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       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                 :          0 : static inline void v9fs_invalidate_inode_attr(struct inode *inode)
      68                 :            : {
      69                 :          0 :         struct v9fs_inode *v9inode;
      70   [ #  #  #  # ]:          0 :         v9inode = V9FS_I(inode);
      71                 :          0 :         v9inode->cache_validity |= V9FS_INO_INVALID_ATTR;
      72   [ #  #  #  # ]:          0 :         return;
      73                 :            : }
      74                 :            : 
      75                 :            : int v9fs_open_to_dotl_flags(int flags);
      76                 :            : 
      77                 :          0 : 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                 :          0 :         if (sizeof(i_size) > sizeof(long))
      85                 :            :                 spin_lock(&inode->i_lock);
      86                 :          0 :         i_size_write(inode, i_size);
      87                 :          0 :         if (sizeof(i_size) > sizeof(long))
      88                 :            :                 spin_unlock(&inode->i_lock);
      89                 :          0 : }
      90                 :            : #endif