Add a synthetic "/stat/xattr_count" file path that, if being read by 9p client, returns the 9p server internal xattr FID counter to client.
This allows to test and verify that the xattr FID limit is being enforced correctly. Link: https://lore.kernel.org/qemu-devel/357c20fc244c04dcbd36b13aa20a5c9b2034e9f0.1781361555.git.qemu_...@crudebyte.com Signed-off-by: Christian Schoenebeck <[email protected]> --- hw/9pfs/9p-synth.c | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) diff --git a/hw/9pfs/9p-synth.c b/hw/9pfs/9p-synth.c index 4b0732e093..3b3654b282 100644 --- a/hw/9pfs/9p-synth.c +++ b/hw/9pfs/9p-synth.c @@ -565,6 +565,19 @@ static ssize_t v9fs_synth_qtest_flush_write(void *buf, int len, off_t offset, return 1; } +/* transmits internal xattr counter to client */ +static ssize_t v9fs_synth_read_xattr_count(void *buf, int len, off_t offset, + void *arg) +{ + FsContext *ctx = arg; + size_t local_count = ctx->xattr_fid_count; + if (len < (int)sizeof(size_t)) { + return -ENOSPC; + } + memcpy(buf, &local_count, sizeof(size_t)); + return sizeof(size_t); +} + static int synth_init(FsContext *ctx, Error **errp) { QLIST_INIT(&synth_root.child); @@ -626,6 +639,19 @@ static int synth_init(FsContext *ctx, Error **errp) g_free(name); } } + + /* Directory for internal statistic queries */ + { + V9fsSynthNode *stat_dir = NULL; + ret = qemu_v9fs_synth_mkdir(NULL, 0755, "stat", &stat_dir); + assert(!ret); + + /* File for internal xattr count query */ + ret = qemu_v9fs_synth_add_file(stat_dir, 0444, "xattr_count", + v9fs_synth_read_xattr_count, + NULL, ctx); + assert(!ret); + } } return 0; -- 2.47.3
