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| author | Amir Goldstein <amir73il@gmail.com> | 2018-08-28 10:58:41 +0300 |
|---|---|---|
| committer | Miklos Szeredi <mszeredi@redhat.com> | 2018-09-03 09:43:10 +0200 |
| commit | b833a3660394876541d2513ce2736debc7c6797a (patch) | |
| tree | 3c3605d860fadf27cffeaaf48a292ae1ec69afb6 | |
| parent | 3d8f7615319b2bca87a4815e13787439e3339a93 (diff) | |
| download | lwn-b833a3660394876541d2513ce2736debc7c6797a.tar.gz lwn-b833a3660394876541d2513ce2736debc7c6797a.zip | |
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>
| -rw-r--r-- | fs/overlayfs/file.c | 20 |
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, |