cregit-Linux how code gets into the kernel

Release 4.11 fs/cifs/smb2file.c

Directory: fs/cifs
/*
 *   fs/cifs/smb2file.c
 *
 *   Copyright (C) International Business Machines  Corp., 2002, 2011
 *   Author(s): Steve French (sfrench@us.ibm.com),
 *              Pavel Shilovsky ((pshilovsky@samba.org) 2012
 *
 *   This library is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU Lesser General Public License as published
 *   by the Free Software Foundation; either version 2.1 of the License, or
 *   (at your option) any later version.
 *
 *   This library is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
 *   the GNU Lesser General Public License for more details.
 *
 *   You should have received a copy of the GNU Lesser General Public License
 *   along with this library; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
#include <linux/fs.h>
#include <linux/stat.h>
#include <linux/slab.h>
#include <linux/pagemap.h>
#include <asm/div64.h>
#include "cifsfs.h"
#include "cifspdu.h"
#include "cifsglob.h"
#include "cifsproto.h"
#include "cifs_debug.h"
#include "cifs_fs_sb.h"
#include "cifs_unicode.h"
#include "fscache.h"
#include "smb2proto.h"


int smb2_open_file(const unsigned int xid, struct cifs_open_parms *oparms, __u32 *oplock, FILE_ALL_INFO *buf) { int rc; __le16 *smb2_path; struct smb2_file_all_info *smb2_data = NULL; __u8 smb2_oplock[17]; struct cifs_fid *fid = oparms->fid; struct network_resiliency_req nr_ioctl_req; smb2_path = cifs_convert_path_to_utf16(oparms->path, oparms->cifs_sb); if (smb2_path == NULL) { rc = -ENOMEM; goto out; } smb2_data = kzalloc(sizeof(struct smb2_file_all_info) + PATH_MAX * 2, GFP_KERNEL); if (smb2_data == NULL) { rc = -ENOMEM; goto out; } oparms->desired_access |= FILE_READ_ATTRIBUTES; *smb2_oplock = SMB2_OPLOCK_LEVEL_BATCH; if (oparms->tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LEASING) memcpy(smb2_oplock + 1, fid->lease_key, SMB2_LEASE_KEY_SIZE); rc = SMB2_open(xid, oparms, smb2_path, smb2_oplock, smb2_data, NULL); if (rc) goto out; if (oparms->tcon->use_resilient) { nr_ioctl_req.Timeout = 0; /* use server default (120 seconds) */ nr_ioctl_req.Reserved = 0; rc = SMB2_ioctl(xid, oparms->tcon, fid->persistent_fid, fid->volatile_fid, FSCTL_LMR_REQUEST_RESILIENCY, true /* is_fsctl */, false /* use_ipc */, (char *)&nr_ioctl_req, sizeof(nr_ioctl_req), NULL, NULL /* no return info */); if (rc == -EOPNOTSUPP) { cifs_dbg(VFS, "resiliency not supported by server, disabling\n"); oparms->tcon->use_resilient = false; } else if (rc) cifs_dbg(FYI, "error %d setting resiliency\n", rc); rc = 0; } if (buf) { /* open response does not have IndexNumber field - get it */ rc = SMB2_get_srv_num(xid, oparms->tcon, fid->persistent_fid, fid->volatile_fid, &smb2_data->IndexNumber); if (rc) { /* let get_inode_info disable server inode numbers */ smb2_data->IndexNumber = 0; rc = 0; } move_smb2_info_to_cifs(buf, smb2_data); } *oplock = *smb2_oplock; out: kfree(smb2_data); kfree(smb2_path); return rc; }

Contributors

PersonTokensPropCommitsCommitProp
Pavel Shilovsky25269.04%777.78%
Steve French10929.86%111.11%
Aurelien Aptel41.10%111.11%
Total365100.00%9100.00%


int smb2_unlock_range(struct cifsFileInfo *cfile, struct file_lock *flock, const unsigned int xid) { int rc = 0, stored_rc; unsigned int max_num, num = 0, max_buf; struct smb2_lock_element *buf, *cur; struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry)); struct cifsLockInfo *li, *tmp; __u64 length = 1 + flock->fl_end - flock->fl_start; struct list_head tmp_llist; INIT_LIST_HEAD(&tmp_llist); /* * Accessing maxBuf is racy with cifs_reconnect - need to store value * and check it for zero before using. */ max_buf = tcon->ses->server->maxBuf; if (!max_buf) return -EINVAL; max_num = max_buf / sizeof(struct smb2_lock_element); buf = kcalloc(max_num, sizeof(struct smb2_lock_element), GFP_KERNEL); if (!buf) return -ENOMEM; cur = buf; down_write(&cinode->lock_sem); list_for_each_entry_safe(li, tmp, &cfile->llist->locks, llist) { if (flock->fl_start > li->offset || (flock->fl_start + length) < (li->offset + li->length)) continue; if (current->tgid != li->pid) continue; if (cinode->can_cache_brlcks) { /* * We can cache brlock requests - simply remove a lock * from the file's list. */ list_del(&li->llist); cifs_del_lock_waiters(li); kfree(li); continue; } cur->Length = cpu_to_le64(li->length); cur->Offset = cpu_to_le64(li->offset); cur->Flags = cpu_to_le32(SMB2_LOCKFLAG_UNLOCK); /* * We need to save a lock here to let us add it again to the * file's list if the unlock range request fails on the server. */ list_move(&li->llist, &tmp_llist); if (++num == max_num) { stored_rc = smb2_lockv(xid, tcon, cfile->fid.persistent_fid, cfile->fid.volatile_fid, current->tgid, num, buf); if (stored_rc) { /* * We failed on the unlock range request - add * all locks from the tmp list to the head of * the file's list. */ cifs_move_llist(&tmp_llist, &cfile->llist->locks); rc = stored_rc; } else /* * The unlock range request succeed - free the * tmp list. */ cifs_free_llist(&tmp_llist); cur = buf; num = 0; } else cur++; } if (num) { stored_rc = smb2_lockv(xid, tcon, cfile->fid.persistent_fid, cfile->fid.volatile_fid, current->tgid, num, buf); if (stored_rc) { cifs_move_llist(&tmp_llist, &cfile->llist->locks); rc = stored_rc; } else cifs_free_llist(&tmp_llist); } up_write(&cinode->lock_sem); kfree(buf); return rc; }

Contributors

PersonTokensPropCommitsCommitProp
Pavel Shilovsky45098.90%250.00%
David Howells30.66%125.00%
Fabian Frederick20.44%125.00%
Total455100.00%4100.00%


static int smb2_push_mand_fdlocks(struct cifs_fid_locks *fdlocks, const unsigned int xid, struct smb2_lock_element *buf, unsigned int max_num) { int rc = 0, stored_rc; struct cifsFileInfo *cfile = fdlocks->cfile; struct cifsLockInfo *li; unsigned int num = 0; struct smb2_lock_element *cur = buf; struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); list_for_each_entry(li, &fdlocks->locks, llist) { cur->Length = cpu_to_le64(li->length); cur->Offset = cpu_to_le64(li->offset); cur->Flags = cpu_to_le32(li->type | SMB2_LOCKFLAG_FAIL_IMMEDIATELY); if (++num == max_num) { stored_rc = smb2_lockv(xid, tcon, cfile->fid.persistent_fid, cfile->fid.volatile_fid, current->tgid, num, buf); if (stored_rc) rc = stored_rc; cur = buf; num = 0; } else cur++; } if (num) { stored_rc = smb2_lockv(xid, tcon, cfile->fid.persistent_fid, cfile->fid.volatile_fid, current->tgid, num, buf); if (stored_rc) rc = stored_rc; } return rc; }

Contributors

PersonTokensPropCommitsCommitProp
Pavel Shilovsky220100.00%1100.00%
Total220100.00%1100.00%


int smb2_push_mandatory_locks(struct cifsFileInfo *cfile) { int rc = 0, stored_rc; unsigned int xid; unsigned int max_num, max_buf; struct smb2_lock_element *buf; struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry)); struct cifs_fid_locks *fdlocks; xid = get_xid(); /* * Accessing maxBuf is racy with cifs_reconnect - need to store value * and check it for zero before using. */ max_buf = tlink_tcon(cfile->tlink)->ses->server->maxBuf; if (max_buf < sizeof(struct smb2_lock_element)) { free_xid(xid); return -EINVAL; } max_num = max_buf / sizeof(struct smb2_lock_element); buf = kcalloc(max_num, sizeof(struct smb2_lock_element), GFP_KERNEL); if (!buf) { free_xid(xid); return -ENOMEM; } list_for_each_entry(fdlocks, &cinode->llist, llist) { stored_rc = smb2_push_mand_fdlocks(fdlocks, xid, buf, max_num); if (stored_rc) rc = stored_rc; } kfree(buf); free_xid(xid); return rc; }

Contributors

PersonTokensPropCommitsCommitProp
Pavel Shilovsky17497.21%250.00%
David Howells31.68%125.00%
Fabian Frederick21.12%125.00%
Total179100.00%4100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Pavel Shilovsky113990.25%1173.33%
Steve French1098.64%16.67%
David Howells60.48%16.67%
Fabian Frederick40.32%16.67%
Aurelien Aptel40.32%16.67%
Total1262100.00%15100.00%
Directory: fs/cifs
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