int au_xigen_inc(struct inode *inode)
{
int err;
loff_t pos;
ssize_t sz;
__u32 igen;
struct super_block *sb;
struct au_sbinfo *sbinfo;
LKTRTrace("i%lu\n", (unsigned long)inode->i_ino);
err = 0;
sb = inode->i_sb;
if (unlikely(!au_opt_test_xino(au_mntflags(sb))))
goto out;
pos = inode->i_ino;
pos *= sizeof(igen);
igen = inode->i_generation + 1;
sbinfo = au_sbi(sb);
sz = xino_fwrite(sbinfo->si_xwrite, sbinfo->si_xigen, &igen,
sizeof(igen), &pos);
if (sz == sizeof(igen))
goto out; /* success */
err = sz;
if (unlikely(sz >= 0)) {
err = -EIO;
AuIOErr("xigen error (%zd)\n", sz);
}
out:
AuTraceErr(err);
return err;
}
int au_xigen_new(struct inode *inode)
{
int err;
loff_t pos;
ssize_t sz;
struct super_block *sb;
struct au_sbinfo *sbinfo;
struct file *file;
LKTRTrace("i%lu\n", inode->i_ino);
err = 0;
/* todo: dirty, at mount time */
if (inode->i_ino == AUFS_ROOT_INO)
goto out;
sb = inode->i_sb;
if (unlikely(!au_opt_test_xino(au_mntflags(sb))))
goto out;
err = -EFBIG;
pos = inode->i_ino;
if (unlikely(Au_LOFF_MAX / sizeof(inode->i_generation) - 1 < pos)) {
AuIOErr1("too large i%lld\n", pos);
goto out;
}
pos *= sizeof(inode->i_generation);
err = 0;
sbinfo = au_sbi(sb);
file = sbinfo->si_xigen;
BUG_ON(!file);
if (i_size_read(file->f_dentry->d_inode)
< pos + sizeof(inode->i_generation)) {
inode->i_generation = atomic_inc_return(&sbinfo->si_xigen_next);
sz = xino_fwrite(sbinfo->si_xwrite, file, &inode->i_generation,
sizeof(inode->i_generation), &pos);
} else
sz = xino_fread(sbinfo->si_xread, file, &inode->i_generation,
sizeof(inode->i_generation), &pos);
if (sz == sizeof(inode->i_generation))
goto out; /* success */
err = sz;
if (unlikely(sz >= 0)) {
err = -EIO;
AuIOErr("xigen error (%zd)\n", sz);
}
out:
AuTraceErr(err);
return err;
}
void au_xigen_inc(struct inode *inode)
{
loff_t pos;
ssize_t sz;
__u32 igen;
struct super_block *sb;
struct au_sbinfo *sbinfo;
sb = inode->i_sb;
AuDebugOn(!au_opt_test(au_mntflags(sb), XINO));
sbinfo = au_sbi(sb);
pos = inode->i_ino;
pos *= sizeof(igen);
igen = inode->i_generation + 1;
sz = xino_fwrite(sbinfo->si_xwrite, sbinfo->si_xigen, &igen,
sizeof(igen), &pos);
if (sz == sizeof(igen))
return; /* success */
if (unlikely(sz >= 0))
AuIOErr("xigen error (%zd)\n", sz);
}
