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-rw-r--r--fs/ocfs2/export.c84
1 files changed, 77 insertions, 7 deletions
diff --git a/fs/ocfs2/export.c b/fs/ocfs2/export.c
index 2f27b332d8b3..de3da8eb558c 100644
--- a/fs/ocfs2/export.c
+++ b/fs/ocfs2/export.c
@@ -31,6 +31,7 @@
#include "ocfs2.h"
+#include "alloc.h"
#include "dir.h"
#include "dlmglue.h"
#include "dcache.h"
@@ -38,6 +39,7 @@
#include "inode.h"
#include "buffer_head_io.h"
+#include "suballoc.h"
struct ocfs2_inode_handle
{
@@ -49,29 +51,97 @@ static struct dentry *ocfs2_get_dentry(struct super_block *sb,
struct ocfs2_inode_handle *handle)
{
struct inode *inode;
+ struct ocfs2_super *osb = OCFS2_SB(sb);
+ u64 blkno = handle->ih_blkno;
+ int status, set;
struct dentry *result;
mlog_entry("(0x%p, 0x%p)\n", sb, handle);
- if (handle->ih_blkno == 0) {
- mlog_errno(-ESTALE);
- return ERR_PTR(-ESTALE);
+ if (blkno == 0) {
+ mlog(0, "nfs wants inode with blkno: 0\n");
+ result = ERR_PTR(-ESTALE);
+ goto bail;
+ }
+
+ inode = ocfs2_ilookup(sb, blkno);
+ /*
+ * If the inode exists in memory, we only need to check it's
+ * generation number
+ */
+ if (inode)
+ goto check_gen;
+
+ /*
+ * This will synchronize us against ocfs2_delete_inode() on
+ * all nodes
+ */
+ status = ocfs2_nfs_sync_lock(osb, 1);
+ if (status < 0) {
+ mlog(ML_ERROR, "getting nfs sync lock(EX) failed %d\n", status);
+ goto check_err;
+ }
+
+ status = ocfs2_test_inode_bit(osb, blkno, &set);
+ if (status < 0) {
+ if (status == -EINVAL) {
+ /*
+ * The blkno NFS gave us doesn't even show up
+ * as an inode, we return -ESTALE to be
+ * nice
+ */
+ mlog(0, "test inode bit failed %d\n", status);
+ status = -ESTALE;
+ } else {
+ mlog(ML_ERROR, "test inode bit failed %d\n", status);
+ }
+ goto unlock_nfs_sync;
+ }
+
+ /* If the inode allocator bit is clear, this inode must be stale */
+ if (!set) {
+ mlog(0, "inode %llu suballoc bit is clear\n", blkno);
+ status = -ESTALE;
+ goto unlock_nfs_sync;
}
- inode = ocfs2_iget(OCFS2_SB(sb), handle->ih_blkno, 0, 0);
+ inode = ocfs2_iget(osb, blkno, 0, 0);
- if (IS_ERR(inode))
- return (void *)inode;
+unlock_nfs_sync:
+ ocfs2_nfs_sync_unlock(osb, 1);
+check_err:
+ if (status < 0) {
+ if (status == -ESTALE) {
+ mlog(0, "stale inode ino: %llu generation: %u\n",
+ blkno, handle->ih_generation);
+ }
+ result = ERR_PTR(status);
+ goto bail;
+ }
+
+ if (IS_ERR(inode)) {
+ mlog_errno(PTR_ERR(inode));
+ result = (void *)inode;
+ goto bail;
+ }
+
+check_gen:
if (handle->ih_generation != inode->i_generation) {
iput(inode);
- return ERR_PTR(-ESTALE);
+ mlog(0, "stale inode ino: %llu generation: %u\n", blkno,
+ handle->ih_generation);
+ result = ERR_PTR(-ESTALE);
+ goto bail;
}
result = d_obtain_alias(inode);
if (!IS_ERR(result))
result->d_op = &ocfs2_dentry_ops;
+ else
+ mlog_errno(PTR_ERR(result));
+bail:
mlog_exit_ptr(result);
return result;
}