Hello,
This patch adds proper full ACL support to btrfs. I''ve tested this
with the ACL
tests in LTP and in the XFS stuff and everything is on par with ext*. Alot of
this will probably have to be re-arranged when fs_mutex goes bye-bye, but it
shouldnt be too bad. Thanks much,
Signed-off-by: Josef Bacik <jbacik@redhat.com>
diff -r 79b81fd6dd78 acl.c
--- a/acl.c Thu Jun 12 14:46:17 2008 -0400
+++ b/acl.c Wed Jun 18 17:34:41 2008 -0400
@@ -20,76 +20,281 @@
#include <linux/string.h>
#include <linux/xattr.h>
#include <linux/posix_acl_xattr.h>
+#include <linux/posix_acl.h>
#include <linux/sched.h>
+
#include "ctree.h"
+#include "btrfs_inode.h"
#include "xattr.h"
-#ifndef is_owner_or_cap
-#define is_owner_or_cap(inode) \
- ((current->fsuid == (inode)->i_uid) || capable(CAP_FOWNER))
-#endif
+
+static struct posix_acl *btrfs_get_acl(struct inode *inode, int type)
+{
+ int size, name_index;
+ char *value = NULL;
+ struct posix_acl *acl = NULL;
+
+ if (type == ACL_TYPE_ACCESS)
+ name_index = BTRFS_XATTR_INDEX_POSIX_ACL_ACCESS;
+ else
+ name_index = BTRFS_XATTR_INDEX_POSIX_ACL_DEFAULT;
+
+
+ size = btrfs_xattr_get_locked(inode, name_index, "", NULL, 0);
+ if (size > 0) {
+ value = kzalloc(size, GFP_NOFS);
+ if (!value)
+ return ERR_PTR(-ENOMEM);
+ size = btrfs_xattr_get_locked(inode, name_index, "", value,
+ size);
+ if (size > 0)
+ acl = posix_acl_from_xattr(value, size);
+ kfree(value);
+ }
+
+ return acl;
+}
+
+static int btrfs_xattr_get_acl(struct inode *inode, int type,
+ void *value, size_t size)
+{
+ struct posix_acl *acl;
+ struct btrfs_root *root = BTRFS_I(inode)->root;
+ int ret = 0;
+
+ mutex_lock(&root->fs_info->fs_mutex);
+ acl = btrfs_get_acl(inode, type);
+ mutex_unlock(&root->fs_info->fs_mutex);
+
+ if (IS_ERR(acl))
+ return PTR_ERR(acl);
+ if (acl == NULL)
+ return -ENODATA;
+ ret = posix_acl_to_xattr(acl, value, size);
+ posix_acl_release(acl);
+
+ return ret;
+}
+
+/*
+ * Needs to be called with fs_mutex held
+ */
+static int btrfs_set_acl(struct inode *inode, struct posix_acl *acl, int type)
+{
+ int ret, name_index = 0, size = 0;
+ char *value = NULL;
+
+ if (acl) {
+ mode_t mode;
+
+ ret = posix_acl_valid(acl);
+ if (ret < 0)
+ goto out;
+
+ switch (type) {
+ case ACL_TYPE_ACCESS:
+ mode = inode->i_mode;
+ ret = posix_acl_equiv_mode(acl, &mode);
+ if (ret < 0)
+ goto out;
+ ret = 0;
+ inode->i_mode = mode;
+ name_index = BTRFS_XATTR_INDEX_POSIX_ACL_ACCESS;
+ break;
+ case ACL_TYPE_DEFAULT:
+ if (!S_ISDIR(inode->i_mode)) {
+ ret = -EINVAL;
+ goto out;
+ }
+ name_index = BTRFS_XATTR_INDEX_POSIX_ACL_DEFAULT;
+ break;
+ }
+
+ size = posix_acl_xattr_size(acl->a_count);
+ value = kmalloc(size, GFP_NOFS);
+ if (!value) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ ret = posix_acl_to_xattr(acl, value, size);
+ if (ret < 0)
+ goto out;
+ }
+
+ ret = btrfs_xattr_set_locked(inode, name_index, "", value, size,
0);
+
+out:
+ if (value)
+ kfree(value);
+
+ return ret;
+}
static int btrfs_xattr_set_acl(struct inode *inode, int type,
const void *value, size_t size)
{
int ret = 0;
- struct posix_acl *acl;
+ struct posix_acl *acl = NULL;
+ struct btrfs_root *root = BTRFS_I(inode)->root;
- if (!is_owner_or_cap(inode))
- return -EPERM;
if (value) {
acl = posix_acl_from_xattr(value, size);
if (acl == NULL) {
value = NULL;
size = 0;
} else if (IS_ERR(acl)) {
- ret = PTR_ERR(acl);
- } else {
- ret = posix_acl_valid(acl);
- posix_acl_release(acl);
+ return PTR_ERR(acl);
}
- if (ret)
- return ret;
}
- return btrfs_xattr_set(inode, type, "", value, size, 0);
+
+ mutex_lock(&root->fs_info->fs_mutex);
+
+ ret = btrfs_set_acl(inode, acl, type);
+
+ mutex_unlock(&root->fs_info->fs_mutex);
+
+ posix_acl_release(acl);
+
+ return ret;
}
-static int btrfs_xattr_get_acl(struct inode *inode, int type,
- void *value, size_t size)
-{
- return btrfs_xattr_get(inode, type, "", value, size);
-}
+
static int btrfs_xattr_acl_access_get(struct inode *inode, const char *name,
void *value, size_t size)
{
- if (*name != ''\0'')
- return -EINVAL;
- return btrfs_xattr_get_acl(inode, BTRFS_XATTR_INDEX_POSIX_ACL_ACCESS,
- value, size);
+ return btrfs_xattr_get_acl(inode, ACL_TYPE_ACCESS, value, size);
}
+
static int btrfs_xattr_acl_access_set(struct inode *inode, const char *name,
const void *value, size_t size, int flags)
{
- if (*name != ''\0'')
- return -EINVAL;
- return btrfs_xattr_set_acl(inode, BTRFS_XATTR_INDEX_POSIX_ACL_ACCESS,
- value, size);
+ return btrfs_xattr_set_acl(inode, ACL_TYPE_ACCESS, value, size);
}
+
static int btrfs_xattr_acl_default_get(struct inode *inode, const char *name,
void *value, size_t size)
{
- if (*name != ''\0'')
- return -EINVAL;
- return btrfs_xattr_get_acl(inode, BTRFS_XATTR_INDEX_POSIX_ACL_DEFAULT,
- value, size);
+ return btrfs_xattr_get_acl(inode, ACL_TYPE_DEFAULT, value, size);
}
+
static int btrfs_xattr_acl_default_set(struct inode *inode, const char *name,
const void *value, size_t size, int flags)
{
- if (*name != ''\0'')
- return -EINVAL;
- return btrfs_xattr_set_acl(inode, BTRFS_XATTR_INDEX_POSIX_ACL_DEFAULT,
- value, size);
+ return btrfs_xattr_set_acl(inode, ACL_TYPE_DEFAULT, value, size);
}
+
+int btrfs_check_acl(struct inode *inode, int mask)
+{
+ struct posix_acl *acl;
+ struct btrfs_root *root = BTRFS_I(inode)->root;
+ int error = -EAGAIN;
+
+ mutex_lock(&root->fs_info->fs_mutex);
+ acl = btrfs_get_acl(inode, ACL_TYPE_ACCESS);
+ mutex_unlock(&root->fs_info->fs_mutex);
+
+ if (IS_ERR(acl))
+ return PTR_ERR(acl);
+ if (acl) {
+ error = posix_acl_permission(inode, acl, mask);
+ posix_acl_release(acl);
+ }
+
+ return error;
+}
+
+/*
+ * btrfs_init_acl is already generally called under fs_mutex, so the locking
+ * stuff has been fixed to work with that. If the locking stuff changes, we
+ * need to re-evaluate the acl locking stuff.
+ */
+int btrfs_init_acl(struct inode *inode, struct inode *dir)
+{
+ struct posix_acl *acl = NULL;
+ int ret = 0;
+
+ /* this happens with subvols */
+ if (!dir)
+ return 0;
+
+ if (!S_ISLNK(inode->i_mode)) {
+ if (IS_POSIXACL(dir)) {
+ acl = btrfs_get_acl(dir, ACL_TYPE_DEFAULT);
+ if (IS_ERR(acl))
+ return PTR_ERR(acl);
+ }
+
+ if (!acl)
+ inode->i_mode &= ~current->fs->umask;
+ }
+
+ if (IS_POSIXACL(dir) && acl) {
+ struct posix_acl *clone;
+ mode_t mode;
+
+ if (S_ISDIR(inode->i_mode)) {
+ ret = btrfs_set_acl(inode, acl, ACL_TYPE_DEFAULT);
+ if (ret)
+ goto failed;
+ }
+ clone = posix_acl_clone(acl, GFP_NOFS);
+ ret = -ENOMEM;
+ if (!clone)
+ goto failed;
+
+ mode = inode->i_mode;
+ ret = posix_acl_create_masq(clone, &mode);
+ if (ret >= 0) {
+ inode->i_mode = mode;
+ if (ret > 0) {
+ /* we need an acl */
+ ret = btrfs_set_acl(inode, clone,
+ ACL_TYPE_ACCESS);
+ }
+ }
+ }
+failed:
+ posix_acl_release(acl);
+
+ return ret;
+}
+
+int btrfs_acl_chmod(struct inode *inode)
+{
+ struct posix_acl *acl, *clone;
+ struct btrfs_root *root = BTRFS_I(inode)->root;
+ int ret = 0;
+
+ if (S_ISLNK(inode->i_mode))
+ return -EOPNOTSUPP;
+
+ if (!IS_POSIXACL(inode))
+ return 0;
+
+ mutex_lock(&root->fs_info->fs_mutex);
+ acl = btrfs_get_acl(inode, ACL_TYPE_ACCESS);
+ if (IS_ERR(acl) || !acl) {
+ mutex_unlock(&root->fs_info->fs_mutex);
+ return PTR_ERR(acl);
+ }
+
+ clone = posix_acl_clone(acl, GFP_KERNEL);
+ posix_acl_release(acl);
+ if (!clone) {
+ mutex_unlock(&root->fs_info->fs_mutex);
+ return -ENOMEM;
+ }
+
+ ret = posix_acl_chmod_masq(clone, inode->i_mode);
+ if (!ret)
+ ret = btrfs_set_acl(inode, clone, ACL_TYPE_ACCESS);
+
+ posix_acl_release(clone);
+ mutex_unlock(&root->fs_info->fs_mutex);
+
+ return ret;
+}
+
struct xattr_handler btrfs_xattr_acl_default_handler = {
.prefix = POSIX_ACL_XATTR_DEFAULT,
.list = btrfs_xattr_generic_list,
diff -r 79b81fd6dd78 ctree.h
--- a/ctree.h Thu Jun 12 14:46:17 2008 -0400
+++ b/ctree.h Wed Jun 18 17:34:41 2008 -0400
@@ -1638,4 +1638,9 @@ u64 btrfs_parse_size(char *str);
u64 btrfs_parse_size(char *str);
int btrfs_parse_options(struct btrfs_root *root, char *options);
int btrfs_sync_fs(struct super_block *sb, int wait);
+
+/* acl.c */
+int btrfs_check_acl(struct inode *inode, int mask);
+int btrfs_init_acl(struct inode *inode, struct inode *dir);
+int btrfs_acl_chmod(struct inode *inode);
#endif
diff -r 79b81fd6dd78 inode.c
--- a/inode.c Thu Jun 12 14:46:17 2008 -0400
+++ b/inode.c Wed Jun 18 17:34:41 2008 -0400
@@ -1263,6 +1263,9 @@ static int btrfs_setattr(struct dentry *
}
out:
err = inode_setattr(inode, attr);
+
+ if (!err && ((attr->ia_valid & ATTR_MODE)))
+ err = btrfs_acl_chmod(inode);
fail:
return err;
}
@@ -1890,6 +1893,12 @@ static int btrfs_mknod(struct inode *dir
if (IS_ERR(inode))
goto out_unlock;
+ err = btrfs_init_acl(inode, dir);
+ if (err) {
+ drop_inode = 1;
+ goto out_unlock;
+ }
+
btrfs_set_trans_block_group(trans, inode);
err = btrfs_add_nondir(trans, dentry, inode, 0);
if (err)
@@ -1948,6 +1957,12 @@ static int btrfs_create(struct inode *di
err = PTR_ERR(inode);
if (IS_ERR(inode))
goto out_unlock;
+
+ err = btrfs_init_acl(inode, dir);
+ if (err) {
+ drop_inode = 1;
+ goto out_unlock;
+ }
btrfs_set_trans_block_group(trans, inode);
err = btrfs_add_nondir(trans, dentry, inode, 0);
@@ -2076,6 +2091,11 @@ static int btrfs_mkdir(struct inode *dir
}
drop_on_err = 1;
+
+ err = btrfs_init_acl(inode, dir);
+ if (err)
+ goto out_fail;
+
inode->i_op = &btrfs_dir_inode_operations;
inode->i_fop = &btrfs_dir_file_operations;
btrfs_set_trans_block_group(trans, inode);
@@ -2914,6 +2934,12 @@ static int btrfs_symlink(struct inode *d
if (IS_ERR(inode))
goto out_unlock;
+ err = btrfs_init_acl(inode, dir);
+ if (err) {
+ drop_inode = 1;
+ goto out_unlock;
+ }
+
btrfs_set_trans_block_group(trans, inode);
err = btrfs_add_nondir(trans, dentry, inode, 0);
if (err)
@@ -2988,7 +3014,7 @@ static int btrfs_permission(struct inode
{
if (btrfs_test_flag(inode, READONLY) && (mask & MAY_WRITE))
return -EACCES;
- return generic_permission(inode, mask, NULL);
+ return generic_permission(inode, mask, btrfs_check_acl);
}
static struct inode_operations btrfs_dir_inode_operations = {
@@ -3068,6 +3094,10 @@ static struct inode_operations btrfs_spe
.getattr = btrfs_getattr,
.setattr = btrfs_setattr,
.permission = btrfs_permission,
+ .setxattr = generic_setxattr,
+ .getxattr = generic_getxattr,
+ .listxattr = btrfs_listxattr,
+ .removexattr = generic_removexattr,
};
static struct inode_operations btrfs_symlink_inode_operations = {
.readlink = generic_readlink,
diff -r 79b81fd6dd78 super.c
--- a/super.c Thu Jun 12 14:46:17 2008 -0400
+++ b/super.c Wed Jun 18 17:34:41 2008 -0400
@@ -67,7 +67,7 @@ enum {
enum {
Opt_degraded, Opt_subvol, Opt_device, Opt_nodatasum, Opt_nodatacow,
Opt_max_extent, Opt_max_inline, Opt_alloc_start, Opt_nobarrier,
- Opt_ssd, Opt_thread_pool, Opt_err,
+ Opt_ssd, Opt_thread_pool, Opt_noacl, Opt_err,
};
static match_table_t tokens = {
@@ -82,7 +82,8 @@ static match_table_t tokens = {
{Opt_alloc_start, "alloc_start=%s"},
{Opt_thread_pool, "thread_pool=%d"},
{Opt_ssd, "ssd"},
- {Opt_err, NULL}
+ {Opt_noacl, "noacl"},
+ {Opt_err, NULL},
};
u64 btrfs_parse_size(char *str)
@@ -213,6 +214,9 @@ int btrfs_parse_options(struct btrfs_roo
"btrfs: allocations start at %llu\n",
info->alloc_start);
}
+ break;
+ case Opt_noacl:
+ root->fs_info->sb->s_flags &= ~MS_POSIXACL;
break;
default:
break;
@@ -300,6 +304,7 @@ static int btrfs_fill_super(struct super
sb->s_op = &btrfs_super_ops;
sb->s_xattr = btrfs_xattr_handlers;
sb->s_time_gran = 1;
+ sb->s_flags |= MS_POSIXACL;
tree_root = open_ctree(sb, fs_devices, (char *)data);
diff -r 79b81fd6dd78 xattr.c
--- a/xattr.c Thu Jun 12 14:46:17 2008 -0400
+++ b/xattr.c Wed Jun 18 17:34:41 2008 -0400
@@ -26,25 +26,27 @@
#include "transaction.h"
#include "xattr.h"
#include "disk-io.h"
+
static struct xattr_handler *btrfs_xattr_handler_map[] = {
[BTRFS_XATTR_INDEX_USER] = &btrfs_xattr_user_handler,
#ifdef CONFIG_FS_POSIX_ACL
-// [BTRFS_XATTR_INDEX_POSIX_ACL_ACCESS] = &btrfs_xattr_acl_access_handler,
-// [BTRFS_XATTR_INDEX_POSIX_ACL_DEFAULT] =
&btrfs_xattr_acl_default_handler,
+ [BTRFS_XATTR_INDEX_POSIX_ACL_ACCESS] = &btrfs_xattr_acl_access_handler,
+ [BTRFS_XATTR_INDEX_POSIX_ACL_DEFAULT] = &btrfs_xattr_acl_default_handler,
#endif
[BTRFS_XATTR_INDEX_TRUSTED] = &btrfs_xattr_trusted_handler,
[BTRFS_XATTR_INDEX_SECURITY] = &btrfs_xattr_security_handler,
-// [BTRFS_XATTR_INDEX_SYSTEM] = &btrfs_xattr_system_handler,
+ [BTRFS_XATTR_INDEX_SYSTEM] = &btrfs_xattr_system_handler,
};
+
struct xattr_handler *btrfs_xattr_handlers[] = {
&btrfs_xattr_user_handler,
#ifdef CONFIG_FS_POSIX_ACL
-// &btrfs_xattr_acl_access_handler,
-// &btrfs_xattr_acl_default_handler,
+ &btrfs_xattr_acl_access_handler,
+ &btrfs_xattr_acl_default_handler,
#endif
&btrfs_xattr_trusted_handler,
&btrfs_xattr_security_handler,
-// &btrfs_xattr_system_handler,
+ &btrfs_xattr_system_handler,
NULL,
};
@@ -129,8 +131,12 @@ size_t btrfs_xattr_generic_list(struct i
return name_len+1;
}
-ssize_t btrfs_xattr_get(struct inode *inode, int name_index,
- const char *attr_name, void *buffer, size_t size)
+/*
+ * Use this if fs_mutex is already held
+ */
+ssize_t btrfs_xattr_get_locked(struct inode *inode, int name_index,
+ const char *attr_name, void *buffer,
+ size_t size)
{
struct btrfs_dir_item *di;
struct btrfs_root *root = BTRFS_I(inode)->root;
@@ -153,7 +159,6 @@ ssize_t btrfs_xattr_get(struct inode *in
return -ENOMEM;
}
- mutex_lock(&root->fs_info->fs_mutex);
/* lookup the xattr by name */
di = btrfs_lookup_xattr(NULL, root, path, inode->i_ino, name,
strlen(name), 0);
@@ -179,17 +184,34 @@ ssize_t btrfs_xattr_get(struct inode *in
read_extent_buffer(leaf, buffer, data_ptr,
btrfs_dir_data_len(leaf, di));
ret = btrfs_dir_data_len(leaf, di);
-
out:
- mutex_unlock(&root->fs_info->fs_mutex);
kfree(name);
btrfs_free_path(path);
return ret;
}
-int btrfs_xattr_set(struct inode *inode, int name_index,
- const char *attr_name, const void *value, size_t size,
- int flags)
+ssize_t btrfs_xattr_get(struct inode *inode, int name_index,
+ const char *attr_name, void *buffer, size_t size)
+{
+ struct btrfs_root *root = BTRFS_I(inode)->root;
+ ssize_t ret = 0;
+
+ mutex_lock(&root->fs_info->fs_mutex);
+
+ ret = btrfs_xattr_get_locked(inode, name_index, attr_name, buffer,
+ size);
+
+ mutex_unlock(&root->fs_info->fs_mutex);
+
+ return ret;
+}
+
+/*
+ * Use this if we are already under fs_mutex
+ */
+int btrfs_xattr_set_locked(struct inode *inode, int name_index,
+ const char *attr_name, const void *value,
+ size_t size, int flags)
{
struct btrfs_dir_item *di;
struct btrfs_root *root = BTRFS_I(inode)->root;
@@ -210,11 +232,8 @@ int btrfs_xattr_set(struct inode *inode,
return -ENOMEM;
}
- mutex_lock(&root->fs_info->fs_mutex);
trans = btrfs_start_transaction(root, 1);
btrfs_set_trans_block_group(trans, inode);
-
- /* first lets see if we already have this xattr */
di = btrfs_lookup_xattr(trans, root, path, inode->i_ino, name,
strlen(name), -1);
if (IS_ERR(di)) {
@@ -233,6 +252,7 @@ int btrfs_xattr_set(struct inode *inode,
ret = btrfs_delete_one_dir_name(trans, root, path, di);
if (ret)
goto out;
+
btrfs_release_path(root, path);
/* if we don''t have a value then we are removing the xattr */
@@ -260,9 +280,24 @@ out:
}
btrfs_end_transaction(trans, root);
- mutex_unlock(&root->fs_info->fs_mutex);
kfree(name);
btrfs_free_path(path);
+
+ return ret;
+}
+
+int btrfs_xattr_set(struct inode *inode, int name_index, const char *attr_name,
+ const void *value, size_t size, int flags)
+{
+ struct btrfs_root *root = BTRFS_I(inode)->root;
+ int ret = 0;
+
+ mutex_lock(&root->fs_info->fs_mutex);
+
+ ret = btrfs_xattr_set_locked(inode, name_index, attr_name, value,
+ size, flags);
+
+ mutex_unlock(&root->fs_info->fs_mutex);
return ret;
}
diff -r 79b81fd6dd78 xattr.h
--- a/xattr.h Thu Jun 12 14:46:17 2008 -0400
+++ b/xattr.h Wed Jun 18 17:34:41 2008 -0400
@@ -42,11 +42,15 @@ extern struct xattr_handler btrfs_xattr_
extern struct xattr_handler *btrfs_xattr_handlers[];
+ssize_t btrfs_xattr_get_locked(struct inode *inode, int name_index,
+ const char *name, void *buffer, size_t size);
ssize_t btrfs_xattr_get(struct inode *inode, int name_index, const char *name,
void *buffer, size_t size);
+int btrfs_xattr_set_locked(struct inode *inode, int name_index,
+ const char *name, const void *value,
+ size_t size, int flags);
int btrfs_xattr_set(struct inode *inode, int name_index, const char *name,
const void *value, size_t size, int flags);
-
/*
* the only reason this is public is for acl.c. There may be a point where
* acl.c doesn''t need it, and if thats the case we need to remove it
and make
--
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