Commit a317120b authored by Russell King's avatar Russell King Committed by Al Viro
Browse files

fs/adfs: dir: add generic copy functions 



Directories can span multiple buffers, and we currently open-code
memcpy access to these buffers, including dealing with entries that
are split across multiple buffers.  Such code exists in both
directory format implementations.

Provide common functions to allow data to be copied from/to the
directory buffers as if they were a contiguous set of buffers, and
use them when accessing directories.

Signed-off-by: default avatarRussell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent acf5f0be

fs/adfs/adfs.h

+4 −0
Original line number Diff line number Diff line
@@ -165,6 +165,10 @@ extern const struct dentry_operations adfs_dentry_operations; 
extern const struct adfs_dir_ops adfs_f_dir_ops;

extern const struct adfs_dir_ops adfs_fplus_dir_ops;



int adfs_dir_copyfrom(void *dst, struct adfs_dir *dir, unsigned int offset,

		      size_t len);

int adfs_dir_copyto(struct adfs_dir *dir, unsigned int offset, const void *src,

		    size_t len);

void adfs_dir_relse(struct adfs_dir *dir);

void adfs_object_fixup(struct adfs_dir *dir, struct object_info *obj);

extern int adfs_dir_update(struct super_block *sb, struct object_info *obj,

fs/adfs/dir.c

+50 −0
Original line number Diff line number Diff line
@@ -14,6 +14,56 @@ 
 */

static DEFINE_RWLOCK(adfs_dir_lock);



int adfs_dir_copyfrom(void *dst, struct adfs_dir *dir, unsigned int offset,

		      size_t len)

{

	struct super_block *sb = dir->sb;

	unsigned int index, remain;



	index = offset >> sb->s_blocksize_bits;

	offset &= sb->s_blocksize - 1;

	remain = sb->s_blocksize - offset;

	if (index + (remain < len) >= dir->nr_buffers)

		return -EINVAL;



	if (remain < len) {

		memcpy(dst, dir->bhs[index]->b_data + offset, remain);

		dst += remain;

		len -= remain;

		index += 1;

		offset = 0;

	}



	memcpy(dst, dir->bhs[index]->b_data + offset, len);



	return 0;

}



int adfs_dir_copyto(struct adfs_dir *dir, unsigned int offset, const void *src,

		    size_t len)

{

	struct super_block *sb = dir->sb;

	unsigned int index, remain;



	index = offset >> sb->s_blocksize_bits;

	offset &= sb->s_blocksize - 1;

	remain = sb->s_blocksize - offset;

	if (index + (remain < len) >= dir->nr_buffers)

		return -EINVAL;



	if (remain < len) {

		memcpy(dir->bhs[index]->b_data + offset, src, remain);

		src += remain;

		len -= remain;

		index += 1;

		offset = 0;

	}



	memcpy(dir->bhs[index]->b_data + offset, src, len);



	return 0;

}



void adfs_dir_relse(struct adfs_dir *dir)

{

	unsigned int i;

fs/adfs/dir_f.c

+9 −47
Original line number Diff line number Diff line
@@ -224,24 +224,12 @@ adfs_obj2dir(struct adfs_direntry *de, struct object_info *obj) 
static int

__adfs_dir_get(struct adfs_dir *dir, int pos, struct object_info *obj)

{

	struct super_block *sb = dir->sb;

	struct adfs_direntry de;

	int thissize, buffer, offset;



	buffer = pos >> sb->s_blocksize_bits;



	if (buffer > dir->nr_buffers)

		return -EINVAL;



	offset = pos & (sb->s_blocksize - 1);

	thissize = sb->s_blocksize - offset;

	if (thissize > 26)

		thissize = 26;

	int ret;



	memcpy(&de, dir->bh[buffer]->b_data + offset, thissize);

	if (thissize != 26)

		memcpy(((char *)&de) + thissize, dir->bh[buffer + 1]->b_data,

		       26 - thissize);

	ret = adfs_dir_copyfrom(&de, dir, pos, 26);

	if (ret)

		return ret;



	if (!de.dirobname[0])

		return -ENOENT;
@@ -254,42 +242,16 @@ __adfs_dir_get(struct adfs_dir *dir, int pos, struct object_info *obj) 
static int

__adfs_dir_put(struct adfs_dir *dir, int pos, struct object_info *obj)

{

	struct super_block *sb = dir->sb;

	struct adfs_direntry de;

	int thissize, buffer, offset;



	buffer = pos >> sb->s_blocksize_bits;



	if (buffer > dir->nr_buffers)

		return -EINVAL;



	offset = pos & (sb->s_blocksize - 1);

	thissize = sb->s_blocksize - offset;

	if (thissize > 26)

		thissize = 26;

	int ret;



	/*

	 * Get the entry in total

	 */

	memcpy(&de, dir->bh[buffer]->b_data + offset, thissize);

	if (thissize != 26)

		memcpy(((char *)&de) + thissize, dir->bh[buffer + 1]->b_data,

		       26 - thissize);

	ret = adfs_dir_copyfrom(&de, dir, pos, 26);

	if (ret)

		return ret;



	/*

	 * update it

	 */

	adfs_obj2dir(&de, obj);



	/*

	 * Put the new entry back

	 */

	memcpy(dir->bh[buffer]->b_data + offset, &de, thissize);

	if (thissize != 26)

		memcpy(dir->bh[buffer + 1]->b_data, ((char *)&de) + thissize,

		       26 - thissize);



	return 0;

	return adfs_dir_copyto(dir, pos, &de, 26);

}



/*

fs/adfs/dir_fplus.c

+12 −35
Original line number Diff line number Diff line
@@ -112,34 +112,6 @@ adfs_fplus_setpos(struct adfs_dir *dir, unsigned int fpos) 
	return ret;

}



static void

dir_memcpy(struct adfs_dir *dir, unsigned int offset, void *to, int len)

{

	struct super_block *sb = dir->sb;

	unsigned int buffer, partial, remainder;



	buffer = offset >> sb->s_blocksize_bits;

	offset &= sb->s_blocksize - 1;



	partial = sb->s_blocksize - offset;



	if (partial >= len)

		memcpy(to, dir->bhs[buffer]->b_data + offset, len);

	else {

		char *c = (char *)to;



		remainder = len - partial;



		memcpy(c,

			dir->bhs[buffer]->b_data + offset,

			partial);



		memcpy(c + partial,

			dir->bhs[buffer + 1]->b_data,

			remainder);

	}

}



static int

adfs_fplus_getnext(struct adfs_dir *dir, struct object_info *obj)

{
@@ -147,16 +119,19 @@ adfs_fplus_getnext(struct adfs_dir *dir, struct object_info *obj) 
		(struct adfs_bigdirheader *) dir->bhs[0]->b_data;

	struct adfs_bigdirentry bde;

	unsigned int offset;

	int ret = -ENOENT;

	int ret;



	if (dir->pos >= le32_to_cpu(h->bigdirentries))

		goto out;

		return -ENOENT;



	offset = offsetof(struct adfs_bigdirheader, bigdirname);

	offset += ((le32_to_cpu(h->bigdirnamelen) + 4) & ~3);

	offset += dir->pos * sizeof(struct adfs_bigdirentry);



	dir_memcpy(dir, offset, &bde, sizeof(struct adfs_bigdirentry));

	ret = adfs_dir_copyfrom(&bde, dir, offset,

				sizeof(struct adfs_bigdirentry));

	if (ret)

		return ret;



	obj->loadaddr = le32_to_cpu(bde.bigdirload);

	obj->execaddr = le32_to_cpu(bde.bigdirexec);
@@ -170,13 +145,15 @@ adfs_fplus_getnext(struct adfs_dir *dir, struct object_info *obj) 
	offset += le32_to_cpu(h->bigdirentries) * sizeof(struct adfs_bigdirentry);

	offset += le32_to_cpu(bde.bigdirobnameptr);



	dir_memcpy(dir, offset, obj->name, obj->name_len);

	ret = adfs_dir_copyfrom(obj->name, dir, offset, obj->name_len);

	if (ret)

		return ret;



	adfs_object_fixup(dir, obj);



	dir->pos += 1;

	ret = 0;

out:

	return ret;



	return 0;

}



const struct adfs_dir_ops adfs_fplus_dir_ops = {

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