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[Qemu-devel] [PATCH v4 1/1] 9pfs: local: Add support for custom fmode/dm
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From: |
Tobias Schramm |
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Subject: |
[Qemu-devel] [PATCH v4 1/1] 9pfs: local: Add support for custom fmode/dmode in 9ps mapped security modes |
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Date: |
Mon, 19 Jun 2017 16:28:48 +0200 |
Signed-off-by: Tobias Schramm <address@hidden>
---
v4: Use OPT_NUMBER for file mode arguments, fix back to front naming,
fix resource leak and add sanity checking for fmode/dmode arguments
v3: Use unsigned types for umask
v2: Adjust patch to QEMU code style
fsdev/file-op-9p.h | 4 ++++
fsdev/qemu-fsdev-opts.c | 12 ++++++++++++
hw/9pfs/9p-local.c | 34 +++++++++++++++++++++++++---------
hw/9pfs/9p.c | 3 +++
qemu-options.hx | 20 ++++++++++++++++----
5 files changed, 60 insertions(+), 13 deletions(-)
diff --git a/fsdev/file-op-9p.h b/fsdev/file-op-9p.h
index 0844a403dc..474c79d003 100644
--- a/fsdev/file-op-9p.h
+++ b/fsdev/file-op-9p.h
@@ -76,6 +76,8 @@ typedef struct FsDriverEntry {
int export_flags;
FileOperations *ops;
FsThrottle fst;
+ mode_t fmode;
+ mode_t dmode;
} FsDriverEntry;
typedef struct FsContext
@@ -88,6 +90,8 @@ typedef struct FsContext
FsThrottle *fst;
/* fs driver specific data */
void *private;
+ mode_t fmode;
+ mode_t dmode;
} FsContext;
typedef struct V9fsPath {
diff --git a/fsdev/qemu-fsdev-opts.c b/fsdev/qemu-fsdev-opts.c
index bf5713008a..7c31ffffaf 100644
--- a/fsdev/qemu-fsdev-opts.c
+++ b/fsdev/qemu-fsdev-opts.c
@@ -38,6 +38,12 @@ static QemuOptsList qemu_fsdev_opts = {
}, {
.name = "sock_fd",
.type = QEMU_OPT_NUMBER,
+ }, {
+ .name = "fmode",
+ .type = QEMU_OPT_NUMBER,
+ }, {
+ .name = "dmode",
+ .type = QEMU_OPT_NUMBER,
},
THROTTLE_OPTS,
@@ -75,6 +81,12 @@ static QemuOptsList qemu_virtfs_opts = {
}, {
.name = "sock_fd",
.type = QEMU_OPT_NUMBER,
+ }, {
+ .name = "fmode",
+ .type = QEMU_OPT_NUMBER,
+ }, {
+ .name = "dmode",
+ .type = QEMU_OPT_NUMBER,
},
{ /*End of list */ }
diff --git a/hw/9pfs/9p-local.c b/hw/9pfs/9p-local.c
index 1e78b7c9e9..696e2b75dc 100644
--- a/hw/9pfs/9p-local.c
+++ b/hw/9pfs/9p-local.c
@@ -633,7 +633,7 @@ static int local_mknod(FsContext *fs_ctx, V9fsPath
*dir_path,
if (fs_ctx->export_flags & V9FS_SM_MAPPED ||
fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
- err = mknodat(dirfd, name, SM_LOCAL_MODE_BITS | S_IFREG, 0);
+ err = mknodat(dirfd, name, fs_ctx->fmode | S_IFREG, 0);
if (err == -1) {
goto out;
}
@@ -685,7 +685,7 @@ static int local_mkdir(FsContext *fs_ctx, V9fsPath
*dir_path,
if (fs_ctx->export_flags & V9FS_SM_MAPPED ||
fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
- err = mkdirat(dirfd, name, SM_LOCAL_DIR_MODE_BITS);
+ err = mkdirat(dirfd, name, fs_ctx->dmode);
if (err == -1) {
goto out;
}
@@ -786,7 +786,7 @@ static int local_open2(FsContext *fs_ctx, V9fsPath
*dir_path, const char *name,
/* Determine the security model */
if (fs_ctx->export_flags & V9FS_SM_MAPPED ||
fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
- fd = openat_file(dirfd, name, flags, SM_LOCAL_MODE_BITS);
+ fd = openat_file(dirfd, name, flags, fs_ctx->fmode);
if (fd == -1) {
goto out;
}
@@ -849,7 +849,7 @@ static int local_symlink(FsContext *fs_ctx, const char
*oldpath,
ssize_t oldpath_size, write_size;
fd = openat_file(dirfd, name, O_CREAT | O_EXCL | O_RDWR,
- SM_LOCAL_MODE_BITS);
+ fs_ctx->fmode);
if (fd == -1) {
goto out;
}
@@ -1431,6 +1431,8 @@ static int local_parse_opts(QemuOpts *opts, struct
FsDriverEntry *fse)
{
const char *sec_model = qemu_opt_get(opts, "security_model");
const char *path = qemu_opt_get(opts, "path");
+ uint64_t fmode = qemu_opt_get_number(opts, "fmode", SM_LOCAL_MODE_BITS);
+ uint64_t dmode = qemu_opt_get_number(opts, "dmode",
SM_LOCAL_DIR_MODE_BITS);
Error *err = NULL;
if (!sec_model) {
@@ -1456,17 +1458,31 @@ static int local_parse_opts(QemuOpts *opts, struct
FsDriverEntry *fse)
return -1;
}
- if (!path) {
- error_report("fsdev: No path specified");
- return -1;
- }
-
fsdev_throttle_parse_opts(opts, &fse->fst, &err);
if (err) {
error_reportf_err(err, "Throttle configuration is not valid: ");
return -1;
}
+ if (!(fse->export_flags & (V9FS_SM_MAPPED | V9FS_SM_MAPPED_FILE))) {
+ if (qemu_opt_find(opts, "fmode")) {
+ error_report("fmode is only valid for mapped 9p modes");
+ return -1;
+ }
+ if (qemu_opt_find(opts, "dmode")) {
+ error_report("dmode is only valid for mapped 9p modes");
+ return -1;
+ }
+ }
+
+ fse->fmode = ((mode_t)fmode) & 0777;
+ fse->dmode = ((mode_t)dmode) & 0777;
+
+ if (!path) {
+ error_report("fsdev: No path specified");
+ return -1;
+ }
+
fse->path = g_strdup(path);
return 0;
diff --git a/hw/9pfs/9p.c b/hw/9pfs/9p.c
index 96d2683348..a0ae98f7ca 100644
--- a/hw/9pfs/9p.c
+++ b/hw/9pfs/9p.c
@@ -3533,6 +3533,9 @@ int v9fs_device_realize_common(V9fsState *s, Error **errp)
s->ops = fse->ops;
+ s->ctx.fmode = fse->fmode;
+ s->ctx.dmode = fse->dmode;
+
s->fid_list = NULL;
qemu_co_rwlock_init(&s->rename_lock);
diff --git a/qemu-options.hx b/qemu-options.hx
index 30c4f9850f..5999719720 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -847,7 +847,7 @@ ETEXI
DEF("fsdev", HAS_ARG, QEMU_OPTION_fsdev,
"-fsdev
fsdriver,id=id[,path=path,][security_model={mapped-xattr|mapped-file|passthrough|none}]\n"
- " [,writeout=immediate][,readonly][,socket=socket|sock_fd=sock_fd]\n"
+ "
[,writeout=immediate][,readonly][,socket=socket|sock_fd=sock_fd][,fmode=fmode][,dmode=dmode]\n"
"
[[,throttling.bps-total=b]|[[,throttling.bps-read=r][,throttling.bps-write=w]]]\n"
"
[[,throttling.iops-total=i]|[[,throttling.iops-read=r][,throttling.iops-write=w]]]\n"
"
[[,throttling.bps-total-max=bm]|[[,throttling.bps-read-max=rm][,throttling.bps-write-max=wm]]]\n"
@@ -857,7 +857,7 @@ DEF("fsdev", HAS_ARG, QEMU_OPTION_fsdev,
STEXI
address@hidden -fsdev
@var{fsdriver},address@hidden,address@hidden,address@hidden,address@hidden,readonly][,address@hidden|address@hidden
address@hidden -fsdev
@var{fsdriver},address@hidden,address@hidden,address@hidden,address@hidden,readonly][,address@hidden|address@hidden,address@hidden,address@hidden
@findex -fsdev
Define a new file system device. Valid options are:
@table @option
@@ -898,6 +898,12 @@ with virtfs-proxy-helper
Enables proxy filesystem driver to use passed socket descriptor for
communicating with virtfs-proxy-helper. Usually a helper like libvirt
will create socketpair and pass one of the fds as sock_fd
address@hidden address@hidden
+Specifies the default mode for newly created files on the host. Works only
+with security models "mapped-xattr" and "mapped-file".
address@hidden address@hidden
+Specifies the default mode for newly created directories on the host. Works
+only with security models "mapped-xattr" and "mapped-file".
@end table
-fsdev option is used along with -device driver "virtio-9p-pci".
@@ -914,12 +920,12 @@ ETEXI
DEF("virtfs", HAS_ARG, QEMU_OPTION_virtfs,
"-virtfs
local,path=path,mount_tag=tag,security_model=[mapped-xattr|mapped-file|passthrough|none]\n"
- "
[,id=id][,writeout=immediate][,readonly][,socket=socket|sock_fd=sock_fd]\n",
+ "
[,id=id][,writeout=immediate][,readonly][,socket=socket|sock_fd=sock_fd][,fmode=fmode][,dmode=dmode]\n",
QEMU_ARCH_ALL)
STEXI
address@hidden -virtfs
@var{fsdriver}[,address@hidden,address@hidden,address@hidden,address@hidden,readonly][,address@hidden|address@hidden
address@hidden -virtfs
@var{fsdriver}[,address@hidden,address@hidden,address@hidden,address@hidden,readonly][,address@hidden|address@hidden,address@hidden,address@hidden
@findex -virtfs
The general form of a Virtual File system pass-through options are:
@@ -961,6 +967,12 @@ will create socketpair and pass one of the fds as sock_fd
@item sock_fd
Enables proxy filesystem driver to use passed 'sock_fd' as the socket
descriptor for interfacing with virtfs-proxy-helper
address@hidden address@hidden
+Specifies the default mode for newly created files on the host. Works only
+with security models "mapped-xattr" and "mapped-file".
address@hidden address@hidden
+Specifies the default mode for newly created directories on the host. Works
+only with security models "mapped-xattr" and "mapped-file".
@end table
ETEXI
--
2.13.1