390 i386 fsconfig sys_fsconfig __ia32_sys_fsconfig
391 i386 fsmount sys_fsmount __ia32_sys_fsmount
392 i386 fspick sys_fspick __ia32_sys_fspick
+393 i386 fsinfo sys_fsinfo __ia32_sys_fsinfo
338 common fsconfig __x64_sys_fsconfig
339 common fsmount __x64_sys_fsmount
340 common fspick __x64_sys_fspick
+341 common fsinfo __x64_sys_fsinfo
#
# x32-specific system call numbers start at 512 to avoid cache impact
#include <linux/security.h>
#include <linux/uaccess.h>
#include <linux/compat.h>
+#include <linux/fsinfo.h>
#include "internal.h"
static int flags_by_mnt(int mnt_flags)
return 0;
}
#endif
+
+/*
+ * Get basic filesystem stats from statfs.
+ */
+static int fsinfo_generic_statfs(struct dentry *dentry,
+ struct fsinfo_statfs *p)
+{
+ struct kstatfs buf;
+ int ret;
+
+ ret = statfs_by_dentry(dentry, &buf);
+ if (ret < 0)
+ return ret;
+
+ p->f_blocks = buf.f_blocks;
+ p->f_bfree = buf.f_bfree;
+ p->f_bavail = buf.f_bavail;
+ p->f_files = buf.f_files;
+ p->f_ffree = buf.f_ffree;
+ p->f_favail = buf.f_ffree;
+ p->f_bsize = buf.f_bsize;
+ p->f_frsize = buf.f_frsize;
+ return sizeof(*p);
+}
+
+static int fsinfo_generic_ids(struct dentry *dentry,
+ struct fsinfo_ids *p)
+{
+ struct super_block *sb;
+ struct kstatfs buf;
+ int ret;
+
+ ret = statfs_by_dentry(dentry, &buf);
+ if (ret < 0)
+ return ret;
+
+ sb = dentry->d_sb;
+ p->f_fstype = sb->s_magic;
+ p->f_dev_major = MAJOR(sb->s_dev);
+ p->f_dev_minor = MINOR(sb->s_dev);
+ p->f_flags = ST_VALID | flags_by_sb(sb->s_flags);
+
+ memcpy(&p->f_fsid, &buf.f_fsid, sizeof(p->f_fsid));
+ strlcpy(p->f_fs_name, dentry->d_sb->s_type->name, sizeof(p->f_fs_name));
+ return sizeof(*p);
+}
+
+static int fsinfo_generic_limits(struct dentry *dentry,
+ struct fsinfo_limits *lim)
+{
+ struct super_block *sb = dentry->d_sb;
+
+ lim->max_file_size = sb->s_maxbytes;
+ lim->max_hard_links = sb->s_max_links;
+ lim->max_uid = UINT_MAX;
+ lim->max_gid = UINT_MAX;
+ lim->max_projid = UINT_MAX;
+ lim->max_filename_len = NAME_MAX;
+ lim->max_symlink_len = PAGE_SIZE;
+ lim->max_xattr_name_len = XATTR_NAME_MAX;
+ lim->max_xattr_body_len = XATTR_SIZE_MAX;
+ lim->max_dev_major = 0xffffff;
+ lim->max_dev_minor = 0xff;
+ return sizeof(*lim);
+}
+
+static int fsinfo_generic_supports(struct dentry *dentry,
+ struct fsinfo_supports *c)
+{
+ struct super_block *sb = dentry->d_sb;
+
+ c->stx_mask = STATX_BASIC_STATS;
+ if (sb->s_d_op && sb->s_d_op->d_automount)
+ c->stx_attributes |= STATX_ATTR_AUTOMOUNT;
+ return sizeof(*c);
+}
+
+static int fsinfo_generic_capabilities(struct dentry *dentry,
+ struct fsinfo_capabilities *c)
+{
+ struct super_block *sb = dentry->d_sb;
+
+ if (sb->s_mtd)
+ fsinfo_set_cap(c, FSINFO_CAP_IS_FLASH_FS);
+ else if (sb->s_bdev)
+ fsinfo_set_cap(c, FSINFO_CAP_IS_BLOCK_FS);
+
+ if (sb->s_quota_types & QTYPE_MASK_USR)
+ fsinfo_set_cap(c, FSINFO_CAP_USER_QUOTAS);
+ if (sb->s_quota_types & QTYPE_MASK_GRP)
+ fsinfo_set_cap(c, FSINFO_CAP_GROUP_QUOTAS);
+ if (sb->s_quota_types & QTYPE_MASK_PRJ)
+ fsinfo_set_cap(c, FSINFO_CAP_PROJECT_QUOTAS);
+ if (sb->s_d_op && sb->s_d_op->d_automount)
+ fsinfo_set_cap(c, FSINFO_CAP_AUTOMOUNTS);
+ if (sb->s_id[0])
+ fsinfo_set_cap(c, FSINFO_CAP_VOLUME_ID);
+
+ fsinfo_set_cap(c, FSINFO_CAP_HAS_ATIME);
+ fsinfo_set_cap(c, FSINFO_CAP_HAS_CTIME);
+ fsinfo_set_cap(c, FSINFO_CAP_HAS_MTIME);
+ return sizeof(*c);
+}
+
+static int fsinfo_generic_timestamp_info(struct dentry *dentry,
+ struct fsinfo_timestamp_info *ts)
+{
+ struct super_block *sb = dentry->d_sb;
+
+ /* If unset, assume 1s granularity */
+ u16 mantissa = 1;
+ s8 exponent = 0;
+
+ ts->minimum_timestamp = S64_MIN;
+ ts->maximum_timestamp = S64_MAX;
+ if (sb->s_time_gran < 1000000000) {
+ if (sb->s_time_gran < 1000)
+ exponent = -9;
+ else if (sb->s_time_gran < 1000000)
+ exponent = -6;
+ else
+ exponent = -3;
+ }
+#define set_gran(x) \
+ do { \
+ ts->x##_mantissa = mantissa; \
+ ts->x##_exponent = exponent; \
+ } while (0)
+ set_gran(atime_gran);
+ set_gran(btime_gran);
+ set_gran(ctime_gran);
+ set_gran(mtime_gran);
+ return sizeof(*ts);
+}
+
+static int fsinfo_generic_volume_uuid(struct dentry *dentry,
+ struct fsinfo_volume_uuid *vu)
+{
+ struct super_block *sb = dentry->d_sb;
+
+ memcpy(vu, &sb->s_uuid, sizeof(*vu));
+ return sizeof(*vu);
+}
+
+static int fsinfo_generic_volume_id(struct dentry *dentry, char *buf)
+{
+ struct super_block *sb = dentry->d_sb;
+ size_t len = strlen(sb->s_id);
+
+ memcpy(buf, sb->s_id, len + 1);
+ return len;
+}
+
+static int fsinfo_generic_name_encoding(struct dentry *dentry, char *buf)
+{
+ static const char encoding[] = "utf8";
+
+ memcpy(buf, encoding, sizeof(encoding) - 1);
+ return sizeof(encoding) - 1;
+}
+
+static int fsinfo_generic_io_size(struct dentry *dentry,
+ struct fsinfo_io_size *c)
+{
+ struct super_block *sb = dentry->d_sb;
+ struct kstatfs buf;
+ int ret;
+
+ if (sb->s_op->statfs == simple_statfs) {
+ c->dio_size_gran = 1;
+ c->dio_mem_align = 1;
+ } else {
+ ret = statfs_by_dentry(dentry, &buf);
+ if (ret < 0)
+ return ret;
+ c->dio_size_gran = buf.f_bsize;
+ c->dio_mem_align = buf.f_bsize;
+ }
+ return sizeof(*c);
+}
+
+/*
+ * Implement some queries generically from stuff in the superblock.
+ */
+int generic_fsinfo(struct path *path, struct fsinfo_kparams *params)
+{
+ struct dentry *dentry = path->dentry;
+
+#define _gen(X, Y) FSINFO_ATTR_##X: return fsinfo_generic_##Y(dentry, params->buffer)
+
+ switch (params->request) {
+ case _gen(STATFS, statfs);
+ case _gen(IDS, ids);
+ case _gen(LIMITS, limits);
+ case _gen(SUPPORTS, supports);
+ case _gen(CAPABILITIES, capabilities);
+ case _gen(TIMESTAMP_INFO, timestamp_info);
+ case _gen(VOLUME_UUID, volume_uuid);
+ case _gen(VOLUME_ID, volume_id);
+ case _gen(NAME_ENCODING, name_encoding);
+ case _gen(IO_SIZE, io_size);
+ default:
+ return -EOPNOTSUPP;
+ }
+}
+EXPORT_SYMBOL(generic_fsinfo);
+
+/*
+ * Retrieve the filesystem info. We make some stuff up if the operation is not
+ * supported.
+ */
+int vfs_fsinfo(struct path *path, struct fsinfo_kparams *params)
+{
+ struct dentry *dentry = path->dentry;
+ int (*fsinfo)(struct path *, struct fsinfo_kparams *);
+ int ret;
+
+ if (params->request == FSINFO_ATTR_FSINFO) {
+ struct fsinfo_fsinfo *info = params->buffer;
+
+ info->max_attr = FSINFO_ATTR__NR;
+ info->max_cap = FSINFO_CAP__NR;
+ return sizeof(*info);
+ }
+
+ fsinfo = dentry->d_sb->s_op->fsinfo;
+ if (!fsinfo) {
+ if (!dentry->d_sb->s_op->statfs)
+ return -EOPNOTSUPP;
+ fsinfo = generic_fsinfo;
+ }
+
+ ret = security_sb_statfs(dentry);
+ if (ret)
+ return ret;
+
+ ret = fsinfo(path, params);
+ if (ret < 0)
+ return ret;
+
+ if (params->request == FSINFO_ATTR_IDS &&
+ params->buffer) {
+ struct fsinfo_ids *p = params->buffer;
+
+ p->f_flags |= flags_by_mnt(path->mnt->mnt_flags);
+ }
+ return ret;
+}
+
+static int vfs_fsinfo_path(int dfd, const char __user *filename,
+ struct fsinfo_kparams *params)
+{
+ struct path path;
+ unsigned lookup_flags = LOOKUP_FOLLOW | LOOKUP_AUTOMOUNT;
+ int ret = -EINVAL;
+
+ if ((params->at_flags & ~(AT_SYMLINK_NOFOLLOW | AT_NO_AUTOMOUNT |
+ AT_EMPTY_PATH)) != 0)
+ return -EINVAL;
+
+ if (params->at_flags & AT_SYMLINK_NOFOLLOW)
+ lookup_flags &= ~LOOKUP_FOLLOW;
+ if (params->at_flags & AT_NO_AUTOMOUNT)
+ lookup_flags &= ~LOOKUP_AUTOMOUNT;
+ if (params->at_flags & AT_EMPTY_PATH)
+ lookup_flags |= LOOKUP_EMPTY;
+
+retry:
+ ret = user_path_at(dfd, filename, lookup_flags, &path);
+ if (ret)
+ goto out;
+
+ ret = vfs_fsinfo(&path, params);
+ path_put(&path);
+ if (retry_estale(ret, lookup_flags)) {
+ lookup_flags |= LOOKUP_REVAL;
+ goto retry;
+ }
+out:
+ return ret;
+}
+
+static int vfs_fsinfo_fd(unsigned int fd, struct fsinfo_kparams *params)
+{
+ struct fd f = fdget_raw(fd);
+ int ret = -EBADF;
+
+ if (f.file) {
+ ret = vfs_fsinfo(&f.file->f_path, params);
+ fdput(f);
+ }
+ return ret;
+}
+
+/*
+ * Return buffer information by requestable attribute.
+ *
+ * STRUCT indicates a fixed-size structure with only one instance.
+ * STRUCT_N indicates a 1D array of STRUCT, indexed by Nth
+ * STRUCT_NM indicates a 2D-array of STRUCT, indexed by Nth, Mth
+ * STRING indicates a string with only one instance.
+ * STRING_N indicates a 1D array of STRING, indexed by Nth
+ * STRING_NM indicates a 2D-array of STRING, indexed by Nth, Mth
+ *
+ * If an entry is marked STRUCT, STRUCT_N or STRUCT_NM then if no buffer is
+ * supplied to sys_fsinfo(), sys_fsinfo() will handle returning the buffer size
+ * without calling vfs_fsinfo() and the filesystem.
+ *
+ * No struct may have more than 252 bytes (ie. 0x3f * 4)
+ */
+#define FSINFO_STRING(X,Y) [FSINFO_ATTR_##X] = 0x0000
+#define FSINFO_STRUCT(X,Y) [FSINFO_ATTR_##X] = sizeof(struct fsinfo_##Y)
+#define FSINFO_STRING_N(X,Y) [FSINFO_ATTR_##X] = 0x4000
+#define FSINFO_STRUCT_N(X,Y) [FSINFO_ATTR_##X] = 0x4000 | sizeof(struct fsinfo_##Y)
+#define FSINFO_STRUCT_NM(X,Y) [FSINFO_ATTR_##X] = 0x8000 | sizeof(struct fsinfo_##Y)
+#define FSINFO_STRING_NM(X,Y) [FSINFO_ATTR_##X] = 0x8000
+static const u16 fsinfo_buffer_sizes[FSINFO_ATTR__NR] = {
+ FSINFO_STRUCT (STATFS, statfs),
+ FSINFO_STRUCT (FSINFO, fsinfo),
+ FSINFO_STRUCT (IDS, ids),
+ FSINFO_STRUCT (LIMITS, limits),
+ FSINFO_STRUCT (CAPABILITIES, capabilities),
+ FSINFO_STRUCT (SUPPORTS, supports),
+ FSINFO_STRUCT (TIMESTAMP_INFO, timestamp_info),
+ FSINFO_STRING (VOLUME_ID, volume_id),
+ FSINFO_STRUCT (VOLUME_UUID, volume_uuid),
+ FSINFO_STRING (VOLUME_NAME, volume_name),
+ FSINFO_STRING (CELL_NAME, cell_name),
+ FSINFO_STRING (DOMAIN_NAME, domain_name),
+ FSINFO_STRING_N (SERVER_NAME, server_name),
+ FSINFO_STRUCT_NM (SERVER_ADDRESS, server_address),
+ FSINFO_STRING_NM (PARAMETER, parameter),
+ FSINFO_STRING_N (SOURCE, source),
+ FSINFO_STRING (NAME_ENCODING, name_encoding),
+ FSINFO_STRING (NAME_CODEPAGE, name_codepage),
+ FSINFO_STRUCT (IO_SIZE, io_size),
+};
+
+/**
+ * sys_fsinfo - System call to get filesystem information
+ * @dfd: Base directory to pathwalk from or fd referring to filesystem.
+ * @filename: Filesystem to query or NULL.
+ * @_params: Parameters to define request (or NULL for enhanced statfs).
+ * @_buffer: Result buffer.
+ * @buf_size: Size of result buffer.
+ *
+ * Get information on a filesystem. The filesystem attribute to be queried is
+ * indicated by @_params->request, and some of the attributes can have multiple
+ * values, indexed by @_params->Nth and @_params->Mth. If @_params is NULL,
+ * then the 0th fsinfo_attr_statfs attribute is queried. If an attribute does
+ * not exist, EOPNOTSUPP is returned; if the Nth,Mth value does not exist,
+ * ENODATA is returned.
+ *
+ * On success, the size of the attribute's value is returned. If @buf_size is
+ * 0 or @_buffer is NULL, only the size is returned. If the size of the value
+ * is larger than @buf_size, it will be truncated by the copy. If the size of
+ * the value is smaller than @buf_size then the excess buffer space will be
+ * cleared. The full size of the value will be returned, irrespective of how
+ * much data is actually placed in the buffer.
+ */
+SYSCALL_DEFINE5(fsinfo,
+ int, dfd, const char __user *, filename,
+ struct fsinfo_params __user *, _params,
+ void __user *, _buffer, size_t, buf_size)
+{
+ struct fsinfo_params user_params;
+ struct fsinfo_kparams params;
+ size_t size, n;
+ int ret;
+
+ if (_params) {
+ if (copy_from_user(&user_params, _params, sizeof(user_params)))
+ return -EFAULT;
+ if (user_params.__reserved[0] ||
+ user_params.__reserved[1] ||
+ user_params.__reserved[2] ||
+ user_params.__reserved[3] ||
+ user_params.__reserved[4] ||
+ user_params.__reserved[5])
+ return -EINVAL;
+ if (user_params.request >= FSINFO_ATTR__NR)
+ return -EOPNOTSUPP;
+ params.at_flags = user_params.at_flags;
+ params.request = user_params.request;
+ params.Nth = user_params.Nth;
+ params.Mth = user_params.Mth;
+ } else {
+ params.at_flags = 0;
+ params.request = FSINFO_ATTR_STATFS;
+ params.Nth = 0;
+ params.Mth = 0;
+ }
+
+ if (!_buffer || !buf_size) {
+ buf_size = 0;
+ _buffer = NULL;
+ }
+
+ /* Allocate an appropriately-sized buffer. We will truncate the
+ * contents when we write the contents back to userspace.
+ */
+ size = fsinfo_buffer_sizes[params.request];
+ switch (size & 0xc000) {
+ case 0x0000:
+ if (params.Nth != 0)
+ return -ENODATA;
+ /* Fall through */
+ case 0x4000:
+ if (params.Mth != 0)
+ return -ENODATA;
+ /* Fall through */
+ case 0x8000:
+ break;
+ case 0xc000:
+ return -ENOBUFS;
+ }
+
+ size &= ~0xc000;
+ if (size == 0) {
+ params.string_val = true;
+ params.buf_size = 4096;
+ } else {
+ params.string_val = false;
+ params.buf_size = size;
+ if (buf_size == 0)
+ return size; /* We know how big the buffer should be */
+ }
+
+ /* We always allocate a buffer for a string, even if buf_size == 0 and
+ * we're not going to return any data. This means that the filesystem
+ * code needn't care about whether the buffer actually exists or not.
+ */
+ params.buffer = kzalloc(params.buf_size, GFP_KERNEL);
+ if (!params.buffer)
+ return -ENOMEM;
+
+ if (filename)
+ ret = vfs_fsinfo_path(dfd, filename, ¶ms);
+ else
+ ret = vfs_fsinfo_fd(dfd, ¶ms);
+ if (ret < 0)
+ goto error;
+
+ n = ret;
+ if (n > buf_size)
+ n = buf_size;
+
+ if (n > 0 && copy_to_user(_buffer, params.buffer, buf_size))
+ ret = -EFAULT;
+
+ /* Clear any part of the buffer that we won't fill if we're putting a
+ * struct in there rather than a string.
+ */
+ if (buf_size > n && !params.string_val &&
+ clear_user(_buffer + n, buf_size - n) != 0)
+ return -EFAULT;
+error:
+ kfree(params.buffer);
+ return ret;
+}
struct fscrypt_operations;
struct fs_context;
struct fs_parameter_description;
+struct fsinfo_kparams;
+enum fsinfo_attribute;
extern void __init inode_init(void);
extern void __init inode_init_early(void);
int (*thaw_super) (struct super_block *);
int (*unfreeze_fs) (struct super_block *);
int (*statfs) (struct dentry *, struct kstatfs *);
+ int (*fsinfo) (struct path *, struct fsinfo_kparams *);
int (*remount_fs) (struct super_block *, int *, char *, size_t);
void (*umount_begin) (struct super_block *);
extern int vfs_statfs(const struct path *, struct kstatfs *);
extern int user_statfs(const char __user *, struct kstatfs *);
extern int fd_statfs(int, struct kstatfs *);
+extern int vfs_fsinfo(struct path *, struct fsinfo_kparams *);
extern int freeze_super(struct super_block *super);
extern int thaw_super(struct super_block *super);
extern bool our_mnt(struct vfsmount *mnt);
--- /dev/null
+/* Filesystem information query
+ *
+ * Copyright (C) 2018 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public Licence
+ * as published by the Free Software Foundation; either version
+ * 2 of the Licence, or (at your option) any later version.
+ */
+
+#ifndef _LINUX_FSINFO_H
+#define _LINUX_FSINFO_H
+
+#include <uapi/linux/fsinfo.h>
+
+struct fsinfo_kparams {
+ __u32 at_flags; /* AT_SYMLINK_NOFOLLOW and similar */
+ enum fsinfo_attribute request; /* What is being asking for */
+ __u32 Nth; /* Instance of it (some may have multiple) */
+ __u32 Mth; /* Subinstance */
+ bool string_val; /* T if variable-length string value */
+ void *buffer; /* Where to place the reply */
+ size_t buf_size; /* Size of the buffer */
+};
+
+extern int generic_fsinfo(struct path *, struct fsinfo_kparams *);
+
+static inline void fsinfo_set_cap(struct fsinfo_capabilities *c,
+ enum fsinfo_capability cap)
+{
+ c->capabilities[cap / 8] |= 1 << (cap % 8);
+}
+
+static inline void fsinfo_clear_cap(struct fsinfo_capabilities *c,
+ enum fsinfo_capability cap)
+{
+ c->capabilities[cap / 8] &= ~(1 << (cap % 8));
+}
+
+#endif /* _LINUX_FSINFO_H */
struct statfs;
struct statfs64;
struct statx;
+struct fsinfo_params;
struct __sysctl_args;
struct sysinfo;
struct timespec;
const void __user *value, int aux);
asmlinkage long sys_fsmount(int fs_fd, unsigned int flags, unsigned int ms_flags);
asmlinkage long sys_fspick(int dfd, const char __user *path, unsigned int flags);
+asmlinkage long sys_fsinfo(int dfd, const char __user *path,
+ struct fsinfo_params __user *params,
+ void __user *buffer, size_t buf_size);
/*
* Architecture-specific system calls
--- /dev/null
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+/* fsinfo() definitions.
+ *
+ * Copyright (C) 2018 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ */
+#ifndef _UAPI_LINUX_FSINFO_H
+#define _UAPI_LINUX_FSINFO_H
+
+#include <linux/types.h>
+#include <linux/socket.h>
+
+/*
+ * The filesystem attributes that can be requested. Note that some attributes
+ * may have multiple instances which can be switched in the parameter block.
+ */
+enum fsinfo_attribute {
+ FSINFO_ATTR_STATFS = 0, /* statfs()-style state */
+ FSINFO_ATTR_FSINFO = 1, /* Information about fsinfo() */
+ FSINFO_ATTR_IDS = 2, /* Filesystem IDs */
+ FSINFO_ATTR_LIMITS = 3, /* Filesystem limits */
+ FSINFO_ATTR_SUPPORTS = 4, /* What's supported in statx, iocflags, ... */
+ FSINFO_ATTR_CAPABILITIES = 5, /* Filesystem capabilities (bits) */
+ FSINFO_ATTR_TIMESTAMP_INFO = 6, /* Inode timestamp info */
+ FSINFO_ATTR_VOLUME_ID = 7, /* Volume ID (string) */
+ FSINFO_ATTR_VOLUME_UUID = 8, /* Volume UUID (LE uuid) */
+ FSINFO_ATTR_VOLUME_NAME = 9, /* Volume name (string) */
+ FSINFO_ATTR_CELL_NAME = 10, /* Cell name (string) */
+ FSINFO_ATTR_DOMAIN_NAME = 11, /* Domain name (string) */
+ FSINFO_ATTR_SERVER_NAME = 12, /* Name of the Nth server */
+ FSINFO_ATTR_SERVER_ADDRESS = 13, /* Mth address of the Nth server */
+ FSINFO_ATTR_PARAMETER = 14, /* Nth mount parameter (string) */
+ FSINFO_ATTR_SOURCE = 15, /* Nth mount source name (string) */
+ FSINFO_ATTR_NAME_ENCODING = 16, /* Filename encoding (string) */
+ FSINFO_ATTR_NAME_CODEPAGE = 17, /* Filename codepage (string) */
+ FSINFO_ATTR_IO_SIZE = 18, /* Optimal I/O sizes */
+ FSINFO_ATTR__NR
+};
+
+/*
+ * Optional fsinfo() parameter structure.
+ *
+ * If this is not given, it is assumed that fsinfo_attr_statfs instance 0,0 is
+ * desired.
+ */
+struct fsinfo_params {
+ __u32 at_flags; /* AT_SYMLINK_NOFOLLOW and similar flags */
+ __u32 request; /* What is being asking for (enum fsinfo_attribute) */
+ __u32 Nth; /* Instance of it (some may have multiple) */
+ __u32 Mth; /* Subinstance of Nth instance */
+ __u32 __reserved[6]; /* Reserved params; all must be 0 */
+};
+
+/*
+ * Information struct for fsinfo(fsinfo_attr_statfs).
+ * - This gives extended filesystem information.
+ */
+struct fsinfo_statfs {
+ __u64 f_blocks; /* Total number of blocks in fs */
+ __u64 f_bfree; /* Total number of free blocks */
+ __u64 f_bavail; /* Number of free blocks available to ordinary user */
+ __u64 f_files; /* Total number of file nodes in fs */
+ __u64 f_ffree; /* Number of free file nodes */
+ __u64 f_favail; /* Number of free file nodes available to ordinary user */
+ __u32 f_bsize; /* Optimal block size */
+ __u32 f_frsize; /* Fragment size */
+};
+
+/*
+ * Information struct for fsinfo(fsinfo_attr_ids).
+ *
+ * List of basic identifiers as is normally found in statfs().
+ */
+struct fsinfo_ids {
+ char f_fs_name[15 + 1];
+ __u64 f_flags; /* Filesystem mount flags (MS_*) */
+ __u64 f_fsid; /* Short 64-bit Filesystem ID (as statfs) */
+ __u64 f_sb_id; /* Internal superblock ID for sbnotify()/mntnotify() */
+ __u32 f_fstype; /* Filesystem type from linux/magic.h [uncond] */
+ __u32 f_dev_major; /* As st_dev_* from struct statx [uncond] */
+ __u32 f_dev_minor;
+ __u32 __reserved[1];
+};
+
+/*
+ * Information struct for fsinfo(fsinfo_attr_limits).
+ *
+ * List of supported filesystem limits.
+ */
+struct fsinfo_limits {
+ __u64 max_file_size; /* Maximum file size */
+ __u64 max_uid; /* Maximum UID supported */
+ __u64 max_gid; /* Maximum GID supported */
+ __u64 max_projid; /* Maximum project ID supported */
+ __u32 max_dev_major; /* Maximum device major representable */
+ __u32 max_dev_minor; /* Maximum device minor representable */
+ __u32 max_hard_links; /* Maximum number of hard links on a file */
+ __u32 max_xattr_body_len; /* Maximum xattr content length */
+ __u32 max_xattr_name_len; /* Maximum xattr name length */
+ __u32 max_filename_len; /* Maximum filename length */
+ __u32 max_symlink_len; /* Maximum symlink content length */
+ __u32 __reserved[1];
+};
+
+/*
+ * Information struct for fsinfo(fsinfo_attr_supports).
+ *
+ * What's supported in various masks, such as statx() attribute and mask bits
+ * and IOC flags.
+ */
+struct fsinfo_supports {
+ __u64 stx_attributes; /* What statx::stx_attributes are supported */
+ __u32 stx_mask; /* What statx::stx_mask bits are supported */
+ __u32 ioc_flags; /* What FS_IOC_* flags are supported */
+ __u32 win_file_attrs; /* What DOS/Windows FILE_* attributes are supported */
+ __u32 __reserved[1];
+};
+
+/*
+ * Information struct for fsinfo(fsinfo_attr_capabilities).
+ *
+ * Bitmask indicating filesystem capabilities where renderable as single bits.
+ */
+enum fsinfo_capability {
+ FSINFO_CAP_IS_KERNEL_FS = 0, /* fs is kernel-special filesystem */
+ FSINFO_CAP_IS_BLOCK_FS = 1, /* fs is block-based filesystem */
+ FSINFO_CAP_IS_FLASH_FS = 2, /* fs is flash filesystem */
+ FSINFO_CAP_IS_NETWORK_FS = 3, /* fs is network filesystem */
+ FSINFO_CAP_IS_AUTOMOUNTER_FS = 4, /* fs is automounter special filesystem */
+ FSINFO_CAP_AUTOMOUNTS = 5, /* fs supports automounts */
+ FSINFO_CAP_ADV_LOCKS = 6, /* fs supports advisory file locking */
+ FSINFO_CAP_MAND_LOCKS = 7, /* fs supports mandatory file locking */
+ FSINFO_CAP_LEASES = 8, /* fs supports file leases */
+ FSINFO_CAP_UIDS = 9, /* fs supports numeric uids */
+ FSINFO_CAP_GIDS = 10, /* fs supports numeric gids */
+ FSINFO_CAP_PROJIDS = 11, /* fs supports numeric project ids */
+ FSINFO_CAP_ID_NAMES = 12, /* fs supports user names */
+ FSINFO_CAP_ID_GUIDS = 13, /* fs supports user guids */
+ FSINFO_CAP_WINDOWS_ATTRS = 14, /* fs has windows attributes */
+ FSINFO_CAP_USER_QUOTAS = 15, /* fs has per-user quotas */
+ FSINFO_CAP_GROUP_QUOTAS = 16, /* fs has per-group quotas */
+ FSINFO_CAP_PROJECT_QUOTAS = 17, /* fs has per-project quotas */
+ FSINFO_CAP_XATTRS = 18, /* fs has xattrs */
+ FSINFO_CAP_JOURNAL = 19, /* fs has a journal */
+ FSINFO_CAP_DATA_IS_JOURNALLED = 20, /* fs is using data journalling */
+ FSINFO_CAP_O_SYNC = 21, /* fs supports O_SYNC */
+ FSINFO_CAP_O_DIRECT = 22, /* fs supports O_DIRECT */
+ FSINFO_CAP_VOLUME_ID = 23, /* fs has a volume ID */
+ FSINFO_CAP_VOLUME_UUID = 24, /* fs has a volume UUID */
+ FSINFO_CAP_VOLUME_NAME = 25, /* fs has a volume name */
+ FSINFO_CAP_VOLUME_FSID = 26, /* fs has a volume FSID */
+ FSINFO_CAP_CELL_NAME = 27, /* fs has a cell name */
+ FSINFO_CAP_DOMAIN_NAME = 28, /* fs has a domain name */
+ FSINFO_CAP_REALM_NAME = 29, /* fs has a realm name */
+ FSINFO_CAP_IVER_ALL_CHANGE = 30, /* i_version represents data + meta changes */
+ FSINFO_CAP_IVER_DATA_CHANGE = 31, /* i_version represents data changes only */
+ FSINFO_CAP_IVER_MONO_INCR = 32, /* i_version incremented monotonically */
+ FSINFO_CAP_SYMLINKS = 33, /* fs supports symlinks */
+ FSINFO_CAP_HARD_LINKS = 34, /* fs supports hard links */
+ FSINFO_CAP_HARD_LINKS_1DIR = 35, /* fs supports hard links in same dir only */
+ FSINFO_CAP_DEVICE_FILES = 36, /* fs supports bdev, cdev */
+ FSINFO_CAP_UNIX_SPECIALS = 37, /* fs supports pipe, fifo, socket */
+ FSINFO_CAP_RESOURCE_FORKS = 38, /* fs supports resource forks/streams */
+ FSINFO_CAP_NAME_CASE_INDEP = 39, /* Filename case independence is mandatory */
+ FSINFO_CAP_NAME_NON_UTF8 = 40, /* fs has non-utf8 names */
+ FSINFO_CAP_NAME_HAS_CODEPAGE = 41, /* fs has a filename codepage */
+ FSINFO_CAP_SPARSE = 42, /* fs supports sparse files */
+ FSINFO_CAP_NOT_PERSISTENT = 43, /* fs is not persistent */
+ FSINFO_CAP_NO_UNIX_MODE = 44, /* fs does not support unix mode bits */
+ FSINFO_CAP_HAS_ATIME = 45, /* fs supports access time */
+ FSINFO_CAP_HAS_BTIME = 46, /* fs supports birth/creation time */
+ FSINFO_CAP_HAS_CTIME = 47, /* fs supports change time */
+ FSINFO_CAP_HAS_MTIME = 48, /* fs supports modification time */
+ FSINFO_CAP__NR
+};
+
+struct fsinfo_capabilities {
+ __u8 capabilities[(FSINFO_CAP__NR + 7) / 8];
+};
+
+/*
+ * Information struct for fsinfo(fsinfo_attr_timestamp_info).
+ */
+struct fsinfo_timestamp_info {
+ __s64 minimum_timestamp; /* Minimum timestamp value in seconds */
+ __s64 maximum_timestamp; /* Maximum timestamp value in seconds */
+ __u16 atime_gran_mantissa; /* Granularity(secs) = mant * 10^exp */
+ __u16 btime_gran_mantissa;
+ __u16 ctime_gran_mantissa;
+ __u16 mtime_gran_mantissa;
+ __s8 atime_gran_exponent;
+ __s8 btime_gran_exponent;
+ __s8 ctime_gran_exponent;
+ __s8 mtime_gran_exponent;
+ __u32 __reserved[1];
+};
+
+/*
+ * Information struct for fsinfo(fsinfo_attr_volume_uuid).
+ */
+struct fsinfo_volume_uuid {
+ __u8 uuid[16];
+};
+
+/*
+ * Information struct for fsinfo(fsinfo_attr_server_addresses).
+ *
+ * Find the Mth address of the Nth server for a network mount.
+ */
+struct fsinfo_server_address {
+ struct __kernel_sockaddr_storage address;
+};
+
+/*
+ * Information struct for fsinfo(fsinfo_attr_io_size).
+ *
+ * Retrieve I/O size hints for a filesystem.
+ */
+struct fsinfo_io_size {
+ __u32 dio_size_gran; /* Size granularity for O_DIRECT */
+ __u32 dio_mem_align; /* Memory alignment for O_DIRECT */
+};
+
+/*
+ * Information struct for fsinfo(fsinfo_attr_fsinfo).
+ *
+ * This gives information about fsinfo() itself.
+ */
+struct fsinfo_fsinfo {
+ __u32 max_attr; /* Number of supported attributes (fsinfo_attr__nr) */
+ __u32 max_cap; /* Number of supported capabilities (fsinfo_cap__nr) */
+};
+
+#endif /* _UAPI_LINUX_FSINFO_H */
# List of programs to build
hostprogs-$(CONFIG_SAMPLE_VFS) := \
+ test-fsinfo \
test-fsmount \
test-statx
# Tell kbuild to always build the programs
always := $(hostprogs-y)
+HOSTCFLAGS_test-fsinfo.o += -I$(objtree)/usr/include
+HOSTLDLIBS_test-fsinfo += -lm
+
HOSTCFLAGS_test-fsmount.o += -I$(objtree)/usr/include
HOSTCFLAGS_test-statx.o += -I$(objtree)/usr/include
--- /dev/null
+/* Test the fsinfo() system call
+ *
+ * Copyright (C) 2018 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public Licence
+ * as published by the Free Software Foundation; either version
+ * 2 of the Licence, or (at your option) any later version.
+ */
+
+#define _GNU_SOURCE
+#define _ATFILE_SOURCE
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <string.h>
+#include <unistd.h>
+#include <ctype.h>
+#include <errno.h>
+#include <time.h>
+#include <math.h>
+#include <fcntl.h>
+#include <sys/syscall.h>
+#include <linux/fsinfo.h>
+#include <linux/socket.h>
+#include <sys/stat.h>
+#include <arpa/inet.h>
+
+#ifndef __NR_fsinfo
+#define __NR_fsinfo -1
+#endif
+
+static bool debug = 0;
+
+static __attribute__((unused))
+ssize_t fsinfo(int dfd, const char *filename, struct fsinfo_params *params,
+ void *buffer, size_t buf_size)
+{
+ return syscall(__NR_fsinfo, dfd, filename, params, buffer, buf_size);
+}
+
+#define FSINFO_STRING(X,Y) [FSINFO_ATTR_##X] = 0x0000
+#define FSINFO_STRUCT(X,Y) [FSINFO_ATTR_##X] = sizeof(struct fsinfo_##Y)
+#define FSINFO_STRING_N(X,Y) [FSINFO_ATTR_##X] = 0x4000
+#define FSINFO_STRUCT_N(X,Y) [FSINFO_ATTR_##X] = 0x4000 | sizeof(struct fsinfo_##Y)
+#define FSINFO_STRUCT_NM(X,Y) [FSINFO_ATTR_##X] = 0x8000 | sizeof(struct fsinfo_##Y)
+#define FSINFO_STRING_NM(X,Y) [FSINFO_ATTR_##X] = 0x8000
+static const __u16 fsinfo_buffer_sizes[FSINFO_ATTR__NR] = {
+ FSINFO_STRUCT (STATFS, statfs),
+ FSINFO_STRUCT (FSINFO, fsinfo),
+ FSINFO_STRUCT (IDS, ids),
+ FSINFO_STRUCT (LIMITS, limits),
+ FSINFO_STRUCT (CAPABILITIES, capabilities),
+ FSINFO_STRUCT (SUPPORTS, supports),
+ FSINFO_STRUCT (TIMESTAMP_INFO, timestamp_info),
+ FSINFO_STRING (VOLUME_ID, volume_id),
+ FSINFO_STRUCT (VOLUME_UUID, volume_uuid),
+ FSINFO_STRING (VOLUME_NAME, volume_name),
+ FSINFO_STRING (CELL_NAME, cell_name),
+ FSINFO_STRING (DOMAIN_NAME, domain_name),
+ FSINFO_STRING_N (SERVER_NAME, server_name),
+ FSINFO_STRUCT_NM (SERVER_ADDRESS, server_address),
+ FSINFO_STRING_NM (PARAMETER, parameter),
+ FSINFO_STRING_N (SOURCE, source),
+ FSINFO_STRING (NAME_ENCODING, name_encoding),
+ FSINFO_STRING (NAME_CODEPAGE, name_codepage),
+ FSINFO_STRUCT (IO_SIZE, io_size),
+};
+
+#define FSINFO_NAME(X,Y) [FSINFO_ATTR_##X] = #Y
+static const char *fsinfo_attr_names[FSINFO_ATTR__NR] = {
+ FSINFO_NAME (STATFS, statfs),
+ FSINFO_NAME (FSINFO, fsinfo),
+ FSINFO_NAME (IDS, ids),
+ FSINFO_NAME (LIMITS, limits),
+ FSINFO_NAME (CAPABILITIES, capabilities),
+ FSINFO_NAME (SUPPORTS, supports),
+ FSINFO_NAME (TIMESTAMP_INFO, timestamp_info),
+ FSINFO_NAME (VOLUME_ID, volume_id),
+ FSINFO_NAME (VOLUME_UUID, volume_uuid),
+ FSINFO_NAME (VOLUME_NAME, volume_name),
+ FSINFO_NAME (CELL_NAME, cell_name),
+ FSINFO_NAME (DOMAIN_NAME, domain_name),
+ FSINFO_NAME (SERVER_NAME, server_name),
+ FSINFO_NAME (SERVER_ADDRESS, server_address),
+ FSINFO_NAME (PARAMETER, parameter),
+ FSINFO_NAME (SOURCE, source),
+ FSINFO_NAME (NAME_ENCODING, name_encoding),
+ FSINFO_NAME (NAME_CODEPAGE, name_codepage),
+ FSINFO_NAME (IO_SIZE, io_size),
+};
+
+union reply {
+ char buffer[4096];
+ struct fsinfo_statfs statfs;
+ struct fsinfo_fsinfo fsinfo;
+ struct fsinfo_ids ids;
+ struct fsinfo_limits limits;
+ struct fsinfo_supports supports;
+ struct fsinfo_capabilities caps;
+ struct fsinfo_timestamp_info timestamps;
+ struct fsinfo_volume_uuid uuid;
+ struct fsinfo_server_address srv_addr;
+ struct fsinfo_io_size io_size;
+};
+
+static void dump_hex(unsigned int *data, int from, int to)
+{
+ unsigned offset, print_offset = 1, col = 0;
+
+ from /= 4;
+ to = (to + 3) / 4;
+
+ for (offset = from; offset < to; offset++) {
+ if (print_offset) {
+ printf("%04x: ", offset * 8);
+ print_offset = 0;
+ }
+ printf("%08x", data[offset]);
+ col++;
+ if ((col & 3) == 0) {
+ printf("\n");
+ print_offset = 1;
+ } else {
+ printf(" ");
+ }
+ }
+
+ if (!print_offset)
+ printf("\n");
+}
+
+static void dump_attr_STATFS(union reply *r, int size)
+{
+ struct fsinfo_statfs *f = &r->statfs;
+
+ printf("\n");
+ printf("\tblocks: n=%llu fr=%llu av=%llu\n",
+ (unsigned long long)f->f_blocks,
+ (unsigned long long)f->f_bfree,
+ (unsigned long long)f->f_bavail);
+
+ printf("\tfiles : n=%llu fr=%llu av=%llu\n",
+ (unsigned long long)f->f_files,
+ (unsigned long long)f->f_ffree,
+ (unsigned long long)f->f_favail);
+ printf("\tbsize : %u\n", f->f_bsize);
+ printf("\tfrsize: %u\n", f->f_frsize);
+}
+
+static void dump_attr_FSINFO(union reply *r, int size)
+{
+ struct fsinfo_fsinfo *f = &r->fsinfo;
+
+ printf("max_attr=%u max_cap=%u\n", f->max_attr, f->max_cap);
+}
+
+static void dump_attr_IDS(union reply *r, int size)
+{
+ struct fsinfo_ids *f = &r->ids;
+
+ printf("\n");
+ printf("\tdev : %02x:%02x\n", f->f_dev_major, f->f_dev_minor);
+ printf("\tfs : type=%x name=%s\n", f->f_fstype, f->f_fs_name);
+ printf("\tflags : %llx\n", (unsigned long long)f->f_flags);
+ printf("\tfsid : %llx\n", (unsigned long long)f->f_fsid);
+}
+
+static void dump_attr_LIMITS(union reply *r, int size)
+{
+ struct fsinfo_limits *f = &r->limits;
+
+ printf("\n");
+ printf("\tmax file size: %llx\n",
+ (unsigned long long)f->max_file_size);
+ printf("\tmax ids : u=%llx g=%llx p=%llx\n",
+ (unsigned long long)f->max_uid,
+ (unsigned long long)f->max_gid,
+ (unsigned long long)f->max_projid);
+ printf("\tmax dev : maj=%x min=%x\n",
+ f->max_dev_major, f->max_dev_minor);
+ printf("\tmax links : %x\n", f->max_hard_links);
+ printf("\tmax xattr : n=%x b=%x\n",
+ f->max_xattr_name_len, f->max_xattr_body_len);
+ printf("\tmax len : file=%x sym=%x\n",
+ f->max_filename_len, f->max_symlink_len);
+}
+
+static void dump_attr_SUPPORTS(union reply *r, int size)
+{
+ struct fsinfo_supports *f = &r->supports;
+
+ printf("\n");
+ printf("\tstx_attr=%llx\n", (unsigned long long)f->stx_attributes);
+ printf("\tstx_mask=%x\n", f->stx_mask);
+ printf("\tioc_flags=%x\n", f->ioc_flags);
+ printf("\twin_fattrs=%x\n", f->win_file_attrs);
+}
+
+#define FSINFO_CAP_NAME(C) [FSINFO_CAP_##C] = #C
+static const char *fsinfo_cap_names[FSINFO_CAP__NR] = {
+ FSINFO_CAP_NAME(IS_KERNEL_FS),
+ FSINFO_CAP_NAME(IS_BLOCK_FS),
+ FSINFO_CAP_NAME(IS_FLASH_FS),
+ FSINFO_CAP_NAME(IS_NETWORK_FS),
+ FSINFO_CAP_NAME(IS_AUTOMOUNTER_FS),
+ FSINFO_CAP_NAME(AUTOMOUNTS),
+ FSINFO_CAP_NAME(ADV_LOCKS),
+ FSINFO_CAP_NAME(MAND_LOCKS),
+ FSINFO_CAP_NAME(LEASES),
+ FSINFO_CAP_NAME(UIDS),
+ FSINFO_CAP_NAME(GIDS),
+ FSINFO_CAP_NAME(PROJIDS),
+ FSINFO_CAP_NAME(ID_NAMES),
+ FSINFO_CAP_NAME(ID_GUIDS),
+ FSINFO_CAP_NAME(WINDOWS_ATTRS),
+ FSINFO_CAP_NAME(USER_QUOTAS),
+ FSINFO_CAP_NAME(GROUP_QUOTAS),
+ FSINFO_CAP_NAME(PROJECT_QUOTAS),
+ FSINFO_CAP_NAME(XATTRS),
+ FSINFO_CAP_NAME(JOURNAL),
+ FSINFO_CAP_NAME(DATA_IS_JOURNALLED),
+ FSINFO_CAP_NAME(O_SYNC),
+ FSINFO_CAP_NAME(O_DIRECT),
+ FSINFO_CAP_NAME(VOLUME_ID),
+ FSINFO_CAP_NAME(VOLUME_UUID),
+ FSINFO_CAP_NAME(VOLUME_NAME),
+ FSINFO_CAP_NAME(VOLUME_FSID),
+ FSINFO_CAP_NAME(CELL_NAME),
+ FSINFO_CAP_NAME(DOMAIN_NAME),
+ FSINFO_CAP_NAME(REALM_NAME),
+ FSINFO_CAP_NAME(IVER_ALL_CHANGE),
+ FSINFO_CAP_NAME(IVER_DATA_CHANGE),
+ FSINFO_CAP_NAME(IVER_MONO_INCR),
+ FSINFO_CAP_NAME(SYMLINKS),
+ FSINFO_CAP_NAME(HARD_LINKS),
+ FSINFO_CAP_NAME(HARD_LINKS_1DIR),
+ FSINFO_CAP_NAME(DEVICE_FILES),
+ FSINFO_CAP_NAME(UNIX_SPECIALS),
+ FSINFO_CAP_NAME(RESOURCE_FORKS),
+ FSINFO_CAP_NAME(NAME_CASE_INDEP),
+ FSINFO_CAP_NAME(NAME_NON_UTF8),
+ FSINFO_CAP_NAME(NAME_HAS_CODEPAGE),
+ FSINFO_CAP_NAME(SPARSE),
+ FSINFO_CAP_NAME(NOT_PERSISTENT),
+ FSINFO_CAP_NAME(NO_UNIX_MODE),
+ FSINFO_CAP_NAME(HAS_ATIME),
+ FSINFO_CAP_NAME(HAS_BTIME),
+ FSINFO_CAP_NAME(HAS_CTIME),
+ FSINFO_CAP_NAME(HAS_MTIME),
+};
+
+static void dump_attr_CAPABILITIES(union reply *r, int size)
+{
+ struct fsinfo_capabilities *f = &r->caps;
+ int i;
+
+ for (i = 0; i < sizeof(f->capabilities); i++)
+ printf("%02x", f->capabilities[i]);
+ printf("\n");
+ for (i = 0; i < FSINFO_CAP__NR; i++)
+ if (f->capabilities[i / 8] & (1 << (i % 8)))
+ printf("\t- %s\n", fsinfo_cap_names[i]);
+}
+
+static void dump_attr_TIMESTAMP_INFO(union reply *r, int size)
+{
+ struct fsinfo_timestamp_info *f = &r->timestamps;
+
+ printf("range=%llx-%llx\n",
+ (unsigned long long)f->minimum_timestamp,
+ (unsigned long long)f->maximum_timestamp);
+
+#define print_time(G) \
+ printf("\t"#G"time : gran=%gs\n", \
+ (f->G##time_gran_mantissa * \
+ pow(10., f->G##time_gran_exponent)))
+ print_time(a);
+ print_time(b);
+ print_time(c);
+ print_time(m);
+}
+
+static void dump_attr_VOLUME_UUID(union reply *r, int size)
+{
+ struct fsinfo_volume_uuid *f = &r->uuid;
+
+ printf("%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x"
+ "-%02x%02x%02x%02x%02x%02x\n",
+ f->uuid[ 0], f->uuid[ 1],
+ f->uuid[ 2], f->uuid[ 3],
+ f->uuid[ 4], f->uuid[ 5],
+ f->uuid[ 6], f->uuid[ 7],
+ f->uuid[ 8], f->uuid[ 9],
+ f->uuid[10], f->uuid[11],
+ f->uuid[12], f->uuid[13],
+ f->uuid[14], f->uuid[15]);
+}
+
+static void dump_attr_SERVER_ADDRESS(union reply *r, int size)
+{
+ struct fsinfo_server_address *f = &r->srv_addr;
+ struct sockaddr_in6 *sin6;
+ struct sockaddr_in *sin;
+ char buf[1024];
+
+ switch (f->address.ss_family) {
+ case AF_INET:
+ sin = (struct sockaddr_in *)&f->address;
+ if (!inet_ntop(AF_INET, &sin->sin_addr, buf, sizeof(buf)))
+ break;
+ printf("IPv4: %s\n", buf);
+ return;
+ case AF_INET6:
+ sin6 = (struct sockaddr_in6 *)&f->address;
+ if (!inet_ntop(AF_INET6, &sin6->sin6_addr, buf, sizeof(buf)))
+ break;
+ printf("IPv6: %s\n", buf);
+ return;
+ }
+
+ printf("family=%u\n", f->address.ss_family);
+}
+
+static void dump_attr_IO_SIZE(union reply *r, int size)
+{
+ struct fsinfo_io_size *f = &r->io_size;
+
+ printf("dio_size=%u\n", f->dio_size_gran);
+}
+
+/*
+ *
+ */
+typedef void (*dumper_t)(union reply *r, int size);
+
+#define FSINFO_DUMPER(N) [FSINFO_ATTR_##N] = dump_attr_##N
+static const dumper_t fsinfo_attr_dumper[FSINFO_ATTR__NR] = {
+ FSINFO_DUMPER(STATFS),
+ FSINFO_DUMPER(FSINFO),
+ FSINFO_DUMPER(IDS),
+ FSINFO_DUMPER(LIMITS),
+ FSINFO_DUMPER(SUPPORTS),
+ FSINFO_DUMPER(CAPABILITIES),
+ FSINFO_DUMPER(TIMESTAMP_INFO),
+ FSINFO_DUMPER(VOLUME_UUID),
+ FSINFO_DUMPER(SERVER_ADDRESS),
+ FSINFO_DUMPER(IO_SIZE),
+};
+
+static void dump_fsinfo(enum fsinfo_attribute attr, __u8 about,
+ union reply *r, int size)
+{
+ dumper_t dumper = fsinfo_attr_dumper[attr];
+ unsigned int len;
+
+ if (!dumper) {
+ printf("<no dumper>\n");
+ return;
+ }
+
+ len = about & 0x3fff;
+ if (size < len) {
+ printf("<short data %u/%u>\n", size, len);
+ return;
+ }
+
+ dumper(r, size);
+}
+
+/*
+ * Try one subinstance of an attribute.
+ */
+static int try_one(const char *file, struct fsinfo_params *params, bool raw)
+{
+ union reply r;
+ char *p;
+ int ret;
+ __u16 about;
+
+ memset(&r.buffer, 0xbd, sizeof(r.buffer));
+
+ errno = 0;
+ ret = fsinfo(AT_FDCWD, file, params, r.buffer, sizeof(r.buffer));
+ if (params->request >= FSINFO_ATTR__NR) {
+ if (ret == -1 && errno == EOPNOTSUPP)
+ exit(0);
+ fprintf(stderr, "Unexpected error for too-large command %u: %m\n",
+ params->request);
+ exit(1);
+ }
+
+ if (debug)
+ printf("fsinfo(%s,%s,%u,%u) = %d: %m\n",
+ file, fsinfo_attr_names[params->request],
+ params->Nth, params->Mth, ret);
+
+ about = fsinfo_buffer_sizes[params->request];
+ if (ret == -1) {
+ if (errno == ENODATA) {
+ switch (about & 0xc000) {
+ case 0x0000:
+ if (params->Nth == 0 && params->Mth == 0) {
+ fprintf(stderr,
+ "Unexpected ENODATA1 (%u[%u][%u])\n",
+ params->request, params->Nth, params->Mth);
+ exit(1);
+ }
+ break;
+ case 0x4000:
+ if (params->Nth == 0 && params->Mth == 0) {
+ fprintf(stderr,
+ "Unexpected ENODATA2 (%u[%u][%u])\n",
+ params->request, params->Nth, params->Mth);
+ exit(1);
+ }
+ break;
+ }
+ return (params->Mth == 0) ? 2 : 1;
+ }
+ if (errno == EOPNOTSUPP) {
+ if (params->Nth > 0 || params->Mth > 0) {
+ fprintf(stderr,
+ "Should return -ENODATA (%u[%u][%u])\n",
+ params->request, params->Nth, params->Mth);
+ exit(1);
+ }
+ //printf("\e[33m%s\e[m: <not supported>\n",
+ // fsinfo_attr_names[attr]);
+ return 2;
+ }
+ perror(file);
+ exit(1);
+ }
+
+ if (raw) {
+ if (ret > 4096)
+ ret = 4096;
+ dump_hex((unsigned int *)&r.buffer, 0, ret);
+ return 0;
+ }
+
+ switch (params->request) {
+ case FSINFO_ATTR_PARAMETER:
+ if (ret == 0)
+ return 0;
+ }
+
+ switch (about & 0xc000) {
+ case 0x0000:
+ printf("\e[33m%s\e[m: ",
+ fsinfo_attr_names[params->request]);
+ break;
+ case 0x4000:
+ printf("\e[33m%s[%u]\e[m: ",
+ fsinfo_attr_names[params->request],
+ params->Nth);
+ break;
+ case 0x8000:
+ printf("\e[33m%s[%u][%u]\e[m: ",
+ fsinfo_attr_names[params->request],
+ params->Nth, params->Mth);
+ break;
+ }
+
+ switch (about) {
+ /* Struct */
+ case 0x0001 ... 0x3fff:
+ case 0x4001 ... 0x7fff:
+ case 0x8001 ... 0xbfff:
+ dump_fsinfo(params->request, about, &r, ret);
+ return 0;
+
+ /* String */
+ case 0x0000:
+ case 0x4000:
+ case 0x8000:
+ if (ret >= 4096) {
+ ret = 4096;
+ r.buffer[4092] = '.';
+ r.buffer[4093] = '.';
+ r.buffer[4094] = '.';
+ r.buffer[4095] = 0;
+ } else {
+ r.buffer[ret] = 0;
+ }
+ for (p = r.buffer; *p; p++) {
+ if (!isprint(*p)) {
+ printf("<non-printable>\n");
+ continue;
+ }
+ }
+ printf("%s\n", r.buffer);
+ return 0;
+
+ default:
+ fprintf(stderr, "Fishy about %u %02x\n", params->request, about);
+ exit(1);
+ }
+}
+
+/*
+ *
+ */
+int main(int argc, char **argv)
+{
+ struct fsinfo_params params = {
+ .at_flags = AT_SYMLINK_NOFOLLOW,
+ };
+ unsigned int attr;
+ int raw = 0, opt, Nth, Mth;
+
+ while ((opt = getopt(argc, argv, "adlr"))) {
+ switch (opt) {
+ case 'a':
+ params.at_flags |= AT_NO_AUTOMOUNT;
+ continue;
+ case 'd':
+ debug = true;
+ continue;
+ case 'l':
+ params.at_flags &= ~AT_SYMLINK_NOFOLLOW;
+ continue;
+ case 'r':
+ raw = 1;
+ continue;
+ }
+ break;
+ }
+
+ argc -= optind;
+ argv += optind;
+
+ if (argc != 1) {
+ printf("Format: test-fsinfo [-alr] <file>\n");
+ exit(2);
+ }
+
+ for (attr = 0; attr <= FSINFO_ATTR__NR; attr++) {
+ Nth = 0;
+ do {
+ Mth = 0;
+ do {
+ params.request = attr;
+ params.Nth = Nth;
+ params.Mth = Mth;
+
+ switch (try_one(argv[0], ¶ms, raw)) {
+ case 0:
+ continue;
+ case 1:
+ goto done_M;
+ case 2:
+ goto done_N;
+ }
+ } while (++Mth < 100);
+
+ done_M:
+ if (Mth >= 100) {
+ fprintf(stderr, "Fishy: Mth == %u\n", Mth);
+ break;
+ }
+
+ } while (++Nth < 100);
+
+ done_N:
+ if (Nth >= 100) {
+ fprintf(stderr, "Fishy: Nth == %u\n", Nth);
+ break;
+ }
+ }
+
+ return 0;
+}
projects / users / willy / linux.git / commitdiff