Beispiel #1
0
static ssize_t ocfs2_file_splice_read(struct file *in,
				      loff_t *ppos,
				      struct pipe_inode_info *pipe,
				      size_t len,
				      unsigned int flags)
{
	int ret = 0;
	struct inode *inode = in->f_path.dentry->d_inode;

	mlog_entry("(0x%p, 0x%p, %u, '%.*s')\n", in, pipe,
		   (unsigned int)len,
		   in->f_path.dentry->d_name.len,
		   in->f_path.dentry->d_name.name);

	/*
	 * See the comment in ocfs2_file_aio_read()
	 */
	ret = ocfs2_meta_lock(inode, NULL, 0);
	if (ret < 0) {
		mlog_errno(ret);
		goto bail;
	}
	ocfs2_meta_unlock(inode, 0);

	ret = generic_file_splice_read(in, ppos, pipe, len, flags);

bail:
	mlog_exit(ret);
	return ret;
}
/*
 * NOTE: this should always be called with parent dir i_mutex taken.
 */
int ocfs2_find_files_on_disk(const char *name,
			     int namelen,
			     u64 *blkno,
			     struct inode *inode,
			     struct buffer_head **dirent_bh,
			     struct ocfs2_dir_entry **dirent)
{
	int status = -ENOENT;
	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);

	mlog_entry("(osb=%p, parent=%"MLFu64", name='%.*s', blkno=%p, "
		   "inode=%p)\n",
		   osb, OCFS2_I(inode)->ip_blkno, namelen, name, blkno, inode);

	*dirent_bh = ocfs2_find_entry(name, namelen, inode, dirent);
	if (!*dirent_bh || !*dirent) {
		status = -ENOENT;
		goto leave;
	}

	*blkno = le64_to_cpu((*dirent)->inode);

	status = 0;
leave:
	if (status < 0) {
		*dirent = NULL;
		if (*dirent_bh) {
			brelse(*dirent_bh);
			*dirent_bh = NULL;
		}
	}

	mlog_exit(status);
	return status;
}
Beispiel #3
0
int ocfs2_getattr(struct vfsmount *mnt,
		  struct dentry *dentry,
		  struct kstat *stat)
{
	struct inode *inode = dentry->d_inode;
	struct super_block *sb = dentry->d_inode->i_sb;
	struct ocfs2_super *osb = sb->s_fs_info;
	int err;

	mlog_entry_void();

	err = ocfs2_inode_revalidate(dentry);
	if (err) {
		if (err != -ENOENT)
			mlog_errno(err);
		goto bail;
	}

	generic_fillattr(inode, stat);

	/* We set the blksize from the cluster size for performance */
	stat->blksize = osb->s_clustersize;

bail:
	mlog_exit(err);

	return err;
}
Beispiel #4
0
static char *ocfs2_fast_symlink_getlink(struct inode *inode,
					struct buffer_head **bh)
{
	int status;
	char *link = NULL;
	struct ocfs2_dinode *fe;

	mlog_entry_void();

	status = ocfs2_read_block(OCFS2_SB(inode->i_sb),
				  OCFS2_I(inode)->ip_blkno,
				  bh,
				  OCFS2_BH_CACHED,
				  inode);
	if (status < 0) {
		mlog_errno(status);
		link = ERR_PTR(status);
		goto bail;
	}

	fe = (struct ocfs2_dinode *) (*bh)->b_data;
	link = (char *) fe->id2.i_symlink;
bail:
	mlog_exit(status);

	return link;
}
Beispiel #5
0
static int ocfs2_truncate_for_delete(struct ocfs2_super *osb,
				     struct inode *inode,
				     struct buffer_head *fe_bh)
{
	int status = 0;
	struct ocfs2_dinode *fe;
	handle_t *handle = NULL;

	mlog_entry_void();

	fe = (struct ocfs2_dinode *) fe_bh->b_data;

	/*
	 * This check will also skip truncate of inodes with inline
	 * data and fast symlinks.
	 */
	if (fe->i_clusters) {
		if (ocfs2_should_order_data(inode))
			ocfs2_begin_ordered_truncate(inode, 0);

		handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
		if (IS_ERR(handle)) {
			status = PTR_ERR(handle);
			handle = NULL;
			mlog_errno(status);
			goto out;
		}

		status = ocfs2_journal_access_di(handle, INODE_CACHE(inode),
						 fe_bh,
						 OCFS2_JOURNAL_ACCESS_WRITE);
		if (status < 0) {
			mlog_errno(status);
			goto out;
		}

		i_size_write(inode, 0);

		status = ocfs2_mark_inode_dirty(handle, inode, fe_bh);
		if (status < 0) {
			mlog_errno(status);
			goto out;
		}

		ocfs2_commit_trans(osb, handle);
		handle = NULL;

		status = ocfs2_commit_truncate(osb, inode, fe_bh);
		if (status < 0) {
			mlog_errno(status);
			goto out;
		}
	}

out:
	if (handle)
		ocfs2_commit_trans(osb, handle);
	mlog_exit(status);
	return status;
}
Beispiel #6
0
static int ocfs2_file_open(struct inode *inode, struct file *file)
{
	int status;
	int mode = file->f_flags;
	struct ocfs2_inode_info *oi = OCFS2_I(inode);

	mlog_entry("(0x%p, 0x%p, '%.*s')\n", inode, file,
		   file->f_path.dentry->d_name.len, file->f_path.dentry->d_name.name);

	spin_lock(&oi->ip_lock);

	/* Check that the inode hasn't been wiped from disk by another
	 * node. If it hasn't then we're safe as long as we hold the
	 * spin lock until our increment of open count. */
	if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_DELETED) {
		spin_unlock(&oi->ip_lock);

		status = -ENOENT;
		goto leave;
	}

	if (mode & O_DIRECT)
		oi->ip_flags |= OCFS2_INODE_OPEN_DIRECT;

	oi->ip_open_count++;
	spin_unlock(&oi->ip_lock);
	status = 0;
leave:
	mlog_exit(status);
	return status;
}
Beispiel #7
0
/*
 * initialize the new inode, but don't do anything that would cause
 * us to sleep.
 * return 0 on success, 1 on failure
 */
static int ocfs2_init_locked_inode(struct inode *inode, void *opaque)
{
	struct ocfs2_find_inode_args *args = opaque;
	static struct lock_class_key ocfs2_quota_ip_alloc_sem_key,
				     ocfs2_file_ip_alloc_sem_key;

	mlog_entry("inode = %p, opaque = %p\n", inode, opaque);

	inode->i_ino = args->fi_ino;
	OCFS2_I(inode)->ip_blkno = args->fi_blkno;
	if (args->fi_sysfile_type != 0)
		lockdep_set_class(&inode->i_mutex,
			&ocfs2_sysfile_lock_key[args->fi_sysfile_type]);
	if (args->fi_sysfile_type == USER_QUOTA_SYSTEM_INODE ||
	    args->fi_sysfile_type == GROUP_QUOTA_SYSTEM_INODE ||
	    args->fi_sysfile_type == LOCAL_USER_QUOTA_SYSTEM_INODE ||
	    args->fi_sysfile_type == LOCAL_GROUP_QUOTA_SYSTEM_INODE)
		lockdep_set_class(&OCFS2_I(inode)->ip_alloc_sem,
				  &ocfs2_quota_ip_alloc_sem_key);
	else
		lockdep_set_class(&OCFS2_I(inode)->ip_alloc_sem,
				  &ocfs2_file_ip_alloc_sem_key);

	mlog_exit(0);
	return 0;
}
Beispiel #8
0
static int ocfs2_readpage(struct file *file, struct page *page)
{
	struct inode *inode = page->mapping->host;
	loff_t start = (loff_t)page->index << PAGE_CACHE_SHIFT;
	int ret, unlock = 1;

	mlog_entry("(0x%p, %lu)\n", file, (page ? page->index : 0));

	ret = ocfs2_meta_lock_with_page(inode, NULL, 0, page);
	if (ret != 0) {
		if (ret == AOP_TRUNCATED_PAGE)
			unlock = 0;
		mlog_errno(ret);
		goto out;
	}

	if (down_read_trylock(&OCFS2_I(inode)->ip_alloc_sem) == 0) {
		ret = AOP_TRUNCATED_PAGE;
		goto out_meta_unlock;
	}

	/*
	 * i_size might have just been updated as we grabed the meta lock.  We
	 * might now be discovering a truncate that hit on another node.
	 * block_read_full_page->get_block freaks out if it is asked to read
	 * beyond the end of a file, so we check here.  Callers
	 * (generic_file_read, vm_ops->fault) are clever enough to check i_size
	 * and notice that the page they just read isn't needed.
	 *
	 * XXX sys_readahead() seems to get that wrong?
	 */
	if (start >= i_size_read(inode)) {
		zero_user_page(page, 0, PAGE_SIZE, KM_USER0);
		SetPageUptodate(page);
		ret = 0;
		goto out_alloc;
	}

	ret = ocfs2_data_lock_with_page(inode, 0, page);
	if (ret != 0) {
		if (ret == AOP_TRUNCATED_PAGE)
			unlock = 0;
		mlog_errno(ret);
		goto out_alloc;
	}

	ret = block_read_full_page(page, ocfs2_get_block);
	unlock = 0;

	ocfs2_data_unlock(inode, 0);
out_alloc:
	up_read(&OCFS2_I(inode)->ip_alloc_sem);
out_meta_unlock:
	ocfs2_meta_unlock(inode, 0);
out:
	if (unlock)
		unlock_page(page);
	mlog_exit(ret);
	return ret;
}
Beispiel #9
0
static int ocfs2_readlink(struct dentry *dentry,
			  char __user *buffer,
			  int buflen)
{
	int ret;
	char *link;
	struct buffer_head *bh = NULL;
	struct inode *inode = dentry->d_inode;

	mlog_entry_void();

	link = ocfs2_fast_symlink_getlink(inode, &bh);
	if (IS_ERR(link)) {
		ret = PTR_ERR(link);
		goto out;
	}

	/*
	 * Without vfsmount we can't update atime now,
	 * but we will update atime here ultimately.
	 */
	ret = vfs_readlink(dentry, buffer, buflen, link);

	brelse(bh);
out:
	mlog_exit(ret);
	return ret;
}
Beispiel #10
0
/*
 * NOTE: this should always be called with parent dir i_mutex taken.
 */
int ocfs2_find_files_on_disk(const char *name,
			     int namelen,
			     u64 *blkno,
			     struct inode *inode,
			     struct buffer_head **dirent_bh,
			     struct ocfs2_dir_entry **dirent)
{
	int status = -ENOENT;

	mlog_entry("(name=%.*s, blkno=%p, inode=%p, dirent_bh=%p, dirent=%p)\n",
		   namelen, name, blkno, inode, dirent_bh, dirent);

	*dirent_bh = ocfs2_find_entry(name, namelen, inode, dirent);
	if (!*dirent_bh || !*dirent) {
		status = -ENOENT;
		goto leave;
	}

	*blkno = le64_to_cpu((*dirent)->inode);

	status = 0;
leave:
	if (status < 0) {
		*dirent = NULL;
		if (*dirent_bh) {
			brelse(*dirent_bh);
			*dirent_bh = NULL;
		}
	}

	mlog_exit(status);
	return status;
}
Beispiel #11
0
int ocfs2_update_inode_atime(struct inode *inode,
			     struct buffer_head *bh)
{
	int ret;
	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
	handle_t *handle;

	mlog_entry_void();

	handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
	if (handle == NULL) {
		ret = -ENOMEM;
		mlog_errno(ret);
		goto out;
	}

	inode->i_atime = CURRENT_TIME;
	ret = ocfs2_mark_inode_dirty(handle, inode, bh);
	if (ret < 0)
		mlog_errno(ret);

	ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
out:
	mlog_exit(ret);
	return ret;
}
Beispiel #12
0
static int ocfs2_encode_fh(struct dentry *dentry, u32 *fh_in, int *max_len,
               int connectable)
{
    struct inode *inode = dentry->d_inode;
    int len = *max_len;
    int type = 1;
    u64 blkno;
    u32 generation;
    __le32 *fh = (__force __le32 *) fh_in;

    mlog_entry("(0x%p, '%.*s', 0x%p, %d, %d)\n", dentry,
           dentry->d_name.len, dentry->d_name.name,
           fh, len, connectable);

    if (len < 3 || (connectable && len < 6)) {
        mlog(ML_ERROR, "fh buffer is too small for encoding\n");
        type = 255;
        goto bail;
    }

    blkno = OCFS2_I(inode)->ip_blkno;
    generation = inode->i_generation;

    mlog(0, "Encoding fh: blkno: %llu, generation: %u\n",
         (unsigned long long)blkno, generation);

    len = 3;
    fh[0] = cpu_to_le32((u32)(blkno >> 32));
    fh[1] = cpu_to_le32((u32)(blkno & 0xffffffff));
    fh[2] = cpu_to_le32(generation);

    if (connectable && !S_ISDIR(inode->i_mode)) {
        struct inode *parent;

        spin_lock(&dentry->d_lock);

        parent = dentry->d_parent->d_inode;
        blkno = OCFS2_I(parent)->ip_blkno;
        generation = parent->i_generation;

        fh[3] = cpu_to_le32((u32)(blkno >> 32));
        fh[4] = cpu_to_le32((u32)(blkno & 0xffffffff));
        fh[5] = cpu_to_le32(generation);

        spin_unlock(&dentry->d_lock);

        len = 6;
        type = 2;

        mlog(0, "Encoding parent: blkno: %llu, generation: %u\n",
             (unsigned long long)blkno, generation);
    }
    
    *max_len = len;

bail:
    mlog_exit(type);
    return type;
}
Beispiel #13
0
int ocfs2_claim_local_alloc_bits(struct ocfs2_super *osb,
				 handle_t *handle,
				 struct ocfs2_alloc_context *ac,
				 u32 bits_wanted,
				 u32 *bit_off,
				 u32 *num_bits)
{
	int status, start;
	struct inode *local_alloc_inode;
	void *bitmap;
	struct ocfs2_dinode *alloc;
	struct ocfs2_local_alloc *la;

	mlog_entry_void();
	BUG_ON(ac->ac_which != OCFS2_AC_USE_LOCAL);

	local_alloc_inode = ac->ac_inode;
	alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data;
	la = OCFS2_LOCAL_ALLOC(alloc);

	start = ocfs2_local_alloc_find_clear_bits(osb, alloc, bits_wanted);
	if (start == -1) {
		/* TODO: Shouldn't we just BUG here? */
		status = -ENOSPC;
		mlog_errno(status);
		goto bail;
	}

	bitmap = la->la_bitmap;
	*bit_off = le32_to_cpu(la->la_bm_off) + start;
	/* local alloc is always contiguous by nature -- we never
	 * delete bits from it! */
	*num_bits = bits_wanted;

	status = ocfs2_journal_access_di(handle,
					 INODE_CACHE(local_alloc_inode),
					 osb->local_alloc_bh,
					 OCFS2_JOURNAL_ACCESS_WRITE);
	if (status < 0) {
		mlog_errno(status);
		goto bail;
	}

	while(bits_wanted--)
		ocfs2_set_bit(start++, bitmap);

	le32_add_cpu(&alloc->id1.bitmap1.i_used, *num_bits);

	status = ocfs2_journal_dirty(handle, osb->local_alloc_bh);
	if (status < 0) {
		mlog_errno(status);
		goto bail;
	}

	status = 0;
bail:
	mlog_exit(status);
	return status;
}
Beispiel #14
0
int ocfs2_journal_access(handle_t *handle,
			 struct inode *inode,
			 struct buffer_head *bh,
			 int type)
{
	int status;

	BUG_ON(!inode);
	BUG_ON(!handle);
	BUG_ON(!bh);

	mlog_entry("bh->b_blocknr=%llu, type=%d (\"%s\"), bh->b_size = %zu\n",
		   (unsigned long long)bh->b_blocknr, type,
		   (type == OCFS2_JOURNAL_ACCESS_CREATE) ?
		   "OCFS2_JOURNAL_ACCESS_CREATE" :
		   "OCFS2_JOURNAL_ACCESS_WRITE",
		   bh->b_size);

	/* we can safely remove this assertion after testing. */
	if (!buffer_uptodate(bh)) {
		mlog(ML_ERROR, "giving me a buffer that's not uptodate!\n");
		mlog(ML_ERROR, "b_blocknr=%llu\n",
		     (unsigned long long)bh->b_blocknr);
		BUG();
	}

	/* Set the current transaction information on the inode so
	 * that the locking code knows whether it can drop it's locks
	 * on this inode or not. We're protected from the commit
	 * thread updating the current transaction id until
	 * ocfs2_commit_trans() because ocfs2_start_trans() took
	 * j_trans_barrier for us. */
	ocfs2_set_inode_lock_trans(OCFS2_SB(inode->i_sb)->journal, inode);

	mutex_lock(&OCFS2_I(inode)->ip_io_mutex);
	switch (type) {
	case OCFS2_JOURNAL_ACCESS_CREATE:
	case OCFS2_JOURNAL_ACCESS_WRITE:
		status = journal_get_write_access(handle, bh);
		break;

	case OCFS2_JOURNAL_ACCESS_UNDO:
		status = journal_get_undo_access(handle, bh);
		break;

	default:
		status = -EINVAL;
		mlog(ML_ERROR, "Uknown access type!\n");
	}
	mutex_unlock(&OCFS2_I(inode)->ip_io_mutex);

	if (status < 0)
		mlog(ML_ERROR, "Error %d getting %d access to buffer!\n",
		     status, type);

	mlog_exit(status);
	return status;
}
static int ocfs2_local_alloc_find_clear_bits(struct ocfs2_super *osb,
					     struct ocfs2_dinode *alloc,
					     u32 numbits)
{
	int numfound, bitoff, left, startoff, lastzero;
	void *bitmap = NULL;

	mlog_entry("(numbits wanted = %u)\n", numbits);

	if (!alloc->id1.bitmap1.i_total) {
		mlog(0, "No bits in my window!\n");
		bitoff = -1;
		goto bail;
	}

	bitmap = OCFS2_LOCAL_ALLOC(alloc)->la_bitmap;

	numfound = bitoff = startoff = 0;
	lastzero = -1;
	left = le32_to_cpu(alloc->id1.bitmap1.i_total);
	while ((bitoff = ocfs2_find_next_zero_bit(bitmap, left, startoff)) != -1) {
		if (bitoff == left) {
			/* mlog(0, "bitoff (%d) == left", bitoff); */
			break;
		}
		/* mlog(0, "Found a zero: bitoff = %d, startoff = %d, "
		   "numfound = %d\n", bitoff, startoff, numfound);*/

		/* Ok, we found a zero bit... is it contig. or do we
		 * start over?*/
		if (bitoff == startoff) {
			/* we found a zero */
			numfound++;
			startoff++;
		} else {
			/* got a zero after some ones */
			numfound = 1;
			startoff = bitoff+1;
		}
		/* we got everything we needed */
		if (numfound == numbits) {
			/* mlog(0, "Found it all!\n"); */
			break;
		}
	}

	mlog(0, "Exiting loop, bitoff = %d, numfound = %d\n", bitoff,
	     numfound);

	if (numfound == numbits)
		bitoff = startoff - numfound;
	else
		bitoff = -1;

bail:
	mlog_exit(bitoff);
	return bitoff;
}
Beispiel #16
0
static int ocfs2_block_group_fill(handle_t *handle,
				  struct inode *alloc_inode,
				  struct buffer_head *bg_bh,
				  u64 group_blkno,
				  u16 my_chain,
				  struct ocfs2_chain_list *cl)
{
	int status = 0;
	struct ocfs2_group_desc *bg = (struct ocfs2_group_desc *) bg_bh->b_data;
	struct super_block * sb = alloc_inode->i_sb;

	mlog_entry_void();

	if (((unsigned long long) bg_bh->b_blocknr) != group_blkno) {
		ocfs2_error(alloc_inode->i_sb, "group block (%llu) != "
			    "b_blocknr (%llu)",
			    (unsigned long long)group_blkno,
			    (unsigned long long) bg_bh->b_blocknr);
		status = -EIO;
		goto bail;
	}

	status = ocfs2_journal_access(handle,
				      alloc_inode,
				      bg_bh,
				      OCFS2_JOURNAL_ACCESS_CREATE);
	if (status < 0) {
		mlog_errno(status);
		goto bail;
	}

	memset(bg, 0, sb->s_blocksize);
	strcpy(bg->bg_signature, OCFS2_GROUP_DESC_SIGNATURE);
	bg->bg_generation = cpu_to_le32(OCFS2_SB(sb)->fs_generation);
	bg->bg_size = cpu_to_le16(ocfs2_group_bitmap_size(sb));
	bg->bg_bits = cpu_to_le16(ocfs2_bits_per_group(cl));
	bg->bg_chain = cpu_to_le16(my_chain);
	bg->bg_next_group = cl->cl_recs[my_chain].c_blkno;
	bg->bg_parent_dinode = cpu_to_le64(OCFS2_I(alloc_inode)->ip_blkno);
	bg->bg_blkno = cpu_to_le64(group_blkno);
	/* set the 1st bit in the bitmap to account for the descriptor block */
	ocfs2_set_bit(0, (unsigned long *)bg->bg_bitmap);
	bg->bg_free_bits_count = cpu_to_le16(le16_to_cpu(bg->bg_bits) - 1);

	status = ocfs2_journal_dirty(handle, bg_bh);
	if (status < 0)
		mlog_errno(status);

	/* There is no need to zero out or otherwise initialize the
	 * other blocks in a group - All valid FS metadata in a block
	 * group stores the superblock fs_generation value at
	 * allocation time. */

bail:
	mlog_exit(status);
	return status;
}
Beispiel #17
0
static int ocfs2_orphan_for_truncate(struct ocfs2_super *osb,
				     struct inode *inode,
				     struct buffer_head *fe_bh,
				     u64 new_i_size)
{
	int status;
	handle_t *handle;
	struct ocfs2_dinode *di;

	mlog_entry_void();

	/* TODO: This needs to actually orphan the inode in this
	 * transaction. */

	handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
	if (IS_ERR(handle)) {
		status = PTR_ERR(handle);
		mlog_errno(status);
		goto out;
	}

	status = ocfs2_journal_access(handle, inode, fe_bh,
				      OCFS2_JOURNAL_ACCESS_WRITE);
	if (status < 0) {
		mlog_errno(status);
		goto out_commit;
	}

	/*
	 * Do this before setting i_size.
	 */
	status = ocfs2_zero_tail_for_truncate(inode, handle, new_i_size);
	if (status) {
		mlog_errno(status);
		goto out_commit;
	}

	i_size_write(inode, new_i_size);
	inode->i_blocks = ocfs2_align_bytes_to_sectors(new_i_size);
	inode->i_ctime = inode->i_mtime = CURRENT_TIME;

	di = (struct ocfs2_dinode *) fe_bh->b_data;
	di->i_size = cpu_to_le64(new_i_size);
	di->i_ctime = di->i_mtime = cpu_to_le64(inode->i_ctime.tv_sec);
	di->i_ctime_nsec = di->i_mtime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);

	status = ocfs2_journal_dirty(handle, fe_bh);
	if (status < 0)
		mlog_errno(status);

out_commit:
	ocfs2_commit_trans(osb, handle);
out:

	mlog_exit(status);
	return status;
}
Beispiel #18
0
/* Callers don't need to care which bitmap (local alloc or main) to
 * use so we figure it out for them, but unfortunately this clutters
 * things a bit. */
int ocfs2_reserve_clusters(struct ocfs2_super *osb,
			   u32 bits_wanted,
			   struct ocfs2_alloc_context **ac)
{
	int status;

	mlog_entry_void();

	*ac = kzalloc(sizeof(struct ocfs2_alloc_context), GFP_KERNEL);
	if (!(*ac)) {
		status = -ENOMEM;
		mlog_errno(status);
		goto bail;
	}

	(*ac)->ac_bits_wanted = bits_wanted;

	status = -ENOSPC;
	if (ocfs2_alloc_should_use_local(osb, bits_wanted)) {
		status = ocfs2_reserve_local_alloc_bits(osb,
							bits_wanted,
							*ac);
		if ((status < 0) && (status != -ENOSPC)) {
			mlog_errno(status);
			goto bail;
		} else if (status == -ENOSPC) {
			/* reserve_local_bits will return enospc with
			 * the local alloc inode still locked, so we
			 * can change this safely here. */
			mlog(0, "Disabling local alloc\n");
			/* We set to OCFS2_LA_DISABLED so that umount
			 * can clean up what's left of the local
			 * allocation */
			osb->local_alloc_state = OCFS2_LA_DISABLED;
		}
	}

	if (status == -ENOSPC) {
		status = ocfs2_reserve_cluster_bitmap_bits(osb, *ac);
		if (status < 0) {
			if (status != -ENOSPC)
				mlog_errno(status);
			goto bail;
		}
	}

	status = 0;
bail:
	if ((status < 0) && *ac) {
		ocfs2_free_alloc_context(*ac);
		*ac = NULL;
	}

	mlog_exit(status);
	return status;
}
Beispiel #19
0
/* Callers don't need to care which bitmap (local alloc or main) to
 * use so we figure it out for them, but unfortunately this clutters
 * things a bit. */
static int ocfs2_reserve_clusters_with_limit(struct ocfs2_super *osb,
					     u32 bits_wanted, u64 max_block,
					     int flags,
					     struct ocfs2_alloc_context **ac)
{
	int status;

	mlog_entry_void();

	*ac = kzalloc(sizeof(struct ocfs2_alloc_context), GFP_KERNEL);
	if (!(*ac)) {
		status = -ENOMEM;
		mlog_errno(status);
		goto bail;
	}

	(*ac)->ac_bits_wanted = bits_wanted;
	(*ac)->ac_max_block = max_block;

	status = -ENOSPC;
	if (!(flags & ALLOC_GROUPS_FROM_GLOBAL) &&
	    ocfs2_alloc_should_use_local(osb, bits_wanted)) {
		status = ocfs2_reserve_local_alloc_bits(osb,
							bits_wanted,
							*ac);
		if (status == -EFBIG) {
			/* The local alloc window is outside ac_max_block.
			 * use the main bitmap. */
			status = -ENOSPC;
		} else if ((status < 0) && (status != -ENOSPC)) {
			mlog_errno(status);
			goto bail;
		}
	}

	if (status == -ENOSPC) {
		status = ocfs2_reserve_cluster_bitmap_bits(osb, *ac);
		if (status < 0) {
			if (status != -ENOSPC)
				mlog_errno(status);
			goto bail;
		}
	}

	status = 0;
bail:
	if ((status < 0) && *ac) {
		ocfs2_free_alloc_context(*ac);
		*ac = NULL;
	}

	mlog_exit(status);
	return status;
}
Beispiel #20
0
/* Note: Because we don't support holes, our allocation has
 * already happened (allocation writes zeros to the file data)
 * so we don't have to worry about ordered writes in
 * ocfs2_writepage.
 *
 * ->writepage is called during the process of invalidating the page cache
 * during blocked lock processing.  It can't block on any cluster locks
 * to during block mapping.  It's relying on the fact that the block
 * mapping can't have disappeared under the dirty pages that it is
 * being asked to write back.
 */
static int ocfs2_writepage(struct page *page, struct writeback_control *wbc)
{
	int ret;

	mlog_entry("(0x%p)\n", page);

	ret = block_write_full_page(page, ocfs2_get_block, wbc);

	mlog_exit(ret);

	return ret;
}
Beispiel #21
0
/*
 * initialize the new inode, but don't do anything that would cause
 * us to sleep.
 * return 0 on success, 1 on failure
 */
static int ocfs2_init_locked_inode(struct inode *inode, void *opaque)
{
	struct ocfs2_find_inode_args *args = opaque;

	mlog_entry("inode = %p, opaque = %p\n", inode, opaque);

	inode->i_ino = args->fi_ino;
	OCFS2_I(inode)->ip_blkno = args->fi_blkno;

	mlog_exit(0);
	return 0;
}
Beispiel #22
0
static inline int ocfs2_block_group_set_bits(handle_t *handle,
					     struct inode *alloc_inode,
					     struct ocfs2_group_desc *bg,
					     struct buffer_head *group_bh,
					     unsigned int bit_off,
					     unsigned int num_bits)
{
	int status;
	void *bitmap = bg->bg_bitmap;
	int journal_type = OCFS2_JOURNAL_ACCESS_WRITE;

	mlog_entry_void();

	if (!OCFS2_IS_VALID_GROUP_DESC(bg)) {
		OCFS2_RO_ON_INVALID_GROUP_DESC(alloc_inode->i_sb, bg);
		status = -EIO;
		goto bail;
	}
	BUG_ON(le16_to_cpu(bg->bg_free_bits_count) < num_bits);

	mlog(0, "block_group_set_bits: off = %u, num = %u\n", bit_off,
	     num_bits);

	if (ocfs2_is_cluster_bitmap(alloc_inode))
		journal_type = OCFS2_JOURNAL_ACCESS_UNDO;

	status = ocfs2_journal_access(handle,
				      alloc_inode,
				      group_bh,
				      journal_type);
	if (status < 0) {
		mlog_errno(status);
		goto bail;
	}

	le16_add_cpu(&bg->bg_free_bits_count, -num_bits);

	while(num_bits--)
		ocfs2_set_bit(bit_off++, bitmap);

	status = ocfs2_journal_dirty(handle,
				     group_bh);
	if (status < 0) {
		mlog_errno(status);
		goto bail;
	}

bail:
	mlog_exit(status);
	return status;
}
/*
 * pass it the bitmap lock in lock_bh if you have it.
 */
static int ocfs2_local_alloc_new_window(struct ocfs2_super *osb,
					struct ocfs2_journal_handle *handle,
					struct ocfs2_alloc_context *ac)
{
	int status = 0;
	u32 cluster_off, cluster_count;
	struct ocfs2_dinode *alloc = NULL;
	struct ocfs2_local_alloc *la;

	mlog_entry_void();

	alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data;
	la = OCFS2_LOCAL_ALLOC(alloc);

	if (alloc->id1.bitmap1.i_total)
		mlog(0, "asking me to alloc a new window over a non-empty "
		     "one\n");

	mlog(0, "Allocating %u clusters for a new window.\n",
	     ocfs2_local_alloc_window_bits(osb));
	/* we used the generic suballoc reserve function, but we set
	 * everything up nicely, so there's no reason why we can't use
	 * the more specific cluster api to claim bits. */
	status = ocfs2_claim_clusters(osb, handle, ac,
				      ocfs2_local_alloc_window_bits(osb),
				      &cluster_off, &cluster_count);
	if (status < 0) {
		if (status != -ENOSPC)
			mlog_errno(status);
		goto bail;
	}

	la->la_bm_off = cpu_to_le32(cluster_off);
	alloc->id1.bitmap1.i_total = cpu_to_le32(cluster_count);
	/* just in case... In the future when we find space ourselves,
	 * we don't have to get all contiguous -- but we'll have to
	 * set all previously used bits in bitmap and update
	 * la_bits_set before setting the bits in the main bitmap. */
	alloc->id1.bitmap1.i_used = 0;
	memset(OCFS2_LOCAL_ALLOC(alloc)->la_bitmap, 0,
	       le16_to_cpu(la->la_size));

	mlog(0, "New window allocated:\n");
	mlog(0, "window la_bm_off = %u\n",
	     OCFS2_LOCAL_ALLOC(alloc)->la_bm_off);
	mlog(0, "window bits = %u\n", le32_to_cpu(alloc->id1.bitmap1.i_total));

bail:
	mlog_exit(status);
	return status;
}
Beispiel #24
0
static int ocfs2_write_remove_suid(struct inode *inode)
{
	int ret;
	struct buffer_head *bh = NULL;
	struct ocfs2_inode_info *oi = OCFS2_I(inode);
	handle_t *handle;
	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
	struct ocfs2_dinode *di;

	mlog_entry("(Inode %llu, mode 0%o)\n",
		   (unsigned long long)oi->ip_blkno, inode->i_mode);

	handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
	if (handle == NULL) {
		ret = -ENOMEM;
		mlog_errno(ret);
		goto out;
	}

	ret = ocfs2_read_block(osb, oi->ip_blkno, &bh, OCFS2_BH_CACHED, inode);
	if (ret < 0) {
		mlog_errno(ret);
		goto out_trans;
	}

	ret = ocfs2_journal_access(handle, inode, bh,
				   OCFS2_JOURNAL_ACCESS_WRITE);
	if (ret < 0) {
		mlog_errno(ret);
		goto out_bh;
	}

	inode->i_mode &= ~S_ISUID;
	if ((inode->i_mode & S_ISGID) && (inode->i_mode & S_IXGRP))
		inode->i_mode &= ~S_ISGID;

	di = (struct ocfs2_dinode *) bh->b_data;
	di->i_mode = cpu_to_le16(inode->i_mode);

	ret = ocfs2_journal_dirty(handle, bh);
	if (ret < 0)
		mlog_errno(ret);
out_bh:
	brelse(bh);
out_trans:
	ocfs2_commit_trans(osb, handle);
out:
	mlog_exit(ret);
	return ret;
}
Beispiel #25
0
/*
 * JBD Might read a cached version of another nodes journal file. We
 * don't want this as this file changes often and we get no
 * notification on those changes. The only way to be sure that we've
 * got the most up to date version of those blocks then is to force
 * read them off disk. Just searching through the buffer cache won't
 * work as there may be pages backing this file which are still marked
 * up to date. We know things can't change on this file underneath us
 * as we have the lock by now :)
 */
static int ocfs2_force_read_journal(struct inode *inode)
{
	int status = 0;
	int i;
	u64 v_blkno, p_blkno, p_blocks, num_blocks;
#define CONCURRENT_JOURNAL_FILL 32ULL
	struct buffer_head *bhs[CONCURRENT_JOURNAL_FILL];

	mlog_entry_void();

	memset(bhs, 0, sizeof(struct buffer_head *) * CONCURRENT_JOURNAL_FILL);

	num_blocks = ocfs2_blocks_for_bytes(inode->i_sb, inode->i_size);
	v_blkno = 0;
	while (v_blkno < num_blocks) {
		status = ocfs2_extent_map_get_blocks(inode, v_blkno,
						     &p_blkno, &p_blocks, NULL);
		if (status < 0) {
			mlog_errno(status);
			goto bail;
		}

		if (p_blocks > CONCURRENT_JOURNAL_FILL)
			p_blocks = CONCURRENT_JOURNAL_FILL;

		/* We are reading journal data which should not
		 * be put in the uptodate cache */
		status = ocfs2_read_blocks(OCFS2_SB(inode->i_sb),
					   p_blkno, p_blocks, bhs, 0,
					   NULL);
		if (status < 0) {
			mlog_errno(status);
			goto bail;
		}

		for(i = 0; i < p_blocks; i++) {
			brelse(bhs[i]);
			bhs[i] = NULL;
		}

		v_blkno += p_blocks;
	}

bail:
	for(i = 0; i < CONCURRENT_JOURNAL_FILL; i++)
		if (bhs[i])
			brelse(bhs[i]);
	mlog_exit(status);
	return status;
}
Beispiel #26
0
static inline int ocfs2_block_group_set_bits(handle_t *handle,
					     struct inode *alloc_inode,
					     struct ocfs2_group_desc *bg,
					     struct buffer_head *group_bh,
					     unsigned int bit_off,
					     unsigned int num_bits)
{
	int status;
	void *bitmap = bg->bg_bitmap;
	int journal_type = OCFS2_JOURNAL_ACCESS_WRITE;

	mlog_entry_void();

	/* All callers get the descriptor via
	 * ocfs2_read_group_descriptor().  Any corruption is a code bug. */
	BUG_ON(!OCFS2_IS_VALID_GROUP_DESC(bg));
	BUG_ON(le16_to_cpu(bg->bg_free_bits_count) < num_bits);

	mlog(0, "block_group_set_bits: off = %u, num = %u\n", bit_off,
	     num_bits);

	if (ocfs2_is_cluster_bitmap(alloc_inode))
		journal_type = OCFS2_JOURNAL_ACCESS_UNDO;

	status = ocfs2_journal_access_gd(handle,
					 INODE_CACHE(alloc_inode),
					 group_bh,
					 journal_type);
	if (status < 0) {
		mlog_errno(status);
		goto bail;
	}

	le16_add_cpu(&bg->bg_free_bits_count, -num_bits);

	while(num_bits--)
		ocfs2_set_bit(bit_off++, bitmap);

	status = ocfs2_journal_dirty(handle,
				     group_bh);
	if (status < 0) {
		mlog_errno(status);
		goto bail;
	}

bail:
	mlog_exit(status);
	return status;
}
Beispiel #27
0
/*
 * initialize the new inode, but don't do anything that would cause
 * us to sleep.
 * return 0 on success, 1 on failure
 */
static int ocfs2_init_locked_inode(struct inode *inode, void *opaque)
{
	struct ocfs2_find_inode_args *args = opaque;

	mlog_entry("inode = %p, opaque = %p\n", inode, opaque);

	inode->i_ino = args->fi_ino;
	OCFS2_I(inode)->ip_blkno = args->fi_blkno;
	if (args->fi_sysfile_type != 0)
		lockdep_set_class(&inode->i_mutex,
			&ocfs2_sysfile_lock_key[args->fi_sysfile_type]);

	mlog_exit(0);
	return 0;
}
Beispiel #28
0
int ocfs2_write_block(struct ocfs2_super *osb, struct buffer_head *bh,
		      struct inode *inode)
{
	int ret = 0;

	mlog_entry("(bh->b_blocknr = %llu, inode=%p)\n",
		   (unsigned long long)bh->b_blocknr, inode);

	BUG_ON(bh->b_blocknr < OCFS2_SUPER_BLOCK_BLKNO);
	BUG_ON(buffer_jbd(bh));

	/* No need to check for a soft readonly file system here. non
	 * journalled writes are only ever done on system files which
	 * can get modified during recovery even if read-only. */
	if (ocfs2_is_hard_readonly(osb)) {
		ret = -EROFS;
		goto out;
	}

	mutex_lock(&OCFS2_I(inode)->ip_io_mutex);

	lock_buffer(bh);
	set_buffer_uptodate(bh);

	/* remove from dirty list before I/O. */
	clear_buffer_dirty(bh);

	get_bh(bh); /* for end_buffer_write_sync() */
	bh->b_end_io = end_buffer_write_sync;
	submit_bh(WRITE, bh);

	wait_on_buffer(bh);

	if (buffer_uptodate(bh)) {
		ocfs2_set_buffer_uptodate(inode, bh);
	} else {
		/* We don't need to remove the clustered uptodate
		 * information for this bh as it's not marked locally
		 * uptodate. */
		ret = -EIO;
		put_bh(bh);
	}

	mutex_unlock(&OCFS2_I(inode)->ip_io_mutex);
out:
	mlog_exit(ret);
	return ret;
}
Beispiel #29
0
static int ocfs2_get_inode_attr(struct inode *inode, unsigned *flags)
{
	int status;

	status = ocfs2_inode_lock(inode, NULL, 0);
	if (status < 0) {
		mlog_errno(status);
		return status;
	}
	ocfs2_get_inode_flags(OCFS2_I(inode));
	*flags = OCFS2_I(inode)->ip_attr;
	ocfs2_inode_unlock(inode, 0);

	mlog_exit(status);
	return status;
}
static u32 ocfs2_local_alloc_count_bits(struct ocfs2_dinode *alloc)
{
	int i;
	u8 *buffer;
	u32 count = 0;
	struct ocfs2_local_alloc *la = OCFS2_LOCAL_ALLOC(alloc);

	mlog_entry_void();

	buffer = la->la_bitmap;
	for (i = 0; i < le16_to_cpu(la->la_size); i++)
		count += hweight8(buffer[i]);

	mlog_exit(count);
	return count;
}