While cacheing is generally frowned upon in the 9p world, it has its
place -- particularly in situations where the remote file system is
exclusive and/or read-only. The vacfs views of venti content addressable
store are a real-world instance of such a situation. To facilitate higher
performance for these workloads (and eventually use the fscache patches),
we have enabled a "loose" cache mode which does not attempt to maintain
any form of consistency on the page-cache or dcache. This results in over
two orders of magnitude performance improvement for cacheable block reads
in the Bonnie benchmark. The more aggressive use of the dcache also seems
to improve metadata operational performance.
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
- explanation of how to make filesystems exportable.
Locking
- info on locking rules as they pertain to Linux VFS.
- explanation of how to make filesystems exportable.
Locking
- info on locking rules as they pertain to Linux VFS.
+9p.txt
+ - 9p (v9fs) is an implementation of the Plan 9 remote fs protocol.
adfs.txt
- info and mount options for the Acorn Advanced Disc Filing System.
afs.txt
adfs.txt
- info and mount options for the Acorn Advanced Disc Filing System.
afs.txt
- info and mount options for the UDF filesystem.
ufs.txt
- info on the ufs filesystem.
- info and mount options for the UDF filesystem.
ufs.txt
- info on the ufs filesystem.
-v9fs.txt
- - v9fs is a Unix implementation of the Plan 9 9p remote fs protocol.
vfat.txt
- info on using the VFAT filesystem used in Windows NT and Windows 95
vfs.txt
vfat.txt
- info on using the VFAT filesystem used in Windows NT and Windows 95
vfs.txt
aname=name aname specifies the file tree to access when the server is
offering several exported file systems.
aname=name aname specifies the file tree to access when the server is
offering several exported file systems.
+ cache=mode specifies a cacheing policy. By default, no caches are used.
+ loose = no attempts are made at consistency,
+ intended for exclusive, read-only mounts
+
debug=n specifies debug level. The debug level is a bitmask.
0x01 = display verbose error messages
0x02 = developer debug (DEBUG_CURRENT)
debug=n specifies debug level. The debug level is a bitmask.
0x01 = display verbose error messages
0x02 = developer debug (DEBUG_CURRENT)
- * v9fs_fid_clone - lookup the fid for a dentry, clone a private copy and release it
+ * v9fs_fid_clone - lookup the fid for a dentry, clone a private copy and
+ * release it
* @dentry: dentry to look for fid in
*
* find a fid in the dentry and then clone to a new private fid
* @dentry: dentry to look for fid in
*
* find a fid in the dentry and then clone to a new private fid
Opt_uname, Opt_remotename,
/* Options that take no arguments */
Opt_legacy, Opt_nodevmap, Opt_unix, Opt_tcp, Opt_fd,
Opt_uname, Opt_remotename,
/* Options that take no arguments */
Opt_legacy, Opt_nodevmap, Opt_unix, Opt_tcp, Opt_fd,
+ /* Cache options */
+ Opt_cache_loose,
/* Error token */
Opt_err
};
/* Error token */
Opt_err
};
{Opt_fd, "fd"},
{Opt_legacy, "noextend"},
{Opt_nodevmap, "nodevmap"},
{Opt_fd, "fd"},
{Opt_legacy, "noextend"},
{Opt_nodevmap, "nodevmap"},
+ {Opt_cache_loose, "cache=loose"},
+ {Opt_cache_loose, "loose"},
v9ses->debug = 0;
v9ses->rfdno = ~0;
v9ses->wfdno = ~0;
v9ses->debug = 0;
v9ses->rfdno = ~0;
v9ses->wfdno = ~0;
"integer field, but no integer?\n");
continue;
}
"integer field, but no integer?\n");
continue;
}
}
switch (token) {
case Opt_port:
}
switch (token) {
case Opt_port:
case Opt_nodevmap:
v9ses->nodev = 1;
break;
case Opt_nodevmap:
v9ses->nodev = 1;
break;
+ case Opt_cache_loose:
+ v9ses->cache = CACHE_LOOSE;
+ break;
unsigned int afid; /* authentication fid */
unsigned int rfdno; /* read file descriptor number */
unsigned int wfdno; /* write file descriptor number */
unsigned int afid; /* authentication fid */
unsigned int rfdno; /* read file descriptor number */
unsigned int wfdno; /* write file descriptor number */
+ unsigned int cache; /* cache mode */
char *name; /* user name to mount as */
char *remotename; /* name of remote hierarchy being mounted */
char *name; /* user name to mount as */
char *remotename; /* name of remote hierarchy being mounted */
+/* possible values of ->cache */
+/* eventually support loose, tight, time, session, default always none */
+enum {
+ CACHE_NONE, /* default */
+ CACHE_LOOSE, /* no consistency */
+};
+
extern struct dentry *v9fs_debugfs_root;
int v9fs_session_init(struct v9fs_session_info *, const char *, char *);
extern struct dentry *v9fs_debugfs_root;
int v9fs_session_init(struct v9fs_session_info *, const char *, char *);
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 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_cached_file_operations;
extern const struct file_operations v9fs_dir_operations;
extern struct dentry_operations v9fs_dentry_operations;
extern const struct file_operations v9fs_dir_operations;
extern struct dentry_operations v9fs_dentry_operations;
+extern struct dentry_operations v9fs_cached_dentry_operations;
struct inode *v9fs_get_inode(struct super_block *sb, int mode);
ino_t v9fs_qid2ino(struct v9fs_qid *qid);
struct inode *v9fs_get_inode(struct super_block *sb, int mode);
ino_t v9fs_qid2ino(struct v9fs_qid *qid);
int total = 0;
int result = 0;
int total = 0;
int result = 0;
+ dprintk(DEBUG_VFS, "\n");
+
buffer = kmap(page);
do {
if (count < rsize)
buffer = kmap(page);
do {
if (count < rsize)
static int v9fs_dentry_delete(struct dentry *dentry)
{
dprintk(DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_iname, dentry);
static int v9fs_dentry_delete(struct dentry *dentry)
{
dprintk(DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_iname, dentry);
+ * v9fs_cached_dentry_delete - called when dentry refcount equals 0
+ * @dentry: dentry in question
+ *
+ * Only return 1 if our inode is invalid. Only non-synthetic files
+ * (ones without mtime == 0) should be calling this function.
+ *
+ */
+
+static int v9fs_cached_dentry_delete(struct dentry *dentry)
+{
+ struct inode *inode = dentry->d_inode;
+ dprintk(DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_iname, dentry);
+
+ if(!inode)
+ return 1;
+
+ return 0;
+}
+
+/**
* v9fs_dentry_release - called when dentry is going to be freed
* @dentry: dentry that is being release
*
* v9fs_dentry_release - called when dentry is going to be freed
* @dentry: dentry that is being release
*
+struct dentry_operations v9fs_cached_dentry_operations = {
+ .d_delete = v9fs_cached_dentry_delete,
+ .d_release = v9fs_dentry_release,
+};
+
struct dentry_operations v9fs_dentry_operations = {
.d_delete = v9fs_dentry_delete,
.d_release = v9fs_dentry_release,
struct dentry_operations v9fs_dentry_operations = {
.d_delete = v9fs_dentry_delete,
.d_release = v9fs_dentry_release,
vfid->filp = file;
kfree(fcall);
vfid->filp = file;
kfree(fcall);
+ if((vfid->qid.version) && (v9ses->cache)) {
+ dprintk(DEBUG_VFS, "cached");
+ /* enable cached file options */
+ if(file->f_op == &v9fs_file_operations)
+ file->f_op = &v9fs_cached_file_operations;
+ }
+
+const struct file_operations v9fs_cached_file_operations = {
+ .llseek = generic_file_llseek,
+ .read = do_sync_read,
+ .aio_read = generic_file_aio_read,
+ .write = v9fs_file_write,
+ .open = v9fs_file_open,
+ .release = v9fs_dir_release,
+ .lock = v9fs_file_lock,
+ .mmap = generic_file_mmap,
+};
+
const struct file_operations v9fs_file_operations = {
.llseek = generic_file_llseek,
.read = v9fs_file_read,
const struct file_operations v9fs_file_operations = {
.llseek = generic_file_llseek,
.read = v9fs_file_read,
- dentry->d_op = &v9fs_dentry_operations;
+ if(v9ses->cache)
+ dentry->d_op = &v9fs_cached_dentry_operations;
+ else
+ dentry->d_op = &v9fs_dentry_operations;
d_instantiate(dentry, inode);
if (nd && nd->flags & LOOKUP_OPEN) {
d_instantiate(dentry, inode);
if (nd && nd->flags & LOOKUP_OPEN) {
- dentry->d_op = &v9fs_dentry_operations;
+ if(v9ses->cache)
+ dentry->d_op = &v9fs_cached_dentry_operations;
+ else
+ dentry->d_op = &v9fs_dentry_operations;
d_instantiate(dentry, inode);
return 0;
d_instantiate(dentry, inode);
return 0;
sb = dir->i_sb;
v9ses = v9fs_inode2v9ses(dir);
sb = dir->i_sb;
v9ses = v9fs_inode2v9ses(dir);
- dentry->d_op = &v9fs_dentry_operations;
dirfid = v9fs_fid_lookup(dentry->d_parent);
if(IS_ERR(dirfid))
dirfid = v9fs_fid_lookup(dentry->d_parent);
if(IS_ERR(dirfid))
fid->qid = fcall->params.rstat.stat.qid;
v9fs_stat2inode(&fcall->params.rstat.stat, inode, inode->i_sb);
fid->qid = fcall->params.rstat.stat.qid;
v9fs_stat2inode(&fcall->params.rstat.stat, inode, inode->i_sb);
+ if((fid->qid.version)&&(v9ses->cache))
+ dentry->d_op = &v9fs_cached_dentry_operations;
+ else
+ dentry->d_op = &v9fs_dentry_operations;
d_add(dentry, inode);
kfree(fcall);
d_add(dentry, inode);
kfree(fcall);
- dentry->d_op = &v9fs_dentry_operations;
+ if(v9ses->cache)
+ dentry->d_op = &v9fs_cached_dentry_operations;
+ else
+ dentry->d_op = &v9fs_dentry_operations;
d_instantiate(dentry, inode);
return 0;
d_instantiate(dentry, inode);
return 0;