[PATCHv3 perf/core 5/6] tools lib api fs: Add bpf_fs filesystem detector

[Joe Stringer]

Allow mounting of the BPF filesystem at /sys/fs/bpf.

Signed-off-by: Joe Stringer <j...@ovn.org>
---
v3: Initial post.
---
 tools/lib/api/fs/fs.c | 16 ++++++++++++++++
 tools/lib/api/fs/fs.h |  1 +
 2 files changed, 17 insertions(+)

diff --git a/tools/lib/api/fs/fs.c b/tools/lib/api/fs/fs.c
index f99f49e4a31e..4b6bfc43cccf 100644
--- a/tools/lib/api/fs/fs.c
+++ b/tools/lib/api/fs/fs.c
@@ -38,6 +38,10 @@
 #define HUGETLBFS_MAGIC        0x958458f6
 #endif
 
+#ifndef BPF_FS_MAGIC
+#define BPF_FS_MAGIC           0xcafe4a11
+#endif
+
 static const char * const sysfs__fs_known_mountpoints[] = {
        "/sys",
        0,
@@ -75,6 +79,11 @@ static const char * const hugetlbfs__known_mountpoints[] = {
        0,
 };
 
+static const char * const bpf_fs__known_mountpoints[] = {
+       "/sys/fs/bpf",
+       0,
+};
+
 struct fs {
        const char              *name;
        const char * const      *mounts;
@@ -89,6 +98,7 @@ enum {
        FS__DEBUGFS = 2,
        FS__TRACEFS = 3,
        FS__HUGETLBFS = 4,
+       FS__BPF_FS = 5,
 };
 
 #ifndef TRACEFS_MAGIC
@@ -121,6 +131,11 @@ static struct fs fs__entries[] = {
                .mounts = hugetlbfs__known_mountpoints,
                .magic  = HUGETLBFS_MAGIC,
        },
+       [FS__BPF_FS] = {
+               .name   = "bpf",
+               .mounts = bpf_fs__known_mountpoints,
+               .magic  = BPF_FS_MAGIC,
+       },
 };
 
 static bool fs__read_mounts(struct fs *fs)
@@ -280,6 +295,7 @@ FS(procfs,  FS__PROCFS);
 FS(debugfs, FS__DEBUGFS);
 FS(tracefs, FS__TRACEFS);
 FS(hugetlbfs, FS__HUGETLBFS);
+FS(bpf_fs, FS__BPF_FS);
 
 int filename__read_int(const char *filename, int *value)
 {
diff --git a/tools/lib/api/fs/fs.h b/tools/lib/api/fs/fs.h
index a63269f5d20c..6b332dc74498 100644
--- a/tools/lib/api/fs/fs.h
+++ b/tools/lib/api/fs/fs.h
@@ -22,6 +22,7 @@ FS(procfs)
 FS(debugfs)
 FS(tracefs)
 FS(hugetlbfs)
+FS(bpf_fs)
 
 #undef FS
 
-- 
2.11.0