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[PATCH] knfsd: nfsd4: represent nfsv4 acl with array instead of linke…
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…d list

Simplify the memory management and code a bit by representing acls with an
array instead of a linked list.

Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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J. Bruce Fields authored and Linus Torvalds committed Feb 16, 2007
1 parent 575a629 commit 28e05dd
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Showing 4 changed files with 66 additions and 136 deletions.
147 changes: 39 additions & 108 deletions fs/nfsd/nfs4acl.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -128,74 +128,58 @@ struct ace_container {
};

static short ace2type(struct nfs4_ace *);
static int _posix_to_nfsv4_one(struct posix_acl *, struct nfs4_acl *, unsigned int);
int nfs4_acl_add_ace(struct nfs4_acl *, u32, u32, u32, int, uid_t);
static void _posix_to_nfsv4_one(struct posix_acl *, struct nfs4_acl *,
unsigned int);
void nfs4_acl_add_ace(struct nfs4_acl *, u32, u32, u32, int, uid_t);

struct nfs4_acl *
nfs4_acl_posix_to_nfsv4(struct posix_acl *pacl, struct posix_acl *dpacl,
unsigned int flags)
{
struct nfs4_acl *acl;
int error = -EINVAL;
int size = 0;

if ((pacl != NULL &&
(posix_acl_valid(pacl) < 0 || pacl->a_count == 0)) ||
(dpacl != NULL &&
(posix_acl_valid(dpacl) < 0 || dpacl->a_count == 0)))
goto out_err;

acl = nfs4_acl_new();
if (acl == NULL) {
error = -ENOMEM;
goto out_err;
if (pacl) {
if (posix_acl_valid(pacl) < 0)
return ERR_PTR(-EINVAL);
size += 2*pacl->a_count;
}

if (pacl != NULL) {
error = _posix_to_nfsv4_one(pacl, acl,
flags & ~NFS4_ACL_TYPE_DEFAULT);
if (error < 0)
goto out_acl;
if (dpacl) {
if (posix_acl_valid(dpacl) < 0)
return ERR_PTR(-EINVAL);
size += 2*dpacl->a_count;
}

if (dpacl != NULL) {
error = _posix_to_nfsv4_one(dpacl, acl,
flags | NFS4_ACL_TYPE_DEFAULT);
if (error < 0)
goto out_acl;
}
/* Allocate for worst case: one (deny, allow) pair each: */
acl = nfs4_acl_new(size);
if (acl == NULL)
return ERR_PTR(-ENOMEM);

return acl;
if (pacl)
_posix_to_nfsv4_one(pacl, acl, flags & ~NFS4_ACL_TYPE_DEFAULT);

out_acl:
nfs4_acl_free(acl);
out_err:
acl = ERR_PTR(error);
if (dpacl)
_posix_to_nfsv4_one(dpacl, acl, flags | NFS4_ACL_TYPE_DEFAULT);

return acl;
}

static int
static void
nfs4_acl_add_pair(struct nfs4_acl *acl, int eflag, u32 mask, int whotype,
uid_t owner, unsigned int flags)
{
int error;

error = nfs4_acl_add_ace(acl, NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE,
nfs4_acl_add_ace(acl, NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE,
eflag, mask, whotype, owner);
if (error < 0)
return error;
error = nfs4_acl_add_ace(acl, NFS4_ACE_ACCESS_DENIED_ACE_TYPE,
nfs4_acl_add_ace(acl, NFS4_ACE_ACCESS_DENIED_ACE_TYPE,
eflag, deny_mask(mask, flags), whotype, owner);
return error;
}

/* We assume the acl has been verified with posix_acl_valid. */
static int
static void
_posix_to_nfsv4_one(struct posix_acl *pacl, struct nfs4_acl *acl,
unsigned int flags)
{
struct posix_acl_entry *pa, *pe, *group_owner_entry;
int error = -EINVAL;
u32 mask, mask_mask;
int eflag = ((flags & NFS4_ACL_TYPE_DEFAULT) ?
NFS4_INHERITANCE_FLAGS : 0);
Expand All @@ -211,23 +195,16 @@ _posix_to_nfsv4_one(struct posix_acl *pacl, struct nfs4_acl *acl,
pa = pacl->a_entries;
BUG_ON(pa->e_tag != ACL_USER_OBJ);
mask = mask_from_posix(pa->e_perm, flags | NFS4_ACL_OWNER);
error = nfs4_acl_add_pair(acl, eflag, mask, NFS4_ACL_WHO_OWNER, 0, flags);
if (error < 0)
goto out;
nfs4_acl_add_pair(acl, eflag, mask, NFS4_ACL_WHO_OWNER, 0, flags);
pa++;

while (pa->e_tag == ACL_USER) {
mask = mask_from_posix(pa->e_perm, flags);
error = nfs4_acl_add_ace(acl, NFS4_ACE_ACCESS_DENIED_ACE_TYPE,
nfs4_acl_add_ace(acl, NFS4_ACE_ACCESS_DENIED_ACE_TYPE,
eflag, mask_mask, NFS4_ACL_WHO_NAMED, pa->e_id);
if (error < 0)
goto out;


error = nfs4_acl_add_pair(acl, eflag, mask,
nfs4_acl_add_pair(acl, eflag, mask,
NFS4_ACL_WHO_NAMED, pa->e_id, flags);
if (error < 0)
goto out;
pa++;
}

Expand All @@ -238,65 +215,49 @@ _posix_to_nfsv4_one(struct posix_acl *pacl, struct nfs4_acl *acl,

if (pacl->a_count > 3) {
BUG_ON(pa->e_tag != ACL_GROUP_OBJ);
error = nfs4_acl_add_ace(acl, NFS4_ACE_ACCESS_DENIED_ACE_TYPE,
nfs4_acl_add_ace(acl, NFS4_ACE_ACCESS_DENIED_ACE_TYPE,
NFS4_ACE_IDENTIFIER_GROUP | eflag, mask_mask,
NFS4_ACL_WHO_GROUP, 0);
if (error < 0)
goto out;
}
group_owner_entry = pa;
mask = mask_from_posix(pa->e_perm, flags);
error = nfs4_acl_add_ace(acl, NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE,
nfs4_acl_add_ace(acl, NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE,
NFS4_ACE_IDENTIFIER_GROUP | eflag, mask,
NFS4_ACL_WHO_GROUP, 0);
if (error < 0)
goto out;
pa++;

while (pa->e_tag == ACL_GROUP) {
mask = mask_from_posix(pa->e_perm, flags);
error = nfs4_acl_add_ace(acl, NFS4_ACE_ACCESS_DENIED_ACE_TYPE,
nfs4_acl_add_ace(acl, NFS4_ACE_ACCESS_DENIED_ACE_TYPE,
NFS4_ACE_IDENTIFIER_GROUP | eflag, mask_mask,
NFS4_ACL_WHO_NAMED, pa->e_id);
if (error < 0)
goto out;

error = nfs4_acl_add_ace(acl, NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE,
nfs4_acl_add_ace(acl, NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE,
NFS4_ACE_IDENTIFIER_GROUP | eflag, mask,
NFS4_ACL_WHO_NAMED, pa->e_id);
if (error < 0)
goto out;
pa++;
}

/* deny ACEs */

pa = group_owner_entry;
mask = mask_from_posix(pa->e_perm, flags);
error = nfs4_acl_add_ace(acl, NFS4_ACE_ACCESS_DENIED_ACE_TYPE,
nfs4_acl_add_ace(acl, NFS4_ACE_ACCESS_DENIED_ACE_TYPE,
NFS4_ACE_IDENTIFIER_GROUP | eflag,
deny_mask(mask, flags), NFS4_ACL_WHO_GROUP, 0);
if (error < 0)
goto out;
pa++;
while (pa->e_tag == ACL_GROUP) {
mask = mask_from_posix(pa->e_perm, flags);
error = nfs4_acl_add_ace(acl, NFS4_ACE_ACCESS_DENIED_ACE_TYPE,
nfs4_acl_add_ace(acl, NFS4_ACE_ACCESS_DENIED_ACE_TYPE,
NFS4_ACE_IDENTIFIER_GROUP | eflag,
deny_mask(mask, flags), NFS4_ACL_WHO_NAMED, pa->e_id);
if (error < 0)
goto out;
pa++;
}

if (pa->e_tag == ACL_MASK)
pa++;
BUG_ON(pa->e_tag != ACL_OTHER);
mask = mask_from_posix(pa->e_perm, flags);
error = nfs4_acl_add_pair(acl, eflag, mask, NFS4_ACL_WHO_EVERYONE, 0, flags);

out:
return error;
nfs4_acl_add_pair(acl, eflag, mask, NFS4_ACL_WHO_EVERYONE, 0, flags);
}

static void
Expand Down Expand Up @@ -640,7 +601,7 @@ int nfs4_acl_nfsv4_to_posix(struct nfs4_acl *acl, struct posix_acl **pacl,
if (ret)
goto out_estate;
ret = -EINVAL;
list_for_each_entry(ace, &acl->ace_head, l_ace) {
for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
if (ace->type != NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE &&
ace->type != NFS4_ACE_ACCESS_DENIED_ACE_TYPE)
goto out_dstate;
Expand Down Expand Up @@ -705,59 +666,30 @@ EXPORT_SYMBOL(nfs4_acl_posix_to_nfsv4);
EXPORT_SYMBOL(nfs4_acl_nfsv4_to_posix);

struct nfs4_acl *
nfs4_acl_new(void)
nfs4_acl_new(int n)
{
struct nfs4_acl *acl;

if ((acl = kmalloc(sizeof(*acl), GFP_KERNEL)) == NULL)
acl = kmalloc(sizeof(*acl) + n*sizeof(struct nfs4_ace), GFP_KERNEL);
if (acl == NULL)
return NULL;

acl->naces = 0;
INIT_LIST_HEAD(&acl->ace_head);

return acl;
}

void
nfs4_acl_free(struct nfs4_acl *acl)
{
struct list_head *h;
struct nfs4_ace *ace;

if (!acl)
return;

while (!list_empty(&acl->ace_head)) {
h = acl->ace_head.next;
list_del(h);
ace = list_entry(h, struct nfs4_ace, l_ace);
kfree(ace);
}

kfree(acl);

return;
}

int
nfs4_acl_add_ace(struct nfs4_acl *acl, u32 type, u32 flag, u32 access_mask,
int whotype, uid_t who)
{
struct nfs4_ace *ace;

if ((ace = kmalloc(sizeof(*ace), GFP_KERNEL)) == NULL)
return -ENOMEM;
struct nfs4_ace *ace = acl->aces + acl->naces;

ace->type = type;
ace->flag = flag;
ace->access_mask = access_mask;
ace->whotype = whotype;
ace->who = who;

list_add_tail(&ace->l_ace, &acl->ace_head);
acl->naces++;

return 0;
}

static struct {
Expand Down Expand Up @@ -811,7 +743,6 @@ nfs4_acl_write_who(int who, char *p)
}

EXPORT_SYMBOL(nfs4_acl_new);
EXPORT_SYMBOL(nfs4_acl_free);
EXPORT_SYMBOL(nfs4_acl_add_ace);
EXPORT_SYMBOL(nfs4_acl_get_whotype);
EXPORT_SYMBOL(nfs4_acl_write_who);
43 changes: 20 additions & 23 deletions fs/nfsd/nfs4xdr.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -273,42 +273,42 @@ nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval, struct iattr *ia
iattr->ia_valid |= ATTR_SIZE;
}
if (bmval[0] & FATTR4_WORD0_ACL) {
int nace, i;
struct nfs4_ace ace;
int nace;
struct nfs4_ace *ace;

READ_BUF(4); len += 4;
READ32(nace);

*acl = nfs4_acl_new();
if (nace > NFS4_ACL_MAX)
return nfserr_resource;

*acl = nfs4_acl_new(nace);
if (*acl == NULL) {
host_err = -ENOMEM;
goto out_nfserr;
}
defer_free(argp, (void (*)(const void *))nfs4_acl_free, *acl);
defer_free(argp, kfree, *acl);

for (i = 0; i < nace; i++) {
(*acl)->naces = nace;
for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
READ_BUF(16); len += 16;
READ32(ace.type);
READ32(ace.flag);
READ32(ace.access_mask);
READ32(ace->type);
READ32(ace->flag);
READ32(ace->access_mask);
READ32(dummy32);
READ_BUF(dummy32);
len += XDR_QUADLEN(dummy32) << 2;
READMEM(buf, dummy32);
ace.whotype = nfs4_acl_get_whotype(buf, dummy32);
ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
host_err = 0;
if (ace.whotype != NFS4_ACL_WHO_NAMED)
ace.who = 0;
else if (ace.flag & NFS4_ACE_IDENTIFIER_GROUP)
if (ace->whotype != NFS4_ACL_WHO_NAMED)
ace->who = 0;
else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
host_err = nfsd_map_name_to_gid(argp->rqstp,
buf, dummy32, &ace.who);
buf, dummy32, &ace->who);
else
host_err = nfsd_map_name_to_uid(argp->rqstp,
buf, dummy32, &ace.who);
if (host_err)
goto out_nfserr;
host_err = nfs4_acl_add_ace(*acl, ace.type, ace.flag,
ace.access_mask, ace.whotype, ace.who);
buf, dummy32, &ace->who);
if (host_err)
goto out_nfserr;
}
Expand Down Expand Up @@ -1596,7 +1596,6 @@ nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
}
if (bmval0 & FATTR4_WORD0_ACL) {
struct nfs4_ace *ace;
struct list_head *h;

if (acl == NULL) {
if ((buflen -= 4) < 0)
Expand All @@ -1609,9 +1608,7 @@ nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
goto out_resource;
WRITE32(acl->naces);

list_for_each(h, &acl->ace_head) {
ace = list_entry(h, struct nfs4_ace, l_ace);

for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
if ((buflen -= 4*3) < 0)
goto out_resource;
WRITE32(ace->type);
Expand Down Expand Up @@ -1821,7 +1818,7 @@ nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
status = nfs_ok;

out:
nfs4_acl_free(acl);
kfree(acl);
if (fhp == &tempfh)
fh_put(&tempfh);
return status;
Expand Down
3 changes: 1 addition & 2 deletions include/linux/nfs4.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -105,12 +105,11 @@ struct nfs4_ace {
uint32_t access_mask;
int whotype;
uid_t who;
struct list_head l_ace;
};

struct nfs4_acl {
uint32_t naces;
struct list_head ace_head;
struct nfs4_ace aces[0];
};

typedef struct { char data[NFS4_VERIFIER_SIZE]; } nfs4_verifier;
Expand Down
9 changes: 6 additions & 3 deletions include/linux/nfs4_acl.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -39,9 +39,12 @@

#include <linux/posix_acl.h>

struct nfs4_acl *nfs4_acl_new(void);
void nfs4_acl_free(struct nfs4_acl *);
int nfs4_acl_add_ace(struct nfs4_acl *, u32, u32, u32, int, uid_t);
/* Maximum ACL we'll accept from client; chosen (somewhat arbitrarily) to
* fit in a page: */
#define NFS4_ACL_MAX 170

struct nfs4_acl *nfs4_acl_new(int);
void nfs4_acl_add_ace(struct nfs4_acl *, u32, u32, u32, int, uid_t);
int nfs4_acl_get_whotype(char *, u32);
int nfs4_acl_write_who(int who, char *p);
int nfs4_acl_permission(struct nfs4_acl *acl, uid_t owner, gid_t group,
Expand Down

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