2477 строки
63 KiB
C
2477 строки
63 KiB
C
/*
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* fs/cifs/file.c
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*
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* vfs operations that deal with files
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*
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* Copyright (C) International Business Machines Corp., 2002,2010
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* Author(s): Steve French (sfrench@us.ibm.com)
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* Jeremy Allison (jra@samba.org)
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*
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* This library is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published
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* by the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/fs.h>
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#include <linux/backing-dev.h>
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#include <linux/stat.h>
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#include <linux/fcntl.h>
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#include <linux/pagemap.h>
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#include <linux/pagevec.h>
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#include <linux/writeback.h>
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#include <linux/task_io_accounting_ops.h>
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#include <linux/delay.h>
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#include <linux/mount.h>
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#include <linux/slab.h>
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#include <asm/div64.h>
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#include "cifsfs.h"
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#include "cifspdu.h"
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#include "cifsglob.h"
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#include "cifsproto.h"
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#include "cifs_unicode.h"
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#include "cifs_debug.h"
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#include "cifs_fs_sb.h"
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#include "fscache.h"
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static inline int cifs_convert_flags(unsigned int flags)
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{
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if ((flags & O_ACCMODE) == O_RDONLY)
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return GENERIC_READ;
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else if ((flags & O_ACCMODE) == O_WRONLY)
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return GENERIC_WRITE;
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else if ((flags & O_ACCMODE) == O_RDWR) {
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/* GENERIC_ALL is too much permission to request
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can cause unnecessary access denied on create */
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/* return GENERIC_ALL; */
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return (GENERIC_READ | GENERIC_WRITE);
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}
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return (READ_CONTROL | FILE_WRITE_ATTRIBUTES | FILE_READ_ATTRIBUTES |
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FILE_WRITE_EA | FILE_APPEND_DATA | FILE_WRITE_DATA |
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FILE_READ_DATA);
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}
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static u32 cifs_posix_convert_flags(unsigned int flags)
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{
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u32 posix_flags = 0;
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if ((flags & O_ACCMODE) == O_RDONLY)
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posix_flags = SMB_O_RDONLY;
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else if ((flags & O_ACCMODE) == O_WRONLY)
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posix_flags = SMB_O_WRONLY;
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else if ((flags & O_ACCMODE) == O_RDWR)
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posix_flags = SMB_O_RDWR;
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if (flags & O_CREAT)
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posix_flags |= SMB_O_CREAT;
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if (flags & O_EXCL)
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posix_flags |= SMB_O_EXCL;
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if (flags & O_TRUNC)
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posix_flags |= SMB_O_TRUNC;
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/* be safe and imply O_SYNC for O_DSYNC */
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if (flags & O_DSYNC)
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posix_flags |= SMB_O_SYNC;
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if (flags & O_DIRECTORY)
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posix_flags |= SMB_O_DIRECTORY;
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if (flags & O_NOFOLLOW)
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posix_flags |= SMB_O_NOFOLLOW;
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if (flags & O_DIRECT)
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posix_flags |= SMB_O_DIRECT;
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return posix_flags;
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}
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static inline int cifs_get_disposition(unsigned int flags)
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{
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if ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
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return FILE_CREATE;
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else if ((flags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC))
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return FILE_OVERWRITE_IF;
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else if ((flags & O_CREAT) == O_CREAT)
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return FILE_OPEN_IF;
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else if ((flags & O_TRUNC) == O_TRUNC)
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return FILE_OVERWRITE;
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else
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return FILE_OPEN;
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}
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int cifs_posix_open(char *full_path, struct inode **pinode,
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struct super_block *sb, int mode, unsigned int f_flags,
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__u32 *poplock, __u16 *pnetfid, int xid)
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{
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int rc;
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FILE_UNIX_BASIC_INFO *presp_data;
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__u32 posix_flags = 0;
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struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
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struct cifs_fattr fattr;
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struct tcon_link *tlink;
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struct cifs_tcon *tcon;
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cFYI(1, "posix open %s", full_path);
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presp_data = kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
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if (presp_data == NULL)
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return -ENOMEM;
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tlink = cifs_sb_tlink(cifs_sb);
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if (IS_ERR(tlink)) {
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rc = PTR_ERR(tlink);
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goto posix_open_ret;
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}
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tcon = tlink_tcon(tlink);
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mode &= ~current_umask();
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posix_flags = cifs_posix_convert_flags(f_flags);
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rc = CIFSPOSIXCreate(xid, tcon, posix_flags, mode, pnetfid, presp_data,
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poplock, full_path, cifs_sb->local_nls,
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cifs_sb->mnt_cifs_flags &
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CIFS_MOUNT_MAP_SPECIAL_CHR);
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cifs_put_tlink(tlink);
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if (rc)
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goto posix_open_ret;
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if (presp_data->Type == cpu_to_le32(-1))
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goto posix_open_ret; /* open ok, caller does qpathinfo */
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if (!pinode)
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goto posix_open_ret; /* caller does not need info */
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cifs_unix_basic_to_fattr(&fattr, presp_data, cifs_sb);
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/* get new inode and set it up */
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if (*pinode == NULL) {
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cifs_fill_uniqueid(sb, &fattr);
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*pinode = cifs_iget(sb, &fattr);
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if (!*pinode) {
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rc = -ENOMEM;
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goto posix_open_ret;
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}
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} else {
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cifs_fattr_to_inode(*pinode, &fattr);
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}
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posix_open_ret:
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kfree(presp_data);
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return rc;
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}
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static int
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cifs_nt_open(char *full_path, struct inode *inode, struct cifs_sb_info *cifs_sb,
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struct cifs_tcon *tcon, unsigned int f_flags, __u32 *poplock,
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__u16 *pnetfid, int xid)
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{
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int rc;
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int desiredAccess;
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int disposition;
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FILE_ALL_INFO *buf;
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desiredAccess = cifs_convert_flags(f_flags);
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/*********************************************************************
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* open flag mapping table:
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*
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* POSIX Flag CIFS Disposition
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* ---------- ----------------
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* O_CREAT FILE_OPEN_IF
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* O_CREAT | O_EXCL FILE_CREATE
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* O_CREAT | O_TRUNC FILE_OVERWRITE_IF
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* O_TRUNC FILE_OVERWRITE
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* none of the above FILE_OPEN
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*
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* Note that there is not a direct match between disposition
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* FILE_SUPERSEDE (ie create whether or not file exists although
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* O_CREAT | O_TRUNC is similar but truncates the existing
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* file rather than creating a new file as FILE_SUPERSEDE does
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* (which uses the attributes / metadata passed in on open call)
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*?
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*? O_SYNC is a reasonable match to CIFS writethrough flag
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*? and the read write flags match reasonably. O_LARGEFILE
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*? is irrelevant because largefile support is always used
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*? by this client. Flags O_APPEND, O_DIRECT, O_DIRECTORY,
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* O_FASYNC, O_NOFOLLOW, O_NONBLOCK need further investigation
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*********************************************************************/
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disposition = cifs_get_disposition(f_flags);
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/* BB pass O_SYNC flag through on file attributes .. BB */
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buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
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if (!buf)
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return -ENOMEM;
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if (tcon->ses->capabilities & CAP_NT_SMBS)
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rc = CIFSSMBOpen(xid, tcon, full_path, disposition,
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desiredAccess, CREATE_NOT_DIR, pnetfid, poplock, buf,
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cifs_sb->local_nls, cifs_sb->mnt_cifs_flags
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& CIFS_MOUNT_MAP_SPECIAL_CHR);
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else
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rc = SMBLegacyOpen(xid, tcon, full_path, disposition,
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desiredAccess, CREATE_NOT_DIR, pnetfid, poplock, buf,
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cifs_sb->local_nls, cifs_sb->mnt_cifs_flags
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& CIFS_MOUNT_MAP_SPECIAL_CHR);
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if (rc)
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goto out;
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if (tcon->unix_ext)
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rc = cifs_get_inode_info_unix(&inode, full_path, inode->i_sb,
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xid);
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else
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rc = cifs_get_inode_info(&inode, full_path, buf, inode->i_sb,
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xid, pnetfid);
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out:
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kfree(buf);
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return rc;
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}
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struct cifsFileInfo *
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cifs_new_fileinfo(__u16 fileHandle, struct file *file,
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struct tcon_link *tlink, __u32 oplock)
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{
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struct dentry *dentry = file->f_path.dentry;
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struct inode *inode = dentry->d_inode;
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struct cifsInodeInfo *pCifsInode = CIFS_I(inode);
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struct cifsFileInfo *pCifsFile;
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pCifsFile = kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL);
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if (pCifsFile == NULL)
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return pCifsFile;
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pCifsFile->count = 1;
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pCifsFile->netfid = fileHandle;
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pCifsFile->pid = current->tgid;
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pCifsFile->uid = current_fsuid();
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pCifsFile->dentry = dget(dentry);
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pCifsFile->f_flags = file->f_flags;
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pCifsFile->invalidHandle = false;
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pCifsFile->tlink = cifs_get_tlink(tlink);
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mutex_init(&pCifsFile->fh_mutex);
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mutex_init(&pCifsFile->lock_mutex);
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INIT_LIST_HEAD(&pCifsFile->llist);
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INIT_WORK(&pCifsFile->oplock_break, cifs_oplock_break);
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spin_lock(&cifs_file_list_lock);
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list_add(&pCifsFile->tlist, &(tlink_tcon(tlink)->openFileList));
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/* if readable file instance put first in list*/
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if (file->f_mode & FMODE_READ)
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list_add(&pCifsFile->flist, &pCifsInode->openFileList);
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else
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list_add_tail(&pCifsFile->flist, &pCifsInode->openFileList);
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spin_unlock(&cifs_file_list_lock);
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cifs_set_oplock_level(pCifsInode, oplock);
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file->private_data = pCifsFile;
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return pCifsFile;
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}
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/*
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* Release a reference on the file private data. This may involve closing
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* the filehandle out on the server. Must be called without holding
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* cifs_file_list_lock.
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*/
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void cifsFileInfo_put(struct cifsFileInfo *cifs_file)
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{
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struct inode *inode = cifs_file->dentry->d_inode;
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struct cifs_tcon *tcon = tlink_tcon(cifs_file->tlink);
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struct cifsInodeInfo *cifsi = CIFS_I(inode);
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struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
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struct cifsLockInfo *li, *tmp;
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spin_lock(&cifs_file_list_lock);
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if (--cifs_file->count > 0) {
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spin_unlock(&cifs_file_list_lock);
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return;
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}
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/* remove it from the lists */
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list_del(&cifs_file->flist);
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list_del(&cifs_file->tlist);
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if (list_empty(&cifsi->openFileList)) {
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cFYI(1, "closing last open instance for inode %p",
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cifs_file->dentry->d_inode);
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/* in strict cache mode we need invalidate mapping on the last
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close because it may cause a error when we open this file
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again and get at least level II oplock */
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if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO)
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CIFS_I(inode)->invalid_mapping = true;
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cifs_set_oplock_level(cifsi, 0);
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}
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spin_unlock(&cifs_file_list_lock);
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if (!tcon->need_reconnect && !cifs_file->invalidHandle) {
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int xid, rc;
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xid = GetXid();
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rc = CIFSSMBClose(xid, tcon, cifs_file->netfid);
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FreeXid(xid);
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}
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/* Delete any outstanding lock records. We'll lose them when the file
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* is closed anyway.
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*/
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mutex_lock(&cifs_file->lock_mutex);
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list_for_each_entry_safe(li, tmp, &cifs_file->llist, llist) {
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list_del(&li->llist);
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kfree(li);
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}
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mutex_unlock(&cifs_file->lock_mutex);
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cifs_put_tlink(cifs_file->tlink);
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dput(cifs_file->dentry);
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kfree(cifs_file);
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}
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int cifs_open(struct inode *inode, struct file *file)
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{
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int rc = -EACCES;
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int xid;
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__u32 oplock;
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struct cifs_sb_info *cifs_sb;
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struct cifs_tcon *tcon;
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struct tcon_link *tlink;
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struct cifsFileInfo *pCifsFile = NULL;
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char *full_path = NULL;
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bool posix_open_ok = false;
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__u16 netfid;
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xid = GetXid();
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cifs_sb = CIFS_SB(inode->i_sb);
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tlink = cifs_sb_tlink(cifs_sb);
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if (IS_ERR(tlink)) {
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FreeXid(xid);
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return PTR_ERR(tlink);
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}
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tcon = tlink_tcon(tlink);
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full_path = build_path_from_dentry(file->f_path.dentry);
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if (full_path == NULL) {
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rc = -ENOMEM;
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goto out;
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}
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cFYI(1, "inode = 0x%p file flags are 0x%x for %s",
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inode, file->f_flags, full_path);
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if (oplockEnabled)
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oplock = REQ_OPLOCK;
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else
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oplock = 0;
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if (!tcon->broken_posix_open && tcon->unix_ext &&
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(tcon->ses->capabilities & CAP_UNIX) &&
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(CIFS_UNIX_POSIX_PATH_OPS_CAP &
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le64_to_cpu(tcon->fsUnixInfo.Capability))) {
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/* can not refresh inode info since size could be stale */
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rc = cifs_posix_open(full_path, &inode, inode->i_sb,
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cifs_sb->mnt_file_mode /* ignored */,
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file->f_flags, &oplock, &netfid, xid);
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if (rc == 0) {
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cFYI(1, "posix open succeeded");
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posix_open_ok = true;
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} else if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
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if (tcon->ses->serverNOS)
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cERROR(1, "server %s of type %s returned"
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" unexpected error on SMB posix open"
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", disabling posix open support."
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" Check if server update available.",
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tcon->ses->serverName,
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tcon->ses->serverNOS);
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tcon->broken_posix_open = true;
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} else if ((rc != -EIO) && (rc != -EREMOTE) &&
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(rc != -EOPNOTSUPP)) /* path not found or net err */
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goto out;
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/* else fallthrough to retry open the old way on network i/o
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or DFS errors */
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}
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if (!posix_open_ok) {
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rc = cifs_nt_open(full_path, inode, cifs_sb, tcon,
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file->f_flags, &oplock, &netfid, xid);
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if (rc)
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goto out;
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}
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pCifsFile = cifs_new_fileinfo(netfid, file, tlink, oplock);
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if (pCifsFile == NULL) {
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CIFSSMBClose(xid, tcon, netfid);
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rc = -ENOMEM;
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goto out;
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}
|
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cifs_fscache_set_inode_cookie(inode, file);
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if ((oplock & CIFS_CREATE_ACTION) && !posix_open_ok && tcon->unix_ext) {
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/* time to set mode which we can not set earlier due to
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problems creating new read-only files */
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struct cifs_unix_set_info_args args = {
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.mode = inode->i_mode,
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.uid = NO_CHANGE_64,
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.gid = NO_CHANGE_64,
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.ctime = NO_CHANGE_64,
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.atime = NO_CHANGE_64,
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.mtime = NO_CHANGE_64,
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.device = 0,
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};
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CIFSSMBUnixSetFileInfo(xid, tcon, &args, netfid,
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pCifsFile->pid);
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}
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out:
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kfree(full_path);
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FreeXid(xid);
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cifs_put_tlink(tlink);
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return rc;
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}
|
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|
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/* Try to reacquire byte range locks that were released when session */
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/* to server was lost */
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static int cifs_relock_file(struct cifsFileInfo *cifsFile)
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{
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int rc = 0;
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|
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/* BB list all locks open on this file and relock */
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|
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return rc;
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}
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|
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static int cifs_reopen_file(struct cifsFileInfo *pCifsFile, bool can_flush)
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{
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int rc = -EACCES;
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int xid;
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__u32 oplock;
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struct cifs_sb_info *cifs_sb;
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struct cifs_tcon *tcon;
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struct cifsInodeInfo *pCifsInode;
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struct inode *inode;
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char *full_path = NULL;
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int desiredAccess;
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int disposition = FILE_OPEN;
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__u16 netfid;
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xid = GetXid();
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mutex_lock(&pCifsFile->fh_mutex);
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if (!pCifsFile->invalidHandle) {
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mutex_unlock(&pCifsFile->fh_mutex);
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rc = 0;
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FreeXid(xid);
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return rc;
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}
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|
|
inode = pCifsFile->dentry->d_inode;
|
|
cifs_sb = CIFS_SB(inode->i_sb);
|
|
tcon = tlink_tcon(pCifsFile->tlink);
|
|
|
|
/* can not grab rename sem here because various ops, including
|
|
those that already have the rename sem can end up causing writepage
|
|
to get called and if the server was down that means we end up here,
|
|
and we can never tell if the caller already has the rename_sem */
|
|
full_path = build_path_from_dentry(pCifsFile->dentry);
|
|
if (full_path == NULL) {
|
|
rc = -ENOMEM;
|
|
mutex_unlock(&pCifsFile->fh_mutex);
|
|
FreeXid(xid);
|
|
return rc;
|
|
}
|
|
|
|
cFYI(1, "inode = 0x%p file flags 0x%x for %s",
|
|
inode, pCifsFile->f_flags, full_path);
|
|
|
|
if (oplockEnabled)
|
|
oplock = REQ_OPLOCK;
|
|
else
|
|
oplock = 0;
|
|
|
|
if (tcon->unix_ext && (tcon->ses->capabilities & CAP_UNIX) &&
|
|
(CIFS_UNIX_POSIX_PATH_OPS_CAP &
|
|
le64_to_cpu(tcon->fsUnixInfo.Capability))) {
|
|
|
|
/*
|
|
* O_CREAT, O_EXCL and O_TRUNC already had their effect on the
|
|
* original open. Must mask them off for a reopen.
|
|
*/
|
|
unsigned int oflags = pCifsFile->f_flags &
|
|
~(O_CREAT | O_EXCL | O_TRUNC);
|
|
|
|
rc = cifs_posix_open(full_path, NULL, inode->i_sb,
|
|
cifs_sb->mnt_file_mode /* ignored */,
|
|
oflags, &oplock, &netfid, xid);
|
|
if (rc == 0) {
|
|
cFYI(1, "posix reopen succeeded");
|
|
goto reopen_success;
|
|
}
|
|
/* fallthrough to retry open the old way on errors, especially
|
|
in the reconnect path it is important to retry hard */
|
|
}
|
|
|
|
desiredAccess = cifs_convert_flags(pCifsFile->f_flags);
|
|
|
|
/* Can not refresh inode by passing in file_info buf to be returned
|
|
by SMBOpen and then calling get_inode_info with returned buf
|
|
since file might have write behind data that needs to be flushed
|
|
and server version of file size can be stale. If we knew for sure
|
|
that inode was not dirty locally we could do this */
|
|
|
|
rc = CIFSSMBOpen(xid, tcon, full_path, disposition, desiredAccess,
|
|
CREATE_NOT_DIR, &netfid, &oplock, NULL,
|
|
cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
|
|
CIFS_MOUNT_MAP_SPECIAL_CHR);
|
|
if (rc) {
|
|
mutex_unlock(&pCifsFile->fh_mutex);
|
|
cFYI(1, "cifs_open returned 0x%x", rc);
|
|
cFYI(1, "oplock: %d", oplock);
|
|
goto reopen_error_exit;
|
|
}
|
|
|
|
reopen_success:
|
|
pCifsFile->netfid = netfid;
|
|
pCifsFile->invalidHandle = false;
|
|
mutex_unlock(&pCifsFile->fh_mutex);
|
|
pCifsInode = CIFS_I(inode);
|
|
|
|
if (can_flush) {
|
|
rc = filemap_write_and_wait(inode->i_mapping);
|
|
mapping_set_error(inode->i_mapping, rc);
|
|
|
|
if (tcon->unix_ext)
|
|
rc = cifs_get_inode_info_unix(&inode,
|
|
full_path, inode->i_sb, xid);
|
|
else
|
|
rc = cifs_get_inode_info(&inode,
|
|
full_path, NULL, inode->i_sb,
|
|
xid, NULL);
|
|
} /* else we are writing out data to server already
|
|
and could deadlock if we tried to flush data, and
|
|
since we do not know if we have data that would
|
|
invalidate the current end of file on the server
|
|
we can not go to the server to get the new inod
|
|
info */
|
|
|
|
cifs_set_oplock_level(pCifsInode, oplock);
|
|
|
|
cifs_relock_file(pCifsFile);
|
|
|
|
reopen_error_exit:
|
|
kfree(full_path);
|
|
FreeXid(xid);
|
|
return rc;
|
|
}
|
|
|
|
int cifs_close(struct inode *inode, struct file *file)
|
|
{
|
|
if (file->private_data != NULL) {
|
|
cifsFileInfo_put(file->private_data);
|
|
file->private_data = NULL;
|
|
}
|
|
|
|
/* return code from the ->release op is always ignored */
|
|
return 0;
|
|
}
|
|
|
|
int cifs_closedir(struct inode *inode, struct file *file)
|
|
{
|
|
int rc = 0;
|
|
int xid;
|
|
struct cifsFileInfo *pCFileStruct = file->private_data;
|
|
char *ptmp;
|
|
|
|
cFYI(1, "Closedir inode = 0x%p", inode);
|
|
|
|
xid = GetXid();
|
|
|
|
if (pCFileStruct) {
|
|
struct cifs_tcon *pTcon = tlink_tcon(pCFileStruct->tlink);
|
|
|
|
cFYI(1, "Freeing private data in close dir");
|
|
spin_lock(&cifs_file_list_lock);
|
|
if (!pCFileStruct->srch_inf.endOfSearch &&
|
|
!pCFileStruct->invalidHandle) {
|
|
pCFileStruct->invalidHandle = true;
|
|
spin_unlock(&cifs_file_list_lock);
|
|
rc = CIFSFindClose(xid, pTcon, pCFileStruct->netfid);
|
|
cFYI(1, "Closing uncompleted readdir with rc %d",
|
|
rc);
|
|
/* not much we can do if it fails anyway, ignore rc */
|
|
rc = 0;
|
|
} else
|
|
spin_unlock(&cifs_file_list_lock);
|
|
ptmp = pCFileStruct->srch_inf.ntwrk_buf_start;
|
|
if (ptmp) {
|
|
cFYI(1, "closedir free smb buf in srch struct");
|
|
pCFileStruct->srch_inf.ntwrk_buf_start = NULL;
|
|
if (pCFileStruct->srch_inf.smallBuf)
|
|
cifs_small_buf_release(ptmp);
|
|
else
|
|
cifs_buf_release(ptmp);
|
|
}
|
|
cifs_put_tlink(pCFileStruct->tlink);
|
|
kfree(file->private_data);
|
|
file->private_data = NULL;
|
|
}
|
|
/* BB can we lock the filestruct while this is going on? */
|
|
FreeXid(xid);
|
|
return rc;
|
|
}
|
|
|
|
static int store_file_lock(struct cifsFileInfo *fid, __u64 len,
|
|
__u64 offset, __u8 lockType)
|
|
{
|
|
struct cifsLockInfo *li =
|
|
kmalloc(sizeof(struct cifsLockInfo), GFP_KERNEL);
|
|
if (li == NULL)
|
|
return -ENOMEM;
|
|
li->offset = offset;
|
|
li->length = len;
|
|
li->type = lockType;
|
|
mutex_lock(&fid->lock_mutex);
|
|
list_add(&li->llist, &fid->llist);
|
|
mutex_unlock(&fid->lock_mutex);
|
|
return 0;
|
|
}
|
|
|
|
int cifs_lock(struct file *file, int cmd, struct file_lock *pfLock)
|
|
{
|
|
int rc, xid;
|
|
__u32 numLock = 0;
|
|
__u32 numUnlock = 0;
|
|
__u64 length;
|
|
bool wait_flag = false;
|
|
struct cifs_sb_info *cifs_sb;
|
|
struct cifs_tcon *tcon;
|
|
__u16 netfid;
|
|
__u8 lockType = LOCKING_ANDX_LARGE_FILES;
|
|
bool posix_locking = 0;
|
|
|
|
length = 1 + pfLock->fl_end - pfLock->fl_start;
|
|
rc = -EACCES;
|
|
xid = GetXid();
|
|
|
|
cFYI(1, "Lock parm: 0x%x flockflags: "
|
|
"0x%x flocktype: 0x%x start: %lld end: %lld",
|
|
cmd, pfLock->fl_flags, pfLock->fl_type, pfLock->fl_start,
|
|
pfLock->fl_end);
|
|
|
|
if (pfLock->fl_flags & FL_POSIX)
|
|
cFYI(1, "Posix");
|
|
if (pfLock->fl_flags & FL_FLOCK)
|
|
cFYI(1, "Flock");
|
|
if (pfLock->fl_flags & FL_SLEEP) {
|
|
cFYI(1, "Blocking lock");
|
|
wait_flag = true;
|
|
}
|
|
if (pfLock->fl_flags & FL_ACCESS)
|
|
cFYI(1, "Process suspended by mandatory locking - "
|
|
"not implemented yet");
|
|
if (pfLock->fl_flags & FL_LEASE)
|
|
cFYI(1, "Lease on file - not implemented yet");
|
|
if (pfLock->fl_flags &
|
|
(~(FL_POSIX | FL_FLOCK | FL_SLEEP | FL_ACCESS | FL_LEASE)))
|
|
cFYI(1, "Unknown lock flags 0x%x", pfLock->fl_flags);
|
|
|
|
if (pfLock->fl_type == F_WRLCK) {
|
|
cFYI(1, "F_WRLCK ");
|
|
numLock = 1;
|
|
} else if (pfLock->fl_type == F_UNLCK) {
|
|
cFYI(1, "F_UNLCK");
|
|
numUnlock = 1;
|
|
/* Check if unlock includes more than
|
|
one lock range */
|
|
} else if (pfLock->fl_type == F_RDLCK) {
|
|
cFYI(1, "F_RDLCK");
|
|
lockType |= LOCKING_ANDX_SHARED_LOCK;
|
|
numLock = 1;
|
|
} else if (pfLock->fl_type == F_EXLCK) {
|
|
cFYI(1, "F_EXLCK");
|
|
numLock = 1;
|
|
} else if (pfLock->fl_type == F_SHLCK) {
|
|
cFYI(1, "F_SHLCK");
|
|
lockType |= LOCKING_ANDX_SHARED_LOCK;
|
|
numLock = 1;
|
|
} else
|
|
cFYI(1, "Unknown type of lock");
|
|
|
|
cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
|
|
tcon = tlink_tcon(((struct cifsFileInfo *)file->private_data)->tlink);
|
|
netfid = ((struct cifsFileInfo *)file->private_data)->netfid;
|
|
|
|
if ((tcon->ses->capabilities & CAP_UNIX) &&
|
|
(CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) &&
|
|
((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0))
|
|
posix_locking = 1;
|
|
/* BB add code here to normalize offset and length to
|
|
account for negative length which we can not accept over the
|
|
wire */
|
|
if (IS_GETLK(cmd)) {
|
|
if (posix_locking) {
|
|
int posix_lock_type;
|
|
if (lockType & LOCKING_ANDX_SHARED_LOCK)
|
|
posix_lock_type = CIFS_RDLCK;
|
|
else
|
|
posix_lock_type = CIFS_WRLCK;
|
|
rc = CIFSSMBPosixLock(xid, tcon, netfid, 1 /* get */,
|
|
length, pfLock, posix_lock_type,
|
|
wait_flag);
|
|
FreeXid(xid);
|
|
return rc;
|
|
}
|
|
|
|
/* BB we could chain these into one lock request BB */
|
|
rc = CIFSSMBLock(xid, tcon, netfid, length, pfLock->fl_start,
|
|
0, 1, lockType, 0 /* wait flag */, 0);
|
|
if (rc == 0) {
|
|
rc = CIFSSMBLock(xid, tcon, netfid, length,
|
|
pfLock->fl_start, 1 /* numUnlock */ ,
|
|
0 /* numLock */ , lockType,
|
|
0 /* wait flag */, 0);
|
|
pfLock->fl_type = F_UNLCK;
|
|
if (rc != 0)
|
|
cERROR(1, "Error unlocking previously locked "
|
|
"range %d during test of lock", rc);
|
|
rc = 0;
|
|
|
|
} else {
|
|
/* if rc == ERR_SHARING_VIOLATION ? */
|
|
rc = 0;
|
|
|
|
if (lockType & LOCKING_ANDX_SHARED_LOCK) {
|
|
pfLock->fl_type = F_WRLCK;
|
|
} else {
|
|
rc = CIFSSMBLock(xid, tcon, netfid, length,
|
|
pfLock->fl_start, 0, 1,
|
|
lockType | LOCKING_ANDX_SHARED_LOCK,
|
|
0 /* wait flag */, 0);
|
|
if (rc == 0) {
|
|
rc = CIFSSMBLock(xid, tcon, netfid,
|
|
length, pfLock->fl_start, 1, 0,
|
|
lockType |
|
|
LOCKING_ANDX_SHARED_LOCK,
|
|
0 /* wait flag */, 0);
|
|
pfLock->fl_type = F_RDLCK;
|
|
if (rc != 0)
|
|
cERROR(1, "Error unlocking "
|
|
"previously locked range %d "
|
|
"during test of lock", rc);
|
|
rc = 0;
|
|
} else {
|
|
pfLock->fl_type = F_WRLCK;
|
|
rc = 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
FreeXid(xid);
|
|
return rc;
|
|
}
|
|
|
|
if (!numLock && !numUnlock) {
|
|
/* if no lock or unlock then nothing
|
|
to do since we do not know what it is */
|
|
FreeXid(xid);
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
if (posix_locking) {
|
|
int posix_lock_type;
|
|
if (lockType & LOCKING_ANDX_SHARED_LOCK)
|
|
posix_lock_type = CIFS_RDLCK;
|
|
else
|
|
posix_lock_type = CIFS_WRLCK;
|
|
|
|
if (numUnlock == 1)
|
|
posix_lock_type = CIFS_UNLCK;
|
|
|
|
rc = CIFSSMBPosixLock(xid, tcon, netfid, 0 /* set */,
|
|
length, pfLock, posix_lock_type,
|
|
wait_flag);
|
|
} else {
|
|
struct cifsFileInfo *fid = file->private_data;
|
|
|
|
if (numLock) {
|
|
rc = CIFSSMBLock(xid, tcon, netfid, length,
|
|
pfLock->fl_start, 0, numLock, lockType,
|
|
wait_flag, 0);
|
|
|
|
if (rc == 0) {
|
|
/* For Windows locks we must store them. */
|
|
rc = store_file_lock(fid, length,
|
|
pfLock->fl_start, lockType);
|
|
}
|
|
} else if (numUnlock) {
|
|
/* For each stored lock that this unlock overlaps
|
|
completely, unlock it. */
|
|
int stored_rc = 0;
|
|
struct cifsLockInfo *li, *tmp;
|
|
|
|
rc = 0;
|
|
mutex_lock(&fid->lock_mutex);
|
|
list_for_each_entry_safe(li, tmp, &fid->llist, llist) {
|
|
if (pfLock->fl_start <= li->offset &&
|
|
(pfLock->fl_start + length) >=
|
|
(li->offset + li->length)) {
|
|
stored_rc = CIFSSMBLock(xid, tcon,
|
|
netfid, li->length,
|
|
li->offset, 1, 0,
|
|
li->type, false, 0);
|
|
if (stored_rc)
|
|
rc = stored_rc;
|
|
else {
|
|
list_del(&li->llist);
|
|
kfree(li);
|
|
}
|
|
}
|
|
}
|
|
mutex_unlock(&fid->lock_mutex);
|
|
}
|
|
}
|
|
|
|
if (pfLock->fl_flags & FL_POSIX)
|
|
posix_lock_file_wait(file, pfLock);
|
|
FreeXid(xid);
|
|
return rc;
|
|
}
|
|
|
|
/* update the file size (if needed) after a write */
|
|
void
|
|
cifs_update_eof(struct cifsInodeInfo *cifsi, loff_t offset,
|
|
unsigned int bytes_written)
|
|
{
|
|
loff_t end_of_write = offset + bytes_written;
|
|
|
|
if (end_of_write > cifsi->server_eof)
|
|
cifsi->server_eof = end_of_write;
|
|
}
|
|
|
|
static ssize_t cifs_write(struct cifsFileInfo *open_file, __u32 pid,
|
|
const char *write_data, size_t write_size,
|
|
loff_t *poffset)
|
|
{
|
|
int rc = 0;
|
|
unsigned int bytes_written = 0;
|
|
unsigned int total_written;
|
|
struct cifs_sb_info *cifs_sb;
|
|
struct cifs_tcon *pTcon;
|
|
int xid;
|
|
struct dentry *dentry = open_file->dentry;
|
|
struct cifsInodeInfo *cifsi = CIFS_I(dentry->d_inode);
|
|
struct cifs_io_parms io_parms;
|
|
|
|
cifs_sb = CIFS_SB(dentry->d_sb);
|
|
|
|
cFYI(1, "write %zd bytes to offset %lld of %s", write_size,
|
|
*poffset, dentry->d_name.name);
|
|
|
|
pTcon = tlink_tcon(open_file->tlink);
|
|
|
|
xid = GetXid();
|
|
|
|
for (total_written = 0; write_size > total_written;
|
|
total_written += bytes_written) {
|
|
rc = -EAGAIN;
|
|
while (rc == -EAGAIN) {
|
|
struct kvec iov[2];
|
|
unsigned int len;
|
|
|
|
if (open_file->invalidHandle) {
|
|
/* we could deadlock if we called
|
|
filemap_fdatawait from here so tell
|
|
reopen_file not to flush data to
|
|
server now */
|
|
rc = cifs_reopen_file(open_file, false);
|
|
if (rc != 0)
|
|
break;
|
|
}
|
|
|
|
len = min((size_t)cifs_sb->wsize,
|
|
write_size - total_written);
|
|
/* iov[0] is reserved for smb header */
|
|
iov[1].iov_base = (char *)write_data + total_written;
|
|
iov[1].iov_len = len;
|
|
io_parms.netfid = open_file->netfid;
|
|
io_parms.pid = pid;
|
|
io_parms.tcon = pTcon;
|
|
io_parms.offset = *poffset;
|
|
io_parms.length = len;
|
|
rc = CIFSSMBWrite2(xid, &io_parms, &bytes_written, iov,
|
|
1, 0);
|
|
}
|
|
if (rc || (bytes_written == 0)) {
|
|
if (total_written)
|
|
break;
|
|
else {
|
|
FreeXid(xid);
|
|
return rc;
|
|
}
|
|
} else {
|
|
cifs_update_eof(cifsi, *poffset, bytes_written);
|
|
*poffset += bytes_written;
|
|
}
|
|
}
|
|
|
|
cifs_stats_bytes_written(pTcon, total_written);
|
|
|
|
if (total_written > 0) {
|
|
spin_lock(&dentry->d_inode->i_lock);
|
|
if (*poffset > dentry->d_inode->i_size)
|
|
i_size_write(dentry->d_inode, *poffset);
|
|
spin_unlock(&dentry->d_inode->i_lock);
|
|
}
|
|
mark_inode_dirty_sync(dentry->d_inode);
|
|
FreeXid(xid);
|
|
return total_written;
|
|
}
|
|
|
|
struct cifsFileInfo *find_readable_file(struct cifsInodeInfo *cifs_inode,
|
|
bool fsuid_only)
|
|
{
|
|
struct cifsFileInfo *open_file = NULL;
|
|
struct cifs_sb_info *cifs_sb = CIFS_SB(cifs_inode->vfs_inode.i_sb);
|
|
|
|
/* only filter by fsuid on multiuser mounts */
|
|
if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER))
|
|
fsuid_only = false;
|
|
|
|
spin_lock(&cifs_file_list_lock);
|
|
/* we could simply get the first_list_entry since write-only entries
|
|
are always at the end of the list but since the first entry might
|
|
have a close pending, we go through the whole list */
|
|
list_for_each_entry(open_file, &cifs_inode->openFileList, flist) {
|
|
if (fsuid_only && open_file->uid != current_fsuid())
|
|
continue;
|
|
if (OPEN_FMODE(open_file->f_flags) & FMODE_READ) {
|
|
if (!open_file->invalidHandle) {
|
|
/* found a good file */
|
|
/* lock it so it will not be closed on us */
|
|
cifsFileInfo_get(open_file);
|
|
spin_unlock(&cifs_file_list_lock);
|
|
return open_file;
|
|
} /* else might as well continue, and look for
|
|
another, or simply have the caller reopen it
|
|
again rather than trying to fix this handle */
|
|
} else /* write only file */
|
|
break; /* write only files are last so must be done */
|
|
}
|
|
spin_unlock(&cifs_file_list_lock);
|
|
return NULL;
|
|
}
|
|
|
|
struct cifsFileInfo *find_writable_file(struct cifsInodeInfo *cifs_inode,
|
|
bool fsuid_only)
|
|
{
|
|
struct cifsFileInfo *open_file;
|
|
struct cifs_sb_info *cifs_sb;
|
|
bool any_available = false;
|
|
int rc;
|
|
|
|
/* Having a null inode here (because mapping->host was set to zero by
|
|
the VFS or MM) should not happen but we had reports of on oops (due to
|
|
it being zero) during stress testcases so we need to check for it */
|
|
|
|
if (cifs_inode == NULL) {
|
|
cERROR(1, "Null inode passed to cifs_writeable_file");
|
|
dump_stack();
|
|
return NULL;
|
|
}
|
|
|
|
cifs_sb = CIFS_SB(cifs_inode->vfs_inode.i_sb);
|
|
|
|
/* only filter by fsuid on multiuser mounts */
|
|
if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER))
|
|
fsuid_only = false;
|
|
|
|
spin_lock(&cifs_file_list_lock);
|
|
refind_writable:
|
|
list_for_each_entry(open_file, &cifs_inode->openFileList, flist) {
|
|
if (!any_available && open_file->pid != current->tgid)
|
|
continue;
|
|
if (fsuid_only && open_file->uid != current_fsuid())
|
|
continue;
|
|
if (OPEN_FMODE(open_file->f_flags) & FMODE_WRITE) {
|
|
cifsFileInfo_get(open_file);
|
|
|
|
if (!open_file->invalidHandle) {
|
|
/* found a good writable file */
|
|
spin_unlock(&cifs_file_list_lock);
|
|
return open_file;
|
|
}
|
|
|
|
spin_unlock(&cifs_file_list_lock);
|
|
|
|
/* Had to unlock since following call can block */
|
|
rc = cifs_reopen_file(open_file, false);
|
|
if (!rc)
|
|
return open_file;
|
|
|
|
/* if it fails, try another handle if possible */
|
|
cFYI(1, "wp failed on reopen file");
|
|
cifsFileInfo_put(open_file);
|
|
|
|
spin_lock(&cifs_file_list_lock);
|
|
|
|
/* else we simply continue to the next entry. Thus
|
|
we do not loop on reopen errors. If we
|
|
can not reopen the file, for example if we
|
|
reconnected to a server with another client
|
|
racing to delete or lock the file we would not
|
|
make progress if we restarted before the beginning
|
|
of the loop here. */
|
|
}
|
|
}
|
|
/* couldn't find useable FH with same pid, try any available */
|
|
if (!any_available) {
|
|
any_available = true;
|
|
goto refind_writable;
|
|
}
|
|
spin_unlock(&cifs_file_list_lock);
|
|
return NULL;
|
|
}
|
|
|
|
static int cifs_partialpagewrite(struct page *page, unsigned from, unsigned to)
|
|
{
|
|
struct address_space *mapping = page->mapping;
|
|
loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT;
|
|
char *write_data;
|
|
int rc = -EFAULT;
|
|
int bytes_written = 0;
|
|
struct inode *inode;
|
|
struct cifsFileInfo *open_file;
|
|
|
|
if (!mapping || !mapping->host)
|
|
return -EFAULT;
|
|
|
|
inode = page->mapping->host;
|
|
|
|
offset += (loff_t)from;
|
|
write_data = kmap(page);
|
|
write_data += from;
|
|
|
|
if ((to > PAGE_CACHE_SIZE) || (from > to)) {
|
|
kunmap(page);
|
|
return -EIO;
|
|
}
|
|
|
|
/* racing with truncate? */
|
|
if (offset > mapping->host->i_size) {
|
|
kunmap(page);
|
|
return 0; /* don't care */
|
|
}
|
|
|
|
/* check to make sure that we are not extending the file */
|
|
if (mapping->host->i_size - offset < (loff_t)to)
|
|
to = (unsigned)(mapping->host->i_size - offset);
|
|
|
|
open_file = find_writable_file(CIFS_I(mapping->host), false);
|
|
if (open_file) {
|
|
bytes_written = cifs_write(open_file, open_file->pid,
|
|
write_data, to - from, &offset);
|
|
cifsFileInfo_put(open_file);
|
|
/* Does mm or vfs already set times? */
|
|
inode->i_atime = inode->i_mtime = current_fs_time(inode->i_sb);
|
|
if ((bytes_written > 0) && (offset))
|
|
rc = 0;
|
|
else if (bytes_written < 0)
|
|
rc = bytes_written;
|
|
} else {
|
|
cFYI(1, "No writeable filehandles for inode");
|
|
rc = -EIO;
|
|
}
|
|
|
|
kunmap(page);
|
|
return rc;
|
|
}
|
|
|
|
static int cifs_writepages(struct address_space *mapping,
|
|
struct writeback_control *wbc)
|
|
{
|
|
struct cifs_sb_info *cifs_sb = CIFS_SB(mapping->host->i_sb);
|
|
bool done = false, scanned = false, range_whole = false;
|
|
pgoff_t end, index;
|
|
struct cifs_writedata *wdata;
|
|
struct page *page;
|
|
int rc = 0;
|
|
|
|
/*
|
|
* If wsize is smaller than the page cache size, default to writing
|
|
* one page at a time via cifs_writepage
|
|
*/
|
|
if (cifs_sb->wsize < PAGE_CACHE_SIZE)
|
|
return generic_writepages(mapping, wbc);
|
|
|
|
if (wbc->range_cyclic) {
|
|
index = mapping->writeback_index; /* Start from prev offset */
|
|
end = -1;
|
|
} else {
|
|
index = wbc->range_start >> PAGE_CACHE_SHIFT;
|
|
end = wbc->range_end >> PAGE_CACHE_SHIFT;
|
|
if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX)
|
|
range_whole = true;
|
|
scanned = true;
|
|
}
|
|
retry:
|
|
while (!done && index <= end) {
|
|
unsigned int i, nr_pages, found_pages;
|
|
pgoff_t next = 0, tofind;
|
|
struct page **pages;
|
|
|
|
tofind = min((cifs_sb->wsize / PAGE_CACHE_SIZE) - 1,
|
|
end - index) + 1;
|
|
|
|
wdata = cifs_writedata_alloc((unsigned int)tofind);
|
|
if (!wdata) {
|
|
rc = -ENOMEM;
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* find_get_pages_tag seems to return a max of 256 on each
|
|
* iteration, so we must call it several times in order to
|
|
* fill the array or the wsize is effectively limited to
|
|
* 256 * PAGE_CACHE_SIZE.
|
|
*/
|
|
found_pages = 0;
|
|
pages = wdata->pages;
|
|
do {
|
|
nr_pages = find_get_pages_tag(mapping, &index,
|
|
PAGECACHE_TAG_DIRTY,
|
|
tofind, pages);
|
|
found_pages += nr_pages;
|
|
tofind -= nr_pages;
|
|
pages += nr_pages;
|
|
} while (nr_pages && tofind && index <= end);
|
|
|
|
if (found_pages == 0) {
|
|
kref_put(&wdata->refcount, cifs_writedata_release);
|
|
break;
|
|
}
|
|
|
|
nr_pages = 0;
|
|
for (i = 0; i < found_pages; i++) {
|
|
page = wdata->pages[i];
|
|
/*
|
|
* At this point we hold neither mapping->tree_lock nor
|
|
* lock on the page itself: the page may be truncated or
|
|
* invalidated (changing page->mapping to NULL), or even
|
|
* swizzled back from swapper_space to tmpfs file
|
|
* mapping
|
|
*/
|
|
|
|
if (nr_pages == 0)
|
|
lock_page(page);
|
|
else if (!trylock_page(page))
|
|
break;
|
|
|
|
if (unlikely(page->mapping != mapping)) {
|
|
unlock_page(page);
|
|
break;
|
|
}
|
|
|
|
if (!wbc->range_cyclic && page->index > end) {
|
|
done = true;
|
|
unlock_page(page);
|
|
break;
|
|
}
|
|
|
|
if (next && (page->index != next)) {
|
|
/* Not next consecutive page */
|
|
unlock_page(page);
|
|
break;
|
|
}
|
|
|
|
if (wbc->sync_mode != WB_SYNC_NONE)
|
|
wait_on_page_writeback(page);
|
|
|
|
if (PageWriteback(page) ||
|
|
!clear_page_dirty_for_io(page)) {
|
|
unlock_page(page);
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* This actually clears the dirty bit in the radix tree.
|
|
* See cifs_writepage() for more commentary.
|
|
*/
|
|
set_page_writeback(page);
|
|
|
|
if (page_offset(page) >= mapping->host->i_size) {
|
|
done = true;
|
|
unlock_page(page);
|
|
end_page_writeback(page);
|
|
break;
|
|
}
|
|
|
|
wdata->pages[i] = page;
|
|
next = page->index + 1;
|
|
++nr_pages;
|
|
}
|
|
|
|
/* reset index to refind any pages skipped */
|
|
if (nr_pages == 0)
|
|
index = wdata->pages[0]->index + 1;
|
|
|
|
/* put any pages we aren't going to use */
|
|
for (i = nr_pages; i < found_pages; i++) {
|
|
page_cache_release(wdata->pages[i]);
|
|
wdata->pages[i] = NULL;
|
|
}
|
|
|
|
/* nothing to write? */
|
|
if (nr_pages == 0) {
|
|
kref_put(&wdata->refcount, cifs_writedata_release);
|
|
continue;
|
|
}
|
|
|
|
wdata->sync_mode = wbc->sync_mode;
|
|
wdata->nr_pages = nr_pages;
|
|
wdata->offset = page_offset(wdata->pages[0]);
|
|
|
|
do {
|
|
if (wdata->cfile != NULL)
|
|
cifsFileInfo_put(wdata->cfile);
|
|
wdata->cfile = find_writable_file(CIFS_I(mapping->host),
|
|
false);
|
|
if (!wdata->cfile) {
|
|
cERROR(1, "No writable handles for inode");
|
|
rc = -EBADF;
|
|
break;
|
|
}
|
|
rc = cifs_async_writev(wdata);
|
|
} while (wbc->sync_mode == WB_SYNC_ALL && rc == -EAGAIN);
|
|
|
|
for (i = 0; i < nr_pages; ++i)
|
|
unlock_page(wdata->pages[i]);
|
|
|
|
/* send failure -- clean up the mess */
|
|
if (rc != 0) {
|
|
for (i = 0; i < nr_pages; ++i) {
|
|
if (rc == -EAGAIN)
|
|
redirty_page_for_writepage(wbc,
|
|
wdata->pages[i]);
|
|
else
|
|
SetPageError(wdata->pages[i]);
|
|
end_page_writeback(wdata->pages[i]);
|
|
page_cache_release(wdata->pages[i]);
|
|
}
|
|
if (rc != -EAGAIN)
|
|
mapping_set_error(mapping, rc);
|
|
}
|
|
kref_put(&wdata->refcount, cifs_writedata_release);
|
|
|
|
wbc->nr_to_write -= nr_pages;
|
|
if (wbc->nr_to_write <= 0)
|
|
done = true;
|
|
|
|
index = next;
|
|
}
|
|
|
|
if (!scanned && !done) {
|
|
/*
|
|
* We hit the last page and there is more work to be done: wrap
|
|
* back to the start of the file
|
|
*/
|
|
scanned = true;
|
|
index = 0;
|
|
goto retry;
|
|
}
|
|
|
|
if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0))
|
|
mapping->writeback_index = index;
|
|
|
|
return rc;
|
|
}
|
|
|
|
static int
|
|
cifs_writepage_locked(struct page *page, struct writeback_control *wbc)
|
|
{
|
|
int rc;
|
|
int xid;
|
|
|
|
xid = GetXid();
|
|
/* BB add check for wbc flags */
|
|
page_cache_get(page);
|
|
if (!PageUptodate(page))
|
|
cFYI(1, "ppw - page not up to date");
|
|
|
|
/*
|
|
* Set the "writeback" flag, and clear "dirty" in the radix tree.
|
|
*
|
|
* A writepage() implementation always needs to do either this,
|
|
* or re-dirty the page with "redirty_page_for_writepage()" in
|
|
* the case of a failure.
|
|
*
|
|
* Just unlocking the page will cause the radix tree tag-bits
|
|
* to fail to update with the state of the page correctly.
|
|
*/
|
|
set_page_writeback(page);
|
|
retry_write:
|
|
rc = cifs_partialpagewrite(page, 0, PAGE_CACHE_SIZE);
|
|
if (rc == -EAGAIN && wbc->sync_mode == WB_SYNC_ALL)
|
|
goto retry_write;
|
|
else if (rc == -EAGAIN)
|
|
redirty_page_for_writepage(wbc, page);
|
|
else if (rc != 0)
|
|
SetPageError(page);
|
|
else
|
|
SetPageUptodate(page);
|
|
end_page_writeback(page);
|
|
page_cache_release(page);
|
|
FreeXid(xid);
|
|
return rc;
|
|
}
|
|
|
|
static int cifs_writepage(struct page *page, struct writeback_control *wbc)
|
|
{
|
|
int rc = cifs_writepage_locked(page, wbc);
|
|
unlock_page(page);
|
|
return rc;
|
|
}
|
|
|
|
static int cifs_write_end(struct file *file, struct address_space *mapping,
|
|
loff_t pos, unsigned len, unsigned copied,
|
|
struct page *page, void *fsdata)
|
|
{
|
|
int rc;
|
|
struct inode *inode = mapping->host;
|
|
struct cifsFileInfo *cfile = file->private_data;
|
|
struct cifs_sb_info *cifs_sb = CIFS_SB(cfile->dentry->d_sb);
|
|
__u32 pid;
|
|
|
|
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
|
|
pid = cfile->pid;
|
|
else
|
|
pid = current->tgid;
|
|
|
|
cFYI(1, "write_end for page %p from pos %lld with %d bytes",
|
|
page, pos, copied);
|
|
|
|
if (PageChecked(page)) {
|
|
if (copied == len)
|
|
SetPageUptodate(page);
|
|
ClearPageChecked(page);
|
|
} else if (!PageUptodate(page) && copied == PAGE_CACHE_SIZE)
|
|
SetPageUptodate(page);
|
|
|
|
if (!PageUptodate(page)) {
|
|
char *page_data;
|
|
unsigned offset = pos & (PAGE_CACHE_SIZE - 1);
|
|
int xid;
|
|
|
|
xid = GetXid();
|
|
/* this is probably better than directly calling
|
|
partialpage_write since in this function the file handle is
|
|
known which we might as well leverage */
|
|
/* BB check if anything else missing out of ppw
|
|
such as updating last write time */
|
|
page_data = kmap(page);
|
|
rc = cifs_write(cfile, pid, page_data + offset, copied, &pos);
|
|
/* if (rc < 0) should we set writebehind rc? */
|
|
kunmap(page);
|
|
|
|
FreeXid(xid);
|
|
} else {
|
|
rc = copied;
|
|
pos += copied;
|
|
set_page_dirty(page);
|
|
}
|
|
|
|
if (rc > 0) {
|
|
spin_lock(&inode->i_lock);
|
|
if (pos > inode->i_size)
|
|
i_size_write(inode, pos);
|
|
spin_unlock(&inode->i_lock);
|
|
}
|
|
|
|
unlock_page(page);
|
|
page_cache_release(page);
|
|
|
|
return rc;
|
|
}
|
|
|
|
int cifs_strict_fsync(struct file *file, loff_t start, loff_t end,
|
|
int datasync)
|
|
{
|
|
int xid;
|
|
int rc = 0;
|
|
struct cifs_tcon *tcon;
|
|
struct cifsFileInfo *smbfile = file->private_data;
|
|
struct inode *inode = file->f_path.dentry->d_inode;
|
|
struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
|
|
|
|
rc = filemap_write_and_wait_range(inode->i_mapping, start, end);
|
|
if (rc)
|
|
return rc;
|
|
mutex_lock(&inode->i_mutex);
|
|
|
|
xid = GetXid();
|
|
|
|
cFYI(1, "Sync file - name: %s datasync: 0x%x",
|
|
file->f_path.dentry->d_name.name, datasync);
|
|
|
|
if (!CIFS_I(inode)->clientCanCacheRead) {
|
|
rc = cifs_invalidate_mapping(inode);
|
|
if (rc) {
|
|
cFYI(1, "rc: %d during invalidate phase", rc);
|
|
rc = 0; /* don't care about it in fsync */
|
|
}
|
|
}
|
|
|
|
tcon = tlink_tcon(smbfile->tlink);
|
|
if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC))
|
|
rc = CIFSSMBFlush(xid, tcon, smbfile->netfid);
|
|
|
|
FreeXid(xid);
|
|
mutex_unlock(&inode->i_mutex);
|
|
return rc;
|
|
}
|
|
|
|
int cifs_fsync(struct file *file, loff_t start, loff_t end, int datasync)
|
|
{
|
|
int xid;
|
|
int rc = 0;
|
|
struct cifs_tcon *tcon;
|
|
struct cifsFileInfo *smbfile = file->private_data;
|
|
struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
|
|
struct inode *inode = file->f_mapping->host;
|
|
|
|
rc = filemap_write_and_wait_range(inode->i_mapping, start, end);
|
|
if (rc)
|
|
return rc;
|
|
mutex_lock(&inode->i_mutex);
|
|
|
|
xid = GetXid();
|
|
|
|
cFYI(1, "Sync file - name: %s datasync: 0x%x",
|
|
file->f_path.dentry->d_name.name, datasync);
|
|
|
|
tcon = tlink_tcon(smbfile->tlink);
|
|
if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC))
|
|
rc = CIFSSMBFlush(xid, tcon, smbfile->netfid);
|
|
|
|
FreeXid(xid);
|
|
mutex_unlock(&inode->i_mutex);
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* As file closes, flush all cached write data for this inode checking
|
|
* for write behind errors.
|
|
*/
|
|
int cifs_flush(struct file *file, fl_owner_t id)
|
|
{
|
|
struct inode *inode = file->f_path.dentry->d_inode;
|
|
int rc = 0;
|
|
|
|
if (file->f_mode & FMODE_WRITE)
|
|
rc = filemap_write_and_wait(inode->i_mapping);
|
|
|
|
cFYI(1, "Flush inode %p file %p rc %d", inode, file, rc);
|
|
|
|
return rc;
|
|
}
|
|
|
|
static int
|
|
cifs_write_allocate_pages(struct page **pages, unsigned long num_pages)
|
|
{
|
|
int rc = 0;
|
|
unsigned long i;
|
|
|
|
for (i = 0; i < num_pages; i++) {
|
|
pages[i] = alloc_page(__GFP_HIGHMEM);
|
|
if (!pages[i]) {
|
|
/*
|
|
* save number of pages we have already allocated and
|
|
* return with ENOMEM error
|
|
*/
|
|
num_pages = i;
|
|
rc = -ENOMEM;
|
|
goto error;
|
|
}
|
|
}
|
|
|
|
return rc;
|
|
|
|
error:
|
|
for (i = 0; i < num_pages; i++)
|
|
put_page(pages[i]);
|
|
return rc;
|
|
}
|
|
|
|
static inline
|
|
size_t get_numpages(const size_t wsize, const size_t len, size_t *cur_len)
|
|
{
|
|
size_t num_pages;
|
|
size_t clen;
|
|
|
|
clen = min_t(const size_t, len, wsize);
|
|
num_pages = clen / PAGE_CACHE_SIZE;
|
|
if (clen % PAGE_CACHE_SIZE)
|
|
num_pages++;
|
|
|
|
if (cur_len)
|
|
*cur_len = clen;
|
|
|
|
return num_pages;
|
|
}
|
|
|
|
static ssize_t
|
|
cifs_iovec_write(struct file *file, const struct iovec *iov,
|
|
unsigned long nr_segs, loff_t *poffset)
|
|
{
|
|
unsigned int written;
|
|
unsigned long num_pages, npages, i;
|
|
size_t copied, len, cur_len;
|
|
ssize_t total_written = 0;
|
|
struct kvec *to_send;
|
|
struct page **pages;
|
|
struct iov_iter it;
|
|
struct inode *inode;
|
|
struct cifsFileInfo *open_file;
|
|
struct cifs_tcon *pTcon;
|
|
struct cifs_sb_info *cifs_sb;
|
|
struct cifs_io_parms io_parms;
|
|
int xid, rc;
|
|
__u32 pid;
|
|
|
|
len = iov_length(iov, nr_segs);
|
|
if (!len)
|
|
return 0;
|
|
|
|
rc = generic_write_checks(file, poffset, &len, 0);
|
|
if (rc)
|
|
return rc;
|
|
|
|
cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
|
|
num_pages = get_numpages(cifs_sb->wsize, len, &cur_len);
|
|
|
|
pages = kmalloc(sizeof(struct pages *)*num_pages, GFP_KERNEL);
|
|
if (!pages)
|
|
return -ENOMEM;
|
|
|
|
to_send = kmalloc(sizeof(struct kvec)*(num_pages + 1), GFP_KERNEL);
|
|
if (!to_send) {
|
|
kfree(pages);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
rc = cifs_write_allocate_pages(pages, num_pages);
|
|
if (rc) {
|
|
kfree(pages);
|
|
kfree(to_send);
|
|
return rc;
|
|
}
|
|
|
|
xid = GetXid();
|
|
open_file = file->private_data;
|
|
|
|
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
|
|
pid = open_file->pid;
|
|
else
|
|
pid = current->tgid;
|
|
|
|
pTcon = tlink_tcon(open_file->tlink);
|
|
inode = file->f_path.dentry->d_inode;
|
|
|
|
iov_iter_init(&it, iov, nr_segs, len, 0);
|
|
npages = num_pages;
|
|
|
|
do {
|
|
size_t save_len = cur_len;
|
|
for (i = 0; i < npages; i++) {
|
|
copied = min_t(const size_t, cur_len, PAGE_CACHE_SIZE);
|
|
copied = iov_iter_copy_from_user(pages[i], &it, 0,
|
|
copied);
|
|
cur_len -= copied;
|
|
iov_iter_advance(&it, copied);
|
|
to_send[i+1].iov_base = kmap(pages[i]);
|
|
to_send[i+1].iov_len = copied;
|
|
}
|
|
|
|
cur_len = save_len - cur_len;
|
|
|
|
do {
|
|
if (open_file->invalidHandle) {
|
|
rc = cifs_reopen_file(open_file, false);
|
|
if (rc != 0)
|
|
break;
|
|
}
|
|
io_parms.netfid = open_file->netfid;
|
|
io_parms.pid = pid;
|
|
io_parms.tcon = pTcon;
|
|
io_parms.offset = *poffset;
|
|
io_parms.length = cur_len;
|
|
rc = CIFSSMBWrite2(xid, &io_parms, &written, to_send,
|
|
npages, 0);
|
|
} while (rc == -EAGAIN);
|
|
|
|
for (i = 0; i < npages; i++)
|
|
kunmap(pages[i]);
|
|
|
|
if (written) {
|
|
len -= written;
|
|
total_written += written;
|
|
cifs_update_eof(CIFS_I(inode), *poffset, written);
|
|
*poffset += written;
|
|
} else if (rc < 0) {
|
|
if (!total_written)
|
|
total_written = rc;
|
|
break;
|
|
}
|
|
|
|
/* get length and number of kvecs of the next write */
|
|
npages = get_numpages(cifs_sb->wsize, len, &cur_len);
|
|
} while (len > 0);
|
|
|
|
if (total_written > 0) {
|
|
spin_lock(&inode->i_lock);
|
|
if (*poffset > inode->i_size)
|
|
i_size_write(inode, *poffset);
|
|
spin_unlock(&inode->i_lock);
|
|
}
|
|
|
|
cifs_stats_bytes_written(pTcon, total_written);
|
|
mark_inode_dirty_sync(inode);
|
|
|
|
for (i = 0; i < num_pages; i++)
|
|
put_page(pages[i]);
|
|
kfree(to_send);
|
|
kfree(pages);
|
|
FreeXid(xid);
|
|
return total_written;
|
|
}
|
|
|
|
ssize_t cifs_user_writev(struct kiocb *iocb, const struct iovec *iov,
|
|
unsigned long nr_segs, loff_t pos)
|
|
{
|
|
ssize_t written;
|
|
struct inode *inode;
|
|
|
|
inode = iocb->ki_filp->f_path.dentry->d_inode;
|
|
|
|
/*
|
|
* BB - optimize the way when signing is disabled. We can drop this
|
|
* extra memory-to-memory copying and use iovec buffers for constructing
|
|
* write request.
|
|
*/
|
|
|
|
written = cifs_iovec_write(iocb->ki_filp, iov, nr_segs, &pos);
|
|
if (written > 0) {
|
|
CIFS_I(inode)->invalid_mapping = true;
|
|
iocb->ki_pos = pos;
|
|
}
|
|
|
|
return written;
|
|
}
|
|
|
|
ssize_t cifs_strict_writev(struct kiocb *iocb, const struct iovec *iov,
|
|
unsigned long nr_segs, loff_t pos)
|
|
{
|
|
struct inode *inode;
|
|
|
|
inode = iocb->ki_filp->f_path.dentry->d_inode;
|
|
|
|
if (CIFS_I(inode)->clientCanCacheAll)
|
|
return generic_file_aio_write(iocb, iov, nr_segs, pos);
|
|
|
|
/*
|
|
* In strict cache mode we need to write the data to the server exactly
|
|
* from the pos to pos+len-1 rather than flush all affected pages
|
|
* because it may cause a error with mandatory locks on these pages but
|
|
* not on the region from pos to ppos+len-1.
|
|
*/
|
|
|
|
return cifs_user_writev(iocb, iov, nr_segs, pos);
|
|
}
|
|
|
|
static ssize_t
|
|
cifs_iovec_read(struct file *file, const struct iovec *iov,
|
|
unsigned long nr_segs, loff_t *poffset)
|
|
{
|
|
int rc;
|
|
int xid;
|
|
ssize_t total_read;
|
|
unsigned int bytes_read = 0;
|
|
size_t len, cur_len;
|
|
int iov_offset = 0;
|
|
struct cifs_sb_info *cifs_sb;
|
|
struct cifs_tcon *pTcon;
|
|
struct cifsFileInfo *open_file;
|
|
struct smb_com_read_rsp *pSMBr;
|
|
struct cifs_io_parms io_parms;
|
|
char *read_data;
|
|
__u32 pid;
|
|
|
|
if (!nr_segs)
|
|
return 0;
|
|
|
|
len = iov_length(iov, nr_segs);
|
|
if (!len)
|
|
return 0;
|
|
|
|
xid = GetXid();
|
|
cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
|
|
|
|
open_file = file->private_data;
|
|
pTcon = tlink_tcon(open_file->tlink);
|
|
|
|
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
|
|
pid = open_file->pid;
|
|
else
|
|
pid = current->tgid;
|
|
|
|
if ((file->f_flags & O_ACCMODE) == O_WRONLY)
|
|
cFYI(1, "attempting read on write only file instance");
|
|
|
|
for (total_read = 0; total_read < len; total_read += bytes_read) {
|
|
cur_len = min_t(const size_t, len - total_read, cifs_sb->rsize);
|
|
rc = -EAGAIN;
|
|
read_data = NULL;
|
|
|
|
while (rc == -EAGAIN) {
|
|
int buf_type = CIFS_NO_BUFFER;
|
|
if (open_file->invalidHandle) {
|
|
rc = cifs_reopen_file(open_file, true);
|
|
if (rc != 0)
|
|
break;
|
|
}
|
|
io_parms.netfid = open_file->netfid;
|
|
io_parms.pid = pid;
|
|
io_parms.tcon = pTcon;
|
|
io_parms.offset = *poffset;
|
|
io_parms.length = cur_len;
|
|
rc = CIFSSMBRead(xid, &io_parms, &bytes_read,
|
|
&read_data, &buf_type);
|
|
pSMBr = (struct smb_com_read_rsp *)read_data;
|
|
if (read_data) {
|
|
char *data_offset = read_data + 4 +
|
|
le16_to_cpu(pSMBr->DataOffset);
|
|
if (memcpy_toiovecend(iov, data_offset,
|
|
iov_offset, bytes_read))
|
|
rc = -EFAULT;
|
|
if (buf_type == CIFS_SMALL_BUFFER)
|
|
cifs_small_buf_release(read_data);
|
|
else if (buf_type == CIFS_LARGE_BUFFER)
|
|
cifs_buf_release(read_data);
|
|
read_data = NULL;
|
|
iov_offset += bytes_read;
|
|
}
|
|
}
|
|
|
|
if (rc || (bytes_read == 0)) {
|
|
if (total_read) {
|
|
break;
|
|
} else {
|
|
FreeXid(xid);
|
|
return rc;
|
|
}
|
|
} else {
|
|
cifs_stats_bytes_read(pTcon, bytes_read);
|
|
*poffset += bytes_read;
|
|
}
|
|
}
|
|
|
|
FreeXid(xid);
|
|
return total_read;
|
|
}
|
|
|
|
ssize_t cifs_user_readv(struct kiocb *iocb, const struct iovec *iov,
|
|
unsigned long nr_segs, loff_t pos)
|
|
{
|
|
ssize_t read;
|
|
|
|
read = cifs_iovec_read(iocb->ki_filp, iov, nr_segs, &pos);
|
|
if (read > 0)
|
|
iocb->ki_pos = pos;
|
|
|
|
return read;
|
|
}
|
|
|
|
ssize_t cifs_strict_readv(struct kiocb *iocb, const struct iovec *iov,
|
|
unsigned long nr_segs, loff_t pos)
|
|
{
|
|
struct inode *inode;
|
|
|
|
inode = iocb->ki_filp->f_path.dentry->d_inode;
|
|
|
|
if (CIFS_I(inode)->clientCanCacheRead)
|
|
return generic_file_aio_read(iocb, iov, nr_segs, pos);
|
|
|
|
/*
|
|
* In strict cache mode we need to read from the server all the time
|
|
* if we don't have level II oplock because the server can delay mtime
|
|
* change - so we can't make a decision about inode invalidating.
|
|
* And we can also fail with pagereading if there are mandatory locks
|
|
* on pages affected by this read but not on the region from pos to
|
|
* pos+len-1.
|
|
*/
|
|
|
|
return cifs_user_readv(iocb, iov, nr_segs, pos);
|
|
}
|
|
|
|
static ssize_t cifs_read(struct file *file, char *read_data, size_t read_size,
|
|
loff_t *poffset)
|
|
{
|
|
int rc = -EACCES;
|
|
unsigned int bytes_read = 0;
|
|
unsigned int total_read;
|
|
unsigned int current_read_size;
|
|
struct cifs_sb_info *cifs_sb;
|
|
struct cifs_tcon *pTcon;
|
|
int xid;
|
|
char *current_offset;
|
|
struct cifsFileInfo *open_file;
|
|
struct cifs_io_parms io_parms;
|
|
int buf_type = CIFS_NO_BUFFER;
|
|
__u32 pid;
|
|
|
|
xid = GetXid();
|
|
cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
|
|
|
|
if (file->private_data == NULL) {
|
|
rc = -EBADF;
|
|
FreeXid(xid);
|
|
return rc;
|
|
}
|
|
open_file = file->private_data;
|
|
pTcon = tlink_tcon(open_file->tlink);
|
|
|
|
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
|
|
pid = open_file->pid;
|
|
else
|
|
pid = current->tgid;
|
|
|
|
if ((file->f_flags & O_ACCMODE) == O_WRONLY)
|
|
cFYI(1, "attempting read on write only file instance");
|
|
|
|
for (total_read = 0, current_offset = read_data;
|
|
read_size > total_read;
|
|
total_read += bytes_read, current_offset += bytes_read) {
|
|
current_read_size = min_t(const int, read_size - total_read,
|
|
cifs_sb->rsize);
|
|
/* For windows me and 9x we do not want to request more
|
|
than it negotiated since it will refuse the read then */
|
|
if ((pTcon->ses) &&
|
|
!(pTcon->ses->capabilities & CAP_LARGE_FILES)) {
|
|
current_read_size = min_t(const int, current_read_size,
|
|
pTcon->ses->server->maxBuf - 128);
|
|
}
|
|
rc = -EAGAIN;
|
|
while (rc == -EAGAIN) {
|
|
if (open_file->invalidHandle) {
|
|
rc = cifs_reopen_file(open_file, true);
|
|
if (rc != 0)
|
|
break;
|
|
}
|
|
io_parms.netfid = open_file->netfid;
|
|
io_parms.pid = pid;
|
|
io_parms.tcon = pTcon;
|
|
io_parms.offset = *poffset;
|
|
io_parms.length = current_read_size;
|
|
rc = CIFSSMBRead(xid, &io_parms, &bytes_read,
|
|
¤t_offset, &buf_type);
|
|
}
|
|
if (rc || (bytes_read == 0)) {
|
|
if (total_read) {
|
|
break;
|
|
} else {
|
|
FreeXid(xid);
|
|
return rc;
|
|
}
|
|
} else {
|
|
cifs_stats_bytes_read(pTcon, total_read);
|
|
*poffset += bytes_read;
|
|
}
|
|
}
|
|
FreeXid(xid);
|
|
return total_read;
|
|
}
|
|
|
|
/*
|
|
* If the page is mmap'ed into a process' page tables, then we need to make
|
|
* sure that it doesn't change while being written back.
|
|
*/
|
|
static int
|
|
cifs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
|
|
{
|
|
struct page *page = vmf->page;
|
|
|
|
lock_page(page);
|
|
return VM_FAULT_LOCKED;
|
|
}
|
|
|
|
static struct vm_operations_struct cifs_file_vm_ops = {
|
|
.fault = filemap_fault,
|
|
.page_mkwrite = cifs_page_mkwrite,
|
|
};
|
|
|
|
int cifs_file_strict_mmap(struct file *file, struct vm_area_struct *vma)
|
|
{
|
|
int rc, xid;
|
|
struct inode *inode = file->f_path.dentry->d_inode;
|
|
|
|
xid = GetXid();
|
|
|
|
if (!CIFS_I(inode)->clientCanCacheRead) {
|
|
rc = cifs_invalidate_mapping(inode);
|
|
if (rc)
|
|
return rc;
|
|
}
|
|
|
|
rc = generic_file_mmap(file, vma);
|
|
if (rc == 0)
|
|
vma->vm_ops = &cifs_file_vm_ops;
|
|
FreeXid(xid);
|
|
return rc;
|
|
}
|
|
|
|
int cifs_file_mmap(struct file *file, struct vm_area_struct *vma)
|
|
{
|
|
int rc, xid;
|
|
|
|
xid = GetXid();
|
|
rc = cifs_revalidate_file(file);
|
|
if (rc) {
|
|
cFYI(1, "Validation prior to mmap failed, error=%d", rc);
|
|
FreeXid(xid);
|
|
return rc;
|
|
}
|
|
rc = generic_file_mmap(file, vma);
|
|
if (rc == 0)
|
|
vma->vm_ops = &cifs_file_vm_ops;
|
|
FreeXid(xid);
|
|
return rc;
|
|
}
|
|
|
|
|
|
static void cifs_copy_cache_pages(struct address_space *mapping,
|
|
struct list_head *pages, int bytes_read, char *data)
|
|
{
|
|
struct page *page;
|
|
char *target;
|
|
|
|
while (bytes_read > 0) {
|
|
if (list_empty(pages))
|
|
break;
|
|
|
|
page = list_entry(pages->prev, struct page, lru);
|
|
list_del(&page->lru);
|
|
|
|
if (add_to_page_cache_lru(page, mapping, page->index,
|
|
GFP_KERNEL)) {
|
|
page_cache_release(page);
|
|
cFYI(1, "Add page cache failed");
|
|
data += PAGE_CACHE_SIZE;
|
|
bytes_read -= PAGE_CACHE_SIZE;
|
|
continue;
|
|
}
|
|
page_cache_release(page);
|
|
|
|
target = kmap_atomic(page, KM_USER0);
|
|
|
|
if (PAGE_CACHE_SIZE > bytes_read) {
|
|
memcpy(target, data, bytes_read);
|
|
/* zero the tail end of this partial page */
|
|
memset(target + bytes_read, 0,
|
|
PAGE_CACHE_SIZE - bytes_read);
|
|
bytes_read = 0;
|
|
} else {
|
|
memcpy(target, data, PAGE_CACHE_SIZE);
|
|
bytes_read -= PAGE_CACHE_SIZE;
|
|
}
|
|
kunmap_atomic(target, KM_USER0);
|
|
|
|
flush_dcache_page(page);
|
|
SetPageUptodate(page);
|
|
unlock_page(page);
|
|
data += PAGE_CACHE_SIZE;
|
|
|
|
/* add page to FS-Cache */
|
|
cifs_readpage_to_fscache(mapping->host, page);
|
|
}
|
|
return;
|
|
}
|
|
|
|
static int cifs_readpages(struct file *file, struct address_space *mapping,
|
|
struct list_head *page_list, unsigned num_pages)
|
|
{
|
|
int rc = -EACCES;
|
|
int xid;
|
|
loff_t offset;
|
|
struct page *page;
|
|
struct cifs_sb_info *cifs_sb;
|
|
struct cifs_tcon *pTcon;
|
|
unsigned int bytes_read = 0;
|
|
unsigned int read_size, i;
|
|
char *smb_read_data = NULL;
|
|
struct smb_com_read_rsp *pSMBr;
|
|
struct cifsFileInfo *open_file;
|
|
struct cifs_io_parms io_parms;
|
|
int buf_type = CIFS_NO_BUFFER;
|
|
__u32 pid;
|
|
|
|
xid = GetXid();
|
|
if (file->private_data == NULL) {
|
|
rc = -EBADF;
|
|
FreeXid(xid);
|
|
return rc;
|
|
}
|
|
open_file = file->private_data;
|
|
cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
|
|
pTcon = tlink_tcon(open_file->tlink);
|
|
|
|
/*
|
|
* Reads as many pages as possible from fscache. Returns -ENOBUFS
|
|
* immediately if the cookie is negative
|
|
*/
|
|
rc = cifs_readpages_from_fscache(mapping->host, mapping, page_list,
|
|
&num_pages);
|
|
if (rc == 0)
|
|
goto read_complete;
|
|
|
|
cFYI(DBG2, "rpages: num pages %d", num_pages);
|
|
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
|
|
pid = open_file->pid;
|
|
else
|
|
pid = current->tgid;
|
|
|
|
for (i = 0; i < num_pages; ) {
|
|
unsigned contig_pages;
|
|
struct page *tmp_page;
|
|
unsigned long expected_index;
|
|
|
|
if (list_empty(page_list))
|
|
break;
|
|
|
|
page = list_entry(page_list->prev, struct page, lru);
|
|
offset = (loff_t)page->index << PAGE_CACHE_SHIFT;
|
|
|
|
/* count adjacent pages that we will read into */
|
|
contig_pages = 0;
|
|
expected_index =
|
|
list_entry(page_list->prev, struct page, lru)->index;
|
|
list_for_each_entry_reverse(tmp_page, page_list, lru) {
|
|
if (tmp_page->index == expected_index) {
|
|
contig_pages++;
|
|
expected_index++;
|
|
} else
|
|
break;
|
|
}
|
|
if (contig_pages + i > num_pages)
|
|
contig_pages = num_pages - i;
|
|
|
|
/* for reads over a certain size could initiate async
|
|
read ahead */
|
|
|
|
read_size = contig_pages * PAGE_CACHE_SIZE;
|
|
/* Read size needs to be in multiples of one page */
|
|
read_size = min_t(const unsigned int, read_size,
|
|
cifs_sb->rsize & PAGE_CACHE_MASK);
|
|
cFYI(DBG2, "rpages: read size 0x%x contiguous pages %d",
|
|
read_size, contig_pages);
|
|
rc = -EAGAIN;
|
|
while (rc == -EAGAIN) {
|
|
if (open_file->invalidHandle) {
|
|
rc = cifs_reopen_file(open_file, true);
|
|
if (rc != 0)
|
|
break;
|
|
}
|
|
io_parms.netfid = open_file->netfid;
|
|
io_parms.pid = pid;
|
|
io_parms.tcon = pTcon;
|
|
io_parms.offset = offset;
|
|
io_parms.length = read_size;
|
|
rc = CIFSSMBRead(xid, &io_parms, &bytes_read,
|
|
&smb_read_data, &buf_type);
|
|
/* BB more RC checks ? */
|
|
if (rc == -EAGAIN) {
|
|
if (smb_read_data) {
|
|
if (buf_type == CIFS_SMALL_BUFFER)
|
|
cifs_small_buf_release(smb_read_data);
|
|
else if (buf_type == CIFS_LARGE_BUFFER)
|
|
cifs_buf_release(smb_read_data);
|
|
smb_read_data = NULL;
|
|
}
|
|
}
|
|
}
|
|
if ((rc < 0) || (smb_read_data == NULL)) {
|
|
cFYI(1, "Read error in readpages: %d", rc);
|
|
break;
|
|
} else if (bytes_read > 0) {
|
|
task_io_account_read(bytes_read);
|
|
pSMBr = (struct smb_com_read_rsp *)smb_read_data;
|
|
cifs_copy_cache_pages(mapping, page_list, bytes_read,
|
|
smb_read_data + 4 /* RFC1001 hdr */ +
|
|
le16_to_cpu(pSMBr->DataOffset));
|
|
|
|
i += bytes_read >> PAGE_CACHE_SHIFT;
|
|
cifs_stats_bytes_read(pTcon, bytes_read);
|
|
if ((bytes_read & PAGE_CACHE_MASK) != bytes_read) {
|
|
i++; /* account for partial page */
|
|
|
|
/* server copy of file can have smaller size
|
|
than client */
|
|
/* BB do we need to verify this common case ?
|
|
this case is ok - if we are at server EOF
|
|
we will hit it on next read */
|
|
|
|
/* break; */
|
|
}
|
|
} else {
|
|
cFYI(1, "No bytes read (%d) at offset %lld . "
|
|
"Cleaning remaining pages from readahead list",
|
|
bytes_read, offset);
|
|
/* BB turn off caching and do new lookup on
|
|
file size at server? */
|
|
break;
|
|
}
|
|
if (smb_read_data) {
|
|
if (buf_type == CIFS_SMALL_BUFFER)
|
|
cifs_small_buf_release(smb_read_data);
|
|
else if (buf_type == CIFS_LARGE_BUFFER)
|
|
cifs_buf_release(smb_read_data);
|
|
smb_read_data = NULL;
|
|
}
|
|
bytes_read = 0;
|
|
}
|
|
|
|
/* need to free smb_read_data buf before exit */
|
|
if (smb_read_data) {
|
|
if (buf_type == CIFS_SMALL_BUFFER)
|
|
cifs_small_buf_release(smb_read_data);
|
|
else if (buf_type == CIFS_LARGE_BUFFER)
|
|
cifs_buf_release(smb_read_data);
|
|
smb_read_data = NULL;
|
|
}
|
|
|
|
read_complete:
|
|
FreeXid(xid);
|
|
return rc;
|
|
}
|
|
|
|
static int cifs_readpage_worker(struct file *file, struct page *page,
|
|
loff_t *poffset)
|
|
{
|
|
char *read_data;
|
|
int rc;
|
|
|
|
/* Is the page cached? */
|
|
rc = cifs_readpage_from_fscache(file->f_path.dentry->d_inode, page);
|
|
if (rc == 0)
|
|
goto read_complete;
|
|
|
|
page_cache_get(page);
|
|
read_data = kmap(page);
|
|
/* for reads over a certain size could initiate async read ahead */
|
|
|
|
rc = cifs_read(file, read_data, PAGE_CACHE_SIZE, poffset);
|
|
|
|
if (rc < 0)
|
|
goto io_error;
|
|
else
|
|
cFYI(1, "Bytes read %d", rc);
|
|
|
|
file->f_path.dentry->d_inode->i_atime =
|
|
current_fs_time(file->f_path.dentry->d_inode->i_sb);
|
|
|
|
if (PAGE_CACHE_SIZE > rc)
|
|
memset(read_data + rc, 0, PAGE_CACHE_SIZE - rc);
|
|
|
|
flush_dcache_page(page);
|
|
SetPageUptodate(page);
|
|
|
|
/* send this page to the cache */
|
|
cifs_readpage_to_fscache(file->f_path.dentry->d_inode, page);
|
|
|
|
rc = 0;
|
|
|
|
io_error:
|
|
kunmap(page);
|
|
page_cache_release(page);
|
|
|
|
read_complete:
|
|
return rc;
|
|
}
|
|
|
|
static int cifs_readpage(struct file *file, struct page *page)
|
|
{
|
|
loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT;
|
|
int rc = -EACCES;
|
|
int xid;
|
|
|
|
xid = GetXid();
|
|
|
|
if (file->private_data == NULL) {
|
|
rc = -EBADF;
|
|
FreeXid(xid);
|
|
return rc;
|
|
}
|
|
|
|
cFYI(1, "readpage %p at offset %d 0x%x\n",
|
|
page, (int)offset, (int)offset);
|
|
|
|
rc = cifs_readpage_worker(file, page, &offset);
|
|
|
|
unlock_page(page);
|
|
|
|
FreeXid(xid);
|
|
return rc;
|
|
}
|
|
|
|
static int is_inode_writable(struct cifsInodeInfo *cifs_inode)
|
|
{
|
|
struct cifsFileInfo *open_file;
|
|
|
|
spin_lock(&cifs_file_list_lock);
|
|
list_for_each_entry(open_file, &cifs_inode->openFileList, flist) {
|
|
if (OPEN_FMODE(open_file->f_flags) & FMODE_WRITE) {
|
|
spin_unlock(&cifs_file_list_lock);
|
|
return 1;
|
|
}
|
|
}
|
|
spin_unlock(&cifs_file_list_lock);
|
|
return 0;
|
|
}
|
|
|
|
/* We do not want to update the file size from server for inodes
|
|
open for write - to avoid races with writepage extending
|
|
the file - in the future we could consider allowing
|
|
refreshing the inode only on increases in the file size
|
|
but this is tricky to do without racing with writebehind
|
|
page caching in the current Linux kernel design */
|
|
bool is_size_safe_to_change(struct cifsInodeInfo *cifsInode, __u64 end_of_file)
|
|
{
|
|
if (!cifsInode)
|
|
return true;
|
|
|
|
if (is_inode_writable(cifsInode)) {
|
|
/* This inode is open for write at least once */
|
|
struct cifs_sb_info *cifs_sb;
|
|
|
|
cifs_sb = CIFS_SB(cifsInode->vfs_inode.i_sb);
|
|
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
|
|
/* since no page cache to corrupt on directio
|
|
we can change size safely */
|
|
return true;
|
|
}
|
|
|
|
if (i_size_read(&cifsInode->vfs_inode) < end_of_file)
|
|
return true;
|
|
|
|
return false;
|
|
} else
|
|
return true;
|
|
}
|
|
|
|
static int cifs_write_begin(struct file *file, struct address_space *mapping,
|
|
loff_t pos, unsigned len, unsigned flags,
|
|
struct page **pagep, void **fsdata)
|
|
{
|
|
pgoff_t index = pos >> PAGE_CACHE_SHIFT;
|
|
loff_t offset = pos & (PAGE_CACHE_SIZE - 1);
|
|
loff_t page_start = pos & PAGE_MASK;
|
|
loff_t i_size;
|
|
struct page *page;
|
|
int rc = 0;
|
|
|
|
cFYI(1, "write_begin from %lld len %d", (long long)pos, len);
|
|
|
|
page = grab_cache_page_write_begin(mapping, index, flags);
|
|
if (!page) {
|
|
rc = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
if (PageUptodate(page))
|
|
goto out;
|
|
|
|
/*
|
|
* If we write a full page it will be up to date, no need to read from
|
|
* the server. If the write is short, we'll end up doing a sync write
|
|
* instead.
|
|
*/
|
|
if (len == PAGE_CACHE_SIZE)
|
|
goto out;
|
|
|
|
/*
|
|
* optimize away the read when we have an oplock, and we're not
|
|
* expecting to use any of the data we'd be reading in. That
|
|
* is, when the page lies beyond the EOF, or straddles the EOF
|
|
* and the write will cover all of the existing data.
|
|
*/
|
|
if (CIFS_I(mapping->host)->clientCanCacheRead) {
|
|
i_size = i_size_read(mapping->host);
|
|
if (page_start >= i_size ||
|
|
(offset == 0 && (pos + len) >= i_size)) {
|
|
zero_user_segments(page, 0, offset,
|
|
offset + len,
|
|
PAGE_CACHE_SIZE);
|
|
/*
|
|
* PageChecked means that the parts of the page
|
|
* to which we're not writing are considered up
|
|
* to date. Once the data is copied to the
|
|
* page, it can be set uptodate.
|
|
*/
|
|
SetPageChecked(page);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
if ((file->f_flags & O_ACCMODE) != O_WRONLY) {
|
|
/*
|
|
* might as well read a page, it is fast enough. If we get
|
|
* an error, we don't need to return it. cifs_write_end will
|
|
* do a sync write instead since PG_uptodate isn't set.
|
|
*/
|
|
cifs_readpage_worker(file, page, &page_start);
|
|
} else {
|
|
/* we could try using another file handle if there is one -
|
|
but how would we lock it to prevent close of that handle
|
|
racing with this read? In any case
|
|
this will be written out by write_end so is fine */
|
|
}
|
|
out:
|
|
*pagep = page;
|
|
return rc;
|
|
}
|
|
|
|
static int cifs_release_page(struct page *page, gfp_t gfp)
|
|
{
|
|
if (PagePrivate(page))
|
|
return 0;
|
|
|
|
return cifs_fscache_release_page(page, gfp);
|
|
}
|
|
|
|
static void cifs_invalidate_page(struct page *page, unsigned long offset)
|
|
{
|
|
struct cifsInodeInfo *cifsi = CIFS_I(page->mapping->host);
|
|
|
|
if (offset == 0)
|
|
cifs_fscache_invalidate_page(page, &cifsi->vfs_inode);
|
|
}
|
|
|
|
static int cifs_launder_page(struct page *page)
|
|
{
|
|
int rc = 0;
|
|
loff_t range_start = page_offset(page);
|
|
loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1);
|
|
struct writeback_control wbc = {
|
|
.sync_mode = WB_SYNC_ALL,
|
|
.nr_to_write = 0,
|
|
.range_start = range_start,
|
|
.range_end = range_end,
|
|
};
|
|
|
|
cFYI(1, "Launder page: %p", page);
|
|
|
|
if (clear_page_dirty_for_io(page))
|
|
rc = cifs_writepage_locked(page, &wbc);
|
|
|
|
cifs_fscache_invalidate_page(page, page->mapping->host);
|
|
return rc;
|
|
}
|
|
|
|
void cifs_oplock_break(struct work_struct *work)
|
|
{
|
|
struct cifsFileInfo *cfile = container_of(work, struct cifsFileInfo,
|
|
oplock_break);
|
|
struct inode *inode = cfile->dentry->d_inode;
|
|
struct cifsInodeInfo *cinode = CIFS_I(inode);
|
|
int rc = 0;
|
|
|
|
if (inode && S_ISREG(inode->i_mode)) {
|
|
if (cinode->clientCanCacheRead)
|
|
break_lease(inode, O_RDONLY);
|
|
else
|
|
break_lease(inode, O_WRONLY);
|
|
rc = filemap_fdatawrite(inode->i_mapping);
|
|
if (cinode->clientCanCacheRead == 0) {
|
|
rc = filemap_fdatawait(inode->i_mapping);
|
|
mapping_set_error(inode->i_mapping, rc);
|
|
invalidate_remote_inode(inode);
|
|
}
|
|
cFYI(1, "Oplock flush inode %p rc %d", inode, rc);
|
|
}
|
|
|
|
/*
|
|
* releasing stale oplock after recent reconnect of smb session using
|
|
* a now incorrect file handle is not a data integrity issue but do
|
|
* not bother sending an oplock release if session to server still is
|
|
* disconnected since oplock already released by the server
|
|
*/
|
|
if (!cfile->oplock_break_cancelled) {
|
|
rc = CIFSSMBLock(0, tlink_tcon(cfile->tlink), cfile->netfid, 0,
|
|
0, 0, 0, LOCKING_ANDX_OPLOCK_RELEASE, false,
|
|
cinode->clientCanCacheRead ? 1 : 0);
|
|
cFYI(1, "Oplock release rc = %d", rc);
|
|
}
|
|
|
|
/*
|
|
* We might have kicked in before is_valid_oplock_break()
|
|
* finished grabbing reference for us. Make sure it's done by
|
|
* waiting for cifs_file_list_lock.
|
|
*/
|
|
spin_lock(&cifs_file_list_lock);
|
|
spin_unlock(&cifs_file_list_lock);
|
|
|
|
cifs_oplock_break_put(cfile);
|
|
}
|
|
|
|
/* must be called while holding cifs_file_list_lock */
|
|
void cifs_oplock_break_get(struct cifsFileInfo *cfile)
|
|
{
|
|
cifs_sb_active(cfile->dentry->d_sb);
|
|
cifsFileInfo_get(cfile);
|
|
}
|
|
|
|
void cifs_oplock_break_put(struct cifsFileInfo *cfile)
|
|
{
|
|
struct super_block *sb = cfile->dentry->d_sb;
|
|
|
|
cifsFileInfo_put(cfile);
|
|
cifs_sb_deactive(sb);
|
|
}
|
|
|
|
const struct address_space_operations cifs_addr_ops = {
|
|
.readpage = cifs_readpage,
|
|
.readpages = cifs_readpages,
|
|
.writepage = cifs_writepage,
|
|
.writepages = cifs_writepages,
|
|
.write_begin = cifs_write_begin,
|
|
.write_end = cifs_write_end,
|
|
.set_page_dirty = __set_page_dirty_nobuffers,
|
|
.releasepage = cifs_release_page,
|
|
.invalidatepage = cifs_invalidate_page,
|
|
.launder_page = cifs_launder_page,
|
|
};
|
|
|
|
/*
|
|
* cifs_readpages requires the server to support a buffer large enough to
|
|
* contain the header plus one complete page of data. Otherwise, we need
|
|
* to leave cifs_readpages out of the address space operations.
|
|
*/
|
|
const struct address_space_operations cifs_addr_ops_smallbuf = {
|
|
.readpage = cifs_readpage,
|
|
.writepage = cifs_writepage,
|
|
.writepages = cifs_writepages,
|
|
.write_begin = cifs_write_begin,
|
|
.write_end = cifs_write_end,
|
|
.set_page_dirty = __set_page_dirty_nobuffers,
|
|
.releasepage = cifs_release_page,
|
|
.invalidatepage = cifs_invalidate_page,
|
|
.launder_page = cifs_launder_page,
|
|
};
|