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Registered in England and Wales under Company Registration No. 3798903 Subject: [PATCH 17/17] fsinfo: Add example support for NFS [ver #17] From: David Howells To: viro@zeniv.linux.org.uk Cc: dhowells@redhat.com, raven@themaw.net, mszeredi@redhat.com, christian@brauner.io, jannh@google.com, darrick.wong@oracle.com, linux-api@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Date: Fri, 21 Feb 2020 18:04:03 +0000 Message-ID: <158230824387.2185128.15121791656930144608.stgit@warthog.procyon.org.uk> In-Reply-To: <158230810644.2185128.16726948836367716086.stgit@warthog.procyon.org.uk> References: <158230810644.2185128.16726948836367716086.stgit@warthog.procyon.org.uk> User-Agent: StGit/0.21 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Add the ability to list NFS server addresses and hostname, timestamp information and capabilities as an example. Signed-off-by: David Howells cc: linux-nfs@vger.kernel.org --- fs/nfs/Makefile | 1 fs/nfs/fsinfo.c | 230 ++++++++++++++++++++++++++++++++++++++++++ fs/nfs/internal.h | 6 + fs/nfs/nfs4super.c | 3 + fs/nfs/super.c | 3 + include/uapi/linux/fsinfo.h | 29 +++++ include/uapi/linux/windows.h | 35 ++++++ samples/vfs/test-fsinfo.c | 40 +++++++ 8 files changed, 347 insertions(+) create mode 100644 fs/nfs/fsinfo.c create mode 100644 include/uapi/linux/windows.h diff --git a/fs/nfs/Makefile b/fs/nfs/Makefile index 2433c3e03cfa..20fbc9596833 100644 --- a/fs/nfs/Makefile +++ b/fs/nfs/Makefile @@ -13,6 +13,7 @@ nfs-y := client.o dir.o file.o getroot.o inode.o super.o \ nfs-$(CONFIG_ROOT_NFS) += nfsroot.o nfs-$(CONFIG_SYSCTL) += sysctl.o nfs-$(CONFIG_NFS_FSCACHE) += fscache.o fscache-index.o +nfs-$(CONFIG_FSINFO) += fsinfo.o obj-$(CONFIG_NFS_V2) += nfsv2.o nfsv2-y := nfs2super.o proc.o nfs2xdr.o diff --git a/fs/nfs/fsinfo.c b/fs/nfs/fsinfo.c new file mode 100644 index 000000000000..a0299ec27efd --- /dev/null +++ b/fs/nfs/fsinfo.c @@ -0,0 +1,230 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Filesystem information for NFS + * + * Copyright (C) 2020 Red Hat, Inc. All Rights Reserved. + * Written by David Howells (dhowells@redhat.com) + */ + +#include +#include +#include "internal.h" + +static const struct fsinfo_timestamp_info nfs_timestamp_info = { + .atime = { + .minimum = 0, + .maximum = UINT_MAX, + .gran_mantissa = 1, + .gran_exponent = 0, + }, + .mtime = { + .minimum = 0, + .maximum = UINT_MAX, + .gran_mantissa = 1, + .gran_exponent = 0, + }, + .ctime = { + .minimum = 0, + .maximum = UINT_MAX, + .gran_mantissa = 1, + .gran_exponent = 0, + }, + .btime = { + .minimum = 0, + .maximum = UINT_MAX, + .gran_mantissa = 1, + .gran_exponent = 0, + }, +}; + +static int nfs_fsinfo_get_timestamp_info(struct path *path, struct fsinfo_context *ctx) +{ + const struct nfs_server *server = NFS_SB(path->dentry->d_sb); + struct fsinfo_timestamp_info *r = ctx->buffer; + unsigned long long nsec; + unsigned int rem, mant; + int exp = -9; + + *r = nfs_timestamp_info; + + nsec = server->time_delta.tv_nsec; + nsec += server->time_delta.tv_sec * 1000000000ULL; + if (nsec == 0) + goto out; + + do { + mant = nsec; + rem = do_div(nsec, 10); + if (rem) + break; + exp++; + } while (nsec); + + r->atime.gran_mantissa = mant; + r->atime.gran_exponent = exp; + r->btime.gran_mantissa = mant; + r->btime.gran_exponent = exp; + r->ctime.gran_mantissa = mant; + r->ctime.gran_exponent = exp; + r->mtime.gran_mantissa = mant; + r->mtime.gran_exponent = exp; + +out: + return sizeof(*r); +} + +static int nfs_fsinfo_get_info(struct path *path, struct fsinfo_context *ctx) +{ + const struct nfs_server *server = NFS_SB(path->dentry->d_sb); + const struct nfs_client *clp = server->nfs_client; + struct fsinfo_nfs_info *r = ctx->buffer; + + r->version = clp->rpc_ops->version; + r->minor_version = clp->cl_minorversion; + r->transport_proto = clp->cl_proto; + return sizeof(*r); +} + +static int nfs_fsinfo_get_server_name(struct path *path, struct fsinfo_context *ctx) +{ + const struct nfs_server *server = NFS_SB(path->dentry->d_sb); + const struct nfs_client *clp = server->nfs_client; + + return fsinfo_string(clp->cl_hostname, ctx); +} + +static int nfs_fsinfo_get_server_addresses(struct path *path, struct fsinfo_context *ctx) +{ + const struct nfs_server *server = NFS_SB(path->dentry->d_sb); + const struct nfs_client *clp = server->nfs_client; + struct fsinfo_nfs_server_address *addr = ctx->buffer; + int ret; + + ret = 1 * sizeof(*addr); + if (ret <= ctx->buf_size) + memcpy(&addr[0].address, &clp->cl_addr, clp->cl_addrlen); + return ret; + +} + +static int nfs_fsinfo_get_gssapi_name(struct path *path, struct fsinfo_context *ctx) +{ + const struct nfs_server *server = NFS_SB(path->dentry->d_sb); + const struct nfs_client *clp = server->nfs_client; + + return fsinfo_string(clp->cl_acceptor, ctx); +} + +static int nfs_fsinfo_get_limits(struct path *path, struct fsinfo_context *ctx) +{ + const struct nfs_server *server = NFS_SB(path->dentry->d_sb); + struct fsinfo_limits *lim = ctx->buffer; + + lim->max_file_size.hi = 0; + lim->max_file_size.lo = server->maxfilesize; + lim->max_ino.hi = 0; + lim->max_ino.lo = U64_MAX; + lim->max_hard_links = UINT_MAX; + lim->max_uid = UINT_MAX; + lim->max_gid = UINT_MAX; + lim->max_filename_len = NAME_MAX - 1; + lim->max_symlink_len = PATH_MAX - 1; + return sizeof(*lim); +} + +static int nfs_fsinfo_get_supports(struct path *path, struct fsinfo_context *ctx) +{ + const struct nfs_server *server = NFS_SB(path->dentry->d_sb); + struct fsinfo_supports *sup = ctx->buffer; + + /* Don't set STATX_INO as i_ino is fabricated and may not be unique. */ + + if (!(server->caps & NFS_CAP_MODE)) + sup->stx_mask |= STATX_TYPE | STATX_MODE; + if (server->caps & NFS_CAP_OWNER) + sup->stx_mask |= STATX_UID; + if (server->caps & NFS_CAP_OWNER_GROUP) + sup->stx_mask |= STATX_GID; + if (server->caps & NFS_CAP_ATIME) + sup->stx_mask |= STATX_ATIME; + if (server->caps & NFS_CAP_CTIME) + sup->stx_mask |= STATX_CTIME; + if (server->caps & NFS_CAP_MTIME) + sup->stx_mask |= STATX_MTIME; + if (server->attr_bitmask[0] & FATTR4_WORD0_SIZE) + sup->stx_mask |= STATX_SIZE; + if (server->attr_bitmask[1] & FATTR4_WORD1_NUMLINKS) + sup->stx_mask |= STATX_NLINK; + + if (server->attr_bitmask[0] & FATTR4_WORD0_ARCHIVE) + sup->win_file_attrs |= ATTR_ARCHIVE; + if (server->attr_bitmask[0] & FATTR4_WORD0_HIDDEN) + sup->win_file_attrs |= ATTR_HIDDEN; + if (server->attr_bitmask[1] & FATTR4_WORD1_SYSTEM) + sup->win_file_attrs |= ATTR_SYSTEM; + + sup->stx_attributes = STATX_ATTR_AUTOMOUNT; + return sizeof(*sup); +} + +static int nfs_fsinfo_get_features(struct path *path, struct fsinfo_context *ctx) +{ + const struct nfs_server *server = NFS_SB(path->dentry->d_sb); + struct fsinfo_features *ft = ctx->buffer; + + fsinfo_set_feature(ft, FSINFO_FEAT_IS_NETWORK_FS); + fsinfo_set_feature(ft, FSINFO_FEAT_AUTOMOUNTS); + fsinfo_set_feature(ft, FSINFO_FEAT_O_SYNC); + fsinfo_set_feature(ft, FSINFO_FEAT_O_DIRECT); + fsinfo_set_feature(ft, FSINFO_FEAT_ADV_LOCKS); + fsinfo_set_feature(ft, FSINFO_FEAT_DEVICE_FILES); + fsinfo_set_feature(ft, FSINFO_FEAT_UNIX_SPECIALS); + if (server->nfs_client->rpc_ops->version == 4) { + fsinfo_set_feature(ft, FSINFO_FEAT_LEASES); + fsinfo_set_feature(ft, FSINFO_FEAT_IVER_ALL_CHANGE); + } + + if (server->caps & NFS_CAP_OWNER) + fsinfo_set_feature(ft, FSINFO_FEAT_UIDS); + if (server->caps & NFS_CAP_OWNER_GROUP) + fsinfo_set_feature(ft, FSINFO_FEAT_GIDS); + if (!(server->caps & NFS_CAP_MODE)) + fsinfo_set_feature(ft, FSINFO_FEAT_NO_UNIX_MODE); + if (server->caps & NFS_CAP_ACLS) + fsinfo_set_feature(ft, FSINFO_FEAT_HAS_ACL); + if (server->caps & NFS_CAP_SYMLINKS) + fsinfo_set_feature(ft, FSINFO_FEAT_SYMLINKS); + if (server->caps & NFS_CAP_HARDLINKS) + fsinfo_set_feature(ft, FSINFO_FEAT_HARD_LINKS); + if (server->caps & NFS_CAP_ATIME) + fsinfo_set_feature(ft, FSINFO_FEAT_HAS_ATIME); + if (server->caps & NFS_CAP_CTIME) + fsinfo_set_feature(ft, FSINFO_FEAT_HAS_CTIME); + if (server->caps & NFS_CAP_MTIME) + fsinfo_set_feature(ft, FSINFO_FEAT_HAS_MTIME); + + if (server->attr_bitmask[0] & FATTR4_WORD0_CASE_INSENSITIVE) + fsinfo_set_feature(ft, FSINFO_FEAT_NAME_CASE_INDEP); + if ((server->attr_bitmask[0] & FATTR4_WORD0_ARCHIVE) || + (server->attr_bitmask[0] & FATTR4_WORD0_HIDDEN) || + (server->attr_bitmask[1] & FATTR4_WORD1_SYSTEM)) + fsinfo_set_feature(ft, FSINFO_FEAT_WINDOWS_ATTRS); + + return sizeof(*ft); +} + +static const struct fsinfo_attribute nfs_fsinfo_attributes[] = { + FSINFO_VSTRUCT (FSINFO_ATTR_TIMESTAMP_INFO, nfs_fsinfo_get_timestamp_info), + FSINFO_VSTRUCT (FSINFO_ATTR_LIMITS, nfs_fsinfo_get_limits), + FSINFO_VSTRUCT (FSINFO_ATTR_SUPPORTS, nfs_fsinfo_get_supports), + FSINFO_VSTRUCT (FSINFO_ATTR_FEATURES, nfs_fsinfo_get_features), + FSINFO_VSTRUCT (FSINFO_ATTR_NFS_INFO, nfs_fsinfo_get_info), + FSINFO_STRING (FSINFO_ATTR_NFS_SERVER_NAME, nfs_fsinfo_get_server_name), + FSINFO_LIST (FSINFO_ATTR_NFS_SERVER_ADDRESSES, nfs_fsinfo_get_server_addresses), + FSINFO_STRING (FSINFO_ATTR_NFS_GSSAPI_NAME, nfs_fsinfo_get_gssapi_name), + {} +}; + +int nfs_fsinfo(struct path *path, struct fsinfo_context *ctx) +{ + return fsinfo_get_attribute(path, ctx, nfs_fsinfo_attributes); +} diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h index f80c47d5ff27..59e407066b45 100644 --- a/fs/nfs/internal.h +++ b/fs/nfs/internal.h @@ -10,6 +10,7 @@ #include #include #include +#include #define NFS_SB_MASK (SB_RDONLY|SB_NOSUID|SB_NODEV|SB_NOEXEC|SB_SYNCHRONOUS) @@ -247,6 +248,11 @@ extern const struct svc_version nfs4_callback_version4; /* fs_context.c */ extern struct file_system_type nfs_fs_type; +/* fsinfo.c */ +#ifdef CONFIG_FSINFO +extern int nfs_fsinfo(struct path *path, struct fsinfo_context *ctx); +#endif + /* pagelist.c */ extern int __init nfs_init_nfspagecache(void); extern void nfs_destroy_nfspagecache(void); diff --git a/fs/nfs/nfs4super.c b/fs/nfs/nfs4super.c index 1475f932d7da..cd38da87cbd3 100644 --- a/fs/nfs/nfs4super.c +++ b/fs/nfs/nfs4super.c @@ -26,6 +26,9 @@ static const struct super_operations nfs4_sops = { .write_inode = nfs4_write_inode, .drop_inode = nfs_drop_inode, .statfs = nfs_statfs, +#ifdef CONFIG_FSINFO + .fsinfo = nfs_fsinfo, +#endif .evict_inode = nfs4_evict_inode, .umount_begin = nfs_umount_begin, .show_options = nfs_show_options, diff --git a/fs/nfs/super.c b/fs/nfs/super.c index dada09b391c6..27ac751d3789 100644 --- a/fs/nfs/super.c +++ b/fs/nfs/super.c @@ -76,6 +76,9 @@ const struct super_operations nfs_sops = { .write_inode = nfs_write_inode, .drop_inode = nfs_drop_inode, .statfs = nfs_statfs, +#ifdef CONFIG_FSINFO + .fsinfo = nfs_fsinfo, +#endif .evict_inode = nfs_evict_inode, .umount_begin = nfs_umount_begin, .show_options = nfs_show_options, diff --git a/include/uapi/linux/fsinfo.h b/include/uapi/linux/fsinfo.h index 6a8a7a8e4910..d5c4fe681333 100644 --- a/include/uapi/linux/fsinfo.h +++ b/include/uapi/linux/fsinfo.h @@ -39,6 +39,11 @@ #define FSINFO_ATTR_EXT4_TIMESTAMPS 0x400 /* Ext4 superblock timestamps */ +#define FSINFO_ATTR_NFS_INFO 0x500 /* Information about an NFS mount */ +#define FSINFO_ATTR_NFS_SERVER_NAME 0x501 /* Name of the server (string) */ +#define FSINFO_ATTR_NFS_SERVER_ADDRESSES 0x502 /* List of addresses of the server */ +#define FSINFO_ATTR_NFS_GSSAPI_NAME 0x503 /* GSSAPI acceptor name */ + /* * Optional fsinfo() parameter structure. * @@ -329,4 +334,28 @@ struct fsinfo_ext4_timestamps { #define FSINFO_ATTR_EXT4_TIMESTAMPS__STRUCT struct fsinfo_ext4_timestamps +/* + * Information struct for fsinfo(FSINFO_ATTR_NFS_INFO). + * + * Get information about an NFS mount. + */ +struct fsinfo_nfs_info { + __u32 version; + __u32 minor_version; + __u32 transport_proto; +}; + +#define FSINFO_ATTR_NFS_INFO__STRUCT struct fsinfo_nfs_info + +/* + * Information struct for fsinfo(FSINFO_ATTR_NFS_SERVER_ADDRESSES). + * + * Get the addresses of the server for an NFS mount. + */ +struct fsinfo_nfs_server_address { + struct __kernel_sockaddr_storage address; +}; + +#define FSINFO_ATTR_NFS_SERVER_ADDRESSES__STRUCT struct fsinfo_nfs_server_address + #endif /* _UAPI_LINUX_FSINFO_H */ diff --git a/include/uapi/linux/windows.h b/include/uapi/linux/windows.h new file mode 100644 index 000000000000..17efb9a40529 --- /dev/null +++ b/include/uapi/linux/windows.h @@ -0,0 +1,35 @@ +/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ +/* + * Common windows attributes + */ +#ifndef _UAPI_LINUX_WINDOWS_H +#define _UAPI_LINUX_WINDOWS_H + +/* + * File Attribute flags + */ +#define ATTR_READONLY 0x0001 +#define ATTR_HIDDEN 0x0002 +#define ATTR_SYSTEM 0x0004 +#define ATTR_VOLUME 0x0008 +#define ATTR_DIRECTORY 0x0010 +#define ATTR_ARCHIVE 0x0020 +#define ATTR_DEVICE 0x0040 +#define ATTR_NORMAL 0x0080 +#define ATTR_TEMPORARY 0x0100 +#define ATTR_SPARSE 0x0200 +#define ATTR_REPARSE 0x0400 +#define ATTR_COMPRESSED 0x0800 +#define ATTR_OFFLINE 0x1000 /* ie file not immediately available - + on offline storage */ +#define ATTR_NOT_CONTENT_INDEXED 0x2000 +#define ATTR_ENCRYPTED 0x4000 +#define ATTR_POSIX_SEMANTICS 0x01000000 +#define ATTR_BACKUP_SEMANTICS 0x02000000 +#define ATTR_DELETE_ON_CLOSE 0x04000000 +#define ATTR_SEQUENTIAL_SCAN 0x08000000 +#define ATTR_RANDOM_ACCESS 0x10000000 +#define ATTR_NO_BUFFERING 0x20000000 +#define ATTR_WRITE_THROUGH 0x80000000 + +#endif /* _UAPI_LINUX_WINDOWS_H */ diff --git a/samples/vfs/test-fsinfo.c b/samples/vfs/test-fsinfo.c index df8d2449fc22..87239f0b6a50 100644 --- a/samples/vfs/test-fsinfo.c +++ b/samples/vfs/test-fsinfo.c @@ -391,6 +391,40 @@ static void dump_ext4_fsinfo_timestamps(void *reply, unsigned int size) printf("\tlast-err: %s\n", dump_ext4_time(buffer, r->last_error_time)); } +static void dump_nfs_fsinfo_info(void *reply, unsigned int size) +{ + struct fsinfo_nfs_info *r = reply; + + printf("ver=%u.%u proto=%u\n", r->version, r->minor_version, r->transport_proto); +} + +static void dump_nfs_fsinfo_server_addresses(void *reply, unsigned int size) +{ + struct fsinfo_nfs_server_address *r = reply; + struct sockaddr_storage *ss = (struct sockaddr_storage *)&r->address; + struct sockaddr_in6 *sin6; + struct sockaddr_in *sin; + char buf[1024]; + + switch (ss->ss_family) { + case AF_INET: + sin = (struct sockaddr_in *)ss; + if (!inet_ntop(AF_INET, &sin->sin_addr, buf, sizeof(buf))) + break; + printf("%5u %s\n", ntohs(sin->sin_port), buf); + return; + case AF_INET6: + sin6 = (struct sockaddr_in6 *)ss; + if (!inet_ntop(AF_INET6, &sin6->sin6_addr, buf, sizeof(buf))) + break; + printf("%5u %s\n", ntohs(sin6->sin6_port), buf); + return; + default: + printf("family=%u\n", ss->ss_family); + return; + } +} + static void dump_string(void *reply, unsigned int size) { char *s = reply, *p; @@ -422,6 +456,8 @@ static void dump_string(void *reply, unsigned int size) #define dump_fsinfo_generic_mount_point dump_string #define dump_afs_cell_name dump_string #define dump_afs_server_name dump_string +#define dump_nfs_fsinfo_server_name dump_string +#define dump_nfs_fsinfo_gssapi_name dump_string /* * @@ -468,6 +504,10 @@ static const struct fsinfo_attribute fsinfo_attributes[] = { FSINFO_STRING (FSINFO_ATTR_AFS_SERVER_NAME, afs_server_name), FSINFO_LIST_N (FSINFO_ATTR_AFS_SERVER_ADDRESSES, afs_fsinfo_server_address), FSINFO_VSTRUCT (FSINFO_ATTR_EXT4_TIMESTAMPS, ext4_fsinfo_timestamps), + FSINFO_VSTRUCT (FSINFO_ATTR_NFS_INFO, nfs_fsinfo_info), + FSINFO_STRING (FSINFO_ATTR_NFS_SERVER_NAME, nfs_fsinfo_server_name), + FSINFO_LIST (FSINFO_ATTR_NFS_SERVER_ADDRESSES, nfs_fsinfo_server_addresses), + FSINFO_STRING (FSINFO_ATTR_NFS_GSSAPI_NAME, nfs_fsinfo_gssapi_name), {} };