From: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
(Ab)use the btheight command to calculate the geometry of the incore
extent tree.
Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
---
db/btheight.c | 87 +++++++++++++++++++++++++++++++++++++++------------------
1 file changed, 60 insertions(+), 27 deletions(-)
diff --git a/db/btheight.c b/db/btheight.c
index e2c9759f..be604ebc 100644
--- a/db/btheight.c
+++ b/db/btheight.c
@@ -22,18 +22,37 @@ static int rmap_maxrecs(struct xfs_mount *mp, int blocklen, int leaf)
return libxfs_rmapbt_maxrecs(blocklen, leaf);
}
+static int iext_maxrecs(struct xfs_mount *mp, int blocklen, int leaf)
+{
+ blocklen -= 2 * sizeof(void *);
+
+ return blocklen / sizeof(struct xfs_bmbt_rec);
+}
+
+static int disk_blocksize(struct xfs_mount *mp)
+{
+ return mp->m_sb.sb_blocksize;
+}
+
+static int iext_blocksize(struct xfs_mount *mp)
+{
+ return 256;
+}
+
struct btmap {
const char *tag;
int (*maxrecs)(struct xfs_mount *mp, int blocklen,
int leaf);
+ int (*default_blocksize)(struct xfs_mount *mp);
} maps[] = {
- {"bnobt", libxfs_allocbt_maxrecs},
- {"cntbt", libxfs_allocbt_maxrecs},
- {"inobt", libxfs_inobt_maxrecs},
- {"finobt", libxfs_inobt_maxrecs},
- {"bmapbt", libxfs_bmbt_maxrecs},
- {"refcountbt", refc_maxrecs},
- {"rmapbt", rmap_maxrecs},
+ {"bnobt", libxfs_allocbt_maxrecs, disk_blocksize},
+ {"cntbt", libxfs_allocbt_maxrecs, disk_blocksize},
+ {"inobt", libxfs_inobt_maxrecs, disk_blocksize},
+ {"finobt", libxfs_inobt_maxrecs, disk_blocksize},
+ {"bmapbt", libxfs_bmbt_maxrecs, disk_blocksize},
+ {"refcountbt", refc_maxrecs, disk_blocksize},
+ {"rmapbt", rmap_maxrecs, disk_blocksize},
+ {"iext", iext_maxrecs, iext_blocksize},
};
static void
@@ -108,7 +127,7 @@ calc_height(
static int
construct_records_per_block(
char *tag,
- int blocksize,
+ int *blocksize,
unsigned int *records_per_block)
{
char *toktag;
@@ -119,8 +138,10 @@ construct_records_per_block(
for (i = 0, m = maps; i < ARRAY_SIZE(maps); i++, m++) {
if (!strcmp(m->tag, tag)) {
- records_per_block[0] = m->maxrecs(mp, blocksize, 1);
- records_per_block[1] = m->maxrecs(mp, blocksize, 0);
+ if (*blocksize < 0)
+ *blocksize = m->default_blocksize(mp);
+ records_per_block[0] = m->maxrecs(mp, *blocksize, 1);
+ records_per_block[1] = m->maxrecs(mp, *blocksize, 0);
return 0;
}
}
@@ -178,38 +199,50 @@ construct_records_per_block(
fprintf(stderr, _("%s: header type not found.\n"), tag);
goto out;
}
- if (!strcmp(p, "short"))
+ if (!strcmp(p, "short")) {
+ if (*blocksize < 0)
+ *blocksize = mp->m_sb.sb_blocksize;
blocksize -= XFS_BTREE_SBLOCK_LEN;
- else if (!strcmp(p, "shortcrc"))
+ } else if (!strcmp(p, "shortcrc")) {
+ if (*blocksize < 0)
+ *blocksize = mp->m_sb.sb_blocksize;
blocksize -= XFS_BTREE_SBLOCK_CRC_LEN;
- else if (!strcmp(p, "long"))
+ } else if (!strcmp(p, "long")) {
+ if (*blocksize < 0)
+ *blocksize = mp->m_sb.sb_blocksize;
blocksize -= XFS_BTREE_LBLOCK_LEN;
- else if (!strcmp(p, "longcrc"))
+ } else if (!strcmp(p, "longcrc")) {
+ if (*blocksize < 0)
+ *blocksize = mp->m_sb.sb_blocksize;
blocksize -= XFS_BTREE_LBLOCK_CRC_LEN;
- else {
+ } else if (!strcmp(p, "iext")) {
+ if (*blocksize < 0)
+ *blocksize = 256;
+ blocksize -= 2 * sizeof(void *);
+ } else {
fprintf(stderr, _("%s: unrecognized btree header type."),
p);
goto out;
}
- if (record_size > blocksize) {
+ if (record_size > *blocksize) {
fprintf(stderr,
_("%s: record size must be less than %u bytes.\n"),
- tag, blocksize);
+ tag, *blocksize);
goto out;
}
- if (key_size > blocksize) {
+ if (key_size > *blocksize) {
fprintf(stderr,
_("%s: key size must be less than %u bytes.\n"),
- tag, blocksize);
+ tag, *blocksize);
goto out;
}
- if (ptr_size > blocksize) {
+ if (ptr_size > *blocksize) {
fprintf(stderr,
_("%s: pointer size must be less than %u bytes.\n"),
- tag, blocksize);
+ tag, *blocksize);
goto out;
}
@@ -221,8 +254,8 @@ construct_records_per_block(
goto out;
}
- records_per_block[0] = blocksize / record_size;
- records_per_block[1] = blocksize / (key_size + ptr_size);
+ records_per_block[0] = *blocksize / record_size;
+ records_per_block[1] = *blocksize / (key_size + ptr_size);
ret = 0;
out:
free(toktag);
@@ -238,12 +271,12 @@ report(
char *tag,
unsigned int report_what,
unsigned long long nr_records,
- unsigned int blocksize)
+ int blocksize)
{
unsigned int records_per_block[2];
int ret;
- ret = construct_records_per_block(tag, blocksize, records_per_block);
+ ret = construct_records_per_block(tag, &blocksize, records_per_block);
if (ret)
return;
@@ -302,7 +335,7 @@ btheight_f(
int argc,
char **argv)
{
- long long blocksize = mp->m_sb.sb_blocksize;
+ long long blocksize = -1;
uint64_t nr_records = 0;
int report_what = REPORT_DEFAULT;
int i, c;
@@ -355,7 +388,7 @@ _("The largest block size this command will consider is %u bytes.\n"),
return 0;
}
- if (blocksize < 128) {
+ if (blocksize >= 0 && blocksize < 128) {
fprintf(stderr,
_("The smallest block size this command will consider is 128 bytes.\n"));
return 0;
