From: David Howells <dhowells@redhat.com>
To: viro@zeniv.linux.org.uk
Cc: dhowells@redhat.com, raven@themaw.net, mszeredi@redhat.com,
linux-api@vger.kernel.org, linux-fsdevel@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: [PATCH 18/25] fsinfo: proc - add sb operation fsinfo() [ver #14]
Date: Mon, 24 Jun 2019 15:11:32 +0100 [thread overview]
Message-ID: <156138549291.25627.9442017015199997555.stgit@warthog.procyon.org.uk> (raw)
In-Reply-To: <156138532485.25627.7459410522109581052.stgit@warthog.procyon.org.uk>
From: Ian Kent <raven@themaw.net>
The new fsinfo() system call adds a new super block operation
->fsinfo() which is used by file systems to provide file
system specific information for fsinfo() requests.
The fsinfo() request FSINFO_ATTR_PARAMETERS provides the same
function as sb operation ->show_options() so it needs to be
implemented by any file system that provides ->show_options()
as a minimum.
Also add a simple FSINFO_ATTR_CAPABILITIES implementation.
Signed-off-by: Ian Kent <raven@themaw.net>
Signed-off-by: David Howells <dhowells@redhat.com>
---
fs/proc/inode.c | 37 +++++++++++++++++++++++++++++++++++++
1 file changed, 37 insertions(+)
diff --git a/fs/proc/inode.c b/fs/proc/inode.c
index 5f8d215b3fd0..28c287aff6aa 100644
--- a/fs/proc/inode.c
+++ b/fs/proc/inode.c
@@ -24,6 +24,7 @@
#include <linux/seq_file.h>
#include <linux/slab.h>
#include <linux/mount.h>
+#include <linux/fsinfo.h>
#include <linux/uaccess.h>
@@ -115,6 +116,39 @@ static int proc_show_options(struct seq_file *seq, struct dentry *root)
return 0;
}
+#ifdef CONFIG_FSINFO
+/*
+ * Get filesystem information.
+ */
+static int proc_fsinfo(struct path *path, struct fsinfo_kparams *params)
+{
+ struct super_block *sb = path->dentry->d_sb;
+ struct pid_namespace *pid = sb->s_fs_info;
+ struct fsinfo_capabilities *caps;
+
+ switch (params->request) {
+ case FSINFO_ATTR_CAPABILITIES:
+ caps = params->buffer;
+ fsinfo_set_cap(caps, FSINFO_CAP_IS_KERNEL_FS);
+ fsinfo_set_cap(caps, FSINFO_CAP_NOT_PERSISTENT);
+ return sizeof(*caps);
+
+ case FSINFO_ATTR_PARAMETERS:
+ fsinfo_note_sb_params(params, sb->s_flags);
+ if (!gid_eq(pid->pid_gid, GLOBAL_ROOT_GID))
+ fsinfo_note_paramf(params, "gid", "%u",
+ from_kgid_munged(&init_user_ns, pid->pid_gid));
+ if (pid->hide_pid != HIDEPID_OFF)
+ fsinfo_note_paramf(params, "hidepid",
+ "%u", pid->hide_pid);
+ return params->usage;
+
+ default:
+ return generic_fsinfo(path, params);
+ }
+}
+#endif /* CONFIG_FSINFO */
+
const struct super_operations proc_sops = {
.alloc_inode = proc_alloc_inode,
.free_inode = proc_free_inode,
@@ -122,6 +156,9 @@ const struct super_operations proc_sops = {
.evict_inode = proc_evict_inode,
.statfs = simple_statfs,
.show_options = proc_show_options,
+#ifdef CONFIG_FSINFO
+ .fsinfo = proc_fsinfo,
+#endif
};
enum {BIAS = -1U<<31};
next prev parent reply other threads:[~2019-06-24 14:11 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-24 14:08 [PATCH 00/25] VFS: Introduce filesystem information query syscall [ver #14] David Howells
2019-06-24 14:08 ` [PATCH 01/25] vfs: syscall: Add fsinfo() to query filesystem information " David Howells
2019-06-25 8:28 ` Christian Brauner
2019-06-26 9:49 ` David Howells
2019-06-26 9:58 ` Christian Brauner
2019-06-24 14:09 ` [PATCH 02/25] fsinfo: Add syscalls to other arches " David Howells
2019-06-25 9:31 ` Christian Brauner
2019-06-24 14:09 ` [PATCH 03/25] vfs: Allow fsinfo() to query what's in an fs_context " David Howells
2019-06-25 9:27 ` Christian Brauner
2019-06-26 10:02 ` David Howells
2019-06-26 10:06 ` Christian Brauner
2019-06-24 14:09 ` [PATCH 04/25] vfs: Allow fsinfo() to be used to query an fs parameter description " David Howells
2019-06-25 9:40 ` Christian Brauner
2019-06-24 14:09 ` [PATCH 05/25] vfs: Implement parameter value retrieval with fsinfo() " David Howells
2019-06-25 9:44 ` Christian Brauner
2019-06-24 14:09 ` [PATCH 06/25] fsinfo: Implement retrieval of LSM parameters " David Howells
2019-06-24 14:09 ` [PATCH 07/25] vfs: Introduce a non-repeating system-unique superblock ID " David Howells
2019-06-24 14:09 ` [PATCH 08/25] vfs: Allow fsinfo() to look up a mount object by " David Howells
2019-06-26 9:49 ` Christian Brauner
2019-06-24 14:10 ` [PATCH 09/25] vfs: Add mount notification count " David Howells
2019-06-26 9:52 ` Christian Brauner
2019-06-24 14:10 ` [PATCH 10/25] vfs: Allow mount information to be queried by fsinfo() " David Howells
2019-06-26 9:53 ` Christian Brauner
2019-06-24 14:10 ` [PATCH 11/25] vfs: fsinfo sample: Mount listing program " David Howells
2019-06-24 14:10 ` [PATCH 12/25] fsinfo: Add API documentation " David Howells
2019-06-24 14:10 ` [PATCH 13/25] hugetlbfs: Add support for fsinfo() " David Howells
2019-06-24 14:10 ` [PATCH 14/25] kernfs, cgroup: Add fsinfo support " David Howells
2019-06-24 14:11 ` [PATCH 15/25] fsinfo: Support SELinux superblock parameter retrieval " David Howells
2019-06-24 14:11 ` [PATCH 16/25] fsinfo: Support Smack " David Howells
2019-06-24 14:11 ` [PATCH 17/25] afs: Support fsinfo() " David Howells
2019-06-24 14:11 ` David Howells [this message]
2019-06-24 14:11 ` [PATCH 19/25] fsinfo: autofs - add sb operation " David Howells
2019-06-24 14:11 ` [PATCH 20/25] fsinfo: shmem - add tmpfs " David Howells
2019-06-24 14:11 ` [PATCH 21/25] fsinfo: devpts - add " David Howells
2019-06-24 14:12 ` [PATCH 22/25] fsinfo: pstore " David Howells
2019-06-24 14:12 ` [PATCH 23/25] fsinfo: debugfs " David Howells
2019-06-24 14:12 ` [PATCH 24/25] fsinfo: bpf " David Howells
2019-06-24 14:12 ` [PATCH 25/25] fsinfo: ufs " David Howells
2019-06-26 10:05 ` [PATCH 00/25] VFS: Introduce filesystem information query syscall " Christian Brauner
2019-06-26 10:42 ` Ian Kent
2019-06-26 10:47 ` Christian Brauner
2019-06-27 0:38 ` Ian Kent
2019-06-26 13:19 ` Christian Brauner
2019-06-26 14:31 ` David Howells
2019-06-26 14:50 ` Christian Brauner
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