| yuezonghe | 824eb0c | 2024-06-27 02:32:26 -0700 | [diff] [blame] | 1 | /* |
| 2 | * V9FS VFS extensions. |
| 3 | * |
| 4 | * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com> |
| 5 | * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov> |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License version 2 |
| 9 | * as published by the Free Software Foundation. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
| 17 | * along with this program; if not, write to: |
| 18 | * Free Software Foundation |
| 19 | * 51 Franklin Street, Fifth Floor |
| 20 | * Boston, MA 02111-1301 USA |
| 21 | * |
| 22 | */ |
| 23 | #ifndef FS_9P_V9FS_VFS_H |
| 24 | #define FS_9P_V9FS_VFS_H |
| 25 | |
| 26 | /* plan9 semantics are that created files are implicitly opened. |
| 27 | * But linux semantics are that you call create, then open. |
| 28 | * the plan9 approach is superior as it provides an atomic |
| 29 | * open. |
| 30 | * we track the create fid here. When the file is opened, if fidopen is |
| 31 | * non-zero, we use the fid and can skip some steps. |
| 32 | * there may be a better way to do this, but I don't know it. |
| 33 | * one BAD way is to clunk the fid on create, then open it again: |
| 34 | * you lose the atomicity of file open |
| 35 | */ |
| 36 | |
| 37 | /* special case: |
| 38 | * unlink calls remove, which is an implicit clunk. So we have to track |
| 39 | * that kind of thing so that we don't try to clunk a dead fid. |
| 40 | */ |
| 41 | #define P9_LOCK_TIMEOUT (30*HZ) |
| 42 | |
| 43 | extern struct file_system_type v9fs_fs_type; |
| 44 | extern const struct address_space_operations v9fs_addr_operations; |
| 45 | extern const struct file_operations v9fs_file_operations; |
| 46 | extern const struct file_operations v9fs_file_operations_dotl; |
| 47 | extern const struct file_operations v9fs_dir_operations; |
| 48 | extern const struct file_operations v9fs_dir_operations_dotl; |
| 49 | extern const struct dentry_operations v9fs_dentry_operations; |
| 50 | extern const struct dentry_operations v9fs_cached_dentry_operations; |
| 51 | extern const struct file_operations v9fs_cached_file_operations; |
| 52 | extern const struct file_operations v9fs_cached_file_operations_dotl; |
| 53 | extern struct kmem_cache *v9fs_inode_cache; |
| 54 | |
| 55 | struct inode *v9fs_alloc_inode(struct super_block *sb); |
| 56 | void v9fs_destroy_inode(struct inode *inode); |
| 57 | struct inode *v9fs_get_inode(struct super_block *sb, umode_t mode, dev_t); |
| 58 | int v9fs_init_inode(struct v9fs_session_info *v9ses, |
| 59 | struct inode *inode, umode_t mode, dev_t); |
| 60 | void v9fs_evict_inode(struct inode *inode); |
| 61 | ino_t v9fs_qid2ino(struct p9_qid *qid); |
| 62 | void v9fs_stat2inode(struct p9_wstat *, struct inode *, struct super_block *); |
| 63 | void v9fs_stat2inode_dotl(struct p9_stat_dotl *, struct inode *); |
| 64 | int v9fs_dir_release(struct inode *inode, struct file *filp); |
| 65 | int v9fs_file_open(struct inode *inode, struct file *file); |
| 66 | void v9fs_inode2stat(struct inode *inode, struct p9_wstat *stat); |
| 67 | int v9fs_uflags2omode(int uflags, int extended); |
| 68 | |
| 69 | ssize_t v9fs_file_readn(struct file *, char *, char __user *, u32, u64); |
| 70 | ssize_t v9fs_fid_readn(struct p9_fid *, char *, char __user *, u32, u64); |
| 71 | void v9fs_blank_wstat(struct p9_wstat *wstat); |
| 72 | int v9fs_vfs_setattr_dotl(struct dentry *, struct iattr *); |
| 73 | int v9fs_file_fsync_dotl(struct file *filp, loff_t start, loff_t end, |
| 74 | int datasync); |
| 75 | ssize_t v9fs_file_write_internal(struct inode *, struct p9_fid *, |
| 76 | const char __user *, size_t, loff_t *, int); |
| 77 | int v9fs_refresh_inode(struct p9_fid *fid, struct inode *inode); |
| 78 | int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode); |
| 79 | static inline void v9fs_invalidate_inode_attr(struct inode *inode) |
| 80 | { |
| 81 | struct v9fs_inode *v9inode; |
| 82 | v9inode = V9FS_I(inode); |
| 83 | v9inode->cache_validity |= V9FS_INO_INVALID_ATTR; |
| 84 | return; |
| 85 | } |
| 86 | |
| 87 | int v9fs_open_to_dotl_flags(int flags); |
| 88 | #endif |