[PATCH 8/9] man/man2/statmount.2: Document STATMOUNT_SUPPORTED_MASK

Document STATMOUNT_SUPPORTED_MASK flag and the corresponding field
introduced by it. It is used to determine the flags supported by the
current kernel. The text is based on this commit message [1].

Link [1]:
<https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=8f6116b5b77b0536d2ad7482ee42bfe58b8fac01>

Signed-off-by: Bhavik Sachdev <[email protected]>
---
 man/man2/statmount.2 | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/man/man2/statmount.2 b/man/man2/statmount.2
index 4ae609818..79ee752c1 100644
--- a/man/man2/statmount.2
+++ b/man/man2/statmount.2
@@ -60,6 +60,7 @@ .SH SYNOPSIS
 .B "    __u32  mnt_uidmap;"
 .B "    __u32  mnt_gidmap_num;"
 .B "    __u32  mnt_gidmap;"
+.B "    __u64  supported_mask;"
 .B "    char   str[];"
 .B };
 .EE
@@ -126,6 +127,7 @@ .SS The mnt_id_req structure
 STATMOUNT_OPT_SEC_ARRAY	/* Want/got opt_sec... */
 STATMOUNT_MNT_UIDMAP	/* Want/got uidmap... */
 STATMOUNT_MNT_GIDMAP	/* Want/got gidmap... */
+STATMOUNT_SUPPORTED_MASK	/* Want/got supported mask flags */
 .TE
 .in
 .P
@@ -313,6 +315,7 @@ .SS The returned information
 They can be iterated over the help of
 .IR smbuf.opt_sec_num .
 .TP
+.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.
@@ -340,6 +343,12 @@ .SS The returned information
 .IR smbuf.mnt_gidmap_num .
 The whole range of gid mappings must be resolvable in the caller's user namespace.
 .TP
+.TP
+.I smbuf.supported_mask
+The ORed combination of
+.BI STATMOUNT_ *
+flags supported by the current kernel.
+.TP
 .SH RETURN VALUE
 On success, zero is returned.
 On error, \-1 is returned, and
-- 
2.52.0