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-rw-r--r--fs/nfs/nfs4file.c189
1 files changed, 189 insertions, 0 deletions
diff --git a/fs/nfs/nfs4file.c b/fs/nfs/nfs4file.c
new file mode 100644
index 000000000..f58c17b3b
--- /dev/null
+++ b/fs/nfs/nfs4file.c
@@ -0,0 +1,189 @@
+/*
+ * linux/fs/nfs/file.c
+ *
+ * Copyright (C) 1992 Rick Sladkey
+ */
+#include <linux/fs.h>
+#include <linux/falloc.h>
+#include <linux/nfs_fs.h>
+#include "internal.h"
+#include "fscache.h"
+#include "pnfs.h"
+
+#include "nfstrace.h"
+
+#ifdef CONFIG_NFS_V4_2
+#include "nfs42.h"
+#endif
+
+#define NFSDBG_FACILITY NFSDBG_FILE
+
+static int
+nfs4_file_open(struct inode *inode, struct file *filp)
+{
+ struct nfs_open_context *ctx;
+ struct dentry *dentry = filp->f_path.dentry;
+ struct dentry *parent = NULL;
+ struct inode *dir;
+ unsigned openflags = filp->f_flags;
+ struct iattr attr;
+ int opened = 0;
+ int err;
+
+ /*
+ * If no cached dentry exists or if it's negative, NFSv4 handled the
+ * opens in ->lookup() or ->create().
+ *
+ * We only get this far for a cached positive dentry. We skipped
+ * revalidation, so handle it here by dropping the dentry and returning
+ * -EOPENSTALE. The VFS will retry the lookup/create/open.
+ */
+
+ dprintk("NFS: open file(%pd2)\n", dentry);
+
+ if ((openflags & O_ACCMODE) == 3)
+ openflags--;
+
+ /* We can't create new files here */
+ openflags &= ~(O_CREAT|O_EXCL);
+
+ parent = dget_parent(dentry);
+ dir = d_inode(parent);
+
+ ctx = alloc_nfs_open_context(filp->f_path.dentry, filp->f_mode);
+ err = PTR_ERR(ctx);
+ if (IS_ERR(ctx))
+ goto out;
+
+ attr.ia_valid = ATTR_OPEN;
+ if (openflags & O_TRUNC) {
+ attr.ia_valid |= ATTR_SIZE;
+ attr.ia_size = 0;
+ nfs_sync_inode(inode);
+ }
+
+ inode = NFS_PROTO(dir)->open_context(dir, ctx, openflags, &attr, &opened);
+ if (IS_ERR(inode)) {
+ err = PTR_ERR(inode);
+ switch (err) {
+ case -EPERM:
+ case -EACCES:
+ case -EDQUOT:
+ case -ENOSPC:
+ case -EROFS:
+ goto out_put_ctx;
+ default:
+ goto out_drop;
+ }
+ }
+ if (inode != d_inode(dentry))
+ goto out_drop;
+
+ nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
+ nfs_file_set_open_context(filp, ctx);
+ nfs_fscache_open_file(inode, filp);
+ err = 0;
+
+out_put_ctx:
+ put_nfs_open_context(ctx);
+out:
+ dput(parent);
+ return err;
+
+out_drop:
+ d_drop(dentry);
+ err = -EOPENSTALE;
+ goto out_put_ctx;
+}
+
+static int
+nfs4_file_fsync(struct file *file, loff_t start, loff_t end, int datasync)
+{
+ int ret;
+ struct inode *inode = file_inode(file);
+
+ trace_nfs_fsync_enter(inode);
+
+ nfs_inode_dio_wait(inode);
+ do {
+ ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
+ if (ret != 0)
+ break;
+ mutex_lock(&inode->i_mutex);
+ ret = nfs_file_fsync_commit(file, start, end, datasync);
+ if (!ret)
+ ret = pnfs_sync_inode(inode, !!datasync);
+ mutex_unlock(&inode->i_mutex);
+ /*
+ * If nfs_file_fsync_commit detected a server reboot, then
+ * resend all dirty pages that might have been covered by
+ * the NFS_CONTEXT_RESEND_WRITES flag
+ */
+ start = 0;
+ end = LLONG_MAX;
+ } while (ret == -EAGAIN);
+
+ trace_nfs_fsync_exit(inode, ret);
+ return ret;
+}
+
+#ifdef CONFIG_NFS_V4_2
+static loff_t nfs4_file_llseek(struct file *filep, loff_t offset, int whence)
+{
+ loff_t ret;
+
+ switch (whence) {
+ case SEEK_HOLE:
+ case SEEK_DATA:
+ ret = nfs42_proc_llseek(filep, offset, whence);
+ if (ret != -ENOTSUPP)
+ return ret;
+ default:
+ return nfs_file_llseek(filep, offset, whence);
+ }
+}
+
+static long nfs42_fallocate(struct file *filep, int mode, loff_t offset, loff_t len)
+{
+ struct inode *inode = file_inode(filep);
+ long ret;
+
+ if (!S_ISREG(inode->i_mode))
+ return -EOPNOTSUPP;
+
+ if ((mode != 0) && (mode != (FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE)))
+ return -EOPNOTSUPP;
+
+ ret = inode_newsize_ok(inode, offset + len);
+ if (ret < 0)
+ return ret;
+
+ if (mode & FALLOC_FL_PUNCH_HOLE)
+ return nfs42_proc_deallocate(filep, offset, len);
+ return nfs42_proc_allocate(filep, offset, len);
+}
+#endif /* CONFIG_NFS_V4_2 */
+
+const struct file_operations nfs4_file_operations = {
+#ifdef CONFIG_NFS_V4_2
+ .llseek = nfs4_file_llseek,
+#else
+ .llseek = nfs_file_llseek,
+#endif
+ .read_iter = nfs_file_read,
+ .write_iter = nfs_file_write,
+ .mmap = nfs_file_mmap,
+ .open = nfs4_file_open,
+ .flush = nfs_file_flush,
+ .release = nfs_file_release,
+ .fsync = nfs4_file_fsync,
+ .lock = nfs_lock,
+ .flock = nfs_flock,
+ .splice_read = nfs_file_splice_read,
+ .splice_write = iter_file_splice_write,
+#ifdef CONFIG_NFS_V4_2
+ .fallocate = nfs42_fallocate,
+#endif /* CONFIG_NFS_V4_2 */
+ .check_flags = nfs_check_flags,
+ .setlease = simple_nosetlease,
+};