Exemplo n.º 1
0
static int f2fs_insert_range(struct inode *inode, loff_t offset, loff_t len)
{
	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
	pgoff_t pg_start, pg_end, delta, nrpages, idx;
	loff_t new_size;
	int ret = 0;

	new_size = i_size_read(inode) + len;
	if (new_size > inode->i_sb->s_maxbytes)
		return -EFBIG;

	if (offset >= i_size_read(inode))
		return -EINVAL;

	/* insert range should be aligned to block size of f2fs. */
	if (offset & (F2FS_BLKSIZE - 1) || len & (F2FS_BLKSIZE - 1))
		return -EINVAL;

	f2fs_balance_fs(sbi);

	if (f2fs_has_inline_data(inode)) {
		ret = f2fs_convert_inline_inode(inode);
		if (ret)
			return ret;
	}

	ret = truncate_blocks(inode, i_size_read(inode), true);
	if (ret)
		return ret;

	/* write out all dirty pages from offset */
	ret = filemap_write_and_wait_range(inode->i_mapping, offset, LLONG_MAX);
	if (ret)
		return ret;

	truncate_pagecache(inode, 0, offset);

	pg_start = offset >> PAGE_CACHE_SHIFT;
	pg_end = (offset + len) >> PAGE_CACHE_SHIFT;
	delta = pg_end - pg_start;
	nrpages = (i_size_read(inode) + PAGE_SIZE - 1) / PAGE_SIZE;

	for (idx = nrpages - 1; idx >= pg_start && idx != -1; idx--) {
		f2fs_lock_op(sbi);
		ret = __exchange_data_block(inode, idx, idx + delta, false);
		f2fs_unlock_op(sbi);
		if (ret)
			break;
	}

	/* write out all moved pages, if possible */
	filemap_write_and_wait_range(inode->i_mapping, offset, LLONG_MAX);
	truncate_pagecache(inode, 0, offset);

	if (!ret)
		i_size_write(inode, new_size);
	return ret;
}
Exemplo n.º 2
0
static int f2fs_collapse_range(struct inode *inode, loff_t offset, loff_t len)
{
	pgoff_t pg_start, pg_end;
	loff_t new_size;
	int ret;

	if (offset + len >= i_size_read(inode))
		return -EINVAL;

	/* collapse range should be aligned to block size of f2fs. */
	if (offset & (F2FS_BLKSIZE - 1) || len & (F2FS_BLKSIZE - 1))
		return -EINVAL;

	f2fs_balance_fs(F2FS_I_SB(inode));

	if (f2fs_has_inline_data(inode)) {
		ret = f2fs_convert_inline_inode(inode);
		if (ret)
			return ret;
	}

	pg_start = offset >> PAGE_CACHE_SHIFT;
	pg_end = (offset + len) >> PAGE_CACHE_SHIFT;

	/* write out all dirty pages from offset */
	ret = filemap_write_and_wait_range(inode->i_mapping, offset, LLONG_MAX);
	if (ret)
		return ret;

	truncate_pagecache(inode, 0, offset);

	ret = f2fs_do_collapse(inode, pg_start, pg_end);
	if (ret)
		return ret;

	/* write out all moved pages, if possible */
	filemap_write_and_wait_range(inode->i_mapping, offset, LLONG_MAX);
	truncate_pagecache(inode, 0, offset);

	new_size = i_size_read(inode) - len;
	truncate_pagecache(inode, 0, new_size);

	ret = truncate_blocks(inode, new_size, true);
	if (!ret)
		i_size_write(inode, new_size);

	return ret;
}
Exemplo n.º 3
0
void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr,
			    u64 attr_valid, u64 attr_version)
{
	struct fuse_conn *fc = get_fuse_conn(inode);
	struct fuse_inode *fi = get_fuse_inode(inode);
	loff_t oldsize;

	spin_lock(&fc->lock);
	if (attr_version != 0 && fi->attr_version > attr_version) {
		spin_unlock(&fc->lock);
		return;
	}

	fuse_change_attributes_common(inode, attr, attr_valid);

	oldsize = inode->i_size;
	i_size_write(inode, attr->size);
	spin_unlock(&fc->lock);

	if (S_ISREG(inode->i_mode) && oldsize != attr->size) {
		lock_system_sleep();
		truncate_pagecache(inode, oldsize, attr->size);
		invalidate_inode_pages2(inode->i_mapping);
		unlock_system_sleep();
	}
}
Exemplo n.º 4
0
void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr,
                            u64 attr_valid, u64 attr_version)
{
    struct fuse_conn *fc = get_fuse_conn(inode);
    struct fuse_inode *fi = get_fuse_inode(inode);
    loff_t oldsize;

    spin_lock(&fc->lock);
    if ((attr_version != 0 && fi->attr_version > attr_version) ||
            test_bit(FUSE_I_SIZE_UNSTABLE, &fi->state)) {
        spin_unlock(&fc->lock);
        return;
    }

    fuse_change_attributes_common(inode, attr, attr_valid);

    oldsize = inode->i_size;
    i_size_write(inode, attr->size);
    spin_unlock(&fc->lock);

    if (S_ISREG(inode->i_mode) && oldsize != attr->size) {
        truncate_pagecache(inode, oldsize, attr->size);
        invalidate_inode_pages2(inode->i_mapping);
    }
}
void test(void)
{
   struct inode inode;
   loff_t oldSize = 0;
   loff_t newSize = 4096;

   truncate_pagecache(&inode, oldSize, newSize);
}
Exemplo n.º 6
0
void truncate_setsize(struct inode *inode, loff_t newsize)
{
	loff_t oldsize = inode->i_size;

	inode->i_size = newsize;
	if (newsize < oldsize)
		truncate_pagecache(inode, oldsize, newsize);
}
Exemplo n.º 7
0
static void ext2_write_failed(struct address_space *mapping, loff_t to)
{
	struct inode *inode = mapping->host;

	if (to > inode->i_size) {
		truncate_pagecache(inode, inode->i_size);
		ext2_truncate_blocks(inode, inode->i_size);
	}
}
Exemplo n.º 8
0
void nilfs_write_failed(struct address_space *mapping, loff_t to)
{
	struct inode *inode = mapping->host;

	if (to > inode->i_size) {
		truncate_pagecache(inode, inode->i_size);
		nilfs_truncate(inode);
	}
}
Exemplo n.º 9
0
static void hfsplus_write_failed(struct address_space *mapping, loff_t to)
{
	struct inode *inode = mapping->host;

	if (to > inode->i_size) {
		truncate_pagecache(inode, inode->i_size);
		hfsplus_file_truncate(inode);
	}
}
Exemplo n.º 10
0
/**
 * truncate_setsize - update inode and pagecache for a new file size
 * @inode: inode
 * @newsize: new file size
 *
 * truncate_setsize updates i_size and performs pagecache truncation (if
 * necessary) to @newsize. It will be typically be called from the filesystem's
 * setattr function when ATTR_SIZE is passed in.
 *
 * Must be called with a lock serializing truncates and writes (generally
 * i_mutex but e.g. xfs uses a different lock) and before all filesystem
 * specific block truncation has been performed.
 */
void truncate_setsize(struct inode *inode, loff_t newsize)
{
    loff_t oldsize = inode->i_size;

    i_size_write(inode, newsize);
    if (newsize > oldsize)
        pagecache_isize_extended(inode, oldsize, newsize);
    truncate_pagecache(inode, newsize);
}
Exemplo n.º 11
0
Arquivo: inode.c Projeto: nosway/sfs
static void sfs_write_failed(struct address_space *mapping, loff_t to)
{
	struct inode *inode = mapping->host;

	pr_debug("sfs_write_failed called.\n");
	if (to > inode->i_size) {
		truncate_pagecache(inode, inode->i_size);
		sfs_truncate(inode);
	}	
}
Exemplo n.º 12
0
void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr,
			    u64 attr_valid, u64 attr_version)
{
	struct fuse_conn *fc = get_fuse_conn(inode);
	struct fuse_inode *fi = get_fuse_inode(inode);
	bool is_wb = fc->writeback_cache;
	loff_t oldsize;
	struct timespec old_mtime;

	spin_lock(&fc->lock);
	if ((attr_version != 0 && fi->attr_version > attr_version) ||
	    test_bit(FUSE_I_SIZE_UNSTABLE, &fi->state)) {
		spin_unlock(&fc->lock);
		return;
	}

	old_mtime = inode->i_mtime;
	fuse_change_attributes_common(inode, attr, attr_valid);

	oldsize = inode->i_size;
	/*
	 * In case of writeback_cache enabled, the cached writes beyond EOF
	 * extend local i_size without keeping userspace server in sync. So,
	 * attr->size coming from server can be stale. We cannot trust it.
	 */
	if (!is_wb || !S_ISREG(inode->i_mode))
		i_size_write(inode, attr->size);
	spin_unlock(&fc->lock);

	if (!is_wb && S_ISREG(inode->i_mode)) {
		bool inval = false;

		if (oldsize != attr->size) {
			truncate_pagecache(inode, attr->size);
			inval = true;
		} else if (fc->auto_inval_data) {
			struct timespec new_mtime = {
				.tv_sec = attr->mtime,
				.tv_nsec = attr->mtimensec,
			};

			/*
			 * Auto inval mode also checks and invalidates if mtime
			 * has changed.
			 */
			if (!timespec_equal(&old_mtime, &new_mtime))
				inval = true;
		}

		if (inval)
			invalidate_inode_pages2(inode->i_mapping);
	}
}
Exemplo n.º 13
0
void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr,
			    u64 attr_valid, u64 attr_version)
{
	struct fuse_conn *fc = get_fuse_conn(inode);
	struct fuse_inode *fi = get_fuse_inode(inode);
	loff_t oldsize;
	struct timespec old_mtime;

	spin_lock(&fc->lock);
	if ((attr_version != 0 && fi->attr_version > attr_version) ||
	    test_bit(FUSE_I_SIZE_UNSTABLE, &fi->state)) {
		spin_unlock(&fc->lock);
		return;
	}

	old_mtime = inode->i_mtime;
	fuse_change_attributes_common(inode, attr, attr_valid);

	oldsize = inode->i_size;
	i_size_write(inode, attr->size);
	spin_unlock(&fc->lock);

	if (S_ISREG(inode->i_mode)) {
		bool inval = false;

		if (oldsize != attr->size) {
			truncate_pagecache(inode, oldsize, attr->size);
			inval = true;
		} else if (fc->auto_inval_data) {
			struct timespec new_mtime = {
				.tv_sec = attr->mtime,
				.tv_nsec = attr->mtimensec,
			};

			/*
			 * Auto inval mode also checks and invalidates if mtime
			 * has changed.
			 */
			if (!timespec_equal(&old_mtime, &new_mtime))
				inval = true;
		}

		if (inval)
			invalidate_inode_pages2(inode->i_mapping);
	}
}
Exemplo n.º 14
0
static int vvp_do_vmtruncate(struct inode *inode, size_t size)
{
	int     result;
	loff_t oldsize;

	/*
	 * Only ll_inode_size_lock is taken at this level.
	 */
	ll_inode_size_lock(inode);
	result = inode_newsize_ok(inode, size);
	if (result < 0) {
		ll_inode_size_unlock(inode);
		return result;
	}
	oldsize = inode->i_size;
	i_size_write(inode, size);

	truncate_pagecache(inode, oldsize, size);
	ll_inode_size_unlock(inode);
	return result;
}
Exemplo n.º 15
0
Arquivo: file.c Projeto: infidel/linux
static int f2fs_collapse_range(struct inode *inode, loff_t offset, loff_t len)
{
    pgoff_t pg_start, pg_end;
    loff_t new_size;
    int ret;

    if (!S_ISREG(inode->i_mode))
        return -EINVAL;

    if (offset + len >= i_size_read(inode))
        return -EINVAL;

    /* collapse range should be aligned to block size of f2fs. */
    if (offset & (F2FS_BLKSIZE - 1) || len & (F2FS_BLKSIZE - 1))
        return -EINVAL;

    pg_start = offset >> PAGE_CACHE_SHIFT;
    pg_end = (offset + len) >> PAGE_CACHE_SHIFT;

    /* write out all dirty pages from offset */
    ret = filemap_write_and_wait_range(inode->i_mapping, offset, LLONG_MAX);
    if (ret)
        return ret;

    truncate_pagecache(inode, offset);

    ret = f2fs_do_collapse(inode, pg_start, pg_end);
    if (ret)
        return ret;

    new_size = i_size_read(inode) - len;

    ret = truncate_blocks(inode, new_size, true);
    if (!ret)
        i_size_write(inode, new_size);

    return ret;
}
Exemplo n.º 16
0
/*
 * Set attributes, and at the same time refresh them.
 *
 * Truncation is slightly complicated, because the 'truncate' request
 * may fail, in which case we don't want to touch the mapping.
 * vmtruncate() doesn't allow for this case, so do the rlimit checking
 * and the actual truncation by hand.
 */
int fuse_do_setattr(struct inode *inode, struct iattr *attr,
		    struct file *file)
{
	struct fuse_conn *fc = get_fuse_conn(inode);
	struct fuse_req *req;
	struct fuse_setattr_in inarg;
	struct fuse_attr_out outarg;
	bool is_truncate = false;
	loff_t oldsize;
	int err;

	if (!(fc->flags & FUSE_DEFAULT_PERMISSIONS))
		attr->ia_valid |= ATTR_FORCE;

	err = inode_change_ok(inode, attr);
	if (err)
		return err;

	if (attr->ia_valid & ATTR_OPEN) {
		if (fc->atomic_o_trunc)
			return 0;
		file = NULL;
	}

	if (attr->ia_valid & ATTR_SIZE)
		is_truncate = true;

	req = fuse_get_req_nopages(fc);
	if (IS_ERR(req))
		return PTR_ERR(req);

	if (is_truncate)
		fuse_set_nowrite(inode);

	memset(&inarg, 0, sizeof(inarg));
	memset(&outarg, 0, sizeof(outarg));
	iattr_to_fattr(attr, &inarg);
	if (file) {
		struct fuse_file *ff = file->private_data;
		inarg.valid |= FATTR_FH;
		inarg.fh = ff->fh;
	}
	if (attr->ia_valid & ATTR_SIZE) {
		/* For mandatory locking in truncate */
		inarg.valid |= FATTR_LOCKOWNER;
		inarg.lock_owner = fuse_lock_owner_id(fc, current->files);
	}
	req->in.h.opcode = FUSE_SETATTR;
	req->in.h.nodeid = get_node_id(inode);
	req->in.numargs = 1;
	req->in.args[0].size = sizeof(inarg);
	req->in.args[0].value = &inarg;
	req->out.numargs = 1;
	if (fc->minor < 9)
		req->out.args[0].size = FUSE_COMPAT_ATTR_OUT_SIZE;
	else
		req->out.args[0].size = sizeof(outarg);
	req->out.args[0].value = &outarg;
	fuse_request_send(fc, req);
	err = req->out.h.error;
	fuse_put_request(fc, req);
	if (err) {
		if (err == -EINTR)
			fuse_invalidate_attr(inode);
		goto error;
	}

	if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) {
		make_bad_inode(inode);
		err = -EIO;
		goto error;
	}

	spin_lock(&fc->lock);
	fuse_change_attributes_common(inode, &outarg.attr,
				      attr_timeout(&outarg));
	oldsize = inode->i_size;
	i_size_write(inode, outarg.attr.size);

	if (is_truncate) {
		/* NOTE: this may release/reacquire fc->lock */
		__fuse_release_nowrite(inode);
	}
	spin_unlock(&fc->lock);

	/*
	 * Only call invalidate_inode_pages2() after removing
	 * FUSE_NOWRITE, otherwise fuse_launder_page() would deadlock.
	 */
	if (S_ISREG(inode->i_mode) && oldsize != outarg.attr.size) {
		truncate_pagecache(inode, oldsize, outarg.attr.size);
		invalidate_inode_pages2(inode->i_mapping);
	}

	return 0;

error:
	if (is_truncate)
		fuse_release_nowrite(inode);

	return err;
}
Exemplo n.º 17
0
Arquivo: dir.c Projeto: mkrufky/linux
/*
 * Set attributes, and at the same time refresh them.
 *
 * Truncation is slightly complicated, because the 'truncate' request
 * may fail, in which case we don't want to touch the mapping.
 * vmtruncate() doesn't allow for this case, so do the rlimit checking
 * and the actual truncation by hand.
 */
int fuse_do_setattr(struct dentry *dentry, struct iattr *attr,
		    struct file *file)
{
	struct inode *inode = d_inode(dentry);
	struct fuse_conn *fc = get_fuse_conn(inode);
	struct fuse_inode *fi = get_fuse_inode(inode);
	FUSE_ARGS(args);
	struct fuse_setattr_in inarg;
	struct fuse_attr_out outarg;
	bool is_truncate = false;
	bool is_wb = fc->writeback_cache;
	loff_t oldsize;
	int err;
	bool trust_local_cmtime = is_wb && S_ISREG(inode->i_mode);

	if (!fc->default_permissions)
		attr->ia_valid |= ATTR_FORCE;

	err = setattr_prepare(dentry, attr);
	if (err)
		return err;

	if (attr->ia_valid & ATTR_OPEN) {
		if (fc->atomic_o_trunc)
			return 0;
		file = NULL;
	}

	if (attr->ia_valid & ATTR_SIZE)
		is_truncate = true;

	if (is_truncate) {
		fuse_set_nowrite(inode);
		set_bit(FUSE_I_SIZE_UNSTABLE, &fi->state);
		if (trust_local_cmtime && attr->ia_size != inode->i_size)
			attr->ia_valid |= ATTR_MTIME | ATTR_CTIME;
	}

	memset(&inarg, 0, sizeof(inarg));
	memset(&outarg, 0, sizeof(outarg));
	iattr_to_fattr(attr, &inarg, trust_local_cmtime);
	if (file) {
		struct fuse_file *ff = file->private_data;
		inarg.valid |= FATTR_FH;
		inarg.fh = ff->fh;
	}
	if (attr->ia_valid & ATTR_SIZE) {
		/* For mandatory locking in truncate */
		inarg.valid |= FATTR_LOCKOWNER;
		inarg.lock_owner = fuse_lock_owner_id(fc, current->files);
	}
	fuse_setattr_fill(fc, &args, inode, &inarg, &outarg);
	err = fuse_simple_request(fc, &args);
	if (err) {
		if (err == -EINTR)
			fuse_invalidate_attr(inode);
		goto error;
	}

	if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) {
		make_bad_inode(inode);
		err = -EIO;
		goto error;
	}

	spin_lock(&fc->lock);
	/* the kernel maintains i_mtime locally */
	if (trust_local_cmtime) {
		if (attr->ia_valid & ATTR_MTIME)
			inode->i_mtime = attr->ia_mtime;
		if (attr->ia_valid & ATTR_CTIME)
			inode->i_ctime = attr->ia_ctime;
		/* FIXME: clear I_DIRTY_SYNC? */
	}

	fuse_change_attributes_common(inode, &outarg.attr,
				      attr_timeout(&outarg));
	oldsize = inode->i_size;
	/* see the comment in fuse_change_attributes() */
	if (!is_wb || is_truncate || !S_ISREG(inode->i_mode))
		i_size_write(inode, outarg.attr.size);

	if (is_truncate) {
		/* NOTE: this may release/reacquire fc->lock */
		__fuse_release_nowrite(inode);
	}
	spin_unlock(&fc->lock);

	/*
	 * Only call invalidate_inode_pages2() after removing
	 * FUSE_NOWRITE, otherwise fuse_launder_page() would deadlock.
	 */
	if ((is_truncate || !is_wb) &&
	    S_ISREG(inode->i_mode) && oldsize != outarg.attr.size) {
		truncate_pagecache(inode, outarg.attr.size);
		invalidate_inode_pages2(inode->i_mapping);
	}

	clear_bit(FUSE_I_SIZE_UNSTABLE, &fi->state);
	return 0;

error:
	if (is_truncate)
		fuse_release_nowrite(inode);

	clear_bit(FUSE_I_SIZE_UNSTABLE, &fi->state);
	return err;
}
Exemplo n.º 18
0
static int fuse_do_setattr(struct dentry *entry, struct iattr *attr,
                           struct file *file)
{
    struct inode *inode = entry->d_inode;
    struct fuse_conn *fc = get_fuse_conn(inode);
    struct fuse_inode *fi = get_fuse_inode(inode);
    struct fuse_req *req;
    struct fuse_setattr_in inarg;
    struct fuse_attr_out outarg;
    bool is_truncate = false;
    loff_t oldsize;
    int err;

    if (!fuse_allow_task(fc, current))
        return -EACCES;

    if (!(fc->flags & FUSE_DEFAULT_PERMISSIONS))
        attr->ia_valid |= ATTR_FORCE;

    err = inode_change_ok(inode, attr);
    if (err)
        return err;

    if (attr->ia_valid & ATTR_OPEN) {
        if (fc->atomic_o_trunc)
            return 0;
        file = NULL;
    }

    if (attr->ia_valid & ATTR_SIZE)
        is_truncate = true;

    req = fuse_get_req(fc);
    if (IS_ERR(req))
        return PTR_ERR(req);

    if (is_truncate) {
        fuse_set_nowrite(inode);
        set_bit(FUSE_I_SIZE_UNSTABLE, &fi->state);
    }

    memset(&inarg, 0, sizeof(inarg));
    memset(&outarg, 0, sizeof(outarg));
    iattr_to_fattr(attr, &inarg);
    if (file) {
        struct fuse_file *ff = file->private_data;
        inarg.valid |= FATTR_FH;
        inarg.fh = ff->fh;
    }
    if (attr->ia_valid & ATTR_SIZE) {

        inarg.valid |= FATTR_LOCKOWNER;
        inarg.lock_owner = fuse_lock_owner_id(fc, current->files);
    }
    req->in.h.opcode = FUSE_SETATTR;
    req->in.h.nodeid = get_node_id(inode);
    req->in.numargs = 1;
    req->in.args[0].size = sizeof(inarg);
    req->in.args[0].value = &inarg;
    req->out.numargs = 1;
    if (fc->minor < 9)
        req->out.args[0].size = FUSE_COMPAT_ATTR_OUT_SIZE;
    else
        req->out.args[0].size = sizeof(outarg);
    req->out.args[0].value = &outarg;
    fuse_request_send(fc, req);
    err = req->out.h.error;
    fuse_put_request(fc, req);
    if (err) {
        if (err == -EINTR)
            fuse_invalidate_attr(inode);
        goto error;
    }

    if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) {
        make_bad_inode(inode);
        err = -EIO;
        goto error;
    }

    spin_lock(&fc->lock);
    fuse_change_attributes_common(inode, &outarg.attr,
                                  attr_timeout(&outarg));
    oldsize = inode->i_size;
    i_size_write(inode, outarg.attr.size);

    if (is_truncate) {

        __fuse_release_nowrite(inode);
    }
    spin_unlock(&fc->lock);

    if (S_ISREG(inode->i_mode) && oldsize != outarg.attr.size) {
        truncate_pagecache(inode, oldsize, outarg.attr.size);
        invalidate_inode_pages2(inode->i_mapping);
    }

    clear_bit(FUSE_I_SIZE_UNSTABLE, &fi->state);
    return 0;

error:
    if (is_truncate)
        fuse_release_nowrite(inode);

    clear_bit(FUSE_I_SIZE_UNSTABLE, &fi->state);
    return err;
}
Exemplo n.º 19
0
static int f2fs_insert_range(struct inode *inode, loff_t offset, loff_t len)
{
	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
	pgoff_t pg_start, pg_end, delta, nrpages, idx;
	loff_t new_size;
	int ret;

	if (!S_ISREG(inode->i_mode))
		return -EINVAL;

	new_size = i_size_read(inode) + len;
	if (new_size > inode->i_sb->s_maxbytes)
		return -EFBIG;

	if (offset >= i_size_read(inode))
		return -EINVAL;

	/* insert range should be aligned to block size of f2fs. */
	if (offset & (F2FS_BLKSIZE - 1) || len & (F2FS_BLKSIZE - 1))
		return -EINVAL;

	f2fs_balance_fs(sbi);

	if (f2fs_has_inline_data(inode)) {
		ret = f2fs_convert_inline_inode(inode);
		if (ret)
			return ret;
	}

	ret = truncate_blocks(inode, i_size_read(inode), true);
	if (ret)
		return ret;

	/* write out all dirty pages from offset */
	ret = filemap_write_and_wait_range(inode->i_mapping, offset, LLONG_MAX);
	if (ret)
		return ret;

	truncate_pagecache(inode, 0, offset);

	pg_start = offset >> PAGE_CACHE_SHIFT;
	pg_end = (offset + len) >> PAGE_CACHE_SHIFT;
	delta = pg_end - pg_start;
	nrpages = (i_size_read(inode) + PAGE_SIZE - 1) / PAGE_SIZE;

	for (idx = nrpages - 1; idx >= pg_start && idx != -1; idx--) {
		struct dnode_of_data dn;
		struct page *ipage;
		block_t new_addr, old_addr;

		f2fs_lock_op(sbi);

		set_new_dnode(&dn, inode, NULL, NULL, 0);
		ret = get_dnode_of_data(&dn, idx, LOOKUP_NODE_RA);
		if (ret && ret != -ENOENT) {
			goto out;
		} else if (ret == -ENOENT) {
			goto next;
		} else if (dn.data_blkaddr == NULL_ADDR) {
			f2fs_put_dnode(&dn);
			goto next;
		} else {
			new_addr = dn.data_blkaddr;
			truncate_data_blocks_range(&dn, 1);
			f2fs_put_dnode(&dn);
		}

		ipage = get_node_page(sbi, inode->i_ino);
		if (IS_ERR(ipage)) {
			ret = PTR_ERR(ipage);
			goto out;
		}

		set_new_dnode(&dn, inode, ipage, NULL, 0);
		ret = f2fs_reserve_block(&dn, idx + delta);
		if (ret)
			goto out;

		old_addr = dn.data_blkaddr;
		f2fs_bug_on(sbi, old_addr != NEW_ADDR);

		if (new_addr != NEW_ADDR) {
			struct node_info ni;

			get_node_info(sbi, dn.nid, &ni);
			f2fs_replace_block(sbi, &dn, old_addr, new_addr,
							ni.version, true);
		}
		f2fs_put_dnode(&dn);
next:
		f2fs_unlock_op(sbi);
	}

	i_size_write(inode, new_size);
	return 0;
out:
	f2fs_unlock_op(sbi);
	return ret;
}
Exemplo n.º 20
0
/*
 * Set attributes, and at the same time refresh them.
 *
 * Truncation is slightly complicated, because the 'truncate' request
 * may fail, in which case we don't want to touch the mapping.
 * vmtruncate() doesn't allow for this case, so do the rlimit checking
 * and the actual truncation by hand.
 */
int fuse_do_setattr(struct inode *inode, struct iattr *attr,
		    struct file *file)
{
	struct fuse_conn *fc = get_fuse_conn(inode);
	struct fuse_inode *fi = get_fuse_inode(inode);
	struct fuse_req *req;
	struct fuse_setattr_in inarg;
	struct fuse_attr_out outarg;
	bool is_truncate = false;
	int is_wb = fc->writeback_cache;
	loff_t oldsize;
	int err;
	bool trust_local_mtime = is_wb && S_ISREG(inode->i_mode);

	if (fc->flags & FUSE_DEFAULT_PERMISSIONS) {
		err = inode_change_ok(inode, attr);
		if (err)
			return err;
	}

	if ((attr->ia_valid & ATTR_OPEN) && fc->atomic_o_trunc)
		return 0;

	if (attr->ia_valid & ATTR_SIZE) {
		err = inode_newsize_ok(inode, attr->ia_size);
		if (err)
			return err;
		is_truncate = true;
	}

	req = fuse_get_req_nopages(fc);
	if (IS_ERR(req))
		return PTR_ERR(req);

	if (is_truncate) {
		fuse_set_nowrite(inode);
		set_bit(FUSE_I_SIZE_UNSTABLE, &fi->state);
	}

	memset(&inarg, 0, sizeof(inarg));
	memset(&outarg, 0, sizeof(outarg));
	iattr_to_fattr(attr, &inarg, trust_local_mtime);
	if (file) {
		struct fuse_file *ff = file->private_data;
		inarg.valid |= FATTR_FH;
		inarg.fh = ff->fh;
	}
	if (attr->ia_valid & ATTR_SIZE) {
		/* For mandatory locking in truncate */
		inarg.valid |= FATTR_LOCKOWNER;
		inarg.lock_owner = fuse_lock_owner_id(fc, current->files);
	}
	fuse_setattr_fill(fc, req, inode, &inarg, &outarg);
	fuse_request_send(fc, req);
	err = req->out.h.error;
	fuse_put_request(fc, req);
	if (err) {
		if (err == -EINTR)
			fuse_invalidate_attr(inode);
		goto error;
	}

	if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) {
		make_bad_inode(inode);
		err = -EIO;
		goto error;
	}

	spin_lock(&fc->lock);
	/* the kernel maintains i_mtime locally */
	if (trust_local_mtime && (attr->ia_valid & ATTR_MTIME)) {
		inode->i_mtime = attr->ia_mtime;
		clear_bit(FUSE_I_MTIME_DIRTY, &fi->state);
	}

	fuse_change_attributes_common(inode, &outarg.attr,
				      attr_timeout(&outarg));
	oldsize = inode->i_size;
	if (!is_wb || is_truncate || !S_ISREG(inode->i_mode))
		i_size_write(inode, outarg.attr.size);

	if (is_truncate) {
		/* NOTE: this may release/reacquire fc->lock */
		__fuse_release_nowrite(inode);
	}
	spin_unlock(&fc->lock);

	/*
	 * Only call invalidate_inode_pages2() after removing
	 * FUSE_NOWRITE, otherwise fuse_launder_page() would deadlock.
	 */
	if ((is_truncate || !is_wb) &&
	    S_ISREG(inode->i_mode) && oldsize != outarg.attr.size) {
		truncate_pagecache(inode, oldsize, outarg.attr.size);
		invalidate_inode_pages2(inode->i_mapping);
	}

	clear_bit(FUSE_I_SIZE_UNSTABLE, &fi->state);
	return 0;

error:
	if (is_truncate)
		fuse_release_nowrite(inode);

	clear_bit(FUSE_I_SIZE_UNSTABLE, &fi->state);
	return err;
}
Exemplo n.º 21
0
static int sdcardfs_setattr(struct dentry *dentry, struct iattr *ia)
{
	int err = 0;
	struct dentry *lower_dentry;
	struct inode *inode;
	struct inode *lower_inode;
	struct path lower_path;
	struct iattr lower_ia;
	struct dentry *parent;

	inode = dentry->d_inode;

	/*
	 * Check if user has permission to change inode.  We don't check if
	 * this user can change the lower inode: that should happen when
	 * calling notify_change on the lower inode.
	 */
	err = inode_change_ok(inode, ia);

	/* no vfs_XXX operations required, cred overriding will be skipped. wj*/
	if (!err) {
		/* check the Android group ID */
		parent = dget_parent(dentry);
		if(!check_caller_access_to_name(parent->d_inode, dentry->d_name.name)) {
			printk(KERN_INFO "%s: need to check the caller's gid in packages.list\n" 
							 "  dentry: %s, task:%s\n",
							 __func__, dentry->d_name.name, current->comm);
			err = -EACCES;
		}
		dput(parent);
	} 

	if (err)
		goto out_err;

	sdcardfs_get_lower_path(dentry, &lower_path);
	lower_dentry = lower_path.dentry;
	lower_inode = sdcardfs_lower_inode(inode);

	/* prepare our own lower struct iattr (with the lower file) */
	memcpy(&lower_ia, ia, sizeof(lower_ia));
	if (ia->ia_valid & ATTR_FILE)
		lower_ia.ia_file = sdcardfs_lower_file(ia->ia_file);

	lower_ia.ia_valid &= ~(ATTR_UID | ATTR_GID | ATTR_MODE);

	/*
	 * If shrinking, first truncate upper level to cancel writing dirty
	 * pages beyond the new eof; and also if its' maxbytes is more
	 * limiting (fail with -EFBIG before making any change to the lower
	 * level).  There is no need to vmtruncate the upper level
	 * afterwards in the other cases: we fsstack_copy_inode_size from
	 * the lower level.
	 */
	if (ia->ia_valid & ATTR_SIZE) {
		loff_t oldsize;
		err = inode_newsize_ok(inode, ia->ia_size);
		if (err)
			goto out;
		/* This code from truncate_setsize(). We need to add spin_lock
		 * to avoid race condition with fsstack_copy_inode_size() */
		oldsize = i_size_read(inode);
		if (sizeof(ia->ia_size) > sizeof(long))
			spin_lock(&inode->i_lock);
		i_size_write(inode, ia->ia_size);
		if (sizeof(ia->ia_size) > sizeof(long))
			spin_unlock(&inode->i_lock);
		if (ia->ia_size > oldsize)
			pagecache_isize_extended(inode, oldsize, ia->ia_size);
		truncate_pagecache(inode, oldsize, ia->ia_size);
	}

	/*
	 * mode change is for clearing setuid/setgid bits. Allow lower fs
	 * to interpret this in its own way.
	 */
	if (lower_ia.ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
		lower_ia.ia_valid &= ~ATTR_MODE;

	/* notify the (possibly copied-up) lower inode */
	/*
	 * Note: we use lower_dentry->d_inode, because lower_inode may be
	 * unlinked (no inode->i_sb and i_ino==0.  This happens if someone
	 * tries to open(), unlink(), then ftruncate() a file.
	 */
	mutex_lock(&lower_dentry->d_inode->i_mutex);
	err = notify_change(lower_dentry, &lower_ia); /* note: lower_ia */
	mutex_unlock(&lower_dentry->d_inode->i_mutex);
	if (err)
		goto out;

	/* get attributes from the lower inode, i_mutex held */
	sdcardfs_copy_inode_attr(inode, lower_inode);
	/* update derived permission of the upper inode */
	fix_derived_permission(inode);

	/*
	 * Not running fsstack_copy_inode_size(inode, lower_inode), because
	 * VFS should update our inode size, and notify_change on
	 * lower_inode should update its size.
	 */

out:
	sdcardfs_put_lower_path(dentry, &lower_path);
out_err:
	return err;
}