4 files changed, 54 insertions, 10 deletions

diff --git a/fs/ocfs2/aops.c b/fs/ocfs2/aops.c
index ef6cd30108a9..93628b02ef5d 100644
--- a/fs/ocfs2/aops.c
+++ b/fs/ocfs2/aops.c
@@ -540,8 +540,7 @@ static int ocfs2_direct_IO_get_blocks(struct inode *inode, sector_t iblock,
                                      struct buffer_head *bh_result, int create)
 {
         int ret;
-        u64 vbo_max; /* file offset, max_blocks from iblock */
-        u64 p_blkno;
+        u64 p_blkno, inode_blocks;
         int contig_blocks;
         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
         unsigned long max_blocks = bh_result->b_size >> inode->i_blkbits;
@@ -550,12 +549,23 @@ static int ocfs2_direct_IO_get_blocks(struct inode *inode, sector_t iblock,
          * nicely aligned and of the right size, so there's no need
          * for us to check any of that. */
 
-        vbo_max = ((u64)iblock + max_blocks) << blocksize_bits;
-
         spin_lock(&OCFS2_I(inode)->ip_lock);
-        if ((iblock + max_blocks) >
-            ocfs2_clusters_to_blocks(inode->i_sb,
-                                     OCFS2_I(inode)->ip_clusters)) {
+        inode_blocks = ocfs2_clusters_to_blocks(inode->i_sb,
+                                                OCFS2_I(inode)->ip_clusters);
+
+        /*
+         * For a read which begins past the end of file, we return a hole.
+         */
+        if (!create && (iblock >= inode_blocks)) {
+                spin_unlock(&OCFS2_I(inode)->ip_lock);
+                ret = 0;
+                goto bail;
+        }
+
+        /*
+         * Any write past EOF is not allowed because we'd be extending.
+         */
+        if (create && (iblock + max_blocks) > inode_blocks) {
                 spin_unlock(&OCFS2_I(inode)->ip_lock);
                 ret = -EIO;
                 goto bail;
diff --git a/fs/ocfs2/cluster/heartbeat.c b/fs/ocfs2/cluster/heartbeat.c
index a25ef5a50386..277ca67a2ad6 100644
--- a/fs/ocfs2/cluster/heartbeat.c
+++ b/fs/ocfs2/cluster/heartbeat.c
@@ -1447,6 +1447,15 @@ out:
         return ret;
 }
 
+static ssize_t o2hb_region_pid_read(struct o2hb_region *reg,
+                                      char *page)
+{
+        if (!reg->hr_task)
+                return 0;
+
+        return sprintf(page, "%u\n", reg->hr_task->pid);
+}
+
 struct o2hb_region_attribute {
         struct configfs_attribute attr;
         ssize_t (*show)(struct o2hb_region *, char *);
@@ -1485,11 +1494,19 @@ static struct o2hb_region_attribute o2hb_region_attr_dev = {
         .store  = o2hb_region_dev_write,
 };
 
+static struct o2hb_region_attribute o2hb_region_attr_pid = {
+       .attr   = { .ca_owner = THIS_MODULE,
+                   .ca_name = "pid",
+                   .ca_mode = S_IRUGO | S_IRUSR },
+       .show   = o2hb_region_pid_read,
+};
+
 static struct configfs_attribute *o2hb_region_attrs[] = {
         &o2hb_region_attr_block_bytes.attr,
         &o2hb_region_attr_start_block.attr,
         &o2hb_region_attr_blocks.attr,
         &o2hb_region_attr_dev.attr,
+        &o2hb_region_attr_pid.attr,
         NULL,
 };
 
diff --git a/fs/ocfs2/dlmglue.c b/fs/ocfs2/dlmglue.c
index e6220137bf69..e335541727f9 100644
--- a/fs/ocfs2/dlmglue.c
+++ b/fs/ocfs2/dlmglue.c
@@ -2718,6 +2718,15 @@ static int ocfs2_data_convert_worker(struct ocfs2_lock_res *lockres,
         inode = ocfs2_lock_res_inode(lockres);
         mapping = inode->i_mapping;
 
+        /*
+         * We need this before the filemap_fdatawrite() so that it can
+         * transfer the dirty bit from the PTE to the
+         * page. Unfortunately this means that even for EX->PR
+         * downconverts, we'll lose our mappings and have to build
+         * them up again.
+         */
+        unmap_mapping_range(mapping, 0, 0, 0);
+
         if (filemap_fdatawrite(mapping)) {
                 mlog(ML_ERROR, "Could not sync inode %llu for downconvert!",
                      (unsigned long long)OCFS2_I(inode)->ip_blkno);
@@ -2725,7 +2734,6 @@ static int ocfs2_data_convert_worker(struct ocfs2_lock_res *lockres,
         sync_mapping_buffers(mapping);
         if (blocking == LKM_EXMODE) {
                 truncate_inode_pages(mapping, 0);
-                unmap_mapping_range(mapping, 0, 0, 0);
         } else {
                 /* We only need to wait on the I/O if we're not also
                  * truncating pages because truncate_inode_pages waits
diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c
index 9fd590b9bde3..10953a508f2f 100644
--- a/fs/ocfs2/file.c
+++ b/fs/ocfs2/file.c
@@ -149,6 +149,17 @@ int ocfs2_should_update_atime(struct inode *inode,
             ((inode->i_sb->s_flags & MS_NODIRATIME) && S_ISDIR(inode->i_mode)))
                 return 0;
 
+        /*
+         * We can be called with no vfsmnt structure - NFSD will
+         * sometimes do this.
+         *
+         * Note that our action here is different than touch_atime() -
+         * if we can't tell whether this is a noatime mount, then we
+         * don't know whether to trust the value of s_atime_quantum.
+         */
+        if (vfsmnt == NULL)
+                return 0;
+
         if ((vfsmnt->mnt_flags & MNT_NOATIME) ||
             ((vfsmnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
                 return 0;
@@ -966,8 +977,6 @@ int ocfs2_permission(struct inode *inode, int mask, struct nameidata *nd)
         }
 
         ret = generic_permission(inode, mask, NULL);
-        if (ret)
-                mlog_errno(ret);
 
         ocfs2_meta_unlock(inode, 0);
 out: