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xfs: vectorise encoding/decoding directory headers

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Conversion from on-disk structures to in-core header structures
currently relies on magic number checks. If the magic number is
wrong, but one of the supported values, we do the wrong thing with
the encode/decode operation. Split these functions so that there are
discrete operations for the specific directory format we are
handling.

In doing this, move all the header encode/decode functions to
xfs_da_format.c as they are directly manipulating the on-disk
format. It should be noted that all the growth in binary size is
from xfs_da_format.c - the rest of the code actaully shrinks.

   text    data     bss     dec     hex filename
 794490   96802    1096  892388   d9de4 fs/xfs/xfs.o.orig
 792986   96802    1096  890884   d9804 fs/xfs/xfs.o.p1
 792350   96802    1096  890248   d9588 fs/xfs/xfs.o.p2
 789293   96802    1096  887191   d8997 fs/xfs/xfs.o.p3
 789005   96802    1096  886903   d8997 fs/xfs/xfs.o.p4
 789061   96802    1096  886959   d88af fs/xfs/xfs.o.p5
 789733   96802    1096  887631   d8b4f fs/xfs/xfs.o.p6
 791421   96802    1096  889319   d91e7 fs/xfs/xfs.o.p7

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Ben Myers <bpm@sgi.com>
Signed-off-by: Ben Myers <bpm@sgi.com>
This commit is contained in:
Dave Chinner
2013-10-29 22:11:52 +11:00
committed by Ben Myers
parent 4bceb18f15
commit 01ba43b873
11 changed files with 338 additions and 281 deletions
Download Patch File Download Diff File Expand all files Collapse all files

209
fs/xfs/xfs_da_format.c
View File

@@ -464,19 +464,84 @@ xfs_dir3_leaf_hdr_size(void)
return sizeof(struct xfs_dir3_leaf_hdr);
}
static inline int
static int
xfs_dir3_max_leaf_ents(struct xfs_mount *mp)
{
return (mp->m_dirblksize - xfs_dir3_leaf_hdr_size()) /
(uint)sizeof(struct xfs_dir2_leaf_entry);
}
static inline struct xfs_dir2_leaf_entry *
static struct xfs_dir2_leaf_entry *
xfs_dir3_leaf_ents_p(struct xfs_dir2_leaf *lp)
{
return ((struct xfs_dir3_leaf *)lp)->__ents;
}
static void
xfs_dir2_leaf_hdr_from_disk(
struct xfs_dir3_icleaf_hdr *to,
struct xfs_dir2_leaf *from)
{
to->forw = be32_to_cpu(from->hdr.info.forw);
to->back = be32_to_cpu(from->hdr.info.back);
to->magic = be16_to_cpu(from->hdr.info.magic);
to->count = be16_to_cpu(from->hdr.count);
to->stale = be16_to_cpu(from->hdr.stale);
ASSERT(to->magic == XFS_DIR2_LEAF1_MAGIC ||
to->magic == XFS_DIR2_LEAFN_MAGIC);
}
static void
xfs_dir2_leaf_hdr_to_disk(
struct xfs_dir2_leaf *to,
struct xfs_dir3_icleaf_hdr *from)
{
ASSERT(from->magic == XFS_DIR2_LEAF1_MAGIC ||
from->magic == XFS_DIR2_LEAFN_MAGIC);
to->hdr.info.forw = cpu_to_be32(from->forw);
to->hdr.info.back = cpu_to_be32(from->back);
to->hdr.info.magic = cpu_to_be16(from->magic);
to->hdr.count = cpu_to_be16(from->count);
to->hdr.stale = cpu_to_be16(from->stale);
}
static void
xfs_dir3_leaf_hdr_from_disk(
struct xfs_dir3_icleaf_hdr *to,
struct xfs_dir2_leaf *from)
{
struct xfs_dir3_leaf_hdr *hdr3 = (struct xfs_dir3_leaf_hdr *)from;
to->forw = be32_to_cpu(hdr3->info.hdr.forw);
to->back = be32_to_cpu(hdr3->info.hdr.back);
to->magic = be16_to_cpu(hdr3->info.hdr.magic);
to->count = be16_to_cpu(hdr3->count);
to->stale = be16_to_cpu(hdr3->stale);
ASSERT(to->magic == XFS_DIR3_LEAF1_MAGIC ||
to->magic == XFS_DIR3_LEAFN_MAGIC);
}
static void
xfs_dir3_leaf_hdr_to_disk(
struct xfs_dir2_leaf *to,
struct xfs_dir3_icleaf_hdr *from)
{
struct xfs_dir3_leaf_hdr *hdr3 = (struct xfs_dir3_leaf_hdr *)to;
ASSERT(from->magic == XFS_DIR3_LEAF1_MAGIC ||
from->magic == XFS_DIR3_LEAFN_MAGIC);
hdr3->info.hdr.forw = cpu_to_be32(from->forw);
hdr3->info.hdr.back = cpu_to_be32(from->back);
hdr3->info.hdr.magic = cpu_to_be16(from->magic);
hdr3->count = cpu_to_be16(from->count);
hdr3->stale = cpu_to_be16(from->stale);
}
/*
* Directory/Attribute Node block operations
*/
@@ -504,6 +569,121 @@ xfs_da3_node_tree_p(struct xfs_da_intnode *dap)
return ((struct xfs_da3_intnode *)dap)->__btree;
}
static void
xfs_da2_node_hdr_from_disk(
struct xfs_da3_icnode_hdr *to,
struct xfs_da_intnode *from)
{
ASSERT(from->hdr.info.magic == cpu_to_be16(XFS_DA_NODE_MAGIC));
to->forw = be32_to_cpu(from->hdr.info.forw);
to->back = be32_to_cpu(from->hdr.info.back);
to->magic = be16_to_cpu(from->hdr.info.magic);
to->count = be16_to_cpu(from->hdr.__count);
to->level = be16_to_cpu(from->hdr.__level);
}
static void
xfs_da2_node_hdr_to_disk(
struct xfs_da_intnode *to,
struct xfs_da3_icnode_hdr *from)
{
ASSERT(from->magic == XFS_DA_NODE_MAGIC);
to->hdr.info.forw = cpu_to_be32(from->forw);
to->hdr.info.back = cpu_to_be32(from->back);
to->hdr.info.magic = cpu_to_be16(from->magic);
to->hdr.__count = cpu_to_be16(from->count);
to->hdr.__level = cpu_to_be16(from->level);
}
static void
xfs_da3_node_hdr_from_disk(
struct xfs_da3_icnode_hdr *to,
struct xfs_da_intnode *from)
{
struct xfs_da3_node_hdr *hdr3 = (struct xfs_da3_node_hdr *)from;
ASSERT(from->hdr.info.magic == cpu_to_be16(XFS_DA3_NODE_MAGIC));
to->forw = be32_to_cpu(hdr3->info.hdr.forw);
to->back = be32_to_cpu(hdr3->info.hdr.back);
to->magic = be16_to_cpu(hdr3->info.hdr.magic);
to->count = be16_to_cpu(hdr3->__count);
to->level = be16_to_cpu(hdr3->__level);
}
static void
xfs_da3_node_hdr_to_disk(
struct xfs_da_intnode *to,
struct xfs_da3_icnode_hdr *from)
{
struct xfs_da3_node_hdr *hdr3 = (struct xfs_da3_node_hdr *)to;
ASSERT(from->magic == XFS_DA3_NODE_MAGIC);
hdr3->info.hdr.forw = cpu_to_be32(from->forw);
hdr3->info.hdr.back = cpu_to_be32(from->back);
hdr3->info.hdr.magic = cpu_to_be16(from->magic);
hdr3->__count = cpu_to_be16(from->count);
hdr3->__level = cpu_to_be16(from->level);
}
/*
* Directory free space block operations
*/
static void
xfs_dir2_free_hdr_from_disk(
struct xfs_dir3_icfree_hdr *to,
struct xfs_dir2_free *from)
{
to->magic = be32_to_cpu(from->hdr.magic);
to->firstdb = be32_to_cpu(from->hdr.firstdb);
to->nvalid = be32_to_cpu(from->hdr.nvalid);
to->nused = be32_to_cpu(from->hdr.nused);
ASSERT(to->magic == XFS_DIR2_FREE_MAGIC);
}
static void
xfs_dir2_free_hdr_to_disk(
struct xfs_dir2_free *to,
struct xfs_dir3_icfree_hdr *from)
{
ASSERT(from->magic == XFS_DIR2_FREE_MAGIC);
to->hdr.magic = cpu_to_be32(from->magic);
to->hdr.firstdb = cpu_to_be32(from->firstdb);
to->hdr.nvalid = cpu_to_be32(from->nvalid);
to->hdr.nused = cpu_to_be32(from->nused);
}
static void
xfs_dir3_free_hdr_from_disk(
struct xfs_dir3_icfree_hdr *to,
struct xfs_dir2_free *from)
{
struct xfs_dir3_free_hdr *hdr3 = (struct xfs_dir3_free_hdr *)from;
to->magic = be32_to_cpu(hdr3->hdr.magic);
to->firstdb = be32_to_cpu(hdr3->firstdb);
to->nvalid = be32_to_cpu(hdr3->nvalid);
to->nused = be32_to_cpu(hdr3->nused);
ASSERT(to->magic == XFS_DIR3_FREE_MAGIC);
}
static void
xfs_dir3_free_hdr_to_disk(
struct xfs_dir2_free *to,
struct xfs_dir3_icfree_hdr *from)
{
struct xfs_dir3_free_hdr *hdr3 = (struct xfs_dir3_free_hdr *)to;
ASSERT(from->magic == XFS_DIR3_FREE_MAGIC);
hdr3->hdr.magic = cpu_to_be32(from->magic);
hdr3->firstdb = cpu_to_be32(from->firstdb);
hdr3->nvalid = cpu_to_be32(from->nvalid);
hdr3->nused = cpu_to_be32(from->nused);
}
const struct xfs_dir_ops xfs_dir2_ops = {
.sf_entsize = xfs_dir2_sf_entsize,
.sf_nextentry = xfs_dir2_sf_nextentry,
@@ -532,11 +712,18 @@ const struct xfs_dir_ops xfs_dir2_ops = {
.data_unused_p = xfs_dir2_data_unused_p,
.leaf_hdr_size = xfs_dir2_leaf_hdr_size,
.leaf_hdr_to_disk = xfs_dir2_leaf_hdr_to_disk,
.leaf_hdr_from_disk = xfs_dir2_leaf_hdr_from_disk,
.leaf_max_ents = xfs_dir2_max_leaf_ents,
.leaf_ents_p = xfs_dir2_leaf_ents_p,
.node_hdr_size = xfs_da2_node_hdr_size,
.node_hdr_to_disk = xfs_da2_node_hdr_to_disk,
.node_hdr_from_disk = xfs_da2_node_hdr_from_disk,
.node_tree_p = xfs_da2_node_tree_p,
.free_hdr_to_disk = xfs_dir2_free_hdr_to_disk,
.free_hdr_from_disk = xfs_dir2_free_hdr_from_disk,
};
const struct xfs_dir_ops xfs_dir2_ftype_ops = {
@@ -567,11 +754,18 @@ const struct xfs_dir_ops xfs_dir2_ftype_ops = {
.data_unused_p = xfs_dir2_data_unused_p,
.leaf_hdr_size = xfs_dir2_leaf_hdr_size,
.leaf_hdr_to_disk = xfs_dir2_leaf_hdr_to_disk,
.leaf_hdr_from_disk = xfs_dir2_leaf_hdr_from_disk,
.leaf_max_ents = xfs_dir2_max_leaf_ents,
.leaf_ents_p = xfs_dir2_leaf_ents_p,
.node_hdr_size = xfs_da2_node_hdr_size,
.node_hdr_to_disk = xfs_da2_node_hdr_to_disk,
.node_hdr_from_disk = xfs_da2_node_hdr_from_disk,
.node_tree_p = xfs_da2_node_tree_p,
.free_hdr_to_disk = xfs_dir2_free_hdr_to_disk,
.free_hdr_from_disk = xfs_dir2_free_hdr_from_disk,
};
const struct xfs_dir_ops xfs_dir3_ops = {
@@ -602,20 +796,31 @@ const struct xfs_dir_ops xfs_dir3_ops = {
.data_unused_p = xfs_dir3_data_unused_p,
.leaf_hdr_size = xfs_dir3_leaf_hdr_size,
.leaf_hdr_to_disk = xfs_dir3_leaf_hdr_to_disk,
.leaf_hdr_from_disk = xfs_dir3_leaf_hdr_from_disk,
.leaf_max_ents = xfs_dir3_max_leaf_ents,
.leaf_ents_p = xfs_dir3_leaf_ents_p,
.node_hdr_size = xfs_da3_node_hdr_size,
.node_hdr_to_disk = xfs_da3_node_hdr_to_disk,
.node_hdr_from_disk = xfs_da3_node_hdr_from_disk,
.node_tree_p = xfs_da3_node_tree_p,
.free_hdr_to_disk = xfs_dir3_free_hdr_to_disk,
.free_hdr_from_disk = xfs_dir3_free_hdr_from_disk,
};
const struct xfs_dir_ops xfs_dir2_nondir_ops = {
.node_hdr_size = xfs_da2_node_hdr_size,
.node_hdr_to_disk = xfs_da2_node_hdr_to_disk,
.node_hdr_from_disk = xfs_da2_node_hdr_from_disk,
.node_tree_p = xfs_da2_node_tree_p,
};
const struct xfs_dir_ops xfs_dir3_nondir_ops = {
.node_hdr_size = xfs_da3_node_hdr_size,
.node_hdr_to_disk = xfs_da3_node_hdr_to_disk,
.node_hdr_from_disk = xfs_da3_node_hdr_from_disk,
.node_tree_p = xfs_da3_node_tree_p,
};