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>
diff --git a/fs/jfs/jfs_dmap.c b/fs/jfs/jfs_dmap.c
index eadf319..51c02bf 100644
--- a/fs/jfs/jfs_dmap.c
+++ b/fs/jfs/jfs_dmap.c
@@ -305,7 +305,6 @@
filemap_fdatawrite(ipbmap->i_mapping);
filemap_fdatawait(ipbmap->i_mapping);
- ipbmap->i_state |= I_DIRTY;
diWriteSpecial(ipbmap, 0);
return (0);
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 @@
/* release the page */
release_metapage(mp);
+ hlist_add_head(&ip->i_hash, &aggregate_hash);
+
return (ip);
}
@@ -514,8 +522,6 @@
ino_t inum = ip->i_ino;
struct metapage *mp;
- ip->i_state &= ~I_DIRTY;
-
if (secondary)
address = addressPXD(&sbi->ait2) >> sbi->l2nbperpage;
else
diff --git a/fs/jfs/jfs_metapage.c b/fs/jfs/jfs_metapage.c
index 13d7e3f..c81c643 100644
--- a/fs/jfs/jfs_metapage.c
+++ b/fs/jfs/jfs_metapage.c
@@ -395,6 +395,12 @@
if (mp->nohomeok && !test_bit(META_forcewrite, &mp->flag)) {
redirty = 1;
+ /*
+ * Make sure this page isn't blocked indefinitely.
+ * If the journal isn't undergoing I/O, push it
+ */
+ if (mp->log && !(mp->log->cflag & logGC_PAGEOUT))
+ jfs_flush_journal(mp->log, 0);
continue;
}
diff --git a/fs/jfs/jfs_txnmgr.c b/fs/jfs/jfs_txnmgr.c
index 9b71ed2..b660c93 100644
--- a/fs/jfs/jfs_txnmgr.c
+++ b/fs/jfs/jfs_txnmgr.c
@@ -2396,7 +2396,6 @@
*/
if (tblk->xflag & COMMIT_CREATE) {
diUpdatePMap(ipimap, tblk->ino, FALSE, tblk);
- ipimap->i_state |= I_DIRTY;
/* update persistent block allocation map
* for the allocation of inode extent;
*/
@@ -2407,7 +2406,6 @@
} else if (tblk->xflag & COMMIT_DELETE) {
ip = tblk->u.ip;
diUpdatePMap(ipimap, ip->i_ino, TRUE, tblk);
- ipimap->i_state |= I_DIRTY;
iput(ip);
}
}
diff --git a/fs/jfs/super.c b/fs/jfs/super.c
index 71bc34b..4226af3 100644
--- a/fs/jfs/super.c
+++ b/fs/jfs/super.c
@@ -442,6 +442,7 @@
inode->i_nlink = 1;
inode->i_size = sb->s_bdev->bd_inode->i_size;
inode->i_mapping->a_ops = &jfs_metapage_aops;
+ insert_inode_hash(inode);
mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
sbi->direct_inode = inode;