Add the new SQLITE_IOERR_DATA result code and use it in cksumvfs.

Also enhance cksumvfs to emit an sqlite3_log() message whenever it finds
an invalid checksum.

FossilOrigin-Name: a094e8bfdef10d9e5d97f5a9f7c15b0fc547358b83367762ba5c2dfd2c9d0117

ext/misc/cksumvfs.c

@@ -69,7 +69,7 @@
 ** Open database connections using the sqlite3_open() or 
 ** sqlite3_open_v2() interfaces, as normal.  Ordinary database files
 ** (without a checksum) will operate normally.  Databases with 
-** checksums will return an SQLITE_CORRUPT error if a page is
+** checksums will return an SQLITE_IOERR_DATA error if a page is
 ** encountered that contains an invalid checksum.
 **
 ** Checksumming only works on databases that have a reserve-bytes
@@ -138,7 +138,7 @@
 ** The "checksum_verification" pragma will return "1" (true) or "0"
 ** (false) if checksum verification is enabled or disabled, respectively.
 ** "Verification" in this context means the feature that causes
-** SQLITE_CORRUPT errors if a checksum mismatch is detected while
+** SQLITE_IOERR_DATA errors if a checksum mismatch is detected while
 ** reading.  Checksums are always kept up-to-date as long as the
 ** reserve-bytes value of the database is 8, regardless of the setting
 ** of this pragma.  Checksum verification can be disabled (for example)
@@ -190,6 +190,7 @@ typedef struct CksmFile CksmFile;
 /* An open file */
 struct CksmFile {
   sqlite3_file base;    /* IO methods */
+  const char *zFName;   /* Original name of the file */
   char computeCksm;     /* True to compute checksums.
                         ** Always true if reserve size is 8. */
   char verifyCksm;      /* True to verify checksums */
@@ -398,7 +399,10 @@ static int cksmRead(
       u8 cksum[8];
       cksmCompute((u8*)zBuf, iAmt-8, cksum);
       if( memcmp(zBuf+iAmt-8, cksum, 8)!=0 ){
-        rc = SQLITE_CORRUPT;
+        sqlite3_log(SQLITE_IOERR_DATA,
+           "checksum fault offset %lld of \"%s\"",
+           iOfst, p->zFName);
+        rc = SQLITE_IOERR_DATA;
       }
     }
   }
@@ -625,6 +629,7 @@ static int cksmOpen(
     p->isWal = 0;
     p->computeCksm = 0;
   }
+  p->zFName = zName;
 cksm_open_done:
   if( rc ) pFile->pMethods = 0;
   return rc;

manifest

@@ -1,5 +1,5 @@
-C Do\snot\sallow\spage_size\schanges\son\san\sactive\scksumvfs\sdatabase.
-D 2020-04-29T01:09:46.288
+C Add\sthe\snew\sSQLITE_IOERR_DATA\sresult\scode\sand\suse\sit\sin\scksumvfs.\nAlso\senhance\scksumvfs\sto\semit\san\ssqlite3_log()\smessage\swhenever\sit\sfinds\nan\sinvalid\schecksum.
+D 2020-05-01T11:31:43.081
 F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
 F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
 F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@ -285,7 +285,7 @@ F ext/misc/appendvfs.c 3777f22ec1057dc4e5fd89f2fbddcc7a29fbeef1ad038c736c54411bb
 F ext/misc/blobio.c a867c4c4617f6ec223a307ebfe0eabb45e0992f74dd47722b96f3e631c0edb2a
 F ext/misc/btreeinfo.c 26004b7a6be320ec08fc20ca8d0f01fccb00a98cbe0f3197446794ff2a506aa3
 F ext/misc/carray.c 91e9a7f512fda934894bed30464552fffa7d3073b5be04189ae0bd0c59f26bfd
-F ext/misc/cksumvfs.c 452a699066cd2f60224525aa36301a95c9784f230b56fa67de63f76afd6c68d7
+F ext/misc/cksumvfs.c 755627c9112a000bc89653cb5038e080e69c58fa0a5c8e9ebd747f24e5fc01c9
 F ext/misc/closure.c dbfd8543b2a017ae6b1a5843986b22ddf99ff126ec9634a2f4047cd14c85c243
 F ext/misc/completion.c a0efe03edfdc4f717c61e6c9b0bfe2708ff7878010dae3174980a68fdf76aabc
 F ext/misc/compress.c 3354c77a7c8e86e07d849916000cdac451ed96500bfb5bd83b20eb61eee012c9
@@ -535,7 +535,7 @@ F src/resolve.c d36a2b1639e1c33d7b508abfd3452a63e7fd81737f6f3940bfef085fca6f21f4
 F src/rowset.c ba9515a922af32abe1f7d39406b9d35730ed65efab9443dc5702693b60854c92
 F src/select.c c310de94bf67315054587c18a16e7a3e3dc3a98dc79168f0c2b776548d43f6cd
 F src/shell.c.in 86cd0f0412b9739b769fafdfcad28f731882d522042a95c30ab033a5eba68b03
-F src/sqlite.h.in fd6fcfe173accab8d9cb9a843856d9e9fb475f893b60a455e01d8739b5076f0e
+F src/sqlite.h.in 177084a0cef8c3b1df835bdec9530f102026bf0b6e9492a32349d62c30113a66
 F src/sqlite3.rc 5121c9e10c3964d5755191c80dd1180c122fc3a8
 F src/sqlite3ext.h 2d1af80082edffd71c6f96f70ad1ce6a4fb46615ad10291fc77fe0dea9ff0197
 F src/sqliteInt.h 0f3848c46310d197246003f052985b72d1cdbfc0b31e069db76cb5231062fa1d
@@ -1862,7 +1862,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P 0dcf002463f5931c3875d2038d2b97298f1800b1cdfa70485d6430ab758f3b25
-R 0cacdd864635f1bdd3a6aa2f972db6cd
+P 2c17cdce26fd935e6d81ff828f4670291fc014013c93b2a1578506598345ee86
+R 1e877c1fea766b151c81954ab2c1dc73
 U drh
-Z db05e4f978a71bce6c644e170e98280e
+Z dd4cd34bda503d060e1073825c3c95ba

manifest.uuid

@@ -1 +1 @@
-2c17cdce26fd935e6d81ff828f4670291fc014013c93b2a1578506598345ee86
+a094e8bfdef10d9e5d97f5a9f7c15b0fc547358b83367762ba5c2dfd2c9d0117

src/sqlite.h.in

@@ -507,6 +507,7 @@ int sqlite3_exec(
 #define SQLITE_IOERR_BEGIN_ATOMIC      (SQLITE_IOERR | (29<<8))
 #define SQLITE_IOERR_COMMIT_ATOMIC     (SQLITE_IOERR | (30<<8))
 #define SQLITE_IOERR_ROLLBACK_ATOMIC   (SQLITE_IOERR | (31<<8))
+#define SQLITE_IOERR_DATA              (SQLITE_IOERR | (32<<8))
 #define SQLITE_LOCKED_SHAREDCACHE      (SQLITE_LOCKED |  (1<<8))
 #define SQLITE_LOCKED_VTAB             (SQLITE_LOCKED |  (2<<8))
 #define SQLITE_BUSY_RECOVERY           (SQLITE_BUSY   |  (1<<8))