diff options
| -rw-r--r-- | fs/ext2/super.c | 20 | ||||
| -rw-r--r-- | include/linux/ext2_fs_sb.h | 2 |
2 files changed, 16 insertions, 6 deletions
diff --git a/fs/ext2/super.c b/fs/ext2/super.c index 5de5061eb33..b2efd9083b9 100644 --- a/fs/ext2/super.c +++ b/fs/ext2/super.c @@ -1099,15 +1099,18 @@ static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf) struct super_block *sb = dentry->d_sb; struct ext2_sb_info *sbi = EXT2_SB(sb); struct ext2_super_block *es = sbi->s_es; - unsigned long overhead; - int i; u64 fsid; if (test_opt (sb, MINIX_DF)) - overhead = 0; - else { + sbi->s_overhead_last = 0; + else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) { + unsigned long i, overhead = 0; + smp_rmb(); + /* - * Compute the overhead (FS structures) + * Compute the overhead (FS structures). This is constant + * for a given filesystem unless the number of block groups + * changes so we cache the previous value until it does. */ /* @@ -1131,17 +1134,22 @@ static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf) */ overhead += (sbi->s_groups_count * (2 + sbi->s_itb_per_group)); + sbi->s_overhead_last = overhead; + smp_wmb(); + sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count); } buf->f_type = EXT2_SUPER_MAGIC; buf->f_bsize = sb->s_blocksize; - buf->f_blocks = le32_to_cpu(es->s_blocks_count) - overhead; + buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last; buf->f_bfree = ext2_count_free_blocks(sb); + es->s_free_blocks_count = cpu_to_le32(buf->f_bfree); buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count); if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count)) buf->f_bavail = 0; buf->f_files = le32_to_cpu(es->s_inodes_count); buf->f_ffree = ext2_count_free_inodes(sb); + es->s_free_inodes_count = cpu_to_le32(buf->f_ffree); buf->f_namelen = EXT2_NAME_LEN; fsid = le64_to_cpup((void *)es->s_uuid) ^ le64_to_cpup((void *)es->s_uuid + sizeof(u64)); diff --git a/include/linux/ext2_fs_sb.h b/include/linux/ext2_fs_sb.h index 4eda0ed76a4..d149f2959e6 100644 --- a/include/linux/ext2_fs_sb.h +++ b/include/linux/ext2_fs_sb.h @@ -33,6 +33,8 @@ struct ext2_sb_info { unsigned long s_gdb_count; /* Number of group descriptor blocks */ unsigned long s_desc_per_block; /* Number of group descriptors per block */ unsigned long s_groups_count; /* Number of groups in the fs */ + unsigned long s_overhead_last; /* Last calculated overhead */ + unsigned long s_blocks_last; /* Last seen block count */ struct buffer_head * s_sbh; /* Buffer containing the super block */ struct ext2_super_block * s_es; /* Pointer to the super block in the buffer */ struct buffer_head ** s_group_desc; |