f2fs: clean up i_compress_flag and i_compress_level usage

.i_compress_level was introduced by commit 3fde13f817e2 ("f2fs: compress:
support compress level"), but never be used.

This patch updates as below:
- load high 8-bits of on-disk .i_compress_flag to in-memory .i_compress_level
- load low 8-bits of on-disk .i_compress_flag to in-memory .i_compress_flag
- change type of in-memory .i_compress_flag from unsigned short to unsigned
char.

w/ above changes, we can avoid unneeded bit shift whenever during
.init_compress_ctx(), and shrink size of struct f2fs_inode_info.

Signed-off-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

diff --git a/fs/f2fs/compress.c b/fs/f2fs/compress.c
index a469cdd..e4851f7 100644 (file)
--- a/fs/f2fs/compress.c
+++ b/fs/f2fs/compress.c
@@ -241,7 +241,7 @@ static int lz4_init_compress_ctx(struct compress_ctx *cc)
        unsigned int size = LZ4_MEM_COMPRESS;
 
 #ifdef CONFIG_F2FS_FS_LZ4HC
-       if (F2FS_I(cc->inode)->i_compress_flag >> COMPRESS_LEVEL_OFFSET)
+       if (F2FS_I(cc->inode)->i_compress_level)
                size = LZ4HC_MEM_COMPRESS;
 #endif
 
@@ -267,8 +267,7 @@ static void lz4_destroy_compress_ctx(struct compress_ctx *cc)
 #ifdef CONFIG_F2FS_FS_LZ4HC
 static int lz4hc_compress_pages(struct compress_ctx *cc)
 {
-       unsigned char level = F2FS_I(cc->inode)->i_compress_flag >>
-                                               COMPRESS_LEVEL_OFFSET;
+       unsigned char level = F2FS_I(cc->inode)->i_compress_level;
        int len;
 
        if (level)
@@ -340,8 +339,7 @@ static int zstd_init_compress_ctx(struct compress_ctx *cc)
        zstd_cstream *stream;
        void *workspace;
        unsigned int workspace_size;
-       unsigned char level = F2FS_I(cc->inode)->i_compress_flag >>
-                                               COMPRESS_LEVEL_OFFSET;
+       unsigned char level = F2FS_I(cc->inode)->i_compress_level;
 
        if (!level)
                level = F2FS_ZSTD_DEFAULT_CLEVEL;

diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 5449c82..e801443 100644 (file)
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -869,7 +869,7 @@ struct f2fs_inode_info {
        unsigned char i_compress_algorithm;     /* algorithm type */
        unsigned char i_log_cluster_size;       /* log of cluster size */
        unsigned char i_compress_level;         /* compress level (lz4hc,zstd) */
-       unsigned short i_compress_flag;         /* compress flag */
+       unsigned char i_compress_flag;          /* compress flag */
        unsigned int i_cluster_size;            /* cluster size */
 
        unsigned int atomic_write_cnt;
@@ -4358,9 +4358,8 @@ static inline int set_compress_context(struct inode *inode)
        if ((F2FS_I(inode)->i_compress_algorithm == COMPRESS_LZ4 ||
                F2FS_I(inode)->i_compress_algorithm == COMPRESS_ZSTD) &&
                        F2FS_OPTION(sbi).compress_level)
-               F2FS_I(inode)->i_compress_flag |=
-                               F2FS_OPTION(sbi).compress_level <<
-                               COMPRESS_LEVEL_OFFSET;
+               F2FS_I(inode)->i_compress_level =
+                               F2FS_OPTION(sbi).compress_level;
        F2FS_I(inode)->i_flags |= F2FS_COMPR_FL;
        set_inode_flag(inode, FI_COMPRESSED_FILE);
        stat_inc_compr_inode(inode);

diff --git a/fs/f2fs/inode.c b/fs/f2fs/inode.c
index fd2ee55..61a991b 100644 (file)
--- a/fs/f2fs/inode.c
+++ b/fs/f2fs/inode.c
@@ -460,11 +460,17 @@ static int do_read_inode(struct inode *inode)
                                        (fi->i_flags & F2FS_COMPR_FL)) {
                if (F2FS_FITS_IN_INODE(ri, fi->i_extra_isize,
                                        i_log_cluster_size)) {
+                       unsigned short compress_flag;
+
                        atomic_set(&fi->i_compr_blocks,
                                        le64_to_cpu(ri->i_compr_blocks));
                        fi->i_compress_algorithm = ri->i_compress_algorithm;
                        fi->i_log_cluster_size = ri->i_log_cluster_size;
-                       fi->i_compress_flag = le16_to_cpu(ri->i_compress_flag);
+                       compress_flag = le16_to_cpu(ri->i_compress_flag);
+                       fi->i_compress_level = compress_flag >>
+                                               COMPRESS_LEVEL_OFFSET;
+                       fi->i_compress_flag = compress_flag &
+                                       (BIT(COMPRESS_LEVEL_OFFSET) - 1);
                        fi->i_cluster_size = 1 << fi->i_log_cluster_size;
                        set_inode_flag(inode, FI_COMPRESSED_FILE);
                }
@@ -686,13 +692,17 @@ void f2fs_update_inode(struct inode *inode, struct page *node_page)
                if (f2fs_sb_has_compression(F2FS_I_SB(inode)) &&
                        F2FS_FITS_IN_INODE(ri, F2FS_I(inode)->i_extra_isize,
                                                        i_log_cluster_size)) {
+                       unsigned short compress_flag;
+
                        ri->i_compr_blocks =
                                cpu_to_le64(atomic_read(
                                        &F2FS_I(inode)->i_compr_blocks));
                        ri->i_compress_algorithm =
                                F2FS_I(inode)->i_compress_algorithm;
-                       ri->i_compress_flag =
-                               cpu_to_le16(F2FS_I(inode)->i_compress_flag);
+                       compress_flag = F2FS_I(inode)->i_compress_flag |
+                               F2FS_I(inode)->i_compress_level <<
+                                               COMPRESS_LEVEL_OFFSET;
+                       ri->i_compress_flag = cpu_to_le16(compress_flag);
                        ri->i_log_cluster_size =
                                F2FS_I(inode)->i_log_cluster_size;
                }