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From: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
To: barebox@lists.infradead.org
Subject: [PATCH 01/18] fs: add readlink support
Date: Mon,  3 Sep 2012 12:08:01 +0200	[thread overview]
Message-ID: <1346666898-19347-1-git-send-email-plagnioj@jcrosoft.com> (raw)
In-Reply-To: <20120903100409.GC24296@game.jcrosoft.org>

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
---
 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


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  reply	other threads:[~2012-09-03 10:08 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-09-03 10:04 [PATCH 00/18 v3] fs: add symlink and " Jean-Christophe PLAGNIOL-VILLARD
2012-09-03 10:08 ` Jean-Christophe PLAGNIOL-VILLARD [this message]
2012-09-03 10:08   ` [PATCH 02/18] fs: rename stat to lstat as we implement lstat Jean-Christophe PLAGNIOL-VILLARD
2012-09-03 10:08   ` [PATCH 03/18] fs: add symlink support Jean-Christophe PLAGNIOL-VILLARD
2012-09-03 10:08   ` [PATCH 04/18] fs: implement stat Jean-Christophe PLAGNIOL-VILLARD
2012-09-03 10:08   ` [PATCH 05/18] fs: open: add symlink support Jean-Christophe PLAGNIOL-VILLARD
2012-09-03 10:08   ` [PATCH 06/18] fs: introduce get_mounted_path to get the path where a file is mounted Jean-Christophe PLAGNIOL-VILLARD
2012-09-03 10:08   ` [PATCH 07/18] ramfs: add symlink and readlink support Jean-Christophe PLAGNIOL-VILLARD
2012-09-03 10:08   ` [PATCH 08/18] nfs: add " Jean-Christophe PLAGNIOL-VILLARD
2012-09-03 10:08   ` [PATCH 09/18] test: add -L support to test if it's a symbolic link Jean-Christophe PLAGNIOL-VILLARD
2012-09-03 10:08   ` [PATCH 10/18] command: add readlink support Jean-Christophe PLAGNIOL-VILLARD
2012-09-03 10:08   ` [PATCH 11/18] command: add ln support Jean-Christophe PLAGNIOL-VILLARD
2012-09-03 10:08   ` [PATCH 12/18] ls: add symlink support to -l Jean-Christophe PLAGNIOL-VILLARD
2012-09-03 10:08   ` [PATCH 13/18] dirname: add -V option to return only path related to the mountpoint Jean-Christophe PLAGNIOL-VILLARD
2012-09-03 10:08   ` [PATCH 14/18] recursive_action: add ACTION_FOLLOWLINKS support Jean-Christophe PLAGNIOL-VILLARD
2012-09-03 10:08   ` [PATCH 15/18] envfs: introduce version major and minor Jean-Christophe PLAGNIOL-VILLARD
2012-09-03 10:08   ` [PATCH 16/18] envfs: add support of variable inode size Jean-Christophe PLAGNIOL-VILLARD
2012-09-03 10:08   ` [PATCH 17/18] envfs: add support of symlink Jean-Christophe PLAGNIOL-VILLARD
2012-09-03 10:08   ` [PATCH 18/18] defautenv: " Jean-Christophe PLAGNIOL-VILLARD
2012-09-03 13:04 ` [PATCH 00/18 v3] fs: add symlink and readlink support Sascha Hauer
2012-09-03 14:47   ` Jean-Christophe PLAGNIOL-VILLARD
  -- strict thread matches above, loose matches on Subject: below --
2012-09-01 12:35 [PATCH 00/18 v2] " Jean-Christophe PLAGNIOL-VILLARD
2012-09-01 12:37 ` [PATCH 01/18] fs: add " Jean-Christophe PLAGNIOL-VILLARD
2012-08-24  4:46 [PATCH 00/18] fs: add symlink and " Jean-Christophe PLAGNIOL-VILLARD
2012-08-24  4:50 ` [PATCH 01/18] fs: add " Jean-Christophe PLAGNIOL-VILLARD
2012-08-27 13:25   ` Sascha Hauer
2012-09-01 10:50     ` Jean-Christophe PLAGNIOL-VILLARD

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