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337 lines
8.0 KiB
337 lines
8.0 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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/* |
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* Copyright (C) 1995, 1996, 1997 Olaf Kirch <[email protected]> |
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* |
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* This file describes the layout of the file handles as passed |
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* over the wire. |
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*/ |
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#ifndef _LINUX_NFSD_NFSFH_H |
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#define _LINUX_NFSD_NFSFH_H |
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#include <linux/crc32.h> |
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#include <linux/sunrpc/svc.h> |
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#include <uapi/linux/nfsd/nfsfh.h> |
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#include <linux/iversion.h> |
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#include <linux/exportfs.h> |
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static inline __u32 ino_t_to_u32(ino_t ino) |
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{ |
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return (__u32) ino; |
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} |
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static inline ino_t u32_to_ino_t(__u32 uino) |
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{ |
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return (ino_t) uino; |
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} |
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/* |
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* This is the internal representation of an NFS handle used in knfsd. |
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* pre_mtime/post_version will be used to support wcc_attr's in NFSv3. |
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*/ |
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typedef struct svc_fh { |
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struct knfsd_fh fh_handle; /* FH data */ |
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int fh_maxsize; /* max size for fh_handle */ |
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struct dentry * fh_dentry; /* validated dentry */ |
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struct svc_export * fh_export; /* export pointer */ |
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bool fh_locked; /* inode locked by us */ |
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bool fh_want_write; /* remount protection taken */ |
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bool fh_no_wcc; /* no wcc data needed */ |
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bool fh_no_atomic_attr; |
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/* |
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* wcc data is not atomic with |
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* operation |
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*/ |
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int fh_flags; /* FH flags */ |
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#ifdef CONFIG_NFSD_V3 |
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bool fh_post_saved; /* post-op attrs saved */ |
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bool fh_pre_saved; /* pre-op attrs saved */ |
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/* Pre-op attributes saved during fh_lock */ |
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__u64 fh_pre_size; /* size before operation */ |
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struct timespec64 fh_pre_mtime; /* mtime before oper */ |
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struct timespec64 fh_pre_ctime; /* ctime before oper */ |
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/* |
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* pre-op nfsv4 change attr: note must check IS_I_VERSION(inode) |
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* to find out if it is valid. |
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*/ |
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u64 fh_pre_change; |
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/* Post-op attributes saved in fh_unlock */ |
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struct kstat fh_post_attr; /* full attrs after operation */ |
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u64 fh_post_change; /* nfsv4 change; see above */ |
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#endif /* CONFIG_NFSD_V3 */ |
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} svc_fh; |
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#define NFSD4_FH_FOREIGN (1<<0) |
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#define SET_FH_FLAG(c, f) ((c)->fh_flags |= (f)) |
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#define HAS_FH_FLAG(c, f) ((c)->fh_flags & (f)) |
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enum nfsd_fsid { |
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FSID_DEV = 0, |
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FSID_NUM, |
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FSID_MAJOR_MINOR, |
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FSID_ENCODE_DEV, |
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FSID_UUID4_INUM, |
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FSID_UUID8, |
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FSID_UUID16, |
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FSID_UUID16_INUM, |
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}; |
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enum fsid_source { |
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FSIDSOURCE_DEV, |
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FSIDSOURCE_FSID, |
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FSIDSOURCE_UUID, |
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}; |
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extern enum fsid_source fsid_source(struct svc_fh *fhp); |
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/* |
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* This might look a little large to "inline" but in all calls except |
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* one, 'vers' is constant so moste of the function disappears. |
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* |
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* In some cases the values are considered to be host endian and in |
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* others, net endian. fsidv is always considered to be u32 as the |
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* callers don't know which it will be. So we must use __force to keep |
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* sparse from complaining. Since these values are opaque to the |
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* client, that shouldn't be a problem. |
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*/ |
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static inline void mk_fsid(int vers, u32 *fsidv, dev_t dev, ino_t ino, |
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u32 fsid, unsigned char *uuid) |
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{ |
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u32 *up; |
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switch(vers) { |
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case FSID_DEV: |
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fsidv[0] = (__force __u32)htonl((MAJOR(dev)<<16) | |
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MINOR(dev)); |
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fsidv[1] = ino_t_to_u32(ino); |
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break; |
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case FSID_NUM: |
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fsidv[0] = fsid; |
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break; |
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case FSID_MAJOR_MINOR: |
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fsidv[0] = (__force __u32)htonl(MAJOR(dev)); |
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fsidv[1] = (__force __u32)htonl(MINOR(dev)); |
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fsidv[2] = ino_t_to_u32(ino); |
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break; |
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case FSID_ENCODE_DEV: |
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fsidv[0] = new_encode_dev(dev); |
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fsidv[1] = ino_t_to_u32(ino); |
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break; |
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case FSID_UUID4_INUM: |
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/* 4 byte fsid and inode number */ |
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up = (u32*)uuid; |
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fsidv[0] = ino_t_to_u32(ino); |
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fsidv[1] = up[0] ^ up[1] ^ up[2] ^ up[3]; |
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break; |
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case FSID_UUID8: |
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/* 8 byte fsid */ |
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up = (u32*)uuid; |
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fsidv[0] = up[0] ^ up[2]; |
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fsidv[1] = up[1] ^ up[3]; |
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break; |
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case FSID_UUID16: |
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/* 16 byte fsid - NFSv3+ only */ |
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memcpy(fsidv, uuid, 16); |
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break; |
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case FSID_UUID16_INUM: |
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/* 8 byte inode and 16 byte fsid */ |
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*(u64*)fsidv = (u64)ino; |
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memcpy(fsidv+2, uuid, 16); |
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break; |
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default: BUG(); |
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} |
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} |
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static inline int key_len(int type) |
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{ |
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switch(type) { |
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case FSID_DEV: return 8; |
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case FSID_NUM: return 4; |
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case FSID_MAJOR_MINOR: return 12; |
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case FSID_ENCODE_DEV: return 8; |
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case FSID_UUID4_INUM: return 8; |
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case FSID_UUID8: return 8; |
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case FSID_UUID16: return 16; |
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case FSID_UUID16_INUM: return 24; |
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default: return 0; |
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} |
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} |
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/* |
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* Shorthand for dprintk()'s |
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*/ |
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extern char * SVCFH_fmt(struct svc_fh *fhp); |
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/* |
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* Function prototypes |
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*/ |
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__be32 fh_verify(struct svc_rqst *, struct svc_fh *, umode_t, int); |
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__be32 fh_compose(struct svc_fh *, struct svc_export *, struct dentry *, struct svc_fh *); |
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__be32 fh_update(struct svc_fh *); |
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void fh_put(struct svc_fh *); |
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static __inline__ struct svc_fh * |
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fh_copy(struct svc_fh *dst, struct svc_fh *src) |
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{ |
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WARN_ON(src->fh_dentry || src->fh_locked); |
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*dst = *src; |
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return dst; |
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} |
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static inline void |
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fh_copy_shallow(struct knfsd_fh *dst, struct knfsd_fh *src) |
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{ |
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dst->fh_size = src->fh_size; |
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memcpy(&dst->fh_base, &src->fh_base, src->fh_size); |
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} |
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static __inline__ struct svc_fh * |
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fh_init(struct svc_fh *fhp, int maxsize) |
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{ |
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memset(fhp, 0, sizeof(*fhp)); |
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fhp->fh_maxsize = maxsize; |
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return fhp; |
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} |
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static inline bool fh_match(struct knfsd_fh *fh1, struct knfsd_fh *fh2) |
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{ |
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if (fh1->fh_size != fh2->fh_size) |
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return false; |
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if (memcmp(fh1->fh_base.fh_pad, fh2->fh_base.fh_pad, fh1->fh_size) != 0) |
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return false; |
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return true; |
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} |
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static inline bool fh_fsid_match(struct knfsd_fh *fh1, struct knfsd_fh *fh2) |
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{ |
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if (fh1->fh_fsid_type != fh2->fh_fsid_type) |
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return false; |
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if (memcmp(fh1->fh_fsid, fh2->fh_fsid, key_len(fh1->fh_fsid_type)) != 0) |
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return false; |
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return true; |
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} |
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#ifdef CONFIG_CRC32 |
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/** |
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* knfsd_fh_hash - calculate the crc32 hash for the filehandle |
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* @fh - pointer to filehandle |
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* |
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* returns a crc32 hash for the filehandle that is compatible with |
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* the one displayed by "wireshark". |
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*/ |
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static inline u32 |
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knfsd_fh_hash(struct knfsd_fh *fh) |
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{ |
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return ~crc32_le(0xFFFFFFFF, (unsigned char *)&fh->fh_base, fh->fh_size); |
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} |
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#else |
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static inline u32 |
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knfsd_fh_hash(struct knfsd_fh *fh) |
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{ |
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return 0; |
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} |
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#endif |
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#ifdef CONFIG_NFSD_V3 |
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/* |
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* The wcc data stored in current_fh should be cleared |
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* between compound ops. |
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*/ |
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static inline void |
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fh_clear_wcc(struct svc_fh *fhp) |
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{ |
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fhp->fh_post_saved = false; |
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fhp->fh_pre_saved = false; |
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} |
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/* |
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* We could use i_version alone as the change attribute. However, |
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* i_version can go backwards after a reboot. On its own that doesn't |
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* necessarily cause a problem, but if i_version goes backwards and then |
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* is incremented again it could reuse a value that was previously used |
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* before boot, and a client who queried the two values might |
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* incorrectly assume nothing changed. |
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* |
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* By using both ctime and the i_version counter we guarantee that as |
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* long as time doesn't go backwards we never reuse an old value. |
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*/ |
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static inline u64 nfsd4_change_attribute(struct kstat *stat, |
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struct inode *inode) |
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{ |
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if (inode->i_sb->s_export_op->fetch_iversion) |
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return inode->i_sb->s_export_op->fetch_iversion(inode); |
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else if (IS_I_VERSION(inode)) { |
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u64 chattr; |
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chattr = stat->ctime.tv_sec; |
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chattr <<= 30; |
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chattr += stat->ctime.tv_nsec; |
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chattr += inode_query_iversion(inode); |
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return chattr; |
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} else |
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return time_to_chattr(&stat->ctime); |
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} |
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extern void fill_pre_wcc(struct svc_fh *fhp); |
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extern void fill_post_wcc(struct svc_fh *fhp); |
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#else |
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#define fh_clear_wcc(ignored) |
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#define fill_pre_wcc(ignored) |
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#define fill_post_wcc(notused) |
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#endif /* CONFIG_NFSD_V3 */ |
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/* |
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* Lock a file handle/inode |
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* NOTE: both fh_lock and fh_unlock are done "by hand" in |
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* vfs.c:nfsd_rename as it needs to grab 2 i_mutex's at once |
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* so, any changes here should be reflected there. |
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*/ |
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static inline void |
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fh_lock_nested(struct svc_fh *fhp, unsigned int subclass) |
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{ |
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struct dentry *dentry = fhp->fh_dentry; |
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struct inode *inode; |
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BUG_ON(!dentry); |
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if (fhp->fh_locked) { |
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printk(KERN_WARNING "fh_lock: %pd2 already locked!\n", |
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dentry); |
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return; |
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} |
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inode = d_inode(dentry); |
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inode_lock_nested(inode, subclass); |
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fill_pre_wcc(fhp); |
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fhp->fh_locked = true; |
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} |
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static inline void |
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fh_lock(struct svc_fh *fhp) |
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{ |
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fh_lock_nested(fhp, I_MUTEX_NORMAL); |
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} |
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/* |
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* Unlock a file handle/inode |
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*/ |
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static inline void |
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fh_unlock(struct svc_fh *fhp) |
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{ |
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if (fhp->fh_locked) { |
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fill_post_wcc(fhp); |
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inode_unlock(d_inode(fhp->fh_dentry)); |
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fhp->fh_locked = false; |
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} |
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} |
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#endif /* _LINUX_NFSD_NFSFH_H */
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