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Date: Tue, 10 May 2011 20:01:08 +0200 (CEST)
From: Lukas Czerner <lczerner@...hat.com>
To: Aditya Kali <adityakali@...gle.com>
cc: tytso@....edu, linux-ext4@...r.kernel.org
Subject: Re: [PATCH] mke2fs: Support floating point values in mke2fs.conf
On Tue, 10 May 2011, Aditya Kali wrote:
> This patch adds profile_get_double function in profile.c that allows reading
> floating point values from profile files. The floating point support is used
> to read reserved_ratio (reserved for super user block percentage) from
> mke2fs.conf.
Hi Aditya,
thanks for the patch, however I have couple of comments. First of all
the commit subject does not really reflect the change, because the point
of this commit is not to teach e2fsprogs to be able to read double from
profile but rather add new option to mke2fs.conf for specifying
super-user reservation ratio. I am sorry it this seems like nitpicking,
but it is really useful to be able to at least guess what the commit
does from its subject.
Also it would be nice to have this option described in the mke2fs
manual page as well.
Thanks!
-Lukas
>
> Signed-off-by: Aditya Kali <adityakali@...gle.com>
> ---
> e2fsck/profile.c | 37 +++++++++++++++++++++++++++++++++++++
> e2fsck/profile.h | 5 +++++
> misc/mke2fs.c | 26 +++++++++++++++++++++++++-
> tests/mke2fs.conf.in | 1 +
> 4 files changed, 68 insertions(+), 1 deletions(-)
>
> diff --git a/e2fsck/profile.c b/e2fsck/profile.c
> index 5e9dc53..327bfb4 100644
> --- a/e2fsck/profile.c
> +++ b/e2fsck/profile.c
> @@ -1596,6 +1596,43 @@ profile_get_uint(profile_t profile, const char *name, const char *subname,
> return 0;
> }
>
> +errcode_t
> +profile_get_double(profile_t profile, const char *name, const char *subname,
> + const char *subsubname, double def_val, double *ret_double)
> +{
> + const char *value;
> + errcode_t retval;
> + char *end_value;
> + double double_val;
> +
> + *ret_double = def_val;
> + if (profile == 0)
> + return 0;
> +
> + retval = profile_get_value(profile, name, subname, subsubname, &value);
> + if (retval == PROF_NO_SECTION || retval == PROF_NO_RELATION) {
> + *ret_double = def_val;
> + return 0;
> + } else if (retval)
> + return retval;
> +
> + if (value[0] == 0)
> + /* Empty string is no good. */
> + return PROF_BAD_INTEGER;
> + errno = 0;
> + double_val = strtod(value, &end_value);
> +
> + /* Overflow or underflow. */
> + if (errno != 0)
> + return PROF_BAD_INTEGER;
> + /* Garbage in string. */
> + if (end_value != value + strlen(value))
> + return PROF_BAD_INTEGER;
> +
> + *ret_double = double_val;
> + return 0;
> +}
> +
> static const char *const conf_yes[] = {
> "y", "yes", "true", "t", "1", "on",
> 0,
> diff --git a/e2fsck/profile.h b/e2fsck/profile.h
> index 0c17732..4cc10eb 100644
> --- a/e2fsck/profile.h
> +++ b/e2fsck/profile.h
> @@ -78,6 +78,11 @@ long profile_get_uint
> const char *subsubname, unsigned int def_val,
> unsigned int *ret_int);
>
> +long profile_get_double
> + (profile_t profile, const char *name, const char *subname,
> + const char *subsubname, double def_val,
> + double *ret_float);
> +
> long profile_get_boolean
> (profile_t profile, const char *name, const char *subname,
> const char *subsubname, int def_val,
> diff --git a/misc/mke2fs.c b/misc/mke2fs.c
> index 23f8c10..313423b 100644
> --- a/misc/mke2fs.c
> +++ b/misc/mke2fs.c
> @@ -1072,6 +1072,18 @@ static int get_int_from_profile(char **fs_types, const char *opt, int def_val)
> return ret;
> }
>
> +static double get_double_from_profile(char **fs_types, const char *opt,
> + double def_val)
> +{
> + double ret;
> + char **cpp;
> +
> + profile_get_double(profile, "defaults", opt, 0, def_val, &ret);
> + for (cpp = fs_types; *cpp; cpp++)
> + profile_get_double(profile, "fs_types", *cpp, opt, ret, &ret);
> + return ret;
> +}
> +
> static int get_bool_from_profile(char **fs_types, const char *opt, int def_val)
> {
> int ret;
> @@ -1144,7 +1156,7 @@ static void PRS(int argc, char *argv[])
> int inode_ratio = 0;
> int inode_size = 0;
> unsigned long flex_bg_size = 0;
> - double reserved_ratio = 5.0;
> + double reserved_ratio = -1.0;
> int lsector_size = 0, psector_size = 0;
> int show_version_only = 0;
> unsigned long long num_inodes = 0; /* unsigned long long to catch too-large input */
> @@ -1667,6 +1679,18 @@ profile_error:
> EXT3_FEATURE_COMPAT_HAS_JOURNAL;
> }
>
> + /* Get reserved_ratio from profile if not specified on cmd line. */
> + if (reserved_ratio < 0.0) {
> + reserved_ratio = get_double_from_profile(
> + fs_types, "reserved_ratio", 5.0);
> + if (reserved_ratio > 50 || reserved_ratio < 0) {
> + com_err(program_name, 0,
> + _("invalid reserved blocks percent - %lf"),
> + reserved_ratio);
> + exit(1);
> + }
> + }
> +
> if (fs_param.s_feature_incompat &
> EXT3_FEATURE_INCOMPAT_JOURNAL_DEV) {
> reserved_ratio = 0;
> diff --git a/tests/mke2fs.conf.in b/tests/mke2fs.conf.in
> index 070d5d5..fbe2e2a 100644
> --- a/tests/mke2fs.conf.in
> +++ b/tests/mke2fs.conf.in
> @@ -3,6 +3,7 @@
> blocksize = 4096
> inode_size = 256
> inode_ratio = 16384
> + reserved_ratio = 5.0
> enable_periodic_fsck = true
> lazy_itable_init = false
> default_mntopts = ^acl
>
--
--
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