[PATCH v4 3/7] mm/vmalloc.c: allow vread() to read out vm_map_ram areas

[Baoquan He <bhe@redhat.com>]

Currently, vread can read out vmalloc areas which is associated with
a vm_struct. While this doesn't work for areas created by vm_map_ram()
interface because it doesn't have an associated vm_struct. Then in vread(),
these areas are all skipped.

Here, add a new function vmap_ram_vread() to read out vm_map_ram areas.
The area created with vmap_ram_vread() interface directly can be handled
like the other normal vmap areas with aligned_vread(). While areas
which will be further subdivided and managed with vmap_block need
carefully read out page-aligned small regions and zero fill holes.

Signed-off-by: Baoquan He <bhe@redhat.com>
---
 mm/vmalloc.c | 87 +++++++++++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 80 insertions(+), 7 deletions(-)

diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index ab4825050b5c..5a3ea6cb7ec2 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -3544,6 +3544,67 @@ static int aligned_vread(char *buf, char *addr, unsigned long count)
 	return copied;
 }
 
+static void vmap_ram_vread(char *buf, char *addr, int count, unsigned long flags)
+{
+	char *start;
+	struct vmap_block *vb;
+	unsigned long offset;
+	unsigned int rs, re, n;
+
+	/*
+	 * If it's area created by vm_map_ram() interface directly, but
+	 * not further subdividing and delegating management to vmap_block,
+	 * handle it here.
+	 */
+	if (!(flags & VMAP_BLOCK)) {
+		aligned_vread(buf, addr, count);
+		return;
+	}
+
+	/*
+	 * Area is split into regions and tracked with vmap_block, read out
+	 * each region and zero fill the hole between regions.
+	 */
+	vb = xa_load(&vmap_blocks, addr_to_vb_idx((unsigned long)addr));
+	if (!vb)
+		goto finished;
+
+	spin_lock(&vb->lock);
+	if (bitmap_empty(vb->used_map, VMAP_BBMAP_BITS)) {
+		spin_unlock(&vb->lock);
+		goto finished;
+	}
+	for_each_set_bitrange(rs, re, vb->used_map, VMAP_BBMAP_BITS) {
+		if (!count)
+			break;
+		start = vmap_block_vaddr(vb->va->va_start, rs);
+		while (addr < start) {
+			if (count == 0)
+				break;
+			*buf = '\0';
+			buf++;
+			addr++;
+			count--;
+		}
+		/*it could start reading from the middle of used region*/
+		offset = offset_in_page(addr);
+		n = ((re - rs + 1) << PAGE_SHIFT) - offset;
+		if (n > count)
+			n = count;
+		aligned_vread(buf, start+offset, n);
+
+		buf += n;
+		addr += n;
+		count -= n;
+	}
+	spin_unlock(&vb->lock);
+
+finished:
+	/* zero-fill the left dirty or free regions */
+	if (count)
+		memset(buf, 0, count);
+}
+
 /**
  * vread() - read vmalloc area in a safe way.
  * @buf:     buffer for reading data
@@ -3574,7 +3635,7 @@ long vread(char *buf, char *addr, unsigned long count)
 	struct vm_struct *vm;
 	char *vaddr, *buf_start = buf;
 	unsigned long buflen = count;
-	unsigned long n;
+	unsigned long n, size, flags;
 
 	addr = kasan_reset_tag(addr);
 
@@ -3595,12 +3656,21 @@ long vread(char *buf, char *addr, unsigned long count)
 		if (!count)
 			break;
 
-		if (!va->vm)
+		vm = va->vm;
+		flags = va->flags & VMAP_FLAGS_MASK;
+		/*
+		 * VMAP_BLOCK indicates a sub-type of vm_map_ram area, need
+		 * be set together with VMAP_RAM.
+		 */
+		WARN_ON(flags == VMAP_BLOCK);
+
+		if (!vm && !flags)
 			continue;
 
-		vm = va->vm;
-		vaddr = (char *) vm->addr;
-		if (addr >= vaddr + get_vm_area_size(vm))
+		vaddr = (char *) va->va_start;
+		size = vm ? get_vm_area_size(vm) : va_size(va);
+
+		if (addr >= vaddr + size)
 			continue;
 		while (addr < vaddr) {
 			if (count == 0)
@@ -3610,10 +3680,13 @@ long vread(char *buf, char *addr, unsigned long count)
 			addr++;
 			count--;
 		}
-		n = vaddr + get_vm_area_size(vm) - addr;
+		n = vaddr + size - addr;
 		if (n > count)
 			n = count;
-		if (!(vm->flags & VM_IOREMAP))
+
+		if (flags & VMAP_RAM)
+			vmap_ram_vread(buf, addr, n, flags);
+		else if (!(vm->flags & VM_IOREMAP))
 			aligned_vread(buf, addr, n);
 		else /* IOREMAP area is treated as memory hole */
 			memset(buf, 0, n);
-- 
2.34.1