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SubjectRe: [PATCH v2 2/2] staging: erofs: complete POSIX ACL support
On Sat, Jan 26, 2019 at 10:48:53AM +0800, Chao Yu wrote:
> On 2019/1/26 0:10, Gao Xiang wrote:
> > Let's add .get_acl() to read the file's acl from its xattrs
> > to make POSIX ACL usable.
> >
> > Here is the on-disk detail,
> > fullname: system.posix_acl_access
> > struct erofs_xattr_entry:
> > .e_name_len = 0
> > .e_name_index = EROFS_XATTR_INDEX_POSIX_ACL_ACCESS (2)
> >
> > fullname: system.posix_acl_default
> > struct erofs_xattr_entry:
> > .e_name_len = 0
> > .e_name_index = EROFS_XATTR_INDEX_POSIX_ACL_DEFAULT (3)
> >
> > Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
> > ---
> > change log v2:
> > - add the missing SB_POSIXACL flag;
> > - fix the on-disk detail, use .e_name_len == 0 and proper prefix value;
> > - tested ok with xattr enabled erofs_mkfs;
>
> > .../erofs/Documentation/filesystems/erofs.txt | 2 ++
> > drivers/staging/erofs/inode.c | 3 ++
> > drivers/staging/erofs/namei.c | 1 +
> > drivers/staging/erofs/super.c | 8 +++++
> > drivers/staging/erofs/xattr.c | 37 ++++++++++++++++++++++
> > drivers/staging/erofs/xattr.h | 6 ++++
> > 6 files changed, 57 insertions(+)
> >
> > diff --git a/drivers/staging/erofs/Documentation/filesystems/erofs.txt b/drivers/staging/erofs/Documentation/filesystems/erofs.txt
> > index 803988d74c21..961ec4da7705 100644
> > --- a/drivers/staging/erofs/Documentation/filesystems/erofs.txt
> > +++ b/drivers/staging/erofs/Documentation/filesystems/erofs.txt
> > @@ -36,6 +36,8 @@ Here is the main features of EROFS:
> >
> > - Support xattr inline and tail-end data inline for all files;
> >
> > + - Support POSIX.1e ACLs by using xattrs;
> > +
> > - Support transparent file compression as an option:
> > LZ4 algorithm with 4 KB fixed-output compression for high performance;
> >
> > diff --git a/drivers/staging/erofs/inode.c b/drivers/staging/erofs/inode.c
> > index 4f04f7c38cf2..924b8dfc7a8f 100644
> > --- a/drivers/staging/erofs/inode.c
> > +++ b/drivers/staging/erofs/inode.c
> > @@ -287,6 +287,7 @@ const struct inode_operations erofs_generic_iops = {
> > #ifdef CONFIG_EROFS_FS_XATTR
> > .listxattr = erofs_listxattr,
> > #endif
> > + .get_acl = erofs_get_acl,
> > };
> >
> > const struct inode_operations erofs_symlink_iops = {
> > @@ -294,6 +295,7 @@ const struct inode_operations erofs_symlink_iops = {
> > #ifdef CONFIG_EROFS_FS_XATTR
> > .listxattr = erofs_listxattr,
> > #endif
> > + .get_acl = erofs_get_acl,
> > };
> >
> > const struct inode_operations erofs_fast_symlink_iops = {
> > @@ -301,5 +303,6 @@ const struct inode_operations erofs_fast_symlink_iops = {
> > #ifdef CONFIG_EROFS_FS_XATTR
> > .listxattr = erofs_listxattr,
> > #endif
> > + .get_acl = erofs_get_acl,
> > };
> >
> > diff --git a/drivers/staging/erofs/namei.c b/drivers/staging/erofs/namei.c
> > index 7fed1f996ab0..b1752adc5934 100644
> > --- a/drivers/staging/erofs/namei.c
> > +++ b/drivers/staging/erofs/namei.c
> > @@ -238,5 +238,6 @@ const struct inode_operations erofs_dir_iops = {
> > #ifdef CONFIG_EROFS_FS_XATTR
> > .listxattr = erofs_listxattr,
> > #endif
> > + .get_acl = erofs_get_acl,
> > };
> >
> > diff --git a/drivers/staging/erofs/super.c b/drivers/staging/erofs/super.c
> > index 176fca2af379..54cd7dac0a1f 100644
> > --- a/drivers/staging/erofs/super.c
> > +++ b/drivers/staging/erofs/super.c
> > @@ -398,6 +398,14 @@ static int erofs_read_super(struct super_block *sb,
> > if (!silent)
> > infoln("root inode @ nid %llu", ROOT_NID(sbi));
> >
> > +#ifdef CONFIG_EROFS_FS_POSIX_ACL
> > + /* Update the POSIXACL Flag */
> > + if (test_opt(sbi, POSIX_ACL))
> > + sb->s_flags |= SB_POSIXACL;
> > + else
> > + sb->s_flags &= ~SB_POSIXACL;
> > +#endif
> > +
> > #ifdef CONFIG_EROFS_FS_ZIP
> > INIT_RADIX_TREE(&sbi->workstn_tree, GFP_ATOMIC);
> > #endif
> > diff --git a/drivers/staging/erofs/xattr.c b/drivers/staging/erofs/xattr.c
> > index 7de46690d972..6759485ae862 100644
> > --- a/drivers/staging/erofs/xattr.c
> > +++ b/drivers/staging/erofs/xattr.c
> > @@ -643,3 +643,40 @@ ssize_t erofs_listxattr(struct dentry *dentry,
> > return shared_listxattr(&it);
> > }
> >
> > +#ifdef CONFIG_EROFS_FS_POSIX_ACL
> > +struct posix_acl *erofs_get_acl(struct inode *inode, int type)
> > +{
> > + struct posix_acl *acl;
> > + int ea_prefix, rc;
> > + char *value = NULL;
> > +
> > + switch(type) {
> > + case ACL_TYPE_ACCESS:
> > + ea_prefix = EROFS_XATTR_INDEX_POSIX_ACL_ACCESS;
> > + break;
> > + case ACL_TYPE_DEFAULT:
> > + ea_prefix = EROFS_XATTR_INDEX_POSIX_ACL_DEFAULT;
> > + break;
> > + default:
> > + return ERR_PTR(-EINVAL);
> > + }
> > +
> > + rc = erofs_getxattr(inode, ea_prefix, "", NULL, 0);
> > + if (rc > 0) {
> > + value = kvmalloc(rc, GFP_KERNEL);
>
> erofs_kmalloc() is enough?
>
> Thanks,
>

Hopefully, regular kmalloc() is enough.

Do really need the erofs_kmalloc() function? Regular kmalloc() has
fault injection already. Have you tried to use it?

regards,
dan carpenter


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