| b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame] | 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 |