build: require explicit include paths for libbcachefs/

This removes the implicit `-I libbcachefs` argument to $(CC), which in turn
requires a set of minor changes throughout the tools. There are two advantages
to this setup:

    1) It is (arguably) easier to read, since the location of bcachefs includes
    are easier to understand at a glance ("where does util.h live?")

    2) It removes the need for a hack to include glibc's copy of
    dirent.h explicitly via '/usr/include/dirent.h', because libbcachefs/
    *also* has a dirent.h file and the compiler cannot disambiguate them.
    This has some ramifications on systems where /usr/include may not
    exist, such as NixOS.

Signed-off-by: Austin Seipp <aseipp@pobox.com>

Makefile

@@ -4,7 +4,7 @@ INSTALL=install
 CFLAGS+=-std=gnu89 -O2 -g -MMD -Wall				\
 	-Wno-pointer-sign					\
 	-fno-strict-aliasing					\
-	-I. -Iinclude -Ilibbcachefs				\
+	-I. -Iinclude						\
 	-D_FILE_OFFSET_BITS=64					\
 	-D_GNU_SOURCE						\
 	-D_LGPL_SOURCE						\

cmd_assemble.c

@@ -7,7 +7,7 @@
 #include <string.h>
 #include <sys/ioctl.h>
 
-#include "bcachefs_ioctl.h"
+#include "libbcachefs/bcachefs_ioctl.h"
 #include "cmds.h"
 
 int cmd_assemble(int argc, char *argv[])

cmd_debug.c

@@ -8,14 +8,14 @@
 #include "qcow2.h"
 #include "tools-util.h"
 
-#include "bcachefs.h"
+#include "libbcachefs/bcachefs.h"
-#include "alloc.h"
+#include "libbcachefs/alloc.h"
-#include "btree_cache.h"
+#include "libbcachefs/btree_cache.h"
-#include "btree_iter.h"
+#include "libbcachefs/btree_iter.h"
-#include "buckets.h"
+#include "libbcachefs/buckets.h"
-#include "error.h"
+#include "libbcachefs/error.h"
-#include "journal.h"
+#include "libbcachefs/journal.h"
-#include "super.h"
+#include "libbcachefs/super.h"
 
 static void dump_usage(void)
 {

cmd_device.c

@@ -12,10 +12,10 @@
 #include <sys/types.h>
 #include <unistd.h>
 
-#include "bcachefs_ioctl.h"
+#include "libbcachefs/bcachefs_ioctl.h"
 #include "cmds.h"
 #include "libbcachefs.h"
-#include "opts.h"
+#include "libbcachefs/opts.h"
 #include "tools-util.h"
 
 /* This code belongs under show_fs */

cmd_format.c

@@ -24,9 +24,9 @@
 #include "cmds.h"
 #include "libbcachefs.h"
 #include "crypto.h"
-#include "opts.h"
+#include "libbcachefs/opts.h"
-#include "super-io.h"
+#include "libbcachefs/super-io.h"
-#include "util.h"
+#include "libbcachefs/util.h"
 
 #define OPTS									\
 t("bcachefs format - create a new bcachefs filesystem on one or more devices")	\

cmd_fsck.c

@@ -1,8 +1,8 @@
 
 #include "cmds.h"
-#include "error.h"
+#include "libbcachefs/error.h"
 #include "libbcachefs.h"
-#include "super.h"
+#include "libbcachefs/super.h"
 #include "tools-util.h"
 
 static void usage(void)

cmd_key.c

@@ -3,7 +3,7 @@
 #include <uuid/uuid.h>
 
 #include "cmds.h"
-#include "checksum.h"
+#include "libbcachefs/checksum.h"
 #include "crypto.h"
 #include "libbcachefs.h"
 

cmd_migrate.c

@@ -1,4 +1,4 @@
-#include </usr/include/dirent.h>
+#include <dirent.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <getopt.h>
@@ -24,16 +24,16 @@
 #include <linux/dcache.h>
 #include <linux/generic-radix-tree.h>
 #include <linux/xattr.h>
-#include "bcachefs.h"
+#include "libbcachefs/bcachefs.h"
-#include "btree_update.h"
+#include "libbcachefs/btree_update.h"
-#include "buckets.h"
+#include "libbcachefs/buckets.h"
-#include "dirent.h"
+#include "libbcachefs/dirent.h"
-#include "fs.h"
+#include "libbcachefs/fs.h"
-#include "inode.h"
+#include "libbcachefs/inode.h"
-#include "io.h"
+#include "libbcachefs/io.h"
-#include "str_hash.h"
+#include "libbcachefs/str_hash.h"
-#include "super.h"
+#include "libbcachefs/super.h"
-#include "xattr.h"
+#include "libbcachefs/xattr.h"
 
 static char *dev_t_to_path(dev_t dev)
 {

cmd_run.c

@@ -11,7 +11,7 @@
 
 #include <uuid/uuid.h>
 
-#include "bcachefs_ioctl.h"
+#include "libbcachefs/bcachefs_ioctl.h"
 #include "cmds.h"
 
 int cmd_run(int argc, char *argv[])

crypto.c

@@ -15,7 +15,7 @@
 #include <libscrypt.h>
 #include <uuid/uuid.h>
 
-#include "checksum.h"
+#include "libbcachefs/checksum.h"
 #include "crypto.h"
 
 char *read_passphrase(const char *prompt)

libbcachefs.c

@@ -12,12 +12,12 @@
 
 #include <uuid/uuid.h>
 
-#include "bcachefs_format.h"
+#include "libbcachefs/bcachefs_format.h"
-#include "checksum.h"
+#include "libbcachefs/checksum.h"
 #include "crypto.h"
 #include "libbcachefs.h"
-#include "opts.h"
+#include "libbcachefs/opts.h"
-#include "super-io.h"
+#include "libbcachefs/super-io.h"
 
 #define NSEC_PER_SEC	1000000000L
 

libbcachefs.h

@@ -4,9 +4,9 @@
 #include <linux/uuid.h>
 #include <stdbool.h>
 
-#include "bcachefs_format.h"
+#include "libbcachefs/bcachefs_format.h"
 #include "tools-util.h"
-#include "vstructs.h"
+#include "libbcachefs/vstructs.h"
 
 struct format_opts {
 	char		*label;

tools-util.c

@@ -16,10 +16,10 @@
 #include <blkid.h>
 #include <uuid/uuid.h>
 
-#include "bcachefs_ioctl.h"
+#include "libbcachefs/bcachefs_ioctl.h"
 #include "linux/sort.h"
 #include "tools-util.h"
-#include "util.h"
+#include "libbcachefs/util.h"
 
 void die(const char *fmt, ...)
 {