Re: [f2fs-dev] [PATCH v2] f2fs: add an ioctl to disable GC for specific file

From: Jaegeuk Kim
Date: Tue Dec 19 2017 - 17:52:13 EST

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In reply to: Chao Yu: "Re: [f2fs-dev] [PATCH v2] f2fs: add an ioctl to disable GC for specific file"
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On 12/18, Chao Yu wrote:
> On 2017/12/15 3:50, Jaegeuk Kim wrote:
> > On 12/12, Chao Yu wrote:
> >> Hi Jaegeuk,
> >>
> >> On 2017/12/9 3:37, Jaegeuk Kim wrote:
> >>> Change log from v1:
> >>> - fix bug in error handling of ioctl
> >>>
> >>> >From b905e03d8aad7d25ecaf9bde05411a68d3d2460e Mon Sep 17 00:00:00 2001
> >>> From: Jaegeuk Kim <jaegeuk@xxxxxxxxxx>
> >>> Date: Thu, 7 Dec 2017 16:25:39 -0800
> >>> Subject: [PATCH] f2fs: add an ioctl to disable GC for specific file
> >>>
> >>> This patch gives a flag to disable GC on given file, which would be useful, when
> >>> user wants to keep its block map.
> >>
> >> Could you add some description about in which scenario userspace application
> >> can use this ioctl, otherwise than android, other developers can get hint about
> >> the usage of this interface, maybe later it can be used more wildly. ;)
> >
> > The usecase would be somewhat hacky tho, it looks like 1) building a block map
> > through fibmap, 2) storing the map in another partition, 3) using the map to
> > overwrite data contents directly by low-level tools. In that case, we have to
> > keep its block locations.
>
> That's so hacky, it will be better to add simple description in comment log. ;)

Actually, I don't want to add this kind of hacky example. :P

> >>> Signed-off-by: Jaegeuk Kim <jaegeuk@xxxxxxxxxx>
> >>> ---
> >>> fs/f2fs/f2fs.h | 17 ++++++++++++++++
> >>> fs/f2fs/file.c | 54 +++++++++++++++++++++++++++++++++++++++++++++++++
> >>> fs/f2fs/gc.c | 11 ++++++++++
> >>> fs/f2fs/gc.h | 2 ++
> >>> fs/f2fs/sysfs.c | 2 ++
> >>> include/linux/f2fs_fs.h | 1 +
> >>> 6 files changed, 87 insertions(+)
> >>>
> >>> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> >>> index 82f1dc345505..dd76cbf02791 100644
> >>> --- a/fs/f2fs/f2fs.h
> >>> +++ b/fs/f2fs/f2fs.h
> >>> @@ -375,6 +375,8 @@ static inline bool __has_cursum_space(struct f2fs_journal *journal,
> >>> #define F2FS_IOC_FSGETXATTR FS_IOC_FSGETXATTR
> >>> #define F2FS_IOC_FSSETXATTR FS_IOC_FSSETXATTR
> >>>
> >>> +#define F2FS_IOC_SET_DONTMOVE _IO(F2FS_IOCTL_MAGIC, 13)
> >>> +
> >>> struct f2fs_gc_range {
> >>> u32 sync;
> >>> u64 start;
> >>> @@ -1129,6 +1131,9 @@ struct f2fs_sb_info {
> >>> /* threshold for converting bg victims for fg */
> >>> u64 fggc_threshold;
> >>>
> >>> + /* threshold for dontmove gc trials */
> >>> + u64 gc_dontmove;
> >>> +
> >>> /* maximum # of trials to find a victim segment for SSR and GC */
> >>> unsigned int max_victim_search;
> >>>
> >>> @@ -2104,6 +2109,7 @@ enum {
> >>> FI_HOT_DATA, /* indicate file is hot */
> >>> FI_EXTRA_ATTR, /* indicate file has extra attribute */
> >>> FI_PROJ_INHERIT, /* indicate file inherits projectid */
> >>> + FI_DONTMOVE, /* indicate file should not be gced */
> >>> };
> >>>
> >>> static inline void __mark_inode_dirty_flag(struct inode *inode,
> >>> @@ -2117,6 +2123,7 @@ static inline void __mark_inode_dirty_flag(struct inode *inode,
> >>> return;
> >>> case FI_DATA_EXIST:
> >>> case FI_INLINE_DOTS:
> >>> + case FI_DONTMOVE:
> >>> f2fs_mark_inode_dirty_sync(inode, true);
> >>> }
> >>> }
> >>> @@ -2225,6 +2232,8 @@ static inline void get_inline_info(struct inode *inode, struct f2fs_inode *ri)
> >>> set_bit(FI_INLINE_DOTS, &fi->flags);
> >>> if (ri->i_inline & F2FS_EXTRA_ATTR)
> >>> set_bit(FI_EXTRA_ATTR, &fi->flags);
> >>> + if (ri->i_inline & F2FS_DONTMOVE)
> >>> + set_bit(FI_DONTMOVE, &fi->flags);
> >>> }
> >>>
> >>> static inline void set_raw_inline(struct inode *inode, struct f2fs_inode *ri)
> >>> @@ -2243,6 +2252,8 @@ static inline void set_raw_inline(struct inode *inode, struct f2fs_inode *ri)
> >>> ri->i_inline |= F2FS_INLINE_DOTS;
> >>> if (is_inode_flag_set(inode, FI_EXTRA_ATTR))
> >>> ri->i_inline |= F2FS_EXTRA_ATTR;
> >>> + if (is_inode_flag_set(inode, FI_DONTMOVE))
> >>> + ri->i_inline |= F2FS_DONTMOVE;
> >>> }
> >>>
> >>> static inline int f2fs_has_extra_attr(struct inode *inode)
> >>> @@ -2288,6 +2299,11 @@ static inline int f2fs_has_inline_dots(struct inode *inode)
> >>> return is_inode_flag_set(inode, FI_INLINE_DOTS);
> >>> }
> >>>
> >>> +static inline bool f2fs_is_dontmove_file(struct inode *inode)
> >>> +{
> >>> + return is_inode_flag_set(inode, FI_DONTMOVE);
> >>> +}
> >>> +
> >>> static inline bool f2fs_is_atomic_file(struct inode *inode)
> >>> {
> >>> return is_inode_flag_set(inode, FI_ATOMIC_FILE);
> >>> @@ -2503,6 +2519,7 @@ int truncate_hole(struct inode *inode, pgoff_t pg_start, pgoff_t pg_end);
> >>> void truncate_data_blocks_range(struct dnode_of_data *dn, int count);
> >>> long f2fs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg);
> >>> long f2fs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
> >>> +int f2fs_dontmove_control(struct inode *inode, bool inc);
> >>>
> >>> /*
> >>> * inode.c
> >>> diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
> >>> index 1db68f1bcd77..e232f8d91f6f 100644
> >>> --- a/fs/f2fs/file.c
> >>> +++ b/fs/f2fs/file.c
> >>> @@ -2666,6 +2666,57 @@ static int f2fs_ioc_fssetxattr(struct file *filp, unsigned long arg)
> >>> return 0;
> >>> }
> >>>
> >>> +int f2fs_dontmove_control(struct inode *inode, bool inc)
>
> What's the purpose here? If GC tries to move block belong to unremovable inode,
> we don't allow to set other inode as unremovable one?

I just wanted to avoid infinite loop to move this during foreground GC case.

>
> >>> +{
> >>> + struct f2fs_inode_info *fi = F2FS_I(inode);
> >>> + struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
> >>> +
> >>> + /* Use i_current_depth for normal file as a risk signal. */
> >>> + if (inc)
> >>> + f2fs_i_depth_write(inode, fi->i_current_depth + 1);
> >>> +
> >>> + if (fi->i_current_depth > sbi->gc_dontmove) {
>
> If we want to persist per-inode metadata, what about adding new field in inode
> layout to store such metadata?

I thought that this would not be such the important field which makes us extend
inode fields.

Thanks,

>
> Thanks,
>
> >>> + f2fs_msg(sbi->sb, KERN_WARNING,
> >>> + "%s: Enable GC = ino %lx after %x GC trials\n",
> >>> + __func__, inode->i_ino, fi->i_current_depth);
> >>> + return -EAGAIN;
> >>> + }
> >>> + return 0;
> >>> +}
> >>> +
> >>> +static int f2fs_ioc_set_dontmove(struct file *filp)
> >>> +{
> >>> + struct inode *inode = file_inode(filp);
> >>> + int ret;
> >>> +
> >>> + if (!inode_owner_or_capable(inode))
> >>> + return -EACCES;
> >>> +
> >>> + if (!S_ISREG(inode->i_mode))
> >>> + return -EINVAL;
> >>> +
> >>> + if (f2fs_readonly(F2FS_I_SB(inode)->sb))
> >>> + return -EROFS;
> >>> +
> >>> + inode_lock(inode);
> >>> +
> >>> + if (f2fs_dontmove_control(inode, false)) {
> >>> + ret = -EAGAIN;
> >>> + goto out;
> >>> + }
> >>> +
> >>> + ret = f2fs_convert_inline_inode(inode);
> >>> + if (ret)
> >>> + goto out;
> >>> +
> >>> + set_inode_flag(inode, FI_DONTMOVE);
> >>> + ret = F2FS_I(inode)->i_current_depth;
> >>> + f2fs_update_time(F2FS_I_SB(inode), REQ_TIME);
> >>> +out:
> >>> + inode_unlock(inode);
> >>> + return ret;
> >>> +}
> >>> +
> >>> long f2fs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
> >>> {
> >>> if (unlikely(f2fs_cp_error(F2FS_I_SB(file_inode(filp)))))
> >>> @@ -2716,6 +2767,8 @@ long f2fs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
> >>> return f2fs_ioc_fsgetxattr(filp, arg);
> >>> case F2FS_IOC_FSSETXATTR:
> >>> return f2fs_ioc_fssetxattr(filp, arg);
> >>> + case F2FS_IOC_SET_DONTMOVE:
> >>> + return f2fs_ioc_set_dontmove(filp);
> >>> default:
> >>> return -ENOTTY;
> >>> }
> >>> @@ -2791,6 +2844,7 @@ long f2fs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
> >>> case F2FS_IOC_GET_FEATURES:
> >>> case F2FS_IOC_FSGETXATTR:
> >>> case F2FS_IOC_FSSETXATTR:
> >>> + case F2FS_IOC_SET_DONTMOVE:
> >>> break;
> >>> default:
> >>> return -ENOIOCTLCMD;
> >>> diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
> >>> index 5d5bba462f26..263cb0b71ec8 100644
> >>> --- a/fs/f2fs/gc.c
> >>> +++ b/fs/f2fs/gc.c
> >>> @@ -624,6 +624,11 @@ static void move_data_block(struct inode *inode, block_t bidx,
> >>> if (f2fs_is_atomic_file(inode))
> >>> goto out;
> >>>
> >>> + if (f2fs_is_dontmove_file(inode)) {
> >>> + f2fs_dontmove_control(inode, false);
> >>> + goto out;
> >>> + }
> >>> +
> >>> set_new_dnode(&dn, inode, NULL, NULL, 0);
> >>> err = get_dnode_of_data(&dn, bidx, LOOKUP_NODE);
> >>> if (err)
> >>> @@ -720,6 +725,11 @@ static void move_data_page(struct inode *inode, block_t bidx, int gc_type,
> >>>
> >>> if (f2fs_is_atomic_file(inode))
> >>> goto out;
> >>> + if (f2fs_is_dontmove_file(inode)) {
> >>> + if (gc_type == FG_GC)
> >>> + f2fs_dontmove_control(inode, false);
> >>> + goto out;
> >>> + }
> >>>
> >>> if (gc_type == BG_GC) {
> >>> if (PageWriteback(page))
> >>> @@ -1091,6 +1101,7 @@ void build_gc_manager(struct f2fs_sb_info *sbi)
> >>>
> >>> sbi->fggc_threshold = div64_u64((main_count - ovp_count) *
> >>> BLKS_PER_SEC(sbi), (main_count - resv_count));
> >>> + sbi->gc_dontmove = DEF_GC_FAILED_DONTMOVE;
> >>>
> >>> /* give warm/cold data area from slower device */
> >>> if (sbi->s_ndevs && sbi->segs_per_sec == 1)
> >>> diff --git a/fs/f2fs/gc.h b/fs/f2fs/gc.h
> >>> index 9325191fab2d..3fbb74253e52 100644
> >>> --- a/fs/f2fs/gc.h
> >>> +++ b/fs/f2fs/gc.h
> >>> @@ -20,6 +20,8 @@
> >>> #define LIMIT_INVALID_BLOCK 40 /* percentage over total user space */
> >>> #define LIMIT_FREE_BLOCK 40 /* percentage over invalid + free space */
> >>>
> >>> +#define DEF_GC_FAILED_DONTMOVE 1024
> >>> +
> >>> /* Search max. number of dirty segments to select a victim segment */
> >>> #define DEF_MAX_VICTIM_SEARCH 4096 /* covers 8GB */
> >>>
> >>> diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c
> >>> index 93c3364250dd..57dd6660936a 100644
> >>> --- a/fs/f2fs/sysfs.c
> >>> +++ b/fs/f2fs/sysfs.c
> >>> @@ -300,6 +300,7 @@ F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, cp_interval, interval_time[CP_TIME]);
> >>> F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, idle_interval, interval_time[REQ_TIME]);
> >>> F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, iostat_enable, iostat_enable);
> >>> F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, readdir_ra, readdir_ra);
> >>> +F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, gc_dontmove, gc_dontmove);
> >>> #ifdef CONFIG_F2FS_FAULT_INJECTION
> >>> F2FS_RW_ATTR(FAULT_INFO_RATE, f2fs_fault_info, inject_rate, inject_rate);
> >>> F2FS_RW_ATTR(FAULT_INFO_TYPE, f2fs_fault_info, inject_type, inject_type);
> >>> @@ -348,6 +349,7 @@ static struct attribute *f2fs_attrs[] = {
> >>> ATTR_LIST(idle_interval),
> >>> ATTR_LIST(iostat_enable),
> >>> ATTR_LIST(readdir_ra),
> >>> + ATTR_LIST(gc_dontmove),
> >>> #ifdef CONFIG_F2FS_FAULT_INJECTION
> >>> ATTR_LIST(inject_rate),
> >>> ATTR_LIST(inject_type),
> >>> diff --git a/include/linux/f2fs_fs.h b/include/linux/f2fs_fs.h
> >>> index 43e98d30d2df..fedb2698a8f7 100644
> >>> --- a/include/linux/f2fs_fs.h
> >>> +++ b/include/linux/f2fs_fs.h
> >>> @@ -212,6 +212,7 @@ struct f2fs_extent {
> >>> #define F2FS_DATA_EXIST 0x08 /* file inline data exist flag */
> >>> #define F2FS_INLINE_DOTS 0x10 /* file having implicit dot dentries */
> >>> #define F2FS_EXTRA_ATTR 0x20 /* file having extra attribute */
> >>> +#define F2FS_DONTMOVE 0x40 /* file should not be move */
> >>>
> >>> struct f2fs_inode {
> >>> __le16 i_mode; /* file mode */
> >>>
> >
> > .
> >

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In reply to: Chao Yu: "Re: [f2fs-dev] [PATCH v2] f2fs: add an ioctl to disable GC for specific file"
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