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erofs: enable sub-page compressed block support

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Let's just disable cached decompression and inplace I/Os for partial
pages as the first step in order to enable sub-page block initial
support.  In other words, currently it works primarily based on
temporary short-lived pages.  Don't expect too much in terms of
performance.

Reviewed-by: Yue Hu <huyue2@coolpad.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Link: https://lore.kernel.org/r/20231206091057.87027-6-hsiangkao@linux.alibaba.com
This commit is contained in:
Gao Xiang 2023-12-06 17:10:57 +08:00
parent 1ca0152014
commit 0ee3a0d59e
2 changed files with 8 additions and 4 deletions
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6
fs/erofs/inode.c
View File

@ -259,8 +259,10 @@ static int erofs_fill_inode(struct inode *inode)
if (erofs_inode_is_data_compressed(vi->datalayout)) {
#ifdef CONFIG_EROFS_FS_ZIP
if (!erofs_is_fscache_mode(inode->i_sb) &&
inode->i_sb->s_blocksize_bits == PAGE_SHIFT) {
if (!erofs_is_fscache_mode(inode->i_sb)) {
DO_ONCE_LITE_IF(inode->i_sb->s_blocksize != PAGE_SIZE,
erofs_info, inode->i_sb,
"EXPERIMENTAL EROFS subpage compressed block support in use. Use at your own risk!");
inode->i_mapping->a_ops = &z_erofs_aops;
err = 0;
goto out_unlock;

6
fs/erofs/zdata.c
View File

@ -563,6 +563,8 @@ static void z_erofs_bind_cache(struct z_erofs_decompress_frontend *fe)
__GFP_NOMEMALLOC | __GFP_NORETRY | __GFP_NOWARN;
unsigned int i;
if (i_blocksize(fe->inode) != PAGE_SIZE)
return;
if (fe->mode < Z_EROFS_PCLUSTER_FOLLOWED)
return;
@ -967,12 +969,12 @@ static int z_erofs_do_read_page(struct z_erofs_decompress_frontend *fe,
struct inode *const inode = fe->inode;
struct erofs_map_blocks *const map = &fe->map;
const loff_t offset = page_offset(page);
const unsigned int bs = i_blocksize(inode);
bool tight = true, exclusive;
unsigned int cur, end, len, split;
int err = 0;
z_erofs_onlinepage_init(page);
split = 0;
end = PAGE_SIZE;
repeat:
@ -1021,7 +1023,7 @@ static int z_erofs_do_read_page(struct z_erofs_decompress_frontend *fe,
* for inplace I/O or bvpage (should be processed in a strict order.)
*/
tight &= (fe->mode > Z_EROFS_PCLUSTER_FOLLOWED_NOINPLACE);
exclusive = (!cur && ((split <= 1) || tight));
exclusive = (!cur && ((split <= 1) || (tight && bs == PAGE_SIZE)));
if (cur)
tight &= (fe->mode >= Z_EROFS_PCLUSTER_FOLLOWED);