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| author | Tetsuhiro Kohada <kohada.tetsuhiro@dc.mitsubishielectric.co.jp> | 2020-05-20 16:56:41 +0900 |
|---|---|---|
| committer | Namjae Jeon <namjae.jeon@samsung.com> | 2020-06-09 16:49:05 +0900 |
| commit | 943af1fdacfebe4ff13430655abc460a5e1072f7 (patch) | |
| tree | f11c323bba0aae808b76cc1a9cbedf107faeddd0 /fs/exfat/exfat_fs.h | |
| parent | ed0f84d30ba65f44bed2739572c7ab0fdeed4004 (diff) | |
| download | linux-943af1fdacfebe4ff13430655abc460a5e1072f7.tar.gz | |
exfat: optimize dir-cache
Optimize directory access based on exfat_entry_set_cache. - Hold bh instead of copied d-entry. - Modify bh->data directly instead of the copied d-entry. - Write back the retained bh instead of rescanning the d-entry-set. And - Remove unused cache related definitions. Signed-off-by: Tetsuhiro Kohada <kohada.tetsuhiro@dc.mitsubishielectric.co.jp> Reviewed-by: Sungjong Seo <sj1557.seo@samsung.com> Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>
Diffstat (limited to 'fs/exfat/exfat_fs.h')
| -rw-r--r-- | fs/exfat/exfat_fs.h | 27 |
1 files changed, 12 insertions, 15 deletions
diff --git a/fs/exfat/exfat_fs.h b/fs/exfat/exfat_fs.h index 294aa7792bc3..c84ae9e60508 100644 --- a/fs/exfat/exfat_fs.h +++ b/fs/exfat/exfat_fs.h @@ -71,10 +71,8 @@ enum { #define MAX_NAME_LENGTH 255 /* max len of file name excluding NULL */ #define MAX_VFSNAME_BUF_SIZE ((MAX_NAME_LENGTH + 1) * MAX_CHARSET_SIZE) -#define FAT_CACHE_SIZE 128 -#define FAT_CACHE_HASH_SIZE 64 -#define BUF_CACHE_SIZE 256 -#define BUF_CACHE_HASH_SIZE 64 +/* Enough size to hold 256 dentry (even 512 Byte sector) */ +#define DIR_CACHE_SIZE (256*sizeof(struct exfat_dentry)/512+1) #define EXFAT_HINT_NONE -1 #define EXFAT_MIN_SUBDIR 2 @@ -170,14 +168,12 @@ struct exfat_hint { }; struct exfat_entry_set_cache { - /* sector number that contains file_entry */ - sector_t sector; - /* byte offset in the sector */ - unsigned int offset; - /* flag in stream entry. 01 for cluster chain, 03 for contig. */ - int alloc_flag; + struct super_block *sb; + bool modified; + unsigned int start_off; + int num_bh; + struct buffer_head *bh[DIR_CACHE_SIZE]; unsigned int num_entries; - struct exfat_dentry entries[]; }; struct exfat_dir_entry { @@ -451,8 +447,7 @@ int exfat_remove_entries(struct inode *inode, struct exfat_chain *p_dir, int entry, int order, int num_entries); int exfat_update_dir_chksum(struct inode *inode, struct exfat_chain *p_dir, int entry); -int exfat_update_dir_chksum_with_entry_set(struct super_block *sb, - struct exfat_entry_set_cache *es, int sync); +void exfat_update_dir_chksum_with_entry_set(struct exfat_entry_set_cache *es); int exfat_calc_num_entries(struct exfat_uni_name *p_uniname); int exfat_find_dir_entry(struct super_block *sb, struct exfat_inode_info *ei, struct exfat_chain *p_dir, struct exfat_uni_name *p_uniname, @@ -463,9 +458,11 @@ int exfat_find_location(struct super_block *sb, struct exfat_chain *p_dir, struct exfat_dentry *exfat_get_dentry(struct super_block *sb, struct exfat_chain *p_dir, int entry, struct buffer_head **bh, sector_t *sector); +struct exfat_dentry *exfat_get_dentry_cached(struct exfat_entry_set_cache *es, + int num); struct exfat_entry_set_cache *exfat_get_dentry_set(struct super_block *sb, - struct exfat_chain *p_dir, int entry, unsigned int type, - struct exfat_dentry **file_ep); + struct exfat_chain *p_dir, int entry, unsigned int type); +void exfat_free_dentry_set(struct exfat_entry_set_cache *es, int sync); int exfat_count_dir_entries(struct super_block *sb, struct exfat_chain *p_dir); /* inode.c */ |