Modifications to reserve space for encrypted filesystem support

Original patch by Motorola modified for lollipop

Change-Id: Ie77467a11c6b50d51c67d63644677caec7959031

1 files changed, 37 insertions, 1 deletions

diff --git a/lib/libf2fs.c b/lib/libf2fs.c
index 9e19e9b..a7021ad 100644
--- a/lib/libf2fs.c
+++ b/lib/libf2fs.c
@@ -362,6 +362,7 @@ void f2fs_init_configuration(struct f2fs_configuration *c)
 	c->vol_label = "";
 	c->device_name = NULL;
 	c->trim = 1;
+	c->bytes_reserved = 0;
 }
 
 static int is_mounted(const char *mpt, const char *device)
@@ -457,7 +458,20 @@ int f2fs_get_device_info(struct f2fs_configuration *c)
 	}
 
 	if (S_ISREG(stat_buf.st_mode)) {
-		c->total_sectors = stat_buf.st_size / c->sector_size;
+		if (c->bytes_reserved >= stat_buf.st_size) {
+			MSG(0, "\n\Error: reserved bytes (%u) is bigger than the device size (%u bytes)\n",
+			    (unsigned int) c->bytes_reserved,
+			    (unsigned int) stat_buf.st_size);
+			return -1;
+		}
+
+		c->total_sectors = (stat_buf.st_size - c->bytes_reserved) / c->sector_size;
+
+                if (c->bytes_reserved) {
+                        MSG(0, "Info: Reserved %u bytes ", (unsigned int) c->bytes_reserved);
+                        MSG(0, "from device of size %u sectors\n",
+			    (unsigned int) (stat_buf.st_size / c->sector_size));
+                }
 	} else if (S_ISBLK(stat_buf.st_mode)) {
 		if (ioctl(fd, BLKSSZGET, &sector_size) < 0) {
 			MSG(0, "\tError: Using the default sector size\n");
@@ -482,6 +496,28 @@ int f2fs_get_device_info(struct f2fs_configuration *c)
 		total_sectors /= c->sector_size;
 		c->total_sectors = total_sectors;
 #endif
+
+		if (c->bytes_reserved) {
+			unsigned int reserved_sectors;
+
+			reserved_sectors = c->bytes_reserved / c->sector_size;
+			if (c->bytes_reserved % c->sector_size) {reserved_sectors++;}
+
+			if(reserved_sectors >= c->total_sectors) {
+				MSG(0, "\n\Error: reserved bytes (%u sectors) is bigger than the device size (%u sectors)\n",
+				    (unsigned int) reserved_sectors,
+				    (unsigned int) c->total_sectors);
+				return -1;
+			}
+
+			MSG(0, "\n");
+			MSG(0, "Info: Reserved %u sectors ", (unsigned int) reserved_sectors);
+			MSG(0, "from device of size %u sectors\n",
+			    (unsigned int) c->total_sectors);
+
+			c->total_sectors -= reserved_sectors;
+		}
+
 		if (ioctl(fd, HDIO_GETGEO, &geom) < 0)
 			c->start_sector = 0;
 		else