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| | /*
* Copyright (C) 2012-2013, Eric Wong <normalperson@yhbt.net>
* License: GPLv3 or later (see COPYING for details)
*/
#include "cmogstored.h"
#include "digest.h"
bool mog_open_expire_retry(struct mog_svc *svc)
{
switch (errno) {
case ENFILE:
case EMFILE:
case ENOMEM:
if (mog_fdmap_expire(svc->idle_timeout) > 0)
return true;
}
return false;
}
/* path must be a free()-able pointer */
struct mog_fd *
mog_file_open_read(struct mog_svc *svc, uint32_t mog_devid, char *path)
{
struct mog_fd *mfd;
struct mog_file *mfile;
int fd;
struct mog_dev *dev = mog_dev_for(svc, mog_devid, false);
mog_dev_wait(dev);
fd = mog_open_read(svc, path);
if (fd < 0) {
mog_dev_post(dev);
if (mog_open_expire_retry(svc)) {
mog_dev_wait(dev);
fd = mog_open_read(svc, path);
if (fd < 0)
mog_dev_post(dev);
}
if (fd < 0)
return NULL;
}
mfd = mog_fd_init(fd, MOG_FD_TYPE_FILE);
mfile = &mfd->as.file;
memset(mfile, 0, sizeof(struct mog_file));
mfile->fsize = -1;
mfile->dev = dev;
mfile->dev_held = true;
mfile->svc = svc;
return mfd;
}
int mog_stat_req(struct mog_svc *svc, uint32_t mog_devid,
const char *path, struct stat *sb)
{
struct mog_dev *dev = mog_dev_for(svc, mog_devid, false);
int rc;
mog_dev_wait(dev);
rc = mog_stat(svc, path, sb);
mog_dev_post(dev);
return rc;
}
static int mkpath_open_put(struct mog_svc *svc, char *path, int flags)
{
int fd = mog_open_put(svc, path, flags);
if (fd < 0 && errno == ENOENT) {
/* directory does not exist, create it and retry open */
if (mog_mkpath_for(svc, path) == 0)
return mog_open_put(svc, path, flags);
syslog(LOG_ERR, "failed to create directory for path=%s (%m)",
path);
errno = ENOENT; /* restore open() errno */
}
return fd;
}
/* path must be a free()-able pointer */
struct mog_fd *
mog_file_open_put(struct mog_svc *svc, uint32_t mog_devid, char *path,
int flags)
{
struct mog_fd *mfd;
struct mog_file *mfile;
int fd;
struct mog_dev *dev = mog_dev_for(svc, mog_devid, false);
mog_dev_wait(dev);
fd = mkpath_open_put(svc, path, flags);
if (fd < 0) {
mog_dev_post(dev);
if (mog_open_expire_retry(svc)) {
mog_dev_wait(dev);
fd = mkpath_open_put(svc, path, flags);
if (fd < 0)
mog_dev_post(dev);
}
if (fd < 0)
return NULL;
}
mfd = mog_fd_init(fd, MOG_FD_TYPE_FILE);
mfile = &mfd->as.file;
memset(mfile, 0, sizeof(struct mog_file));
mfile->svc = svc;
mfile->dev = dev;
mfile->dev_held = true;
return mfd;
}
void mog_file_post(struct mog_fd *mfd)
{
struct mog_file *file = &mfd->as.file;
assert(file->dev_held);
file->dev_held = false;
mog_dev_post(file->dev);
}
void mog_file_wait(struct mog_fd *mfd)
{
struct mog_file *file = &mfd->as.file;
assert(!file->dev_held);
file->dev_held = true;
mog_dev_wait(file->dev);
}
void mog_file_ensure_wait(struct mog_fd *mfd)
{
struct mog_file *file = &mfd->as.file;
if (!file->dev_held) {
file->dev_held = true;
mog_dev_wait(file->dev);
}
}
void mog_file_close(struct mog_fd *mfd)
{
struct mog_file *file = &mfd->as.file;
assert(mfd->fd_type == MOG_FD_TYPE_FILE && "mog_fd is not a file");
if (file->dev_held)
mog_dev_post(file->dev);
/* all of these may already be NULL */
free(file->path);
free(file->tmppath);
mog_digest_destroy(&file->digest);
mog_fd_put(mfd);
}
|