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Message-Id: <1443936993-23831-1-git-send-email-tytso@mit.edu>
Date: Sun, 4 Oct 2015 01:36:31 -0400
From: Theodore Ts'o <tytso@....edu>
To: Ext4 Developers List <linux-ext4@...r.kernel.org>
Cc: Theodore Ts'o <tytso@....edu>
Subject: [PATCH 1/3] ext4: move sysfs code from super.c to fs/ext4/sysfs.c
Also statically allocate the ext4_kset and ext4_feat objects, since we
only need exactly one of each, and it's simpler and less code if we
drop the dynamic allocation and deallocation when it's not needed.
Signed-off-by: Theodore Ts'o <tytso@....edu>
---
fs/ext4/Makefile | 2 +-
fs/ext4/ext4.h | 5 +
fs/ext4/super.c | 426 +++----------------------------------------------------
fs/ext4/sysfs.c | 387 ++++++++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 410 insertions(+), 410 deletions(-)
create mode 100644 fs/ext4/sysfs.c
diff --git a/fs/ext4/Makefile b/fs/ext4/Makefile
index 75285ea..f52cf54 100644
--- a/fs/ext4/Makefile
+++ b/fs/ext4/Makefile
@@ -8,7 +8,7 @@ ext4-y := balloc.o bitmap.o dir.o file.o fsync.o ialloc.o inode.o page-io.o \
ioctl.o namei.o super.o symlink.o hash.o resize.o extents.o \
ext4_jbd2.o migrate.o mballoc.o block_validity.o move_extent.o \
mmp.o indirect.o extents_status.o xattr.o xattr_user.o \
- xattr_trusted.o inline.o readpage.o
+ xattr_trusted.o inline.o readpage.o sysfs.o
ext4-$(CONFIG_EXT4_FS_POSIX_ACL) += acl.o
ext4-$(CONFIG_EXT4_FS_SECURITY) += xattr_security.o
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index fd1f28b..76daccf 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -2903,6 +2903,11 @@ extern const struct inode_operations ext4_encrypted_symlink_inode_operations;
extern const struct inode_operations ext4_symlink_inode_operations;
extern const struct inode_operations ext4_fast_symlink_inode_operations;
+/* sysfs.c */
+extern int ext4_register_sysfs(struct super_block *sb);
+extern int __init ext4_init_sysfs(void);
+extern void ext4_exit_sysfs(void);
+
/* block_validity */
extern void ext4_release_system_zone(struct super_block *sb);
extern int ext4_setup_system_zone(struct super_block *sb);
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index a63c7b0..4a574fb 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -55,10 +55,8 @@
#include <trace/events/ext4.h>
static struct proc_dir_entry *ext4_proc_root;
-static struct kset *ext4_kset;
static struct ext4_lazy_init *ext4_li_info;
static struct mutex ext4_li_mtx;
-static struct ext4_features *ext4_feat;
static int ext4_mballoc_ready;
static struct ratelimit_state ext4_mount_msg_ratelimit;
@@ -83,7 +81,6 @@ static int ext4_feature_set_ok(struct super_block *sb, int readonly);
static void ext4_destroy_lazyinit_thread(void);
static void ext4_unregister_li_request(struct super_block *sb);
static void ext4_clear_request_list(void);
-static int ext4_reserve_clusters(struct ext4_sb_info *, ext4_fsblk_t);
#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
static struct file_system_type ext2_fs_type = {
@@ -2470,335 +2467,6 @@ static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
return ret;
}
-/* sysfs supprt */
-
-struct ext4_attr {
- struct attribute attr;
- ssize_t (*show)(struct ext4_attr *, struct ext4_sb_info *, char *);
- ssize_t (*store)(struct ext4_attr *, struct ext4_sb_info *,
- const char *, size_t);
- union {
- int offset;
- int deprecated_val;
- } u;
-};
-
-static int parse_strtoull(const char *buf,
- unsigned long long max, unsigned long long *value)
-{
- int ret;
-
- ret = kstrtoull(skip_spaces(buf), 0, value);
- if (!ret && *value > max)
- ret = -EINVAL;
- return ret;
-}
-
-static ssize_t delayed_allocation_blocks_show(struct ext4_attr *a,
- struct ext4_sb_info *sbi,
- char *buf)
-{
- return snprintf(buf, PAGE_SIZE, "%llu\n",
- (s64) EXT4_C2B(sbi,
- percpu_counter_sum(&sbi->s_dirtyclusters_counter)));
-}
-
-static ssize_t session_write_kbytes_show(struct ext4_attr *a,
- struct ext4_sb_info *sbi, char *buf)
-{
- struct super_block *sb = sbi->s_buddy_cache->i_sb;
-
- if (!sb->s_bdev->bd_part)
- return snprintf(buf, PAGE_SIZE, "0\n");
- return snprintf(buf, PAGE_SIZE, "%lu\n",
- (part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
- sbi->s_sectors_written_start) >> 1);
-}
-
-static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a,
- struct ext4_sb_info *sbi, char *buf)
-{
- struct super_block *sb = sbi->s_buddy_cache->i_sb;
-
- if (!sb->s_bdev->bd_part)
- return snprintf(buf, PAGE_SIZE, "0\n");
- return snprintf(buf, PAGE_SIZE, "%llu\n",
- (unsigned long long)(sbi->s_kbytes_written +
- ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
- EXT4_SB(sb)->s_sectors_written_start) >> 1)));
-}
-
-static ssize_t inode_readahead_blks_store(struct ext4_attr *a,
- struct ext4_sb_info *sbi,
- const char *buf, size_t count)
-{
- unsigned long t;
- int ret;
-
- ret = kstrtoul(skip_spaces(buf), 0, &t);
- if (ret)
- return ret;
-
- if (t && (!is_power_of_2(t) || t > 0x40000000))
- return -EINVAL;
-
- sbi->s_inode_readahead_blks = t;
- return count;
-}
-
-static ssize_t sbi_ui_show(struct ext4_attr *a,
- struct ext4_sb_info *sbi, char *buf)
-{
- unsigned int *ui = (unsigned int *) (((char *) sbi) + a->u.offset);
-
- return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
-}
-
-static ssize_t sbi_ui_store(struct ext4_attr *a,
- struct ext4_sb_info *sbi,
- const char *buf, size_t count)
-{
- unsigned int *ui = (unsigned int *) (((char *) sbi) + a->u.offset);
- unsigned long t;
- int ret;
-
- ret = kstrtoul(skip_spaces(buf), 0, &t);
- if (ret)
- return ret;
- *ui = t;
- return count;
-}
-
-static ssize_t es_ui_show(struct ext4_attr *a,
- struct ext4_sb_info *sbi, char *buf)
-{
-
- unsigned int *ui = (unsigned int *) (((char *) sbi->s_es) +
- a->u.offset);
-
- return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
-}
-
-static ssize_t reserved_clusters_show(struct ext4_attr *a,
- struct ext4_sb_info *sbi, char *buf)
-{
- return snprintf(buf, PAGE_SIZE, "%llu\n",
- (unsigned long long) atomic64_read(&sbi->s_resv_clusters));
-}
-
-static ssize_t reserved_clusters_store(struct ext4_attr *a,
- struct ext4_sb_info *sbi,
- const char *buf, size_t count)
-{
- unsigned long long val;
- int ret;
-
- if (parse_strtoull(buf, -1ULL, &val))
- return -EINVAL;
- ret = ext4_reserve_clusters(sbi, val);
-
- return ret ? ret : count;
-}
-
-static ssize_t trigger_test_error(struct ext4_attr *a,
- struct ext4_sb_info *sbi,
- const char *buf, size_t count)
-{
- int len = count;
-
- if (!capable(CAP_SYS_ADMIN))
- return -EPERM;
-
- if (len && buf[len-1] == '\n')
- len--;
-
- if (len)
- ext4_error(sbi->s_sb, "%.*s", len, buf);
- return count;
-}
-
-static ssize_t sbi_deprecated_show(struct ext4_attr *a,
- struct ext4_sb_info *sbi, char *buf)
-{
- return snprintf(buf, PAGE_SIZE, "%d\n", a->u.deprecated_val);
-}
-
-#define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
-static struct ext4_attr ext4_attr_##_name = { \
- .attr = {.name = __stringify(_name), .mode = _mode }, \
- .show = _show, \
- .store = _store, \
- .u = { \
- .offset = offsetof(struct ext4_sb_info, _elname),\
- }, \
-}
-
-#define EXT4_ATTR_OFFSET_ES(_name,_mode,_show,_store,_elname) \
-static struct ext4_attr ext4_attr_##_name = { \
- .attr = {.name = __stringify(_name), .mode = _mode }, \
- .show = _show, \
- .store = _store, \
- .u = { \
- .offset = offsetof(struct ext4_super_block, _elname), \
- }, \
-}
-
-#define EXT4_ATTR(name, mode, show, store) \
-static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
-
-#define EXT4_INFO_ATTR(name) EXT4_ATTR(name, 0444, NULL, NULL)
-#define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
-#define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
-
-#define EXT4_RO_ATTR_ES_UI(name, elname) \
- EXT4_ATTR_OFFSET_ES(name, 0444, es_ui_show, NULL, elname)
-#define EXT4_RW_ATTR_SBI_UI(name, elname) \
- EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
-
-#define ATTR_LIST(name) &ext4_attr_##name.attr
-#define EXT4_DEPRECATED_ATTR(_name, _val) \
-static struct ext4_attr ext4_attr_##_name = { \
- .attr = {.name = __stringify(_name), .mode = 0444 }, \
- .show = sbi_deprecated_show, \
- .u = { \
- .deprecated_val = _val, \
- }, \
-}
-
-EXT4_RO_ATTR(delayed_allocation_blocks);
-EXT4_RO_ATTR(session_write_kbytes);
-EXT4_RO_ATTR(lifetime_write_kbytes);
-EXT4_RW_ATTR(reserved_clusters);
-EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, sbi_ui_show,
- inode_readahead_blks_store, s_inode_readahead_blks);
-EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);
-EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);
-EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);
-EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);
-EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);
-EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request);
-EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc);
-EXT4_DEPRECATED_ATTR(max_writeback_mb_bump, 128);
-EXT4_RW_ATTR_SBI_UI(extent_max_zeroout_kb, s_extent_max_zeroout_kb);
-EXT4_ATTR(trigger_fs_error, 0200, NULL, trigger_test_error);
-EXT4_RW_ATTR_SBI_UI(err_ratelimit_interval_ms, s_err_ratelimit_state.interval);
-EXT4_RW_ATTR_SBI_UI(err_ratelimit_burst, s_err_ratelimit_state.burst);
-EXT4_RW_ATTR_SBI_UI(warning_ratelimit_interval_ms, s_warning_ratelimit_state.interval);
-EXT4_RW_ATTR_SBI_UI(warning_ratelimit_burst, s_warning_ratelimit_state.burst);
-EXT4_RW_ATTR_SBI_UI(msg_ratelimit_interval_ms, s_msg_ratelimit_state.interval);
-EXT4_RW_ATTR_SBI_UI(msg_ratelimit_burst, s_msg_ratelimit_state.burst);
-EXT4_RO_ATTR_ES_UI(errors_count, s_error_count);
-EXT4_RO_ATTR_ES_UI(first_error_time, s_first_error_time);
-EXT4_RO_ATTR_ES_UI(last_error_time, s_last_error_time);
-
-static struct attribute *ext4_attrs[] = {
- ATTR_LIST(delayed_allocation_blocks),
- ATTR_LIST(session_write_kbytes),
- ATTR_LIST(lifetime_write_kbytes),
- ATTR_LIST(reserved_clusters),
- ATTR_LIST(inode_readahead_blks),
- ATTR_LIST(inode_goal),
- ATTR_LIST(mb_stats),
- ATTR_LIST(mb_max_to_scan),
- ATTR_LIST(mb_min_to_scan),
- ATTR_LIST(mb_order2_req),
- ATTR_LIST(mb_stream_req),
- ATTR_LIST(mb_group_prealloc),
- ATTR_LIST(max_writeback_mb_bump),
- ATTR_LIST(extent_max_zeroout_kb),
- ATTR_LIST(trigger_fs_error),
- ATTR_LIST(err_ratelimit_interval_ms),
- ATTR_LIST(err_ratelimit_burst),
- ATTR_LIST(warning_ratelimit_interval_ms),
- ATTR_LIST(warning_ratelimit_burst),
- ATTR_LIST(msg_ratelimit_interval_ms),
- ATTR_LIST(msg_ratelimit_burst),
- ATTR_LIST(errors_count),
- ATTR_LIST(first_error_time),
- ATTR_LIST(last_error_time),
- NULL,
-};
-
-/* Features this copy of ext4 supports */
-EXT4_INFO_ATTR(lazy_itable_init);
-EXT4_INFO_ATTR(batched_discard);
-EXT4_INFO_ATTR(meta_bg_resize);
-EXT4_INFO_ATTR(encryption);
-
-static struct attribute *ext4_feat_attrs[] = {
- ATTR_LIST(lazy_itable_init),
- ATTR_LIST(batched_discard),
- ATTR_LIST(meta_bg_resize),
- ATTR_LIST(encryption),
- NULL,
-};
-
-static ssize_t ext4_attr_show(struct kobject *kobj,
- struct attribute *attr, char *buf)
-{
- struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
- s_kobj);
- struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
-
- return a->show ? a->show(a, sbi, buf) : 0;
-}
-
-static ssize_t ext4_attr_store(struct kobject *kobj,
- struct attribute *attr,
- const char *buf, size_t len)
-{
- struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
- s_kobj);
- struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
-
- return a->store ? a->store(a, sbi, buf, len) : 0;
-}
-
-static void ext4_sb_release(struct kobject *kobj)
-{
- struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
- s_kobj);
- complete(&sbi->s_kobj_unregister);
-}
-
-static const struct sysfs_ops ext4_attr_ops = {
- .show = ext4_attr_show,
- .store = ext4_attr_store,
-};
-
-static struct kobj_type ext4_ktype = {
- .default_attrs = ext4_attrs,
- .sysfs_ops = &ext4_attr_ops,
- .release = ext4_sb_release,
-};
-
-static void ext4_feat_release(struct kobject *kobj)
-{
- complete(&ext4_feat->f_kobj_unregister);
-}
-
-static ssize_t ext4_feat_show(struct kobject *kobj,
- struct attribute *attr, char *buf)
-{
- return snprintf(buf, PAGE_SIZE, "supported\n");
-}
-
-/*
- * We can not use ext4_attr_show/store because it relies on the kobject
- * being embedded in the ext4_sb_info structure which is definitely not
- * true in this case.
- */
-static const struct sysfs_ops ext4_feat_ops = {
- .show = ext4_feat_show,
- .store = NULL,
-};
-
-static struct kobj_type ext4_feat_ktype = {
- .default_attrs = ext4_feat_attrs,
- .sysfs_ops = &ext4_feat_ops,
- .release = ext4_feat_release,
-};
-
/*
* Check whether this filesystem can be mounted based on
* the features present and the RDONLY/RDWR mount requested.
@@ -3403,10 +3071,10 @@ int ext4_calculate_overhead(struct super_block *sb)
return 0;
}
-
-static ext4_fsblk_t ext4_calculate_resv_clusters(struct super_block *sb)
+static void ext4_set_resv_clusters(struct super_block *sb)
{
ext4_fsblk_t resv_clusters;
+ struct ext4_sb_info *sbi = EXT4_SB(sb);
/*
* There's no need to reserve anything when we aren't using extents.
@@ -3415,7 +3083,7 @@ static ext4_fsblk_t ext4_calculate_resv_clusters(struct super_block *sb)
* to keep ext2/3 backward compatibility.
*/
if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS))
- return 0;
+ return;
/*
* By default we reserve 2% or 4096 clusters, whichever is smaller.
* This should cover the situations where we can not afford to run
@@ -3424,26 +3092,13 @@ static ext4_fsblk_t ext4_calculate_resv_clusters(struct super_block *sb)
* allocation would require 1, or 2 blocks, higher numbers are
* very rare.
*/
- resv_clusters = ext4_blocks_count(EXT4_SB(sb)->s_es) >>
- EXT4_SB(sb)->s_cluster_bits;
+ resv_clusters = (ext4_blocks_count(sbi->s_es) >>
+ sbi->s_cluster_bits);
do_div(resv_clusters, 50);
resv_clusters = min_t(ext4_fsblk_t, resv_clusters, 4096);
- return resv_clusters;
-}
-
-
-static int ext4_reserve_clusters(struct ext4_sb_info *sbi, ext4_fsblk_t count)
-{
- ext4_fsblk_t clusters = ext4_blocks_count(sbi->s_es) >>
- sbi->s_cluster_bits;
-
- if (count >= clusters)
- return -EINVAL;
-
- atomic64_set(&sbi->s_resv_clusters, count);
- return 0;
+ atomic64_set(&sbi->s_resv_clusters, resv_clusters);
}
static int ext4_fill_super(struct super_block *sb, void *data, int silent)
@@ -4192,12 +3847,7 @@ no_journal:
"available");
}
- err = ext4_reserve_clusters(sbi, ext4_calculate_resv_clusters(sb));
- if (err) {
- ext4_msg(sb, KERN_ERR, "failed to reserve %llu clusters for "
- "reserved pool", ext4_calculate_resv_clusters(sb));
- goto failed_mount4a;
- }
+ ext4_set_resv_clusters(sb);
err = ext4_setup_system_zone(sb);
if (err) {
@@ -4248,10 +3898,7 @@ no_journal:
if (err)
goto failed_mount6;
- sbi->s_kobj.kset = ext4_kset;
- init_completion(&sbi->s_kobj_unregister);
- err = kobject_init_and_add(&sbi->s_kobj, &ext4_ktype, NULL,
- "%s", sb->s_id);
+ err = ext4_register_sysfs(sb);
if (err)
goto failed_mount7;
@@ -5586,37 +5233,6 @@ static struct file_system_type ext4_fs_type = {
};
MODULE_ALIAS_FS("ext4");
-static int __init ext4_init_feat_adverts(void)
-{
- struct ext4_features *ef;
- int ret = -ENOMEM;
-
- ef = kzalloc(sizeof(struct ext4_features), GFP_KERNEL);
- if (!ef)
- goto out;
-
- ef->f_kobj.kset = ext4_kset;
- init_completion(&ef->f_kobj_unregister);
- ret = kobject_init_and_add(&ef->f_kobj, &ext4_feat_ktype, NULL,
- "features");
- if (ret) {
- kfree(ef);
- goto out;
- }
-
- ext4_feat = ef;
- ret = 0;
-out:
- return ret;
-}
-
-static void ext4_exit_feat_adverts(void)
-{
- kobject_put(&ext4_feat->f_kobj);
- wait_for_completion(&ext4_feat->f_kobj_unregister);
- kfree(ext4_feat);
-}
-
/* Shared across all ext4 file systems */
wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ];
@@ -5643,21 +5259,16 @@ static int __init ext4_init_fs(void)
err = ext4_init_pageio();
if (err)
- goto out7;
+ goto out5;
err = ext4_init_system_zone();
if (err)
- goto out6;
- ext4_kset = kset_create_and_add("ext4", NULL, fs_kobj);
- if (!ext4_kset) {
- err = -ENOMEM;
- goto out5;
- }
+ goto out4;
ext4_proc_root = proc_mkdir("fs/ext4", NULL);
- err = ext4_init_feat_adverts();
+ err = ext4_init_sysfs();
if (err)
- goto out4;
+ goto out3;
err = ext4_init_mballoc();
if (err)
@@ -5682,16 +5293,14 @@ out1:
ext4_mballoc_ready = 0;
ext4_exit_mballoc();
out2:
- ext4_exit_feat_adverts();
-out4:
+ ext4_exit_sysfs();
+out3:
if (ext4_proc_root)
remove_proc_entry("fs/ext4", NULL);
- kset_unregister(ext4_kset);
-out5:
ext4_exit_system_zone();
-out6:
+out4:
ext4_exit_pageio();
-out7:
+out5:
ext4_exit_es();
return err;
@@ -5706,9 +5315,8 @@ static void __exit ext4_exit_fs(void)
unregister_filesystem(&ext4_fs_type);
destroy_inodecache();
ext4_exit_mballoc();
- ext4_exit_feat_adverts();
+ ext4_exit_sysfs();
remove_proc_entry("fs/ext4", NULL);
- kset_unregister(ext4_kset);
ext4_exit_system_zone();
ext4_exit_pageio();
ext4_exit_es();
diff --git a/fs/ext4/sysfs.c b/fs/ext4/sysfs.c
new file mode 100644
index 0000000..9fdc21b
--- /dev/null
+++ b/fs/ext4/sysfs.c
@@ -0,0 +1,387 @@
+/*
+ * linux/fs/ext4/sysfs.c
+ *
+ * Copyright (C) 1992, 1993, 1994, 1995
+ * Remy Card (card@...i.ibp.fr)
+ * Theodore Ts'o (tytso@....edu)
+ *
+ */
+
+#include <linux/time.h>
+#include <linux/fs.h>
+#include <linux/seq_file.h>
+#include <linux/proc_fs.h>
+
+#include "ext4.h"
+#include "ext4_jbd2.h"
+
+struct ext4_attr {
+ struct attribute attr;
+ ssize_t (*show)(struct ext4_attr *, struct ext4_sb_info *, char *);
+ ssize_t (*store)(struct ext4_attr *, struct ext4_sb_info *,
+ const char *, size_t);
+ union {
+ int offset;
+ int deprecated_val;
+ } u;
+};
+
+static int parse_strtoull(const char *buf,
+ unsigned long long max, unsigned long long *value)
+{
+ int ret;
+
+ ret = kstrtoull(skip_spaces(buf), 0, value);
+ if (!ret && *value > max)
+ ret = -EINVAL;
+ return ret;
+}
+
+static ssize_t delayed_allocation_blocks_show(struct ext4_attr *a,
+ struct ext4_sb_info *sbi,
+ char *buf)
+{
+ return snprintf(buf, PAGE_SIZE, "%llu\n",
+ (s64) EXT4_C2B(sbi,
+ percpu_counter_sum(&sbi->s_dirtyclusters_counter)));
+}
+
+static ssize_t session_write_kbytes_show(struct ext4_attr *a,
+ struct ext4_sb_info *sbi, char *buf)
+{
+ struct super_block *sb = sbi->s_buddy_cache->i_sb;
+
+ if (!sb->s_bdev->bd_part)
+ return snprintf(buf, PAGE_SIZE, "0\n");
+ return snprintf(buf, PAGE_SIZE, "%lu\n",
+ (part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
+ sbi->s_sectors_written_start) >> 1);
+}
+
+static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a,
+ struct ext4_sb_info *sbi, char *buf)
+{
+ struct super_block *sb = sbi->s_buddy_cache->i_sb;
+
+ if (!sb->s_bdev->bd_part)
+ return snprintf(buf, PAGE_SIZE, "0\n");
+ return snprintf(buf, PAGE_SIZE, "%llu\n",
+ (unsigned long long)(sbi->s_kbytes_written +
+ ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
+ EXT4_SB(sb)->s_sectors_written_start) >> 1)));
+}
+
+static ssize_t inode_readahead_blks_store(struct ext4_attr *a,
+ struct ext4_sb_info *sbi,
+ const char *buf, size_t count)
+{
+ unsigned long t;
+ int ret;
+
+ ret = kstrtoul(skip_spaces(buf), 0, &t);
+ if (ret)
+ return ret;
+
+ if (t && (!is_power_of_2(t) || t > 0x40000000))
+ return -EINVAL;
+
+ sbi->s_inode_readahead_blks = t;
+ return count;
+}
+
+static ssize_t sbi_ui_show(struct ext4_attr *a,
+ struct ext4_sb_info *sbi, char *buf)
+{
+ unsigned int *ui = (unsigned int *) (((char *) sbi) + a->u.offset);
+
+ return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
+}
+
+static ssize_t sbi_ui_store(struct ext4_attr *a,
+ struct ext4_sb_info *sbi,
+ const char *buf, size_t count)
+{
+ unsigned int *ui = (unsigned int *) (((char *) sbi) + a->u.offset);
+ unsigned long t;
+ int ret;
+
+ ret = kstrtoul(skip_spaces(buf), 0, &t);
+ if (ret)
+ return ret;
+ *ui = t;
+ return count;
+}
+
+static ssize_t es_ui_show(struct ext4_attr *a,
+ struct ext4_sb_info *sbi, char *buf)
+{
+
+ unsigned int *ui = (unsigned int *) (((char *) sbi->s_es) +
+ a->u.offset);
+
+ return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
+}
+
+static ssize_t reserved_clusters_show(struct ext4_attr *a,
+ struct ext4_sb_info *sbi, char *buf)
+{
+ return snprintf(buf, PAGE_SIZE, "%llu\n",
+ (unsigned long long) atomic64_read(&sbi->s_resv_clusters));
+}
+
+static ssize_t reserved_clusters_store(struct ext4_attr *a,
+ struct ext4_sb_info *sbi,
+ const char *buf, size_t count)
+{
+ unsigned long long val;
+ ext4_fsblk_t clusters = (ext4_blocks_count(sbi->s_es) >>
+ sbi->s_cluster_bits);
+
+ if (parse_strtoull(buf, -1ULL, &val))
+ return -EINVAL;
+
+ if (val >= clusters)
+ return -EINVAL;
+
+ atomic64_set(&sbi->s_resv_clusters, val);
+ return count;
+}
+
+static ssize_t trigger_test_error(struct ext4_attr *a,
+ struct ext4_sb_info *sbi,
+ const char *buf, size_t count)
+{
+ int len = count;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ if (len && buf[len-1] == '\n')
+ len--;
+
+ if (len)
+ ext4_error(sbi->s_sb, "%.*s", len, buf);
+ return count;
+}
+
+static ssize_t sbi_deprecated_show(struct ext4_attr *a,
+ struct ext4_sb_info *sbi, char *buf)
+{
+ return snprintf(buf, PAGE_SIZE, "%d\n", a->u.deprecated_val);
+}
+
+#define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
+static struct ext4_attr ext4_attr_##_name = { \
+ .attr = {.name = __stringify(_name), .mode = _mode }, \
+ .show = _show, \
+ .store = _store, \
+ .u = { \
+ .offset = offsetof(struct ext4_sb_info, _elname),\
+ }, \
+}
+
+#define EXT4_ATTR_OFFSET_ES(_name,_mode,_show,_store,_elname) \
+static struct ext4_attr ext4_attr_##_name = { \
+ .attr = {.name = __stringify(_name), .mode = _mode }, \
+ .show = _show, \
+ .store = _store, \
+ .u = { \
+ .offset = offsetof(struct ext4_super_block, _elname), \
+ }, \
+}
+
+#define EXT4_ATTR(name, mode, show, store) \
+static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
+
+#define EXT4_INFO_ATTR(name) EXT4_ATTR(name, 0444, NULL, NULL)
+#define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
+#define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
+
+#define EXT4_RO_ATTR_ES_UI(name, elname) \
+ EXT4_ATTR_OFFSET_ES(name, 0444, es_ui_show, NULL, elname)
+#define EXT4_RW_ATTR_SBI_UI(name, elname) \
+ EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
+
+#define ATTR_LIST(name) &ext4_attr_##name.attr
+#define EXT4_DEPRECATED_ATTR(_name, _val) \
+static struct ext4_attr ext4_attr_##_name = { \
+ .attr = {.name = __stringify(_name), .mode = 0444 }, \
+ .show = sbi_deprecated_show, \
+ .u = { \
+ .deprecated_val = _val, \
+ }, \
+}
+
+EXT4_RO_ATTR(delayed_allocation_blocks);
+EXT4_RO_ATTR(session_write_kbytes);
+EXT4_RO_ATTR(lifetime_write_kbytes);
+EXT4_RW_ATTR(reserved_clusters);
+EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, sbi_ui_show,
+ inode_readahead_blks_store, s_inode_readahead_blks);
+EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);
+EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);
+EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);
+EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);
+EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);
+EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request);
+EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc);
+EXT4_DEPRECATED_ATTR(max_writeback_mb_bump, 128);
+EXT4_RW_ATTR_SBI_UI(extent_max_zeroout_kb, s_extent_max_zeroout_kb);
+EXT4_ATTR(trigger_fs_error, 0200, NULL, trigger_test_error);
+EXT4_RW_ATTR_SBI_UI(err_ratelimit_interval_ms, s_err_ratelimit_state.interval);
+EXT4_RW_ATTR_SBI_UI(err_ratelimit_burst, s_err_ratelimit_state.burst);
+EXT4_RW_ATTR_SBI_UI(warning_ratelimit_interval_ms, s_warning_ratelimit_state.interval);
+EXT4_RW_ATTR_SBI_UI(warning_ratelimit_burst, s_warning_ratelimit_state.burst);
+EXT4_RW_ATTR_SBI_UI(msg_ratelimit_interval_ms, s_msg_ratelimit_state.interval);
+EXT4_RW_ATTR_SBI_UI(msg_ratelimit_burst, s_msg_ratelimit_state.burst);
+EXT4_RO_ATTR_ES_UI(errors_count, s_error_count);
+EXT4_RO_ATTR_ES_UI(first_error_time, s_first_error_time);
+EXT4_RO_ATTR_ES_UI(last_error_time, s_last_error_time);
+
+static struct attribute *ext4_attrs[] = {
+ ATTR_LIST(delayed_allocation_blocks),
+ ATTR_LIST(session_write_kbytes),
+ ATTR_LIST(lifetime_write_kbytes),
+ ATTR_LIST(reserved_clusters),
+ ATTR_LIST(inode_readahead_blks),
+ ATTR_LIST(inode_goal),
+ ATTR_LIST(mb_stats),
+ ATTR_LIST(mb_max_to_scan),
+ ATTR_LIST(mb_min_to_scan),
+ ATTR_LIST(mb_order2_req),
+ ATTR_LIST(mb_stream_req),
+ ATTR_LIST(mb_group_prealloc),
+ ATTR_LIST(max_writeback_mb_bump),
+ ATTR_LIST(extent_max_zeroout_kb),
+ ATTR_LIST(trigger_fs_error),
+ ATTR_LIST(err_ratelimit_interval_ms),
+ ATTR_LIST(err_ratelimit_burst),
+ ATTR_LIST(warning_ratelimit_interval_ms),
+ ATTR_LIST(warning_ratelimit_burst),
+ ATTR_LIST(msg_ratelimit_interval_ms),
+ ATTR_LIST(msg_ratelimit_burst),
+ ATTR_LIST(errors_count),
+ ATTR_LIST(first_error_time),
+ ATTR_LIST(last_error_time),
+ NULL,
+};
+
+/* Features this copy of ext4 supports */
+EXT4_INFO_ATTR(lazy_itable_init);
+EXT4_INFO_ATTR(batched_discard);
+EXT4_INFO_ATTR(meta_bg_resize);
+EXT4_INFO_ATTR(encryption);
+
+static struct attribute *ext4_feat_attrs[] = {
+ ATTR_LIST(lazy_itable_init),
+ ATTR_LIST(batched_discard),
+ ATTR_LIST(meta_bg_resize),
+ ATTR_LIST(encryption),
+ NULL,
+};
+
+static ssize_t ext4_attr_show(struct kobject *kobj,
+ struct attribute *attr, char *buf)
+{
+ struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
+ s_kobj);
+ struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
+
+ return a->show ? a->show(a, sbi, buf) : 0;
+}
+
+static ssize_t ext4_attr_store(struct kobject *kobj,
+ struct attribute *attr,
+ const char *buf, size_t len)
+{
+ struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
+ s_kobj);
+ struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
+
+ return a->store ? a->store(a, sbi, buf, len) : 0;
+}
+
+static void ext4_sb_release(struct kobject *kobj)
+{
+ struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
+ s_kobj);
+ complete(&sbi->s_kobj_unregister);
+}
+
+static const struct sysfs_ops ext4_attr_ops = {
+ .show = ext4_attr_show,
+ .store = ext4_attr_store,
+};
+
+static struct kobj_type ext4_sb_ktype = {
+ .default_attrs = ext4_attrs,
+ .sysfs_ops = &ext4_attr_ops,
+ .release = ext4_sb_release,
+};
+
+static struct kobj_type ext4_ktype = {
+ .sysfs_ops = &ext4_attr_ops,
+};
+
+static struct kset ext4_kset = {
+ .kobj = {.ktype = &ext4_ktype},
+};
+
+static ssize_t ext4_feat_show(struct kobject *kobj,
+ struct attribute *attr, char *buf)
+{
+ return snprintf(buf, PAGE_SIZE, "supported\n");
+}
+
+/*
+ * We can not use ext4_attr_show/store because it relies on the kobject
+ * being embedded in the ext4_sb_info structure which is definitely not
+ * true in this case.
+ */
+static const struct sysfs_ops ext4_feat_ops = {
+ .show = ext4_feat_show,
+ .store = NULL,
+};
+
+static struct kobj_type ext4_feat_ktype = {
+ .default_attrs = ext4_feat_attrs,
+ .sysfs_ops = &ext4_feat_ops,
+};
+
+static struct kobject ext4_feat = {
+ .kset = &ext4_kset,
+};
+
+int ext4_register_sysfs(struct super_block *sb)
+{
+ struct ext4_sb_info *sbi = EXT4_SB(sb);
+
+ sbi->s_kobj.kset = &ext4_kset;
+ init_completion(&sbi->s_kobj_unregister);
+ return kobject_init_and_add(&sbi->s_kobj, &ext4_sb_ktype, NULL,
+ "%s", sb->s_id);
+}
+
+int __init ext4_init_sysfs(void)
+{
+ int ret;
+
+ kobject_set_name(&ext4_kset.kobj, "ext4");
+ ext4_kset.kobj.parent = fs_kobj;
+ ret = kset_register(&ext4_kset);
+ if (ret)
+ return ret;
+
+ ret = kobject_init_and_add(&ext4_feat, &ext4_feat_ktype,
+ NULL, "features");
+ if (ret)
+ kset_unregister(&ext4_kset);
+ return ret;
+}
+
+void ext4_exit_sysfs(void)
+{
+ kobject_put(&ext4_feat);
+ kset_unregister(&ext4_kset);
+}
+
--
2.5.0
--
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