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Date: Wed, 11 May 2011 10:06:33 +0200 (CEST)
From: Lukas Czerner <lczerner@...hat.com>
To: Aditya Kali <adityakali@...gle.com>
cc: tytso@....edu, lczerner@...hat.com, linux-ext4@...r.kernel.org
Subject: Re: [PATCH v2] mke2fs: Allow specifying reserved_ratio via
mke2fs.conf
On Tue, 10 May 2011, Aditya Kali wrote:
> This patch adds support for specifying 'reserved_ratio' (percent blocks
> reserved for super user, same as '-m' command line option) in mke2fs.conf.
> It adds profile_get_double function in profile.c that allows reading
> floating point values from profile files.
The patch looks good, thanks!
-Lukas
>
> Signed-off-by: Aditya Kali <adityakali@...gle.com>
> ---
> e2fsck/profile.c | 37 +++++++++++++++++++++++++++++++++++++
> e2fsck/profile.h | 5 +++++
> misc/mke2fs.c | 26 +++++++++++++++++++++++++-
> misc/mke2fs.conf.5.in | 12 ++++++++++++
> tests/mke2fs.conf.in | 1 +
> 5 files changed, 80 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/misc/mke2fs.conf.5.in b/misc/mke2fs.conf.5.in
> index 2e8b585..0136e39 100644
> --- a/misc/mke2fs.conf.5.in
> +++ b/misc/mke2fs.conf.5.in
> @@ -168,6 +168,13 @@ specify one on the command line, and the filesystem-type
> specific section of the configuration file does not specify a default
> inode size.
> .TP
> +.I reserved_ratio
> +This relation specifies the default percentage of filesystem blocks
> +reserved for the super-user, if the user does not
> +specify one on the command line, and the filesystem-type
> +specific section of the configuration file does not specify a default
> +reserved ratio. This value can be a floating point number.
> +.TP
> .I undo_dir
> This relation specifies the directory where the undo file should be
> stored. It can be overridden via the
> @@ -353,6 +360,11 @@ specify one on the command line.
> This relation specifies the default inode size if the user does not
> specify one on the command line.
> .TP
> +.I reserved_ratio
> +This relation specifies the default percentage of filesystem blocks
> +reserved for the super-user, if the user does not specify one on the command
> +line.
> +.TP
> .I hash_alg
> This relation specifies the default hash algorithm used for the
> new filesystems with hashed b-tree directories. Valid algorithms
> 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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