diff options
Diffstat (limited to 'src/VBox/Additions/linux/sharedfolders/lnkops.c')
| -rw-r--r-- | src/VBox/Additions/linux/sharedfolders/lnkops.c | 119 |
1 files changed, 119 insertions, 0 deletions
diff --git a/src/VBox/Additions/linux/sharedfolders/lnkops.c b/src/VBox/Additions/linux/sharedfolders/lnkops.c new file mode 100644 index 00000000..d735b677 --- /dev/null +++ b/src/VBox/Additions/linux/sharedfolders/lnkops.c @@ -0,0 +1,119 @@ +/* $Id: lnkops.c $ */ +/** @file + * vboxsf - VBox Linux Shared Folders VFS, operations for symbolic links. + */ + +/* + * Copyright (C) 2010-2019 Oracle Corporation + * + * Permission is hereby granted, free of charge, to any person + * obtaining a copy of this software and associated documentation + * files (the "Software"), to deal in the Software without + * restriction, including without limitation the rights to use, + * copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following + * conditions: + * + * The above copyright notice and this permission notice shall be + * included in all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES + * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT + * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, + * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR + * OTHER DEALINGS IN THE SOFTWARE. + */ + +#include "vfsmod.h" + +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0) + +# if LINUX_VERSION_CODE < KERNEL_VERSION(4, 5, 0) +# if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 2, 0) +static const char *sf_follow_link(struct dentry *dentry, void **cookie) +# else +static void *sf_follow_link(struct dentry *dentry, struct nameidata *nd) +# endif +{ + struct inode *inode = dentry->d_inode; + struct sf_glob_info *sf_g = GET_GLOB_INFO(inode->i_sb); + struct sf_inode_info *sf_i = GET_INODE_INFO(inode); + int error = -ENOMEM; + char *path = (char *)get_zeroed_page(GFP_KERNEL); + int rc; + + if (path) { + error = 0; + rc = VbglR0SfReadLink(&client_handle, &sf_g->map, sf_i->path, + PATH_MAX, path); + if (RT_FAILURE(rc)) { + LogFunc(("VbglR0SfReadLink failed, caller=%s, rc=%Rrc\n", __func__, rc)); + free_page((unsigned long)path); + error = -EPROTO; + } + } +# if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 2, 0) + return error ? ERR_PTR(error) : (*cookie = path); +# else + nd_set_link(nd, error ? ERR_PTR(error) : path); + return NULL; +# endif +} + +# if LINUX_VERSION_CODE < KERNEL_VERSION(4, 2, 0) +static void sf_put_link(struct dentry *dentry, struct nameidata *nd, + void *cookie) +{ + char *page = nd_get_link(nd); + if (!IS_ERR(page)) + free_page((unsigned long)page); +} +# endif + +# else /* LINUX_VERSION_CODE >= 4.5.0 */ +static const char *sf_get_link(struct dentry *dentry, struct inode *inode, + struct delayed_call *done) +{ + struct sf_glob_info *sf_g = GET_GLOB_INFO(inode->i_sb); + struct sf_inode_info *sf_i = GET_INODE_INFO(inode); + char *path; + int rc; + + if (!dentry) + return ERR_PTR(-ECHILD); + path = kzalloc(PAGE_SIZE, GFP_KERNEL); + if (!path) + return ERR_PTR(-ENOMEM); + rc = VbglR0SfReadLink(&client_handle, &sf_g->map, sf_i->path, PATH_MAX, + path); + if (RT_FAILURE(rc)) { + LogFunc(("VbglR0SfReadLink failed, caller=%s, rc=%Rrc\n", + __func__, rc)); + kfree(path); + return ERR_PTR(-EPROTO); + } + set_delayed_call(done, kfree_link, path); + return path; +} +# endif /* LINUX_VERSION_CODE >= 4.5.0 */ + +struct inode_operations sf_lnk_iops = { +# if LINUX_VERSION_CODE < KERNEL_VERSION(4, 10, 0) + .readlink = generic_readlink, +# endif +# if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 5, 0) + .get_link = sf_get_link +# elif LINUX_VERSION_CODE >= KERNEL_VERSION(4, 2, 0) + .follow_link = sf_follow_link, + .put_link = free_page_put_link, +# else + .follow_link = sf_follow_link, + .put_link = sf_put_link +# endif +}; + +#endif /* LINUX_VERSION_CODE >= 2.6.0 */ |