[PATCH 07/18] ramfs: add symlink and readlink support

[Jean-Christophe PLAGNIOL-VILLARD]

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagn...@jcrosoft.com>
---
 fs/ramfs.c |   61 ++++++++++++++++++++++++++++++++++++++++++++++++++++++------
 1 file changed, 55 insertions(+), 6 deletions(-)

diff --git a/fs/ramfs.c b/fs/ramfs.c
index 91d06b8..8f3b936 100644
--- a/fs/ramfs.c
+++ b/fs/ramfs.c
@@ -42,6 +42,7 @@ struct ramfs_inode {
        struct ramfs_inode *parent;
        struct ramfs_inode *next;
        struct ramfs_inode *child;
+       char *symlink;
        ulong mode;
 
        struct handle_d *handle;
@@ -176,6 +177,7 @@ static void ramfs_put_inode(struct ramfs_inode *node)
                data = tmp;
        }
 
+       free(node->symlink);
        free(node->name);
        free(node);
 }
@@ -212,18 +214,38 @@ static struct ramfs_inode* node_insert(struct ramfs_inode 
*parent_node, const ch
 
 /* ---------------------------------------------------------------*/
 
-static int ramfs_create(struct device_d *dev, const char *pathname, mode_t 
mode)
+static int __ramfs_create(struct device_d *dev, const char *pathname,
+                         mode_t mode, const char *symlink)
 {
        struct ramfs_priv *priv = dev->priv;
        struct ramfs_inode *node;
        char *file;
+       char *__symlink = NULL;
 
        node = rlookup_parent(priv, pathname, &file);
-       if (node) {
-               node_insert(node, file, mode);
-               return 0;
+       if (!node)
+               return -ENOENT;
+
+       if (symlink) {
+               __symlink = strdup(symlink);
+               if (!__symlink)
+                       return -ENOMEM;
        }
-       return -ENOENT;
+
+       node = node_insert(node, file, mode);
+       if (!node) {
+               free(__symlink);
+               return -ENOMEM;
+       }
+
+       node->symlink = __symlink;
+
+       return 0;
+}
+
+static int ramfs_create(struct device_d *dev, const char *pathname, mode_t 
mode)
+{
+       return __ramfs_create(dev, pathname, mode, NULL);
 }
 
 static int ramfs_unlink(struct device_d *dev, const char *pathname)
@@ -532,12 +554,37 @@ static int ramfs_stat(struct device_d *dev, const char 
*filename, struct stat *s
        if (!node)
                return -ENOENT;
 
-       s->st_size = node->size;
+       s->st_size = node->symlink ? strlen(node->symlink) : node->size;
        s->st_mode = node->mode;
 
        return 0;
 }
 
+static int ramfs_symlink(struct device_d *dev, const char *pathname,
+                      const char *newpath)
+{
+       mode_t mode = S_IFLNK | S_IRWXU | S_IRWXG | S_IRWXO;
+
+       return __ramfs_create(dev, newpath, mode, pathname);
+}
+
+static int ramfs_readlink(struct device_d *dev, const char *pathname,
+                       char *buf, size_t bufsiz)
+{
+       struct ramfs_priv *priv = dev->priv;
+       struct ramfs_inode *node = rlookup(priv, pathname);
+       int len;
+
+       if (!node || !node->symlink)
+               return -ENOENT;
+
+       len = min(bufsiz, strlen(node->symlink));
+
+       memcpy(buf, node->symlink, len);
+
+       return 0;
+}
+
 static int ramfs_probe(struct device_d *dev)
 {
        struct ramfs_inode *n;
@@ -584,6 +631,8 @@ static struct fs_driver_d ramfs_driver = {
        .readdir   = ramfs_readdir,
        .closedir  = ramfs_closedir,
        .stat      = ramfs_stat,
+       .symlink   = ramfs_symlink,
+       .readlink  = ramfs_readlink,
        .flags     = FS_DRIVER_NO_DEV,
        .drv = {
                .probe  = ramfs_probe,
-- 
1.7.10.4


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