/*
* copy-down the file and unlink the bsrc file.
* - unlink the bdst whout if exist
* - copy-down the file (with whtmp name and rename)
* - unlink the bsrc file
*/
static int au_do_mvdown(const unsigned char dmsg, struct au_mvd_args *a)
{
int err;
err = au_do_mkdir(dmsg, a);
if (!err)
err = au_do_lock(dmsg, a);
if (unlikely(err))
goto out;
/*
* do not revert the activities we made on bdst since they should be
* harmless in aufs.
*/
err = au_do_cpdown(dmsg, a);
if (!err)
err = au_do_unlink_wh(dmsg, a);
if (!err && !(a->mvdown.flags & AUFS_MVDOWN_KUPPER))
err = au_do_unlink(dmsg, a);
if (unlikely(err))
goto out_unlock;
AuDbg("%pd2, 0x%x, %d --> %d\n",
a->dentry, a->mvdown.flags, a->mvd_bsrc, a->mvd_bdst);
if (find_lower_writable(a) < 0)
a->mvdown.flags |= AUFS_MVDOWN_BOTTOM;
if (a->mvdown.flags & AUFS_MVDOWN_STFS)
au_do_stfs(dmsg, a);
/* maintain internal array */
if (!(a->mvdown.flags & AUFS_MVDOWN_KUPPER)) {
au_set_h_dptr(a->dentry, a->mvd_bsrc, NULL);
au_set_dbtop(a->dentry, a->mvd_bdst);
au_set_h_iptr(a->inode, a->mvd_bsrc, NULL, /*flags*/0);
au_set_ibtop(a->inode, a->mvd_bdst);
} else {
/* hide the lower */
au_set_h_dptr(a->dentry, a->mvd_bdst, NULL);
au_set_dbbot(a->dentry, a->mvd_bsrc);
au_set_h_iptr(a->inode, a->mvd_bdst, NULL, /*flags*/0);
au_set_ibbot(a->inode, a->mvd_bsrc);
}
if (au_dbbot(a->dentry) < a->mvd_bdst)
au_set_dbbot(a->dentry, a->mvd_bdst);
if (au_ibbot(a->inode) < a->mvd_bdst)
au_set_ibbot(a->inode, a->mvd_bdst);
out_unlock:
au_do_unlock(dmsg, a);
out:
AuTraceErr(err);
return err;
}
static int au_mvd_args(const unsigned char dmsg, struct au_mvd_args *a)
{
int err;
struct au_branch *br;
err = -EISDIR;
if (unlikely(S_ISDIR(a->inode->i_mode)))
goto out;
err = -EINVAL;
if (!(a->mvdown.flags & AUFS_MVDOWN_BRID_UPPER))
a->mvd_bsrc = au_ibstart(a->inode);
else {
a->mvd_bsrc = au_br_index(a->sb, a->mvd_src_brid);
if (unlikely(a->mvd_bsrc < 0
|| (a->mvd_bsrc < au_dbstart(a->dentry)
|| au_dbend(a->dentry) < a->mvd_bsrc
|| !au_h_dptr(a->dentry, a->mvd_bsrc))
|| (a->mvd_bsrc < au_ibstart(a->inode)
|| au_ibend(a->inode) < a->mvd_bsrc
|| !au_h_iptr(a->inode, a->mvd_bsrc)))) {
a->mvd_errno = EAU_MVDOWN_NOUPPER;
AU_MVD_PR(dmsg, "no upper\n");
goto out;
}
}
if (unlikely(a->mvd_bsrc == au_sbend(a->sb))) {
a->mvd_errno = EAU_MVDOWN_BOTTOM;
AU_MVD_PR(dmsg, "on the bottom\n");
goto out;
}
a->mvd_h_src_inode = au_h_iptr(a->inode, a->mvd_bsrc);
br = au_sbr(a->sb, a->mvd_bsrc);
err = au_br_rdonly(br);
if (!(a->mvdown.flags & AUFS_MVDOWN_ROUPPER)) {
if (unlikely(err))
goto out;
} else if (!(vfsub_native_ro(a->mvd_h_src_inode)
|| IS_APPEND(a->mvd_h_src_inode))) {
if (err)
a->mvdown.flags |= AUFS_MVDOWN_ROUPPER_R;
/* go on */
} else
goto out;
err = -EINVAL;
if (!(a->mvdown.flags & AUFS_MVDOWN_BRID_LOWER)) {
a->mvd_bdst = find_lower_writable(a);
if (unlikely(a->mvd_bdst < 0)) {
a->mvd_errno = EAU_MVDOWN_BOTTOM;
AU_MVD_PR(dmsg, "no writable lower branch\n");
goto out;
}
} else {
a->mvd_bdst = au_br_index(a->sb, a->mvd_dst_brid);
if (unlikely(a->mvd_bdst < 0
|| au_sbend(a->sb) < a->mvd_bdst)) {
a->mvd_errno = EAU_MVDOWN_NOLOWERBR;
AU_MVD_PR(dmsg, "no lower brid\n");
goto out;
}
}
err = au_mvd_args_busy(dmsg, a);
if (!err)
err = au_mvd_args_parent(dmsg, a);
if (!err)
err = au_mvd_args_intermediate(dmsg, a);
if (!err)
err = au_mvd_args_exist(dmsg, a);
if (!err)
AuDbg("b%d, b%d\n", a->mvd_bsrc, a->mvd_bdst);
out:
AuTraceErr(err);
return err;
}
