unsigned int for_kupdate:1;
unsigned int range_cyclic:1;
unsigned int for_background:1;
- unsigned int sb_pinned:1;
};
/*
}
static void bdi_alloc_queue_work(struct backing_dev_info *bdi,
- struct wb_writeback_args *args,
- int wait)
+ struct wb_writeback_args *args)
{
struct bdi_work *work;
if (work) {
bdi_work_init(work, args);
bdi_queue_work(bdi, work);
- if (wait)
- bdi_wait_on_work_clear(work);
} else {
struct bdi_writeback *wb = &bdi->wb;
.sync_mode = WB_SYNC_ALL,
.nr_pages = LONG_MAX,
.range_cyclic = 0,
- /*
- * Setting sb_pinned is not necessary for WB_SYNC_ALL, but
- * lets make it explicitly clear.
- */
- .sb_pinned = 1,
};
struct bdi_work work;
* @bdi: the backing device to write from
* @sb: write inodes from this super_block
* @nr_pages: the number of pages to write
- * @sb_locked: caller already holds sb umount sem.
*
* Description:
* This does WB_SYNC_NONE opportunistic writeback. The IO is only
* started when this function returns, we make no guarentees on
- * completion. Caller specifies whether sb umount sem is held already or not.
+ * completion. Caller need not hold sb s_umount semaphore.
*
*/
void bdi_start_writeback(struct backing_dev_info *bdi, struct super_block *sb,
- long nr_pages, int sb_locked)
+ long nr_pages)
{
struct wb_writeback_args args = {
.sb = sb,
.sync_mode = WB_SYNC_NONE,
.nr_pages = nr_pages,
.range_cyclic = 1,
- .sb_pinned = sb_locked,
};
/*
args.for_background = 1;
}
- bdi_alloc_queue_work(bdi, &args, sb_locked);
+ bdi_alloc_queue_work(bdi, &args);
}
/*
wait_queue_head_t *wqh;
wqh = bit_waitqueue(&inode->i_state, __I_SYNC);
- do {
+ while (inode->i_state & I_SYNC) {
spin_unlock(&inode_lock);
__wait_on_bit(wqh, &wq, inode_wait, TASK_UNINTERRUPTIBLE);
spin_lock(&inode_lock);
- } while (inode->i_state & I_SYNC);
+ }
}
/*
/*
* Caller must already hold the ref for this
*/
- if (wbc->sync_mode == WB_SYNC_ALL || wbc->sb_pinned) {
+ if (wbc->sync_mode == WB_SYNC_ALL) {
WARN_ON(!rwsem_is_locked(&sb->s_umount));
return SB_NOT_PINNED;
}
.for_kupdate = args->for_kupdate,
.for_background = args->for_background,
.range_cyclic = args->range_cyclic,
- .sb_pinned = args->sb_pinned,
};
unsigned long oldest_jif;
long wrote = 0;
while ((work = get_next_work_item(bdi, wb)) != NULL) {
struct wb_writeback_args args = work->args;
- int post_clear;
/*
* Override sync mode, in case we must wait for completion
if (force_wait)
work->args.sync_mode = args.sync_mode = WB_SYNC_ALL;
- post_clear = WB_SYNC_ALL || args.sb_pinned;
-
/*
* If this isn't a data integrity operation, just notify
* that we have seen this work and we are now starting it.
*/
- if (!post_clear)
+ if (args.sync_mode == WB_SYNC_NONE)
wb_clear_pending(wb, work);
wrote += wb_writeback(wb, &args);
* This is a data integrity writeback, so only do the
* notification when we have completed the work.
*/
- if (post_clear)
+ if (args.sync_mode == WB_SYNC_ALL)
wb_clear_pending(wb, work);
}
if (!bdi_has_dirty_io(bdi))
continue;
- bdi_alloc_queue_work(bdi, &args, 0);
+ bdi_alloc_queue_work(bdi, &args);
}
rcu_read_unlock();
iput(old_inode);
}
-static void __writeback_inodes_sb(struct super_block *sb, int sb_locked)
-{
- unsigned long nr_dirty = global_page_state(NR_FILE_DIRTY);
- unsigned long nr_unstable = global_page_state(NR_UNSTABLE_NFS);
- long nr_to_write;
-
- nr_to_write = nr_dirty + nr_unstable +
- (inodes_stat.nr_inodes - inodes_stat.nr_unused);
-
- bdi_start_writeback(sb->s_bdi, sb, nr_to_write, sb_locked);
-}
-
/**
* writeback_inodes_sb - writeback dirty inodes from given super_block
* @sb: the superblock
*/
void writeback_inodes_sb(struct super_block *sb)
{
- __writeback_inodes_sb(sb, 0);
-}
-EXPORT_SYMBOL(writeback_inodes_sb);
+ unsigned long nr_dirty = global_page_state(NR_FILE_DIRTY);
+ unsigned long nr_unstable = global_page_state(NR_UNSTABLE_NFS);
+ long nr_to_write;
-/**
- * writeback_inodes_sb_locked - writeback dirty inodes from given super_block
- * @sb: the superblock
- *
- * Like writeback_inodes_sb(), except the caller already holds the
- * sb umount sem.
- */
-void writeback_inodes_sb_locked(struct super_block *sb)
-{
- __writeback_inodes_sb(sb, 1);
+ nr_to_write = nr_dirty + nr_unstable +
+ (inodes_stat.nr_inodes - inodes_stat.nr_unused);
+
+ bdi_start_writeback(sb->s_bdi, sb, nr_to_write);
}
+EXPORT_SYMBOL(writeback_inodes_sb);
/**
* writeback_inodes_sb_if_idle - start writeback if none underway
return kmap(buf->page);
}
+ EXPORT_SYMBOL(generic_pipe_buf_map);
/**
* generic_pipe_buf_unmap - unmap a previously mapped pipe buffer
} else
kunmap(buf->page);
}
+ EXPORT_SYMBOL(generic_pipe_buf_unmap);
/**
* generic_pipe_buf_steal - attempt to take ownership of a &pipe_buffer
return 1;
}
+ EXPORT_SYMBOL(generic_pipe_buf_steal);
/**
* generic_pipe_buf_get - get a reference to a &struct pipe_buffer
{
page_cache_get(buf->page);
}
+ EXPORT_SYMBOL(generic_pipe_buf_get);
/**
* generic_pipe_buf_confirm - verify contents of the pipe buffer
{
return 0;
}
+ EXPORT_SYMBOL(generic_pipe_buf_confirm);
/**
* generic_pipe_buf_release - put a reference to a &struct pipe_buffer
{
page_cache_release(buf->page);
}
+ EXPORT_SYMBOL(generic_pipe_buf_release);
static const struct pipe_buf_operations anon_pipe_buf_ops = {
.can_merge = 1,
* Allocate a new array of pipe buffers and copy the info over. Returns the
* pipe size if successful, or return -ERROR on error.
*/
-static long pipe_set_size(struct pipe_inode_info *pipe, unsigned long arg)
+static long pipe_set_size(struct pipe_inode_info *pipe, unsigned long nr_pages)
{
struct pipe_buffer *bufs;
/*
- * Must be a power-of-2 currently
- */
- if (!is_power_of_2(arg))
- return -EINVAL;
-
- /*
* We can shrink the pipe, if arg >= pipe->nrbufs. Since we don't
* expect a lot of shrink+grow operations, just free and allocate
* again like we would do for growing. If the pipe currently
* contains more buffers than arg, then return busy.
*/
- if (arg < pipe->nrbufs)
+ if (nr_pages < pipe->nrbufs)
return -EBUSY;
- bufs = kcalloc(arg, sizeof(struct pipe_buffer), GFP_KERNEL);
+ bufs = kcalloc(nr_pages, sizeof(struct pipe_buffer), GFP_KERNEL);
if (unlikely(!bufs))
return -ENOMEM;
pipe->curbuf = 0;
kfree(pipe->bufs);
pipe->bufs = bufs;
- pipe->buffers = arg;
- return arg;
+ pipe->buffers = nr_pages;
+ return nr_pages * PAGE_SIZE;
}
long pipe_fcntl(struct file *file, unsigned int cmd, unsigned long arg)
mutex_lock(&pipe->inode->i_mutex);
switch (cmd) {
- case F_SETPIPE_SZ:
- if (!capable(CAP_SYS_ADMIN) && arg > pipe_max_pages) {
- ret = -EINVAL;
+ case F_SETPIPE_SZ: {
+ unsigned long nr_pages;
+
+ /*
+ * Currently the array must be a power-of-2 size, so adjust
+ * upwards if needed.
+ */
+ nr_pages = (arg + PAGE_SIZE - 1) >> PAGE_SHIFT;
+ nr_pages = roundup_pow_of_two(nr_pages);
+
- if (!capable(CAP_SYS_ADMIN) && nr_pages > pipe_max_pages)
- return -EPERM;
++ if (!capable(CAP_SYS_ADMIN) && nr_pages > pipe_max_pages) {
++ ret = -EPERM;
+ goto out;
+ }
+
/*
* The pipe needs to be at least 2 pages large to
* guarantee POSIX behaviour.
*/
- if (nr_pages < 2)
- return -EINVAL;
- ret = pipe_set_size(pipe, nr_pages);
+ if (arg < 2) {
+ ret = -EINVAL;
+ goto out;
+ }
+ ret = pipe_set_size(pipe, arg);
break;
+ }
case F_GETPIPE_SZ:
- ret = pipe->buffers;
+ ret = pipe->buffers * PAGE_SIZE;
break;
default:
ret = -EINVAL;
break;
}
+ out:
mutex_unlock(&pipe->inode->i_mutex);
return ret;
}
git://ftp.safe.ca / safe / jmp / linux-2.6 / commitdiff