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Combined superblock scan and fetch of xored-globals during mount

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Conceptually these are two separate operations. However, they are both
only needed during mount, both require iteration over the linked-list of
metadata-pairs, and both are independent from each other.

Combining these into one gives us a nice code savings.

Additionally, this greatly simplifies the lookup of the root directory.
Initially we used a flag to indicate which superblock was root, since we
didn't want to fetch more pairs than we needed to. But since we're going
to fetch all metadata-pairs anyways, we can just use the last superblock
we find as the indicator of our root directory.
This commit is contained in:
Christopher Haster
2018-09-12 01:50:21 -05:00
parent 7bacf9b1e0
commit cf87ba5375
3 changed files with 80 additions and 86 deletions
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8
lfs.h
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@@ -94,27 +94,25 @@ enum lfs_type {
// internally used types
LFS_TYPE_USER = 0x100,
LFS_TYPE_SUPERBLOCK = 0x001,
LFS_TYPE_ROOT = 0x000,
LFS_TYPE_NAME = 0x000,
LFS_TYPE_DELETE = 0x020,
LFS_TYPE_STRUCT = 0x040,
LFS_TYPE_GLOBALS = 0x0e0,
LFS_TYPE_TAIL = 0x080,
LFS_TYPE_SOFTTAIL = 0x080,
LFS_TYPE_HARDTAIL = 0x081,
LFS_TYPE_CRC = 0x0a0,
LFS_TYPE_SUPERBLOCK = 0x001,
LFS_TYPE_GLOBALS = 0x0e0,
LFS_TYPE_DIRSTRUCT = 0x040,
LFS_TYPE_INLINESTRUCT = 0x041,
LFS_TYPE_CTZSTRUCT = 0x042,
// internal chip sources
LFS_FROM_REGION = 0x000,
LFS_FROM_MEM = 0x000,
LFS_FROM_DISK = 0x200,
LFS_FROM_MOVE = 0x0c1,
LFS_FROM_USERATTRS = 0x0c2,
LFS_FROM_SUPERBLOCK = 0x0c3,
};
// File open flags