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hpfs: annotate btree nodes, get rid of bitfields mess

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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro
2012-04-17 15:59:35 -04:00
parent 39413c6046
commit ddc19e6e04
3 changed files with 52 additions and 51 deletions
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60
fs/hpfs/hpfs.h
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@@ -375,50 +375,36 @@ struct hpfs_dirent {
struct bplus_leaf_node
{
u32 file_secno; /* first file sector in extent */
u32 length; /* length, sectors */
secno disk_secno; /* first corresponding disk sector */
__le32 file_secno; /* first file sector in extent */
__le32 length; /* length, sectors */
__le32 disk_secno; /* first corresponding disk sector */
};
struct bplus_internal_node
{
u32 file_secno; /* subtree maps sectors < this */
anode_secno down; /* pointer to subtree */
__le32 file_secno; /* subtree maps sectors < this */
__le32 down; /* pointer to subtree */
};
enum {
BP_hbff = 1,
BP_fnode_parent = 0x20,
BP_binary_search = 0x40,
BP_internal = 0x80
};
struct bplus_header
{
#ifdef __LITTLE_ENDIAN
u8 hbff: 1; /* high bit of first free entry offset */
u8 flag1234: 4;
u8 fnode_parent: 1; /* ? we're pointed to by an fnode,
u8 flags; /* bit 0 - high bit of first free entry offset
bit 5 - we're pointed to by an fnode,
the data btree or some ea or the
main ea bootage pointer ea_secno */
/* also can get set in fnodes, which
may be a chkdsk glitch or may mean
this bit is irrelevant in fnodes,
or this interpretation is all wet */
u8 binary_search: 1; /* suggest binary search (unused) */
u8 internal: 1; /* 1 -> (internal) tree of anodes
0 -> (leaf) list of extents */
#else
u8 internal: 1; /* 1 -> (internal) tree of anodes
0 -> (leaf) list of extents */
u8 binary_search: 1; /* suggest binary search (unused) */
u8 fnode_parent: 1; /* ? we're pointed to by an fnode,
the data btree or some ea or the
main ea bootage pointer ea_secno */
/* also can get set in fnodes, which
may be a chkdsk glitch or may mean
this bit is irrelevant in fnodes,
or this interpretation is all wet */
u8 flag1234: 4;
u8 hbff: 1; /* high bit of first free entry offset */
#endif
main ea bootage pointer ea_secno
bit 6 - suggest binary search (unused)
bit 7 - 1 -> (internal) tree of anodes
0 -> (leaf) list of extents */
u8 fill[3];
u8 n_free_nodes; /* free nodes in following array */
u8 n_used_nodes; /* used nodes in following array */
u16 first_free; /* offset from start of header to
__le16 first_free; /* offset from start of header to
first free node in array */
union {
struct bplus_internal_node internal[0]; /* (internal) 2-word entries giving
@@ -428,6 +414,16 @@ struct bplus_header
} u;
};
static inline bool bp_internal(struct bplus_header *bp)
{
return bp->flags & BP_internal;
}
static inline bool bp_fnode_parent(struct bplus_header *bp)
{
return bp->flags & BP_fnode_parent;
}
/* fnode: root of allocation b+ tree, and EA's */
/* Every file and every directory has one fnode, pointed to by the directory