<commit_before>/*
 *   fs/cifs/inode.c
 *
 *   Copyright (C) International Business Machines  Corp., 2002,2010
 *   Author(s): <NAME> (<EMAIL>)
 *
 *   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 "fscache.h"


static void cifs_set_ops(struct inode *inode)
{
	struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);

	switch (inode->i_mode & S_IFMT) {
	case S_IFREG:
		inode->i_op = &cifs_file_inode_ops;
		if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
			if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
				inode->i_fop = &cifs_file_direct_nobrl_ops;
			else
				inode->i_fop = &cifs_file_direct_ops;
		} else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO) {
			if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
				inode->i_fop = &cifs_file_strict_nobrl_ops;
			else
				inode->i_fop = &cifs_file_strict_ops;
		} else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
			inode->i_fop = &cifs_file_nobrl_ops;
		else { /* not direct, send byte range locks */
			inode->i_fop = &cifs_file_ops;
		}

		/* check if server can support readpages */
		if (cifs_sb_master_tcon(cifs_sb)->ses->server->maxBuf <
				PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE)
			inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
		else
			inode->i_data.a_ops = &cifs_addr_ops;
		break;
	case S_IFDIR:
#ifdef CONFIG_CIFS_DFS_UPCALL
		if (IS_AUTOMOUNT(inode)) {
			inode->i_op = &cifs_dfs_referral_inode_operations;
		} else {
#else /* NO DFS support, treat as a directory */
		{
#endif
			inode->i_op = &cifs_dir_inode_ops;
			inode->i_fop = &cifs_dir_ops;
		}
		break;
	case S_IFLNK:
		inode->i_op = &cifs_symlink_inode_ops;
		break;
	default:
		init_special_inode(inode, inode->i_mode, inode->i_rdev);
		break;
	}
}

/* check inode attributes against fattr. If they don't match, tag the
 * inode for cache invalidation
 */
static void
cifs_revalidate_cache(struct inode *inode, struct cifs_fattr *fattr)
{
	struct cifsInodeInfo *cifs_i = CIFS_I(inode);

	cifs_dbg(FYI, "%s: revalidating inode %llu\n",
		 __func__, cifs_i->uniqueid);

	if (inode->i_state & I_NEW) {
		cifs_dbg(FYI, "%s: inode %llu is new\n",
			 __func__, cifs_i->uniqueid);
		return;
	}

	/* don't bother with revalidation if we have an oplock */
	if (cifs_i->clientCanCacheRead) {
		cifs_dbg(FYI, "%s: inode %llu is oplocked\n",
			 __func__, cifs_i->uniqueid);
		return;
	}

	 /* revalidate if mtime or size have changed */
	if (timespec_equal(&inode->i_mtime, &fattr->cf_mtime) &&
	    cifs_i->server_eof == fattr->cf_eof) {
		cifs_dbg(FYI, "%s: inode %llu is unchanged\n",
			 __func__, cifs_i->uniqueid);
		return;
	}

	cifs_dbg(FYI, "%s: invalidating inode %llu mapping\n",
		 __func__, cifs_i->uniqueid);
	cifs_i->invalid_mapping = true;
}

/* populate an inode with info from a cifs_fattr struct */
void
cifs_fattr_to_inode(struct inode *inode, struct cifs_fattr *fattr)
{
	struct cifsInodeInfo *cifs_i = CIFS_I(inode);
	struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);

	cifs_revalidate_cache(inode, fattr);

	spin_lock(&inode->i_lock);
	inode->i_atime = fattr->cf_atime;
	inode->i_mtime = fattr->cf_mtime;
	inode->i_ctime = fattr->cf_ctime;
	inode->i_rdev = fattr->cf_rdev;
	set_nlink(inode, fattr->cf_nlink);
	inode->i_uid = fattr->cf_uid;
	inode->i_gid = fattr->cf_gid;

	/* if dynperm is set, don't clobber existing mode */
	if (inode->i_state & I_NEW ||
	    !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM))
		inode->i_mode = fattr->cf_mode;

	cifs_i->cifsAttrs = fattr->cf_cifsattrs;

	if (fattr->cf_flags & CIFS_FATTR_NEED_REVAL)
		cifs_i->time = 0;
	else
		cifs_i->time = jiffies;

	cifs_i->delete_pending = fattr->cf_flags & CIFS_FATTR_DELETE_PENDING;

	cifs_i->server_eof = fattr->cf_eof;
	/*
	 * Can't safely change the file size here if the client is writing to
	 * it due to potential races.
	 */
	if (is_size_safe_to_change(cifs_i, fattr->cf_eof)) {
		i_size_write(inode, fattr->cf_eof);

		/*
		 * i_blocks is not related to (i_size / i_blksize),
		 * but instead 512 byte (2**9) size is required for
		 * calculating num blocks.
		 */
		inode->i_blocks = (512 - 1 + fattr->cf_bytes) >> 9;
	}
	spin_unlock(&inode->i_lock);

	if (fattr->cf_flags & CIFS_FATTR_DFS_REFERRAL)
		inode->i_flags |= S_AUTOMOUNT;
	cifs_set_ops(inode);
}

void
cifs_fill_uniqueid(struct super_block *sb, struct cifs_fattr *fattr)
{
	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);

	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
		return;

	fattr->cf_uniqueid = iunique(sb, ROOT_I);
}

/* Fill a cifs_fattr struct with info from FILE_UNIX_BASIC_INFO. */
void
cifs_unix_basic_to_fattr(struct cifs_fattr *fattr, FILE_UNIX_BASIC_INFO *info,
			 struct cifs_sb_info *cifs_sb)
{
	memset(fattr, 0, sizeof(*fattr));
	fattr->cf_uniqueid = le64_to_cpu(info->UniqueId);
	fattr->cf_bytes = le64_to_cpu(info->NumOfBytes);
	fattr->cf_eof = le64_to_cpu(info->EndOfFile);

	fattr->cf_atime = cifs_NTtimeToUnix(info->LastAccessTime);<commit_msg>cifs: only set ops for inodes in I_NEW state<commit_after>/*
 *   fs/cifs/inode.c
 *
 *   Copyright (C) International Business Machines  Corp., 2002,2010
 *   Author(s): <NAME> (<EMAIL>)
 *
 *   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 "fscache.h"


static void cifs_set_ops(struct inode *inode)
{
	struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);

	switch (inode->i_mode & S_IFMT) {
	case S_IFREG:
		inode->i_op = &cifs_file_inode_ops;
		if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
			if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
				inode->i_fop = &cifs_file_direct_nobrl_ops;
			else
				inode->i_fop = &cifs_file_direct_ops;
		} else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO) {
			if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
				inode->i_fop = &cifs_file_strict_nobrl_ops;
			else
				inode->i_fop = &cifs_file_strict_ops;
		} else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
			inode->i_fop = &cifs_file_nobrl_ops;
		else { /* not direct, send byte range locks */
			inode->i_fop = &cifs_file_ops;
		}

		/* check if server can support readpages */
		if (cifs_sb_master_tcon(cifs_sb)->ses->server->maxBuf <
				PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE)
			inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
		else
			inode->i_data.a_ops = &cifs_addr_ops;
		break;
	case S_IFDIR:
#ifdef CONFIG_CIFS_DFS_UPCALL
		if (IS_AUTOMOUNT(inode)) {
			inode->i_op = &cifs_dfs_referral_inode_operations;
		} else {
#else /* NO DFS support, treat as a directory */
		{
#endif
			inode->i_op = &cifs_dir_inode_ops;
			inode->i_fop = &cifs_dir_ops;
		}
		break;
	case S_IFLNK:
		inode->i_op = &cifs_symlink_inode_ops;
		break;
	default:
		init_special_inode(inode, inode->i_mode, inode->i_rdev);
		break;
	}
}

/* check inode attributes against fattr. If they don't match, tag the
 * inode for cache invalidation
 */
static void
cifs_revalidate_cache(struct inode *inode, struct cifs_fattr *fattr)
{
	struct cifsInodeInfo *cifs_i = CIFS_I(inode);

	cifs_dbg(FYI, "%s: revalidating inode %llu\n",
		 __func__, cifs_i->uniqueid);

	if (inode->i_state & I_NEW) {
		cifs_dbg(FYI, "%s: inode %llu is new\n",
			 __func__, cifs_i->uniqueid);
		return;
	}

	/* don't bother with revalidation if we have an oplock */
	if (cifs_i->clientCanCacheRead) {
		cifs_dbg(FYI, "%s: inode %llu is oplocked\n",
			 __func__, cifs_i->uniqueid);
		return;
	}

	 /* revalidate if mtime or size have changed */
	if (timespec_equal(&inode->i_mtime, &fattr->cf_mtime) &&
	    cifs_i->server_eof == fattr->cf_eof) {
		cifs_dbg(FYI, "%s: inode %llu is unchanged\n",
			 __func__, cifs_i->uniqueid);
		return;
	}

	cifs_dbg(FYI, "%s: invalidating inode %llu mapping\n",
		 __func__, cifs_i->uniqueid);
	cifs_i->invalid_mapping = true;
}

/* populate an inode with info from a cifs_fattr struct */
void
cifs_fattr_to_inode(struct inode *inode, struct cifs_fattr *fattr)
{
	struct cifsInodeInfo *cifs_i = CIFS_I(inode);
	struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);

	cifs_revalidate_cache(inode, fattr);

	spin_lock(&inode->i_lock);
	inode->i_atime = fattr->cf_atime;
	inode->i_mtime = fattr->cf_mtime;
	inode->i_ctime = fattr->cf_ctime;
	inode->i_rdev = fattr->cf_rdev;
	set_nlink(inode, fattr->cf_nlink);
	inode->i_uid = fattr->cf_uid;
	inode->i_gid = fattr->cf_gid;

	/* if dynperm is set, don't clobber existing mode */
	if (inode->i_state & I_NEW ||
	    !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM))
		inode->i_mode = fattr->cf_mode;

	cifs_i->cifsAttrs = fattr->cf_cifsattrs;

	if (fattr->cf_flags & CIFS_FATTR_NEED_REVAL)
		cifs_i->time = 0;
	else
		cifs_i->time = jiffies;

	cifs_i->delete_pending = fattr->cf_flags & CIFS_FATTR_DELETE_PENDING;

	cifs_i->server_eof = fattr->cf_eof;
	/*
	 * Can't safely change the file size here if the client is writing to
	 * it due to potential races.
	 */
	if (is_size_safe_to_change(cifs_i, fattr->cf_eof)) {
		i_size_write(inode, fattr->cf_eof);

		/*
		 * i_blocks is not related to (i_size / i_blksize),
		 * but instead 512 byte (2**9) size is required for
		 * calculating num blocks.
		 */
		inode->i_blocks = (512 - 1 + fattr->cf_bytes) >> 9;
	}
	spin_unlock(&inode->i_lock);

	if (fattr->cf_flags & CIFS_FATTR_DFS_REFERRAL)
		inode->i_flags |= S_AUTOMOUNT;
	if (inode->i_state & I_NEW)
		cifs_set_ops(inode);
}

void
cifs_fill_uniqueid(struct super_block *sb, struct cifs_fattr *fattr)
{
	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);

	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
		return;

	fattr->cf_uniqueid = iunique(sb, ROOT_I);
}

/* Fill a cifs_fattr struct with info from FILE_UNIX_BASIC_INFO. */
void
cifs_unix_basic_to_fattr(struct cifs_fattr *fattr, FILE_UNIX_BASIC_INFO *info,
			 struct cifs_sb_info *cifs_sb)
{
	memset(fattr, 0, sizeof(*fattr));
	fattr->cf_uniqueid = le64_to_cpu(info->UniqueId);
	fattr->cf_bytes = le64_to_cpu(info->NumOfBytes);
	fattr->cf_eof = le64_to_cpu(info->EndOfFile);

	fattr->cf_atime = cifs_NTtimeToUnix(info->LastAccessTime);
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