unsigned int aufs_poll(struct file *file, poll_table *wait)
{
unsigned int mask;
int err;
struct file *h_file;
struct dentry *dentry;
struct super_block *sb;
/* We should pretend an error happened. */
mask = POLLERR /* | POLLIN | POLLOUT */;
dentry = file->f_path.dentry;
sb = dentry->d_sb;
si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLMW);
err = au_reval_and_lock_fdi(file, au_reopen_nondir, /*wlock*/0);
if (unlikely(err))
goto out;
/* it is not an error if h_file has no operation */
mask = DEFAULT_POLLMASK;
h_file = au_hf_top(file);
if (h_file->f_op->poll)
mask = h_file->f_op->poll(h_file, wait);
di_read_unlock(dentry, AuLock_IR);
fi_read_unlock(file);
out:
si_read_unlock(sb);
AuTraceErr((int)mask);
return mask;
}
static ssize_t aufs_aio_write_sp(struct kiocb *kio, const struct iovec *iov,
unsigned long nv, loff_t pos)
{
ssize_t err;
aufs_bindex_t bstart;
unsigned char wbr;
struct super_block *sb;
struct file *file, *h_file;
file = kio->ki_filp;
sb = file->f_dentry->d_sb;
si_read_lock(sb, AuLock_FLUSH);
fi_read_lock(file);
bstart = au_fbstart(file);
h_file = au_hf_top(file);
fi_read_unlock(file);
wbr = !!au_br_writable(au_sbr(sb, bstart)->br_perm);
si_read_unlock(sb);
/* do not change the file in kio */
AuDebugOn(!h_file->f_op || !h_file->f_op->aio_write);
err = h_file->f_op->aio_write(kio, iov, nv, pos);
if (err > 0 && wbr)
file_update_time(h_file);
return err;
}
static int aufs_release_sp(struct inode *inode, struct file *file)
{
int err;
struct file *h_file;
fi_read_lock(file);
h_file = au_hf_top(file);
fi_read_unlock(file);
/* close this fifo in aufs */
err = h_file->f_op->release(inode, file); /* ignore */
aufs_release_nondir(inode, file); /* ignore */
return err;
}
int au_do_flush(struct file *file, fl_owner_t id,
int (*flush)(struct file *file, fl_owner_t id))
{
int err;
struct dentry *dentry;
struct super_block *sb;
struct inode *inode;
dentry = file->f_dentry;
sb = dentry->d_sb;
inode = dentry->d_inode;
si_noflush_read_lock(sb);
fi_read_lock(file);
ii_read_lock_child(inode);
err = flush(file, id);
au_cpup_attr_timesizes(inode);
ii_read_unlock(inode);
fi_read_unlock(file);
si_read_unlock(sb);
return err;
}
static int au_rdu(struct file *file, struct aufs_rdu *rdu)
{
int err;
aufs_bindex_t bend;
struct au_rdu_arg arg;
struct dentry *dentry;
struct inode *inode;
struct file *h_file;
struct au_rdu_cookie *cookie = &rdu->cookie;
err = !access_ok(VERIFY_WRITE, rdu->ent.e, rdu->sz);
if (unlikely(err)) {
err = -EFAULT;
AuTraceErr(err);
goto out;
}
rdu->rent = 0;
rdu->tail = rdu->ent;
rdu->full = 0;
arg.rdu = rdu;
arg.ent = rdu->ent;
arg.end = arg.ent.ul;
arg.end += rdu->sz;
err = -ENOTDIR;
if (unlikely(!file->f_op || !file->f_op->readdir))
goto out;
err = security_file_permission(file, MAY_READ);
AuTraceErr(err);
if (unlikely(err))
goto out;
dentry = file->f_dentry;
inode = dentry->d_inode;
#if 1
mutex_lock(&inode->i_mutex);
#else
err = mutex_lock_killable(&inode->i_mutex);
AuTraceErr(err);
if (unlikely(err))
goto out;
#endif
err = -ENOENT;
if (unlikely(IS_DEADDIR(inode)))
goto out_mtx;
arg.sb = inode->i_sb;
si_read_lock(arg.sb, AuLock_FLUSH);
fi_read_lock(file);
err = -EAGAIN;
if (unlikely(au_ftest_rdu(cookie->flags, CONT)
&& cookie->generation != au_figen(file)))
goto out_unlock;
err = 0;
if (!rdu->blk) {
rdu->blk = au_sbi(arg.sb)->si_rdblk;
if (!rdu->blk)
rdu->blk = au_dir_size(file, /*dentry*/NULL);
}
bend = au_fbstart(file);
if (cookie->bindex < bend)
cookie->bindex = bend;
bend = au_fbend_dir(file);
/* AuDbg("b%d, b%d\n", cookie->bindex, bend); */
for (; !err && cookie->bindex <= bend;
cookie->bindex++, cookie->h_pos = 0) {
h_file = au_hf_dir(file, cookie->bindex);
if (!h_file)
continue;
au_fclr_rdu(cookie->flags, FULL);
err = au_rdu_do(h_file, &arg);
AuTraceErr(err);
if (unlikely(au_ftest_rdu(cookie->flags, FULL) || err))
break;
}
AuDbg("rent %llu\n", rdu->rent);
if (!err && !au_ftest_rdu(cookie->flags, CONT)) {
rdu->shwh = !!au_opt_test(au_sbi(arg.sb)->si_mntflags, SHWH);
au_fset_rdu(cookie->flags, CONT);
cookie->generation = au_figen(file);
}
ii_read_lock_child(inode);
fsstack_copy_attr_atime(inode, au_h_iptr(inode, au_ibstart(inode)));
ii_read_unlock(inode);
out_unlock:
fi_read_unlock(file);
si_read_unlock(arg.sb);
out_mtx:
mutex_unlock(&inode->i_mutex);
out:
AuTraceErr(err);
return err;
}
static int au_ready_to_write_wh(struct file *file, loff_t len,
aufs_bindex_t bcpup, struct au_pin *pin)
{
int err;
struct inode *inode, *h_inode;
struct dentry *h_dentry, *hi_wh;
struct au_cp_generic cpg = {
.dentry = file->f_dentry,
.bdst = bcpup,
.bsrc = -1,
.len = len,
.pin = pin
};
au_update_dbstart(cpg.dentry);
inode = cpg.dentry->d_inode;
h_inode = NULL;
if (au_dbstart(cpg.dentry) <= bcpup
&& au_dbend(cpg.dentry) >= bcpup) {
h_dentry = au_h_dptr(cpg.dentry, bcpup);
if (h_dentry)
h_inode = h_dentry->d_inode;
}
hi_wh = au_hi_wh(inode, bcpup);
if (!hi_wh && !h_inode)
err = au_sio_cpup_wh(&cpg, file);
else
/* already copied-up after unlink */
err = au_reopen_wh(file, bcpup, hi_wh);
if (!err
&& inode->i_nlink > 1
&& au_opt_test(au_mntflags(cpg.dentry->d_sb), PLINK))
au_plink_append(inode, bcpup, au_h_dptr(cpg.dentry, bcpup));
return err;
}
/*
* prepare the @file for writing.
*/
int au_ready_to_write(struct file *file, loff_t len, struct au_pin *pin)
{
int err;
aufs_bindex_t dbstart;
struct dentry *parent, *h_dentry;
struct inode *inode;
struct super_block *sb;
struct file *h_file;
struct au_cp_generic cpg = {
.dentry = file->f_dentry,
.bdst = -1,
.bsrc = -1,
.len = len,
.pin = pin,
.flags = AuCpup_DTIME
};
sb = cpg.dentry->d_sb;
inode = cpg.dentry->d_inode;
AuDebugOn(au_special_file(inode->i_mode));
cpg.bsrc = au_fbstart(file);
err = au_test_ro(sb, cpg.bsrc, inode);
if (!err && (au_hf_top(file)->f_mode & FMODE_WRITE)) {
err = au_pin(pin, cpg.dentry, cpg.bsrc, AuOpt_UDBA_NONE,
/*flags*/0);
goto out;
}
/* need to cpup or reopen */
parent = dget_parent(cpg.dentry);
di_write_lock_parent(parent);
err = AuWbrCopyup(au_sbi(sb), cpg.dentry);
cpg.bdst = err;
if (unlikely(err < 0))
goto out_dgrade;
err = 0;
if (!d_unhashed(cpg.dentry) && !au_h_dptr(parent, cpg.bdst)) {
err = au_cpup_dirs(cpg.dentry, cpg.bdst);
if (unlikely(err))
goto out_dgrade;
}
err = au_pin(pin, cpg.dentry, cpg.bdst, AuOpt_UDBA_NONE,
AuPin_DI_LOCKED | AuPin_MNT_WRITE);
if (unlikely(err))
goto out_dgrade;
h_dentry = au_hf_top(file)->f_dentry;
dbstart = au_dbstart(cpg.dentry);
if (dbstart <= cpg.bdst) {
h_dentry = au_h_dptr(cpg.dentry, cpg.bdst);
AuDebugOn(!h_dentry);
cpg.bsrc = cpg.bdst;
}
if (dbstart <= cpg.bdst /* just reopen */
|| !d_unhashed(cpg.dentry) /* copyup and reopen */
) {
h_file = au_h_open_pre(cpg.dentry, cpg.bsrc, /*force_wr*/0);
if (IS_ERR(h_file))
err = PTR_ERR(h_file);
else {
di_downgrade_lock(parent, AuLock_IR);
if (dbstart > cpg.bdst)
err = au_sio_cpup_simple(&cpg);
if (!err)
err = au_reopen_nondir(file);
au_h_open_post(cpg.dentry, cpg.bsrc, h_file);
}
} else { /* copyup as wh and reopen */
/*
* since writable hfsplus branch is not supported,
* h_open_pre/post() are unnecessary.
*/
err = au_ready_to_write_wh(file, len, cpg.bdst, pin);
di_downgrade_lock(parent, AuLock_IR);
}
if (!err) {
au_pin_set_parent_lflag(pin, /*lflag*/0);
goto out_dput; /* success */
}
au_unpin(pin);
goto out_unlock;
out_dgrade:
di_downgrade_lock(parent, AuLock_IR);
out_unlock:
di_read_unlock(parent, AuLock_IR);
out_dput:
dput(parent);
out:
return err;
}
/* ---------------------------------------------------------------------- */
int au_do_flush(struct file *file, fl_owner_t id,
int (*flush)(struct file *file, fl_owner_t id))
{
int err;
struct super_block *sb;
struct inode *inode;
inode = file_inode(file);
sb = inode->i_sb;
si_noflush_read_lock(sb);
fi_read_lock(file);
ii_read_lock_child(inode);
err = flush(file, id);
au_cpup_attr_timesizes(inode);
ii_read_unlock(inode);
fi_read_unlock(file);
si_read_unlock(sb);
return err;
}