Hello Jingbai,
I have a few additional comments below:
----- Original Message -----
The patch will add support for new compressed dumpfile header_version 6.
This bug was posted here:
http://lists.infradead.org/pipermail/kexec/2013-September/009587.html
This patch will add 3 new fields in struct kdump_sub_header.
unsigned long long start_pfn_64; /* header_version 6 and later */
unsigned long long end_pfn_64; /* header_version 6 and later */
unsigned long long max_mapnr_64; /* header_version 6 and later */
And the old "unsigned int max_mapnr" in struct disk_dump_header will
not be used anymore. But still be there for compatibility purpose.
The corresponding patch for makedumpfile can be found here:
http://lists.infradead.org/pipermail/kexec/2013-October/009727.html
Changelog:
v3:
- Fix a bug that failed to work with old split format kdumps.
v2:
- Rename max_mapnr in struct kdump_sub_header to max_mapnr_64.
- Change type of max_mapnr_64 from unsigned long to unsigned long long.
In x86 PAE mode on x86_32 kernel, the address may exceeds 44bit limit.
- Add start_pfn_64, end_pfn_64 for struct kdump_sub_header.
- Add a 64bit max_mapnr in struct diskdump_data. The max_mapnr_64 in
the sub-header only exists in compressed kdump file format, so can't
be used in diskdump file format.
- Merge a patch from Dave Anderson that fixed bitmap_len issue.
v1:
- http://lists.infradead.org/pipermail/kexec/2013-September/009663.html
Signed-off-by: Jingbai Ma<[email protected]>
Tested-by: Lisa Mitchell<[email protected]>
---
diskdump.c | 122
++++++++++++++++++++++++++++++++++++++++++++++++------------
diskdump.h | 17 +++++++-
2 files changed, 112 insertions(+), 27 deletions(-)
diff --git a/diskdump.c b/diskdump.c
index 0819a3f..bb7a33e 100644
--- a/diskdump.c
+++ b/diskdump.c
@@ -40,11 +40,13 @@ struct diskdump_data {
struct disk_dump_sub_header *sub_header;
struct kdump_sub_header *sub_header_kdump;
+ unsigned long long max_mapnr; /* 64bit max_mapnr */
+
size_t data_offset;
int block_size;
int block_shift;
char *bitmap;
- int bitmap_len;
+ off_t bitmap_len;
char *dumpable_bitmap;
int byte, bit;
char *compressed_page; /* copy of compressed page data */
@@ -170,9 +172,9 @@ add_diskdump_data(char* name)
dd->filename = name;
if (CRASHDEBUG(1))
- fprintf(fp, "%s: start_pfn=%lu, end_pfn=%lu\n", name,
- dd->sub_header_kdump->start_pfn,
- dd->sub_header_kdump->end_pfn);
+ fprintf(fp, "%s: start_pfn=%llu, end_pfn=%llu\n", name,
+ dd->sub_header_kdump->start_pfn_64,
+ dd->sub_header_kdump->end_pfn_64);
}
static void
@@ -199,13 +201,13 @@ get_bit(char *map, int byte, int bit)
}
static inline int
-page_is_ram(unsigned int nr)
+page_is_ram(unsigned long nr)
{
return get_bit(dd->bitmap, nr>> 3, nr& 7);
}
static inline int
-page_is_dumpable(unsigned int nr)
+page_is_dumpable(unsigned long nr)
{
return dd->dumpable_bitmap[nr>>3]& (1<< (nr& 7));
}
@@ -214,7 +216,7 @@ static inline int
dump_is_partial(const struct disk_dump_header *header)
{
return header->bitmap_blocks>=
- divideup(divideup(header->max_mapnr, 8), dd->block_size) * 2;
+ divideup(divideup(dd->max_mapnr, 8), dd->block_size) * 2;
}
static int
@@ -321,6 +323,9 @@ x86_process_elf_notes(void *note_ptr, unsigned long
size_note)
* [40] unsigned long size_note; / header_version 4 and later
/
* [44] off_t offset_eraseinfo; / header_version 5 and later
/
* [52] unsigned long size_eraseinfo; / header_version 5 and later
/
+ * [56] unsigned long long start_pfn_64; / header_version 6 and later
/
+ * [64] unsigned long long end_pfn_64; / header_version 6 and later
/
+ * [72] unsigned long long max_mapnr_64; / header_version 6 and later
/
* };
*
* But when compiled on an ARM processor, each 64-bit "off_t" would be
pushed
@@ -337,7 +342,10 @@ x86_process_elf_notes(void *note_ptr, unsigned long
size_note)
* [40] off_t offset_note; / header_version 4 and later
/
* [48] unsigned long size_note; / header_version 4 and later
/
* [56] off_t offset_eraseinfo; / header_version 5 and later
/
- * [62] unsigned long size_eraseinfo; / header_version 5 and later
/
+ * [64] unsigned long size_eraseinfo; / header_version 5 and later
/
+ * [72] unsigned long long start_pfn_64; / header_version 6 and later
/
+ * [80] unsigned long long end_pfn_64; / header_version 6 and later
/
+ * [88] unsigned long long max_mapnr_64; / header_version 6 and later
/
* };
*
*/
@@ -357,6 +365,10 @@ struct kdump_sub_header_ARM_target {
int pad3;
off_t offset_eraseinfo; /* header_version 5 and later */
unsigned long size_eraseinfo; /* header_version 5 and later */
+ int pad4;
+ unsigned long long start_pfn_64; /* header_version 6 and later */
+ unsigned long long end_pfn_64; /* header_version 6 and later */
+ unsigned long long max_mapnr_64; /* header_version 6 and later */
};
static void
@@ -380,6 +392,15 @@ arm_kdump_header_adjust(int header_version)
kdsh->offset_eraseinfo = kdsh_ARM_target->offset_eraseinfo;
kdsh->size_eraseinfo = kdsh_ARM_target->size_eraseinfo;
}
+ if (header_version>= 6) {
+ kdsh->start_pfn_64 = kdsh_ARM_target->start_pfn_64;
+ kdsh->end_pfn_64 = kdsh_ARM_target->end_pfn_64;
+ kdsh->max_mapnr_64 = kdsh_ARM_target->map_mapnr_64;
+ } else {
+ kdsh->start_pfn_64 = kdsh_ARM_target->start_pfn;
+ kdsh->end_pfn_64 = kdsh_ARM_target->end_pfn;
+ kdsh->max_mapnr_64 = dd->map_mapnr;
+ }
}
#endif /* __i386__&& ARM */
@@ -390,7 +411,10 @@ read_dump_header(char *file)
struct disk_dump_sub_header *sub_header = NULL;
struct kdump_sub_header *sub_header_kdump = NULL;
size_t size;
- int bitmap_len;
+ off_t bitmap_len;
+ char *bufptr;
+ size_t len;
+ size_t bytes_read;
int block_size = (int)sysconf(_SC_PAGESIZE);
off_t offset;
const off_t failed = (off_t)-1;
@@ -540,8 +564,27 @@ restart:
#if defined(__i386__)&& defined(ARM)
arm_kdump_header_adjust(header->header_version);
#endif
+ /* use 64bit max_mapnr in compressed kdump file sub-header */
+ if (header->header_version>= 6)
+ dd->max_mapnr = dd->sub_header_kdump->max_mapnr_64;
+ else {
+ dd->sub_header_kdump->start_pfn_64
+ = dd->sub_header_kdump->start_pfn;
+ dd->sub_header_kdump->end_pfn_64
+ = dd->sub_header_kdump->end_pfn;
+ }
+ } else {
+ /* the 64bit max_mapnr only exists in sub-header of compressed
+ * kdump file, if it's not a compressed kdump file, we have to
+ * use the old 32bit max_mapnr in dumpfile header.
+ * max_mapnr may be truncated here.
+ */
+ dd->max_mapnr = header->max_mapnr;
}
The additional "} else {" segment above doesn't make sense because either
DISKDUMP_VALID() or KDUMP_CMPRS_VALID() are true, so the "else" part will
never be executed.
The patch works because you follow the above section with this piece:
+ if (header->header_version< 6)
+ dd->max_mapnr = header->max_mapnr;
+
/* read memory bitmap */
bitmap_len = block_size * header->bitmap_blocks;
dd->bitmap_len = bitmap_len;
@@ -571,11 +614,27 @@ restart:
DISKDUMP_VALID() ? "diskdump" : "compressed
kdump");
goto err;
}
+#ifdef OLDWAY
if (read(dd->dfd, dd->bitmap, bitmap_len)< bitmap_len) {
error(INFO, "%s: cannot read memory bitmap\n",
DISKDUMP_VALID() ? "diskdump" : "compressed
kdump");
goto err;
}
+#else
+ bufptr = dd->bitmap;
+ len = bitmap_len;
+ while (len) {
+ bytes_read = read(dd->dfd, bufptr, len);
+ if (bytes_read< 0) {
+ error(INFO, "%s: cannot read memory bitmap\n",
+ DISKDUMP_VALID() ? "diskdump"
+ : "compressed kdump");
+ goto err;
+ }
+ len -= bytes_read;
+ bufptr += bytes_read;
+ }
+#endif
You can get rid of the "#ifdef OLDWAY" section -- I left that there when
I gave Lisa my debug version of the function so that the difference would
be obvious.
}
if (dump_is_partial(header))
@@ -679,13 +738,13 @@ restart:
}
if (!is_split) {
- max_sect_len = divideup(header->max_mapnr, BITMAP_SECT_LEN);
+ max_sect_len = divideup(dd->max_mapnr, BITMAP_SECT_LEN);
pfn = 0;
dd->filename = file;
}
else {
- ulong start = sub_header_kdump->start_pfn;
- ulong end = sub_header_kdump->end_pfn;
+ unsigned long long start = sub_header_kdump->start_pfn_64;
+ unsigned long long end = sub_header_kdump->end_pfn_64;
max_sect_len = divideup(end - start + 1, BITMAP_SECT_LEN);
pfn = start;
}
@@ -727,8 +786,9 @@ pfn_to_pos(ulong pfn)
ulong p1, p2;
if (KDUMP_SPLIT()) {
- p1 = pfn - dd->sub_header_kdump->start_pfn;
- p2 = round(p1, BITMAP_SECT_LEN) +
dd->sub_header_kdump->start_pfn;
+ p1 = pfn - dd->sub_header_kdump->start_pfn_64;
+ p2 = round(p1, BITMAP_SECT_LEN)
+ + dd->sub_header_kdump->start_pfn_64;
}
else {
p1 = pfn;
@@ -1034,12 +1094,12 @@ read_diskdump(int fd, void *bufptr, int cnt, ulong
addr, physaddr_t paddr)
if (KDUMP_SPLIT()) {
/* Find proper dd */
int i;
- unsigned long start_pfn;
- unsigned long end_pfn;
+ unsigned long long start_pfn;
+ unsigned long long end_pfn;
for (i=0; i<num_dumpfiles; i++) {
- start_pfn = dd_list[i]->sub_header_kdump->start_pfn;
- end_pfn = dd_list[i]->sub_header_kdump->end_pfn;
+ start_pfn = dd_list[i]->sub_header_kdump->start_pfn_64;
+ end_pfn = dd_list[i]->sub_header_kdump->end_pfn_64;
if ((pfn>= start_pfn)&& (pfn<= end_pfn)) {
dd = dd_list[i];
break;
@@ -1058,14 +1118,14 @@ read_diskdump(int fd, void *bufptr, int cnt, ulong
addr, physaddr_t paddr)
curpaddr = paddr& ~((physaddr_t)(dd->block_size-1));
page_offset = paddr& ((physaddr_t)(dd->block_size-1));
- if ((pfn>= dd->header->max_mapnr) || !page_is_ram(pfn)) {
+ if ((pfn>= dd->max_mapnr) || !page_is_ram(pfn)) {
if (CRASHDEBUG(8)) {
fprintf(fp, "read_diskdump: SEEK_ERROR: "
"paddr/pfn: %llx/%lx ",
(ulonglong)paddr, pfn);
- if (pfn>= dd->header->max_mapnr)
- fprintf(fp, "max_mapnr: %x\n",
- dd->header->max_mapnr);
+ if (pfn>= dd->max_mapnr)
+ fprintf(fp, "max_mapnr: %llx\n",
+ dd->max_mapnr);
else
fprintf(fp, "!page_is_ram\n");
}
@@ -1517,7 +1577,7 @@ __diskdump_memory_dump(FILE *fp)
fprintf(fp, " block_size: %d\n", dh->block_size);
fprintf(fp, " sub_hdr_size: %d\n", dh->sub_hdr_size);
fprintf(fp, " bitmap_blocks: %u\n", dh->bitmap_blocks);
- fprintf(fp, " max_mapnr: %u\n", dh->max_mapnr);
+ fprintf(fp, " max_mapnr: %llu\n", dd->max_mapnr);
Please display the original dh->max_mapnr as it exists in the dumpfile
header, regardless whether it is the obsolete version or not.
Your new "dd->max_mapnr" should be displayed further down in the function
where the other diskdump_data fields are shown.
fprintf(fp, " total_ram_blocks: %u\n", dh->total_ram_blocks);
fprintf(fp, " device_blocks: %u\n", dh->device_blocks);
fprintf(fp, " written_blocks: %u\n", dh->written_blocks);
@@ -1662,6 +1722,20 @@ __diskdump_memory_dump(FILE *fp)
dump_eraseinfo(fp);
}
}
+ if (dh->header_version>= 6) {
+ fprintf(fp, " start_pfn_64: ");
+ if (KDUMP_SPLIT())
+ fprintf(fp, "%lld (0x%llx)\n",
+ kdsh->start_pfn_64, kdsh->start_pfn_64);
+ else
+ fprintf(fp, "(unused)\n");
+ fprintf(fp, " end_pfn_64: ");
+ if (KDUMP_SPLIT())
+ fprintf(fp, "%lld (0x%llx)\n",
+ kdsh->end_pfn_64, kdsh->end_pfn_64);
+ else
+ fprintf(fp, "(unused)\n");
+ }
fprintf(fp, "\n");
} else
fprintf(fp, "(n/a)\n\n");
@@ -1670,7 +1744,7 @@ __diskdump_memory_dump(FILE *fp)
fprintf(fp, " block_size: %d\n", dd->block_size);
fprintf(fp, " block_shift: %d\n", dd->block_shift);
fprintf(fp, " bitmap: %lx\n", (ulong)dd->bitmap);
- fprintf(fp, " bitmap_len: %d\n", dd->bitmap_len);
+ fprintf(fp, " bitmap_len: %ld\n", dd->bitmap_len);
fprintf(fp, " dumpable_bitmap: %lx\n", (ulong)dd->dumpable_bitmap);
fprintf(fp, " byte: %d\n", dd->byte);
fprintf(fp, " bit: %d\n", dd->bit);
diff --git a/diskdump.h b/diskdump.h
index 9ab10b6..0492351 100644
--- a/diskdump.h
+++ b/diskdump.h
@@ -42,7 +42,9 @@ struct disk_dump_header {
header in blocks */
unsigned int bitmap_blocks; /* Size of Memory bitmap in
block */
- unsigned int max_mapnr; /* = max_mapnr */
+ unsigned int max_mapnr; /* = max_mapnr, 32bit only,
+ full 64bit in sub header.
+ Do NOT use this anymore! */
You can change this comment to read "obsolete" so that it is similar to
Daisuke's
suggestion for makedumpfile.
unsigned int total_ram_blocks;/* Number of blocks should be
written */
unsigned int device_blocks; /* Number of total blocks in
@@ -61,14 +63,23 @@ struct kdump_sub_header {
unsigned long phys_base;
int dump_level; /* header_version 1 and later */
int split; /* header_version 2 and later */
- unsigned long start_pfn; /* header_version 2 and later */
- unsigned long end_pfn; /* header_version 2 and later */
+ unsigned long start_pfn; /* header_version 2 and later,
+ 32bit only, full 64bit in
+ start_pfn_64.
+ Do not use this anymore! */
+ unsigned long end_pfn; /* header_version 2 and later,
+ 32bit only, full 64bit in
+ end_pfn_64.
Same here...
+ Do not use this anymore! */
off_t offset_vmcoreinfo; /* header_version 3 and later */
unsigned long size_vmcoreinfo; /* header_version 3 and later */
off_t offset_note; /* header_version 4 and later */
unsigned long size_note; /* header_version 4 and later */
off_t offset_eraseinfo; /* header_version 5 and later */
unsigned long size_eraseinfo; /* header_version 5 and later */
+ unsigned long long start_pfn_64; /* header_version 6 and later */
+ unsigned long long end_pfn_64; /* header_version 6 and later */
+ unsigned long long max_mapnr_64; /* header_version 6 and later */
};
/* page flags */
Thanks,
Dave
