NFS: inter ssc open
NFSv4.2 inter server to server copy requires the destination server to
READ the data from the source server using the provided stateid and
file handle.
Given an NFSv4 stateid and filehandle from the COPY operaion, provide the
destination server with an NFS client function to create a struct file
suitable for the destiniation server to READ the data to be copied.
Signed-off-by: Olga Kornievskaia <kolga@netapp.com>
Signed-off-by: Andy Adamson <andros@netapp.com>
diff --git a/fs/nfs/nfs4file.c b/fs/nfs/nfs4file.c
index b68b41b..1898262a 100644
--- a/fs/nfs/nfs4file.c
+++ b/fs/nfs/nfs4file.c
@@ -8,6 +8,7 @@
#include <linux/file.h>
#include <linux/falloc.h>
#include <linux/nfs_fs.h>
+#include <linux/file.h>
#include "delegation.h"
#include "internal.h"
#include "iostat.h"
@@ -286,6 +287,99 @@ static loff_t nfs42_remap_file_range(struct file *src_file, loff_t src_off,
out:
return ret < 0 ? ret : count;
}
+
+static int read_name_gen = 1;
+#define SSC_READ_NAME_BODY "ssc_read_%d"
+
+struct file *
+nfs42_ssc_open(struct vfsmount *ss_mnt, struct nfs_fh *src_fh,
+ nfs4_stateid *stateid)
+{
+ struct nfs_fattr fattr;
+ struct file *filep, *res;
+ struct nfs_server *server;
+ struct inode *r_ino = NULL;
+ struct nfs_open_context *ctx;
+ struct nfs4_state_owner *sp;
+ char *read_name;
+ int len, status = 0;
+
+ server = NFS_SERVER(ss_mnt->mnt_root->d_inode);
+
+ nfs_fattr_init(&fattr);
+
+ status = nfs4_proc_getattr(server, src_fh, &fattr, NULL, NULL);
+ if (status < 0) {
+ res = ERR_PTR(status);
+ goto out;
+ }
+
+ res = ERR_PTR(-ENOMEM);
+ len = strlen(SSC_READ_NAME_BODY) + 16;
+ read_name = kzalloc(len, GFP_NOFS);
+ if (read_name == NULL)
+ goto out;
+ snprintf(read_name, len, SSC_READ_NAME_BODY, read_name_gen++);
+
+ r_ino = nfs_fhget(ss_mnt->mnt_root->d_inode->i_sb, src_fh, &fattr,
+ NULL);
+ if (IS_ERR(r_ino)) {
+ res = ERR_CAST(r_ino);
+ goto out;
+ }
+
+ filep = alloc_file_pseudo(r_ino, ss_mnt, read_name, FMODE_READ,
+ r_ino->i_fop);
+ if (IS_ERR(filep)) {
+ res = ERR_CAST(filep);
+ goto out;
+ }
+ filep->f_mode |= FMODE_READ;
+
+ ctx = alloc_nfs_open_context(filep->f_path.dentry, filep->f_mode,
+ filep);
+ if (IS_ERR(ctx)) {
+ res = ERR_CAST(ctx);
+ goto out_filep;
+ }
+
+ res = ERR_PTR(-EINVAL);
+ sp = nfs4_get_state_owner(server, ctx->cred, GFP_KERNEL);
+ if (sp == NULL)
+ goto out_ctx;
+
+ ctx->state = nfs4_get_open_state(r_ino, sp);
+ if (ctx->state == NULL)
+ goto out_stateowner;
+
+ set_bit(NFS_OPEN_STATE, &ctx->state->flags);
+ memcpy(&ctx->state->open_stateid.other, &stateid->other,
+ NFS4_STATEID_OTHER_SIZE);
+ update_open_stateid(ctx->state, stateid, NULL, filep->f_mode);
+
+ nfs_file_set_open_context(filep, ctx);
+ put_nfs_open_context(ctx);
+
+ file_ra_state_init(&filep->f_ra, filep->f_mapping->host->i_mapping);
+ res = filep;
+out:
+ return res;
+out_stateowner:
+ nfs4_put_state_owner(sp);
+out_ctx:
+ put_nfs_open_context(ctx);
+out_filep:
+ fput(filep);
+ goto out;
+}
+EXPORT_SYMBOL_GPL(nfs42_ssc_open);
+void nfs42_ssc_close(struct file *filep)
+{
+ struct nfs_open_context *ctx = nfs_file_open_context(filep);
+
+ ctx->state->flags = 0;
+}
+EXPORT_SYMBOL_GPL(nfs42_ssc_close);
#endif /* CONFIG_NFS_V4_2 */
const struct file_operations nfs4_file_operations = {
