lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

[JFFS2] Tidy up fix for ACL/permissions problem.

Browse Source 
[In commit 9ed437c50d we fixed a problem 
with standard permissions on newly-created inodes, when POSIX ACLs are 
enabled. This cleans it up...]

The attached patch separate jffs2_init_acl() into two parts.

The one is jffs2_init_acl_pre() called from jffs2_new_inode().
It compute ACL oriented inode->i_mode bits, and allocate in-memory ACL
objects associated with the new inode just before when inode meta
infomation is written to the medium.

The other is jffs2_init_acl_post() called from jffs2_symlink(),
jffs2_mkdir(), jffs2_mknod() and jffs2_do_create().
It actually writes in-memory ACL objects into the medium next to
the success of writing meta-information.

In the current implementation, we have to write a same inode meta
infomation twice when inode->i_mode is updated by the default ACL.
However, we can avoid the behavior by putting an updated i_mode
before it is written at first, as jffs2_init_acl_pre() doing.

Signed-off-by: KaiGai Kohei <kaigai@ak.jp.nec.com>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
This commit is contained in:
KaiGai Kohei
2007-09-14 15:16:35 +09:00
committed by David Woodhouse
parent e8b8c97773
commit cfc8dc6f6f
6 changed files with 94 additions and 87 deletions
Download Patch File Download Diff File Expand all files Collapse all files

101
fs/jffs2/acl.c
View File

@@ -228,11 +228,28 @@ struct posix_acl *jffs2_get_acl(struct inode *inode, int type)
return acl;
}
static int __jffs2_set_acl(struct inode *inode, int xprefix, struct posix_acl *acl)
{
char *value = NULL;
size_t size = 0;
int rc;
if (acl) {
value = jffs2_acl_to_medium(acl, &size);
if (IS_ERR(value))
return PTR_ERR(value);
}
rc = do_jffs2_setxattr(inode, xprefix, "", value, size, 0);
if (!value && rc == -ENODATA)
rc = 0;
kfree(value);
return rc;
}
static int jffs2_set_acl(struct inode *inode, int type, struct posix_acl *acl)
{
struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
size_t size = 0;
char *value = NULL;
int rc, xprefix;
if (S_ISLNK(inode->i_mode))
@@ -267,17 +284,7 @@ static int jffs2_set_acl(struct inode *inode, int type, struct posix_acl *acl)
default:
return -EINVAL;
}
if (acl) {
value = jffs2_acl_to_medium(acl, &size);
if (IS_ERR(value))
return PTR_ERR(value);
}
rc = do_jffs2_setxattr(inode, xprefix, "", value, size, 0);
if (!value && rc == -ENODATA)
rc = 0;
if (value)
kfree(value);
rc = __jffs2_set_acl(inode, xprefix, acl);
if (!rc) {
switch(type) {
case ACL_TYPE_ACCESS:
@@ -312,37 +319,59 @@ int jffs2_permission(struct inode *inode, int mask, struct nameidata *nd)
return generic_permission(inode, mask, jffs2_check_acl);
}
int jffs2_init_acl(struct inode *inode, struct posix_acl *acl)
int jffs2_init_acl_pre(struct inode *dir_i, struct inode *inode, int *i_mode)
{
struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
struct posix_acl *clone;
mode_t mode;
int rc = 0;
struct posix_acl *acl, *clone;
int rc;
f->i_acl_access = JFFS2_ACL_NOT_CACHED;
f->i_acl_default = JFFS2_ACL_NOT_CACHED;
f->i_acl_default = NULL;
f->i_acl_access = NULL;
if (S_ISLNK(*i_mode))
return 0; /* Symlink always has no-ACL */
acl = jffs2_get_acl(dir_i, ACL_TYPE_DEFAULT);
if (IS_ERR(acl))
return PTR_ERR(acl);
if (!acl) {
*i_mode &= ~current->fs->umask;
} else {
if (S_ISDIR(*i_mode))
jffs2_iset_acl(inode, &f->i_acl_default, acl);
if (acl) {
if (S_ISDIR(inode->i_mode)) {
rc = jffs2_set_acl(inode, ACL_TYPE_DEFAULT, acl);
if (rc)
goto cleanup;
}
clone = posix_acl_clone(acl, GFP_KERNEL);
rc = -ENOMEM;
if (!clone)
goto cleanup;
mode = inode->i_mode;
rc = posix_acl_create_masq(clone, &mode);
if (rc >= 0) {
inode->i_mode = mode;
if (rc > 0)
rc = jffs2_set_acl(inode, ACL_TYPE_ACCESS, clone);
}
return -ENOMEM;
rc = posix_acl_create_masq(clone, (mode_t *)i_mode);
if (rc < 0)
return rc;
if (rc > 0)
jffs2_iset_acl(inode, &f->i_acl_access, clone);
posix_acl_release(clone);
}
cleanup:
posix_acl_release(acl);
return 0;
}
int jffs2_init_acl_post(struct inode *inode)
{
struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
int rc;
if (f->i_acl_default) {
rc = __jffs2_set_acl(inode, JFFS2_XPREFIX_ACL_DEFAULT, f->i_acl_default);
if (rc)
return rc;
}
if (f->i_acl_access) {
rc = __jffs2_set_acl(inode, JFFS2_XPREFIX_ACL_ACCESS, f->i_acl_access);
if (rc)
return rc;
}
return rc;
}