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Commit 61172eae authored by Christoph Hellwig's avatar Christoph Hellwig
Browse files

proc: simplify proc_register calling conventions 



Return registered entry on success, return NULL on failure and free the
passed in entry.  Also expose it in internal.h as we'll start using it
in proc_net.c soon.

Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
parent 04015e3f

fs/proc/generic.c

+18 −26
Original line number Diff line number Diff line
@@ -346,13 +346,12 @@ static const struct inode_operations proc_dir_inode_operations = { 
	.setattr	= proc_notify_change,

};



static int proc_register(struct proc_dir_entry * dir, struct proc_dir_entry * dp)

/* returns the registered entry, or frees dp and returns NULL on failure */

struct proc_dir_entry *proc_register(struct proc_dir_entry *dir,

		struct proc_dir_entry *dp)

{

	int ret;



	ret = proc_alloc_inum(&dp->low_ino);

	if (ret)

		return ret;

	if (proc_alloc_inum(&dp->low_ino))

		goto out_free_entry;



	write_lock(&proc_subdir_lock);

	dp->parent = dir;
@@ -360,12 +359,16 @@ static int proc_register(struct proc_dir_entry * dir, struct proc_dir_entry * dp 
		WARN(1, "proc_dir_entry '%s/%s' already registered\n",

		     dir->name, dp->name);

		write_unlock(&proc_subdir_lock);

		proc_free_inum(dp->low_ino);

		return -EEXIST;

		goto out_free_inum;

	}

	write_unlock(&proc_subdir_lock);



	return 0;

	return dp;

out_free_inum:

	proc_free_inum(dp->low_ino);

out_free_entry:

	pde_free(dp);

	return NULL;

}



static struct proc_dir_entry *__proc_create(struct proc_dir_entry **parent,
@@ -443,10 +446,7 @@ struct proc_dir_entry *proc_symlink(const char *name, 
		if (ent->data) {

			strcpy((char*)ent->data,dest);

			ent->proc_iops = &proc_link_inode_operations;

			if (proc_register(parent, ent) < 0) {

				pde_free(ent);

				ent = NULL;

			}

			ent = proc_register(parent, ent);

		} else {

			pde_free(ent);

			ent = NULL;
@@ -470,11 +470,9 @@ struct proc_dir_entry *proc_mkdir_data(const char *name, umode_t mode, 
		ent->proc_fops = &proc_dir_operations;

		ent->proc_iops = &proc_dir_inode_operations;

		parent->nlink++;

		if (proc_register(parent, ent) < 0) {

			pde_free(ent);

		ent = proc_register(parent, ent);

		if (!ent)

			parent->nlink--;

			ent = NULL;

		}

	}

	return ent;

}
@@ -505,11 +503,9 @@ struct proc_dir_entry *proc_create_mount_point(const char *name) 
		ent->proc_fops = NULL;

		ent->proc_iops = NULL;

		parent->nlink++;

		if (proc_register(parent, ent) < 0) {

			pde_free(ent);

		ent = proc_register(parent, ent);

		if (!ent)

			parent->nlink--;

			ent = NULL;

		}

	}

	return ent;

}
@@ -539,11 +535,7 @@ struct proc_dir_entry *proc_create_data(const char *name, umode_t mode, 
	pde->proc_fops = proc_fops;

	pde->data = data;

	pde->proc_iops = &proc_file_inode_operations;

	if (proc_register(parent, pde) < 0)

		goto out_free;

	return pde;

out_free:

	pde_free(pde);

	return proc_register(parent, pde);

out:

	return NULL;

}

fs/proc/internal.h

+2 −0
Original line number Diff line number Diff line
@@ -162,6 +162,8 @@ extern bool proc_fill_cache(struct file *, struct dir_context *, const char *, i 
/*

 * generic.c

 */

struct proc_dir_entry *proc_register(struct proc_dir_entry *dir,

		struct proc_dir_entry *dp);

extern struct dentry *proc_lookup(struct inode *, struct dentry *, unsigned int);

struct dentry *proc_lookup_de(struct inode *, struct dentry *, struct proc_dir_entry *);

extern int proc_readdir(struct file *, struct dir_context *);