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authorTheodore Ts'o <tytso@mit.edu>2015-09-23 12:46:17 -0400
committerTheodore Ts'o <tytso@mit.edu>2015-09-23 12:46:17 -0400
commitebd173beb8db5b8b315fa1c5bbac86c54059397a (patch)
tree2150c4685e1b44c0435632ea27bd417293d999f7 /fs/ext4/sysfs.c
parent76d33bca5581b1dd5c3157fa168db849a784ada4 (diff)
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ext4: move procfs registration code to fs/ext4/sysfs.c
This allows us to refactor the procfs code, which saves a bit of compiled space. More importantly it isolates most of the procfs support code into a single file, so it's easier to #ifdef it out if the proc file system has been disabled. Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'fs/ext4/sysfs.c')
-rw-r--r--fs/ext4/sysfs.c68
1 files changed, 66 insertions, 2 deletions
diff --git a/fs/ext4/sysfs.c b/fs/ext4/sysfs.c
index 87ac08964683..62bef0f06421 100644
--- a/fs/ext4/sysfs.c
+++ b/fs/ext4/sysfs.c
@@ -34,6 +34,9 @@ typedef enum {
ptr_ext4_super_block_offset,
} attr_ptr_t;
+static const char *proc_dirname = "fs/ext4";
+static struct proc_dir_entry *ext4_proc_root;
+
struct ext4_attr {
struct attribute attr;
short attr_id;
@@ -347,14 +350,71 @@ static struct kobject ext4_feat = {
.kset = &ext4_kset,
};
+#define PROC_FILE_SHOW_DEFN(name) \
+static int name##_open(struct inode *inode, struct file *file) \
+{ \
+ return single_open(file, ext4_seq_##name##_show, PDE_DATA(inode)); \
+} \
+\
+const struct file_operations ext4_seq_##name##_fops = { \
+ .owner = THIS_MODULE, \
+ .open = name##_open, \
+ .read = seq_read, \
+ .llseek = seq_lseek, \
+ .release = single_release, \
+}
+
+#define PROC_FILE_LIST(name) \
+ { __stringify(name), &ext4_seq_##name##_fops }
+
+PROC_FILE_SHOW_DEFN(es_shrinker_info);
+PROC_FILE_SHOW_DEFN(options);
+
+static struct ext4_proc_files {
+ const char *name;
+ const struct file_operations *fops;
+} proc_files[] = {
+ PROC_FILE_LIST(options),
+ PROC_FILE_LIST(es_shrinker_info),
+ PROC_FILE_LIST(mb_groups),
+ { NULL, NULL },
+};
+
int ext4_register_sysfs(struct super_block *sb)
{
struct ext4_sb_info *sbi = EXT4_SB(sb);
+ struct ext4_proc_files *p;
+ int err;
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);
+ err = kobject_init_and_add(&sbi->s_kobj, &ext4_sb_ktype, NULL,
+ "%s", sb->s_id);
+ if (err)
+ return err;
+
+ if (ext4_proc_root)
+ sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
+
+ if (sbi->s_proc) {
+ for (p = proc_files; p->name; p++)
+ proc_create_data(p->name, S_IRUGO, sbi->s_proc,
+ p->fops, sb);
+ }
+ return 0;
+}
+
+void ext4_unregister_sysfs(struct super_block *sb)
+{
+ struct ext4_sb_info *sbi = EXT4_SB(sb);
+ struct ext4_proc_files *p;
+
+ if (sbi->s_proc) {
+ for (p = proc_files; p->name; p++)
+ remove_proc_entry(p->name, sbi->s_proc);
+ remove_proc_entry(sb->s_id, ext4_proc_root);
+ }
+ kobject_del(&sbi->s_kobj);
}
int __init ext4_init_sysfs(void)
@@ -371,6 +431,8 @@ int __init ext4_init_sysfs(void)
NULL, "features");
if (ret)
kset_unregister(&ext4_kset);
+ else
+ ext4_proc_root = proc_mkdir(proc_dirname, NULL);
return ret;
}
@@ -378,5 +440,7 @@ void ext4_exit_sysfs(void)
{
kobject_put(&ext4_feat);
kset_unregister(&ext4_kset);
+ remove_proc_entry(proc_dirname, NULL);
+ ext4_proc_root = NULL;
}