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erofs: get rid of fe->backmost for cache decompression

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EROFS_MAP_FULL_MAPPED is more accurate to decide if caching the last
incomplete pcluster for later read or not.

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/20230817082813.81180-6-hsiangkao@linux.alibaba.com
This commit is contained in:
Gao Xiang 2023-08-17 16:28:11 +08:00
parent 9a05c6a8bc
commit 06ec03660d
1 changed files with 2 additions and 5 deletions
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7
fs/erofs/zdata.c
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@ -528,8 +528,6 @@ struct z_erofs_decompress_frontend {
z_erofs_next_pcluster_t owned_head;
enum z_erofs_pclustermode mode;
/* used for applying cache strategy on the fly */
bool backmost;
erofs_off_t headoffset;
/* a pointer used to pick up inplace I/O pages */
@ -538,7 +536,7 @@ struct z_erofs_decompress_frontend {
#define DECOMPRESS_FRONTEND_INIT(__i) { \
.inode = __i, .owned_head = Z_EROFS_PCLUSTER_TAIL, \
.mode = Z_EROFS_PCLUSTER_FOLLOWED, .backmost = true }
.mode = Z_EROFS_PCLUSTER_FOLLOWED }
static bool z_erofs_should_alloc_cache(struct z_erofs_decompress_frontend *fe)
{
@ -547,7 +545,7 @@ static bool z_erofs_should_alloc_cache(struct z_erofs_decompress_frontend *fe)
if (cachestrategy <= EROFS_ZIP_CACHE_DISABLED)
return false;
if (fe->backmost)
if (!(fe->map.m_flags & EROFS_MAP_FULL_MAPPED))
return true;
if (cachestrategy >= EROFS_ZIP_CACHE_READAROUND &&
@ -940,7 +938,6 @@ static void z_erofs_pcluster_end(struct z_erofs_decompress_frontend *fe)
erofs_workgroup_put(&pcl->obj);
fe->pcl = NULL;
fe->backmost = false;
}
static int z_erofs_read_fragment(struct super_block *sb, struct page *page,