sysfs: rename sysfs_dirent->s_type to s_flags and make room for flags

Rename sysfs_dirent->s_type to s_flags, pack type into lower eight
bits and reserve the rest for flags.  sysfs_type() can used to access
the type.  All existing sd->s_type accesses are converted to use
sysfs_type().  While at it, type test is changed to equality test
instead of bit-and test where appropriate.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

5 files changed, 34 insertions, 19 deletions

diff --git a/fs/sysfs/dir.c b/fs/sysfs/dir.c
index b4074adbab01..eb9bc0a8717b 100644
--- a/fs/sysfs/dir.c
+++ b/fs/sysfs/dir.c
@@ -218,9 +218,9 @@ void release_sysfs_dirent(struct sysfs_dirent * sd)
  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(const char *name, umode_t mode, int type)
 
         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_dirent *parent_sd,
         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(struct inode *dir, struct dentry *dentry,
 {
         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(struct inode *dir, struct dentry *dentry,
 
         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);
@@ -532,7 +539,7 @@ static void __sysfs_remove_dir(struct dentry *dentry)
         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)) {
                         *pos = sd->s_sibling;
                         sd->s_sibling = removed;
                         removed = sd;
@@ -775,7 +782,7 @@ static int sysfs_readdir(struct file * filp, void * dirent, filldir_t filldir)
                                 const char * name;
                                 int len;
 
-                                if (!next->s_type)
+                                if (!sysfs_type(next))
                                         continue;
 
                                 name = next->s_name;
@@ -824,7 +831,7 @@ static loff_t sysfs_dir_lseek(struct file * file, loff_t offset, int origin)
                         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 63daa06c4194..ee3a5d957051 100644
--- a/fs/sysfs/inode.c
+++ b/fs/sysfs/inode.c
@@ -242,7 +242,7 @@ void sysfs_drop_dentry(struct sysfs_dirent *sd)
 
         dput(dentry);
         /* XXX: unpin if directory, this will go away soon */
-        if (sd->s_type & SYSFS_DIR)
+        if (sysfs_type(sd) == SYSFS_DIR)
                 dput(dentry);
 
         /* adjust nlink and update timestamp */
@@ -254,7 +254,7 @@ void sysfs_drop_dentry(struct sysfs_dirent *sd)
 
                 inode->i_ctime = curtime;
                 drop_nlink(inode);
-                if (sd->s_type & SYSFS_DIR)
+                if (sysfs_type(sd) == SYSFS_DIR)
                         drop_nlink(inode);
 
                 mutex_unlock(&inode->i_mutex);
@@ -267,7 +267,7 @@ void sysfs_drop_dentry(struct sysfs_dirent *sd)
                 mutex_lock(&inode->i_mutex);
 
                 inode->i_ctime = inode->i_mtime = curtime;
-                if (sd->s_type & SYSFS_DIR)
+                if (sysfs_type(sd) == SYSFS_DIR)
                         drop_nlink(inode);
 
                 mutex_unlock(&inode->i_mutex);
@@ -293,7 +293,7 @@ int sysfs_hash_and_remove(struct dentry * dir, const char * name)
         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)) {
                         *pos = sd->s_sibling;
diff --git a/fs/sysfs/mount.c b/fs/sysfs/mount.c
index 4be9593ea000..078537e5d696 100644
--- a/fs/sysfs/mount.c
+++ b/fs/sysfs/mount.c
@@ -26,7 +26,7 @@ static const struct super_operations sysfs_ops = {
 
 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 6f8aaf3805d2..06b5085804a1 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_fops;
 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 161e19aa2b4f..58135509023e 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 +83,8 @@ 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
+
 #ifdef CONFIG_SYSFS
 
 extern int sysfs_schedule_callback(struct kobject *kobj,