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path: root/hw/9pfs/virtio-9p-local.c
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Diffstat (limited to 'hw/9pfs/virtio-9p-local.c')
-rw-r--r--hw/9pfs/virtio-9p-local.c126
1 files changed, 96 insertions, 30 deletions
diff --git a/hw/9pfs/virtio-9p-local.c b/hw/9pfs/virtio-9p-local.c
index 9559ff6550..d561de88f0 100644
--- a/hw/9pfs/virtio-9p-local.c
+++ b/hw/9pfs/virtio-9p-local.c
@@ -20,6 +20,24 @@
#include <sys/socket.h>
#include <sys/un.h>
#include <attr/xattr.h>
+#include <linux/fs.h>
+#ifdef CONFIG_LINUX_MAGIC_H
+#include <linux/magic.h>
+#endif
+#include <sys/ioctl.h>
+
+#ifndef XFS_SUPER_MAGIC
+#define XFS_SUPER_MAGIC 0x58465342
+#endif
+#ifndef EXT2_SUPER_MAGIC
+#define EXT2_SUPER_MAGIC 0xEF53
+#endif
+#ifndef REISERFS_SUPER_MAGIC
+#define REISERFS_SUPER_MAGIC 0x52654973
+#endif
+#ifndef BTRFS_SUPER_MAGIC
+#define BTRFS_SUPER_MAGIC 0x9123683E
+#endif
static int local_lstat(FsContext *fs_ctx, V9fsPath *fs_path, struct stat *stbuf)
{
@@ -31,7 +49,7 @@ static int local_lstat(FsContext *fs_ctx, V9fsPath *fs_path, struct stat *stbuf)
if (err) {
return err;
}
- if (fs_ctx->fs_sm == SM_MAPPED) {
+ if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
/* Actual credentials are part of extended attrs */
uid_t tmp_uid;
gid_t tmp_gid;
@@ -106,7 +124,7 @@ static int local_post_create_passthrough(FsContext *fs_ctx, const char *path,
* If we fail to change ownership and if we are
* using security model none. Ignore the error
*/
- if (fs_ctx->fs_sm != SM_NONE) {
+ if ((fs_ctx->export_flags & V9FS_SEC_MASK) != V9FS_SM_NONE) {
return -1;
}
}
@@ -120,7 +138,7 @@ static ssize_t local_readlink(FsContext *fs_ctx, V9fsPath *fs_path,
char buffer[PATH_MAX];
char *path = fs_path->data;
- if (fs_ctx->fs_sm == SM_MAPPED) {
+ if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
int fd;
fd = open(rpath(fs_ctx, path, buffer), O_RDONLY);
if (fd == -1) {
@@ -131,8 +149,8 @@ static ssize_t local_readlink(FsContext *fs_ctx, V9fsPath *fs_path,
} while (tsize == -1 && errno == EINTR);
close(fd);
return tsize;
- } else if ((fs_ctx->fs_sm == SM_PASSTHROUGH) ||
- (fs_ctx->fs_sm == SM_NONE)) {
+ } else if ((fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) ||
+ (fs_ctx->export_flags & V9FS_SM_NONE)) {
tsize = readlink(rpath(fs_ctx, path, buffer), buf, bufsz);
}
return tsize;
@@ -203,16 +221,30 @@ static ssize_t local_preadv(FsContext *ctx, int fd, const struct iovec *iov,
static ssize_t local_pwritev(FsContext *ctx, int fd, const struct iovec *iov,
int iovcnt, off_t offset)
{
+ ssize_t ret
+;
#ifdef CONFIG_PREADV
- return pwritev(fd, iov, iovcnt, offset);
+ ret = pwritev(fd, iov, iovcnt, offset);
#else
int err = lseek(fd, offset, SEEK_SET);
if (err == -1) {
return err;
} else {
- return writev(fd, iov, iovcnt);
+ ret = writev(fd, iov, iovcnt);
}
#endif
+#ifdef CONFIG_SYNC_FILE_RANGE
+ if (ret > 0 && ctx->export_flags & V9FS_IMMEDIATE_WRITEOUT) {
+ /*
+ * Initiate a writeback. This is not a data integrity sync.
+ * We want to ensure that we don't leave dirty pages in the cache
+ * after write when writeout=immediate is sepcified.
+ */
+ sync_file_range(fd, offset, ret,
+ SYNC_FILE_RANGE_WAIT_BEFORE | SYNC_FILE_RANGE_WRITE);
+ }
+#endif
+ return ret;
}
static int local_chmod(FsContext *fs_ctx, V9fsPath *fs_path, FsCred *credp)
@@ -220,10 +252,10 @@ static int local_chmod(FsContext *fs_ctx, V9fsPath *fs_path, FsCred *credp)
char buffer[PATH_MAX];
char *path = fs_path->data;
- if (fs_ctx->fs_sm == SM_MAPPED) {
+ if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
return local_set_xattr(rpath(fs_ctx, path, buffer), credp);
- } else if ((fs_ctx->fs_sm == SM_PASSTHROUGH) ||
- (fs_ctx->fs_sm == SM_NONE)) {
+ } else if ((fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) ||
+ (fs_ctx->export_flags & V9FS_SM_NONE)) {
return chmod(rpath(fs_ctx, path, buffer), credp->fc_mode);
}
return -1;
@@ -243,7 +275,7 @@ static int local_mknod(FsContext *fs_ctx, V9fsPath *dir_path,
path = fullname.data;
/* Determine the security model */
- if (fs_ctx->fs_sm == SM_MAPPED) {
+ if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
err = mknod(rpath(fs_ctx, path, buffer),
SM_LOCAL_MODE_BITS|S_IFREG, 0);
if (err == -1) {
@@ -254,8 +286,8 @@ static int local_mknod(FsContext *fs_ctx, V9fsPath *dir_path,
serrno = errno;
goto err_end;
}
- } else if ((fs_ctx->fs_sm == SM_PASSTHROUGH) ||
- (fs_ctx->fs_sm == SM_NONE)) {
+ } else if ((fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) ||
+ (fs_ctx->export_flags & V9FS_SM_NONE)) {
err = mknod(rpath(fs_ctx, path, buffer), credp->fc_mode,
credp->fc_rdev);
if (err == -1) {
@@ -291,7 +323,7 @@ static int local_mkdir(FsContext *fs_ctx, V9fsPath *dir_path,
path = fullname.data;
/* Determine the security model */
- if (fs_ctx->fs_sm == SM_MAPPED) {
+ if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
err = mkdir(rpath(fs_ctx, path, buffer), SM_LOCAL_DIR_MODE_BITS);
if (err == -1) {
goto out;
@@ -302,8 +334,8 @@ static int local_mkdir(FsContext *fs_ctx, V9fsPath *dir_path,
serrno = errno;
goto err_end;
}
- } else if ((fs_ctx->fs_sm == SM_PASSTHROUGH) ||
- (fs_ctx->fs_sm == SM_NONE)) {
+ } else if ((fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) ||
+ (fs_ctx->export_flags & V9FS_SM_NONE)) {
err = mkdir(rpath(fs_ctx, path, buffer), credp->fc_mode);
if (err == -1) {
goto out;
@@ -331,7 +363,7 @@ static int local_fstat(FsContext *fs_ctx, int fd, struct stat *stbuf)
if (err) {
return err;
}
- if (fs_ctx->fs_sm == SM_MAPPED) {
+ if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
/* Actual credentials are part of extended attrs */
uid_t tmp_uid;
gid_t tmp_gid;
@@ -369,7 +401,7 @@ static int local_open2(FsContext *fs_ctx, V9fsPath *dir_path, const char *name,
path = fullname.data;
/* Determine the security model */
- if (fs_ctx->fs_sm == SM_MAPPED) {
+ if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
fd = open(rpath(fs_ctx, path, buffer), flags, SM_LOCAL_MODE_BITS);
if (fd == -1) {
err = fd;
@@ -382,8 +414,8 @@ static int local_open2(FsContext *fs_ctx, V9fsPath *dir_path, const char *name,
serrno = errno;
goto err_end;
}
- } else if ((fs_ctx->fs_sm == SM_PASSTHROUGH) ||
- (fs_ctx->fs_sm == SM_NONE)) {
+ } else if ((fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) ||
+ (fs_ctx->export_flags & V9FS_SM_NONE)) {
fd = open(rpath(fs_ctx, path, buffer), flags, credp->fc_mode);
if (fd == -1) {
err = fd;
@@ -422,7 +454,7 @@ static int local_symlink(FsContext *fs_ctx, const char *oldpath,
newpath = fullname.data;
/* Determine the security model */
- if (fs_ctx->fs_sm == SM_MAPPED) {
+ if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
int fd;
ssize_t oldpath_size, write_size;
fd = open(rpath(fs_ctx, newpath, buffer), O_CREAT|O_EXCL|O_RDWR,
@@ -451,8 +483,8 @@ static int local_symlink(FsContext *fs_ctx, const char *oldpath,
serrno = errno;
goto err_end;
}
- } else if ((fs_ctx->fs_sm == SM_PASSTHROUGH) ||
- (fs_ctx->fs_sm == SM_NONE)) {
+ } else if ((fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) ||
+ (fs_ctx->export_flags & V9FS_SM_NONE)) {
err = symlink(oldpath, rpath(fs_ctx, newpath, buffer));
if (err) {
goto out;
@@ -464,7 +496,7 @@ static int local_symlink(FsContext *fs_ctx, const char *oldpath,
* If we fail to change ownership and if we are
* using security model none. Ignore the error
*/
- if (fs_ctx->fs_sm != SM_NONE) {
+ if ((fs_ctx->export_flags & V9FS_SEC_MASK) != V9FS_SM_NONE) {
serrno = errno;
goto err_end;
} else
@@ -519,13 +551,13 @@ static int local_chown(FsContext *fs_ctx, V9fsPath *fs_path, FsCred *credp)
char *path = fs_path->data;
if ((credp->fc_uid == -1 && credp->fc_gid == -1) ||
- (fs_ctx->fs_sm == SM_PASSTHROUGH)) {
+ (fs_ctx->export_flags & V9FS_SM_PASSTHROUGH)) {
return lchown(rpath(fs_ctx, path, buffer), credp->fc_uid,
credp->fc_gid);
- } else if (fs_ctx->fs_sm == SM_MAPPED) {
+ } else if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
return local_set_xattr(rpath(fs_ctx, path, buffer), credp);
- } else if ((fs_ctx->fs_sm == SM_PASSTHROUGH) ||
- (fs_ctx->fs_sm == SM_NONE)) {
+ } else if ((fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) ||
+ (fs_ctx->export_flags & V9FS_SM_NONE)) {
return lchown(rpath(fs_ctx, path, buffer), credp->fc_uid,
credp->fc_gid);
}
@@ -645,10 +677,44 @@ static int local_unlinkat(FsContext *ctx, V9fsPath *dir,
return ret;
}
+static int local_ioc_getversion(FsContext *ctx, V9fsPath *path,
+ mode_t st_mode, uint64_t *st_gen)
+{
+ int err, fd;
+ /*
+ * Do not try to open special files like device nodes, fifos etc
+ * We can get fd for regular files and directories only
+ */
+ if (!S_ISREG(st_mode) && !S_ISDIR(st_mode)) {
+ return 0;
+ }
+ fd = local_open(ctx, path, O_RDONLY);
+ if (fd < 0) {
+ return fd;
+ }
+ err = ioctl(fd, FS_IOC_GETVERSION, st_gen);
+ local_close(ctx, fd);
+ return err;
+}
+
static int local_init(FsContext *ctx)
{
- ctx->flags |= PATHNAME_FSCONTEXT;
- return 0;
+ int err;
+ struct statfs stbuf;
+
+ ctx->export_flags |= V9FS_PATHNAME_FSCONTEXT;
+ err = statfs(ctx->fs_root, &stbuf);
+ if (!err) {
+ switch (stbuf.f_type) {
+ case EXT2_SUPER_MAGIC:
+ case BTRFS_SUPER_MAGIC:
+ case REISERFS_SUPER_MAGIC:
+ case XFS_SUPER_MAGIC:
+ ctx->exops.get_st_gen = local_ioc_getversion;
+ break;
+ }
+ }
+ return err;
}
FileOperations local_ops = {
generated by cgit v1.2.3 (git 2.26.2) at 2025-01-02 15:24:25 +0000