Commit 4688a066 authored by Arnd Bergmann's avatar Arnd Bergmann
Browse files

adfs: remove the big kernel lock 



According to Russell King, adfs was written to not require the big
kernel lock, and all inode updates are done under adfs_dir_lock.

All other metadata in adfs is read-only and does not require locking.
The use of the BKL is the result of various pushdowns from the VFS
operations.

Signed-off-by: default avatarArnd Bergmann <arnd@arndb.de>
Acked-by: default avatarRussell King <rmk@arm.linux.org.uk>
Cc: Stuart Swales <stuart.swales.croftnuisk@gmail.com>
parent f5412be5

fs/adfs/Kconfig

+0 −1
Original line number Diff line number Diff line 
config ADFS_FS

	tristate "ADFS file system support (EXPERIMENTAL)"

	depends on BLOCK && EXPERIMENTAL

	depends on BKL # need to fix

	help

	  The Acorn Disc Filing System is the standard file system of the

	  RiscOS operating system which runs on Acorn's ARM-based Risc PC

fs/adfs/dir.c

+0 −6
Original line number Diff line number Diff line
@@ -9,7 +9,6 @@ 
 *

 *  Common directory handling for ADFS

 */

#include <linux/smp_lock.h>

#include "adfs.h"



/*
@@ -27,8 +26,6 @@ adfs_readdir(struct file *filp, void *dirent, filldir_t filldir) 
	struct adfs_dir dir;

	int ret = 0;



	lock_kernel();	



	if (filp->f_pos >> 32)

		goto out;
@@ -70,7 +67,6 @@ free_out: 
	ops->free(&dir);



out:

	unlock_kernel();

	return ret;

}
@@ -276,7 +272,6 @@ adfs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd) 
	struct object_info obj;

	int error;



	lock_kernel();

	error = adfs_dir_lookup_byname(dir, &dentry->d_name, &obj);

	if (error == 0) {

		error = -EACCES;
@@ -288,7 +283,6 @@ adfs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd) 
		if (inode)

			error = 0;

	}

	unlock_kernel();

	d_add(dentry, inode);

	return ERR_PTR(error);

}

fs/adfs/inode.c

+0 −6
Original line number Diff line number Diff line
@@ -7,7 +7,6 @@ 
 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

 */

#include <linux/smp_lock.h>

#include <linux/buffer_head.h>

#include <linux/writeback.h>

#include "adfs.h"
@@ -316,8 +315,6 @@ adfs_notify_change(struct dentry *dentry, struct iattr *attr) 
	unsigned int ia_valid = attr->ia_valid;

	int error;

	

	lock_kernel();



	error = inode_change_ok(inode, attr);



	/*
@@ -359,7 +356,6 @@ adfs_notify_change(struct dentry *dentry, struct iattr *attr) 
	if (ia_valid & (ATTR_SIZE | ATTR_MTIME | ATTR_MODE))

		mark_inode_dirty(inode);

out:

	unlock_kernel();

	return error;

}
@@ -374,7 +370,6 @@ int adfs_write_inode(struct inode *inode, struct writeback_control *wbc) 
	struct object_info obj;

	int ret;



	lock_kernel();

	obj.file_id	= inode->i_ino;

	obj.name_len	= 0;

	obj.parent_id	= ADFS_I(inode)->parent_id;
@@ -384,6 +379,5 @@ int adfs_write_inode(struct inode *inode, struct writeback_control *wbc) 
	obj.size	= inode->i_size;



	ret = adfs_dir_update(sb, &obj, wbc->sync_mode == WB_SYNC_ALL);

	unlock_kernel();

	return ret;

}

fs/adfs/super.c

+1 −12
Original line number Diff line number Diff line
@@ -14,7 +14,6 @@ 
#include <linux/mount.h>

#include <linux/seq_file.h>

#include <linux/slab.h>

#include <linux/smp_lock.h>

#include <linux/statfs.h>

#include "adfs.h"

#include "dir_f.h"
@@ -120,15 +119,11 @@ static void adfs_put_super(struct super_block *sb) 
	int i;

	struct adfs_sb_info *asb = ADFS_SB(sb);



	lock_kernel();



	for (i = 0; i < asb->s_map_size; i++)

		brelse(asb->s_map[i].dm_bh);

	kfree(asb->s_map);

	kfree(asb);

	sb->s_fs_info = NULL;



	unlock_kernel();

}



static int adfs_show_options(struct seq_file *seq, struct vfsmount *mnt)
@@ -359,15 +354,11 @@ static int adfs_fill_super(struct super_block *sb, void *data, int silent) 
	struct adfs_sb_info *asb;

	struct inode *root;



	lock_kernel();



	sb->s_flags |= MS_NODIRATIME;



	asb = kzalloc(sizeof(*asb), GFP_KERNEL);

	if (!asb) {

		unlock_kernel();

	if (!asb)

		return -ENOMEM;

	}

	sb->s_fs_info = asb;



	/* set default options */
@@ -485,7 +476,6 @@ static int adfs_fill_super(struct super_block *sb, void *data, int silent) 
		adfs_error(sb, "get root inode failed\n");

		goto error;

	}

	unlock_kernel();

	return 0;



error_free_bh:
@@ -493,7 +483,6 @@ error_free_bh: 
error:

	sb->s_fs_info = NULL;

	kfree(asb);

	unlock_kernel();

	return -EINVAL;

}

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