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[readdir] convert configfs

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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2013-05-16 01:28:34 -04:00
parent 3903b38ce7
commit 52018855e6
1 changed files with 50 additions and 68 deletions
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118
fs/configfs/dir.c
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@ -1532,84 +1532,66 @@ static inline unsigned char dt_type(struct configfs_dirent *sd)
return (sd->s_mode >> 12) & 15;
}
static int configfs_readdir(struct file * filp, void * dirent, filldir_t filldir)
static int configfs_readdir(struct file *file, struct dir_context *ctx)
{
struct dentry *dentry = filp->f_path.dentry;
struct dentry *dentry = file->f_path.dentry;
struct super_block *sb = dentry->d_sb;
struct configfs_dirent * parent_sd = dentry->d_fsdata;
struct configfs_dirent *cursor = filp->private_data;
struct configfs_dirent *cursor = file->private_data;
struct list_head *p, *q = &cursor->s_sibling;
ino_t ino = 0;
int i = filp->f_pos;
switch (i) {
case 0:
ino = dentry->d_inode->i_ino;
if (filldir(dirent, ".", 1, i, ino, DT_DIR) < 0)
break;
filp->f_pos++;
i++;
/* fallthrough */
case 1:
ino = parent_ino(dentry);
if (filldir(dirent, "..", 2, i, ino, DT_DIR) < 0)
break;
filp->f_pos++;
i++;
/* fallthrough */
default:
if (filp->f_pos == 2) {
spin_lock(&configfs_dirent_lock);
list_move(q, &parent_sd->s_children);
spin_unlock(&configfs_dirent_lock);
}
for (p=q->next; p!= &parent_sd->s_children; p=p->next) {
struct configfs_dirent *next;
const char * name;
int len;
struct inode *inode = NULL;
if (!dir_emit_dots(file, ctx))
return 0;
if (ctx->pos == 2) {
spin_lock(&configfs_dirent_lock);
list_move(q, &parent_sd->s_children);
spin_unlock(&configfs_dirent_lock);
}
for (p = q->next; p != &parent_sd->s_children; p = p->next) {
struct configfs_dirent *next;
const char *name;
int len;
struct inode *inode = NULL;
next = list_entry(p, struct configfs_dirent,
s_sibling);
if (!next->s_element)
continue;
next = list_entry(p, struct configfs_dirent, s_sibling);
if (!next->s_element)
continue;
name = configfs_get_name(next);
len = strlen(name);
name = configfs_get_name(next);
len = strlen(name);
/*
* We'll have a dentry and an inode for
* PINNED items and for open attribute
* files. We lock here to prevent a race
* with configfs_d_iput() clearing
* s_dentry before calling iput().
*
* Why do we go to the trouble? If
* someone has an attribute file open,
* the inode number should match until
* they close it. Beyond that, we don't
* care.
*/
spin_lock(&configfs_dirent_lock);
dentry = next->s_dentry;
if (dentry)
inode = dentry->d_inode;
if (inode)
ino = inode->i_ino;
spin_unlock(&configfs_dirent_lock);
if (!inode)
ino = iunique(sb, 2);
/*
* We'll have a dentry and an inode for
* PINNED items and for open attribute
* files. We lock here to prevent a race
* with configfs_d_iput() clearing
* s_dentry before calling iput().
*
* Why do we go to the trouble? If
* someone has an attribute file open,
* the inode number should match until
* they close it. Beyond that, we don't
* care.
*/
spin_lock(&configfs_dirent_lock);
dentry = next->s_dentry;
if (dentry)
inode = dentry->d_inode;
if (inode)
ino = inode->i_ino;
spin_unlock(&configfs_dirent_lock);
if (!inode)
ino = iunique(sb, 2);
if (filldir(dirent, name, len, filp->f_pos, ino,
dt_type(next)) < 0)
return 0;
if (!dir_emit(ctx, name, len, ino, dt_type(next)))
return 0;
spin_lock(&configfs_dirent_lock);
list_move(q, p);
spin_unlock(&configfs_dirent_lock);
p = q;
filp->f_pos++;
}
spin_lock(&configfs_dirent_lock);
list_move(q, p);
spin_unlock(&configfs_dirent_lock);
p = q;
ctx->pos++;
}
return 0;
}
@ -1661,7 +1643,7 @@ const struct file_operations configfs_dir_operations = {
.release = configfs_dir_close,
.llseek = configfs_dir_lseek,
.read = generic_read_dir,
.readdir = configfs_readdir,
.iterate = configfs_readdir,
};
int configfs_register_subsystem(struct configfs_subsystem *subsys)