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ovl: check if upperdir fs supports O_TMPFILE

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This is needed for choosing between concurrent copyup
using O_TMPFILE and legacy copyup using workdir+rename.

Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Amir Goldstein
2017-01-17 06:34:53 +02:00
committed by Miklos Szeredi
parent bfe219d373
commit e7f52429b4
3 changed files with 20 additions and 0 deletions
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9
fs/overlayfs/overlayfs.h
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@@ -127,6 +127,15 @@ static inline int ovl_do_whiteout(struct inode *dir, struct dentry *dentry)
return err;
}
static inline struct dentry *ovl_do_tmpfile(struct dentry *dentry, umode_t mode)
{
struct dentry *ret = vfs_tmpfile(dentry, mode, 0);
int err = IS_ERR(ret) ? PTR_ERR(ret) : 0;
pr_debug("tmpfile(%pd2, 0%o) = %i\n", dentry, mode, err);
return ret;
}
static inline struct inode *ovl_inode_real(struct inode *inode, bool *is_upper)
{
unsigned long x = (unsigned long) READ_ONCE(inode->i_private);