From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from 4.mo2.mail-out.ovh.net ([87.98.172.75] helo=mo2.mail-out.ovh.net) by merlin.infradead.org with esmtp (Exim 4.76 #1 (Red Hat Linux)) id 1T8TZZ-0001pP-Lv for barebox@lists.infradead.org; Mon, 03 Sep 2012 10:08:03 +0000 Received: from mail21.ha.ovh.net (b6.ovh.net [213.186.33.56]) by mo2.mail-out.ovh.net (Postfix) with SMTP id 47B41DC09AF for ; Mon, 3 Sep 2012 12:13:18 +0200 (CEST) From: Jean-Christophe PLAGNIOL-VILLARD Date: Mon, 3 Sep 2012 12:08:01 +0200 Message-Id: <1346666898-19347-1-git-send-email-plagnioj@jcrosoft.com> In-Reply-To: <20120903100409.GC24296@game.jcrosoft.org> References: <20120903100409.GC24296@game.jcrosoft.org> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: barebox-bounces@lists.infradead.org Errors-To: barebox-bounces+u.kleine-koenig=pengutronix.de@lists.infradead.org Subject: [PATCH 01/18] fs: add readlink support To: barebox@lists.infradead.org Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD --- fs/fs.c | 58 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ include/fs.h | 5 +++++ 2 files changed, 63 insertions(+) diff --git a/fs/fs.c b/fs/fs.c index 8ab1a3a..dc9deae 100644 --- a/fs/fs.c +++ b/fs/fs.c @@ -890,6 +890,64 @@ int close(int fd) } EXPORT_SYMBOL(close); +int readlink(const char *pathname, char *buf, size_t bufsiz) +{ + struct fs_driver_d *fsdrv; + struct fs_device_d *fsdev; + char *p = normalise_path(pathname); + char *freep = p; + int ret; + size_t len = 0; + char tmp[PATH_MAX]; + + memset(tmp, 0, PATH_MAX); + + buf[0] = 0; + + ret = path_check_prereq(pathname, S_IFLNK); + if (ret) + goto out; + + fsdev = get_fs_device_and_root_path(&p); + if (!fsdev) { + ret = -ENODEV; + goto out; + } + fsdrv = fsdev->driver; + + len = min(bufsiz, (size_t)(PATH_MAX - 1)); + if (fsdrv->readlink) + ret = fsdrv->readlink(&fsdev->dev, p, tmp, len); + else + ret = -ENOSYS; + + if (ret) + goto out; + + if (tmp[0] == '/') { + int l = strlen(fsdev->path); + + if (fsdev->path[l - 1] == '/') + l--; + + if (l) { + len -= l; + strncat(buf, fsdev->path, l); + } + } + + strncat(buf, tmp, len); + +out: + free(freep); + + if (ret) + errno = -ret; + + return ret; +} +EXPORT_SYMBOL(readlink); + static int fs_match(struct device_d *dev, struct driver_d *drv) { return strcmp(dev->name, drv->name) ? -1 : 0; diff --git a/include/fs.h b/include/fs.h index 22470e6..96fe9be 100644 --- a/include/fs.h +++ b/include/fs.h @@ -51,6 +51,9 @@ struct fs_driver_d { /* Truncate a file to given size */ int (*truncate)(struct device_d *dev, FILE *f, ulong size); + int (*readlink)(struct device_d *dev, const char *pathname, char *name, + size_t size); + int (*open)(struct device_d *dev, FILE *f, const char *pathname); int (*close)(struct device_d *dev, FILE *f); int (*read)(struct device_d *dev, FILE *f, void *buf, size_t size); @@ -129,6 +132,8 @@ DIR *opendir(const char *pathname); struct dirent *readdir(DIR *dir); int closedir(DIR *dir); +int readlink(const char *path, char *buf, size_t bufsiz); + int mount (const char *device, const char *fsname, const char *path); int umount(const char *pathname); -- 1.7.10.4 _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox