X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=fs%2Ffile.c;h=7b3887e054d0bcb5e0e187c8e1e42691c4fadcd0;hb=479798211967cd828e09ce27775b8cbfe99462ab;hp=689d2b6947e3e2da5dabf76d7e8512186b4eec40;hpb=afbec7fff4928c273a1f1bb14dfdfdf62688a193;p=linux-2.6

diff --git a/fs/file.c b/fs/file.c
index 689d2b6947..7b3887e054 100644
--- a/fs/file.c
+++ b/fs/file.c
@@ -26,6 +26,8 @@ struct fdtable_defer {
 };
 
 int sysctl_nr_open __read_mostly = 1024*1024;
+int sysctl_nr_open_min = BITS_PER_LONG;
+int sysctl_nr_open_max = 1024 * 1024; /* raised later */
 
 /*
  * We use this list to defer free fdtables that have vmalloced
@@ -308,11 +310,16 @@ struct files_struct *dup_fd(struct files_struct *oldf, int *errorp)
 
 	/*
 	 * Check whether we need to allocate a larger fd array and fd set.
-	 * Note: we're not a clone task, so the open count won't change.
 	 */
-	if (open_files > new_fdt->max_fds) {
+	while (unlikely(open_files > new_fdt->max_fds)) {
 		spin_unlock(&oldf->file_lock);
 
+		if (new_fdt != &newf->fdtab) {
+			free_fdarr(new_fdt);
+			free_fdset(new_fdt);
+			kfree(new_fdt);
+		}
+
 		new_fdt = alloc_fdtable(open_files - 1);
 		if (!new_fdt) {
 			*errorp = -ENOMEM;
@@ -335,6 +342,7 @@ struct files_struct *dup_fd(struct files_struct *oldf, int *errorp)
 		 */
 		spin_lock(&oldf->file_lock);
 		old_fdt = files_fdtable(oldf);
+		open_files = count_open_files(old_fdt);
 	}
 
 	old_fds = old_fdt->fd;
@@ -399,6 +407,8 @@ void __init files_defer_init(void)
 	int i;
 	for_each_possible_cpu(i)
 		fdtable_defer_list_init(i);
+	sysctl_nr_open_max = min((size_t)INT_MAX, ~(size_t)0/sizeof(void *)) &
+			     -BITS_PER_LONG;
 }
 
 struct files_struct init_files = {