| Message ID | 1407937043-23186-1-git-send-email-chintzung@gmail.com |
|---|---|
| State | New, archived |
| Headers | show |
On Wed, Aug 13, 2014 at 09:37:23PM +0800, Chin-Tsung Cheng wrote: > The journal blocks of external journal device should not > be counted as overhead. > > Signed-off-by: Chin-Tsung Cheng <chintzung@gmail.com> > --- > fs/ext4/super.c | 7 ++++--- > 1 file changed, 4 insertions(+), 3 deletions(-) > > diff --git a/fs/ext4/super.c b/fs/ext4/super.c > index 32b43ad..03b2f62 100644 > --- a/fs/ext4/super.c > +++ b/fs/ext4/super.c > @@ -3316,9 +3316,10 @@ int ext4_calculate_overhead(struct super_block *sb) > memset(buf, 0, PAGE_SIZE); > cond_resched(); > } > - /* Add the journal blocks as well */ > - if (sbi->s_journal) > - overhead += EXT4_NUM_B2C(sbi, sbi->s_journal->j_maxlen); > + /* Add the internal journal blocks as well */ > + if ((sbi->s_journal) && > + (sbi->s_journal->j_fs_dev == sbi->s_journal->j_dev)) > + overhead += EXT4_NUM_B2C(sbi, sbi->s_journal->j_maxlen); I think you have some whitespace issues here, but otherwise this seems ok. External journals aren't counted towards the total blocks count, correct? --D > > sbi->s_overhead = overhead; > smp_wmb(); > -- > 1.9.3 > > -- > To unsubscribe from this list: send the line "unsubscribe linux-ext4" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On 8/13/14, 6:37 AM, Chin-Tsung Cheng wrote: > The journal blocks of external journal device should not > be counted as overhead. > > Signed-off-by: Chin-Tsung Cheng <chintzung@gmail.com> Yep, I added this and didn't consider external journals, oops. Agree with Darrick that whitespace (and parens) aren't ideal... Is this a shorter test? if (sbi->s_journal && !sbi->journal_bdev) { overhead += EXT4_NUM_B2C(sbi, sbi->s_journal->j_maxlen); *sbi gets kzalloced and I *think* journal_bdev is only filled in for external journals... ext3_statfs probably needs the same treatment, it unconditionally does: /* Add the journal blocks as well */ overhead += sbi->s_journal->j_maxlen; -Eric > --- > fs/ext4/super.c | 7 ++++--- > 1 file changed, 4 insertions(+), 3 deletions(-) > > diff --git a/fs/ext4/super.c b/fs/ext4/super.c > index 32b43ad..03b2f62 100644 > --- a/fs/ext4/super.c > +++ b/fs/ext4/super.c > @@ -3316,9 +3316,10 @@ int ext4_calculate_overhead(struct super_block *sb) > memset(buf, 0, PAGE_SIZE); > cond_resched(); > } > - /* Add the journal blocks as well */ > - if (sbi->s_journal) > - overhead += EXT4_NUM_B2C(sbi, sbi->s_journal->j_maxlen); > + /* Add the internal journal blocks as well */ > + if ((sbi->s_journal) && > + (sbi->s_journal->j_fs_dev == sbi->s_journal->j_dev)) > + overhead += EXT4_NUM_B2C(sbi, sbi->s_journal->j_maxlen); > > sbi->s_overhead = overhead; > smp_wmb(); > -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
2014-08-14 11:21 GMT+08:00 Eric Sandeen <sandeen@redhat.com>: > On 8/13/14, 6:37 AM, Chin-Tsung Cheng wrote: >> The journal blocks of external journal device should not >> be counted as overhead. >> >> Signed-off-by: Chin-Tsung Cheng <chintzung@gmail.com> > > Yep, I added this and didn't consider external journals, oops. > > Agree with Darrick that whitespace (and parens) aren't ideal... > OK. I will fix it. > Is this a shorter test? > > if (sbi->s_journal && !sbi->journal_bdev) { > overhead += EXT4_NUM_B2C(sbi, sbi->s_journal->j_maxlen); > > > *sbi gets kzalloced and I *think* journal_bdev is only filled in for > external journals... Yes, journal_bdev is only filled in ext4_get_dev_journal() function for external journal device. > > ext3_statfs probably needs the same treatment, it unconditionally does: > > > /* Add the journal blocks as well */ > overhead += sbi->s_journal->j_maxlen; > Yes, it also miscalculates the number of file system overhead blocks for external journal device. This causes the f_blocks field in the statfs structure to be smaller than it should be. This would cause the "df" output to show the number of data blocks in the file system smaller than they should be, and the number of used blocks might be negative. > -Eric > >> --- >> fs/ext4/super.c | 7 ++++--- >> 1 file changed, 4 insertions(+), 3 deletions(-) >> >> diff --git a/fs/ext4/super.c b/fs/ext4/super.c >> index 32b43ad..03b2f62 100644 >> --- a/fs/ext4/super.c >> +++ b/fs/ext4/super.c >> @@ -3316,9 +3316,10 @@ int ext4_calculate_overhead(struct super_block *sb) >> memset(buf, 0, PAGE_SIZE); >> cond_resched(); >> } >> - /* Add the journal blocks as well */ >> - if (sbi->s_journal) >> - overhead += EXT4_NUM_B2C(sbi, sbi->s_journal->j_maxlen); >> + /* Add the internal journal blocks as well */ >> + if ((sbi->s_journal) && >> + (sbi->s_journal->j_fs_dev == sbi->s_journal->j_dev)) >> + overhead += EXT4_NUM_B2C(sbi, sbi->s_journal->j_maxlen); >> >> sbi->s_overhead = overhead; >> smp_wmb(); >> > -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/fs/ext4/super.c b/fs/ext4/super.c index 32b43ad..03b2f62 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -3316,9 +3316,10 @@ int ext4_calculate_overhead(struct super_block *sb) memset(buf, 0, PAGE_SIZE); cond_resched(); } - /* Add the journal blocks as well */ - if (sbi->s_journal) - overhead += EXT4_NUM_B2C(sbi, sbi->s_journal->j_maxlen); + /* Add the internal journal blocks as well */ + if ((sbi->s_journal) && + (sbi->s_journal->j_fs_dev == sbi->s_journal->j_dev)) + overhead += EXT4_NUM_B2C(sbi, sbi->s_journal->j_maxlen); sbi->s_overhead = overhead; smp_wmb();
The journal blocks of external journal device should not be counted as overhead. Signed-off-by: Chin-Tsung Cheng <chintzung@gmail.com> --- fs/ext4/super.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-)