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From: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
To: barebox@lists.infradead.org
Subject: [PATCH 04/19] fs: add symlink support
Date: Tue,  4 Sep 2012 21:50:02 +0200	[thread overview]
Message-ID: <1346788217-16042-4-git-send-email-plagnioj@jcrosoft.com> (raw)
In-Reply-To: <1346788217-16042-1-git-send-email-plagnioj@jcrosoft.com>

Limit it's support to existing file only

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
---
 fs/fs.c      |   51 +++++++++++++++++++++++++++++++++++++++++++++++++++
 include/fs.h |    3 +++
 2 files changed, 54 insertions(+)

diff --git a/fs/fs.c b/fs/fs.c
index 323b6c2..f46c606 100644
--- a/fs/fs.c
+++ b/fs/fs.c
@@ -927,6 +927,57 @@ out:
 }
 EXPORT_SYMBOL(readlink);
 
+int symlink(const char *pathname, const char *newpath)
+{
+	struct fs_driver_d *fsdrv;
+	struct fs_device_d *fsdev;
+	char *p;
+	char *freep = normalise_path(pathname);
+	int ret;
+	struct stat s;
+
+	if (!freep)
+		return -ENOMEM;
+
+	if (!stat(freep, &s) && S_ISDIR(s.st_mode)) {
+		ret = -ENOSYS;
+		goto out;
+	}
+
+	free(freep);
+	freep = p = normalise_path(newpath);
+
+	if (!p)
+		return -ENOMEM;
+
+	ret = lstat(p, &s);
+	if (!ret) {
+		ret = -EEXIST;
+		goto out;
+	}
+
+	fsdev = get_fs_device_and_root_path(&p);
+	if (!fsdev) {
+		ret = -ENODEV;
+		goto out;
+	}
+	fsdrv = fsdev->driver;
+
+	if (fsdrv->symlink) {
+		ret = fsdrv->symlink(&fsdev->dev, pathname, p);
+	} else {
+		ret = -EPERM;
+	}
+
+out:
+	free(freep);
+	if (ret)
+		errno = -ret;
+
+	return ret;
+}
+EXPORT_SYMBOL(symlink);
+
 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 98210cf..d96de0e 100644
--- a/include/fs.h
+++ b/include/fs.h
@@ -50,6 +50,8 @@ struct fs_driver_d {
 	/* Truncate a file to given size */
 	int (*truncate)(struct device_d *dev, FILE *f, ulong size);
 
+	int (*symlink)(struct device_d *dev, const char *pathname,
+		       const char *newpath);
 	int (*readlink)(struct device_d *dev, const char *pathname, char *name,
 			size_t size);
 
@@ -131,6 +133,7 @@ DIR *opendir(const char *pathname);
 struct dirent *readdir(DIR *dir);
 int closedir(DIR *dir);
 
+int symlink(const char *pathname, const char *newpath);
 int readlink(const char *path, char *buf, size_t bufsiz);
 
 int mount (const char *device, const char *fsname, const char *path);
-- 
1.7.10.4


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  parent reply	other threads:[~2012-09-04 19:50 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-09-04 19:47 [PATCH 00/18 v5] fs: add symlink and readlink support Jean-Christophe PLAGNIOL-VILLARD
2012-09-04 19:49 ` [PATCH 01/19] fs: add " Jean-Christophe PLAGNIOL-VILLARD
2012-09-04 19:50   ` [PATCH 02/19] fs: fix rmdir with symlink Jean-Christophe PLAGNIOL-VILLARD
2012-09-04 19:50   ` [PATCH 03/19] fs: rename stat to lstat as we implement lstat Jean-Christophe PLAGNIOL-VILLARD
2012-09-04 19:50   ` Jean-Christophe PLAGNIOL-VILLARD [this message]
2012-09-04 19:50   ` [PATCH 05/19] fs: implement stat Jean-Christophe PLAGNIOL-VILLARD
2012-09-04 19:50   ` [PATCH 06/19] fs: open: add symlink support Jean-Christophe PLAGNIOL-VILLARD
2012-09-04 19:50   ` [PATCH 07/19] fs: introduce get_mounted_path to get the path where a file is mounted Jean-Christophe PLAGNIOL-VILLARD
2012-09-04 19:50   ` [PATCH 08/19] ramfs: add symlink and readlink support Jean-Christophe PLAGNIOL-VILLARD
2012-09-04 19:50   ` [PATCH 09/19] nfs: add " Jean-Christophe PLAGNIOL-VILLARD
2012-09-04 19:50   ` [PATCH 10/19] test: add -L support to test if it's a symbolic link Jean-Christophe PLAGNIOL-VILLARD
2012-09-04 19:50   ` [PATCH 11/19] command: add readlink support Jean-Christophe PLAGNIOL-VILLARD
2012-09-04 19:50   ` [PATCH 12/19] command: add ln support Jean-Christophe PLAGNIOL-VILLARD
2012-09-04 19:50   ` [PATCH 13/19] ls: add symlink support to -l Jean-Christophe PLAGNIOL-VILLARD
2012-09-04 19:50   ` [PATCH 14/19] dirname: add -V option to return only path related to the mountpoint Jean-Christophe PLAGNIOL-VILLARD
2012-09-04 19:50   ` [PATCH 15/19] recursive_action: add ACTION_FOLLOWLINKS support Jean-Christophe PLAGNIOL-VILLARD
2012-09-04 19:50   ` [PATCH 16/19] envfs: introduce version major and minor Jean-Christophe PLAGNIOL-VILLARD
2012-09-04 19:50   ` [PATCH 17/19] envfs: add support of variable inode size Jean-Christophe PLAGNIOL-VILLARD
2012-09-04 19:50   ` [PATCH 18/19] envfs: add support of symlink Jean-Christophe PLAGNIOL-VILLARD
2012-09-04 19:50   ` [PATCH 19/19] defautenv: " Jean-Christophe PLAGNIOL-VILLARD

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