summaryrefslogtreecommitdiff
path: root/src
diff options
context:
space:
mode:
Diffstat (limited to 'src')
-rwxr-xr-xsrc/ddhardrescue.c39
-rwxr-xr-xsrc/recover.c95
-rwxr-xr-xsrc/recover.h4
-rwxr-xr-xsrc/slices.c128
-rwxr-xr-xsrc/slices.h11
5 files changed, 235 insertions, 42 deletions
diff --git a/src/ddhardrescue.c b/src/ddhardrescue.c
index 56cc5bf..a99b9d8 100755
--- a/src/ddhardrescue.c
+++ b/src/ddhardrescue.c
@@ -6,30 +6,53 @@
#include "recover.h"
int end=0;
+unsigned long c=0;
void sigHookAbrt() {
end=1;
}
int main() {
- char *src, *dst, *ddOpts;
- address_t beginSector, endSector;
- int depth;
+ char *src, *dst, *ddOpts, *dump;
+ address_t beginSector, endSector, blockSize;
+ int /*depth,*/i;
slices_t *slices;
+ slice_t *curr, *toFree;
//TODO Parse args
src="/dev/sdb";
dst="./test.img";
ddOpts="";
beginSector=0;
- endSector=100;
- depth=10;
-
+ endSector=19999;
+// depth=1;
+/*
+ endSector=1999999999;
+ depth=100000;
+*/
//TODO signal...
- slices=recover(src,dst,ddOpts,beginSector,endSector,depth);
+ slices=recover(src,dst,ddOpts,beginSector,endSector/*,depth*/);
- //TODO final reporting
+ blockSize=0;
+ dump=slicesDump(slices, &blockSize, 1000, beginSector, endSector);
+ puts(dump);
+ free(dump);
+ printf("blockSize==%ld\n", blockSize);
+ printf("c==%ld\n", c);
+ printf("slices->count==%d\n", slices->count);
+
+ curr=slices->first;
+ i=0;
+ while (curr!=NULL) {
+ i++;
+ toFree=curr;
+ curr=curr->next;
+ free(toFree);
+ }
+ free(slices);
+
+ printf("i==%d\n", i);
return 0;
}
diff --git a/src/recover.c b/src/recover.c
index c2c2eff..0f305a1 100755
--- a/src/recover.c
+++ b/src/recover.c
@@ -1,7 +1,10 @@
#include <errno.h>
+#include <stdio.h>
#include "recover.h"
-slices_t *recover(char *src, char *dst, char*ddOpts, address_t beginSector, address_t endSector, int depth) {
+extern unsigned long c;
+
+slices_t *recover(char *src, char *dst, char*ddOpts, address_t beginSector, address_t endSector/*, int depth*/) {
slices_t *slices;
slice_t *sliceToRead;
address_t firstError=0, median;
@@ -16,17 +19,21 @@ slices_t *recover(char *src, char *dst, char*ddOpts, address_t beginSector, addr
slicesAppend(slices, sliceToRead);
// Main loop
- while (!end && slices->count < (endSector-beginSector)/depth) {
+ while (!end) { // && slices->count < (endSector-beginSector)/depth) {
// try to recover sliceToRead and split it if read error
- switch ( tryRecoverUntilError(sliceToRead, &firstError) ) {
+ switch ( tryRecoverUntilError(sliceToRead, &firstError, src, dst, ddOpts) ) {
case 0:
// slice recovery has been executed without read error
sliceToRead->status=S_RECOVERED;
break;
case EIO:
- // slice recovery has encuontered a readerror
- res=sliceSplit(sliceToRead, firstError, S_RECOVERED, S_UNREADABLE, S_UNKNOWN);
- if (res!=0) { exit(5); } //TODO
+ // slice recovery has encountered a readerror
+ res=sliceSplit(slices, sliceToRead, firstError, S_RECOVERED, S_UNREADABLE, S_UNKNOWN);
+ if (res<1) {
+ //TODO
+ printf("sliceSplit return %d\n", res);
+ exit(5);
+ }
break;
default:
exit(2); //TODO
@@ -35,34 +42,84 @@ slices_t *recover(char *src, char *dst, char*ddOpts, address_t beginSector, addr
/* Now, search the largest S_UNKNOWN zone
split it in two parts */
sliceToRead=slicesFindLargest(slices, S_UNKNOWN);
- if ( sliceToRead == NULL ) { exit(3); } //TODO
+ if ( sliceToRead == NULL ) {
+ // There is nothing more to recover, bailout
+ end=1;
+ continue;
+ }
+
median=(sliceToRead->begin+sliceToRead->end)/2;
- res=sliceSplit(sliceToRead, median, S_UNKNOWN, S_UNKNOWN, S_UNKNOWN);
- if (res!=0) { exit(4); } //TODO
-
- /* After splitting an S_UNKNOWN zone in two parts
- take the second for further analysis.
- We already now that this first one is just preceded by
- a read error, and errors are frequently grouped in zones,
- so trying to read a sector just after a faulty sector is
- most likely a waste of time.
- */
- sliceToRead=sliceToRead->next;
+ res=sliceSplit(slices, sliceToRead, median, S_UNKNOWN, S_UNKNOWN, S_UNKNOWN);
+ switch (res) {
+ case 1:
+ // No split, try analyse this zone
+ // Should be a slice of length 1
+ break;
+ case 2:
+ /* After splitting an S_UNKNOWN zone in two parts
+ take the second for further analysis.
+ We already now that this first one is just preceded by
+ a read error, and errors are frequently grouped in zones,
+ so trying to read a sector just after a faulty sector is
+ most likely a waste of time.
+ */
+ sliceToRead=sliceToRead->next;
+ break;
+ case 3:
+ // Internal error of sliceSlpit because this set of parameters prevent split by 3
+ exit(5); // TODO
+ break;
+ case -1:
+ // Memory error
+ exit(4); //TODO
+ break;
+ default:
+ // API error, all necessary cases are already listed
+ exit(6); // TODO
+ }
}
return slices;
}
-int tryRecoverUntilError(slice_t *sliceToRead, address_t *firstError) {
+int tryRecoverUntilError(slice_t *sliceToRead, address_t *firstError, char *src, char *dst, char*ddOpts) {
//TODO : implement realy that
+ char ddinvocation[256];
int res;
+ address_t seek, count;
+
+ c++; //XXX This is a debug counter
+ seek=sliceToRead->begin;
+ count=sliceToRead->end - seek + 1;
+ res=snprintf(ddinvocation, 255, "dd %s %s %s seek=%ld skip=%ld count=%ld", src, dst, ddOpts, seek, seek, count);
+ puts(ddinvocation);
+
+ // Simulate that we have systematically a read error at first sector
+ *firstError=sliceToRead->begin;
+ res=EIO;
+
+/*
+ // Simulate for each read, tha we have an error just in the middle if read for mor than one sector
if ( sliceToRead->begin == sliceToRead->end ) {
res=0;
} else {
*firstError=(sliceToRead->begin + sliceToRead->end)/2;
res=EIO;
}
+*/
+
+/*
+ // Simulate for each read a pseudo random error position and generate some cases of full read without error
+ int error=sliceToRead->begin + rand()%count;
+ if ( error % 42 == 0 ) {
+ res=0;
+ } else {
+ res=EIO;
+ *firstError=error;
+ }
+*/
+
return res;
}
diff --git a/src/recover.h b/src/recover.h
index d8b1409..84c7286 100755
--- a/src/recover.h
+++ b/src/recover.h
@@ -5,7 +5,7 @@
extern int end;
-slices_t *recover(char *src, char *dst, char*ddOpts, address_t beginSector, address_t endSector, int depth);
-int tryRecoverUntilError(slice_t *sliceToRead, address_t *firstError);
+slices_t *recover(char *src, char *dst, char*ddOpts, address_t beginSector, address_t endSector/*, int depth*/);
+int tryRecoverUntilError(slice_t *sliceToRead, address_t *firstError, char *src, char *dst, char*ddOpts);
#endif /*RECOVER_H*/
diff --git a/src/slices.c b/src/slices.c
index edae571..8e9aee6 100755
--- a/src/slices.c
+++ b/src/slices.c
@@ -1,8 +1,12 @@
#include <string.h>
#include "slices.h"
+int min(int a, int b) { return (a<b)?a:b; }
+
slice_t *sliceNew(address_t begin, address_t end, sliceStatus_t status, slice_t *next) {
- slice_t *s = malloc(1*sizeof(slice_t));
+ slice_t *s;
+
+ s = malloc(1*sizeof(slice_t));
if (s!=NULL) {
s->begin=begin;
s->end=end;
@@ -13,8 +17,62 @@ slice_t *sliceNew(address_t begin, address_t end, sliceStatus_t status, slice_t
return s;
}
-int sliceSplit(slice_t *slice, address_t splitAt, sliceStatus_t statusBefore, sliceStatus_t statusAt, sliceStatus_t statusAfter) {
- return 1;
+// Return the numbers of slices after split (3 in the general case, 2 or 1 in particular cases. -1 is memory error)
+int sliceSplit(slices_t *slices, slice_t *initialSlice, address_t splitAt, sliceStatus_t statusBefore, sliceStatus_t statusAt, sliceStatus_t statusAfter) {
+ slice_t *secondSlice, *thirdSlice, *rightSlice;
+ int splitAfterSingularity, splitBeforeSingularity;
+
+ /* Basically, we want to split the slice in 3 :
+ [a;b] shoud be transformed in : [a;splitAt-1], [splitAt;splitAt], [splitAt+1;b]
+ There is exceptions and singularities :
+ * If splitAt is not within [a;b], bail out, no coherent solution
+ * If splitAt==a, the first slice should not exists
+ * If splitAt==b, the last slice shoud not exists
+ * If a==b (and so, ==splitAt), there is nothing to split, just change status
+ But, if statusBefore==statusAt, we don't want an interval [splitAt;splitAt], we want just split in 2.
+ This unwanted interval should be kept merged with the first interval.
+
+ For pratical reasons with pointer mess-up, the first action is to split between the second and the last slice
+ and then between he first and second if needed.
+ */
+
+ if ( splitAt < initialSlice->begin || splitAt > initialSlice->end ) return 2;
+
+ // Test before act because we'll change values of the initialSlice because
+ // it would become the firstSlice or even the second one if the first is zero-lenght
+ splitAfterSingularity=(splitAt != initialSlice->end);
+ splitBeforeSingularity=(splitAt != initialSlice->begin) && (statusBefore != statusAt);
+
+ if ( splitAfterSingularity ) {
+ thirdSlice = sliceNew(splitAt+1, initialSlice->end, statusAfter, initialSlice->next);
+ if ( thirdSlice == NULL ) return -1;
+
+ initialSlice->end = splitAt;
+ // No status change because we'll split again in 2 parts or not
+ initialSlice->next = thirdSlice;
+ if ( initialSlice == slices->last ) slices->last = thirdSlice;
+ (slices->count)++;
+
+ rightSlice=thirdSlice;
+ } else {
+ rightSlice=initialSlice->next;
+ }
+
+ if ( splitBeforeSingularity ) {
+ secondSlice = sliceNew(splitAt, splitAt, statusAt, rightSlice);
+ if ( secondSlice == NULL ) return -1;
+
+ initialSlice->end = splitAt-1;
+ initialSlice->status=statusBefore;
+ initialSlice->next = secondSlice;
+ if ( initialSlice == slices->last ) slices->last = secondSlice;
+ (slices->count)++;
+ } else {
+ initialSlice->status=statusAt; // Two cases : a==splitAt or statusAt==statusBefore
+ }
+
+
+ return 1 + (splitBeforeSingularity?1:0) + (splitAfterSingularity?1:0);
}
slices_t *slicesNew() {
@@ -29,25 +87,75 @@ slices_t *slicesNew() {
}
void slicesAppend(slices_t *slices, slice_t *slice) {
-
+ slice->next=NULL; //XXX Could be generalized
+ if (slices->first==NULL || slices->last==NULL) {
+ slices->first = slice;
+ } else {
+ slices->last->next=slice;
+ }
+ slices->last=slice;
+ (slices->count)++;
}
slice_t *slicesFindLargest(slices_t *slices, sliceStatus_t status) {
- return NULL;
+ slice_t *curr, *sMax = NULL;
+ address_t i, iMax = 0;
+
+ curr = slices->first;
+ while (curr != NULL) {
+ i=curr->end - curr->begin + 1;
+ if ( curr->status == status && i > iMax ) {
+ iMax = i;
+ sMax = curr;
+ }
+ curr=curr->next;
+ }
+ return sMax;
}
-char *slicesDump(slices_t *slices, int charCount, address_t begin, address_t end) {
+char *slicesDump(slices_t *slices, address_t *blockSize, unsigned int charCount, address_t begin, address_t end) {
slice_t *curr = slices->first;
- address_t sb,se, blockSize=(end-begin)/(charCount+1);
- char *dump=malloc(1*charCount+1);
+ unsigned int sb,se,i;
+ char *dump, ci;
+
+ // If blockSize is 0, try to autodetect to display entire slice chain
+ if (*blockSize == 0) {
+ *blockSize=(end-begin+1)/(charCount+1);
+ // If we have a too big zoom factor, draw it at 1:1 scale
+ if (*blockSize==0) *blockSize=1;
+ }
+
+ dump = malloc(charCount+1);
+ if (dump==NULL) { return NULL; }
memset(dump, ' ', charCount);
+ dump[charCount]=0;
while (curr != NULL) {
- sb=curr->begin;
- // TODO : boucle pour dessiner les caractères correspondant selon le type de zone. Attention aux cas ou 1 caractère contient la frontière de plusieurs zones (ne pas toujours écraser avec la dernière valeur)
+ sb=curr->begin / *blockSize; //FIXME : gérer le max également !
+ se=min(curr->end / *blockSize,charCount-1);
+
+ switch (curr->status) {
+ case S_UNKNOWN: ci='_'; break;
+ case S_UNREADABLE: ci='!'; break;
+ case S_RECOVERED: ci='.'; break;
+ default: ci='~'; break;
+ }
+
+ for (i=sb;i<=se;i++) {
+ if (dump[i] == ' ' ) {
+ // This is a new information
+ dump[i]=ci;
+ } else if ( dump[i] == ci || dump[i] == '!' ) {
+ // Already the right information or error, don't modify
+ } else {
+ // Multiple information on the same character
+ dump[i]='#';
+ }
+ }
curr=curr->next;
}
return dump;
}
+
diff --git a/src/slices.h b/src/slices.h
index 062c4f4..9f97246 100755
--- a/src/slices.h
+++ b/src/slices.h
@@ -4,8 +4,13 @@
#include <stdint.h>
#include <stdlib.h>
+/* IMPORTANT NOTES
+Slice are inclusive intervals. Let say sliceNew(1,2,S_UNKNOWN,NULL) return a [1;2] interval,
+ so interval lenght is end-begin+1. Here, it is 2 sectors lenght slice.
+*/
+
typedef enum { S_UNKNOWN, S_RECOVERED, S_UNREADABLE } sliceStatus_t;
-typedef uint32_t address_t;
+typedef unsigned long int address_t;
typedef struct _slice {
uint32_t begin, end;
@@ -19,11 +24,11 @@ typedef struct {
} slices_t;
slice_t *sliceNew(address_t begin, address_t end, sliceStatus_t status, slice_t *next);
-int sliceSplit(slice_t *slice, address_t splitAt, sliceStatus_t statusBefore, sliceStatus_t statusAt, sliceStatus_t statusAfter);
+int sliceSplit(slices_t *slices, slice_t *initialSlice, address_t splitAt, sliceStatus_t statusBefore, sliceStatus_t statusAt, sliceStatus_t statusAfter);
slices_t *slicesNew();
void slicesAppend(slices_t *slices, slice_t *slice);
slice_t *slicesFindLargest(slices_t *slices, sliceStatus_t status);
-char *slicesDump(slices_t *slices, int charCount, address_t begin, address_t end);
+char *slicesDump(slices_t *slices, address_t *blockSize, unsigned int charCount, address_t begin, address_t end);
#endif /*SLICES_H*/
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-23 00:02:14 +0000