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-rw-r--r--fs/ext3/super.c42
1 files changed, 42 insertions, 0 deletions
diff --git a/fs/ext3/super.c b/fs/ext3/super.c
index 813d589cc6c0..3559086eee5f 100644
--- a/fs/ext3/super.c
+++ b/fs/ext3/super.c
@@ -554,6 +554,47 @@ static int ext3_show_options(struct seq_file *seq, struct vfsmount *vfs)
554 return 0; 554 return 0;
555} 555}
556 556
557
558static struct dentry *ext3_get_dentry(struct super_block *sb, void *vobjp)
559{
560 __u32 *objp = vobjp;
561 unsigned long ino = objp[0];
562 __u32 generation = objp[1];
563 struct inode *inode;
564 struct dentry *result;
565
566 if (ino < EXT3_FIRST_INO(sb) && ino != EXT3_ROOT_INO)
567 return ERR_PTR(-ESTALE);
568 if (ino > le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count))
569 return ERR_PTR(-ESTALE);
570
571 /* iget isn't really right if the inode is currently unallocated!!
572 *
573 * ext3_read_inode will return a bad_inode if the inode had been
574 * deleted, so we should be safe.
575 *
576 * Currently we don't know the generation for parent directory, so
577 * a generation of 0 means "accept any"
578 */
579 inode = iget(sb, ino);
580 if (inode == NULL)
581 return ERR_PTR(-ENOMEM);
582 if (is_bad_inode(inode) ||
583 (generation && inode->i_generation != generation)) {
584 iput(inode);
585 return ERR_PTR(-ESTALE);
586 }
587 /* now to find a dentry.
588 * If possible, get a well-connected one
589 */
590 result = d_alloc_anon(inode);
591 if (!result) {
592 iput(inode);
593 return ERR_PTR(-ENOMEM);
594 }
595 return result;
596}
597
557#ifdef CONFIG_QUOTA 598#ifdef CONFIG_QUOTA
558#define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group") 599#define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
559#define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA)) 600#define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
@@ -622,6 +663,7 @@ static struct super_operations ext3_sops = {
622 663
623static struct export_operations ext3_export_ops = { 664static struct export_operations ext3_export_ops = {
624 .get_parent = ext3_get_parent, 665 .get_parent = ext3_get_parent,
666 .get_dentry = ext3_get_dentry,
625}; 667};
626 668
627enum { 669enum {