On Mon, Mar 03, 2025 at 11:46:06AM +0800, Chao Yu via Linux-f2fs-devel wrote:
> This patch introduces a new flag F2FS_NOLINEAR_LOOKUP_FL, so that we can
> tag casefolded directory w/ it to disable linear lookup functionality,
> it can be used for QA.
>
> Signed-off-by: Chao Yu <c...@kernel.org>
> ---
> fs/f2fs/dir.c | 3 ++-
> fs/f2fs/f2fs.h | 2 ++
> fs/f2fs/file.c | 36 +++++++++++++++++++++++-------------
> include/uapi/linux/f2fs.h | 5 +++++
> 4 files changed, 32 insertions(+), 14 deletions(-)
>
> diff --git a/fs/f2fs/dir.c b/fs/f2fs/dir.c
> index 54dd52de7269..4c74f29a2c73 100644
> --- a/fs/f2fs/dir.c
> +++ b/fs/f2fs/dir.c
> @@ -366,7 +366,8 @@ struct f2fs_dir_entry *__f2fs_find_entry(struct inode
> *dir,
>
> out:
> #if IS_ENABLED(CONFIG_UNICODE)
> - if (IS_CASEFOLDED(dir) && !de && use_hash) {
> + if (IS_CASEFOLDED(dir) && !de && use_hash &&
> + !IS_NOLINEAR_LOOKUP(dir)) {
> use_hash = false;
> goto start_find_entry;
> }
> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> index 05879c6dc4d6..787f1e5a52d7 100644
> --- a/fs/f2fs/f2fs.h
> +++ b/fs/f2fs/f2fs.h
> @@ -3047,6 +3047,7 @@ static inline void f2fs_change_bit(unsigned int nr,
> char *addr)
> #define F2FS_NOCOMP_FL 0x00000400 /* Don't compress */
> #define F2FS_INDEX_FL 0x00001000 /* hash-indexed
> directory */
> #define F2FS_DIRSYNC_FL 0x00010000 /* dirsync behaviour
> (directories only) */
> +#define F2FS_NOLINEAR_LOOKUP_FL 0x08000000 /* do not use linear
> lookup */
> #define F2FS_PROJINHERIT_FL 0x20000000 /* Create with parents
> projid */
> #define F2FS_CASEFOLD_FL 0x40000000 /* Casefolded file */
> #define F2FS_DEVICE_ALIAS_FL 0x80000000 /* File for aliasing a
> device */
> @@ -3066,6 +3067,7 @@ static inline void f2fs_change_bit(unsigned int nr,
> char *addr)
> #define F2FS_OTHER_FLMASK (F2FS_NODUMP_FL | F2FS_NOATIME_FL)
>
> #define IS_DEVICE_ALIASING(inode) (F2FS_I(inode)->i_flags &
> F2FS_DEVICE_ALIAS_FL)
> +#define IS_NOLINEAR_LOOKUP(inode) (F2FS_I(inode)->i_flags &
> F2FS_NOLINEAR_LOOKUP_FL)
>
> static inline __u32 f2fs_mask_flags(umode_t mode, __u32 flags)
> {
> diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
> index 014cb7660a9a..1acddc4d11e4 100644
> --- a/fs/f2fs/file.c
> +++ b/fs/f2fs/file.c
> @@ -2062,6 +2062,11 @@ static int f2fs_setflags_common(struct inode *inode,
> u32 iflags, u32 mask)
> }
> }
>
> + if ((iflags ^ masked_flags) & F2FS_NOLINEAR_LOOKUP_FLAG) {
> + if (!S_ISDIR(inode->i_mode) || !IS_CASEFOLDED(inode))
> + return -EINVAL;
> + }
> +
> fi->i_flags = iflags | (fi->i_flags & ~mask);
> f2fs_bug_on(F2FS_I_SB(inode), (fi->i_flags & F2FS_COMPR_FL) &&
> (fi->i_flags & F2FS_NOCOMP_FL));
> @@ -2093,17 +2098,18 @@ static const struct {
> u32 iflag;
> u32 fsflag;
> } f2fs_fsflags_map[] = {
> - { F2FS_COMPR_FL, FS_COMPR_FL },
> - { F2FS_SYNC_FL, FS_SYNC_FL },
> - { F2FS_IMMUTABLE_FL, FS_IMMUTABLE_FL },
> - { F2FS_APPEND_FL, FS_APPEND_FL },
> - { F2FS_NODUMP_FL, FS_NODUMP_FL },
> - { F2FS_NOATIME_FL, FS_NOATIME_FL },
> - { F2FS_NOCOMP_FL, FS_NOCOMP_FL },
> - { F2FS_INDEX_FL, FS_INDEX_FL },
> - { F2FS_DIRSYNC_FL, FS_DIRSYNC_FL },
> - { F2FS_PROJINHERIT_FL, FS_PROJINHERIT_FL },
> - { F2FS_CASEFOLD_FL, FS_CASEFOLD_FL },
> + { F2FS_COMPR_FL, FS_COMPR_FL },
> + { F2FS_SYNC_FL, FS_SYNC_FL },
> + { F2FS_IMMUTABLE_FL, FS_IMMUTABLE_FL },
> + { F2FS_APPEND_FL, FS_APPEND_FL },
> + { F2FS_NODUMP_FL, FS_NODUMP_FL },
> + { F2FS_NOATIME_FL, FS_NOATIME_FL },
> + { F2FS_NOCOMP_FL, FS_NOCOMP_FL },
> + { F2FS_INDEX_FL, FS_INDEX_FL },
> + { F2FS_DIRSYNC_FL, FS_DIRSYNC_FL },
> + { F2FS_PROJINHERIT_FL, FS_PROJINHERIT_FL },
> + { F2FS_CASEFOLD_FL, FS_CASEFOLD_FL },
> + { F2FS_NOLINEAR_LOOKUP_FL, F2FS_NOLINEAR_LOOKUP_FL },
> };
>
> #define F2FS_GETTABLE_FS_FL ( \
> @@ -2121,7 +2127,8 @@ static const struct {
> FS_INLINE_DATA_FL | \
> FS_NOCOW_FL | \
> FS_VERITY_FL | \
> - FS_CASEFOLD_FL)
> + FS_CASEFOLD_FL | \
> + F2FS_NOLINEAR_LOOKUP_FL)
>
> #define F2FS_SETTABLE_FS_FL ( \
> FS_COMPR_FL | \
> @@ -2133,7 +2140,8 @@ static const struct {
> FS_NOCOMP_FL | \
> FS_DIRSYNC_FL | \
> FS_PROJINHERIT_FL | \
> - FS_CASEFOLD_FL)
> + FS_CASEFOLD_FL | \
> + F2FS_NOLINEAR_LOOKUP_FL)
>
> /* Convert f2fs on-disk i_flags to FS_IOC_{GET,SET}FLAGS flags */
> static inline u32 f2fs_iflags_to_fsflags(u32 iflags)
> @@ -3344,6 +3352,8 @@ int f2fs_fileattr_get(struct dentry *dentry, struct
> fileattr *fa)
> fsflags |= FS_INLINE_DATA_FL;
> if (is_inode_flag_set(inode, FI_PIN_FILE))
> fsflags |= FS_NOCOW_FL;
> + if (IS_NOLINEAR_LOOKUP(inode))
> + fsflags |= F2FS_NOLINEAR_LOOKUP_FL;
>
> fileattr_fill_flags(fa, fsflags & F2FS_GETTABLE_FS_FL);
>
> diff --git a/include/uapi/linux/f2fs.h b/include/uapi/linux/f2fs.h
> index 795e26258355..a03626fdcf35 100644
> --- a/include/uapi/linux/f2fs.h
> +++ b/include/uapi/linux/f2fs.h
> @@ -104,4 +104,9 @@ struct f2fs_comp_option {
> __u8 log_cluster_size;
> };
>
> +/* used for FS_IOC_GETFLAGS and FS_IOC_SETFLAGS */
> +enum {
> + F2FS_NOLINEAR_LOOKUP_FLAG = 0x08000000,
> +};
FS_IOC_GETFLAGS and FS_IOC_SETFLAGS are not filesystem-specific, and the
supported flags are declared in include/uapi/linux/fs.h. You can't just
randomly give an unused bit a filesystem specific meaning.
- Eric
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