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POSIX ACL changes.

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The .get_acl() method now gets passed a mnt_idmap arg, and we can now
choose to implement either .get_acl() or .get_inode_acl(). Technically
.get_acl() is a new implementation, and .get_inode_acl() is the old.
That second method now also gets an rcu flag passed, but we should be
fine either way.

Deeper under the covers however we do need to hook up the .set_acl()
method for inodes, otherwise setfacl will just fail with -ENOTSUPP. To
make this not super messy (it already is) we tack on the get_acl()
changes here.

This is all roughly ca. v6.1-rc1-4-g7420332a6ff4.

Signed-off-by: Auke Kok <auke.kok@versity.com>
This commit is contained in:
Auke Kok
2025-04-24 15:01:01 -04:00
parent 29e486e411
commit afb6ba00ad
5 changed files with 46 additions and 1 deletions
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8
kmod/src/Makefile.kernelcompat
View File

@@ -478,3 +478,11 @@ endif
ifneq (,$(shell grep '^unsigned int stack_trace_save' include/linux/stacktrace.h))
ccflags-y += -DKC_STACK_TRACE_SAVE
endif
# v6.1-rc1-4-g7420332a6ff4
#
# .get_acl() method now has dentry arg (and mnt_idmap). The old get_acl has been renamed
# to get_inode_acl() and is still available as well, but has an extra rcu param.
ifneq (,$(shell grep 'struct posix_acl ...get_acl..struct mnt_idmap ., struct dentry' include/linux/fs.h))
ccflags-y += -DKC_GET_ACL_DENTRY
endif

23
kmod/src/acl.c
View File

@@ -107,8 +107,15 @@ struct posix_acl *scoutfs_get_acl_locked(struct inode *inode, int type, struct s
return acl;
}
#ifdef KC_GET_ACL_DENTRY
struct posix_acl *scoutfs_get_acl(KC_VFS_NS_DEF
struct dentry *dentry, int type)
{
struct inode *inode = dentry->d_inode;
#else
struct posix_acl *scoutfs_get_acl(struct inode *inode, int type)
{
#endif
struct super_block *sb = inode->i_sb;
struct scoutfs_lock *lock = NULL;
struct posix_acl *acl;
@@ -201,8 +208,15 @@ out:
return ret;
}
#ifdef KC_GET_ACL_DENTRY
int scoutfs_set_acl(KC_VFS_NS_DEF
struct dentry *dentry, struct posix_acl *acl, int type)
{
struct inode *inode = dentry->d_inode;
#else
int scoutfs_set_acl(struct inode *inode, struct posix_acl *acl, int type)
{
#endif
struct super_block *sb = inode->i_sb;
struct scoutfs_lock *lock = NULL;
LIST_HEAD(ind_locks);
@@ -240,7 +254,12 @@ int scoutfs_acl_get_xattr(struct dentry *dentry, const char *name, void *value,
if (!IS_POSIXACL(dentry->d_inode))
return -EOPNOTSUPP;
#ifdef KC_GET_ACL_DENTRY
acl = scoutfs_get_acl(KC_VFS_INIT_NS
dentry, type);
#else
acl = scoutfs_get_acl(dentry->d_inode, type);
#endif
if (IS_ERR(acl))
return PTR_ERR(acl);
if (acl == NULL)
@@ -286,7 +305,11 @@ int scoutfs_acl_set_xattr(struct dentry *dentry, const char *name, const void *v
}
}
#ifdef KC_GET_ACL_DENTRY
ret = scoutfs_set_acl(KC_VFS_INIT_NS dentry, acl, type);
#else
ret = scoutfs_set_acl(dentry->d_inode, acl, type);
#endif
out:
posix_acl_release(acl);

7
kmod/src/acl.h
View File

@@ -1,9 +1,14 @@
#ifndef _SCOUTFS_ACL_H_
#define _SCOUTFS_ACL_H_
#ifdef KC_GET_ACL_DENTRY
struct posix_acl *scoutfs_get_acl(KC_VFS_NS_DEF struct dentry *dentry, int type);
int scoutfs_set_acl(KC_VFS_NS_DEF struct dentry *dentry, struct posix_acl *acl, int type);
#else
struct posix_acl *scoutfs_get_acl(struct inode *inode, int type);
struct posix_acl *scoutfs_get_acl_locked(struct inode *inode, int type, struct scoutfs_lock *lock);
int scoutfs_set_acl(struct inode *inode, struct posix_acl *acl, int type);
#endif
struct posix_acl *scoutfs_get_acl_locked(struct inode *inode, int type, struct scoutfs_lock *lock);
int scoutfs_set_acl_locked(struct inode *inode, struct posix_acl *acl, int type,
struct scoutfs_lock *lock, struct list_head *ind_locks);
#ifdef KC_XATTR_STRUCT_XATTR_HANDLER

3
kmod/src/dir.c
View File

@@ -2053,6 +2053,9 @@ const struct inode_operations scoutfs_dir_iops = {
#endif
.listxattr = scoutfs_listxattr,
.get_acl = scoutfs_get_acl,
#ifdef KC_GET_ACL_DENTRY
.set_acl = scoutfs_set_acl,
#endif
.symlink = scoutfs_symlink,
.permission = scoutfs_permission,
#ifdef KC_LINUX_HAVE_RHEL_IOPS_WRAPPER

6
kmod/src/inode.c
View File

@@ -150,6 +150,9 @@ static const struct inode_operations scoutfs_file_iops = {
#endif
.listxattr = scoutfs_listxattr,
.get_acl = scoutfs_get_acl,
#ifdef KC_GET_ACL_DENTRY
.set_acl = scoutfs_set_acl,
#endif
.fiemap = scoutfs_data_fiemap,
};
@@ -163,6 +166,9 @@ static const struct inode_operations scoutfs_special_iops = {
#endif
.listxattr = scoutfs_listxattr,
.get_acl = scoutfs_get_acl,
#ifdef KC_GET_ACL_DENTRY
.set_acl = scoutfs_set_acl,
#endif
};
/*