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cmd_fusemount.c
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cmd_fusemount.c
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#ifdef BCACHEFS_FUSE
#include <errno.h>
#include <float.h>
#include <getopt.h>
#include <stdio.h>
#include <sys/statvfs.h>
#include <fuse_lowlevel.h>
#include "cmds.h"
#include "libbcachefs.h"
#include "tools-util.h"
#include "libbcachefs/bcachefs.h"
#include "libbcachefs/alloc_foreground.h"
#include "libbcachefs/btree_iter.h"
#include "libbcachefs/buckets.h"
#include "libbcachefs/dirent.h"
#include "libbcachefs/error.h"
#include "libbcachefs/fs-common.h"
#include "libbcachefs/inode.h"
#include "libbcachefs/io.h"
#include "libbcachefs/opts.h"
#include "libbcachefs/super.h"
/* mode_to_type(): */
#include "libbcachefs/fs.h"
#include <linux/dcache.h>
/* XXX cut and pasted from fsck.c */
#define QSTR(n) { { { .len = strlen(n) } }, .name = n }
static inline u64 map_root_ino(u64 ino)
{
return ino == 1 ? 4096 : ino;
}
static inline u64 unmap_root_ino(u64 ino)
{
return ino == 4096 ? 1 : ino;
}
static struct stat inode_to_stat(struct bch_fs *c,
struct bch_inode_unpacked *bi)
{
return (struct stat) {
.st_ino = unmap_root_ino(bi->bi_inum),
.st_size = bi->bi_size,
.st_mode = bi->bi_mode,
.st_uid = bi->bi_uid,
.st_gid = bi->bi_gid,
.st_nlink = bch2_inode_nlink_get(bi),
.st_rdev = bi->bi_dev,
.st_blksize = block_bytes(c),
.st_blocks = bi->bi_sectors,
.st_atim = bch2_time_to_timespec(c, bi->bi_atime),
.st_mtim = bch2_time_to_timespec(c, bi->bi_mtime),
.st_ctim = bch2_time_to_timespec(c, bi->bi_ctime),
};
}
static struct fuse_entry_param inode_to_entry(struct bch_fs *c,
struct bch_inode_unpacked *bi)
{
return (struct fuse_entry_param) {
.ino = unmap_root_ino(bi->bi_inum),
.generation = bi->bi_generation,
.attr = inode_to_stat(c, bi),
.attr_timeout = DBL_MAX,
.entry_timeout = DBL_MAX,
};
}
static void bcachefs_fuse_init(void *arg, struct fuse_conn_info *conn)
{
if (conn->capable & FUSE_CAP_WRITEBACK_CACHE) {
fuse_log(FUSE_LOG_DEBUG, "fuse_init: activating writeback\n");
conn->want |= FUSE_CAP_WRITEBACK_CACHE;
} else
fuse_log(FUSE_LOG_DEBUG, "fuse_init: writeback not capable\n");
//conn->want |= FUSE_CAP_POSIX_ACL;
}
static void bcachefs_fuse_destroy(void *arg)
{
struct bch_fs *c = arg;
bch2_fs_stop(c);
}
static void bcachefs_fuse_lookup(fuse_req_t req, fuse_ino_t dir,
const char *name)
{
struct bch_fs *c = fuse_req_userdata(req);
struct bch_inode_unpacked bi;
struct qstr qstr = QSTR(name);
u64 inum;
int ret;
fuse_log(FUSE_LOG_DEBUG, "fuse_lookup(dir=%llu name=%s)\n",
dir, name);
dir = map_root_ino(dir);
ret = bch2_inode_find_by_inum(c, dir, &bi);
if (ret) {
fuse_reply_err(req, -ret);
return;
}
struct bch_hash_info hash_info = bch2_hash_info_init(c, &bi);
inum = bch2_dirent_lookup(c, dir, &hash_info, &qstr);
if (!inum) {
struct fuse_entry_param e = {
.attr_timeout = DBL_MAX,
.entry_timeout = DBL_MAX,
};
fuse_reply_entry(req, &e);
return;
}
ret = bch2_inode_find_by_inum(c, inum, &bi);
if (ret)
goto err;
fuse_log(FUSE_LOG_DEBUG, "fuse_lookup ret(inum=%llu)\n",
bi.bi_inum);
struct fuse_entry_param e = inode_to_entry(c, &bi);
fuse_reply_entry(req, &e);
return;
err:
fuse_log(FUSE_LOG_DEBUG, "fuse_lookup error %i\n", ret);
fuse_reply_err(req, -ret);
}
static void bcachefs_fuse_getattr(fuse_req_t req, fuse_ino_t inum,
struct fuse_file_info *fi)
{
struct bch_fs *c = fuse_req_userdata(req);
struct bch_inode_unpacked bi;
struct stat attr;
int ret;
fuse_log(FUSE_LOG_DEBUG, "fuse_getattr(inum=%llu)\n",
inum);
inum = map_root_ino(inum);
ret = bch2_inode_find_by_inum(c, inum, &bi);
if (ret) {
fuse_log(FUSE_LOG_DEBUG, "fuse_getattr error %i\n", ret);
fuse_reply_err(req, -ret);
return;
}
fuse_log(FUSE_LOG_DEBUG, "fuse_getattr success\n");
attr = inode_to_stat(c, &bi);
fuse_reply_attr(req, &attr, DBL_MAX);
}
static void bcachefs_fuse_setattr(fuse_req_t req, fuse_ino_t inum,
struct stat *attr, int to_set,
struct fuse_file_info *fi)
{
struct bch_fs *c = fuse_req_userdata(req);
struct bch_inode_unpacked inode_u;
struct btree_trans trans;
struct btree_iter iter;
u64 now;
int ret;
fuse_log(FUSE_LOG_DEBUG, "bcachefs_fuse_setattr(%llu, %x)\n",
inum, to_set);
inum = map_root_ino(inum);
bch2_trans_init(&trans, c, 0, 0);
retry:
bch2_trans_begin(&trans);
now = bch2_current_time(c);
ret = bch2_inode_peek(&trans, &iter, &inode_u, inum, BTREE_ITER_INTENT);
if (ret)
goto err;
if (to_set & FUSE_SET_ATTR_MODE)
inode_u.bi_mode = attr->st_mode;
if (to_set & FUSE_SET_ATTR_UID)
inode_u.bi_uid = attr->st_uid;
if (to_set & FUSE_SET_ATTR_GID)
inode_u.bi_gid = attr->st_gid;
if (to_set & FUSE_SET_ATTR_SIZE)
inode_u.bi_size = attr->st_size;
if (to_set & FUSE_SET_ATTR_ATIME)
inode_u.bi_atime = timespec_to_bch2_time(c, attr->st_atim);
if (to_set & FUSE_SET_ATTR_MTIME)
inode_u.bi_mtime = timespec_to_bch2_time(c, attr->st_mtim);
if (to_set & FUSE_SET_ATTR_ATIME_NOW)
inode_u.bi_atime = now;
if (to_set & FUSE_SET_ATTR_MTIME_NOW)
inode_u.bi_mtime = now;
/* TODO: CTIME? */
ret = bch2_inode_write(&trans, &iter, &inode_u) ?:
bch2_trans_commit(&trans, NULL, NULL,
BTREE_INSERT_NOFAIL);
err:
bch2_trans_iter_exit(&trans, &iter);
if (ret == -EINTR)
goto retry;
bch2_trans_exit(&trans);
if (!ret) {
*attr = inode_to_stat(c, &inode_u);
fuse_reply_attr(req, attr, DBL_MAX);
} else {
fuse_reply_err(req, -ret);
}
}
static int do_create(struct bch_fs *c, u64 dir,
const char *name, mode_t mode, dev_t rdev,
struct bch_inode_unpacked *new_inode)
{
struct qstr qstr = QSTR(name);
struct bch_inode_unpacked dir_u;
dir = map_root_ino(dir);
bch2_inode_init_early(c, new_inode);
return bch2_trans_do(c, NULL, NULL, 0,
bch2_create_trans(&trans,
dir, &dir_u,
new_inode, &qstr,
0, 0, mode, rdev, NULL, NULL));
}
static void bcachefs_fuse_mknod(fuse_req_t req, fuse_ino_t dir,
const char *name, mode_t mode,
dev_t rdev)
{
struct bch_fs *c = fuse_req_userdata(req);
struct bch_inode_unpacked new_inode;
int ret;
fuse_log(FUSE_LOG_DEBUG, "bcachefs_fuse_mknod(%llu, %s, %x, %x)\n",
dir, name, mode, rdev);
ret = do_create(c, dir, name, mode, rdev, &new_inode);
if (ret)
goto err;
struct fuse_entry_param e = inode_to_entry(c, &new_inode);
fuse_reply_entry(req, &e);
return;
err:
fuse_reply_err(req, -ret);
}
static void bcachefs_fuse_mkdir(fuse_req_t req, fuse_ino_t dir,
const char *name, mode_t mode)
{
fuse_log(FUSE_LOG_DEBUG, "bcachefs_fuse_mkdir(%llu, %s, %x)\n",
dir, name, mode);
BUG_ON(mode & S_IFMT);
mode |= S_IFDIR;
bcachefs_fuse_mknod(req, dir, name, mode, 0);
}
static void bcachefs_fuse_unlink(fuse_req_t req, fuse_ino_t dir,
const char *name)
{
struct bch_fs *c = fuse_req_userdata(req);
struct bch_inode_unpacked dir_u, inode_u;
struct qstr qstr = QSTR(name);
int ret;
fuse_log(FUSE_LOG_DEBUG, "bcachefs_fuse_unlink(%llu, %s)\n", dir, name);
dir = map_root_ino(dir);
ret = bch2_trans_do(c, NULL, NULL, BTREE_INSERT_NOFAIL,
bch2_unlink_trans(&trans, dir, &dir_u,
&inode_u, &qstr));
fuse_reply_err(req, -ret);
}
static void bcachefs_fuse_rmdir(fuse_req_t req, fuse_ino_t dir,
const char *name)
{
fuse_log(FUSE_LOG_DEBUG, "bcachefs_fuse_rmdir(%llu, %s)\n", dir, name);
dir = map_root_ino(dir);
bcachefs_fuse_unlink(req, dir, name);
}
static void bcachefs_fuse_rename(fuse_req_t req,
fuse_ino_t src_dir, const char *srcname,
fuse_ino_t dst_dir, const char *dstname,
unsigned flags)
{
struct bch_fs *c = fuse_req_userdata(req);
struct bch_inode_unpacked dst_dir_u, src_dir_u;
struct bch_inode_unpacked src_inode_u, dst_inode_u;
struct qstr dst_name = QSTR(srcname);
struct qstr src_name = QSTR(dstname);
int ret;
fuse_log(FUSE_LOG_DEBUG,
"bcachefs_fuse_rename(%llu, %s, %llu, %s, %x)\n",
src_dir, srcname, dst_dir, dstname, flags);
src_dir = map_root_ino(src_dir);
dst_dir = map_root_ino(dst_dir);
/* XXX handle overwrites */
ret = bch2_trans_do(c, NULL, NULL, 0,
bch2_rename_trans(&trans,
src_dir, &src_dir_u,
dst_dir, &dst_dir_u,
&src_inode_u, &dst_inode_u,
&src_name, &dst_name,
BCH_RENAME));
fuse_reply_err(req, -ret);
}
static void bcachefs_fuse_link(fuse_req_t req, fuse_ino_t inum,
fuse_ino_t newparent, const char *newname)
{
struct bch_fs *c = fuse_req_userdata(req);
struct bch_inode_unpacked dir_u, inode_u;
struct qstr qstr = QSTR(newname);
int ret;
fuse_log(FUSE_LOG_DEBUG, "bcachefs_fuse_link(%llu, %llu, %s)\n",
inum, newparent, newname);
newparent = map_root_ino(newparent);
ret = bch2_trans_do(c, NULL, NULL, 0,
bch2_link_trans(&trans, newparent,
inum, &dir_u, &inode_u, &qstr));
if (!ret) {
struct fuse_entry_param e = inode_to_entry(c, &inode_u);
fuse_reply_entry(req, &e);
} else {
fuse_reply_err(req, -ret);
}
}
static void bcachefs_fuse_open(fuse_req_t req, fuse_ino_t inum,
struct fuse_file_info *fi)
{
fi->direct_io = false;
fi->keep_cache = true;
fi->cache_readdir = true;
fuse_reply_open(req, fi);
}
static void userbio_init(struct bio *bio, struct bio_vec *bv,
void *buf, size_t size)
{
bio_init(bio, bv, 1);
bio->bi_iter.bi_size = size;
bv->bv_page = buf;
bv->bv_len = size;
bv->bv_offset = 0;
}
static int get_inode_io_opts(struct bch_fs *c, u64 inum,
struct bch_io_opts *opts)
{
struct bch_inode_unpacked inode;
if (bch2_inode_find_by_inum(c, inum, &inode))
return -EINVAL;
*opts = bch2_opts_to_inode_opts(c->opts);
bch2_io_opts_apply(opts, bch2_inode_opts_get(&inode));
return 0;
}
static void bcachefs_fuse_read_endio(struct bio *bio)
{
closure_put(bio->bi_private);
}
struct fuse_align_io {
off_t start;
size_t pad_start;
off_t end;
size_t pad_end;
size_t size;
};
/* Handle unaligned start and end */
/* TODO: align to block_bytes, sector size, or page size? */
static struct fuse_align_io align_io(const struct bch_fs *c, size_t size,
off_t offset)
{
struct fuse_align_io align;
BUG_ON(offset < 0);
align.start = round_down(offset, block_bytes(c));
align.pad_start = offset - align.start;
off_t end = offset + size;
align.end = round_up(end, block_bytes(c));
align.pad_end = align.end - end;
align.size = align.end - align.start;
return align;
}
/*
* Given an aligned number of bytes transferred, figure out how many unaligned
* bytes were transferred.
*/
static size_t align_fix_up_bytes(const struct fuse_align_io *align,
size_t align_bytes)
{
size_t bytes = 0;
if (align_bytes > align->pad_start) {
bytes = align_bytes - align->pad_start;
bytes = bytes > align->pad_end ? bytes - align->pad_end : 0;
}
return bytes;
}
/*
* Read aligned data.
*/
static int read_aligned(struct bch_fs *c, fuse_ino_t inum, size_t aligned_size,
off_t aligned_offset, void *buf)
{
BUG_ON(aligned_size & (block_bytes(c) - 1));
BUG_ON(aligned_offset & (block_bytes(c) - 1));
struct bch_io_opts io_opts;
if (get_inode_io_opts(c, inum, &io_opts))
return -ENOENT;
struct bch_read_bio rbio;
struct bio_vec bv;
userbio_init(&rbio.bio, &bv, buf, aligned_size);
bio_set_op_attrs(&rbio.bio, REQ_OP_READ, REQ_SYNC);
rbio.bio.bi_iter.bi_sector = aligned_offset >> 9;
struct closure cl;
closure_init_stack(&cl);
closure_get(&cl);
rbio.bio.bi_end_io = bcachefs_fuse_read_endio;
rbio.bio.bi_private = &cl;
bch2_read(c, rbio_init(&rbio.bio, io_opts), inum);
closure_sync(&cl);
return -blk_status_to_errno(rbio.bio.bi_status);
}
static void bcachefs_fuse_read(fuse_req_t req, fuse_ino_t inum,
size_t size, off_t offset,
struct fuse_file_info *fi)
{
struct bch_fs *c = fuse_req_userdata(req);
fuse_log(FUSE_LOG_DEBUG, "bcachefs_fuse_read(%llu, %zd, %lld)\n",
inum, size, offset);
/* Check inode size. */
struct bch_inode_unpacked bi;
int ret = bch2_inode_find_by_inum(c, inum, &bi);
if (ret) {
fuse_reply_err(req, -ret);
return;
}
off_t end = min_t(u64, bi.bi_size, offset + size);
if (end <= offset) {
fuse_reply_buf(req, NULL, 0);
return;
}
size = end - offset;
struct fuse_align_io align = align_io(c, size, offset);
void *buf = aligned_alloc(PAGE_SIZE, align.size);
if (!buf) {
fuse_reply_err(req, ENOMEM);
return;
}
ret = read_aligned(c, inum, align.size, align.start, buf);
if (likely(!ret))
fuse_reply_buf(req, buf + align.pad_start, size);
else
fuse_reply_err(req, -ret);
free(buf);
}
static int inode_update_times(struct bch_fs *c, fuse_ino_t inum)
{
struct btree_trans trans;
struct btree_iter iter;
struct bch_inode_unpacked inode_u;
int ret = 0;
u64 now;
bch2_trans_init(&trans, c, 0, 0);
retry:
bch2_trans_begin(&trans);
now = bch2_current_time(c);
ret = bch2_inode_peek(&trans, &iter, &inode_u, inum, BTREE_ITER_INTENT);
if (ret)
goto err;
inode_u.bi_mtime = now;
inode_u.bi_ctime = now;
ret = bch2_inode_write(&trans, &iter, &inode_u);
if (ret)
goto err;
ret = bch2_trans_commit(&trans, NULL, NULL,
BTREE_INSERT_NOFAIL);
err:
bch2_trans_iter_exit(&trans, &iter);
if (ret == -EINTR)
goto retry;
bch2_trans_exit(&trans);
return ret;
}
static int write_aligned(struct bch_fs *c, fuse_ino_t inum,
struct bch_io_opts io_opts, void *buf,
size_t aligned_size, off_t aligned_offset,
off_t new_i_size, size_t *written_out)
{
struct bch_write_op op = { 0 };
struct bio_vec bv;
struct closure cl;
BUG_ON(aligned_size & (block_bytes(c) - 1));
BUG_ON(aligned_offset & (block_bytes(c) - 1));
*written_out = 0;
closure_init_stack(&cl);
bch2_write_op_init(&op, c, io_opts); /* XXX reads from op?! */
op.write_point = writepoint_hashed(0);
op.nr_replicas = io_opts.data_replicas;
op.target = io_opts.foreground_target;
op.pos = POS(inum, aligned_offset >> 9);
op.new_i_size = new_i_size;
userbio_init(&op.wbio.bio, &bv, buf, aligned_size);
bio_set_op_attrs(&op.wbio.bio, REQ_OP_WRITE, REQ_SYNC);
if (bch2_disk_reservation_get(c, &op.res, aligned_size >> 9,
op.nr_replicas, 0)) {
/* XXX: use check_range_allocated like dio write path */
return -ENOSPC;
}
closure_call(&op.cl, bch2_write, NULL, &cl);
closure_sync(&cl);
if (!op.error)
*written_out = op.written << 9;
return op.error;
}
static void bcachefs_fuse_write(fuse_req_t req, fuse_ino_t inum,
const char *buf, size_t size,
off_t offset,
struct fuse_file_info *fi)
{
struct bch_fs *c = fuse_req_userdata(req);
struct bch_io_opts io_opts;
size_t aligned_written;
int ret = 0;
fuse_log(FUSE_LOG_DEBUG, "bcachefs_fuse_write(%llu, %zd, %lld)\n",
inum, size, offset);
struct fuse_align_io align = align_io(c, size, offset);
void *aligned_buf = aligned_alloc(PAGE_SIZE, align.size);
BUG_ON(!aligned_buf);
if (get_inode_io_opts(c, inum, &io_opts)) {
ret = -ENOENT;
goto err;
}
/* Realign the data and read in start and end, if needed */
/* Read partial start data. */
if (align.pad_start) {
memset(aligned_buf, 0, block_bytes(c));
ret = read_aligned(c, inum, block_bytes(c), align.start,
aligned_buf);
if (ret)
goto err;
}
/*
* Read partial end data. If the whole write fits in one block, the
* start data and the end data are the same so this isn't needed.
*/
if (align.pad_end &&
!(align.pad_start && align.size == block_bytes(c))) {
off_t partial_end_start = align.end - block_bytes(c);
size_t buf_offset = align.size - block_bytes(c);
memset(aligned_buf + buf_offset, 0, block_bytes(c));
ret = read_aligned(c, inum, block_bytes(c), partial_end_start,
aligned_buf + buf_offset);
if (ret)
goto err;
}
/* Overlay what we want to write. */
memcpy(aligned_buf + align.pad_start, buf, size);
/* Actually write. */
ret = write_aligned(c, inum, io_opts, aligned_buf,
align.size, align.start,
offset + size, &aligned_written);
/* Figure out how many unaligned bytes were written. */
size_t written = align_fix_up_bytes(&align, aligned_written);
BUG_ON(written > size);
fuse_log(FUSE_LOG_DEBUG, "bcachefs_fuse_write: wrote %zd bytes\n",
written);
if (written > 0)
ret = 0;
/*
* Update inode times.
* TODO: Integrate with bch2_extent_update()
*/
if (!ret)
ret = inode_update_times(c, inum);
if (!ret) {
BUG_ON(written == 0);
fuse_reply_write(req, written);
free(aligned_buf);
return;
}
err:
fuse_reply_err(req, -ret);
free(aligned_buf);
}
static void bcachefs_fuse_symlink(fuse_req_t req, const char *link,
fuse_ino_t dir, const char *name)
{
struct bch_fs *c = fuse_req_userdata(req);
struct bch_inode_unpacked new_inode;
size_t link_len = strlen(link);
int ret;
fuse_log(FUSE_LOG_DEBUG, "bcachefs_fuse_symlink(%s, %llu, %s)\n",
link, dir, name);
dir = map_root_ino(dir);
ret = do_create(c, dir, name, S_IFLNK|S_IRWXUGO, 0, &new_inode);
if (ret)
goto err;
struct bch_io_opts io_opts;
ret = get_inode_io_opts(c, new_inode.bi_inum, &io_opts);
if (ret)
goto err;
struct fuse_align_io align = align_io(c, link_len + 1, 0);
void *aligned_buf = aligned_alloc(PAGE_SIZE, align.size);
BUG_ON(!aligned_buf);
memset(aligned_buf, 0, align.size);
memcpy(aligned_buf, link, link_len); /* already terminated */
size_t aligned_written;
ret = write_aligned(c, new_inode.bi_inum, io_opts, aligned_buf,
align.size, align.start, link_len + 1,
&aligned_written);
free(aligned_buf);
if (ret)
goto err;
size_t written = align_fix_up_bytes(&align, aligned_written);
BUG_ON(written != link_len + 1); // TODO: handle short
ret = inode_update_times(c, new_inode.bi_inum);
if (ret)
goto err;
new_inode.bi_size = written;
struct fuse_entry_param e = inode_to_entry(c, &new_inode);
fuse_reply_entry(req, &e);
return;
err:
fuse_reply_err(req, -ret);
}
static void bcachefs_fuse_readlink(fuse_req_t req, fuse_ino_t inum)
{
struct bch_fs *c = fuse_req_userdata(req);
char *buf = NULL;
fuse_log(FUSE_LOG_DEBUG, "bcachefs_fuse_readlink(%llu)\n", inum);
struct bch_inode_unpacked bi;
int ret = bch2_inode_find_by_inum(c, inum, &bi);
if (ret)
goto err;
struct fuse_align_io align = align_io(c, bi.bi_size, 0);
ret = -ENOMEM;
buf = aligned_alloc(PAGE_SIZE, align.size);
if (!buf)
goto err;
ret = read_aligned(c, inum, align.size, align.start, buf);
if (ret)
goto err;
BUG_ON(buf[align.size - 1] != 0);
fuse_reply_readlink(req, buf);
err:
if (ret)
fuse_reply_err(req, -ret);
free(buf);
}
#if 0
/*
* FUSE flush is essentially the close() call, however it is not guaranteed
* that one flush happens per open/create.
*
* It doesn't have to do anything, and is mostly relevant for NFS-style
* filesystems where close has some relationship to caching.
*/
static void bcachefs_fuse_flush(fuse_req_t req, fuse_ino_t inum,
struct fuse_file_info *fi)
{
struct bch_fs *c = fuse_req_userdata(req);
}
static void bcachefs_fuse_release(fuse_req_t req, fuse_ino_t inum,
struct fuse_file_info *fi)
{
struct bch_fs *c = fuse_req_userdata(req);
}
static void bcachefs_fuse_fsync(fuse_req_t req, fuse_ino_t inum, int datasync,
struct fuse_file_info *fi)
{
struct bch_fs *c = fuse_req_userdata(req);
}
static void bcachefs_fuse_opendir(fuse_req_t req, fuse_ino_t inum,
struct fuse_file_info *fi)
{
struct bch_fs *c = fuse_req_userdata(req);
}
#endif
struct fuse_dir_context {
struct dir_context ctx;
fuse_req_t req;
char *buf;
size_t bufsize;
};
struct fuse_dirent {
uint64_t ino;
uint64_t off;
uint32_t namelen;
uint32_t type;
char name[];
};
#define FUSE_NAME_OFFSET offsetof(struct fuse_dirent, name)
#define FUSE_DIRENT_ALIGN(x) \
(((x) + sizeof(uint64_t) - 1) & ~(sizeof(uint64_t) - 1))
static size_t fuse_add_direntry2(char *buf, size_t bufsize,
const char *name, int namelen,
const struct stat *stbuf, off_t off)
{
size_t entlen = FUSE_NAME_OFFSET + namelen;
size_t entlen_padded = FUSE_DIRENT_ALIGN(entlen);
struct fuse_dirent *dirent = (struct fuse_dirent *) buf;
if ((buf == NULL) || (entlen_padded > bufsize))
return entlen_padded;
dirent->ino = stbuf->st_ino;
dirent->off = off;
dirent->namelen = namelen;
dirent->type = (stbuf->st_mode & S_IFMT) >> 12;
memcpy(dirent->name, name, namelen);
memset(dirent->name + namelen, 0, entlen_padded - entlen);
return entlen_padded;
}
static int fuse_filldir(struct dir_context *_ctx,
const char *name, int namelen,
loff_t pos, u64 ino, unsigned type)
{
struct fuse_dir_context *ctx =
container_of(_ctx, struct fuse_dir_context, ctx);
struct stat statbuf = {
.st_ino = unmap_root_ino(ino),
.st_mode = type << 12,
};
fuse_log(FUSE_LOG_DEBUG, "fuse_filldir(name=%s inum=%llu pos=%llu)\n",
name, statbuf.st_ino, pos);
size_t len = fuse_add_direntry2(ctx->buf,
ctx->bufsize,
name,
namelen,
&statbuf,
pos + 1);
if (len > ctx->bufsize)
return -1;
ctx->buf += len;
ctx->bufsize -= len;
return 0;
}
static bool handle_dots(struct fuse_dir_context *ctx, fuse_ino_t dir)
{
if (ctx->ctx.pos == 0) {
if (fuse_filldir(&ctx->ctx, ".", 1, ctx->ctx.pos,
dir, DT_DIR) < 0)
return false;
ctx->ctx.pos = 1;
}
if (ctx->ctx.pos == 1) {
if (fuse_filldir(&ctx->ctx, "..", 2, ctx->ctx.pos,
/*TODO: parent*/ 1, DT_DIR) < 0)
return false;
ctx->ctx.pos = 2;
}
return true;
}
static void bcachefs_fuse_readdir(fuse_req_t req, fuse_ino_t dir,
size_t size, off_t off,
struct fuse_file_info *fi)
{
struct bch_fs *c = fuse_req_userdata(req);
struct bch_inode_unpacked bi;
char *buf = calloc(size, 1);
struct fuse_dir_context ctx = {
.ctx.actor = fuse_filldir,
.ctx.pos = off,
.req = req,
.buf = buf,
.bufsize = size,
};
int ret = 0;
fuse_log(FUSE_LOG_DEBUG, "bcachefs_fuse_readdir(dir=%llu, size=%zu, "
"off=%lld)\n", dir, size, off);
dir = map_root_ino(dir);
ret = bch2_inode_find_by_inum(c, dir, &bi);
if (ret)
goto reply;
if (!S_ISDIR(bi.bi_mode)) {
ret = -ENOTDIR;
goto reply;
}
if (!handle_dots(&ctx, dir))
goto reply;
ret = bch2_readdir(c, dir, &ctx.ctx);
reply:
if (!ret) {
fuse_log(FUSE_LOG_DEBUG, "bcachefs_fuse_readdir reply %zd\n",
ctx.buf - buf);
fuse_reply_buf(req, buf, ctx.buf - buf);
} else {
fuse_reply_err(req, -ret);
}
free(buf);
}
#if 0
static void bcachefs_fuse_readdirplus(fuse_req_t req, fuse_ino_t dir,
size_t size, off_t off,
struct fuse_file_info *fi)
{
}
static void bcachefs_fuse_releasedir(fuse_req_t req, fuse_ino_t inum,
struct fuse_file_info *fi)
{
struct bch_fs *c = fuse_req_userdata(req);
}
static void bcachefs_fuse_fsyncdir(fuse_req_t req, fuse_ino_t inum, int datasync,
struct fuse_file_info *fi)
{
struct bch_fs *c = fuse_req_userdata(req);
}
#endif
static void bcachefs_fuse_statfs(fuse_req_t req, fuse_ino_t inum)
{
struct bch_fs *c = fuse_req_userdata(req);
struct bch_fs_usage_short usage = bch2_fs_usage_read_short(c);
unsigned shift = c->block_bits;
struct statvfs statbuf = {
.f_bsize = block_bytes(c),
.f_frsize = block_bytes(c),
.f_blocks = usage.capacity >> shift,
.f_bfree = (usage.capacity - usage.used) >> shift,
//.f_bavail = statbuf.f_bfree,
.f_files = usage.nr_inodes,
.f_ffree = U64_MAX,
.f_namemax = BCH_NAME_MAX,
};
fuse_reply_statfs(req, &statbuf);
}
#if 0
static void bcachefs_fuse_setxattr(fuse_req_t req, fuse_ino_t inum,
const char *name, const char *value,
size_t size, int flags)
{
struct bch_fs *c = fuse_req_userdata(req);
}
static void bcachefs_fuse_getxattr(fuse_req_t req, fuse_ino_t inum,
const char *name, size_t size)
{
struct bch_fs *c = fuse_req_userdata(req);
fuse_reply_xattr(req, );
}