Use FcAtomic to rewrite cache files.
This commit is contained in:
Patrick Lam
parent
099f9a8683
commit
1d879de2d9
132
src/fccache.c
132
src/fccache.c
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@ -38,7 +38,7 @@ static off_t
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FcCacheSkipToArch (int fd, const char * arch);
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static FcBool
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FcCacheMoveDown (int fd, off_t start);
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FcCacheCopyOld (int fd, int fd_orig, off_t start);
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static void *
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FcDirCacheProduce (FcFontSet *set, FcCache * metadata);
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@ -291,7 +291,7 @@ FcBool
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FcGlobalCacheSave (FcGlobalCache *cache,
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const FcChar8 *cache_file)
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{
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int fd;
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int fd, fd_orig;
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FcGlobalCacheDir *dir;
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FcAtomic *atomic;
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off_t current_arch_start = 0, truncate_to;
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@ -308,7 +308,8 @@ FcGlobalCacheSave (FcGlobalCache *cache,
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atomic = FcAtomicCreate (cache_file);
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if (!atomic)
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goto bail0;
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return FcFalse;
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if (!FcAtomicLock (atomic))
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goto bail1;
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fd = open ((char *) FcAtomicNewFile(atomic), O_RDWR | O_CREAT,
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@ -316,21 +317,31 @@ FcGlobalCacheSave (FcGlobalCache *cache,
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if (fd == -1)
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goto bail2;
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fd_orig = open ((char *) FcAtomicOrigFile(atomic), O_RDONLY);
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current_arch_machine_name = FcCacheMachineSignature ();
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current_arch_start = FcCacheSkipToArch(fd, current_arch_machine_name);
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if (fd_orig == -1)
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current_arch_start = 0;
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else
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current_arch_start = FcCacheSkipToArch (fd_orig,
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current_arch_machine_name);
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if (current_arch_start < 0)
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current_arch_start = FcCacheNextOffset (lseek(fd, 0, SEEK_END));
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if (!FcCacheMoveDown(fd, current_arch_start))
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goto bail2;
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if (!FcCacheCopyOld(fd, fd_orig, current_arch_start))
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goto bail3;
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close (fd_orig);
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fd_orig = -1;
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current_arch_start = lseek(fd, 0, SEEK_CUR);
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if (ftruncate (fd, current_arch_start) == -1)
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goto bail2;
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goto bail3;
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header = malloc (10 + strlen (current_arch_machine_name));
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if (!header)
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goto bail1;
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goto bail3;
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truncate_to = current_arch_start + strlen(current_arch_machine_name) + 11;
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for (dir = cache->dirs; dir; dir = dir->next)
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@ -345,7 +356,7 @@ FcGlobalCacheSave (FcGlobalCache *cache,
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sprintf (header, "%8x ", (int)truncate_to);
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strcat (header, current_arch_machine_name);
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if (!FcCacheWriteString (fd, header))
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goto bail1;
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goto bail4;
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for (dir = cache->dirs; dir; dir = dir->next)
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{
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@ -361,10 +372,10 @@ FcGlobalCacheSave (FcGlobalCache *cache,
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FcCacheWriteString (fd, "");
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if (close (fd) == -1)
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goto bail3;
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goto bail25;
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if (!FcAtomicReplaceOrig (atomic))
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goto bail3;
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goto bail25;
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FcAtomicUnlock (atomic);
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FcAtomicDestroy (atomic);
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@ -372,13 +383,19 @@ FcGlobalCacheSave (FcGlobalCache *cache,
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cache->updated = FcFalse;
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return FcTrue;
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bail3:
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bail4:
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free (header);
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bail3:
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if (fd_orig != -1)
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close (fd_orig);
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close (fd);
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bail25:
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FcAtomicDeleteNew (atomic);
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bail2:
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bail2:
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FcAtomicUnlock (atomic);
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bail1:
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bail1:
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FcAtomicDestroy (atomic);
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bail0:
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return FcFalse;
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}
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@ -438,16 +455,34 @@ FcCacheSkipToArch (int fd, const char * arch)
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* down to cover it), and leaves the file pointer at the end of the
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* file. */
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static FcBool
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FcCacheMoveDown (int fd, off_t start)
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FcCacheCopyOld (int fd, int fd_orig, off_t start)
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{
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char * buf = malloc (8192);
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char candidate_arch_machine_name[MACHINE_SIGNATURE_SIZE + 9];
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long bs;
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int c, bytes_skipped;
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off_t loc;
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if (!buf)
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return FcFalse;
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loc = 0;
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lseek (fd, 0, SEEK_SET); lseek (fd_orig, 0, SEEK_SET);
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do
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{
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int b = 8192;
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if (loc + b > start)
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b = start - loc;
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if ((c = read (fd_orig, buf, b)) <= 0)
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break;
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if (write (fd, buf, c) < 0)
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goto bail;
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loc += c;
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}
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while (c > 0);
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lseek (fd, start, SEEK_SET);
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if (FcCacheReadString (fd, candidate_arch_machine_name,
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sizeof (candidate_arch_machine_name)) == 0)
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@ -732,12 +767,13 @@ FcBool
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FcDirCacheWrite (FcFontSet *set, FcStrSet *dirs, const FcChar8 *dir)
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{
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FcChar8 *cache_file = FcStrPlus (dir, (FcChar8 *) "/" FC_DIR_CACHE_FILE);
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int fd, i, dirs_count;
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FcCache metadata;
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off_t current_arch_start = 0, truncate_to;
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int fd, fd_orig, i, dirs_count;
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FcAtomic *atomic;
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FcCache metadata;
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off_t current_arch_start = 0, truncate_to;
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char * current_arch_machine_name, * header;
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void * current_dir_block;
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char *current_arch_machine_name, * header;
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void *current_dir_block;
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if (!cache_file)
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goto bail;
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@ -745,26 +781,43 @@ FcDirCacheWrite (FcFontSet *set, FcStrSet *dirs, const FcChar8 *dir)
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current_dir_block = FcDirCacheProduce (set, &metadata);
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if (metadata.count && !current_dir_block)
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goto bail;
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goto bail0;
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if (FcDebug () & FC_DBG_CACHE)
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printf ("FcDirCacheWriteDir cache_file \"%s\"\n", cache_file);
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fd = open((char *)cache_file, O_RDWR | O_CREAT, 0666);
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if (fd == -1)
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atomic = FcAtomicCreate (cache_file);
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if (!atomic)
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goto bail0;
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if (!FcAtomicLock (atomic))
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goto bail1;
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fd_orig = open((char *)FcAtomicOrigFile (atomic), O_RDONLY, 0666);
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fd = open((char *)FcAtomicNewFile (atomic), O_RDWR | O_CREAT, 0666);
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if (fd == -1)
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goto bail2;
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current_arch_machine_name = FcCacheMachineSignature ();
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current_arch_start = FcCacheSkipToArch(fd, current_arch_machine_name);
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current_arch_start = 0;
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if (fd_orig != -1)
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current_arch_start =
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FcCacheSkipToArch(fd_orig, current_arch_machine_name);
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if (current_arch_start < 0)
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current_arch_start = FcCacheNextOffset (lseek(fd, 0, SEEK_END));
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if (!FcCacheMoveDown(fd, current_arch_start))
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goto bail0;
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if (fd_orig != -1 && !FcCacheCopyOld(fd, fd_orig, current_arch_start))
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goto bail3;
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if (fd_orig != -1)
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close (fd_orig);
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current_arch_start = lseek(fd, 0, SEEK_CUR);
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if (ftruncate (fd, current_arch_start) == -1)
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goto bail0;
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goto bail3;
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/* allocate space for subdir names in this block */
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dirs_count = 0;
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@ -776,11 +829,11 @@ FcDirCacheWrite (FcFontSet *set, FcStrSet *dirs, const FcChar8 *dir)
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truncate_to = FcCacheNextOffset (FcCacheNextOffset (current_arch_start + sizeof (FcCache) + dirs_count) + metadata.count) - current_arch_start;
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header = malloc (10 + strlen (current_arch_machine_name));
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if (!header)
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goto bail0;
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goto bail3;
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sprintf (header, "%8x ", (int)truncate_to);
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strcat (header, current_arch_machine_name);
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if (!FcCacheWriteString (fd, header))
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goto bail1;
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goto bail4;
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for (i = 0; i < dirs->size; i++)
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FcCacheWriteString (fd, (char *)dirs->strs[i]);
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@ -796,18 +849,29 @@ FcDirCacheWrite (FcFontSet *set, FcStrSet *dirs, const FcChar8 *dir)
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/* this actually serves to pad out the cache file, if needed */
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if (ftruncate (fd, current_arch_start + truncate_to) == -1)
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goto bail1;
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goto bail4;
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close(fd);
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if (!FcAtomicReplaceOrig(atomic))
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goto bail4;
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FcAtomicUnlock (atomic);
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FcAtomicDestroy (atomic);
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return FcTrue;
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bail1:
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bail4:
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free (header);
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bail3:
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close (fd);
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bail2:
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FcAtomicUnlock (atomic);
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bail1:
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FcAtomicDestroy (atomic);
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bail0:
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free (current_dir_block);
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bail:
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unlink ((char *)cache_file);
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free (cache_file);
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if (current_dir_block)
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free (current_dir_block);
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bail:
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return FcFalse;
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}
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