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, 48 dev_t rdev); 49 int v9fs_init_inode(struct v9fs_session_info *v9ses, 50 struct inode *inode, umode_t mode, dev_t rdev); 51 void v9fs_evict_inode(struct inode *inode); 52 ino_t v9fs_qid2ino(struct p9_qid *qid); 53 void v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode, 54 struct super_block *sb, unsigned int flags); 55 void v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode, 56 unsigned int flags); 57 int v9fs_dir_release(struct inode *inode, struct file *filp); 58 int v9fs_file_open(struct inode *inode, struct file *file); 59 void v9fs_inode2stat(struct inode *inode, struct p9_wstat *stat); 60 int v9fs_uflags2omode(int uflags, int extended); 61 62 void v9fs_blank_wstat(struct p9_wstat *wstat); 63 int v9fs_vfs_setattr_dotl(struct user_namespace *mnt_userns, 64 struct dentry *dentry, struct iattr *iattr); 65 int v9fs_file_fsync_dotl(struct file *filp, loff_t start, loff_t end, 66 int datasync); 67 int v9fs_refresh_inode(struct p9_fid *fid, struct inode *inode); 68 int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode); 69 static inline void v9fs_invalidate_inode_attr(struct inode *inode) 70 { 71 struct v9fs_inode *v9inode; 72 73 v9inode = V9FS_I(inode); 74 v9inode->cache_validity |= V9FS_INO_INVALID_ATTR; 75 } 76 77 int v9fs_open_to_dotl_flags(int flags); 78 79 static inline void v9fs_i_size_write(struct inode *inode, loff_t i_size) 80 { 81 /* 82 * 32-bit need the lock, concurrent updates could break the 83 * sequences and make i_size_read() loop forever. 84 * 64-bit updates are atomic and can skip the locking. 85 */ 86 if (sizeof(i_size) > sizeof(long)) 87 spin_lock(&inode->i_lock); 88 i_size_write(inode, i_size); 89 if (sizeof(i_size) > sizeof(long)) 90 spin_unlock(&inode->i_lock); 91 } 92 #endif 93