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staging: erofs: cleanup `z_erofs_vle_normalaccess_readpages' 

This patch introduces `__should_decompress_synchronously' to
cleanup `z_erofs_vle_normalaccess_readpages'.

Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Gao Xiang 2018-09-20 00:06:56 +08:00 committed by Greg Kroah-Hartman
parent e5e3abbadf
commit 5fb76bb042
3 changed files with 22 additions and 14 deletions
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11
drivers/staging/erofs/internal.h
View File

@ -95,6 +95,9 @@ struct erofs_sb_info {
/* the dedicated workstation for compression */
struct radix_tree_root workstn_tree;
/* threshold for decompression synchronously */
unsigned int max_sync_decompress_pages;
#ifdef EROFS_FS_HAS_MANAGED_CACHE
struct inode *managed_cache;
#endif
@ -273,6 +276,14 @@ extern int erofs_try_to_free_cached_page(struct address_space *mapping,
struct page *page);
#endif
#define DEFAULT_MAX_SYNC_DECOMPRESS_PAGES 3
static inline bool __should_decompress_synchronously(struct erofs_sb_info *sbi,
unsigned int nr)
{
return nr <= sbi->max_sync_decompress_pages;
}
#endif
/* we strictly follow PAGE_SIZE and no buffer head yet */

5
drivers/staging/erofs/super.c
View File

@ -162,6 +162,11 @@ static void erofs_build_fault_attr(struct erofs_sb_info *sbi,
static void default_options(struct erofs_sb_info *sbi)
{
/* set up some FS parameters */
#ifdef CONFIG_EROFS_FS_ZIP
sbi->max_sync_decompress_pages = DEFAULT_MAX_SYNC_DECOMPRESS_PAGES;
#endif
#ifdef CONFIG_EROFS_FS_XATTR
set_opt(sbi, XATTR_USER);
#endif

20
drivers/staging/erofs/unzip_vle.c
View File

@ -1308,12 +1308,14 @@ out:
return 0;
}
static inline int __z_erofs_vle_normalaccess_readpages(
struct file *filp,
struct address_space *mapping,
struct list_head *pages, unsigned int nr_pages, bool sync)
static int z_erofs_vle_normalaccess_readpages(struct file *filp,
struct address_space *mapping,
struct list_head *pages,
unsigned int nr_pages)
{
struct inode *const inode = mapping->host;
struct erofs_sb_info *const sbi = EROFS_I_SB(inode);
const bool sync = __should_decompress_synchronously(sbi, nr_pages);
struct z_erofs_vle_frontend f = VLE_FRONTEND_INIT(inode);
gfp_t gfp = mapping_gfp_constraint(mapping, GFP_KERNEL);
@ -1372,16 +1374,6 @@ static inline int __z_erofs_vle_normalaccess_readpages(
return 0;
}
static int z_erofs_vle_normalaccess_readpages(
struct file *filp,
struct address_space *mapping,
struct list_head *pages, unsigned int nr_pages)
{
return __z_erofs_vle_normalaccess_readpages(filp,
mapping, pages, nr_pages,
nr_pages < 4 /* sync */);
}
const struct address_space_operations z_erofs_vle_normalaccess_aops = {
.readpage = z_erofs_vle_normalaccess_readpage,
.readpages = z_erofs_vle_normalaccess_readpages,