forked from luck/tmp_suning_uos_patched
ext4: refactor sysfs support code
Make the code more easily extensible as well as taking up less compiled space. Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Theodore Ts'o
parent
b579901882
commit
76d33bca55
267
fs/ext4/sysfs.c
267
fs/ext4/sysfs.c
|
|
@ -15,37 +15,35 @@
|
|||
#include "ext4.h"
|
||||
#include "ext4_jbd2.h"
|
||||
|
||||
typedef enum {
|
||||
attr_noop,
|
||||
attr_delayed_allocation_blocks,
|
||||
attr_session_write_kbytes,
|
||||
attr_lifetime_write_kbytes,
|
||||
attr_reserved_clusters,
|
||||
attr_inode_readahead,
|
||||
attr_trigger_test_error,
|
||||
attr_feature,
|
||||
attr_pointer_ui,
|
||||
attr_pointer_atomic,
|
||||
} attr_id_t;
|
||||
|
||||
typedef enum {
|
||||
ptr_explicit,
|
||||
ptr_ext4_sb_info_offset,
|
||||
ptr_ext4_super_block_offset,
|
||||
} attr_ptr_t;
|
||||
|
||||
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);
|
||||
short attr_id;
|
||||
short attr_ptr;
|
||||
union {
|
||||
int offset;
|
||||
int deprecated_val;
|
||||
void *explicit_ptr;
|
||||
} 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)
|
||||
{
|
||||
|
|
@ -89,46 +87,6 @@ static ssize_t inode_readahead_blks_store(struct ext4_attr *a,
|
|||
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)
|
||||
|
|
@ -136,11 +94,10 @@ static ssize_t reserved_clusters_store(struct ext4_attr *a,
|
|||
unsigned long long val;
|
||||
ext4_fsblk_t clusters = (ext4_blocks_count(sbi->s_es) >>
|
||||
sbi->s_cluster_bits);
|
||||
int ret;
|
||||
|
||||
if (parse_strtoull(buf, -1ULL, &val))
|
||||
return -EINVAL;
|
||||
|
||||
if (val >= clusters)
|
||||
ret = kstrtoull(skip_spaces(buf), 0, &val);
|
||||
if (!ret || val >= clusters)
|
||||
return -EINVAL;
|
||||
|
||||
atomic64_set(&sbi->s_resv_clusters, val);
|
||||
|
|
@ -164,60 +121,51 @@ static ssize_t trigger_test_error(struct ext4_attr *a,
|
|||
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) \
|
||||
#define EXT4_ATTR(_name,_mode,_id) \
|
||||
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), \
|
||||
}, \
|
||||
.attr_id = attr_##_id, \
|
||||
}
|
||||
|
||||
#define EXT4_ATTR(name, mode, show, store) \
|
||||
static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
|
||||
#define EXT4_ATTR_FUNC(_name,_mode) EXT4_ATTR(_name,_mode,_name)
|
||||
|
||||
#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_ATTR_FEATURE(_name) EXT4_ATTR(_name, 0444, feature)
|
||||
|
||||
#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) \
|
||||
#define EXT4_ATTR_OFFSET(_name,_mode,_id,_struct,_elname) \
|
||||
static struct ext4_attr ext4_attr_##_name = { \
|
||||
.attr = {.name = __stringify(_name), .mode = 0444 }, \
|
||||
.show = sbi_deprecated_show, \
|
||||
.attr = {.name = __stringify(_name), .mode = _mode }, \
|
||||
.attr_id = attr_##_id, \
|
||||
.attr_ptr = ptr_##_struct##_offset, \
|
||||
.u = { \
|
||||
.deprecated_val = _val, \
|
||||
.offset = offsetof(struct _struct, _elname),\
|
||||
}, \
|
||||
}
|
||||
|
||||
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);
|
||||
#define EXT4_RO_ATTR_ES_UI(_name,_elname) \
|
||||
EXT4_ATTR_OFFSET(_name, 0444, pointer_ui, ext4_super_block, _elname)
|
||||
|
||||
#define EXT4_RW_ATTR_SBI_UI(_name,_elname) \
|
||||
EXT4_ATTR_OFFSET(_name, 0644, pointer_ui, ext4_sb_info, _elname)
|
||||
|
||||
#define EXT4_ATTR_PTR(_name,_mode,_id,_ptr) \
|
||||
static struct ext4_attr ext4_attr_##_name = { \
|
||||
.attr = {.name = __stringify(_name), .mode = _mode }, \
|
||||
.attr_id = attr_##_id, \
|
||||
.attr_ptr = ptr_explicit, \
|
||||
.u = { \
|
||||
.explicit_ptr = _ptr, \
|
||||
}, \
|
||||
}
|
||||
|
||||
#define ATTR_LIST(name) &ext4_attr_##name.attr
|
||||
|
||||
EXT4_ATTR_FUNC(delayed_allocation_blocks, 0444);
|
||||
EXT4_ATTR_FUNC(session_write_kbytes, 0444);
|
||||
EXT4_ATTR_FUNC(lifetime_write_kbytes, 0444);
|
||||
EXT4_ATTR_FUNC(reserved_clusters, 0644);
|
||||
|
||||
EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, inode_readahead,
|
||||
ext4_sb_info, 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);
|
||||
|
|
@ -225,9 +173,8 @@ 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_ATTR(trigger_fs_error, 0200, 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);
|
||||
|
|
@ -238,6 +185,9 @@ 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 unsigned int old_bump_val = 128;
|
||||
EXT4_ATTR_PTR(max_writeback_mb_bump, 0444, pointer_ui, &old_bump_val);
|
||||
|
||||
static struct attribute *ext4_attrs[] = {
|
||||
ATTR_LIST(delayed_allocation_blocks),
|
||||
ATTR_LIST(session_write_kbytes),
|
||||
|
|
@ -267,10 +217,10 @@ static struct attribute *ext4_attrs[] = {
|
|||
};
|
||||
|
||||
/* 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);
|
||||
EXT4_ATTR_FEATURE(lazy_itable_init);
|
||||
EXT4_ATTR_FEATURE(batched_discard);
|
||||
EXT4_ATTR_FEATURE(meta_bg_resize);
|
||||
EXT4_ATTR_FEATURE(encryption);
|
||||
|
||||
static struct attribute *ext4_feat_attrs[] = {
|
||||
ATTR_LIST(lazy_itable_init),
|
||||
|
|
@ -280,14 +230,56 @@ static struct attribute *ext4_feat_attrs[] = {
|
|||
NULL,
|
||||
};
|
||||
|
||||
static void *calc_ptr(struct ext4_attr *a, struct ext4_sb_info *sbi)
|
||||
{
|
||||
switch (a->attr_ptr) {
|
||||
case ptr_explicit:
|
||||
return a->u.explicit_ptr;
|
||||
case ptr_ext4_sb_info_offset:
|
||||
return (void *) (((char *) sbi) + a->u.offset);
|
||||
case ptr_ext4_super_block_offset:
|
||||
return (void *) (((char *) sbi->s_es) + a->u.offset);
|
||||
}
|
||||
return 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);
|
||||
void *ptr = calc_ptr(a, sbi);
|
||||
|
||||
return a->show ? a->show(a, sbi, buf) : 0;
|
||||
switch (a->attr_id) {
|
||||
case attr_delayed_allocation_blocks:
|
||||
return snprintf(buf, PAGE_SIZE, "%llu\n",
|
||||
(s64) EXT4_C2B(sbi,
|
||||
percpu_counter_sum(&sbi->s_dirtyclusters_counter)));
|
||||
case attr_session_write_kbytes:
|
||||
return session_write_kbytes_show(a, sbi, buf);
|
||||
case attr_lifetime_write_kbytes:
|
||||
return lifetime_write_kbytes_show(a, sbi, buf);
|
||||
case attr_reserved_clusters:
|
||||
return snprintf(buf, PAGE_SIZE, "%llu\n",
|
||||
(unsigned long long)
|
||||
atomic64_read(&sbi->s_resv_clusters));
|
||||
case attr_inode_readahead:
|
||||
case attr_pointer_ui:
|
||||
if (!ptr)
|
||||
return 0;
|
||||
return snprintf(buf, PAGE_SIZE, "%u\n",
|
||||
*((unsigned int *) ptr));
|
||||
case attr_pointer_atomic:
|
||||
if (!ptr)
|
||||
return 0;
|
||||
return snprintf(buf, PAGE_SIZE, "%d\n",
|
||||
atomic_read((atomic_t *) ptr));
|
||||
case attr_feature:
|
||||
return snprintf(buf, PAGE_SIZE, "supported\n");
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static ssize_t ext4_attr_store(struct kobject *kobj,
|
||||
|
|
@ -297,8 +289,27 @@ static ssize_t ext4_attr_store(struct kobject *kobj,
|
|||
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);
|
||||
void *ptr = calc_ptr(a, sbi);
|
||||
unsigned long t;
|
||||
int ret;
|
||||
|
||||
return a->store ? a->store(a, sbi, buf, len) : 0;
|
||||
switch (a->attr_id) {
|
||||
case attr_reserved_clusters:
|
||||
return reserved_clusters_store(a, sbi, buf, len);
|
||||
case attr_pointer_ui:
|
||||
if (!ptr)
|
||||
return 0;
|
||||
ret = kstrtoul(skip_spaces(buf), 0, &t);
|
||||
if (ret)
|
||||
return ret;
|
||||
*((unsigned int *) ptr) = t;
|
||||
return len;
|
||||
case attr_inode_readahead:
|
||||
return inode_readahead_blks_store(a, sbi, buf, len);
|
||||
case attr_trigger_test_error:
|
||||
return trigger_test_error(a, sbi, buf, len);
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void ext4_sb_release(struct kobject *kobj)
|
||||
|
|
@ -327,25 +338,9 @@ 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,
|
||||
.sysfs_ops = &ext4_attr_ops,
|
||||
};
|
||||
|
||||
static struct kobject ext4_feat = {
|
||||
|
|
|
|||
Loading…
Reference in New Issue
Block a user