This patch adds support for using the NFS v4.2 operation DEALLOCATE to
punch holes in a file.
Signed-off-by: Anna Schumaker <Anna.Schumaker@xxxxxxxxxx>
---
fs/nfs/nfs42.h | 1 +
fs/nfs/nfs42proc.c | 46 ++++++++++++++++++++++++++++++++
fs/nfs/nfs42xdr.c | 68 +++++++++++++++++++++++++++++++++++++++++++++++
fs/nfs/nfs4file.c | 7 +++--
fs/nfs/nfs4proc.c | 1 +
fs/nfs/nfs4xdr.c | 1 +
include/linux/nfs4.h | 1 +
include/linux/nfs_fs_sb.h | 1 +
include/linux/nfs_xdr.h | 14 ++++++++++
9 files changed, 138 insertions(+), 2 deletions(-)
diff --git a/fs/nfs/nfs42.h b/fs/nfs/nfs42.h
index 42656a9..7afb894 100644
--- a/fs/nfs/nfs42.h
+++ b/fs/nfs/nfs42.h
@@ -7,6 +7,7 @@
/* nfs4.2proc.c */
int nfs42_proc_allocate(struct file *, loff_t, loff_t);
+int nfs42_proc_deallocate(struct file *, loff_t, loff_t);
loff_t nfs42_proc_llseek(struct file *, loff_t, int);
/* nfs4.2xdr.h */
diff --git a/fs/nfs/nfs42proc.c b/fs/nfs/nfs42proc.c
index 44e0c7b..9613362 100644
--- a/fs/nfs/nfs42proc.c
+++ b/fs/nfs/nfs42proc.c
@@ -78,6 +78,52 @@ int nfs42_proc_allocate(struct file *filep, loff_t offset, loff_t len)
return err;
}
+int _nfs42_proc_deallocate(struct file *filep, loff_t offset, loff_t len)
+{
+ struct nfs42_deallocate_args args = {
+ .dealloc_fh = NFS_FH(file_inode(filep)),
+ .dealloc_offset = offset,
+ .dealloc_length = len,
+ };
+ struct nfs42_deallocate_res res;
+ struct rpc_message msg = {
+ .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DEALLOCATE],
+ .rpc_argp = &args,
+ .rpc_resp = &res,
+ };
+ struct nfs_server *server = NFS_SERVER(file_inode(filep));
+ int status;
+
+ status = nfs42_set_rw_stateid(&args.dealloc_stateid, filep, FMODE_WRITE);
+ if (status)
+ return status;
+
+ return nfs4_call_sync(server->client, server, &msg,
+ &args.seq_args, &res.seq_res, 0);
+}
+
+int nfs42_proc_deallocate(struct file *filep, loff_t offset, loff_t len)
+{
+ struct inode *inode = file_inode(filep);
+ struct nfs_server *server = NFS_SERVER(inode);
+ struct nfs4_exception exception = { };
+ int err;
+
+ if (!nfs_server_capable(inode, NFS_CAP_DEALLOCATE))
+ return -EOPNOTSUPP;
+
+ do {
+ err = _nfs42_proc_deallocate(filep, offset, len);
+ if (err == -ENOTSUPP) {
+ server->caps &= ~NFS_CAP_DEALLOCATE;
+ return -EOPNOTSUPP;
+ }
+ err = nfs4_handle_exception(server, err, &exception);
+ } while (exception.retry);
+
+ return err;
+}
+
loff_t nfs42_proc_llseek(struct file *filep, loff_t offset, int whence)
{
struct inode *inode = file_inode(filep);
diff --git a/fs/nfs/nfs42xdr.c b/fs/nfs/nfs42xdr.c
index 9506f5a..5db9dad 100644
--- a/fs/nfs/nfs42xdr.c
+++ b/fs/nfs/nfs42xdr.c
@@ -9,6 +9,11 @@
2 /* offest */ + \
2 /* length */)
#define decode_allocate_maxsz (op_decode_hdr_maxsz)
+#define encode_deallocate_maxsz (op_encode_hdr_maxsz + \
+ XDR_QUADLEN(NFS4_STATEID_SIZE) + \
+ 2 /* offest */ + \
+ 2 /* length */)
+#define decode_deallocate_maxsz (op_decode_hdr_maxsz)
#define encode_seek_maxsz (op_encode_hdr_maxsz + \
encode_stateid_maxsz + \
2 /* offset */ + \
@@ -25,6 +30,12 @@
#define NFS4_dec_allocate_sz (compound_decode_hdr_maxsz + \
decode_putfh_maxsz + \
decode_allocate_maxsz)
+#define NFS4_enc_deallocate_sz (compound_encode_hdr_maxsz + \
+ encode_putfh_maxsz + \
+ encode_deallocate_maxsz)
+#define NFS4_dec_deallocate_sz (compound_decode_hdr_maxsz + \
+ decode_putfh_maxsz + \
+ decode_deallocate_maxsz)
#define NFS4_enc_seek_sz (compound_encode_hdr_maxsz + \
encode_putfh_maxsz + \
encode_seek_maxsz)
@@ -43,6 +54,16 @@ static void encode_allocate(struct xdr_stream *xdr,
encode_uint64(xdr, args->alloc_length);
}
+static void encode_deallocate(struct xdr_stream *xdr,
+ struct nfs42_deallocate_args *args,
+ struct compound_hdr *hdr)
+{
+ encode_op_hdr(xdr, OP_DEALLOCATE, decode_deallocate_maxsz, hdr);
+ encode_nfs4_stateid(xdr, &args->dealloc_stateid);
+ encode_uint64(xdr, args->dealloc_offset);
+ encode_uint64(xdr, args->dealloc_length);
+}
+
static void encode_seek(struct xdr_stream *xdr,
struct nfs42_seek_args *args,
struct compound_hdr *hdr)
@@ -72,6 +93,24 @@ static void nfs4_xdr_enc_allocate(struct rpc_rqst *req,
}
/*
+ * Encode DEALLOCATE request
+ */
+static void nfs4_xdr_enc_deallocate(struct rpc_rqst *req,
+ struct xdr_stream *xdr,
+ struct nfs42_deallocate_args *args)
+{
+ struct compound_hdr hdr = {
+ .minorversion = nfs4_xdr_minorversion(&args->seq_args),
+ };
+
+ encode_compound_hdr(xdr, req, &hdr);
+ encode_sequence(xdr, &args->seq_args, &hdr);
+ encode_putfh(xdr, args->dealloc_fh, &hdr);
+ encode_deallocate(xdr, args, &hdr);
+ encode_nops(&hdr);
+}
+
+/*
* Encode SEEK request
*/
static void nfs4_xdr_enc_seek(struct rpc_rqst *req,
@@ -94,6 +133,11 @@ static int decode_allocate(struct xdr_stream *xdr, struct nfs42_allocate_res *re
return decode_op_hdr(xdr, OP_ALLOCATE);
}
+static int decode_deallocate(struct xdr_stream *xdr, struct nfs42_deallocate_res *res)
+{
+ return decode_op_hdr(xdr, OP_DEALLOCATE);
+}
+
static int decode_seek(struct xdr_stream *xdr, struct nfs42_seek_res *res)
{
int status;
@@ -141,6 +185,30 @@ out:
}
/*
+ * Decode DEALLOCATE request
+ */
+static int nfs4_xdr_dec_deallocate(struct rpc_rqst *rqstp,
+ struct xdr_stream *xdr,
+ struct nfs42_deallocate_res *res)
+{
+ struct compound_hdr hdr;
+ int status;
+
+ status = decode_compound_hdr(xdr, &hdr);
+ if (status)
+ goto out;
+ status = decode_sequence(xdr, &res->seq_res, rqstp);
+ if (status)
+ goto out;
+ status = decode_putfh(xdr);
+ if (status)
+ goto out;
+ status = decode_deallocate(xdr, res);
+out:
+ return status;
+}
+
+/*
* Decode SEEK request
*/
static int nfs4_xdr_dec_seek(struct rpc_rqst *rqstp,
diff --git a/fs/nfs/nfs4file.c b/fs/nfs/nfs4file.c
index 6256957..1b2d82d 100644
--- a/fs/nfs/nfs4file.c
+++ b/fs/nfs/nfs4file.c
@@ -142,11 +142,14 @@ static long nfs42_fallocate(struct file *filep, int mode, loff_t offset, loff_t
struct inode *inode = file_inode(filep);
long ret;
- if (mode != 0)
+ if ((mode != 0) && (mode != (FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE)))
return -EOPNOTSUPP;
mutex_lock(&inode->i_mutex);
- ret = nfs42_proc_allocate(filep, offset, len);
+ if (mode & FALLOC_FL_PUNCH_HOLE)
+ ret = nfs42_proc_deallocate(filep, offset, len);
+ else
+ ret = nfs42_proc_allocate(filep, offset, len);
mutex_unlock(&inode->i_mutex);
return ret;
}
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 65a3859..cb5dd74 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -8432,6 +8432,7 @@ static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = {
| NFS_CAP_STATEID_NFSV41
| NFS_CAP_ATOMIC_OPEN_V1
| NFS_CAP_ALLOCATE
+ | NFS_CAP_DEALLOCATE
| NFS_CAP_SEEK,
.init_client = nfs41_init_client,
.shutdown_client = nfs41_shutdown_client,
diff --git a/fs/nfs/nfs4xdr.c b/fs/nfs/nfs4xdr.c
index 0a14845..03d0fa6 100644
--- a/fs/nfs/nfs4xdr.c
+++ b/fs/nfs/nfs4xdr.c
@@ -7395,6 +7395,7 @@ struct rpc_procinfo nfs4_procedures[] = {
#ifdef CONFIG_NFS_V4_2
PROC(SEEK, enc_seek, dec_seek),
PROC(ALLOCATE, enc_allocate, dec_allocate),
+ PROC(DEALLOCATE, enc_deallocate, dec_deallocate),
#endif /* CONFIG_NFS_V4_2 */
};
diff --git a/include/linux/nfs4.h b/include/linux/nfs4.h
index 2b28a21..022b761 100644
--- a/include/linux/nfs4.h
+++ b/include/linux/nfs4.h
@@ -491,6 +491,7 @@ enum {
/* nfs42 */
NFSPROC4_CLNT_SEEK,
NFSPROC4_CLNT_ALLOCATE,
+ NFSPROC4_CLNT_DEALLOCATE,
};
/* nfs41 types */
diff --git a/include/linux/nfs_fs_sb.h b/include/linux/nfs_fs_sb.h
index df6ed42..1e37fbb 100644
--- a/include/linux/nfs_fs_sb.h
+++ b/include/linux/nfs_fs_sb.h
@@ -232,5 +232,6 @@ struct nfs_server {
#define NFS_CAP_SECURITY_LABEL (1U << 18)
#define NFS_CAP_SEEK (1U << 19)
#define NFS_CAP_ALLOCATE (1U << 20)
+#define NFS_CAP_DEALLOCATE (1U << 21)
#endif
diff --git a/include/linux/nfs_xdr.h b/include/linux/nfs_xdr.h
index f3fc647..9098e51 100644
--- a/include/linux/nfs_xdr.h
+++ b/include/linux/nfs_xdr.h
@@ -1246,6 +1246,20 @@ struct nfs42_allocate_res {
unsigned int status;
};
+struct nfs42_deallocate_args {
+ struct nfs4_sequence_args seq_args;
+
+ struct nfs_fh *dealloc_fh;
+ nfs4_stateid dealloc_stateid;
+ u64 dealloc_offset;
+ u64 dealloc_length;
+};
+
+struct nfs42_deallocate_res {
+ struct nfs4_sequence_res seq_res;
+ unsigned int status;
+};
+
struct nfs42_seek_args {
struct nfs4_sequence_args seq_args;
--
2.1.2
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