Commit a325f9b9 authored by Tejun Heo's avatar Tejun Heo Committed by Miklos Szeredi
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fuse: update fuse_conn_init() and separate out fuse_conn_kill()



Update fuse_conn_init() such that it doesn't take @sb and move bdi
registration into a separate function.  Also separate out
fuse_conn_kill() from fuse_put_super().

These will be used to implement cuse.
Signed-off-by: default avatarTejun Heo <tj@kernel.org>
Signed-off-by: default avatarMiklos Szeredi <mszeredi@suse.cz>
parent 797759aa
......@@ -282,7 +282,7 @@ __releases(&fc->lock)
wake_up_all(&fc->blocked_waitq);
}
if (fc->num_background == FUSE_CONGESTION_THRESHOLD &&
fc->connected) {
fc->connected && fc->bdi_initialized) {
clear_bdi_congested(&fc->bdi, READ);
clear_bdi_congested(&fc->bdi, WRITE);
}
......@@ -408,7 +408,8 @@ static void fuse_request_send_nowait_locked(struct fuse_conn *fc,
fc->num_background++;
if (fc->num_background == FUSE_MAX_BACKGROUND)
fc->blocked = 1;
if (fc->num_background == FUSE_CONGESTION_THRESHOLD) {
if (fc->num_background == FUSE_CONGESTION_THRESHOLD &&
fc->bdi_initialized) {
set_bdi_congested(&fc->bdi, READ);
set_bdi_congested(&fc->bdi, WRITE);
}
......
......@@ -394,6 +394,9 @@ struct fuse_conn {
/** Filesystem supports NFS exporting. Only set in INIT */
unsigned export_support:1;
/** Set if bdi is valid */
unsigned bdi_initialized:1;
/*
* The following bitfields are only for optimization purposes
* and hence races in setting them will not cause malfunction
......@@ -662,7 +665,7 @@ struct fuse_conn *fuse_conn_get(struct fuse_conn *fc);
/**
* Initialize fuse_conn
*/
int fuse_conn_init(struct fuse_conn *fc, struct super_block *sb);
void fuse_conn_init(struct fuse_conn *fc);
/**
* Release reference to fuse_conn
......
......@@ -274,11 +274,14 @@ static void fuse_send_destroy(struct fuse_conn *fc)
}
}
static void fuse_put_super(struct super_block *sb)
static void fuse_bdi_destroy(struct fuse_conn *fc)
{
struct fuse_conn *fc = get_fuse_conn_super(sb);
if (fc->bdi_initialized)
bdi_destroy(&fc->bdi);
}
fuse_send_destroy(fc);
static void fuse_conn_kill(struct fuse_conn *fc)
{
spin_lock(&fc->lock);
fc->connected = 0;
fc->blocked = 0;
......@@ -292,7 +295,15 @@ static void fuse_put_super(struct super_block *sb)
list_del(&fc->entry);
fuse_ctl_remove_conn(fc);
mutex_unlock(&fuse_mutex);
bdi_destroy(&fc->bdi);
fuse_bdi_destroy(fc);
}
static void fuse_put_super(struct super_block *sb)
{
struct fuse_conn *fc = get_fuse_conn_super(sb);
fuse_send_destroy(fc);
fuse_conn_kill(fc);
fuse_conn_put(fc);
}
......@@ -463,10 +474,8 @@ static int fuse_show_options(struct seq_file *m, struct vfsmount *mnt)
return 0;
}
int fuse_conn_init(struct fuse_conn *fc, struct super_block *sb)
void fuse_conn_init(struct fuse_conn *fc)
{
int err;
memset(fc, 0, sizeof(*fc));
spin_lock_init(&fc->lock);
mutex_init(&fc->inst_mutex);
......@@ -481,49 +490,12 @@ int fuse_conn_init(struct fuse_conn *fc, struct super_block *sb)
INIT_LIST_HEAD(&fc->bg_queue);
INIT_LIST_HEAD(&fc->entry);
atomic_set(&fc->num_waiting, 0);
fc->bdi.ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_CACHE_SIZE;
fc->bdi.unplug_io_fn = default_unplug_io_fn;
/* fuse does it's own writeback accounting */
fc->bdi.capabilities = BDI_CAP_NO_ACCT_WB;
fc->khctr = 0;
fc->polled_files = RB_ROOT;
fc->dev = sb->s_dev;
err = bdi_init(&fc->bdi);
if (err)
goto error_mutex_destroy;
if (sb->s_bdev) {
err = bdi_register(&fc->bdi, NULL, "%u:%u-fuseblk",
MAJOR(fc->dev), MINOR(fc->dev));
} else {
err = bdi_register_dev(&fc->bdi, fc->dev);
}
if (err)
goto error_bdi_destroy;
/*
* For a single fuse filesystem use max 1% of dirty +
* writeback threshold.
*
* This gives about 1M of write buffer for memory maps on a
* machine with 1G and 10% dirty_ratio, which should be more
* than enough.
*
* Privileged users can raise it by writing to
*
* /sys/class/bdi/<bdi>/max_ratio
*/
bdi_set_max_ratio(&fc->bdi, 1);
fc->reqctr = 0;
fc->blocked = 1;
fc->attr_version = 1;
get_random_bytes(&fc->scramble_key, sizeof(fc->scramble_key));
return 0;
error_bdi_destroy:
bdi_destroy(&fc->bdi);
error_mutex_destroy:
mutex_destroy(&fc->inst_mutex);
return err;
}
EXPORT_SYMBOL_GPL(fuse_conn_init);
......@@ -794,6 +766,48 @@ static void fuse_free_conn(struct fuse_conn *fc)
kfree(fc);
}
static int fuse_bdi_init(struct fuse_conn *fc, struct super_block *sb)
{
int err;
fc->bdi.ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_CACHE_SIZE;
fc->bdi.unplug_io_fn = default_unplug_io_fn;
/* fuse does it's own writeback accounting */
fc->bdi.capabilities = BDI_CAP_NO_ACCT_WB;
err = bdi_init(&fc->bdi);
if (err)
return err;
fc->bdi_initialized = 1;
if (sb->s_bdev) {
err = bdi_register(&fc->bdi, NULL, "%u:%u-fuseblk",
MAJOR(fc->dev), MINOR(fc->dev));
} else {
err = bdi_register_dev(&fc->bdi, fc->dev);
}
if (err)
return err;
/*
* For a single fuse filesystem use max 1% of dirty +
* writeback threshold.
*
* This gives about 1M of write buffer for memory maps on a
* machine with 1G and 10% dirty_ratio, which should be more
* than enough.
*
* Privileged users can raise it by writing to
*
* /sys/class/bdi/<bdi>/max_ratio
*/
bdi_set_max_ratio(&fc->bdi, 1);
return 0;
}
static int fuse_fill_super(struct super_block *sb, void *data, int silent)
{
struct fuse_conn *fc;
......@@ -840,11 +854,12 @@ static int fuse_fill_super(struct super_block *sb, void *data, int silent)
if (!fc)
goto err_fput;
err = fuse_conn_init(fc, sb);
if (err) {
kfree(fc);
goto err_fput;
}
fuse_conn_init(fc);
fc->dev = sb->s_dev;
err = fuse_bdi_init(fc, sb);
if (err)
goto err_put_conn;
fc->release = fuse_free_conn;
fc->flags = d.flags;
......@@ -908,7 +923,7 @@ static int fuse_fill_super(struct super_block *sb, void *data, int silent)
err_put_root:
dput(root_dentry);
err_put_conn:
bdi_destroy(&fc->bdi);
fuse_bdi_destroy(fc);
fuse_conn_put(fc);
err_fput:
fput(file);
......
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