JFS: make special inodes play nicely with page balancing

This patch fixes up a few problems with jfs's reserved inodes.

1. There is no need for the jfs code setting the I_DIRTY bits in i_state.
   I am ashamed that the code ever did this, and surprised it hasn't been
   noticed until now.

2. Make sure special inodes are on an inode hash list.  If the inodes are
   unhashed, __mark_inode_dirty will fail to put the inode on the
   superblock's dirty list, and the data will not be flushed under memory
   pressure.

3. Force writing journal data to disk when metapage_writepage is unable to
   write a metadata page due to pending journal I/O.

Signed-off-by: Dave Kleikamp <shaggy@austin.ibm.com>

1 files changed, 8 insertions, 2 deletions

diff --git a/fs/jfs/jfs_imap.c b/fs/jfs/jfs_imap.c
index 4021d46..28201b1 100644
--- a/fs/jfs/jfs_imap.c
+++ b/fs/jfs/jfs_imap.c
@@ -57,6 +57,12 @@
 #include "jfs_debug.h"
 
 /*
+ * __mark_inode_dirty expects inodes to be hashed.  Since we don't want
+ * special inodes in the fileset inode space, we hash them to a dummy head
+ */
+static HLIST_HEAD(aggregate_hash);
+
+/*
  * imap locks
  */
 /* iag free list lock */
@@ -491,6 +497,8 @@ struct inode *diReadSpecial(struct super_block *sb, ino_t inum, int secondary)
 	/* release the page */
 	release_metapage(mp);
 
+	hlist_add_head(&ip->i_hash, &aggregate_hash);
+
 	return (ip);
 }
 
@@ -514,8 +522,6 @@ void diWriteSpecial(struct inode *ip, int secondary)
 	ino_t inum = ip->i_ino;
 	struct metapage *mp;
 
-	ip->i_state &= ~I_DIRTY;
-
 	if (secondary)
 		address = addressPXD(&sbi->ait2) >> sbi->l2nbperpage;
 	else