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helpers for acl caching + switch to those

Browse source 
helpers: get_cached_acl(inode, type), set_cached_acl(inode, type, acl),
forget_cached_acl(inode, type).

ubifs/xattr.c needed includes reordered, the rest is a plain switchover.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2009-06-09 12:11:54 -04:00
parent 06b16e9f68
commit 073aaa1b14
10 changed files with 153 additions and 331 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

44
fs/btrfs/acl.c
View file

@ -29,51 +29,28 @@
#ifdef CONFIG_FS_POSIX_ACL
static void btrfs_update_cached_acl(struct inode *inode,
struct posix_acl **p_acl,
struct posix_acl *acl)
{
spin_lock(&inode->i_lock);
if (*p_acl && *p_acl != ACL_NOT_CACHED)
posix_acl_release(*p_acl);
*p_acl = posix_acl_dup(acl);
spin_unlock(&inode->i_lock);
}
static struct posix_acl *btrfs_get_acl(struct inode *inode, int type)
{
int size;
const char *name;
char *value = NULL;
struct posix_acl *acl = NULL, **p_acl;
struct posix_acl *acl;
acl = get_cached_acl(inode, type);
if (acl != ACL_NOT_CACHED)
return acl;
switch (type) {
case ACL_TYPE_ACCESS:
name = POSIX_ACL_XATTR_ACCESS;
p_acl = &inode->i_acl;
break;
case ACL_TYPE_DEFAULT:
name = POSIX_ACL_XATTR_DEFAULT;
p_acl = &inode->i_default_acl;
break;
default:
return ERR_PTR(-EINVAL);
BUG();
}
/* Handle the cached NULL acl case without locking */
acl = ACCESS_ONCE(*p_acl);
if (!acl)
return acl;
spin_lock(&inode->i_lock);
acl = *p_acl;
if (acl != ACL_NOT_CACHED)
acl = posix_acl_dup(acl);
spin_unlock(&inode->i_lock);
if (acl != ACL_NOT_CACHED)
return acl;
size = __btrfs_getxattr(inode, name, "", 0);
if (size > 0) {
value = kzalloc(size, GFP_NOFS);
@ -82,13 +59,13 @@ static struct posix_acl *btrfs_get_acl(struct inode *inode, int type)
size = __btrfs_getxattr(inode, name, value, size);
if (size > 0) {
acl = posix_acl_from_xattr(value, size);
btrfs_update_cached_acl(inode, p_acl, acl);
set_cached_acl(inode, type, acl);
}
kfree(value);
} else if (size == -ENOENT || size == -ENODATA || size == 0) {
/* FIXME, who returns -ENOENT? I think nobody */
acl = NULL;
btrfs_update_cached_acl(inode, p_acl, acl);
set_cached_acl(inode, type, acl);
} else {
acl = ERR_PTR(-EIO);
}
@ -121,7 +98,6 @@ static int btrfs_set_acl(struct inode *inode, struct posix_acl *acl, int type)
{
int ret, size = 0;
const char *name;
struct posix_acl **p_acl;
char *value = NULL;
mode_t mode;
@ -141,13 +117,11 @@ static int btrfs_set_acl(struct inode *inode, struct posix_acl *acl, int type)
ret = 0;
inode->i_mode = mode;
name = POSIX_ACL_XATTR_ACCESS;
p_acl = &inode->i_acl;
break;
case ACL_TYPE_DEFAULT:
if (!S_ISDIR(inode->i_mode))
return acl ? -EINVAL : 0;
name = POSIX_ACL_XATTR_DEFAULT;
p_acl = &inode->i_default_acl;
break;
default:
return -EINVAL;
@ -172,7 +146,7 @@ out:
kfree(value);
if (!ret)
btrfs_update_cached_acl(inode, p_acl, acl);
set_cached_acl(inode, type, acl);
return ret;
}

77
fs/ext2/acl.c
View file

@ -125,30 +125,6 @@ fail:
return ERR_PTR(-EINVAL);
}
static inline struct posix_acl *
ext2_iget_acl(struct inode *inode, struct posix_acl **i_acl)
{
struct posix_acl *acl = ACL_NOT_CACHED;
spin_lock(&inode->i_lock);
if (*i_acl != ACL_NOT_CACHED)
acl = posix_acl_dup(*i_acl);
spin_unlock(&inode->i_lock);
return acl;
}
static inline void
ext2_iset_acl(struct inode *inode, struct posix_acl **i_acl,
struct posix_acl *acl)
{
spin_lock(&inode->i_lock);
if (*i_acl != ACL_NOT_CACHED)
posix_acl_release(*i_acl);
*i_acl = posix_acl_dup(acl);
spin_unlock(&inode->i_lock);
}
/*
* inode->i_mutex: don't care
*/
@ -163,23 +139,19 @@ ext2_get_acl(struct inode *inode, int type)
if (!test_opt(inode->i_sb, POSIX_ACL))
return NULL;
switch(type) {
case ACL_TYPE_ACCESS:
acl = ext2_iget_acl(inode, &inode->i_acl);
if (acl != ACL_NOT_CACHED)
return acl;
name_index = EXT2_XATTR_INDEX_POSIX_ACL_ACCESS;
break;
acl = get_cached_acl(inode, type);
if (acl != ACL_NOT_CACHED)
return acl;
case ACL_TYPE_DEFAULT:
acl = ext2_iget_acl(inode, &inode->i_default_acl);
if (acl != ACL_NOT_CACHED)
return acl;
name_index = EXT2_XATTR_INDEX_POSIX_ACL_DEFAULT;
break;
default:
return ERR_PTR(-EINVAL);
switch (type) {
case ACL_TYPE_ACCESS:
name_index = EXT2_XATTR_INDEX_POSIX_ACL_ACCESS;
break;
case ACL_TYPE_DEFAULT:
name_index = EXT2_XATTR_INDEX_POSIX_ACL_DEFAULT;
break;
default:
BUG();
}
retval = ext2_xattr_get(inode, name_index, "", NULL, 0);
if (retval > 0) {
@ -196,17 +168,9 @@ ext2_get_acl(struct inode *inode, int type)
acl = ERR_PTR(retval);
kfree(value);
if (!IS_ERR(acl)) {
switch(type) {
case ACL_TYPE_ACCESS:
ext2_iset_acl(inode, &inode->i_acl, acl);
break;
if (!IS_ERR(acl))
set_cached_acl(inode, type, acl);
case ACL_TYPE_DEFAULT:
ext2_iset_acl(inode, &inode->i_default_acl, acl);
break;
}
}
return acl;
}
@ -261,17 +225,8 @@ ext2_set_acl(struct inode *inode, int type, struct posix_acl *acl)
error = ext2_xattr_set(inode, name_index, "", value, size, 0);
kfree(value);
if (!error) {
switch(type) {
case ACL_TYPE_ACCESS:
ext2_iset_acl(inode, &inode->i_acl, acl);
break;
case ACL_TYPE_DEFAULT:
ext2_iset_acl(inode, &inode->i_default_acl, acl);
break;
}
}
if (!error)
set_cached_acl(inode, type, acl);
return error;
}

81
fs/ext3/acl.c
View file

@ -126,33 +126,6 @@ fail:
return ERR_PTR(-EINVAL);
}
static inline struct posix_acl *
ext3_iget_acl(struct inode *inode, struct posix_acl **i_acl)
{
struct posix_acl *acl = ACCESS_ONCE(*i_acl);
if (acl) {
spin_lock(&inode->i_lock);
acl = *i_acl;
if (acl != ACL_NOT_CACHED)
acl = posix_acl_dup(acl);
spin_unlock(&inode->i_lock);
}
return acl;
}
static inline void
ext3_iset_acl(struct inode *inode, struct posix_acl **i_acl,
struct posix_acl *acl)
{
spin_lock(&inode->i_lock);
if (*i_acl != ACL_NOT_CACHED)
posix_acl_release(*i_acl);
*i_acl = posix_acl_dup(acl);
spin_unlock(&inode->i_lock);
}
/*
* Inode operation get_posix_acl().
*
@ -169,24 +142,21 @@ ext3_get_acl(struct inode *inode, int type)
if (!test_opt(inode->i_sb, POSIX_ACL))
return NULL;
switch(type) {
case ACL_TYPE_ACCESS:
acl = ext3_iget_acl(inode, &inode->i_acl);
if (acl != ACL_NOT_CACHED)
return acl;
name_index = EXT3_XATTR_INDEX_POSIX_ACL_ACCESS;
break;
acl = get_cached_acl(inode, type);
if (acl != ACL_NOT_CACHED)
return acl;
case ACL_TYPE_DEFAULT:
acl = ext3_iget_acl(inode, &inode->i_default_acl);
if (acl != ACL_NOT_CACHED)
return acl;
name_index = EXT3_XATTR_INDEX_POSIX_ACL_DEFAULT;
break;
default:
return ERR_PTR(-EINVAL);
switch (type) {
case ACL_TYPE_ACCESS:
name_index = EXT3_XATTR_INDEX_POSIX_ACL_ACCESS;
break;
case ACL_TYPE_DEFAULT:
name_index = EXT3_XATTR_INDEX_POSIX_ACL_DEFAULT;
break;
default:
BUG();
}
retval = ext3_xattr_get(inode, name_index, "", NULL, 0);
if (retval > 0) {
value = kmalloc(retval, GFP_NOFS);
@ -202,17 +172,9 @@ ext3_get_acl(struct inode *inode, int type)
acl = ERR_PTR(retval);
kfree(value);
if (!IS_ERR(acl)) {
switch(type) {
case ACL_TYPE_ACCESS:
ext3_iset_acl(inode, &inode->i_acl, acl);
break;
if (!IS_ERR(acl))
set_cached_acl(inode, type, acl);
case ACL_TYPE_DEFAULT:
ext3_iset_acl(inode, &inode->i_default_acl, acl);
break;
}
}
return acl;
}
@ -269,17 +231,10 @@ ext3_set_acl(handle_t *handle, struct inode *inode, int type,
value, size, 0);
kfree(value);
if (!error) {
switch(type) {
case ACL_TYPE_ACCESS:
ext3_iset_acl(inode, &inode->i_acl, acl);
break;
case ACL_TYPE_DEFAULT:
ext3_iset_acl(inode, &inode->i_default_acl, acl);
break;
}
}
if (!error)
set_cached_acl(inode, type, acl);
return error;
}

65
fs/ext4/acl.c
View file

@ -126,33 +126,6 @@ fail:
return ERR_PTR(-EINVAL);
}
static inline struct posix_acl *
ext4_iget_acl(struct inode *inode, struct posix_acl **i_acl)
{
struct posix_acl *acl = ACCESS_ONCE(*i_acl);
if (acl) {
spin_lock(&inode->i_lock);
acl = *i_acl;
if (acl != ACL_NOT_CACHED)
acl = posix_acl_dup(acl);
spin_unlock(&inode->i_lock);
}
return acl;
}
static inline void
ext4_iset_acl(struct inode *inode, struct posix_acl **i_acl,
struct posix_acl *acl)
{
spin_lock(&inode->i_lock);
if (*i_acl != ACL_NOT_CACHED)
posix_acl_release(*i_acl);
*i_acl = posix_acl_dup(acl);
spin_unlock(&inode->i_lock);
}
/*
* Inode operation get_posix_acl().
*
@ -169,23 +142,19 @@ ext4_get_acl(struct inode *inode, int type)
if (!test_opt(inode->i_sb, POSIX_ACL))
return NULL;
acl = get_cached_acl(inode, type);
if (acl != ACL_NOT_CACHED)
return acl;
switch (type) {
case ACL_TYPE_ACCESS:
acl = ext4_iget_acl(inode, &inode->i_acl);
if (acl != ACL_NOT_CACHED)
return acl;
name_index = EXT4_XATTR_INDEX_POSIX_ACL_ACCESS;
break;
case ACL_TYPE_DEFAULT:
acl = ext4_iget_acl(inode, &inode->i_default_acl);
if (acl != ACL_NOT_CACHED)
return acl;
name_index = EXT4_XATTR_INDEX_POSIX_ACL_DEFAULT;
break;
default:
return ERR_PTR(-EINVAL);
BUG();
}
retval = ext4_xattr_get(inode, name_index, "", NULL, 0);
if (retval > 0) {
@ -202,17 +171,9 @@ ext4_get_acl(struct inode *inode, int type)
acl = ERR_PTR(retval);
kfree(value);
if (!IS_ERR(acl)) {
switch (type) {
case ACL_TYPE_ACCESS:
ext4_iset_acl(inode, &inode->i_acl, acl);
break;
if (!IS_ERR(acl))
set_cached_acl(inode, type, acl);
case ACL_TYPE_DEFAULT:
ext4_iset_acl(inode, &inode->i_default_acl, acl);
break;
}
}
return acl;
}
@ -269,17 +230,9 @@ ext4_set_acl(handle_t *handle, struct inode *inode, int type,
value, size, 0);
kfree(value);
if (!error) {
switch (type) {
case ACL_TYPE_ACCESS:
ext4_iset_acl(inode, &inode->i_acl, acl);
break;
if (!error)
set_cached_acl(inode, type, acl);
case ACL_TYPE_DEFAULT:
ext4_iset_acl(inode, &inode->i_default_acl, acl);
break;
}
}
return error;
}

60
fs/jffs2/acl.c
View file

@ -156,47 +156,25 @@ static void *jffs2_acl_to_medium(const struct posix_acl *acl, size_t *size)
return ERR_PTR(-EINVAL);
}
static struct posix_acl *jffs2_iget_acl(struct inode *inode, struct posix_acl **i_acl)
{
struct posix_acl *acl = ACL_NOT_CACHED;
spin_lock(&inode->i_lock);
if (*i_acl != ACL_NOT_CACHED)
acl = posix_acl_dup(*i_acl);
spin_unlock(&inode->i_lock);
return acl;
}
static void jffs2_iset_acl(struct inode *inode, struct posix_acl **i_acl, struct posix_acl *acl)
{
spin_lock(&inode->i_lock);
if (*i_acl != ACL_NOT_CACHED)
posix_acl_release(*i_acl);
*i_acl = posix_acl_dup(acl);
spin_unlock(&inode->i_lock);
}
static struct posix_acl *jffs2_get_acl(struct inode *inode, int type)
{
struct posix_acl *acl;
char *value = NULL;
int rc, xprefix;
acl = get_cached_acl(inode, type);
if (acl != ACL_NOT_CACHED)
return acl;
switch (type) {
case ACL_TYPE_ACCESS:
acl = jffs2_iget_acl(inode, &inode->i_acl);
if (acl != ACL_NOT_CACHED)
return acl;
xprefix = JFFS2_XPREFIX_ACL_ACCESS;
break;
case ACL_TYPE_DEFAULT:
acl = jffs2_iget_acl(inode, &inode->i_default_acl);
if (acl != ACL_NOT_CACHED)
return acl;
xprefix = JFFS2_XPREFIX_ACL_DEFAULT;
break;
default:
return ERR_PTR(-EINVAL);
BUG();
}
rc = do_jffs2_getxattr(inode, xprefix, "", NULL, 0);
if (rc > 0) {
@ -214,16 +192,8 @@ static struct posix_acl *jffs2_get_acl(struct inode *inode, int type)
}
if (value)
kfree(value);
if (!IS_ERR(acl)) {
switch (type) {
case ACL_TYPE_ACCESS:
jffs2_iset_acl(inode, &inode->i_acl, acl);
break;
case ACL_TYPE_DEFAULT:
jffs2_iset_acl(inode, &inode->i_default_acl, acl);
break;
}
}
if (!IS_ERR(acl))
set_cached_acl(inode, type, acl);
return acl;
}
@ -283,16 +253,8 @@ static int jffs2_set_acl(struct inode *inode, int type, struct posix_acl *acl)
return -EINVAL;
}
rc = __jffs2_set_acl(inode, xprefix, acl);
if (!rc) {
switch(type) {
case ACL_TYPE_ACCESS:
jffs2_iset_acl(inode, &inode->i_acl, acl);
break;
case ACL_TYPE_DEFAULT:
jffs2_iset_acl(inode, &inode->i_default_acl, acl);
break;
}
}
if (!rc)
set_cached_acl(inode, type, acl);
return rc;
}
@ -336,7 +298,7 @@ int jffs2_init_acl_pre(struct inode *dir_i, struct inode *inode, int *i_mode)
*i_mode &= ~current_umask();
} else {
if (S_ISDIR(*i_mode))
jffs2_iset_acl(inode, &inode->i_default_acl, acl);
set_cached_acl(inode, ACL_TYPE_DEFAULT, acl);
clone = posix_acl_clone(acl, GFP_KERNEL);
if (!clone)
@ -347,7 +309,7 @@ int jffs2_init_acl_pre(struct inode *dir_i, struct inode *inode, int *i_mode)
return rc;
}
if (rc > 0)
jffs2_iset_acl(inode, &inode->i_acl, clone);
set_cached_acl(inode, ACL_TYPE_ACCESS, clone);
posix_acl_release(clone);
}

32
fs/jfs/acl.c
View file

@ -31,26 +31,24 @@ static struct posix_acl *jfs_get_acl(struct inode *inode, int type)
{
struct posix_acl *acl;
char *ea_name;
struct posix_acl **p_acl;
int size;
char *value = NULL;
acl = get_cached_acl(inode, type);
if (acl != ACL_NOT_CACHED)
return acl;
switch(type) {
case ACL_TYPE_ACCESS:
ea_name = POSIX_ACL_XATTR_ACCESS;
p_acl = &inode->i_acl;
break;
case ACL_TYPE_DEFAULT:
ea_name = POSIX_ACL_XATTR_DEFAULT;
p_acl = &inode->i_default_acl;
break;
default:
return ERR_PTR(-EINVAL);
}
if (*p_acl != ACL_NOT_CACHED)
return posix_acl_dup(*p_acl);
size = __jfs_getxattr(inode, ea_name, NULL, 0);
if (size > 0) {
@ -61,17 +59,18 @@ static struct posix_acl *jfs_get_acl(struct inode *inode, int type)
}
if (size < 0) {
if (size == -ENODATA) {
*p_acl = NULL;
if (size == -ENODATA)
acl = NULL;
} else
else
acl = ERR_PTR(size);
} else {
acl = posix_acl_from_xattr(value, size);
if (!IS_ERR(acl))
*p_acl = posix_acl_dup(acl);
}
kfree(value);
if (!IS_ERR(acl)) {
set_cached_acl(inode, type, acl);
posix_acl_release(acl);
}
return acl;
}
@ -79,7 +78,6 @@ static int jfs_set_acl(tid_t tid, struct inode *inode, int type,
struct posix_acl *acl)
{
char *ea_name;
struct posix_acl **p_acl;
int rc;
int size = 0;
char *value = NULL;
@ -90,11 +88,9 @@ static int jfs_set_acl(tid_t tid, struct inode *inode, int type,
switch(type) {
case ACL_TYPE_ACCESS:
ea_name = POSIX_ACL_XATTR_ACCESS;
p_acl = &inode->i_acl;
break;
case ACL_TYPE_DEFAULT:
ea_name = POSIX_ACL_XATTR_DEFAULT;
p_acl = &inode->i_default_acl;
if (!S_ISDIR(inode->i_mode))
return acl ? -EACCES : 0;
break;
@ -114,11 +110,9 @@ static int jfs_set_acl(tid_t tid, struct inode *inode, int type,
out:
kfree(value);
if (!rc) {
if (*p_acl && (*p_acl != ACL_NOT_CACHED))
posix_acl_release(*p_acl);
*p_acl = posix_acl_dup(acl);
}
if (!rc)
set_cached_acl(inode, type, acl);
return rc;
}

10
fs/jfs/xattr.c
View file

@ -727,10 +727,7 @@ static int can_set_system_xattr(struct inode *inode, const char *name,
/*
* We're changing the ACL. Get rid of the cached one
*/
acl =inode->i_acl;
if (acl != ACL_NOT_CACHED)
posix_acl_release(acl);
inode->i_acl = ACL_NOT_CACHED;
forget_cached_acl(inode, ACL_TYPE_ACCESS);
return 0;
} else if (strcmp(name, POSIX_ACL_XATTR_DEFAULT) == 0) {
@ -746,10 +743,7 @@ static int can_set_system_xattr(struct inode *inode, const char *name,
/*
* We're changing the default ACL. Get rid of the cached one
*/
acl = inode->i_default_acl;
if (acl && (acl != ACL_NOT_CACHED))
posix_acl_release(acl);
inode->i_default_acl = ACL_NOT_CACHED;
forget_cached_acl(inode, ACL_TYPE_DEFAULT);
return 0;
}

49
fs/reiserfs/xattr_acl.c
View file

@ -188,29 +188,6 @@ static void *posix_acl_to_disk(const struct posix_acl *acl, size_t * size)
return ERR_PTR(-EINVAL);
}
static inline void iset_acl(struct inode *inode, struct posix_acl **i_acl,
struct posix_acl *acl)
{
spin_lock(&inode->i_lock);
if (*i_acl != ACL_NOT_CACHED)
posix_acl_release(*i_acl);
*i_acl = posix_acl_dup(acl);
spin_unlock(&inode->i_lock);
}
static inline struct posix_acl *iget_acl(struct inode *inode,
struct posix_acl **i_acl)
{
struct posix_acl *acl = ACL_NOT_CACHED;
spin_lock(&inode->i_lock);
if (*i_acl != ACL_NOT_CACHED)
acl = posix_acl_dup(*i_acl);
spin_unlock(&inode->i_lock);
return acl;
}
/*
* Inode operation get_posix_acl().
*
@ -220,31 +197,29 @@ static inline struct posix_acl *iget_acl(struct inode *inode,
struct posix_acl *reiserfs_get_acl(struct inode *inode, int type)
{
char *name, *value;
struct posix_acl *acl, **p_acl;
struct posix_acl *acl;
int size;
int retval;
acl = get_cached_acl(inode, type);
if (acl != ACL_NOT_CACHED)
return acl;
switch (type) {
case ACL_TYPE_ACCESS:
name = POSIX_ACL_XATTR_ACCESS;
p_acl = &inode->i_acl;
break;
case ACL_TYPE_DEFAULT:
name = POSIX_ACL_XATTR_DEFAULT;
p_acl = &inode->i_default_acl;
break;
default:
return ERR_PTR(-EINVAL);
BUG();
}
acl = iget_acl(inode, p_acl);
if (acl != ACL_NOT_CACHED)
return acl;
size = reiserfs_xattr_get(inode, name, NULL, 0);
if (size < 0) {
if (size == -ENODATA || size == -ENOSYS) {
*p_acl = NULL;
set_cached_acl(inode, type, NULL);
return NULL;
}
return ERR_PTR(size);
@ -259,14 +234,13 @@ struct posix_acl *reiserfs_get_acl(struct inode *inode, int type)
/* This shouldn't actually happen as it should have
been caught above.. but just in case */
acl = NULL;
*p_acl = acl;
} else if (retval < 0) {
acl = ERR_PTR(retval);
} else {
acl = posix_acl_from_disk(value, retval);
if (!IS_ERR(acl))
iset_acl(inode, p_acl, acl);
}
if (!IS_ERR(acl))
set_cached_acl(inode, type, acl);
kfree(value);
return acl;
@ -284,7 +258,6 @@ reiserfs_set_acl(struct reiserfs_transaction_handle *th, struct inode *inode,
{
char *name;
void *value = NULL;
struct posix_acl **p_acl;
size_t size = 0;
int error;
@ -294,7 +267,6 @@ reiserfs_set_acl(struct reiserfs_transaction_handle *th, struct inode *inode,
switch (type) {
case ACL_TYPE_ACCESS:
name = POSIX_ACL_XATTR_ACCESS;
p_acl = &inode->i_acl;
if (acl) {
mode_t mode = inode->i_mode;
error = posix_acl_equiv_mode(acl, &mode);
@ -309,7 +281,6 @@ reiserfs_set_acl(struct reiserfs_transaction_handle *th, struct inode *inode,
break;
case ACL_TYPE_DEFAULT:
name = POSIX_ACL_XATTR_DEFAULT;
p_acl = &inode->i_default_acl;
if (!S_ISDIR(inode->i_mode))
return acl ? -EACCES : 0;
break;
@ -342,7 +313,7 @@ reiserfs_set_acl(struct reiserfs_transaction_handle *th, struct inode *inode,
kfree(value);
if (!error)
iset_acl(inode, p_acl, acl);
set_cached_acl(inode, type, acl);
return error;
}

2
fs/ubifs/xattr.c
View file

@ -55,9 +55,9 @@
* ACL support is not implemented.
*/
#include "ubifs.h"
#include <linux/xattr.h>
#include <linux/posix_acl_xattr.h>
#include "ubifs.h"
/*
* Limit the number of extended attributes per inode so that the total size

64
include/linux/posix_acl.h
View file

@ -83,4 +83,68 @@ extern int posix_acl_chmod_masq(struct posix_acl *, mode_t);
extern struct posix_acl *get_posix_acl(struct inode *, int);
extern int set_posix_acl(struct inode *, int, struct posix_acl *);
static inline struct posix_acl *get_cached_acl(struct inode *inode, int type)
{
struct posix_acl **p, *acl;
switch (type) {
case ACL_TYPE_ACCESS:
p = &inode->i_acl;
break;
case ACL_TYPE_DEFAULT:
p = &inode->i_default_acl;
break;
default:
return ERR_PTR(-EINVAL);
}
acl = ACCESS_ONCE(*p);
if (acl) {
spin_lock(&inode->i_lock);
acl = *p;
if (acl != ACL_NOT_CACHED)
acl = posix_acl_dup(acl);
spin_unlock(&inode->i_lock);
}
return acl;
}
static inline void set_cached_acl(struct inode *inode,
int type,
struct posix_acl *acl)
{
struct posix_acl *old = NULL;
spin_lock(&inode->i_lock);
switch (type) {
case ACL_TYPE_ACCESS:
old = inode->i_acl;
inode->i_acl = posix_acl_dup(acl);
break;
case ACL_TYPE_DEFAULT:
old = inode->i_default_acl;
inode->i_default_acl = posix_acl_dup(acl);
break;
}
spin_unlock(&inode->i_lock);
if (old != ACL_NOT_CACHED)
posix_acl_release(old);
}
static inline void forget_cached_acl(struct inode *inode, int type)
{
struct posix_acl *old = NULL;
spin_lock(&inode->i_lock);
switch (type) {
case ACL_TYPE_ACCESS:
old = inode->i_acl;
inode->i_acl = ACL_NOT_CACHED;
break;
case ACL_TYPE_DEFAULT:
old = inode->i_default_acl;
inode->i_default_acl = ACL_NOT_CACHED;
break;
}
spin_unlock(&inode->i_lock);
if (old != ACL_NOT_CACHED)
posix_acl_release(old);
}
#endif /* __LINUX_POSIX_ACL_H */