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authorChristoph Hellwig <hch@lst.de>2014-05-05 13:11:59 +0200
committerChristoph Hellwig <hch@lst.de>2015-02-02 18:09:42 +0100
commit9cf514ccfacb301f3b1b4509a8ce25dffad55880 (patch)
tree2d78e2ad865bfc77c910b100c1fadab8f5004def /fs/nfsd/xdr4.h
parentnfsd: make find_any_file available outside nfs4state.c (diff)
downloadlinux-9cf514ccfacb301f3b1b4509a8ce25dffad55880.tar.xz
linux-9cf514ccfacb301f3b1b4509a8ce25dffad55880.zip
nfsd: implement pNFS operations
Add support for the GETDEVICEINFO, LAYOUTGET, LAYOUTCOMMIT and LAYOUTRETURN NFSv4.1 operations, as well as backing code to manage outstanding layouts and devices. Layout management is very straight forward, with a nfs4_layout_stateid structure that extends nfs4_stid to manage layout stateids as the top-level structure. It is linked into the nfs4_file and nfs4_client structures like the other stateids, and contains a linked list of layouts that hang of the stateid. The actual layout operations are implemented in layout drivers that are not part of this commit, but will be added later. The worst part of this commit is the management of the pNFS device IDs, which suffers from a specification that is not sanely implementable due to the fact that the device-IDs are global and not bound to an export, and have a small enough size so that we can't store the fsid portion of a file handle, and must never be reused. As we still do need perform all export authentication and validation checks on a device ID passed to GETDEVICEINFO we are caught between a rock and a hard place. To work around this issue we add a new hash that maps from a 64-bit integer to a fsid so that we can look up the export to authenticate against it, a 32-bit integer as a generation that we can bump when changing the device, and a currently unused 32-bit integer that could be used in the future to handle more than a single device per export. Entries in this hash table are never deleted as we can't reuse the ids anyway, and would have a severe lifetime problem anyway as Linux export structures are temporary structures that can go away under load. Parts of the XDR data, structures and marshaling/unmarshaling code, as well as many concepts are derived from the old pNFS server implementation from Andy Adamson, Benny Halevy, Dean Hildebrand, Marc Eshel, Fred Isaman, Mike Sager, Ricardo Labiaga and many others. Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'fs/nfsd/xdr4.h')
-rw-r--r--fs/nfsd/xdr4.h59
1 files changed, 59 insertions, 0 deletions
diff --git a/fs/nfsd/xdr4.h b/fs/nfsd/xdr4.h
index 90a5925bd6ab..0bda93e58e1b 100644
--- a/fs/nfsd/xdr4.h
+++ b/fs/nfsd/xdr4.h
@@ -428,6 +428,61 @@ struct nfsd4_reclaim_complete {
u32 rca_one_fs;
};
+struct nfsd4_deviceid {
+ u64 fsid_idx;
+ u32 generation;
+ u32 pad;
+};
+
+struct nfsd4_layout_seg {
+ u32 iomode;
+ u64 offset;
+ u64 length;
+};
+
+struct nfsd4_getdeviceinfo {
+ struct nfsd4_deviceid gd_devid; /* request */
+ u32 gd_layout_type; /* request */
+ u32 gd_maxcount; /* request */
+ u32 gd_notify_types;/* request - response */
+ void *gd_device; /* response */
+};
+
+struct nfsd4_layoutget {
+ u64 lg_minlength; /* request */
+ u32 lg_signal; /* request */
+ u32 lg_layout_type; /* request */
+ u32 lg_maxcount; /* request */
+ stateid_t lg_sid; /* request/response */
+ struct nfsd4_layout_seg lg_seg; /* request/response */
+ void *lg_content; /* response */
+};
+
+struct nfsd4_layoutcommit {
+ stateid_t lc_sid; /* request */
+ struct nfsd4_layout_seg lc_seg; /* request */
+ u32 lc_reclaim; /* request */
+ u32 lc_newoffset; /* request */
+ u64 lc_last_wr; /* request */
+ struct timespec lc_mtime; /* request */
+ u32 lc_layout_type; /* request */
+ u32 lc_up_len; /* layout length */
+ void *lc_up_layout; /* decoded by callback */
+ u32 lc_size_chg; /* boolean for response */
+ u64 lc_newsize; /* response */
+};
+
+struct nfsd4_layoutreturn {
+ u32 lr_return_type; /* request */
+ u32 lr_layout_type; /* request */
+ struct nfsd4_layout_seg lr_seg; /* request */
+ u32 lr_reclaim; /* request */
+ u32 lrf_body_len; /* request */
+ void *lrf_body; /* request */
+ stateid_t lr_sid; /* request/response */
+ u32 lrs_present; /* response */
+};
+
struct nfsd4_fallocate {
/* request */
stateid_t falloc_stateid;
@@ -491,6 +546,10 @@ struct nfsd4_op {
struct nfsd4_reclaim_complete reclaim_complete;
struct nfsd4_test_stateid test_stateid;
struct nfsd4_free_stateid free_stateid;
+ struct nfsd4_getdeviceinfo getdeviceinfo;
+ struct nfsd4_layoutget layoutget;
+ struct nfsd4_layoutcommit layoutcommit;
+ struct nfsd4_layoutreturn layoutreturn;
/* NFSv4.2 */
struct nfsd4_fallocate allocate;