Re: [GIT PULL] Ceph updates for -rc1

[Sage Weil <sage@inktank.com>]

On Tue, 28 Jan 2014, Sage Weil wrote:
> Hi Linus,
> 
> On Tue, 28 Jan 2014, Linus Torvalds wrote:
> > On Tue, Jan 28, 2014 at 1:10 PM, Dave Jones <davej@redhat.com> wrote:
> > >
> > > This breaks the build for me.
> > 
> > It is my merge (Christoph's ACL changes came in today through the VFS
> > tree from Al).
> > 
> > I was doing the merges today on my laptop (I had jury duty yesterday
> > and today), and so I didn't do the allmodconfig build I would normally
> > do on my (much faster) desktop. Well, actually I did do the full fs
> > builds for the earlier pulls that actually had some conflicts, but not
> > for the ceph pull. The conflict was hidden by the fact that the whole
> > cifs ACL support is new, so there was no data conflict, just a silent
> > semantic conflict between the new smarter ACL helpers and the new ACL
> > use in CIFS.
> 
> s/cifs/ceph/ :)
> 
> > I'm back home now (yay, all the afternoon cases got settled), and I
> > see the problem now. I should have done an allmodconfig build
> > immediately after coming home, but I never even thought of it.
> >
> > Anyway, here's an *untested* conversion to the new posix acl helper
> > infrastructure. I do wonder if ceph_init_acl() could be converted to
> > posix_acl_create(), right now that part is a "non-conversion" - it's
> > just made to use __posix_acl_create() that implements the old
> > interface.
> > 
> > Al, Christoph, can you please check my conversion for sanity from a
> > generic posix-acl standpoint?
> > 
> > Sage, Guangliang, Li, can you check the actual cifs usage/sanity of
> > the attached patch?
> 
> Superficially at least the conversion looks okay to me, but it's not 
> passing my smoke test (it's giving me EOPNOTSUPP for chmod and setxattr 
> when setting an ACL).  I'll look at it tomorrow if Guangliang, Li, or Yan 
> don't get there first.

The set_acl inode_operation wasn't getting set, and the prototype needed 
to be adjusted a bit (it doesn't take a dentry anymore).  All seems to be 
well with the below patch.

Thanks!
sage


>From 01baa54e113060eb9147548fe7beb572522a645a Mon Sep 17 00:00:00 2001
From: Sage Weil <sage@inktank.com>
Date: Wed, 29 Jan 2014 06:22:25 -0800
Subject: [PATCH] ceph: fix posix ACL hooks

The merge of 7221fe4c2 raced with upstream changes in the generic POSIX
ACL code (2aeccbe95).  Update Ceph to use the new helpers as well by
dropping the now-generic functions and setting the set_acl inode op.

Signed-off-by: Sage Weil <sage@inktank.com>
---
 fs/ceph/acl.c   | 112 +++-----------------------------------------------------
 fs/ceph/dir.c   |   1 +
 fs/ceph/inode.c |   5 ++-
 fs/ceph/super.h |   5 +--
 fs/ceph/xattr.c |   5 ++-
 5 files changed, 15 insertions(+), 113 deletions(-)

diff --git a/fs/ceph/acl.c b/fs/ceph/acl.c
index 64fddbc..66d377a 100644
--- a/fs/ceph/acl.c
+++ b/fs/ceph/acl.c
@@ -107,14 +107,14 @@ struct posix_acl *ceph_get_acl(struct inode *inode, int type)
 	return acl;
 }
 
-static int ceph_set_acl(struct dentry *dentry, struct inode *inode,
-				struct posix_acl *acl, int type)
+int ceph_set_acl(struct inode *inode, struct posix_acl *acl, int type)
 {
 	int ret = 0, size = 0;
 	const char *name = NULL;
 	char *value = NULL;
 	struct iattr newattrs;
 	umode_t new_mode = inode->i_mode, old_mode = inode->i_mode;
+	struct dentry *dentry = d_find_alias(inode);
 
 	if (acl) {
 		ret = posix_acl_valid(acl);
@@ -208,16 +208,15 @@ int ceph_init_acl(struct dentry *dentry, struct inode *inode, struct inode *dir)
 
 	if (IS_POSIXACL(dir) && acl) {
 		if (S_ISDIR(inode->i_mode)) {
-			ret = ceph_set_acl(dentry, inode, acl,
-						ACL_TYPE_DEFAULT);
+			ret = ceph_set_acl(inode, acl, ACL_TYPE_DEFAULT);
 			if (ret)
 				goto out_release;
 		}
-		ret = posix_acl_create(&acl, GFP_NOFS, &inode->i_mode);
+		ret = __posix_acl_create(&acl, GFP_NOFS, &inode->i_mode);
 		if (ret < 0)
 			goto out;
 		else if (ret > 0)
-			ret = ceph_set_acl(dentry, inode, acl, ACL_TYPE_ACCESS);
+			ret = ceph_set_acl(inode, acl, ACL_TYPE_ACCESS);
 		else
 			cache_no_acl(inode);
 	} else {
@@ -229,104 +228,3 @@ out_release:
 out:
 	return ret;
 }
-
-int ceph_acl_chmod(struct dentry *dentry, struct inode *inode)
-{
-	struct posix_acl *acl;
-	int ret = 0;
-
-	if (S_ISLNK(inode->i_mode)) {
-		ret = -EOPNOTSUPP;
-		goto out;
-	}
-
-	if (!IS_POSIXACL(inode))
-		goto out;
-
-	acl = ceph_get_acl(inode, ACL_TYPE_ACCESS);
-	if (IS_ERR_OR_NULL(acl)) {
-		ret = PTR_ERR(acl);
-		goto out;
-	}
-
-	ret = posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode);
-	if (ret)
-		goto out;
-	ret = ceph_set_acl(dentry, inode, acl, ACL_TYPE_ACCESS);
-	posix_acl_release(acl);
-out:
-	return ret;
-}
-
-static int ceph_xattr_acl_get(struct dentry *dentry, const char *name,
-				void *value, size_t size, int type)
-{
-	struct posix_acl *acl;
-	int ret = 0;
-
-	if (!IS_POSIXACL(dentry->d_inode))
-		return -EOPNOTSUPP;
-
-	acl = ceph_get_acl(dentry->d_inode, type);
-	if (IS_ERR(acl))
-		return PTR_ERR(acl);
-	if (acl == NULL)
-		return -ENODATA;
-
-	ret = posix_acl_to_xattr(&init_user_ns, acl, value, size);
-	posix_acl_release(acl);
-
-	return ret;
-}
-
-static int ceph_xattr_acl_set(struct dentry *dentry, const char *name,
-			const void *value, size_t size, int flags, int type)
-{
-	int ret = 0;
-	struct posix_acl *acl = NULL;
-
-	if (!inode_owner_or_capable(dentry->d_inode)) {
-		ret = -EPERM;
-		goto out;
-	}
-
-	if (!IS_POSIXACL(dentry->d_inode)) {
-		ret = -EOPNOTSUPP;
-		goto out;
-	}
-
-	if (value) {
-		acl = posix_acl_from_xattr(&init_user_ns, value, size);
-		if (IS_ERR(acl)) {
-			ret = PTR_ERR(acl);
-			goto out;
-		}
-
-		if (acl) {
-			ret = posix_acl_valid(acl);
-			if (ret)
-				goto out_release;
-		}
-	}
-
-	ret = ceph_set_acl(dentry, dentry->d_inode, acl, type);
-
-out_release:
-	posix_acl_release(acl);
-out:
-	return ret;
-}
-
-const struct xattr_handler ceph_xattr_acl_default_handler = {
-	.prefix = POSIX_ACL_XATTR_DEFAULT,
-	.flags  = ACL_TYPE_DEFAULT,
-	.get    = ceph_xattr_acl_get,
-	.set    = ceph_xattr_acl_set,
-};
-
-const struct xattr_handler ceph_xattr_acl_access_handler = {
-	.prefix = POSIX_ACL_XATTR_ACCESS,
-	.flags  = ACL_TYPE_ACCESS,
-	.get    = ceph_xattr_acl_get,
-	.set    = ceph_xattr_acl_set,
-};
diff --git a/fs/ceph/dir.c b/fs/ceph/dir.c
index 619616d..6da4df8 100644
--- a/fs/ceph/dir.c
+++ b/fs/ceph/dir.c
@@ -1303,6 +1303,7 @@ const struct inode_operations ceph_dir_iops = {
 	.listxattr = ceph_listxattr,
 	.removexattr = ceph_removexattr,
 	.get_acl = ceph_get_acl,
+	.set_acl = ceph_set_acl,
 	.mknod = ceph_mknod,
 	.symlink = ceph_symlink,
 	.mkdir = ceph_mkdir,
diff --git a/fs/ceph/inode.c b/fs/ceph/inode.c
index 6fc10a7..32d519d 100644
--- a/fs/ceph/inode.c
+++ b/fs/ceph/inode.c
@@ -9,6 +9,7 @@
 #include <linux/namei.h>
 #include <linux/writeback.h>
 #include <linux/vmalloc.h>
+#include <linux/posix_acl.h>
 
 #include "super.h"
 #include "mds_client.h"
@@ -96,6 +97,7 @@ const struct inode_operations ceph_file_iops = {
 	.listxattr = ceph_listxattr,
 	.removexattr = ceph_removexattr,
 	.get_acl = ceph_get_acl,
+	.set_acl = ceph_set_acl,
 };
 
 
@@ -1615,6 +1617,7 @@ static const struct inode_operations ceph_symlink_iops = {
 	.listxattr = ceph_listxattr,
 	.removexattr = ceph_removexattr,
 	.get_acl = ceph_get_acl,
+	.set_acl = ceph_set_acl,
 };
 
 /*
@@ -1805,7 +1808,7 @@ int ceph_setattr(struct dentry *dentry, struct iattr *attr)
 		__mark_inode_dirty(inode, inode_dirty_flags);
 
 	if (ia_valid & ATTR_MODE) {
-		err = ceph_acl_chmod(dentry, inode);
+		err = posix_acl_chmod(inode, attr->ia_mode);
 		if (err)
 			goto out_put;
 	}
diff --git a/fs/ceph/super.h b/fs/ceph/super.h
index c299f7d..eabf601 100644
--- a/fs/ceph/super.h
+++ b/fs/ceph/super.h
@@ -718,6 +718,7 @@ extern void ceph_queue_writeback(struct inode *inode);
 extern int ceph_do_getattr(struct inode *inode, int mask);
 extern int ceph_permission(struct inode *inode, int mask);
 extern int ceph_setattr(struct dentry *dentry, struct iattr *attr);
+extern int ceph_setattr(struct dentry *dentry, struct iattr *attr);
 extern int ceph_getattr(struct vfsmount *mnt, struct dentry *dentry,
 			struct kstat *stat);
 
@@ -736,15 +737,13 @@ extern void __init ceph_xattr_init(void);
 extern void ceph_xattr_exit(void);
 
 /* acl.c */
-extern const struct xattr_handler ceph_xattr_acl_access_handler;
-extern const struct xattr_handler ceph_xattr_acl_default_handler;
 extern const struct xattr_handler *ceph_xattr_handlers[];
 
 #ifdef CONFIG_CEPH_FS_POSIX_ACL
 
 struct posix_acl *ceph_get_acl(struct inode *, int);
+int ceph_set_acl(struct inode *inode, struct posix_acl *acl, int type);
 int ceph_init_acl(struct dentry *, struct inode *, struct inode *);
-int ceph_acl_chmod(struct dentry *, struct inode *);
 void ceph_forget_all_cached_acls(struct inode *inode);
 
 #else
diff --git a/fs/ceph/xattr.c b/fs/ceph/xattr.c
index c7581f37..898b656 100644
--- a/fs/ceph/xattr.c
+++ b/fs/ceph/xattr.c
@@ -6,6 +6,7 @@
 #include <linux/ceph/decode.h>
 
 #include <linux/xattr.h>
+#include <linux/posix_acl_xattr.h>
 #include <linux/slab.h>
 
 #define XATTR_CEPH_PREFIX "ceph."
@@ -17,8 +18,8 @@
  */
 const struct xattr_handler *ceph_xattr_handlers[] = {
 #ifdef CONFIG_CEPH_FS_POSIX_ACL
-	&ceph_xattr_acl_access_handler,
-	&ceph_xattr_acl_default_handler,
+	&posix_acl_access_xattr_handler,
+	&posix_acl_default_xattr_handler,
 #endif
 	NULL,
 };
-- 
1.8.5.1