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fuse_dirents.c
429 lines (349 loc) · 7.81 KB
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fuse_dirents.c
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#define _FILE_OFFSET_BITS 64
#include "fuse_attr.h"
#include "fuse_dirent.h"
#include "fuse_direntplus.h"
#include "fuse_dirents.h"
#include "fuse_entry.h"
#include "stat_utils.h"
#include <dirent.h>
#include <errno.h>
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define DEFAULT_SIZE (1024 * 16)
static
uint64_t
align_uint64_t(uint64_t v_)
{
return ((v_ + sizeof(uint64_t) - 1) & ~(sizeof(uint64_t) - 1));
}
static
uint64_t
fuse_dirent_size(const uint64_t namelen_)
{
uint64_t rv;
rv = offsetof(fuse_dirent_t,name);
rv += namelen_;
rv = align_uint64_t(rv);
return rv;
}
static
uint64_t
fuse_direntplus_size(const uint64_t namelen_)
{
uint64_t rv;
rv = offsetof(fuse_direntplus_t,dirent.name);
rv += namelen_;
rv = align_uint64_t(rv);
return rv;
}
static
int
fuse_dirents_resize(fuse_dirents_t *d_,
uint64_t size_)
{
void *p;
if((d_->data_len + size_) >= d_->buf_len)
{
p = realloc(d_->buf,(d_->buf_len * 2));
if(p == NULL)
return -errno;
d_->buf = p;
d_->buf_len *= 2;
}
return 0;
}
static
void*
fuse_dirents_alloc(fuse_dirents_t *d_,
uint64_t size_)
{
int rv;
fuse_dirent_t *d;
rv = fuse_dirents_resize(d_,size_);
if(rv)
return NULL;
d = (fuse_dirent_t*)&d_->buf[d_->data_len];
d_->data_len += size_;
return d;
}
static
void
fuse_dirents_fill_attr(fuse_attr_t *attr_,
const struct stat *st_)
{
attr_->ino = st_->st_ino;
attr_->size = st_->st_size;
attr_->blocks = st_->st_blocks;
attr_->atime = st_->st_atime;
attr_->mtime = st_->st_mtime;
attr_->ctime = st_->st_ctime;
attr_->atimensec = ST_ATIM_NSEC(st_);
attr_->mtimensec = ST_MTIM_NSEC(st_);
attr_->ctimensec = ST_CTIM_NSEC(st_);
attr_->mode = st_->st_mode;
attr_->nlink = st_->st_nlink;
attr_->uid = st_->st_uid;
attr_->gid = st_->st_gid;
attr_->rdev = st_->st_rdev;
attr_->blksize = st_->st_blksize;
}
fuse_dirent_t*
fuse_dirent_next(fuse_dirent_t *cur_)
{
char *buf;
buf = (char*)cur_;
buf += fuse_dirent_size(cur_->namelen);
return (fuse_dirent_t*)buf;
}
fuse_direntplus_t*
fuse_direntplus_next(fuse_direntplus_t *cur_)
{
char *buf;
buf = (char*)cur_;
buf += fuse_direntplus_size(cur_->dirent.namelen);
return (fuse_direntplus_t*)buf;
}
fuse_dirent_t*
fuse_dirent_find(fuse_dirents_t *d_,
const uint64_t ino_)
{
fuse_dirent_t *cur;
fuse_dirent_t *end;
if(d_->type != NORMAL)
return NULL;
cur = (fuse_dirent_t*)&d_->buf[0];
end = (fuse_dirent_t*)&d_->buf[d_->data_len];
while(cur < end)
{
if(cur->ino == ino_)
return cur;
cur = fuse_dirent_next(cur);
}
return NULL;
}
fuse_direntplus_t*
fuse_direntplus_find(fuse_dirents_t *d_,
const uint64_t ino_)
{
fuse_direntplus_t *cur;
fuse_direntplus_t *end;
if(d_->type != PLUS)
return NULL;
cur = (fuse_direntplus_t*)&d_->buf[0];
end = (fuse_direntplus_t*)&d_->buf[d_->data_len];
while(cur < end)
{
if(cur->dirent.ino == ino_)
return cur;
cur = fuse_direntplus_next(cur);
}
return NULL;
}
void*
fuse_dirents_find(fuse_dirents_t *d_,
const uint64_t ino_)
{
switch(d_->type)
{
default:
case UNSET:
return NULL;
case NORMAL:
return fuse_dirent_find(d_,ino_);
case PLUS:
return fuse_direntplus_find(d_,ino_);
}
}
int
fuse_dirents_convert_plus2normal(fuse_dirents_t *d_)
{
int rv;
uint64_t size;
fuse_dirent_t *d;
fuse_dirents_t normal;
fuse_direntplus_t *cur;
fuse_direntplus_t *end;
rv = fuse_dirents_init(&normal);
if(rv < 0)
return rv;
cur = (fuse_direntplus_t*)&d_->buf[0];
end = (fuse_direntplus_t*)&d_->buf[d_->data_len];
while(cur < end)
{
size = fuse_dirent_size(cur->dirent.namelen);
d = fuse_dirents_alloc(&normal,size);
if(d == NULL)
return -ENOMEM;
memcpy(d,&cur->dirent,size);
d->off = normal.data_len;;
cur = fuse_direntplus_next(cur);
}
fuse_dirents_free(d_);
normal.type = NORMAL;
*d_ = normal;
return 0;
}
int
fuse_dirents_add(fuse_dirents_t *d_,
const struct dirent *dirent_)
{
uint64_t size;
uint64_t namelen;
fuse_dirent_t *d;
switch(d_->type)
{
case UNSET:
d_->type = NORMAL;
break;
case NORMAL:
break;
case PLUS:
return -EINVAL;
}
namelen = _D_ALLOC_NAMLEN(dirent_);
size = fuse_dirent_size(namelen);
d = fuse_dirents_alloc(d_,size);
if(d == NULL)
return -ENOMEM;
d->ino = dirent_->d_ino;
d->off = d_->data_len;
d->namelen = namelen;
d->type = dirent_->d_type;
memcpy(d->name,dirent_->d_name,namelen);
return 0;
}
int
fuse_dirents_add_plus(fuse_dirents_t *d_,
const struct dirent *dirent_,
const fuse_entry_t *entry_,
const struct stat *st_)
{
uint64_t size;
uint64_t namelen;
fuse_direntplus_t *d;
switch(d_->type)
{
case UNSET:
d_->type = PLUS;
break;
case NORMAL:
return -EINVAL;
case PLUS:
break;
}
namelen = _D_ALLOC_NAMLEN(dirent_);
size = fuse_direntplus_size(namelen);
d = fuse_dirents_alloc(d_,size);
if(d == NULL)
return -ENOMEM;
d->dirent.ino = dirent_->d_ino;
d->dirent.off = d_->data_len;
d->dirent.namelen = namelen;
d->dirent.type = dirent_->d_type;
memcpy(d->dirent.name,dirent_->d_name,namelen);
d->entry = *entry_;
fuse_dirents_fill_attr(&d->attr,st_);
return 0;
}
#ifdef __linux__
struct linux_dirent64
{
uint64_t d_ino;
int64_t d_off;
uint16_t d_reclen;
uint8_t d_type;
char d_name[];
};
int
fuse_dirents_add_linux(fuse_dirents_t *d_,
const struct linux_dirent64 *dirent_)
{
uint64_t size;
uint64_t namelen;
fuse_dirent_t *d;
switch(d_->type)
{
case UNSET:
d_->type = NORMAL;
break;
case NORMAL:
break;
case PLUS:
return -EINVAL;
}
namelen = (dirent_->d_reclen - offsetof(struct linux_dirent64,d_name));
size = fuse_dirent_size(namelen);
d = fuse_dirents_alloc(d_,size);
if(d == NULL)
return -ENOMEM;
d->ino = dirent_->d_ino;
d->off = d_->data_len;
d->namelen = namelen;
d->type = dirent_->d_type;
memcpy(d->name,dirent_->d_name,namelen);
return 0;
}
int
fuse_dirents_add_linux_plus(fuse_dirents_t *d_,
const struct linux_dirent64 *dirent_,
const fuse_entry_t *entry_,
const struct stat *st_)
{
uint64_t size;
uint64_t namelen;
fuse_direntplus_t *d;
switch(d_->type)
{
case UNSET:
d_->type = PLUS;
break;
case NORMAL:
return -EINVAL;
case PLUS:
break;
}
namelen = (dirent_->d_reclen - offsetof(struct linux_dirent64,d_name));
size = fuse_direntplus_size(namelen);
d = fuse_dirents_alloc(d_,size);
if(d == NULL)
return -ENOMEM;
d->dirent.ino = dirent_->d_ino;
d->dirent.off = d_->data_len;
d->dirent.namelen = namelen;
d->dirent.type = dirent_->d_type;
memcpy(d->dirent.name,dirent_->d_name,namelen);
d->entry = *entry_;
fuse_dirents_fill_attr(&d->attr,st_);
return 0;
}
#endif
void
fuse_dirents_reset(fuse_dirents_t *d_)
{
d_->data_len = 0;
d_->type = UNSET;
}
int
fuse_dirents_init(fuse_dirents_t *d_)
{
void *buf;
buf = calloc(DEFAULT_SIZE,1);
if(buf == NULL)
return -ENOMEM;
d_->buf = buf;
d_->buf_len = DEFAULT_SIZE;
d_->data_len = 0;
d_->type = UNSET;
return 0;
}
void
fuse_dirents_free(fuse_dirents_t *d_)
{
d_->buf_len = 0;
d_->data_len = 0;
d_->type = UNSET;
free(d_->buf);
}