nfsd: support ext4 i_version
ext4 supports a real NFSv4 change attribute, which is bumped whenever the ctime would be updated, including times when two updates arrive within a jiffy of each other. (Note that although ext4 has space for nanosecond-precision ctime, the real resolution is lower: it actually uses jiffies as the time-source.) This ensures clients will invalidate their caches when they need to. There is some fear that keeping the i_version up-to-date could have performance drawbacks, so for now it's turned on only by a mount option. We hope to do something better eventually. Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu> Cc: Theodore Tso <tytso@mit.edu>
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@ -272,6 +272,7 @@ void fill_post_wcc(struct svc_fh *fhp)
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err = vfs_getattr(fhp->fh_export->ex_path.mnt, fhp->fh_dentry,
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&fhp->fh_post_attr);
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fhp->fh_post_change = fhp->fh_dentry->d_inode->i_version;
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if (err)
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fhp->fh_post_saved = 0;
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else
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@ -1490,13 +1490,41 @@ nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
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memcpy(p, ptr, nbytes); \
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p += XDR_QUADLEN(nbytes); \
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}} while (0)
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#define WRITECINFO(c) do { \
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*p++ = htonl(c.atomic); \
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*p++ = htonl(c.before_ctime_sec); \
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*p++ = htonl(c.before_ctime_nsec); \
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*p++ = htonl(c.after_ctime_sec); \
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*p++ = htonl(c.after_ctime_nsec); \
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} while (0)
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static void write32(__be32 **p, u32 n)
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{
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*(*p)++ = n;
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}
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static void write64(__be32 **p, u64 n)
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{
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write32(p, (u32)(n >> 32));
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write32(p, (u32)n);
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}
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static void write_change(__be32 **p, struct kstat *stat, struct inode *inode)
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{
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if (IS_I_VERSION(inode)) {
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write64(p, inode->i_version);
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} else {
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write32(p, stat->ctime.tv_sec);
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write32(p, stat->ctime.tv_nsec);
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}
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}
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static void write_cinfo(__be32 **p, struct nfsd4_change_info *c)
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{
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write32(p, c->atomic);
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if (c->change_supported) {
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write64(p, c->before_change);
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write64(p, c->after_change);
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} else {
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write32(p, c->before_ctime_sec);
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write32(p, c->before_ctime_nsec);
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write32(p, c->after_ctime_sec);
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write32(p, c->after_ctime_nsec);
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}
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}
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#define RESERVE_SPACE(nbytes) do { \
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p = resp->p; \
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@ -1849,16 +1877,9 @@ nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
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WRITE32(NFS4_FH_PERSISTENT|NFS4_FH_VOL_RENAME);
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}
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if (bmval0 & FATTR4_WORD0_CHANGE) {
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/*
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* Note: This _must_ be consistent with the scheme for writing
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* change_info, so any changes made here must be reflected there
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* as well. (See xdr4.h:set_change_info() and the WRITECINFO()
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* macro above.)
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*/
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if ((buflen -= 8) < 0)
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goto out_resource;
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WRITE32(stat.ctime.tv_sec);
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WRITE32(stat.ctime.tv_nsec);
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write_change(&p, &stat, dentry->d_inode);
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}
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if (bmval0 & FATTR4_WORD0_SIZE) {
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if ((buflen -= 8) < 0)
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@ -2364,7 +2385,7 @@ nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_
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if (!nfserr) {
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RESERVE_SPACE(32);
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WRITECINFO(create->cr_cinfo);
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write_cinfo(&p, &create->cr_cinfo);
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WRITE32(2);
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WRITE32(create->cr_bmval[0]);
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WRITE32(create->cr_bmval[1]);
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@ -2475,7 +2496,7 @@ nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_li
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if (!nfserr) {
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RESERVE_SPACE(20);
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WRITECINFO(link->li_cinfo);
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write_cinfo(&p, &link->li_cinfo);
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ADJUST_ARGS();
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}
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return nfserr;
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@ -2493,7 +2514,7 @@ nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_op
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nfsd4_encode_stateid(resp, &open->op_stateid);
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RESERVE_SPACE(40);
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WRITECINFO(open->op_cinfo);
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write_cinfo(&p, &open->op_cinfo);
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WRITE32(open->op_rflags);
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WRITE32(2);
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WRITE32(open->op_bmval[0]);
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@ -2771,7 +2792,7 @@ nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_
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if (!nfserr) {
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RESERVE_SPACE(20);
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WRITECINFO(remove->rm_cinfo);
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write_cinfo(&p, &remove->rm_cinfo);
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ADJUST_ARGS();
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}
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return nfserr;
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@ -2784,8 +2805,8 @@ nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_
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if (!nfserr) {
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RESERVE_SPACE(40);
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WRITECINFO(rename->rn_sinfo);
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WRITECINFO(rename->rn_tinfo);
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write_cinfo(&p, &rename->rn_sinfo);
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write_cinfo(&p, &rename->rn_tinfo);
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ADJUST_ARGS();
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}
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return nfserr;
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@ -151,9 +151,15 @@ typedef struct svc_fh {
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__u64 fh_pre_size; /* size before operation */
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struct timespec fh_pre_mtime; /* mtime before oper */
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struct timespec 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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@ -298,6 +304,7 @@ fill_pre_wcc(struct svc_fh *fhp)
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fhp->fh_pre_mtime = inode->i_mtime;
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fhp->fh_pre_ctime = inode->i_ctime;
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fhp->fh_pre_size = inode->i_size;
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fhp->fh_pre_change = inode->i_version;
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fhp->fh_pre_saved = 1;
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}
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}
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@ -64,10 +64,13 @@ static inline bool nfsd4_has_session(struct nfsd4_compound_state *cs)
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struct nfsd4_change_info {
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u32 atomic;
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bool change_supported;
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u32 before_ctime_sec;
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u32 before_ctime_nsec;
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u64 before_change;
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u32 after_ctime_sec;
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u32 after_ctime_nsec;
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u64 after_change;
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};
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struct nfsd4_access {
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@ -503,10 +506,16 @@ set_change_info(struct nfsd4_change_info *cinfo, struct svc_fh *fhp)
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{
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BUG_ON(!fhp->fh_pre_saved || !fhp->fh_post_saved);
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cinfo->atomic = 1;
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cinfo->before_ctime_sec = fhp->fh_pre_ctime.tv_sec;
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cinfo->before_ctime_nsec = fhp->fh_pre_ctime.tv_nsec;
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cinfo->after_ctime_sec = fhp->fh_post_attr.ctime.tv_sec;
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cinfo->after_ctime_nsec = fhp->fh_post_attr.ctime.tv_nsec;
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cinfo->change_supported = IS_I_VERSION(fhp->fh_dentry->d_inode);
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if (cinfo->change_supported) {
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cinfo->before_change = fhp->fh_pre_change;
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cinfo->after_change = fhp->fh_post_change;
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} else {
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cinfo->before_ctime_sec = fhp->fh_pre_ctime.tv_sec;
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cinfo->before_ctime_nsec = fhp->fh_pre_ctime.tv_nsec;
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cinfo->after_ctime_sec = fhp->fh_post_attr.ctime.tv_sec;
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cinfo->after_ctime_nsec = fhp->fh_post_attr.ctime.tv_nsec;
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}
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}
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int nfs4svc_encode_voidres(struct svc_rqst *, __be32 *, void *);
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