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/*
* Copyright (C) 2005-2016 Junjiro R. Okajima
*/
/*
* inode private data
*/
#include "aufs.h"
struct inode *au_h_iptr(struct inode *inode, aufs_bindex_t bindex)
{
struct inode *h_inode;
struct au_hinode *hinode;
IiMustAnyLock(inode);
hinode = au_hinode(au_ii(inode), bindex);
h_inode = hinode->hi_inode;
AuDebugOn(h_inode && atomic_read(&h_inode->i_count) <= 0);
return h_inode;
}
/* todo: hard/soft set? */
void au_hiput(struct au_hinode *hinode)
{
au_hn_free(hinode);
dput(hinode->hi_whdentry);
iput(hinode->hi_inode);
}
unsigned int au_hi_flags(struct inode *inode, int isdir)
{
unsigned int flags;
const unsigned int mnt_flags = au_mntflags(inode->i_sb);
flags = 0;
if (au_opt_test(mnt_flags, XINO))
au_fset_hi(flags, XINO);
if (isdir && au_opt_test(mnt_flags, UDBA_HNOTIFY))
au_fset_hi(flags, HNOTIFY);
return flags;
}
void au_set_h_iptr(struct inode *inode, aufs_bindex_t bindex,
struct inode *h_inode, unsigned int flags)
{
struct au_hinode *hinode;
struct inode *hi;
struct au_iinfo *iinfo = au_ii(inode);
IiMustWriteLock(inode);
hinode = au_hinode(iinfo, bindex);
hi = hinode->hi_inode;
AuDebugOn(h_inode && atomic_read(&h_inode->i_count) <= 0);
if (hi)
au_hiput(hinode);
hinode->hi_inode = h_inode;
if (h_inode) {
int err;
struct super_block *sb = inode->i_sb;
struct au_branch *br;
AuDebugOn(inode->i_mode
&& (h_inode->i_mode & S_IFMT)
!= (inode->i_mode & S_IFMT));
if (bindex == iinfo->ii_btop)
au_cpup_igen(inode, h_inode);
br = au_sbr(sb, bindex);
hinode->hi_id = br->br_id;
if (au_ftest_hi(flags, XINO)) {
err = au_xino_write(sb, bindex, h_inode->i_ino,
inode->i_ino);
if (unlikely(err))
AuIOErr1("failed au_xino_write() %d\n", err);
}
if (au_ftest_hi(flags, HNOTIFY)
&& au_br_hnotifyable(br->br_perm)) {
err = au_hn_alloc(hinode, inode);
if (unlikely(err))
AuIOErr1("au_hn_alloc() %d\n", err);
}
}
}
void au_set_hi_wh(struct inode *inode, aufs_bindex_t bindex,
struct dentry *h_wh)
{
struct au_hinode *hinode;
IiMustWriteLock(inode);
hinode = au_hinode(au_ii(inode), bindex);
AuDebugOn(hinode->hi_whdentry);
hinode->hi_whdentry = h_wh;
}
void au_update_iigen(struct inode *inode, int half)
{
struct au_iinfo *iinfo;
struct au_iigen *iigen;
unsigned int sigen;
sigen = au_sigen(inode->i_sb);
iinfo = au_ii(inode);
iigen = &iinfo->ii_generation;
spin_lock(&iigen->ig_spin);
iigen->ig_generation = sigen;
if (half)
au_ig_fset(iigen->ig_flags, HALF_REFRESHED);
else
au_ig_fclr(iigen->ig_flags, HALF_REFRESHED);
spin_unlock(&iigen->ig_spin);
}
/* it may be called at remount time, too */
void au_update_ibrange(struct inode *inode, int do_put_zero)
{
struct au_iinfo *iinfo;
aufs_bindex_t bindex, bbot;
AuDebugOn(au_is_bad_inode(inode));
IiMustWriteLock(inode);
iinfo = au_ii(inode);
if (do_put_zero && iinfo->ii_btop >= 0) {
for (bindex = iinfo->ii_btop; bindex <= iinfo->ii_bbot;
bindex++) {
struct inode *h_i;
h_i = au_hinode(iinfo, bindex)->hi_inode;
if (h_i
&& !h_i->i_nlink
&& !(h_i->i_state & I_LINKABLE))
au_set_h_iptr(inode, bindex, NULL, 0);
}
}
iinfo->ii_btop = -1;
iinfo->ii_bbot = -1;
bbot = au_sbbot(inode->i_sb);
for (bindex = 0; bindex <= bbot; bindex++)
if (au_hinode(iinfo, bindex)->hi_inode) {
iinfo->ii_btop = bindex;
break;
}
if (iinfo->ii_btop >= 0)
for (bindex = bbot; bindex >= iinfo->ii_btop; bindex--)
if (au_hinode(iinfo, bindex)->hi_inode) {
iinfo->ii_bbot = bindex;
break;
}
AuDebugOn(iinfo->ii_btop > iinfo->ii_bbot);
}
/* ---------------------------------------------------------------------- */
void au_icntnr_init_once(void *_c)
{
struct au_icntnr *c = _c;
struct au_iinfo *iinfo = &c->iinfo;
spin_lock_init(&iinfo->ii_generation.ig_spin);
au_rw_init(&iinfo->ii_rwsem);
inode_init_once(&c->vfs_inode);
}
void au_hinode_init(struct au_hinode *hinode)
{
hinode->hi_inode = NULL;
hinode->hi_id = -1;
au_hn_init(hinode);
hinode->hi_whdentry = NULL;
}
int au_iinfo_init(struct inode *inode)
{
struct au_iinfo *iinfo;
struct super_block *sb;
struct au_hinode *hi;
int nbr, i;
sb = inode->i_sb;
iinfo = &(container_of(inode, struct au_icntnr, vfs_inode)->iinfo);
nbr = au_sbbot(sb) + 1;
if (unlikely(nbr <= 0))
nbr = 1;
hi = kmalloc_array(nbr, sizeof(*iinfo->ii_hinode), GFP_NOFS);
if (hi) {
au_ninodes_inc(sb);
iinfo->ii_hinode = hi;
for (i = 0; i < nbr; i++, hi++)
au_hinode_init(hi);
iinfo->ii_generation.ig_generation = au_sigen(sb);
iinfo->ii_btop = -1;
iinfo->ii_bbot = -1;
iinfo->ii_vdir = NULL;
return 0;
}
return -ENOMEM;
}
int au_hinode_realloc(struct au_iinfo *iinfo, int nbr)
{
int err, i;
struct au_hinode *hip;
AuRwMustWriteLock(&iinfo->ii_rwsem);
err = -ENOMEM;
hip = krealloc(iinfo->ii_hinode, sizeof(*hip) * nbr, GFP_NOFS);
if (hip) {
iinfo->ii_hinode = hip;
i = iinfo->ii_bbot + 1;
hip += i;
for (; i < nbr; i++, hip++)
au_hinode_init(hip);
err = 0;
}
return err;
}
void au_iinfo_fin(struct inode *inode)
{
struct au_iinfo *iinfo;
struct au_hinode *hi;
struct super_block *sb;
aufs_bindex_t bindex, bbot;
const unsigned char unlinked = !inode->i_nlink;
AuDebugOn(au_is_bad_inode(inode));
sb = inode->i_sb;
au_ninodes_dec(sb);
if (si_pid_test(sb))
au_xino_delete_inode(inode, unlinked);
else {
/*
* it is safe to hide the dependency between sbinfo and
* sb->s_umount.
*/
lockdep_off();
si_noflush_read_lock(sb);
au_xino_delete_inode(inode, unlinked);
si_read_unlock(sb);
lockdep_on();
}
iinfo = au_ii(inode);
if (iinfo->ii_vdir)
au_vdir_free(iinfo->ii_vdir);
bindex = iinfo->ii_btop;
if (bindex >= 0) {
hi = au_hinode(iinfo, bindex);
bbot = iinfo->ii_bbot;
while (bindex++ <= bbot) {
if (hi->hi_inode)
au_hiput(hi);
hi++;
}
}
kfree(iinfo->ii_hinode);
AuRwDestroy(&iinfo->ii_rwsem);
}
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