#include <linux/mm.h>
#include <linux/string.h>
#include <linux/smp_lock.h>
-#include <linux/dnotify.h>
+#include <linux/capability.h>
+#include <linux/fsnotify.h>
#include <linux/fcntl.h>
#include <linux/quotaops.h>
#include <linux/security.h>
+#include <linux/proc_fs.h>
+#include <linux/devpts_fs.h>
+#include <linux/vs_base.h>
/* Taken over from the old code... */
/* Make sure caller can chgrp. */
if ((ia_valid & ATTR_GID) &&
- (!in_group_p(attr->ia_gid) && attr->ia_gid != inode->i_gid) &&
+ (current->fsuid != inode->i_uid ||
+ (!in_group_p(attr->ia_gid) && attr->ia_gid != inode->i_gid)) &&
!capable(CAP_CHOWN))
goto error;
if (current->fsuid != inode->i_uid && !capable(CAP_FOWNER))
goto error;
}
+
+ /* Check for evil vserver activity */
+ if (vx_check(0, VS_ADMIN))
+ goto fine;
+
+ if (IS_BARRIER(inode)) {
+ vxwprintk(1, "xid=%d messing with the barrier.",
+ vx_current_xid());
+ goto error;
+ }
+ switch (inode->i_sb->s_magic) {
+ case PROC_SUPER_MAGIC:
+ /* maybe allow that in the future? */
+ vxwprintk(1, "xid=%d messing with the procfs.",
+ vx_current_xid());
+ goto error;
+ case DEVPTS_SUPER_MAGIC:
+ /* devpts is xid tagged */
+ if (vx_check((xid_t)inode->i_tag, VS_IDENT))
+ goto fine;
+ vxwprintk(1, "xid=%d messing with the devpts.",
+ vx_current_xid());
+ goto error;
+ }
fine:
retval = 0;
error:
int inode_setattr(struct inode * inode, struct iattr * attr)
{
unsigned int ia_valid = attr->ia_valid;
- int error = 0;
-
- if (ia_valid & ATTR_SIZE) {
- if (attr->ia_size != i_size_read(inode)) {
- error = vmtruncate(inode, attr->ia_size);
- if (error || (ia_valid == ATTR_SIZE))
- goto out;
- } else {
- /*
- * We skipped the truncate but must still update
- * timestamps
- */
- ia_valid |= ATTR_MTIME|ATTR_CTIME;
- }
+
+ if (ia_valid & ATTR_SIZE &&
+ attr->ia_size != i_size_read(inode)) {
+ int error = vmtruncate(inode, attr->ia_size);
+ if (error)
+ return error;
}
if (ia_valid & ATTR_UID)
inode->i_uid = attr->ia_uid;
if (ia_valid & ATTR_GID)
inode->i_gid = attr->ia_gid;
+ if ((ia_valid & ATTR_TAG) && IS_TAGGED(inode))
+ inode->i_tag = attr->ia_tag;
if (ia_valid & ATTR_ATIME)
- inode->i_atime = attr->ia_atime;
+ inode->i_atime = timespec_trunc(attr->ia_atime,
+ inode->i_sb->s_time_gran);
if (ia_valid & ATTR_MTIME)
- inode->i_mtime = attr->ia_mtime;
+ inode->i_mtime = timespec_trunc(attr->ia_mtime,
+ inode->i_sb->s_time_gran);
if (ia_valid & ATTR_CTIME)
- inode->i_ctime = attr->ia_ctime;
+ inode->i_ctime = timespec_trunc(attr->ia_ctime,
+ inode->i_sb->s_time_gran);
if (ia_valid & ATTR_MODE) {
umode_t mode = attr->ia_mode;
inode->i_mode = mode;
}
mark_inode_dirty(inode);
-out:
- return error;
-}
-
-EXPORT_SYMBOL(inode_setattr);
-
-int setattr_mask(unsigned int ia_valid)
-{
- unsigned long dn_mask = 0;
- if (ia_valid & ATTR_UID)
- dn_mask |= DN_ATTRIB;
- if (ia_valid & ATTR_GID)
- dn_mask |= DN_ATTRIB;
- if (ia_valid & ATTR_SIZE)
- dn_mask |= DN_MODIFY;
- /* both times implies a utime(s) call */
- if ((ia_valid & (ATTR_ATIME|ATTR_MTIME)) == (ATTR_ATIME|ATTR_MTIME))
- dn_mask |= DN_ATTRIB;
- else if (ia_valid & ATTR_ATIME)
- dn_mask |= DN_ACCESS;
- else if (ia_valid & ATTR_MTIME)
- dn_mask |= DN_MODIFY;
- if (ia_valid & ATTR_MODE)
- dn_mask |= DN_ATTRIB;
- return dn_mask;
+ return 0;
}
+EXPORT_SYMBOL(inode_setattr);
int notify_change(struct dentry * dentry, struct iattr * attr)
{
struct inode *inode = dentry->d_inode;
- mode_t mode = inode->i_mode;
+ mode_t mode;
int error;
- struct timespec now = CURRENT_TIME;
+ struct timespec now;
unsigned int ia_valid = attr->ia_valid;
- if (!inode)
- BUG();
+ mode = inode->i_mode;
+ now = current_fs_time(inode->i_sb);
attr->ia_ctime = now;
if (!(ia_valid & ATTR_ATIME_SET))
if (!attr->ia_valid)
return 0;
+ if (ia_valid & ATTR_SIZE)
+ down_write(&dentry->d_inode->i_alloc_sem);
+
if (inode->i_op && inode->i_op->setattr) {
error = security_inode_setattr(dentry, attr);
if (!error)
error = security_inode_setattr(dentry, attr);
if (!error) {
if ((ia_valid & ATTR_UID && attr->ia_uid != inode->i_uid) ||
- (ia_valid & ATTR_GID && attr->ia_gid != inode->i_gid))
+ (ia_valid & ATTR_GID && attr->ia_gid != inode->i_gid) ||
+ (ia_valid & ATTR_TAG && attr->ia_tag != inode->i_tag))
error = DQUOT_TRANSFER(inode, attr) ? -EDQUOT : 0;
if (!error)
error = inode_setattr(inode, attr);
}
}
- if (!error) {
- unsigned long dn_mask = setattr_mask(ia_valid);
- if (dn_mask)
- dnotify_parent(dentry, dn_mask);
- }
+
+ if (ia_valid & ATTR_SIZE)
+ up_write(&dentry->d_inode->i_alloc_sem);
+
+ if (!error)
+ fsnotify_change(dentry, ia_valid);
+
return error;
}