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
45 /* User/Group/Project ID */
48 struct list_head pmi_linkage;
51 /* wildcard file name */
52 struct pcc_match_fname {
54 struct list_head pmf_linkage;
65 struct pcc_expression {
66 enum pcc_field pe_field;
67 struct list_head pe_cond;
68 struct list_head pe_linkage;
71 struct pcc_conjunction {
72 /* link to disjunction */
73 struct list_head pc_linkage;
74 /* list of logical conjunction */
75 struct list_head pc_expressions;
79 * Match rule for auto PCC-cached files.
81 struct pcc_match_rule {
83 struct list_head pmr_conds;
93 enum pcc_dataset_flags {
94 PCC_DATASET_INVALID = 0x0,
95 /* Indicate that known the file is not in PCC. */
96 PCC_DATASET_NONE = 0x01,
97 /* Try auto attach at open, enabled by default */
98 PCC_DATASET_OPEN_ATTACH = 0x02,
99 /* Try auto attach during IO when layout refresh, enabled by default */
100 PCC_DATASET_IO_ATTACH = 0x04,
101 /* Try auto attach at stat */
102 PCC_DATASET_STAT_ATTACH = 0x08,
103 PCC_DATASET_AUTO_ATTACH = PCC_DATASET_OPEN_ATTACH |
104 PCC_DATASET_IO_ATTACH |
105 PCC_DATASET_STAT_ATTACH,
106 /* PCC backend is only used for RW-PCC */
107 PCC_DATASET_RWPCC = 0x10,
108 /* PCC backend is only used for RO-PCC */
109 PCC_DATASET_ROPCC = 0x20,
110 /* PCC backend provides caching services for both RW-PCC and RO-PCC */
111 PCC_DATASET_PCC_ALL = PCC_DATASET_RWPCC | PCC_DATASET_ROPCC,
115 __u32 pccd_rwid; /* Archive ID */
116 __u32 pccd_roid; /* Readonly ID */
117 struct pcc_match_rule pccd_rule; /* Match rule */
118 enum pcc_dataset_flags pccd_flags; /* Flags of PCC backend */
119 char pccd_pathname[PATH_MAX]; /* full path */
120 struct path pccd_path; /* Root path */
121 struct list_head pccd_linkage; /* Linked to pccs_datasets */
122 atomic_t pccd_refcount; /* Reference count */
126 /* Protect pccs_datasets */
127 struct rw_semaphore pccs_rw_sem;
128 /* List of datasets */
129 struct list_head pccs_datasets;
130 /* creds of process who forced instantiation of super block */
131 const struct cred *pccs_cred;
133 * Gobal PCC Generation: it will be increased once the configuration
134 * for PCC is changed, i.e. add or delete a PCC backend, modify the
135 * parameters for PCC.
137 __u64 pccs_generation;
141 struct ll_inode_info *pcci_lli;
142 /* Cache path on local file system */
143 struct path pcci_path;
145 * If reference count is 0, then the cache is not inited, if 1, then
146 * no one is using it.
148 atomic_t pcci_refcount;
149 /* Whether readonly or readwrite PCC */
150 enum lu_pcc_type pcci_type;
151 /* Whether the inode attr is cached locally */
152 bool pcci_attr_valid;
153 /* Layout generation */
154 __u32 pcci_layout_gen;
156 * How many IOs are on going on this cached object. Layout can be
157 * changed only if there is no active IO.
159 atomic_t pcci_active_ios;
160 /* Waitq - wait for PCC I/O completion. */
161 wait_queue_head_t pcci_waitq;
165 /* Opened cache file */
166 struct file *pccf_file;
167 /* Whether readonly or readwrite PCC */
168 enum lu_pcc_type pccf_type;
172 /* read system call */
174 /* write system call */
176 /* truncate, utime system calls */
178 /* stat system call */
180 /* mmap write handling */
182 /* page fault handling */
184 /* fsync system call handling */
186 #ifdef HAVE_DEFAULT_FILE_SPLICE_READ_EXPORT
187 /* splice_read system call */
190 /* open system call */
201 enum pcc_cmd_type pccc_cmd;
207 struct list_head pccc_conds;
208 char *pccc_conds_str;
209 enum pcc_dataset_flags pccc_flags;
217 struct pcc_create_attach {
218 struct pcc_dataset *pca_dataset;
219 struct dentry *pca_dentry;
222 int pcc_super_init(struct pcc_super *super);
223 void pcc_super_fini(struct pcc_super *super);
224 int pcc_cmd_handle(char *buffer, unsigned long count,
225 struct pcc_super *super);
226 int pcc_super_dump(struct pcc_super *super, struct seq_file *m);
227 int pcc_readwrite_attach(struct file *file, struct inode *inode,
229 int pcc_readwrite_attach_fini(struct file *file, struct inode *inode,
230 __u32 gen, bool lease_broken, int rc,
232 int pcc_ioctl_detach(struct inode *inode, __u32 opt);
233 int pcc_ioctl_state(struct file *file, struct inode *inode,
234 struct lu_pcc_state *state);
235 void pcc_file_init(struct pcc_file *pccf);
236 int pcc_file_open(struct inode *inode, struct file *file);
237 void pcc_file_release(struct inode *inode, struct file *file);
238 ssize_t pcc_file_read_iter(struct kiocb *iocb, struct iov_iter *iter,
240 ssize_t pcc_file_write_iter(struct kiocb *iocb, struct iov_iter *iter,
242 int pcc_inode_getattr(struct inode *inode, u32 request_mask,
243 unsigned int flags, bool *cached);
244 int pcc_inode_setattr(struct inode *inode, struct iattr *attr, bool *cached);
245 #ifdef HAVE_DEFAULT_FILE_SPLICE_READ_EXPORT
246 ssize_t pcc_file_splice_read(struct file *in_file, loff_t *ppos,
247 struct pipe_inode_info *pipe, size_t count,
250 int pcc_fsync(struct file *file, loff_t start, loff_t end,
251 int datasync, bool *cached);
252 int pcc_file_mmap(struct file *file, struct vm_area_struct *vma, bool *cached);
253 void pcc_vm_open(struct vm_area_struct *vma);
254 void pcc_vm_close(struct vm_area_struct *vma);
255 int pcc_fault(struct vm_area_struct *mva, struct vm_fault *vmf, bool *cached);
256 int pcc_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf,
258 int pcc_inode_create(struct super_block *sb, struct pcc_dataset *dataset,
259 struct lu_fid *fid, struct dentry **pcc_dentry);
260 int pcc_inode_create_fini(struct inode *inode, struct pcc_create_attach *pca);
261 void pcc_create_attach_cleanup(struct super_block *sb,
262 struct pcc_create_attach *pca);
263 struct pcc_dataset *pcc_dataset_match_get(struct pcc_super *super,
264 struct pcc_matcher *matcher);
265 void pcc_dataset_put(struct pcc_dataset *dataset);
266 void pcc_inode_free(struct inode *inode);
267 void pcc_layout_invalidate(struct inode *inode);
268 #endif /* LLITE_PCC_H */