[PATCH v2] makedumpfile: fix max_mapnr issue on system has over 44-bit addressing
Jingbai Ma
jingbai.ma at hp.com
Fri Oct 11 05:46:51 EDT 2013
This patch will fix a bug of makedumpfile doesn't work correctly on system
has over 44-bit addressing in compression dump mode.
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 max_mapnr_64 only exists in strcut kdump_sub_header, and that only
for compressed kdump format, so for ELF format kdump files (non-compressed),
only the max_mapnr is available, so it still may be truncated for addresses
exceed 44bit (above 16TB).
This patch will change the header_version to 6.
The corresponding patch for crash utility will be sent out separately.
This patch doesn't change sadump_header.
Changelog:
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.
- Only print 64bit start_pfn_64, end_pfn_64 and max_mapnr_64
debug messages for disk dump header version >= 6.
- Change type of bitmap_len in struct DumpInfo, from unsigned long to
unsigned long long.
- Enhance bitmap writting function in reassemble_kdump_header().
Prevent bitmap writting failure if the size of bitmap is too large to
fit a sigle write.
v1:
- http://lists.infradead.org/pipermail/kexec/2013-September/009662.html
Signed-off-by: Jingbai Ma <jingbai.ma at hp.com>
Tested-by: Lisa Mitchell <lisa.mitchell at hp.com>
---
IMPLEMENTATION | 17 +++++++-
diskdump_mod.h | 17 +++++++-
makedumpfile.c | 116 +++++++++++++++++++++++++++++++++++++++++---------------
makedumpfile.h | 2 -
4 files changed, 113 insertions(+), 39 deletions(-)
diff --git a/IMPLEMENTATION b/IMPLEMENTATION
index f0f3135..4feda02 100644
--- a/IMPLEMENTATION
+++ b/IMPLEMENTATION
@@ -48,7 +48,9 @@
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! */
unsigned int total_ram_blocks;/* Number of blocks should be
written */
unsigned int device_blocks; /* Number of total blocks in
@@ -69,14 +71,23 @@
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.
+ 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 */
};
- 1st-bitmap
diff --git a/diskdump_mod.h b/diskdump_mod.h
index af060b6..d907775 100644
--- a/diskdump_mod.h
+++ b/diskdump_mod.h
@@ -48,7 +48,9 @@ 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! */
unsigned int total_ram_blocks;/* Number of blocks should be
written */
unsigned int device_blocks; /* Number of total blocks in
@@ -67,14 +69,23 @@ 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.
+ 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 */
diff --git a/makedumpfile.c b/makedumpfile.c
index b42565c..3ac3ad0 100644
--- a/makedumpfile.c
+++ b/makedumpfile.c
@@ -23,6 +23,7 @@
#include <stddef.h>
#include <ctype.h>
#include <sys/time.h>
+#include <limits.h>
struct symbol_table symbol_table;
struct size_table size_table;
@@ -125,7 +126,7 @@ get_max_mapnr(void)
unsigned long long max_paddr;
if (info->flag_refiltering) {
- info->max_mapnr = info->dh_memory->max_mapnr;
+ info->max_mapnr = info->kh_memory->max_mapnr_64;
return TRUE;
}
@@ -783,6 +784,10 @@ get_kdump_compressed_header_info(char *filename)
ERRMSG("header does not have dump_level member\n");
return FALSE;
}
+
+ if (dh.header_version < 6)
+ kh.max_mapnr_64 = dh.max_mapnr;
+
DEBUG_MSG("diskdump main header\n");
DEBUG_MSG(" signature : %s\n", dh.signature);
DEBUG_MSG(" header_version : %d\n", dh.header_version);
@@ -790,7 +795,7 @@ get_kdump_compressed_header_info(char *filename)
DEBUG_MSG(" block_size : %d\n", dh.block_size);
DEBUG_MSG(" sub_hdr_size : %d\n", dh.sub_hdr_size);
DEBUG_MSG(" bitmap_blocks : %d\n", dh.bitmap_blocks);
- DEBUG_MSG(" max_mapnr : 0x%x\n", dh.max_mapnr);
+ DEBUG_MSG(" max_mapnr(32bit) : 0x%x\n", dh.max_mapnr);
DEBUG_MSG(" total_ram_blocks : %d\n", dh.total_ram_blocks);
DEBUG_MSG(" device_blocks : %d\n", dh.device_blocks);
DEBUG_MSG(" written_blocks : %d\n", dh.written_blocks);
@@ -800,8 +805,14 @@ get_kdump_compressed_header_info(char *filename)
DEBUG_MSG(" phys_base : 0x%lx\n", kh.phys_base);
DEBUG_MSG(" dump_level : %d\n", kh.dump_level);
DEBUG_MSG(" split : %d\n", kh.split);
- DEBUG_MSG(" start_pfn : 0x%lx\n", kh.start_pfn);
- DEBUG_MSG(" end_pfn : 0x%lx\n", kh.end_pfn);
+ DEBUG_MSG(" start_pfn(32bit) : 0x%lx\n", kh.start_pfn);
+ DEBUG_MSG(" end_pfn(32bit) : 0x%lx\n", kh.end_pfn);
+ if (dh.header_version >= 6) {
+ /* A dumpfile contains full 64bit values. */
+ DEBUG_MSG(" start_pfn_64 : 0x%llx\n", kh.start_pfn_64);
+ DEBUG_MSG(" end_pfn_64 : 0x%llx\n", kh.end_pfn_64);
+ DEBUG_MSG(" max_mapnr_64 : 0x%llx\n", kh.max_mapnr_64);
+ }
info->dh_memory = malloc(sizeof(dh));
if (info->dh_memory == NULL) {
@@ -2766,14 +2777,16 @@ int
initialize_bitmap_memory(void)
{
struct disk_dump_header *dh;
+ struct kdump_sub_header *kh;
struct dump_bitmap *bmp;
off_t bitmap_offset;
- int bitmap_len, max_sect_len;
+ off_t bitmap_len, max_sect_len;
unsigned long pfn;
int i, j;
long block_size;
dh = info->dh_memory;
+ kh = info->kh_memory;
block_size = dh->block_size;
bitmap_offset
@@ -2793,7 +2806,7 @@ initialize_bitmap_memory(void)
bmp->offset = bitmap_offset + bitmap_len / 2;
info->bitmap_memory = bmp;
- max_sect_len = divideup(dh->max_mapnr, BITMAP_SECT_LEN);
+ max_sect_len = divideup(kh->max_mapnr_64, BITMAP_SECT_LEN);
info->valid_pages = calloc(sizeof(ulong), max_sect_len);
if (info->valid_pages == NULL) {
ERRMSG("Can't allocate memory for the valid_pages. %s\n",
@@ -4705,7 +4718,7 @@ create_2nd_bitmap(void)
int
prepare_bitmap_buffer(void)
{
- unsigned long tmp;
+ unsigned long long tmp;
/*
* Create 2 bitmaps (1st-bitmap & 2nd-bitmap) on block_size boundary.
@@ -4737,7 +4750,7 @@ prepare_bitmap_buffer(void)
int
prepare_bitmap_buffer_cyclic(void)
{
- unsigned long tmp;
+ unsigned long long tmp;
/*
* Create 2 bitmaps (1st-bitmap & 2nd-bitmap) on block_size boundary.
@@ -5153,11 +5166,12 @@ write_kdump_header(void)
* Write common header
*/
strncpy(dh->signature, KDUMP_SIGNATURE, strlen(KDUMP_SIGNATURE));
- dh->header_version = 5;
+ dh->header_version = 6;
dh->block_size = info->page_size;
dh->sub_hdr_size = sizeof(kh) + size_note;
dh->sub_hdr_size = divideup(dh->sub_hdr_size, dh->block_size);
- dh->max_mapnr = info->max_mapnr;
+ /* dh->max_mapnr may be truncated, full 64bit in kh.max_mapnr_64 */
+ dh->max_mapnr = MIN(info->max_mapnr, UINT_MAX);
dh->nr_cpus = get_nr_cpus();
dh->bitmap_blocks = divideup(info->len_bitmap, dh->block_size);
memcpy(&dh->timestamp, &info->timestamp, sizeof(dh->timestamp));
@@ -5172,12 +5186,21 @@ write_kdump_header(void)
*/
size = sizeof(struct kdump_sub_header);
memset(&kh, 0, size);
+ /* 64bit max_mapnr_64 */
+ kh.max_mapnr_64 = info->max_mapnr;
kh.phys_base = info->phys_base;
kh.dump_level = info->dump_level;
if (info->flag_split) {
kh.split = 1;
+ /* start_pfn and end_pfn may be truncated,
+ * only for compatibility purpose
+ */
kh.start_pfn = info->split_start_pfn;
kh.end_pfn = info->split_end_pfn;
+
+ /* 64bit start_pfn_64 and end_pfn_64 */
+ kh.start_pfn_64 = info->split_start_pfn;
+ kh.end_pfn_64 = info->split_end_pfn;
}
if (has_pt_note()) {
/*
@@ -6421,7 +6444,7 @@ int
write_kdump_bitmap(void)
{
struct cache_data bm;
- long buf_size;
+ long long buf_size;
off_t offset;
int ret = FALSE;
@@ -7796,10 +7819,8 @@ store_splitting_info(void)
if (i == 0) {
memcpy(&dh, &tmp_dh, sizeof(tmp_dh));
- info->max_mapnr = dh.max_mapnr;
if (!set_page_size(dh.block_size))
return FALSE;
- DEBUG_MSG("max_mapnr : %llx\n", info->max_mapnr);
DEBUG_MSG("page_size : %ld\n", info->page_size);
}
@@ -7816,11 +7837,26 @@ store_splitting_info(void)
return FALSE;
if (i == 0) {
+ if (dh.header_version >= 6)
+ info->max_mapnr = kh.max_mapnr_64;
+ else
+ info->max_mapnr = dh.max_mapnr;
+
+ DEBUG_MSG("max_mapnr : %llx\n", info->max_mapnr);
+ }
+
+ if (i == 0) {
info->dump_level = kh.dump_level;
DEBUG_MSG("dump_level : %d\n", info->dump_level);
}
- SPLITTING_START_PFN(i) = kh.start_pfn;
- SPLITTING_END_PFN(i) = kh.end_pfn;
+
+ if (dh.header_version >= 6) {
+ SPLITTING_START_PFN(i) = kh.start_pfn_64;
+ SPLITTING_END_PFN(i) = kh.end_pfn_64;
+ } else {
+ SPLITTING_START_PFN(i) = kh.start_pfn;
+ SPLITTING_END_PFN(i) = kh.end_pfn;
+ }
SPLITTING_OFFSET_EI(i) = kh.offset_eraseinfo;
SPLITTING_SIZE_EI(i) = kh.size_eraseinfo;
}
@@ -7954,6 +7990,7 @@ reassemble_kdump_header(void)
struct disk_dump_header dh;
struct kdump_sub_header kh;
char *buf_bitmap = NULL;
+ ssize_t status, read_size, written_size;
/*
* Write common header.
@@ -7981,6 +8018,8 @@ reassemble_kdump_header(void)
kh.split = 0;
kh.start_pfn = 0;
kh.end_pfn = 0;
+ kh.start_pfn_64 = 0;
+ kh.end_pfn_64 = 0;
if (lseek(info->fd_dumpfile, info->page_size, SEEK_SET) < 0) {
ERRMSG("Can't seek a file(%s). %s\n",
@@ -8030,36 +8069,49 @@ reassemble_kdump_header(void)
SPLITTING_DUMPFILE(0), strerror(errno));
goto out;
}
- if (read(fd, buf_bitmap, info->len_bitmap) != info->len_bitmap) {
- ERRMSG("Can't read a file(%s). %s\n",
- SPLITTING_DUMPFILE(0), strerror(errno));
- goto out;
+ read_size = 0;
+ while (read_size < info->len_bitmap) {
+ status = read(fd, buf_bitmap + read_size, info->len_bitmap
+ - read_size);
+ if (status < 0) {
+ ERRMSG("Can't read a file(%s). %s\n",
+ SPLITTING_DUMPFILE(0), strerror(errno));
+ goto out;
+ }
+ read_size += status;
}
-
if (lseek(info->fd_dumpfile, offset, SEEK_SET) < 0) {
ERRMSG("Can't seek a file(%s). %s\n",
info->name_dumpfile, strerror(errno));
goto out;
}
- if (write(info->fd_dumpfile, buf_bitmap, info->len_bitmap)
- != info->len_bitmap) {
- ERRMSG("Can't write a file(%s). %s\n",
- info->name_dumpfile, strerror(errno));
- goto out;
+ written_size = 0;
+ while (written_size < info->len_bitmap) {
+ status = write(info->fd_dumpfile, buf_bitmap + written_size,
+ info->len_bitmap - written_size);
+ if (status < 0) {
+ ERRMSG("Can't write a file(%s). %s\n",
+ info->name_dumpfile, strerror(errno));
+ goto out;
+ }
+ written_size += status;
}
-
if (lseek(info->fd_bitmap, 0x0, SEEK_SET) < 0) {
ERRMSG("Can't seek a file(%s). %s\n",
info->name_bitmap, strerror(errno));
goto out;
}
- if (write(info->fd_bitmap, buf_bitmap, info->len_bitmap)
- != info->len_bitmap) {
- ERRMSG("Can't write a file(%s). %s\n",
- info->name_bitmap, strerror(errno));
- goto out;
+ written_size = 0;
+ while (written_size < info->len_bitmap) {
+ status = write(info->fd_bitmap, buf_bitmap + written_size,
+ info->len_bitmap - written_size);
+ if (status < 0) {
+ ERRMSG("Can't write a file(%s). %s\n",
+ info->name_bitmap, strerror(errno));
+ goto out;
+ }
+ written_size += status;
}
-
ret = TRUE;
out:
if (fd > 0)
diff --git a/makedumpfile.h b/makedumpfile.h
index a5826e0..4056fa0 100644
--- a/makedumpfile.h
+++ b/makedumpfile.h
@@ -927,7 +927,7 @@ struct DumpInfo {
*/
int block_order;
off_t offset_bitmap1;
- unsigned long len_bitmap; /* size of bitmap(1st and 2nd) */
+ unsigned long long len_bitmap; /* size of bitmap(1st and 2nd) */
struct dump_bitmap *bitmap1;
struct dump_bitmap *bitmap2;
struct disk_dump_header *dump_header;
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