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91 lines
3.6 KiB
91 lines
3.6 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
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/* |
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* V9FS VFS extensions. |
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* |
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* Copyright (C) 2004 by Eric Van Hensbergen <[email protected]> |
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* Copyright (C) 2002 by Ron Minnich <[email protected]> |
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*/ |
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#ifndef FS_9P_V9FS_VFS_H |
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#define FS_9P_V9FS_VFS_H |
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/* plan9 semantics are that created files are implicitly opened. |
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* But linux semantics are that you call create, then open. |
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* the plan9 approach is superior as it provides an atomic |
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* open. |
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* we track the create fid here. When the file is opened, if fidopen is |
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* non-zero, we use the fid and can skip some steps. |
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* there may be a better way to do this, but I don't know it. |
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* one BAD way is to clunk the fid on create, then open it again: |
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* you lose the atomicity of file open |
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*/ |
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/* special case: |
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* unlink calls remove, which is an implicit clunk. So we have to track |
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* that kind of thing so that we don't try to clunk a dead fid. |
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*/ |
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#define P9_LOCK_TIMEOUT (30*HZ) |
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/* flags for v9fs_stat2inode() & v9fs_stat2inode_dotl() */ |
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#define V9FS_STAT2INODE_KEEP_ISIZE 1 |
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extern struct file_system_type v9fs_fs_type; |
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extern const struct address_space_operations v9fs_addr_operations; |
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extern const struct file_operations v9fs_file_operations; |
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extern const struct file_operations v9fs_file_operations_dotl; |
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extern const struct file_operations v9fs_dir_operations; |
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extern const struct file_operations v9fs_dir_operations_dotl; |
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extern const struct dentry_operations v9fs_dentry_operations; |
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extern const struct dentry_operations v9fs_cached_dentry_operations; |
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extern const struct file_operations v9fs_cached_file_operations; |
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extern const struct file_operations v9fs_cached_file_operations_dotl; |
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extern const struct file_operations v9fs_mmap_file_operations; |
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extern const struct file_operations v9fs_mmap_file_operations_dotl; |
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extern struct kmem_cache *v9fs_inode_cache; |
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struct inode *v9fs_alloc_inode(struct super_block *sb); |
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void v9fs_free_inode(struct inode *inode); |
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struct inode *v9fs_get_inode(struct super_block *sb, umode_t mode, dev_t); |
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int v9fs_init_inode(struct v9fs_session_info *v9ses, |
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struct inode *inode, umode_t mode, dev_t); |
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void v9fs_evict_inode(struct inode *inode); |
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ino_t v9fs_qid2ino(struct p9_qid *qid); |
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void v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode, |
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struct super_block *sb, unsigned int flags); |
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void v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode, |
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unsigned int flags); |
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int v9fs_dir_release(struct inode *inode, struct file *filp); |
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int v9fs_file_open(struct inode *inode, struct file *file); |
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void v9fs_inode2stat(struct inode *inode, struct p9_wstat *stat); |
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int v9fs_uflags2omode(int uflags, int extended); |
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void v9fs_blank_wstat(struct p9_wstat *wstat); |
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int v9fs_vfs_setattr_dotl(struct user_namespace *, struct dentry *, |
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struct iattr *); |
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int v9fs_file_fsync_dotl(struct file *filp, loff_t start, loff_t end, |
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int datasync); |
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int v9fs_refresh_inode(struct p9_fid *fid, struct inode *inode); |
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int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode); |
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static inline void v9fs_invalidate_inode_attr(struct inode *inode) |
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{ |
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struct v9fs_inode *v9inode; |
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v9inode = V9FS_I(inode); |
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v9inode->cache_validity |= V9FS_INO_INVALID_ATTR; |
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return; |
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} |
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int v9fs_open_to_dotl_flags(int flags); |
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static inline void v9fs_i_size_write(struct inode *inode, loff_t i_size) |
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{ |
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/* |
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* 32-bit need the lock, concurrent updates could break the |
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* sequences and make i_size_read() loop forever. |
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* 64-bit updates are atomic and can skip the locking. |
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*/ |
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if (sizeof(i_size) > sizeof(long)) |
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spin_lock(&inode->i_lock); |
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i_size_write(inode, i_size); |
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if (sizeof(i_size) > sizeof(long)) |
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spin_unlock(&inode->i_lock); |
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} |
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#endif
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