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ramfs: add symlink and readlink support 

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
This commit is contained in:
Jean-Christophe PLAGNIOL-VILLARD 2012-08-21 17:23:48 +08:00
parent 1483f45879
commit ad6c28ac41
1 changed files with 55 additions and 6 deletions
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61
fs/ramfs.c
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@ -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,