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Diffstat (limited to 'fs/fuse/inode.c')
-rw-r--r--fs/fuse/inode.c113
1 files changed, 81 insertions, 32 deletions
diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index 735abf426a06..fd3321e29a3e 100644
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -111,6 +111,9 @@ static struct inode *fuse_alloc_inode(struct super_block *sb)
if (IS_ENABLED(CONFIG_FUSE_DAX) && !fuse_dax_inode_alloc(sb, fi))
goto out_free_forget;
+ if (IS_ENABLED(CONFIG_FUSE_PASSTHROUGH))
+ fuse_inode_backing_set(fi, NULL);
+
return &fi->inode;
out_free_forget:
@@ -129,6 +132,9 @@ static void fuse_free_inode(struct inode *inode)
#ifdef CONFIG_FUSE_DAX
kfree(fi->dax);
#endif
+ if (IS_ENABLED(CONFIG_FUSE_PASSTHROUGH))
+ fuse_backing_put(fuse_inode_backing(fi));
+
kmem_cache_free(fuse_inode_cachep, fi);
}
@@ -169,6 +175,7 @@ static void fuse_evict_inode(struct inode *inode)
}
}
if (S_ISREG(inode->i_mode) && !fuse_is_bad(inode)) {
+ WARN_ON(fi->iocachectr != 0);
WARN_ON(!list_empty(&fi->write_files));
WARN_ON(!list_empty(&fi->queued_writes));
}
@@ -223,12 +230,10 @@ void fuse_change_attributes_common(struct inode *inode, struct fuse_attr *attr,
attr->mtimensec = min_t(u32, attr->mtimensec, NSEC_PER_SEC - 1);
attr->ctimensec = min_t(u32, attr->ctimensec, NSEC_PER_SEC - 1);
- inode->i_atime.tv_sec = attr->atime;
- inode->i_atime.tv_nsec = attr->atimensec;
+ inode_set_atime(inode, attr->atime, attr->atimensec);
/* mtime from server may be stale due to local buffered write */
if (!(cache_mask & STATX_MTIME)) {
- inode->i_mtime.tv_sec = attr->mtime;
- inode->i_mtime.tv_nsec = attr->mtimensec;
+ inode_set_mtime(inode, attr->mtime, attr->mtimensec);
}
if (!(cache_mask & STATX_CTIME)) {
inode_set_ctime(inode, attr->ctime, attr->ctimensec);
@@ -311,12 +316,12 @@ void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr,
attr->size = i_size_read(inode);
if (cache_mask & STATX_MTIME) {
- attr->mtime = inode->i_mtime.tv_sec;
- attr->mtimensec = inode->i_mtime.tv_nsec;
+ attr->mtime = inode_get_mtime_sec(inode);
+ attr->mtimensec = inode_get_mtime_nsec(inode);
}
if (cache_mask & STATX_CTIME) {
- attr->ctime = inode_get_ctime(inode).tv_sec;
- attr->ctimensec = inode_get_ctime(inode).tv_nsec;
+ attr->ctime = inode_get_ctime_sec(inode);
+ attr->ctimensec = inode_get_ctime_nsec(inode);
}
if ((attr_version != 0 && fi->attr_version > attr_version) ||
@@ -325,7 +330,7 @@ void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr,
return;
}
- old_mtime = inode->i_mtime;
+ old_mtime = inode_get_mtime(inode);
fuse_change_attributes_common(inode, attr, sx, attr_valid, cache_mask);
oldsize = inode->i_size;
@@ -379,8 +384,7 @@ static void fuse_init_inode(struct inode *inode, struct fuse_attr *attr,
{
inode->i_mode = attr->mode & S_IFMT;
inode->i_size = attr->size;
- inode->i_mtime.tv_sec = attr->mtime;
- inode->i_mtime.tv_nsec = attr->mtimensec;
+ inode_set_mtime(inode, attr->mtime, attr->mtimensec);
inode_set_ctime(inode, attr->ctime, attr->ctimensec);
if (S_ISREG(inode->i_mode)) {
fuse_init_common(inode);
@@ -736,8 +740,8 @@ static const struct fs_parameter_spec fuse_fs_parameters[] = {
fsparam_string ("source", OPT_SOURCE),
fsparam_u32 ("fd", OPT_FD),
fsparam_u32oct ("rootmode", OPT_ROOTMODE),
- fsparam_u32 ("user_id", OPT_USER_ID),
- fsparam_u32 ("group_id", OPT_GROUP_ID),
+ fsparam_uid ("user_id", OPT_USER_ID),
+ fsparam_gid ("group_id", OPT_GROUP_ID),
fsparam_flag ("default_permissions", OPT_DEFAULT_PERMISSIONS),
fsparam_flag ("allow_other", OPT_ALLOW_OTHER),
fsparam_u32 ("max_read", OPT_MAX_READ),
@@ -797,9 +801,7 @@ static int fuse_parse_param(struct fs_context *fsc, struct fs_parameter *param)
break;
case OPT_USER_ID:
- kuid = make_kuid(fsc->user_ns, result.uint_32);
- if (!uid_valid(kuid))
- return invalfc(fsc, "Invalid user_id");
+ kuid = result.uid;
/*
* The requested uid must be representable in the
* filesystem's idmapping.
@@ -811,9 +813,7 @@ static int fuse_parse_param(struct fs_context *fsc, struct fs_parameter *param)
break;
case OPT_GROUP_ID:
- kgid = make_kgid(fsc->user_ns, result.uint_32);;
- if (!gid_valid(kgid))
- return invalfc(fsc, "Invalid group_id");
+ kgid = result.gid;
/*
* The requested gid must be representable in the
* filesystem's idmapping.
@@ -946,6 +946,9 @@ void fuse_conn_init(struct fuse_conn *fc, struct fuse_mount *fm,
fc->max_pages = FUSE_DEFAULT_MAX_PAGES_PER_REQ;
fc->max_pages_limit = FUSE_MAX_MAX_PAGES;
+ if (IS_ENABLED(CONFIG_FUSE_PASSTHROUGH))
+ fuse_backing_files_init(fc);
+
INIT_LIST_HEAD(&fc->mounts);
list_add(&fm->fc_entry, &fc->mounts);
fm->fc = fc;
@@ -976,6 +979,8 @@ void fuse_conn_put(struct fuse_conn *fc)
WARN_ON(atomic_read(&bucket->count) != 1);
kfree(bucket);
}
+ if (IS_ENABLED(CONFIG_FUSE_PASSTHROUGH))
+ fuse_backing_files_free(fc);
call_rcu(&fc->rcu, delayed_release);
}
}
@@ -996,7 +1001,7 @@ static struct inode *fuse_get_root_inode(struct super_block *sb, unsigned mode)
attr.mode = mode;
attr.ino = FUSE_ROOT_ID;
attr.nlink = 1;
- return fuse_iget(sb, 1, 0, &attr, 0, 0);
+ return fuse_iget(sb, FUSE_ROOT_ID, 0, &attr, 0, 0);
}
struct fuse_inode_handle {
@@ -1080,7 +1085,7 @@ static int fuse_encode_fh(struct inode *inode, u32 *fh, int *max_len,
}
*max_len = len;
- return parent ? 0x82 : 0x81;
+ return parent ? FILEID_INO64_GEN_PARENT : FILEID_INO64_GEN;
}
static struct dentry *fuse_fh_to_dentry(struct super_block *sb,
@@ -1088,7 +1093,8 @@ static struct dentry *fuse_fh_to_dentry(struct super_block *sb,
{
struct fuse_inode_handle handle;
- if ((fh_type != 0x81 && fh_type != 0x82) || fh_len < 3)
+ if ((fh_type != FILEID_INO64_GEN &&
+ fh_type != FILEID_INO64_GEN_PARENT) || fh_len < 3)
return NULL;
handle.nodeid = (u64) fid->raw[0] << 32;
@@ -1102,7 +1108,7 @@ static struct dentry *fuse_fh_to_parent(struct super_block *sb,
{
struct fuse_inode_handle parent;
- if (fh_type != 0x82 || fh_len < 6)
+ if (fh_type != FILEID_INO64_GEN_PARENT || fh_len < 6)
return NULL;
parent.nodeid = (u64) fid->raw[3] << 32;
@@ -1138,6 +1144,11 @@ static struct dentry *fuse_get_parent(struct dentry *child)
return parent;
}
+/* only for fid encoding; no support for file handle */
+static const struct export_operations fuse_export_fid_operations = {
+ .encode_fh = fuse_encode_fh,
+};
+
static const struct export_operations fuse_export_operations = {
.fh_to_dentry = fuse_fh_to_dentry,
.fh_to_parent = fuse_fh_to_parent,
@@ -1312,6 +1323,37 @@ static void process_init_reply(struct fuse_mount *fm, struct fuse_args *args,
fc->create_supp_group = 1;
if (flags & FUSE_DIRECT_IO_ALLOW_MMAP)
fc->direct_io_allow_mmap = 1;
+ /*
+ * max_stack_depth is the max stack depth of FUSE fs,
+ * so it has to be at least 1 to support passthrough
+ * to backing files.
+ *
+ * with max_stack_depth > 1, the backing files can be
+ * on a stacked fs (e.g. overlayfs) themselves and with
+ * max_stack_depth == 1, FUSE fs can be stacked as the
+ * underlying fs of a stacked fs (e.g. overlayfs).
+ *
+ * Also don't allow the combination of FUSE_PASSTHROUGH
+ * and FUSE_WRITEBACK_CACHE, current design doesn't handle
+ * them together.
+ */
+ if (IS_ENABLED(CONFIG_FUSE_PASSTHROUGH) &&
+ (flags & FUSE_PASSTHROUGH) &&
+ arg->max_stack_depth > 0 &&
+ arg->max_stack_depth <= FILESYSTEM_MAX_STACK_DEPTH &&
+ !(flags & FUSE_WRITEBACK_CACHE)) {
+ fc->passthrough = 1;
+ fc->max_stack_depth = arg->max_stack_depth;
+ fm->sb->s_stack_depth = arg->max_stack_depth;
+ }
+ if (flags & FUSE_NO_EXPORT_SUPPORT)
+ fm->sb->s_export_op = &fuse_export_fid_operations;
+ if (flags & FUSE_ALLOW_IDMAP) {
+ if (fc->default_permissions)
+ fm->sb->s_iflags &= ~SB_I_NOIDMAP;
+ else
+ ok = false;
+ }
} else {
ra_pages = fc->max_read / PAGE_SIZE;
fc->no_lock = 1;
@@ -1358,7 +1400,8 @@ void fuse_send_init(struct fuse_mount *fm)
FUSE_NO_OPENDIR_SUPPORT | FUSE_EXPLICIT_INVAL_DATA |
FUSE_HANDLE_KILLPRIV_V2 | FUSE_SETXATTR_EXT | FUSE_INIT_EXT |
FUSE_SECURITY_CTX | FUSE_CREATE_SUPP_GROUP |
- FUSE_HAS_EXPIRE_ONLY | FUSE_DIRECT_IO_ALLOW_MMAP;
+ FUSE_HAS_EXPIRE_ONLY | FUSE_DIRECT_IO_ALLOW_MMAP |
+ FUSE_NO_EXPORT_SUPPORT | FUSE_HAS_RESEND | FUSE_ALLOW_IDMAP;
#ifdef CONFIG_FUSE_DAX
if (fm->fc->dax)
flags |= FUSE_MAP_ALIGNMENT;
@@ -1367,6 +1410,8 @@ void fuse_send_init(struct fuse_mount *fm)
#endif
if (fm->fc->auto_submounts)
flags |= FUSE_SUBMOUNTS;
+ if (IS_ENABLED(CONFIG_FUSE_PASSTHROUGH))
+ flags |= FUSE_PASSTHROUGH;
ia->in.flags = flags;
ia->in.flags2 = flags >> 32;
@@ -1501,22 +1546,24 @@ EXPORT_SYMBOL_GPL(fuse_dev_free);
static void fuse_fill_attr_from_inode(struct fuse_attr *attr,
const struct fuse_inode *fi)
{
+ struct timespec64 atime = inode_get_atime(&fi->inode);
+ struct timespec64 mtime = inode_get_mtime(&fi->inode);
struct timespec64 ctime = inode_get_ctime(&fi->inode);
*attr = (struct fuse_attr){
.ino = fi->inode.i_ino,
.size = fi->inode.i_size,
.blocks = fi->inode.i_blocks,
- .atime = fi->inode.i_atime.tv_sec,
- .mtime = fi->inode.i_mtime.tv_sec,
+ .atime = atime.tv_sec,
+ .mtime = mtime.tv_sec,
.ctime = ctime.tv_sec,
- .atimensec = fi->inode.i_atime.tv_nsec,
- .mtimensec = fi->inode.i_mtime.tv_nsec,
+ .atimensec = atime.tv_nsec,
+ .mtimensec = mtime.tv_nsec,
.ctimensec = ctime.tv_nsec,
.mode = fi->inode.i_mode,
.nlink = fi->inode.i_nlink,
- .uid = fi->inode.i_uid.val,
- .gid = fi->inode.i_gid.val,
+ .uid = __kuid_val(fi->inode.i_uid),
+ .gid = __kgid_val(fi->inode.i_gid),
.rdev = fi->inode.i_rdev,
.blksize = 1u << fi->inode.i_blkbits,
};
@@ -1531,6 +1578,7 @@ static void fuse_sb_defaults(struct super_block *sb)
sb->s_time_gran = 1;
sb->s_export_op = &fuse_export_operations;
sb->s_iflags |= SB_I_IMA_UNVERIFIABLE_SIGNATURE;
+ sb->s_iflags |= SB_I_NOIDMAP;
if (sb->s_user_ns != &init_user_ns)
sb->s_iflags |= SB_I_UNTRUSTED_MOUNTER;
sb->s_flags &= ~(SB_NOSEC | SB_I_VERSION);
@@ -1553,6 +1601,7 @@ static int fuse_fill_super_submount(struct super_block *sb,
sb->s_bdi = bdi_get(parent_sb->s_bdi);
sb->s_xattr = parent_sb->s_xattr;
+ sb->s_export_op = parent_sb->s_export_op;
sb->s_time_gran = parent_sb->s_time_gran;
sb->s_blocksize = parent_sb->s_blocksize;
sb->s_blocksize_bits = parent_sb->s_blocksize_bits;
@@ -1942,7 +1991,7 @@ static void fuse_kill_sb_anon(struct super_block *sb)
static struct file_system_type fuse_fs_type = {
.owner = THIS_MODULE,
.name = "fuse",
- .fs_flags = FS_HAS_SUBTYPE | FS_USERNS_MOUNT,
+ .fs_flags = FS_HAS_SUBTYPE | FS_USERNS_MOUNT | FS_ALLOW_IDMAP,
.init_fs_context = fuse_init_fs_context,
.parameters = fuse_fs_parameters,
.kill_sb = fuse_kill_sb_anon,
@@ -1963,7 +2012,7 @@ static struct file_system_type fuseblk_fs_type = {
.init_fs_context = fuse_init_fs_context,
.parameters = fuse_fs_parameters,
.kill_sb = fuse_kill_sb_blk,
- .fs_flags = FS_REQUIRES_DEV | FS_HAS_SUBTYPE,
+ .fs_flags = FS_REQUIRES_DEV | FS_HAS_SUBTYPE | FS_ALLOW_IDMAP,
};
MODULE_ALIAS_FS("fuseblk");
generated by cgit v1.2.3 (git 2.39.0) at 2025-08-29 08:02:20 +0300