From 0cdd31953967b25c216ddcb630ec9a6bb8a91371 Mon Sep 17 00:00:00 2001 From: Hyunchul Lee Date: Wed, 31 Jan 2018 11:36:57 +0900 Subject: f2fs: support passing down write hints given by users to block layer Add the 'whint_mode' mount option that controls which write hints are passed down to block layer. There are "off" and "user-based" mode. The default mode is "off". 1) whint_mode=off. F2FS only passes down WRITE_LIFE_NOT_SET. 2) whint_mode=user-based. F2FS tries to pass down hints given by users. User F2FS Block ---- ---- ----- META WRITE_LIFE_NOT_SET HOT_NODE " WARM_NODE " COLD_NODE " ioctl(COLD) COLD_DATA WRITE_LIFE_EXTREME extension list " " -- buffered io WRITE_LIFE_EXTREME COLD_DATA WRITE_LIFE_EXTREME WRITE_LIFE_SHORT HOT_DATA WRITE_LIFE_SHORT WRITE_LIFE_NOT_SET WARM_DATA WRITE_LIFE_NOT_SET WRITE_LIFE_NONE " " WRITE_LIFE_MEDIUM " " WRITE_LIFE_LONG " " -- direct io WRITE_LIFE_EXTREME COLD_DATA WRITE_LIFE_EXTREME WRITE_LIFE_SHORT HOT_DATA WRITE_LIFE_SHORT WRITE_LIFE_NOT_SET WARM_DATA WRITE_LIFE_NOT_SET WRITE_LIFE_NONE " WRITE_LIFE_NONE WRITE_LIFE_MEDIUM " WRITE_LIFE_MEDIUM WRITE_LIFE_LONG " WRITE_LIFE_LONG Many thanks to Chao Yu and Jaegeuk Kim for comments to implement this patch. Signed-off-by: Hyunchul Lee Reviewed-by: Chao Yu [Jaegeuk Kim: avoid build warning] [Chao Yu: fix to restore whint_mode in ->remount_fs] Signed-off-by: Jaegeuk Kim --- fs/f2fs/super.c | 31 ++++++++++++++++++++++++++++++- 1 file changed, 30 insertions(+), 1 deletion(-) (limited to 'fs/f2fs/super.c') diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c index 9587ca0bcd3e..28b9d605d20f 100644 --- a/fs/f2fs/super.c +++ b/fs/f2fs/super.c @@ -129,6 +129,7 @@ enum { Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, + Opt_whint, Opt_err, }; @@ -182,6 +183,7 @@ static match_table_t f2fs_tokens = { {Opt_jqfmt_vfsold, "jqfmt=vfsold"}, {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"}, {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"}, + {Opt_whint, "whint_mode=%s"}, {Opt_err, NULL}, }; @@ -679,6 +681,22 @@ static int parse_options(struct super_block *sb, char *options) "quota operations not supported"); break; #endif + case Opt_whint: + name = match_strdup(&args[0]); + if (!name) + return -ENOMEM; + if (strlen(name) == 10 && + !strncmp(name, "user-based", 10)) { + sbi->whint_mode = WHINT_MODE_USER; + } else if (strlen(name) == 3 && + !strncmp(name, "off", 3)) { + sbi->whint_mode = WHINT_MODE_OFF; + } else { + kfree(name); + return -EINVAL; + } + kfree(name); + break; default: f2fs_msg(sb, KERN_ERR, "Unrecognized mount option \"%s\" or missing value", @@ -722,6 +740,12 @@ static int parse_options(struct super_block *sb, char *options) return -EINVAL; } } + + /* Not pass down write hints if the number of active logs is lesser + * than NR_CURSEG_TYPE. + */ + if (sbi->active_logs != NR_CURSEG_TYPE) + sbi->whint_mode = WHINT_MODE_OFF; return 0; } @@ -1232,6 +1256,8 @@ static int f2fs_show_options(struct seq_file *seq, struct dentry *root) seq_puts(seq, ",prjquota"); #endif f2fs_show_quota_options(seq, sbi->sb); + if (sbi->whint_mode == WHINT_MODE_USER) + seq_printf(seq, ",whint_mode=%s", "user-based"); return 0; } @@ -1241,6 +1267,7 @@ static void default_options(struct f2fs_sb_info *sbi) /* init some FS parameters */ sbi->active_logs = NR_CURSEG_TYPE; sbi->inline_xattr_size = DEFAULT_INLINE_XATTR_ADDRS; + sbi->whint_mode = WHINT_MODE_OFF; set_opt(sbi, BG_GC); set_opt(sbi, INLINE_XATTR); @@ -1281,6 +1308,7 @@ static int f2fs_remount(struct super_block *sb, int *flags, char *data) bool need_restart_gc = false; bool need_stop_gc = false; bool no_extent_cache = !test_opt(sbi, EXTENT_CACHE); + int old_whint_mode = sbi->whint_mode; #ifdef CONFIG_F2FS_FAULT_INJECTION struct f2fs_fault_info ffi = sbi->fault_info; #endif @@ -1380,7 +1408,7 @@ static int f2fs_remount(struct super_block *sb, int *flags, char *data) need_stop_gc = true; } - if (*flags & SB_RDONLY) { + if (*flags & SB_RDONLY || sbi->whint_mode != old_whint_mode) { writeback_inodes_sb(sb, WB_REASON_SYNC); sync_inodes_sb(sb); @@ -1430,6 +1458,7 @@ restore_opts: sbi->s_qf_names[i] = s_qf_names[i]; } #endif + sbi->whint_mode = old_whint_mode; sbi->mount_opt = org_mount_opt; sbi->active_logs = active_logs; sb->s_flags = old_sb_flags; -- cgit v1.2.3