Signed-off-by: Daniel Rosenberg <drosen@xxxxxxxxxx>
Signed-off-by: Paul Lawrence <paullawrence@xxxxxxxxxx>
---
fs/fuse/backing.c | 257 ++++++++++++++++++++++++++++++++++++++++++++++
fs/fuse/fuse_i.h | 55 ++++++++++
fs/fuse/xattr.c | 36 +++++++
3 files changed, 348 insertions(+)
diff --git a/fs/fuse/backing.c b/fs/fuse/backing.c
index 8fd5cbfdd4fa..d8c86234f253 100644
--- a/fs/fuse/backing.c
+++ b/fs/fuse/backing.c
@@ -695,6 +695,263 @@ int fuse_dir_fsync_initialize_out(struct bpf_fuse_args *fa, struct fuse_fsync_in
return 0;
}
+int fuse_getxattr_initialize_in(struct bpf_fuse_args *fa,
+ struct fuse_getxattr_io *fgio,
+ struct dentry *dentry, const char *name, void *value,
+ size_t size)
+{
+ *fgio = (struct fuse_getxattr_io) {
+ .fgi.size = size,
+ };
+
+ *fa = (struct bpf_fuse_args) {
+ .nodeid = get_fuse_inode(dentry->d_inode)->nodeid,
+ .opcode = FUSE_GETXATTR,
+ .in_numargs = 2,
+ .in_args[0] = (struct bpf_fuse_arg) {
+ .size = sizeof(fgio->fgi),
+ .value = &fgio->fgi,
+ },
+ .in_args[1] = (struct bpf_fuse_arg) {
+ .size = strlen(name) + 1,
+ .max_size = XATTR_NAME_MAX + 1,
+ .flags = BPF_FUSE_MUST_ALLOCATE | BPF_FUSE_VARIABLE_SIZE,
+ .value = (void *) name,
+ },
+ };
+
+ return 0;
+}
+
+int fuse_getxattr_initialize_out(struct bpf_fuse_args *fa,
+ struct fuse_getxattr_io *fgio,
+ struct dentry *dentry, const char *name, void *value,
+ size_t size)
+{
+ fa->flags = size ? FUSE_BPF_OUT_ARGVAR : 0;
+ fa->out_numargs = 1;
+ if (size) {
+ fa->out_args[0].size = size;
+ fa->out_args[0].max_size = size;
+ fa->out_args[0].flags = BPF_FUSE_VARIABLE_SIZE;
+ fa->out_args[0].value = value;
+ } else {
+ fa->out_args[0].size = sizeof(fgio->fgo);
+ fa->out_args[0].value = &fgio->fgo;
+ }
+ return 0;
+}
+
+int fuse_getxattr_backing(struct bpf_fuse_args *fa, int *out,
+ struct dentry *dentry, const char *name, void *value,
+ size_t size)
+{
+ ssize_t ret = vfs_getxattr(&init_user_ns,
+ get_fuse_dentry(dentry)->backing_path.dentry,
+ fa->in_args[1].value, value, size);
+
+ if (fa->flags & FUSE_BPF_OUT_ARGVAR)
+ fa->out_args[0].size = ret;
+ else
+ ((struct fuse_getxattr_out *)fa->out_args[0].value)->size = ret;
+
+ return 0;
+}
+
+int fuse_getxattr_finalize(struct bpf_fuse_args *fa, int *out,
+ struct dentry *dentry, const char *name, void *value,
+ size_t size)
+{
+ struct fuse_getxattr_out *fgo;
+
+ if (fa->flags & FUSE_BPF_OUT_ARGVAR) {
+ *out = fa->out_args[0].size;
+ return 0;
+ }
+
+ fgo = fa->out_args[0].value;
+
+ *out = fgo->size;
+ return 0;
+}
+
+int fuse_listxattr_initialize_in(struct bpf_fuse_args *fa,
+ struct fuse_getxattr_io *fgio,
+ struct dentry *dentry, char *list, size_t size)
+{
+ *fgio = (struct fuse_getxattr_io) {
+ .fgi.size = size,
+ };
+
+ *fa = (struct bpf_fuse_args) {
+ .nodeid = get_fuse_inode(dentry->d_inode)->nodeid,
+ .opcode = FUSE_LISTXATTR,
+ .in_numargs = 1,
+ .in_args[0] =
+ (struct bpf_fuse_arg) {
+ .size = sizeof(fgio->fgi),
+ .value = &fgio->fgi,
+ },
+ };
+
+ return 0;
+}
+
+int fuse_listxattr_initialize_out(struct bpf_fuse_args *fa,
+ struct fuse_getxattr_io *fgio,
+ struct dentry *dentry, char *list, size_t size)
+{
+ fa->out_numargs = 1;
+
+ if (size) {
+ fa->flags = FUSE_BPF_OUT_ARGVAR;
+ fa->out_args[0].size = size;
+ fa->out_args[0].max_size = size;
+ fa->out_args[0].flags = BPF_FUSE_VARIABLE_SIZE;
+ fa->out_args[0].value = (void *)list;
+ } else {
+ fa->out_args[0].size = sizeof(fgio->fgo);
+ fa->out_args[0].value = &fgio->fgo;
+ }
+ return 0;
+}
+
+int fuse_listxattr_backing(struct bpf_fuse_args *fa, ssize_t *out, struct dentry *dentry,
+ char *list, size_t size)
+{
+ *out = vfs_listxattr(get_fuse_dentry(dentry)->backing_path.dentry, list, size);
+
+ if (*out < 0)
+ return *out;
+
+ if (fa->flags & FUSE_BPF_OUT_ARGVAR)
+ fa->out_args[0].size = *out;
+ else
+ ((struct fuse_getxattr_out *)fa->out_args[0].value)->size = *out;
+
+ return 0;
+}
+
+int fuse_listxattr_finalize(struct bpf_fuse_args *fa, ssize_t *out, struct dentry *dentry,
+ char *list, size_t size)
+{
+ struct fuse_getxattr_out *fgo;
+
+ if (fa->error_in)
+ return 0;
+
+ if (fa->flags & FUSE_BPF_OUT_ARGVAR) {
+ *out = fa->out_args[0].size;
+ return 0;
+ }
+
+ fgo = fa->out_args[0].value;
+ *out = fgo->size;
+ return 0;
+}
+
+int fuse_setxattr_initialize_in(struct bpf_fuse_args *fa,
+ struct fuse_setxattr_in *fsxi,
+ struct dentry *dentry, const char *name,
+ const void *value, size_t size, int flags)
+{
+ *fsxi = (struct fuse_setxattr_in) {
+ .size = size,
+ .flags = flags,
+ };
+
+ *fa = (struct bpf_fuse_args) {
+ .nodeid = get_fuse_inode(dentry->d_inode)->nodeid,
+ .opcode = FUSE_SETXATTR,
+ .in_numargs = 3,
+ .in_args[0] = (struct bpf_fuse_arg) {
+ .size = sizeof(*fsxi),
+ .value = fsxi,
+ },
+ .in_args[1] = (struct bpf_fuse_arg) {
+ .size = strlen(name) + 1,
+ .max_size = XATTR_NAME_MAX + 1,
+ .flags = BPF_FUSE_VARIABLE_SIZE | BPF_FUSE_MUST_ALLOCATE,
+ .value = (void *) name,
+ },
+ .in_args[2] = (struct bpf_fuse_arg) {
+ .size = size,
+ .max_size = XATTR_SIZE_MAX,
+ .flags = BPF_FUSE_VARIABLE_SIZE | BPF_FUSE_MUST_ALLOCATE,
+ .value = (void *) value,
+ },
+ };
+
+ return 0;
+}
+
+int fuse_setxattr_initialize_out(struct bpf_fuse_args *fa,
+ struct fuse_setxattr_in *fsxi,
+ struct dentry *dentry, const char *name,
+ const void *value, size_t size, int flags)
+{
+ return 0;
+}
+
+int fuse_setxattr_backing(struct bpf_fuse_args *fa, int *out, struct dentry *dentry,
+ const char *name, const void *value, size_t size,
+ int flags)
+{
+ *out = vfs_setxattr(&init_user_ns,
+ get_fuse_dentry(dentry)->backing_path.dentry, name,
+ (void *) value, size, flags);
+ return 0;
+}
+
+int fuse_setxattr_finalize(struct bpf_fuse_args *fa, int *out, struct dentry *dentry,
+ const char *name, const void *value, size_t size,
+ int flags)
+{
+ return 0;
+}
+
+int fuse_removexattr_initialize_in(struct bpf_fuse_args *fa,
+ struct fuse_dummy_io *unused,
+ struct dentry *dentry, const char *name)
+{
+ *fa = (struct bpf_fuse_args) {
+ .nodeid = get_fuse_inode(dentry->d_inode)->nodeid,
+ .opcode = FUSE_REMOVEXATTR,
+ .in_numargs = 1,
+ .in_args[0] = (struct bpf_fuse_arg) {
+ .size = strlen(name) + 1,
+ .max_size = XATTR_NAME_MAX + 1,
+ .flags = BPF_FUSE_VARIABLE_SIZE | BPF_FUSE_MUST_ALLOCATE,
+ .value = (void *) name,
+ },
+ };
+
+ return 0;
+}
+
+int fuse_removexattr_initialize_out(struct bpf_fuse_args *fa,
+ struct fuse_dummy_io *unused,
+ struct dentry *dentry, const char *name)
+{
+ return 0;
+}
+
+int fuse_removexattr_backing(struct bpf_fuse_args *fa, int *out,
+ struct dentry *dentry, const char *name)
+{
+ struct path *backing_path = &get_fuse_dentry(dentry)->backing_path;
+
+ /* TODO account for changes of the name by prefilter */
+ *out = vfs_removexattr(&init_user_ns, backing_path->dentry, name);
+ return 0;
+}
+
+int fuse_removexattr_finalize(struct bpf_fuse_args *fa, int *out,
+ struct dentry *dentry, const char *name)
+{
+ return 0;
+}
+
static inline void fuse_bpf_aio_put(struct fuse_bpf_aio_req *aio_req)
{
if (refcount_dec_and_test(&aio_req->ref))
diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
index 370fe944387e..b313a45c7774 100644
--- a/fs/fuse/fuse_i.h
+++ b/fs/fuse/fuse_i.h
@@ -1578,6 +1578,61 @@ int fuse_dir_fsync_initialize_in(struct bpf_fuse_args *fa, struct fuse_fsync_in
int fuse_dir_fsync_initialize_out(struct bpf_fuse_args *fa, struct fuse_fsync_in *ffi,
struct file *file, loff_t start, loff_t end, int datasync);
+struct fuse_getxattr_io {
+ struct fuse_getxattr_in fgi;
+ struct fuse_getxattr_out fgo;
+};
+
+int fuse_getxattr_initialize_in(struct bpf_fuse_args *fa, struct fuse_getxattr_io *fgio,
+ struct dentry *dentry, const char *name, void *value,
+ size_t size);
+int fuse_getxattr_initialize_out(struct bpf_fuse_args *fa, struct fuse_getxattr_io *fgio,
+ struct dentry *dentry, const char *name, void *value,
+ size_t size);
+int fuse_getxattr_backing(struct bpf_fuse_args *fa, int *out,
+ struct dentry *dentry, const char *name, void *value,
+ size_t size);
+int fuse_getxattr_finalize(struct bpf_fuse_args *fa, int *out,
+ struct dentry *dentry, const char *name, void *value,
+ size_t size);
+
+int fuse_listxattr_initialize_in(struct bpf_fuse_args *fa,
+ struct fuse_getxattr_io *fgio,
+ struct dentry *dentry, char *list, size_t size);
+int fuse_listxattr_initialize_out(struct bpf_fuse_args *fa,
+ struct fuse_getxattr_io *fgio,
+ struct dentry *dentry, char *list, size_t size);
+int fuse_listxattr_backing(struct bpf_fuse_args *fa, ssize_t *out, struct dentry *dentry,
+ char *list, size_t size);
+int fuse_listxattr_finalize(struct bpf_fuse_args *fa, ssize_t *out, struct dentry *dentry,
+ char *list, size_t size);
+
+int fuse_setxattr_initialize_in(struct bpf_fuse_args *fa,
+ struct fuse_setxattr_in *fsxi,
+ struct dentry *dentry, const char *name,
+ const void *value, size_t size, int flags);
+int fuse_setxattr_initialize_out(struct bpf_fuse_args *fa,
+ struct fuse_setxattr_in *fsxi,
+ struct dentry *dentry, const char *name,
+ const void *value, size_t size, int flags);
+int fuse_setxattr_backing(struct bpf_fuse_args *fa, int *out, struct dentry *dentry,
+ const char *name, const void *value, size_t size,
+ int flags);
+int fuse_setxattr_finalize(struct bpf_fuse_args *fa, int *out, struct dentry *dentry,
+ const char *name, const void *value, size_t size,
+ int flags);
+
+int fuse_removexattr_initialize_in(struct bpf_fuse_args *fa,
+ struct fuse_dummy_io *unused,
+ struct dentry *dentry, const char *name);
+int fuse_removexattr_initialize_out(struct bpf_fuse_args *fa,
+ struct fuse_dummy_io *unused,
+ struct dentry *dentry, const char *name);
+int fuse_removexattr_backing(struct bpf_fuse_args *fa, int *out,
+ struct dentry *dentry, const char *name);
+int fuse_removexattr_finalize(struct bpf_fuse_args *fa, int *out,
+ struct dentry *dentry, const char *name);
+
struct fuse_read_iter_out {
uint64_t ret;
};
diff --git a/fs/fuse/xattr.c b/fs/fuse/xattr.c
index 0d3e7177fce0..96728bd907ce 100644
--- a/fs/fuse/xattr.c
+++ b/fs/fuse/xattr.c
@@ -115,6 +115,14 @@ ssize_t fuse_listxattr(struct dentry *entry, char *list, size_t size)
struct fuse_getxattr_out outarg;
ssize_t ret;
+#ifdef CONFIG_FUSE_BPF
+ if (fuse_bpf_backing(inode, struct fuse_getxattr_io, ret,
+ fuse_listxattr_initialize_in, fuse_listxattr_initialize_out,
+ fuse_listxattr_backing, fuse_listxattr_finalize,
+ entry, list, size))
+ return ret;
+#endif
+
if (fuse_is_bad(inode))
return -EIO;
@@ -182,6 +190,16 @@ static int fuse_xattr_get(const struct xattr_handler *handler,
struct dentry *dentry, struct inode *inode,
const char *name, void *value, size_t size)
{
+#ifdef CONFIG_FUSE_BPF
+ int err;
+
+ if (fuse_bpf_backing(inode, struct fuse_getxattr_io, err,
+ fuse_getxattr_initialize_in, fuse_getxattr_initialize_out,
+ fuse_getxattr_backing, fuse_getxattr_finalize,
+ dentry, name, value, size))
+ return err;
+#endif
+
if (fuse_is_bad(inode))
return -EIO;
@@ -194,6 +212,24 @@ static int fuse_xattr_set(const struct xattr_handler *handler,
const char *name, const void *value, size_t size,
int flags)
{
+#ifdef CONFIG_FUSE_BPF
+ int err;
+ bool handled;
+
+ if (value)
+ handled = fuse_bpf_backing(inode, struct fuse_setxattr_in, err,
+ fuse_setxattr_initialize_in, fuse_setxattr_initialize_out,
+ fuse_setxattr_backing, fuse_setxattr_finalize,
+ dentry, name, value, size, flags);
+ else
+ handled = fuse_bpf_backing(inode, struct fuse_dummy_io, err,
+ fuse_removexattr_initialize_in, fuse_removexattr_initialize_out,
+ fuse_removexattr_backing, fuse_removexattr_finalize,
+ dentry, name);
+ if (handled)
+ return err;
+#endif
+
if (fuse_is_bad(inode))
return -EIO;
--
2.37.3.998.g577e59143f-goog
