From patchwork Thu Feb 15 19:04:47 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Omar Sandoval X-Patchwork-Id: 10223393 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 23EA1602CB for ; Thu, 15 Feb 2018 19:05:53 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 0778E29483 for ; Thu, 15 Feb 2018 19:05:53 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id F02D82948F; Thu, 15 Feb 2018 19:05:52 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.8 required=2.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_HI,T_DKIM_INVALID autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 9A3A529483 for ; Thu, 15 Feb 2018 19:05:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1167174AbeBOTFs (ORCPT ); Thu, 15 Feb 2018 14:05:48 -0500 Received: from mail-pg0-f43.google.com ([74.125.83.43]:46948 "EHLO mail-pg0-f43.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1161369AbeBOTFb (ORCPT ); Thu, 15 Feb 2018 14:05:31 -0500 Received: by mail-pg0-f43.google.com with SMTP id a11so484994pgu.13 for ; Thu, 15 Feb 2018 11:05:30 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=osandov-com.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:in-reply-to:references :in-reply-to:references; bh=kUEHXKhDCNAuMVY5OB+BV9ywprxrXQyXexwRdkPicbc=; b=pHZ0JhIf4aRrAQdlEd6oYIGLed5sp5W9lwlBBDZSBoioM03MF1ibYkuiHcmdboXNZL dcd/zwFDSW12LBAEycEhYle8CwnfQxU328Jn7V6d9xDsiTQXVDbVkkHr1klL3W2KavvE nQz6OFzHC/dQWZIdqp9sRWbohC9XABaK49Di626ETClPtsYH8J1tA2G6KsdOt3pBkfKC u2EeDorXMocXRTSO35eqy0jQR8HoKpuv7ZI/upPIV+4inwWT3PBU94IzaDpKE4e2tYD+ eZU+/B0aGL0drSTX26lqTt4uWOMtLE7oRL+aqWYVC9aZ7r9tagJueI18KYpWYB4T/FFk +++Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:in-reply-to:references; bh=kUEHXKhDCNAuMVY5OB+BV9ywprxrXQyXexwRdkPicbc=; b=DaM9DhTS8rAc2Lw0laYpm3QHlWXD0AtVS7CtqnVeAhSVmNoINEKjoNdeZgF/c/CjoZ cBCY7G1oBDIivIGOMbAxZTy09xE7In+VnzwufceU0s9/NLOIPfochOpJgohKhZAFhBe1 9OggMyzl2wuv9SsBY9m3kRzqr3+sAGHvKJ0etZk2aQclne+9v1NAgP8k5QuDzFcgcz6g oQgQxzxb5SvwFhjTywpDhW3qWlhT3/SaD7gGa40Gx1MVSd2/7a7DejaGoHKW/693yVph 2rTjg9c9BQCnx/fcYXakN0oUnuWAFfnVbj/d+lq2Qw5tuy6FEg7jB/3q4G0Rxj2lUVpz 3bVg== X-Gm-Message-State: APf1xPCfVm9QkUX5NodCZe9naEVFRMn+bFxf8qERpQm5hkAcqeODQIuJ RK7aKRxMlqlvCmPPxSAUb4hEw4/tZA8= X-Google-Smtp-Source: AH8x2279aG9YR0TvNnRvlcde/jXgDLUehBVGZ032cbrP5b6kRCcf09MdS8xxe2ZpZOztN4iUDMwdig== X-Received: by 10.101.101.83 with SMTP id a19mr3030896pgw.192.1518721528334; Thu, 15 Feb 2018 11:05:28 -0800 (PST) Received: from vader.thefacebook.com ([2620:10d:c090:200::6:4a19]) by smtp.gmail.com with ESMTPSA id p1sm40467428pgr.44.2018.02.15.11.05.27 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 15 Feb 2018 11:05:27 -0800 (PST) From: Omar Sandoval To: linux-btrfs@vger.kernel.org Cc: kernel-team@fb.com Subject: [PATCH v2 02/27] Add libbtrfsutil Date: Thu, 15 Feb 2018 11:04:47 -0800 Message-Id: <5882a6f0414a436bd7a4cfaae938e451724684ac.1518720598.git.osandov@fb.com> X-Mailer: git-send-email 2.16.1 In-Reply-To: References: In-Reply-To: References: Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Omar Sandoval Currently, users wishing to manage Btrfs filesystems programatically have to shell out to btrfs-progs and parse the output. This isn't ideal. The goal of libbtrfsutil is to provide a library version of as many of the operations of btrfs-progs as possible and to migrate btrfs-progs to use it. Rather than simply refactoring the existing btrfs-progs code, the code has to be written from scratch for a couple of reasons: * A lot of the btrfs-progs code was not designed with a nice library API in mind in terms of reusability, naming, and error reporting. * libbtrfsutil is licensed under the LGPL, whereas btrfs-progs is under the GPL, which makes it dubious to directly copy or move the code. Eventually, most of the low-level btrfs-progs code should either live in libbtrfsutil or the shared kernel/userspace filesystem code, and btrfs-progs will just be the CLI wrapper. This first commit just includes the build system changes, license, README, and error reporting helper. Signed-off-by: Omar Sandoval Reviewed-by: Liu Bo --- .gitignore | 2 + Makefile | 72 ++-- Makefile.inc.in | 2 +- libbtrfsutil/COPYING | 674 ++++++++++++++++++++++++++++++++++++++ libbtrfsutil/COPYING.LESSER | 165 ++++++++++ libbtrfsutil/README.md | 35 ++ libbtrfsutil/btrfsutil.h | 76 +++++ libbtrfsutil/btrfsutil_internal.h | 40 +++ libbtrfsutil/errors.c | 55 ++++ 9 files changed, 1100 insertions(+), 21 deletions(-) create mode 100644 libbtrfsutil/COPYING create mode 100644 libbtrfsutil/COPYING.LESSER create mode 100644 libbtrfsutil/README.md create mode 100644 libbtrfsutil/btrfsutil.h create mode 100644 libbtrfsutil/btrfsutil_internal.h create mode 100644 libbtrfsutil/errors.c diff --git a/.gitignore b/.gitignore index 8e607f6e..272d53e4 100644 --- a/.gitignore +++ b/.gitignore @@ -43,6 +43,8 @@ libbtrfs.so.0.1 library-test library-test-static /fssum +/libbtrfsutil.so* +/libbtrfsutil.a /tests/*-tests-results.txt /tests/test-console.txt diff --git a/Makefile b/Makefile index 00e21379..7fb70d06 100644 --- a/Makefile +++ b/Makefile @@ -73,10 +73,20 @@ CFLAGS = $(SUBST_CFLAGS) \ -fPIC \ -I$(TOPDIR) \ -I$(TOPDIR)/kernel-lib \ + -I$(TOPDIR)/libbtrfsutil \ $(EXTRAWARN_CFLAGS) \ $(DEBUG_CFLAGS_INTERNAL) \ $(EXTRA_CFLAGS) +LIBBTRFSUTIL_CFLAGS = $(SUBST_CFLAGS) \ + $(CSTD) \ + -D_GNU_SOURCE \ + -fPIC \ + -fvisibility=hidden \ + -I$(TOPDIR)/libbtrfsutil \ + $(EXTRAWARN_CFLAGS) \ + $(EXTRA_CFLAGS) + LDFLAGS = $(SUBST_LDFLAGS) \ -rdynamic -L$(TOPDIR) \ $(DEBUG_LDFLAGS_INTERNAL) \ @@ -121,12 +131,17 @@ libbtrfs_headers = send-stream.h send-utils.h send.h kernel-lib/rbtree.h btrfs-l kernel-lib/crc32c.h kernel-lib/list.h kerncompat.h \ kernel-lib/radix-tree.h kernel-lib/sizes.h kernel-lib/raid56.h \ extent-cache.h extent_io.h ioctl.h ctree.h btrfsck.h version.h +libbtrfsutil_major := $(shell sed -rn 's/^\#define BTRFS_UTIL_VERSION_MAJOR ([0-9])+$$/\1/p' libbtrfsutil/btrfsutil.h) +libbtrfsutil_minor := $(shell sed -rn 's/^\#define BTRFS_UTIL_VERSION_MINOR ([0-9])+$$/\1/p' libbtrfsutil/btrfsutil.h) +libbtrfsutil_patch := $(shell sed -rn 's/^\#define BTRFS_UTIL_VERSION_PATCH ([0-9])+$$/\1/p' libbtrfsutil/btrfsutil.h) +libbtrfsutil_version := $(libbtrfsutil_major).$(libbtrfsutil_minor).$(libbtrfsutil_patch) +libbtrfsutil_objects = libbtrfsutil/errors.o convert_objects = convert/main.o convert/common.o convert/source-fs.o \ convert/source-ext2.o convert/source-reiserfs.o mkfs_objects = mkfs/main.o mkfs/common.o mkfs/rootdir.o image_objects = image/main.o image/sanitize.o all_objects = $(objects) $(cmds_objects) $(libbtrfs_objects) $(convert_objects) \ - $(mkfs_objects) $(image_objects) + $(mkfs_objects) $(image_objects) $(libbtrfsutil_objects) udev_rules = 64-btrfs-dm.rules @@ -246,11 +261,10 @@ static_convert_objects = $(patsubst %.o, %.static.o, $(convert_objects)) static_mkfs_objects = $(patsubst %.o, %.static.o, $(mkfs_objects)) static_image_objects = $(patsubst %.o, %.static.o, $(image_objects)) -libs_shared = libbtrfs.so.0.1 -libs_static = libbtrfs.a +libs_shared = libbtrfs.so.0.1 libbtrfsutil.so.$(libbtrfsutil_version) +libs_static = libbtrfs.a libbtrfsutil.a libs = $(libs_shared) $(libs_static) -lib_links = libbtrfs.so.0 libbtrfs.so -headers = $(libbtrfs_headers) +lib_links = libbtrfs.so.0 libbtrfs.so libbtrfsutil.so.$(libbtrfsutil_major) libbtrfsutil.so # make C=1 to enable sparse ifdef C @@ -287,7 +301,7 @@ endif $(Q)$(CC) $(STATIC_CFLAGS) -c $< -o $@ $($(subst -,_,$(@:%.static.o=%)-cflags)) \ $($(subst -,_,btrfs-$(@:%/$(notdir $@)=%)-cflags)) -all: $(progs) libbtrfs $(BUILDDIRS) +all: $(progs) $(libs) $(lib_links) $(BUILDDIRS) $(SUBDIRS): $(BUILDDIRS) $(BUILDDIRS): @echo "Making all in $(patsubst build-%,%,$@)" @@ -351,20 +365,35 @@ kernel-lib/tables.c: @echo " [TABLE] $@" $(Q)./mktables > $@ || ($(RM) -f $@ && exit 1) -libbtrfs: $(libs_shared) $(lib_links) +libbtrfs.so.0.1: $(libbtrfs_objects) + @echo " [LD] $@" + $(Q)$(CC) $(CFLAGS) $^ $(LDFLAGS) $(LIBBTRFS_LIBS) \ + -shared -Wl,-soname,libbtrfs.so.0 -o $@ + +libbtrfs.a: $(libbtrfs_objects) + @echo " [AR] $@" + $(Q)$(AR) cr $@ $^ + +libbtrfs.so.0 libbtrfs.so: libbtrfs.so.0.1 + @echo " [LN] $@" + $(Q)$(LN_S) -f $< $@ + +libbtrfsutil/%.o: libbtrfsutil/%.c + @echo " [CC] $@" + $(Q)$(CC) $(LIBBTRFSUTIL_CFLAGS) -o $@ -c $< -o $@ -$(libs_shared): $(libbtrfs_objects) $(lib_links) send.h +libbtrfsutil.so.$(libbtrfsutil_version): $(libbtrfsutil_objects) @echo " [LD] $@" - $(Q)$(CC) $(CFLAGS) $(libbtrfs_objects) $(LDFLAGS) $(LIBBTRFS_LIBS) \ - -shared -Wl,-soname,libbtrfs.so.0 -o libbtrfs.so.0.1 + $(Q)$(CC) $(LIBBTRFSUTIL_CFLAGS) $(libbtrfsutil_objects) \ + -shared -Wl,-soname,libbtrfsutil.so.$(libbtrfsutil_major) -o $@ -$(libs_static): $(libbtrfs_objects) +libbtrfsutil.a: $(libbtrfsutil_objects) @echo " [AR] $@" - $(Q)$(AR) cr libbtrfs.a $(libbtrfs_objects) + $(Q)$(AR) cr $@ $^ -$(lib_links): +libbtrfsutil.so.$(libbtrfsutil_major) libbtrfsutil.so: libbtrfsutil.so.$(libbtrfsutil_version) @echo " [LN] $@" - $(Q)$(LN_S) -f libbtrfs.so.0.1 $@ + $(Q)$(LN_S) -f $< $@ # keep intermediate files from the below implicit rules around .PRECIOUS: $(addsuffix .o,$(progs)) @@ -483,7 +512,7 @@ test-ioctl: ioctl-test ioctl-test-32 ioctl-test-64 $(Q)./ioctl-test-32 > ioctl-test-32.log $(Q)./ioctl-test-64 > ioctl-test-64.log -library-test: library-test.c $(libs_shared) +library-test: library-test.c libbtrfs.so @echo " [TEST PREP] $@"$(eval TMPD=$(shell mktemp -d)) $(Q)mkdir -p $(TMPD)/include/btrfs && \ cp $(libbtrfs_headers) $(TMPD)/include/btrfs && \ @@ -547,7 +576,8 @@ clean: $(CLEANDIRS) mktables btrfs.static mkfs.btrfs.static fssum \ $(check_defs) \ $(libs) $(lib_links) \ - $(progs_static) $(progs_extra) + $(progs_static) $(progs_extra) \ + libbtrfsutil/*.o libbtrfsutil/*.o.d clean-doc: @echo "Cleaning Documentation" @@ -575,8 +605,9 @@ install: $(libs) $(progs_install) $(INSTALLDIRS) $(INSTALL) -m755 -d $(DESTDIR)$(libdir) $(INSTALL) $(libs) $(DESTDIR)$(libdir) cp -a $(lib_links) $(DESTDIR)$(libdir) - $(INSTALL) -m755 -d $(DESTDIR)$(incdir) - $(INSTALL) -m644 $(headers) $(DESTDIR)$(incdir) + $(INSTALL) -m755 -d $(DESTDIR)$(incdir)/btrfs + $(INSTALL) -m644 $(libbtrfs_headers) $(DESTDIR)$(incdir)/btrfs + $(INSTALL) -m644 libbtrfsutil/btrfsutil.h $(DESTDIR)$(incdir) ifneq ($(udevdir),) $(INSTALL) -m755 -d $(DESTDIR)$(udevruledir) $(INSTALL) -m644 $(udev_rules) $(DESTDIR)$(udevruledir) @@ -594,8 +625,9 @@ $(INSTALLDIRS): uninstall: $(Q)$(MAKE) $(MAKEOPTS) -C Documentation uninstall - cd $(DESTDIR)$(incdir); $(RM) -f -- $(headers) - $(RMDIR) -p --ignore-fail-on-non-empty -- $(DESTDIR)$(incdir) + cd $(DESTDIR)$(incdir)/btrfs; $(RM) -f -- $(libbtrfs_headers) + $(RMDIR) -p --ignore-fail-on-non-empty -- $(DESTDIR)$(incdir)/btrfs + cd $(DESTDIR)$(incdir); $(RM) -f -- btrfsutil.h cd $(DESTDIR)$(libdir); $(RM) -f -- $(lib_links) $(libs) cd $(DESTDIR)$(bindir); $(RM) -f -- btrfsck fsck.btrfs $(progs_install) diff --git a/Makefile.inc.in b/Makefile.inc.in index 56271903..b53bef80 100644 --- a/Makefile.inc.in +++ b/Makefile.inc.in @@ -27,7 +27,7 @@ prefix ?= @prefix@ exec_prefix = @exec_prefix@ bindir = @bindir@ libdir ?= @libdir@ -incdir = @includedir@/btrfs +incdir = @includedir@ udevdir = @UDEVDIR@ udevruledir = ${udevdir}/rules.d diff --git a/libbtrfsutil/COPYING b/libbtrfsutil/COPYING new file mode 100644 index 00000000..f288702d --- /dev/null +++ b/libbtrfsutil/COPYING @@ -0,0 +1,674 @@ + GNU GENERAL PUBLIC LICENSE + Version 3, 29 June 2007 + + Copyright (C) 2007 Free Software Foundation, Inc. + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The GNU General Public License is a free, copyleft license for +software and other kinds of works. + + The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. 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It is licensed under +the LGPL. libbtrfsutil provides interfaces for a subset of the operations +offered by the `btrfs` command line utility. + +Development +----------- + +The [development process for btrfs-progs](../README.md#development) applies. + +libbtrfsutil only includes operations that are done through the filesystem and +ioctl interface, not operations that modify the filesystem directly (e.g., mkfs +or fsck). This is by design but also a legal necessity, as the filesystem +implementation is GPL but libbtrfsutil is LGPL. That is also why the +libbtrfsutil code is a reimplementation of the btrfs-progs code rather than a +refactoring. Be wary of this when porting functionality. + +libbtrfsutil is semantically versioned separately from btrfs-progs. It is the +maintainers' responsibility to bump the version as needed (at most once per +release of btrfs-progs). + +A few guidelines: + +* All interfaces must be documented in `btrfsutil.h` using the kernel-doc style +* Error codes should be specific about what _exactly_ failed +* Functions should have a path and an fd variant whenever possible +* Spell out terms in function names, etc. rather than abbreviating whenever + possible +* Don't require the Btrfs UAPI headers for any interfaces (e.g., instead of + directly exposing a type from `linux/btrfs_tree.h`, abstract it away in a + type specific to `libbtrfsutil`) +* Preserve API and ABI compatability at all times (i.e., we don't want to bump + the library major version if we don't have to) diff --git a/libbtrfsutil/btrfsutil.h b/libbtrfsutil/btrfsutil.h new file mode 100644 index 00000000..867418f2 --- /dev/null +++ b/libbtrfsutil/btrfsutil.h @@ -0,0 +1,76 @@ +/* + * Copyright (C) 2018 Facebook + * + * This file is part of libbtrfsutil. + * + * libbtrfsutil is free software: you can redistribute it and/or modify + * it under the terms of the GNU Lesser General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * libbtrfsutil is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public License + * along with libbtrfsutil. If not, see . + */ + +#ifndef BTRFS_UTIL_H +#define BTRFS_UTIL_H + +#define BTRFS_UTIL_VERSION_MAJOR 1 +#define BTRFS_UTIL_VERSION_MINOR 0 +#define BTRFS_UTIL_VERSION_PATCH 0 + +#ifdef __cplusplus +extern "C" { +#endif + +/** + * enum btrfs_util_error - libbtrfsutil error codes. + * + * All functions in libbtrfsutil that can return an error return this type and + * set errno. + */ +enum btrfs_util_error { + BTRFS_UTIL_OK, + BTRFS_UTIL_ERROR_STOP_ITERATION, + BTRFS_UTIL_ERROR_NO_MEMORY, + BTRFS_UTIL_ERROR_INVALID_ARGUMENT, + BTRFS_UTIL_ERROR_NOT_BTRFS, + BTRFS_UTIL_ERROR_NOT_SUBVOLUME, + BTRFS_UTIL_ERROR_SUBVOLUME_NOT_FOUND, + BTRFS_UTIL_ERROR_OPEN_FAILED, + BTRFS_UTIL_ERROR_RMDIR_FAILED, + BTRFS_UTIL_ERROR_UNLINK_FAILED, + BTRFS_UTIL_ERROR_STAT_FAILED, + BTRFS_UTIL_ERROR_STATFS_FAILED, + BTRFS_UTIL_ERROR_SEARCH_FAILED, + BTRFS_UTIL_ERROR_INO_LOOKUP_FAILED, + BTRFS_UTIL_ERROR_SUBVOL_GETFLAGS_FAILED, + BTRFS_UTIL_ERROR_SUBVOL_SETFLAGS_FAILED, + BTRFS_UTIL_ERROR_SUBVOL_CREATE_FAILED, + BTRFS_UTIL_ERROR_SNAP_CREATE_FAILED, + BTRFS_UTIL_ERROR_SNAP_DESTROY_FAILED, + BTRFS_UTIL_ERROR_DEFAULT_SUBVOL_FAILED, + BTRFS_UTIL_ERROR_SYNC_FAILED, + BTRFS_UTIL_ERROR_START_SYNC_FAILED, + BTRFS_UTIL_ERROR_WAIT_SYNC_FAILED, +}; + +/** + * btrfs_util_strerror() - Convert a libtrfsutil error code to a string + * description. + * @err: The error to convert. + * + * Return: Error description. + */ +const char *btrfs_util_strerror(enum btrfs_util_error err); + +#ifdef __cplusplus +} +#endif + +#endif /* BTRFS_UTIL_H */ diff --git a/libbtrfsutil/btrfsutil_internal.h b/libbtrfsutil/btrfsutil_internal.h new file mode 100644 index 00000000..bdf8840a --- /dev/null +++ b/libbtrfsutil/btrfsutil_internal.h @@ -0,0 +1,40 @@ +/* + * Copyright (C) 2018 Facebook + * + * This file is part of libbtrfsutil. + * + * libbtrfsutil is free software: you can redistribute it and/or modify + * it under the terms of the GNU Lesser General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * libbtrfsutil is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public License + * along with libbtrfsutil. If not, see . + */ + +#ifndef BTRFS_UTIL_INTERNAL_H +#define BTRFS_UTIL_INTERNAL_H + +#include + +#include "btrfsutil.h" + +#define PUBLIC __attribute__((visibility("default"))) + +#define le16_to_cpu __le16_to_cpu +#define le32_to_cpu __le32_to_cpu +#define le64_to_cpu __le64_to_cpu + +#define SAVE_ERRNO_AND_CLOSE(fd) { \ + int saved_errno = errno; \ + \ + close(fd); \ + errno = saved_errno; \ +} + +#endif /* BTRFS_UTIL_INTERNAL_H */ diff --git a/libbtrfsutil/errors.c b/libbtrfsutil/errors.c new file mode 100644 index 00000000..634edc65 --- /dev/null +++ b/libbtrfsutil/errors.c @@ -0,0 +1,55 @@ +/* + * Copyright (C) 2018 Facebook + * + * This file is part of libbtrfsutil. + * + * libbtrfsutil is free software: you can redistribute it and/or modify + * it under the terms of the GNU Lesser General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * libbtrfsutil is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public License + * along with libbtrfsutil. If not, see . + */ + +#include + +#include "btrfsutil_internal.h" + +static const char * const error_messages[] = { + [BTRFS_UTIL_OK] = "Success", + [BTRFS_UTIL_ERROR_STOP_ITERATION] = "Stop iteration", + [BTRFS_UTIL_ERROR_NO_MEMORY] = "Cannot allocate memory", + [BTRFS_UTIL_ERROR_INVALID_ARGUMENT] = "Invalid argument", + [BTRFS_UTIL_ERROR_NOT_BTRFS] = "Not a Btrfs filesystem", + [BTRFS_UTIL_ERROR_NOT_SUBVOLUME] = "Not a Btrfs subvolume", + [BTRFS_UTIL_ERROR_SUBVOLUME_NOT_FOUND] = "Subvolume not found", + [BTRFS_UTIL_ERROR_OPEN_FAILED] = "Could not open", + [BTRFS_UTIL_ERROR_RMDIR_FAILED] = "Could not rmdir", + [BTRFS_UTIL_ERROR_UNLINK_FAILED] = "Could not unlink", + [BTRFS_UTIL_ERROR_STAT_FAILED] = "Could not stat", + [BTRFS_UTIL_ERROR_STATFS_FAILED] = "Could not statfs", + [BTRFS_UTIL_ERROR_SEARCH_FAILED] = "Could not search B-tree", + [BTRFS_UTIL_ERROR_INO_LOOKUP_FAILED] = "Could not lookup inode", + [BTRFS_UTIL_ERROR_SUBVOL_GETFLAGS_FAILED] = "Could not get subvolume flags", + [BTRFS_UTIL_ERROR_SUBVOL_SETFLAGS_FAILED] = "Could not set subvolume flags", + [BTRFS_UTIL_ERROR_SUBVOL_CREATE_FAILED] = "Could not create subvolume", + [BTRFS_UTIL_ERROR_SNAP_CREATE_FAILED] = "Could not create snapshot", + [BTRFS_UTIL_ERROR_SNAP_DESTROY_FAILED] = "Could not destroy subvolume/snapshot", + [BTRFS_UTIL_ERROR_DEFAULT_SUBVOL_FAILED] = "Could not set default subvolume", + [BTRFS_UTIL_ERROR_SYNC_FAILED] = "Could not sync filesystem", + [BTRFS_UTIL_ERROR_START_SYNC_FAILED] = "Could not start filesystem sync", + [BTRFS_UTIL_ERROR_WAIT_SYNC_FAILED] = "Could not wait for filesystem sync", +}; + +PUBLIC const char *btrfs_util_strerror(enum btrfs_util_error err) +{ + if (err < 0 || err >= sizeof(error_messages) / sizeof(error_messages[0])) + return NULL; + return error_messages[err]; +}