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lessfs.c
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lessfs.c
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/*
* Lessfs: A data deduplicating filesystem.
* Copyright (C) 2008 Mark Ruijter <[email protected]>
*
* This program is s_free software.
* You can redistribute lessfs and/or modify it under the terms of either
* (1) the GNU General Public License; either version 3 of the License,
* or (at your option) any later version as published by
* the Free Software Foundation; or (2) obtain a commercial license
* by contacting the Author.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
* the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#define FUSE_USE_VERSION 26
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#ifndef LFATAL
#include "lib_log.h"
#endif
#define LFSVERSION "1.7.0"
#include <fuse.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <dirent.h>
#include <errno.h>
#include <malloc.h>
#include <sys/time.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/file.h>
#include <sys/un.h>
#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
#include <signal.h>
#include <libgen.h>
#include <sys/utsname.h>
#include <sys/vfs.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <mhash.h>
#include <tcutil.h>
#include <tchdb.h>
#include <tcbdb.h>
#include <stdlib.h>
#include <stdbool.h>
#include "lib_safe.h"
#include "lib_common.h"
#ifdef LZO
#include "lib_lzo.h"
#endif
#include "lib_qlz.h"
#include "lib_qlz15.h"
#ifdef BERKELEYDB
#include <db.h>
#include "lib_bdb.h"
#else
#ifndef HAMSTERDB
#include "lib_tc.h"
#else
#include "lib_hamster.h"
#endif
#endif
#include "lib_net.h"
#include "file_io.h"
#ifdef HAVE_SETXATTR
#include <sys/xattr.h>
#endif
#include "lib_cfg.h"
#include "lib_str.h"
#include "lib_repl.h"
#include "retcodes.h"
#ifdef ENABLE_CRYPTO
#include "lib_crypto.h"
#endif
#include "commons.h"
#ifdef BERKELEYDB
extern char *bdb_lockedby;
#endif
unsigned long working = 0;
unsigned long sequence = 0;
void segvExit()
{
LFATAL("Exit caused by segfault!, exitting\n");
db_close(0);
exit(EXIT_OK);
}
void normalExit()
{
LFATAL("Exit signal received, exitting\n");
db_close(0);
exit(EXIT_OK);
}
void libSafeExit()
{
db_close(0);
LFATAL("Exit signal received from lib_safe, exitting\n");
exit(EXIT_OK);
}
int check_path_sanity(const char *path)
{
char *name;
char *p;
char *q;
int retcode = 0;
FUNC;
LDEBUG("check_path_sanity : %s", path);
name = s_strdup((char *) path);
p = name;
q = p;
while (1) {
p = strrchr(q, '/');
if (p == NULL)
break;
q = p;
q++;
p[0] = 0;
if (q) {
if (strlen(q) > 255) {
LDEBUG("check_path_sanity : error q>255");
retcode = -ENAMETOOLONG;
}
}
q = p--;
}
s_free(name);
EFUNC;
return (retcode);
}
void dbsync()
{
#ifndef BERKELEYDB
#ifndef HAMSTERDB
tcbdbsync(dbdirent);
tchdbsync(dbu);
tchdbsync(dbb);
tchdbsync(dbp);
#endif
#endif
if ( config->blockdata_io_type == FILE_IO ) {
fsync(fdbdta);
}
if (config->replication == 1 && config->replication_role == 0) {
fsync(frepl);
}
}
static int lessfs_getattr(const char *path, struct stat *stbuf)
{
int res = 0;
char *bname, *sqstr;
unsigned long sequence;
static int last_sequence = 1;
FUNC;
LDEBUG("lessfs_getattr %s", path);
res = check_path_sanity(path);
if (res == -ENAMETOOLONG)
return (res);
get_global_lock((char *) __PRETTY_FUNCTION__);
if (0 == strncmp("/.lessfs/locks/", path, strlen("/.lessfs/locks/"))) {
bname = s_basename((char *) path);
get_inode_lock((char *) __PRETTY_FUNCTION__);
res = lckname_to_stat(bname, stbuf);
release_inode_lock();
s_free(bname);
goto end;
}
res = dbstat(path, stbuf, 1);
if (!inode_isnot_locked(stbuf->st_ino))
stbuf->st_mode ^= S_ISVTX;
LDEBUG("lessfs_getattr : %s size %llu : result %i", path,
(unsigned long long) stbuf->st_size, res);
if (0 == strcmp("/.lessfs/lessfs_stats", path)) {
s_free(config->lfsstats);
config->lfsstats = lessfs_stats();
stbuf->st_size = strlen(config->lfsstats);
}
if (0 == strcmp("/.lessfs/replication/enabled", path))
stbuf->st_size = 2;
if (0 == strcmp("/.lessfs/replication/backlog", path))
stbuf->st_size = 2;
if (0 == strcmp("/.lessfs/replication/rotate_replog", path))
stbuf->st_size = 2;
if (0 == strcmp("/.lessfs/replication/sequence", path)) {
sequence = get_sequence();
sqstr = as_sprintf(__FILE__, __LINE__, "%lu", sequence);
// There is no such thing as invalidate cache for the
// High level API. This is a crude hack to make sure that
// the content is not read from cache.
stbuf->st_size = strlen(sqstr) + last_sequence;
last_sequence++;
if (last_sequence > 2)
last_sequence = 1;
s_free(sqstr);
}
end:
release_global_lock();
return (res);
}
static int lessfs_access(const char *path, int mask)
{
int res = 0;
FUNC;
// Empty stub
return (res);
}
static int lessfs_readlink(const char *path, char *buf, size_t size)
{
int res = 0;
FUNC;
LDEBUG("lessfs_readlink : size = %i", (int) size);
get_global_lock((char *) __PRETTY_FUNCTION__);
res = fs_readlink(path, buf, size);
release_global_lock();
return (res);
}
static int lessfs_readdir(const char *path, void *buf,
fuse_fill_dir_t filler, off_t offset,
struct fuse_file_info *fi)
{
int retcode;
get_global_lock((char *) __PRETTY_FUNCTION__);
retcode = fs_readdir(path, buf, filler, offset, fi);
release_global_lock();
return (retcode);
}
static int lessfs_mknod(const char *path, mode_t mode, dev_t rdev)
{
int retcode = 0;
char *dname;
struct stat stbuf;
time_t thetime;
FUNC;
if (config->replication == 1 && config->replication_role == 1) {
LFATAL("lessfs_mknod");
return (-EPERM);
}
get_global_lock((char *) __PRETTY_FUNCTION__);
thetime = time(NULL);
dname = s_dirname((char *) path);
retcode = dbstat(dname, &stbuf, 0);
LDEBUG("lessfs_mknod : dbstat returns %i", retcode);
if (0 == retcode) {
dbmknod(path, mode, NULL, rdev);
stbuf.st_ctim.tv_sec = thetime;
stbuf.st_ctim.tv_nsec = 0;
stbuf.st_mtim.tv_sec = thetime;
stbuf.st_mtim.tv_nsec = 0;
retcode = update_stat(dname, &stbuf);
LDEBUG("lessfs_mknod : update_stat returns %i", retcode);
s_free(dname);
}
release_global_lock();
return (retcode);
}
static int lessfs_mkdir(const char *path, mode_t mode)
{
int ret;
if (config->replication == 1 && config->replication_role == 1) {
return (-EPERM);
}
get_global_lock((char *) __PRETTY_FUNCTION__);
ret = fs_mkdir(path, mode);
release_global_lock();
return (ret);
}
static int lessfs_unlink(const char *path)
{
int res;
struct stat *stbuf;
FUNC;
LDEBUG("lessfs_unlink : %s", path);
if (config->replication == 1 && config->replication_role == 1) {
return (-EPERM);
}
// /.lessfs_stats can not be deleted
if (0 == strcmp(path, "/.lessfs/replication/rotate_replog"))
return (0);
if (0 == strcmp(path, "/.lessfs/replication/enabled"))
return (0);
if (0 == strcmp(path, "/.lessfs/replication/backlog"))
return (0);
if (0 == strcmp(path, "/.lessfs/lessfs_stats"))
return (0);
if (0 == strncmp(path, "/.lessfs/locks", strlen("/.lessfs/locks")))
return (0);
stbuf = s_malloc(sizeof(struct stat));
get_global_lock((char *) __PRETTY_FUNCTION__);
res = dbstat(path, stbuf, 0);
if (res != 0) {
release_global_lock();
s_free(stbuf);
return (res);
}
write_lock((char *) __PRETTY_FUNCTION__);
flush_wait(stbuf->st_ino);
purge_read_cache(stbuf->st_ino, 1, (char *) __PRETTY_FUNCTION__);
meta_lock((char *) __PRETTY_FUNCTION__);
update_filesize_onclose(stbuf->st_ino);
tctreeout(metatree, &stbuf->st_ino, sizeof(unsigned long long));
release_meta_lock();
if (config->blockdatabs) {
res = db_unlink_file(path);
} else {
res = file_unlink_file(path);
}
if (config->relax == 0)
dbsync();
invalidate_p2i((char *) path);
release_write_lock();
release_global_lock();
s_free(stbuf);
if (config->nospace == ENOSPC)
config->nospace = -ENOSPC;
EFUNC;
return res;
}
static int lessfs_rmdir(const char *path)
{
int res;
if (config->replication == 1 && config->replication_role == 1) {
return (-EPERM);
}
if (0 == strncmp(path, "/.lessfs/locks", strlen("/.lessfs/locks")))
return (0);
get_global_lock((char *) __PRETTY_FUNCTION__);
res = fs_rmdir(path);
invalidate_p2i((char *) path);
release_global_lock();
return (res);
}
static int lessfs_symlink(const char *from, const char *to)
{
int res = 0;
FUNC;
get_global_lock((char *) __PRETTY_FUNCTION__);
res = fs_symlink((char *) from, (char *) to);
invalidate_p2i((char *) from);
release_global_lock();
return (res);
}
static int lessfs_rename(const char *from, const char *to)
{
int res = 0;
struct stat stbuf;
FUNC;
LDEBUG("lessfs_rename : from %s , to %s", from, to);
if (config->replication == 1 && config->replication_role == 1) {
return (-EPERM);
}
get_global_lock((char *) __PRETTY_FUNCTION__);
res = dbstat(from, &stbuf, 0);
if (res == 0) {
update_filesize_onclose(stbuf.st_ino);
if (stbuf.st_nlink > 1 && !S_ISDIR(stbuf.st_mode)) {
res = fs_rename_link(from, to, stbuf);
} else {
res = fs_rename(from, to, stbuf);
}
}
if (S_ISDIR(stbuf.st_mode)) {
erase_p2i();
} else {
invalidate_p2i((char *) from);
invalidate_p2i((char *) to);
}
release_global_lock();
return (res);
}
static int lessfs_link(const char *from, const char *to)
{
int res = 0;
FUNC;
if (config->replication == 1 && config->replication_role == 1) {
return (-EPERM);
}
get_global_lock((char *) __PRETTY_FUNCTION__);
res = fs_link((char *) from, (char *) to);
release_global_lock();
return (res);
}
static int lessfs_chmod(const char *path, mode_t mode)
{
int res;
time_t thetime;
struct stat stbuf;
const char *data;
int vsize;
MEMDDSTAT *memddstat;
DAT *ddbuf;
FUNC;
if (config->replication == 1 && config->replication_role == 1) {
LFATAL("lessfs_chmod");
return (-EPERM);
}
LDEBUG("lessfs_chmod : %s", path);
get_global_lock((char *) __PRETTY_FUNCTION__);
thetime = time(NULL);
res = dbstat(path, &stbuf, 0);
if (res != 0)
return (res);
// Since we use the stickybit to indicate that the file is locked
// during truncation and deletion we do not allow
// to be set on a regular file in this situation.
if (config->sticky_on_locked && S_ISREG(stbuf.st_mode)) {
if (S_ISVTX == (S_ISVTX & stbuf.st_mode)) {
stbuf.st_mode = stbuf.st_mode ^ S_ISVTX;
}
}
meta_lock((char *) __PRETTY_FUNCTION__);
data = tctreeget(metatree, &stbuf.st_ino,
sizeof(unsigned long long), &vsize);
if (data) {
memddstat = (MEMDDSTAT *) data;
memddstat->stbuf.st_ctim.tv_sec = thetime;
memddstat->stbuf.st_ctim.tv_nsec = 0;
memddstat->stbuf.st_mode = mode;
memddstat->updated = 1;
ddbuf = create_mem_ddbuf(memddstat);
tctreeput(metatree, &stbuf.st_ino,
sizeof(unsigned long long), (void *) ddbuf->data,
ddbuf->size);
cache_p2i((char *) path, &memddstat->stbuf);
release_meta_lock();
DATfree(ddbuf);
} else {
stbuf.st_mode = mode;
stbuf.st_ctim.tv_sec = thetime;
stbuf.st_ctim.tv_nsec = 0;
release_meta_lock();
res = update_stat((char *) path, &stbuf);
}
release_global_lock();
return (res);
}
static int lessfs_chown(const char *path, uid_t uid, gid_t gid)
{
int res;
time_t thetime;
struct stat stbuf;
const char *data;
int vsize;
MEMDDSTAT *memddstat;
DAT *ddbuf;
FUNC;
if (config->replication == 1 && config->replication_role == 1) {
return (-EPERM);
}
get_global_lock((char *) __PRETTY_FUNCTION__);
thetime = time(NULL);
invalidate_p2i((char *) path);
res = dbstat(path, &stbuf, 0);
if (res != 0)
goto end_unlock;
meta_lock((char *) __PRETTY_FUNCTION__);
data = tctreeget(metatree, &stbuf.st_ino,
sizeof(unsigned long long), &vsize);
if (data) {
memddstat = (MEMDDSTAT *) data;
memddstat->stbuf.st_ctim.tv_sec = thetime;
memddstat->stbuf.st_ctim.tv_nsec = 0;
memddstat->stbuf.st_uid = uid;
memddstat->stbuf.st_gid = gid;
memddstat->updated = 1;
ddbuf = create_mem_ddbuf(memddstat);
tctreeput(metatree, &stbuf.st_ino,
sizeof(unsigned long long), (void *) ddbuf->data,
ddbuf->size);
cache_p2i((char *) path, &memddstat->stbuf);
release_meta_lock();
DATfree(ddbuf);
} else {
if (-1 != uid)
stbuf.st_uid = uid;
if (-1 != gid)
stbuf.st_gid = gid;
stbuf.st_ctim.tv_sec = thetime;
stbuf.st_ctim.tv_nsec = 0;
release_meta_lock();
res = update_stat((char *) path, &stbuf);
}
end_unlock:
release_global_lock();
return (res);
}
static int lessfs_truncate(const char *path, off_t size)
{
int res = 0;
struct stat *stbuf;
char *bname;
if (config->replication == 1 && config->replication_role == 1) {
if (0 != strcmp(path, "/.lessfs/replication/enabled"))
return (-EPERM);
}
if (0 == strcmp(path, "/.lessfs/replication/sequence"))
return (-EPERM);
LDEBUG("lessfs_truncate : %s truncate to %llu", path, size);
get_global_lock((char *) __PRETTY_FUNCTION__);
bname = s_basename((char *) path);
stbuf = s_malloc(sizeof(struct stat));
res = dbstat(path, stbuf, 0);
if (res != 0) {
release_global_lock();
s_free(stbuf);
return (res);
}
if (S_ISDIR(stbuf->st_mode)) {
release_global_lock();
s_free(stbuf);
return (-EISDIR);
}
/* Flush the blockcache before we continue. */
create_inode_note(stbuf->st_ino);
write_lock((char *) __PRETTY_FUNCTION__);
flush_wait(stbuf->st_ino);
purge_read_cache(stbuf->st_ino, 1, (char *) __PRETTY_FUNCTION__);
if (size < stbuf->st_size) {
if (config->blockdatabs) {
res = db_fs_truncate(stbuf, size, bname, 0);
} else {
res = file_fs_truncate(stbuf, size, bname, 0);
}
} else {
LDEBUG("lessfs_truncate : %s only change size to %llu", path,
size);
update_filesize_cache(stbuf, size);
delete_inode_note(stbuf->st_ino);
}
invalidate_p2i((char *) path);
release_write_lock();
s_free(stbuf);
s_free(bname);
release_global_lock();
if (config->nospace == ENOSPC)
config->nospace = -ENOSPC;
return (res);
}
static int lessfs_utimens(const char *path, const struct timespec ts[2])
{
int res = 0;
struct stat stbuf;
DDSTAT *ddstat;
DAT *ddbuf;
DAT *dskdata;
const char *data;
int vsize;
MEMDDSTAT *memddstat;
FUNC;
get_global_lock((char *) __PRETTY_FUNCTION__);
res = dbstat(path, &stbuf, 0);
if (res != 0)
goto out;
data = tctreeget(metatree, &stbuf.st_ino,
sizeof(unsigned long long), &vsize);
if (data) {
memddstat = (MEMDDSTAT *) data;
memddstat->stbuf.st_atim.tv_sec = ts[0].tv_sec;
memddstat->stbuf.st_atim.tv_nsec = ts[0].tv_nsec;
memddstat->stbuf.st_mtim.tv_sec = ts[1].tv_sec;
memddstat->stbuf.st_mtim.tv_nsec = ts[1].tv_nsec;
memddstat->updated = 1;
ddbuf = create_mem_ddbuf(memddstat);
tctreeput(metatree, &stbuf.st_ino,
sizeof(unsigned long long), (void *) ddbuf->data,
ddbuf->size);
cache_p2i((char *) path, &memddstat->stbuf);
DATfree(ddbuf);
} else {
dskdata =
search_dbdata(DBP, &stbuf.st_ino, sizeof(unsigned long long),
LOCK);
if (dskdata == NULL) {
#ifdef x86_64
die_dataerr("Failed to find file %lu", stbuf.st_ino);
#else
die_dataerr("Failed to find file %llu", stbuf.st_ino);
#endif
}
ddstat = value_to_ddstat(dskdata);
ddstat->stbuf.st_atim.tv_sec = ts[0].tv_sec;
ddstat->stbuf.st_atim.tv_nsec = ts[0].tv_nsec;
ddstat->stbuf.st_mtim.tv_sec = ts[1].tv_sec;
ddstat->stbuf.st_mtim.tv_nsec = ts[1].tv_nsec;
ddbuf =
create_ddbuf(ddstat->stbuf, ddstat->filename,
ddstat->real_size);
bin_write_dbdata(DBP, &stbuf.st_ino, sizeof(unsigned long long),
(void *) ddbuf->data, ddbuf->size);
cache_p2i((char *) path, &ddstat->stbuf);
DATfree(dskdata);
DATfree(ddbuf);
ddstatfree(ddstat);
}
out:
release_global_lock();
return (res);
}
unsigned long long get_real_size(unsigned long long inode)
{
DAT *data;
DDSTAT *ddstat;
unsigned long long real_size = 0;
data = search_dbdata(DBP, &inode, sizeof(unsigned long long), LOCK);
if (NULL == data) {
return (real_size);
}
ddstat = value_to_ddstat(data);
DATfree(data);
real_size = ddstat->real_size;
ddstatfree(ddstat);
return (real_size);
}
static int lessfs_open(const char *path, struct fuse_file_info *fi)
{
struct stat stbuf;
char *bname;
DAT *ddbuf;
const char *dataptr;
unsigned long long blocknr = 0;
MEMDDSTAT *memddstat;
unsigned long long inode;
int vsize;
int res = 0;
FUNC;
LDEBUG("lessfs_open : %s strlen %i : uid %u", path,
strlen((char *) path), fuse_get_context()->uid);
get_global_lock((char *) __PRETTY_FUNCTION__);
res = dbstat(path, &stbuf, 0);
if (res == -ENOENT) {
fi->fh = 0;
stbuf.st_mode = fi->flags;
stbuf.st_uid = fuse_get_context()->uid;
stbuf.st_gid = fuse_get_context()->gid;
LDEBUG("lessfs_open %s is a new file", path);
} else {
fi->fh = stbuf.st_ino;
inode = stbuf.st_ino;
bname = s_basename((char *) path);
// Check if we have already something in cache for this inode
meta_lock((char *) __PRETTY_FUNCTION__);
dataptr =
tctreeget(metatree, &stbuf.st_ino,
sizeof(unsigned long long), &vsize);
if (dataptr == NULL) {
blocknr--; /* Invalid block in cache */
// Initialize the cache
memddstat = s_malloc(sizeof(MEMDDSTAT));
memcpy(&memddstat->stbuf, &stbuf, sizeof(struct stat));
memcpy(&memddstat->filename, bname, strlen(bname) + 1);
memddstat->blocknr = blocknr;
memddstat->updated = 0;
memddstat->real_size = get_real_size(stbuf.st_ino);
memddstat->opened = 1;
memddstat->stbuf.st_atim.tv_sec = time(NULL);
memddstat->stbuf.st_atim.tv_nsec = 0;
LDEBUG("lessfs_open : initial open memddstat->opened = %u",
memddstat->opened);
LDEBUG("memddstat->stbuf.st_atim.tv_sec = %lu",
memddstat->stbuf.st_atim.tv_sec);
ddbuf = create_mem_ddbuf(memddstat);
tctreeput(metatree, &inode, sizeof(unsigned long long),
(void *) ddbuf->data, ddbuf->size);
DATfree(ddbuf);
memddstatfree(memddstat);
} else {
memddstat = (MEMDDSTAT *) dataptr;
memddstat->opened++;
memddstat->stbuf.st_atim.tv_sec = time(NULL);
memddstat->stbuf.st_atim.tv_nsec = 0;
LDEBUG("lessfs_open : repeated open ddstat->opened = %u %lu",
memddstat->opened, memddstat->stbuf.st_atim.tv_sec);
ddbuf = create_mem_ddbuf(memddstat);
tctreeput(metatree, &inode, sizeof(unsigned long long),
(void *) ddbuf->data, ddbuf->size);
DATfree(ddbuf);
}
release_meta_lock();
s_free(bname);
}
release_global_lock();
EFUNC;
return (res);
}
static int lessfs_read(const char *path, char *buf, size_t size,
off_t offset, struct fuse_file_info *fi)
{
unsigned long long blocknr;
size_t done = 0;
size_t got = 0;
size_t block_offset = 0;
struct stat stbuf;
unsigned long sequence;
FUNC;
get_global_lock((char *) __PRETTY_FUNCTION__);
write_lock((char *) __PRETTY_FUNCTION__);
memset(buf, 0, size);
LDEBUG("lessfs_read called offset : %llu, size bytes %llu",
(unsigned long long) offset, (unsigned long long) size);
if (fi->fh == 10) {
strncpy(buf, &config->lfsstats[offset], size);
done = size;
goto end_error;
}
if (fi->fh == 14) {
sprintf(buf, "%i\n", config->replication_enabled);
done = size;
goto end_error;
}
if (fi->fh == 15) {
sprintf(buf, "%i\n", config->replication_backlog);
done = size;
goto end_error;
}
if (fi->fh == 16) {
sequence = get_sequence();
memset(buf, 0, size);
sprintf(buf, "%lu\n", sequence);
done = size;
goto end_error;
}
if (fi->fh == 17) {
sprintf(buf, "%u\n", 0);
done = size;
goto end_error;
}
// Change this to creating a buffer that is allocated once.
// Disable reads beyond EOF
if (get_realsize_fromcache(fi->fh, &stbuf)) {
LDEBUG("lessfs_read : get_realsize_fromcache returns %llu",
(unsigned long long) stbuf.st_size);
if (offset + size > stbuf.st_size) {
if (offset > stbuf.st_size)
goto end_error;
size = stbuf.st_size - offset;
}
}
while (done < size) {
blocknr = (offset + done) / BLKSIZE;
block_offset = (done + offset) - (blocknr * BLKSIZE);
if (config->blockdatabs) {
got =
readBlock(blocknr, buf + done, size - done, block_offset,
fi->fh);
} else {
got =
file_read_block(blocknr, buf + done, size - done,
block_offset, fi->fh);
}
done = done + BLKSIZE - block_offset;
if (done > size)
done = size;
}
end_error:
release_write_lock();
release_global_lock();
return (done);
}
CCACHEDTA *update_stored(unsigned char *hash, INOBNO * inobno,
off_t offsetblock)
{
DAT *data;
DAT *uncompdata;
CCACHEDTA *ccachedta;
ccachedta = s_zmalloc(sizeof(CCACHEDTA));
ccachedta->creationtime = time(NULL);
ccachedta->dirty = 1;
ccachedta->pending = 0;
ccachedta->newblock = 0;
data = search_dbdata(DBDTA, hash, config->hashlen, LOCK);
if (NULL == data) {
s_free(ccachedta);
return NULL;
}
uncompdata = lfsdecompress(data);
LDEBUG("got uncompsize : %lu", uncompdata->size);
memcpy(&ccachedta->data, uncompdata->data, uncompdata->size);
ccachedta->datasize = uncompdata->size;
ccachedta->updated = data->size;
DATfree(uncompdata);
DATfree(data);
db_delete_stored(inobno);
EFUNC;
return ccachedta;
}
void add2cache(INOBNO * inobno, const char *buf, off_t offsetblock,
size_t bsize)
{
CCACHEDTA *ccachedta;
uintptr_t p;
int size;
char *key;
DAT *data;
bool found = 0;
pending:
write_lock((char *) __PRETTY_FUNCTION__);
key =
(char *) tctreeget(readcachetree, (void *) inobno, sizeof(INOBNO),
&size);
if (key) {
memcpy(&p, key, size);
ccachedta = get_ccachedta(p);
while (ccachedta->pending == 1) {
release_write_lock();
goto pending;
}
ccachedta->creationtime = time(NULL);
ccachedta->dirty = 1;
memcpy((void *) &ccachedta->data[offsetblock], buf, bsize);
if (ccachedta->datasize < offsetblock + bsize)
ccachedta->datasize = offsetblock + bsize;
update_filesize(inobno->inode, bsize, offsetblock,
inobno->blocknr);
release_write_lock();
return;
}
update_filesize(inobno->inode, bsize, offsetblock, inobno->blocknr);
if (bsize < BLKSIZE) {
data = check_block_exists(inobno);
if (data) {
create_hash_note(data->data);
if (NULL == config->blockdatabs) {
ccachedta =
file_update_stored(data->data, inobno, offsetblock);
} else {
ccachedta =
update_stored((unsigned char *) data->data, inobno,
offsetblock);
}
delete_hash_note(data->data);
if (ccachedta) {
memcpy(&ccachedta->data[offsetblock], buf, bsize);
if (ccachedta->datasize < offsetblock + bsize)
ccachedta->datasize = offsetblock + bsize;
found = 1;
}
DATfree(data);
}
}
if (!found) {
ccachedta = s_zmalloc(sizeof(CCACHEDTA));
memcpy(&ccachedta->data[offsetblock], buf, bsize);
ccachedta->datasize = offsetblock + bsize;
ccachedta->creationtime = time(NULL);
ccachedta->dirty = 1;
ccachedta->pending = 0;
ccachedta->newblock = 1;
}
if (tctreernum(workqtree) * 2 > config->cachesize ||
tctreernum(readcachetree) * 2 > config->cachesize) {
flush_wait(0);
purge_read_cache(0, 1, (char *) __PRETTY_FUNCTION__);
}
p = (uintptr_t) ccachedta;
// A full block can be processed right away.
if (bsize == BLKSIZE) {
ccachedta->pending = 1;
tctreeput(workqtree, (void *) inobno, sizeof(INOBNO), (void *) &p,
sizeof(p));
}
// When this is not a full block a separate thread is used.
tctreeput(readcachetree, (void *) inobno, sizeof(INOBNO), (void *) &p,
sizeof(p));
release_write_lock();
return;
}
void flush_rotate_replog()
{
write_lock((char *) __PRETTY_FUNCTION__);
flush_wait(0);
purge_read_cache(0, 1, (char *) __PRETTY_FUNCTION__);
if ( config->blockdata_io_type == CHUNK_IO ) sync();
start_flush_commit();
end_flush_commit();
config->replication_last_rotated = time(NULL);
rotate_replog();
release_repl_lock();
release_write_lock();
}
static int lessfs_write(const char *path, const char *buf, size_t size,
off_t offset, struct fuse_file_info *fi)
{
off_t offsetblock;
size_t bsize;
size_t done = 0;
INOBNO inobno;
FUNC;
if (config->nospace == ENOSPC)
return (-ENOSPC);
wait_inode_pending2(fi->fh);
get_global_lock((char *) __PRETTY_FUNCTION__);
if (fi->fh == 14) {
if (0 == memcmp(buf, "0", 1)) {
LINFO("Replication is now disabled");
config->replication_enabled = 0;
}
if (0 == memcmp(buf, "1", 1)) {
LINFO("Replication is now enabled");
config->replication_enabled = 1;
}
goto end_exit;
}
if (fi->fh == 16) {
size = -EPERM;
goto end_exit;
}
if (fi->fh == 17) {
if (config->replication == 1 && config->replication_role == 0) {
if (0 == memcmp(buf, "1", 1)) {
LINFO("Rotated replog after receiving rotation request");
flush_rotate_replog();
}
} else size = -EPERM;
goto end_exit;
}
if (config->replication == 1 && config->replication_role == 1) {
size = -EPERM;
goto end_exit;
}
LDEBUG("lessfs_write offset %llu size %lu", offset,
(unsigned long) size);
inobno.inode = fi->fh;