diff options
| author | Eric Whitney <enwlinux@gmail.com> | 2016-09-30 09:08:49 +0300 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2016-09-30 09:08:49 +0300 |
| commit | 3c816ded78bbd645d61ee36f461deb8376d3723a (patch) | |
| tree | e530f2987e80d353f8aeab7c3737a00ff9672fcb | |
| parent | c6cb7e776ad59feba5d84b2524efd6dcbc618e42 (diff) | |
| download | linux-3c816ded78bbd645d61ee36f461deb8376d3723a.tar.xz | |
ext4: use journal inode to determine journal overhead
When a file system contains an internal journal that has not been
loaded, use the journal inode's i_size field to determine its
contribution to the file system's overhead. (The journal's j_maxlen
field is normally used to determine its size, but it's unavailable when
the journal has not been loaded.)
Signed-off-by: Eric Whitney <enwlinux@gmail.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
| -rw-r--r-- | fs/ext4/super.c | 19 |
1 files changed, 17 insertions, 2 deletions
diff --git a/fs/ext4/super.c b/fs/ext4/super.c index 056ca1bea2ac..6db81fbcbaa6 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -3210,6 +3210,8 @@ int ext4_calculate_overhead(struct super_block *sb) { struct ext4_sb_info *sbi = EXT4_SB(sb); struct ext4_super_block *es = sbi->s_es; + struct inode *j_inode; + unsigned int j_blocks, j_inum = le32_to_cpu(es->s_journal_inum); ext4_group_t i, ngroups = ext4_get_groups_count(sb); ext4_fsblk_t overhead = 0; char *buf = (char *) get_zeroed_page(GFP_NOFS); @@ -3240,10 +3242,23 @@ int ext4_calculate_overhead(struct super_block *sb) memset(buf, 0, PAGE_SIZE); cond_resched(); } - /* Add the internal journal blocks as well */ + + /* + * Add the internal journal blocks whether the journal has been + * loaded or not + */ if (sbi->s_journal && !sbi->journal_bdev) overhead += EXT4_NUM_B2C(sbi, sbi->s_journal->j_maxlen); - + else if (ext4_has_feature_journal(sb) && !sbi->s_journal) { + j_inode = ext4_get_journal_inode(sb, j_inum); + if (j_inode) { + j_blocks = j_inode->i_size >> sb->s_blocksize_bits; + overhead += EXT4_NUM_B2C(sbi, j_blocks); + iput(j_inode); + } else { + ext4_msg(sb, KERN_ERR, "can't get journal size"); + } + } sbi->s_overhead = overhead; smp_wmb(); free_page((unsigned long) buf); |