This is a note to let you know that I've just added the patch titled
ext4: refactor out ext4_generic_attr_show()
to the 6.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
ext4-refactor-out-ext4_generic_attr_show.patch
and it can be found in the queue-6.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit e8509b358a91de4cab5b87f20011cd3fa492cf01
Author: Baokun Li <libaokun1@xxxxxxxxxx>
Date: Tue Mar 19 19:33:19 2024 +0800
ext4: refactor out ext4_generic_attr_show()
[ Upstream commit 57341fe3179c7694c92dcf99e7f836cee4c800dd ]
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@xxxxxxxxxx>
Reviewed-by: Zhang Yi <yi.zhang@xxxxxxxxxx>
Reviewed-by: Jan Kara <jack@xxxxxxx>
Link: https://lore.kernel.org/r/20240319113325.3110393-4-libaokun1@xxxxxxxxxx
Signed-off-by: Theodore Ts'o <tytso@xxxxxxx>
Stable-dep-of: 13df4d44a3aa ("ext4: fix slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists()")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/fs/ext4/sysfs.c b/fs/ext4/sysfs.c
index ca820620b9742..295ea9a32de91 100644
--- a/fs/ext4/sysfs.c
+++ b/fs/ext4/sysfs.c
@@ -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_attr_store(struct kobject *kobj,
