b3cbea03b4
With cached mode some of the file system operation result in updating inode attributes (ctime). Add support for marking inode attribute invalid in such cases so that we fetch the updated inode attribute on dentry revalidation. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
83 lines
3.6 KiB
C
83 lines
3.6 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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/* 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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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 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, int mode);
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int v9fs_init_inode(struct v9fs_session_info *v9ses,
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struct inode *inode, int mode);
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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 *, struct inode *, struct super_block *);
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void v9fs_stat2inode_dotl(struct p9_stat_dotl *, struct inode *);
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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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ssize_t v9fs_file_readn(struct file *, char *, char __user *, u32, u64);
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ssize_t v9fs_fid_readn(struct p9_fid *, char *, char __user *, u32, u64);
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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, int datasync);
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ssize_t v9fs_file_write_internal(struct inode *, struct p9_fid *,
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const char __user *, size_t, loff_t *, int);
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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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#define P9_LOCK_TIMEOUT (30*HZ)
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