1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * V9FS VFS extensions. 4 * 5 * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com> 6 * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov> 7 */ 8 #ifndef FS_9P_V9FS_VFS_H 9 #define FS_9P_V9FS_VFS_H 10 11 /* plan9 semantics are that created files are implicitly opened. 12 * But linux semantics are that you call create, then open. 13 * the plan9 approach is superior as it provides an atomic 14 * open. 15 * we track the create fid here. When the file is opened, if fidopen is 16 * non-zero, we use the fid and can skip some steps. 17 * there may be a better way to do this, but I don't know it. 18 * one BAD way is to clunk the fid on create, then open it again: 19 * you lose the atomicity of file open 20 */ 21 22 /* special case: 23 * unlink calls remove, which is an implicit clunk. So we have to track 24 * that kind of thing so that we don't try to clunk a dead fid. 25 */ 26 #define P9_LOCK_TIMEOUT (30*HZ) 27 28 /* flags for v9fs_stat2inode() & v9fs_stat2inode_dotl() */ 29 #define V9FS_STAT2INODE_KEEP_ISIZE 1 30 31 extern struct file_system_type v9fs_fs_type; 32 extern const struct address_space_operations v9fs_addr_operations; 33 extern const struct file_operations v9fs_file_operations; 34 extern const struct file_operations v9fs_file_operations_dotl; 35 extern const struct file_operations v9fs_dir_operations; 36 extern const struct file_operations v9fs_dir_operations_dotl; 37 extern const struct dentry_operations v9fs_dentry_operations; 38 extern const struct dentry_operations v9fs_cached_dentry_operations; 39 extern const struct file_operations v9fs_cached_file_operations; 40 extern const struct file_operations v9fs_cached_file_operations_dotl; 41 extern const struct file_operations v9fs_mmap_file_operations; 42 extern const struct file_operations v9fs_mmap_file_operations_dotl; 43 extern struct kmem_cache *v9fs_inode_cache; 44 45 struct inode *v9fs_alloc_inode(struct super_block *sb); 46 void v9fs_free_inode(struct inode *inode); 47 struct inode *v9fs_get_inode(struct super_block *sb, umode_t mode, dev_t); 48 int v9fs_init_inode(struct v9fs_session_info *v9ses, 49 struct inode *inode, umode_t mode, dev_t); 50 void v9fs_evict_inode(struct inode *inode); 51 ino_t v9fs_qid2ino(struct p9_qid *qid); 52 void v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode, 53 struct super_block *sb, unsigned int flags); 54 void v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode, 55 unsigned int flags); 56 int v9fs_dir_release(struct inode *inode, struct file *filp); 57 int v9fs_file_open(struct inode *inode, struct file *file); 58 void v9fs_inode2stat(struct inode *inode, struct p9_wstat *stat); 59 int v9fs_uflags2omode(int uflags, int extended); 60 61 void v9fs_blank_wstat(struct p9_wstat *wstat); 62 int v9fs_vfs_setattr_dotl(struct dentry *, struct iattr *); 63 int v9fs_file_fsync_dotl(struct file *filp, loff_t start, loff_t end, 64 int datasync); 65 int v9fs_refresh_inode(struct p9_fid *fid, struct inode *inode); 66 int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode); 67 static inline void v9fs_invalidate_inode_attr(struct inode *inode) 68 { 69 struct v9fs_inode *v9inode; 70 v9inode = V9FS_I(inode); 71 v9inode->cache_validity |= V9FS_INO_INVALID_ATTR; 72 return; 73 } 74 75 int v9fs_open_to_dotl_flags(int flags); 76 77 static inline void v9fs_i_size_write(struct inode *inode, loff_t i_size) 78 { 79 /* 80 * 32-bit need the lock, concurrent updates could break the 81 * sequences and make i_size_read() loop forever. 82 * 64-bit updates are atomic and can skip the locking. 83 */ 84 if (sizeof(i_size) > sizeof(long)) 85 spin_lock(&inode->i_lock); 86 i_size_write(inode, i_size); 87 if (sizeof(i_size) > sizeof(long)) 88 spin_unlock(&inode->i_lock); 89 } 90 #endif 91