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-rw-r--r--fs/file_table.c31
1 files changed, 15 insertions, 16 deletions
diff --git a/fs/file_table.c b/fs/file_table.c
index de9e965..aa07d36 100644
--- a/fs/file_table.c
+++ b/fs/file_table.c
@@ -94,8 +94,8 @@ int proc_nr_files(ctl_table *table, int write,
#endif
/* Find an unused file structure and return a pointer to it.
- * Returns NULL, if there are no more free file structures or
- * we run out of memory.
+ * Returns an error pointer if some error happend e.g. we over file
+ * structures limit, run out of memory or operation is not permitted.
*
* Be very careful using this. You are responsible for
* getting write access to any mount that you might assign
@@ -107,7 +107,8 @@ struct file *get_empty_filp(void)
{
const struct cred *cred = current_cred();
static long old_max;
- struct file * f;
+ struct file *f;
+ int error;
/*
* Privileged users can go above max_files
@@ -122,13 +123,16 @@ struct file *get_empty_filp(void)
}
f = kmem_cache_zalloc(filp_cachep, GFP_KERNEL);
- if (f == NULL)
- goto fail;
+ if (unlikely(!f))
+ return ERR_PTR(-ENOMEM);
percpu_counter_inc(&nr_files);
f->f_cred = get_cred(cred);
- if (security_file_alloc(f))
- goto fail_sec;
+ error = security_file_alloc(f);
+ if (unlikely(error)) {
+ file_free(f);
+ return ERR_PTR(error);
+ }
INIT_LIST_HEAD(&f->f_u.fu_list);
atomic_long_set(&f->f_count, 1);
@@ -144,12 +148,7 @@ over:
pr_info("VFS: file-max limit %lu reached\n", get_max_files());
old_max = get_nr_files();
}
- goto fail;
-
-fail_sec:
- file_free(f);
-fail:
- return NULL;
+ return ERR_PTR(-ENFILE);
}
/**
@@ -173,8 +172,8 @@ struct file *alloc_file(struct path *path, fmode_t mode,
struct file *file;
file = get_empty_filp();
- if (!file)
- return NULL;
+ if (IS_ERR(file))
+ return file;
file->f_path = *path;
file->f_mapping = path->dentry->d_inode->i_mapping;
@@ -447,7 +446,7 @@ void mark_files_ro(struct super_block *sb)
lg_global_lock(&files_lglock);
do_file_list_for_each_entry(sb, f) {
- if (!S_ISREG(f->f_path.dentry->d_inode->i_mode))
+ if (!S_ISREG(file_inode(f)->i_mode))
continue;
if (!file_count(f))
continue;
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