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FuseStore.cc
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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
#include "include/compat.h"
#include "include/ceph_fuse.h"
#include "FuseStore.h"
#include "os/ObjectStore.h"
#include "include/stringify.h"
#include "common/errno.h"
#include <fuse_lowlevel.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h> /* Definition of AT_* constants */
#include <sys/stat.h>
#if defined(__APPLE__) || defined(__FreeBSD__)
#include <sys/param.h>
#include <sys/mount.h>
#endif
#define dout_context store->cct
#define dout_subsys ceph_subsys_fuse
#include "common/debug.h"
#undef dout_prefix
#define dout_prefix *_dout << "fuse "
using std::less;
using std::list;
using std::map;
using std::set;
using std::string;
using std::vector;
using ceph::bufferlist;
using ceph::bufferptr;
// some fuse-y bits of state
struct fs_info {
struct fuse_args args;
struct fuse *f;
#if FUSE_VERSION < FUSE_MAKE_VERSION(3, 0)
struct fuse_chan *ch;
#endif
char *mountpoint;
};
int FuseStore::open_file(string p, struct fuse_file_info *fi,
std::function<int(bufferlist *bl)> f)
{
if (open_files.count(p)) {
OpenFile *o = open_files[p];
fi->fh = reinterpret_cast<uint64_t>(o);
++o->ref;
return 0;
}
bufferlist bl;
int r = f(&bl);
if (r < 0) {
return r;
}
OpenFile *o = new OpenFile;
o->path = p;
o->bl = std::move(bl);
open_files[p] = o;
fi->fh = reinterpret_cast<uint64_t>(o);
++o->ref;
return 0;
}
FuseStore::FuseStore(ObjectStore *s, string p)
: store(s),
mount_point(p),
fuse_thread(this)
{
info = new fs_info();
}
FuseStore::~FuseStore()
{
delete info;
}
/*
* / - root directory
* $cid/
* $cid/type - objectstore type
* $cid/bitwise_hash_start = lowest hash value
* $cid/bitwise_hash_end = highest hash value
* $cid/bitwise_hash_bits - how many bits are significant
* $cid/pgmeta/ - pgmeta object
* $cid/all/ - all objects
* $cid/all/$obj/
* $cid/all/$obj/bitwise_hash
* $cid/all/$obj/data
* $cid/all/$obj/omap/$key
* $cid/all/$obj/attr/$name
* $cid/by_bitwise_hash/$hash/$bits/$obj - all objects with this (bitwise) hash (prefix)
*/
enum {
FN_ROOT = 1,
FN_TYPE,
FN_COLLECTION,
FN_HASH_START,
FN_HASH_END,
FN_HASH_BITS,
FN_OBJECT,
FN_OBJECT_HASH,
FN_OBJECT_DATA,
FN_OBJECT_OMAP_HEADER,
FN_OBJECT_OMAP,
FN_OBJECT_OMAP_VAL,
FN_OBJECT_ATTR,
FN_OBJECT_ATTR_VAL,
FN_ALL,
FN_HASH_DIR,
FN_HASH_VAL,
};
static int parse_fn(CephContext* cct, const char *path, coll_t *cid,
ghobject_t *oid, string *key,
uint32_t *hash, uint32_t *hash_bits)
{
list<string> v;
for (const char *p = path; *p; ++p) {
if (*p == '/')
continue;
const char *e;
for (e = p + 1; *e && *e != '/'; e++) ;
string c(p, e-p);
v.push_back(c);
p = e;
if (!*p)
break;
}
ldout(cct, 10) << __func__ << " path " << path << " -> " << v << dendl;
if (v.empty())
return FN_ROOT;
if (v.front() == "type")
return FN_TYPE;
if (!cid->parse(v.front())) {
return -ENOENT;
}
if (v.size() == 1)
return FN_COLLECTION;
v.pop_front();
if (v.front() == "bitwise_hash_start")
return FN_HASH_START;
if (v.front() == "bitwise_hash_end")
return FN_HASH_END;
if (v.front() == "bitwise_hash_bits")
return FN_HASH_BITS;
if (v.front() == "pgmeta") {
spg_t pgid;
if (cid->is_pg(&pgid)) {
*oid = pgid.make_pgmeta_oid();
v.pop_front();
if (v.empty())
return FN_OBJECT;
goto do_object;
}
return -ENOENT;
}
if (v.front() == "all") {
v.pop_front();
if (v.empty())
return FN_ALL;
goto do_dir;
}
if (v.front() == "by_bitwise_hash") {
v.pop_front();
if (v.empty())
return FN_HASH_DIR;
unsigned long hv, hm;
int r = sscanf(v.front().c_str(), "%lx", &hv);
if (r != 1)
return -ENOENT;
int shift = 32 - v.front().length() * 4;
v.pop_front();
if (v.empty())
return FN_HASH_DIR;
r = sscanf(v.front().c_str(), "%ld", &hm);
if (r != 1)
return -ENOENT;
if (hm < 1 || hm > 32)
return -ENOENT;
v.pop_front();
*hash = hv << shift;//hobject_t::_reverse_bits(hv << shift);
*hash_bits = hm;
if (v.empty())
return FN_HASH_VAL;
goto do_dir;
}
return -ENOENT;
do_dir:
{
string o = v.front();
if (!oid->parse(o)) {
return -ENOENT;
}
v.pop_front();
if (v.empty())
return FN_OBJECT;
}
do_object:
if (v.front() == "data")
return FN_OBJECT_DATA;
if (v.front() == "omap_header")
return FN_OBJECT_OMAP_HEADER;
if (v.front() == "omap") {
v.pop_front();
if (v.empty())
return FN_OBJECT_OMAP;
*key = v.front();
v.pop_front();
if (v.empty())
return FN_OBJECT_OMAP_VAL;
return -ENOENT;
}
if (v.front() == "attr") {
v.pop_front();
if (v.empty())
return FN_OBJECT_ATTR;
*key = v.front();
v.pop_front();
if (v.empty())
return FN_OBJECT_ATTR_VAL;
return -ENOENT;
}
if (v.front() == "bitwise_hash")
return FN_OBJECT_HASH;
return -ENOENT;
}
static int os_getattr(const char *path, struct stat *stbuf
#if FUSE_VERSION >= FUSE_MAKE_VERSION(3, 0)
, struct fuse_file_info *fi
#endif
)
{
fuse_context *fc = fuse_get_context();
FuseStore *fs = static_cast<FuseStore*>(fc->private_data);
ldout(fs->store->cct, 10) << __func__ << " " << path << dendl;
coll_t cid;
ghobject_t oid;
string key;
uint32_t hash_value, hash_bits;
int t = parse_fn(fs->store->cct, path, &cid, &oid, &key, &hash_value,
&hash_bits);
if (t < 0)
return t;
std::lock_guard<std::mutex> l(fs->lock);
stbuf->st_size = 0;
stbuf->st_uid = 0;
stbuf->st_gid = 0;
stbuf->st_mode = S_IFREG | 0700;
auto ch = fs->store->open_collection(cid);
switch (t) {
case FN_OBJECT_OMAP:
case FN_OBJECT_ATTR:
case FN_OBJECT:
case FN_OBJECT_DATA:
case FN_OBJECT_OMAP_HEADER:
case FN_OBJECT_OMAP_VAL:
{
spg_t pgid;
if (cid.is_pg(&pgid)) {
if (!ch) {
return -ENOENT;
}
int bits = fs->store->collection_bits(ch);
if (bits >= 0 && !oid.match(bits, pgid.ps())) {
// sorry, not part of this PG
return -ENOENT;
}
}
}
break;
}
switch (t) {
case FN_OBJECT_OMAP:
case FN_OBJECT_ATTR:
case FN_OBJECT:
if (!fs->store->exists(ch, oid))
return -ENOENT;
// fall-thru
case FN_ALL:
case FN_HASH_DIR:
case FN_HASH_VAL:
case FN_COLLECTION:
if (!fs->store->collection_exists(cid))
return -ENOENT;
// fall-thru
case FN_ROOT:
stbuf->st_mode = S_IFDIR | 0700;
return 0;
case FN_TYPE:
stbuf->st_size = fs->store->get_type().length() + 1;
break;
case FN_OBJECT_HASH:
if (!fs->store->exists(ch, oid))
return -ENOENT;
stbuf->st_size = 9;
return 0;
case FN_HASH_END:
if (!ch)
return -ENOENT;
if (fs->store->collection_bits(ch) < 0)
return -ENOENT;
// fall-thru
case FN_HASH_START:
stbuf->st_size = 9;
return 0;
case FN_HASH_BITS:
{
if (!ch)
return -ENOENT;
int bits = fs->store->collection_bits(ch);
if (bits < 0)
return -ENOENT;
char buf[12];
snprintf(buf, sizeof(buf), "%d\n", bits);
stbuf->st_size = strlen(buf);
}
return 0;
case FN_OBJECT_DATA:
{
if (!fs->store->exists(ch, oid))
return -ENOENT;
int r = fs->store->stat(ch, oid, stbuf);
if (r < 0)
return r;
}
break;
case FN_OBJECT_OMAP_HEADER:
{
if (!fs->store->exists(ch, oid))
return -ENOENT;
bufferlist bl;
fs->store->omap_get_header(ch, oid, &bl);
stbuf->st_size = bl.length();
}
break;
case FN_OBJECT_OMAP_VAL:
{
if (!fs->store->exists(ch, oid))
return -ENOENT;
set<string> k;
k.insert(key);
map<string,bufferlist> v;
fs->store->omap_get_values(ch, oid, k, &v);
if (!v.count(key)) {
return -ENOENT;
}
stbuf->st_size = v[key].length();
}
break;
case FN_OBJECT_ATTR_VAL:
{
if (!fs->store->exists(ch, oid))
return -ENOENT;
bufferptr v;
int r = fs->store->getattr(ch, oid, key.c_str(), v);
if (r == -ENODATA)
r = -ENOENT;
if (r < 0)
return r;
stbuf->st_size = v.length();
}
break;
default:
return -ENOENT;
}
return 0;
}
static int os_readdir(const char *path,
void *buf,
fuse_fill_dir_t filler,
off_t offset,
struct fuse_file_info *fi
#if FUSE_VERSION >= FUSE_MAKE_VERSION(3, 0)
, enum fuse_readdir_flags
#endif
)
{
fuse_context *fc = fuse_get_context();
FuseStore *fs = static_cast<FuseStore*>(fc->private_data);
ldout(fs->store->cct, 10) << __func__ << " " << path << " offset " << offset
<< dendl;
coll_t cid;
ghobject_t oid;
string key;
uint32_t hash_value, hash_bits;
int t = parse_fn(fs->store->cct, path, &cid, &oid, &key, &hash_value,
&hash_bits);
if (t < 0)
return t;
std::lock_guard<std::mutex> l(fs->lock);
auto ch = fs->store->open_collection(cid);
// we can't shift 32 bits or else off_t will go negative
const int hash_shift = 31;
switch (t) {
case FN_ROOT:
{
filler_compat(filler, buf, "type", NULL, 0);
vector<coll_t> cls;
fs->store->list_collections(cls);
for (auto c : cls) {
int r = filler_compat(filler, buf, stringify(c).c_str(), NULL, 0);
if (r > 0)
break;
}
}
break;
case FN_COLLECTION:
{
if (!ch) {
return -ENOENT;
}
filler_compat(filler, buf, "bitwise_hash_start", NULL, 0);
if (fs->store->collection_bits(ch) >= 0) {
filler_compat(filler, buf, "bitwise_hash_end", NULL, 0);
filler_compat(filler, buf, "bitwise_hash_bits", NULL, 0);
}
filler_compat(filler, buf, "all", NULL, 0);
filler_compat(filler, buf, "by_bitwise_hash", NULL, 0);
spg_t pgid;
if (cid.is_pg(&pgid) &&
fs->store->exists(ch, pgid.make_pgmeta_oid())) {
filler_compat(filler, buf, "pgmeta", NULL, 0);
}
}
break;
case FN_OBJECT:
{
filler_compat(filler, buf, "bitwise_hash", NULL, 0);
filler_compat(filler, buf, "data", NULL, 0);
filler_compat(filler, buf, "omap", NULL, 0);
filler_compat(filler, buf, "attr", NULL, 0);
filler_compat(filler, buf, "omap_header", NULL, 0);
}
break;
case FN_HASH_VAL:
case FN_ALL:
{
uint32_t bitwise_hash = (offset >> hash_shift) & 0xffffffff;
uint32_t hashoff = offset - (bitwise_hash << hash_shift);
int skip = hashoff;
ghobject_t next = cid.get_min_hobj();
if (offset) {
// obey the offset
next.hobj.set_hash(hobject_t::_reverse_bits(bitwise_hash));
} else if (t == FN_HASH_VAL) {
next.hobj.set_hash(hobject_t::_reverse_bits(hash_value));
}
ghobject_t last;
if (t == FN_HASH_VAL) {
last = next;
uint64_t rev_end = (hash_value | (0xffffffff >> hash_bits)) + 1;
if (rev_end >= 0x100000000)
last = ghobject_t::get_max();
else
last.hobj.set_hash(hobject_t::_reverse_bits(rev_end));
} else {
last = ghobject_t::get_max();
}
ldout(fs->store->cct, 10) << __func__ << std::hex
<< " offset " << offset << " hash "
<< hobject_t::_reverse_bits(hash_value)
<< std::dec
<< "/" << hash_bits
<< " first " << next << " last " << last
<< dendl;
while (true) {
vector<ghobject_t> ls;
int r = fs->store->collection_list(
ch, next, last, 1000, &ls, &next);
if (r < 0)
return r;
for (auto p : ls) {
if (skip) {
--skip;
continue;
}
uint32_t cur_bitwise_hash = p.hobj.get_bitwise_key_u32();
if (cur_bitwise_hash != bitwise_hash) {
bitwise_hash = cur_bitwise_hash;
hashoff = 0;
}
++hashoff;
uint64_t cur_off = ((uint64_t)bitwise_hash << hash_shift) |
(uint64_t)hashoff;
string s = stringify(p);
r = filler_compat(filler, buf, s.c_str(), NULL, cur_off);
if (r)
break;
}
if (r)
break;
if (next == ghobject_t::get_max() || next == last)
break;
}
}
break;
case FN_OBJECT_OMAP:
{
set<string> keys;
fs->store->omap_get_keys(ch, oid, &keys);
unsigned skip = offset;
for (auto k : keys) {
if (skip) {
--skip;
continue;
}
++offset;
int r = filler_compat(filler, buf, k.c_str(), NULL, offset);
if (r)
break;
}
}
break;
case FN_OBJECT_ATTR:
{
map<string,bufferptr,less<>> aset;
fs->store->getattrs(ch, oid, aset);
unsigned skip = offset;
for (auto a : aset) {
if (skip) {
--skip;
continue;
}
++offset;
int r = filler_compat(filler, buf, a.first.c_str(), NULL, offset);
if (r)
break;
}
}
break;
}
return 0;
}
static int os_open(const char *path, struct fuse_file_info *fi)
{
fuse_context *fc = fuse_get_context();
FuseStore *fs = static_cast<FuseStore*>(fc->private_data);
ldout(fs->store->cct, 10) << __func__ << " " << path << dendl;
coll_t cid;
ghobject_t oid;
string key;
uint32_t hash_value, hash_bits;
int t = parse_fn(fs->store->cct, path, &cid, &oid, &key, &hash_value,
&hash_bits);
if (t < 0)
return t;
std::lock_guard<std::mutex> l(fs->lock);
auto ch = fs->store->open_collection(cid);
bufferlist *pbl = 0;
switch (t) {
case FN_TYPE:
pbl = new bufferlist;
pbl->append(fs->store->get_type());
pbl->append("\n");
break;
case FN_HASH_START:
{
pbl = new bufferlist;
spg_t pgid;
if (cid.is_pg(&pgid)) {
unsigned long h;
h = hobject_t::_reverse_bits(pgid.ps());
char buf[10];
snprintf(buf, sizeof(buf), "%08lx\n", h);
pbl->append(buf);
} else {
pbl->append("00000000\n");
}
}
break;
case FN_HASH_END:
{
if (!ch) {
return -ENOENT;
}
spg_t pgid;
unsigned long h;
if (cid.is_pg(&pgid)) {
int hash_bits = fs->store->collection_bits(ch);
if (hash_bits >= 0) {
uint64_t rev_start = hobject_t::_reverse_bits(pgid.ps());
uint64_t rev_end = (rev_start | (0xffffffff >> hash_bits));
h = rev_end;
} else {
return -ENOENT;
}
} else {
h = 0xffffffff;
}
char buf[10];
snprintf(buf, sizeof(buf), "%08lx\n", h);
pbl = new bufferlist;
pbl->append(buf);
}
break;
case FN_HASH_BITS:
{
if (!ch) {
return -ENOENT;
}
int r = fs->store->collection_bits(ch);
if (r < 0)
return r;
char buf[12];
snprintf(buf, sizeof(buf), "%d\n", r);
pbl = new bufferlist;
pbl->append(buf);
}
break;
case FN_OBJECT_HASH:
{
pbl = new bufferlist;
char buf[10];
snprintf(buf, sizeof(buf), "%08x\n",
(unsigned)oid.hobj.get_bitwise_key_u32());
pbl->append(buf);
}
break;
case FN_OBJECT_DATA:
{
int r = fs->open_file(
path, fi,
[&](bufferlist *pbl) {
return fs->store->read(ch, oid, 0, 0, *pbl);
});
if (r < 0) {
return r;
}
}
break;
case FN_OBJECT_ATTR_VAL:
{
int r = fs->open_file(
path, fi,
[&](bufferlist *pbl) {
bufferptr bp;
int r = fs->store->getattr(ch, oid, key.c_str(), bp);
if (r < 0)
return r;
pbl->append(bp);
return 0;
});
if (r < 0)
return r;
}
break;
case FN_OBJECT_OMAP_VAL:
{
int r = fs->open_file(
path, fi,
[&](bufferlist *pbl) {
set<string> k;
k.insert(key);
map<string,bufferlist> v;
int r = fs->store->omap_get_values(ch, oid, k, &v);
if (r < 0)
return r;
*pbl = v[key];
return 0;
});
if (r < 0)
return r;
}
break;
case FN_OBJECT_OMAP_HEADER:
{
int r = fs->open_file(
path, fi,
[&](bufferlist *pbl) {
return fs->store->omap_get_header(ch, oid, pbl);
});
if (r < 0)
return r;
}
break;
}
if (pbl) {
FuseStore::OpenFile *o = new FuseStore::OpenFile;
o->bl = std::move(*pbl);
fi->fh = reinterpret_cast<uint64_t>(o);
}
return 0;
}
static int os_mkdir(const char *path, mode_t mode)
{
fuse_context *fc = fuse_get_context();
FuseStore *fs = static_cast<FuseStore*>(fc->private_data);
ldout(fs->store->cct, 10) << __func__ << " " << path << dendl;
coll_t cid;
ghobject_t oid;
string key;
uint32_t hash_value, hash_bits;
int f = parse_fn(fs->store->cct, path, &cid, &oid, &key, &hash_value,
&hash_bits);
if (f < 0)
return f;
std::lock_guard<std::mutex> l(fs->lock);
ObjectStore::CollectionHandle ch;
ObjectStore::Transaction t;
switch (f) {
case FN_OBJECT:
{
ch = fs->store->open_collection(cid);
if (!ch) {
return -ENOENT;
}
spg_t pgid;
if (cid.is_pg(&pgid)) {
int bits = fs->store->collection_bits(ch);
if (bits >= 0 && !oid.match(bits, pgid.ps())) {
// sorry, not part of this PG
return -EINVAL;
}
}
t.touch(cid, oid);
ch = fs->store->open_collection(cid);
}
break;
case FN_COLLECTION:
if (cid.is_pg()) {
// use the mode for the bit count. e.g., mkdir --mode=0003
// mnt/0.7_head will create 0.7 with bits = 3.
mode &= 0777;
if (mode >= 32)
return -EINVAL;
} else {
mode = 0;
}
t.create_collection(cid, mode);
ch = fs->store->create_new_collection(cid);
break;
default:
return -EPERM;
}
if (!t.empty()) {
fs->store->queue_transaction(ch, std::move(t));
}
return 0;
}
static int os_chmod(const char *path, mode_t mode
#if FUSE_VERSION >= FUSE_MAKE_VERSION(3, 0)
, struct fuse_file_info *fi
#endif
)
{
fuse_context *fc = fuse_get_context();
FuseStore *fs = static_cast<FuseStore*>(fc->private_data);
ldout(fs->store->cct, 10) << __func__ << " " << path << dendl;
return 0;
}
static int os_create(const char *path, mode_t mode, struct fuse_file_info *fi)
{
fuse_context *fc = fuse_get_context();
FuseStore *fs = static_cast<FuseStore*>(fc->private_data);
ldout(fs->store->cct, 10) << __func__ << " " << path << dendl;
coll_t cid;
ghobject_t oid;
string key;
uint32_t hash_value, hash_bits;
int f = parse_fn(fs->store->cct, path, &cid, &oid, &key, &hash_value,
&hash_bits);
if (f < 0)
return f;
std::lock_guard<std::mutex> l(fs->lock);
ObjectStore::CollectionHandle ch = fs->store->open_collection(cid);
ObjectStore::Transaction t;
bufferlist *pbl = 0;
switch (f) {
case FN_OBJECT_DATA:
{
pbl = new bufferlist;
fs->store->read(ch, oid, 0, 0, *pbl);
}
break;
case FN_OBJECT_ATTR_VAL:
{
pbl = new bufferlist;
bufferptr bp;
int r = fs->store->getattr(ch, oid, key.c_str(), bp);
if (r == -ENODATA) {
bufferlist empty;
t.setattr(cid, oid, key.c_str(), empty);
}
pbl->append(bp);
}
break;
case FN_OBJECT_OMAP_VAL:
{
pbl = new bufferlist;
set<string> k;
k.insert(key);
map<string,bufferlist> v;
fs->store->omap_get_values(ch, oid, k, &v);
if (v.count(key) == 0) {
map<string,bufferlist> aset;
aset[key] = bufferlist();
t.omap_setkeys(cid, oid, aset);
} else {
*pbl = v[key];
}
}
break;
}
if (!t.empty()) {
fs->store->queue_transaction(ch, std::move(t));
}
if (pbl) {
FuseStore::OpenFile *o = new FuseStore::OpenFile;
o->bl = std::move(*pbl);
o->dirty = true;
fi->fh = reinterpret_cast<uint64_t>(o);
}
return 0;
}
static int os_release(const char *path, struct fuse_file_info *fi)
{
fuse_context *fc = fuse_get_context();
FuseStore *fs = static_cast<FuseStore*>(fc->private_data);
ldout(fs->store->cct, 10) << __func__ << " " << path << dendl;
std::lock_guard<std::mutex> l(fs->lock);
FuseStore::OpenFile *o = reinterpret_cast<FuseStore::OpenFile*>(fi->fh);
if (--o->ref == 0) {
ldout(fs->store->cct, 10) << __func__ << " closing last " << o->path << dendl;
fs->open_files.erase(o->path);
delete o;
}
return 0;
}
static int os_read(const char *path, char *buf, size_t size, off_t offset,
struct fuse_file_info *fi)
{
fuse_context *fc = fuse_get_context();
FuseStore *fs = static_cast<FuseStore*>(fc->private_data);
ldout(fs->store->cct, 10) << __func__ << " " << path << " offset " << offset
<< " size " << size << dendl;
std::lock_guard<std::mutex> l(fs->lock);
FuseStore::OpenFile *o = reinterpret_cast<FuseStore::OpenFile*>(fi->fh);
if (!o)
return 0;
if (offset >= o->bl.length())
return 0;
if (offset + size > o->bl.length())
size = o->bl.length() - offset;
bufferlist r;
r.substr_of(o->bl, offset, size);
memcpy(buf, r.c_str(), r.length());
return r.length();
}
static int os_write(const char *path, const char *buf, size_t size,
off_t offset, struct fuse_file_info *fi)
{
fuse_context *fc = fuse_get_context();
FuseStore *fs = static_cast<FuseStore*>(fc->private_data);
ldout(fs->store->cct, 10) << __func__ << " " << path << " offset " << offset
<< " size " << size << dendl;
std::lock_guard<std::mutex> l(fs->lock);
FuseStore::OpenFile *o = reinterpret_cast<FuseStore::OpenFile*>(fi->fh);
if (!o)
return 0;
bufferlist final;
if (offset) {
if (offset > o->bl.length()) {
final.substr_of(o->bl, 0, offset);
} else {
final.claim_append(o->bl);
size_t zlen = offset - final.length();
final.append_zero(zlen);
}
}
final.append(buf, size);
if (offset + size < o->bl.length()) {
bufferlist rest;
rest.substr_of(o->bl, offset + size, o->bl.length() - offset - size);
final.claim_append(rest);
}
o->bl = final;
o->dirty = true;
return size;
}
int os_flush(const char *path, struct fuse_file_info *fi)
{
fuse_context *fc = fuse_get_context();
FuseStore *fs = static_cast<FuseStore*>(fc->private_data);
ldout(fs->store->cct, 10) << __func__ << " " << path << dendl;
coll_t cid;
ghobject_t oid;
string key;
uint32_t hash_value, hash_bits;
int f = parse_fn(fs->store->cct, path, &cid, &oid, &key, &hash_value,
&hash_bits);
if (f < 0)
return f;
std::lock_guard<std::mutex> l(fs->lock);
FuseStore::OpenFile *o = reinterpret_cast<FuseStore::OpenFile*>(fi->fh);
if (!o)
return 0;
if (!o->dirty)
return 0;
ObjectStore::CollectionHandle ch = fs->store->open_collection(cid);
ObjectStore::Transaction t;
switch (f) {
case FN_OBJECT_DATA:
t.write(cid, oid, 0, o->bl.length(), o->bl);
break;
case FN_OBJECT_ATTR_VAL:
t.setattr(cid, oid, key.c_str(), o->bl);
break;
case FN_OBJECT_OMAP_VAL:
{
map<string,bufferlist> aset;
aset[key] = o->bl;
t.omap_setkeys(cid, oid, aset);
break;
}
case FN_OBJECT_OMAP_HEADER: