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Commit ed80fcfa authored by Aneesh Kumar K.V's avatar Aneesh Kumar K.V Committed by Eric Van Hensbergen
Browse files

fs/9p: Always ask new inode in create 



This make sure we don't end up reusing the unlinked inode object.
The ideal way is to use inode i_generation. But i_generation is
not available in userspace always.

Signed-off-by: default avatarAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: default avatarEric Van Hensbergen <ericvh@gmail.com>
parent 4d63055f

fs/9p/v9fs.h

+23 −4
Original line number Diff line number Diff line
@@ -153,13 +153,13 @@ extern void v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, 
			void *p);

extern struct inode *v9fs_inode_from_fid(struct v9fs_session_info *v9ses,

					 struct p9_fid *fid,

					 struct super_block *sb);

					 struct super_block *sb, int new);

extern const struct inode_operations v9fs_dir_inode_operations_dotl;

extern const struct inode_operations v9fs_file_inode_operations_dotl;

extern const struct inode_operations v9fs_symlink_inode_operations_dotl;

extern struct inode *v9fs_inode_from_fid_dotl(struct v9fs_session_info *v9ses,

					      struct p9_fid *fid,

					      struct super_block *sb);

					      struct super_block *sb, int new);



/* other default globals */

#define V9FS_PORT	564
@@ -201,8 +201,27 @@ v9fs_get_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid, 
			struct super_block *sb)

{

	if (v9fs_proto_dotl(v9ses))

		return v9fs_inode_from_fid_dotl(v9ses, fid, sb);

		return v9fs_inode_from_fid_dotl(v9ses, fid, sb, 0);

	else

		return v9fs_inode_from_fid(v9ses, fid, sb);

		return v9fs_inode_from_fid(v9ses, fid, sb, 0);

}



/**

 * v9fs_get_new_inode_from_fid - Helper routine to populate an inode by

 * issuing a attribute request

 * @v9ses: session information

 * @fid: fid to issue attribute request for

 * @sb: superblock on which to create inode

 *

 */

static inline struct inode *

v9fs_get_new_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid,

			    struct super_block *sb)

{

	if (v9fs_proto_dotl(v9ses))

		return v9fs_inode_from_fid_dotl(v9ses, fid, sb, 1);

	else

		return v9fs_inode_from_fid(v9ses, fid, sb, 1);

}



#endif

fs/9p/vfs_inode.c

+17 −5
Original line number Diff line number Diff line
@@ -454,6 +454,11 @@ static int v9fs_test_inode(struct inode *inode, void *data) 
	return 1;

}



static int v9fs_test_new_inode(struct inode *inode, void *data)

{

	return 0;

}



static int v9fs_set_inode(struct inode *inode,  void *data)

{

	struct v9fs_inode *v9inode = V9FS_I(inode);
@@ -465,15 +470,22 @@ static int v9fs_set_inode(struct inode *inode, void *data) 


static struct inode *v9fs_qid_iget(struct super_block *sb,

				   struct p9_qid *qid,

				   struct p9_wstat *st)

				   struct p9_wstat *st,

				   int new)

{

	int retval, umode;

	unsigned long i_ino;

	struct inode *inode;

	struct v9fs_session_info *v9ses = sb->s_fs_info;

	int (*test)(struct inode *, void *);



	if (new)

		test = v9fs_test_new_inode;

	else

		test = v9fs_test_inode;



	i_ino = v9fs_qid2ino(qid);

	inode = iget5_locked(sb, i_ino, v9fs_test_inode, v9fs_set_inode, st);

	inode = iget5_locked(sb, i_ino, test, v9fs_set_inode, st);

	if (!inode)

		return ERR_PTR(-ENOMEM);

	if (!(inode->i_state & I_NEW))
@@ -504,7 +516,7 @@ static struct inode *v9fs_qid_iget(struct super_block *sb, 


struct inode *

v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid,

		    struct super_block *sb)

		    struct super_block *sb, int new)

{

	struct p9_wstat *st;

	struct inode *inode = NULL;
@@ -513,7 +525,7 @@ v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid, 
	if (IS_ERR(st))

		return ERR_CAST(st);



	inode = v9fs_qid_iget(sb, &st->qid, st);

	inode = v9fs_qid_iget(sb, &st->qid, st, new);

	p9stat_free(st);

	kfree(st);

	return inode;
@@ -615,7 +627,7 @@ v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir, 
	}



	/* instantiate inode and assign the unopened fid to the dentry */

	inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb);

	inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);

	if (IS_ERR(inode)) {

		err = PTR_ERR(inode);

		P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", err);

fs/9p/vfs_inode_dotl.c

+21 −9
Original line number Diff line number Diff line
@@ -108,6 +108,12 @@ static int v9fs_test_inode_dotl(struct inode *inode, void *data) 
	return 1;

}



/* Always get a new inode */

static int v9fs_test_new_inode_dotl(struct inode *inode, void *data)

{

	return 0;

}



static int v9fs_set_inode_dotl(struct inode *inode,  void *data)

{

	struct v9fs_inode *v9inode = V9FS_I(inode);
@@ -121,16 +127,22 @@ static int v9fs_set_inode_dotl(struct inode *inode, void *data) 
static struct inode *v9fs_qid_iget_dotl(struct super_block *sb,

					struct p9_qid *qid,

					struct p9_fid *fid,

					struct p9_stat_dotl *st)

					struct p9_stat_dotl *st,

					int new)

{

	int retval;

	unsigned long i_ino;

	struct inode *inode;

	struct v9fs_session_info *v9ses = sb->s_fs_info;

	int (*test)(struct inode *, void *);



	if (new)

		test = v9fs_test_new_inode_dotl;

	else

		test = v9fs_test_inode_dotl;



	i_ino = v9fs_qid2ino(qid);

	inode = iget5_locked(sb, i_ino, v9fs_test_inode_dotl,

			     v9fs_set_inode_dotl, st);

	inode = iget5_locked(sb, i_ino, test, v9fs_set_inode_dotl, st);

	if (!inode)

		return ERR_PTR(-ENOMEM);

	if (!(inode->i_state & I_NEW))
@@ -164,7 +176,7 @@ static struct inode *v9fs_qid_iget_dotl(struct super_block *sb, 


struct inode *

v9fs_inode_from_fid_dotl(struct v9fs_session_info *v9ses, struct p9_fid *fid,

			 struct super_block *sb)

			 struct super_block *sb, int new)

{

	struct p9_stat_dotl *st;

	struct inode *inode = NULL;
@@ -173,7 +185,7 @@ v9fs_inode_from_fid_dotl(struct v9fs_session_info *v9ses, struct p9_fid *fid, 
	if (IS_ERR(st))

		return ERR_CAST(st);



	inode = v9fs_qid_iget_dotl(sb, &st->qid, fid, st);

	inode = v9fs_qid_iget_dotl(sb, &st->qid, fid, st, new);

	kfree(st);

	return inode;

}
@@ -263,7 +275,7 @@ v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, int omode, 
		fid = NULL;

		goto error;

	}

	inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb);

	inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);

	if (IS_ERR(inode)) {

		err = PTR_ERR(inode);

		P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", err);
@@ -383,7 +395,7 @@ static int v9fs_vfs_mkdir_dotl(struct inode *dir, 
			goto error;

		}



		inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb);

		inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);

		if (IS_ERR(inode)) {

			err = PTR_ERR(inode);

			P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n",
@@ -636,7 +648,7 @@ v9fs_vfs_symlink_dotl(struct inode *dir, struct dentry *dentry, 
		}



		/* instantiate inode and assign the unopened fid to dentry */

		inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb);

		inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);

		if (IS_ERR(inode)) {

			err = PTR_ERR(inode);

			P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n",
@@ -789,7 +801,7 @@ v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, int omode, 
			goto error;

		}



		inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb);

		inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);

		if (IS_ERR(inode)) {

			err = PTR_ERR(inode);

			P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n",