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authorSteve French <steve.french@primarydata.com>2015-07-04 18:40:10 -0500
committerSteve French <smfrench@gmail.com>2015-08-20 10:19:25 -0500
commit0de1f4c6f6c028249579d8d80fa0a4f6322b2227 (patch)
treedd543b57f54bcf408d6f8e598b31f3777cb136de /fs/cifs/ioctl.c
parent1b647a166f07dcf08709c8606470f4b17a4aa11d (diff)
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Add way to query server fs info for smb3
The server exports information about the share and underlying device under an SMB3 export, including its attributes and capabilities, which is stored by cifs.ko when first connecting to the share. Add ioctl to cifs.ko to allow user space smb3 helper utilities (in cifs-utils) to display this (e.g. via smb3util). This information is also useful for debugging and for resolving configuration errors. Signed-off-by: Steve French <steve.french@primarydata.com>
Diffstat (limited to 'fs/cifs/ioctl.c')
-rw-r--r--fs/cifs/ioctl.c48
1 files changed, 42 insertions, 6 deletions
diff --git a/fs/cifs/ioctl.c b/fs/cifs/ioctl.c
index 49b8b6e41a18..c63f5227b681 100644
--- 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;