AcoSail/kernel_optimize_test
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ovl: add ovl_fallocate()

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Implement stacked fallocate.

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Miklos Szeredi 2018-07-18 15:44:42 +02:00
parent 2f502839e8
commit aab8848cee
1 changed files with 24 additions and 0 deletions
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24
fs/overlayfs/file.c
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@ -286,6 +286,29 @@ static int ovl_mmap(struct file *file, struct vm_area_struct *vma)
return ret;
}
static long ovl_fallocate(struct file *file, int mode, loff_t offset, loff_t len)
{
struct inode *inode = file_inode(file);
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_fallocate(real.file, mode, offset, len);
revert_creds(old_cred);
/* Update size */
ovl_copyattr(ovl_inode_real(inode), inode);
fdput(real);
return ret;
}
const struct file_operations ovl_file_operations = {
.open = ovl_open,
.release = ovl_release,
@ -294,4 +317,5 @@ const struct file_operations ovl_file_operations = {
.write_iter = ovl_write_iter,
.fsync = ovl_fsync,
.mmap = ovl_mmap,
.fallocate = ovl_fallocate,
};