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authorHridya Valsaraju <hridya@google.com>2019-09-03 09:16:52 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2019-09-04 13:31:13 +0200
commitf00834518ed3194b866f5f3d63b71e0ed7f6bc00 (patch)
treeb854c2df43e4861d563c184131a0199456696873 /drivers/android
parentca2864c6e8965c37df97f11e6f99e83e09806b1c (diff)
binder: add a mount option to show global stats
Currently, all binder state and statistics live in debugfs. We need this information even when debugfs is not mounted. This patch adds the mount option 'stats' to enable a binderfs instance to have binder debug information present in the same. 'stats=global' will enable the global binder statistics. In the future, 'stats=local' will enable binder statistics local to the binderfs instance. The two modes 'global' and 'local' will be mutually exclusive. 'stats=global' option is only available for a binderfs instance mounted in the initial user namespace. An attempt to use the option to mount a binderfs instance in another user namespace will return an EPERM error. Signed-off-by: Hridya Valsaraju <hridya@google.com> Acked-by: Christian Brauner <christian.brauner@ubuntu.com> Link: https://lore.kernel.org/r/20190903161655.107408-2-hridya@google.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/android')
-rw-r--r--drivers/android/binderfs.c45
1 files changed, 43 insertions, 2 deletions
diff --git a/drivers/android/binderfs.c b/drivers/android/binderfs.c
index 55c5adb87585..e54c99bc995f 100644
--- a/drivers/android/binderfs.c
+++ b/drivers/android/binderfs.c
@@ -51,18 +51,27 @@ static DEFINE_IDA(binderfs_minors);
/**
* binderfs_mount_opts - mount options for binderfs
* @max: maximum number of allocatable binderfs binder devices
+ * @stats_mode: enable binder stats in binderfs.
*/
struct binderfs_mount_opts {
int max;
+ int stats_mode;
};
enum {
Opt_max,
+ Opt_stats_mode,
Opt_err
};
+enum binderfs_stats_mode {
+ STATS_NONE,
+ STATS_GLOBAL,
+};
+
static const match_table_t tokens = {
{ Opt_max, "max=%d" },
+ { Opt_stats_mode, "stats=%s" },
{ Opt_err, NULL }
};
@@ -290,8 +299,9 @@ static void binderfs_evict_inode(struct inode *inode)
static int binderfs_parse_mount_opts(char *data,
struct binderfs_mount_opts *opts)
{
- char *p;
+ char *p, *stats;
opts->max = BINDERFS_MAX_MINOR;
+ opts->stats_mode = STATS_NONE;
while ((p = strsep(&data, ",")) != NULL) {
substring_t args[MAX_OPT_ARGS];
@@ -311,6 +321,22 @@ static int binderfs_parse_mount_opts(char *data,
opts->max = max_devices;
break;
+ case Opt_stats_mode:
+ if (!capable(CAP_SYS_ADMIN))
+ return -EINVAL;
+
+ stats = match_strdup(&args[0]);
+ if (!stats)
+ return -ENOMEM;
+
+ if (strcmp(stats, "global") != 0) {
+ kfree(stats);
+ return -EINVAL;
+ }
+
+ opts->stats_mode = STATS_GLOBAL;
+ kfree(stats);
+ break;
default:
pr_err("Invalid mount options\n");
return -EINVAL;
@@ -322,8 +348,21 @@ static int binderfs_parse_mount_opts(char *data,
static int binderfs_remount(struct super_block *sb, int *flags, char *data)
{
+ int prev_stats_mode, ret;
struct binderfs_info *info = sb->s_fs_info;
- return binderfs_parse_mount_opts(data, &info->mount_opts);
+
+ prev_stats_mode = info->mount_opts.stats_mode;
+ ret = binderfs_parse_mount_opts(data, &info->mount_opts);
+ if (ret)
+ return ret;
+
+ if (prev_stats_mode != info->mount_opts.stats_mode) {
+ pr_err("Binderfs stats mode cannot be changed during a remount\n");
+ info->mount_opts.stats_mode = prev_stats_mode;
+ return -EINVAL;
+ }
+
+ return 0;
}
static int binderfs_show_mount_opts(struct seq_file *seq, struct dentry *root)
@@ -333,6 +372,8 @@ static int binderfs_show_mount_opts(struct seq_file *seq, struct dentry *root)
info = root->d_sb->s_fs_info;
if (info->mount_opts.max <= BINDERFS_MAX_MINOR)
seq_printf(seq, ",max=%d", info->mount_opts.max);
+ if (info->mount_opts.stats_mode == STATS_GLOBAL)
+ seq_printf(seq, ",stats=global");
return 0;
}