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From: Amir Goldstein <amir73il@gmail.com>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Sasha Levin <sashal@kernel.org>,
	Miklos Szeredi <miklos@szeredi.hu>, Jan Kara <jack@suse.cz>,
	Dmitry Safonov <dima@arista.com>,
	Ignat Korchagin <ignat@cloudflare.com>,
	linux-fsdevel@vger.kernel.org, linux-unionfs@vger.kernel.org,
	stable@vger.kernel.org, Christian Brauner <brauner@kernel.org>
Subject: [PATCH 6.6 1/3] ovl: pass realinode to ovl_encode_real_fh() instead of realdentry
Date: Tue, 21 Jan 2025 12:08:13 +0100	[thread overview]
Message-ID: <20250121110815.416785-2-amir73il@gmail.com> (raw)
In-Reply-To: <20250121110815.416785-1-amir73il@gmail.com>

[ Upstream commit 07aeefae7ff44d80524375253980b1bdee2396b0 ]

We want to be able to encode an fid from an inode with no alias.

Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Link: https://lore.kernel.org/r/20250105162404.357058-2-amir73il@gmail.com
Signed-off-by: Christian Brauner <brauner@kernel.org>
Stable-dep-of: c45beebfde34 ("ovl: support encoding fid from inode with no alias")
Signed-off-by: Sasha Levin <sashal@kernel.org>
[re-applied over v6.6.71 with conflict resolved]
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
---
 fs/overlayfs/copy_up.c   | 11 ++++++-----
 fs/overlayfs/export.c    |  5 +++--
 fs/overlayfs/namei.c     |  4 ++--
 fs/overlayfs/overlayfs.h |  2 +-
 4 files changed, 12 insertions(+), 10 deletions(-)

diff --git a/fs/overlayfs/copy_up.c b/fs/overlayfs/copy_up.c
index ada3fcc9c6d50..e97bcf15c689c 100644
--- a/fs/overlayfs/copy_up.c
+++ b/fs/overlayfs/copy_up.c
@@ -371,13 +371,13 @@ int ovl_set_attr(struct ovl_fs *ofs, struct dentry *upperdentry,
 	return err;
 }
 
-struct ovl_fh *ovl_encode_real_fh(struct ovl_fs *ofs, struct dentry *real,
+struct ovl_fh *ovl_encode_real_fh(struct ovl_fs *ofs, struct inode *realinode,
 				  bool is_upper)
 {
 	struct ovl_fh *fh;
 	int fh_type, dwords;
 	int buflen = MAX_HANDLE_SZ;
-	uuid_t *uuid = &real->d_sb->s_uuid;
+	uuid_t *uuid = &realinode->i_sb->s_uuid;
 	int err;
 
 	/* Make sure the real fid stays 32bit aligned */
@@ -394,7 +394,8 @@ struct ovl_fh *ovl_encode_real_fh(struct ovl_fs *ofs, struct dentry *real,
 	 * the price or reconnecting the dentry.
 	 */
 	dwords = buflen >> 2;
-	fh_type = exportfs_encode_fh(real, (void *)fh->fb.fid, &dwords, 0);
+	fh_type = exportfs_encode_inode_fh(realinode, (void *)fh->fb.fid,
+					   &dwords, NULL, 0);
 	buflen = (dwords << 2);
 
 	err = -EIO;
@@ -438,7 +439,7 @@ int ovl_set_origin(struct ovl_fs *ofs, struct dentry *lower,
 	 * up and a pure upper inode.
 	 */
 	if (ovl_can_decode_fh(lower->d_sb)) {
-		fh = ovl_encode_real_fh(ofs, lower, false);
+		fh = ovl_encode_real_fh(ofs, d_inode(lower), false);
 		if (IS_ERR(fh))
 			return PTR_ERR(fh);
 	}
@@ -461,7 +462,7 @@ static int ovl_set_upper_fh(struct ovl_fs *ofs, struct dentry *upper,
 	const struct ovl_fh *fh;
 	int err;
 
-	fh = ovl_encode_real_fh(ofs, upper, true);
+	fh = ovl_encode_real_fh(ofs, d_inode(upper), true);
 	if (IS_ERR(fh))
 		return PTR_ERR(fh);
 
diff --git a/fs/overlayfs/export.c b/fs/overlayfs/export.c
index 611ff567a1aa6..c56e4e0b8054c 100644
--- a/fs/overlayfs/export.c
+++ b/fs/overlayfs/export.c
@@ -228,6 +228,7 @@ static int ovl_check_encode_origin(struct dentry *dentry)
 static int ovl_dentry_to_fid(struct ovl_fs *ofs, struct dentry *dentry,
 			     u32 *fid, int buflen)
 {
+	struct inode *inode = d_inode(dentry);
 	struct ovl_fh *fh = NULL;
 	int err, enc_lower;
 	int len;
@@ -241,8 +242,8 @@ static int ovl_dentry_to_fid(struct ovl_fs *ofs, struct dentry *dentry,
 		goto fail;
 
 	/* Encode an upper or lower file handle */
-	fh = ovl_encode_real_fh(ofs, enc_lower ? ovl_dentry_lower(dentry) :
-				ovl_dentry_upper(dentry), !enc_lower);
+	fh = ovl_encode_real_fh(ofs, enc_lower ? ovl_inode_lower(inode) :
+				ovl_inode_upper(inode), !enc_lower);
 	if (IS_ERR(fh))
 		return PTR_ERR(fh);
 
diff --git a/fs/overlayfs/namei.c b/fs/overlayfs/namei.c
index 80391c687c2ad..273a39d3e9513 100644
--- a/fs/overlayfs/namei.c
+++ b/fs/overlayfs/namei.c
@@ -523,7 +523,7 @@ int ovl_verify_set_fh(struct ovl_fs *ofs, struct dentry *dentry,
 	struct ovl_fh *fh;
 	int err;
 
-	fh = ovl_encode_real_fh(ofs, real, is_upper);
+	fh = ovl_encode_real_fh(ofs, d_inode(real), is_upper);
 	err = PTR_ERR(fh);
 	if (IS_ERR(fh)) {
 		fh = NULL;
@@ -720,7 +720,7 @@ int ovl_get_index_name(struct ovl_fs *ofs, struct dentry *origin,
 	struct ovl_fh *fh;
 	int err;
 
-	fh = ovl_encode_real_fh(ofs, origin, false);
+	fh = ovl_encode_real_fh(ofs, d_inode(origin), false);
 	if (IS_ERR(fh))
 		return PTR_ERR(fh);
 
diff --git a/fs/overlayfs/overlayfs.h b/fs/overlayfs/overlayfs.h
index 09ca82ed0f8ce..981967e507b3e 100644
--- a/fs/overlayfs/overlayfs.h
+++ b/fs/overlayfs/overlayfs.h
@@ -821,7 +821,7 @@ int ovl_copy_up_with_data(struct dentry *dentry);
 int ovl_maybe_copy_up(struct dentry *dentry, int flags);
 int ovl_copy_xattr(struct super_block *sb, const struct path *path, struct dentry *new);
 int ovl_set_attr(struct ovl_fs *ofs, struct dentry *upper, struct kstat *stat);
-struct ovl_fh *ovl_encode_real_fh(struct ovl_fs *ofs, struct dentry *real,
+struct ovl_fh *ovl_encode_real_fh(struct ovl_fs *ofs, struct inode *realinode,
 				  bool is_upper);
 int ovl_set_origin(struct ovl_fs *ofs, struct dentry *lower,
 		   struct dentry *upper);
-- 
2.34.1


  reply	other threads:[~2025-01-21 11:08 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-01-21 11:08 [PATCH 6.6 0/3] Manual backport of overlayfs fixes from v6.6.72 Amir Goldstein
2025-01-21 11:08 ` Amir Goldstein [this message]
2025-01-21 11:08 ` [PATCH 6.6 2/3] ovl: support encoding fid from inode with no alias Amir Goldstein
2025-01-21 11:08 ` [PATCH 6.6 3/3] fs: relax assertions on failure to encode file handles Amir Goldstein
2025-01-21 11:14 ` [PATCH 6.6 0/3] Manual backport of overlayfs fixes from v6.6.72 Amir Goldstein
2025-01-21 11:21   ` Greg Kroah-Hartman

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