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Date: Wed, 01 Apr 2015 19:35:26 -0700
From: "Darrick J. Wong" <darrick.wong@...cle.com>
To: tytso@....edu, darrick.wong@...cle.com
Cc: linux-ext4@...r.kernel.org
Subject: [PATCH 13/35] e2undo: fix memory leaks and tweak the error messages
somewhat
Fix memory leaks and improve the error messages to make it easier
to figure out why e2undo went wrong.
Signed-off-by: Darrick J. Wong <darrick.wong@...cle.com>
---
misc/e2undo.c | 43 ++++++++++++++++++++++++-------------------
1 file changed, 24 insertions(+), 19 deletions(-)
diff --git a/misc/e2undo.c b/misc/e2undo.c
index a43c26f..d828d3b 100644
--- a/misc/e2undo.c
+++ b/misc/e2undo.c
@@ -49,7 +49,7 @@ static int check_filesystem(TDB_CONTEXT *tdb, io_channel channel)
retval = io_channel_read_blk64(channel, 1, -SUPERBLOCK_SIZE, &super);
if (retval) {
com_err(prg_name, retval,
- "%s", _("Failed to read the file system data \n"));
+ "%s", _("while reading filesystem superblock."));
return retval;
}
@@ -58,16 +58,16 @@ static int check_filesystem(TDB_CONTEXT *tdb, io_channel channel)
tdb_data = tdb_fetch(tdb, tdb_key);
if (!tdb_data.dptr) {
retval = EXT2_ET_TDB_SUCCESS + tdb_error(tdb);
- com_err(prg_name, retval,
- _("Failed tdb_fetch %s\n"), tdb_errorstr(tdb));
+ com_err(prg_name, retval, "%s",
+ _("while fetching last mount time."));
return retval;
}
s_mtime = *(__u32 *)tdb_data.dptr;
+ free(tdb_data.dptr);
if (super.s_mtime != s_mtime) {
-
com_err(prg_name, 0,
- _("The file system Mount time didn't match %u\n"),
+ _("The filesystem last mount time didn't match %u."),
s_mtime);
return -1;
@@ -79,14 +79,14 @@ static int check_filesystem(TDB_CONTEXT *tdb, io_channel channel)
tdb_data = tdb_fetch(tdb, tdb_key);
if (!tdb_data.dptr) {
retval = EXT2_ET_TDB_SUCCESS + tdb_error(tdb);
- com_err(prg_name, retval,
- _("Failed tdb_fetch %s\n"), tdb_errorstr(tdb));
+ com_err(prg_name, retval, "%s", _("while fetching UUID"));
return retval;
}
memcpy(s_uuid, tdb_data.dptr, sizeof(s_uuid));
+ free(tdb_data.dptr);
if (memcmp(s_uuid, super.s_uuid, sizeof(s_uuid))) {
com_err(prg_name, 0, "%s",
- _("The file system UUID didn't match \n"));
+ _("The filesystem UUID didn't match."));
return -1;
}
@@ -104,12 +104,12 @@ static int set_blk_size(TDB_CONTEXT *tdb, io_channel channel)
tdb_data = tdb_fetch(tdb, tdb_key);
if (!tdb_data.dptr) {
retval = EXT2_ET_TDB_SUCCESS + tdb_error(tdb);
- com_err(prg_name, retval,
- _("Failed tdb_fetch %s\n"), tdb_errorstr(tdb));
+ com_err(prg_name, retval, "%s", _("while fetching block size"));
return retval;
}
block_size = *(int *)tdb_data.dptr;
+ free(tdb_data.dptr);
#ifdef DEBUG
printf("Block size %d\n", block_size);
#endif
@@ -129,6 +129,7 @@ int main(int argc, char *argv[])
blk64_t blk_num;
char *device_name, *tdb_file;
io_manager manager = unix_io_manager;
+ void *old_dptr = NULL;
#ifdef ENABLE_NLS
setlocale(LC_MESSAGES, "");
@@ -160,20 +161,20 @@ int main(int argc, char *argv[])
if (!tdb) {
com_err(prg_name, errno,
- _("Failed tdb_open %s\n"), tdb_file);
+ _("while opening undo file `%s'\n"), tdb_file);
exit(1);
}
retval = ext2fs_check_if_mounted(device_name, &mount_flags);
if (retval) {
com_err(prg_name, retval, _("Error while determining whether "
- "%s is mounted.\n"), device_name);
+ "%s is mounted."), device_name);
exit(1);
}
if (mount_flags & EXT2_MF_MOUNTED) {
com_err(prg_name, retval, "%s", _("e2undo should only be run "
- "on unmounted file system\n"));
+ "on unmounted filesystems"));
exit(1);
}
@@ -181,7 +182,7 @@ int main(int argc, char *argv[])
IO_FLAG_EXCLUSIVE | IO_FLAG_RW, &channel);
if (retval) {
com_err(prg_name, retval,
- _("Failed to open %s\n"), device_name);
+ _("while opening `%s'"), device_name);
exit(1);
}
@@ -194,30 +195,34 @@ int main(int argc, char *argv[])
}
for (key = tdb_firstkey(tdb); key.dptr; key = tdb_nextkey(tdb, key)) {
+ free(old_dptr);
+ old_dptr = key.dptr;
if (!strcmp((char *) key.dptr, (char *) mtime_key) ||
!strcmp((char *) key.dptr, (char *) uuid_key) ||
!strcmp((char *) key.dptr, (char *) blksize_key)) {
continue;
}
+ blk_num = *(blk64_t *)key.dptr;
data = tdb_fetch(tdb, key);
if (!data.dptr) {
- com_err(prg_name, 0,
- _("Failed tdb_fetch %s\n"), tdb_errorstr(tdb));
+ retval = EXT2_ET_TDB_SUCCESS + tdb_error(tdb);
+ com_err(prg_name, retval,
+ _("while fetching block %llu."), blk_num);
exit(1);
}
- blk_num = *(blk64_t *)key.dptr;
printf(_("Replayed transaction of size %zd at location %llu\n"),
data.dsize, blk_num);
retval = io_channel_write_blk64(channel, blk_num,
-data.dsize, data.dptr);
+ free(data.dptr);
if (retval == -1) {
com_err(prg_name, retval,
- _("Failed write %s\n"),
- strerror(errno));
+ _("while writing block %llu."), blk_num);
exit(1);
}
}
+ free(old_dptr);
io_channel_close(channel);
tdb_close(tdb);
--
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