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Mon, 04 Mar 2024 20:02:45 +0100 Received: from localhost ([::1] helo=dude05.red.stw.pengutronix.de) by dude05.red.stw.pengutronix.de with esmtp (Exim 4.96) (envelope-from ) id 1rhDYK-00Ed9V-2d; Mon, 04 Mar 2024 20:00:45 +0100 From: Ahmad Fatoum To: barebox@lists.infradead.org Cc: Ahmad Fatoum Date: Mon, 4 Mar 2024 19:59:24 +0100 Message-Id: <20240304190038.3486881-40-a.fatoum@pengutronix.de> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20240304190038.3486881-1-a.fatoum@pengutronix.de> References: <20240304190038.3486881-1-a.fatoum@pengutronix.de> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240304_190247_059485_99DD75AF X-CRM114-Status: GOOD ( 21.42 ) X-BeenThere: barebox@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "barebox" X-SA-Exim-Connect-IP: 2607:7c80:54:3::133 X-SA-Exim-Mail-From: barebox-bounces+lore=pengutronix.de@lists.infradead.org X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on metis.whiteo.stw.pengutronix.de X-Spam-Level: X-Spam-Status: No, score=-5.4 required=4.0 tests=AWL,BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,RCVD_IN_DNSWL_MED,SPF_HELO_NONE,SPF_NONE, T_SCC_BODY_TEXT_LINE autolearn=unavailable autolearn_force=no version=3.4.2 Subject: [PATCH v2 039/113] commands: introduce new findmnt command X-SA-Exim-Version: 4.2.1 (built Wed, 08 May 2019 21:11:16 +0000) X-SA-Exim-Scanned: Yes (on metis.whiteo.stw.pengutronix.de) EFI loader support will need to map barebox VFS paths to fs_device and back. Make development easier by providing a findmnt command to test the mapping. Signed-off-by: Ahmad Fatoum --- commands/Kconfig | 15 +++++++ commands/Makefile | 1 + commands/findmnt.c | 108 +++++++++++++++++++++++++++++++++++++++++++++ fs/fs.c | 4 +- include/driver.h | 5 +++ include/fs.h | 2 + 6 files changed, 132 insertions(+), 3 deletions(-) create mode 100644 commands/findmnt.c diff --git a/commands/Kconfig b/commands/Kconfig index 04bfc85a951d..9df3c67d930d 100644 --- a/commands/Kconfig +++ b/commands/Kconfig @@ -655,6 +655,21 @@ config CMD_MOUNT -o OPTIONS set file system OPTIONS -v verbose +config CMD_FINDMNT + tristate + prompt "findmnt" + help + Find a file system + + Usage: findmnt [ DEVICE | -T FILE ] + + findmnt will list all mounted filesystems or search + for a filesystem when given the mountpoint or the + source device as an argument + + Options: + -T mount target file path + config CMD_PARTED tristate depends on PARTITION diff --git a/commands/Makefile b/commands/Makefile index 8fdff75a72a6..19c006101dc6 100644 --- a/commands/Makefile +++ b/commands/Makefile @@ -36,6 +36,7 @@ obj-$(CONFIG_CMD_RM) += rm.o obj-$(CONFIG_CMD_CAT) += cat.o obj-$(CONFIG_CMD_MOUNT) += mount.o obj-$(CONFIG_CMD_UMOUNT) += umount.o +obj-$(CONFIG_CMD_FINDMNT) += findmnt.o obj-$(CONFIG_CMD_REGINFO) += reginfo.o obj-$(CONFIG_CMD_CRC) += crc.o obj-$(CONFIG_CMD_CLEAR) += clear.o diff --git a/commands/findmnt.c b/commands/findmnt.c new file mode 100644 index 000000000000..da8f58835f28 --- /dev/null +++ b/commands/findmnt.c @@ -0,0 +1,108 @@ +// SPDX-License-Identifier: GPL-2.0-only +// SPDX-FileCopyrightText: © 2022 Ahmad Fatoum, Pengutronix + +#include +#include +#include +#include +#include + +static void print_header(bool *header_printed) +{ + if (*header_printed) + return; + printf("%-20s%-25s%-10s%-20s\n", "TARGET", "SOURCE", "FSTYPE", "OPTIONS"); + *header_printed = true; +} + +static void report_findmnt(const struct fs_device *fsdev) +{ + const char *backingstore; + + backingstore = fsdev->backingstore ?: cdev_name(fsdev->cdev) ?: "none"; + + printf("%-20s%-25s%-10s%-20s\n", fsdev->path, backingstore, + fsdev->driver->drv.name, fsdev->options); +} + +static int do_findmnt(int argc, char *argv[]) +{ + bool header_printed = false; + struct fs_device *target = NULL; + char *device = NULL; + int opt, dirfd = AT_FDCWD; + + while ((opt = getopt(argc, argv, "T:")) > 0) { + switch(opt) { + case 'T': + target = get_fsdevice_by_path(dirfd, optarg); + if (!target) + return COMMAND_ERROR; + break; + default: + return COMMAND_ERROR_USAGE; + } + } + + argv += optind; + argc -= optind; + + if ((target && argc > 0) || (!target && argc > 1)) + return COMMAND_ERROR_USAGE; + + if (target) { + print_header(&header_printed); + report_findmnt(target); + return 0; + } + + if (argv[0]) { + device = canonicalize_path(dirfd, argv[0]); + if (!device) + return COMMAND_ERROR; + } + + for_each_fs_device(target) { + if (!device || streq_ptr(target->path, device) || + streq_ptr(target->backingstore, device)) { + print_header(&header_printed); + report_findmnt(target); + } else { + const char *backingstore; + struct cdev *cdev; + + cdev = cdev_by_name(devpath_to_name(device)); + if (!cdev) + continue; + + backingstore = target->backingstore; + backingstore += str_has_prefix(backingstore, "/dev/"); + + if (streq_ptr(backingstore, cdev->name)) { + print_header(&header_printed); + report_findmnt(target); + } + } + } + + free(device); + + return header_printed ? 0 : COMMAND_ERROR; +} + +BAREBOX_CMD_HELP_START(findmnt) +BAREBOX_CMD_HELP_TEXT("findmnt will list all mounted filesystems or search") +BAREBOX_CMD_HELP_TEXT("for a filesystem when given the mountpoint or the") +BAREBOX_CMD_HELP_TEXT("source device as an argument") +BAREBOX_CMD_HELP_TEXT("") +BAREBOX_CMD_HELP_TEXT("Options:") +BAREBOX_CMD_HELP_OPT ("-T", "mount target file path") +BAREBOX_CMD_HELP_END + +BAREBOX_CMD_START(findmnt) + .cmd = do_findmnt, + BAREBOX_CMD_DESC("find a file system") + BAREBOX_CMD_OPTS("[ DEVICE | -T FILE ]") + BAREBOX_CMD_GROUP(CMD_GRP_FILE) + BAREBOX_CMD_HELP(cmd_findmnt_help) +BAREBOX_CMD_END diff --git a/fs/fs.c b/fs/fs.c index 9b876fe1f9be..0ff7f1b6f947 100644 --- a/fs/fs.c +++ b/fs/fs.c @@ -130,8 +130,6 @@ void cdev_print(const struct cdev *cdev) } EXPORT_SYMBOL(cdev_print); -static struct fs_device *get_fsdevice_by_path(int dirfd, const char *path); - void stat_print(const char *filename, const struct stat *st) { int dirfd = AT_FDCWD; @@ -2383,7 +2381,7 @@ static int filename_lookup(int dirfd, struct filename *name, unsigned flags, return err; } -static struct fs_device *get_fsdevice_by_path(int dirfd, const char *pathname) +struct fs_device *get_fsdevice_by_path(int dirfd, const char *pathname) { struct fs_device *fsdev; struct path path; diff --git a/include/driver.h b/include/driver.h index 54b30d9921e0..7ff65d63946d 100644 --- a/include/driver.h +++ b/include/driver.h @@ -590,6 +590,11 @@ static inline void cdev_set_of_node(struct cdev *cdev, struct device_node *np) cdev->device_node = np; } +static inline const char *cdev_name(struct cdev *cdev) +{ + return cdev ? cdev->name : NULL; +} + int devfs_create(struct cdev *); int devfs_create_link(struct cdev *, const char *name); int devfs_remove(struct cdev *); diff --git a/include/fs.h b/include/fs.h index c4af8659b0d3..020761692cad 100644 --- a/include/fs.h +++ b/include/fs.h @@ -152,6 +152,8 @@ void cdev_print(const struct cdev *cdev); char *canonicalize_path(int dirfd, const char *pathname); +struct fs_device *get_fsdevice_by_path(int dirfd, const char *path); + char *get_mounted_path(const char *path); struct cdev *get_cdev_by_mountpath(const char *path); -- 2.39.2