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Commit 0fe2f1e9 authored by Steven Whitehouse's avatar Steven Whitehouse
Browse files

GFS2: Size seq_file buffer more carefully 



This places a limit on the buffer size for archs with larger
PAGE_SIZE.

Signed-off-by: default avatarSteven Whitehouse <swhiteho@redhat.com>
Reported-by: default avatarEric Dumazet <eric.dumazet@gmail.com>
parent 1bb49303

fs/gfs2/glock.c

+6 −4
Original line number Diff line number Diff line
@@ -1977,6 +1977,8 @@ static const struct seq_operations gfs2_sbstats_seq_ops = { 
	.show  = gfs2_sbstats_seq_show,

};



#define GFS2_SEQ_GOODSIZE min(PAGE_SIZE << PAGE_ALLOC_COSTLY_ORDER, 65536UL)



static int gfs2_glocks_open(struct inode *inode, struct file *file)

{

	int ret = seq_open_private(file, &gfs2_glock_seq_ops,
@@ -1985,9 +1987,9 @@ static int gfs2_glocks_open(struct inode *inode, struct file *file) 
		struct seq_file *seq = file->private_data;

		struct gfs2_glock_iter *gi = seq->private;

		gi->sdp = inode->i_private;

		seq->buf = kmalloc(8*PAGE_SIZE, GFP_KERNEL | __GFP_NOWARN);

		seq->buf = kmalloc(GFS2_SEQ_GOODSIZE, GFP_KERNEL | __GFP_NOWARN);

		if (seq->buf)

			seq->size = 8*PAGE_SIZE;

			seq->size = GFS2_SEQ_GOODSIZE;

	}

	return ret;

}
@@ -2000,9 +2002,9 @@ static int gfs2_glstats_open(struct inode *inode, struct file *file) 
		struct seq_file *seq = file->private_data;

		struct gfs2_glock_iter *gi = seq->private;

		gi->sdp = inode->i_private;

		seq->buf = kmalloc(8*PAGE_SIZE, GFP_KERNEL | __GFP_NOWARN);

		seq->buf = kmalloc(GFS2_SEQ_GOODSIZE, GFP_KERNEL | __GFP_NOWARN);

		if (seq->buf)

			seq->size = 8*PAGE_SIZE;

			seq->size = GFS2_SEQ_GOODSIZE;

	}

	return ret;

}