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Date: Wed, 27 Dec 2017 19:40:20 -0800 From: Jaegeuk Kim <jaegeuk@...nel.org> To: linux-kernel@...r.kernel.org, linux-f2fs-devel@...ts.sourceforge.net Subject: Re: [PATCH v2] 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. It also conducts in-place-update for dontmove file. Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org> --- Change log from v2: - change the naming from dontmove to pin_file - do in-place-update for pinned files - use union for i_current_depth with i_gc_failures - pass increasing i_gc_failures fs/f2fs/data.c | 2 ++ fs/f2fs/f2fs.h | 29 +++++++++++++++++++++++++- 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 | 9 ++++++++- 7 files changed, 107 insertions(+), 2 deletions(-) diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c index 7aca6ccd01f6..b9fab6186f28 100644 --- a/fs/f2fs/data.c +++ b/fs/f2fs/data.c @@ -1394,6 +1394,8 @@ static inline bool need_inplace_update(struct f2fs_io_info *fio) { struct inode *inode = fio->page->mapping->host; + if (f2fs_is_pinned_file(inode)) + return true; if (S_ISDIR(inode->i_mode) || f2fs_is_atomic_file(inode)) return false; if (is_cold_data(fio->page)) diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h index 65a51b941146..398ed95d4036 100644 --- a/fs/f2fs/f2fs.h +++ b/fs/f2fs/f2fs.h @@ -376,6 +376,8 @@ 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_PIN_FILE _IO(F2FS_IOCTL_MAGIC, 13) + struct f2fs_gc_range { u32 sync; u64 start; @@ -586,7 +588,10 @@ struct f2fs_inode_info { unsigned long i_flags; /* keep an inode flags for ioctl */ unsigned char i_advise; /* use to give file attribute hints */ unsigned char i_dir_level; /* use for dentry level for large dir */ - unsigned int i_current_depth; /* use only in directory structure */ + union { + unsigned int i_current_depth; /* only for directory depth */ + unsigned short i_gc_failures; /* only for regular file */ + }; unsigned int i_pino; /* parent inode number */ umode_t i_acl_mode; /* keep file acl mode temporarily */ @@ -1130,6 +1135,9 @@ struct f2fs_sb_info { /* threshold for converting bg victims for fg */ u64 fggc_threshold; + /* threshold for gc trials on pinned files */ + u64 gc_pin_file_threshold; + /* maximum # of trials to find a victim segment for SSR and GC */ unsigned int max_victim_search; @@ -2119,6 +2127,7 @@ enum { FI_HOT_DATA, /* indicate file is hot */ FI_EXTRA_ATTR, /* indicate file has extra attribute */ FI_PROJ_INHERIT, /* indicate file inherits projectid */ + FI_PIN_FILE, /* indicate file should not be gced */ }; static inline void __mark_inode_dirty_flag(struct inode *inode, @@ -2132,6 +2141,7 @@ static inline void __mark_inode_dirty_flag(struct inode *inode, return; case FI_DATA_EXIST: case FI_INLINE_DOTS: + case FI_PIN_FILE: f2fs_mark_inode_dirty_sync(inode, true); } } @@ -2212,6 +2222,13 @@ static inline void f2fs_i_depth_write(struct inode *inode, unsigned int depth) f2fs_mark_inode_dirty_sync(inode, true); } +static inline void f2fs_i_gc_failures_write(struct inode *inode, + unsigned int count) +{ + F2FS_I(inode)->i_gc_failures = count; + f2fs_mark_inode_dirty_sync(inode, true); +} + static inline void f2fs_i_xnid_write(struct inode *inode, nid_t xnid) { F2FS_I(inode)->i_xattr_nid = xnid; @@ -2240,6 +2257,8 @@ 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_PIN_FILE) + set_bit(FI_PIN_FILE, &fi->flags); } static inline void set_raw_inline(struct inode *inode, struct f2fs_inode *ri) @@ -2258,6 +2277,8 @@ 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_PIN_FILE)) + ri->i_inline |= F2FS_PIN_FILE; } static inline int f2fs_has_extra_attr(struct inode *inode) @@ -2303,6 +2324,11 @@ static inline int f2fs_has_inline_dots(struct inode *inode) return is_inode_flag_set(inode, FI_INLINE_DOTS); } +static inline bool f2fs_is_pinned_file(struct inode *inode) +{ + return is_inode_flag_set(inode, FI_PIN_FILE); +} + static inline bool f2fs_is_atomic_file(struct inode *inode) { return is_inode_flag_set(inode, FI_ATOMIC_FILE); @@ -2518,6 +2544,7 @@ 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_pin_file_control(struct inode *inode, bool inc); /* * inode.c diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c index 1db68f1bcd77..5a3b9a07d72d 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_pin_file_control(struct inode *inode, bool inc) +{ + struct f2fs_inode_info *fi = F2FS_I(inode); + struct f2fs_sb_info *sbi = F2FS_I_SB(inode); + + /* Use i_gc_failures for normal file as a risk signal. */ + if (inc) + f2fs_i_gc_failures_write(inode, fi->i_gc_failures + 1); + + if (fi->i_gc_failures > sbi->gc_pin_file_threshold) { + f2fs_msg(sbi->sb, KERN_WARNING, + "%s: Enable GC = ino %lx after %x GC trials\n", + __func__, inode->i_ino, fi->i_gc_failures); + return -EAGAIN; + } + return 0; +} + +static int f2fs_ioc_pin_file(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_pin_file_control(inode, false)) { + ret = -EAGAIN; + goto out; + } + + ret = f2fs_convert_inline_inode(inode); + if (ret) + goto out; + + set_inode_flag(inode, FI_PIN_FILE); + ret = F2FS_I(inode)->i_gc_failures; + 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_PIN_FILE: + return f2fs_ioc_pin_file(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_PIN_FILE: break; default: return -ENOIOCTLCMD; diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c index 5d5bba462f26..9bffef153a12 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_pinned_file(inode)) { + f2fs_pin_file_control(inode, true); + 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_pinned_file(inode)) { + if (gc_type == FG_GC) + f2fs_pin_file_control(inode, true); + 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_pin_file_threshold = DEF_GC_FAILED_PINNED_FILES; /* 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..33310165cb78 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_PINNED_FILES 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 581c7ce23c22..0e3253d7cb10 100644 --- a/fs/f2fs/sysfs.c +++ b/fs/f2fs/sysfs.c @@ -303,6 +303,7 @@ 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_pin_file_thresh, gc_pin_file_threshold); #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); @@ -351,6 +352,7 @@ static struct attribute *f2fs_attrs[] = { ATTR_LIST(idle_interval), ATTR_LIST(iostat_enable), ATTR_LIST(readdir_ra), + ATTR_LIST(gc_pin_file_thresh), #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..cfb522e6affc 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_PIN_FILE 0x40 /* file should not be gced */ struct f2fs_inode { __le16 i_mode; /* file mode */ @@ -229,7 +230,13 @@ struct f2fs_inode { __le32 i_ctime_nsec; /* change time in nano scale */ __le32 i_mtime_nsec; /* modification time in nano scale */ __le32 i_generation; /* file version (for NFS) */ - __le32 i_current_depth; /* only for directory depth */ + union { + __le32 i_current_depth; /* only for directory depth */ + __le16 i_gc_failures; /* + * # of gc failures on pinned file. + * only for regular files. + */ + }; __le32 i_xattr_nid; /* nid to save xattr */ __le32 i_flags; /* file attributes */ __le32 i_pino; /* parent inode number */ -- 2.15.0.531.g2ccb3012c9-goog
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