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f2fs: optimize case-insensitive lookups

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This patch ports below casefold enhancement patch from ext4 to f2fs

commit 3ae72562ad ("ext4: optimize case-insensitive lookups")

Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Chao Yu 2019-08-21 23:13:35 +08:00 committed by Jaegeuk Kim
parent fe76a166a1
commit 950d47f233
2 changed files with 53 additions and 7 deletions
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57
fs/f2fs/dir.c
View File

@ -112,13 +112,17 @@ static struct f2fs_dir_entry *find_in_block(struct inode *dir,
* doesn't match or less than zero on error.
*/
int f2fs_ci_compare(const struct inode *parent, const struct qstr *name,
const struct qstr *entry)
const struct qstr *entry, bool quick)
{
const struct f2fs_sb_info *sbi = F2FS_SB(parent->i_sb);
const struct unicode_map *um = sbi->s_encoding;
int ret;
ret = utf8_strncasecmp(um, name, entry);
if (quick)
ret = utf8_strncasecmp_folded(um, name, entry);
else
ret = utf8_strncasecmp(um, name, entry);
if (ret < 0) {
/* Handle invalid character sequence as either an error
* or as an opaque byte sequence.
@ -134,11 +138,36 @@ int f2fs_ci_compare(const struct inode *parent, const struct qstr *name,
return ret;
}
static void f2fs_fname_setup_ci_filename(struct inode *dir,
const struct qstr *iname,
struct fscrypt_str *cf_name)
{
struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
if (!IS_CASEFOLDED(dir)) {
cf_name->name = NULL;
return;
}
cf_name->name = f2fs_kmalloc(sbi, F2FS_NAME_LEN, GFP_NOFS);
if (!cf_name->name)
return;
cf_name->len = utf8_casefold(sbi->s_encoding,
iname, cf_name->name,
F2FS_NAME_LEN);
if ((int)cf_name->len <= 0) {
kvfree(cf_name->name);
cf_name->name = NULL;
}
}
#endif
static inline bool f2fs_match_name(struct f2fs_dentry_ptr *d,
struct f2fs_dir_entry *de,
struct fscrypt_name *fname,
struct fscrypt_str *cf_str,
unsigned long bit_pos,
f2fs_hash_t namehash)
{
@ -155,8 +184,15 @@ static inline bool f2fs_match_name(struct f2fs_dentry_ptr *d,
entry.name = d->filename[bit_pos];
entry.len = de->name_len;
if (sbi->s_encoding && IS_CASEFOLDED(parent))
return !f2fs_ci_compare(parent, fname->usr_fname, &entry);
if (sbi->s_encoding && IS_CASEFOLDED(parent)) {
if (cf_str->name) {
struct qstr cf = {.name = cf_str->name,
.len = cf_str->len};
return !f2fs_ci_compare(parent, &cf, &entry, true);
}
return !f2fs_ci_compare(parent, fname->usr_fname, &entry,
false);
}
#endif
if (fscrypt_match_name(fname, d->filename[bit_pos],
le16_to_cpu(de->name_len)))
@ -169,9 +205,14 @@ struct f2fs_dir_entry *f2fs_find_target_dentry(struct fscrypt_name *fname,
struct f2fs_dentry_ptr *d)
{
struct f2fs_dir_entry *de;
struct fscrypt_str cf_str = { .name = NULL, .len = 0 };
unsigned long bit_pos = 0;
int max_len = 0;
#ifdef CONFIG_UNICODE
f2fs_fname_setup_ci_filename(d->inode, fname->usr_fname, &cf_str);
#endif
if (max_slots)
*max_slots = 0;
while (bit_pos < d->max) {
@ -188,7 +229,7 @@ struct f2fs_dir_entry *f2fs_find_target_dentry(struct fscrypt_name *fname,
continue;
}
if (f2fs_match_name(d, de, fname, bit_pos, namehash))
if (f2fs_match_name(d, de, fname, &cf_str, bit_pos, namehash))
goto found;
if (max_slots && max_len > *max_slots)
@ -202,6 +243,10 @@ struct f2fs_dir_entry *f2fs_find_target_dentry(struct fscrypt_name *fname,
found:
if (max_slots && max_len > *max_slots)
*max_slots = max_len;
#ifdef CONFIG_UNICODE
kvfree(cf_str.name);
#endif
return de;
}
@ -1025,7 +1070,7 @@ static int f2fs_d_compare(const struct dentry *dentry, unsigned int len,
return memcmp(str, name, len);
}
return f2fs_ci_compare(dentry->d_parent->d_inode, name, &qstr);
return f2fs_ci_compare(dentry->d_parent->d_inode, name, &qstr, false);
}
static int f2fs_d_hash(const struct dentry *dentry, struct qstr *str)

3
fs/f2fs/f2fs.h
View File

@ -2941,7 +2941,8 @@ struct dentry *f2fs_get_parent(struct dentry *child);
extern int f2fs_ci_compare(const struct inode *parent,
const struct qstr *name,
const struct qstr *entry);
const struct qstr *entry,
bool quick);
/*
* dir.c