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| author | Steve French <smfrench@gmail.com> | 2016-10-01 04:14:26 +0200 |
|---|---|---|
| committer | Steve French <smfrench@gmail.com> | 2016-10-14 02:48:11 +0200 |
| commit | 834170c85978b0e85805364f623393968f7a9b5e (patch) | |
| tree | 92f80f9bdd84120a4aecacd3a8f8e06ec65079bc /fs/cifs/smb2ops.c | |
| parent | Do not send SMB3 SET_INFO request if nothing is changing (diff) | |
| download | linux-834170c85978b0e85805364f623393968f7a9b5e.tar.xz linux-834170c85978b0e85805364f623393968f7a9b5e.zip | |
Enable previous version support
Add ioctl to query previous versions of file
Allows listing snapshots on files on SMB3 mounts.
Signed-off-by: Steve French <smfrench@gmail.com>
Diffstat (limited to '')
| -rw-r--r-- | fs/cifs/smb2ops.c | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c index 378260cd25a6..f0872d2abc6f 100644 --- a/fs/cifs/smb2ops.c +++ b/fs/cifs/smb2ops.c @@ -28,6 +28,7 @@ #include "cifs_unicode.h" #include "smb2status.h" #include "smb2glob.h" +#include "cifs_ioctl.h" static int change_conf(struct TCP_Server_Info *server) @@ -895,6 +896,50 @@ smb3_set_integrity(const unsigned int xid, struct cifs_tcon *tcon, } static int +smb3_enum_snapshots(const unsigned int xid, struct cifs_tcon *tcon, + struct cifsFileInfo *cfile, void __user *ioc_buf) +{ + char *retbuf = NULL; + unsigned int ret_data_len = 0; + int rc; + struct smb_snapshot_array snapshot_in; + + rc = SMB2_ioctl(xid, tcon, cfile->fid.persistent_fid, + cfile->fid.volatile_fid, + FSCTL_SRV_ENUMERATE_SNAPSHOTS, + true /* is_fsctl */, NULL, 0 /* no input data */, + (char **)&retbuf, + &ret_data_len); + cifs_dbg(FYI, "enum snaphots ioctl returned %d and ret buflen is %d\n", + rc, ret_data_len); + if (rc) + return rc; + + if (ret_data_len && (ioc_buf != NULL) && (retbuf != NULL)) { + /* Fixup buffer */ + if (copy_from_user(&snapshot_in, ioc_buf, + sizeof(struct smb_snapshot_array))) { + rc = -EFAULT; + kfree(retbuf); + return rc; + } + if (snapshot_in.snapshot_array_size < sizeof(struct smb_snapshot_array)) { + rc = -ERANGE; + return rc; + } + + if (ret_data_len > snapshot_in.snapshot_array_size) + ret_data_len = snapshot_in.snapshot_array_size; + + if (copy_to_user(ioc_buf, retbuf, ret_data_len)) + rc = -EFAULT; + } + + kfree(retbuf); + return rc; +} + +static int smb2_query_dir_first(const unsigned int xid, struct cifs_tcon *tcon, const char *path, struct cifs_sb_info *cifs_sb, struct cifs_fid *fid, __u16 search_flags, @@ -1659,6 +1704,7 @@ struct smb_version_operations smb21_operations = { .clone_range = smb2_clone_range, .wp_retry_size = smb2_wp_retry_size, .dir_needs_close = smb2_dir_needs_close, + .enum_snapshots = smb3_enum_snapshots, }; struct smb_version_operations smb30_operations = { @@ -1745,6 +1791,7 @@ struct smb_version_operations smb30_operations = { .wp_retry_size = smb2_wp_retry_size, .dir_needs_close = smb2_dir_needs_close, .fallocate = smb3_fallocate, + .enum_snapshots = smb3_enum_snapshots, }; #ifdef CONFIG_CIFS_SMB311 @@ -1832,6 +1879,7 @@ struct smb_version_operations smb311_operations = { .wp_retry_size = smb2_wp_retry_size, .dir_needs_close = smb2_dir_needs_close, .fallocate = smb3_fallocate, + .enum_snapshots = smb3_enum_snapshots, }; #endif /* CIFS_SMB311 */ |