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[S390] monwriter buffer limit.

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Make max_bufs a global (per linux guest) limit.

Signed-off-by: Melissa Howland <melissah@us.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Melissa Howland
2006-10-06 16:38:26 +02:00
committed by Martin Schwidefsky
parent d83682b397
commit 2d103d5a80
1 changed files with 5 additions and 5 deletions
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10
drivers/s390/char/monwriter.c
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@@ -26,6 +26,7 @@
#define MONWRITE_MAX_DATALEN 4024 #define MONWRITE_MAX_DATALEN 4024
static int mon_max_bufs = 255; static int mon_max_bufs = 255;
static int mon_buf_count;
struct mon_buf { struct mon_buf {
struct list_head list; struct list_head list;
@@ -40,7 +41,6 @@ struct mon_private {
size_t hdr_to_read; size_t hdr_to_read;
size_t data_to_read; size_t data_to_read;
struct mon_buf *current_buf; struct mon_buf *current_buf;
int mon_buf_count;
}; };
/* /*
@@ -99,13 +99,13 @@ static int monwrite_new_hdr(struct mon_private *monpriv)
rc = monwrite_diag(monhdr, monbuf->data, rc = monwrite_diag(monhdr, monbuf->data,
APPLDATA_STOP_REC); APPLDATA_STOP_REC);
list_del(&monbuf->list); list_del(&monbuf->list);
monpriv->mon_buf_count--; mon_buf_count--;
kfree(monbuf->data); kfree(monbuf->data);
kfree(monbuf); kfree(monbuf);
monbuf = NULL; monbuf = NULL;
} }
} else { } else {
if (monpriv->mon_buf_count >= mon_max_bufs) if (mon_buf_count >= mon_max_bufs)
return -ENOSPC; return -ENOSPC;
monbuf = kzalloc(sizeof(struct mon_buf), GFP_KERNEL); monbuf = kzalloc(sizeof(struct mon_buf), GFP_KERNEL);
if (!monbuf) if (!monbuf)
@@ -118,7 +118,7 @@ static int monwrite_new_hdr(struct mon_private *monpriv)
} }
monbuf->hdr = *monhdr; monbuf->hdr = *monhdr;
list_add_tail(&monbuf->list, &monpriv->list); list_add_tail(&monbuf->list, &monpriv->list);
monpriv->mon_buf_count++; mon_buf_count++;
} }
monpriv->current_buf = monbuf; monpriv->current_buf = monbuf;
return 0; return 0;
@@ -186,7 +186,7 @@ static int monwrite_close(struct inode *inode, struct file *filp)
if (entry->hdr.mon_function != MONWRITE_GEN_EVENT) if (entry->hdr.mon_function != MONWRITE_GEN_EVENT)
monwrite_diag(&entry->hdr, entry->data, monwrite_diag(&entry->hdr, entry->data,
APPLDATA_STOP_REC); APPLDATA_STOP_REC);
monpriv->mon_buf_count--; mon_buf_count--;
list_del(&entry->list); list_del(&entry->list);
kfree(entry->data); kfree(entry->data);
kfree(entry); kfree(entry);