[XFS] Remove the 128K limitation on pagebuf_get_no_daddr() and allow

the kmem_alloc() to fail.

SGI Modid: xfs-linux:xfs-kern:171201a

fs/xfs/linux/kmem.h

@@ -52,6 +52,7 @@
 #define KM_SLEEP	0x0001
 #define KM_NOSLEEP	0x0002
 #define KM_NOFS		0x0004
+#define KM_MAYFAIL	0x0005
 
 typedef unsigned long xfs_pflags_t;
 
@@ -78,28 +79,31 @@ typedef unsigned long xfs_pflags_t;
 	*(NSTATEP) = *(OSTATEP);	\
 } while (0)
 
-/*
- * XXX get rid of the unconditional  __GFP_NOFAIL by adding
- * a KM_FAIL flag and using it where we're allowed to fail.
- */
 static __inline unsigned int
 kmem_flags_convert(int flags)
 {
 	int lflags;
 
 #if DEBUG
-	if (unlikely(flags & ~(KM_SLEEP|KM_NOSLEEP|KM_NOFS))) {
+	if (unlikely(flags & ~(KM_SLEEP|KM_NOSLEEP|KM_NOFS|KM_MAYFAIL))) {
 		printk(KERN_WARNING
 		    "XFS: memory allocation with wrong flags (%x)\n", flags);
 		BUG();
 	}
 #endif
 
-	lflags = (flags & KM_NOSLEEP) ? GFP_ATOMIC : (GFP_KERNEL|__GFP_NOFAIL);
+	if (flags & KM_NOSLEEP) {
+		lflags = GFP_ATOMIC;
+	} else {
+		lflags = GFP_KERNEL;
 
-	/* avoid recusive callbacks to filesystem during transactions */
-	if (PFLAGS_TEST_FSTRANS() || (flags & KM_NOFS))
-		lflags &= ~__GFP_FS;
+		/* avoid recusive callbacks to filesystem during transactions */
+		if (PFLAGS_TEST_FSTRANS() || (flags & KM_NOFS))
+			lflags &= ~__GFP_FS;
+
+		if (!(flags & KM_MAYFAIL))
+			lflags |= __GFP_NOFAIL;
+	}
 
 	return lflags;
 }

fs/xfs/linux/xfs_buf.c

@@ -812,16 +812,13 @@ pagebuf_get_no_daddr(
 	void			*data;
 	int			error;
 
-	if (unlikely(len > 0x20000))
-		goto fail;
-
 	bp = pagebuf_allocate(0);
 	if (unlikely(bp == NULL))
 		goto fail;
 	_pagebuf_initialize(bp, target, 0, len, PBF_FORCEIO);
 
  try_again:
-	data = kmem_alloc(malloc_len, KM_SLEEP);
+	data = kmem_alloc(malloc_len, KM_SLEEP | KM_MAYFAIL);
 	if (unlikely(data == NULL))
 		goto fail_free_buf;
 

fs/xfs/xfs_log.c

@@ -497,7 +497,7 @@ xfs_log_mount(xfs_mount_t	*mp,
 		if (readonly)
 			vfsp->vfs_flag |= VFS_RDONLY;
 		if (error) {
-			cmn_err(CE_WARN, "XFS: log mount/recovery failed");
+			cmn_err(CE_WARN, "XFS: log mount/recovery failed: error %d", error);
 			xlog_unalloc_log(mp->m_log);
 			return error;
 		}