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c21fd7a8e8
RQ_SPLICE_OK is a bit of a layering violation. Also, a subsequent patch is going to provide a mechanism for always disabling splice reads. Splicing is an issue only for NFS READs, so refactor nfsd_read() to check the auth type directly instead of relying on an rq_flag setting. The new helper will be added into the NFSv4 read path in a subsequent patch. Reviewed-by: Jeff Layton <jlayton@kernel.org> Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
185 lines
6.2 KiB
C
185 lines
6.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 1995-1997 Olaf Kirch <okir@monad.swb.de>
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*/
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#ifndef LINUX_NFSD_VFS_H
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#define LINUX_NFSD_VFS_H
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#include <linux/fs.h>
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#include <linux/posix_acl.h>
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#include "nfsfh.h"
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#include "nfsd.h"
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/*
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* Flags for nfsd_permission
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*/
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#define NFSD_MAY_NOP 0
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#define NFSD_MAY_EXEC 0x001 /* == MAY_EXEC */
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#define NFSD_MAY_WRITE 0x002 /* == MAY_WRITE */
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#define NFSD_MAY_READ 0x004 /* == MAY_READ */
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#define NFSD_MAY_SATTR 0x008
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#define NFSD_MAY_TRUNC 0x010
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#define NFSD_MAY_LOCK 0x020
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#define NFSD_MAY_MASK 0x03f
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/* extra hints to permission and open routines: */
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#define NFSD_MAY_OWNER_OVERRIDE 0x040
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#define NFSD_MAY_LOCAL_ACCESS 0x080 /* for device special files */
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#define NFSD_MAY_BYPASS_GSS_ON_ROOT 0x100
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#define NFSD_MAY_NOT_BREAK_LEASE 0x200
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#define NFSD_MAY_BYPASS_GSS 0x400
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#define NFSD_MAY_READ_IF_EXEC 0x800
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#define NFSD_MAY_64BIT_COOKIE 0x1000 /* 64 bit readdir cookies for >= NFSv3 */
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#define NFSD_MAY_CREATE (NFSD_MAY_EXEC|NFSD_MAY_WRITE)
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#define NFSD_MAY_REMOVE (NFSD_MAY_EXEC|NFSD_MAY_WRITE|NFSD_MAY_TRUNC)
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struct nfsd_file;
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/*
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* Callback function for readdir
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*/
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typedef int (*nfsd_filldir_t)(void *, const char *, int, loff_t, u64, unsigned);
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/* nfsd/vfs.c */
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struct nfsd_attrs {
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struct iattr *na_iattr; /* input */
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struct xdr_netobj *na_seclabel; /* input */
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struct posix_acl *na_pacl; /* input */
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struct posix_acl *na_dpacl; /* input */
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int na_labelerr; /* output */
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int na_aclerr; /* output */
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};
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static inline void nfsd_attrs_free(struct nfsd_attrs *attrs)
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{
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posix_acl_release(attrs->na_pacl);
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posix_acl_release(attrs->na_dpacl);
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}
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__be32 nfserrno (int errno);
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int nfsd_cross_mnt(struct svc_rqst *rqstp, struct dentry **dpp,
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struct svc_export **expp);
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__be32 nfsd_lookup(struct svc_rqst *, struct svc_fh *,
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const char *, unsigned int, struct svc_fh *);
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__be32 nfsd_lookup_dentry(struct svc_rqst *, struct svc_fh *,
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const char *, unsigned int,
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struct svc_export **, struct dentry **);
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__be32 nfsd_setattr(struct svc_rqst *, struct svc_fh *,
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struct nfsd_attrs *, int, time64_t);
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int nfsd_mountpoint(struct dentry *, struct svc_export *);
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#ifdef CONFIG_NFSD_V4
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__be32 nfsd4_vfs_fallocate(struct svc_rqst *, struct svc_fh *,
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struct file *, loff_t, loff_t, int);
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__be32 nfsd4_clone_file_range(struct svc_rqst *rqstp,
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struct nfsd_file *nf_src, u64 src_pos,
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struct nfsd_file *nf_dst, u64 dst_pos,
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u64 count, bool sync);
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#endif /* CONFIG_NFSD_V4 */
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__be32 nfsd_create_locked(struct svc_rqst *, struct svc_fh *,
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struct nfsd_attrs *attrs, int type, dev_t rdev,
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struct svc_fh *res);
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__be32 nfsd_create(struct svc_rqst *, struct svc_fh *,
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char *name, int len, struct nfsd_attrs *attrs,
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int type, dev_t rdev, struct svc_fh *res);
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__be32 nfsd_access(struct svc_rqst *, struct svc_fh *, u32 *, u32 *);
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__be32 nfsd_create_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp,
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struct svc_fh *resfhp, struct nfsd_attrs *iap);
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__be32 nfsd_commit(struct svc_rqst *rqst, struct svc_fh *fhp,
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struct nfsd_file *nf, u64 offset, u32 count,
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__be32 *verf);
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#ifdef CONFIG_NFSD_V4
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__be32 nfsd_getxattr(struct svc_rqst *rqstp, struct svc_fh *fhp,
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char *name, void **bufp, int *lenp);
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__be32 nfsd_listxattr(struct svc_rqst *rqstp, struct svc_fh *fhp,
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char **bufp, int *lenp);
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__be32 nfsd_removexattr(struct svc_rqst *rqstp, struct svc_fh *fhp,
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char *name);
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__be32 nfsd_setxattr(struct svc_rqst *rqstp, struct svc_fh *fhp,
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char *name, void *buf, u32 len, u32 flags);
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#endif
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int nfsd_open_break_lease(struct inode *, int);
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__be32 nfsd_open(struct svc_rqst *, struct svc_fh *, umode_t,
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int, struct file **);
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int nfsd_open_verified(struct svc_rqst *rqstp, struct svc_fh *fhp,
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int may_flags, struct file **filp);
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__be32 nfsd_splice_read(struct svc_rqst *rqstp, struct svc_fh *fhp,
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struct file *file, loff_t offset,
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unsigned long *count,
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u32 *eof);
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__be32 nfsd_iter_read(struct svc_rqst *rqstp, struct svc_fh *fhp,
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struct file *file, loff_t offset,
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unsigned long *count, unsigned int base,
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u32 *eof);
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bool nfsd_read_splice_ok(struct svc_rqst *rqstp);
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__be32 nfsd_read(struct svc_rqst *rqstp, struct svc_fh *fhp,
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loff_t offset, unsigned long *count,
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u32 *eof);
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__be32 nfsd_write(struct svc_rqst *, struct svc_fh *, loff_t,
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struct kvec *, int, unsigned long *,
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int stable, __be32 *verf);
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__be32 nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp,
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struct nfsd_file *nf, loff_t offset,
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struct kvec *vec, int vlen, unsigned long *cnt,
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int stable, __be32 *verf);
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__be32 nfsd_readlink(struct svc_rqst *, struct svc_fh *,
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char *, int *);
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__be32 nfsd_symlink(struct svc_rqst *, struct svc_fh *,
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char *name, int len, char *path,
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struct nfsd_attrs *attrs,
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struct svc_fh *res);
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__be32 nfsd_link(struct svc_rqst *, struct svc_fh *,
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char *, int, struct svc_fh *);
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ssize_t nfsd_copy_file_range(struct file *, u64,
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struct file *, u64, u64);
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__be32 nfsd_rename(struct svc_rqst *,
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struct svc_fh *, char *, int,
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struct svc_fh *, char *, int);
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__be32 nfsd_unlink(struct svc_rqst *, struct svc_fh *, int type,
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char *name, int len);
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__be32 nfsd_readdir(struct svc_rqst *, struct svc_fh *,
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loff_t *, struct readdir_cd *, nfsd_filldir_t);
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__be32 nfsd_statfs(struct svc_rqst *, struct svc_fh *,
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struct kstatfs *, int access);
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__be32 nfsd_permission(struct svc_rqst *, struct svc_export *,
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struct dentry *, int);
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static inline int fh_want_write(struct svc_fh *fh)
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{
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int ret;
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if (fh->fh_want_write)
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return 0;
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ret = mnt_want_write(fh->fh_export->ex_path.mnt);
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if (!ret)
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fh->fh_want_write = true;
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return ret;
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}
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static inline void fh_drop_write(struct svc_fh *fh)
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{
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if (fh->fh_want_write) {
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fh->fh_want_write = false;
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mnt_drop_write(fh->fh_export->ex_path.mnt);
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}
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}
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static inline __be32 fh_getattr(const struct svc_fh *fh, struct kstat *stat)
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{
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u32 request_mask = STATX_BASIC_STATS;
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struct path p = {.mnt = fh->fh_export->ex_path.mnt,
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.dentry = fh->fh_dentry};
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if (fh->fh_maxsize == NFS4_FHSIZE)
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request_mask |= (STATX_BTIME | STATX_CHANGE_COOKIE);
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return nfserrno(vfs_getattr(&p, stat, request_mask,
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AT_STATX_SYNC_AS_STAT));
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}
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#endif /* LINUX_NFSD_VFS_H */
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