From bf9e697ecd4214c86ff35764449348db45c697b1 Mon Sep 17 00:00:00 2001 From: Jaegeuk Kim Date: Fri, 21 Jul 2017 17:14:09 -0700 Subject: [PATCH] f2fs: expose features to sysfs entry This patch exposes what features are supported by current f2fs build to sysfs entry via: /sys/fs/f2fs/features/ /sys/fs/f2fs/dev/features Reviewed-by: Chao Yu Signed-off-by: Jaegeuk Kim --- fs/f2fs/sysfs.c | 156 ++++++++++++++++++++++++++++++++++++++++-------- 1 file changed, 130 insertions(+), 26 deletions(-) diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c index 5a78b9af92ef..1e31d0c5b6ab 100644 --- a/fs/f2fs/sysfs.c +++ b/fs/f2fs/sysfs.c @@ -18,7 +18,6 @@ #include "gc.h" static struct proc_dir_entry *f2fs_proc_root; -static struct kset *f2fs_kset; /* Sysfs support for f2fs */ enum { @@ -41,6 +40,7 @@ struct f2fs_attr { const char *, size_t); int struct_type; int offset; + int id; }; static unsigned char *__struct_ptr(struct f2fs_sb_info *sbi, int struct_type) @@ -76,6 +76,34 @@ static ssize_t lifetime_write_kbytes_show(struct f2fs_attr *a, BD_PART_WRITTEN(sbi))); } +static ssize_t features_show(struct f2fs_attr *a, + struct f2fs_sb_info *sbi, char *buf) +{ + struct super_block *sb = sbi->sb; + int len = 0; + + if (!sb->s_bdev->bd_part) + return snprintf(buf, PAGE_SIZE, "0\n"); + + if (f2fs_sb_has_crypto(sb)) + len += snprintf(buf, PAGE_SIZE - len, "%s", + "encryption"); + if (f2fs_sb_mounted_blkzoned(sb)) + len += snprintf(buf + len, PAGE_SIZE - len, "%s%s", + len ? ", " : "", "blkzoned"); + if (f2fs_sb_has_extra_attr(sb)) + len += snprintf(buf + len, PAGE_SIZE - len, "%s%s", + len ? ", " : "", "extra_attr"); + if (f2fs_sb_has_project_quota(sb)) + len += snprintf(buf + len, PAGE_SIZE - len, "%s%s", + len ? ", " : "", "projquota"); + if (f2fs_sb_has_inode_chksum(sb)) + len += snprintf(buf + len, PAGE_SIZE - len, "%s%s", + len ? ", " : "", "inode_checksum"); + len += snprintf(buf + len, PAGE_SIZE - len, "\n"); + return len; +} + static ssize_t f2fs_sbi_show(struct f2fs_attr *a, struct f2fs_sb_info *sbi, char *buf) { @@ -155,6 +183,30 @@ static void f2fs_sb_release(struct kobject *kobj) complete(&sbi->s_kobj_unregister); } +enum feat_id { + FEAT_CRYPTO = 0, + FEAT_BLKZONED, + FEAT_ATOMIC_WRITE, + FEAT_EXTRA_ATTR, + FEAT_PROJECT_QUOTA, + FEAT_INODE_CHECKSUM, +}; + +static ssize_t f2fs_feature_show(struct f2fs_attr *a, + struct f2fs_sb_info *sbi, char *buf) +{ + switch (a->id) { + case FEAT_CRYPTO: + case FEAT_BLKZONED: + case FEAT_ATOMIC_WRITE: + case FEAT_EXTRA_ATTR: + case FEAT_PROJECT_QUOTA: + case FEAT_INODE_CHECKSUM: + return snprintf(buf, PAGE_SIZE, "supported\n"); + } + return 0; +} + #define F2FS_ATTR_OFFSET(_struct_type, _name, _mode, _show, _store, _offset) \ static struct f2fs_attr f2fs_attr_##_name = { \ .attr = {.name = __stringify(_name), .mode = _mode }, \ @@ -172,6 +224,13 @@ static struct f2fs_attr f2fs_attr_##_name = { \ #define F2FS_GENERAL_RO_ATTR(name) \ static struct f2fs_attr f2fs_attr_##name = __ATTR(name, 0444, name##_show, NULL) +#define F2FS_FEATURE_RO_ATTR(_name, _id) \ +static struct f2fs_attr f2fs_attr_##_name = { \ + .attr = {.name = __stringify(_name), .mode = 0444 }, \ + .show = f2fs_feature_show, \ + .id = _id, \ +} + F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_min_sleep_time, min_sleep_time); F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_max_sleep_time, max_sleep_time); F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_no_gc_sleep_time, no_gc_sleep_time); @@ -196,6 +255,18 @@ 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); #endif F2FS_GENERAL_RO_ATTR(lifetime_write_kbytes); +F2FS_GENERAL_RO_ATTR(features); + +#ifdef CONFIG_F2FS_FS_ENCRYPTION +F2FS_FEATURE_RO_ATTR(encryption, FEAT_CRYPTO); +#endif +#ifdef CONFIG_BLK_DEV_ZONED +F2FS_FEATURE_RO_ATTR(block_zoned, FEAT_BLKZONED); +#endif +F2FS_FEATURE_RO_ATTR(atomic_write, FEAT_ATOMIC_WRITE); +F2FS_FEATURE_RO_ATTR(extra_attr, FEAT_EXTRA_ATTR); +F2FS_FEATURE_RO_ATTR(project_quota, FEAT_PROJECT_QUOTA); +F2FS_FEATURE_RO_ATTR(inode_checksum, FEAT_INODE_CHECKSUM); #define ATTR_LIST(name) (&f2fs_attr_##name.attr) static struct attribute *f2fs_attrs[] = { @@ -222,21 +293,53 @@ static struct attribute *f2fs_attrs[] = { ATTR_LIST(inject_type), #endif ATTR_LIST(lifetime_write_kbytes), + ATTR_LIST(features), ATTR_LIST(reserved_blocks), NULL, }; +static struct attribute *f2fs_feat_attrs[] = { +#ifdef CONFIG_F2FS_FS_ENCRYPTION + ATTR_LIST(encryption), +#endif +#ifdef CONFIG_BLK_DEV_ZONED + ATTR_LIST(block_zoned), +#endif + ATTR_LIST(atomic_write), + ATTR_LIST(extra_attr), + ATTR_LIST(project_quota), + ATTR_LIST(inode_checksum), + NULL, +}; + static const struct sysfs_ops f2fs_attr_ops = { .show = f2fs_attr_show, .store = f2fs_attr_store, }; -static struct kobj_type f2fs_ktype = { +static struct kobj_type f2fs_sb_ktype = { .default_attrs = f2fs_attrs, .sysfs_ops = &f2fs_attr_ops, .release = f2fs_sb_release, }; +static struct kobj_type f2fs_ktype = { + .sysfs_ops = &f2fs_attr_ops, +}; + +static struct kset f2fs_kset = { + .kobj = {.ktype = &f2fs_ktype}, +}; + +static struct kobj_type f2fs_feat_ktype = { + .default_attrs = f2fs_feat_attrs, + .sysfs_ops = &f2fs_attr_ops, +}; + +static struct kobject f2fs_feat = { + .kset = &f2fs_kset, +}; + static int segment_info_seq_show(struct seq_file *seq, void *offset) { struct super_block *sb = seq->private; @@ -306,18 +409,29 @@ F2FS_PROC_FILE_DEF(segment_bits); int __init f2fs_init_sysfs(void) { - f2fs_proc_root = proc_mkdir("fs/f2fs", NULL); + int ret; - f2fs_kset = kset_create_and_add("f2fs", NULL, fs_kobj); - if (!f2fs_kset) - return -ENOMEM; - return 0; + kobject_set_name(&f2fs_kset.kobj, "f2fs"); + f2fs_kset.kobj.parent = fs_kobj; + ret = kset_register(&f2fs_kset); + if (ret) + return ret; + + ret = kobject_init_and_add(&f2fs_feat, &f2fs_feat_ktype, + NULL, "features"); + if (ret) + kset_unregister(&f2fs_kset); + else + f2fs_proc_root = proc_mkdir("fs/f2fs", NULL); + return ret; } void f2fs_exit_sysfs(void) { - kset_unregister(f2fs_kset); + kobject_put(&f2fs_feat); + kset_unregister(&f2fs_kset); remove_proc_entry("fs/f2fs", NULL); + f2fs_proc_root = NULL; } int f2fs_register_sysfs(struct f2fs_sb_info *sbi) @@ -325,6 +439,13 @@ int f2fs_register_sysfs(struct f2fs_sb_info *sbi) struct super_block *sb = sbi->sb; int err; + sbi->s_kobj.kset = &f2fs_kset; + init_completion(&sbi->s_kobj_unregister); + err = kobject_init_and_add(&sbi->s_kobj, &f2fs_sb_ktype, NULL, + "%s", sb->s_id); + if (err) + return err; + if (f2fs_proc_root) sbi->s_proc = proc_mkdir(sb->s_id, f2fs_proc_root); @@ -334,32 +455,15 @@ int f2fs_register_sysfs(struct f2fs_sb_info *sbi) proc_create_data("segment_bits", S_IRUGO, sbi->s_proc, &f2fs_seq_segment_bits_fops, sb); } - - sbi->s_kobj.kset = f2fs_kset; - init_completion(&sbi->s_kobj_unregister); - err = kobject_init_and_add(&sbi->s_kobj, &f2fs_ktype, NULL, - "%s", sb->s_id); - if (err) - goto err_out; return 0; -err_out: - if (sbi->s_proc) { - remove_proc_entry("segment_info", sbi->s_proc); - remove_proc_entry("segment_bits", sbi->s_proc); - remove_proc_entry(sb->s_id, f2fs_proc_root); - } - return err; } void f2fs_unregister_sysfs(struct f2fs_sb_info *sbi) { - kobject_del(&sbi->s_kobj); - kobject_put(&sbi->s_kobj); - wait_for_completion(&sbi->s_kobj_unregister); - if (sbi->s_proc) { remove_proc_entry("segment_info", sbi->s_proc); remove_proc_entry("segment_bits", sbi->s_proc); remove_proc_entry(sbi->sb->s_id, f2fs_proc_root); } + kobject_del(&sbi->s_kobj); }