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nilfs2: super root size should change depending on inode size

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The size of super root structure depends on inode size, so
NILFS_SR_BYTES macro should be a function of the inode size.  This
fixes the issue.

Even though a different size value will be written for a possible
future filesystem with extended inode, but fortunately this does not
break disk format compatibility.

Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
This commit is contained in:
Ryusuke Konishi 2011-04-30 18:56:12 +09:00
parent 1cb2d38cb3
commit 6c6de1aa65
3 changed files with 6 additions and 3 deletions
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5
fs/nilfs2/segbuf.c
View File

@ -239,12 +239,15 @@ nilfs_segbuf_fill_in_super_root_crc(struct nilfs_segment_buffer *segbuf,
u32 seed)
{
struct nilfs_super_root *raw_sr;
struct the_nilfs *nilfs = segbuf->sb_super->s_fs_info;
unsigned srsize;
u32 crc;
raw_sr = (struct nilfs_super_root *)segbuf->sb_super_root->b_data;
srsize = NILFS_SR_BYTES(nilfs->ns_inode_size);
crc = crc32_le(seed,
(unsigned char *)raw_sr + sizeof(raw_sr->sr_sum),
NILFS_SR_BYTES - sizeof(raw_sr->sr_sum));
srsize - sizeof(raw_sr->sr_sum));
raw_sr->sr_sum = cpu_to_le32(crc);
}

2
fs/nilfs2/segment.c
View File

@ -894,7 +894,7 @@ static void nilfs_segctor_fill_in_super_root(struct nilfs_sc_info *sci,
bh_sr = NILFS_LAST_SEGBUF(&sci->sc_segbufs)->sb_super_root;
raw_sr = (struct nilfs_super_root *)bh_sr->b_data;
raw_sr->sr_bytes = cpu_to_le16(NILFS_SR_BYTES);
raw_sr->sr_bytes = cpu_to_le16(NILFS_SR_BYTES(isz));
raw_sr->sr_nongc_ctime
= cpu_to_le64(nilfs_doing_gc() ?
nilfs->ns_nongc_ctime : sci->sc_seg_ctime);

2
include/linux/nilfs2_fs.h
View File

@ -107,7 +107,7 @@ struct nilfs_super_root {
#define NILFS_SR_DAT_OFFSET(inode_size) NILFS_SR_MDT_OFFSET(inode_size, 0)
#define NILFS_SR_CPFILE_OFFSET(inode_size) NILFS_SR_MDT_OFFSET(inode_size, 1)
#define NILFS_SR_SUFILE_OFFSET(inode_size) NILFS_SR_MDT_OFFSET(inode_size, 2)
#define NILFS_SR_BYTES (sizeof(struct nilfs_super_root))
#define NILFS_SR_BYTES(inode_size) NILFS_SR_MDT_OFFSET(inode_size, 3)
/*
* Maximal mount counts