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[PULL 04/19] 9p: darwin: Handle struct dirent differences
From: |
Christian Schoenebeck |
Subject: |
[PULL 04/19] 9p: darwin: Handle struct dirent differences |
Date: |
Fri, 04 Mar 2022 13:27:49 +0100 |
From: Keno Fischer <keno@juliacomputing.com>
On darwin d_seekoff exists, but is optional and does not seem to
be commonly used by file systems. Use `telldir` instead to obtain
the seek offset and inject it into d_seekoff, and create a
qemu_dirent_off helper to call it appropriately when appropriate.
Signed-off-by: Keno Fischer <keno@juliacomputing.com>
[Michael Roitzsch: - Rebase for NixOS]
Signed-off-by: Michael Roitzsch <reactorcontrol@icloud.com>
[Will Cohen: - Adjust to pass testing
- Ensure that d_seekoff is filled using telldir
on darwin, and create qemu_dirent_off helper
to decide which to access]
[Fabian Franz: - Add telldir error handling for darwin]
Signed-off-by: Fabian Franz <fabianfranz.oss@gmail.com>
[Will Cohen: - Ensure that telldir error handling uses
signed int
- Cleanup of telldir error handling
- Remove superfluous error handling for
qemu_dirent_off
- Adjust formatting
- Use qemu_dirent_off in codir.c
- Declare qemu_dirent_off as static to prevent
linker error
- Move qemu_dirent_off above the end-of-file
endif to fix compilation]
Signed-off-by: Will Cohen <wwcohen@gmail.com>
Message-Id: <20220227223522.91937-5-wwcohen@gmail.com>
Signed-off-by: Christian Schoenebeck <qemu_oss@crudebyte.com>
Reviewed-by: Christian Schoenebeck <qemu_oss@crudebyte.com>
---
hw/9pfs/9p-local.c | 9 +++++++++
hw/9pfs/9p-proxy.c | 16 +++++++++++++++-
hw/9pfs/9p-synth.c | 4 ++++
hw/9pfs/9p-util.h | 16 ++++++++++++++++
hw/9pfs/9p.c | 7 +++++--
hw/9pfs/codir.c | 4 +++-
6 files changed, 52 insertions(+), 4 deletions(-)
diff --git a/hw/9pfs/9p-local.c b/hw/9pfs/9p-local.c
index 1a5e3eed73..f3272f0b43 100644
--- a/hw/9pfs/9p-local.c
+++ b/hw/9pfs/9p-local.c
@@ -562,6 +562,15 @@ again:
if (!entry) {
return NULL;
}
+#ifdef CONFIG_DARWIN
+ int off;
+ off = telldir(fs->dir.stream);
+ /* If telldir fails, fail the entire readdir call */
+ if (off < 0) {
+ return NULL;
+ }
+ entry->d_seekoff = off;
+#endif
if (ctx->export_flags & V9FS_SM_MAPPED) {
entry->d_type = DT_UNKNOWN;
diff --git a/hw/9pfs/9p-proxy.c b/hw/9pfs/9p-proxy.c
index b1664080d8..8b4b5cf7dc 100644
--- a/hw/9pfs/9p-proxy.c
+++ b/hw/9pfs/9p-proxy.c
@@ -706,7 +706,21 @@ static off_t proxy_telldir(FsContext *ctx,
V9fsFidOpenState *fs)
static struct dirent *proxy_readdir(FsContext *ctx, V9fsFidOpenState *fs)
{
- return readdir(fs->dir.stream);
+ struct dirent *entry;
+ entry = readdir(fs->dir.stream);
+#ifdef CONFIG_DARWIN
+ if (!entry) {
+ return NULL;
+ }
+ int td;
+ td = telldir(fs->dir.stream);
+ /* If telldir fails, fail the entire readdir call */
+ if (td < 0) {
+ return NULL;
+ }
+ entry->d_seekoff = td;
+#endif
+ return entry;
}
static void proxy_seekdir(FsContext *ctx, V9fsFidOpenState *fs, off_t off)
diff --git a/hw/9pfs/9p-synth.c b/hw/9pfs/9p-synth.c
index bf9b0c5ddd..b3080e415b 100644
--- a/hw/9pfs/9p-synth.c
+++ b/hw/9pfs/9p-synth.c
@@ -234,7 +234,11 @@ static void synth_direntry(V9fsSynthNode *node,
offsetof(struct dirent, d_name) + sz);
memcpy(entry->d_name, node->name, sz);
entry->d_ino = node->attr->inode;
+#ifdef CONFIG_DARWIN
+ entry->d_seekoff = off + 1;
+#else
entry->d_off = off + 1;
+#endif
}
static struct dirent *synth_get_dentry(V9fsSynthNode *dir,
diff --git a/hw/9pfs/9p-util.h b/hw/9pfs/9p-util.h
index 546f46dc7d..7449733c15 100644
--- a/hw/9pfs/9p-util.h
+++ b/hw/9pfs/9p-util.h
@@ -78,4 +78,20 @@ ssize_t flistxattrat_nofollow(int dirfd, const char
*filename,
ssize_t fremovexattrat_nofollow(int dirfd, const char *filename,
const char *name);
+/**
+ * Darwin has d_seekoff, which appears to function similarly to d_off.
+ * However, it does not appear to be supported on all file systems,
+ * so ensure it is manually injected earlier and call here when
+ * needed.
+ */
+static inline off_t qemu_dirent_off(struct dirent *dent)
+{
+#ifdef CONFIG_DARWIN
+ return dent->d_seekoff;
+#else
+ return dent->d_off;
+#endif
+}
+
+
#endif
diff --git a/hw/9pfs/9p.c b/hw/9pfs/9p.c
index 1563d7b7c6..caf3b240fe 100644
--- a/hw/9pfs/9p.c
+++ b/hw/9pfs/9p.c
@@ -27,6 +27,7 @@
#include "virtio-9p.h"
#include "fsdev/qemu-fsdev.h"
#include "9p-xattr.h"
+#include "9p-util.h"
#include "coth.h"
#include "trace.h"
#include "migration/blocker.h"
@@ -2281,7 +2282,7 @@ static int coroutine_fn v9fs_do_readdir_with_stat(V9fsPDU
*pdu,
count += len;
v9fs_stat_free(&v9stat);
v9fs_path_free(&path);
- saved_dir_pos = dent->d_off;
+ saved_dir_pos = qemu_dirent_off(dent);
}
v9fs_readdir_unlock(&fidp->fs.dir);
@@ -2420,6 +2421,7 @@ static int coroutine_fn v9fs_do_readdir(V9fsPDU *pdu,
V9fsFidState *fidp,
V9fsString name;
int len, err = 0;
int32_t count = 0;
+ off_t off;
struct dirent *dent;
struct stat *st;
struct V9fsDirEnt *entries = NULL;
@@ -2480,12 +2482,13 @@ static int coroutine_fn v9fs_do_readdir(V9fsPDU *pdu,
V9fsFidState *fidp,
qid.version = 0;
}
+ off = qemu_dirent_off(dent);
v9fs_string_init(&name);
v9fs_string_sprintf(&name, "%s", dent->d_name);
/* 11 = 7 + 4 (7 = start offset, 4 = space for storing count) */
len = pdu_marshal(pdu, 11 + count, "Qqbs",
- &qid, dent->d_off,
+ &qid, off,
dent->d_type, &name);
v9fs_string_free(&name);
diff --git a/hw/9pfs/codir.c b/hw/9pfs/codir.c
index c0873bde16..f96d8ac4e6 100644
--- a/hw/9pfs/codir.c
+++ b/hw/9pfs/codir.c
@@ -22,6 +22,8 @@
#include "qemu/coroutine.h"
#include "qemu/main-loop.h"
#include "coth.h"
+#include "9p-xattr.h"
+#include "9p-util.h"
/*
* Intended to be called from bottom-half (e.g. background I/O thread)
@@ -166,7 +168,7 @@ static int do_readdir_many(V9fsPDU *pdu, V9fsFidState *fidp,
}
size += len;
- saved_dir_pos = dent->d_off;
+ saved_dir_pos = qemu_dirent_off(dent);
}
/* restore (last) saved position */
--
2.20.1
- [PULL 00/19] 9p queue 2022-03-04, Christian Schoenebeck, 2022/03/04
- [PULL 13/19] 9pfs: drop Doxygen format from qemu_dirent_dup() API comment, Christian Schoenebeck, 2022/03/04
- [PULL 07/19] 9p: darwin: *xattr_nofollow implementations, Christian Schoenebeck, 2022/03/04
- [PULL 15/19] 9pfs/codir.c: convert Doxygen -> kerneldoc format, Christian Schoenebeck, 2022/03/04
- [PULL 19/19] fsdev/p9array.h: convert Doxygen -> kerneldoc format, Christian Schoenebeck, 2022/03/04
- [PULL 01/19] 9p: linux: Fix a couple Linux assumptions, Christian Schoenebeck, 2022/03/04
- [PULL 17/19] 9pfs/9p-util.h: convert Doxygen -> kerneldoc format, Christian Schoenebeck, 2022/03/04
- [PULL 16/19] 9pfs/9p.c: convert Doxygen -> kerneldoc format, Christian Schoenebeck, 2022/03/04
- [PULL 11/19] 9p: darwin: meson: Allow VirtFS on Darwin, Christian Schoenebeck, 2022/03/04
- [PULL 04/19] 9p: darwin: Handle struct dirent differences,
Christian Schoenebeck <=
- [PULL 08/19] 9p: darwin: Compatibility for f/l*xattr, Christian Schoenebeck, 2022/03/04
- [PULL 02/19] 9p: Rename 9p-util -> 9p-util-linux, Christian Schoenebeck, 2022/03/04
- [PULL 09/19] 9p: darwin: Implement compatibility for mknodat, Christian Schoenebeck, 2022/03/04
- [PULL 18/19] 9pfs/coth.h: drop Doxygen format on v9fs_co_run_in_worker(), Christian Schoenebeck, 2022/03/04
- [PULL 05/19] 9p: darwin: Ignore O_{NOATIME, DIRECT}, Christian Schoenebeck, 2022/03/04
- [PULL 10/19] 9p: darwin: Adjust assumption on virtio-9p-test, Christian Schoenebeck, 2022/03/04
- [PULL 06/19] 9p: darwin: Move XATTR_SIZE_MAX->P9_XATTR_SIZE_MAX, Christian Schoenebeck, 2022/03/04
- [PULL 14/19] 9pfs/9p.h: convert Doxygen -> kerneldoc format, Christian Schoenebeck, 2022/03/04
- [PULL 03/19] 9p: darwin: Handle struct stat(fs) differences, Christian Schoenebeck, 2022/03/04
- [PULL 12/19] 9pfs: move qemu_dirent_dup() from osdep -> 9p-util, Christian Schoenebeck, 2022/03/04