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Date: Thu, 1 Sep 2011 10:38:30 +0200 (CEST)
From: Lukas Czerner <lczerner@...hat.com>
To: Lukas Czerner <lczerner@...hat.com>
cc: linux-ext4@...r.kernel.org, tytso@....edu
Subject: Re: [PATCH] mke2fs: Use ext2fs_flush() only once
On Thu, 11 Aug 2011, Lukas Czerner wrote:
> On Fri, 29 Jul 2011, Lukas Czerner wrote:
>
> > We are doing ext2fs_flush() twice right now at the end of the mke2fs.
> > First by directly calling ext2fs_flush() which is intended to write
> > superblock and fs accounting information. And then it is invoked again
> > when we are calling ext2fs_close(), only this time, because the fs is
> > not dirty, we are writing out only superblock.
> >
> > I think it is bad to call it twice because even when writing only super
> > block it takes some time on bigger file systems and moreover
> > ext2fs_close() can fail without any reasonable explanation for the user.
> > Also ext2fs_flush() is printing out progress and it is confusing for the
> > users.
> >
> > Fix all this by removing the ext2fs_flush() and leaving it all to
> > ext2fs_close(). However we need to introduce new variables to store
> > check interval and max mount count, because fs structure is freed on
> > ext2fs_close() and we really want to print those information as the last
> > info for the user.
>
> Ping
Ping^2
>
> >
> > Signed-off-by: Lukas Czerner <lczerner@...hat.com>
> > ---
> > misc/mke2fs.c | 15 ++++++++-------
> > misc/tune2fs.c | 3 ++-
> > misc/util.c | 5 ++---
> > misc/util.h | 2 +-
> > tests/m_extent_journal/expect.1 | 2 +-
> > tests/m_uninit/expect.1 | 2 +-
> > 6 files changed, 15 insertions(+), 14 deletions(-)
> >
> > diff --git a/misc/mke2fs.c b/misc/mke2fs.c
> > index e062bda..481e550 100644
> > --- a/misc/mke2fs.c
> > +++ b/misc/mke2fs.c
> > @@ -2143,7 +2143,7 @@ int main (int argc, char *argv[])
> > ext2_filsys fs;
> > badblocks_list bb_list = 0;
> > unsigned int journal_blocks;
> > - unsigned int i;
> > + unsigned int i, max_mnt_count, checkinterval;
> > int val, hash_alg;
> > int flags;
> > int old_bitmaps;
> > @@ -2469,22 +2469,23 @@ no_journal:
> > if (!quiet)
> > printf(_("Writing superblocks and "
> > "filesystem accounting information: "));
> > - retval = ext2fs_flush(fs);
> > + checkinterval = fs->super->s_checkinterval;
> > + max_mnt_count = fs->super->s_max_mnt_count;
> > + retval = ext2fs_close(fs);
> > if (retval) {
> > fprintf(stderr,
> > _("\nWarning, had trouble writing out superblocks."));
> > - }
> > - if (!quiet) {
> > + } else if (!quiet) {
> > printf(_("done\n\n"));
> > if (!getenv("MKE2FS_SKIP_CHECK_MSG"))
> > - print_check_message(fs);
> > + print_check_message(max_mnt_count, checkinterval);
> > }
> > - val = ext2fs_close(fs);
> > +
> > remove_error_table(&et_ext2_error_table);
> > remove_error_table(&et_prof_error_table);
> > profile_release(profile);
> > for (i=0; fs_types[i]; i++)
> > free(fs_types[i]);
> > free(fs_types);
> > - return (retval || val) ? 1 : 0;
> > + return retval;
> > }
> > diff --git a/misc/tune2fs.c b/misc/tune2fs.c
> > index 5bf5187..0e1e1cf 100644
> > --- a/misc/tune2fs.c
> > +++ b/misc/tune2fs.c
> > @@ -568,7 +568,8 @@ static void add_journal(ext2_filsys fs)
> > if ((mount_flags & EXT2_MF_MOUNTED) == 0)
> > fs->flags &= ~EXT2_FLAG_SUPER_ONLY;
> > }
> > - print_check_message(fs);
> > + print_check_message(fs->super->s_max_mnt_count,
> > + fs->super->s_checkinterval);
> > return;
> >
> > err:
> > diff --git a/misc/util.c b/misc/util.c
> > index 51bdb60..18329ee 100644
> > --- a/misc/util.c
> > +++ b/misc/util.c
> > @@ -282,12 +282,11 @@ unsigned int figure_journal_size(int size, ext2_filsys fs)
> > return j_blocks;
> > }
> >
> > -void print_check_message(ext2_filsys fs)
> > +void print_check_message(unsigned int mnt, unsigned int check)
> > {
> > printf(_("This filesystem will be automatically "
> > "checked every %d mounts or\n"
> > "%g days, whichever comes first. "
> > "Use tune2fs -c or -i to override.\n"),
> > - fs->super->s_max_mnt_count,
> > - (double)fs->super->s_checkinterval / (3600 * 24));
> > + mnt, check / (3600 * 24));
> > }
> > diff --git a/misc/util.h b/misc/util.h
> > index e0c99f6..d05f17e 100644
> > --- a/misc/util.h
> > +++ b/misc/util.h
> > @@ -23,4 +23,4 @@ extern void check_plausibility(const char *device);
> > extern void parse_journal_opts(const char *opts);
> > extern void check_mount(const char *device, int force, const char *type);
> > extern unsigned int figure_journal_size(int size, ext2_filsys fs);
> > -extern void print_check_message(ext2_filsys fs);
> > +extern void print_check_message(unsigned int, unsigned int);
> > diff --git a/tests/m_extent_journal/expect.1 b/tests/m_extent_journal/expect.1
> > index 88ea2d9..a8c5b63 100644
> > --- a/tests/m_extent_journal/expect.1
> > +++ b/tests/m_extent_journal/expect.1
> > @@ -18,7 +18,7 @@ Writing inode tables: 0/8...1/8...2/8...3/8...4/8...5/8...6/8...7/8... ...done
> > Creating journal (4096 blocks): done
> > Writing superblocks and filesystem accounting information: 0/8...1/8...2/8...3/8...4/8...5/8...6/8...7/8... ...done
> >
> > -0/8...1/8...2/8...3/8...4/8...5/8...6/8...7/8... ...Filesystem features: has_journal ext_attr resize_inode dir_index filetype extent sparse_super
> > +Filesystem features: has_journal ext_attr resize_inode dir_index filetype extent sparse_super
> >
> > Pass 1: Checking inodes, blocks, and sizes
> > Pass 2: Checking directory structure
> > diff --git a/tests/m_uninit/expect.1 b/tests/m_uninit/expect.1
> > index 173c072..a3c059d 100644
> > --- a/tests/m_uninit/expect.1
> > +++ b/tests/m_uninit/expect.1
> > @@ -17,7 +17,7 @@ Allocating group tables: 0/16..... 1/16..... 2/16..... 3/16..... 4/16..... 5/16
> > Writing inode tables: 0/16..... 1/16..... 2/16..... 3/16..... 4/16..... 5/16..... 6/16..... 7/16..... 8/16..... 9/16.....10/16.....11/16.....12/16.....13/16.....14/16.....15/16..... .....done
> > Writing superblocks and filesystem accounting information: 0/16..... 1/16..... 2/16..... 3/16..... 4/16..... 5/16..... 6/16..... 7/16..... 8/16..... 9/16.....10/16.....11/16.....12/16.....13/16.....14/16.....15/16..... .....done
> >
> > - 0/16..... 1/16..... 2/16..... 3/16..... 4/16..... 5/16..... 6/16..... 7/16..... 8/16..... 9/16.....10/16.....11/16.....12/16.....13/16.....14/16.....15/16..... .....Filesystem features: ext_attr resize_inode dir_index filetype sparse_super uninit_bg
> > +Filesystem features: ext_attr resize_inode dir_index filetype sparse_super uninit_bg
> >
> > Pass 1: Checking inodes, blocks, and sizes
> > Pass 2: Checking directory structure
> >
>
>
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