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List:       subversion-commits
Subject:    svn commit: r1787619 - in /subversion/branches/1.9.x-strict-rep-sharing: ./ subversion/libsvn_fs_fs/
From:       stefan2 () apache ! org
Date:       2017-03-19 13:16:13
Message-ID: 20170319131613.D2F7B3A0915 () svn01-us-west ! apache ! org
[Download RAW message or body]

Author: stefan2
Date: Sun Mar 19 13:16:13 2017
New Revision: 1787619

URL: http://svn.apache.org/viewvc?rev=1787619&view=rev
Log:
On the 1.9.x-strict-rep-sharing branch:
Merge the actual fix (r1785754) from /trunk, resolve the conflicts
and add the follow-ups (r1786445, r1786446, r1786447 and r1786515).

The conflicts were easily resolved; only the get_file_offset and
build_rep_list calls had to be adapted.  To not introduce new error
codes in backports, we log a generic FS error.

Note that will not pass the tests without r1759116 (svn_io_file_trunk
fix) when using old APRs.

Modified:
    subversion/branches/1.9.x-strict-rep-sharing/   (props changed)
    subversion/branches/1.9.x-strict-rep-sharing/subversion/libsvn_fs_fs/cached_data.c
  subversion/branches/1.9.x-strict-rep-sharing/subversion/libsvn_fs_fs/cached_data.h
    subversion/branches/1.9.x-strict-rep-sharing/subversion/libsvn_fs_fs/transaction.c
  subversion/branches/1.9.x-strict-rep-sharing/subversion/tests/libsvn_fs/fs-test.c

Propchange: subversion/branches/1.9.x-strict-rep-sharing/
------------------------------------------------------------------------------
--- svn:mergeinfo (original)
+++ svn:mergeinfo Sun Mar 19 13:16:13 2017
@@ -103,4 +103,4 @@
 /subversion/branches/verify-at-commit:1462039-1462408
 /subversion/branches/verify-keep-going:1439280-1546110
 /subversion/branches/wc-collate-path:1402685-1480384
-/subversion/trunk:1660545-1660547,1660549-1662901,1663003,1663183-1663184,1663253,166 \
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,1714358,1714790,1715224,1715232,1715262,1715777,1715793,1716808,1717154,1717869,17178 \
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728308,1728387,1729060,1729519,1730856,1734106,1734926,1735179,1735826,1736432,1737122 \
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78,1741096,1741200,1741206,1741401,1745515,1746053,1746277,1746364,1748514,1754190,175 \
6266,1757529,1757532,1757539,1758128-1758130,1758153,1758202,1758204,1758207,1758209,1 \
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,1762338-1762339,1763934,1764034,1764676,1764851,1766240,1766323,1766327,1766352,1766590,1766699,1766704,1766711,1767768,1769152,1769456,17
  69973,1770677,1785734,1785737-1785738,1786447
+/subversion/trunk:1660545-1660547,1660549-1662901,1663003,1663183-1663184,1663253,166 \
3286,1663338,1663347,1663355,1663374,1663450,1663500,1663530,1663671,1663697,1663706,1 \
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,1665850,1665852,1665873,1665886,1665894,1665896,1666096,1666258,1666270,1666272,16663 \
79,1666449,1666690,1666832,1666851,1666965,1667101,1667106-1667107,1667120,1667228,166 \
7233-1667235,1667249-1667250,1667258,1667290,1667301,1667471,1667691-1667693,1667699-1 \
667700,1667715,1667941,1667976,1668320,1668598-1668600,1668602-1668603,1668607-1668608,1668618,1668625,1669743,1669746,1669749,1669945,167
  0139,1670149,1670152,1670329,1670337,1670347,1670353,1671164,1671388,1672295,1672311 \
,1672372,1672404,1672511-1672512,1672578,1672728,1673044,1673062-1673063,1673065,16731 \
53,1673170,1673172,1673197,1673202,1673204,1673228,1673282,1673445,1673691-1673692,167 \
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,1674891,1675771,1675774,1676526,1676535,1676538,1676555,1676564,1676570,1676665,16766 \
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01206,1701270,1701298,1701598,1701603,1701611,1701633,1701638,1701646,1701736,1701792, \
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,1738259,1738659,1738828,1739278,1739280,1740252,1740254,1740316,1741071-1741073,17410 \
78,1741096,1741200,1741206,1741401,1745515,1746053,1746277,1746364,1748514,1754190,175 \
6266,1757529,1757532,1757539,1758128-1758130,1758153,1758202,1758204,1758207,1758209,1 \
758224,1758269,1758385,1758781,1759117-1759124,1759686,1760570,1761334,1761653,1761755 \
,1762338-1762339,1763934,1764034,1764676,1764851,1766240,1766323,1766327,1766352,1766590,1766699,1766704,1766711,1767768,1769152,1769456,17
  69973,1770677,1785734,1785737-1785738,1785754,1786445-1786447,1786515

Modified: subversion/branches/1.9.x-strict-rep-sharing/subversion/libsvn_fs_fs/cached_data.c
                
URL: http://svn.apache.org/viewvc/subversion/branches/1.9.x-strict-rep-sharing/subversion/libsvn_fs_fs/cached_data.c?rev=1787619&r1=1787618&r2=1787619&view=diff
 ==============================================================================
--- subversion/branches/1.9.x-strict-rep-sharing/subversion/libsvn_fs_fs/cached_data.c \
                (original)
+++ subversion/branches/1.9.x-strict-rep-sharing/subversion/libsvn_fs_fs/cached_data.c \
Sun Mar 19 13:16:13 2017 @@ -2029,8 +2029,13 @@ rep_read_contents(void *baton,
       SVN_ERR(skip_contents(rb, rb->fulltext_delivered));
     }
 
-  /* Get the next block of data. */
-  SVN_ERR(get_contents_from_windows(rb, buf, len));
+  /* Get the next block of data.
+   * Keep in mind that the representation might be empty and leave us
+   * already positioned at the end of the rep. */
+  if (rb->off == rb->len)
+    *len = 0;
+  else
+    SVN_ERR(get_contents_from_windows(rb, buf, len));
 
   if (rb->current_fulltext)
     svn_stringbuf_appendbytes(rb->current_fulltext, buf, *len);
@@ -2122,6 +2127,96 @@ svn_fs_fs__get_contents(svn_stream_t **c
 
   return SVN_NO_ERROR;
 }
+
+svn_error_t *
+svn_fs_fs__get_contents_from_file(svn_stream_t **contents_p,
+                                  svn_fs_t *fs,
+                                  representation_t *rep,
+                                  apr_file_t *file,
+                                  apr_off_t offset,
+                                  apr_pool_t *pool)
+{
+  struct rep_read_baton *rb;
+  pair_cache_key_t fulltext_cache_key = { SVN_INVALID_REVNUM, 0 };
+  rep_state_t *rs = apr_pcalloc(pool, sizeof(*rs));
+  svn_fs_fs__rep_header_t *rh;
+
+  /* Initialize the reader baton.  Some members may added lazily
+   * while reading from the stream. */
+  SVN_ERR(rep_read_get_baton(&rb, fs, rep, fulltext_cache_key, pool));
+
+  /* Continue constructing RS. Leave caches as NULL. */
+  rs->size = rep->size;
+  rs->revision = SVN_INVALID_REVNUM;
+  rs->item_index = 0;
+  rs->ver = -1;
+  rs->start = -1;
+
+  /* Provide just enough file access info to allow for a basic read from
+   * FILE but leave all index / footer info with empty values b/c FILE
+   * probably is not a complete revision file. */
+  rs->sfile = apr_pcalloc(pool, sizeof(*rs->sfile));
+  rs->sfile->revision = rep->revision;
+  rs->sfile->pool = pool;
+  rs->sfile->fs = fs;
+  rs->sfile->rfile = apr_pcalloc(pool, sizeof(*rs->sfile->rfile));
+  rs->sfile->rfile->start_revision = SVN_INVALID_REVNUM;
+  rs->sfile->rfile->file = file;
+  rs->sfile->rfile->stream = svn_stream_from_aprfile2(file, TRUE, pool);
+
+  /* Read the rep header. */
+  SVN_ERR(aligned_seek(fs, file, NULL, offset, pool));
+  SVN_ERR(svn_fs_fs__read_rep_header(&rh, rs->sfile->rfile->stream,
+                                     pool, pool));
+  SVN_ERR(get_file_offset(&rs->start, rs, pool));
+  rs->header_size = rh->header_size;
+
+  /* Log the access. */
+  SVN_ERR(dbg_log_access(fs, SVN_INVALID_REVNUM, 0, rh,
+                         SVN_FS_FS__ITEM_TYPE_ANY_REP, pool));
+
+  /* Build the representation list (delta chain). */
+  if (rh->type == svn_fs_fs__rep_plain)
+    {
+      rb->rs_list = apr_array_make(pool, 0, sizeof(rep_state_t *));
+      rb->src_state = rs;
+    }
+  else if (rh->type == svn_fs_fs__rep_self_delta)
+    {
+      rb->rs_list = apr_array_make(pool, 1, sizeof(rep_state_t *));
+      APR_ARRAY_PUSH(rb->rs_list, rep_state_t *) = rs;
+      rb->src_state = NULL;
+    }
+  else
+    {
+      representation_t next_rep = { 0 };
+
+      /* skip "SVNx" diff marker */
+      rs->current = 4;
+
+      /* REP's base rep is inside a proper revision.
+       * It can be reconstructed in the usual way.  */
+      next_rep.revision = rh->base_revision;
+      next_rep.item_index = rh->base_item_index;
+      next_rep.size = rh->base_length;
+      svn_fs_fs__id_txn_reset(&next_rep.txn_id);
+
+      SVN_ERR(build_rep_list(&rb->rs_list, &rb->base_window,
+                             &rb->src_state, &rb->len, rb->fs, &next_rep,
+                             rb->filehandle_pool));
+
+      /* Insert the access to REP as the first element of the delta chain. */
+      svn_sort__array_insert(rb->rs_list, &rs, 0);
+    }
+
+  /* Now, the baton is complete and we can assemble the stream around it. */
+  *contents_p = svn_stream_create(rb, pool);
+  svn_stream_set_read2(*contents_p, NULL /* only full read support */,
+                       rep_read_contents);
+  svn_stream_set_close(*contents_p, rep_read_contents_close);
+
+  return SVN_NO_ERROR;
+}
 
 /* Baton for cache_access_wrapper. Wraps the original parameters of
  * svn_fs_fs__try_process_file_content().

Modified: subversion/branches/1.9.x-strict-rep-sharing/subversion/libsvn_fs_fs/cached_data.h
                
URL: http://svn.apache.org/viewvc/subversion/branches/1.9.x-strict-rep-sharing/subversion/libsvn_fs_fs/cached_data.h?rev=1787619&r1=1787618&r2=1787619&view=diff
 ==============================================================================
--- subversion/branches/1.9.x-strict-rep-sharing/subversion/libsvn_fs_fs/cached_data.h \
                (original)
+++ subversion/branches/1.9.x-strict-rep-sharing/subversion/libsvn_fs_fs/cached_data.h \
Sun Mar 19 13:16:13 2017 @@ -81,6 +81,18 @@ svn_fs_fs__get_contents(svn_stream_t **c
                         svn_boolean_t cache_fulltext,
                         apr_pool_t *pool);
 
+/* Set *CONTENTS_P to be a readable svn_stream_t that receives the text
+   representation REP as seen in filesystem FS.  Read the latest element
+   of the delta chain from FILE at offset OFFSET.
+   Use POOL for allocations. */
+svn_error_t *
+svn_fs_fs__get_contents_from_file(svn_stream_t **contents_p,
+                                  svn_fs_t *fs,
+                                  representation_t *rep,
+                                  apr_file_t *file,
+                                  apr_off_t offset,
+                                  apr_pool_t *pool);
+
 /* Attempt to fetch the text representation of node-revision NODEREV as
    seen in filesystem FS and pass it along with the BATON to the PROCESSOR.
    Set *SUCCESS only of the data could be provided and the processing

Modified: subversion/branches/1.9.x-strict-rep-sharing/subversion/libsvn_fs_fs/transaction.c
                
URL: http://svn.apache.org/viewvc/subversion/branches/1.9.x-strict-rep-sharing/subversion/libsvn_fs_fs/transaction.c?rev=1787619&r1=1787618&r2=1787619&view=diff
 ==============================================================================
--- subversion/branches/1.9.x-strict-rep-sharing/subversion/libsvn_fs_fs/transaction.c \
                (original)
+++ subversion/branches/1.9.x-strict-rep-sharing/subversion/libsvn_fs_fs/transaction.c \
Sun Mar 19 13:16:13 2017 @@ -2128,6 +2128,11 @@ rep_write_get_baton(struct \
rep_write_bat  there may be new duplicate representations within the same uncommitted
    revision, those can be passed in REPS_HASH (maps a sha1 digest onto
    representation_t*), otherwise pass in NULL for REPS_HASH.
+
+   The content of both representations will be compared, taking REP's content
+   from FILE at OFFSET.  Only if they actually match, will *OLD_REP not be
+   NULL.
+
    Use RESULT_POOL for *OLD_REP  allocations and SCRATCH_POOL for temporaries.
    The lifetime of *OLD_REP is limited by both, RESULT_POOL and REP lifetime.
  */
@@ -2135,6 +2140,8 @@ static svn_error_t *
 get_shared_rep(representation_t **old_rep,
                svn_fs_t *fs,
                representation_t *rep,
+               apr_file_t *file,
+               apr_off_t offset,
                apr_hash_t *reps_hash,
                apr_pool_t *result_pool,
                apr_pool_t *scratch_pool)
@@ -2236,6 +2243,78 @@ get_shared_rep(representation_t **old_re
       (*old_rep)->uniquifier = rep->uniquifier;
     }
 
+  /* If we (very likely) found a matching representation, compare the actual
+   * contents such that we can be sure that no rep-cache.db corruption or
+   * hash collision produced a false positive. */
+  if (*old_rep)
+    {
+      apr_off_t old_position;
+      svn_stream_t *contents;
+      svn_stream_t *old_contents;
+      svn_boolean_t same;
+
+      /* The existing representation may itself be part of the current
+       * transaction.  In that case, it may be in different stages of
+       * the commit finalization process.
+       *
+       * OLD_REP_NORM is the same as that OLD_REP but it is assigned
+       * explicitly to REP's transaction if OLD_REP does not point
+       * to an already committed revision.  This then prevents the
+       * revision lookup and the txn data will be accessed.
+       */
+      representation_t old_rep_norm = **old_rep;
+      if (   !SVN_IS_VALID_REVNUM(old_rep_norm.revision)
+          || old_rep_norm.revision > ffd->youngest_rev_cache)
+        old_rep_norm.txn_id = rep->txn_id;
+
+      /* Make sure we can later restore FILE's current position. */
+      SVN_ERR(svn_fs_fs__get_file_offset(&old_position, file, scratch_pool));
+
+      /* Compare the two representations.
+       * Note that the stream comparison might also produce MD5 checksum
+       * errors or other failures in case of SHA1 collisions. */
+      SVN_ERR(svn_fs_fs__get_contents_from_file(&contents, fs, rep, file,
+                                                offset, scratch_pool));
+      SVN_ERR(svn_fs_fs__get_contents(&old_contents, fs, &old_rep_norm,
+                                      FALSE, scratch_pool));
+      err = svn_stream_contents_same2(&same, contents, old_contents,
+                                      scratch_pool);
+
+      /* A mismatch should be extremely rare.
+       * If it does happen, log the event and don't share the rep. */
+      if (!same || err)
+        {
+          /* SHA1 collision or worse.
+             We can continue without rep-sharing, but warn.
+            */
+          svn_stringbuf_t *old_rep_str
+            = svn_fs_fs__unparse_representation(*old_rep,
+                                                ffd->format, FALSE,
+                                                scratch_pool,
+                                                scratch_pool);
+          svn_stringbuf_t *rep_str
+            = svn_fs_fs__unparse_representation(rep,
+                                                ffd->format, FALSE,
+                                                scratch_pool,
+                                                scratch_pool);
+          const char *checksum__str
+            = svn_checksum_to_cstring_display(&checksum, scratch_pool);
+
+          err = svn_error_createf(SVN_ERR_FS_GENERAL,
+                                  err, "SHA1 of reps '%s' and '%s' "
+                                  "matches (%s) but contents differ",
+                                  old_rep_str->data, rep_str->data,
+                                  checksum__str);
+
+          (fs->warning)(fs->warning_baton, err);
+          svn_error_clear(err);
+          *old_rep = NULL;
+        }
+
+      /* Restore FILE's read / write position. */
+      SVN_ERR(svn_io_file_seek(file, APR_SET, &old_position, scratch_pool));
+    }
+
   return SVN_NO_ERROR;
 }
 
@@ -2294,8 +2373,8 @@ rep_write_contents_close(void *baton)
 
   /* Check and see if we already have a representation somewhere that's
      identical to the one we just wrote out. */
-  SVN_ERR(get_shared_rep(&old_rep, b->fs, rep, NULL, b->result_pool,
-                         b->scratch_pool));
+  SVN_ERR(get_shared_rep(&old_rep, b->fs, rep, b->file, b->rep_offset, NULL,
+                         b->result_pool, b->scratch_pool));
 
   if (old_rep)
     {
@@ -2569,8 +2648,8 @@ write_container_rep(representation_t *re
 
   /* Check and see if we already have a representation somewhere that's
      identical to the one we just wrote out. */
-  SVN_ERR(get_shared_rep(&old_rep, fs, rep, reps_hash, scratch_pool,
-                         scratch_pool));
+  SVN_ERR(get_shared_rep(&old_rep, fs, rep, file, offset, reps_hash,
+                         scratch_pool, scratch_pool));
 
   if (old_rep)
     {
@@ -2709,8 +2788,8 @@ write_container_delta_rep(representation
 
   /* Check and see if we already have a representation somewhere that's
      identical to the one we just wrote out. */
-  SVN_ERR(get_shared_rep(&old_rep, fs, rep, reps_hash, scratch_pool,
-                         scratch_pool));
+  SVN_ERR(get_shared_rep(&old_rep, fs, rep, file, offset, reps_hash,
+                         scratch_pool, scratch_pool));
 
   if (old_rep)
     {

Modified: subversion/branches/1.9.x-strict-rep-sharing/subversion/tests/libsvn_fs/fs-test.c
                
URL: http://svn.apache.org/viewvc/subversion/branches/1.9.x-strict-rep-sharing/subversion/tests/libsvn_fs/fs-test.c?rev=1787619&r1=1787618&r2=1787619&view=diff
 ==============================================================================
--- subversion/branches/1.9.x-strict-rep-sharing/subversion/tests/libsvn_fs/fs-test.c \
                (original)
+++ subversion/branches/1.9.x-strict-rep-sharing/subversion/tests/libsvn_fs/fs-test.c \
Sun Mar 19 13:16:13 2017 @@ -7331,8 +7331,9 @@ static struct svn_test_descriptor_t \
test  "freeze and commit"),
     SVN_TEST_OPTS_PASS(commit_with_locked_rep_cache,
                        "test commit with locked rep-cache"),
-    SVN_TEST_OPTS_XFAIL(test_rep_sharing_strict_content_check,
-                       "test rep-sharing on content rather than SHA1"),
+    SVN_TEST_OPTS_XFAIL_OTOH(test_rep_sharing_strict_content_check,
+                             "test rep-sharing on content rather than SHA1",
+                             SVN_TEST_PASS_IF_FS_TYPE_IS(SVN_FS_TYPE_FSFS)),
     SVN_TEST_NULL
   };
 


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