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authorSteven Whitehouse <swhiteho@redhat.com>2012-06-11 13:49:47 +0100
committerSteven Whitehouse <swhiteho@redhat.com>2012-06-11 13:49:47 +0100
commit0fe2f1e929ecabf834f4af2ffd300fe70700f4b3 (patch)
tree4f885ec0bc860bef382f50b4261c01a1d589efda /fs/gfs2/glock.c
parent1bb49303b7a82eb9bce0595087523343683abdf0 (diff)
GFS2: Size seq_file buffer more carefully
This places a limit on the buffer size for archs with larger PAGE_SIZE. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com> Reported-by: Eric Dumazet <eric.dumazet@gmail.com>
Diffstat (limited to 'fs/gfs2/glock.c')
-rw-r--r--fs/gfs2/glock.c10
1 files changed, 6 insertions, 4 deletions
diff --git a/fs/gfs2/glock.c b/fs/gfs2/glock.c
index 4d5d63d9d2c..1ed81f40da0 100644
--- a/fs/gfs2/glock.c
+++ b/fs/gfs2/glock.c
@@ -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;
}