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Diffstat (limited to 'fs/debugfs/inode.c')
-rw-r--r--fs/debugfs/inode.c55
1 files changed, 38 insertions, 17 deletions
diff --git a/fs/debugfs/inode.c b/fs/debugfs/inode.c
index acef14ad53db..042b688ed124 100644
--- a/fs/debugfs/inode.c
+++ b/fs/debugfs/inode.c
@@ -2,13 +2,16 @@
/*
* inode.c - part of debugfs, a tiny little debug file system
*
- * Copyright (C) 2004 Greg Kroah-Hartman <greg@kroah.com>
+ * Copyright (C) 2004,2019 Greg Kroah-Hartman <greg@kroah.com>
* Copyright (C) 2004 IBM Inc.
+ * Copyright (C) 2019 Linux Foundation <gregkh@linuxfoundation.org>
*
* debugfs is for people to use instead of /proc or /sys.
* See ./Documentation/core-api/kernel-api.rst for more details.
*/
+#define pr_fmt(fmt) "debugfs: " fmt
+
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/mount.h>
@@ -285,15 +288,17 @@ static struct dentry *start_creating(const char *name, struct dentry *parent)
struct dentry *dentry;
int error;
- pr_debug("debugfs: creating file '%s'\n",name);
+ pr_debug("creating file '%s'\n", name);
if (IS_ERR(parent))
return parent;
error = simple_pin_fs(&debug_fs_type, &debugfs_mount,
&debugfs_mount_count);
- if (error)
+ if (error) {
+ pr_err("Unable to pin filesystem for file '%s'\n", name);
return ERR_PTR(error);
+ }
/* If the parent is not specified, we create it in the root.
* We need the root dentry to do this, which is in the super
@@ -306,6 +311,12 @@ static struct dentry *start_creating(const char *name, struct dentry *parent)
inode_lock(d_inode(parent));
dentry = lookup_one_len(name, parent, strlen(name));
if (!IS_ERR(dentry) && d_really_is_positive(dentry)) {
+ if (d_is_dir(dentry))
+ pr_err("Directory '%s' with parent '%s' already present!\n",
+ name, parent->d_name.name);
+ else
+ pr_err("File '%s' in directory '%s' already present!\n",
+ name, parent->d_name.name);
dput(dentry);
dentry = ERR_PTR(-EEXIST);
}
@@ -349,8 +360,11 @@ static struct dentry *__debugfs_create_file(const char *name, umode_t mode,
return dentry;
inode = debugfs_get_inode(dentry->d_sb);
- if (unlikely(!inode))
+ if (unlikely(!inode)) {
+ pr_err("out of free dentries, can not create file '%s'\n",
+ name);
return failed_creating(dentry);
+ }
inode->i_mode = mode;
inode->i_private = data;
@@ -511,8 +525,11 @@ struct dentry *debugfs_create_dir(const char *name, struct dentry *parent)
return dentry;
inode = debugfs_get_inode(dentry->d_sb);
- if (unlikely(!inode))
+ if (unlikely(!inode)) {
+ pr_err("out of free dentries, can not create directory '%s'\n",
+ name);
return failed_creating(dentry);
+ }
inode->i_mode = S_IFDIR | S_IRWXU | S_IRUGO | S_IXUGO;
inode->i_op = &simple_dir_inode_operations;
@@ -550,8 +567,11 @@ struct dentry *debugfs_create_automount(const char *name,
return dentry;
inode = debugfs_get_inode(dentry->d_sb);
- if (unlikely(!inode))
+ if (unlikely(!inode)) {
+ pr_err("out of free dentries, can not create automount '%s'\n",
+ name);
return failed_creating(dentry);
+ }
make_empty_dir_inode(inode);
inode->i_flags |= S_AUTOMOUNT;
@@ -606,6 +626,8 @@ struct dentry *debugfs_create_symlink(const char *name, struct dentry *parent,
inode = debugfs_get_inode(dentry->d_sb);
if (unlikely(!inode)) {
+ pr_err("out of free dentries, can not create symlink '%s'\n",
+ name);
kfree(link);
return failed_creating(dentry);
}
@@ -617,13 +639,10 @@ struct dentry *debugfs_create_symlink(const char *name, struct dentry *parent,
}
EXPORT_SYMBOL_GPL(debugfs_create_symlink);
-static void __debugfs_remove_file(struct dentry *dentry, struct dentry *parent)
+static void __debugfs_file_removed(struct dentry *dentry)
{
struct debugfs_fsdata *fsd;
- simple_unlink(d_inode(parent), dentry);
- d_delete(dentry);
-
/*
* Paired with the closing smp_mb() implied by a successful
* cmpxchg() in debugfs_file_get(): either
@@ -644,16 +663,18 @@ static int __debugfs_remove(struct dentry *dentry, struct dentry *parent)
if (simple_positive(dentry)) {
dget(dentry);
- if (!d_is_reg(dentry)) {
- if (d_is_dir(dentry))
- ret = simple_rmdir(d_inode(parent), dentry);
- else
- simple_unlink(d_inode(parent), dentry);
+ if (d_is_dir(dentry)) {
+ ret = simple_rmdir(d_inode(parent), dentry);
if (!ret)
- d_delete(dentry);
+ fsnotify_rmdir(d_inode(parent), dentry);
} else {
- __debugfs_remove_file(dentry, parent);
+ simple_unlink(d_inode(parent), dentry);
+ fsnotify_unlink(d_inode(parent), dentry);
}
+ if (!ret)
+ d_delete(dentry);
+ if (d_is_reg(dentry))
+ __debugfs_file_removed(dentry);
dput(dentry);
}
return ret;