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erofs: clean up z_erofs_pcluster_readmore()

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`end` parameter is no needed since it's pointless for !backmost, we can
handle it with backmost internally.  And we only expand the trailing
edge, so the newstart can be replaced with ->headoffset.

Also, remove linux/prefetch.h inclusion since that is not used anymore
after commit 386292919c ("erofs: introduce readmore decompression
strategy").

Signed-off-by: Yue Hu <huyue2@coolpad.com>
Reviewed-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Link: https://lore.kernel.org/r/20230525072605.17857-1-zbestahu@gmail.com
[ Gao Xiang: update commit description. ]
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
This commit is contained in:
Yue Hu 2023-05-25 15:26:05 +08:00 committed by Gao Xiang
parent ef4b4b46c6
commit 796e9149a2
1 changed files with 12 additions and 15 deletions
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27
fs/erofs/zdata.c
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@ -5,7 +5,6 @@
* Copyright (C) 2022 Alibaba Cloud
*/
#include "compress.h"
#include <linux/prefetch.h>
#include <linux/psi.h>
#include <linux/cpuhotplug.h>
#include <trace/events/erofs.h>
@ -1825,28 +1824,28 @@ static void z_erofs_runqueue(struct z_erofs_decompress_frontend *f,
*/
static void z_erofs_pcluster_readmore(struct z_erofs_decompress_frontend *f,
struct readahead_control *rac,
erofs_off_t end,
struct page **pagepool,
bool backmost)
struct page **pagepool, bool backmost)
{
struct inode *inode = f->inode;
struct erofs_map_blocks *map = &f->map;
erofs_off_t cur;
erofs_off_t cur, end, headoffset = f->headoffset;
int err;
if (backmost) {
if (rac)
end = headoffset + readahead_length(rac) - 1;
else
end = headoffset + PAGE_SIZE - 1;
map->m_la = end;
err = z_erofs_map_blocks_iter(inode, map,
EROFS_GET_BLOCKS_READMORE);
if (err)
return;
/* expend ra for the trailing edge if readahead */
/* expand ra for the trailing edge if readahead */
if (rac) {
loff_t newstart = readahead_pos(rac);
cur = round_up(map->m_la + map->m_llen, PAGE_SIZE);
readahead_expand(rac, newstart, cur - newstart);
readahead_expand(rac, headoffset, cur - headoffset);
return;
}
end = round_up(end, PAGE_SIZE);
@ -1894,10 +1893,9 @@ static int z_erofs_read_folio(struct file *file, struct folio *folio)
trace_erofs_readpage(page, false);
f.headoffset = (erofs_off_t)page->index << PAGE_SHIFT;
z_erofs_pcluster_readmore(&f, NULL, f.headoffset + PAGE_SIZE - 1,
&pagepool, true);
z_erofs_pcluster_readmore(&f, NULL, &pagepool, true);
err = z_erofs_do_read_page(&f, page, &pagepool);
z_erofs_pcluster_readmore(&f, NULL, 0, &pagepool, false);
z_erofs_pcluster_readmore(&f, NULL, &pagepool, false);
(void)z_erofs_collector_end(&f);
@ -1923,8 +1921,7 @@ static void z_erofs_readahead(struct readahead_control *rac)
f.headoffset = readahead_pos(rac);
z_erofs_pcluster_readmore(&f, rac, f.headoffset +
readahead_length(rac) - 1, &pagepool, true);
z_erofs_pcluster_readmore(&f, rac, &pagepool, true);
nr_pages = readahead_count(rac);
trace_erofs_readpages(inode, readahead_index(rac), nr_pages, false);
@ -1947,7 +1944,7 @@ static void z_erofs_readahead(struct readahead_control *rac)
page->index, EROFS_I(inode)->nid);
put_page(page);
}
z_erofs_pcluster_readmore(&f, rac, 0, &pagepool, false);
z_erofs_pcluster_readmore(&f, rac, &pagepool, false);
(void)z_erofs_collector_end(&f);
z_erofs_runqueue(&f, &pagepool,