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mcoverlayfs: vfs_readdir -> iterate_dir compat for el7.5

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Also enable mcoverlay for new kernel version / actually build it

Change-Id: I80bc043c65cf99c3b41a54a5666ea7652e6c2bbd
This commit is contained in:
Dominique Martinet
2018-07-31 15:19:15 +09:00
committed by Dominique Martinet
parent e8f8660b73
commit 3e3f3c5590
3 changed files with 40 additions and 2 deletions
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2
arch/x86_64/tools/mcreboot-smp-x86.sh.in
View File

@ -232,7 +232,7 @@ if [ "${ENABLE_MCOVERLAYFS}" == "yes" ]; then
enable_mcoverlay="yes"
fi
else
if [ ${linux_version_code} -eq 199168 -a ${rhel_release} -ge 327 -a ${rhel_release} -le 693 ]; then
if [ ${linux_version_code} -eq 199168 -a ${rhel_release} -ge 327 -a ${rhel_release} -le 862 ]; then
enable_mcoverlay="yes"
fi
if [ ${linux_version_code} -ge 262144 -a ${linux_version_code} -lt 262400 ]; then

2
executer/kernel/mcoverlayfs/Makefile.in
View File

@ -21,7 +21,7 @@ endif
endif
ifeq ($(BUILD_MODULE_TMP),rhel)
ifeq ($(BUILD_MODULE),none)
BUILD_MODULE=$(shell if [ ${LINUX_VERSION_CODE} -eq 199168 -a ${RHEL_RELEASE} -ge 327 -a ${RHEL_RELEASE} -le 693 ]; then echo "linux-3.10.0-327.36.1.el7"; else echo "none"; fi)
BUILD_MODULE=$(shell if [ ${LINUX_VERSION_CODE} -eq 199168 -a ${RHEL_RELEASE} -ge 327 -a ${RHEL_RELEASE} -le 862 ]; then echo "linux-3.10.0-327.36.1.el7"; else echo "none"; fi)
endif
ifeq ($(BUILD_MODULE),none)
BUILD_MODULE=$(shell if [ ${LINUX_VERSION_CODE} -ge 262144 -a ${LINUX_VERSION_CODE} -lt 262400 ]; then echo "linux-4.0.9"; else echo "none"; fi)

38
executer/kernel/mcoverlayfs/linux-3.10.0-327.36.1.el7/readdir.c
View File

@ -15,6 +15,7 @@
#include <linux/rbtree.h>
#include <linux/security.h>
#include <linux/cred.h>
#include <linux/version.h>
#include "overlayfs.h"
struct ovl_cache_entry {
@ -34,10 +35,18 @@ struct ovl_dir_cache {
struct list_head entries;
};
/* vfs_readdir vs. iterate_dir compat */
#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 11, 0) || \
(defined(RHEL_RELEASE_CODE) && RHEL_RELEASE_CODE >= RHEL_RELEASE_VERSION(7, 5))
#define USE_ITERATE_DIR 1
#endif
#ifndef USE_ITERATE_DIR
struct dir_context {
const filldir_t actor;
//loff_t pos;
};
#endif
struct ovl_readdir_data {
struct dir_context ctx;
@ -256,7 +265,11 @@ static inline int ovl_dir_read(struct path *realpath,
do {
rdd->count = 0;
rdd->err = 0;
#ifdef USE_ITERATE_DIR
err = iterate_dir(realfile, &rdd->ctx);
#else
err = vfs_readdir(realfile, rdd->ctx.actor, rdd);
#endif
if (err >= 0)
err = rdd->err;
} while (!err && rdd->count);
@ -365,6 +378,22 @@ static struct ovl_dir_cache *ovl_cache_get(struct dentry *dentry)
return cache;
}
#ifdef USE_ITERATE_DIR
struct iterate_wrapper {
struct dir_context ctx;
filldir_t actor;
void *buf;
};
static int ovl_wrap_readdir(void *ctx, const char *name, int namelen,
loff_t offset, u64 ino, unsigned int d_type)
{
struct iterate_wrapper *w = ctx;
return w->actor(w->buf, name, namelen, offset, ino, d_type);
}
#endif
static int ovl_readdir(struct file *file, void *buf, filldir_t filler)
{
struct ovl_dir_file *od = file->private_data;
@ -376,7 +405,16 @@ static int ovl_readdir(struct file *file, void *buf, filldir_t filler)
ovl_dir_reset(file);
if (od->is_real) {
#ifdef USE_ITERATE_DIR
struct iterate_wrapper w = {
.ctx.actor = ovl_wrap_readdir,
.actor = filler,
.buf = buf,
};
res = iterate_dir(od->realfile, &w.ctx);
#else
res = vfs_readdir(od->realfile, filler, buf);
#endif
file->f_pos = od->realfile->f_pos;
return res;