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[readdir] convert sysfs 

get rid of the kludges in sysfs_readdir()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2013-05-16 14:31:02 -04:00
parent d81a8ef598
commit d55fea8ddb
1 changed files with 18 additions and 48 deletions
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66
fs/sysfs/dir.c
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@ -998,68 +998,38 @@ static struct sysfs_dirent *sysfs_dir_next_pos(const void *ns,
return pos;
}
static int sysfs_readdir(struct file * filp, void * dirent, filldir_t filldir)
static int sysfs_readdir(struct file *file, struct dir_context *ctx)
{
struct dentry *dentry = filp->f_path.dentry;
struct dentry *dentry = file->f_path.dentry;
struct sysfs_dirent * parent_sd = dentry->d_fsdata;
struct sysfs_dirent *pos = filp->private_data;
struct sysfs_dirent *pos = file->private_data;
enum kobj_ns_type type;
const void *ns;
ino_t ino;
loff_t off;
type = sysfs_ns_type(parent_sd);
ns = sysfs_info(dentry->d_sb)->ns[type];
if (filp->f_pos == 0) {
ino = parent_sd->s_ino;
if (filldir(dirent, ".", 1, filp->f_pos, ino, DT_DIR) == 0)
filp->f_pos++;
else
return 0;
}
if (filp->f_pos == 1) {
if (parent_sd->s_parent)
ino = parent_sd->s_parent->s_ino;
else
ino = parent_sd->s_ino;
if (filldir(dirent, "..", 2, filp->f_pos, ino, DT_DIR) == 0)
filp->f_pos++;
else
return 0;
}
if (!dir_emit_dots(file, ctx))
return 0;
mutex_lock(&sysfs_mutex);
off = filp->f_pos;
for (pos = sysfs_dir_pos(ns, parent_sd, filp->f_pos, pos);
for (pos = sysfs_dir_pos(ns, parent_sd, ctx->pos, pos);
pos;
pos = sysfs_dir_next_pos(ns, 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);
off = filp->f_pos = pos->s_hash;
filp->private_data = sysfs_get(pos);
pos = sysfs_dir_next_pos(ns, parent_sd, ctx->pos, pos)) {
const char *name = pos->s_name;
unsigned int type = dt_type(pos);
int len = strlen(name);
ino_t ino = pos->s_ino;
ctx->pos = pos->s_hash;
file->private_data = sysfs_get(pos);
mutex_unlock(&sysfs_mutex);
ret = filldir(dirent, name, len, off, ino, type);
if (!dir_emit(ctx, name, len, ino, type))
return 0;
mutex_lock(&sysfs_mutex);
if (ret < 0)
break;
}
mutex_unlock(&sysfs_mutex);
/* don't reference last entry if its refcount is dropped */
if (!pos) {
filp->private_data = NULL;
/* EOF and not changed as 0 or 1 in read/write path */
if (off == filp->f_pos && off > 1)
filp->f_pos = INT_MAX;
}
file->private_data = NULL;
ctx->pos = INT_MAX;
return 0;
}
@ -1077,7 +1047,7 @@ static loff_t sysfs_dir_llseek(struct file *file, loff_t offset, int whence)
const struct file_operations sysfs_dir_operations = {
.read = generic_read_dir,
.readdir = sysfs_readdir,
.iterate = sysfs_readdir,
.release = sysfs_dir_release,
.llseek = sysfs_dir_llseek,
};