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Mon, 09 Feb 2026 13:22:32 -0800 (PST) From: Bhavik Sachdev To: Alejandro Colomar Cc: Bhavik Sachdev , linux-man@vger.kernel.org, criu@lists.linux.dev, Andrei Vagin , Pavel Tikhomirov , Jeff Layton , Miklos Szeredi , Josef Bacik , Christian Brauner Subject: [PATCH v1 07/10] man/man2/statmount.2: Document STATMOUNT_{UIDMAP,GIDMAP} Date: Tue, 10 Feb 2026 02:47:40 +0530 Message-ID: X-Mailer: git-send-email 2.53.0 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-man@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Document the STATMOUNT_{UIDMAP,GIDMAP} flags and the corresponding fields introduced by them. Most of this is based on the commit message provided here [1]. Link [1]: Signed-off-by: Bhavik Sachdev --- man/man2/statmount.2 | 34 ++++++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+) diff --git a/man/man2/statmount.2 b/man/man2/statmount.2 index b7acde8f4..4da55eb38 100644 --- a/man/man2/statmount.2 +++ b/man/man2/statmount.2 @@ -56,6 +56,10 @@ .SH SYNOPSIS .B " __u32 opt_array;" .B " __u32 opt_sec_num;" .B " __u32 opt_sec_array;" +.B " __u32 mnt_uidmap_num;" +.B " __u32 mnt_uidmap;" +.B " __u32 mnt_gidmap_num;" +.B " __u32 mnt_gidmap;" .B " char str[];" .B }; .EE @@ -120,6 +124,8 @@ .SS The mnt_id_req structure STATMOUNT_SB_SOURCE /* Want/got sb_source */ STATMOUNT_OPT_ARRAY /* Want/got opt_... */ STATMOUNT_OPT_SEC_ARRAY /* Want/got opt_sec... */ +STATMOUNT_MNT_UIDMAP /* Want/got uidmap... */ +STATMOUNT_MNT_GIDMAP /* Want/got gidmap... */ .TE .in .P @@ -299,6 +305,34 @@ .SS The returned information buffer that contains security options separated by null bytes. They can be iterated over the help of .IR smbuf.opt_sec_num . +.TP +.I smbuf.mnt_uidmap_num +The number of uid mappings in case of an idmapped mount. +If STATMOUNT_UIDMAP was not unset and this field is 0, +the mount is not an idmapped mount. +.TP +.I smbuf.mnt_uidmap +The offset to the location in the +.I smbuf.str +buffer that contains uid mappings as string array separated by null bytes. +They can be iterated over with the help of +.IR smbuf.mnt_uidmap_num . +The whole range of uid mappings must be resolvable inthe caller's user +namespace. +.TP +.I smbuf.mnt_gidmap_num +The number of gid mappings in case of an idmapped mount. +If STATMOUNT_GIDMAP was not unset and this field is 0, +the mount is not an idmapped mount. +.TP +.I smbuf.mnt_gidmap +The offset to the location in the +.I smbuf.str +buffer that contains uid mappings as string array separated by null bytes. +They can be iterated over with the help of +.IR smbuf.mnt_gidmap_num . +The whole range of gid mappings must be resolvable in the caller's user +namespace. .SH RETURN VALUE On success, zero is returned. On error, \-1 is returned, and -- 2.53.0