[Libguestfs] [PATCH 1/3] ext2: create a struct for the OCaml 't' type
Pino Toscano
ptoscano at redhat.com
Wed Jul 30 15:36:26 UTC 2014
Use an helper struct for holding the ext2_filsys variable, so that can
be used to add more data.
---
src/ext2fs-c.c | 77 +++++++++++++++++++++++++++++++---------------------------
1 file changed, 41 insertions(+), 36 deletions(-)
diff --git a/src/ext2fs-c.c b/src/ext2fs-c.c
index 70755c9..8eab24c 100644
--- a/src/ext2fs-c.c
+++ b/src/ext2fs-c.c
@@ -52,6 +52,11 @@
/* fts.h in glibc is broken, forcing us to use the GNUlib alternative. */
#include "fts_.h"
+struct ext2_data
+{
+ ext2_filsys fs;
+};
+
static void initialize (void) __attribute__((constructor));
static void
@@ -78,18 +83,18 @@ ext2_handle_closed (void)
caml_failwith ("ext2fs: function called on a closed handle");
}
-#define Ext2fs_val(v) (*((ext2_filsys *)Data_custom_val(v)))
+#define Ext2fs_val(v) (*((struct ext2_data *)Data_custom_val(v)))
static void
ext2_finalize (value fsv)
{
- ext2_filsys fs = Ext2fs_val (fsv);
+ struct ext2_data data = Ext2fs_val (fsv);
- if (fs) {
+ if (data.fs) {
#ifdef HAVE_EXT2FS_CLOSE2
- ext2fs_close2 (fs, EXT2_FLAG_FLUSH_NO_SYNC);
+ ext2fs_close2 (data.fs, EXT2_FLAG_FLUSH_NO_SYNC);
#else
- ext2fs_close (fs);
+ ext2fs_close (data.fs);
#endif
}
}
@@ -104,14 +109,14 @@ static struct custom_operations ext2_custom_operations = {
};
static value
-Val_ext2fs (ext2_filsys fs)
+Val_ext2fs (struct ext2_data *data)
{
CAMLparam0 ();
CAMLlocal1 (fsv);
fsv = caml_alloc_custom (&ext2_custom_operations,
- sizeof (ext2_filsys), 0, 1);
- Ext2fs_val (fsv) = fs;
+ sizeof (struct ext2_data), 0, 1);
+ Ext2fs_val (fsv) = *data;
CAMLreturn (fsv);
}
@@ -122,18 +127,18 @@ supermin_ext2fs_open (value filev)
CAMLlocal1 (fsv);
int fs_flags = EXT2_FLAG_RW;
errcode_t err;
- ext2_filsys fs;
+ struct ext2_data data;
#ifdef EXT2_FLAG_64BITS
fs_flags |= EXT2_FLAG_64BITS;
#endif
err = ext2fs_open (String_val (filev), fs_flags, 0, 0,
- unix_io_manager, &fs);
+ unix_io_manager, &data.fs);
if (err != 0)
ext2_error_to_exception ("ext2fs_open", err, String_val (filev));
- fsv = Val_ext2fs (fs);
+ fsv = Val_ext2fs (&data);
CAMLreturn (fsv);
}
@@ -145,7 +150,7 @@ supermin_ext2fs_close (value fsv)
ext2_finalize (fsv);
/* So we don't double-free in the finalizer. */
- Ext2fs_val (fsv) = NULL;
+ Ext2fs_val (fsv).fs = NULL;
CAMLreturn (Val_unit);
}
@@ -154,14 +159,14 @@ value
supermin_ext2fs_read_bitmaps (value fsv)
{
CAMLparam1 (fsv);
- ext2_filsys fs;
+ struct ext2_data data;
errcode_t err;
- fs = Ext2fs_val (fsv);
- if (fs == NULL)
+ data = Ext2fs_val (fsv);
+ if (data.fs == NULL)
ext2_handle_closed ();
- err = ext2fs_read_bitmaps (fs);
+ err = ext2fs_read_bitmaps (data.fs);
if (err != 0)
ext2_error_to_exception ("ext2fs_read_bitmaps", err, NULL);
@@ -173,7 +178,7 @@ static void ext2_empty_inode (ext2_filsys fs, ext2_ino_t dir_ino, const char *di
static void ext2_write_file (ext2_filsys fs, ext2_ino_t ino, const char *buf, size_t size, const char *filename);
static void ext2_link (ext2_filsys fs, ext2_ino_t dir_ino, const char *basename, ext2_ino_t ino, int dir_ft);
static void ext2_clean_path (ext2_filsys fs, ext2_ino_t dir_ino, const char *dirname, const char *basename, int isdir);
-static void ext2_copy_file (ext2_filsys fs, const char *src, const char *dest);
+static void ext2_copy_file (struct ext2_data *data, const char *src, const char *dest);
/* Copy the host filesystem file/directory 'src' to the destination
* 'dest'. Directories are NOT copied recursively - the directory is
@@ -185,13 +190,13 @@ supermin_ext2fs_copy_file_from_host (value fsv, value srcv, value destv)
CAMLparam3 (fsv, srcv, destv);
const char *src = String_val (srcv);
const char *dest = String_val (destv);
- ext2_filsys fs;
+ struct ext2_data data;
- fs = Ext2fs_val (fsv);
- if (fs == NULL)
+ data = Ext2fs_val (fsv);
+ if (data.fs == NULL)
ext2_handle_closed ();
- ext2_copy_file (fs, src, dest);
+ ext2_copy_file (&data, src, dest);
CAMLreturn (Val_unit);
}
@@ -207,7 +212,7 @@ supermin_ext2fs_copy_dir_recursively_from_host (value fsv,
const char *srcdir = String_val (srcdirv);
const char *destdir = String_val (destdirv);
size_t srclen = strlen (srcdir);
- ext2_filsys fs;
+ struct ext2_data data;
char *paths[2];
FTS *fts;
FTSENT *entry;
@@ -216,8 +221,8 @@ supermin_ext2fs_copy_dir_recursively_from_host (value fsv,
size_t i, n;
int r;
- fs = Ext2fs_val (fsv);
- if (fs == NULL)
+ data = Ext2fs_val (fsv);
+ if (data.fs == NULL)
ext2_handle_closed ();
paths[0] = (char *) srcdir;
@@ -269,7 +274,7 @@ supermin_ext2fs_copy_dir_recursively_from_host (value fsv,
}
}
- ext2_copy_file (fs, entry->fts_path, destpath);
+ ext2_copy_file (&data, entry->fts_path, destpath);
free (destpath);
}
@@ -538,7 +543,7 @@ read_whole_file (const char *filename, size_t size)
/* Copy a file (or directory etc) from the host. */
static void
-ext2_copy_file (ext2_filsys fs, const char *src, const char *dest)
+ext2_copy_file (struct ext2_data *data, const char *src, const char *dest)
{
errcode_t err;
struct stat statbuf;
@@ -551,13 +556,13 @@ ext2_copy_file (ext2_filsys fs, const char *src, const char *dest)
* Note we cheat by looking at fs->device_name (which is the output
* file). We could store this filename separately.
*/
- if (fs->device_name && statvfs (fs->device_name, &statvfsbuf) == 0) {
+ if (data->fs->device_name && statvfs (data->fs->device_name, &statvfsbuf) == 0) {
uint64_t space = statvfsbuf.f_bavail * statvfsbuf.f_bsize;
uint64_t estimate = 128*1024 + 2 * statbuf.st_size;
if (space < estimate)
unix_error (ENOSPC, (char *) "statvfs",
- caml_copy_string (fs->device_name));
+ caml_copy_string (data->fs->device_name));
}
#if 0
@@ -638,7 +643,7 @@ ext2_copy_file (ext2_filsys fs, const char *src, const char *dest)
cont:
/* Look up the parent directory. */
- err = ext2fs_namei (fs, EXT2_ROOT_INO, EXT2_ROOT_INO, dirname, &dir_ino);
+ err = ext2fs_namei (data->fs, EXT2_ROOT_INO, EXT2_ROOT_INO, dirname, &dir_ino);
if (err != 0) {
/* This is the most popular supermin "WTF" error, so make
* sure we capture as much information as possible.
@@ -654,7 +659,7 @@ ext2_copy_file (ext2_filsys fs, const char *src, const char *dest)
}
}
- ext2_clean_path (fs, dir_ino, dirname, basename, S_ISDIR (statbuf.st_mode));
+ ext2_clean_path (data->fs, dir_ino, dirname, basename, S_ISDIR (statbuf.st_mode));
int dir_ft;
@@ -670,13 +675,13 @@ ext2_copy_file (ext2_filsys fs, const char *src, const char *dest)
goto skip_unreadable_file;
}
- ext2_empty_inode (fs, dir_ino, dirname, basename,
+ ext2_empty_inode (data->fs, dir_ino, dirname, basename,
statbuf.st_mode, statbuf.st_uid, statbuf.st_gid,
statbuf.st_ctime, statbuf.st_atime, statbuf.st_mtime,
0, 0, EXT2_FT_REG_FILE, &ino);
if (statbuf.st_size > 0) {
- ext2_write_file (fs, ino, buf, statbuf.st_size, dest);
+ ext2_write_file (data->fs, ino, buf, statbuf.st_size, dest);
free (buf);
}
skip_unreadable_file: ;
@@ -684,7 +689,7 @@ ext2_copy_file (ext2_filsys fs, const char *src, const char *dest)
/* Create a symlink. */
else if (S_ISLNK (statbuf.st_mode)) {
ext2_ino_t ino;
- ext2_empty_inode (fs, dir_ino, dirname, basename,
+ ext2_empty_inode (data->fs, dir_ino, dirname, basename,
statbuf.st_mode, statbuf.st_uid, statbuf.st_gid,
statbuf.st_ctime, statbuf.st_atime, statbuf.st_mtime,
0, 0, EXT2_FT_SYMLINK, &ino);
@@ -693,11 +698,11 @@ ext2_copy_file (ext2_filsys fs, const char *src, const char *dest)
ssize_t r = readlink (src, buf, sizeof buf);
if (r == -1)
unix_error (errno, (char *) "readlink", caml_copy_string (src));
- ext2_write_file (fs, ino, buf, r, dest);
+ ext2_write_file (data->fs, ino, buf, r, dest);
}
/* Create directory. */
else if (S_ISDIR (statbuf.st_mode))
- ext2_mkdir (fs, dir_ino, dirname, basename,
+ ext2_mkdir (data->fs, dir_ino, dirname, basename,
statbuf.st_mode, statbuf.st_uid, statbuf.st_gid,
statbuf.st_ctime, statbuf.st_atime, statbuf.st_mtime);
/* Create a special file. */
@@ -714,7 +719,7 @@ ext2_copy_file (ext2_filsys fs, const char *src, const char *dest)
} else if (S_ISSOCK (statbuf.st_mode)) {
dir_ft = EXT2_FT_SOCK;
make_special:
- ext2_empty_inode (fs, dir_ino, dirname, basename,
+ ext2_empty_inode (data->fs, dir_ino, dirname, basename,
statbuf.st_mode, statbuf.st_uid, statbuf.st_gid,
statbuf.st_ctime, statbuf.st_atime, statbuf.st_mtime,
major (statbuf.st_rdev), minor (statbuf.st_rdev),
--
1.9.3
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