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Diffstat (limited to 'fontconfig/src/fccache.c')
-rw-r--r--fontconfig/src/fccache.c77
1 files changed, 75 insertions, 2 deletions
diff --git a/fontconfig/src/fccache.c b/fontconfig/src/fccache.c
index fbe2d5c01..882dd3eb5 100644
--- a/fontconfig/src/fccache.c
+++ b/fontconfig/src/fccache.c
@@ -37,6 +37,21 @@
# include <unistd.h>
# include <sys/mman.h>
#endif
+#ifdef HAVE_SYS_VFS_H
+#include <sys/vfs.h>
+#endif
+#ifdef HAVE_SYS_STATFS_H
+#include <sys/statfs.h>
+#endif
+#ifdef HAVE_SYS_PARAM_H
+#include <sys/param.h>
+#endif
+#ifdef HAVE_SYS_MOUNT_H
+#include <sys/mount.h>
+#endif
+#ifdef HAVE_MNTENT_H
+#include <mntent.h>
+#endif
#ifndef O_BINARY
#define O_BINARY 0
@@ -144,6 +159,64 @@ FcStat (const FcChar8 *file, struct stat *statb)
#endif
+static FcBool
+FcCacheIsMmapSafe (int fd)
+{
+ FcBool retval = FcTrue;
+ static FcBool is_initialized = FcFalse;
+ static FcBool is_env_available = FcFalse;
+ static FcBool use_mmap = FcFalse;
+
+ if (!is_initialized)
+ {
+ const char *env;
+
+ env = getenv ("FONTCONFIG_USE_MMAP");
+ if (env)
+ {
+ if (FcNameBool ((const FcChar8 *)env, &use_mmap))
+ is_env_available = FcTrue;
+ }
+ is_initialized = FcTrue;
+ }
+ if (is_env_available)
+ return use_mmap;
+#if defined(HAVE_FSTATVFS) && (defined(HAVE_STRUCT_STATVFS_F_BASETYPE) || defined(HAVE_STRUCT_STATVFS_F_FSTYPENAME))
+ struct statvfs buf;
+
+ if (fstatvfs (fd, &buf) == 0)
+ {
+ const char *p;
+#if defined(HAVE_STRUCT_STATVFS_F_BASETYPE)
+ p = buf.f_basetype;
+#elif defined(HAVE_STRUCT_STATVFS_F_FSTYPENAME)
+ p = buf.f_fstypename;
+#endif
+
+ if (strcmp (p, "nfs") == 0)
+ retval = FcFalse;
+ }
+#elif defined(HAVE_FSTATFS) && (defined(HAVE_STRUCT_STATFS_F_FLAGS) || defined(HAVE_STRUCT_STATFS_F_FSTYPENAME) || defined(__linux__))
+ struct statfs buf;
+
+ if (fstatfs (fd, &buf) == 0)
+ {
+# if defined(HAVE_STRUCT_STATFS_F_FLAGS) && defined(MNT_LOCAL)
+ if (!(buf.f_flags & MNT_LOCAL))
+# elif defined(HAVE_STRUCT_STATFS_F_FSTYPENAME)
+ if (strcmp (buf.f_fstypename, "nfs") == 0)
+# elif defined(__linux__)
+ if (buf.f_type == 0x6969) /* nfs */
+# else
+# error "BUG: No way to figure out with fstatfs()"
+# endif
+ retval = FcFalse;
+ }
+#endif
+
+ return retval;
+}
+
static const char bin2hex[] = { '0', '1', '2', '3',
'4', '5', '6', '7',
'8', '9', 'a', 'b',
@@ -602,10 +675,10 @@ FcDirCacheMapFd (int fd, struct stat *fd_stat, struct stat *dir_stat)
}
/*
- * Lage cache files are mmap'ed, smaller cache files are read. This
+ * Large cache files are mmap'ed, smaller cache files are read. This
* balances the system cost of mmap against per-process memory usage.
*/
- if (fd_stat->st_size >= FC_CACHE_MIN_MMAP)
+ if (FcCacheIsMmapSafe (fd) && fd_stat->st_size >= FC_CACHE_MIN_MMAP)
{
#if defined(HAVE_MMAP) || defined(__CYGWIN__)
cache = mmap (0, fd_stat->st_size, PROT_READ, MAP_SHARED, fd, 0);