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ext2/3/4: use generic posix ACL infrastructure

Browse source 
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Christoph Hellwig 2013-12-20 05:16:44 -08:00 committed by Al Viro
parent 996a710d46
commit 64e178a711
21 changed files with 109 additions and 614 deletions
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190
fs/ext2/acl.c
View file

@ -148,13 +148,6 @@ ext2_get_acl(struct inode *inode, int type)
struct posix_acl *acl;
int retval;
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:
name_index = EXT2_XATTR_INDEX_POSIX_ACL_ACCESS;
@ -189,19 +182,14 @@ ext2_get_acl(struct inode *inode, int type)
/*
* inode->i_mutex: down
*/
static int
ext2_set_acl(struct inode *inode, int type, struct posix_acl *acl)
int
ext2_set_acl(struct inode *inode, struct posix_acl *acl, int type)
{
int name_index;
void *value = NULL;
size_t size = 0;
int error;
if (S_ISLNK(inode->i_mode))
return -EOPNOTSUPP;
if (!test_opt(inode->i_sb, POSIX_ACL))
return 0;
switch(type) {
case ACL_TYPE_ACCESS:
name_index = EXT2_XATTR_INDEX_POSIX_ACL_ACCESS;
@ -250,169 +238,21 @@ ext2_set_acl(struct inode *inode, int type, struct posix_acl *acl)
int
ext2_init_acl(struct inode *inode, struct inode *dir)
{
struct posix_acl *acl = NULL;
int error = 0;
struct posix_acl *default_acl, *acl;
int error;
if (!S_ISLNK(inode->i_mode)) {
if (test_opt(dir->i_sb, POSIX_ACL)) {
acl = ext2_get_acl(dir, ACL_TYPE_DEFAULT);
if (IS_ERR(acl))
return PTR_ERR(acl);
}
if (!acl)
inode->i_mode &= ~current_umask();
}
if (test_opt(inode->i_sb, POSIX_ACL) && acl) {
if (S_ISDIR(inode->i_mode)) {
error = ext2_set_acl(inode, ACL_TYPE_DEFAULT, acl);
if (error)
goto cleanup;
}
error = __posix_acl_create(&acl, GFP_KERNEL, &inode->i_mode);
if (error < 0)
return error;
if (error > 0) {
/* This is an extended ACL */
error = ext2_set_acl(inode, ACL_TYPE_ACCESS, acl);
}
}
cleanup:
posix_acl_release(acl);
return error;
}
/*
* Does chmod for an inode that may have an Access Control List. The
* inode->i_mode field must be updated to the desired value by the caller
* before calling this function.
* Returns 0 on success, or a negative error number.
*
* We change the ACL rather than storing some ACL entries in the file
* mode permission bits (which would be more efficient), because that
* would break once additional permissions (like ACL_APPEND, ACL_DELETE
* for directories) are added. There are no more bits available in the
* file mode.
*
* inode->i_mutex: down
*/
int
ext2_acl_chmod(struct inode *inode)
{
struct posix_acl *acl;
int error;
if (!test_opt(inode->i_sb, POSIX_ACL))
return 0;
if (S_ISLNK(inode->i_mode))
return -EOPNOTSUPP;
acl = ext2_get_acl(inode, ACL_TYPE_ACCESS);
if (IS_ERR(acl) || !acl)
return PTR_ERR(acl);
error = __posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode);
error = posix_acl_create(dir, &inode->i_mode, &default_acl, &acl);
if (error)
return error;
error = ext2_set_acl(inode, ACL_TYPE_ACCESS, acl);
posix_acl_release(acl);
if (default_acl) {
error = ext2_set_acl(inode, default_acl, ACL_TYPE_DEFAULT);
posix_acl_release(default_acl);
}
if (acl) {
if (!error)
error = ext2_set_acl(inode, acl, ACL_TYPE_ACCESS);
posix_acl_release(acl);
}
return error;
}
/*
* Extended attribut handlers
*/
static size_t
ext2_xattr_list_acl_access(struct dentry *dentry, char *list, size_t list_size,
const char *name, size_t name_len, int type)
{
const size_t size = sizeof(POSIX_ACL_XATTR_ACCESS);
if (!test_opt(dentry->d_sb, POSIX_ACL))
return 0;
if (list && size <= list_size)
memcpy(list, POSIX_ACL_XATTR_ACCESS, size);
return size;
}
static size_t
ext2_xattr_list_acl_default(struct dentry *dentry, char *list, size_t list_size,
const char *name, size_t name_len, int type)
{
const size_t size = sizeof(POSIX_ACL_XATTR_DEFAULT);
if (!test_opt(dentry->d_sb, POSIX_ACL))
return 0;
if (list && size <= list_size)
memcpy(list, POSIX_ACL_XATTR_DEFAULT, size);
return size;
}
static int
ext2_xattr_get_acl(struct dentry *dentry, const char *name, void *buffer,
size_t size, int type)
{
struct posix_acl *acl;
int error;
if (strcmp(name, "") != 0)
return -EINVAL;
if (!test_opt(dentry->d_sb, POSIX_ACL))
return -EOPNOTSUPP;
acl = ext2_get_acl(dentry->d_inode, type);
if (IS_ERR(acl))
return PTR_ERR(acl);
if (acl == NULL)
return -ENODATA;
error = posix_acl_to_xattr(&init_user_ns, acl, buffer, size);
posix_acl_release(acl);
return error;
}
static int
ext2_xattr_set_acl(struct dentry *dentry, const char *name, const void *value,
size_t size, int flags, int type)
{
struct posix_acl *acl;
int error;
if (strcmp(name, "") != 0)
return -EINVAL;
if (!test_opt(dentry->d_sb, POSIX_ACL))
return -EOPNOTSUPP;
if (!inode_owner_or_capable(dentry->d_inode))
return -EPERM;
if (value) {
acl = posix_acl_from_xattr(&init_user_ns, value, size);
if (IS_ERR(acl))
return PTR_ERR(acl);
else if (acl) {
error = posix_acl_valid(acl);
if (error)
goto release_and_out;
}
} else
acl = NULL;
error = ext2_set_acl(dentry->d_inode, type, acl);
release_and_out:
posix_acl_release(acl);
return error;
}
const struct xattr_handler ext2_xattr_acl_access_handler = {
.prefix = POSIX_ACL_XATTR_ACCESS,
.flags = ACL_TYPE_ACCESS,
.list = ext2_xattr_list_acl_access,
.get = ext2_xattr_get_acl,
.set = ext2_xattr_set_acl,
};
const struct xattr_handler ext2_xattr_acl_default_handler = {
.prefix = POSIX_ACL_XATTR_DEFAULT,
.flags = ACL_TYPE_DEFAULT,
.list = ext2_xattr_list_acl_default,
.get = ext2_xattr_get_acl,
.set = ext2_xattr_set_acl,
};

8
fs/ext2/acl.h
View file

@ -55,7 +55,7 @@ static inline int ext2_acl_count(size_t size)
/* acl.c */
extern struct posix_acl *ext2_get_acl(struct inode *inode, int type);
extern int ext2_acl_chmod (struct inode *);
extern int ext2_set_acl(struct inode *inode, struct posix_acl *acl, int type);
extern int ext2_init_acl (struct inode *, struct inode *);
#else
@ -63,12 +63,6 @@ extern int ext2_init_acl (struct inode *, struct inode *);
#define ext2_get_acl NULL
#define ext2_set_acl NULL
static inline int
ext2_acl_chmod (struct inode *inode)
{
return 0;
}
static inline int ext2_init_acl (struct inode *inode, struct inode *dir)
{
return 0;

1
fs/ext2/file.c
View file

@ -103,5 +103,6 @@ const struct inode_operations ext2_file_inode_operations = {
#endif
.setattr = ext2_setattr,
.get_acl = ext2_get_acl,
.set_acl = ext2_set_acl,
.fiemap = ext2_fiemap,
};

2
fs/ext2/inode.c
View file

@ -1566,7 +1566,7 @@ int ext2_setattr(struct dentry *dentry, struct iattr *iattr)
}
setattr_copy(inode, iattr);
if (iattr->ia_valid & ATTR_MODE)
error = ext2_acl_chmod(inode);
error = posix_acl_chmod(inode, inode->i_mode);
mark_inode_dirty(inode);
return error;

2
fs/ext2/namei.c
View file

@ -421,6 +421,7 @@ const struct inode_operations ext2_dir_inode_operations = {
#endif
.setattr = ext2_setattr,
.get_acl = ext2_get_acl,
.set_acl = ext2_set_acl,
.tmpfile = ext2_tmpfile,
};
@ -433,4 +434,5 @@ const struct inode_operations ext2_special_inode_operations = {
#endif
.setattr = ext2_setattr,
.get_acl = ext2_get_acl,
.set_acl = ext2_set_acl,
};

8
fs/ext2/xattr.c
View file

@ -103,8 +103,8 @@ static struct mb_cache *ext2_xattr_cache;
static const struct xattr_handler *ext2_xattr_handler_map[] = {
[EXT2_XATTR_INDEX_USER] = &ext2_xattr_user_handler,
#ifdef CONFIG_EXT2_FS_POSIX_ACL
[EXT2_XATTR_INDEX_POSIX_ACL_ACCESS] = &ext2_xattr_acl_access_handler,
[EXT2_XATTR_INDEX_POSIX_ACL_DEFAULT] = &ext2_xattr_acl_default_handler,
[EXT2_XATTR_INDEX_POSIX_ACL_ACCESS] = &posix_acl_access_xattr_handler,
[EXT2_XATTR_INDEX_POSIX_ACL_DEFAULT] = &posix_acl_default_xattr_handler,
#endif
[EXT2_XATTR_INDEX_TRUSTED] = &ext2_xattr_trusted_handler,
#ifdef CONFIG_EXT2_FS_SECURITY
@ -116,8 +116,8 @@ const struct xattr_handler *ext2_xattr_handlers[] = {
&ext2_xattr_user_handler,
&ext2_xattr_trusted_handler,
#ifdef CONFIG_EXT2_FS_POSIX_ACL
&ext2_xattr_acl_access_handler,
&ext2_xattr_acl_default_handler,
&posix_acl_access_xattr_handler,
&posix_acl_default_xattr_handler,
#endif
#ifdef CONFIG_EXT2_FS_SECURITY
&ext2_xattr_security_handler,

2
fs/ext2/xattr.h
View file

@ -57,8 +57,6 @@ struct ext2_xattr_entry {
extern const struct xattr_handler ext2_xattr_user_handler;
extern const struct xattr_handler ext2_xattr_trusted_handler;
extern const struct xattr_handler ext2_xattr_acl_access_handler;
extern const struct xattr_handler ext2_xattr_acl_default_handler;
extern const struct xattr_handler ext2_xattr_security_handler;
extern ssize_t ext2_listxattr(struct dentry *, char *, size_t);

231
fs/ext3/acl.c
View file

@ -145,13 +145,6 @@ ext3_get_acl(struct inode *inode, int type)
struct posix_acl *acl;
int retval;
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:
name_index = EXT3_XATTR_INDEX_POSIX_ACL_ACCESS;
@ -190,7 +183,7 @@ ext3_get_acl(struct inode *inode, int type)
* inode->i_mutex: down unless called from ext3_new_inode
*/
static int
ext3_set_acl(handle_t *handle, struct inode *inode, int type,
__ext3_set_acl(handle_t *handle, struct inode *inode, int type,
struct posix_acl *acl)
{
int name_index;
@ -198,9 +191,6 @@ ext3_set_acl(handle_t *handle, struct inode *inode, int type,
size_t size = 0;
int error;
if (S_ISLNK(inode->i_mode))
return -EOPNOTSUPP;
switch(type) {
case ACL_TYPE_ACCESS:
name_index = EXT3_XATTR_INDEX_POSIX_ACL_ACCESS;
@ -243,6 +233,23 @@ ext3_set_acl(handle_t *handle, struct inode *inode, int type,
return error;
}
int
ext3_set_acl(struct inode *inode, struct posix_acl *acl, int type)
{
handle_t *handle;
int error, retries = 0;
retry:
handle = ext3_journal_start(inode, EXT3_DATA_TRANS_BLOCKS(inode->i_sb));
if (IS_ERR(handle))
return PTR_ERR(handle);
error = __ext3_set_acl(handle, inode, type, acl);
ext3_journal_stop(handle);
if (error == -ENOSPC && ext3_should_retry_alloc(inode->i_sb, &retries))
goto retry;
return error;
}
/*
* Initialize the ACLs of a new inode. Called from ext3_new_inode.
*
@ -252,195 +259,23 @@ ext3_set_acl(handle_t *handle, struct inode *inode, int type,
int
ext3_init_acl(handle_t *handle, struct inode *inode, struct inode *dir)
{
struct posix_acl *acl = NULL;
int error = 0;
if (!S_ISLNK(inode->i_mode)) {
if (test_opt(dir->i_sb, POSIX_ACL)) {
acl = ext3_get_acl(dir, ACL_TYPE_DEFAULT);
if (IS_ERR(acl))
return PTR_ERR(acl);
}
if (!acl)
inode->i_mode &= ~current_umask();
}
if (test_opt(inode->i_sb, POSIX_ACL) && acl) {
if (S_ISDIR(inode->i_mode)) {
error = ext3_set_acl(handle, inode,
ACL_TYPE_DEFAULT, acl);
if (error)
goto cleanup;
}
error = __posix_acl_create(&acl, GFP_NOFS, &inode->i_mode);
if (error < 0)
return error;
if (error > 0) {
/* This is an extended ACL */
error = ext3_set_acl(handle, inode, ACL_TYPE_ACCESS, acl);
}
}
cleanup:
posix_acl_release(acl);
return error;
}
/*
* Does chmod for an inode that may have an Access Control List. The
* inode->i_mode field must be updated to the desired value by the caller
* before calling this function.
* Returns 0 on success, or a negative error number.
*
* We change the ACL rather than storing some ACL entries in the file
* mode permission bits (which would be more efficient), because that
* would break once additional permissions (like ACL_APPEND, ACL_DELETE
* for directories) are added. There are no more bits available in the
* file mode.
*
* inode->i_mutex: down
*/
int
ext3_acl_chmod(struct inode *inode)
{
struct posix_acl *acl;
handle_t *handle;
int retries = 0;
int error;
if (S_ISLNK(inode->i_mode))
return -EOPNOTSUPP;
if (!test_opt(inode->i_sb, POSIX_ACL))
return 0;
acl = ext3_get_acl(inode, ACL_TYPE_ACCESS);
if (IS_ERR(acl) || !acl)
return PTR_ERR(acl);
error = __posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode);
if (error)
return error;
retry:
handle = ext3_journal_start(inode,
EXT3_DATA_TRANS_BLOCKS(inode->i_sb));
if (IS_ERR(handle)) {
error = PTR_ERR(handle);
ext3_std_error(inode->i_sb, error);
goto out;
}
error = ext3_set_acl(handle, inode, ACL_TYPE_ACCESS, acl);
ext3_journal_stop(handle);
if (error == -ENOSPC &&
ext3_should_retry_alloc(inode->i_sb, &retries))
goto retry;
out:
posix_acl_release(acl);
return error;
}
/*
* Extended attribute handlers
*/
static size_t
ext3_xattr_list_acl_access(struct dentry *dentry, char *list, size_t list_len,
const char *name, size_t name_len, int type)
{
const size_t size = sizeof(POSIX_ACL_XATTR_ACCESS);
if (!test_opt(dentry->d_sb, POSIX_ACL))
return 0;
if (list && size <= list_len)
memcpy(list, POSIX_ACL_XATTR_ACCESS, size);
return size;
}
static size_t
ext3_xattr_list_acl_default(struct dentry *dentry, char *list, size_t list_len,
const char *name, size_t name_len, int type)
{
const size_t size = sizeof(POSIX_ACL_XATTR_DEFAULT);
if (!test_opt(dentry->d_sb, POSIX_ACL))
return 0;
if (list && size <= list_len)
memcpy(list, POSIX_ACL_XATTR_DEFAULT, size);
return size;
}
static int
ext3_xattr_get_acl(struct dentry *dentry, const char *name, void *buffer,
size_t size, int type)
{
struct posix_acl *acl;
struct posix_acl *default_acl, *acl;
int error;
if (strcmp(name, "") != 0)
return -EINVAL;
if (!test_opt(dentry->d_sb, POSIX_ACL))
return -EOPNOTSUPP;
acl = ext3_get_acl(dentry->d_inode, type);
if (IS_ERR(acl))
return PTR_ERR(acl);
if (acl == NULL)
return -ENODATA;
error = posix_acl_to_xattr(&init_user_ns, acl, buffer, size);
posix_acl_release(acl);
error = posix_acl_create(dir, &inode->i_mode, &default_acl, &acl);
if (error)
return error;
if (default_acl) {
error = __ext3_set_acl(handle, inode, ACL_TYPE_DEFAULT,
default_acl);
posix_acl_release(default_acl);
}
if (acl) {
if (!error)
error = __ext3_set_acl(handle, inode, ACL_TYPE_ACCESS,
acl);
posix_acl_release(acl);
}
return error;
}
static int
ext3_xattr_set_acl(struct dentry *dentry, const char *name, const void *value,
size_t size, int flags, int type)
{
struct inode *inode = dentry->d_inode;
handle_t *handle;
struct posix_acl *acl;
int error, retries = 0;
if (strcmp(name, "") != 0)
return -EINVAL;
if (!test_opt(inode->i_sb, POSIX_ACL))
return -EOPNOTSUPP;
if (!inode_owner_or_capable(inode))
return -EPERM;
if (value) {
acl = posix_acl_from_xattr(&init_user_ns, value, size);
if (IS_ERR(acl))
return PTR_ERR(acl);
else if (acl) {
error = posix_acl_valid(acl);
if (error)
goto release_and_out;
}
} else
acl = NULL;
retry:
handle = ext3_journal_start(inode, EXT3_DATA_TRANS_BLOCKS(inode->i_sb));
if (IS_ERR(handle))
return PTR_ERR(handle);
error = ext3_set_acl(handle, inode, type, acl);
ext3_journal_stop(handle);
if (error == -ENOSPC && ext3_should_retry_alloc(inode->i_sb, &retries))
goto retry;
release_and_out:
posix_acl_release(acl);
return error;
}
const struct xattr_handler ext3_xattr_acl_access_handler = {
.prefix = POSIX_ACL_XATTR_ACCESS,
.flags = ACL_TYPE_ACCESS,
.list = ext3_xattr_list_acl_access,
.get = ext3_xattr_get_acl,
.set = ext3_xattr_set_acl,
};
const struct xattr_handler ext3_xattr_acl_default_handler = {
.prefix = POSIX_ACL_XATTR_DEFAULT,
.flags = ACL_TYPE_DEFAULT,
.list = ext3_xattr_list_acl_default,
.get = ext3_xattr_get_acl,
.set = ext3_xattr_set_acl,
};

9
fs/ext3/acl.h
View file

@ -55,18 +55,13 @@ static inline int ext3_acl_count(size_t size)
/* acl.c */
extern struct posix_acl *ext3_get_acl(struct inode *inode, int type);
extern int ext3_acl_chmod (struct inode *);
extern int ext3_set_acl(struct inode *inode, struct posix_acl *acl, int type);
extern int ext3_init_acl (handle_t *, struct inode *, struct inode *);
#else /* CONFIG_EXT3_FS_POSIX_ACL */
#include <linux/sched.h>
#define ext3_get_acl NULL
static inline int
ext3_acl_chmod(struct inode *inode)
{
return 0;
}
#define ext3_set_acl NULL
static inline int
ext3_init_acl(handle_t *handle, struct inode *inode, struct inode *dir)

1
fs/ext3/file.c
View file

@ -75,6 +75,7 @@ const struct inode_operations ext3_file_inode_operations = {
.removexattr = generic_removexattr,
#endif
.get_acl = ext3_get_acl,
.set_acl = ext3_set_acl,
.fiemap = ext3_fiemap,
};

2
fs/ext3/inode.c
View file

@ -3365,7 +3365,7 @@ int ext3_setattr(struct dentry *dentry, struct iattr *attr)
mark_inode_dirty(inode);
if (ia_valid & ATTR_MODE)
rc = ext3_acl_chmod(inode);
rc = posix_acl_chmod(inode, inode->i_mode);
err_out:
ext3_std_error(inode->i_sb, error);

2
fs/ext3/namei.c
View file

@ -2569,6 +2569,7 @@ const struct inode_operations ext3_dir_inode_operations = {
.removexattr = generic_removexattr,
#endif
.get_acl = ext3_get_acl,
.set_acl = ext3_set_acl,
};
const struct inode_operations ext3_special_inode_operations = {
@ -2580,4 +2581,5 @@ const struct inode_operations ext3_special_inode_operations = {
.removexattr = generic_removexattr,
#endif
.get_acl = ext3_get_acl,
.set_acl = ext3_set_acl,
};

8
fs/ext3/xattr.c
View file

@ -102,8 +102,8 @@ static struct mb_cache *ext3_xattr_cache;
static const struct xattr_handler *ext3_xattr_handler_map[] = {
[EXT3_XATTR_INDEX_USER] = &ext3_xattr_user_handler,
#ifdef CONFIG_EXT3_FS_POSIX_ACL
[EXT3_XATTR_INDEX_POSIX_ACL_ACCESS] = &ext3_xattr_acl_access_handler,
[EXT3_XATTR_INDEX_POSIX_ACL_DEFAULT] = &ext3_xattr_acl_default_handler,
[EXT3_XATTR_INDEX_POSIX_ACL_ACCESS] = &posix_acl_access_xattr_handler,
[EXT3_XATTR_INDEX_POSIX_ACL_DEFAULT] = &posix_acl_default_xattr_handler,
#endif
[EXT3_XATTR_INDEX_TRUSTED] = &ext3_xattr_trusted_handler,
#ifdef CONFIG_EXT3_FS_SECURITY
@ -115,8 +115,8 @@ const struct xattr_handler *ext3_xattr_handlers[] = {
&ext3_xattr_user_handler,
&ext3_xattr_trusted_handler,
#ifdef CONFIG_EXT3_FS_POSIX_ACL
&ext3_xattr_acl_access_handler,
&ext3_xattr_acl_default_handler,
&posix_acl_access_xattr_handler,
&posix_acl_default_xattr_handler,
#endif
#ifdef CONFIG_EXT3_FS_SECURITY
&ext3_xattr_security_handler,

2
fs/ext3/xattr.h
View file

@ -60,8 +60,6 @@ struct ext3_xattr_entry {
extern const struct xattr_handler ext3_xattr_user_handler;
extern const struct xattr_handler ext3_xattr_trusted_handler;
extern const struct xattr_handler ext3_xattr_acl_access_handler;
extern const struct xattr_handler ext3_xattr_acl_default_handler;
extern const struct xattr_handler ext3_xattr_security_handler;
extern ssize_t ext3_listxattr(struct dentry *, char *, size_t);

231
fs/ext4/acl.c
View file

@ -152,13 +152,6 @@ ext4_get_acl(struct inode *inode, int type)
struct posix_acl *acl;
int retval;
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:
name_index = EXT4_XATTR_INDEX_POSIX_ACL_ACCESS;
@ -196,7 +189,7 @@ ext4_get_acl(struct inode *inode, int type)
* inode->i_mutex: down unless called from ext4_new_inode
*/
static int
ext4_set_acl(handle_t *handle, struct inode *inode, int type,
__ext4_set_acl(handle_t *handle, struct inode *inode, int type,
struct posix_acl *acl)
{
int name_index;
@ -204,9 +197,6 @@ ext4_set_acl(handle_t *handle, struct inode *inode, int type,
size_t size = 0;
int error;
if (S_ISLNK(inode->i_mode))
return -EOPNOTSUPP;
switch (type) {
case ACL_TYPE_ACCESS:
name_index = EXT4_XATTR_INDEX_POSIX_ACL_ACCESS;
@ -248,6 +238,25 @@ ext4_set_acl(handle_t *handle, struct inode *inode, int type,
return error;
}
int
ext4_set_acl(struct inode *inode, struct posix_acl *acl, int type)
{
handle_t *handle;
int error, retries = 0;
retry:
handle = ext4_journal_start(inode, EXT4_HT_XATTR,
ext4_jbd2_credits_xattr(inode));
if (IS_ERR(handle))
return PTR_ERR(handle);
error = __ext4_set_acl(handle, inode, type, acl);
ext4_journal_stop(handle);
if (error == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
goto retry;
return error;
}
/*
* Initialize the ACLs of a new inode. Called from ext4_new_inode.
*
@ -257,199 +266,23 @@ ext4_set_acl(handle_t *handle, struct inode *inode, int type,
int
ext4_init_acl(handle_t *handle, struct inode *inode, struct inode *dir)
{
struct posix_acl *acl = NULL;
int error = 0;
if (!S_ISLNK(inode->i_mode)) {
if (test_opt(dir->i_sb, POSIX_ACL)) {
acl = ext4_get_acl(dir, ACL_TYPE_DEFAULT);
if (IS_ERR(acl))
return PTR_ERR(acl);
}
if (!acl)
inode->i_mode &= ~current_umask();
}
if (test_opt(inode->i_sb, POSIX_ACL) && acl) {
if (S_ISDIR(inode->i_mode)) {
error = ext4_set_acl(handle, inode,
ACL_TYPE_DEFAULT, acl);
if (error)
goto cleanup;
}
error = __posix_acl_create(&acl, GFP_NOFS, &inode->i_mode);
if (error < 0)
return error;
if (error > 0) {
/* This is an extended ACL */
error = ext4_set_acl(handle, inode, ACL_TYPE_ACCESS, acl);
}
}
cleanup:
posix_acl_release(acl);
return error;
}
/*
* Does chmod for an inode that may have an Access Control List. The
* inode->i_mode field must be updated to the desired value by the caller
* before calling this function.
* Returns 0 on success, or a negative error number.
*
* We change the ACL rather than storing some ACL entries in the file
* mode permission bits (which would be more efficient), because that
* would break once additional permissions (like ACL_APPEND, ACL_DELETE
* for directories) are added. There are no more bits available in the
* file mode.
*
* inode->i_mutex: down
*/
int
ext4_acl_chmod(struct inode *inode)
{
struct posix_acl *acl;
handle_t *handle;
int retries = 0;
struct posix_acl *default_acl, *acl;
int error;
if (S_ISLNK(inode->i_mode))
return -EOPNOTSUPP;
if (!test_opt(inode->i_sb, POSIX_ACL))
return 0;
acl = ext4_get_acl(inode, ACL_TYPE_ACCESS);
if (IS_ERR(acl) || !acl)
return PTR_ERR(acl);
error = __posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode);
error = posix_acl_create(dir, &inode->i_mode, &default_acl, &acl);
if (error)
return error;
retry:
handle = ext4_journal_start(inode, EXT4_HT_XATTR,
ext4_jbd2_credits_xattr(inode));
if (IS_ERR(handle)) {
error = PTR_ERR(handle);
ext4_std_error(inode->i_sb, error);
goto out;
if (default_acl) {
error = __ext4_set_acl(handle, inode, ACL_TYPE_DEFAULT,
default_acl);
posix_acl_release(default_acl);
}
error = ext4_set_acl(handle, inode, ACL_TYPE_ACCESS, acl);
ext4_journal_stop(handle);
if (error == -ENOSPC &&
ext4_should_retry_alloc(inode->i_sb, &retries))
goto retry;
out:
posix_acl_release(acl);
return error;
}
/*
* Extended attribute handlers
*/
static size_t
ext4_xattr_list_acl_access(struct dentry *dentry, char *list, size_t list_len,
const char *name, size_t name_len, int type)
{
const size_t size = sizeof(POSIX_ACL_XATTR_ACCESS);
if (!test_opt(dentry->d_sb, POSIX_ACL))
return 0;
if (list && size <= list_len)
memcpy(list, POSIX_ACL_XATTR_ACCESS, size);
return size;
}
static size_t
ext4_xattr_list_acl_default(struct dentry *dentry, char *list, size_t list_len,
const char *name, size_t name_len, int type)
{
const size_t size = sizeof(POSIX_ACL_XATTR_DEFAULT);
if (!test_opt(dentry->d_sb, POSIX_ACL))
return 0;
if (list && size <= list_len)
memcpy(list, POSIX_ACL_XATTR_DEFAULT, size);
return size;
}
static int
ext4_xattr_get_acl(struct dentry *dentry, const char *name, void *buffer,
size_t size, int type)
{
struct posix_acl *acl;
int error;
if (strcmp(name, "") != 0)
return -EINVAL;
if (!test_opt(dentry->d_sb, POSIX_ACL))
return -EOPNOTSUPP;
acl = ext4_get_acl(dentry->d_inode, type);
if (IS_ERR(acl))
return PTR_ERR(acl);
if (acl == NULL)
return -ENODATA;
error = posix_acl_to_xattr(&init_user_ns, acl, buffer, size);
posix_acl_release(acl);
return error;
}
static int
ext4_xattr_set_acl(struct dentry *dentry, const char *name, const void *value,
size_t size, int flags, int type)
{
struct inode *inode = dentry->d_inode;
handle_t *handle;
struct posix_acl *acl;
int error, retries = 0;
if (strcmp(name, "") != 0)
return -EINVAL;
if (!test_opt(inode->i_sb, POSIX_ACL))
return -EOPNOTSUPP;
if (!inode_owner_or_capable(inode))
return -EPERM;
if (value) {
acl = posix_acl_from_xattr(&init_user_ns, value, size);
if (IS_ERR(acl))
return PTR_ERR(acl);
else if (acl) {
error = posix_acl_valid(acl);
if (error)
goto release_and_out;
}
} else
acl = NULL;
retry:
handle = ext4_journal_start(inode, EXT4_HT_XATTR,
ext4_jbd2_credits_xattr(inode));
if (IS_ERR(handle)) {
error = PTR_ERR(handle);
goto release_and_out;
if (acl) {
if (!error)
error = __ext4_set_acl(handle, inode, ACL_TYPE_ACCESS,
acl);
posix_acl_release(acl);
}
error = ext4_set_acl(handle, inode, type, acl);
ext4_journal_stop(handle);
if (error == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
goto retry;
release_and_out:
posix_acl_release(acl);
return error;
}
const struct xattr_handler ext4_xattr_acl_access_handler = {
.prefix = POSIX_ACL_XATTR_ACCESS,
.flags = ACL_TYPE_ACCESS,
.list = ext4_xattr_list_acl_access,
.get = ext4_xattr_get_acl,
.set = ext4_xattr_set_acl,
};
const struct xattr_handler ext4_xattr_acl_default_handler = {
.prefix = POSIX_ACL_XATTR_DEFAULT,
.flags = ACL_TYPE_DEFAULT,
.list = ext4_xattr_list_acl_default,
.get = ext4_xattr_get_acl,
.set = ext4_xattr_set_acl,
};

9
fs/ext4/acl.h
View file

@ -55,18 +55,13 @@ static inline int ext4_acl_count(size_t size)
/* acl.c */
struct posix_acl *ext4_get_acl(struct inode *inode, int type);
extern int ext4_acl_chmod(struct inode *);
int ext4_set_acl(struct inode *inode, struct posix_acl *acl, int type);
extern int ext4_init_acl(handle_t *, struct inode *, struct inode *);
#else /* CONFIG_EXT4_FS_POSIX_ACL */
#include <linux/sched.h>
#define ext4_get_acl NULL
static inline int
ext4_acl_chmod(struct inode *inode)
{
return 0;
}
#define ext4_set_acl NULL
static inline int
ext4_init_acl(handle_t *handle, struct inode *inode, struct inode *dir)

1
fs/ext4/file.c
View file

@ -617,6 +617,7 @@ const struct inode_operations ext4_file_inode_operations = {
.listxattr = ext4_listxattr,
.removexattr = generic_removexattr,
.get_acl = ext4_get_acl,
.set_acl = ext4_set_acl,
.fiemap = ext4_fiemap,
};

2
fs/ext4/inode.c
View file

@ -4663,7 +4663,7 @@ int ext4_setattr(struct dentry *dentry, struct iattr *attr)
ext4_orphan_del(NULL, inode);
if (!rc && (ia_valid & ATTR_MODE))
rc = ext4_acl_chmod(inode);
rc = posix_acl_chmod(inode, inode->i_mode);
err_out:
ext4_std_error(inode->i_sb, error);

2
fs/ext4/namei.c
View file

@ -3225,6 +3225,7 @@ const struct inode_operations ext4_dir_inode_operations = {
.listxattr = ext4_listxattr,
.removexattr = generic_removexattr,
.get_acl = ext4_get_acl,
.set_acl = ext4_set_acl,
.fiemap = ext4_fiemap,
};
@ -3235,4 +3236,5 @@ const struct inode_operations ext4_special_inode_operations = {
.listxattr = ext4_listxattr,
.removexattr = generic_removexattr,
.get_acl = ext4_get_acl,
.set_acl = ext4_set_acl,
};

8
fs/ext4/xattr.c
View file

@ -95,8 +95,8 @@ static struct mb_cache *ext4_xattr_cache;
static const struct xattr_handler *ext4_xattr_handler_map[] = {
[EXT4_XATTR_INDEX_USER] = &ext4_xattr_user_handler,
#ifdef CONFIG_EXT4_FS_POSIX_ACL
[EXT4_XATTR_INDEX_POSIX_ACL_ACCESS] = &ext4_xattr_acl_access_handler,
[EXT4_XATTR_INDEX_POSIX_ACL_DEFAULT] = &ext4_xattr_acl_default_handler,
[EXT4_XATTR_INDEX_POSIX_ACL_ACCESS] = &posix_acl_access_xattr_handler,
[EXT4_XATTR_INDEX_POSIX_ACL_DEFAULT] = &posix_acl_default_xattr_handler,
#endif
[EXT4_XATTR_INDEX_TRUSTED] = &ext4_xattr_trusted_handler,
#ifdef CONFIG_EXT4_FS_SECURITY
@ -108,8 +108,8 @@ const struct xattr_handler *ext4_xattr_handlers[] = {
&ext4_xattr_user_handler,
&ext4_xattr_trusted_handler,
#ifdef CONFIG_EXT4_FS_POSIX_ACL
&ext4_xattr_acl_access_handler,
&ext4_xattr_acl_default_handler,
&posix_acl_access_xattr_handler,
&posix_acl_default_xattr_handler,
#endif
#ifdef CONFIG_EXT4_FS_SECURITY
&ext4_xattr_security_handler,

2
fs/ext4/xattr.h
View file

@ -96,8 +96,6 @@ struct ext4_xattr_ibody_find {
extern const struct xattr_handler ext4_xattr_user_handler;
extern const struct xattr_handler ext4_xattr_trusted_handler;
extern const struct xattr_handler ext4_xattr_acl_access_handler;
extern const struct xattr_handler ext4_xattr_acl_default_handler;
extern const struct xattr_handler ext4_xattr_security_handler;
extern ssize_t ext4_listxattr(struct dentry *, char *, size_t);