mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-24 06:00:52 +07:00
150 lines
3.3 KiB
C
150 lines
3.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2005-2019 Junjiro R. Okajima
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*
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* This program, aufs is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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* file private data
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*/
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#include "aufs.h"
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void au_hfput(struct au_hfile *hf, int execed)
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{
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if (execed)
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allow_write_access(hf->hf_file);
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fput(hf->hf_file);
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hf->hf_file = NULL;
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au_lcnt_dec(&hf->hf_br->br_nfiles);
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hf->hf_br = NULL;
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}
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void au_set_h_fptr(struct file *file, aufs_bindex_t bindex, struct file *val)
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{
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struct au_finfo *finfo = au_fi(file);
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struct au_hfile *hf;
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struct au_fidir *fidir;
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fidir = finfo->fi_hdir;
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if (!fidir) {
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AuDebugOn(finfo->fi_btop != bindex);
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hf = &finfo->fi_htop;
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} else
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hf = fidir->fd_hfile + bindex;
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if (hf && hf->hf_file)
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au_hfput(hf, vfsub_file_execed(file));
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if (val) {
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FiMustWriteLock(file);
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AuDebugOn(IS_ERR_OR_NULL(file->f_path.dentry));
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hf->hf_file = val;
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hf->hf_br = au_sbr(file->f_path.dentry->d_sb, bindex);
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}
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}
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void au_update_figen(struct file *file)
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{
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atomic_set(&au_fi(file)->fi_generation, au_digen(file->f_path.dentry));
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/* smp_mb(); */ /* atomic_set */
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}
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/* ---------------------------------------------------------------------- */
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struct au_fidir *au_fidir_alloc(struct super_block *sb)
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{
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struct au_fidir *fidir;
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int nbr;
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nbr = au_sbbot(sb) + 1;
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if (nbr < 2)
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nbr = 2; /* initial allocate for 2 branches */
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fidir = kzalloc(au_fidir_sz(nbr), GFP_NOFS);
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if (fidir) {
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fidir->fd_bbot = -1;
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fidir->fd_nent = nbr;
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}
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return fidir;
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}
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int au_fidir_realloc(struct au_finfo *finfo, int nbr, int may_shrink)
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{
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int err;
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struct au_fidir *fidir, *p;
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AuRwMustWriteLock(&finfo->fi_rwsem);
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fidir = finfo->fi_hdir;
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AuDebugOn(!fidir);
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err = -ENOMEM;
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p = au_kzrealloc(fidir, au_fidir_sz(fidir->fd_nent), au_fidir_sz(nbr),
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GFP_NOFS, may_shrink);
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if (p) {
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p->fd_nent = nbr;
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finfo->fi_hdir = p;
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err = 0;
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}
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return err;
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}
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/* ---------------------------------------------------------------------- */
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void au_finfo_fin(struct file *file)
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{
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struct au_finfo *finfo;
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au_lcnt_dec(&au_sbi(file->f_path.dentry->d_sb)->si_nfiles);
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finfo = au_fi(file);
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AuDebugOn(finfo->fi_hdir);
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AuRwDestroy(&finfo->fi_rwsem);
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au_cache_free_finfo(finfo);
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}
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void au_fi_init_once(void *_finfo)
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{
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struct au_finfo *finfo = _finfo;
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au_rw_init(&finfo->fi_rwsem);
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}
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int au_finfo_init(struct file *file, struct au_fidir *fidir)
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{
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int err;
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struct au_finfo *finfo;
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struct dentry *dentry;
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err = -ENOMEM;
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dentry = file->f_path.dentry;
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finfo = au_cache_alloc_finfo();
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if (unlikely(!finfo))
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goto out;
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err = 0;
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au_lcnt_inc(&au_sbi(dentry->d_sb)->si_nfiles);
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au_rw_write_lock(&finfo->fi_rwsem);
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finfo->fi_btop = -1;
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finfo->fi_hdir = fidir;
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atomic_set(&finfo->fi_generation, au_digen(dentry));
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/* smp_mb(); */ /* atomic_set */
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file->private_data = finfo;
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out:
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return err;
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}
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