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authorAmir Goldstein <amir73il@gmail.com>2018-08-28 10:58:41 +0300
committerMiklos Szeredi <mszeredi@redhat.com>2018-09-03 10:43:10 +0300
commitb833a3660394876541d2513ce2736debc7c6797a (patch)
tree3c3605d860fadf27cffeaaf48a292ae1ec69afb6 /fs/overlayfs
parent3d8f7615319b2bca87a4815e13787439e3339a93 (diff)
downloadlinux-b833a3660394876541d2513ce2736debc7c6797a.tar.xz
ovl: add ovl_fadvise()
Implement stacked fadvise to fix syscalls readahead(2) and fadvise64(2) on an overlayfs file. Suggested-by: Miklos Szeredi <mszeredi@redhat.com> Fixes: d1d04ef8572b ("ovl: stack file ops") Signed-off-by: Amir Goldstein <amir73il@gmail.com> Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Diffstat (limited to 'fs/overlayfs')
-rw-r--r--fs/overlayfs/file.c20
1 files changed, 20 insertions, 0 deletions
diff --git a/fs/overlayfs/file.c b/fs/overlayfs/file.c
index a4acd84591d4..aeaefd2a551b 100644
--- a/fs/overlayfs/file.c
+++ b/fs/overlayfs/file.c
@@ -331,6 +331,25 @@ static long ovl_fallocate(struct file *file, int mode, loff_t offset, loff_t len
return ret;
}
+static int ovl_fadvise(struct file *file, loff_t offset, loff_t len, int advice)
+{
+ struct fd real;
+ const struct cred *old_cred;
+ int ret;
+
+ ret = ovl_real_fdget(file, &real);
+ if (ret)
+ return ret;
+
+ old_cred = ovl_override_creds(file_inode(file)->i_sb);
+ ret = vfs_fadvise(real.file, offset, len, advice);
+ revert_creds(old_cred);
+
+ fdput(real);
+
+ return ret;
+}
+
static long ovl_real_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
{
@@ -499,6 +518,7 @@ const struct file_operations ovl_file_operations = {
.fsync = ovl_fsync,
.mmap = ovl_mmap,
.fallocate = ovl_fallocate,
+ .fadvise = ovl_fadvise,
.unlocked_ioctl = ovl_ioctl,
.compat_ioctl = ovl_compat_ioctl,