Signed-off-by: Daniel Rosenberg <drosen@xxxxxxxxxx>
Signed-off-by: Paul Lawrence <paullawrence@xxxxxxxxxx>
---
fs/fuse/backing.c | 74 +++++++++++++++++++++++++++++++++++++++++++++++
fs/fuse/file.c | 8 +++++
fs/fuse/fuse_i.h | 15 +++++++++-
3 files changed, 96 insertions(+), 1 deletion(-)
diff --git a/fs/fuse/backing.c b/fs/fuse/backing.c
index fa8805e24061..97e92c633cfd 100644
--- a/fs/fuse/backing.c
+++ b/fs/fuse/backing.c
@@ -77,6 +77,80 @@ int parse_fuse_entry_bpf(struct fuse_entry_bpf *feb)
return err;
}
+int fuse_lseek_initialize_in(struct bpf_fuse_args *fa, struct fuse_lseek_io *flio,
+ struct file *file, loff_t offset, int whence)
+{
+ struct fuse_file *fuse_file = file->private_data;
+
+ flio->fli = (struct fuse_lseek_in) {
+ .fh = fuse_file->fh,
+ .offset = offset,
+ .whence = whence,
+ };
+
+ *fa = (struct bpf_fuse_args) {
+ .nodeid = get_node_id(file->f_inode),
+ .opcode = FUSE_LSEEK,
+ .in_numargs = 1,
+ .in_args[0].size = sizeof(flio->fli),
+ .in_args[0].value = &flio->fli,
+ };
+
+ return 0;
+}
+
+int fuse_lseek_initialize_out(struct bpf_fuse_args *fa, struct fuse_lseek_io *flio,
+ struct file *file, loff_t offset, int whence)
+{
+ fa->out_numargs = 1;
+ fa->out_args[0].size = sizeof(flio->flo);
+ fa->out_args[0].value = &flio->flo;
+
+ return 0;
+}
+
+int fuse_lseek_backing(struct bpf_fuse_args *fa, loff_t *out,
+ struct file *file, loff_t offset, int whence)
+{
+ const struct fuse_lseek_in *fli = fa->in_args[0].value;
+ struct fuse_lseek_out *flo = fa->out_args[0].value;
+ struct fuse_file *fuse_file = file->private_data;
+ struct file *backing_file = fuse_file->backing_file;
+
+ /* TODO: Handle changing of the file handle */
+ if (offset == 0) {
+ if (whence == SEEK_CUR) {
+ flo->offset = file->f_pos;
+ *out = flo->offset;
+ return 0;
+ }
+
+ if (whence == SEEK_SET) {
+ flo->offset = vfs_setpos(file, 0, 0);
+ *out = flo->offset;
+ return 0;
+ }
+ }
+
+ inode_lock(file->f_inode);
+ backing_file->f_pos = file->f_pos;
+ *out = vfs_llseek(backing_file, fli->offset, fli->whence);
+ flo->offset = *out;
+ inode_unlock(file->f_inode);
+ return 0;
+}
+
+int fuse_lseek_finalize(struct bpf_fuse_args *fa, loff_t *out,
+ struct file *file, loff_t offset, int whence)
+{
+ struct fuse_lseek_out *flo = fa->out_args[0].value;
+
+ if (!fa->error_in)
+ file->f_pos = flo->offset;
+ *out = flo->offset;
+ return 0;
+}
+
ssize_t fuse_backing_mmap(struct file *file, struct vm_area_struct *vma)
{
int ret;
diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 138890eae07c..dd4485261cc7 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -2703,6 +2703,14 @@ static loff_t fuse_file_llseek(struct file *file, loff_t offset, int whence)
{
loff_t retval;
struct inode *inode = file_inode(file);
+#ifdef CONFIG_FUSE_BPF
+ if (fuse_bpf_backing(inode, struct fuse_lseek_io, retval,
+ fuse_lseek_initialize_in, fuse_lseek_initialize_out,
+ fuse_lseek_backing,
+ fuse_lseek_finalize,
+ file, offset, whence))
+ return retval;
+#endif
switch (whence) {
case SEEK_SET:
diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
index a9653f71c145..fc3e8adf0422 100644
--- a/fs/fuse/fuse_i.h
+++ b/fs/fuse/fuse_i.h
@@ -1404,9 +1404,22 @@ struct fuse_entry_bpf {
struct bpf_prog *bpf;
};
-
int parse_fuse_entry_bpf(struct fuse_entry_bpf *feb);
+struct fuse_lseek_io {
+ struct fuse_lseek_in fli;
+ struct fuse_lseek_out flo;
+};
+
+int fuse_lseek_initialize_in(struct bpf_fuse_args *fa, struct fuse_lseek_io *fli,
+ struct file *file, loff_t offset, int whence);
+int fuse_lseek_initialize_out(struct bpf_fuse_args *fa, struct fuse_lseek_io *fli,
+ struct file *file, loff_t offset, int whence);
+int fuse_lseek_backing(struct bpf_fuse_args *fa, loff_t *out, struct file *file,
+ loff_t offset, int whence);
+int fuse_lseek_finalize(struct bpf_fuse_args *fa, loff_t *out, struct file *file,
+ loff_t offset, int whence);
+
ssize_t fuse_backing_mmap(struct file *file, struct vm_area_struct *vma);
struct fuse_lookup_io {
--
2.37.3.998.g577e59143f-goog
