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-rw-r--r--fs/sysfs/dir.c82
1 files changed, 60 insertions, 22 deletions
diff --git a/fs/sysfs/dir.c b/fs/sysfs/dir.c
index 699f371b9f12..5c4703d751b5 100644
--- a/fs/sysfs/dir.c
+++ b/fs/sysfs/dir.c
@@ -837,11 +837,46 @@ static inline unsigned char dt_type(struct sysfs_dirent *sd)
return (sd->s_mode >> 12) & 15;
}
+static int sysfs_dir_release(struct inode *inode, struct file *filp)
+{
+ sysfs_put(filp->private_data);
+ return 0;
+}
+
+static struct sysfs_dirent *sysfs_dir_pos(struct sysfs_dirent *parent_sd,
+ ino_t ino, struct sysfs_dirent *pos)
+{
+ if (pos) {
+ int valid = !(pos->s_flags & SYSFS_FLAG_REMOVED) &&
+ pos->s_parent == parent_sd &&
+ ino == pos->s_ino;
+ sysfs_put(pos);
+ if (valid)
+ return pos;
+ }
+ pos = NULL;
+ if ((ino > 1) && (ino < INT_MAX)) {
+ pos = parent_sd->s_dir.children;
+ while (pos && (ino > pos->s_ino))
+ pos = pos->s_sibling;
+ }
+ return pos;
+}
+
+static struct sysfs_dirent *sysfs_dir_next_pos(struct sysfs_dirent *parent_sd,
+ ino_t ino, struct sysfs_dirent *pos)
+{
+ pos = sysfs_dir_pos(parent_sd, ino, pos);
+ if (pos)
+ pos = pos->s_sibling;
+ return pos;
+}
+
static int sysfs_readdir(struct file * filp, void * dirent, filldir_t filldir)
{
struct dentry *dentry = filp->f_path.dentry;
struct sysfs_dirent * parent_sd = dentry->d_fsdata;
- struct sysfs_dirent *pos;
+ struct sysfs_dirent *pos = filp->private_data;
ino_t ino;
if (filp->f_pos == 0) {
@@ -857,29 +892,31 @@ static int sysfs_readdir(struct file * filp, void * dirent, filldir_t filldir)
if (filldir(dirent, "..", 2, filp->f_pos, ino, DT_DIR) == 0)
filp->f_pos++;
}
- if ((filp->f_pos > 1) && (filp->f_pos < INT_MAX)) {
- mutex_lock(&sysfs_mutex);
-
- /* Skip the dentries we have already reported */
- pos = parent_sd->s_dir.children;
- while (pos && (filp->f_pos > pos->s_ino))
- pos = pos->s_sibling;
-
- for ( ; pos; pos = pos->s_sibling) {
- const char * name;
- int len;
-
- name = pos->s_name;
- len = strlen(name);
- filp->f_pos = ino = pos->s_ino;
+ mutex_lock(&sysfs_mutex);
+ for (pos = sysfs_dir_pos(parent_sd, filp->f_pos, pos);
+ pos;
+ pos = sysfs_dir_next_pos(parent_sd, filp->f_pos, pos)) {
+ const char * name;
+ unsigned int type;
+ int len, ret;
+
+ name = pos->s_name;
+ len = strlen(name);
+ ino = pos->s_ino;
+ type = dt_type(pos);
+ filp->f_pos = ino;
+ filp->private_data = sysfs_get(pos);
- if (filldir(dirent, name, len, filp->f_pos, ino,
- dt_type(pos)) < 0)
- break;
- }
- if (!pos)
- filp->f_pos = INT_MAX;
mutex_unlock(&sysfs_mutex);
+ ret = filldir(dirent, name, len, filp->f_pos, ino, type);
+ mutex_lock(&sysfs_mutex);
+ if (ret < 0)
+ break;
+ }
+ mutex_unlock(&sysfs_mutex);
+ if ((filp->f_pos > 1) && !pos) { /* EOF */
+ filp->f_pos = INT_MAX;
+ filp->private_data = NULL;
}
return 0;
}
@@ -888,5 +925,6 @@ static int sysfs_readdir(struct file * filp, void * dirent, filldir_t filldir)
const struct file_operations sysfs_dir_operations = {
.read = generic_read_dir,
.readdir = sysfs_readdir,
+ .release = sysfs_dir_release,
.llseek = generic_file_llseek,
};