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-rw-r--r--fs/smb/client/fscache.h149
1 files changed, 149 insertions, 0 deletions
diff --git a/fs/smb/client/fscache.h b/fs/smb/client/fscache.h
new file mode 100644
index 0000000000..a3d7372091
--- /dev/null
+++ b/fs/smb/client/fscache.h
@@ -0,0 +1,149 @@
+/* SPDX-License-Identifier: LGPL-2.1 */
+/*
+ * CIFS filesystem cache interface definitions
+ *
+ * Copyright (c) 2010 Novell, Inc.
+ * Authors(s): Suresh Jayaraman (sjayaraman@suse.de>
+ *
+ */
+#ifndef _CIFS_FSCACHE_H
+#define _CIFS_FSCACHE_H
+
+#include <linux/swap.h>
+#include <linux/fscache.h>
+
+#include "cifsglob.h"
+
+/*
+ * Coherency data attached to CIFS volume within the cache
+ */
+struct cifs_fscache_volume_coherency_data {
+ __le64 resource_id; /* unique server resource id */
+ __le64 vol_create_time;
+ __le32 vol_serial_number;
+} __packed;
+
+/*
+ * Coherency data attached to CIFS inode within the cache.
+ */
+struct cifs_fscache_inode_coherency_data {
+ __le64 last_write_time_sec;
+ __le64 last_change_time_sec;
+ __le32 last_write_time_nsec;
+ __le32 last_change_time_nsec;
+};
+
+#ifdef CONFIG_CIFS_FSCACHE
+
+/*
+ * fscache.c
+ */
+extern int cifs_fscache_get_super_cookie(struct cifs_tcon *);
+extern void cifs_fscache_release_super_cookie(struct cifs_tcon *);
+
+extern void cifs_fscache_get_inode_cookie(struct inode *inode);
+extern void cifs_fscache_release_inode_cookie(struct inode *);
+extern void cifs_fscache_unuse_inode_cookie(struct inode *inode, bool update);
+
+static inline
+void cifs_fscache_fill_coherency(struct inode *inode,
+ struct cifs_fscache_inode_coherency_data *cd)
+{
+ struct timespec64 ctime = inode_get_ctime(inode);
+ struct timespec64 mtime = inode_get_mtime(inode);
+
+ memset(cd, 0, sizeof(*cd));
+ cd->last_write_time_sec = cpu_to_le64(mtime.tv_sec);
+ cd->last_write_time_nsec = cpu_to_le32(mtime.tv_nsec);
+ cd->last_change_time_sec = cpu_to_le64(ctime.tv_sec);
+ cd->last_change_time_nsec = cpu_to_le32(ctime.tv_nsec);
+}
+
+
+static inline struct fscache_cookie *cifs_inode_cookie(struct inode *inode)
+{
+ return netfs_i_cookie(&CIFS_I(inode)->netfs);
+}
+
+static inline void cifs_invalidate_cache(struct inode *inode, unsigned int flags)
+{
+ struct cifs_fscache_inode_coherency_data cd;
+
+ cifs_fscache_fill_coherency(inode, &cd);
+ fscache_invalidate(cifs_inode_cookie(inode), &cd,
+ i_size_read(inode), flags);
+}
+
+extern int __cifs_fscache_query_occupancy(struct inode *inode,
+ pgoff_t first, unsigned int nr_pages,
+ pgoff_t *_data_first,
+ unsigned int *_data_nr_pages);
+
+static inline int cifs_fscache_query_occupancy(struct inode *inode,
+ pgoff_t first, unsigned int nr_pages,
+ pgoff_t *_data_first,
+ unsigned int *_data_nr_pages)
+{
+ if (!cifs_inode_cookie(inode))
+ return -ENOBUFS;
+ return __cifs_fscache_query_occupancy(inode, first, nr_pages,
+ _data_first, _data_nr_pages);
+}
+
+extern int __cifs_readpage_from_fscache(struct inode *pinode, struct page *ppage);
+extern void __cifs_readahead_to_fscache(struct inode *pinode, loff_t pos, size_t len);
+
+
+static inline int cifs_readpage_from_fscache(struct inode *inode,
+ struct page *page)
+{
+ if (cifs_inode_cookie(inode))
+ return __cifs_readpage_from_fscache(inode, page);
+ return -ENOBUFS;
+}
+
+static inline void cifs_readahead_to_fscache(struct inode *inode,
+ loff_t pos, size_t len)
+{
+ if (cifs_inode_cookie(inode))
+ __cifs_readahead_to_fscache(inode, pos, len);
+}
+
+#else /* CONFIG_CIFS_FSCACHE */
+static inline
+void cifs_fscache_fill_coherency(struct inode *inode,
+ struct cifs_fscache_inode_coherency_data *cd)
+{
+}
+
+static inline int cifs_fscache_get_super_cookie(struct cifs_tcon *tcon) { return 0; }
+static inline void cifs_fscache_release_super_cookie(struct cifs_tcon *tcon) {}
+
+static inline void cifs_fscache_get_inode_cookie(struct inode *inode) {}
+static inline void cifs_fscache_release_inode_cookie(struct inode *inode) {}
+static inline void cifs_fscache_unuse_inode_cookie(struct inode *inode, bool update) {}
+static inline struct fscache_cookie *cifs_inode_cookie(struct inode *inode) { return NULL; }
+static inline void cifs_invalidate_cache(struct inode *inode, unsigned int flags) {}
+
+static inline int cifs_fscache_query_occupancy(struct inode *inode,
+ pgoff_t first, unsigned int nr_pages,
+ pgoff_t *_data_first,
+ unsigned int *_data_nr_pages)
+{
+ *_data_first = ULONG_MAX;
+ *_data_nr_pages = 0;
+ return -ENOBUFS;
+}
+
+static inline int
+cifs_readpage_from_fscache(struct inode *inode, struct page *page)
+{
+ return -ENOBUFS;
+}
+
+static inline
+void cifs_readahead_to_fscache(struct inode *inode, loff_t pos, size_t len) {}
+
+#endif /* CONFIG_CIFS_FSCACHE */
+
+#endif /* _CIFS_FSCACHE_H */