106 lines
4.1 KiB
C
106 lines
4.1 KiB
C
/*
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* V9FS VFS extensions.
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*
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* Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
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* Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to:
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* Free Software Foundation
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* 51 Franklin Street, Fifth Floor
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* Boston, MA 02111-1301 USA
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*
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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_destroy_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 dentry *, 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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