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Subject[PATCH 1/6] sysfs: implement sysfs flags and SYSFS_FLAG_REMOVED
Date
From
Rename sysfs_dirent->s_type to s_flags, pack type into lower eight
bits and use the rest for flags. sysfs_type() can used to access the
type. This patch also implements SYSFS_FLAG_REMOVED which is used to
improve sanity check in sysfs_deactivate(). The flag will also be
used to make directory entries reclamiable.

Signed-off-by: Tejun Heo <htejun@gmail.com>
---
fs/sysfs/dir.c | 37 +++++++++++++++++++++++--------------
fs/sysfs/inode.c | 5 +++--
fs/sysfs/mount.c | 2 +-
fs/sysfs/sysfs.h | 7 ++++++-
include/linux/sysfs.h | 4 ++++
5 files changed, 37 insertions(+), 18 deletions(-)

diff --git a/fs/sysfs/dir.c b/fs/sysfs/dir.c
index b4074ad..4a2bd8b 100644
--- a/fs/sysfs/dir.c
+++ b/fs/sysfs/dir.c
@@ -171,7 +171,7 @@ void sysfs_deactivate(struct sysfs_diren
DECLARE_COMPLETION_ONSTACK(wait);
int v;

- BUG_ON(sd->s_sibling);
+ BUG_ON(sd->s_sibling || !(sd->s_flags & SYSFS_FLAG_REMOVED));
sd->s_sibling = (void *)&wait;

/* atomic_add_return() is a mb(), put_active() will always see
@@ -218,9 +218,9 @@ void release_sysfs_dirent(struct sysfs_d
repeat:
parent_sd = sd->s_parent;

- if (sd->s_type & SYSFS_KOBJ_LINK)
+ if (sysfs_type(sd) & SYSFS_KOBJ_LINK)
sysfs_put(sd->s_elem.symlink.target_sd);
- if (sd->s_type & SYSFS_COPY_NAME)
+ if (sysfs_type(sd) & SYSFS_COPY_NAME)
kfree(sd->s_name);
kfree(sd->s_iattr);
sysfs_free_ino(sd->s_ino);
@@ -282,7 +282,7 @@ struct sysfs_dirent *sysfs_new_dirent(co

sd->s_name = name;
sd->s_mode = mode;
- sd->s_type = type;
+ sd->s_flags = type;

return sd;

@@ -330,7 +330,7 @@ int sysfs_dirent_exist(struct sysfs_dire
struct sysfs_dirent * sd;

for (sd = parent_sd->s_children; sd; sd = sd->s_sibling) {
- if (sd->s_type) {
+ if (sysfs_type(sd)) {
if (strcmp(sd->s_name, new))
continue;
else
@@ -446,11 +446,12 @@ static struct dentry * sysfs_lookup(stru
{
struct sysfs_dirent * parent_sd = dentry->d_parent->d_fsdata;
struct sysfs_dirent * sd;
+ struct bin_attribute *bin_attr;
struct inode *inode;
int found = 0;

for (sd = parent_sd->s_children; sd; sd = sd->s_sibling) {
- if ((sd->s_type & SYSFS_NOT_PINNED) &&
+ if ((sysfs_type(sd) & SYSFS_NOT_PINNED) &&
!strcmp(sd->s_name, dentry->d_name.name)) {
found = 1;
break;
@@ -468,16 +469,22 @@ static struct dentry * sysfs_lookup(stru

if (inode->i_state & I_NEW) {
/* initialize inode according to type */
- if (sd->s_type & SYSFS_KOBJ_ATTR) {
+ switch (sysfs_type(sd)) {
+ case SYSFS_KOBJ_ATTR:
inode->i_size = PAGE_SIZE;
inode->i_fop = &sysfs_file_operations;
- } else if (sd->s_type & SYSFS_KOBJ_BIN_ATTR) {
- struct bin_attribute *bin_attr =
- sd->s_elem.bin_attr.bin_attr;
+ break;
+ case SYSFS_KOBJ_BIN_ATTR:
+ bin_attr = sd->s_elem.bin_attr.bin_attr;
inode->i_size = bin_attr->size;
inode->i_fop = &bin_fops;
- } else if (sd->s_type & SYSFS_KOBJ_LINK)
+ break;
+ case SYSFS_KOBJ_LINK:
inode->i_op = &sysfs_symlink_inode_operations;
+ break;
+ default:
+ BUG();
+ }
}

sysfs_instantiate(dentry, inode);
@@ -499,6 +506,7 @@ static void remove_dir(struct dentry * d
mutex_lock(&parent->d_inode->i_mutex);

sysfs_unlink_sibling(sd);
+ sd->s_flags |= SYSFS_FLAG_REMOVED;

pr_debug(" o %s removing done (%d)\n",d->d_name.name,
atomic_read(&d->d_count));
@@ -532,7 +540,8 @@ static void __sysfs_remove_dir(struct de
while (*pos) {
struct sysfs_dirent *sd = *pos;

- if (sd->s_type && (sd->s_type & SYSFS_NOT_PINNED)) {
+ if (sysfs_type(sd) && (sysfs_type(sd) & SYSFS_NOT_PINNED)) {
+ sd->s_flags |= SYSFS_FLAG_REMOVED;
*pos = sd->s_sibling;
sd->s_sibling = removed;
removed = sd;
@@ -775,7 +784,7 @@ static int sysfs_readdir(struct file * f
const char * name;
int len;

- if (!next->s_type)
+ if (!sysfs_type(next))
continue;

name = next->s_name;
@@ -824,7 +833,7 @@ static loff_t sysfs_dir_lseek(struct fil
pos = &sd->s_children;
while (n && *pos) {
struct sysfs_dirent *next = *pos;
- if (next->s_type)
+ if (sysfs_type(next))
n--;
pos = &(*pos)->s_sibling;
}
diff --git a/fs/sysfs/inode.c b/fs/sysfs/inode.c
index 4d79a61..b67623d 100644
--- a/fs/sysfs/inode.c
+++ b/fs/sysfs/inode.c
@@ -264,7 +264,7 @@ void sysfs_drop_dentry(struct sysfs_dire
if (dentry) {
dentry->d_inode->i_ctime = curtime;
drop_nlink(dentry->d_inode);
- if (sd->s_type & SYSFS_DIR) {
+ if (sysfs_type(sd) & SYSFS_DIR) {
drop_nlink(dentry->d_inode);
drop_nlink(dir);
/* XXX: unpin if directory, this will go away soon */
@@ -298,9 +298,10 @@ int sysfs_hash_and_remove(struct dentry
for (pos = &parent_sd->s_children; *pos; pos = &(*pos)->s_sibling) {
sd = *pos;

- if (!sd->s_type)
+ if (!sysfs_type(sd))
continue;
if (!strcmp(sd->s_name, name)) {
+ sd->s_flags |= SYSFS_FLAG_REMOVED;
*pos = sd->s_sibling;
sd->s_sibling = NULL;
found = 1;
diff --git a/fs/sysfs/mount.c b/fs/sysfs/mount.c
index 2e66701..d5ce3aa 100644
--- a/fs/sysfs/mount.c
+++ b/fs/sysfs/mount.c
@@ -24,7 +24,7 @@ static const struct super_operations sys

static struct sysfs_dirent sysfs_root = {
.s_count = ATOMIC_INIT(1),
- .s_type = SYSFS_ROOT,
+ .s_flags = SYSFS_ROOT,
.s_mode = S_IFDIR | S_IRWXU | S_IRUGO | S_IXUGO,
.s_ino = 1,
};
diff --git a/fs/sysfs/sysfs.h b/fs/sysfs/sysfs.h
index 6f8aaf3..06b5085 100644
--- a/fs/sysfs/sysfs.h
+++ b/fs/sysfs/sysfs.h
@@ -34,7 +34,7 @@ struct sysfs_dirent {
struct sysfs_elem_bin_attr bin_attr;
} s_elem;

- int s_type;
+ unsigned int s_flags;
umode_t s_mode;
ino_t s_ino;
struct dentry * s_dentry;
@@ -86,6 +86,11 @@ extern const struct file_operations bin_
extern const struct inode_operations sysfs_dir_inode_operations;
extern const struct inode_operations sysfs_symlink_inode_operations;

+static inline unsigned int sysfs_type(struct sysfs_dirent *sd)
+{
+ return sd->s_flags & SYSFS_TYPE_MASK;
+}
+
static inline struct sysfs_dirent * sysfs_get(struct sysfs_dirent * sd)
{
if (sd) {
diff --git a/include/linux/sysfs.h b/include/linux/sysfs.h
index 161e19a..2a6df64 100644
--- a/include/linux/sysfs.h
+++ b/include/linux/sysfs.h
@@ -74,6 +74,7 @@ struct sysfs_ops {
ssize_t (*store)(struct kobject *,struct attribute *,const char *, size_t);
};

+#define SYSFS_TYPE_MASK 0x00ff
#define SYSFS_ROOT 0x0001
#define SYSFS_DIR 0x0002
#define SYSFS_KOBJ_ATTR 0x0004
@@ -82,6 +83,9 @@ struct sysfs_ops {
#define SYSFS_NOT_PINNED (SYSFS_KOBJ_ATTR | SYSFS_KOBJ_BIN_ATTR | SYSFS_KOBJ_LINK)
#define SYSFS_COPY_NAME (SYSFS_DIR | SYSFS_KOBJ_LINK)

+#define SYSFS_FLAG_MASK ~SYSFS_TYPE_MASK
+#define SYSFS_FLAG_REMOVED 0x0100
+
#ifdef CONFIG_SYSFS

extern int sysfs_schedule_callback(struct kobject *kobj,
--
1.4.3.4

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