mirror of
https://github.com/torvalds/linux.git
synced 2024-11-27 06:31:52 +00:00
9546ac78b2
The 9p filesystem is calling netfs_inode_init() in v9fs_init_inode() - before the struct inode fields have been initialised from the obtained file stats (ie. after v9fs_stat2inode*() has been called), but netfslib wants to set a couple of its fields from i_size. Reported-by: Marc Dionne <marc.dionne@auristor.com> Signed-off-by: David Howells <dhowells@redhat.com> Tested-by: Marc Dionne <marc.dionne@auristor.com> Tested-by: Dominique Martinet <asmadeus@codewreck.org> Acked-by: Dominique Martinet <asmadeus@codewreck.org> cc: Eric Van Hensbergen <ericvh@kernel.org> cc: Latchesar Ionkov <lucho@ionkov.net> cc: Dominique Martinet <asmadeus@codewreck.org> cc: Christian Schoenebeck <linux_oss@crudebyte.com> cc: v9fs@lists.linux.dev cc: linux-cachefs@redhat.com cc: linux-fsdevel@vger.kernel.org
89 lines
3.3 KiB
C
89 lines
3.3 KiB
C
/* 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 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);
|
|
void v9fs_set_netfs_context(struct inode *inode);
|
|
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);
|
|
int v9fs_uflags2omode(int uflags, int extended);
|
|
|
|
void v9fs_blank_wstat(struct p9_wstat *wstat);
|
|
int v9fs_vfs_setattr_dotl(struct mnt_idmap *idmap,
|
|
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
|