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bcachefs: bch2_dir_emit() - fix directory reads in the fuse driver

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Commit 0c0cbfdb84 dropped the ctx->pos
update before the call to dir_emit. This breaks the userspace
implementation, causing the directory reads to be stuck in an infinite
loop. This doesn't happen in the kernel because the vfs handles the
updates to ctx->pos, but in the fuse implementation nobody updates
it.

Signed-off-by: Ariel Miculas <ariel.miculas@gmail.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Ariel Miculas 2024-05-31 00:13:58 +03:00 committed by Kent Overstreet
parent 7ed122aea2
commit f8b0147364
1 changed files with 8 additions and 0 deletions
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8
fs/bcachefs/dirent.c
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@ -534,6 +534,14 @@ int bch2_empty_dir_trans(struct btree_trans *trans, subvol_inum dir)
static int bch2_dir_emit(struct dir_context *ctx, struct bkey_s_c_dirent d, subvol_inum target)
{
struct qstr name = bch2_dirent_get_name(d);
/*
* Although not required by the kernel code, updating ctx->pos is needed
* for the bcachefs FUSE driver. Without this update, the FUSE
* implementation will be stuck in an infinite loop when reading
* directories (via the bcachefs_fuse_readdir callback).
* In kernel space, ctx->pos is updated by the VFS code.
*/
ctx->pos = d.k->p.offset;
bool ret = dir_emit(ctx, name.name,
name.len,
target.inum,