Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <[email protected]>
---
fs/devfs.c | 70 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
include/driver.h | 1 +
2 files changed, 71 insertions(+)
diff --git a/fs/devfs.c b/fs/devfs.c
index f089c6f..c0047e3 100644
--- a/fs/devfs.c
+++ b/fs/devfs.c
@@ -216,6 +216,12 @@ static int devfs_stat(struct device_d *_dev, const char
*filename, struct stat *
if (!cdev)
return -ENOENT;
+ if (cdev->symlink) {
+ s->st_mode = S_IFLNK | S_IRWXU | S_IRWXG | S_IRWXO;
+ s->st_size = strlen(cdev->symlink);
+ return 0;
+ }
+
s->st_mode = S_IFCHR;
s->st_size = cdev->size;
if (cdev->ops->write)
@@ -235,7 +241,69 @@ static void devfs_delete(struct device_d *dev)
{
}
+static int devfs_symlink(struct device_d *dev, const char *pathname,
+ const char *newpath)
+{
+ struct cdev *cdev;
+ int ret = -ENOMEM;
+
+ cdev = kzalloc(sizeof(*cdev), GFP_KERNEL);
+ if (!cdev)
+ return -ENOMEM;
+
+ cdev->symlink = strdup(pathname);
+ if (!cdev->symlink)
+ goto err;
+
+ cdev->name = strdup(newpath + 1);
+ if (!cdev->name)
+ goto err_cdev;
+
+ ret = devfs_create(cdev);
+ if (ret)
+ goto err_create;
+
+ return 0;
+
+err_create:
+ kfree(cdev->name);
+err_cdev:
+ kfree(cdev->symlink);
+err:
+ kfree(cdev);
+ return ret;
+}
+
+static int devfs_readlink(struct device_d *dev, const char *pathname,
+ char *buf, size_t bufsiz)
+{
+ struct cdev *cdev;
+ int len;
+
+ cdev = cdev_by_name(pathname + 1);
+ if (!cdev || !cdev->symlink)
+ return -ENOENT;
+
+ len = min(bufsiz, strlen(cdev->symlink));
+
+ memcpy(buf, cdev->symlink, len);
+
+ return 0;
+}
+
+static int devfs_unlink(struct device_d *dev, const char *pathname)
+{
+ struct cdev *cdev;
+
+ cdev = cdev_by_name(pathname + 1);
+ if (!cdev || !cdev->symlink)
+ return -EPERM;
+
+ return devfs_remove(cdev);
+}
+
static struct fs_driver_d devfs_driver = {
+ .unlink = devfs_unlink,
.read = devfs_read,
.write = devfs_write,
.lseek = devfs_lseek,
@@ -248,6 +316,8 @@ static struct fs_driver_d devfs_driver = {
.truncate = devfs_truncate,
.closedir = devfs_closedir,
.stat = devfs_stat,
+ .symlink = devfs_symlink,
+ .readlink = devfs_readlink,
.erase = devfs_erase,
.protect = devfs_protect,
.memmap = devfs_memmap,
diff --git a/include/driver.h b/include/driver.h
index 151829e..1b0e619 100644
--- a/include/driver.h
+++ b/include/driver.h
@@ -432,6 +432,7 @@ struct cdev {
loff_t size;
unsigned int flags;
int open;
+ char *symlink;
struct mtd_info *mtd;
};
--
1.7.10.4
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