projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 9e82cf6a EVH |
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 | |
| 42e8c509 EVH |
8 | * it under the terms of the GNU General Public License version 2 |
| 9 | * as published by the Free Software Foundation. | |
| 9e82cf6a EVH |
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 | */ | |
| e0459f57 AK |
23 | #ifndef FS_9P_V9FS_VFS_H |
| 24 | #define FS_9P_V9FS_VFS_H | |
| 9e82cf6a EVH |
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 | */ | |
| e0459f57 | 41 | #define P9_LOCK_TIMEOUT (30*HZ) |
| 9e82cf6a | 42 | |
| 5e3cc1ee HT |
43 | /* flags for v9fs_stat2inode() & v9fs_stat2inode_dotl() */ |
| 44 | #define V9FS_STAT2INODE_KEEP_ISIZE 1 | |
| 45 | ||
| 9e82cf6a | 46 | extern struct file_system_type v9fs_fs_type; |
| f5e54d6e | 47 | extern const struct address_space_operations v9fs_addr_operations; |
| 4b6f5d20 | 48 | extern const struct file_operations v9fs_file_operations; |
| 9b6533c9 | 49 | extern const struct file_operations v9fs_file_operations_dotl; |
| 4b6f5d20 | 50 | extern const struct file_operations v9fs_dir_operations; |
| 9b6533c9 | 51 | extern const struct file_operations v9fs_dir_operations_dotl; |
| a488257c AV |
52 | extern const struct dentry_operations v9fs_dentry_operations; |
| 53 | extern const struct dentry_operations v9fs_cached_dentry_operations; | |
| 29236f4e AK |
54 | extern const struct file_operations v9fs_cached_file_operations; |
| 55 | extern const struct file_operations v9fs_cached_file_operations_dotl; | |
| fb89b45c DM |
56 | extern const struct file_operations v9fs_mmap_file_operations; |
| 57 | extern const struct file_operations v9fs_mmap_file_operations_dotl; | |
| a78ce05d | 58 | extern struct kmem_cache *v9fs_inode_cache; |
| 9e82cf6a | 59 | |
| 60e78d2c AK |
60 | struct inode *v9fs_alloc_inode(struct super_block *sb); |
| 61 | void v9fs_destroy_inode(struct inode *inode); | |
| 3eda0de6 | 62 | struct inode *v9fs_get_inode(struct super_block *sb, umode_t mode, dev_t); |
| 5ffc0cb3 | 63 | int v9fs_init_inode(struct v9fs_session_info *v9ses, |
| 3eda0de6 | 64 | struct inode *inode, umode_t mode, dev_t); |
| b57922d9 | 65 | void v9fs_evict_inode(struct inode *inode); |
| bd238fb4 | 66 | ino_t v9fs_qid2ino(struct p9_qid *qid); |
| 5e3cc1ee HT |
67 | void v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode, |
| 68 | struct super_block *sb, unsigned int flags); | |
| 69 | void v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode, | |
| 70 | unsigned int flags); | |
| 9e82cf6a EVH |
71 | int v9fs_dir_release(struct inode *inode, struct file *filp); |
| 72 | int v9fs_file_open(struct inode *inode, struct file *file); | |
| 51a87c55 | 73 | void v9fs_inode2stat(struct inode *inode, struct p9_wstat *stat); |
| 2e4bef41 | 74 | int v9fs_uflags2omode(int uflags, int extended); |
| fbedadc1 | 75 | |
| 7a4439c4 | 76 | void v9fs_blank_wstat(struct p9_wstat *wstat); |
| 22d8dcdf | 77 | int v9fs_vfs_setattr_dotl(struct dentry *, struct iattr *); |
| 02c24a82 JB |
78 | int v9fs_file_fsync_dotl(struct file *filp, loff_t start, loff_t end, |
| 79 | int datasync); | |
| b3cbea03 AK |
80 | int v9fs_refresh_inode(struct p9_fid *fid, struct inode *inode); |
| 81 | int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode); | |
| 82 | static inline void v9fs_invalidate_inode_attr(struct inode *inode) | |
| 83 | { | |
| 84 | struct v9fs_inode *v9inode; | |
| 85 | v9inode = V9FS_I(inode); | |
| 86 | v9inode->cache_validity |= V9FS_INO_INVALID_ATTR; | |
| 87 | return; | |
| 88 | } | |
| f88657ce AK |
89 | |
| 90 | int v9fs_open_to_dotl_flags(int flags); | |
| 5e3cc1ee HT |
91 | |
| 92 | static inline void v9fs_i_size_write(struct inode *inode, loff_t i_size) | |
| 93 | { | |
| 94 | /* | |
| 95 | * 32-bit need the lock, concurrent updates could break the | |
| 96 | * sequences and make i_size_read() loop forever. | |
| 97 | * 64-bit updates are atomic and can skip the locking. | |
| 98 | */ | |
| 99 | if (sizeof(i_size) > sizeof(long)) | |
| 100 | spin_lock(&inode->i_lock); | |
| 101 | i_size_write(inode, i_size); | |
| 102 | if (sizeof(i_size) > sizeof(long)) | |
| 103 | spin_unlock(&inode->i_lock); | |
| 104 | } | |
| e0459f57 | 105 | #endif |