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Diffstat (limited to 'fs/9p/v9fs_vfs.h')
| -rw-r--r-- | fs/9p/v9fs_vfs.h | 92 |
1 files changed, 92 insertions, 0 deletions
diff --git a/fs/9p/v9fs_vfs.h b/fs/9p/v9fs_vfs.h new file mode 100644 index 000000000..bc417da7e --- /dev/null +++ b/fs/9p/v9fs_vfs.h @@ -0,0 +1,92 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * V9FS VFS extensions. + * + * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com> + * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov> + */ +#ifndef FS_9P_V9FS_VFS_H +#define FS_9P_V9FS_VFS_H + +/* plan9 semantics are that created files are implicitly opened. + * But linux semantics are that you call create, then open. + * the plan9 approach is superior as it provides an atomic + * open. + * we track the create fid here. When the file is opened, if fidopen is + * non-zero, we use the fid and can skip some steps. + * there may be a better way to do this, but I don't know it. + * one BAD way is to clunk the fid on create, then open it again: + * you lose the atomicity of file open + */ + +/* special case: + * unlink calls remove, which is an implicit clunk. So we have to track + * that kind of thing so that we don't try to clunk a dead fid. + */ +#define P9_LOCK_TIMEOUT (30*HZ) + +/* flags for v9fs_stat2inode() & v9fs_stat2inode_dotl() */ +#define V9FS_STAT2INODE_KEEP_ISIZE 1 + +extern struct file_system_type v9fs_fs_type; +extern const struct address_space_operations v9fs_addr_operations; +extern const struct file_operations v9fs_file_operations; +extern const struct file_operations v9fs_file_operations_dotl; +extern const struct file_operations v9fs_dir_operations; +extern const struct file_operations v9fs_dir_operations_dotl; +extern const struct dentry_operations v9fs_dentry_operations; +extern const struct dentry_operations v9fs_cached_dentry_operations; +extern const struct file_operations v9fs_cached_file_operations; +extern const struct file_operations v9fs_cached_file_operations_dotl; +extern const struct file_operations v9fs_mmap_file_operations; +extern const struct file_operations v9fs_mmap_file_operations_dotl; +extern struct kmem_cache *v9fs_inode_cache; + +struct inode *v9fs_alloc_inode(struct super_block *sb); +void v9fs_free_inode(struct inode *inode); +struct inode *v9fs_get_inode(struct super_block *sb, umode_t mode, + dev_t rdev); +int v9fs_init_inode(struct v9fs_session_info *v9ses, + struct inode *inode, umode_t mode, dev_t rdev); +void v9fs_evict_inode(struct inode *inode); +ino_t v9fs_qid2ino(struct p9_qid *qid); +void v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode, + struct super_block *sb, unsigned int flags); +void v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode, + unsigned int flags); +int v9fs_dir_release(struct inode *inode, struct file *filp); +int v9fs_file_open(struct inode *inode, struct file *file); +void v9fs_inode2stat(struct inode *inode, struct p9_wstat *stat); +int v9fs_uflags2omode(int uflags, int extended); + +void v9fs_blank_wstat(struct p9_wstat *wstat); +int v9fs_vfs_setattr_dotl(struct user_namespace *mnt_userns, + struct dentry *dentry, struct iattr *iattr); +int v9fs_file_fsync_dotl(struct file *filp, loff_t start, loff_t end, + int datasync); +int v9fs_refresh_inode(struct p9_fid *fid, struct inode *inode); +int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode); +static inline void v9fs_invalidate_inode_attr(struct inode *inode) +{ + struct v9fs_inode *v9inode; + + v9inode = V9FS_I(inode); + v9inode->cache_validity |= V9FS_INO_INVALID_ATTR; +} + +int v9fs_open_to_dotl_flags(int flags); + +static inline void v9fs_i_size_write(struct inode *inode, loff_t i_size) +{ + /* + * 32-bit need the lock, concurrent updates could break the + * sequences and make i_size_read() loop forever. + * 64-bit updates are atomic and can skip the locking. + */ + if (sizeof(i_size) > sizeof(long)) + spin_lock(&inode->i_lock); + i_size_write(inode, i_size); + if (sizeof(i_size) > sizeof(long)) + spin_unlock(&inode->i_lock); +} +#endif |