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Subject[PATCH 19/25] fsinfo: autofs - add sb operation fsinfo() [ver #14]
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Date
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/autofs/inode.c | 64 +++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 64 insertions(+)

diff --git a/fs/autofs/inode.c b/fs/autofs/inode.c
index 58457ec0ab27..53e794ee2aec 100644
--- a/fs/autofs/inode.c
+++ b/fs/autofs/inode.c
@@ -11,6 +11,7 @@
#include <linux/pagemap.h>
#include <linux/fs_context.h>
#include <linux/fs_parser.h>
+#include <linux/fsinfo.h>

#include "autofs_i.h"

@@ -101,6 +102,66 @@ static int autofs_show_options(struct seq_file *m, struct dentry *root)
return 0;
}

+#ifdef CONFIG_FSINFO
+/*
+ * Get filesystem information.
+ */
+static int autofs_fsinfo(struct path *path, struct fsinfo_kparams *params)
+{
+ struct autofs_sb_info *sbi = autofs_sbi(path->dentry->d_sb);
+ struct inode *inode = d_inode(path->dentry->d_sb->s_root);
+ struct fsinfo_capabilities *caps;
+
+ switch (params->request) {
+ case FSINFO_ATTR_CAPABILITIES:
+ caps = params->buffer;
+ fsinfo_set_cap(caps, FSINFO_CAP_IS_AUTOMOUNTER_FS);
+ fsinfo_set_cap(caps, FSINFO_CAP_AUTOMOUNTS);
+ fsinfo_set_cap(caps, FSINFO_CAP_NOT_PERSISTENT);
+ return sizeof(*caps);
+
+ case FSINFO_ATTR_PARAMETERS:
+ fsinfo_note_sb_params(params, inode->i_sb->s_flags);
+ fsinfo_note_paramf(params, "fd", "%d", sbi->pipefd);
+ if (!uid_eq(inode->i_uid, GLOBAL_ROOT_UID))
+ fsinfo_note_paramf(params, "uid", "%u",
+ from_kuid_munged(&init_user_ns, inode->i_uid));
+ if (!gid_eq(inode->i_gid, GLOBAL_ROOT_GID))
+ fsinfo_note_paramf(params, "gid", "%u",
+ from_kgid_munged(&init_user_ns, inode->i_gid));
+ fsinfo_note_paramf(params, "pgrp", "%d",
+ pid_vnr(sbi->oz_pgrp));
+ fsinfo_note_paramf(params, "timeout", "%lu",
+ sbi->exp_timeout/HZ);
+ fsinfo_note_paramf(params, "minproto", "%d",
+ sbi->min_proto);
+ fsinfo_note_paramf(params, "maxproto", "%d",
+ sbi->max_proto);
+ if (autofs_type_offset(sbi->type))
+ fsinfo_note_param(params, "offset", NULL);
+ else if (autofs_type_direct(sbi->type))
+ fsinfo_note_param(params, "direct", NULL);
+ else
+ fsinfo_note_param(params, "indirect", NULL);
+ if (sbi->flags & AUTOFS_SBI_STRICTEXPIRE)
+ fsinfo_note_param(params, "strictexpire", NULL);
+ if (sbi->flags & AUTOFS_SBI_IGNORE)
+ fsinfo_note_param(params, "ignore", NULL);
+#ifdef CONFIG_CHECKPOINT_RESTORE
+ if (sbi->pipe)
+ fsinfo_note_paramf(params, "pipe_ino",
+ "%ld", file_inode(sbi->pipe)->i_ino);
+ else
+ fsinfo_note_param(params, "pipe_ino", "-1");
+#endif
+ return params->usage;
+
+ default:
+ return generic_fsinfo(path, params);
+ }
+}
+#endif /* CONFIG_FSINFO */
+
static void autofs_evict_inode(struct inode *inode)
{
clear_inode(inode);
@@ -111,6 +172,9 @@ static const struct super_operations autofs_sops = {
.statfs = simple_statfs,
.show_options = autofs_show_options,
.evict_inode = autofs_evict_inode,
+#ifdef CONFIG_FSINFO
+ .fsinfo = autofs_fsinfo,
+#endif
};

struct autofs_fs_context {
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