Commit 221e583a authored by Rasmus Rohde's avatar Rasmus Rohde Committed by Jan Kara
Browse files

udf: Make udf exportable 



Cc: Christoph Hellwig <hch@infradead.org>
Signed-off-by: default avatarRasmus Rohde <rohde@duff.dk>
Signed-off-by: default avatarJan Kara <jack@suse.cz>
parent 22ba0317

fs/udf/namei.c

+138 −2
Original line number Diff line number Diff line
@@ -32,6 +32,7 @@ 
#include <linux/buffer_head.h>

#include <linux/sched.h>

#include <linux/crc-itu-t.h>

#include <linux/exportfs.h>



static inline int udf_match(int len1, const char *name1, int len2,

			    const char *name2)
@@ -158,6 +159,8 @@ static struct fileIdentDesc *udf_find_entry(struct inode *dir, 
	sector_t offset;

	struct extent_position epos = {};

	struct udf_inode_info *dinfo = UDF_I(dir);

	int isdotdot = dentry->d_name.len == 2 &&

		dentry->d_name.name[0] == '.' && dentry->d_name.name[1] == '.';



	size = udf_ext0_offset(dir) + dir->i_size;

	f_pos = udf_ext0_offset(dir);
@@ -225,6 +228,12 @@ static struct fileIdentDesc *udf_find_entry(struct inode *dir, 
				continue;

		}



		if ((cfi->fileCharacteristics & FID_FILE_CHAR_PARENT) &&

		    isdotdot) {

			brelse(epos.bh);

			return fi;

		}



		if (!lfi)

			continue;
@@ -286,9 +295,8 @@ static struct dentry *udf_lookup(struct inode *dir, struct dentry *dentry, 
		}

	}

	unlock_kernel();

	d_add(dentry, inode);



	return NULL;

	return d_splice_alias(inode, dentry);

}



static struct fileIdentDesc *udf_add_entry(struct inode *dir,
@@ -1232,6 +1240,134 @@ static int udf_rename(struct inode *old_dir, struct dentry *old_dentry, 
	return retval;

}



static struct dentry *udf_get_parent(struct dentry *child)

{

	struct dentry *parent;

	struct inode *inode = NULL;

	struct dentry dotdot;

	struct fileIdentDesc cfi;

	struct udf_fileident_bh fibh;



	dotdot.d_name.name = "..";

	dotdot.d_name.len = 2;



	lock_kernel();

	if (!udf_find_entry(child->d_inode, &dotdot, &fibh, &cfi))

		goto out_unlock;



	if (fibh.sbh != fibh.ebh)

		brelse(fibh.ebh);

	brelse(fibh.sbh);



	inode = udf_iget(child->d_inode->i_sb,

			 lelb_to_cpu(cfi.icb.extLocation));

	if (!inode)

		goto out_unlock;

	unlock_kernel();



	parent = d_alloc_anon(inode);

	if (!parent) {

		iput(inode);

		parent = ERR_PTR(-ENOMEM);

	}



	return parent;

out_unlock:

	unlock_kernel();

	return ERR_PTR(-EACCES);

}





static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block,

					u16 partref, __u32 generation)

{

	struct inode *inode;

	struct dentry *result;

	kernel_lb_addr loc;



	if (block == 0)

		return ERR_PTR(-ESTALE);



	loc.logicalBlockNum = block;

	loc.partitionReferenceNum = partref;

	inode = udf_iget(sb, loc);



	if (inode == NULL)

		return ERR_PTR(-ENOMEM);



	if (generation && inode->i_generation != generation) {

		iput(inode);

		return ERR_PTR(-ESTALE);

	}

	result = d_alloc_anon(inode);

	if (!result) {

		iput(inode);

		return ERR_PTR(-ENOMEM);

	}

	return result;

}



static struct dentry *udf_fh_to_dentry(struct super_block *sb,

				       struct fid *fid, int fh_len, int fh_type)

{

	if ((fh_len != 3 && fh_len != 5) ||

	    (fh_type != FILEID_UDF_WITH_PARENT &&

	     fh_type != FILEID_UDF_WITHOUT_PARENT))

		return NULL;



	return udf_nfs_get_inode(sb, fid->udf.block, fid->udf.partref,

			fid->udf.generation);

}



static struct dentry *udf_fh_to_parent(struct super_block *sb,

				       struct fid *fid, int fh_len, int fh_type)

{

	if (fh_len != 5 || fh_type != FILEID_UDF_WITH_PARENT)

		return NULL;



	return udf_nfs_get_inode(sb, fid->udf.parent_block,

				 fid->udf.parent_partref,

				 fid->udf.parent_generation);

}

static int udf_encode_fh(struct dentry *de, __u32 *fh, int *lenp,

			 int connectable)

{

	int len = *lenp;

	struct inode *inode =  de->d_inode;

	kernel_lb_addr location = UDF_I(inode)->i_location;

	struct fid *fid = (struct fid *)fh;

	int type = FILEID_UDF_WITHOUT_PARENT;



	if (len < 3 || (connectable && len < 5))

		return 255;



	*lenp = 3;

	fid->udf.block = location.logicalBlockNum;

	fid->udf.partref = location.partitionReferenceNum;

	fid->udf.generation = inode->i_generation;



	if (connectable && !S_ISDIR(inode->i_mode)) {

		spin_lock(&de->d_lock);

		inode = de->d_parent->d_inode;

		location = UDF_I(inode)->i_location;

		fid->udf.parent_block = location.logicalBlockNum;

		fid->udf.parent_partref = location.partitionReferenceNum;

		fid->udf.parent_generation = inode->i_generation;

		spin_unlock(&de->d_lock);

		*lenp = 5;

		type = FILEID_UDF_WITH_PARENT;

	}



	return type;

}



const struct export_operations udf_export_ops = {

	.encode_fh	= udf_encode_fh,

	.fh_to_dentry   = udf_fh_to_dentry,

	.fh_to_parent   = udf_fh_to_parent,

	.get_parent     = udf_get_parent,

};



const struct inode_operations udf_dir_inode_operations = {

	.lookup				= udf_lookup,

	.create				= udf_create,

fs/udf/super.c

+1 −0
Original line number Diff line number Diff line
@@ -1933,6 +1933,7 @@ static int udf_fill_super(struct super_block *sb, void *options, int silent) 


	/* Fill in the rest of the superblock */

	sb->s_op = &udf_sb_ops;

	sb->s_export_op = &udf_export_ops;

	sb->dq_op = NULL;

	sb->s_dirt = 0;

	sb->s_magic = UDF_SUPER_MAGIC;

fs/udf/udfdecl.h

+1 −0
Original line number Diff line number Diff line
@@ -73,6 +73,7 @@ struct task_struct; 
struct buffer_head;

struct super_block;



extern const struct export_operations udf_export_ops;

extern const struct inode_operations udf_dir_inode_operations;

extern const struct file_operations udf_dir_operations;

extern const struct inode_operations udf_file_inode_operations;

include/linux/exportfs.h

+21 −0
Original line number Diff line number Diff line
@@ -33,6 +33,19 @@ enum fid_type { 
	 * 32 bit parent directory inode number.

	 */

	FILEID_INO32_GEN_PARENT = 2,



	/*

	 * 32 bit block number, 16 bit partition reference,

	 * 16 bit unused, 32 bit generation number.

	 */

	FILEID_UDF_WITHOUT_PARENT = 0x51,



	/*

	 * 32 bit block number, 16 bit partition reference,

	 * 16 bit unused, 32 bit generation number,

	 * 32 bit parent block number, 32 bit parent generation number

	 */

	FILEID_UDF_WITH_PARENT = 0x52,

};



struct fid {
@@ -43,6 +56,14 @@ struct fid { 
			u32 parent_ino;

			u32 parent_gen;

		} i32;

 		struct {

 			u32 block;

 			u16 partref;

 			u16 parent_partref;

 			u32 generation;

 			u32 parent_block;

 			u32 parent_generation;

 		} udf;

		__u32 raw[0];

	};

};