On Mon, 5 May 2014, Theodore Ts'o wrote:
> Date: Mon, 5 May 2014 21:02:11 -0400
> From: Theodore Ts'o <tytso@xxxxxxx>
> To: Ext4 Developers List <linux-ext4@xxxxxxxxxxxxxxx>
> Cc: Theodore Ts'o <tytso@xxxxxxx>
> Subject: [PATCH -v2 1/3] mke2fs: print a message when creating a regular file
>
> We've added the ability to automatically recreate a file if it doesn't
> exist prior to creating the file system, since this is often used (for
> example) when managing file system images for use in virtual machines.
> We should at least notify the user that this is going on to avoid
> surprises in the case of misspelled device/file names.
Looks good, thanks!
Reviewed-by: Lukas Czerner <lczerner@xxxxxxxxxx>
>
> Signed-off-by: "Theodore Ts'o" <tytso@xxxxxxx>
> ---
> misc/mke2fs.c | 6 ++++--
> misc/util.c | 11 +++++++----
> misc/util.h | 1 +
> 3 files changed, 12 insertions(+), 6 deletions(-)
>
> diff --git a/misc/mke2fs.c b/misc/mke2fs.c
> index 2c51999..51532ef 100644
> --- a/misc/mke2fs.c
> +++ b/misc/mke2fs.c
> @@ -103,6 +103,7 @@ static int quotatype = -1; /* Initialize both user and group quotas by default
> static __u64 offset;
> static blk64_t journal_location = ~0LL;
> static int proceed_delay = -1;
> +static blk64_t dev_size;
>
> static struct ext2_super_block fs_param;
> static char *fs_uuid = NULL;
> @@ -1402,7 +1403,6 @@ static void PRS(int argc, char *argv[])
> char * extended_opts = 0;
> char * fs_type = 0;
> char * usage_types = 0;
> - blk64_t dev_size;
> /*
> * NOTE: A few words about fs_blocks_count and blocksize:
> *
> @@ -1768,6 +1768,8 @@ profile_error:
> flags = CREATE_FILE;
> if (isatty(0) && isatty(1))
> flags |= CHECK_FS_EXIST;
> + if (!quiet)
> + flags |= VERBOSE_CREATE;
> if (!check_plausibility(device_name, flags, &is_device) && !force)
> proceed_question(proceed_delay);
>
> @@ -2573,7 +2575,7 @@ int main (int argc, char *argv[])
> journal_blocks = figure_journal_size(journal_size, fs);
>
> /* Can't undo discard ... */
> - if (!noaction && discard && (io_ptr != undo_io_manager)) {
> + if (!noaction && discard && dev_size && (io_ptr != undo_io_manager)) {
> retval = mke2fs_discard_device(fs);
> if (!retval && io_channel_discard_zeroes_data(fs->io)) {
> if (verbose)
> diff --git a/misc/util.c b/misc/util.c
> index be16ebe..15b4ce5 100644
> --- a/misc/util.c
> +++ b/misc/util.c
> @@ -106,7 +106,7 @@ void proceed_question(int delay)
> }
>
> /*
> - * return 1 if the device looks plausible
> + * return 1 if the device looks plausible, creating the file if necessary
> */
> int check_plausibility(const char *device, int flags, int *ret_is_dev)
> {
> @@ -117,10 +117,13 @@ int check_plausibility(const char *device, int flags, int *ret_is_dev)
> char *fs_type = NULL;
> char *fs_label = NULL;
>
> - if (flags & CREATE_FILE)
> - fl |= O_CREAT;
> -
> fd = open(device, fl, 0666);
> + if ((fd < 0) && (errno == ENOENT) && (flags & CREATE_FILE)) {
> + fl |= O_CREAT;
> + fd = open(device, fl, 0666);
> + if (fd >= 0 && (flags & VERBOSE_CREATE))
> + printf(_("Creating regular file %s\n"), device);
> + }
> if (fd < 0) {
> fprintf(stderr, _("Could not open %s: %s\n"),
> device, error_message(errno));
> diff --git a/misc/util.h b/misc/util.h
> index 745568e..476164b 100644
> --- a/misc/util.h
> +++ b/misc/util.h
> @@ -21,6 +21,7 @@ extern char *journal_location_string;
> #define CHECK_BLOCK_DEV 0x0001
> #define CREATE_FILE 0x0002
> #define CHECK_FS_EXIST 0x0004
> +#define VERBOSE_CREATE 0x0008
>
> #ifndef HAVE_STRCASECMP
> extern int strcasecmp (char *s1, char *s2);
>
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