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authorIvan Babrou <ivan@cloudflare.com>2023-07-31 20:47:31 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2023-08-05 08:32:39 +0200
commit0ce7c12e88cfa3e4cb0800e8172e5befea5c199a (patch)
treea9b2c34ddbd5f787977eacbf69830410c1ab9256 /fs/kernfs
parentkernfs: add stub helper for kernfs_generic_poll() (diff)
downloadlinux-0ce7c12e88cfa3e4cb0800e8172e5befea5c199a.tar.xz
linux-0ce7c12e88cfa3e4cb0800e8172e5befea5c199a.zip
kernfs: attach uuid for every kernfs and report it in fsid
The following two commits added the same thing for tmpfs: * commit 2b4db79618ad ("tmpfs: generate random sb->s_uuid") * commit 59cda49ecf6c ("shmem: allow reporting fanotify events with file handles on tmpfs") Having fsid allows using fanotify, which is especially handy for cgroups, where one might be interested in knowing when they are created or removed. Signed-off-by: Ivan Babrou <ivan@cloudflare.com> Acked-by: Jan Kara <jack@suse.cz> Acked-by: Christian Brauner <brauner@kernel.org> Link: https://lore.kernel.org/r/20230731184731.64568-1-ivan@cloudflare.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs/kernfs')
-rw-r--r--fs/kernfs/mount.c13
1 files changed, 12 insertions, 1 deletions
diff --git a/fs/kernfs/mount.c b/fs/kernfs/mount.c
index d49606accb07..c4bf26142eec 100644
--- a/fs/kernfs/mount.c
+++ b/fs/kernfs/mount.c
@@ -16,6 +16,8 @@
#include <linux/namei.h>
#include <linux/seq_file.h>
#include <linux/exportfs.h>
+#include <linux/uuid.h>
+#include <linux/statfs.h>
#include "kernfs-internal.h"
@@ -45,8 +47,15 @@ static int kernfs_sop_show_path(struct seq_file *sf, struct dentry *dentry)
return 0;
}
+static int kernfs_statfs(struct dentry *dentry, struct kstatfs *buf)
+{
+ simple_statfs(dentry, buf);
+ buf->f_fsid = uuid_to_fsid(dentry->d_sb->s_uuid.b);
+ return 0;
+}
+
const struct super_operations kernfs_sops = {
- .statfs = simple_statfs,
+ .statfs = kernfs_statfs,
.drop_inode = generic_delete_inode,
.evict_inode = kernfs_evict_inode,
@@ -351,6 +360,8 @@ int kernfs_get_tree(struct fs_context *fc)
}
sb->s_flags |= SB_ACTIVE;
+ uuid_gen(&sb->s_uuid);
+
down_write(&root->kernfs_supers_rwsem);
list_add(&info->node, &info->root->supers);
up_write(&root->kernfs_supers_rwsem);