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authorAl Viro <viro@zeniv.linux.org.uk>2016-04-20 19:50:05 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2016-05-09 11:41:13 -0400
commita01b3007ffb9be0180e744f0d15b130b0a76a29f (patch)
tree5ccfce3fe8e64828e99303133278c9d075817503 /fs/configfs
parent884be175351e73c515303118150f195dd611787c (diff)
downloadlinux-rt-a01b3007ffb9be0180e744f0d15b130b0a76a29f.tar.gz
configfs_readdir(): make safe under shared lock
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/configfs')
-rw-r--r--fs/configfs/dir.c20
1 files changed, 7 insertions, 13 deletions
diff --git a/fs/configfs/dir.c b/fs/configfs/dir.c
index 48929c408e04..56fb26127fef 100644
--- a/fs/configfs/dir.c
+++ b/fs/configfs/dir.c
@@ -1633,11 +1633,9 @@ static int configfs_readdir(struct file *file, struct dir_context *ctx)
if (!dir_emit_dots(file, ctx))
return 0;
- if (ctx->pos == 2) {
- spin_lock(&configfs_dirent_lock);
+ spin_lock(&configfs_dirent_lock);
+ if (ctx->pos == 2)
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;
@@ -1648,9 +1646,6 @@ static int configfs_readdir(struct file *file, struct dir_context *ctx)
if (!next->s_element)
continue;
- name = configfs_get_name(next);
- len = strlen(name);
-
/*
* We'll have a dentry and an inode for
* PINNED items and for open attribute
@@ -1664,7 +1659,6 @@ static int configfs_readdir(struct file *file, struct dir_context *ctx)
* they close it. Beyond that, we don't
* care.
*/
- spin_lock(&configfs_dirent_lock);
dentry = next->s_dentry;
if (dentry)
inode = d_inode(dentry);
@@ -1674,15 +1668,18 @@ static int configfs_readdir(struct file *file, struct dir_context *ctx)
if (!inode)
ino = iunique(sb, 2);
+ name = configfs_get_name(next);
+ len = strlen(name);
+
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;
ctx->pos++;
}
+ spin_unlock(&configfs_dirent_lock);
return 0;
}
@@ -1690,7 +1687,6 @@ static loff_t configfs_dir_lseek(struct file *file, loff_t offset, int whence)
{
struct dentry * dentry = file->f_path.dentry;
- inode_lock(d_inode(dentry));
switch (whence) {
case 1:
offset += file->f_pos;
@@ -1698,7 +1694,6 @@ static loff_t configfs_dir_lseek(struct file *file, loff_t offset, int whence)
if (offset >= 0)
break;
default:
- inode_unlock(d_inode(dentry));
return -EINVAL;
}
if (offset != file->f_pos) {
@@ -1724,7 +1719,6 @@ static loff_t configfs_dir_lseek(struct file *file, loff_t offset, int whence)
spin_unlock(&configfs_dirent_lock);
}
}
- inode_unlock(d_inode(dentry));
return offset;
}
@@ -1733,7 +1727,7 @@ const struct file_operations configfs_dir_operations = {
.release = configfs_dir_close,
.llseek = configfs_dir_lseek,
.read = generic_read_dir,
- .iterate = configfs_readdir,
+ .iterate_shared = configfs_readdir,
};
/**