[T106][ZXW-22]7520V3SCV2.01.01.02P42U09_VEC_V0.8_AP_VEC origin source commit
Change-Id: Ic6e05d89ecd62fc34f82b23dcf306c93764aec4b
diff --git a/ap/os/linux/linux-3.4.x/mm/fadvise.c b/ap/os/linux/linux-3.4.x/mm/fadvise.c
new file mode 100644
index 0000000..dcb9872
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/mm/fadvise.c
@@ -0,0 +1,174 @@
+/*
+ * mm/fadvise.c
+ *
+ * Copyright (C) 2002, Linus Torvalds
+ *
+ * 11Jan2003 Andrew Morton
+ * Initial version.
+ */
+
+#include <linux/kernel.h>
+#include <linux/file.h>
+#include <linux/fs.h>
+#include <linux/mm.h>
+#include <linux/pagemap.h>
+#include <linux/backing-dev.h>
+#include <linux/pagevec.h>
+#include <linux/fadvise.h>
+#include <linux/writeback.h>
+#include <linux/syscalls.h>
+#include <linux/swap.h>
+
+#include <asm/unistd.h>
+
+/*
+ * POSIX_FADV_WILLNEED could set PG_Referenced, and POSIX_FADV_NOREUSE could
+ * deactivate the pages and clear PG_Referenced.
+ */
+SYSCALL_DEFINE(fadvise64_64)(int fd, loff_t offset, loff_t len, int advice)
+{
+ struct file *file = fget(fd);
+ struct address_space *mapping;
+ struct backing_dev_info *bdi;
+ loff_t endbyte; /* inclusive */
+ pgoff_t start_index;
+ pgoff_t end_index;
+ unsigned long nrpages;
+ int ret = 0;
+
+ if (!file)
+ return -EBADF;
+
+ if (S_ISFIFO(file->f_path.dentry->d_inode->i_mode)) {
+ ret = -ESPIPE;
+ goto out;
+ }
+
+ mapping = file->f_mapping;
+ if (!mapping || len < 0) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ if (mapping->a_ops->get_xip_mem) {
+ switch (advice) {
+ case POSIX_FADV_NORMAL:
+ case POSIX_FADV_RANDOM:
+ case POSIX_FADV_SEQUENTIAL:
+ case POSIX_FADV_WILLNEED:
+ case POSIX_FADV_NOREUSE:
+ case POSIX_FADV_DONTNEED:
+ /* no bad return value, but ignore advice */
+ break;
+ default:
+ ret = -EINVAL;
+ }
+ goto out;
+ }
+
+ /* Careful about overflows. Len == 0 means "as much as possible" */
+ endbyte = offset + len;
+ if (!len || endbyte < len)
+ endbyte = -1;
+ else
+ endbyte--; /* inclusive */
+
+ bdi = mapping->backing_dev_info;
+
+ switch (advice) {
+ case POSIX_FADV_NORMAL:
+ file->f_ra.ra_pages = bdi->ra_pages;
+ spin_lock(&file->f_lock);
+ file->f_mode &= ~FMODE_RANDOM;
+ spin_unlock(&file->f_lock);
+ break;
+ case POSIX_FADV_RANDOM:
+ spin_lock(&file->f_lock);
+ file->f_mode |= FMODE_RANDOM;
+ spin_unlock(&file->f_lock);
+ break;
+ case POSIX_FADV_SEQUENTIAL:
+ file->f_ra.ra_pages = bdi->ra_pages * 2;
+ spin_lock(&file->f_lock);
+ file->f_mode &= ~FMODE_RANDOM;
+ spin_unlock(&file->f_lock);
+ break;
+ case POSIX_FADV_WILLNEED:
+ if (!mapping->a_ops->readpage) {
+ ret = -EINVAL;
+ break;
+ }
+
+ /* First and last PARTIAL page! */
+ start_index = offset >> PAGE_CACHE_SHIFT;
+ end_index = endbyte >> PAGE_CACHE_SHIFT;
+
+ /* Careful about overflow on the "+1" */
+ nrpages = end_index - start_index + 1;
+ if (!nrpages)
+ nrpages = ~0UL;
+
+ ret = force_page_cache_readahead(mapping, file,
+ start_index,
+ nrpages);
+ if (ret > 0)
+ ret = 0;
+ break;
+ case POSIX_FADV_NOREUSE:
+ break;
+ case POSIX_FADV_DONTNEED:
+ if (!bdi_write_congested(mapping->backing_dev_info))
+ __filemap_fdatawrite_range(mapping, offset, endbyte,
+ WB_SYNC_NONE);
+
+ /* First and last FULL page! */
+ start_index = (offset+(PAGE_CACHE_SIZE-1)) >> PAGE_CACHE_SHIFT;
+ end_index = (endbyte >> PAGE_CACHE_SHIFT);
+
+ if (end_index >= start_index) {
+ unsigned long count = invalidate_mapping_pages(mapping,
+ start_index, end_index);
+
+ /*
+ * If fewer pages were invalidated than expected then
+ * it is possible that some of the pages were on
+ * a per-cpu pagevec for a remote CPU. Drain all
+ * pagevecs and try again.
+ */
+ if (count < (end_index - start_index + 1)) {
+ lru_add_drain_all();
+ invalidate_mapping_pages(mapping, start_index,
+ end_index);
+ }
+ }
+ break;
+ default:
+ ret = -EINVAL;
+ }
+out:
+ fput(file);
+ return ret;
+}
+#ifdef CONFIG_HAVE_SYSCALL_WRAPPERS
+asmlinkage long SyS_fadvise64_64(long fd, loff_t offset, loff_t len, long advice)
+{
+ return SYSC_fadvise64_64((int) fd, offset, len, (int) advice);
+}
+SYSCALL_ALIAS(sys_fadvise64_64, SyS_fadvise64_64);
+#endif
+
+#ifdef __ARCH_WANT_SYS_FADVISE64
+
+SYSCALL_DEFINE(fadvise64)(int fd, loff_t offset, size_t len, int advice)
+{
+ return sys_fadvise64_64(fd, offset, len, advice);
+}
+#ifdef CONFIG_HAVE_SYSCALL_WRAPPERS
+asmlinkage long SyS_fadvise64(long fd, loff_t offset, long len, long advice)
+{
+ return SYSC_fadvise64((int) fd, offset, (size_t)len, (int)advice);
+}
+SYSCALL_ALIAS(sys_fadvise64, SyS_fadvise64);
+#endif
+
+#endif