summaryrefslogtreecommitdiff
path: root/fs/xfs/xfs_da_format.c
diff options
context:
space:
mode:
Diffstat (limited to 'fs/xfs/xfs_da_format.c')
-rw-r--r--fs/xfs/xfs_da_format.c220
1 files changed, 79 insertions, 141 deletions
diff --git a/fs/xfs/xfs_da_format.c b/fs/xfs/xfs_da_format.c
index 01e6f9a9b804..40f18d3b7b9b 100644
--- a/fs/xfs/xfs_da_format.c
+++ b/fs/xfs/xfs_da_format.c
@@ -209,31 +209,41 @@ xfs_dir3_sfe_put_ino(
/*
* Directory data block operations
*/
-static int
-__xfs_dir3_data_entsize(
- bool ftype,
- int n)
-{
- int size = offsetof(struct xfs_dir2_data_entry, name[0]);
- size += n;
- size += sizeof(xfs_dir2_data_off_t);
- if (ftype)
- size += sizeof(__uint8_t);
- return roundup(size, XFS_DIR2_DATA_ALIGN);
-}
+/*
+ * For special situations, the dirent size ends up fixed because we always know
+ * what the size of the entry is. That's true for the "." and "..", and
+ * therefore we know that they are a fixed size and hence their offsets are
+ * constant, as is the first entry.
+ *
+ * Hence, this calculation is written as a macro to be able to be calculated at
+ * compile time and so certain offsets can be calculated directly in the
+ * structure initaliser via the macro. There are two macros - one for dirents
+ * with ftype and without so there are no unresolvable conditionals in the
+ * calculations. We also use round_up() as XFS_DIR2_DATA_ALIGN is always a power
+ * of 2 and the compiler doesn't reject it (unlike roundup()).
+ */
+#define XFS_DIR2_DATA_ENTSIZE(n) \
+ round_up((offsetof(struct xfs_dir2_data_entry, name[0]) + (n) + \
+ sizeof(xfs_dir2_data_off_t)), XFS_DIR2_DATA_ALIGN)
+
+#define XFS_DIR3_DATA_ENTSIZE(n) \
+ round_up((offsetof(struct xfs_dir2_data_entry, name[0]) + (n) + \
+ sizeof(xfs_dir2_data_off_t) + sizeof(__uint8_t)), \
+ XFS_DIR2_DATA_ALIGN)
static int
xfs_dir2_data_entsize(
int n)
{
- return __xfs_dir3_data_entsize(false, n);
+ return XFS_DIR2_DATA_ENTSIZE(n);
}
+
static int
xfs_dir3_data_entsize(
int n)
{
- return __xfs_dir3_data_entsize(true, n);
+ return XFS_DIR3_DATA_ENTSIZE(n);
}
static __uint8_t
@@ -294,45 +304,6 @@ xfs_dir3_data_entry_tag_p(
}
/*
- * Offsets of . and .. in data space (always block 0)
- */
-static xfs_dir2_data_aoff_t
-xfs_dir2_data_dot_offset(void)
-{
- return sizeof(struct xfs_dir2_data_hdr);
-}
-
-static xfs_dir2_data_aoff_t
-xfs_dir2_data_dotdot_offset(void)
-{
- return xfs_dir2_data_dot_offset() + xfs_dir2_data_entsize(1);
-}
-
-static xfs_dir2_data_aoff_t
-xfs_dir2_data_first_offset(void)
-{
- return xfs_dir2_data_dotdot_offset() + xfs_dir2_data_entsize(2);
-}
-
-static xfs_dir2_data_aoff_t
-xfs_dir3_data_dot_offset(void)
-{
- return sizeof(struct xfs_dir3_data_hdr);
-}
-
-static xfs_dir2_data_aoff_t
-xfs_dir3_data_dotdot_offset(void)
-{
- return xfs_dir3_data_dot_offset() + xfs_dir3_data_entsize(1);
-}
-
-static xfs_dir2_data_aoff_t
-xfs_dir3_data_first_offset(void)
-{
- return xfs_dir3_data_dotdot_offset() + xfs_dir3_data_entsize(2);
-}
-
-/*
* location of . and .. in data space (always block 0)
*/
static struct xfs_dir2_data_entry *
@@ -340,7 +311,7 @@ xfs_dir2_data_dot_entry_p(
struct xfs_dir2_data_hdr *hdr)
{
return (struct xfs_dir2_data_entry *)
- ((char *)hdr + xfs_dir2_data_dot_offset());
+ ((char *)hdr + sizeof(struct xfs_dir2_data_hdr));
}
static struct xfs_dir2_data_entry *
@@ -348,7 +319,8 @@ xfs_dir2_data_dotdot_entry_p(
struct xfs_dir2_data_hdr *hdr)
{
return (struct xfs_dir2_data_entry *)
- ((char *)hdr + xfs_dir2_data_dotdot_offset());
+ ((char *)hdr + sizeof(struct xfs_dir2_data_hdr) +
+ XFS_DIR2_DATA_ENTSIZE(1));
}
static struct xfs_dir2_data_entry *
@@ -356,7 +328,9 @@ xfs_dir2_data_first_entry_p(
struct xfs_dir2_data_hdr *hdr)
{
return (struct xfs_dir2_data_entry *)
- ((char *)hdr + xfs_dir2_data_first_offset());
+ ((char *)hdr + sizeof(struct xfs_dir2_data_hdr) +
+ XFS_DIR2_DATA_ENTSIZE(1) +
+ XFS_DIR2_DATA_ENTSIZE(2));
}
static struct xfs_dir2_data_entry *
@@ -364,7 +338,7 @@ xfs_dir3_data_dot_entry_p(
struct xfs_dir2_data_hdr *hdr)
{
return (struct xfs_dir2_data_entry *)
- ((char *)hdr + xfs_dir3_data_dot_offset());
+ ((char *)hdr + sizeof(struct xfs_dir3_data_hdr));
}
static struct xfs_dir2_data_entry *
@@ -372,7 +346,8 @@ xfs_dir3_data_dotdot_entry_p(
struct xfs_dir2_data_hdr *hdr)
{
return (struct xfs_dir2_data_entry *)
- ((char *)hdr + xfs_dir3_data_dotdot_offset());
+ ((char *)hdr + sizeof(struct xfs_dir3_data_hdr) +
+ XFS_DIR3_DATA_ENTSIZE(1));
}
static struct xfs_dir2_data_entry *
@@ -380,7 +355,9 @@ xfs_dir3_data_first_entry_p(
struct xfs_dir2_data_hdr *hdr)
{
return (struct xfs_dir2_data_entry *)
- ((char *)hdr + xfs_dir3_data_first_offset());
+ ((char *)hdr + sizeof(struct xfs_dir3_data_hdr) +
+ XFS_DIR3_DATA_ENTSIZE(1) +
+ XFS_DIR3_DATA_ENTSIZE(2));
}
static struct xfs_dir2_data_free *
@@ -395,44 +372,32 @@ xfs_dir3_data_bestfree_p(struct xfs_dir2_data_hdr *hdr)
return ((struct xfs_dir3_data_hdr *)hdr)->best_free;
}
-static size_t
-xfs_dir2_data_entry_offset(void)
-{
- return sizeof(struct xfs_dir2_data_hdr);
-}
-
static struct xfs_dir2_data_entry *
xfs_dir2_data_entry_p(struct xfs_dir2_data_hdr *hdr)
{
return (struct xfs_dir2_data_entry *)
- ((char *)hdr + xfs_dir2_data_entry_offset());
+ ((char *)hdr + sizeof(struct xfs_dir2_data_hdr));
}
static struct xfs_dir2_data_unused *
xfs_dir2_data_unused_p(struct xfs_dir2_data_hdr *hdr)
{
return (struct xfs_dir2_data_unused *)
- ((char *)hdr + xfs_dir2_data_entry_offset());
-}
-
-static size_t
-xfs_dir3_data_entry_offset(void)
-{
- return sizeof(struct xfs_dir3_data_hdr);
+ ((char *)hdr + sizeof(struct xfs_dir2_data_hdr));
}
static struct xfs_dir2_data_entry *
xfs_dir3_data_entry_p(struct xfs_dir2_data_hdr *hdr)
{
return (struct xfs_dir2_data_entry *)
- ((char *)hdr + xfs_dir3_data_entry_offset());
+ ((char *)hdr + sizeof(struct xfs_dir3_data_hdr));
}
static struct xfs_dir2_data_unused *
xfs_dir3_data_unused_p(struct xfs_dir2_data_hdr *hdr)
{
return (struct xfs_dir2_data_unused *)
- ((char *)hdr + xfs_dir3_data_entry_offset());
+ ((char *)hdr + sizeof(struct xfs_dir3_data_hdr));
}
@@ -440,15 +405,9 @@ xfs_dir3_data_unused_p(struct xfs_dir2_data_hdr *hdr)
* Directory Leaf block operations
*/
static int
-xfs_dir2_leaf_hdr_size(void)
-{
- return sizeof(struct xfs_dir2_leaf_hdr);
-}
-
-static int
xfs_dir2_max_leaf_ents(struct xfs_mount *mp)
{
- return (mp->m_dirblksize - xfs_dir2_leaf_hdr_size()) /
+ return (mp->m_dirblksize - sizeof(struct xfs_dir2_leaf_hdr)) /
(uint)sizeof(struct xfs_dir2_leaf_entry);
}
@@ -459,15 +418,9 @@ xfs_dir2_leaf_ents_p(struct xfs_dir2_leaf *lp)
}
static int
-xfs_dir3_leaf_hdr_size(void)
-{
- return sizeof(struct xfs_dir3_leaf_hdr);
-}
-
-static int
xfs_dir3_max_leaf_ents(struct xfs_mount *mp)
{
- return (mp->m_dirblksize - xfs_dir3_leaf_hdr_size()) /
+ return (mp->m_dirblksize - sizeof(struct xfs_dir3_leaf_hdr)) /
(uint)sizeof(struct xfs_dir2_leaf_entry);
}
@@ -545,25 +498,13 @@ xfs_dir3_leaf_hdr_to_disk(
/*
* Directory/Attribute Node block operations
*/
-static inline int
-xfs_da2_node_hdr_size(void)
-{
- return sizeof(struct xfs_da_node_hdr);
-}
-
static struct xfs_da_node_entry *
xfs_da2_node_tree_p(struct xfs_da_intnode *dap)
{
return dap->__btree;
}
-static inline int
-xfs_da3_node_hdr_size(void)
-{
- return sizeof(struct xfs_da3_node_hdr);
-}
-
-static inline struct xfs_da_node_entry *
+static struct xfs_da_node_entry *
xfs_da3_node_tree_p(struct xfs_da_intnode *dap)
{
return ((struct xfs_da3_intnode *)dap)->__btree;
@@ -630,22 +571,16 @@ xfs_da3_node_hdr_to_disk(
* Directory free space block operations
*/
static int
-xfs_dir2_free_hdr_size(void)
-{
- return sizeof(struct xfs_dir2_free_hdr);
-}
-
-static int
xfs_dir2_free_max_bests(struct xfs_mount *mp)
{
- return (mp->m_dirblksize - xfs_dir2_free_hdr_size()) /
+ return (mp->m_dirblksize - sizeof(struct xfs_dir2_free_hdr)) /
sizeof(xfs_dir2_data_off_t);
}
static __be16 *
xfs_dir2_free_bests_p(struct xfs_dir2_free *free)
{
- return (__be16 *)((char *)free + xfs_dir2_free_hdr_size());
+ return (__be16 *)((char *)free + sizeof(struct xfs_dir2_free_hdr));
}
/*
@@ -667,22 +602,16 @@ xfs_dir2_db_to_fdindex(struct xfs_mount *mp, xfs_dir2_db_t db)
}
static int
-xfs_dir3_free_hdr_size(void)
-{
- return sizeof(struct xfs_dir3_free_hdr);
-}
-
-static int
xfs_dir3_free_max_bests(struct xfs_mount *mp)
{
- return (mp->m_dirblksize - xfs_dir3_free_hdr_size()) /
+ return (mp->m_dirblksize - sizeof(struct xfs_dir3_free_hdr)) /
sizeof(xfs_dir2_data_off_t);
}
static __be16 *
xfs_dir3_free_bests_p(struct xfs_dir2_free *free)
{
- return (__be16 *)((char *)free + xfs_dir3_free_hdr_size());
+ return (__be16 *)((char *)free + sizeof(struct xfs_dir3_free_hdr));
}
/*
@@ -774,10 +703,13 @@ const struct xfs_dir_ops xfs_dir2_ops = {
.data_entry_tag_p = xfs_dir2_data_entry_tag_p,
.data_bestfree_p = xfs_dir2_data_bestfree_p,
- .data_dot_offset = xfs_dir2_data_dot_offset,
- .data_dotdot_offset = xfs_dir2_data_dotdot_offset,
- .data_first_offset = xfs_dir2_data_first_offset,
- .data_entry_offset = xfs_dir2_data_entry_offset,
+ .data_dot_offset = sizeof(struct xfs_dir2_data_hdr),
+ .data_dotdot_offset = sizeof(struct xfs_dir2_data_hdr) +
+ XFS_DIR2_DATA_ENTSIZE(1),
+ .data_first_offset = sizeof(struct xfs_dir2_data_hdr) +
+ XFS_DIR2_DATA_ENTSIZE(1) +
+ XFS_DIR2_DATA_ENTSIZE(2),
+ .data_entry_offset = sizeof(struct xfs_dir2_data_hdr),
.data_dot_entry_p = xfs_dir2_data_dot_entry_p,
.data_dotdot_entry_p = xfs_dir2_data_dotdot_entry_p,
@@ -785,18 +717,18 @@ const struct xfs_dir_ops xfs_dir2_ops = {
.data_entry_p = xfs_dir2_data_entry_p,
.data_unused_p = xfs_dir2_data_unused_p,
- .leaf_hdr_size = xfs_dir2_leaf_hdr_size,
+ .leaf_hdr_size = sizeof(struct xfs_dir2_leaf_hdr),
.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_size = sizeof(struct xfs_da_node_hdr),
.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_size = xfs_dir2_free_hdr_size,
+ .free_hdr_size = sizeof(struct xfs_dir2_free_hdr),
.free_hdr_to_disk = xfs_dir2_free_hdr_to_disk,
.free_hdr_from_disk = xfs_dir2_free_hdr_from_disk,
.free_max_bests = xfs_dir2_free_max_bests,
@@ -821,10 +753,13 @@ const struct xfs_dir_ops xfs_dir2_ftype_ops = {
.data_entry_tag_p = xfs_dir3_data_entry_tag_p,
.data_bestfree_p = xfs_dir2_data_bestfree_p,
- .data_dot_offset = xfs_dir2_data_dot_offset,
- .data_dotdot_offset = xfs_dir2_data_dotdot_offset,
- .data_first_offset = xfs_dir2_data_first_offset,
- .data_entry_offset = xfs_dir2_data_entry_offset,
+ .data_dot_offset = sizeof(struct xfs_dir2_data_hdr),
+ .data_dotdot_offset = sizeof(struct xfs_dir2_data_hdr) +
+ XFS_DIR3_DATA_ENTSIZE(1),
+ .data_first_offset = sizeof(struct xfs_dir2_data_hdr) +
+ XFS_DIR3_DATA_ENTSIZE(1) +
+ XFS_DIR3_DATA_ENTSIZE(2),
+ .data_entry_offset = sizeof(struct xfs_dir2_data_hdr),
.data_dot_entry_p = xfs_dir2_data_dot_entry_p,
.data_dotdot_entry_p = xfs_dir2_data_dotdot_entry_p,
@@ -832,18 +767,18 @@ const struct xfs_dir_ops xfs_dir2_ftype_ops = {
.data_entry_p = xfs_dir2_data_entry_p,
.data_unused_p = xfs_dir2_data_unused_p,
- .leaf_hdr_size = xfs_dir2_leaf_hdr_size,
+ .leaf_hdr_size = sizeof(struct xfs_dir2_leaf_hdr),
.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_size = sizeof(struct xfs_da_node_hdr),
.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_size = xfs_dir2_free_hdr_size,
+ .free_hdr_size = sizeof(struct xfs_dir2_free_hdr),
.free_hdr_to_disk = xfs_dir2_free_hdr_to_disk,
.free_hdr_from_disk = xfs_dir2_free_hdr_from_disk,
.free_max_bests = xfs_dir2_free_max_bests,
@@ -868,10 +803,13 @@ const struct xfs_dir_ops xfs_dir3_ops = {
.data_entry_tag_p = xfs_dir3_data_entry_tag_p,
.data_bestfree_p = xfs_dir3_data_bestfree_p,
- .data_dot_offset = xfs_dir3_data_dot_offset,
- .data_dotdot_offset = xfs_dir3_data_dotdot_offset,
- .data_first_offset = xfs_dir3_data_first_offset,
- .data_entry_offset = xfs_dir3_data_entry_offset,
+ .data_dot_offset = sizeof(struct xfs_dir3_data_hdr),
+ .data_dotdot_offset = sizeof(struct xfs_dir3_data_hdr) +
+ XFS_DIR3_DATA_ENTSIZE(1),
+ .data_first_offset = sizeof(struct xfs_dir3_data_hdr) +
+ XFS_DIR3_DATA_ENTSIZE(1) +
+ XFS_DIR3_DATA_ENTSIZE(2),
+ .data_entry_offset = sizeof(struct xfs_dir3_data_hdr),
.data_dot_entry_p = xfs_dir3_data_dot_entry_p,
.data_dotdot_entry_p = xfs_dir3_data_dotdot_entry_p,
@@ -879,18 +817,18 @@ const struct xfs_dir_ops xfs_dir3_ops = {
.data_entry_p = xfs_dir3_data_entry_p,
.data_unused_p = xfs_dir3_data_unused_p,
- .leaf_hdr_size = xfs_dir3_leaf_hdr_size,
+ .leaf_hdr_size = sizeof(struct xfs_dir3_leaf_hdr),
.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_size = sizeof(struct xfs_da3_node_hdr),
.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_size = xfs_dir3_free_hdr_size,
+ .free_hdr_size = sizeof(struct xfs_dir3_free_hdr),
.free_hdr_to_disk = xfs_dir3_free_hdr_to_disk,
.free_hdr_from_disk = xfs_dir3_free_hdr_from_disk,
.free_max_bests = xfs_dir3_free_max_bests,
@@ -900,14 +838,14 @@ const struct xfs_dir_ops xfs_dir3_ops = {
};
const struct xfs_dir_ops xfs_dir2_nondir_ops = {
- .node_hdr_size = xfs_da2_node_hdr_size,
+ .node_hdr_size = sizeof(struct xfs_da_node_hdr),
.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_size = sizeof(struct xfs_da3_node_hdr),
.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,