linux-ext4 - [PATCH v8 5/8] ceph: report the inode version in getattr if requested

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Date:   Fri, 21 Oct 2022 09:05:59 -0400
From:   Jeff Layton <jlayton@...nel.org>
To:     tytso@....edu, adilger.kernel@...ger.ca, djwong@...nel.org,
        david@...morbit.com, trondmy@...merspace.com, neilb@...e.de,
        viro@...iv.linux.org.uk, zohar@...ux.ibm.com, xiubli@...hat.com,
        chuck.lever@...cle.com, lczerner@...hat.com, jack@...e.cz,
        bfields@...ldses.org, brauner@...nel.org, fweimer@...hat.com
Cc:     linux-btrfs@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, ceph-devel@...r.kernel.org,
        linux-ext4@...r.kernel.org, linux-nfs@...r.kernel.org,
        linux-xfs@...r.kernel.org
Subject: [PATCH v8 5/8] ceph: report the inode version in getattr if requested

When getattr requests the STX_CHANGE_COOKIE, request the full gamut of
caps (similarly to how ctime is handled). When the change attribute
seems to be valid, return it in the change_cookie field and set the flag
in the reply mask. Also, unconditionally enable
STATX_ATTR_CHANGE_MONOTONIC.

Reviewed-by: Xiubo Li <xiubli@...hat.com>
Signed-off-by: Jeff Layton <jlayton@...nel.org>
---
 fs/ceph/inode.c | 16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)

diff --git a/fs/ceph/inode.c b/fs/ceph/inode.c
index 4af5e55abc15..0e2e6ca399a9 100644
--- a/fs/ceph/inode.c
+++ b/fs/ceph/inode.c
@@ -2417,10 +2417,10 @@ static int statx_to_caps(u32 want, umode_t mode)
 {
 	int mask = 0;
 
-	if (want & (STATX_MODE|STATX_UID|STATX_GID|STATX_CTIME|STATX_BTIME))
+	if (want & (STATX_MODE|STATX_UID|STATX_GID|STATX_CTIME|STATX_BTIME|STATX_CHANGE_COOKIE))
 		mask |= CEPH_CAP_AUTH_SHARED;
 
-	if (want & (STATX_NLINK|STATX_CTIME)) {
+	if (want & (STATX_NLINK|STATX_CTIME|STATX_CHANGE_COOKIE)) {
 		/*
 		 * The link count for directories depends on inode->i_subdirs,
 		 * and that is only updated when Fs caps are held.
@@ -2431,11 +2431,10 @@ static int statx_to_caps(u32 want, umode_t mode)
 			mask |= CEPH_CAP_LINK_SHARED;
 	}
 
-	if (want & (STATX_ATIME|STATX_MTIME|STATX_CTIME|STATX_SIZE|
-		    STATX_BLOCKS))
+	if (want & (STATX_ATIME|STATX_MTIME|STATX_CTIME|STATX_SIZE|STATX_BLOCKS|STATX_CHANGE_COOKIE))
 		mask |= CEPH_CAP_FILE_SHARED;
 
-	if (want & (STATX_CTIME))
+	if (want & (STATX_CTIME|STATX_CHANGE_COOKIE))
 		mask |= CEPH_CAP_XATTR_SHARED;
 
 	return mask;
@@ -2478,6 +2477,11 @@ int ceph_getattr(struct user_namespace *mnt_userns, const struct path *path,
 		valid_mask |= STATX_BTIME;
 	}
 
+	if (request_mask & STATX_CHANGE_COOKIE) {
+		stat->change_cookie = inode_peek_iversion_raw(inode);
+		valid_mask |= STATX_CHANGE_COOKIE;
+	}
+
 	if (ceph_snap(inode) == CEPH_NOSNAP)
 		stat->dev = sb->s_dev;
 	else
@@ -2519,6 +2523,8 @@ int ceph_getattr(struct user_namespace *mnt_userns, const struct path *path,
 			stat->nlink = 1 + 1 + ci->i_subdirs;
 	}
 
+	stat->attributes_mask |= STATX_ATTR_CHANGE_MONOTONIC;
+	stat->attributes |= STATX_ATTR_CHANGE_MONOTONIC;
 	stat->result_mask = request_mask & valid_mask;
 	return err;
 }
-- 
2.37.3