Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <[email protected]>
---
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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