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ext4: refactor out ext4_generic_attr_show()

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Refactor out the function ext4_generic_attr_show() to handle the reading
of values of various common types, with no functional changes.

Signed-off-by: Baokun Li <libaokun1@huawei.com>
Reviewed-by: Zhang Yi <yi.zhang@huawei.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20240319113325.3110393-4-libaokun1@huawei.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Baokun Li 2024-03-19 19:33:19 +08:00 committed by Theodore Ts'o
parent f536808adc
commit 57341fe317
1 changed files with 32 additions and 42 deletions
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74
fs/ext4/sysfs.c
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@ -366,13 +366,42 @@ static ssize_t __print_tstamp(char *buf, __le32 lo, __u8 hi)
#define print_tstamp(buf, es, tstamp) \
__print_tstamp(buf, (es)->tstamp, (es)->tstamp ## _hi)
static ssize_t ext4_generic_attr_show(struct ext4_attr *a,
struct ext4_sb_info *sbi, char *buf)
{
void *ptr = calc_ptr(a, sbi);
if (!ptr)
return 0;
switch (a->attr_id) {
case attr_inode_readahead:
case attr_pointer_ui:
if (a->attr_ptr == ptr_ext4_super_block_offset)
return sysfs_emit(buf, "%u\n", le32_to_cpup(ptr));
return sysfs_emit(buf, "%u\n", *((unsigned int *) ptr));
case attr_pointer_ul:
return sysfs_emit(buf, "%lu\n", *((unsigned long *) ptr));
case attr_pointer_u8:
return sysfs_emit(buf, "%u\n", *((unsigned char *) ptr));
case attr_pointer_u64:
if (a->attr_ptr == ptr_ext4_super_block_offset)
return sysfs_emit(buf, "%llu\n", le64_to_cpup(ptr));
return sysfs_emit(buf, "%llu\n", *((unsigned long long *) ptr));
case attr_pointer_string:
return sysfs_emit(buf, "%.*s\n", a->attr_size, (char *) ptr);
case attr_pointer_atomic:
return sysfs_emit(buf, "%d\n", atomic_read((atomic_t *) ptr));
}
return 0;
}
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);
switch (a->attr_id) {
case attr_delayed_allocation_blocks:
@ -391,45 +420,6 @@ static ssize_t ext4_attr_show(struct kobject *kobj,
return sysfs_emit(buf, "%llu\n",
(unsigned long long)
percpu_counter_sum(&sbi->s_sra_exceeded_retry_limit));
case attr_inode_readahead:
case attr_pointer_ui:
if (!ptr)
return 0;
if (a->attr_ptr == ptr_ext4_super_block_offset)
return sysfs_emit(buf, "%u\n",
le32_to_cpup(ptr));
else
return sysfs_emit(buf, "%u\n",
*((unsigned int *) ptr));
case attr_pointer_ul:
if (!ptr)
return 0;
return sysfs_emit(buf, "%lu\n",
*((unsigned long *) ptr));
case attr_pointer_u8:
if (!ptr)
return 0;
return sysfs_emit(buf, "%u\n",
*((unsigned char *) ptr));
case attr_pointer_u64:
if (!ptr)
return 0;
if (a->attr_ptr == ptr_ext4_super_block_offset)
return sysfs_emit(buf, "%llu\n",
le64_to_cpup(ptr));
else
return sysfs_emit(buf, "%llu\n",
*((unsigned long long *) ptr));
case attr_pointer_string:
if (!ptr)
return 0;
return sysfs_emit(buf, "%.*s\n", a->attr_size,
(char *) ptr);
case attr_pointer_atomic:
if (!ptr)
return 0;
return sysfs_emit(buf, "%d\n",
atomic_read((atomic_t *) ptr));
case attr_feature:
return sysfs_emit(buf, "supported\n");
case attr_first_error_time:
@ -438,9 +428,9 @@ static ssize_t ext4_attr_show(struct kobject *kobj,
return print_tstamp(buf, sbi->s_es, s_last_error_time);
case attr_journal_task:
return journal_task_show(sbi, buf);
default:
return ext4_generic_attr_show(a, sbi, buf);
}
return 0;
}
static ssize_t ext4_generic_attr_store(struct ext4_attr *a,