diff options
Diffstat (limited to 'hw/9pfs/virtio-9p-local.c')
| -rw-r--r-- | hw/9pfs/virtio-9p-local.c | 126 |
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 = { |