diff options
Diffstat (limited to 'hw/9pfs/virtio-9p-handle.c')
| -rw-r--r-- | hw/9pfs/virtio-9p-handle.c | 120 |
1 files changed, 90 insertions, 30 deletions
diff --git a/hw/9pfs/virtio-9p-handle.c b/hw/9pfs/virtio-9p-handle.c index 5c8b5ed..98809f1 100644 --- a/hw/9pfs/virtio-9p-handle.c +++ b/hw/9pfs/virtio-9p-handle.c @@ -21,49 +21,56 @@ #include <sys/un.h> #include <attr/xattr.h> #include <unistd.h> - -struct handle_data { - int mountfd; - int handle_bytes; -}; - -#if __GLIBC__ <= 2 && __GLIBC_MINOR__ < 14 -struct file_handle { - unsigned int handle_bytes; - int handle_type; - unsigned char handle[0]; -}; +#include <linux/fs.h> +#ifdef CONFIG_LINUX_MAGIC_H +#include <linux/magic.h> #endif +#include <sys/ioctl.h> -#ifndef AT_EMPTY_PATH -#define AT_EMPTY_PATH 0x1000 /* Allow empty relative pathname */ +#ifndef XFS_SUPER_MAGIC +#define XFS_SUPER_MAGIC 0x58465342 #endif -#ifndef O_PATH -#define O_PATH 010000000 +#ifndef EXT2_SUPER_MAGIC +#define EXT2_SUPER_MAGIC 0xEF53 #endif - -#ifndef __NR_name_to_handle_at -#if defined(__i386__) -#define __NR_name_to_handle_at 341 -#define __NR_open_by_handle_at 342 -#elif defined(__x86_64__) -#define __NR_name_to_handle_at 303 -#define __NR_open_by_handle_at 304 +#ifndef REISERFS_SUPER_MAGIC +#define REISERFS_SUPER_MAGIC 0x52654973 #endif +#ifndef BTRFS_SUPER_MAGIC +#define BTRFS_SUPER_MAGIC 0x9123683E #endif -#ifdef __NR_name_to_handle_at +struct handle_data { + int mountfd; + int handle_bytes; +}; + +#ifdef CONFIG_OPEN_BY_HANDLE static inline int name_to_handle(int dirfd, const char *name, struct file_handle *fh, int *mnt_id, int flags) { - return syscall(__NR_name_to_handle_at, dirfd, name, fh, mnt_id, flags); + return name_to_handle_at(dirfd, name, fh, mnt_id, flags); } static inline int open_by_handle(int mountfd, const char *fh, int flags) { - return syscall(__NR_open_by_handle_at, mountfd, fh, flags); + return open_by_handle_at(mountfd, (struct file_handle *)fh, flags); } #else + +struct file_handle { + unsigned int handle_bytes; + int handle_type; + unsigned char handle[0]; +}; + +#ifndef AT_EMPTY_PATH +#define AT_EMPTY_PATH 0x1000 /* Allow empty relative pathname */ +#endif +#ifndef O_PATH +#define O_PATH 010000000 +#endif + static inline int name_to_handle(int dirfd, const char *name, struct file_handle *fh, int *mnt_id, int flags) { @@ -192,16 +199,29 @@ static ssize_t handle_preadv(FsContext *ctx, int fd, const struct iovec *iov, static ssize_t handle_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 handle_chmod(FsContext *fs_ctx, V9fsPath *fs_path, FsCred *credp) @@ -367,7 +387,9 @@ static int handle_chown(FsContext *fs_ctx, V9fsPath *fs_path, FsCred *credp) static int handle_utimensat(FsContext *ctx, V9fsPath *fs_path, const struct timespec *buf) { - int fd, ret; + int ret; +#ifdef CONFIG_UTIMENSAT + int fd; struct handle_data *data = (struct handle_data *)ctx->private; fd = open_by_handle(data->mountfd, fs_path->data, O_NONBLOCK); @@ -376,6 +398,10 @@ static int handle_utimensat(FsContext *ctx, V9fsPath *fs_path, } ret = futimens(fd, buf); close(fd); +#else + ret = -1; + errno = ENOSYS; +#endif return ret; } @@ -546,16 +572,50 @@ static int handle_unlinkat(FsContext *ctx, V9fsPath *dir, return ret; } +static int handle_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 = handle_open(ctx, path, O_RDONLY); + if (fd < 0) { + return fd; + } + err = ioctl(fd, FS_IOC_GETVERSION, st_gen); + handle_close(ctx, fd); + return err; +} + static int handle_init(FsContext *ctx) { int ret, mnt_id; + struct statfs stbuf; struct file_handle fh; struct handle_data *data = g_malloc(sizeof(struct handle_data)); + data->mountfd = open(ctx->fs_root, O_DIRECTORY); if (data->mountfd < 0) { ret = data->mountfd; goto err_out; } + ret = statfs(ctx->fs_root, &stbuf); + if (!ret) { + 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 = handle_ioc_getversion; + break; + } + } memset(&fh, 0, sizeof(struct file_handle)); ret = name_to_handle(data->mountfd, ".", &fh, &mnt_id, 0); if (ret && errno == EOVERFLOW) { |