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staging: android: ashmem: lseek failed due to no FMODE_LSEEK.
vfs_llseek will check whether the file mode has FMODE_LSEEK, no return failure. But ashmem can be lseek, so add FMODE_LSEEK to ashmem file. Comment From Greg Hackmann: ashmem_llseek() passes the llseek() call through to the backing shmem file.91360b02ab
("ashmem: use vfs_llseek()") changed this from directly calling the file's llseek() op into a VFS layer call. This also adds a check for the FMODE_LSEEK bit, so without that bit ashmem_llseek() now always fails with -ESPIPE. Fixes:91360b02ab
("ashmem: use vfs_llseek()") Signed-off-by: Shuxiao Zhang <zhangshuxiao@xiaomi.com> Tested-by: Greg Hackmann <ghackmann@google.com> Cc: stable <stable@vger.kernel.org> # 3.18+ Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -409,6 +409,7 @@ static int ashmem_mmap(struct file *file, struct vm_area_struct *vma)
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ret = PTR_ERR(vmfile);
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goto out;
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}
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vmfile->f_mode |= FMODE_LSEEK;
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asma->file = vmfile;
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}
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get_file(asma->file);
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