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Commit 479c427d authored by Steven Whitehouse's avatar Steven Whitehouse
Browse files

GFS2: Clean up ACLs 



To prepare for support for caching of ACLs, this cleans up the GFS2
ACL support by pushing the xattr code back into xattr.c and changing
the acl_get function into one which only returns ACLs so that we
can drop the caching function into it shortly.

Signed-off-by: default avatarSteven Whitehouse <swhiteho@redhat.com>
parent 69dca424

fs/gfs2/acl.c

+83 −81
Original line number Diff line number Diff line
@@ -27,53 +27,40 @@ 
#include "trans.h"

#include "util.h"



static int acl_get(struct gfs2_inode *ip, const char *name,

		   struct posix_acl **acl, struct gfs2_ea_location *el,

		   char **datap, unsigned int *lenp)

static const char *gfs2_acl_name(int type)

{

	char *data;

	unsigned int len;

	int error;

	switch (type) {

	case ACL_TYPE_ACCESS:

		return GFS2_POSIX_ACL_ACCESS;

	case ACL_TYPE_DEFAULT:

		return GFS2_POSIX_ACL_DEFAULT;

	}

	return NULL;

}



	el->el_bh = NULL;

static struct posix_acl *gfs2_acl_get(struct gfs2_inode *ip, int type)

{

	struct posix_acl *acl;

	const char *name;

	char *data;

	int len;



	if (!ip->i_eattr)

		return 0;



	error = gfs2_ea_find(ip, GFS2_EATYPE_SYS, name, el);

	if (error)

		return error;

	if (!el->el_ea)

		return 0;

	if (!GFS2_EA_DATA_LEN(el->el_ea))

		goto out;



	len = GFS2_EA_DATA_LEN(el->el_ea);

	data = kmalloc(len, GFP_NOFS);

	error = -ENOMEM;

	if (!data)

		goto out;

		return NULL;



	error = gfs2_ea_get_copy(ip, el, data, len);

	if (error < 0)

		goto out_kfree;

	error = 0;

	name = gfs2_acl_name(type);

	if (name == NULL)

		return ERR_PTR(-EINVAL);



	if (acl) {

		*acl = posix_acl_from_xattr(data, len);

		if (IS_ERR(*acl))

			error = PTR_ERR(*acl);

	}

	len = gfs2_xattr_acl_get(ip, name, &data);

	if (len < 0)

		return ERR_PTR(len);

	if (len == 0)

		return NULL;



out_kfree:

	if (error || !datap) {

	acl = posix_acl_from_xattr(data, len);

	kfree(data);

	} else {

		*datap = data;

		*lenp = len;

	}

out:

	return error;

	return acl;

}



/**
@@ -86,14 +73,12 @@ static int acl_get(struct gfs2_inode *ip, const char *name, 


int gfs2_check_acl(struct inode *inode, int mask)

{

	struct gfs2_ea_location el;

	struct posix_acl *acl = NULL;

	struct posix_acl *acl;

	int error;



	error = acl_get(GFS2_I(inode), GFS2_POSIX_ACL_ACCESS, &acl, &el, NULL, NULL);

	brelse(el.el_bh);

	if (error)

		return error;

	acl = gfs2_acl_get(GFS2_I(inode), ACL_TYPE_ACCESS);

	if (IS_ERR(acl))

		return PTR_ERR(acl);



	if (acl) {

		error = posix_acl_permission(inode, acl, mask);
@@ -120,32 +105,57 @@ static int gfs2_set_mode(struct inode *inode, mode_t mode) 
	return error;

}



int gfs2_acl_create(struct gfs2_inode *dip, struct gfs2_inode *ip)

static int gfs2_acl_set(struct inode *inode, int type, struct posix_acl *acl)

{

	struct gfs2_ea_location el;

	struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);

	struct posix_acl *acl = NULL, *clone;

	mode_t mode = ip->i_inode.i_mode;

	char *data = NULL;

	unsigned int len;

	int error;

	int len;

	char *data;

	const char *name = gfs2_acl_name(type);



	BUG_ON(name == NULL);

	len = posix_acl_to_xattr(acl, NULL, 0);

	if (len == 0)

		return 0;

	data = kmalloc(len, GFP_NOFS);

	if (data == NULL)

		return -ENOMEM;

	error = posix_acl_to_xattr(acl, data, len);

	if (error < 0)

		goto out;

	error = gfs2_xattr_set(inode, GFS2_EATYPE_SYS, name, data, len, 0);

out:

	kfree(data);

	return error;

}



int gfs2_acl_create(struct gfs2_inode *dip, struct inode *inode)

{

	struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);

	struct posix_acl *acl, *clone;

	mode_t mode = inode->i_mode;

	int error = 0;



	if (!sdp->sd_args.ar_posix_acl)

		return 0;

	if (S_ISLNK(ip->i_inode.i_mode))

	if (S_ISLNK(inode->i_mode))

		return 0;



	error = acl_get(dip, GFS2_POSIX_ACL_DEFAULT, &acl, &el, &data, &len);

	brelse(el.el_bh);

	if (error)

		return error;

	acl = gfs2_acl_get(dip, ACL_TYPE_DEFAULT);

	if (IS_ERR(acl))

		return PTR_ERR(acl);

	if (!acl) {

		mode &= ~current_umask();

		if (mode != ip->i_inode.i_mode)

			error = gfs2_set_mode(&ip->i_inode, mode);

		if (mode != inode->i_mode)

			error = gfs2_set_mode(inode, mode);

		return error;

	}



	if (S_ISDIR(inode->i_mode)) {

		error = gfs2_acl_set(inode, ACL_TYPE_DEFAULT, acl);

		if (error)

			goto out;

	}



	clone = posix_acl_clone(acl, GFP_NOFS);

	error = -ENOMEM;

	if (!clone)
@@ -153,43 +163,32 @@ int gfs2_acl_create(struct gfs2_inode *dip, struct gfs2_inode *ip) 
	posix_acl_release(acl);

	acl = clone;



	if (S_ISDIR(ip->i_inode.i_mode)) {

		error = gfs2_xattr_set(&ip->i_inode, GFS2_EATYPE_SYS,

				       GFS2_POSIX_ACL_DEFAULT, data, len, 0);

		if (error)

			goto out;

	}



	error = posix_acl_create_masq(acl, &mode);

	if (error < 0)

		goto out;

	if (error == 0)

		goto munge;



	posix_acl_to_xattr(acl, data, len);

	error = gfs2_xattr_set(&ip->i_inode, GFS2_EATYPE_SYS,

			       GFS2_POSIX_ACL_ACCESS, data, len, 0);

	error = gfs2_acl_set(inode, ACL_TYPE_ACCESS, acl);

	if (error)

		goto out;

munge:

	error = gfs2_set_mode(&ip->i_inode, mode);

	error = gfs2_set_mode(inode, mode);

out:

	posix_acl_release(acl);

	kfree(data);

	return error;

}



int gfs2_acl_chmod(struct gfs2_inode *ip, struct iattr *attr)

{

	struct posix_acl *acl = NULL, *clone;

	struct gfs2_ea_location el;

	struct posix_acl *acl, *clone;

	char *data;

	unsigned int len;

	int error;



	error = acl_get(ip, GFS2_POSIX_ACL_ACCESS, &acl, &el, &data, &len);

	if (error)

		goto out_brelse;

	acl = gfs2_acl_get(ip, ACL_TYPE_ACCESS);

	if (IS_ERR(acl))

		return PTR_ERR(acl);

	if (!acl)

		return gfs2_setattr_simple(ip, attr);
@@ -202,15 +201,18 @@ int gfs2_acl_chmod(struct gfs2_inode *ip, struct iattr *attr) 


	error = posix_acl_chmod_masq(acl, attr->ia_mode);

	if (!error) {

		len = posix_acl_to_xattr(acl, NULL, 0);

		data = kmalloc(len, GFP_NOFS);

		error = -ENOMEM;

		if (data == NULL)

			goto out;

		posix_acl_to_xattr(acl, data, len);

		error = gfs2_ea_acl_chmod(ip, &el, attr, data);

		error = gfs2_xattr_acl_chmod(ip, attr, data);

		kfree(data);

	}



out:

	posix_acl_release(acl);

	kfree(data);

out_brelse:

	brelse(el.el_bh);

	return error;

}

fs/gfs2/acl.h

+1 −1
Original line number Diff line number Diff line
@@ -17,7 +17,7 @@ 
#define GFS2_ACL_MAX_ENTRIES		25



extern int gfs2_check_acl(struct inode *inode, int mask);

extern int gfs2_acl_create(struct gfs2_inode *dip, struct gfs2_inode *ip);

extern int gfs2_acl_create(struct gfs2_inode *dip, struct inode *inode);

extern int gfs2_acl_chmod(struct gfs2_inode *ip, struct iattr *attr);

extern struct xattr_handler gfs2_xattr_system_handler;

fs/gfs2/inode.c

+1 −1
Original line number Diff line number Diff line
@@ -871,7 +871,7 @@ struct inode *gfs2_createi(struct gfs2_holder *ghs, const struct qstr *name, 
	if (error)

		goto fail_gunlock2;



	error = gfs2_acl_create(dip, GFS2_I(inode));

	error = gfs2_acl_create(dip, inode);

	if (error)

		goto fail_gunlock2;

fs/gfs2/xattr.c

+45 −11
Original line number Diff line number Diff line
@@ -186,7 +186,7 @@ static int ea_find_i(struct gfs2_inode *ip, struct buffer_head *bh, 
	return 0;

}



int gfs2_ea_find(struct gfs2_inode *ip, int type, const char *name,

static int gfs2_ea_find(struct gfs2_inode *ip, int type, const char *name,

			struct gfs2_ea_location *el)

{

	struct ea_find ef;
@@ -516,7 +516,7 @@ static int ea_get_unstuffed(struct gfs2_inode *ip, struct gfs2_ea_header *ea, 
	return error;

}



int gfs2_ea_get_copy(struct gfs2_inode *ip, struct gfs2_ea_location *el,

static int gfs2_ea_get_copy(struct gfs2_inode *ip, struct gfs2_ea_location *el,

			    char *data, size_t size)

{

	int ret;
@@ -534,6 +534,36 @@ int gfs2_ea_get_copy(struct gfs2_inode *ip, struct gfs2_ea_location *el, 
	return len;

}



int gfs2_xattr_acl_get(struct gfs2_inode *ip, const char *name, char **ppdata)

{

	struct gfs2_ea_location el;

	int error;

	int len;

	char *data;



	error = gfs2_ea_find(ip, GFS2_EATYPE_SYS, name, &el);

	if (error)

		return error;

	if (!el.el_ea)

		goto out;

	if (!GFS2_EA_DATA_LEN(el.el_ea))

		goto out;



	len = GFS2_EA_DATA_LEN(el.el_ea);

	data = kmalloc(len, GFP_NOFS);

	error = -ENOMEM;

	if (data == NULL)

		goto out;



	error = gfs2_ea_get_copy(ip, &el, data, len);

	if (error == 0)

		error = len;

	*ppdata = data;

out:

	brelse(el.el_bh);

	return error;

}



/**

 * gfs2_xattr_get - Get a GFS2 extended attribute

 * @inode: The inode
@@ -1259,22 +1289,26 @@ static int ea_acl_chmod_unstuffed(struct gfs2_inode *ip, 
	return error;

}



int gfs2_ea_acl_chmod(struct gfs2_inode *ip, struct gfs2_ea_location *el,

		      struct iattr *attr, char *data)

int gfs2_xattr_acl_chmod(struct gfs2_inode *ip, struct iattr *attr, char *data)

{

	struct gfs2_ea_location el;

	struct buffer_head *dibh;

	int error;



	if (GFS2_EA_IS_STUFFED(el->el_ea)) {

	error = gfs2_ea_find(ip, GFS2_EATYPE_SYS, GFS2_POSIX_ACL_ACCESS, &el);

	if (error)

		return error;



	if (GFS2_EA_IS_STUFFED(el.el_ea)) {

		error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + RES_EATTR, 0);

		if (error)

			return error;



		gfs2_trans_add_bh(ip->i_gl, el->el_bh, 1);

		memcpy(GFS2_EA2DATA(el->el_ea), data,

		       GFS2_EA_DATA_LEN(el->el_ea));

		gfs2_trans_add_bh(ip->i_gl, el.el_bh, 1);

		memcpy(GFS2_EA2DATA(el.el_ea), data,

		       GFS2_EA_DATA_LEN(el.el_ea));

	} else

		error = ea_acl_chmod_unstuffed(ip, el->el_ea, data);

		error = ea_acl_chmod_unstuffed(ip, el.el_ea, data);



	if (error)

		return error;

fs/gfs2/xattr.h

+2 −6
Original line number Diff line number Diff line
@@ -62,11 +62,7 @@ extern int gfs2_ea_dealloc(struct gfs2_inode *ip); 


/* Exported to acl.c */



extern int gfs2_ea_find(struct gfs2_inode *ip, int type, const char *name,

			struct gfs2_ea_location *el);

extern int gfs2_ea_get_copy(struct gfs2_inode *ip, struct gfs2_ea_location *el,

			    char *data, size_t size);

extern int gfs2_ea_acl_chmod(struct gfs2_inode *ip, struct gfs2_ea_location *el,

			     struct iattr *attr, char *data);

extern int gfs2_xattr_acl_get(struct gfs2_inode *ip, const char *name, char **data);

extern int gfs2_xattr_acl_chmod(struct gfs2_inode *ip, struct iattr *attr, char *data);



#endif /* __EATTR_DOT_H__ */