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authorJin Qian <jinqian@google.com>2017-04-25 16:28:48 -0700
committerJaegeuk Kim <jaegeuk@kernel.org>2017-05-02 21:19:48 -0700
commitb9dd46188edc2f0d1f37328637860bb65a771124 (patch)
tree9476c2adfe493a9b3f91f3e8363a3e269b21cde6 /include/linux/f2fs_fs.h
parenta817737e87d506ea7b3983d287b4578c99922d85 (diff)
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f2fs: sanity check segment count
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 <jinqian@google.com> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Diffstat (limited to 'include/linux/f2fs_fs.h')
-rw-r--r--include/linux/f2fs_fs.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/f2fs_fs.h b/include/linux/f2fs_fs.h
index 639cbdf65e2b..093549e10ee2 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