Add way to query server fs info for smb3

[firefly-linux-kernel-4.4.55.git] / fs / cifs / ioctl.c

diff --git a/fs/cifs/ioctl.c b/fs/cifs/ioctl.c
index 49b8b6e41a188b3a832c3e32c482ed7a99091aa1..c63f5227b68181ed772d1a999686a852a23d41e9 100644 (file)
--- a/fs/cifs/ioctl.c
+++ b/fs/cifs/ioctl.c
@@ -31,12 +31,9 @@
 #include "cifsproto.h"
 #include "cifs_debug.h"
 #include "cifsfs.h"
+#include "cifs_ioctl.h"
 #include <linux/btrfs.h>
 
-#define CIFS_IOCTL_MAGIC       0xCF
-#define CIFS_IOC_COPYCHUNK_FILE        _IOW(CIFS_IOCTL_MAGIC, 3, int)
-#define CIFS_IOC_SET_INTEGRITY  _IO(CIFS_IOCTL_MAGIC, 4)
-
 static long cifs_ioctl_clone(unsigned int xid, struct file *dst_file,
                        unsigned long srcfd, u64 off, u64 len, u64 destoff,
                        bool dup_extents)
@@ -135,6 +132,43 @@ out_drop_write:
        return rc;
 }
 
+static long smb_mnt_get_fsinfo(unsigned int xid, struct cifs_tcon *tcon,
+                               void __user *arg)
+{
+       int rc = 0;
+       struct smb_mnt_fs_info *fsinf;
+
+       fsinf = kzalloc(sizeof(struct smb_mnt_fs_info), GFP_KERNEL);
+       if (fsinf == NULL)
+               return -ENOMEM;
+
+       fsinf->version = 1;
+       fsinf->protocol_id = tcon->ses->server->vals->protocol_id;
+       fsinf->device_characteristics =
+                       le32_to_cpu(tcon->fsDevInfo.DeviceCharacteristics);
+       fsinf->device_type = le32_to_cpu(tcon->fsDevInfo.DeviceType);
+       fsinf->fs_attributes = le32_to_cpu(tcon->fsAttrInfo.Attributes);
+       fsinf->max_path_component =
+               le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength);
+#ifdef CONFIG_CIFS_SMB2
+       fsinf->vol_serial_number = tcon->vol_serial_number;
+       fsinf->vol_create_time = le64_to_cpu(tcon->vol_create_time);
+       fsinf->share_flags = tcon->share_flags;
+       fsinf->share_caps = le32_to_cpu(tcon->capabilities);
+       fsinf->sector_flags = tcon->ss_flags;
+       fsinf->optimal_sector_size = tcon->perf_sector_size;
+       fsinf->max_bytes_chunk = tcon->max_bytes_chunk;
+       fsinf->maximal_access = tcon->maximal_access;
+#endif /* SMB2 */
+       fsinf->cifs_posix_caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
+
+       if (copy_to_user(arg, fsinf, sizeof(struct smb_mnt_fs_info)))
+               rc = -EFAULT;
+
+       kfree(fsinf);
+       return rc;
+}
+
 long cifs_ioctl(struct file *filep, unsigned int command, unsigned long arg)
 {
        struct inode *inode = file_inode(filep);
@@ -148,8 +182,6 @@ long cifs_ioctl(struct file *filep, unsigned int command, unsigned long arg)
 
        xid = get_xid();
 
-       cifs_dbg(FYI, "ioctl file %p  cmd %u  arg %lu\n", filep, command, arg);
-
        cifs_sb = CIFS_SB(inode->i_sb);
 
        switch (command) {
@@ -228,6 +260,10 @@ long cifs_ioctl(struct file *filep, unsigned int command, unsigned long arg)
                        else
                                rc = -EOPNOTSUPP;
                        break;
+               case CIFS_IOC_GET_MNT_INFO:
+                       tcon = tlink_tcon(pSMBFile->tlink);
+                       rc = smb_mnt_get_fsinfo(xid, tcon, (void __user *)arg);
+                       break;
                default:
                        cifs_dbg(FYI, "unsupported ioctl\n");
                        break;