1 /* This file contains mount and unmount functionality. 2 * 3 * The entry points into this file are: 4 * do_mount perform the READSUPER file system call 5 * do_unmount perform the UNMOUNT file system call 6 * 7 * Created: 8 * April 2009 (D.C. van Moolenbroek) 9 */ 10 11 #include "inc.h" 12 13 /*===========================================================================* 14 * do_mount * 15 *===========================================================================*/ 16 int do_mount(dev_t dev, unsigned int flags, struct fsdriver_node *root_node, 17 unsigned int *res_flags) 18 { 19 /* Mount the file system. 20 */ 21 char path[PATH_MAX]; 22 struct inode *ino; 23 struct sffs_attr attr; 24 int r; 25 26 dprintf(("%s: mount (dev %"PRIx64", flags %x)\n", sffs_name, dev, flags)); 27 28 if (flags & REQ_ISROOT) { 29 printf("%s: attempt to mount as root device\n", sffs_name); 30 31 return EINVAL; 32 } 33 34 state.s_read_only = !!(flags & REQ_RDONLY); 35 state.s_dev = dev; 36 37 init_dentry(); 38 ino = init_inode(); 39 40 attr.a_mask = SFFS_ATTR_MODE | SFFS_ATTR_SIZE; 41 42 /* We cannot continue if we fail to get the properties of the root inode at 43 * all, because we cannot guess the details of the root node to return to 44 * VFS. Print a (hopefully) helpful error message, and abort the mount. 45 */ 46 if ((r = verify_inode(ino, path, &attr)) != OK) { 47 if (r == EAGAIN) 48 printf("%s: shared folders disabled\n", sffs_name); 49 else if (sffs_params->p_prefix[0] && (r == ENOENT || r == EACCES)) 50 printf("%s: unable to access the given prefix directory\n", 51 sffs_name); 52 else 53 printf("%s: unable to access shared folders\n", sffs_name); 54 55 return r; 56 } 57 58 root_node->fn_ino_nr = INODE_NR(ino); 59 root_node->fn_mode = get_mode(ino, attr.a_mode); 60 root_node->fn_size = attr.a_size; 61 root_node->fn_uid = sffs_params->p_uid; 62 root_node->fn_gid = sffs_params->p_gid; 63 root_node->fn_dev = NO_DEV; 64 65 *res_flags = RES_64BIT; 66 67 return OK; 68 } 69 70 /*===========================================================================* 71 * do_unmount * 72 *===========================================================================*/ 73 void do_unmount(void) 74 { 75 /* Unmount the file system. 76 */ 77 struct inode *ino; 78 79 dprintf(("%s: unmount\n", sffs_name)); 80 81 /* Decrease the reference count of the root inode. */ 82 if ((ino = find_inode(ROOT_INODE_NR)) == NULL) 83 return; 84 85 put_inode(ino); 86 87 /* There should not be any referenced inodes anymore now. */ 88 if (have_used_inode()) 89 printf("%s: in-use inodes left at unmount time!\n", sffs_name); 90 } 91