Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 | /* * Pioctl operations for Coda. * Original version: (C) 1996 Peter Braam * Rewritten for Linux 2.1: (C) 1997 Carnegie Mellon University * * Carnegie Mellon encourages users of this code to contribute improvements * to the Coda project. Contact Peter Braam <coda@cs.cmu.edu>. */ #include <linux/types.h> #include <linux/kernel.h> #include <linux/sched.h> #include <linux/fs.h> #include <linux/stat.h> #include <linux/errno.h> #include <linux/locks.h> #include <asm/segment.h> #include <linux/string.h> #include <asm/uaccess.h> #include <linux/coda.h> #include <linux/coda_linux.h> #include <linux/coda_fs_i.h> #include <linux/coda_cache.h> #include <linux/coda_psdev.h> /* pioctl ops */ static int coda_ioctl_permission(struct inode *inode, int mask); static int coda_ioctl_open(struct inode *i, struct file *f); static int coda_ioctl_release(struct inode *i, struct file *f); static int coda_pioctl(struct inode * inode, struct file * filp, unsigned int cmd, unsigned long arg); /* exported from this file */ struct inode_operations coda_ioctl_inode_operations = { &coda_ioctl_operations, NULL, /* create */ NULL, /* lookup */ NULL, /* link */ NULL, /* unlink */ NULL, /* symlink */ NULL, /* mkdir */ NULL, /* rmdir */ NULL, /* mknod */ NULL, /* rename */ NULL, /* readlink */ NULL, /* follow_link */ NULL, /* readpage */ NULL, /* writepage */ NULL, /* bmap */ NULL, /* truncate */ coda_ioctl_permission, /* permission */ NULL, /* smap */ NULL, /* update page */ NULL /* revalidate */ }; struct file_operations coda_ioctl_operations = { NULL, /* lseek - default should work for coda */ NULL, /* read */ NULL, /* write */ NULL, /* readdir */ NULL, /* select - default */ coda_pioctl, /* ioctl */ NULL, /* mmap */ coda_ioctl_open, /* open */ NULL, coda_ioctl_release, /* release */ NULL, /* fsync */ }; /* the coda pioctl inode ops */ static int coda_ioctl_permission(struct inode *inode, int mask) { ENTRY; return 0; } /* The pioctl file ops*/ int coda_ioctl_open(struct inode *i, struct file *f) { ENTRY; CDEBUG(D_PIOCTL, "File inode number: %ld\n", f->f_dentry->d_inode->i_ino); EXIT; return 0; } int coda_ioctl_release(struct inode *i, struct file *f) { return 0; } static int coda_pioctl(struct inode * inode, struct file * filp, unsigned int cmd, unsigned long user_data) { struct dentry *target_de; int error; struct PioctlData data; struct inode *target_inode = NULL; struct coda_inode_info *cnp; ENTRY; /* get the Pioctl data arguments from user space */ if (copy_from_user(&data, (int *)user_data, sizeof(data))) { return -EINVAL; } /* * Look up the pathname. Note that the pathname is in * user memory, and namei takes care of this */ CDEBUG(D_PIOCTL, "namei, data.follow = %d\n", data.follow); if ( data.follow ) { target_de = namei(data.path); } else { target_de = lnamei(data.path); } if ( IS_ERR(target_de) ) { CDEBUG(D_PIOCTL, "error: lookup fails.\n"); return PTR_ERR(target_de); } else { target_inode = target_de->d_inode; } CDEBUG(D_PIOCTL, "target ino: 0x%ld, dev: 0x%d\n", target_inode->i_ino, target_inode->i_dev); /* return if it is not a Coda inode */ if ( target_inode->i_sb != inode->i_sb ) { if ( target_de ) dput(target_de); return -EINVAL; } /* now proceed to make the upcall */ cnp = ITOC(target_inode); error = venus_pioctl(inode->i_sb, &(cnp->c_fid), cmd, &data); CDEBUG(D_PIOCTL, "ioctl on inode %ld\n", target_inode->i_ino); CDEBUG(D_DOWNCALL, "dput on ino: %ld, icount %d, dcount %d\n", target_inode->i_ino, target_inode->i_count, target_de->d_count); if ( target_de ) dput(target_de); return error; } |