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Date: Wed, 8 Jul 2020 10:08:42 -0700
From: Jaegeuk Kim <jaegeuk@...nel.org>
To: Daniel Rosenberg <drosen@...gle.com>
Cc: Theodore Ts'o <tytso@....edu>, linux-ext4@...r.kernel.org,
Chao Yu <chao@...nel.org>,
linux-f2fs-devel@...ts.sourceforge.net,
Eric Biggers <ebiggers@...nel.org>,
linux-fscrypt@...r.kernel.org,
Alexander Viro <viro@...iv.linux.org.uk>,
Andreas Dilger <adilger.kernel@...ger.ca>,
linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
Gabriel Krisman Bertazi <krisman@...labora.com>,
kernel-team@...roid.com, Eric Biggers <ebiggers@...gle.com>
Subject: Re: [PATCH v12 3/4] f2fs: Use generic casefolding support
On 07/08, Daniel Rosenberg wrote:
> This switches f2fs over to the generic support provided in
> the previous patch.
>
> Since casefolded dentries behave the same in ext4 and f2fs, we decrease
> the maintenance burden by unifying them, and any optimizations will
> immediately apply to both.
>
> Signed-off-by: Daniel Rosenberg <drosen@...gle.com>
> Reviewed-by: Eric Biggers <ebiggers@...gle.com>
Acked-by: Jaegeuk Kim <jaegeuk@...nel.org>
> ---
> fs/f2fs/dir.c | 84 +++++------------------------------------
> fs/f2fs/f2fs.h | 4 --
> fs/f2fs/super.c | 10 ++---
> fs/f2fs/sysfs.c | 10 +++--
> include/linux/f2fs_fs.h | 3 --
> 5 files changed, 20 insertions(+), 91 deletions(-)
>
> diff --git a/fs/f2fs/dir.c b/fs/f2fs/dir.c
> index d35976785e8c..ff61f3a9c11d 100644
> --- a/fs/f2fs/dir.c
> +++ b/fs/f2fs/dir.c
> @@ -75,21 +75,22 @@ int f2fs_init_casefolded_name(const struct inode *dir,
> struct f2fs_filename *fname)
> {
> #ifdef CONFIG_UNICODE
> - struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
> + struct super_block *sb = dir->i_sb;
> + struct f2fs_sb_info *sbi = F2FS_SB(sb);
>
> if (IS_CASEFOLDED(dir)) {
> fname->cf_name.name = f2fs_kmalloc(sbi, F2FS_NAME_LEN,
> GFP_NOFS);
> if (!fname->cf_name.name)
> return -ENOMEM;
> - fname->cf_name.len = utf8_casefold(sbi->s_encoding,
> + fname->cf_name.len = utf8_casefold(sb->s_encoding,
> fname->usr_fname,
> fname->cf_name.name,
> F2FS_NAME_LEN);
> if ((int)fname->cf_name.len <= 0) {
> kfree(fname->cf_name.name);
> fname->cf_name.name = NULL;
> - if (f2fs_has_strict_mode(sbi))
> + if (sb_has_strict_encoding(sb))
> return -EINVAL;
> /* fall back to treating name as opaque byte sequence */
> }
> @@ -215,8 +216,8 @@ static struct f2fs_dir_entry *find_in_block(struct inode *dir,
> static bool f2fs_match_ci_name(const struct inode *dir, const struct qstr *name,
> const u8 *de_name, u32 de_name_len)
> {
> - const struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
> - const struct unicode_map *um = sbi->s_encoding;
> + const struct super_block *sb = dir->i_sb;
> + const struct unicode_map *um = sb->s_encoding;
> struct qstr entry = QSTR_INIT(de_name, de_name_len);
> int res;
>
> @@ -226,7 +227,7 @@ static bool f2fs_match_ci_name(const struct inode *dir, const struct qstr *name,
> * In strict mode, ignore invalid names. In non-strict mode,
> * fall back to treating them as opaque byte sequences.
> */
> - if (f2fs_has_strict_mode(sbi) || name->len != entry.len)
> + if (sb_has_strict_encoding(sb) || name->len != entry.len)
> return false;
> return !memcmp(name->name, entry.name, name->len);
> }
> @@ -1107,75 +1108,8 @@ const struct file_operations f2fs_dir_operations = {
> };
>
> #ifdef CONFIG_UNICODE
> -static int f2fs_d_compare(const struct dentry *dentry, unsigned int len,
> - const char *str, const struct qstr *name)
> -{
> - const struct dentry *parent = READ_ONCE(dentry->d_parent);
> - const struct inode *dir = READ_ONCE(parent->d_inode);
> - const struct f2fs_sb_info *sbi = F2FS_SB(dentry->d_sb);
> - struct qstr entry = QSTR_INIT(str, len);
> - char strbuf[DNAME_INLINE_LEN];
> - int res;
> -
> - if (!dir || !IS_CASEFOLDED(dir))
> - goto fallback;
> -
> - /*
> - * If the dentry name is stored in-line, then it may be concurrently
> - * modified by a rename. If this happens, the VFS will eventually retry
> - * the lookup, so it doesn't matter what ->d_compare() returns.
> - * However, it's unsafe to call utf8_strncasecmp() with an unstable
> - * string. Therefore, we have to copy the name into a temporary buffer.
> - */
> - if (len <= DNAME_INLINE_LEN - 1) {
> - memcpy(strbuf, str, len);
> - strbuf[len] = 0;
> - entry.name = strbuf;
> - /* prevent compiler from optimizing out the temporary buffer */
> - barrier();
> - }
> -
> - res = utf8_strncasecmp(sbi->s_encoding, name, &entry);
> - if (res >= 0)
> - return res;
> -
> - if (f2fs_has_strict_mode(sbi))
> - return -EINVAL;
> -fallback:
> - if (len != name->len)
> - return 1;
> - return !!memcmp(str, name->name, len);
> -}
> -
> -static int f2fs_d_hash(const struct dentry *dentry, struct qstr *str)
> -{
> - struct f2fs_sb_info *sbi = F2FS_SB(dentry->d_sb);
> - const struct unicode_map *um = sbi->s_encoding;
> - const struct inode *inode = READ_ONCE(dentry->d_inode);
> - unsigned char *norm;
> - int len, ret = 0;
> -
> - if (!inode || !IS_CASEFOLDED(inode))
> - return 0;
> -
> - norm = f2fs_kmalloc(sbi, PATH_MAX, GFP_ATOMIC);
> - if (!norm)
> - return -ENOMEM;
> -
> - len = utf8_casefold(um, str, norm, PATH_MAX);
> - if (len < 0) {
> - if (f2fs_has_strict_mode(sbi))
> - ret = -EINVAL;
> - goto out;
> - }
> - str->hash = full_name_hash(dentry, norm, len);
> -out:
> - kvfree(norm);
> - return ret;
> -}
> -
> const struct dentry_operations f2fs_dentry_ops = {
> - .d_hash = f2fs_d_hash,
> - .d_compare = f2fs_d_compare,
> + .d_hash = generic_ci_d_hash,
> + .d_compare = generic_ci_d_compare,
> };
> #endif
> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> index b35a50f4953c..d11ffe26bfde 100644
> --- a/fs/f2fs/f2fs.h
> +++ b/fs/f2fs/f2fs.h
> @@ -1402,10 +1402,6 @@ struct f2fs_sb_info {
> int valid_super_block; /* valid super block no */
> unsigned long s_flag; /* flags for sbi */
> struct mutex writepages; /* mutex for writepages() */
> -#ifdef CONFIG_UNICODE
> - struct unicode_map *s_encoding;
> - __u16 s_encoding_flags;
> -#endif
>
> #ifdef CONFIG_BLK_DEV_ZONED
> unsigned int blocks_per_blkz; /* F2FS blocks per zone */
> diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
> index 20e56b0fa46a..cca7a83ffa08 100644
> --- a/fs/f2fs/super.c
> +++ b/fs/f2fs/super.c
> @@ -1257,7 +1257,7 @@ static void f2fs_put_super(struct super_block *sb)
> for (i = 0; i < NR_PAGE_TYPE; i++)
> kvfree(sbi->write_io[i]);
> #ifdef CONFIG_UNICODE
> - utf8_unload(sbi->s_encoding);
> + utf8_unload(sb->s_encoding);
> #endif
> kvfree(sbi);
> }
> @@ -3278,7 +3278,7 @@ static int f2fs_scan_devices(struct f2fs_sb_info *sbi)
> static int f2fs_setup_casefold(struct f2fs_sb_info *sbi)
> {
> #ifdef CONFIG_UNICODE
> - if (f2fs_sb_has_casefold(sbi) && !sbi->s_encoding) {
> + if (f2fs_sb_has_casefold(sbi) && !sbi->sb->s_encoding) {
> const struct f2fs_sb_encodings *encoding_info;
> struct unicode_map *encoding;
> __u16 encoding_flags;
> @@ -3309,8 +3309,8 @@ static int f2fs_setup_casefold(struct f2fs_sb_info *sbi)
> "%s-%s with flags 0x%hx", encoding_info->name,
> encoding_info->version?:"\b", encoding_flags);
>
> - sbi->s_encoding = encoding;
> - sbi->s_encoding_flags = encoding_flags;
> + sbi->sb->s_encoding = encoding;
> + sbi->sb->s_encoding_flags = encoding_flags;
> sbi->sb->s_d_op = &f2fs_dentry_ops;
> }
> #else
> @@ -3806,7 +3806,7 @@ static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
> kvfree(sbi->write_io[i]);
>
> #ifdef CONFIG_UNICODE
> - utf8_unload(sbi->s_encoding);
> + utf8_unload(sb->s_encoding);
> #endif
> free_options:
> #ifdef CONFIG_QUOTA
> diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c
> index e877c59b9fdb..8bee99ab3978 100644
> --- a/fs/f2fs/sysfs.c
> +++ b/fs/f2fs/sysfs.c
> @@ -176,12 +176,14 @@ static ssize_t encoding_show(struct f2fs_attr *a,
> struct f2fs_sb_info *sbi, char *buf)
> {
> #ifdef CONFIG_UNICODE
> + struct super_block *sb = sbi->sb;
> +
> if (f2fs_sb_has_casefold(sbi))
> return snprintf(buf, PAGE_SIZE, "%s (%d.%d.%d)\n",
> - sbi->s_encoding->charset,
> - (sbi->s_encoding->version >> 16) & 0xff,
> - (sbi->s_encoding->version >> 8) & 0xff,
> - sbi->s_encoding->version & 0xff);
> + sb->s_encoding->charset,
> + (sb->s_encoding->version >> 16) & 0xff,
> + (sb->s_encoding->version >> 8) & 0xff,
> + sb->s_encoding->version & 0xff);
> #endif
> return sprintf(buf, "(none)");
> }
> diff --git a/include/linux/f2fs_fs.h b/include/linux/f2fs_fs.h
> index 3c383ddd92dd..a5dbb57a687f 100644
> --- a/include/linux/f2fs_fs.h
> +++ b/include/linux/f2fs_fs.h
> @@ -38,9 +38,6 @@
> #define F2FS_MAX_QUOTAS 3
>
> #define F2FS_ENC_UTF8_12_1 1
> -#define F2FS_ENC_STRICT_MODE_FL (1 << 0)
> -#define f2fs_has_strict_mode(sbi) \
> - (sbi->s_encoding_flags & F2FS_ENC_STRICT_MODE_FL)
>
> #define F2FS_IO_SIZE(sbi) (1 << F2FS_OPTION(sbi).write_io_size_bits) /* Blocks */
> #define F2FS_IO_SIZE_KB(sbi) (1 << (F2FS_OPTION(sbi).write_io_size_bits + 2)) /* KB */
> --
> 2.27.0.383.g050319c2ae-goog
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