[PATCH v4 03/15] fs/fuse: add an idmap argument to fuse_simple_request

From: Alexander Mikhalitsyn
Date: Tue Sep 03 2024 - 11:18:51 EST

If idmap == NULL *and* filesystem daemon declared idmapped mounts
support, then uid/gid values in a fuse header will be -1.

No functional changes intended.

Cc: Christian Brauner <brauner@xxxxxxxxxx>
Cc: Seth Forshee <sforshee@xxxxxxxxxx>
Cc: Miklos Szeredi <miklos@xxxxxxxxxx>
Cc: Amir Goldstein <amir73il@xxxxxxxxx>
Cc: Bernd Schubert <bschubert@xxxxxxx>
Cc: <linux-fsdevel@xxxxxxxxxxxxxxx>
Signed-off-by: Alexander Mikhalitsyn <aleksandr.mikhalitsyn@xxxxxxxxxxxxx>
---
v4:
- this commit added
---
fs/fuse/dax.c | 4 ++--
fs/fuse/dev.c | 6 ++++--
fs/fuse/dir.c | 26 +++++++++++++-------------
fs/fuse/file.c | 32 ++++++++++++++++----------------
fs/fuse/fuse_i.h | 3 ++-
fs/fuse/inode.c | 6 +++---
fs/fuse/ioctl.c | 2 +-
fs/fuse/readdir.c | 4 ++--
fs/fuse/xattr.c | 8 ++++----
9 files changed, 47 insertions(+), 44 deletions(-)

diff --git a/fs/fuse/dax.c b/fs/fuse/dax.c
index 12ef91d170bb..6d8368d66dd4 100644
--- a/fs/fuse/dax.c
+++ b/fs/fuse/dax.c
@@ -207,7 +207,7 @@ static int fuse_setup_one_mapping(struct inode *inode, unsigned long start_idx,
args.in_numargs = 1;
args.in_args[0].size = sizeof(inarg);
args.in_args[0].value = &inarg;
- err = fuse_simple_request(fm, &args);
+ err = fuse_simple_request(NULL, fm, &args);
if (err < 0)
return err;
dmap->writable = writable;
@@ -245,7 +245,7 @@ static int fuse_send_removemapping(struct inode *inode,
args.in_args[0].value = inargp;
args.in_args[1].size = inargp->count * sizeof(*remove_one);
args.in_args[1].value = remove_one;
- return fuse_simple_request(fm, &args);
+ return fuse_simple_request(NULL, fm, &args);
}

static int dmap_removemapping_list(struct inode *inode, unsigned int num,
diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c
index d3f3c3557c04..349fc84897a5 100644
--- a/fs/fuse/dev.c
+++ b/fs/fuse/dev.c
@@ -508,7 +508,9 @@ static void fuse_args_to_req(struct fuse_req *req, struct fuse_args *args)
__set_bit(FR_ASYNC, &req->flags);
}

-ssize_t fuse_simple_request(struct fuse_mount *fm, struct fuse_args *args)
+ssize_t fuse_simple_request(struct mnt_idmap *idmap,
+ struct fuse_mount *fm,
+ struct fuse_args *args)
{
struct fuse_conn *fc = fm->fc;
struct fuse_req *req;
@@ -525,7 +527,7 @@ ssize_t fuse_simple_request(struct fuse_mount *fm, struct fuse_args *args)
__set_bit(FR_FORCE, &req->flags);
} else {
WARN_ON(args->nocreds);
- req = fuse_get_req(NULL, fm, false);
+ req = fuse_get_req(idmap, fm, false);
if (IS_ERR(req))
return PTR_ERR(req);
}
diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c
index 2b0d4781f394..2a8344776350 100644
--- a/fs/fuse/dir.c
+++ b/fs/fuse/dir.c
@@ -230,7 +230,7 @@ static int fuse_dentry_revalidate(struct dentry *entry, unsigned int flags)
parent = dget_parent(entry);
fuse_lookup_init(fm->fc, &args, get_node_id(d_inode(parent)),
&entry->d_name, &outarg);
- ret = fuse_simple_request(fm, &args);
+ ret = fuse_simple_request(NULL, fm, &args);
dput(parent);
/* Zero nodeid is same as -ENOENT */
if (!ret && !outarg.nodeid)
@@ -383,7 +383,7 @@ int fuse_lookup_name(struct super_block *sb, u64 nodeid, const struct qstr *name
attr_version = fuse_get_attr_version(fm->fc);

fuse_lookup_init(fm->fc, &args, nodeid, name, outarg);
- err = fuse_simple_request(fm, &args);
+ err = fuse_simple_request(NULL, fm, &args);
/* Zero nodeid is same as -ENOENT, but with valid timeout */
if (err || !outarg->nodeid)
goto out_put_forget;
@@ -672,7 +672,7 @@ static int fuse_create_open(struct inode *dir, struct dentry *entry,
if (err)
goto out_put_forget_req;

- err = fuse_simple_request(fm, &args);
+ err = fuse_simple_request(NULL, fm, &args);
free_ext_value(&args);
if (err)
goto out_free_ff;
@@ -803,7 +803,7 @@ static int create_new_entry(struct fuse_mount *fm, struct fuse_args *args,
goto out_put_forget_req;
}

- err = fuse_simple_request(fm, args);
+ err = fuse_simple_request(NULL, fm, args);
free_ext_value(args);
if (err)
goto out_put_forget_req;
@@ -987,7 +987,7 @@ static int fuse_unlink(struct inode *dir, struct dentry *entry)
args.in_numargs = 1;
args.in_args[0].size = entry->d_name.len + 1;
args.in_args[0].value = entry->d_name.name;
- err = fuse_simple_request(fm, &args);
+ err = fuse_simple_request(NULL, fm, &args);
if (!err) {
fuse_dir_changed(dir);
fuse_entry_unlinked(entry);
@@ -1010,7 +1010,7 @@ static int fuse_rmdir(struct inode *dir, struct dentry *entry)
args.in_numargs = 1;
args.in_args[0].size = entry->d_name.len + 1;
args.in_args[0].value = entry->d_name.name;
- err = fuse_simple_request(fm, &args);
+ err = fuse_simple_request(NULL, fm, &args);
if (!err) {
fuse_dir_changed(dir);
fuse_entry_unlinked(entry);
@@ -1040,7 +1040,7 @@ static int fuse_rename_common(struct inode *olddir, struct dentry *oldent,
args.in_args[1].value = oldent->d_name.name;
args.in_args[2].size = newent->d_name.len + 1;
args.in_args[2].value = newent->d_name.name;
- err = fuse_simple_request(fm, &args);
+ err = fuse_simple_request(NULL, fm, &args);
if (!err) {
/* ctime changes */
fuse_update_ctime(d_inode(oldent));
@@ -1210,7 +1210,7 @@ static int fuse_do_statx(struct inode *inode, struct file *file,
args.out_numargs = 1;
args.out_args[0].size = sizeof(outarg);
args.out_args[0].value = &outarg;
- err = fuse_simple_request(fm, &args);
+ err = fuse_simple_request(NULL, fm, &args);
if (err)
return err;

@@ -1268,7 +1268,7 @@ static int fuse_do_getattr(struct inode *inode, struct kstat *stat,
args.out_numargs = 1;
args.out_args[0].size = sizeof(outarg);
args.out_args[0].value = &outarg;
- err = fuse_simple_request(fm, &args);
+ err = fuse_simple_request(NULL, fm, &args);
if (!err) {
if (fuse_invalid_attr(&outarg.attr) ||
inode_wrong_type(inode, outarg.attr.mode)) {
@@ -1472,7 +1472,7 @@ static int fuse_access(struct inode *inode, int mask)
args.in_numargs = 1;
args.in_args[0].size = sizeof(inarg);
args.in_args[0].value = &inarg;
- err = fuse_simple_request(fm, &args);
+ err = fuse_simple_request(NULL, fm, &args);
if (err == -ENOSYS) {
fm->fc->no_access = 1;
err = 0;
@@ -1584,7 +1584,7 @@ static int fuse_readlink_page(struct inode *inode, struct page *page)
ap.args.page_zeroing = true;
ap.args.out_numargs = 1;
ap.args.out_args[0].size = desc.length;
- res = fuse_simple_request(fm, &ap.args);
+ res = fuse_simple_request(NULL, fm, &ap.args);

fuse_invalidate_atime(inode);

@@ -1857,7 +1857,7 @@ int fuse_flush_times(struct inode *inode, struct fuse_file *ff)
}
fuse_setattr_fill(fm->fc, &args, inode, &inarg, &outarg);

- return fuse_simple_request(fm, &args);
+ return fuse_simple_request(NULL, fm, &args);
}

/*
@@ -1970,7 +1970,7 @@ int fuse_do_setattr(struct dentry *dentry, struct iattr *attr,
inarg.valid |= FATTR_KILL_SUIDGID;
}
fuse_setattr_fill(fc, &args, inode, &inarg, &outarg);
- err = fuse_simple_request(fm, &args);
+ err = fuse_simple_request(NULL, fm, &args);
if (err) {
if (err == -EINTR)
fuse_invalidate_attr(inode);
diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index f39456c65ed7..7d14d533dad1 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -48,7 +48,7 @@ static int fuse_send_open(struct fuse_mount *fm, u64 nodeid,
args.out_args[0].size = sizeof(*outargp);
args.out_args[0].value = outargp;

- return fuse_simple_request(fm, &args);
+ return fuse_simple_request(NULL, fm, &args);
}

struct fuse_file *fuse_file_alloc(struct fuse_mount *fm, bool release)
@@ -111,7 +111,7 @@ static void fuse_file_put(struct fuse_file *ff, bool sync)
if (!args) {
/* Do nothing when server does not implement 'open' */
} else if (sync) {
- fuse_simple_request(ff->fm, args);
+ fuse_simple_request(NULL, ff->fm, args);
fuse_release_end(ff->fm, args, 0);
} else {
args->end = fuse_release_end;
@@ -539,7 +539,7 @@ static int fuse_flush(struct file *file, fl_owner_t id)
args.in_args[0].value = &inarg;
args.force = true;

- err = fuse_simple_request(fm, &args);
+ err = fuse_simple_request(NULL, fm, &args);
if (err == -ENOSYS) {
fm->fc->no_flush = 1;
err = 0;
@@ -572,7 +572,7 @@ int fuse_fsync_common(struct file *file, loff_t start, loff_t end,
args.in_numargs = 1;
args.in_args[0].size = sizeof(inarg);
args.in_args[0].value = &inarg;
- return fuse_simple_request(fm, &args);
+ return fuse_simple_request(NULL, fm, &args);
}

static int fuse_fsync(struct file *file, loff_t start, loff_t end,
@@ -814,7 +814,7 @@ static ssize_t fuse_send_read(struct fuse_io_args *ia, loff_t pos, size_t count,
if (ia->io->async)
return fuse_async_req_send(fm, ia, count);

- return fuse_simple_request(fm, &ia->ap.args);
+ return fuse_simple_request(NULL, fm, &ia->ap.args);
}

static void fuse_read_update_size(struct inode *inode, loff_t size,
@@ -878,7 +878,7 @@ static int fuse_do_readpage(struct file *file, struct page *page)
desc.length--;

fuse_read_args_fill(&ia, file, pos, desc.length, FUSE_READ);
- res = fuse_simple_request(fm, &ia.ap.args);
+ res = fuse_simple_request(NULL, fm, &ia.ap.args);
if (res < 0)
return res;
/*
@@ -976,7 +976,7 @@ static void fuse_send_readpages(struct fuse_io_args *ia, struct file *file)
if (!err)
return;
} else {
- res = fuse_simple_request(fm, &ap->args);
+ res = fuse_simple_request(NULL, fm, &ap->args);
err = res < 0 ? res : 0;
}
fuse_readpages_end(fm, &ap->args, err);
@@ -1101,7 +1101,7 @@ static ssize_t fuse_send_write(struct fuse_io_args *ia, loff_t pos,
if (ia->io->async)
return fuse_async_req_send(fm, ia, count);

- err = fuse_simple_request(fm, &ia->ap.args);
+ err = fuse_simple_request(NULL, fm, &ia->ap.args);
if (!err && ia->write.out.size > count)
err = -EIO;

@@ -1147,7 +1147,7 @@ static ssize_t fuse_send_write_pages(struct fuse_io_args *ia,
if (fm->fc->handle_killpriv_v2 && !capable(CAP_FSETID))
ia->write.in.write_flags |= FUSE_WRITE_KILL_SUIDGID;

- err = fuse_simple_request(fm, &ap->args);
+ err = fuse_simple_request(NULL, fm, &ap->args);
if (!err && ia->write.out.size > count)
err = -EIO;

@@ -2656,7 +2656,7 @@ static int fuse_getlk(struct file *file, struct file_lock *fl)
args.out_numargs = 1;
args.out_args[0].size = sizeof(outarg);
args.out_args[0].value = &outarg;
- err = fuse_simple_request(fm, &args);
+ err = fuse_simple_request(NULL, fm, &args);
if (!err)
err = convert_fuse_file_lock(fm->fc, &outarg.lk, fl);

@@ -2680,7 +2680,7 @@ static int fuse_setlk(struct file *file, struct file_lock *fl, int flock)
}

fuse_lk_fill(&args, file, fl, opcode, pid_nr, flock, &inarg);
- err = fuse_simple_request(fm, &args);
+ err = fuse_simple_request(NULL, fm, &args);

/* locking is restartable */
if (err == -EINTR)
@@ -2754,7 +2754,7 @@ static sector_t fuse_bmap(struct address_space *mapping, sector_t block)
args.out_numargs = 1;
args.out_args[0].size = sizeof(outarg);
args.out_args[0].value = &outarg;
- err = fuse_simple_request(fm, &args);
+ err = fuse_simple_request(NULL, fm, &args);
if (err == -ENOSYS)
fm->fc->no_bmap = 1;

@@ -2786,7 +2786,7 @@ static loff_t fuse_lseek(struct file *file, loff_t offset, int whence)
args.out_numargs = 1;
args.out_args[0].size = sizeof(outarg);
args.out_args[0].value = &outarg;
- err = fuse_simple_request(fm, &args);
+ err = fuse_simple_request(NULL, fm, &args);
if (err) {
if (err == -ENOSYS) {
fm->fc->no_lseek = 1;
@@ -2919,7 +2919,7 @@ __poll_t fuse_file_poll(struct file *file, poll_table *wait)
args.out_numargs = 1;
args.out_args[0].size = sizeof(outarg);
args.out_args[0].value = &outarg;
- err = fuse_simple_request(fm, &args);
+ err = fuse_simple_request(NULL, fm, &args);

if (!err)
return demangle_poll(outarg.revents);
@@ -3141,7 +3141,7 @@ static long fuse_file_fallocate(struct file *file, int mode, loff_t offset,
args.in_numargs = 1;
args.in_args[0].size = sizeof(inarg);
args.in_args[0].value = &inarg;
- err = fuse_simple_request(fm, &args);
+ err = fuse_simple_request(NULL, fm, &args);
if (err == -ENOSYS) {
fm->fc->no_fallocate = 1;
err = -EOPNOTSUPP;
@@ -3253,7 +3253,7 @@ static ssize_t __fuse_copy_file_range(struct file *file_in, loff_t pos_in,
args.out_numargs = 1;
args.out_args[0].size = sizeof(outarg);
args.out_args[0].value = &outarg;
- err = fuse_simple_request(fm, &args);
+ err = fuse_simple_request(NULL, fm, &args);
if (err == -ENOSYS) {
fc->no_copy_file_range = 1;
err = -EOPNOTSUPP;
diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
index f23919610313..656575e3e4cf 100644
--- a/fs/fuse/fuse_i.h
+++ b/fs/fuse/fuse_i.h
@@ -1154,7 +1154,8 @@ void __exit fuse_ctl_cleanup(void);
/**
* Simple request sending that does request allocation and freeing
*/
-ssize_t fuse_simple_request(struct fuse_mount *fm, struct fuse_args *args);
+ssize_t fuse_simple_request(struct mnt_idmap *idmap, struct fuse_mount *fm,
+ struct fuse_args *args);
int fuse_simple_background(struct fuse_mount *fm, struct fuse_args *args,
gfp_t gfp_flags);

diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index 115538f6f283..2e26810066e8 100644
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -586,7 +586,7 @@ static void fuse_send_destroy(struct fuse_mount *fm)
args.opcode = FUSE_DESTROY;
args.force = true;
args.nocreds = true;
- fuse_simple_request(fm, &args);
+ fuse_simple_request(NULL, fm, &args);
}
}

@@ -624,7 +624,7 @@ static int fuse_statfs(struct dentry *dentry, struct kstatfs *buf)
args.out_numargs = 1;
args.out_args[0].size = sizeof(outarg);
args.out_args[0].value = &outarg;
- err = fuse_simple_request(fm, &args);
+ err = fuse_simple_request(NULL, fm, &args);
if (!err)
convert_fuse_statfs(buf, &outarg.st);
return err;
@@ -713,7 +713,7 @@ static int fuse_sync_fs(struct super_block *sb, int wait)
args.nodeid = get_node_id(sb->s_root->d_inode);
args.out_numargs = 0;

- err = fuse_simple_request(fm, &args);
+ err = fuse_simple_request(NULL, fm, &args);
if (err == -ENOSYS) {
fc->sync_fs = 0;
err = 0;
diff --git a/fs/fuse/ioctl.c b/fs/fuse/ioctl.c
index 572ce8a82ceb..b40dd931167d 100644
--- a/fs/fuse/ioctl.c
+++ b/fs/fuse/ioctl.c
@@ -18,7 +18,7 @@ static ssize_t fuse_send_ioctl(struct fuse_mount *fm, struct fuse_args *args,
args->out_args[0].size = sizeof(*outarg);
args->out_args[0].value = outarg;

- ret = fuse_simple_request(fm, args);
+ ret = fuse_simple_request(NULL, fm, args);

/* Translate ENOSYS, which shouldn't be returned from fs */
if (ret == -ENOSYS)
diff --git a/fs/fuse/readdir.c b/fs/fuse/readdir.c
index 0377b6dc24c8..e8a093289421 100644
--- a/fs/fuse/readdir.c
+++ b/fs/fuse/readdir.c
@@ -279,7 +279,7 @@ static void fuse_force_forget(struct file *file, u64 nodeid)
args.force = true;
args.noreply = true;

- fuse_simple_request(fm, &args);
+ fuse_simple_request(NULL, fm, &args);
/* ignore errors */
}

@@ -358,7 +358,7 @@ static int fuse_readdir_uncached(struct file *file, struct dir_context *ctx)
FUSE_READDIR);
}
locked = fuse_lock_inode(inode);
- res = fuse_simple_request(fm, &ap->args);
+ res = fuse_simple_request(NULL, fm, &ap->args);
fuse_unlock_inode(inode, locked);
if (res >= 0) {
if (!res) {
diff --git a/fs/fuse/xattr.c b/fs/fuse/xattr.c
index 5b423fdbb13f..6f8f1453b550 100644
--- a/fs/fuse/xattr.c
+++ b/fs/fuse/xattr.c
@@ -37,7 +37,7 @@ int fuse_setxattr(struct inode *inode, const char *name, const void *value,
args.in_args[1].value = name;
args.in_args[2].size = size;
args.in_args[2].value = value;
- err = fuse_simple_request(fm, &args);
+ err = fuse_simple_request(NULL, fm, &args);
if (err == -ENOSYS) {
fm->fc->no_setxattr = 1;
err = -EOPNOTSUPP;
@@ -79,7 +79,7 @@ ssize_t fuse_getxattr(struct inode *inode, const char *name, void *value,
args.out_args[0].size = sizeof(outarg);
args.out_args[0].value = &outarg;
}
- ret = fuse_simple_request(fm, &args);
+ ret = fuse_simple_request(NULL, fm, &args);
if (!ret && !size)
ret = min_t(ssize_t, outarg.size, XATTR_SIZE_MAX);
if (ret == -ENOSYS) {
@@ -141,7 +141,7 @@ ssize_t fuse_listxattr(struct dentry *entry, char *list, size_t size)
args.out_args[0].size = sizeof(outarg);
args.out_args[0].value = &outarg;
}
- ret = fuse_simple_request(fm, &args);
+ ret = fuse_simple_request(NULL, fm, &args);
if (!ret && !size)
ret = min_t(ssize_t, outarg.size, XATTR_LIST_MAX);
if (ret > 0 && size)
@@ -167,7 +167,7 @@ int fuse_removexattr(struct inode *inode, const char *name)
args.in_numargs = 1;
args.in_args[0].size = strlen(name) + 1;
args.in_args[0].value = name;
- err = fuse_simple_request(fm, &args);
+ err = fuse_simple_request(NULL, fm, &args);
if (err == -ENOSYS) {
fm->fc->no_removexattr = 1;
err = -EOPNOTSUPP;
--
2.34.1