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https://github.com/AetherDroid/android_kernel_samsung_on5xelte.git
synced 2025-09-08 01:08:03 -04:00
Fixed MTP to work with TWRP
This commit is contained in:
awab228
commit
f6dfaef42e
50820 changed files with 20846062 additions and 0 deletions
402
fs/ceph/cache.c
Normal file
402
fs/ceph/cache.c
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@ -0,0 +1,402 @@
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/*
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* Ceph cache definitions.
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*
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* Copyright (C) 2013 by Adfin Solutions, Inc. All Rights Reserved.
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* Written by Milosz Tanski (milosz@adfin.com)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation.
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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, write to:
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* Free Software Foundation
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* 51 Franklin Street, Fifth Floor
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* Boston, MA 02111-1301 USA
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*
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*/
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#include "super.h"
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#include "cache.h"
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struct ceph_aux_inode {
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struct timespec mtime;
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loff_t size;
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};
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struct fscache_netfs ceph_cache_netfs = {
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.name = "ceph",
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.version = 0,
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};
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static uint16_t ceph_fscache_session_get_key(const void *cookie_netfs_data,
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void *buffer, uint16_t maxbuf)
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{
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const struct ceph_fs_client* fsc = cookie_netfs_data;
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uint16_t klen;
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klen = sizeof(fsc->client->fsid);
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if (klen > maxbuf)
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return 0;
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memcpy(buffer, &fsc->client->fsid, klen);
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return klen;
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}
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static const struct fscache_cookie_def ceph_fscache_fsid_object_def = {
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.name = "CEPH.fsid",
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.type = FSCACHE_COOKIE_TYPE_INDEX,
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.get_key = ceph_fscache_session_get_key,
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};
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int ceph_fscache_register(void)
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{
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return fscache_register_netfs(&ceph_cache_netfs);
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}
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void ceph_fscache_unregister(void)
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{
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fscache_unregister_netfs(&ceph_cache_netfs);
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}
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int ceph_fscache_register_fs(struct ceph_fs_client* fsc)
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{
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fsc->fscache = fscache_acquire_cookie(ceph_cache_netfs.primary_index,
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&ceph_fscache_fsid_object_def,
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fsc, true);
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if (fsc->fscache == NULL) {
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pr_err("Unable to resgister fsid: %p fscache cookie", fsc);
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return 0;
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}
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fsc->revalidate_wq = alloc_workqueue("ceph-revalidate", 0, 1);
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if (fsc->revalidate_wq == NULL)
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return -ENOMEM;
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return 0;
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}
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static uint16_t ceph_fscache_inode_get_key(const void *cookie_netfs_data,
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void *buffer, uint16_t maxbuf)
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{
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const struct ceph_inode_info* ci = cookie_netfs_data;
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uint16_t klen;
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/* use ceph virtual inode (id + snaphot) */
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klen = sizeof(ci->i_vino);
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if (klen > maxbuf)
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return 0;
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memcpy(buffer, &ci->i_vino, klen);
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return klen;
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}
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static uint16_t ceph_fscache_inode_get_aux(const void *cookie_netfs_data,
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void *buffer, uint16_t bufmax)
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{
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struct ceph_aux_inode aux;
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const struct ceph_inode_info* ci = cookie_netfs_data;
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const struct inode* inode = &ci->vfs_inode;
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memset(&aux, 0, sizeof(aux));
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aux.mtime = inode->i_mtime;
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aux.size = inode->i_size;
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memcpy(buffer, &aux, sizeof(aux));
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return sizeof(aux);
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}
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static void ceph_fscache_inode_get_attr(const void *cookie_netfs_data,
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uint64_t *size)
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{
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const struct ceph_inode_info* ci = cookie_netfs_data;
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const struct inode* inode = &ci->vfs_inode;
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*size = inode->i_size;
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}
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static enum fscache_checkaux ceph_fscache_inode_check_aux(
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void *cookie_netfs_data, const void *data, uint16_t dlen)
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{
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struct ceph_aux_inode aux;
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struct ceph_inode_info* ci = cookie_netfs_data;
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struct inode* inode = &ci->vfs_inode;
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if (dlen != sizeof(aux))
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return FSCACHE_CHECKAUX_OBSOLETE;
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memset(&aux, 0, sizeof(aux));
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aux.mtime = inode->i_mtime;
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aux.size = inode->i_size;
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if (memcmp(data, &aux, sizeof(aux)) != 0)
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return FSCACHE_CHECKAUX_OBSOLETE;
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dout("ceph inode 0x%p cached okay", ci);
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return FSCACHE_CHECKAUX_OKAY;
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}
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static void ceph_fscache_inode_now_uncached(void* cookie_netfs_data)
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{
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struct ceph_inode_info* ci = cookie_netfs_data;
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struct pagevec pvec;
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pgoff_t first;
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int loop, nr_pages;
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pagevec_init(&pvec, 0);
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first = 0;
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dout("ceph inode 0x%p now uncached", ci);
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while (1) {
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nr_pages = pagevec_lookup(&pvec, ci->vfs_inode.i_mapping, first,
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PAGEVEC_SIZE - pagevec_count(&pvec));
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if (!nr_pages)
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break;
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for (loop = 0; loop < nr_pages; loop++)
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ClearPageFsCache(pvec.pages[loop]);
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first = pvec.pages[nr_pages - 1]->index + 1;
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pvec.nr = nr_pages;
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pagevec_release(&pvec);
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cond_resched();
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}
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}
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static const struct fscache_cookie_def ceph_fscache_inode_object_def = {
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.name = "CEPH.inode",
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.type = FSCACHE_COOKIE_TYPE_DATAFILE,
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.get_key = ceph_fscache_inode_get_key,
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.get_attr = ceph_fscache_inode_get_attr,
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.get_aux = ceph_fscache_inode_get_aux,
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.check_aux = ceph_fscache_inode_check_aux,
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.now_uncached = ceph_fscache_inode_now_uncached,
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};
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void ceph_fscache_register_inode_cookie(struct ceph_fs_client* fsc,
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struct ceph_inode_info* ci)
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{
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struct inode* inode = &ci->vfs_inode;
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/* No caching for filesystem */
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if (fsc->fscache == NULL)
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return;
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/* Only cache for regular files that are read only */
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if ((ci->vfs_inode.i_mode & S_IFREG) == 0)
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return;
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/* Avoid multiple racing open requests */
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mutex_lock(&inode->i_mutex);
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if (ci->fscache)
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goto done;
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ci->fscache = fscache_acquire_cookie(fsc->fscache,
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&ceph_fscache_inode_object_def,
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ci, true);
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fscache_check_consistency(ci->fscache);
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done:
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mutex_unlock(&inode->i_mutex);
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}
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void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info* ci)
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{
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struct fscache_cookie* cookie;
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if ((cookie = ci->fscache) == NULL)
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return;
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ci->fscache = NULL;
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fscache_uncache_all_inode_pages(cookie, &ci->vfs_inode);
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fscache_relinquish_cookie(cookie, 0);
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}
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static void ceph_vfs_readpage_complete(struct page *page, void *data, int error)
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{
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if (!error)
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SetPageUptodate(page);
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}
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static void ceph_vfs_readpage_complete_unlock(struct page *page, void *data, int error)
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{
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if (!error)
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SetPageUptodate(page);
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unlock_page(page);
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}
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static inline int cache_valid(struct ceph_inode_info *ci)
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{
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return ((ceph_caps_issued(ci) & CEPH_CAP_FILE_CACHE) &&
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(ci->i_fscache_gen == ci->i_rdcache_gen));
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}
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/* Atempt to read from the fscache,
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*
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* This function is called from the readpage_nounlock context. DO NOT attempt to
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* unlock the page here (or in the callback).
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*/
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int ceph_readpage_from_fscache(struct inode *inode, struct page *page)
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{
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struct ceph_inode_info *ci = ceph_inode(inode);
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int ret;
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if (!cache_valid(ci))
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return -ENOBUFS;
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ret = fscache_read_or_alloc_page(ci->fscache, page,
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ceph_vfs_readpage_complete, NULL,
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GFP_KERNEL);
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switch (ret) {
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case 0: /* Page found */
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dout("page read submitted\n");
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return 0;
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case -ENOBUFS: /* Pages were not found, and can't be */
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case -ENODATA: /* Pages were not found */
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dout("page/inode not in cache\n");
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return ret;
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default:
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dout("%s: unknown error ret = %i\n", __func__, ret);
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return ret;
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}
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}
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int ceph_readpages_from_fscache(struct inode *inode,
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struct address_space *mapping,
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struct list_head *pages,
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unsigned *nr_pages)
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{
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struct ceph_inode_info *ci = ceph_inode(inode);
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int ret;
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if (!cache_valid(ci))
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return -ENOBUFS;
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ret = fscache_read_or_alloc_pages(ci->fscache, mapping, pages, nr_pages,
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ceph_vfs_readpage_complete_unlock,
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NULL, mapping_gfp_mask(mapping));
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switch (ret) {
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case 0: /* All pages found */
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dout("all-page read submitted\n");
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return 0;
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case -ENOBUFS: /* Some pages were not found, and can't be */
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case -ENODATA: /* some pages were not found */
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dout("page/inode not in cache\n");
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return ret;
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default:
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dout("%s: unknown error ret = %i\n", __func__, ret);
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return ret;
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}
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}
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void ceph_readpage_to_fscache(struct inode *inode, struct page *page)
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{
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struct ceph_inode_info *ci = ceph_inode(inode);
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int ret;
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if (!PageFsCache(page))
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return;
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if (!cache_valid(ci))
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return;
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ret = fscache_write_page(ci->fscache, page, GFP_KERNEL);
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if (ret)
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fscache_uncache_page(ci->fscache, page);
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}
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void ceph_invalidate_fscache_page(struct inode* inode, struct page *page)
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{
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struct ceph_inode_info *ci = ceph_inode(inode);
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if (!PageFsCache(page))
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return;
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fscache_wait_on_page_write(ci->fscache, page);
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fscache_uncache_page(ci->fscache, page);
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}
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void ceph_fscache_unregister_fs(struct ceph_fs_client* fsc)
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{
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if (fsc->revalidate_wq)
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destroy_workqueue(fsc->revalidate_wq);
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fscache_relinquish_cookie(fsc->fscache, 0);
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fsc->fscache = NULL;
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}
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static void ceph_revalidate_work(struct work_struct *work)
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{
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int issued;
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u32 orig_gen;
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struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
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i_revalidate_work);
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struct inode *inode = &ci->vfs_inode;
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spin_lock(&ci->i_ceph_lock);
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issued = __ceph_caps_issued(ci, NULL);
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orig_gen = ci->i_rdcache_gen;
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spin_unlock(&ci->i_ceph_lock);
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if (!(issued & CEPH_CAP_FILE_CACHE)) {
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dout("revalidate_work lost cache before validation %p\n",
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inode);
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goto out;
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}
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if (!fscache_check_consistency(ci->fscache))
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fscache_invalidate(ci->fscache);
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spin_lock(&ci->i_ceph_lock);
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/* Update the new valid generation (backwards sanity check too) */
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if (orig_gen > ci->i_fscache_gen) {
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ci->i_fscache_gen = orig_gen;
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}
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spin_unlock(&ci->i_ceph_lock);
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out:
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iput(&ci->vfs_inode);
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}
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void ceph_queue_revalidate(struct inode *inode)
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{
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struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
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struct ceph_inode_info *ci = ceph_inode(inode);
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if (fsc->revalidate_wq == NULL || ci->fscache == NULL)
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return;
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ihold(inode);
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if (queue_work(ceph_sb_to_client(inode->i_sb)->revalidate_wq,
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&ci->i_revalidate_work)) {
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dout("ceph_queue_revalidate %p\n", inode);
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} else {
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dout("ceph_queue_revalidate %p failed\n)", inode);
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iput(inode);
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}
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}
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void ceph_fscache_inode_init(struct ceph_inode_info *ci)
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{
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ci->fscache = NULL;
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/* The first load is verifed cookie open time */
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ci->i_fscache_gen = 1;
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INIT_WORK(&ci->i_revalidate_work, ceph_revalidate_work);
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}
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