/*
* after branch manipulating, refresh the file.
*/
static int refresh_file(struct file *file, int (*reopen)(struct file *file))
{
int err, need_reopen;
struct dentry *dentry;
aufs_bindex_t bend, bindex;
dentry = file->f_dentry;
err = au_fi_realloc(au_fi(file), au_sbend(dentry->d_sb) + 1);
if (unlikely(err))
goto out;
au_do_refresh_file(file);
err = 0;
need_reopen = 1;
if (!au_test_mmapped(file))
err = au_file_refresh_by_inode(file, &need_reopen);
if (!err && need_reopen && !d_unhashed(dentry))
err = reopen(file);
if (!err) {
au_update_figen(file);
return 0; /* success */
}
/* error, close all lower files */
bend = au_fbend(file);
for (bindex = au_fbstart(file); bindex <= bend; bindex++)
au_set_h_fptr(file, bindex, NULL);
out:
return err;
}
/*
* after branch manipulating, refresh the file.
*/
static int refresh_file(struct file *file, int (*reopen)(struct file *file))
{
int err, need_reopen;
aufs_bindex_t bend, bindex;
struct dentry *dentry;
struct au_finfo *finfo;
struct au_hfile *hfile;
dentry = file->f_dentry;
finfo = au_fi(file);
if (!finfo->fi_hdir) {
hfile = &finfo->fi_htop;
AuDebugOn(!hfile->hf_file);
bindex = au_br_index(dentry->d_sb, hfile->hf_br->br_id);
AuDebugOn(bindex < 0);
if (bindex != finfo->fi_btop)
au_set_fbstart(file, bindex);
} else {
err = au_fidir_realloc(finfo, au_sbend(dentry->d_sb) + 1);
if (unlikely(err))
goto out;
au_do_refresh_dir(file);
}
err = 0;
need_reopen = 1;
if (!au_test_mmapped(file))
err = au_file_refresh_by_inode(file, &need_reopen);
if (!err && need_reopen && !d_unlinked(dentry))
err = reopen(file);
if (!err) {
au_update_figen(file);
goto out; /* success */
}
/* error, close all lower files */
if (finfo->fi_hdir) {
bend = au_fbend_dir(file);
for (bindex = au_fbstart(file); bindex <= bend; bindex++)
au_set_h_fptr(file, bindex, NULL);
}
out:
return err;
}
static void au_do_refresh_dir(struct file *file)
{
aufs_bindex_t bindex, bend, new_bindex, brid;
struct au_hfile *p, tmp, *q;
struct au_finfo *finfo;
struct super_block *sb;
struct au_fidir *fidir;
FiMustWriteLock(file);
sb = file->f_dentry->d_sb;
finfo = au_fi(file);
fidir = finfo->fi_hdir;
AuDebugOn(!fidir);
p = fidir->fd_hfile + finfo->fi_btop;
brid = p->hf_br->br_id;
bend = fidir->fd_bbot;
for (bindex = finfo->fi_btop; bindex <= bend; bindex++, p++) {
if (!p->hf_file)
continue;
new_bindex = au_br_index(sb, p->hf_br->br_id);
if (new_bindex == bindex)
continue;
if (new_bindex < 0) {
au_set_h_fptr(file, bindex, NULL);
continue;
}
/* swap two lower inode, and loop again */
q = fidir->fd_hfile + new_bindex;
tmp = *q;
*q = *p;
*p = tmp;
if (tmp.hf_file) {
bindex--;
p--;
}
}
p = fidir->fd_hfile;
if (!au_test_mmapped(file) && !d_unlinked(file->f_dentry)) {
bend = au_sbend(sb);
for (finfo->fi_btop = 0; finfo->fi_btop <= bend;
finfo->fi_btop++, p++)
if (p->hf_file) {
if (p->hf_file->f_dentry
&& p->hf_file->f_dentry->d_inode)
break;
else
au_hfput(p, file);
}
} else {
bend = au_br_index(sb, brid);
for (finfo->fi_btop = 0; finfo->fi_btop < bend;
finfo->fi_btop++, p++)
if (p->hf_file)
au_hfput(p, file);
bend = au_sbend(sb);
}
p = fidir->fd_hfile + bend;
for (fidir->fd_bbot = bend; fidir->fd_bbot >= finfo->fi_btop;
fidir->fd_bbot--, p--)
if (p->hf_file) {
if (p->hf_file->f_dentry
&& p->hf_file->f_dentry->d_inode)
break;
else
au_hfput(p, file);
}
AuDebugOn(fidir->fd_bbot < finfo->fi_btop);
}
static int au_file_refresh_by_inode(struct file *file, int *need_reopen)
{
int err;
struct au_pin pin;
struct au_finfo *finfo;
struct dentry *parent, *hi_wh;
struct inode *inode;
struct super_block *sb;
struct au_cp_generic cpg = {
.dentry = file->f_dentry,
.bdst = -1,
.bsrc = -1,
.len = -1,
.pin = &pin,
.flags = AuCpup_DTIME
};
FiMustWriteLock(file);
err = 0;
finfo = au_fi(file);
sb = cpg.dentry->d_sb;
inode = cpg.dentry->d_inode;
cpg.bdst = au_ibstart(inode);
if (cpg.bdst == finfo->fi_btop || IS_ROOT(cpg.dentry))
goto out;
parent = dget_parent(cpg.dentry);
if (au_test_ro(sb, cpg.bdst, inode)) {
di_read_lock_parent(parent, !AuLock_IR);
err = AuWbrCopyup(au_sbi(sb), cpg.dentry);
cpg.bdst = err;
di_read_unlock(parent, !AuLock_IR);
if (unlikely(err < 0))
goto out_parent;
err = 0;
}
di_read_lock_parent(parent, AuLock_IR);
hi_wh = au_hi_wh(inode, cpg.bdst);
if (!S_ISDIR(inode->i_mode)
&& au_opt_test(au_mntflags(sb), PLINK)
&& au_plink_test(inode)
&& !d_unhashed(cpg.dentry)
&& cpg.bdst < au_dbstart(cpg.dentry)) {
err = au_test_and_cpup_dirs(cpg.dentry, cpg.bdst);
if (unlikely(err))
goto out_unlock;
/* always superio. */
err = au_pin(&pin, cpg.dentry, cpg.bdst, AuOpt_UDBA_NONE,
AuPin_DI_LOCKED | AuPin_MNT_WRITE);
if (!err) {
err = au_sio_cpup_simple(&cpg);
au_unpin(&pin);
}
} else if (hi_wh) {
/* already copied-up after unlink */
err = au_reopen_wh(file, cpg.bdst, hi_wh);
*need_reopen = 0;
}
out_unlock:
di_read_unlock(parent, AuLock_IR);
out_parent:
dput(parent);
out:
return err;
}
static void au_do_refresh_dir(struct file *file)
{
aufs_bindex_t bindex, bend, new_bindex, brid;
struct au_hfile *p, tmp, *q;
struct au_finfo *finfo;
struct super_block *sb;
struct au_fidir *fidir;
FiMustWriteLock(file);
sb = file->f_dentry->d_sb;
finfo = au_fi(file);
fidir = finfo->fi_hdir;
AuDebugOn(!fidir);
p = fidir->fd_hfile + finfo->fi_btop;
brid = p->hf_br->br_id;
bend = fidir->fd_bbot;
for (bindex = finfo->fi_btop; bindex <= bend; bindex++, p++) {
if (!p->hf_file)
continue;
new_bindex = au_br_index(sb, p->hf_br->br_id);
if (new_bindex == bindex)
continue;
if (new_bindex < 0) {
au_set_h_fptr(file, bindex, NULL);
continue;
}
/* swap two lower inode, and loop again */
q = fidir->fd_hfile + new_bindex;
tmp = *q;
*q = *p;
*p = tmp;
if (tmp.hf_file) {
bindex--;
p--;
}
}
p = fidir->fd_hfile;
if (!au_test_mmapped(file) && !d_unlinked(file->f_dentry)) {
bend = au_sbend(sb);
for (finfo->fi_btop = 0; finfo->fi_btop <= bend;
finfo->fi_btop++, p++)
if (p->hf_file) {
if (file_inode(p->hf_file))
break;
else
au_hfput(p, file);
}
} else {
bend = au_br_index(sb, brid);
for (finfo->fi_btop = 0; finfo->fi_btop < bend;
finfo->fi_btop++, p++)
if (p->hf_file)
au_hfput(p, file);
bend = au_sbend(sb);
}
p = fidir->fd_hfile + bend;
for (fidir->fd_bbot = bend; fidir->fd_bbot >= finfo->fi_btop;
fidir->fd_bbot--, p--)
if (p->hf_file) {
if (file_inode(p->hf_file))
break;
else
au_hfput(p, file);
}
AuDebugOn(fidir->fd_bbot < finfo->fi_btop);
}
