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debugfs: separate cache for debugfs inodes 

Embed them into container (struct debugfs_inode_info, with nothing
else in it at the moment), set the cache up, etc.

Just the infrastructure changes letting us augment debugfs inodes
here; adding stuff will come at the next step.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Reviewed-by: Christian Brauner <brauner@kernel.org>
Link: https://lore.kernel.org/r/20250112080705.141166-1-viro@zeniv.linux.org.uk
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
pull/1136/head
Al Viro 2025-01-12 08:06:45 +00:00 committed by Greg Kroah-Hartman
parent ee9c69388e
commit 268b36116f
2 changed files with 43 additions and 6 deletions
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38
fs/debugfs/inode.c
View File

@ -208,16 +208,34 @@ static int debugfs_show_options(struct seq_file *m, struct dentry *root)
return 0; return 0;
} }
static struct kmem_cache *debugfs_inode_cachep __ro_after_init;
static void init_once(void *foo)
{
struct debugfs_inode_info *info = foo;
inode_init_once(&info->vfs_inode);
}
static struct inode *debugfs_alloc_inode(struct super_block *sb)
{
struct debugfs_inode_info *info;
info = alloc_inode_sb(sb, debugfs_inode_cachep, GFP_KERNEL);
if (!info)
return NULL;
return &info->vfs_inode;
}
static void debugfs_free_inode(struct inode *inode) static void debugfs_free_inode(struct inode *inode)
{ {
if (S_ISLNK(inode->i_mode)) if (S_ISLNK(inode->i_mode))
kfree(inode->i_link); kfree(inode->i_link);
free_inode_nonrcu(inode); kmem_cache_free(debugfs_inode_cachep, DEBUGFS_I(inode));
} }
static const struct super_operations debugfs_super_operations = { static const struct super_operations debugfs_super_operations = {
.statfs = simple_statfs, .statfs = simple_statfs,
.show_options = debugfs_show_options, .show_options = debugfs_show_options,
.alloc_inode = debugfs_alloc_inode,
.free_inode = debugfs_free_inode, .free_inode = debugfs_free_inode,
}; };
@ -939,12 +957,22 @@ static int __init debugfs_init(void)
if (retval) if (retval)
return retval; return retval;
retval = register_filesystem(&debug_fs_type); debugfs_inode_cachep = kmem_cache_create("debugfs_inode_cache",
if (retval) sizeof(struct debugfs_inode_info), 0,
SLAB_RECLAIM_ACCOUNT | SLAB_ACCOUNT,
init_once);
if (debugfs_inode_cachep == NULL) {
sysfs_remove_mount_point(kernel_kobj, "debug"); sysfs_remove_mount_point(kernel_kobj, "debug");
else return -ENOMEM;
debugfs_registered = true; }
retval = register_filesystem(&debug_fs_type);
if (retval) { // Really not going to happen
sysfs_remove_mount_point(kernel_kobj, "debug");
kmem_cache_destroy(debugfs_inode_cachep);
return retval; return retval;
}
debugfs_registered = true;
return 0;
} }
core_initcall(debugfs_init); core_initcall(debugfs_init);

9
fs/debugfs/internal.h
View File

@ -11,6 +11,15 @@
struct file_operations; struct file_operations;
struct debugfs_inode_info {
struct inode vfs_inode;
};
static inline struct debugfs_inode_info *DEBUGFS_I(struct inode *inode)
{
return container_of(inode, struct debugfs_inode_info, vfs_inode);
}
/* declared over in file.c */ /* declared over in file.c */
extern const struct file_operations debugfs_noop_file_operations; extern const struct file_operations debugfs_noop_file_operations;
extern const struct file_operations debugfs_open_proxy_file_operations; extern const struct file_operations debugfs_open_proxy_file_operations;