4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see
18 * http://www.gnu.org/licenses/gpl-2.0.html
23 * Copyright (c) 2017, DDN Storage Corporation.
27 * Persistent Client Cache
29 * Author: Li Xi <lixi@ddn.com>
35 #include <linux/types.h>
37 #include <linux/seq_file.h>
39 #include <uapi/linux/lustre/lustre_user.h>
41 extern struct kmem_cache *pcc_inode_slab;
43 #define LPROCFS_WR_PCC_MAX_CMD 4096
46 __u32 pccd_id; /* Archive ID */
47 __u32 pccd_projid; /* Project ID */
48 char pccd_pathname[PATH_MAX]; /* full path */
49 struct path pccd_path; /* Root path */
50 struct list_head pccd_linkage; /* Linked to pccs_datasets */
51 atomic_t pccd_refcount; /* reference count */
55 spinlock_t pccs_lock; /* Protect pccs_datasets */
56 struct list_head pccs_datasets; /* List of datasets */
60 struct ll_inode_info *pcci_lli;
61 /* Cache path on local file system */
62 struct path pcci_path;
64 * If reference count is 0, then the cache is not inited, if 1, then
67 atomic_t pcci_refcount;
68 /* Whether readonly or readwrite PCC */
69 enum lu_pcc_type pcci_type;
70 /* Whether the inode attr is cached locally */
72 /* Layout generation */
73 __u32 pcci_layout_gen;
75 * How many IOs are on going on this cached object. Layout can be
76 * changed only if there is no active IO.
78 atomic_t pcci_active_ios;
79 /* Waitq - wait for PCC I/O completion. */
80 wait_queue_head_t pcci_waitq;
84 /* Opened cache file */
85 struct file *pccf_file;
86 /* Whether readonly or readwrite PCC */
87 enum lu_pcc_type pccf_type;
97 enum pcc_cmd_type pccc_cmd;
110 void pcc_super_init(struct pcc_super *super);
111 void pcc_super_fini(struct pcc_super *super);
112 int pcc_cmd_handle(char *buffer, unsigned long count,
113 struct pcc_super *super);
114 int pcc_super_dump(struct pcc_super *super, struct seq_file *m);
115 int pcc_readwrite_attach(struct file *file, struct inode *inode,
117 int pcc_readwrite_attach_fini(struct file *file, struct inode *inode,
118 __u32 gen, bool lease_broken, int rc,
120 int pcc_ioctl_detach(struct inode *inode);
121 int pcc_ioctl_state(struct file *file, struct inode *inode,
122 struct lu_pcc_state *state);
123 void pcc_file_init(struct pcc_file *pccf);
124 int pcc_file_open(struct inode *inode, struct file *file);
125 void pcc_file_release(struct inode *inode, struct file *file);
126 ssize_t pcc_file_read_iter(struct kiocb *iocb, struct iov_iter *iter,
128 ssize_t pcc_file_write_iter(struct kiocb *iocb, struct iov_iter *iter,
130 int pcc_inode_getattr(struct inode *inode, bool *cached);
131 int pcc_inode_setattr(struct inode *inode, struct iattr *attr, bool *cached);
132 ssize_t pcc_file_splice_read(struct file *in_file, loff_t *ppos,
133 struct pipe_inode_info *pipe, size_t count,
134 unsigned int flags, bool *cached);
135 int pcc_fsync(struct file *file, loff_t start, loff_t end,
136 int datasync, bool *cached);
137 int pcc_file_mmap(struct file *file, struct vm_area_struct *vma, bool *cached);
138 void pcc_vm_open(struct vm_area_struct *vma);
139 void pcc_vm_close(struct vm_area_struct *vma);
140 int pcc_fault(struct vm_area_struct *mva, struct vm_fault *vmf, bool *cached);
141 int pcc_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf,
143 int pcc_inode_create(struct pcc_dataset *dataset, struct lu_fid *fid,
144 struct dentry **pcc_dentry);
145 int pcc_inode_create_fini(struct pcc_dataset *dataset, struct inode *inode,
146 struct dentry *pcc_dentry);
147 struct pcc_dataset *pcc_dataset_get(struct pcc_super *super, __u32 projid,
149 void pcc_dataset_put(struct pcc_dataset *dataset);
150 void pcc_inode_free(struct inode *inode);
151 void pcc_layout_invalidate(struct inode *inode);
153 #endif /* LLITE_PCC_H */