STATIC struct inode *
linvfs_alloc_inode(
struct super_block *sb)
{
vnode_t *vp;
vp = (vnode_t *)kmem_cache_alloc(linvfs_inode_cachep,
kmem_flags_convert(KM_SLEEP));
if (!vp)
return NULL;
return LINVFS_GET_IP(vp);
}
static char *
__strdup(const char *str, int flags)
{
char *ptr;
int n;
n = strlen(str);
ptr = kmalloc(n + 1, kmem_flags_convert(flags));
if (ptr)
memcpy(ptr, str, n + 1);
return (ptr);
}
char *
kmem_asprintf(const char *fmt, ...)
{
va_list ap;
char *ptr;
do {
va_start(ap, fmt);
ptr = kvasprintf(kmem_flags_convert(KM_SLEEP), fmt, ap);
va_end(ap);
} while (ptr == NULL);
return (ptr);
}
char *
kmem_vasprintf(const char *fmt, va_list ap)
{
va_list aq;
char *ptr;
do {
va_copy(aq, ap);
ptr = kvasprintf(kmem_flags_convert(KM_SLEEP), fmt, aq);
va_end(aq);
} while (ptr == NULL);
return (ptr);
}
struct _buf *
kobj_open_file(const char *name)
{
struct _buf *file;
vnode_t *vp;
int rc;
file = kmalloc(sizeof(_buf_t), kmem_flags_convert(KM_SLEEP));
if (file == NULL)
return ((_buf_t *)-1UL);
if ((rc = vn_open(name, UIO_SYSSPACE, FREAD, 0644, &vp, 0, 0))) {
kfree(file);
return ((_buf_t *)-1UL);
}
file->vp = vp;
return (file);
} /* kobj_open_file() */
/*
* General purpose unified implementation of kmem_alloc(). It is an
* amalgamation of Linux and Illumos allocator design. It should never be
* exported to ensure that code using kmem_alloc()/kmem_zalloc() remains
* relatively portable. Consumers may only access this function through
* wrappers that enforce the common flags to ensure portability.
*/
inline void *
spl_kmem_alloc_impl(size_t size, int flags, int node)
{
gfp_t lflags = kmem_flags_convert(flags);
int use_vmem = 0;
void *ptr;
/*
* Log abnormally large allocations and rate limit the console output.
* Allocations larger than spl_kmem_alloc_warn should be performed
* through the vmem_alloc()/vmem_zalloc() interfaces.
*/
if ((spl_kmem_alloc_warn > 0) && (size > spl_kmem_alloc_warn) &&
!(flags & KM_VMEM)) {
printk(KERN_WARNING
"Large kmem_alloc(%lu, 0x%x), please file an issue at:\n"
"https://github.com/zfsonlinux/zfs/issues/new\n",
(unsigned long)size, flags);
dump_stack();
}
/*
* Use a loop because kmalloc_node() can fail when GFP_KERNEL is used
* unlike kmem_alloc() with KM_SLEEP on Illumos.
*/
do {
/*
* Calling kmalloc_node() when the size >= spl_kmem_alloc_max
* is unsafe. This must fail for all for kmem_alloc() and
* kmem_zalloc() callers.
*
* For vmem_alloc() and vmem_zalloc() callers it is permissible
* to use __vmalloc(). However, in general use of __vmalloc()
* is strongly discouraged because a global lock must be
* acquired. Contention on this lock can significantly
* impact performance so frequently manipulating the virtual
* address space is strongly discouraged.
*/
if ((size > spl_kmem_alloc_max) || use_vmem) {
if (flags & KM_VMEM) {
ptr = __vmalloc(size, lflags, PAGE_KERNEL);
} else {
return (NULL);
}
} else {
ptr = kmalloc_node(size, lflags, node);
}
if (likely(ptr) || (flags & KM_NOSLEEP))
return (ptr);
/*
* For vmem_alloc() and vmem_zalloc() callers retry immediately
* using __vmalloc() which is unlikely to fail.
*/
if ((flags & KM_VMEM) && (use_vmem == 0)) {
use_vmem = 1;
continue;
}
/*
* Use cond_resched() instead of congestion_wait() to avoid
* deadlocking systems where there are no block devices.
*/
cond_resched();
} while (1);
return (NULL);
}
