Commit 6674ecab authored by Russell King's avatar Russell King Committed by Al Viro
Browse files

fs/adfs: bigdir: extract directory validation 



Extract the directory validation from the directory reading function as
we will want to re-use this code.

Signed-off-by: default avatarRussell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent 0db35a02

fs/adfs/dir_fplus.c

+31 −10
Original line number Diff line number Diff line
@@ -16,6 +16,30 @@ static unsigned int adfs_fplus_offset(const struct adfs_bigdirheader *h, 
	       pos * sizeof(struct adfs_bigdirentry);

}



static int adfs_fplus_validate_header(const struct adfs_bigdirheader *h)

{

	unsigned int size = le32_to_cpu(h->bigdirsize);



	if (h->bigdirversion[0] != 0 || h->bigdirversion[1] != 0 ||

	    h->bigdirversion[2] != 0 ||

	    h->bigdirstartname != cpu_to_le32(BIGDIRSTARTNAME) ||

	    size & 2047)

		return -EIO;



	return 0;

}



static int adfs_fplus_validate_tail(const struct adfs_bigdirheader *h,

				    const struct adfs_bigdirtail *t)

{

	if (t->bigdirendname != cpu_to_le32(BIGDIRENDNAME) ||

	    t->bigdirendmasseq != h->startmasseq ||

	    t->reserved[0] != 0 || t->reserved[1] != 0)

		return -EIO;



	return 0;

}



static int adfs_fplus_read(struct super_block *sb, u32 indaddr,

			   unsigned int size, struct adfs_dir *dir)

{
@@ -30,6 +54,11 @@ static int adfs_fplus_read(struct super_block *sb, u32 indaddr, 
		return ret;



	dir->bighead = h = (void *)dir->bhs[0]->b_data;

	if (adfs_fplus_validate_header(h)) {

		adfs_error(sb, "dir %06x has malformed header", indaddr);

		goto out;

	}



	dirsize = le32_to_cpu(h->bigdirsize);

	if (dirsize != size) {

		adfs_msg(sb, KERN_WARNING,
@@ -37,13 +66,6 @@ static int adfs_fplus_read(struct super_block *sb, u32 indaddr, 
			 indaddr, dirsize, size);

	}



	if (h->bigdirversion[0] != 0 || h->bigdirversion[1] != 0 ||

	    h->bigdirversion[2] != 0 || size & 2047 ||

	    h->bigdirstartname != cpu_to_le32(BIGDIRSTARTNAME)) {

		adfs_error(sb, "dir %06x has malformed header", indaddr);

		goto out;

	}



	/* Read remaining buffers */

	ret = adfs_dir_read_buffers(sb, indaddr, dirsize, dir);

	if (ret)
@@ -52,9 +74,8 @@ static int adfs_fplus_read(struct super_block *sb, u32 indaddr, 
	dir->bigtail = t = (struct adfs_bigdirtail *)

		(dir->bhs[dir->nr_buffers - 1]->b_data + (sb->s_blocksize - 8));



	if (t->bigdirendname != cpu_to_le32(BIGDIRENDNAME) ||

	    t->bigdirendmasseq != h->startmasseq ||

	    t->reserved[0] != 0 || t->reserved[1] != 0) {

	ret = adfs_fplus_validate_tail(h, t);

	if (ret) {

		adfs_error(sb, "dir %06x has malformed tail", indaddr);

		goto out;

	}

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