From: Jin Qian <jinq...@google.com>
F2FS uses 4 bytes to represent block address. As a result, supported
size of disk is 16 TB and it equals to 16 * 1024 * 1024 / 2 segments.
Signed-off-by: Jin Qian <jinq...@google.com>
---
fs/f2fs/super.c | 7 +++++++
include/linux/f2fs_fs.h | 6 ++++++
2 files changed, 13 insertions(+)
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 97c07a5153e9..4cd3bee6775f 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -1494,6 +1494,13 @@ static int sanity_check_raw_super(struct f2fs_sb_info
*sbi,
return 1;
}
+ if (le32_to_cpu(raw_super->segment_count) > F2FS_MAX_SEGMENT) {
+ f2fs_msg(sb, KERN_INFO,
+ "Invalid segment count (%u)",
+ le32_to_cpu(raw_super->segment_count));
+ return 1;
+ }
+
/* check CP/SIT/NAT/SSA/MAIN_AREA area boundary */
if (sanity_check_area_boundary(sbi, bh))
return 1;
diff --git a/include/linux/f2fs_fs.h b/include/linux/f2fs_fs.h
index e2d239ed4c60..661200e6d281 100644
--- a/include/linux/f2fs_fs.h
+++ b/include/linux/f2fs_fs.h
@@ -302,6 +302,12 @@ struct f2fs_nat_block {
#define SIT_ENTRY_PER_BLOCK (PAGE_SIZE / sizeof(struct f2fs_sit_entry))
/*
+ * F2FS uses 4 bytes to represent block address. As a result, supported size of
+ * disk is 16 TB and it equals to 16 * 1024 * 1024 / 2 segments.
+ */
+#define F2FS_MAX_SEGMENT ((16 * 1024 * 1024) / 2)
+
+/*
* Note that f2fs_sit_entry->vblocks has the following bit-field information.
* [15:10] : allocation type such as CURSEG_XXXX_TYPE
* [9:0] : valid block count
--
2.13.0.rc0.306.g87b477812d-goog
------------------------------------------------------------------------------
Check out the vibrant tech community on one of the world's most
engaging tech sites, Slashdot.org! http://sdm.link/slashdot
_______________________________________________
Linux-f2fs-devel mailing list
Linux-f2fs-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel
