attr.c

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    1 /*
    2  *  linux/fs/attr.c
    3  *
    4  *  Copyright (C) 1991, 1992  Linus Torvalds
    5  *  changes by Thomas Schoebel-Theuer
    6  */
    7 
    8 #include <linux/sched.h>
    9 #include <linux/mm.h>
   10 #include <linux/string.h>
   11 #include <linux/smp_lock.h>
   12 #include <linux/dnotify.h>
   13 #include <linux/fcntl.h>
   14 #include <linux/quotaops.h>
   15 
   16 /* Taken over from the old code... */
   17 
   18 /* POSIX UID/GID verification for setting inode attributes. */
   19 int inode_change_ok(struct inode *inode, struct iattr *attr)
   20 {
   21         int retval = -EPERM;
   22         unsigned int ia_valid = attr->ia_valid;
   23 
   24         /* If force is set do it anyway. */
   25         if (ia_valid & ATTR_FORCE)
   26                 goto fine;
   27 
   28         /* Make sure a caller can chown. */
   29         if ((ia_valid & ATTR_UID) &&
   30             (current->fsuid != inode->i_uid ||
   31              attr->ia_uid != inode->i_uid) && !capable(CAP_CHOWN))
   32                 goto error;
   33 
   34         /* Make sure caller can chgrp. */
   35         if ((ia_valid & ATTR_GID) &&
   36             (!in_group_p(attr->ia_gid) && attr->ia_gid != inode->i_gid) &&
   37             !capable(CAP_CHOWN))
   38                 goto error;
   39 
   40         /* Make sure a caller can chmod. */
   41         if (ia_valid & ATTR_MODE) {
   42                 if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
   43                         goto error;
   44                 /* Also check the setgid bit! */
   45                 if (!in_group_p((ia_valid & ATTR_GID) ? attr->ia_gid :
   46                                 inode->i_gid) && !capable(CAP_FSETID))
   47                         attr->ia_mode &= ~S_ISGID;
   48         }
   49 
   50         /* Check for setting the inode time. */
   51         if (ia_valid & (ATTR_MTIME_SET | ATTR_ATIME_SET)) {
   52                 if (current->fsuid != inode->i_uid && !capable(CAP_FOWNER))
   53                         goto error;
   54         }
   55 fine:
   56         retval = 0;
   57 error:
   58         return retval;
   59 }
   60 
   61 int inode_setattr(struct inode * inode, struct iattr * attr)
   62 {
   63         unsigned int ia_valid = attr->ia_valid;
   64         int error = 0;
   65 
   66         if (ia_valid & ATTR_SIZE) {
   67                 error = vmtruncate(inode, attr->ia_size);
   68                 if (error)
   69                         goto out;
   70         }
   71 
   72         if (ia_valid & ATTR_UID)
   73                 inode->i_uid = attr->ia_uid;
   74         if (ia_valid & ATTR_GID)
   75                 inode->i_gid = attr->ia_gid;
   76         if (ia_valid & ATTR_ATIME)
   77                 inode->i_atime = attr->ia_atime;
   78         if (ia_valid & ATTR_MTIME)
   79                 inode->i_mtime = attr->ia_mtime;
   80         if (ia_valid & ATTR_CTIME)
   81                 inode->i_ctime = attr->ia_ctime;
   82         if (ia_valid & ATTR_MODE) {
   83                 inode->i_mode = attr->ia_mode;
   84                 if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID))
   85                         inode->i_mode &= ~S_ISGID;
   86         }
   87         mark_inode_dirty(inode);
   88 out:
   89         return error;
   90 }
   91 
   92 static int setattr_mask(unsigned int ia_valid)
   93 {
   94         unsigned long dn_mask = 0;
   95 
   96         if (ia_valid & ATTR_UID)
   97                 dn_mask |= DN_ATTRIB;
   98         if (ia_valid & ATTR_GID)
   99                 dn_mask |= DN_ATTRIB;
  100         if (ia_valid & ATTR_SIZE)
  101                 dn_mask |= DN_MODIFY;
  102         /* both times implies a utime(s) call */
  103         if ((ia_valid & (ATTR_ATIME|ATTR_MTIME)) == (ATTR_ATIME|ATTR_MTIME))
  104                 dn_mask |= DN_ATTRIB;
  105         else if (ia_valid & ATTR_ATIME)
  106                 dn_mask |= DN_ACCESS;
  107         else if (ia_valid & ATTR_MTIME)
  108                 dn_mask |= DN_MODIFY;
  109         if (ia_valid & ATTR_MODE)
  110                 dn_mask |= DN_ATTRIB;
  111         return dn_mask;
  112 }
  113 
  114 int notify_change(struct dentry * dentry, struct iattr * attr)
  115 {
  116         struct inode *inode = dentry->d_inode;
  117         int error;
  118         time_t now = CURRENT_TIME;
  119         unsigned int ia_valid = attr->ia_valid;
  120 
  121         if (!inode)
  122                 BUG();
  123 
  124         attr->ia_ctime = now;
  125         if (!(ia_valid & ATTR_ATIME_SET))
  126                 attr->ia_atime = now;
  127         if (!(ia_valid & ATTR_MTIME_SET))
  128                 attr->ia_mtime = now;
  129 
  130         lock_kernel();
  131         if (inode->i_op && inode->i_op->setattr) 
  132                 error = inode->i_op->setattr(dentry, attr);
  133         else {
  134                 error = inode_change_ok(inode, attr);
  135                 if (!error) {
  136                         if ((ia_valid & ATTR_UID && attr->ia_uid != inode->i_uid) ||
  137                             (ia_valid & ATTR_GID && attr->ia_gid != inode->i_gid))
  138                                 error = DQUOT_TRANSFER(inode, attr) ? -EDQUOT : 0;
  139                         if (!error)
  140                                 error = inode_setattr(inode, attr);
  141                 }
  142         }
  143         unlock_kernel();
  144         if (!error) {
  145                 unsigned long dn_mask = setattr_mask(ia_valid);
  146                 if (dn_mask)
  147                         dnotify_parent(dentry, dn_mask);
  148         }
  149         return error;
  150 }

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FreeBSD/Linux Kernel Cross Reference sys/fs/attr.c

FreeBSD/Linux Kernel Cross Reference
sys/fs/attr.c