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fs/fuse: convert to use invalid_mnt_idmap

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We should convert fs/fuse code to use a newly introduced
invalid_mnt_idmap instead of passing a NULL as idmap pointer.

Suggested-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Alexander Mikhalitsyn <aleksandr.mikhalitsyn@canonical.com>
Reviewed-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Alexander Mikhalitsyn 2024-09-06 16:34:53 +02:00 committed by Miklos Szeredi
parent ffcdc4c628
commit 106e4593ed
3 changed files with 27 additions and 28 deletions
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47
fs/fuse/dev.c
View File

@ -114,7 +114,11 @@ static struct fuse_req *fuse_get_req(struct mnt_idmap *idmap,
{
struct fuse_conn *fc = fm->fc;
struct fuse_req *req;
bool no_idmap = !fm->sb || (fm->sb->s_iflags & SB_I_NOIDMAP);
kuid_t fsuid;
kgid_t fsgid;
int err;
atomic_inc(&fc->num_waiting);
if (fuse_block_alloc(fc, for_background)) {
@ -148,29 +152,24 @@ static struct fuse_req *fuse_get_req(struct mnt_idmap *idmap,
if (for_background)
__set_bit(FR_BACKGROUND, &req->flags);
if (!fm->sb || (fm->sb->s_iflags & SB_I_NOIDMAP) || idmap) {
kuid_t idmapped_fsuid;
kgid_t idmapped_fsgid;
/*
* Keep the old behavior when idmappings support was not
* declared by a FUSE server.
*
* For those FUSE servers who support idmapped mounts,
* we send UID/GID only along with "inode creation"
* fuse requests, otherwise idmap == &invalid_mnt_idmap and
* req->in.h.{u,g}id will be equal to FUSE_INVALID_UIDGID.
*/
fsuid = no_idmap ? current_fsuid() : mapped_fsuid(idmap, fc->user_ns);
fsgid = no_idmap ? current_fsgid() : mapped_fsgid(idmap, fc->user_ns);
req->in.h.uid = from_kuid(fc->user_ns, fsuid);
req->in.h.gid = from_kgid(fc->user_ns, fsgid);
/*
* Note, that when
* (fm->sb->s_iflags & SB_I_NOIDMAP) is true, then
* (idmap == &nop_mnt_idmap) is always true and therefore,
* mapped_fsuid(idmap, fc->user_ns) == current_fsuid().
*/
idmapped_fsuid = idmap ? mapped_fsuid(idmap, fc->user_ns) : current_fsuid();
idmapped_fsgid = idmap ? mapped_fsgid(idmap, fc->user_ns) : current_fsgid();
req->in.h.uid = from_kuid(fc->user_ns, idmapped_fsuid);
req->in.h.gid = from_kgid(fc->user_ns, idmapped_fsgid);
if (unlikely(req->in.h.uid == ((uid_t)-1) ||
req->in.h.gid == ((gid_t)-1))) {
fuse_put_request(req);
return ERR_PTR(-EOVERFLOW);
}
} else {
req->in.h.uid = FUSE_INVALID_UIDGID;
req->in.h.gid = FUSE_INVALID_UIDGID;
if (no_idmap && unlikely(req->in.h.uid == ((uid_t)-1) ||
req->in.h.gid == ((gid_t)-1))) {
fuse_put_request(req);
return ERR_PTR(-EOVERFLOW);
}
return req;
@ -619,7 +618,7 @@ int fuse_simple_background(struct fuse_mount *fm, struct fuse_args *args,
__set_bit(FR_BACKGROUND, &req->flags);
} else {
WARN_ON(args->nocreds);
req = fuse_get_req(NULL, fm, true);
req = fuse_get_req(&invalid_mnt_idmap, fm, true);
if (IS_ERR(req))
return PTR_ERR(req);
}
@ -641,7 +640,7 @@ static int fuse_simple_notify_reply(struct fuse_mount *fm,
struct fuse_req *req;
struct fuse_iqueue *fiq = &fm->fc->iq;
req = fuse_get_req(NULL, fm, false);
req = fuse_get_req(&invalid_mnt_idmap, fm, false);
if (IS_ERR(req))
return PTR_ERR(req);

6
fs/fuse/dir.c
View File

@ -1093,7 +1093,7 @@ static int fuse_rename2(struct mnt_idmap *idmap, struct inode *olddir,
if (fc->no_rename2 || fc->minor < 23)
return -EINVAL;
err = fuse_rename_common((flags & RENAME_WHITEOUT) ? idmap : NULL,
err = fuse_rename_common((flags & RENAME_WHITEOUT) ? idmap : &invalid_mnt_idmap,
olddir, oldent, newdir, newent, flags,
FUSE_RENAME2,
sizeof(struct fuse_rename2_in));
@ -1102,7 +1102,7 @@ static int fuse_rename2(struct mnt_idmap *idmap, struct inode *olddir,
err = -EINVAL;
}
} else {
err = fuse_rename_common(NULL, olddir, oldent, newdir, newent, 0,
err = fuse_rename_common(&invalid_mnt_idmap, olddir, oldent, newdir, newent, 0,
FUSE_RENAME,
sizeof(struct fuse_rename_in));
}
@ -1127,7 +1127,7 @@ static int fuse_link(struct dentry *entry, struct inode *newdir,
args.in_args[0].value = &inarg;
args.in_args[1].size = newent->d_name.len + 1;
args.in_args[1].value = newent->d_name.name;
err = create_new_entry(NULL, fm, &args, newdir, newent, inode->i_mode);
err = create_new_entry(&invalid_mnt_idmap, fm, &args, newdir, newent, inode->i_mode);
if (!err)
fuse_update_ctime_in_cache(inode);
else if (err == -EINTR)

2
fs/fuse/fuse_i.h
View File

@ -1153,7 +1153,7 @@ ssize_t __fuse_simple_request(struct mnt_idmap *idmap,
static inline ssize_t fuse_simple_request(struct fuse_mount *fm, struct fuse_args *args)
{
return __fuse_simple_request(NULL, fm, args);
return __fuse_simple_request(&invalid_mnt_idmap, fm, args);
}
static inline ssize_t fuse_simple_idmap_request(struct mnt_idmap *idmap,