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author | Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> | 2011-05-05 01:23:57 +0900 |
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committer | Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> | 2011-05-10 22:21:45 +0900 |
commit | cfb0a4bfd8736418cbe5cbc115cabc84b527111e (patch) | |
tree | 9faf66ad535fea01e19bc3f7bf59fe8fd75d8082 | |
parent | 619205da5b567504310daf829dede1187fa29bbc (diff) | |
download | linux-stable-cfb0a4bfd8736418cbe5cbc115cabc84b527111e.tar.gz linux-stable-cfb0a4bfd8736418cbe5cbc115cabc84b527111e.tar.bz2 linux-stable-cfb0a4bfd8736418cbe5cbc115cabc84b527111e.zip |
nilfs2: add routine to move secondary super block
After resizing the filesystem, the secondary super block must be moved
to a new location. This adds a helper function for this.
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
-rw-r--r-- | fs/nilfs2/super.c | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/fs/nilfs2/super.c b/fs/nilfs2/super.c index 062cca065195..eba5b53b1080 100644 --- a/fs/nilfs2/super.c +++ b/fs/nilfs2/super.c @@ -347,6 +347,63 @@ int nilfs_cleanup_super(struct super_block *sb) return ret; } +/** + * nilfs_move_2nd_super - relocate secondary super block + * @sb: super block instance + * @sb2off: new offset of the secondary super block (in bytes) + */ +static int nilfs_move_2nd_super(struct super_block *sb, loff_t sb2off) +{ + struct the_nilfs *nilfs = sb->s_fs_info; + struct buffer_head *nsbh; + struct nilfs_super_block *nsbp; + sector_t blocknr, newblocknr; + unsigned long offset; + int sb2i = -1; /* array index of the secondary superblock */ + int ret = 0; + + /* nilfs->ns_sem must be locked by the caller. */ + if (nilfs->ns_sbh[1] && + nilfs->ns_sbh[1]->b_blocknr > nilfs->ns_first_data_block) { + sb2i = 1; + blocknr = nilfs->ns_sbh[1]->b_blocknr; + } else if (nilfs->ns_sbh[0]->b_blocknr > nilfs->ns_first_data_block) { + sb2i = 0; + blocknr = nilfs->ns_sbh[0]->b_blocknr; + } + if (sb2i >= 0 && (u64)blocknr << nilfs->ns_blocksize_bits == sb2off) + goto out; /* super block location is unchanged */ + + /* Get new super block buffer */ + newblocknr = sb2off >> nilfs->ns_blocksize_bits; + offset = sb2off & (nilfs->ns_blocksize - 1); + nsbh = sb_getblk(sb, newblocknr); + if (!nsbh) { + printk(KERN_WARNING + "NILFS warning: unable to move secondary superblock " + "to block %llu\n", (unsigned long long)newblocknr); + ret = -EIO; + goto out; + } + nsbp = (void *)nsbh->b_data + offset; + memset(nsbp, 0, nilfs->ns_blocksize); + + if (sb2i >= 0) { + memcpy(nsbp, nilfs->ns_sbp[sb2i], nilfs->ns_sbsize); + brelse(nilfs->ns_sbh[sb2i]); + nilfs->ns_sbh[sb2i] = nsbh; + nilfs->ns_sbp[sb2i] = nsbp; + } else if (nilfs->ns_sbh[0]->b_blocknr < nilfs->ns_first_data_block) { + /* secondary super block will be restored to index 1 */ + nilfs->ns_sbh[1] = nsbh; + nilfs->ns_sbp[1] = nsbp; + } else { + brelse(nsbh); + } +out: + return ret; +} + static void nilfs_put_super(struct super_block *sb) { struct the_nilfs *nilfs = sb->s_fs_info; |