zisofs: Implement reading of compressed files when PAGE_CACHE_SIZE > compress block size
Also split and cleanup zisofs_readpage() when we are changing it anyway. Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Jan Kara
parent
3067e02f8f
commit
59bc055211
|
|
@ -35,6 +35,260 @@ static char zisofs_sink_page[PAGE_CACHE_SIZE];
|
|||
static void *zisofs_zlib_workspace;
|
||||
static DEFINE_MUTEX(zisofs_zlib_lock);
|
||||
|
||||
/*
|
||||
* Read data of @inode from @block_start to @block_end and uncompress
|
||||
* to one zisofs block. Store the data in the @pages array with @pcount
|
||||
* entries. Start storing at offset @poffset of the first page.
|
||||
*/
|
||||
static loff_t zisofs_uncompress_block(struct inode *inode, loff_t block_start,
|
||||
loff_t block_end, int pcount,
|
||||
struct page **pages, unsigned poffset,
|
||||
int *errp)
|
||||
{
|
||||
unsigned int zisofs_block_shift = ISOFS_I(inode)->i_format_parm[1];
|
||||
unsigned int bufsize = ISOFS_BUFFER_SIZE(inode);
|
||||
unsigned int bufshift = ISOFS_BUFFER_BITS(inode);
|
||||
unsigned int bufmask = bufsize - 1;
|
||||
int i, block_size = block_end - block_start;
|
||||
z_stream stream = { .total_out = 0,
|
||||
.avail_in = 0,
|
||||
.avail_out = 0, };
|
||||
int zerr;
|
||||
int needblocks = (block_size + (block_start & bufmask) + bufmask)
|
||||
>> bufshift;
|
||||
int haveblocks;
|
||||
blkcnt_t blocknum;
|
||||
struct buffer_head *bhs[needblocks + 1];
|
||||
int curbh, curpage;
|
||||
|
||||
if (block_size > deflateBound(1UL << zisofs_block_shift)) {
|
||||
*errp = -EIO;
|
||||
return 0;
|
||||
}
|
||||
/* Empty block? */
|
||||
if (block_size == 0) {
|
||||
for ( i = 0 ; i < pcount ; i++ ) {
|
||||
if (!pages[i])
|
||||
continue;
|
||||
memset(page_address(pages[i]), 0, PAGE_CACHE_SIZE);
|
||||
flush_dcache_page(pages[i]);
|
||||
SetPageUptodate(pages[i]);
|
||||
}
|
||||
return ((loff_t)pcount) << PAGE_CACHE_SHIFT;
|
||||
}
|
||||
|
||||
/* Because zlib is not thread-safe, do all the I/O at the top. */
|
||||
blocknum = block_start >> bufshift;
|
||||
memset(bhs, 0, (needblocks + 1) * sizeof(struct buffer_head *));
|
||||
haveblocks = isofs_get_blocks(inode, blocknum, bhs, needblocks);
|
||||
ll_rw_block(READ, haveblocks, bhs);
|
||||
|
||||
curbh = 0;
|
||||
curpage = 0;
|
||||
/*
|
||||
* First block is special since it may be fractional. We also wait for
|
||||
* it before grabbing the zlib mutex; odds are that the subsequent
|
||||
* blocks are going to come in in short order so we don't hold the zlib
|
||||
* mutex longer than necessary.
|
||||
*/
|
||||
|
||||
if (!bhs[0])
|
||||
goto b_eio;
|
||||
|
||||
wait_on_buffer(bhs[0]);
|
||||
if (!buffer_uptodate(bhs[0])) {
|
||||
*errp = -EIO;
|
||||
goto b_eio;
|
||||
}
|
||||
|
||||
stream.workspace = zisofs_zlib_workspace;
|
||||
mutex_lock(&zisofs_zlib_lock);
|
||||
|
||||
zerr = zlib_inflateInit(&stream);
|
||||
if (zerr != Z_OK) {
|
||||
if (zerr == Z_MEM_ERROR)
|
||||
*errp = -ENOMEM;
|
||||
else
|
||||
*errp = -EIO;
|
||||
printk(KERN_DEBUG "zisofs: zisofs_inflateInit returned %d\n",
|
||||
zerr);
|
||||
goto z_eio;
|
||||
}
|
||||
|
||||
while (curpage < pcount && curbh < haveblocks &&
|
||||
zerr != Z_STREAM_END) {
|
||||
if (!stream.avail_out) {
|
||||
if (pages[curpage]) {
|
||||
stream.next_out = page_address(pages[curpage])
|
||||
+ poffset;
|
||||
stream.avail_out = PAGE_CACHE_SIZE - poffset;
|
||||
poffset = 0;
|
||||
} else {
|
||||
stream.next_out = (void *)&zisofs_sink_page;
|
||||
stream.avail_out = PAGE_CACHE_SIZE;
|
||||
}
|
||||
}
|
||||
if (!stream.avail_in) {
|
||||
wait_on_buffer(bhs[curbh]);
|
||||
if (!buffer_uptodate(bhs[curbh])) {
|
||||
*errp = -EIO;
|
||||
break;
|
||||
}
|
||||
stream.next_in = bhs[curbh]->b_data +
|
||||
(block_start & bufmask);
|
||||
stream.avail_in = min_t(unsigned, bufsize -
|
||||
(block_start & bufmask),
|
||||
block_size);
|
||||
block_size -= stream.avail_in;
|
||||
block_start = 0;
|
||||
}
|
||||
|
||||
while (stream.avail_out && stream.avail_in) {
|
||||
zerr = zlib_inflate(&stream, Z_SYNC_FLUSH);
|
||||
if (zerr == Z_BUF_ERROR && stream.avail_in == 0)
|
||||
break;
|
||||
if (zerr == Z_STREAM_END)
|
||||
break;
|
||||
if (zerr != Z_OK) {
|
||||
/* EOF, error, or trying to read beyond end of input */
|
||||
if (zerr == Z_MEM_ERROR)
|
||||
*errp = -ENOMEM;
|
||||
else {
|
||||
printk(KERN_DEBUG
|
||||
"zisofs: zisofs_inflate returned"
|
||||
" %d, inode = %lu,"
|
||||
" page idx = %d, bh idx = %d,"
|
||||
" avail_in = %d,"
|
||||
" avail_out = %d\n",
|
||||
zerr, inode->i_ino, curpage,
|
||||
curbh, stream.avail_in,
|
||||
stream.avail_out);
|
||||
*errp = -EIO;
|
||||
}
|
||||
goto inflate_out;
|
||||
}
|
||||
}
|
||||
|
||||
if (!stream.avail_out) {
|
||||
/* This page completed */
|
||||
if (pages[curpage]) {
|
||||
flush_dcache_page(pages[curpage]);
|
||||
SetPageUptodate(pages[curpage]);
|
||||
}
|
||||
curpage++;
|
||||
}
|
||||
if (!stream.avail_in)
|
||||
curbh++;
|
||||
}
|
||||
inflate_out:
|
||||
zlib_inflateEnd(&stream);
|
||||
|
||||
z_eio:
|
||||
mutex_unlock(&zisofs_zlib_lock);
|
||||
|
||||
b_eio:
|
||||
for (i = 0; i < haveblocks; i++)
|
||||
brelse(bhs[i]);
|
||||
return stream.total_out;
|
||||
}
|
||||
|
||||
/*
|
||||
* Uncompress data so that pages[full_page] is fully uptodate and possibly
|
||||
* fills in other pages if we have data for them.
|
||||
*/
|
||||
static int zisofs_fill_pages(struct inode *inode, int full_page, int pcount,
|
||||
struct page **pages)
|
||||
{
|
||||
loff_t start_off, end_off;
|
||||
loff_t block_start, block_end;
|
||||
unsigned int header_size = ISOFS_I(inode)->i_format_parm[0];
|
||||
unsigned int zisofs_block_shift = ISOFS_I(inode)->i_format_parm[1];
|
||||
unsigned int blockptr;
|
||||
loff_t poffset = 0;
|
||||
blkcnt_t cstart_block, cend_block;
|
||||
struct buffer_head *bh;
|
||||
unsigned int blkbits = ISOFS_BUFFER_BITS(inode);
|
||||
unsigned int blksize = 1 << blkbits;
|
||||
int err;
|
||||
loff_t ret;
|
||||
|
||||
BUG_ON(!pages[full_page]);
|
||||
|
||||
/*
|
||||
* We want to read at least 'full_page' page. Because we have to
|
||||
* uncompress the whole compression block anyway, fill the surrounding
|
||||
* pages with the data we have anyway...
|
||||
*/
|
||||
start_off = page_offset(pages[full_page]);
|
||||
end_off = min_t(loff_t, start_off + PAGE_CACHE_SIZE, inode->i_size);
|
||||
|
||||
cstart_block = start_off >> zisofs_block_shift;
|
||||
cend_block = (end_off + (1 << zisofs_block_shift) - 1)
|
||||
>> zisofs_block_shift;
|
||||
|
||||
WARN_ON(start_off - (full_page << PAGE_CACHE_SHIFT) !=
|
||||
((cstart_block << zisofs_block_shift) & PAGE_CACHE_MASK));
|
||||
|
||||
/* Find the pointer to this specific chunk */
|
||||
/* Note: we're not using isonum_731() here because the data is known aligned */
|
||||
/* Note: header_size is in 32-bit words (4 bytes) */
|
||||
blockptr = (header_size + cstart_block) << 2;
|
||||
bh = isofs_bread(inode, blockptr >> blkbits);
|
||||
if (!bh)
|
||||
return -EIO;
|
||||
block_start = le32_to_cpu(*(__le32 *)
|
||||
(bh->b_data + (blockptr & (blksize - 1))));
|
||||
|
||||
while (cstart_block < cend_block && pcount > 0) {
|
||||
/* Load end of the compressed block in the file */
|
||||
blockptr += 4;
|
||||
/* Traversed to next block? */
|
||||
if (!(blockptr & (blksize - 1))) {
|
||||
brelse(bh);
|
||||
|
||||
bh = isofs_bread(inode, blockptr >> blkbits);
|
||||
if (!bh)
|
||||
return -EIO;
|
||||
}
|
||||
block_end = le32_to_cpu(*(__le32 *)
|
||||
(bh->b_data + (blockptr & (blksize - 1))));
|
||||
if (block_start > block_end) {
|
||||
brelse(bh);
|
||||
return -EIO;
|
||||
}
|
||||
err = 0;
|
||||
ret = zisofs_uncompress_block(inode, block_start, block_end,
|
||||
pcount, pages, poffset, &err);
|
||||
poffset += ret;
|
||||
pages += poffset >> PAGE_CACHE_SHIFT;
|
||||
pcount -= poffset >> PAGE_CACHE_SHIFT;
|
||||
full_page -= poffset >> PAGE_CACHE_SHIFT;
|
||||
poffset &= ~PAGE_CACHE_MASK;
|
||||
|
||||
if (err) {
|
||||
brelse(bh);
|
||||
/*
|
||||
* Did we finish reading the page we really wanted
|
||||
* to read?
|
||||
*/
|
||||
if (full_page < 0)
|
||||
return 0;
|
||||
return err;
|
||||
}
|
||||
|
||||
block_start = block_end;
|
||||
cstart_block++;
|
||||
}
|
||||
|
||||
if (poffset && *pages) {
|
||||
memset(page_address(*pages) + poffset, 0,
|
||||
PAGE_CACHE_SIZE - poffset);
|
||||
flush_dcache_page(*pages);
|
||||
SetPageUptodate(*pages);
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* When decompressing, we typically obtain more than one page
|
||||
* per reference. We inject the additional pages into the page
|
||||
|
|
@ -44,278 +298,61 @@ static int zisofs_readpage(struct file *file, struct page *page)
|
|||
{
|
||||
struct inode *inode = file->f_path.dentry->d_inode;
|
||||
struct address_space *mapping = inode->i_mapping;
|
||||
unsigned int maxpage, xpage, fpage, blockindex;
|
||||
unsigned long offset;
|
||||
unsigned long blockptr, blockendptr, cstart, cend, csize;
|
||||
struct buffer_head *bh, *ptrbh[2];
|
||||
unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
|
||||
unsigned int bufshift = ISOFS_BUFFER_BITS(inode);
|
||||
unsigned long bufmask = bufsize - 1;
|
||||
int err = -EIO;
|
||||
int i;
|
||||
unsigned int header_size = ISOFS_I(inode)->i_format_parm[0];
|
||||
int err;
|
||||
int i, pcount, full_page;
|
||||
unsigned int zisofs_block_shift = ISOFS_I(inode)->i_format_parm[1];
|
||||
/* unsigned long zisofs_block_size = 1UL << zisofs_block_shift; */
|
||||
unsigned int zisofs_block_page_shift = zisofs_block_shift-PAGE_CACHE_SHIFT;
|
||||
unsigned long zisofs_block_pages = 1UL << zisofs_block_page_shift;
|
||||
unsigned long zisofs_block_page_mask = zisofs_block_pages-1;
|
||||
struct page *pages[zisofs_block_pages];
|
||||
unsigned long index = page->index;
|
||||
int indexblocks;
|
||||
|
||||
/* We have already been given one page, this is the one
|
||||
we must do. */
|
||||
xpage = index & zisofs_block_page_mask;
|
||||
pages[xpage] = page;
|
||||
|
||||
/* The remaining pages need to be allocated and inserted */
|
||||
offset = index & ~zisofs_block_page_mask;
|
||||
blockindex = offset >> zisofs_block_page_shift;
|
||||
maxpage = (inode->i_size + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
|
||||
unsigned int zisofs_pages_per_cblock =
|
||||
PAGE_CACHE_SHIFT <= zisofs_block_shift ?
|
||||
(1 << (zisofs_block_shift - PAGE_CACHE_SHIFT)) : 0;
|
||||
struct page *pages[max_t(unsigned, zisofs_pages_per_cblock, 1)];
|
||||
pgoff_t index = page->index, end_index;
|
||||
|
||||
end_index = (inode->i_size + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
|
||||
/*
|
||||
* If this page is wholly outside i_size we just return zero;
|
||||
* do_generic_file_read() will handle this for us
|
||||
*/
|
||||
if (page->index >= maxpage) {
|
||||
if (index >= end_index) {
|
||||
SetPageUptodate(page);
|
||||
unlock_page(page);
|
||||
return 0;
|
||||
}
|
||||
|
||||
maxpage = min(zisofs_block_pages, maxpage-offset);
|
||||
|
||||
for ( i = 0 ; i < maxpage ; i++, offset++ ) {
|
||||
if ( i != xpage ) {
|
||||
pages[i] = grab_cache_page_nowait(mapping, offset);
|
||||
}
|
||||
page = pages[i];
|
||||
if ( page ) {
|
||||
ClearPageError(page);
|
||||
kmap(page);
|
||||
}
|
||||
}
|
||||
|
||||
/* This is the last page filled, plus one; used in case of abort. */
|
||||
fpage = 0;
|
||||
|
||||
/* Find the pointer to this specific chunk */
|
||||
/* Note: we're not using isonum_731() here because the data is known aligned */
|
||||
/* Note: header_size is in 32-bit words (4 bytes) */
|
||||
blockptr = (header_size + blockindex) << 2;
|
||||
blockendptr = blockptr + 4;
|
||||
|
||||
indexblocks = ((blockptr^blockendptr) >> bufshift) ? 2 : 1;
|
||||
ptrbh[0] = ptrbh[1] = NULL;
|
||||
|
||||
if ( isofs_get_blocks(inode, blockptr >> bufshift, ptrbh, indexblocks) != indexblocks ) {
|
||||
if ( ptrbh[0] ) brelse(ptrbh[0]);
|
||||
printk(KERN_DEBUG "zisofs: Null buffer on reading block table, inode = %lu, block = %lu\n",
|
||||
inode->i_ino, blockptr >> bufshift);
|
||||
goto eio;
|
||||
}
|
||||
ll_rw_block(READ, indexblocks, ptrbh);
|
||||
|
||||
bh = ptrbh[0];
|
||||
if ( !bh || (wait_on_buffer(bh), !buffer_uptodate(bh)) ) {
|
||||
printk(KERN_DEBUG "zisofs: Failed to read block table, inode = %lu, block = %lu\n",
|
||||
inode->i_ino, blockptr >> bufshift);
|
||||
if ( ptrbh[1] )
|
||||
brelse(ptrbh[1]);
|
||||
goto eio;
|
||||
}
|
||||
cstart = le32_to_cpu(*(__le32 *)(bh->b_data + (blockptr & bufmask)));
|
||||
|
||||
if ( indexblocks == 2 ) {
|
||||
/* We just crossed a block boundary. Switch to the next block */
|
||||
brelse(bh);
|
||||
bh = ptrbh[1];
|
||||
if ( !bh || (wait_on_buffer(bh), !buffer_uptodate(bh)) ) {
|
||||
printk(KERN_DEBUG "zisofs: Failed to read block table, inode = %lu, block = %lu\n",
|
||||
inode->i_ino, blockendptr >> bufshift);
|
||||
goto eio;
|
||||
}
|
||||
}
|
||||
cend = le32_to_cpu(*(__le32 *)(bh->b_data + (blockendptr & bufmask)));
|
||||
brelse(bh);
|
||||
|
||||
if (cstart > cend)
|
||||
goto eio;
|
||||
|
||||
csize = cend-cstart;
|
||||
|
||||
if (csize > deflateBound(1UL << zisofs_block_shift))
|
||||
goto eio;
|
||||
|
||||
/* Now page[] contains an array of pages, any of which can be NULL,
|
||||
and the locks on which we hold. We should now read the data and
|
||||
release the pages. If the pages are NULL the decompressed data
|
||||
for that particular page should be discarded. */
|
||||
|
||||
if ( csize == 0 ) {
|
||||
/* This data block is empty. */
|
||||
|
||||
for ( fpage = 0 ; fpage < maxpage ; fpage++ ) {
|
||||
if ( (page = pages[fpage]) != NULL ) {
|
||||
memset(page_address(page), 0, PAGE_CACHE_SIZE);
|
||||
|
||||
flush_dcache_page(page);
|
||||
SetPageUptodate(page);
|
||||
kunmap(page);
|
||||
unlock_page(page);
|
||||
if ( fpage == xpage )
|
||||
err = 0; /* The critical page */
|
||||
else
|
||||
page_cache_release(page);
|
||||
}
|
||||
}
|
||||
if (PAGE_CACHE_SHIFT <= zisofs_block_shift) {
|
||||
/* We have already been given one page, this is the one
|
||||
we must do. */
|
||||
full_page = index & (zisofs_pages_per_cblock - 1);
|
||||
pcount = min_t(int, zisofs_pages_per_cblock,
|
||||
end_index - (index & ~(zisofs_pages_per_cblock - 1)));
|
||||
index -= full_page;
|
||||
} else {
|
||||
/* This data block is compressed. */
|
||||
z_stream stream;
|
||||
int bail = 0, left_out = -1;
|
||||
int zerr;
|
||||
int needblocks = (csize + (cstart & bufmask) + bufmask) >> bufshift;
|
||||
int haveblocks;
|
||||
struct buffer_head *bhs[needblocks+1];
|
||||
struct buffer_head **bhptr;
|
||||
full_page = 0;
|
||||
pcount = 1;
|
||||
}
|
||||
pages[full_page] = page;
|
||||
|
||||
/* Because zlib is not thread-safe, do all the I/O at the top. */
|
||||
|
||||
blockptr = cstart >> bufshift;
|
||||
memset(bhs, 0, (needblocks+1)*sizeof(struct buffer_head *));
|
||||
haveblocks = isofs_get_blocks(inode, blockptr, bhs, needblocks);
|
||||
ll_rw_block(READ, haveblocks, bhs);
|
||||
|
||||
bhptr = &bhs[0];
|
||||
bh = *bhptr++;
|
||||
|
||||
/* First block is special since it may be fractional.
|
||||
We also wait for it before grabbing the zlib
|
||||
mutex; odds are that the subsequent blocks are
|
||||
going to come in in short order so we don't hold
|
||||
the zlib mutex longer than necessary. */
|
||||
|
||||
if ( !bh || (wait_on_buffer(bh), !buffer_uptodate(bh)) ) {
|
||||
printk(KERN_DEBUG "zisofs: Hit null buffer, fpage = %d, xpage = %d, csize = %ld\n",
|
||||
fpage, xpage, csize);
|
||||
goto b_eio;
|
||||
}
|
||||
stream.next_in = bh->b_data + (cstart & bufmask);
|
||||
stream.avail_in = min(bufsize-(cstart & bufmask), csize);
|
||||
csize -= stream.avail_in;
|
||||
|
||||
stream.workspace = zisofs_zlib_workspace;
|
||||
mutex_lock(&zisofs_zlib_lock);
|
||||
|
||||
zerr = zlib_inflateInit(&stream);
|
||||
if ( zerr != Z_OK ) {
|
||||
if ( err && zerr == Z_MEM_ERROR )
|
||||
err = -ENOMEM;
|
||||
printk(KERN_DEBUG "zisofs: zisofs_inflateInit returned %d\n",
|
||||
zerr);
|
||||
goto z_eio;
|
||||
}
|
||||
|
||||
while ( !bail && fpage < maxpage ) {
|
||||
page = pages[fpage];
|
||||
if ( page )
|
||||
stream.next_out = page_address(page);
|
||||
else
|
||||
stream.next_out = (void *)&zisofs_sink_page;
|
||||
stream.avail_out = PAGE_CACHE_SIZE;
|
||||
|
||||
while ( stream.avail_out ) {
|
||||
int ao, ai;
|
||||
if ( stream.avail_in == 0 && left_out ) {
|
||||
if ( !csize ) {
|
||||
printk(KERN_WARNING "zisofs: ZF read beyond end of input\n");
|
||||
bail = 1;
|
||||
break;
|
||||
} else {
|
||||
bh = *bhptr++;
|
||||
if ( !bh ||
|
||||
(wait_on_buffer(bh), !buffer_uptodate(bh)) ) {
|
||||
/* Reached an EIO */
|
||||
printk(KERN_DEBUG "zisofs: Hit null buffer, fpage = %d, xpage = %d, csize = %ld\n",
|
||||
fpage, xpage, csize);
|
||||
|
||||
bail = 1;
|
||||
break;
|
||||
}
|
||||
stream.next_in = bh->b_data;
|
||||
stream.avail_in = min(csize,bufsize);
|
||||
csize -= stream.avail_in;
|
||||
}
|
||||
}
|
||||
ao = stream.avail_out; ai = stream.avail_in;
|
||||
zerr = zlib_inflate(&stream, Z_SYNC_FLUSH);
|
||||
left_out = stream.avail_out;
|
||||
if ( zerr == Z_BUF_ERROR && stream.avail_in == 0 )
|
||||
continue;
|
||||
if ( zerr != Z_OK ) {
|
||||
/* EOF, error, or trying to read beyond end of input */
|
||||
if ( err && zerr == Z_MEM_ERROR )
|
||||
err = -ENOMEM;
|
||||
if ( zerr != Z_STREAM_END )
|
||||
printk(KERN_DEBUG "zisofs: zisofs_inflate returned %d, inode = %lu, index = %lu, fpage = %d, xpage = %d, avail_in = %d, avail_out = %d, ai = %d, ao = %d\n",
|
||||
zerr, inode->i_ino, index,
|
||||
fpage, xpage,
|
||||
stream.avail_in, stream.avail_out,
|
||||
ai, ao);
|
||||
bail = 1;
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
if ( stream.avail_out && zerr == Z_STREAM_END ) {
|
||||
/* Fractional page written before EOF. This may
|
||||
be the last page in the file. */
|
||||
memset(stream.next_out, 0, stream.avail_out);
|
||||
stream.avail_out = 0;
|
||||
}
|
||||
|
||||
if ( !stream.avail_out ) {
|
||||
/* This page completed */
|
||||
if ( page ) {
|
||||
flush_dcache_page(page);
|
||||
SetPageUptodate(page);
|
||||
kunmap(page);
|
||||
unlock_page(page);
|
||||
if ( fpage == xpage )
|
||||
err = 0; /* The critical page */
|
||||
else
|
||||
page_cache_release(page);
|
||||
}
|
||||
fpage++;
|
||||
}
|
||||
}
|
||||
zlib_inflateEnd(&stream);
|
||||
|
||||
z_eio:
|
||||
mutex_unlock(&zisofs_zlib_lock);
|
||||
|
||||
b_eio:
|
||||
for ( i = 0 ; i < haveblocks ; i++ ) {
|
||||
if ( bhs[i] )
|
||||
brelse(bhs[i]);
|
||||
for (i = 0; i < pcount; i++, index++) {
|
||||
if (i != full_page)
|
||||
pages[i] = grab_cache_page_nowait(mapping, index);
|
||||
if (pages[i]) {
|
||||
ClearPageError(pages[i]);
|
||||
kmap(pages[i]);
|
||||
}
|
||||
}
|
||||
|
||||
eio:
|
||||
err = zisofs_fill_pages(inode, full_page, pcount, pages);
|
||||
|
||||
/* Release any residual pages, do not SetPageUptodate */
|
||||
while ( fpage < maxpage ) {
|
||||
page = pages[fpage];
|
||||
if ( page ) {
|
||||
flush_dcache_page(page);
|
||||
if ( fpage == xpage )
|
||||
SetPageError(page);
|
||||
kunmap(page);
|
||||
unlock_page(page);
|
||||
if ( fpage != xpage )
|
||||
page_cache_release(page);
|
||||
for (i = 0; i < pcount; i++) {
|
||||
if (pages[i]) {
|
||||
flush_dcache_page(pages[i]);
|
||||
if (i == full_page && err)
|
||||
SetPageError(pages[i]);
|
||||
kunmap(pages[i]);
|
||||
unlock_page(pages[i]);
|
||||
if (i != full_page)
|
||||
page_cache_release(pages[i]);
|
||||
}
|
||||
fpage++;
|
||||
}
|
||||
|
||||
/* At this point, err contains 0 or -EIO depending on the "critical" page */
|
||||
|
|
|
|||
|
|
@ -518,8 +518,7 @@ repeat:
|
|||
if (algo == SIG('p', 'z')) {
|
||||
int block_shift =
|
||||
isonum_711(&rr->u.ZF.parms[1]);
|
||||
if (block_shift < PAGE_CACHE_SHIFT
|
||||
|| block_shift > 17) {
|
||||
if (block_shift > 17) {
|
||||
printk(KERN_WARNING "isofs: "
|
||||
"Can't handle ZF block "
|
||||
"size of 2^%d\n",
|
||||
|
|
|
|||
Reference in New Issue