stream->next_out != NULL)
stream->avail_out = PAGE_SIZE;
}
if (!stream->next_out) {
if (!buf) {
buf = kmalloc(PAGE_SIZE, GFP_ATOMIC);
if (!buf)
goto out;
}
stream->next_out = buf;
}
if (!zlib_init) {
zlib_err = zlib_inflateInit(stream);
if (zlib_err != Z_OK) {
@ -125,13 +115,11 @@ static int zlib_uncompress(struct squashfs_sb_info *msblk, void *strm,
if (k < b)
goto out;
kfree(buf);
return stream->total_out;
out:
for (; k < b; k++)
put_bh(bh[k]);
kfree(buf);
return -EIO;
}