ping On 12:35 Sat 16 Feb , Jean-Christophe PLAGNIOL-VILLARD wrote: > 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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